style(library): rustfmt the cover-fetch helpers

CI `cargo fmt --all --check` flagged fetch_image's base64/header chains (added in
12c7ec9 — clippy was run, fmt --check was missed). Pure formatting, no logic change.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.cargo/audit.toml

@@ -5,16 +5,33 @@
 # means the audit job stops flagging it, so the reasoning must hold up.
 #
 # NOTE: `cargo audit` (no `--deny warnings`) fails only on *vulnerabilities*, not on the
-# `unmaintained` warnings (audiopus_sys / paste / rustls-pemfile). Those are left visible on purpose
+# `unmaintained` warnings (audiopus_sys via opus, paste via utoipa-axum). Both are transitive, at
-# so we keep getting the maintenance signal — they do not fail CI.
+# their latest published version with no successor, so there's nothing to bump — left visible on
+# purpose so we keep getting the maintenance signal; they do not fail CI. (rustls-pemfile was dropped
+# 2026-06-29 by removing axum-server's unused tls-rustls feature + moving our own PEM parsing to
+# rustls-pki-types; memmap2's unsoundness was fixed by the 0.9.11 bump.)
 
 [advisories]
 ignore = [
-    # rsa "Marvin Attack" — a timing sidechannel in RSA *decryption* (PKCS#1 v1.5 padding oracle).
+    # rsa "Marvin Attack" (RUSTSEC-2023-0071): a timing side-channel in the rsa crate's variable-time
-    # There is NO fixed rsa release (the constant-time rewrite is still unreleased upstream), and rsa
+    # modular exponentiation of the SECRET exponent. IMPORTANT — this affects the RSA private-key op in
-    # is required for GameStream/Moonlight pairing. Crucially, the host uses rsa ONLY for PKCS#1 v1.5
+    # general, INCLUDING signing (m^d mod n), which the host DOES perform (gamestream/pairing.rs
-    # SIGNING / VERIFYING (gamestream/cert.rs + gamestream/pairing.rs: SigningKey / VerifyingKey /
+    # `signing_key.sign(&serversecret)`). It is NOT, as an earlier version of this note wrongly claimed,
-    # Signer / Verifier) — it never performs RSA decryption, which is the operation Marvin targets.
+    # limited to decryption — so "the vulnerable path isn't exercised" is false; signing exercises it.
-    # So the vulnerable code path is not exercised. Revisit if a fixed rsa ships or we add RSA decrypt.
+    # We accept it because the attack is not practically reachable here, NOT because the path is unused:
+    #   * No RSA decryption / PKCS#1v1.5 padding oracle exists anywhere (every `decrypt` in the tree is
+    #     AES/AES-GCM), so the classic Bleichenbacher/Marvin chosen-ciphertext oracle is absent.
+    #   * The only signed message (`serversecret`) is HOST-generated random, never attacker-chosen — so
+    #     there's no adaptive chosen-input probing (the lever remote RSA-timing key recovery needs); and
+    #     signing is gated behind the operator-entered pairing PIN, ONE signature per ceremony (a
+    #     repeated phase-3 is rejected — gamestream/pairing.rs — to deny a passive timing-sample harvester).
+    #   * GameStream is OFF by default (bare `serve` is native-only); the secure native QUIC plane uses
+    #     rustls' constant-time backend, NOT the rsa crate. RSA is touched only on the opt-in,
+    #     trusted-LAN GameStream/Moonlight pairing handshake. Moonlight mandates RSA-2048, so the
+    #     GameStream identity cannot move to Ed25519/ECDSA (only the native identity could, and it
+    #     already avoids the rsa crate).
+    # There is NO fixed rsa release (the constant-time rewrite is still unreleased upstream). Revisit if:
+    # a constant-time rsa ships (then drop this), the host ever signs an attacker-chosen message with
+    # this key, or any RSA decryption / key-transport using the private key is added.
     "RUSTSEC-2023-0071",
 ]

.gitea/workflows/release.yml

@@ -207,10 +207,20 @@ jobs:
         # (Config/Punktfunk-macOS.entitlements) — mandatory for the Mac App Store.
         continue-on-error: true
         run: |
-          # Separate archive from the Developer ID one above: App Store needs a profile-signed
+          # Separate archive from the Developer ID one above: App Store needs a signed, entitled
-          # archive (manual signing), not the unsigned-then-codesign DMG path. Same App-Manager
+          # archive that -exportArchive can re-sign for distribution, not the unsigned-then-codesign
-          # ASC-key constraint as iOS/tvOS — MANUAL signing, NOT -allowProvisioningUpdates
+          # DMG path. Archive with AUTOMATIC signing (development). Why not a manually-specified
-          # (cloud signing the key can't do). Quit Xcode so it can't prune the dropped profile.
+          # profile (as this step used to do): the in-app license screens added a SwiftPM resource
+          # bundle (PunktfunkKit_PunktfunkKit), and a resource bundle is a product type that cannot
+          # carry a provisioning profile — a global PROVISIONING_PROFILE_SPECIFIER (here) or an
+          # sdk-scoped one (iOS/tvOS) lands on it and fails the archive ("does not support
+          # provisioning profiles"). Automatic signing assigns a profile only to the app and leaves
+          # the resource bundle (and the macOS-host macro plugins) alone, and bakes the sandbox
+          # entitlements in. No -allowProvisioningUpdates → it stays OFFLINE and never cloud-signs
+          # (the App-Manager ASC key can't), so the runner must have a macOS *development* profile
+          # for io.unom.punktfunk installed. DISTRIBUTION signing happens in the export step below
+          # (manual, via the plist). Quit Xcode so it can't prune the manually-installed App Store
+          # distribution profile that export needs.
           osascript -e 'tell application "Xcode" to quit' >/dev/null 2>&1 || true
           pkill -x Xcode 2>/dev/null || true
           PROFILE="Punktfunk macOS App Store Distribution"
@@ -218,11 +228,10 @@ jobs:
             -project "$PROJECT" -scheme Punktfunk \
             -destination 'generic/platform=macOS' \
             -archivePath "$RUNNER_TEMP/Punktfunk-macos-appstore.xcarchive" \
+            -skipMacroValidation -skipPackagePluginValidation \
             MARKETING_VERSION="$VERSION" CURRENT_PROJECT_VERSION="$BUILD_NUM" \
-            CODE_SIGN_STYLE=Manual \
+            CODE_SIGN_STYLE=Automatic \
-            CODE_SIGN_IDENTITY="Apple Distribution" \
+            DEVELOPMENT_TEAM="$TEAM_ID"
-            DEVELOPMENT_TEAM="$TEAM_ID" \
-            PROVISIONING_PROFILE_SPECIFIER="$PROFILE"
           cat > "$RUNNER_TEMP/export-macos-appstore.plist" <<EOF
           <?xml version="1.0" encoding="UTF-8"?>
           <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
@@ -252,35 +261,27 @@ jobs:
         # Best-effort until the App Store Connect app record for io.unom.punktfunk exists.
         continue-on-error: true
         run: |
-          # MANUAL App Store signing: the local (valid) Apple Distribution identity + the App
+          # Archive with AUTOMATIC signing (development) — see the macOS App Store step for the full
-          # Store provisioning profile. NOT -allowProvisioningUpdates — with an App-Manager-role
+          # rationale. The SwiftPM resource bundle (PunktfunkKit_PunktfunkKit, added with the in-app
-          # ASC key that forces Xcode's CLOUD-managed signing, which the role can't do ("Cloud
+          # license screens) builds for iphoneos, so even the sdk-scoped PROVISIONING_PROFILE_SPECIFIER
-          # signing permission error"). The profile must be installed on the runner under
+          # this step used to set matched it and failed the archive ("does not support provisioning
-          # ~/Library/Developer/Xcode/UserData/Provisioning Profiles/ (install it once with
+          # profiles"). Automatic signing profiles only the app and leaves the resource bundle (and
-          # Xcode.app quit, or it prunes the manually-dropped distribution profile).
+          # the macOS-host macro plugins) alone. No -allowProvisioningUpdates → OFFLINE, never
-          # A running Xcode.app prunes unrecognized profiles from that dir — quit it so the App
+          # cloud-signs (the App-Manager ASC key can't), so the runner needs an iOS *development*
-          # Store profile survives this build; headless xcodebuild doesn't need the GUI app.
+          # profile for io.unom.punktfunk installed. DISTRIBUTION signing is the export step below
+          # (manual, via the plist). A running Xcode.app prunes unrecognized profiles — quit it so the
+          # manually-installed App Store distribution profile survives for export.
           osascript -e 'tell application "Xcode" to quit' >/dev/null 2>&1 || true
           pkill -x Xcode 2>/dev/null || true
           PROFILE="Punktfunk iOS App Store Distribution"
-          # Scope signing to the iOS device SDK via an xcconfig — see the tvOS step below for the
-          # full rationale. A global (CLI) profile specifier would also be forced onto the shared
-          # macOS-host SwiftPM macro plugins, which reject it and fail the archive; [sdk=iphoneos*]
-          # in an xcconfig lands it on the app/framework slices only.
-          SIGN_XCCONFIG="$RUNNER_TEMP/sign-ios.xcconfig"
-          cat > "$SIGN_XCCONFIG" <<XCCONF
-          CODE_SIGN_STYLE = Manual
-          DEVELOPMENT_TEAM = $TEAM_ID
-          CODE_SIGN_IDENTITY[sdk=iphoneos*] = Apple Distribution
-          PROVISIONING_PROFILE_SPECIFIER[sdk=iphoneos*] = $PROFILE
-          XCCONF
           DEVELOPER_DIR="$XCODE_DEV_DIR" xcodebuild archive \
             -project "$PROJECT" -scheme Punktfunk-iOS \
             -destination 'generic/platform=iOS' \
             -archivePath "$RUNNER_TEMP/Punktfunk-ios.xcarchive" \
             -skipMacroValidation -skipPackagePluginValidation \
-            -xcconfig "$SIGN_XCCONFIG" \
+            MARKETING_VERSION="$VERSION" CURRENT_PROJECT_VERSION="$BUILD_NUM" \
-            MARKETING_VERSION="$VERSION" CURRENT_PROJECT_VERSION="$BUILD_NUM"
+            CODE_SIGN_STYLE=Automatic \
+            DEVELOPMENT_TEAM="$TEAM_ID"
           cat > "$RUNNER_TEMP/export-appstore.plist" <<EOF
           <?xml version="1.0" encoding="UTF-8"?>
           <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
@@ -312,33 +313,24 @@ jobs:
         # on the runner (xcodebuild -downloadPlatform tvOS).
         continue-on-error: true
         run: |
-          # Same manual App Store signing as iOS (the App-Manager ASC key can't cloud-sign).
+          # Archive with AUTOMATIC signing (development) — see the macOS App Store step. The SwiftPM
+          # resource bundle (PunktfunkKit_PunktfunkKit) builds for appletvos and rejected the
+          # sdk-scoped profile this step used to set; Automatic signing profiles only the app and
+          # leaves the resource bundle + the macOS-host macro plugins (OnceMacro/SwizzlingMacro/
+          # AssociationMacro) alone. No -allowProvisioningUpdates → OFFLINE, never cloud-signs (the
+          # App-Manager ASC key can't), so the runner needs a tvOS *development* profile for
+          # io.unom.punktfunk installed. DISTRIBUTION signing is the export step below (manual, plist).
           osascript -e 'tell application "Xcode" to quit' >/dev/null 2>&1 || true
           pkill -x Xcode 2>/dev/null || true
           PROFILE="Punktfunk tvOS App Store Distribution"
-          # Scope signing to the tvOS device SDK via an xcconfig. A global (CLI) profile specifier
-          # hits EVERY target, including the shared SwiftPM macro plugins (OnceMacro/SwizzlingMacro/
-          # AssociationMacro) which build for the macOS host and reject a provisioning profile
-          # ("<macro> does not support provisioning profiles"), failing the archive. Conditionals
-          # work only in an xcconfig (xcodebuild mis-parses a CLI "SETTING[sdk=..]=val"), and a
-          # command-line -xcconfig outranks target settings, so [sdk=appletvos*] puts the profile on
-          # the app/framework slices only — the macosx-host macros get nothing. (The macOS archive
-          # above is immune: its host-SDK macros are CODE_SIGNING_ALLOWED=NO, so a global specifier
-          # is ignored there.)
-          SIGN_XCCONFIG="$RUNNER_TEMP/sign-tvos.xcconfig"
-          cat > "$SIGN_XCCONFIG" <<XCCONF
-          CODE_SIGN_STYLE = Manual
-          DEVELOPMENT_TEAM = $TEAM_ID
-          CODE_SIGN_IDENTITY[sdk=appletvos*] = Apple Distribution
-          PROVISIONING_PROFILE_SPECIFIER[sdk=appletvos*] = $PROFILE
-          XCCONF
           DEVELOPER_DIR="$XCODE_DEV_DIR" xcodebuild archive \
             -project "$PROJECT" -scheme Punktfunk-tvOS \
             -destination 'generic/platform=tvOS' \
             -archivePath "$RUNNER_TEMP/Punktfunk-tvos.xcarchive" \
             -skipMacroValidation -skipPackagePluginValidation \
-            -xcconfig "$SIGN_XCCONFIG" \
+            MARKETING_VERSION="$VERSION" CURRENT_PROJECT_VERSION="$BUILD_NUM" \
-            MARKETING_VERSION="$VERSION" CURRENT_PROJECT_VERSION="$BUILD_NUM"
+            CODE_SIGN_STYLE=Automatic \
+            DEVELOPMENT_TEAM="$TEAM_ID"
           cat > "$RUNNER_TEMP/export-tvos.plist" <<EOF
           <?xml version="1.0" encoding="UTF-8"?>
           <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

.gitea/workflows/windows-host.yml

@@ -24,8 +24,9 @@
 # GPU backends: the host builds with --features nvenc,amf-qsv = all three vendors in one installer.
 #  - NVENC (NVIDIA, direct SDK): the only link need is nvencodeapi.lib, synthesised from a 2-export
 #    .def with llvm-dlltool (no GPU/SDK at build time).
-#  - AMF/QSV (AMD/Intel, libavcodec): link-imports the FFmpeg libs from FFMPEG_DIR (the BtbN gpl-shared
+#  - AMF/QSV (AMD/Intel, libavcodec): link-imports the FFmpeg libs from FFMPEG_DIR (the BtbN lgpl-shared
 #    tree the client uses; includes the *_amf/*_qsv encoders) and bundles its DLLs into the installer.
+#    lgpl-shared (not gpl-shared) keeps those bundled DLLs LGPL (we never use the GPL-only x264/x265).
 # CI never launches the exe, so no GPU is needed here — this is build + Windows clippy coverage only.
 name: windows-host
 
@@ -80,7 +81,7 @@ jobs:
           # (pwsh Out-File utf8 = no BOM, unlike Windows PowerShell 5.1 — keeps the first line clean).
           "CARGO_TARGET_DIR=C:\t" | Out-File -FilePath $env:GITHUB_ENV -Append -Encoding utf8
           "CARGO_WORKSPACE_DIR=$env:GITHUB_WORKSPACE" | Out-File -FilePath $env:GITHUB_ENV -Append -Encoding utf8
-          # FFMPEG_DIR: the same BtbN gpl-shared x64 tree the Windows CLIENT links against (provisioned
+          # FFMPEG_DIR: the same BtbN lgpl-shared x64 tree the Windows CLIENT links against (provisioned
           # by scripts/ci/setup-windows-runner.ps1). The host's AMD/Intel AMF/QSV encode backend
           # (--features amf-qsv) link-imports avcodec/avutil/swscale from it; pack-host-installer.ps1
           # then bundles its bin\*.dll into the installer. LIBCLANG_PATH is in the runner daemon env.

CLAUDE.md

@@ -144,11 +144,25 @@ Low-latency desktop/game streaming stack, Linux-first, with a shared Rust protoc
    `test-loopback.sh` (Swift client vs synthetic punktfunk1-hosts on loopback — runs on macOS;
    includes the pairing ceremony + `--require-pairing` gate),
    `RemoteFirstLightTests` (full pipeline over the LAN). See
-   [`clients/apple/README.md`](clients/apple/README.md). **Stage 2 presenter**
+   [`clients/apple/README.md`](clients/apple/README.md). **Stage 2 presenter is now the DEFAULT**
-   (`VTDecompressionSession` + `CAMetalLayer`) is built and live-validated on glass behind the opt-in
+   (stage-1 is the Metal-unavailable / DEBUG fallback): explicit `VTDecompressionSession` decode →
-   `punktfunk.presenter` flag (~11 ms p50 capture→present), to become the default after a few
+   `CAMetalLayer`, presented from the hosting view's **main-runloop `CADisplayLink`** (`renderTick` pops
-   resolution/HDR checks. Next: make stage 2 the default, glass-to-glass numbers via
+   the newest ready frame per vsync; macOS `displaySyncEnabled = false` is the real fullscreen-judder fix,
-   `tools/latency-probe`, iOS/iPadOS/tvOS variants.
+   ~11 ms p50). *(An off-main `CAMetalDisplayLink` and an off-main blocking-render present thread were
+   both tried and reverted — both measured slower on macOS and iPad.)* **HDR fixed**
+   (`design/apple-stage2-presenter.md`): the "too bright" bug was a missing reference-white anchor — the
+   fix keeps the PQ-passthrough shader and adds `CAEDRMetadata.hdr10(…, opticalOutputScale: 203)` +
+   `wantsExtendedDynamicRangeContent` on the layer (on all platforms; the old `#if os(macOS)` guard left
+   iOS/tvOS EDR half-engaged), routing the 0xCE mastering metadata to the layer (via `setHdrMeta`) instead
+   of a never-composited source buffer. **Mid-session SDR↔HDR** is handled: `render` reconciles the layer
+   per-frame from the decoded `frame.isHDR` (per-mode pixel format `bgra8`/`rgba16Float`), so a game
+   entering HDR mid-stream just reconfigures (last 0xCE grade cached + re-applied; pump drains 0xCE
+   unconditionally). **4:4:4 added**: decode format is a 2×2 `(chroma, HDR)` matrix
+   (`420v/x420/444v/x444`, all biplanar so the shaders are unchanged), advertised (`VIDEO_CAP_444`) only
+   behind a **hardware-required `VTDecompressionSession` probe** (`Stage444Probe`, validated on M3) with a
+   Settings opt-out + a bounded pump backstop for an undecodable 4:4:4 session. *HDR brightness + 4:4:4
+   still need on-glass validation (Windows-HDR / `PUNKTFUNK_444` host).* Next: glass-to-glass numbers via
+   `tools/latency-probe`.
    **Linux stage 1 done, first light 2026-06-12** (`clients/linux`, binary
    `punktfunk-client`): GTK4/libadwaita shell linking `punktfunk-core` directly (no C ABI;
    `NativeClient` is now `Sync` — mutexed plane receivers), mDNS host list, TOFU + SPAKE2

CONTRIBUTING.md

@@ -0,0 +1,43 @@
+# Contributing to punktfunk
+
+Thanks for your interest in contributing!
+
+## Licensing of contributions (inbound = outbound)
+
+punktfunk is dual-licensed under **MIT OR Apache-2.0**.
+
+> Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in
+> the work by you, as defined in the Apache-2.0 license, shall be dual licensed as **MIT OR
+> Apache-2.0**, without any additional terms or conditions.
+
+By opening a pull request you agree to license your contribution under these terms. This is the
+standard Rust-ecosystem "inbound = outbound" model; it keeps the project's licensing unambiguous
+(including the Apache-2.0 §5 contributor patent grant) and any future relicensing clean. You retain
+the copyright to your contributions.
+
+### Do not paste copyleft (or otherwise incompatibly-licensed) code
+
+The single thing that could poison the permissive license is **copied source from a copyleft
+project**. Several adjacent projects (Sunshine, Apollo, Moonlight) are GPL-3.0. You may study them
+and reimplement a *technique*, protocol, or wire format — those are not copyrightable — but **never
+paste their code**, and do not translate a GPL implementation line-by-line. When a comment credits
+prior art, make clear it is an independent reimplementation, not a copy. The same applies to any
+third party's code under a license incompatible with MIT/Apache.
+
+If you add a new third-party dependency, it must be permissive (MIT / Apache-2.0 / BSD / ISC / Zlib /
+Unicode-3.0 / etc.). `about.toml` holds the accepted-license allow-list; regenerate the attribution
+file with `scripts/gen-third-party-notices.sh` when the dependency tree changes.
+
+## Before you push
+
+```sh
+cargo fmt --all --check
+cargo clippy --workspace --all-targets -- -D warnings
+cargo test  --workspace
+```
+
+Generated artifacts are checked in and CI fails on drift: `include/punktfunk_core.h` (cbindgen) and
+`api/openapi.json` (`cargo run -p punktfunk-host -- openapi`). Match the surrounding code's comment
+density and naming. Commit messages end with the `Co-Authored-By` trailer (see `git log`).
+
+See [`CLAUDE.md`](CLAUDE.md) for the full build/test/run guide and design invariants.

Cargo.lock

@@ -137,18 +137,9 @@ dependencies = [
 
 [[package]]
 name = "anyhow"
-version = "1.0.102"
+version = "1.0.103"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f202df86484c868dbad7eaa557ef785d5c66295e41b460ef922eca0723b842c"
+checksum = "2a4385e2e34eb35d6b3efe798b9eb88096925d87726c0798709bf56d9ed84af3"
-
-[[package]]
-name = "arc-swap"
-version = "1.9.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a3a1fd6f75306b68087b831f025c712524bcb19aad54e557b1129cfa0a2b207"
-dependencies = [
- "rustversion",
-]
 
 [[package]]
 name = "ash"
@@ -161,13 +152,13 @@ dependencies = [
 
 [[package]]
 name = "ashpd"
-version = "0.13.11"
+version = "0.13.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "340e0f6bf7f9ee78549c61454f1460a3ed97c011902ee76b58301bbc6d502a32"
+checksum = "281e6645758940dee594495e28807a7672ce40f11ebf4df6c22c4fcd59e2689f"
 dependencies = [
  "enumflags2",
  "futures-util",
- "getrandom 0.4.2",
+ "getrandom 0.4.3",
  "serde",
  "serde_repr",
  "tokio",
@@ -358,23 +349,18 @@ dependencies = [
 
 [[package]]
 name = "axum-server"
-version = "0.7.3"
+version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c1ab4a3ec9ea8a657c72d99a03a824af695bd0fb5ec639ccbd9cd3543b41a5f9"
+checksum = "b1df331683d982a0b9492b38127151e6453639cd34926eb9c07d4cd8c6d22bfc"
 dependencies = [
- "arc-swap",
  "bytes",
+ "either",
  "fs-err",
  "http",
  "http-body",
  "hyper",
  "hyper-util",
- "pin-project-lite",
- "rustls",
- "rustls-pemfile",
- "rustls-pki-types",
  "tokio",
- "tokio-rustls",
  "tower-service",
 ]
 
@@ -476,9 +462,9 @@ dependencies = [
 
 [[package]]
 name = "bytes"
-version = "1.11.1"
+version = "1.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e748733b7cbc798e1434b6ac524f0c1ff2ab456fe201501e6497c8417a4fc33"
+checksum = "8ae3f5d315924270530207e2a68396c3cc547f6dca3fbdca317cfb1a51edb593"
 
 [[package]]
 name = "cairo-rs"
@@ -520,9 +506,9 @@ dependencies = [
 
 [[package]]
 name = "cbindgen"
-version = "0.29.3"
+version = "0.29.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c95537b45400390270fae69ac098d057c8f5399001cde9d04f700c105ddfff2d"
+checksum = "2ecb53484c9c167ba674026b656d8a27d7657a58e6066aa902bfb1a4aa00ae20"
 dependencies = [
  "clap",
  "heck",
@@ -539,9 +525,9 @@ dependencies = [
 
 [[package]]
 name = "cc"
-version = "1.2.63"
+version = "1.2.65"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "556e016178bb5662a08681bbe0f00f8e17631781a4dfc8c45e466e4b185ec27f"
+checksum = "e228eec9be7c17ccb640b59b36a5cd805ea2a564a4c5e162c2f659fea30d3b96"
 dependencies = [
  "find-msvc-tools",
  "jobserver",
@@ -906,9 +892,6 @@ name = "deranged"
 version = "0.5.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7cd812cc2bc1d69d4764bd80df88b4317eaef9e773c75226407d9bc0876b211c"
-dependencies = [
- "powerfmt",
-]
 
 [[package]]
 name = "digest"
@@ -1127,9 +1110,9 @@ dependencies = [
 
 [[package]]
 name = "flume"
-version = "0.11.1"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "da0e4dd2a88388a1f4ccc7c9ce104604dab68d9f408dc34cd45823d5a9069095"
+checksum = "5e139bc46ca777eb5efaf62df0ab8cc5fd400866427e56c68b22e414e53bd3be"
 dependencies = [
  "futures-core",
  "futures-sink",
@@ -1142,12 +1125,6 @@ version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
-[[package]]
-name = "foldhash"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d9c4f5dac5e15c24eb999c26181a6ca40b39fe946cbe4c263c7209467bc83af2"
-
 [[package]]
 name = "foldhash"
 version = "0.2.0"
@@ -1376,15 +1353,13 @@ dependencies = [
 
 [[package]]
 name = "getrandom"
-version = "0.4.2"
+version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0de51e6874e94e7bf76d726fc5d13ba782deca734ff60d5bb2fb2607c7406555"
+checksum = "300e883d756b2e4ec94e02791f39b04b522276138852cfc41d9fb7e904106099"
 dependencies = [
  "cfg-if",
  "libc",
  "r-efi 6.0.0",
- "wasip2",
- "wasip3",
 ]
 
 [[package]]
@@ -1595,9 +1570,9 @@ dependencies = [
 
 [[package]]
 name = "h2"
-version = "0.4.14"
+version = "0.4.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "171fefbc92fe4a4de27e0698d6a5b392d6a0e333506bc49133760b3bcf948733"
+checksum = "6cb093c84e8bd9b188d4c4a8cb6579fc016968d14c99882163cd3ff402a4f155"
 dependencies = [
  "atomic-waker",
  "bytes",
@@ -1623,22 +1598,13 @@ dependencies = [
  "zerocopy",
 ]
 
-[[package]]
-name = "hashbrown"
-version = "0.15.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9229cfe53dfd69f0609a49f65461bd93001ea1ef889cd5529dd176593f5338a1"
-dependencies = [
- "foldhash 0.1.5",
-]
-
 [[package]]
 name = "hashbrown"
 version = "0.16.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "841d1cc9bed7f9236f321df977030373f4a4163ae1a7dbfe1a51a2c1a51d9100"
 dependencies = [
- "foldhash 0.2.0",
+ "foldhash",
 ]
 
 [[package]]
@@ -1647,7 +1613,7 @@ version = "0.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ed5909b6e89a2db4456e54cd5f673791d7eca6732202bbf2a9cc504fe2f9b84a"
 dependencies = [
- "foldhash 0.2.0",
+ "foldhash",
 ]
 
 [[package]]
@@ -1858,12 +1824,6 @@ dependencies = [
  "zerovec",
 ]
 
-[[package]]
-name = "id-arena"
-version = "2.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3d3067d79b975e8844ca9eb072e16b31c3c1c36928edf9c6789548c524d0d954"
-
 [[package]]
 name = "idna"
 version = "1.1.0"
@@ -2014,9 +1974,9 @@ dependencies = [
 
 [[package]]
 name = "js-sys"
-version = "0.3.100"
+version = "0.3.103"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2025f20d7a4fa7785846e7b63d10a76d3f1cee98ee5cb79ea59703f95e42162"
+checksum = "53b44bfcdb3f8d5837a46dae1ca9660a837176eee74a28b229bc626816589102"
 dependencies = [
  "cfg-if",
  "futures-util",
@@ -2035,7 +1995,7 @@ dependencies = [
 
 [[package]]
 name = "latency-probe"
-version = "0.0.1"
+version = "0.3.0"
 
 [[package]]
 name = "lazy_static"
@@ -2046,12 +2006,6 @@ dependencies = [
  "spin",
 ]
 
-[[package]]
-name = "leb128fmt"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "09edd9e8b54e49e587e4f6295a7d29c3ea94d469cb40ab8ca70b288248a81db2"
-
 [[package]]
 name = "libadwaita"
 version = "0.9.1"
@@ -2167,13 +2121,13 @@ dependencies = [
 
 [[package]]
 name = "log"
-version = "0.4.32"
+version = "0.4.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "953f07c43838f8e6f9758cab68bf5bed85465e7587ebe0b823f1bcd81978ad3a"
+checksum = "0ceec5bc11778974d1bcb055b18002eba7f4b3518b6a0081b3af5f21666da9ad"
 
 [[package]]
 name = "loss-harness"
-version = "0.0.1"
+version = "0.3.0"
 dependencies = [
  "punktfunk-core",
 ]
@@ -2201,9 +2155,9 @@ checksum = "47e1ffaa40ddd1f3ed91f717a33c8c0ee23fff369e3aa8772b9605cc1d22f4c3"
 
 [[package]]
 name = "mdns-sd"
-version = "0.20.0"
+version = "0.20.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "892f96f6d2ebe1ea641279f986ac52a2a6bac71e8f743bb258315cfe2bd7e88e"
+checksum = "fb75febbe5fa1837a52fdbd1c735e168286c5c645fc2ddd31526f65c49941c2e"
 dependencies = [
  "fastrand",
  "flume",
@@ -2216,15 +2170,15 @@ dependencies = [
 
 [[package]]
 name = "memchr"
-version = "2.8.1"
+version = "2.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6b947ae49db0d222b1dbc6b113ce7248a3fc3a6ca21b696717bfc000ba4484d8"
+checksum = "88904434abc2901f197fe8cc55f0445e7ded921dba5911dad2e2b39b48e663c4"
 
 [[package]]
 name = "memmap2"
-version = "0.9.10"
+version = "0.9.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "714098028fe011992e1c3962653c96b2d578c4b4bce9036e15ff220319b1e0e3"
+checksum = "d1219ed1b7f229ee7104d281dd01d6802fe28bb6e95d292942c4daacdeb798c0"
 dependencies = [
  "libc",
 ]
@@ -2377,6 +2331,17 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "521739c6d2bac4aa25192232afe6841231376b2b26d4d9fae5ecf8ca5772e441"
 
+[[package]]
+name = "num-derive"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed3955f1a9c7c0c15e092f9c887db08b1fc683305fdf6eb6684f22555355e202"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "num-integer"
 version = "0.1.46"
@@ -2716,16 +2681,6 @@ dependencies = [
  "zerocopy",
 ]
 
-[[package]]
-name = "prettyplease"
-version = "0.2.37"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "479ca8adacdd7ce8f1fb39ce9ecccbfe93a3f1344b3d0d97f20bc0196208f62b"
-dependencies = [
- "proc-macro2",
- "syn",
-]
-
 [[package]]
 name = "proc-macro-crate"
 version = "3.5.0"
@@ -2765,7 +2720,7 @@ dependencies = [
 
 [[package]]
 name = "punktfunk-client-android"
-version = "0.0.1"
+version = "0.3.0"
 dependencies = [
  "android_logger",
  "jni",
@@ -2779,7 +2734,7 @@ dependencies = [
 
 [[package]]
 name = "punktfunk-client-linux"
-version = "0.0.1"
+version = "0.3.0"
 dependencies = [
  "anyhow",
  "async-channel",
@@ -2799,7 +2754,7 @@ dependencies = [
 
 [[package]]
 name = "punktfunk-client-windows"
-version = "0.0.1"
+version = "0.3.0"
 dependencies = [
  "anyhow",
  "async-channel",
@@ -2819,7 +2774,7 @@ dependencies = [
 
 [[package]]
 name = "punktfunk-core"
-version = "0.0.1"
+version = "0.3.0"
 dependencies = [
  "aes-gcm",
  "bytes",
@@ -2849,7 +2804,7 @@ dependencies = [
 
 [[package]]
 name = "punktfunk-host"
-version = "0.0.1"
+version = "0.3.0"
 dependencies = [
  "aes",
  "aes-gcm",
@@ -2885,7 +2840,6 @@ dependencies = [
  "rsa",
  "rusqlite",
  "rustls",
- "rustls-pemfile",
  "rusty_enet",
  "serde",
  "serde_json",
@@ -2896,12 +2850,14 @@ dependencies = [
  "tracing",
  "tracing-subscriber",
  "ureq",
+ "usbip-sim",
  "utoipa",
  "utoipa-axum",
  "utoipa-scalar",
  "wasapi",
  "wayland-backend",
  "wayland-client",
+ "wayland-protocols",
  "wayland-protocols-misc",
  "wayland-protocols-wlr",
  "wayland-scanner",
@@ -2914,7 +2870,7 @@ dependencies = [
 
 [[package]]
 name = "punktfunk-probe"
-version = "0.0.1"
+version = "0.3.0"
 dependencies = [
  "anyhow",
  "mdns-sd",
@@ -2943,9 +2899,9 @@ dependencies = [
 
 [[package]]
 name = "quinn"
-version = "0.11.9"
+version = "0.11.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b9e20a958963c291dc322d98411f541009df2ced7b5a4f2bd52337638cfccf20"
+checksum = "0c1a41e437b6bbd489372cd4971de128e85c855f56c57f283d20ff016cf7c0a8"
 dependencies = [
  "bytes",
  "cfg_aliases",
@@ -2963,9 +2919,9 @@ dependencies = [
 
 [[package]]
 name = "quinn-proto"
-version = "0.11.14"
+version = "0.11.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "434b42fec591c96ef50e21e886936e66d3cc3f737104fdb9b737c40ffb94c098"
+checksum = "4fcb935c5bec503c2f0e306bdd3e58bb9029dcb14fa8d9ac76e3a5256ac0763e"
 dependencies = [
  "bytes",
  "fastbloom",
@@ -3000,9 +2956,9 @@ dependencies = [
 
 [[package]]
 name = "quote"
-version = "1.0.45"
+version = "1.0.46"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41f2619966050689382d2b44f664f4bc593e129785a36d6ee376ddf37259b924"
+checksum = "dfbc457d0c7a0759a614551b11a6409e5951f6c7537be1f1b7682b9ae9230368"
 dependencies = [
  "proc-macro2",
 ]
@@ -3156,9 +3112,9 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.12.3"
+version = "1.12.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e10754a14b9137dd7b1e3e5b0493cc9171fdd105e0ab477f51b72e7f3ac0e276"
+checksum = "f1292b7759ae1cb9ec195452d1390a074f0cd8541ab7a5a8c31cd6db45d4a6ba"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -3179,9 +3135,9 @@ dependencies = [
 
 [[package]]
 name = "regex-syntax"
-version = "0.8.10"
+version = "0.8.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dc897dd8d9e8bd1ed8cdad82b5966c3e0ecae09fb1907d58efaa013543185d0a"
+checksum = "d6f6ff9a378485b298a5286656da665ba74413d36db0979633275d2e708145d4"
 
 [[package]]
 name = "reis"
@@ -3309,9 +3265,9 @@ dependencies = [
 
 [[package]]
 name = "rustls"
-version = "0.23.40"
+version = "0.23.41"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef86cd5876211988985292b91c96a8f2d298df24e75989a43a3c73f2d4d8168b"
+checksum = "6b92b125634d9b795e7beca796cc790df15a7fb38323bf3196fda83292d06b1f"
 dependencies = [
  "aws-lc-rs",
  "log",
@@ -3335,15 +3291,6 @@ dependencies = [
  "security-framework",
 ]
 
-[[package]]
-name = "rustls-pemfile"
-version = "2.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dce314e5fee3f39953d46bb63bb8a46d40c2f8fb7cc5a3b6cab2bde9721d6e50"
-dependencies = [
- "rustls-pki-types",
-]
-
 [[package]]
 name = "rustls-pki-types"
 version = "1.14.1"
@@ -3740,19 +3687,19 @@ checksum = "0c790de23124f9ab44544d7ac05d60440adc586479ce501c1d6d7da3cd8c9cf5"
 
 [[package]]
 name = "smallvec"
-version = "1.15.1"
+version = "1.15.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "67b1b7a3b5fe4f1376887184045fcf45c69e92af734b7aaddc05fb777b6fbd03"
+checksum = "8ed6a63f02c8539c91a8685a86f4099661ba3da017932f6ebbea6de3f0fa7c90"
 
 [[package]]
 name = "socket-pktinfo"
-version = "0.3.2"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "927136cc2ae6a1b0e66ac6b1210902b75c3f726db004a73bc18686dcd0dcd22f"
+checksum = "3e8e43b4bdce7cff8a4d3f8025ee38fce5ca138fab868ebbf9529c81328fbf9d"
 dependencies = [
  "libc",
  "socket2",
- "windows-sys 0.60.2",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -3828,9 +3775,9 @@ checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"
 
 [[package]]
 name = "syn"
-version = "2.0.117"
+version = "2.0.118"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e665b8803e7b1d2a727f4023456bbbbe74da67099c585258af0ad9c5013b9b99"
+checksum = "1b9ae57f904213ebb649ce6895b8a66c66f0203b9319718f69a5612a065b1422"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -3880,7 +3827,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "32497e9a4c7b38532efcdebeef879707aa9f794296a4f0244f6f69e9bc8574bd"
 dependencies = [
  "fastrand",
- "getrandom 0.4.2",
+ "getrandom 0.4.3",
  "once_cell",
  "rustix",
  "windows-sys 0.61.2",
@@ -3937,12 +3884,11 @@ dependencies = [
 
 [[package]]
 name = "time"
-version = "0.3.47"
+version = "0.3.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "743bd48c283afc0388f9b8827b976905fb217ad9e647fae3a379a9283c4def2c"
+checksum = "85c17d80feb7334b40c484e45ed1a5273dfd8bfda537c3be2e74a06a6686f327"
 dependencies = [
  "deranged",
- "itoa",
  "num-conv",
  "powerfmt",
  "serde_core",
@@ -3952,15 +3898,15 @@ dependencies = [
 
 [[package]]
 name = "time-core"
-version = "0.1.8"
+version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7694e1cfe791f8d31026952abf09c69ca6f6fa4e1a1229e18988f06a04a12dca"
+checksum = "9e1c906769ad99c88eaa54e728060edef082f8e358ff32030cb7c7d315e81109"
 
 [[package]]
 name = "time-macros"
-version = "0.2.27"
+version = "0.2.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2e70e4c5a0e0a8a4823ad65dfe1a6930e4f4d756dcd9dd7939022b5e8c501215"
+checksum = "dcef1a61bdb119096e153208ec5cbec23944ce8bca13be5c7f60c634f7403935"
 dependencies = [
  "num-conv",
  "time-core",
@@ -4259,12 +4205,6 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b4ac048d71ede7ee76d585517add45da530660ef4390e49b098733c6e897f254"
 
-[[package]]
-name = "unicode-xid"
-version = "0.2.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ebc1c04c71510c7f702b52b7c350734c9ff1295c464a03335b00bb84fc54f853"
-
 [[package]]
 name = "universal-hash"
 version = "0.5.1"
@@ -4309,6 +4249,17 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "usbip-sim"
+version = "0.8.0"
+dependencies = [
+ "log",
+ "num-derive",
+ "num-traits",
+ "serde",
+ "tokio",
+]
+
 [[package]]
 name = "utf8_iter"
 version = "1.0.4"
@@ -4372,9 +4323,9 @@ dependencies = [
 
 [[package]]
 name = "uuid"
-version = "1.23.2"
+version = "1.23.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d258b83ceec21034727ecee8c382cfa6c3e133699b0742c64571814fb420c9f7"
+checksum = "bf80a72845275afea99e7f2b434723d3bc7e38470fcd1c7ed39a599c73319a53"
 dependencies = [
  "js-sys",
  "serde_core",
@@ -4445,27 +4396,18 @@ checksum = "ccf3ec651a847eb01de73ccad15eb7d99f80485de043efb2f370cd654f4ea44b"
 
 [[package]]
 name = "wasip2"
-version = "1.0.3+wasi-0.2.9"
+version = "1.0.4+wasi-0.2.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "20064672db26d7cdc89c7798c48a0fdfac8213434a1186e5ef29fd560ae223d6"
+checksum = "b67efb37e106e55ce722a510d6b5f9c17f083e5fc79afc2badeb12cc313d9487"
 dependencies = [
- "wit-bindgen 0.57.1",
+ "wit-bindgen",
-]
-
-[[package]]
-name = "wasip3"
-version = "0.4.0+wasi-0.3.0-rc-2026-01-06"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5428f8bf88ea5ddc08faddef2ac4a67e390b88186c703ce6dbd955e1c145aca5"
-dependencies = [
- "wit-bindgen 0.51.0",
 ]
 
 [[package]]
 name = "wasm-bindgen"
-version = "0.2.123"
+version = "0.2.126"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a254a4b10c19a76f09a27640e7ffbf9bc30bf67e16a3bf28aaefa4920fe81563"
+checksum = "4b067c0c11094aef6b7a801c1e34a26affafdf3d051dba08456b868789aaf9a4"
 dependencies = [
  "cfg-if",
  "once_cell",
@@ -4476,9 +4418,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.123"
+version = "0.2.126"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "24a40fc75b0ec6f3746ceb10d36f53a93dcd68a93b11b6445983945d79eba0dc"
+checksum = "167ce5e579f6bcf889c4f7175a8a5a585de84e8ff93976ce393efa5f2837aab1"
 dependencies = [
  "quote",
  "wasm-bindgen-macro-support",
@@ -4486,9 +4428,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.123"
+version = "0.2.126"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "908f34bd9b9ce3d4caf07b72dfab63d61504d156856c6bd3cd87fa350cf3985b"
+checksum = "f3997c7839262f4ef12cf90b818d6340c18e80f263f1a94bf157d0ec4420380e"
 dependencies = [
  "bumpalo",
  "proc-macro2",
@@ -4499,47 +4441,13 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.123"
+version = "0.2.126"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7acbf7616c27b194bbb550bf77ed0c2c3e5b7fd1260a93082b95fb7f47959b92"
+checksum = "dc1b4cb0cc549fcf58d7dfc081778139b3d283a081644e833e84682ad71cea24"
 dependencies = [
  "unicode-ident",
 ]
 
-[[package]]
-name = "wasm-encoder"
-version = "0.244.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "990065f2fe63003fe337b932cfb5e3b80e0b4d0f5ff650e6985b1048f62c8319"
-dependencies = [
- "leb128fmt",
- "wasmparser",
-]
-
-[[package]]
-name = "wasm-metadata"
-version = "0.244.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bb0e353e6a2fbdc176932bbaab493762eb1255a7900fe0fea1a2f96c296cc909"
-dependencies = [
- "anyhow",
- "indexmap",
- "wasm-encoder",
- "wasmparser",
-]
-
-[[package]]
-name = "wasmparser"
-version = "0.244.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "47b807c72e1bac69382b3a6fb3dbe8ea4c0ed87ff5629b8685ae6b9a611028fe"
-dependencies = [
- "bitflags",
- "hashbrown 0.15.5",
- "indexmap",
- "semver",
-]
-
 [[package]]
 name = "wayland-backend"
 version = "0.3.15"
@@ -4567,9 +4475,9 @@ dependencies = [
 
 [[package]]
 name = "wayland-protocols"
-version = "0.32.12"
+version = "0.32.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "563a85523cade2429938e790815fd7319062103b9f4a2dc806e9b53b95982d8f"
+checksum = "23d0c813de3daa2ed6520af85a3bd49b0e722a3078506899aa9686fea58dc4b6"
 dependencies = [
  "bitflags",
  "wayland-backend",
@@ -4635,9 +4543,9 @@ dependencies = [
 
 [[package]]
 name = "webpki-root-certs"
-version = "1.0.7"
+version = "1.0.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f31141ce3fc3e300ae89b78c0dd67f9708061d1d2eda54b8209346fd6be9a92c"
+checksum = "0d46a5a140e6f7afeccd8eae97eff335163939eac8b929834875168b29b3d267"
 dependencies = [
  "rustls-pki-types",
 ]
@@ -5195,100 +5103,12 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
-[[package]]
-name = "wit-bindgen"
-version = "0.51.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d7249219f66ced02969388cf2bb044a09756a083d0fab1e566056b04d9fbcaa5"
-dependencies = [
- "wit-bindgen-rust-macro",
-]
-
 [[package]]
 name = "wit-bindgen"
 version = "0.57.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1ebf944e87a7c253233ad6766e082e3cd714b5d03812acc24c318f549614536e"
 
-[[package]]
-name = "wit-bindgen-core"
-version = "0.51.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ea61de684c3ea68cb082b7a88508a8b27fcc8b797d738bfc99a82facf1d752dc"
-dependencies = [
- "anyhow",
- "heck",
- "wit-parser",
-]
-
-[[package]]
-name = "wit-bindgen-rust"
-version = "0.51.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b7c566e0f4b284dd6561c786d9cb0142da491f46a9fbed79ea69cdad5db17f21"
-dependencies = [
- "anyhow",
- "heck",
- "indexmap",
- "prettyplease",
- "syn",
- "wasm-metadata",
- "wit-bindgen-core",
- "wit-component",
-]
-
-[[package]]
-name = "wit-bindgen-rust-macro"
-version = "0.51.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c0f9bfd77e6a48eccf51359e3ae77140a7f50b1e2ebfe62422d8afdaffab17a"
-dependencies = [
- "anyhow",
- "prettyplease",
- "proc-macro2",
- "quote",
- "syn",
- "wit-bindgen-core",
- "wit-bindgen-rust",
-]
-
-[[package]]
-name = "wit-component"
-version = "0.244.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d66ea20e9553b30172b5e831994e35fbde2d165325bec84fc43dbf6f4eb9cb2"
-dependencies = [
- "anyhow",
- "bitflags",
- "indexmap",
- "log",
- "serde",
- "serde_derive",
- "serde_json",
- "wasm-encoder",
- "wasm-metadata",
- "wasmparser",
- "wit-parser",
-]
-
-[[package]]
-name = "wit-parser"
-version = "0.244.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ecc8ac4bc1dc3381b7f59c34f00b67e18f910c2c0f50015669dde7def656a736"
-dependencies = [
- "anyhow",
- "id-arena",
- "indexmap",
- "log",
- "semver",
- "serde",
- "serde_derive",
- "serde_json",
- "unicode-xid",
- "wasmparser",
-]
-
 [[package]]
 name = "writeable"
 version = "0.6.3"
@@ -5419,18 +5239,18 @@ dependencies = [
 
 [[package]]
 name = "zerocopy"
-version = "0.8.50"
+version = "0.8.52"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3b065d4f0e55f82fae73202e189638116a87c55ab6b8e6c2721e13dd9d854ad1"
+checksum = "ce1022995ff5ff5d841ad7d994facc23098cd40152f2c1d11cd607c6f530653f"
 dependencies = [
  "zerocopy-derive",
 ]
 
 [[package]]
 name = "zerocopy-derive"
-version = "0.8.50"
+version = "0.8.52"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b631b19d36a892ab55420c92dbc83ccd79274f25be714855d3074aa71cab639"
+checksum = "1ae7f38b72ec2a254e2b87ef277cf2cd4fb97cbebf944faa6f33354da0867930"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -5460,9 +5280,9 @@ dependencies = [
 
 [[package]]
 name = "zeroize"
-version = "1.8.2"
+version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b97154e67e32c85465826e8bcc1c59429aaaf107c1e4a9e53c8d8ccd5eff88d0"
+checksum = "e13c156562582aa81c60cb29407084cdb54c4164760106ab78e6c5b0858cf64e"
 
 [[package]]
 name = "zerotrie"

Cargo.toml

@@ -3,6 +3,7 @@ resolver = "2"
 members = [
     "crates/punktfunk-core",
     "crates/punktfunk-host",
+    "crates/punktfunk-host/vendor/usbip-sim",
     "crates/pf-driver-proto",
     "clients/probe",
     "clients/linux",
@@ -11,9 +12,11 @@ members = [
     "tools/latency-probe",
     "tools/loss-harness",
 ]
+# Standalone PoC (built on its own; pulls usbip/tokio/libusb we don't want in the workspace).
+exclude = ["packaging/linux/steam-deck-gadget/usbip-poc"]
 
 [workspace.package]
-version = "0.0.1"
+version = "0.3.0"
 edition = "2021"
 rust-version = "1.82"
 license = "MIT OR Apache-2.0"

README.md

@@ -155,4 +155,31 @@ tools/                       latency-probe · loss-harness (measurement)
 
 ## License
 
-MIT OR Apache-2.0.
+Licensed under either of
+
+- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
+  <https://www.apache.org/licenses/LICENSE-2.0>)
+- MIT license ([LICENSE-MIT](LICENSE-MIT) or <https://opensource.org/licenses/MIT>)
+
+at your option — `SPDX-License-Identifier: MIT OR Apache-2.0`.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in
+the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any
+additional terms or conditions. See [CONTRIBUTING.md](CONTRIBUTING.md).
+
+### Third-party components
+
+punktfunk's own source is MIT/Apache-2.0. Shipped binaries additionally link third-party components
+under their own (permissive) licenses — see [`THIRD-PARTY-NOTICES.txt`](THIRD-PARTY-NOTICES.txt)
+(regenerate with `scripts/gen-third-party-notices.sh`). The Windows host and client builds also
+bundle FFmpeg under the **LGPL v2.1+** (dynamically linked, replaceable DLLs; the license text and
+notice ship in the installed `licenses/` folder).
+
+### Trademarks
+
+punktfunk is an independent project and is **not affiliated with, endorsed by, or sponsored by**
+NVIDIA, Microsoft, Sony, Valve, or the Moonlight project. "GameStream", "Moonlight", "Xbox",
+"DualSense", "DualShock", and "PlayStation" are trademarks of their respective owners and are used
+here only to describe interoperability.

about.hbs

@@ -0,0 +1,23 @@
+THIRD-PARTY SOFTWARE NOTICES
+============================================================================
+
+punktfunk (https://git.unom.io/unom/punktfunk) is licensed under MIT OR Apache-2.0.
+The binaries it ships statically/dynamically link the third-party Rust crates below.
+Each is distributed under its own permissive license; full texts follow.
+Generated by `cargo about generate about.hbs` (see about.toml) — do not edit by hand.
+
+Overview:
+{{#each overview}}
+  {{name}} ({{id}}): {{count}} crate(s)
+{{/each}}
+
+{{#each licenses}}
+----------------------------------------------------------------------------
+{{name}} ({{id}})
+Used by:
+{{#each used_by}}  - {{crate.name}} {{crate.version}}{{#if crate.repository}}  ({{crate.repository}}){{/if}}
+{{/each}}
+----------------------------------------------------------------------------
+{{text}}
+
+{{/each}}

about.toml

@@ -0,0 +1,49 @@
+# cargo-about config — full-fidelity third-party license harvest for CI.
+#
+#   cargo install cargo-about
+#   cargo about generate about.hbs > THIRD-PARTY-NOTICES.txt   # (or use scripts/gen-third-party-notices.sh)
+#
+# `accepted` is the allow-list of SPDX licenses permitted in the dependency tree. CI fails if a crate
+# carries anything not listed here — which is exactly the regression guard we want against a copyleft
+# dependency silently entering the linked set. All entries
+# below are permissive / attribution-only; deliberately NO GPL/LGPL/AGPL/MPL-link/SSPL/EPL.
+#
+# The dependency-free fallback is scripts/gen-third-party-notices.py (reads the cargo registry cache),
+# which is what produced the committed baseline when cargo-about is unavailable offline.
+
+accepted = [
+    "MIT",
+    "MIT-0",
+    "Apache-2.0",
+    "Apache-2.0 WITH LLVM-exception",
+    "BSD-2-Clause",
+    "BSD-3-Clause",
+    "ISC",
+    "Zlib",
+    "0BSD",
+    "BSL-1.0",
+    "Unicode-3.0",
+    "Unicode-DFS-2016",
+    "CDLA-Permissive-2.0",
+    "CC0-1.0",
+    "Unlicense",
+    "WTFPL",
+    "OpenSSL",
+]
+
+# cbindgen is MPL-2.0 but it is a BUILD-ONLY codegen tool that never links into a shipped artifact
+# (its generated header is not a derivative work), so it is excluded from the notices rather than
+# accepted as a linked license.
+ignore-build-dependencies = true
+ignore-dev-dependencies = true
+
+# r-efi offers an LGPL-2.1-or-later arm but is tri-licensed; take a permissive arm. (It is also
+# UEFI-target-gated out of every shipped build.)
+[r-efi.clarify]
+license = "MIT OR Apache-2.0"
+
+[ring.clarify]
+license = "MIT AND ISC AND OpenSSL"
+
+[aws-lc-sys.clarify]
+license = "ISC AND Apache-2.0 AND MIT AND BSD-3-Clause AND OpenSSL"

api/openapi.json

@@ -10,7 +10,7 @@
       "name": "MIT OR Apache-2.0",
       "identifier": "MIT OR Apache-2.0"
     },
-    "version": "0.0.1"
+    "version": "0.3.0"
   },
   "paths": {
     "/api/v1/clients": {
@@ -1354,6 +1354,14 @@
         "type": "object",
         "description": "Arm-native-pairing request body.",
         "properties": {
+          "fingerprint": {
+            "type": [
+              "string",
+              "null"
+            ],
+            "description": "Optional: bind the window to ONE device fingerprint (hex SHA-256, e.g. from a pending knock).\nWhen set, only a pairing attempt from that fingerprint consumes the window — so an unpaired\nLAN peer can neither pair nor burn a window armed for a specific device (security-review #9).\nOmit for an unbound window (any device may use the PIN — trusted-LAN only).",
+            "example": "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08"
+          },
           "ttl_secs": {
             "type": [
               "integer",

clients/android/app/src/main/kotlin/io/unom/punktfunk/ConnectScreen.kt

@@ -74,10 +74,31 @@ import io.unom.punktfunk.kit.security.KnownHostStore
 import io.unom.punktfunk.kit.security.obtainIdentity
 import io.unom.punktfunk.models.HostStatus
 import io.unom.punktfunk.models.PendingTrust
+import java.util.concurrent.atomic.AtomicBoolean
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 
+/** Handshake budget for a normal connect (the prior hardcoded value, now passed explicitly). */
+private const val CONNECT_TIMEOUT_MS = 10_000
+
+/**
+ * Handshake budget for the no-PIN "request access" connect. Must exceed the host's approval-park
+ * window (~180 s) so a slow operator approval still lands on this same parked connection rather than
+ * timing the client out first. Mirrors the Linux client's 185 s.
+ */
+private const val REQUEST_ACCESS_TIMEOUT_MS = 185_000
+
+/**
+ * A no-PIN "request access" connect in flight — the host being requested (drives the cancelable
+ * "Waiting for approval…" dialog) and a per-attempt flag the Cancel button trips. The connect is a
+ * blocking call with no abort, so Cancel returns the UI immediately and a late result checks
+ * [cancelled] and tears the (possibly just-approved) session down silently rather than navigating.
+ */
+private class RequestAccessState(val target: PendingTrust) {
+    val cancelled = AtomicBoolean(false)
+}
+
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun ConnectScreen(settings: Settings, onConnected: (Long) -> Unit) {
@@ -128,8 +149,11 @@ fun ConnectScreen(settings: Settings, onConnected: (Long) -> Unit) {
             .onSuccess { identity = it }
             .onFailure { status = "Identity unavailable: ${it.message} — re-pair may be required" }
     }
-    // A trust decision awaiting the user (first-connect TOFU / fp changed / PIN pairing).
+    // A trust decision awaiting the user (first-connect TOFU / fp changed / PIN pairing / the
+    // request-access-or-PIN choice).
     var pendingTrust by remember { mutableStateOf<PendingTrust?>(null) }
+    // A no-PIN "request access" connect in flight (the cancelable "Waiting for approval…" dialog).
+    var awaiting by remember { mutableStateOf<RequestAccessState?>(null) }
     // A saved host whose label is being edited (the Rename dialog).
     var renameTarget by remember { mutableStateOf<KnownHost?>(null) }
 
@@ -151,9 +175,9 @@ fun ConnectScreen(settings: Settings, onConnected: (Long) -> Unit) {
         status = "Connecting to $targetHost:$targetPort…"
         discovery.stop() // free the Wi-Fi radio before the stream session
         scope.launch {
-            // Advertise HDR only when this device's display can present it (else the host sends a
+            // Advertise HDR only when the user enabled it AND this device's display can present it
-            // proper SDR stream rather than PQ the panel would mis-tone-map).
+            // (else the host sends a proper SDR stream rather than PQ the panel would mis-tone-map).
-            val hdrEnabled = displaySupportsHdr(context)
+            val hdrEnabled = settings.hdrEnabled && displaySupportsHdr(context)
             // "Automatic" resolves to a concrete pad type from the connected controller's VID/PID
             // (Android exposes no controller-type enum) — parity with the Linux/Apple clients. An
             // explicit choice is passed through unchanged.
@@ -163,7 +187,7 @@ fun ConnectScreen(settings: Settings, onConnected: (Long) -> Unit) {
                     targetHost, targetPort, w, h, hz,
                     id.certPem, id.privateKeyPem, pinHex ?: "",
                     settings.bitrateKbps, settings.compositor, gamepadPref,
-                    hdrEnabled, settings.audioChannels,
+                    hdrEnabled, settings.audioChannels, CONNECT_TIMEOUT_MS,
                 )
             }
             connecting = false
@@ -182,10 +206,66 @@ fun ConnectScreen(settings: Settings, onConnected: (Long) -> Unit) {
         }
     }
 
-    // Decide pinned-reconnect vs fp-changed vs TOFU vs PIN pairing before connecting. Trust state is
+    // The no-PIN "request access" path (delegated approval): open a normal identified connect that
+    // the host PARKS until the operator clicks Approve in its console/web UI, showing a cancelable
+    // "Waiting for approval…" dialog meanwhile. The SAME connection is admitted on approval (no
+    // reconnect), so on success we record the host as PAIRED — the operator's approval IS the pairing.
+    // The connect can't be aborted, so Cancel returns the UI immediately and a late result is torn
+    // down silently via the per-attempt flag (mirrors the Linux client's request-access flow).
+    fun requestAccess(target: PendingTrust) {
+        val id = identity
+        if (id == null) {
+            status = "Identity not ready yet — try again in a moment"
+            return
+        }
+        val req = RequestAccessState(target)
+        awaiting = req
+        connecting = true
+        status = null
+        discovery.stop() // free the Wi-Fi radio before the (parked) stream session
+        scope.launch {
+            val hdrEnabled = settings.hdrEnabled && displaySupportsHdr(context)
+            val gamepadPref = Gamepad.resolvePref(settings.gamepad)
+            // Pin the advertised fingerprint for a discovered host (defence against an impostor while
+            // we wait); a manually-typed host has none, so trust-on-first-use.
+            val pinHex = target.advertisedFp ?: ""
+            val handle = withContext(Dispatchers.IO) {
+                NativeBridge.nativeConnect(
+                    target.host, target.port, w, h, hz,
+                    id.certPem, id.privateKeyPem, pinHex,
+                    settings.bitrateKbps, settings.compositor, gamepadPref,
+                    hdrEnabled, settings.audioChannels, REQUEST_ACCESS_TIMEOUT_MS,
+                )
+            }
+            // Cancelled while we were parked: tear the (possibly just-approved) session down and
+            // don't touch UI a fresh action may now own.
+            if (req.cancelled.get()) {
+                if (handle != 0L) withContext(Dispatchers.IO) { NativeBridge.nativeClose(handle) }
+                return@launch
+            }
+            awaiting = null
+            connecting = false
+            if (handle != 0L) {
+                // Approved — save the host as PAIRED, pinning the fingerprint it presented, so
+                // future connects are silent (exactly like after a PIN ceremony).
+                val fp = NativeBridge.nativeHostFingerprint(handle)
+                if (fp.isNotEmpty()) {
+                    knownHostStore.save(KnownHost(target.host, target.port, target.name, fp, paired = true))
+                    savedHosts = knownHostStore.all()
+                }
+                onConnected(handle)
+            } else {
+                status = "Request timed out — approve this device in the host's console, then retry."
+                discovery.start()
+            }
+        }
+    }
+
+    // Decide pinned-reconnect vs fp-changed vs TOFU vs pairing before connecting. Trust state is
     // keyed by address:port, so a discovered and a manually-typed connection to the same host share
     // one record. Trust-on-first-use is permitted ONLY when the host advertised pair=optional; a
-    // pair=required host, or a manual/unknown-policy host, must pair by PIN.
+    // pair=required host, or a manual/unknown-policy host, must pair — either by no-PIN request
+    // access (approve in the console) or by the SPAKE2 PIN ceremony.
     fun connect(
         targetHost: String,
         targetPort: Int,
@@ -208,9 +288,10 @@ fun ConnectScreen(settings: Settings, onConnected: (Long) -> Unit) {
             // clearly labeled, alongside PIN pairing). Smart-cast: this branch ⇒ dh != null.
             dh?.pairingRequired == false -> pendingTrust =
                 PendingTrust(targetHost, targetPort, name, dh.fingerprint, PendingTrust.Kind.TRUST_NEW)
-            // pair=required, or a manual/unknown-policy host → PIN pairing is mandatory.
+            // pair=required, or a manual/unknown-policy host → offer the two ways in: a no-PIN
+            // "request access" (approve in the console) or the SPAKE2 PIN ceremony.
             else -> pendingTrust =
-                PendingTrust(targetHost, targetPort, name, adv, PendingTrust.Kind.PAIR)
+                PendingTrust(targetHost, targetPort, name, adv, PendingTrust.Kind.REQUEST_ACCESS)
         }
     }
 
@@ -471,6 +552,33 @@ fun ConnectScreen(settings: Settings, onConnected: (Long) -> Unit) {
                     TextButton({ pendingTrust = null }) { Text("Cancel") }
                 },
             )
+            // A fresh pair=required (or manual/unknown-policy) host: offer the two ways in. "Request
+            // access" is the no-PIN path — connect and wait for the operator to click Approve in the
+            // host's console; "Use a PIN…" switches to the SPAKE2 ceremony.
+            PendingTrust.Kind.REQUEST_ACCESS -> AlertDialog(
+                onDismissRequest = { pendingTrust = null },
+                title = { Text("Pairing required") },
+                text = {
+                    Column {
+                        Text("${pt.host}:${pt.port} requires pairing before it will stream.")
+                        Text(
+                            "Request access and approve this device in the host's console (or web " +
+                                "UI) — no PIN needed. Or pair with the 4-digit PIN the host displays.",
+                        )
+                    }
+                },
+                confirmButton = {
+                    TextButton({ pendingTrust = null; requestAccess(pt) }) { Text("Request access") }
+                },
+                dismissButton = {
+                    Row {
+                        TextButton({ pendingTrust = pt.copy(kind = PendingTrust.Kind.PAIR) }) {
+                            Text("Use a PIN…")
+                        }
+                        TextButton({ pendingTrust = null }) { Text("Cancel") }
+                    }
+                },
+            )
             PendingTrust.Kind.PAIR -> {
                 var pin by remember(pt) { mutableStateOf("") }
                 var name by remember(pt) { mutableStateOf(Build.MODEL ?: "Android") }
@@ -537,6 +645,44 @@ fun ConnectScreen(settings: Settings, onConnected: (Long) -> Unit) {
         }
     }
 
+    // The no-PIN "request access" wait: the connect is parked on the host until the operator
+    // approves this device. Cancel returns the UI immediately — it trips the per-attempt flag so a
+    // late approval is torn down silently (see requestAccess) and resumes discovery.
+    awaiting?.let { req ->
+        fun cancel() {
+            req.cancelled.set(true)
+            awaiting = null
+            connecting = false
+            discovery.start() // the request may still be pending on the host; keep scanning
+        }
+        AlertDialog(
+            onDismissRequest = { cancel() },
+            title = { Text("Waiting for approval") },
+            text = {
+                val deviceName = Build.MODEL ?: "this device"
+                Column(verticalArrangement = Arrangement.spacedBy(12.dp)) {
+                    Row(
+                        verticalAlignment = Alignment.CenterVertically,
+                        horizontalArrangement = Arrangement.spacedBy(12.dp),
+                    ) {
+                        CircularProgressIndicator(modifier = Modifier.size(20.dp), strokeWidth = 2.dp)
+                        Text("Approve this device on ${req.target.name}.")
+                    }
+                    Text(
+                        "Open the host's console (or web UI) and approve “$deviceName”. It connects " +
+                            "automatically once you approve — no PIN needed.",
+                        style = MaterialTheme.typography.bodyMedium,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    )
+                }
+            },
+            confirmButton = {},
+            dismissButton = {
+                TextButton(onClick = { cancel() }) { Text("Cancel") }
+            },
+        )
+    }
+
     // Rename a saved host's label (discovered hosts are named by mDNS; this is how you give one a
     // friendly name like "Living Room" after pairing). Keyed by the host so reopening resets the field.
     renameTarget?.let { kh ->

clients/android/app/src/main/kotlin/io/unom/punktfunk/LicensesScreen.kt

@@ -0,0 +1,66 @@
+package io.unom.punktfunk
+
+import androidx.activity.compose.BackHandler
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.unit.dp
+
+/**
+ * Open-source licenses: punktfunk's own license (MIT OR Apache-2.0) plus the third-party software
+ * notices, read from the bundled `THIRD-PARTY-NOTICES.txt` asset (generated by
+ * scripts/gen-third-party-notices.sh). Reached from [SettingsScreen]; Back returns there.
+ */
+@Composable
+fun LicensesScreen(onBack: () -> Unit) {
+    val context = LocalContext.current
+    BackHandler(onBack = onBack)
+
+    val notices = remember {
+        runCatching {
+            context.assets.open("THIRD-PARTY-NOTICES.txt").bufferedReader().use { it.readText() }
+        }.getOrDefault("Third-party notices unavailable.")
+    }
+    val version = remember {
+        runCatching {
+            @Suppress("DEPRECATION")
+            context.packageManager.getPackageInfo(context.packageName, 0).versionName
+        }.getOrNull()
+    }
+
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .verticalScroll(rememberScrollState())
+            .padding(horizontal = 20.dp, vertical = 24.dp),
+        verticalArrangement = Arrangement.spacedBy(16.dp),
+    ) {
+        Text("Open-source licenses", style = MaterialTheme.typography.headlineMedium)
+        if (version != null) {
+            Text(
+                "punktfunk $version",
+                style = MaterialTheme.typography.bodyMedium,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+            )
+        }
+        Text(
+            "punktfunk is licensed under MIT OR Apache-2.0, at your option. It uses the open-source " +
+                "components below, each under its own license.",
+            style = MaterialTheme.typography.bodyMedium,
+        )
+        Text(
+            notices,
+            style = MaterialTheme.typography.bodySmall.copy(fontFamily = FontFamily.Monospace),
+        )
+    }
+}

clients/android/app/src/main/kotlin/io/unom/punktfunk/Settings.kt

@@ -14,6 +14,13 @@ data class Settings(
     val height: Int = 0,
     val hz: Int = 0,
     val bitrateKbps: Int = 0,
+    /**
+     * Advertise HDR (10-bit BT.2020 PQ) to the host. Default on, but only *effective* on a panel that
+     * can actually present HDR10 (see [displaySupportsHdr]) — on an SDR display HDR is never
+     * advertised regardless, so the host sends a proper 8-bit BT.709 stream rather than PQ the panel
+     * would mis-tone-map. Turning this off forces SDR even on a capable panel.
+     */
+    val hdrEnabled: Boolean = true,
     val compositor: Int = 0,
     val gamepad: Int = 0,
     /** Requested audio channel count: 2 (stereo), 6 (5.1) or 8 (7.1). The host clamps to what it
@@ -40,6 +47,7 @@ class SettingsStore(context: Context) {
         height = prefs.getInt(K_H, 0),
         hz = prefs.getInt(K_HZ, 0),
         bitrateKbps = prefs.getInt(K_BITRATE, 0),
+        hdrEnabled = prefs.getBoolean(K_HDR, true),
         compositor = prefs.getInt(K_COMPOSITOR, 0),
         gamepad = prefs.getInt(K_GAMEPAD, 0),
         audioChannels = prefs.getInt(K_AUDIO_CH, 2),
@@ -54,6 +62,7 @@ class SettingsStore(context: Context) {
             .putInt(K_H, s.height)
             .putInt(K_HZ, s.hz)
             .putInt(K_BITRATE, s.bitrateKbps)
+            .putBoolean(K_HDR, s.hdrEnabled)
             .putInt(K_COMPOSITOR, s.compositor)
             .putInt(K_GAMEPAD, s.gamepad)
             .putInt(K_AUDIO_CH, s.audioChannels)
@@ -68,6 +77,7 @@ class SettingsStore(context: Context) {
         const val K_H = "height"
         const val K_HZ = "hz"
         const val K_BITRATE = "bitrate_kbps"
+        const val K_HDR = "hdr_enabled"
         const val K_COMPOSITOR = "compositor"
         const val K_GAMEPAD = "gamepad"
         const val K_AUDIO_CH = "audio_channels"

clients/android/app/src/main/kotlin/io/unom/punktfunk/SettingsScreen.kt

@@ -5,6 +5,7 @@ import android.content.pm.PackageManager
 import androidx.activity.compose.BackHandler
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.ColumnScope
@@ -44,6 +45,7 @@ import androidx.core.content.ContextCompat
 fun SettingsScreen(initial: Settings, onChange: (Settings) -> Unit, onBack: () -> Unit) {
     var s by remember { mutableStateOf(initial) }
     val context = LocalContext.current
+    var showLicenses by remember { mutableStateOf(false) }
     fun update(next: Settings) {
         s = next
         onChange(next)
@@ -56,6 +58,11 @@ fun SettingsScreen(initial: Settings, onChange: (Settings) -> Unit, onBack: () -
         ActivityResultContracts.RequestPermission(),
     ) { granted -> update(s.copy(micEnabled = granted)) }
 
+    if (showLicenses) {
+        LicensesScreen(onBack = { showLicenses = false })
+        return
+    }
+
     Column(
         modifier = Modifier
             .fillMaxSize()
@@ -87,6 +94,22 @@ fun SettingsScreen(initial: Settings, onChange: (Settings) -> Unit, onBack: () -
                 options = BITRATE_OPTIONS,
                 selected = s.bitrateKbps,
             ) { kbps -> update(s.copy(bitrateKbps = kbps)) }
+
+            // HDR is only meaningful on a panel that can present HDR10; on an SDR display the toggle
+            // is disabled (and HDR is never advertised regardless) so the host doesn't send PQ the
+            // panel would mis-tone-map. The capability is fixed for the device, so read it once.
+            val hdrCapable = remember { displaySupportsHdr(context) }
+            ToggleRow(
+                title = "HDR",
+                subtitle = if (hdrCapable) {
+                    "Stream 10-bit HDR (BT.2020 PQ) when the host supports it"
+                } else {
+                    "This display can't present HDR10 — streams stay SDR"
+                },
+                checked = s.hdrEnabled && hdrCapable,
+                enabled = hdrCapable,
+                onCheckedChange = { on -> update(s.copy(hdrEnabled = on)) },
+            )
         }
 
         SettingsGroup("Host") {
@@ -143,6 +166,14 @@ fun SettingsScreen(initial: Settings, onChange: (Settings) -> Unit, onBack: () -
                 onCheckedChange = { on -> update(s.copy(statsHudEnabled = on)) },
             )
         }
+
+        SettingsGroup("About") {
+            ClickableRow(
+                title = "Open-source licenses",
+                subtitle = "Third-party notices and credits",
+                onClick = { showLicenses = true },
+            )
+        }
     }
 }
 
@@ -166,15 +197,41 @@ private fun SettingsGroup(title: String, content: @Composable ColumnScope.() ->
     }
 }
 
-/** A title + subtitle on the left, a Switch on the right. */
+/** A title + subtitle on the left, a Switch on the right. [enabled] greys out the whole row. */
 @Composable
 private fun ToggleRow(
     title: String,
     subtitle: String,
     checked: Boolean,
     onCheckedChange: (Boolean) -> Unit,
+    enabled: Boolean = true,
 ) {
+    // Dim the labels when disabled so the row reads as inactive (the Switch dims itself).
+    val labelAlpha = if (enabled) 1f else 0.38f
     Row(modifier = Modifier.fillMaxWidth(), verticalAlignment = Alignment.CenterVertically) {
+        Column(Modifier.weight(1f)) {
+            Text(
+                title,
+                style = MaterialTheme.typography.bodyLarge,
+                color = MaterialTheme.colorScheme.onSurface.copy(alpha = labelAlpha),
+            )
+            Text(
+                subtitle,
+                style = MaterialTheme.typography.bodySmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = labelAlpha),
+            )
+        }
+        Switch(checked = checked, onCheckedChange = onCheckedChange, enabled = enabled)
+    }
+}
+
+/** A title + subtitle on the left; the whole row is clickable (opens a sub-screen). */
+@Composable
+private fun ClickableRow(title: String, subtitle: String, onClick: () -> Unit) {
+    Row(
+        modifier = Modifier.fillMaxWidth().clickable(onClick = onClick),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
         Column(Modifier.weight(1f)) {
             Text(title, style = MaterialTheme.typography.bodyLarge)
             Text(
@@ -183,7 +240,6 @@ private fun ToggleRow(
                 color = MaterialTheme.colorScheme.onSurfaceVariant,
             )
         }
-        Switch(checked = checked, onCheckedChange = onCheckedChange)
     }
 }
 

clients/android/app/src/main/kotlin/io/unom/punktfunk/StreamScreen.kt

@@ -1,6 +1,7 @@
 package io.unom.punktfunk
 
 import android.Manifest
+import android.content.pm.ActivityInfo
 import android.content.pm.PackageManager
 import android.view.SurfaceHolder
 import android.view.SurfaceView
@@ -102,6 +103,13 @@ fun StreamScreen(handle: Long, micEnabled: Boolean, onDisconnect: () -> Unit) {
             it.systemBarsBehavior = WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
             it.hide(WindowInsetsCompat.Type.systemBars())
         }
+        // Lock to landscape while streaming — the host streams a landscape desktop, so pin the device
+        // there (either landscape direction is fine) and stop it rotating to portrait mid-session. The
+        // activity declares configChanges=orientation, so this re-lays out the surface in place without
+        // recreating the activity (no stream restart). On TV (fixed landscape) it's a harmless no-op.
+        // The prior request is captured and restored on the way out.
+        val priorOrientation = activity?.requestedOrientation
+        activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE
         activity?.streamHandle = handle // route hardware keys to this session
         activity?.axisMapper = Gamepad.AxisMapper(handle) // route joystick axes
         // Host→client feedback (rumble + DualSense lightbar/LEDs); poll threads stopped before close.
@@ -114,6 +122,9 @@ fun StreamScreen(handle: Long, micEnabled: Boolean, onDisconnect: () -> Unit) {
             activity?.streamHandle = 0L
             controller?.show(WindowInsetsCompat.Type.systemBars())
             window?.clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+            // Release the landscape lock so the rest of the app follows the device/system again.
+            activity?.requestedOrientation =
+                priorOrientation ?: ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED
             // Leaving the stream: stop the mic + audio + decode threads and tear down the session.
             NativeBridge.nativeStopMic(handle)
             NativeBridge.nativeStopAudio(handle)
@@ -314,9 +325,11 @@ fun StreamScreen(handle: Long, micEnabled: Boolean, onDisconnect: () -> Unit) {
 }
 
 /**
- * The live stats overlay — mirrors the Apple client's HUD. Reads the 10-double layout from
+ * The live stats overlay — mirrors the Apple client's HUD. Reads the 14-double layout from
  * [NativeBridge.nativeVideoStats]:
- * `[fps, mbps, latP50Ms, latP95Ms, latValid, skew, w, h, hz, dropped]`.
+ * `[fps, mbps, latP50Ms, latP95Ms, latValid, skew, w, h, hz, dropped, bitDepth, colorPrimaries,
+ * colorTransfer, chromaFormatIdc]`. The trailing four (present on a current native lib) describe the
+ * negotiated video feed and render as a codec/depth/colour/chroma line; older layouts just omit it.
  */
 @Composable
 internal fun StatsOverlay(s: DoubleArray, modifier: Modifier = Modifier) {
@@ -338,6 +351,14 @@ internal fun StatsOverlay(s: DoubleArray, modifier: Modifier = Modifier) {
             fontFamily = FontFamily.Monospace,
             fontSize = 12.sp,
         )
+        videoFeedLine(s)?.let { feed ->
+            Text(
+                feed,
+                color = Color.White,
+                fontFamily = FontFamily.Monospace,
+                fontSize = 12.sp,
+            )
+        }
         if (latValid) {
             val tag = if (skew) "" else " (same-host)"
             Text(
@@ -357,3 +378,31 @@ internal fun StatsOverlay(s: DoubleArray, modifier: Modifier = Modifier) {
         }
     }
 }
+
+/**
+ * Format the negotiated video-feed descriptor from the trailing four stats doubles
+ * `[bitDepth, colorPrimaries, colorTransfer, chromaFormatIdc]`, e.g.
+ * `HEVC · 10-bit · HDR (BT.2020 PQ) · 4:2:0`. Returns `null` on a pre-video-feed layout (< 14 doubles)
+ * so the overlay simply omits the line. The codes are CICP / H.273: transfer 16 = PQ, 18 = HLG (else
+ * SDR); primaries 9 = BT.2020, 1 = BT.709; chroma_format_idc 1 = 4:2:0, 2 = 4:2:2, 3 = 4:4:4. The
+ * Android decoder is always HEVC (`video/hevc`).
+ */
+private fun videoFeedLine(s: DoubleArray): String? {
+    if (s.size < 14) return null
+    val bitDepth = s[10].toInt()
+    val primaries = s[11].toInt()
+    val transfer = s[12].toInt()
+    val chromaIdc = s[13].toInt()
+    val depthLabel = if (bitDepth > 0) "$bitDepth-bit" else "8-bit"
+    val (dynamicRange, colorSpace) = when (transfer) {
+        16 -> "HDR" to "BT.2020 PQ"
+        18 -> "HDR" to "BT.2020 HLG"
+        else -> "SDR" to if (primaries == 9) "BT.2020" else "BT.709"
+    }
+    val chromaLabel = when (chromaIdc) {
+        3 -> "4:4:4"
+        2 -> "4:2:2"
+        else -> "4:2:0"
+    }
+    return "HEVC · $depthLabel · $dynamicRange ($colorSpace) · $chromaLabel"
+}

clients/android/app/src/main/kotlin/io/unom/punktfunk/models/UiModels.kt

@@ -14,8 +14,10 @@ enum class Tab(val label: String, val icon: ImageVector) {
 /**
  * A trust decision awaiting the user before a connect proceeds. [name] is the label to save the
  * host under. Trust-on-first-use ([Kind.TRUST_NEW]) is only ever offered when the host ADVERTISED
- * pair=optional; a pair=required host or a manually-typed/unknown-policy host goes straight to PIN
+ * pair=optional; a pair=required host or a manually-typed/unknown-policy host is offered the
- * pairing ([Kind.PAIR]), and a changed fingerprint forces re-pairing — never a silent re-trust.
+ * two ways in ([Kind.REQUEST_ACCESS]): a no-PIN "request access" connect the operator approves in
+ * the host's console, or the SPAKE2 PIN ceremony ([Kind.PAIR]). A changed fingerprint forces
+ * re-pairing by PIN ([Kind.FP_CHANGED]) — never a silent re-trust.
  */
 data class PendingTrust(
     val host: String,
@@ -24,7 +26,7 @@ data class PendingTrust(
     val advertisedFp: String?,
     val kind: Kind,
 ) {
-    enum class Kind { TRUST_NEW, FP_CHANGED, PAIR }
+    enum class Kind { TRUST_NEW, FP_CHANGED, PAIR, REQUEST_ACCESS }
 }
 
 /** Trust state of a host, shown as a colored pill on its card. */

clients/android/app/src/test/kotlin/io/unom/punktfunk/screenshots/ShotScenes.kt

@@ -186,9 +186,11 @@ internal fun StreamScene() {
                 Brush.linearGradient(listOf(Color(0xFF2A1E5C), Color(0xFF0E1B3D), Color(0xFF06122B))),
             ),
     ) {
-        // [fps, mbps, latP50, latP95, latValid, skew, w, h, hz, dropped]
+        // [fps, mbps, latP50, latP95, latValid, skew, w, h, hz, dropped,
+        //  bitDepth, colorPrimaries, colorTransfer, chromaFormatIdc] — the last four = a 10-bit
+        //  BT.2020 PQ (HDR) 4:2:0 feed, so the HUD renders its video-feed line.
         StatsOverlay(
-            doubleArrayOf(238.0, 921.4, 1.3, 2.1, 1.0, 1.0, 5120.0, 1440.0, 240.0, 0.0),
+            doubleArrayOf(238.0, 921.4, 1.3, 2.1, 1.0, 1.0, 5120.0, 1440.0, 240.0, 0.0, 10.0, 9.0, 16.0, 1.0),
             Modifier.align(Alignment.TopStart).padding(12.dp),
         )
     }

clients/android/kit/src/main/kotlin/io/unom/punktfunk/kit/Gamepad.kt

@@ -50,15 +50,25 @@ object Gamepad {
     const val PREF_DUALSENSE = 2
     const val PREF_XBOXONE = 3
     const val PREF_DUALSHOCK4 = 4
+    const val PREF_STEAMCONTROLLER = 5
+    const val PREF_STEAMDECK = 6
 
     // USB vendor ids of the controllers we can identify by VID/PID.
     private const val VID_SONY = 0x054C
     private const val VID_MICROSOFT = 0x045E
+    private const val VID_VALVE = 0x28DE
 
     // Sony product ids. DualSense (PS5) and DualShock 4 (PS4) map to distinct host pad types.
     private val PID_DUALSENSE = setOf(0x0CE6, 0x0DF2)
     private val PID_DUALSHOCK4 = setOf(0x05C4, 0x09CC)
 
+    // Valve: Steam Deck built-in controller (0x1205); classic Steam Controller wired (0x1102) /
+    // dongle (0x1142). The host builds the virtual hid-steam pad; rich-input capture (paddles /
+    // trackpads / gyro) is out of scope on Android (no rich-input plane yet), so only the standard
+    // buttons + sticks reach the host for now — parity with the desktop type resolution.
+    private val PID_STEAMDECK = setOf(0x1205)
+    private val PID_STEAMCONTROLLER = setOf(0x1102, 0x1142)
+
     // Microsoft Xbox One / Series product ids (wired + the common Bluetooth/dongle revisions). All
     // behave like Xbox 360 on the host minus the glyph identity, so they share one pref byte.
     private val PID_XBOXONE = setOf(
@@ -82,6 +92,8 @@ object Gamepad {
             vid == VID_SONY && pid in PID_DUALSENSE -> PREF_DUALSENSE
             vid == VID_SONY && pid in PID_DUALSHOCK4 -> PREF_DUALSHOCK4
             vid == VID_MICROSOFT && pid in PID_XBOXONE -> PREF_XBOXONE
+            vid == VID_VALVE && pid in PID_STEAMDECK -> PREF_STEAMDECK
+            vid == VID_VALVE && pid in PID_STEAMCONTROLLER -> PREF_STEAMCONTROLLER
             else -> PREF_XBOX360
         }
     }

clients/android/kit/src/main/kotlin/io/unom/punktfunk/kit/NativeBridge.kt

@@ -29,8 +29,10 @@ object NativeBridge {
      * trust-on-first-use — read [nativeHostFingerprint] after; else 64-hex host SHA-256, mismatch →
      * `0`). [width]/[height]/[refreshHz] are the requested virtual-output mode (the host streams at
      * exactly this); [bitrateKbps] 0 = host default; [compositorPref]/[gamepadPref] are the
-     * `CompositorPref`/`GamepadPref` wire bytes (0 = Auto). Returns an opaque session handle, or `0`
+     * `CompositorPref`/`GamepadPref` wire bytes (0 = Auto). [timeoutMs] is the handshake budget — the
-     * on failure. Pair with exactly one [nativeClose].
+     * normal path passes a short value, the no-PIN "request access" path a long one (≥ the host's
+     * approval-park window) so a slow operator approval lands on this same parked connection. Returns
+     * an opaque session handle, or `0` on failure. Pair with exactly one [nativeClose].
      */
     external fun nativeConnect(
         host: String,
@@ -46,6 +48,7 @@ object NativeBridge {
         gamepadPref: Int,
         hdrEnabled: Boolean,
         audioChannels: Int,
+        timeoutMs: Int,
     ): Long
 
     /** 64-hex SHA-256 of the cert the host presented on [handle]; valid after a successful connect. */
@@ -100,9 +103,12 @@ object NativeBridge {
 
     /**
      * Drain ~1 s of live decode stats for the on-stream HUD, or `null` when no decode thread runs.
-     * Returns 10 doubles:
+     * Returns 14 doubles:
-     * `[fps, mbps, latP50Ms, latP95Ms, latValid, skewCorrected, width, height, refreshHz, framesDropped]`
+     * `[fps, mbps, latP50Ms, latP95Ms, latValid, skewCorrected, width, height, refreshHz, framesDropped,
-     * (the two flags are 1.0/0.0). Poll ~1 Hz; each call resets the measurement window.
+     * bitDepth, colorPrimaries, colorTransfer, chromaFormatIdc]`
+     * (the two flags are 1.0/0.0; the trailing four describe the negotiated video feed — bit depth
+     * 8/10, CICP primaries/transfer, and the HEVC chroma_format_idc 1=4:2:0 / 3=4:4:4). Poll ~1 Hz;
+     * each call resets the measurement window.
      */
     external fun nativeVideoStats(handle: Long): DoubleArray?
 

clients/android/native/src/feedback.rs

@@ -114,6 +114,11 @@ pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeNextHidout(
                 out[2..n].copy_from_slice(&effect);
                 n
             }
+            HidOutput::TrackpadHaptic { .. } => {
+                // Steam Controller trackpad-coil haptics — no Android equivalent; drop it (motor
+                // rumble already rides the universal 0xCA plane).
+                return -1;
+            }
         };
         n as jint
     })

clients/android/native/src/session.rs

@@ -140,13 +140,15 @@ pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeGenerateIde
 }
 
 /// `NativeBridge.nativeConnect(host, port, w, h, hz, certPem, keyPem, pinHex, bitrateKbps,
-/// compositorPref, gamepadPref, hdrEnabled, audioChannels): Long`. `certPem`/`keyPem` empty =
+/// compositorPref, gamepadPref, hdrEnabled, audioChannels, timeoutMs): Long`. `certPem`/`keyPem`
-/// anonymous, else presented as the persistent identity. `pinHex` empty = TOFU (read
+/// empty = anonymous, else presented as the persistent identity. `pinHex` empty = TOFU (read
 /// `nativeHostFingerprint` after), else 64-hex SHA-256 to pin the host (mismatch → 0). `bitrateKbps`
 /// 0 = host default. `compositorPref`/`gamepadPref` are `CompositorPref`/`GamepadPref` wire bytes
 /// (0 = Auto; unknown → Auto). `audioChannels` is the requested surround layout (2/6/8; normalized,
-/// anything else → stereo) — the host clamps it and the resolved count drives playback.
+/// anything else → stereo) — the host clamps it and the resolved count drives playback. `timeoutMs`
-/// Returns an opaque handle, or 0 on failure (logged).
+/// is the handshake budget: the normal path passes a short value, the no-PIN "request access" path a
+/// long one (≥ the host's approval-park window) so a slow operator approval lands on this same parked
+/// connection rather than timing the client out first. Returns an opaque handle, or 0 on failure.
 #[no_mangle]
 #[allow(clippy::too_many_arguments)]
 pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeConnect<'local>(
@@ -165,6 +167,7 @@ pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeConnect<'lo
     gamepad_pref: jint,
     hdr_enabled: jboolean,
     audio_channels: jint,
+    timeout_ms: jint,
 ) -> jlong {
     let host: String = match env.get_string(&host) {
         Ok(s) => s.into(),
@@ -224,7 +227,9 @@ pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeConnect<'lo
         None,     // launch: default app
         pin,      // Some → Crypto on host-fp mismatch
         identity, // owned (cert, key) PEM, or None (anonymous)
-        Duration::from_secs(10),
+        // Handshake budget from Kotlin: ~10 s for a normal connect, ~185 s for "request access"
+        // (the host parks the connection until the operator approves the device — see ConnectScreen).
+        Duration::from_millis(timeout_ms.max(0) as u64),
     ) {
         Ok(client) => {
             let handle = SessionHandle {
@@ -404,11 +409,13 @@ pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeStopVideo(
 }
 
 /// `NativeBridge.nativeVideoStats(handle): DoubleArray?` — drain ~1 s of decode stats for the HUD.
-/// Returns 10 doubles
+/// Returns 14 doubles
-/// `[fps, mbps, latP50Ms, latP95Ms, latValid, skewCorrected, width, height, refreshHz, framesDropped]`
+/// `[fps, mbps, latP50Ms, latP95Ms, latValid, skewCorrected, width, height, refreshHz, framesDropped,
-/// (the two flags are 1.0/0.0), or `null` when no decode thread is running. Poll ~1 Hz from the UI;
+/// bitDepth, colorPrimaries, colorTransfer, chromaFormatIdc]`
-/// each call resets the measurement window. Not android-gated — pure `jni` + connector reads, so it
+/// (the two flags are 1.0/0.0; the trailing four describe the negotiated video feed — see below), or
-/// links on the host build too (Kotlin only ever calls it on device).
+/// `null` when no decode thread is running. Poll ~1 Hz from the UI; each call resets the measurement
+/// window. Not android-gated — pure `jni` + connector reads, so it links on the host build too
+/// (Kotlin only ever calls it on device).
 #[no_mangle]
 pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeVideoStats(
     env: JNIEnv,
@@ -426,7 +433,8 @@ pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeVideoStats(
             None => return std::ptr::null_mut(), // not streaming → no stats
         };
         let mode = h.client.mode();
-        let buf: [f64; 10] = [
+        let color = h.client.color;
+        let buf: [f64; 14] = [
             snap.fps,
             snap.mbps,
             snap.lat_p50_ms,
@@ -437,6 +445,14 @@ pub extern "system" fn Java_io_unom_punktfunk_kit_NativeBridge_nativeVideoStats(
             mode.height as f64,
             mode.refresh_hz as f64,
             h.client.frames_dropped() as f64,
+            // Video-feed properties the host resolved at the handshake (Welcome): encode bit depth
+            // (8 / 10), the CICP colour primaries + transfer code points (Kotlin maps these to a
+            // colour-space / HDR label — transfer 16 = PQ, 18 = HLG ⇒ HDR), and the HEVC
+            // chroma_format_idc (1 = 4:2:0, 3 = 4:4:4). Static for the session unless renegotiated.
+            h.client.bit_depth as f64,
+            color.primaries as f64,
+            color.transfer as f64,
+            h.client.chroma_format as f64,
         ];
         let arr = match env.new_double_array(buf.len() as jsize) {
             Ok(a) => a,

clients/apple/Package.swift

@@ -16,6 +16,18 @@ let package = Package(
         .target(
             name: "PunktfunkKit",
             dependencies: ["PunktfunkCore"],
+            // OSS attribution shown by the app's Acknowledgements screen. Bundled here (not in the
+            // app target) so it rides along via Bundle.module in both `swift build` and the Xcode
+            // app, which links the PunktfunkKit product. Refresh with
+            // scripts/gen-third-party-notices.sh (it copies the generated file into Resources/).
+            resources: [
+                .copy("Resources/THIRD-PARTY-NOTICES.txt"),
+                .copy("Resources/LICENSE-MIT.txt"),
+                .copy("Resources/LICENSE-APACHE.txt"),
+                // Geist (SIL OFL 1.1) — the brand typeface, shared with punktfunk-website.
+                // Registered with Core Text at first use; see BrandFont.swift.
+                .copy("Resources/Fonts"),
+            ],
             linkerSettings: [
                 // Rust staticlib system deps.
                 .linkedFramework("Security"),

clients/apple/Punktfunk.xcodeproj/project.pbxproj

@@ -364,7 +364,7 @@
 				ENABLE_HARDENED_RUNTIME = YES;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = Config/Info.plist;
-				INFOPLIST_KEY_CFBundleDisplayName = "Punktfunkempfänger";
+				INFOPLIST_KEY_CFBundleDisplayName = "Punktfunk";
 				INFOPLIST_KEY_LSApplicationCategoryType = "public.app-category.utilities";
 				INFOPLIST_KEY_NSHumanReadableCopyright = "";
 				INFOPLIST_KEY_NSLocalNetworkUsageDescription = "Punktfunk connects directly to your punktfunk host on the local network to stream video, audio, and input.";
@@ -398,7 +398,7 @@
 				ENABLE_HARDENED_RUNTIME = YES;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = Config/Info.plist;
-				INFOPLIST_KEY_CFBundleDisplayName = "Punktfunkempfänger";
+				INFOPLIST_KEY_CFBundleDisplayName = "Punktfunk";
 				INFOPLIST_KEY_LSApplicationCategoryType = "public.app-category.utilities";
 				INFOPLIST_KEY_NSHumanReadableCopyright = "";
 				INFOPLIST_KEY_NSLocalNetworkUsageDescription = "Punktfunk connects directly to your punktfunk host on the local network to stream video, audio, and input.";
@@ -429,7 +429,7 @@
 				CURRENT_PROJECT_VERSION = 1;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = Config/Info.plist;
-				INFOPLIST_KEY_CFBundleDisplayName = "Punktfunkempfänger";
+				INFOPLIST_KEY_CFBundleDisplayName = "Punktfunk";
 				INFOPLIST_KEY_LSApplicationCategoryType = "public.app-category.utilities";
 				INFOPLIST_KEY_NSLocalNetworkUsageDescription = "Punktfunk connects directly to your punktfunk host on the local network to stream video, audio, and input.";
 				INFOPLIST_KEY_NSMicrophoneUsageDescription = "Your microphone is streamed to the connected punktfunk host, where it appears as a virtual microphone.";
@@ -468,7 +468,7 @@
 				CURRENT_PROJECT_VERSION = 1;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = Config/Info.plist;
-				INFOPLIST_KEY_CFBundleDisplayName = "Punktfunkempfänger";
+				INFOPLIST_KEY_CFBundleDisplayName = "Punktfunk";
 				INFOPLIST_KEY_LSApplicationCategoryType = "public.app-category.utilities";
 				INFOPLIST_KEY_NSLocalNetworkUsageDescription = "Punktfunk connects directly to your punktfunk host on the local network to stream video, audio, and input.";
 				INFOPLIST_KEY_NSMicrophoneUsageDescription = "Your microphone is streamed to the connected punktfunk host, where it appears as a virtual microphone.";
@@ -506,7 +506,7 @@
 				CURRENT_PROJECT_VERSION = 1;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = Config/Info.plist;
-				INFOPLIST_KEY_CFBundleDisplayName = "Punktfunkempfänger";
+				INFOPLIST_KEY_CFBundleDisplayName = "Punktfunk";
 				INFOPLIST_KEY_LSApplicationCategoryType = "public.app-category.utilities";
 				INFOPLIST_KEY_NSLocalNetworkUsageDescription = "Punktfunk connects directly to your punktfunk host on the local network to stream video, audio, and input.";
 				INFOPLIST_KEY_UIApplicationSceneManifest_Generation = YES;
@@ -536,7 +536,7 @@
 				CURRENT_PROJECT_VERSION = 1;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = Config/Info.plist;
-				INFOPLIST_KEY_CFBundleDisplayName = "Punktfunkempfänger";
+				INFOPLIST_KEY_CFBundleDisplayName = "Punktfunk";
 				INFOPLIST_KEY_LSApplicationCategoryType = "public.app-category.utilities";
 				INFOPLIST_KEY_NSLocalNetworkUsageDescription = "Punktfunk connects directly to your punktfunk host on the local network to stream video, audio, and input.";
 				INFOPLIST_KEY_UIApplicationSceneManifest_Generation = YES;

clients/apple/Sources/PunktfunkClient/AcknowledgementsView.swift

@@ -0,0 +1,87 @@
+import PunktfunkKit
+import SwiftUI
+
+/// Open-source acknowledgements: punktfunk's own license (MIT OR Apache-2.0) followed by the
+/// third-party software notices. Used as a pushed view on iOS/tvOS and a preferences tab on macOS.
+struct AcknowledgementsView: View {
+    private var version: String? {
+        Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String
+    }
+
+    var body: some View {
+        ScrollView {
+            // Top-level LazyVStack so the third-party-notices chunks (Licenses.thirdPartyNoticesChunks,
+            // ~885 KB total) load lazily as they scroll into view — a single Text that large overshoots
+            // the text-rendering height limit (blank below the limit + very slow). spacing 0 keeps the
+            // notice chunks visually continuous; the header block carries its own spacing + bottom pad.
+            LazyVStack(alignment: .leading, spacing: 0) {
+                VStack(alignment: .leading, spacing: 18) {
+                    Text("punktfunk")
+                        .font(.geist(22, .bold, relativeTo: .title2))
+                    if let version {
+                        Text("Version \(version)")
+                            .font(.geist(12, relativeTo: .caption))
+                            .foregroundStyle(.secondary)
+                    }
+                    Text(Licenses.appLicense)
+                        .font(.caption.monospaced())
+                        .modifier(SelectableText())
+
+                    Divider()
+
+                    Text("Bundled font")
+                        .font(.geist(17, .semibold, relativeTo: .headline))
+                    Text("punktfunk ships the Geist typeface (Geist Sans), "
+                        + "© The Geist Project Authors / Vercel, used under the SIL Open Font "
+                        + "License 1.1.")
+                        .font(.geist(12, relativeTo: .caption))
+                        .foregroundStyle(.secondary)
+                    if !Licenses.fontLicense.isEmpty {
+                        Text(Licenses.fontLicense)
+                            .font(.caption2.monospaced())
+                            .modifier(SelectableText())
+                    }
+
+                    Divider()
+
+                    Text("Third-party software")
+                        .font(.geist(17, .semibold, relativeTo: .headline))
+                    Text(
+                        "punktfunk uses the open-source components below, each under its own license. "
+                            + "On some platforms FFmpeg is additionally bundled under the LGPL v2.1+ "
+                            + "(dynamically linked, replaceable)."
+                    )
+                    .font(.geist(12, relativeTo: .caption))
+                    .foregroundStyle(.secondary)
+                }
+                .frame(maxWidth: .infinity, alignment: .leading)
+                .padding(.bottom, 18)
+
+                ForEach(Licenses.thirdPartyNoticesChunks.indices, id: \.self) { i in
+                    Text(Licenses.thirdPartyNoticesChunks[i])
+                        .font(.caption2.monospaced())
+                        .frame(maxWidth: .infinity, alignment: .leading)
+                        .modifier(SelectableText())
+                }
+            }
+            .frame(maxWidth: 900, alignment: .leading)
+            .frame(maxWidth: .infinity, alignment: .leading)
+            .padding()
+            #if os(tvOS)
+                .padding(40)
+            #endif
+        }
+        .navigationTitle("Acknowledgements")
+    }
+}
+
+/// `textSelection(.enabled)` is unavailable on tvOS, so apply it only where it exists.
+private struct SelectableText: ViewModifier {
+    func body(content: Content) -> some View {
+        #if os(tvOS)
+            content
+        #else
+            content.textSelection(.enabled)
+        #endif
+    }
+}

clients/apple/Sources/PunktfunkClient/AddHostSheet.swift

@@ -81,6 +81,11 @@ struct AddHostSheet: View {
             #if !os(tvOS)
         .formStyle(.grouped)
         #endif
+            #if os(iOS)
+            // The detent below is sized to fit all 3 rows + the action button exactly, so the
+            // Form must NOT scroll/bounce inside it — lock it. (iOS 16+; safe at iOS 17.)
+            .scrollDisabled(true)
+            #endif
             #if os(macOS)
             // macOS: UNCHANGED — Cancel + Spacer + Add in an HStack, both wired to the
             // window's default/cancel keyboard actions. The 380-wide .fixedSize panel below
@@ -120,8 +125,8 @@ struct AddHostSheet: View {
         // Form + the full-width action row, instead of the half-screen .medium it used to rest
         // at. A single fixed detent is enough: the system keeps the content above the keyboard
         // when Address/Port is focused, and on iPadOS this renders as a short bottom sheet (not a
-        // centered formSheet card). If Dynamic Type grows the rows past this height the Form just
+        // centered formSheet card). The Form itself is .scrollDisabled (above) so it can't
-        // scrolls inside the detent — nothing is clipped. (.height(_:) is iOS 16+, safe at iOS 17.)
+        // bounce/scroll inside this fixed detent. (.height(_:) is iOS 16+, safe at iOS 17.)
         .presentationDetents([.height(320)])
         .presentationDragIndicator(.visible)
         #endif

clients/apple/Sources/PunktfunkClient/BrandTheme.swift

@@ -0,0 +1,39 @@
+// App-wide brand chrome. SwiftUI has no single switch to put a custom font on every navigation
+// title, so the iOS large/inline nav titles are themed through UINavigationBar's appearance proxy
+// (set once at launch). Backgrounds are left at the system defaults — transparent at the scroll
+// edge (the large title floats on the content), blurred once scrolled — so only the typeface
+// changes: Geist, matching the cards and the website.
+
+#if os(iOS)
+import PunktfunkKit
+import UIKit
+
+enum BrandTheme {
+    static func apply() {
+        BrandFont.registerIfNeeded()
+
+        let scrollEdge = UINavigationBarAppearance()
+        scrollEdge.configureWithTransparentBackground()
+        applyFonts(to: scrollEdge)
+
+        let standard = UINavigationBarAppearance()
+        standard.configureWithDefaultBackground()
+        applyFonts(to: standard)
+
+        let proxy = UINavigationBar.appearance()
+        proxy.scrollEdgeAppearance = scrollEdge
+        proxy.standardAppearance = standard
+        proxy.compactAppearance = standard
+    }
+
+    /// Override only the title fonts; leave colors/backgrounds at the configured defaults.
+    private static func applyFonts(to appearance: UINavigationBarAppearance) {
+        if let large = UIFont(name: "Geist-Bold", size: 34) {
+            appearance.largeTitleTextAttributes[.font] = large
+        }
+        if let inline = UIFont(name: "Geist-SemiBold", size: 17) {
+            appearance.titleTextAttributes[.font] = inline
+        }
+    }
+}
+#endif

clients/apple/Sources/PunktfunkClient/ContentView.swift

@@ -4,10 +4,12 @@
 // (HomeView/HostCards), the trust prompt (TrustCardView), and the HUD (StreamHUDView) live in
 // their own files.
 //
-// Two ways to establish trust on first contact: the TOFU prompt (host fingerprint over the
+// Ways to establish trust on first contact: the TOFU prompt (host fingerprint over the
-// live-but-blurred stream, compared with the host's log) or the PIN pairing ceremony — pairing
+// live-but-blurred stream, compared with the host's log; only for a host advertising pair=optional),
-// verifies both sides at once and is the only way into hosts running --require-pairing. Once
+// the PIN pairing ceremony (verifies both sides at once), or — for a host that requires pairing —
-// pinned, reconnects are silent and a changed host identity refuses to connect.
+// delegated approval ("Request Access": a plain identified connect the host parks until the operator
+// approves this device in its console, no PIN). Once pinned, reconnects are silent and a changed
+// host identity refuses to connect.
 
 #if os(macOS)
 import AppKit
@@ -26,11 +28,18 @@ struct ContentView: View {
     @AppStorage(DefaultsKey.gamepadType) private var gamepadType = 0
     @AppStorage(DefaultsKey.bitrateKbps) private var bitrateKbps = 0
     @AppStorage(DefaultsKey.audioChannels) private var audioChannels = 2
+    @AppStorage(DefaultsKey.hdrEnabled) private var hdrEnabled = true
     @AppStorage(DefaultsKey.fullscreenWhileStreaming) private var fullscreenWhileStreaming = true
     @AppStorage(DefaultsKey.hudEnabled) private var hudEnabled = true
     @AppStorage(DefaultsKey.hudPlacement) private var hudPlacement = HUDPlacement.topTrailing.rawValue
     @State private var showAddHost = false
     @State private var pairingTarget: StoredHost?
+    /// A fresh `pair=required`/unknown host the user tapped: drives the choice between no-PIN
+    /// delegated approval ("Request Access") and the SPAKE2 PIN ceremony (rule 3b).
+    @State private var approvalChoice: ApprovalRequest?
+    /// A delegated-approval connect is in flight (host parks it until the operator approves):
+    /// drives the cancelable "Waiting for approval" prompt and the pin-as-paired on success.
+    @State private var awaitingApproval: ApprovalRequest?
     @State private var speedTestTarget: StoredHost?
     @State private var libraryTarget: StoredHost?
     #if !os(macOS)
@@ -55,10 +64,31 @@ struct ContentView: View {
             autoConnectIfAsked()
         }
         .onChange(of: model.phase) { _, phase in
-            // A session actually started — remember it on the card ("Connected … ago"
+            switch phase {
-            // plus the accent ring on the most recent host).
+            case .streaming:
-            if case .streaming = phase, let host = model.activeHost {
+                // A session actually started — remember it on the card ("Connected … ago"
-                store.markConnected(host.id)
+                // plus the accent ring on the most recent host).
+                guard let host = model.activeHost else { break }
+                // Delegated approval just succeeded: the operator let this device in, so pin the
+                // host's observed fingerprint and remember it as paired — future connects are then
+                // silent (rule 1), exactly like after a PIN/TOFU success. Dismisses the wait prompt.
+                let approvedFingerprint = awaitingApproval?.host.id == host.id
+                    ? model.connection?.hostFingerprint : nil
+                if awaitingApproval?.host.id == host.id { awaitingApproval = nil }
+                // Persist on the next runloop tick: HostStore is an ObservableObject, and mutating
+                // its @Published from inside .onChange (a view-update callback) trips SwiftUI's
+                // "Publishing changes from within view updates". A one-tick delay is imperceptible.
+                let store = store
+                DispatchQueue.main.async {
+                    store.markConnected(host.id)
+                    if let approvedFingerprint { store.pin(host.id, fingerprint: approvedFingerprint) }
+                }
+            case .idle:
+                // The delegated-approval connect failed, timed out, or was cancelled — drop the
+                // wait prompt (SessionModel surfaces any error via `errorMessage`).
+                if awaitingApproval != nil { awaitingApproval = nil }
+            default:
+                break
             }
         }
         .onDisappear { model.disconnect() } // window closed mid-session (Cmd+N spawns more)
@@ -90,6 +120,47 @@ struct ContentView: View {
             }
         }
         #endif
+        // Fresh pair=required / unknown host: offer the two ways in. An action sheet (not an
+        // alert) so it never collides with the wait alert below. "Request Access" is the no-PIN
+        // delegated-approval path; "Pair with PIN…" runs the SPAKE2 ceremony. The follow-on
+        // presentation is deferred a tick so this dialog is fully dismissed first.
+        .confirmationDialog(
+            "Pairing required",
+            isPresented: Binding(
+                get: { approvalChoice != nil },
+                set: { if !$0 { approvalChoice = nil } }),
+            titleVisibility: .visible,
+            presenting: approvalChoice
+        ) { req in
+            Button("Request Access") {
+                DispatchQueue.main.async { requestAccess(req) }
+            }
+            Button("Pair with PIN…") {
+                DispatchQueue.main.async { pairingTarget = req.host }
+            }
+            Button("Cancel", role: .cancel) {}
+        } message: { req in
+            Text("\(req.host.displayName) requires pairing. Request access and approve this "
+                + "device in the host's web console (port 3000 → Pairing) — no PIN needed. Or "
+                + "pair with the 4-digit PIN it can display.")
+        }
+        // The delegated-approval wait: the host holds the connection open until the operator
+        // approves it. Cancel returns the UI at once; the in-flight connect is left to time out
+        // and its late result is discarded by SessionModel's connect guard (disconnect resets the
+        // phase/host it checks).
+        .alert(
+            "Waiting for approval",
+            isPresented: Binding(
+                get: { awaitingApproval != nil },
+                set: { if !$0 { awaitingApproval = nil } }),
+            presenting: awaitingApproval
+        ) { _ in
+            Button("Cancel", role: .cancel) { model.disconnect() }
+        } message: { req in
+            Text("Approve \u{201C}\(localDeviceName)\u{201D} in \(req.host.displayName)'s web "
+                + "console (port 3000 → Pairing). This device connects automatically once you "
+                + "approve it — no need to reconnect.")
+        }
     }
 
     private var home: some View {
@@ -230,19 +301,32 @@ struct ContentView: View {
         // A pinned host connects on its stored fingerprint; an unpinned host may only TOFU when
         // the host's LIVE advert says `pair=optional` (rule 3a). When the caller doesn't already
         // know the policy (a saved-card tap / manual entry), resolve it from the current mDNS set:
-        // an unpinned host with no matching `pair=optional` advert routes to PIN pairing instead
+        // an unpinned host with no matching `pair=optional` advert routes to the approval choice
-        // of silently entering the trust prompt (rules 3b + 4). A pinned host ignores all of this.
+        // (request access / pair with PIN) instead of silently entering the trust prompt (rules
+        // 3b + 4). A pinned host ignores all of this.
         if host.pinnedSHA256 == nil {
             let tofuOK = allowTofu ?? discovery.hosts.contains {
                 host.matches($0) && $0.allowsTofu
             }
             if !tofuOK {
-                pairingTarget = host
+                // pair=required / unknown policy / manual entry (rule 3b): never a silent
+                // connect — offer no-PIN delegated approval or the PIN ceremony.
+                approvalChoice = ApprovalRequest(
+                    host: host, advertisedFingerprint: advertisedFingerprint(for: host))
                 return
             }
         }
-        // The gamepad-type setting resolves NOW (Automatic → match the active physical
+        startSession(host, launchID: launchID, allowTofu: host.pinnedSHA256 == nil)
-        // controller): the host's virtual pad backend is fixed per session.
+    }
+
+    /// Resolve the @AppStorage stream mode + input prefs and hand off to the session model. The
+    /// gamepad-type setting resolves NOW (Automatic → match the active physical controller): the
+    /// host's virtual pad backend is fixed per session. `requestAccess` opens the no-PIN
+    /// delegated-approval connect (host parks it until the operator approves).
+    private func startSession(
+        _ host: StoredHost, launchID: String? = nil,
+        allowTofu: Bool, requestAccess: Bool = false
+    ) {
         model.connect(
             to: host,
             width: UInt32(clamping: width), height: UInt32(clamping: height),
@@ -254,8 +338,24 @@ struct ContentView: View {
                     rawValue: UInt32(clamping: gamepadType)) ?? .auto),
             bitrateKbps: UInt32(clamping: bitrateKbps),
             audioChannels: UInt8(clamping: audioChannels),
+            hdrEnabled: hdrEnabled,
             launchID: launchID,
-            allowTofu: host.pinnedSHA256 == nil)
+            allowTofu: allowTofu,
+            requestAccess: requestAccess)
+    }
+
+    /// The no-PIN delegated-approval flow: open an identified connect the host parks until the
+    /// operator approves it in the console, showing the cancelable "Waiting for approval" prompt
+    /// meanwhile. On success the SAME connection is admitted (no reconnect) and the host is pinned
+    /// as paired (see the `.streaming` branch of `onChange`).
+    private func requestAccess(_ req: ApprovalRequest) {
+        guard !model.isBusy else { return }
+        awaitingApproval = req
+        // Pin the advertised certificate for a discovered host (impostor defence during the long
+        // wait); a manually-typed host has no advertised fingerprint, so trust-on-first-use.
+        var host = req.host
+        host.pinnedSHA256 = req.advertisedFingerprint
+        startSession(host, allowTofu: false, requestAccess: true)
     }
 
     /// Picked a title in the (experimental) library: dismiss the browser and start a session that
@@ -268,8 +368,9 @@ struct ContentView: View {
     /// Tap a discovered host: save it (so the session has a stored identity and the trust pin
     /// persists), then connect or pair per the host's advertised policy. The host is the policy
     /// authority — TOFU is offered ONLY when it explicitly advertised `pair=optional` (rule 3a);
-    /// a `pair=required` host, or one with no/unknown `pair` field, goes straight to the PIN
+    /// a `pair=required` host, or one with no/unknown `pair` field, gets the approval choice
-    /// pairing ceremony (rule 3b). (A pinned discovered host connects silently inside `connect`.)
+    /// (request access / pair with PIN) (rule 3b). (A pinned discovered host connects silently
+    /// inside `connect`.)
     private func connectDiscovered(_ d: DiscoveredHost) {
         guard !model.isBusy else { return }
         let host = StoredHost(name: d.name, address: d.host, port: d.port)
@@ -277,7 +378,9 @@ struct ContentView: View {
         if d.allowsTofu {
             connect(host, allowTofu: true)
         } else {
-            pairingTarget = host
+            // pair=required / unknown policy (rule 3b): offer no-PIN delegated approval or PIN.
+            approvalChoice = ApprovalRequest(
+                host: host, advertisedFingerprint: pinFingerprint(d.fingerprintHex))
         }
     }
 
@@ -291,6 +394,30 @@ struct ContentView: View {
         connect(pinned)
     }
 
+    /// The certificate fingerprint a live mDNS advert carries for this saved host (advisory — see
+    /// `HostDiscovery`), to pin during a delegated-approval wait. nil if the host isn't currently
+    /// advertising or advertised no/invalid `fp`.
+    private func advertisedFingerprint(for host: StoredHost) -> Data? {
+        pinFingerprint(discovery.hosts.first { host.matches($0) }?.fingerprintHex)
+    }
+
+    /// Parse an advertised cert fingerprint (lowercase hex) into the 32-byte pin the connect
+    /// expects; nil unless it's exactly a 32-byte (SHA-256) value, so a malformed advert falls
+    /// back to trust-on-first-use rather than failing the connect closed.
+    private func pinFingerprint(_ hex: String?) -> Data? {
+        guard let hex, let data = Data(hexString: hex), data.count == 32 else { return nil }
+        return data
+    }
+
+    /// How the host lists this device in its approval prompt (matches PairSheet's client name).
+    private var localDeviceName: String {
+        #if os(macOS)
+        Host.current().localizedName ?? "Mac"
+        #else
+        UIDevice.current.name
+        #endif
+    }
+
     // MARK: - First-run + dev hooks
 
     /// First run on iOS: default the stream mode to this device's native screen so the
@@ -354,6 +481,7 @@ struct ContentView: View {
             gamepad: pad,
             bitrateKbps: bitrate,
             audioChannels: UInt8(clamping: audioChannels),
+            hdrEnabled: hdrEnabled,
             autoTrust: true)
     }
 }
@@ -378,3 +506,31 @@ private struct FullscreenController: NSViewRepresentable {
     }
 }
 #endif
+
+/// A fresh `pair=required`/unknown host pending a trust decision: drives both the "request access
+/// vs. pair with PIN" choice and the subsequent approval wait. `advertisedFingerprint` is the
+/// discovered host's advertised cert (nil for a manually-typed host → trust-on-first-use).
+private struct ApprovalRequest {
+    let host: StoredHost
+    let advertisedFingerprint: Data?
+}
+
+private extension Data {
+    /// Parse an even-length hex string into bytes; nil on any non-hex character or odd length.
+    /// Used to turn an mDNS-advertised cert fingerprint into a connect pin.
+    init?(hexString: String) {
+        let chars = Array(hexString)
+        guard chars.count.isMultiple(of: 2) else { return nil }
+        var bytes = [UInt8]()
+        bytes.reserveCapacity(chars.count / 2)
+        var i = 0
+        while i < chars.count {
+            guard let hi = chars[i].hexDigitValue, let lo = chars[i + 1].hexDigitValue else {
+                return nil
+            }
+            bytes.append(UInt8(hi << 4 | lo))
+            i += 2
+        }
+        self = Data(bytes)
+    }
+}

clients/apple/Sources/PunktfunkClient/ControllerTestView.swift

@@ -54,7 +54,7 @@ struct ControllerTestView: View {
     var body: some View {
         VStack(spacing: 0) {
             HStack {
-                Text("Test Controller").font(.headline)
+                Text("Test Controller").font(.geist(17, .semibold, relativeTo: .headline))
                 Spacer()
                 Button("Done") { dismiss() }.keyboardShortcut(.cancelAction)
             }
@@ -99,8 +99,8 @@ struct ControllerTestView: View {
                 .font(.title2)
                 .foregroundStyle(.secondary)
             VStack(alignment: .leading, spacing: 2) {
-                Text(c.name).font(.headline)
+                Text(c.name).font(.geist(17, .semibold, relativeTo: .headline))
-                Text(c.productCategory).font(.caption).foregroundStyle(.secondary)
+                Text(c.productCategory).font(.geist(12, relativeTo: .caption)).foregroundStyle(.secondary)
             }
             Spacer()
         }
@@ -209,7 +209,7 @@ struct ControllerTestView: View {
     ) -> some View {
         VStack(alignment: .leading, spacing: 4) {
             Text("Touchpad\(tp.button.isPressed ? " — click" : "")")
-                .font(.caption2).foregroundStyle(.secondary)
+                .font(.geist(11, relativeTo: .caption2)).foregroundStyle(.secondary)
             ZStack {
                 RoundedRectangle(cornerRadius: 8).stroke(Color.secondary.opacity(0.3))
                 fingerDot(tp.primary, color: .accentColor)
@@ -230,7 +230,7 @@ struct ControllerTestView: View {
     private func motionReadout(_ m: GCMotion) -> some View {
         let a = Self.totalAccel(m)
         return VStack(alignment: .leading, spacing: 2) {
-            Text("Motion").font(.caption2).foregroundStyle(.secondary)
+            Text("Motion").font(.geist(11, relativeTo: .caption2)).foregroundStyle(.secondary)
             Text(String(format: "gyro  %+.2f %+.2f %+.2f",
                         m.rotationRate.x, m.rotationRate.y, m.rotationRate.z))
                 .font(.caption2.monospaced())
@@ -254,11 +254,11 @@ struct ControllerTestView: View {
                 Toggle("Heavy motor (left)", isOn: $heavyOn)
                 Toggle("Light motor (right)", isOn: $lightOn)
                 Label("Backend: \(tester.rumbleBackend)", systemImage: "waveform")
-                    .font(.caption).foregroundStyle(.secondary)
+                    .font(.geist(12, relativeTo: .caption)).foregroundStyle(.secondary)
                 Text("Toggle a motor to feel it. The host maps a game's low/high-frequency "
                     + "rumble onto these two. A DualSense is driven over raw HID (CoreHaptics "
                     + "can't reach its motors on macOS).")
-                    .font(.caption).foregroundStyle(.secondary)
+                    .font(.geist(12, relativeTo: .caption)).foregroundStyle(.secondary)
             }
             .onChange(of: heavyOn) { _, _ in applyRumble() }
             .onChange(of: lightOn) { _, _ in applyRumble() }
@@ -289,11 +289,11 @@ struct ControllerTestView: View {
                         }
                     }
                     Text("Pick an effect, then pull L2/R2 to feel the resistance.")
-                        .font(.caption).foregroundStyle(.secondary)
+                        .font(.geist(12, relativeTo: .caption)).foregroundStyle(.secondary)
                 }
             } else {
                 Text("Adaptive triggers need a DualSense.")
-                    .font(.caption).foregroundStyle(.secondary)
+                    .font(.geist(12, relativeTo: .caption)).foregroundStyle(.secondary)
             }
         }
     }
@@ -348,7 +348,7 @@ struct ControllerTestView: View {
         _ title: String, @ViewBuilder _ content: () -> Content
     ) -> some View {
         VStack(alignment: .leading, spacing: 10) {
-            Text(title).font(.subheadline.weight(.semibold))
+            Text(title).font(.geist(15, .semibold, relativeTo: .subheadline))
             content()
         }
         .frame(maxWidth: .infinity, alignment: .leading)

clients/apple/Sources/PunktfunkClient/HomeView.swift

@@ -127,14 +127,13 @@ struct HomeView: View {
             AddHostSheet { store.add($0) }
         }
         #if os(iOS)
+        // SettingsView owns its own NavigationSplitView (sidebar + detail) and Done button, so it
+        // is presented directly — wrapping it in a NavigationStack here would nest a split view in
+        // a stack (double title bars). `settingsSheetSizing()` widens the sheet on iPad for the
+        // two-column layout.
         .sheet(isPresented: $showSettings) {
-            NavigationStack {
+            SettingsView()
-                SettingsView()
+                .settingsSheetSizing()
-                    .navigationTitle("Settings")
-                    .toolbar {
-                        Button("Done") { showSettings = false }
-                    }
-            }
         }
         #endif
         #endif
@@ -172,7 +171,7 @@ struct HomeView: View {
     private var discoveredSection: some View {
         VStack(alignment: .leading, spacing: 10) {
             Label("On this network", systemImage: "antenna.radiowaves.left.and.right")
-                .font(.headline)
+                .font(.geist(15, .semibold, relativeTo: .headline))
                 .foregroundStyle(.secondary)
                 .padding(.horizontal)
             LazyVGrid(columns: gridColumns, spacing: gridSpacing) {
@@ -249,8 +248,10 @@ struct HomeView: View {
     /// the width so the cards stay edge-aligned with the title and bars — sized touch-first: one
     /// column on iPhone portrait, 3–4 generous cards on iPad.
     private var gridColumns: [GridItem] {
+        // Wider than before: the monogram card is a horizontal module (tile + address line), so
+        // it needs room for a monospaced "IP:port" without truncating.
         #if os(macOS)
-        [GridItem(.adaptive(minimum: 180, maximum: 240), spacing: 16)]
+        [GridItem(.adaptive(minimum: 250, maximum: 320), spacing: 16)]
         #elseif os(tvOS)
         [GridItem(.adaptive(minimum: 320), spacing: 48)]
         #else

clients/apple/Sources/PunktfunkClient/HostCards.swift

@@ -1,26 +1,75 @@
 // The host grid's cards: a saved host (tap to connect, context menu) and an mDNS-discovered
-// host (tap to save + connect). Both share the same platform-tuned sizing.
+// host (tap to save + connect). Both share the "monogram module" look — a squared brand-purple
+// monogram tile + a left-aligned bold Geist name over monospaced technical metadata
+// (address, status), framed by a hairline panel border. Industrial, not soft.
 
 import PunktfunkKit
 import SwiftUI
 
-/// Shared host-card sizing — touch-first on iOS, compact on macOS/tvOS.
+/// Shared host-card sizing — touch-first on iOS, compact on macOS, roomy on tvOS.
 private struct CardMetrics {
-    let iconSize: CGFloat
+    let tile: CGFloat       // monogram tile side
-    let iconBox: CGFloat
+    let monogram: CGFloat   // monogram letter point size
-    let cardPadding: CGFloat
+    let name: CGFloat       // host-name point size
-    let nameFont: Font
+    let meta: CGFloat       // address (mono) point size
+    let status: CGFloat     // status-label (mono) point size
+    let padding: CGFloat
+    let spacing: CGFloat    // tile ↔ text gap
+    let radius: CGFloat
 
     static var current: CardMetrics {
         #if os(iOS)
-        CardMetrics(iconSize: 56, iconBox: 76, cardPadding: 28, nameFont: .title3.weight(.semibold))
+        CardMetrics(tile: 54, monogram: 26, name: 19, meta: 13, status: 11,
+                    padding: 16, spacing: 14, radius: 12)
+        #elseif os(tvOS)
+        CardMetrics(tile: 64, monogram: 32, name: 24, meta: 16, status: 14,
+                    padding: 18, spacing: 18, radius: 14)
         #else
-        CardMetrics(iconSize: 42, iconBox: 56, cardPadding: 18, nameFont: .headline)
+        CardMetrics(tile: 44, monogram: 21, name: 15, meta: 12, status: 10.5,
+                    padding: 13, spacing: 12, radius: 10)
         #endif
     }
 }
 
-/// A saved host. The accent ring marks the most-recently-connected one; the context menu
+/// First letter of a host name, uppercased — the monogram glyph. Falls back to a bullet.
+private func monogram(_ name: String) -> String {
+    guard let first = name.trimmingCharacters(in: .whitespacesAndNewlines).first else { return "•" }
+    return String(first).uppercased()
+}
+
+/// The squared monogram tile. `filled` = a solid brand-purple chip (saved hosts); otherwise a
+/// tinted outline (discovered hosts). Shows a spinner in place of the glyph while connecting.
+private func monogramTile(_ letter: String, m: CardMetrics, connecting: Bool, filled: Bool) -> some View {
+    let shape = RoundedRectangle(cornerRadius: m.radius - 3, style: .continuous)
+    return ZStack {
+        shape.fill(filled
+            ? AnyShapeStyle(LinearGradient(
+                colors: [Color.brand, Color.brand.opacity(0.72)],
+                startPoint: .top, endPoint: .bottom))
+            : AnyShapeStyle(Color.brand.opacity(0.14)))
+        if connecting {
+            ProgressView().tint(filled ? .white : Color.brand)
+        } else {
+            // Fixed size (not Dynamic Type): the glyph is pinned inside a fixed tile, so it must
+            // not scale up and spill out at large accessibility text sizes. minimumScaleFactor +
+            // the clip below are belt-and-suspenders for an unusually wide glyph.
+            Text(letter)
+                .font(.geistFixed(m.monogram, .bold))
+                .minimumScaleFactor(0.5)
+                .lineLimit(1)
+                .foregroundStyle(filled ? Color.white : Color.brand)
+        }
+    }
+    .frame(width: m.tile, height: m.tile)
+    .clipShape(shape)
+    .overlay {
+        if !filled {
+            shape.strokeBorder(Color.brand.opacity(0.45), lineWidth: 1)
+        }
+    }
+}
+
+/// A saved host. A left accent bar marks the most-recently-connected one; the context menu
 /// pairs / speed-tests / forgets / removes. Disabled while a session is busy.
 struct HostCardView: View {
     let host: StoredHost
@@ -41,66 +90,44 @@ struct HostCardView: View {
     var body: some View {
         let m = CardMetrics.current
         return Button(action: onConnect) {
-            VStack(spacing: 10) {
+            HStack(spacing: m.spacing) {
-                ZStack {
+                monogramTile(monogram(host.displayName), m: m, connecting: isConnecting, filled: true)
-                    Image(systemName: "play.display")
+                VStack(alignment: .leading, spacing: 4) {
-                        .font(.system(size: m.iconSize, weight: .light))
+                    Text(host.displayName)
-                        .foregroundStyle(.tint)
+                        .font(.geist(m.name, .bold, relativeTo: .title3))
-                        .opacity(isConnecting ? 0.3 : 1)
+                        .foregroundStyle(.primary)
-                    if isConnecting {
+                        .lineLimit(1)
-                        ProgressView()
+                    Text("\(host.address):\(String(host.port))")
-                    }
+                        .font(.geist(m.meta, relativeTo: .caption))
+                        .foregroundStyle(.secondary)
+                        .lineLimit(1)
+                    statusRow(m)
                 }
-                .frame(height: m.iconBox)
+                Spacer(minLength: 0)
-                VStack(spacing: 2) {
+            }
-                    HStack(spacing: 6) {
+            .padding(m.padding)
-                        // Presence dot: green = advertising on the LAN now; grey = not seen.
+            .frame(maxWidth: .infinity, alignment: .leading)
-                        Circle()
+            #if !os(tvOS)
-                            .fill(isOnline ? Color.green : Color.secondary.opacity(0.35))
+            // tvOS: the .card button style owns platter + focus motion; extra chrome mutes it.
-                            .frame(width: 7, height: 7)
+            // Elsewhere: a flat material panel with a hairline border (industrial, not a soft blob),
-                            .accessibilityLabel(isOnline ? "Online" : "Offline")
+            // and a brand accent bar down the leading edge for the most-recent host.
-                        Text(host.displayName)
+            .background(.regularMaterial)
-                            .font(m.nameFont)
+            .overlay(alignment: .leading) {
-                            .lineLimit(1)
+                if isMostRecent {
-                    }
+                    Rectangle().fill(Color.brand).frame(width: 3)
-                    HStack(spacing: 4) {
-                        if host.pinnedSHA256 != nil {
-                            Image(systemName: "lock.fill")
-                                .font(.system(size: 9))
-                                .foregroundStyle(.secondary)
-                        }
-                        Text("\(host.address):\(String(host.port))")
-                            .font(.caption)
-                            .foregroundStyle(.secondary)
-                            .lineLimit(1)
-                    }
-                    if let last = host.lastConnected {
-                        Text("Connected \(last, format: .relative(presentation: .named))")
-                            .font(.caption2)
-                            .foregroundStyle(.tertiary)
-                            .lineLimit(1)
-                    }
                 }
             }
-            .frame(maxWidth: .infinity)
+            .clipShape(RoundedRectangle(cornerRadius: m.radius, style: .continuous))
-            .padding(.vertical, m.cardPadding)
-            .padding(.horizontal, 12)
-            #if !os(tvOS)
-            // tvOS: the .card button style owns platter + focus motion — extra chrome
-            // inside it mutes the grow/tilt. Material + accent ring are for pointer UIs.
-            // Deliberately .regularMaterial, not Liquid Glass: HIG keeps glass off content
-            // tiles (it flattens hierarchy over an opaque grid) — see GlassStyle.swift.
-            .background(.regularMaterial, in: RoundedRectangle(cornerRadius: 14))
             .overlay {
-                if isMostRecent {
+                RoundedRectangle(cornerRadius: m.radius, style: .continuous)
-                    RoundedRectangle(cornerRadius: 14)
+                    .strokeBorder(.quaternary, lineWidth: 1)
-                        .strokeBorder(Color.accentColor.opacity(0.35), lineWidth: 1.5)
-                }
             }
             #endif
         }
         #if os(tvOS)
         .buttonStyle(.card)
+        #elseif os(iOS)
+        .buttonStyle(HostCardButtonStyle(cornerRadius: m.radius))
         #else
         .buttonStyle(.plain)
         #endif
@@ -119,10 +146,31 @@ struct HostCardView: View {
             Button("Remove", role: .destructive, action: onRemove)
         }
     }
+
+    /// Technical status line: a square presence pip + monospaced ONLINE/OFFLINE, and PAIRED when a
+    /// certificate is pinned (the lock state, spelled out).
+    @ViewBuilder private func statusRow(_ m: CardMetrics) -> some View {
+        HStack(spacing: 6) {
+            RoundedRectangle(cornerRadius: 1.5)
+                .fill(isOnline ? Color.green : Color.secondary.opacity(0.4))
+                .frame(width: 6, height: 6)
+                // The state is spelled out in the adjacent text, so the pip is decorative —
+                // otherwise VoiceOver reads the status twice ("Online, ONLINE …").
+                .accessibilityHidden(true)
+            Text(isOnline ? "ONLINE" : "OFFLINE")
+            if host.pinnedSHA256 != nil {
+                Text("· PAIRED")
+            }
+        }
+        .font(.geist(m.status, .medium, relativeTo: .caption2))
+        .tracking(0.8)
+        .foregroundStyle(.secondary)
+        .lineLimit(1)
+    }
 }
 
-/// A host found on the LAN but not yet saved. A dashed ring distinguishes it from saved cards;
+/// A host found on the LAN but not yet saved. A tinted-outline monogram + dashed panel border
-/// tapping saves it and connects (or pairs, if the host requires it).
+/// distinguish it from saved cards; tapping saves it and connects (or pairs, if required).
 struct DiscoveredCardView: View {
     let discovered: DiscoveredHost
     let isBusy: Bool
@@ -131,47 +179,77 @@ struct DiscoveredCardView: View {
     var body: some View {
         let m = CardMetrics.current
         return Button(action: onConnect) {
-            VStack(spacing: 10) {
+            HStack(spacing: m.spacing) {
-                Image(systemName: "play.display")
+                monogramTile(monogram(discovered.name), m: m, connecting: false, filled: false)
-                    .font(.system(size: m.iconSize, weight: .light))
+                VStack(alignment: .leading, spacing: 4) {
-                    .foregroundStyle(.tint)
-                    .frame(height: m.iconBox)
-                VStack(spacing: 2) {
                     Text(discovered.name)
-                        .font(m.nameFont)
+                        .font(.geist(m.name, .bold, relativeTo: .title3))
+                        .foregroundStyle(.primary)
                         .lineLimit(1)
-                    HStack(spacing: 4) {
+                    Text("\(discovered.host):\(String(discovered.port))")
-                        Image(systemName: discovered.requiresPairing ? "lock.fill" : "wifi")
+                        .font(.geist(m.meta, relativeTo: .caption))
-                            .font(.system(size: 9))
+                        .foregroundStyle(.secondary)
-                            .foregroundStyle(.secondary)
+                        .lineLimit(1)
-                        Text("\(discovered.host):\(String(discovered.port))")
+                    HStack(spacing: 6) {
-                            .font(.caption)
+                        Image(systemName: discovered.requiresPairing
-                            .foregroundStyle(.secondary)
+                            ? "lock.fill" : "antenna.radiowaves.left.and.right")
-                            .lineLimit(1)
+                            .font(.system(size: m.status))
+                            .accessibilityHidden(true) // decorative; the adjacent text says the state
+                        Text(discovered.requiresPairing ? "PAIRING REQUIRED" : "DISCOVERED")
                     }
-                    Text(discovered.requiresPairing ? "Pairing required" : "Discovered")
+                    .font(.geist(m.status, .medium, relativeTo: .caption2))
-                        .font(.caption2)
+                    .tracking(0.8)
-                        .foregroundStyle(.tertiary)
+                    .foregroundStyle(.secondary)
+                    .lineLimit(1)
                 }
+                Spacer(minLength: 0)
             }
-            .frame(maxWidth: .infinity)
+            .padding(m.padding)
-            .padding(.vertical, m.cardPadding)
+            .frame(maxWidth: .infinity, alignment: .leading)
-            .padding(.horizontal, 12)
             #if !os(tvOS)
-            .background(.regularMaterial, in: RoundedRectangle(cornerRadius: 14))
+            .background(.regularMaterial)
+            .clipShape(RoundedRectangle(cornerRadius: m.radius, style: .continuous))
             .overlay {
-                RoundedRectangle(cornerRadius: 14)
+                RoundedRectangle(cornerRadius: m.radius, style: .continuous)
                     .strokeBorder(
-                        Color.secondary.opacity(0.25),
+                        Color.secondary.opacity(0.3),
                         style: StrokeStyle(lineWidth: 1, dash: [4, 3]))
             }
             #endif
         }
         #if os(tvOS)
         .buttonStyle(.card)
+        #elseif os(iOS)
+        .buttonStyle(HostCardButtonStyle(cornerRadius: m.radius))
         #else
         .buttonStyle(.plain)
         #endif
         .disabled(isBusy)
     }
 }
+
+#if os(iOS)
+/// The iOS host-card press/hover treatment, one style for both idioms:
+/// - iPhone: a subtle scale-down on press + a light impact haptic on press-down. (`hoverEffect` is
+///   inert without a pointer.)
+/// - iPad: the system pointer "magnet" — the cursor morphs into a highlight that conforms to the
+///   card's rounded rect on hover. (`sensoryFeedback` is inert without a Taptic Engine, and the
+///   press scale doubles as click feedback.)
+struct HostCardButtonStyle: ButtonStyle {
+    var cornerRadius: CGFloat
+
+    func makeBody(configuration: Configuration) -> some View {
+        configuration.label
+            .scaleEffect(configuration.isPressed ? 0.96 : 1)
+            .animation(.spring(response: 0.3, dampingFraction: 0.65), value: configuration.isPressed)
+            // Conform the pointer highlight to the card's rounded rect, not its square bounds.
+            .contentShape(.hoverEffect, RoundedRectangle(cornerRadius: cornerRadius, style: .continuous))
+            .hoverEffect(.highlight)
+            // Light tap on press-down (nil on release so it fires once, on touch). No haptic
+            // hardware on iPad → silently ignored there.
+            .sensoryFeedback(trigger: configuration.isPressed) { _, pressed in
+                pressed ? .impact(weight: .light) : nil
+            }
+    }
+}
+#endif

clients/apple/Sources/PunktfunkClient/LibraryView.swift

@@ -146,7 +146,7 @@ private struct GameCard: View {
                 .clipShape(RoundedRectangle(cornerRadius: 10, style: .continuous))
                 .overlay(alignment: .topLeading) { storeBadge }
             Text(game.title)
-                .font(.caption)
+                .font(.geist(12, relativeTo: .caption))
                 .lineLimit(2)
                 .foregroundStyle(.secondary)
         }
@@ -154,7 +154,7 @@ private struct GameCard: View {
 
     private var storeBadge: some View {
         Text(game.isCustom ? "Custom" : "Steam")
-            .font(.caption2.weight(.semibold))
+            .font(.geist(11, .semibold, relativeTo: .caption2))
             .padding(.horizontal, 6)
             .padding(.vertical, 3)
             .background(.ultraThinMaterial, in: Capsule())
@@ -193,7 +193,7 @@ private struct PosterImage: View {
         ZStack {
             Rectangle().fill(.quaternary)
             Text(title)
-                .font(.headline)
+                .font(.geist(17, .semibold, relativeTo: .headline))
                 .multilineTextAlignment(.center)
                 .foregroundStyle(.secondary)
                 .padding(8)

clients/apple/Sources/PunktfunkClient/PairSheet.swift

@@ -48,7 +48,7 @@ struct PairSheet: View {
                 + "(http://<host>:3000 → Pairing). "
                 + "Pairing verifies both sides at once — no fingerprint comparison "
                 + "needed.")
-                .font(.callout)
+                .font(.geist(16, relativeTo: .callout))
                 .foregroundStyle(.secondary)
                 .multilineTextAlignment(.center)
             TVFieldRow(
@@ -59,7 +59,7 @@ struct PairSheet: View {
             ) { editing = .clientName }
             if let errorText {
                 Text(errorText)
-                    .font(.callout)
+                    .font(.geist(16, relativeTo: .callout))
                     .foregroundStyle(.red)
             }
             HStack(spacing: 32) {
@@ -121,13 +121,13 @@ struct PairSheet: View {
                         + "(http://<host>:3000 → Pairing). "
                         + "Pairing verifies both sides at once — no fingerprint "
                         + "comparison needed.")
-                        .font(.caption)
+                        .font(.geist(12, relativeTo: .caption))
                         .foregroundStyle(.secondary)
                 }
                 if let errorText {
                     Section {
                         Text(errorText)
-                            .font(.callout)
+                            .font(.geist(16, relativeTo: .callout))
                             .foregroundStyle(.red)
                     }
                 }

clients/apple/Sources/PunktfunkClient/PunktfunkClientApp.swift

@@ -12,20 +12,36 @@ struct PunktfunkClientApp: App {
     @NSApplicationDelegateAdaptor(AppDelegate.self) private var appDelegate
     #endif
 
+    init() {
+        #if os(iOS)
+        // Put Geist on the navigation titles before any bar is built.
+        BrandTheme.apply()
+        #endif
+    }
+
     var body: some Scene {
         WindowGroup("Punktfunk") {
-            #if DEBUG
+            // Pin the whole app's tint to the brand purple explicitly — the asset-catalog accent
-            // PUNKTFUNK_SHOT_SCENE=<name> → show that single mock-populated screen full-bleed for
+            // resolution is environment/timing-sensitive and can fall back to system blue. Wraps the
-            // the App Store screenshot capture (tools/screenshots.sh). Normal launch otherwise;
+            // screenshot harness too, so captured screens are on-brand.
-            // the whole path is absent from Release builds.
+            Group {
-            if let scene = ScreenshotMode.requestedScene {
+                #if DEBUG
-                ScreenshotHostView(scene: scene)
+                // PUNKTFUNK_SHOT_SCENE=<name> → show that single mock-populated screen full-bleed for
-            } else {
+                // the App Store screenshot capture (tools/screenshots.sh). Normal launch otherwise;
+                // the whole path is absent from Release builds.
+                if let scene = ScreenshotMode.requestedScene {
+                    ScreenshotHostView(scene: scene)
+                } else {
+                    ContentView()
+                }
+                #else
                 ContentView()
+                #endif
             }
-            #else
+            .tint(.brand)
-            ContentView()
+            // Geist Sans is the app's typeface. This sets the default for unstyled text and the
-            #endif
+            // form row labels; views that pick an explicit size/weight use `.geist(…)` directly.
+            .font(.geist(17, relativeTo: .body))
         }
         // The Stream menu (Disconnect ⌘D, Show/Hide Statistics ⌘⇧S) — a real menu bar on
         // macOS, hardware-keyboard shortcuts on iPad. tvOS has neither.
@@ -34,7 +50,10 @@ struct PunktfunkClientApp: App {
         #endif
         #if os(macOS)
         Settings {
+            // A separate scene — `.tint` does not cross scene boundaries, so re-apply the brand
+            // tint here or the Preferences window falls back to the (unreliable) asset accent.
             SettingsView()
+                .tint(.brand)
         }
         #endif
     }

clients/apple/Sources/PunktfunkClient/Screenshots/ScreenshotScenes.swift

@@ -103,11 +103,11 @@ private struct ShotSettings: View {
                 .shadow(radius: 40, y: 16)
         }
         #elseif os(iOS)
-        NavigationStack {
+        // SettingsView owns its NavigationSplitView (sidebar + detail) and Done button, so it is
-            SettingsView()
+        // rendered directly — a wrapping NavigationStack would nest a split view in a stack. Open
-                .navigationTitle("Settings")
+        // on General so the shot lands on real controls (iPad: sidebar + General detail; iPhone:
-                .navigationBarTitleDisplayMode(.inline)
+        // the General page) instead of the bare category list.
-        }
+        SettingsView(initialCategory: .general)
         #else
         NavigationStack { SettingsView() }
         #endif
@@ -175,10 +175,10 @@ private struct ShotHUD: View {
                 .foregroundStyle(.secondary)
             #if os(macOS)
             Text("⌘⎋ releases the mouse")
-                .font(.caption2).foregroundStyle(.secondary)
+                .font(.geist(11, relativeTo: .caption2)).foregroundStyle(.secondary)
             #elseif os(tvOS)
             Text("Press Menu to disconnect")
-                .font(.caption).foregroundStyle(.secondary)
+                .font(.geist(12, relativeTo: .caption)).foregroundStyle(.secondary)
             #endif
         }
         .padding(10)
@@ -259,7 +259,7 @@ private struct ShotDesktopFrame: View {
             HStack(spacing: 8) {
                 Image(systemName: "gamecontroller.fill")
                 Text("Streaming from Battlestation")
-                    .font(.system(.callout, weight: .semibold))
+                    .font(.geist(16, .semibold, relativeTo: .callout))
             }
             .padding(.horizontal, 14).padding(.vertical, 9)
             .glassBackground(Capsule())

clients/apple/Sources/PunktfunkClient/SessionModel.swift

@@ -95,6 +95,13 @@ final class SessionModel: ObservableObject {
     /// field — TOFU is forbidden (rule 3b): the connect refuses rather than offering trust, and
     /// the user is routed to PIN pairing by the caller. (A pinned host connects regardless: its
     /// stored fingerprint is the trust decision.)
+    ///
+    /// `requestAccess` is the no-PIN delegated-approval path: open an identified connect the host
+    /// PARKS until the operator clicks Approve in its console, then admits the SAME connection (no
+    /// reconnect). The handshake budget is widened to exceed the host's park window, and a
+    /// successful connect streams directly (the approval IS the trust decision) — the caller pins
+    /// the observed fingerprint as paired. `host.pinnedSHA256`, when set, pins the advertised cert
+    /// for the wait; nil = trust-on-first-use.
     func connect(to host: StoredHost, width: UInt32, height: UInt32, hz: UInt32,
                  compositor: PunktfunkConnection.Compositor = .auto,
                  gamepad: PunktfunkConnection.GamepadType = .auto,
@@ -103,7 +110,8 @@ final class SessionModel: ObservableObject {
                  hdrEnabled: Bool = true,
                  launchID: String? = nil,
                  allowTofu: Bool = false,
-                 autoTrust: Bool = false) {
+                 autoTrust: Bool = false,
+                 requestAccess: Bool = false) {
         guard phase == .idle else { return }
         phase = .connecting
         activeHost = host
@@ -121,6 +129,8 @@ final class SessionModel: ObservableObject {
             #endif
         }()
         let hdrCapable = hdrEnabled && displayHDR
+        // 4:4:4 opt-out (default on); the hardware-decode probe below is the real gate.
+        let want444 = (UserDefaults.standard.object(forKey: DefaultsKey.enable444) as? Bool) ?? true
         Task.detached(priority: .userInitiated) {
             // PunktfunkConnection.init blocks on the QUIC handshake — keep it off the main
             // actor. The persistent identity is presented on every connect so a paired
@@ -130,15 +140,31 @@ final class SessionModel: ObservableObject {
             // Advertise 10-bit + HDR10 when enabled: the host upgrades to a BT.2020 PQ Main10 stream
             // only for actual HDR content (its own gate); the VideoToolbox/Metal present path is
             // HDR-capable (P010 + itur_2100_PQ + EDR). 0 keeps the 8-bit BT.709 SDR stream.
-            let videoCaps: UInt8 = hdrCapable
+            var videoCaps: UInt8 = hdrCapable
                 ? (PunktfunkConnection.videoCap10Bit | PunktfunkConnection.videoCapHDR)
                 : 0
+            // Advertise full-chroma 4:4:4 only when allowed AND this device can HARDWARE-decode it
+            // (software 4:4:4 is too slow for real-time). The host content-gates depth, so an
+            // HDR-advertised session can still receive an 8-bit 4:4:4 stream (SDR content) — require
+            // BOTH depths there. Otherwise a no-op (the host emits 4:4:4 only if it too opted in);
+            // `chromaFormat` on the connection reflects what was actually resolved.
+            let canDecode444 =
+                hdrCapable
+                ? (Stage444Probe.hwDecode444_8bit && Stage444Probe.hwDecode444_10bit)
+                : Stage444Probe.hwDecode444_8bit
+            if want444, canDecode444 {
+                videoCaps |= PunktfunkConnection.videoCap444
+            }
             let result = Result { try PunktfunkConnection(
                 host: host.address, port: host.port,
                 width: width, height: height, refreshHz: hz,
                 pinSHA256: pin, identity: identity, compositor: compositor,
                 gamepad: gamepad, bitrateKbps: bitrateKbps, videoCaps: videoCaps,
-                audioChannels: audioChannels, launchID: launchID) }
+                audioChannels: audioChannels, launchID: launchID,
+                // Delegated approval: the host holds this connect open until the operator approves
+                // it (~180 s) — outwait that window so a slow approval still lands here. Normal
+                // connects keep the snappy default.
+                timeoutMs: requestAccess ? 185_000 : 10_000) }
             await MainActor.run { [weak self] in
                 guard let self else { return }
                 // The user may have abandoned this attempt (window closed, another host
@@ -152,7 +178,9 @@ final class SessionModel: ObservableObject {
                 }
                 switch result {
                 case .success(let conn):
-                    if pin != nil || autoTrust {
+                    if pin != nil || autoTrust || requestAccess {
+                        // requestAccess: the operator approved this device on the host, so the
+                        // session is trusted — stream directly (the caller pins it as paired).
                         self.connection = conn
                         self.startStatsTimer()
                         self.beginStreaming()
@@ -174,16 +202,25 @@ final class SessionModel: ObservableObject {
                 case .failure:
                     self.phase = .idle
                     self.activeHost = nil
-                    self.errorMessage = pin != nil
+                    if requestAccess {
-                        ? "Could not connect to \(host.displayName) — host unreachable, "
+                        // The delegated-approval connect ended without being admitted: the
-                            + "not running, its identity no longer matches the pinned "
+                        // operator didn't approve it before the host's park window elapsed (or
-                            + "fingerprint, or it requires pairing and no longer "
+                        // the host was unreachable).
-                            + "recognizes this Mac (right-click the host card to pair "
+                        self.errorMessage = "\(host.displayName) didn't let this device in. "
-                            + "again)."
+                            + "Approve it in the host's web console (port 3000 → Pairing), then "
-                        : "Could not connect to \(host.displayName) — is punktfunk-host "
+                            + "request access again — the request expires after a few minutes."
-                            + "running on \(host.address):\(host.port)? If it requires "
+                    } else {
-                            + "pairing, right-click the host card and pair with its PIN "
+                        self.errorMessage = pin != nil
-                            + "first."
+                            ? "Could not connect to \(host.displayName) — host unreachable, "
+                                + "not running, its identity no longer matches the pinned "
+                                + "fingerprint, or it requires pairing and no longer "
+                                + "recognizes this Mac (right-click the host card to pair "
+                                + "again)."
+                            : "Could not connect to \(host.displayName) — is punktfunk-host "
+                                + "running on \(host.address):\(host.port)? If it requires "
+                                + "pairing, right-click the host card and pair with its PIN "
+                                + "first."
+                    }
                 }
             }
         }

clients/apple/Sources/PunktfunkClient/SettingsView.swift

@@ -1,10 +1,12 @@
 // App settings. The host creates a native virtual output at exactly the chosen size/refresh —
 // there is no scaling anywhere in the pipeline.
 //
-// Navigation differs per platform: macOS uses a tabbed preferences window (the sections had
+// Navigation differs per platform, but all three group the same categories (General, Display,
-// outgrown one scrolling pane); iOS uses a single grouped Form; tvOS uses a focus-native
+// Audio, Controllers, Advanced, About): macOS uses a tabbed preferences window; iOS/iPadOS uses
-// pushed-picker layout. The individual sections (`streamModeSection`, `audioSection`, …) are
+// an adaptive NavigationSplitView — a category sidebar + detail pane on iPad, auto-collapsing to
-// shared across all three so a setting is defined exactly once.
+// a hierarchical push list on iPhone (the system Settings idiom on each); tvOS uses a
+// focus-native pushed-picker layout. The individual sections (`streamModeSection`,
+// `audioSection`, …) are shared across all three so a setting is defined exactly once.
 
 #if os(macOS)
 import AppKit
@@ -21,7 +23,9 @@ struct SettingsView: View {
     @AppStorage(DefaultsKey.compositor) private var compositor = 0
     @AppStorage(DefaultsKey.gamepadType) private var gamepadType = 0
     @AppStorage(DefaultsKey.bitrateKbps) private var bitrateKbps = 0
-    @AppStorage(DefaultsKey.presenter) private var presenter = "stage1"
+    @AppStorage(DefaultsKey.presenter) private var presenter = "stage2"
+    @AppStorage(DefaultsKey.hdrEnabled) private var hdrEnabled = true
+    @AppStorage(DefaultsKey.enable444) private var enable444 = true
     @AppStorage(DefaultsKey.libraryEnabled) private var libraryEnabled = false
     @AppStorage(DefaultsKey.fullscreenWhileStreaming) private var fullscreenWhileStreaming = true
     @AppStorage(DefaultsKey.micEnabled) private var micEnabled = true
@@ -32,6 +36,22 @@ struct SettingsView: View {
     #if DEBUG && !os(tvOS)
     @State private var showControllerTest = false
     #endif
+    #if os(iOS)
+    @AppStorage(DefaultsKey.pointerCapture) private var pointerCapture = true
+    // The sidebar selection drives the detail pane on iPad and the pushed sub-page on iPhone.
+    // Width class decides the initial value: nil on iPhone (show the category list first),
+    // General on iPad (a two-column layout should never open with an empty detail).
+    @Environment(\.horizontalSizeClass) private var horizontalSizeClass
+    @State private var settingsSelection: SettingsCategory?
+    // Tracked so the detail can show its own Done whenever the sidebar (and its Done) is off screen
+    // — not just on iPhone, but on any iPad layout that collapses the sidebar to an overlay. Starts
+    // .doubleColumn so iPad reliably opens with the sidebar (and its Done) visible.
+    @State private var columnVisibility: NavigationSplitViewVisibility = .doubleColumn
+    // Sticky once the wheel lands on "Custom…", so editing a width/height that briefly equals a
+    // preset doesn't snap the wheel back off Custom. A stored non-preset value reads as custom even
+    // when this is false (see `isCustomResolution`), so it survives relaunches without persisting.
+    @State private var customMode = false
+    #endif
     #if os(macOS)
     @AppStorage(DefaultsKey.speakerUID) private var speakerUID = ""
     @AppStorage(DefaultsKey.micUID) private var micUID = ""
@@ -39,6 +59,15 @@ struct SettingsView: View {
     @State private var inputDevices: [AudioDevice] = []
     #endif
 
+    #if os(iOS)
+    /// `initialCategory` is nil in the app (the list opens un-selected on iPhone; iPad lands on
+    /// General via `onAppear`). The screenshot harness passes an explicit category so the captured
+    /// shot opens on a real settings page (a populated detail) rather than the bare category list.
+    init(initialCategory: SettingsCategory? = nil) {
+        _settingsSelection = State(initialValue: initialCategory)
+    }
+    #endif
+
     var body: some View {
         #if os(tvOS)
         // Native tv pattern: no inline text entry (typing numbers with a remote is
@@ -66,6 +95,7 @@ struct SettingsView: View {
 
             Form {
                 presenterSection
+                hdrSection
                 windowSection
                 statisticsSection
             }
@@ -98,31 +128,124 @@ struct SettingsView: View {
             }
             .formStyle(.grouped)
             .tabItem { Label("Advanced", systemImage: "slider.horizontal.3") }
+
+            AcknowledgementsView()
+                .tabItem { Label("About", systemImage: "info.circle") }
         }
         .frame(width: 480, height: 460)
     }
     #endif
 
-    // MARK: - iOS: one grouped Form
+    // MARK: - iOS / iPadOS: adaptive split view
 
     #if os(iOS)
     private var iosBody: some View {
-        Form {
+        NavigationSplitView(columnVisibility: $columnVisibility) {
-            streamModeSection
+            List(selection: $settingsSelection) {
-            audioSection
+                ForEach(SettingsCategory.allCases) { category in
-            compositorSection
+                    // On iPhone the split view collapses to a push list, but a selection List
-            presenterSection
+                    // draws no disclosure indicator of its own — add one in compact width for the
-            statisticsSection
+                    // expected drill-in affordance. On iPad the selected row highlights instead, so
-            experimentalSection
+                    // the chevron is omitted there.
-            controllersSection
+                    HStack {
+                        Label(category.title, systemImage: category.symbol)
+                        if horizontalSizeClass == .compact {
+                            Spacer()
+                            Image(systemName: "chevron.forward")
+                                .font(.footnote.weight(.semibold))
+                                .foregroundStyle(.tertiary)
+                                // Purely a drill-in affordance — the row's button trait already
+                                // conveys "opens"; keep it out of the VoiceOver announcement.
+                                .accessibilityHidden(true)
+                        }
+                    }
+                    .tag(category)
+                }
+            }
+            .navigationTitle("Settings")
+            .toolbar {
+                ToolbarItem(placement: .confirmationAction) {
+                    Button("Done") { dismiss() }
+                }
+            }
+        } detail: {
+            // NavigationSplitView hosts the detail in its own navigation context (its title bar),
+            // so no inner NavigationStack — that would double the bar on iPad. On iPhone the split
+            // view collapses to one stack and pushes this when a row is tapped. `?? .general` only
+            // backs the brief pre-selection window; the list never auto-pushes on a nil selection.
+            settingsDetail(settingsSelection ?? .general)
+                // Keep a Done on the detail whenever the sidebar (and its Done) isn't on screen: the
+                // iPhone push, or any iPad layout that collapsed the sidebar to an overlay. When the
+                // sidebar is showing, its Done is the only one — so this stays hidden to avoid two.
+                .toolbar {
+                    if horizontalSizeClass == .compact || columnVisibility == .detailOnly {
+                        ToolbarItem(placement: .confirmationAction) {
+                            Button("Done") { dismiss() }
+                        }
+                    }
+                }
         }
-        .formStyle(.grouped)
         .onAppear {
+            if horizontalSizeClass == .regular, settingsSelection == nil {
+                settingsSelection = .general
+            }
             gamepads.refresh()
             gamepads.startDiscovery()
         }
+        // A regular→regular launch sets the default above; this catches a compact→regular change
+        // (e.g. an iPad leaving narrow split-screen multitasking) so the detail pane fills in.
+        .onChange(of: horizontalSizeClass) { _, newValue in
+            if newValue == .regular, settingsSelection == nil {
+                settingsSelection = .general
+            }
+        }
         .onDisappear { gamepads.stopDiscovery() }
     }
+
+    @ViewBuilder
+    private func settingsDetail(_ category: SettingsCategory) -> some View {
+        switch category {
+        case .general:
+            Form {
+                streamModeSection
+                pointerSection
+                compositorSection
+            }
+            .formStyle(.grouped)
+            .navigationTitle("General")
+            .navigationBarTitleDisplayMode(.inline)
+        case .display:
+            Form {
+                presenterSection
+                hdrSection
+                statisticsSection
+            }
+            .formStyle(.grouped)
+            .navigationTitle("Display")
+            .navigationBarTitleDisplayMode(.inline)
+        case .audio:
+            Form { audioSection }
+                .formStyle(.grouped)
+                .navigationTitle("Audio")
+                .navigationBarTitleDisplayMode(.inline)
+        case .controllers:
+            Form { controllersSection }
+                .formStyle(.grouped)
+                .navigationTitle("Controllers")
+                .navigationBarTitleDisplayMode(.inline)
+        case .advanced:
+            Form { experimentalSection }
+                .formStyle(.grouped)
+                .navigationTitle("Advanced")
+                .navigationBarTitleDisplayMode(.inline)
+        case .about:
+            // Already a full scrollable view that sets its own "Acknowledgements" title; pin the
+            // display mode inline to match the five sibling detail pages (it would otherwise inherit
+            // the large title from the "Settings" sidebar root).
+            AcknowledgementsView()
+                .navigationBarTitleDisplayMode(.inline)
+        }
+    }
     #endif
 
     // MARK: - tvOS
@@ -150,6 +273,10 @@ struct SettingsView: View {
         Binding(get: { hudEnabled ? "on" : "off" }, set: { hudEnabled = $0 == "on" })
     }
 
+    private var hdrEnabledTag: Binding<String> {
+        Binding(get: { hdrEnabled ? "on" : "off" }, set: { hdrEnabled = $0 == "on" })
+    }
+
     private var tvBody: some View {
         let currentTag = "\(width)x\(height)x\(hz)"
         let bounds = UIScreen.main.nativeBounds
@@ -180,20 +307,25 @@ struct SettingsView: View {
                     selection: $audioChannels)
                 if bitrateKbps > 1_000_000 {
                     Label(Self.gigabitWarning, systemImage: "exclamationmark.triangle.fill")
-                        .font(.caption)
+                        .font(.geist(12, relativeTo: .caption))
                         .foregroundStyle(.orange)
                         .multilineTextAlignment(.center)
                 }
                 TVSelectionRow(
                     title: "Compositor", options: compositors, selection: $compositor)
+                #if DEBUG
                 TVSelectionRow(
-                    title: "Presenter",
+                    title: "Presenter (debug)",
-                    options: [("Stage 1 (default)", "stage1"), ("Stage 2 (experimental)", "stage2")],
+                    options: [("Stage 2 (default)", "stage2"), ("Stage 1 (debug)", "stage1")],
                     selection: $presenter)
+                #endif
+                TVSelectionRow(
+                    title: "10-bit HDR",
+                    options: [("On", "on"), ("Off", "off")], selection: hdrEnabledTag)
                 Text("The host creates a virtual output at exactly this mode — native "
                     + "resolution, no scaling. \(Self.bitrateFooter) A specific compositor "
                     + "is honored only if available on the host.")
-                    .font(.caption)
+                    .font(.geist(12, relativeTo: .caption))
                     .foregroundStyle(.secondary)
                     .multilineTextAlignment(.center)
                     .padding(.top, 8)
@@ -213,10 +345,12 @@ struct SettingsView: View {
                 TVSelectionRow(
                     title: "Controller type", options: Self.padTypes, selection: $gamepadType)
                 Text(Self.controllersFooter)
-                    .font(.caption)
+                    .font(.geist(12, relativeTo: .caption))
                     .foregroundStyle(.secondary)
                     .multilineTextAlignment(.center)
                     .padding(.top, 8)
+                NavigationLink("Acknowledgements") { AcknowledgementsView() }
+                    .padding(.top, 8)
             }
             .frame(maxWidth: 1000)
             .frame(maxWidth: .infinity)
@@ -235,6 +369,63 @@ struct SettingsView: View {
 
     @ViewBuilder private var streamModeSection: some View {
         Section {
+            #if os(iOS)
+            // Touch-first: a rotating wheel of common resolutions (this device's own mode first) and
+            // a segmented refresh-rate control — the same family as the Clock/Timer pickers. The host
+            // renders a virtual output at exactly the chosen mode, so these are real pixel sizes. The
+            // last wheel row, "Custom…", reveals width/height/refresh fields for an arbitrary mode.
+            VStack(alignment: .leading, spacing: 4) {
+                Text("Resolution")
+                    .font(.geist(15, relativeTo: .subheadline))
+                    .foregroundStyle(.secondary)
+                Picker("Resolution", selection: resolutionSelection) {
+                    ForEach(resolutionChoices, id: \.tag) { choice in
+                        Text(choice.label).tag(choice.tag)
+                    }
+                }
+                .labelsHidden()
+                .pickerStyle(.wheel)
+                .frame(maxHeight: 140)
+            }
+            if isCustomResolution {
+                // Arbitrary entry: type the exact width × height (and refresh) the host should drive.
+                HStack {
+                    TextField("Width", value: $width, format: .number.grouping(.never))
+                        .keyboardType(.numberPad)
+                    Text("×")
+                    TextField("Height", value: $height, format: .number.grouping(.never))
+                        .labelsHidden()
+                        .keyboardType(.numberPad)
+                }
+                // A row built from an HStack of TextFields otherwise insets its bottom separator to
+                // the inner content, clipping the hairline under "Width"; pin it to the cell edge.
+                .alignmentGuide(.listRowSeparatorLeading) { _ in 0 }
+                LabeledContent("Refresh rate") {
+                    TextField("Hz", value: $hz, format: .number.grouping(.never))
+                        .keyboardType(.numberPad)
+                        .multilineTextAlignment(.trailing)
+                }
+            } else if refreshChoices.count > 1 {
+                VStack(alignment: .leading, spacing: 6) {
+                    Text("Refresh rate")
+                        .font(.geist(15, relativeTo: .subheadline))
+                        .foregroundStyle(.secondary)
+                    Picker("Refresh rate", selection: $hz) {
+                        ForEach(refreshChoices, id: \.self) { rate in
+                            Text("\(rate) Hz").tag(rate)
+                        }
+                    }
+                    .labelsHidden()
+                    .pickerStyle(.segmented)
+                }
+            } else {
+                // A device with a single supported rate (e.g. 60 Hz) has nothing to pick.
+                LabeledContent("Refresh rate") {
+                    Text("\(hz) Hz").foregroundStyle(.secondary)
+                }
+            }
+            Button("Use this display's mode") { fillFromMainScreen() }
+            #elseif os(macOS)
             HStack {
                 TextField("Resolution", value: $width, format: .number.grouping(.never))
                 Text("×")
@@ -245,6 +436,7 @@ struct SettingsView: View {
             LabeledContent("") {
                 Button("Use this display's mode") { fillFromMainScreen() }
             }
+            #endif
             #if !os(tvOS)
             Toggle("Automatic bitrate", isOn: automaticBitrate)
             if bitrateKbps != 0 {
@@ -259,7 +451,7 @@ struct SettingsView: View {
                 }
                 if bitrateKbps > 1_000_000 {
                     Label(Self.gigabitWarning, systemImage: "exclamationmark.triangle.fill")
-                        .font(.caption)
+                        .font(.geist(12, relativeTo: .caption))
                         .foregroundStyle(.orange)
                 }
             }
@@ -269,11 +461,85 @@ struct SettingsView: View {
         } footer: {
             Text("The host creates a virtual output at exactly this mode — "
                 + "native resolution, no scaling. \(Self.bitrateFooter)")
-                .font(.caption)
+                .font(.geist(12, relativeTo: .caption))
                 .foregroundStyle(.secondary)
         }
     }
 
+    #if os(iOS)
+    // MARK: - Stream mode (iOS wheel)
+
+    /// Sentinel wheel tag for the "Custom…" row. Real tags are "WxH" (digits + "x"), so this can't
+    /// collide with a resolution.
+    private static let customResolutionTag = "custom"
+
+    /// 16:9 then ultrawide presets; the device's native mode is prepended at runtime.
+    private static let resolutionPresets: [(name: String, w: Int, h: Int)] = [
+        ("720p", 1280, 720),
+        ("1080p", 1920, 1080),
+        ("1440p", 2560, 1440),
+        ("4K", 3840, 2160),
+        ("Ultrawide 1080p", 2560, 1080),
+        ("Ultrawide 1440p", 3440, 1440),
+        ("Super ultrawide", 5120, 1440),
+    ]
+
+    /// The non-custom wheel rows: this device's native mode first, then the presets, deduped by
+    /// dimensions (native wins a tie).
+    private var resolutionModes: [(name: String, w: Int, h: Int)] {
+        let bounds = UIScreen.main.nativeBounds // portrait-oriented pixels
+        let native = (w: Int(max(bounds.width, bounds.height)), h: Int(min(bounds.width, bounds.height)))
+        let all = [(name: "This device", w: native.w, h: native.h)] + Self.resolutionPresets
+        var seen = Set<String>()
+        return all.filter { seen.insert("\($0.w)x\($0.h)").inserted }
+    }
+
+    /// Wheel rows: the resolution modes, then a "Custom…" row that reveals the numeric fields.
+    private var resolutionChoices: [(label: String, tag: String)] {
+        resolutionModes.map { (label: "\($0.name)  ·  \($0.w) × \($0.h)", tag: "\($0.w)x\($0.h)") }
+            + [(label: "Custom…", tag: Self.customResolutionTag)]
+    }
+
+    private var presetResolutionTags: Set<String> {
+        Set(resolutionModes.map { "\($0.w)x\($0.h)" })
+    }
+
+    /// True when the editable custom fields should show: the wheel is parked on "Custom…" (sticky),
+    /// or the stored size simply isn't one of the presets (e.g. a value synced from a Mac) — so a
+    /// non-preset mode stays editable across relaunches without a persisted flag.
+    private var isCustomResolution: Bool {
+        customMode || !presetResolutionTags.contains("\(width)x\(height)")
+    }
+
+    /// The wheel works in "WxH" tags so one selection drives both width and height; the custom
+    /// sentinel toggles `customMode` instead of writing a size.
+    private var resolutionSelection: Binding<String> {
+        Binding(
+            get: { isCustomResolution ? Self.customResolutionTag : "\(width)x\(height)" },
+            set: { tag in
+                if tag == Self.customResolutionTag {
+                    customMode = true
+                    return
+                }
+                customMode = false
+                let parts = tag.split(separator: "x").compactMap { Int($0) }
+                guard parts.count == 2 else { return }
+                width = parts[0]
+                height = parts[1]
+            })
+    }
+
+    /// Refresh rates the device can actually display (no point asking the host to render frames the
+    /// screen can't show), plus any stored custom value so it stays selectable.
+    private var refreshChoices: [Int] {
+        let maxHz = UIScreen.main.maximumFramesPerSecond
+        var rates = [60, 120, 240].filter { $0 <= maxHz }
+        if rates.isEmpty { rates = [maxHz] }
+        if !rates.contains(hz) { rates.append(hz) }
+        return rates.sorted()
+    }
+    #endif
+
     @ViewBuilder private var audioSection: some View {
         Section {
             Picker("Audio channels", selection: $audioChannels) {
@@ -313,11 +579,35 @@ struct SettingsView: View {
             Text("Host audio plays through the speaker; the microphone feeds the "
                 + "host's virtual mic. System default follows macOS device changes. "
                 + "Applies from the next session.")
-                .font(.caption)
+                .font(.geist(12, relativeTo: .caption))
                 .foregroundStyle(.secondary)
         }
     }
 
+    #if os(iOS)
+    /// iPad-only pointer-capture toggle: lock the mouse/trackpad for relative movement (games) vs
+    /// forward an absolute cursor position (desktop). Empty on iPhone (no hardware-pointer lock —
+    /// the mouse path there is always the absolute fallback).
+    @ViewBuilder private var pointerSection: some View {
+        if UIDevice.current.userInterfaceIdiom == .pad {
+            Section {
+                Toggle("Capture pointer for games", isOn: $pointerCapture)
+            } header: {
+                Text("Pointer")
+            } footer: {
+                Text("With a mouse or trackpad connected, lock the pointer and send relative "
+                    + "movement — the expected behavior for games (mouse-look). Turn this off for "
+                    + "desktop use to keep the pointer free and send its absolute position instead. "
+                    + "The lock needs the stream full-screen and frontmost; it falls back to the "
+                    + "absolute pointer automatically (Stage Manager, Slide Over). Finger touch is "
+                    + "unaffected. Applies from the next session.")
+                    .font(.geist(12, relativeTo: .caption))
+                    .foregroundStyle(.secondary)
+            }
+        }
+    }
+    #endif
+
     @ViewBuilder private var compositorSection: some View {
         Section {
             Picker("Compositor", selection: $compositor) {
@@ -333,7 +623,7 @@ struct SettingsView: View {
             Text("Which compositor drives the virtual output on the host. A specific "
                 + "choice is honored only if that backend is available there — "
                 + "otherwise the host falls back to auto-detection.")
-                .font(.caption)
+                .font(.geist(12, relativeTo: .caption))
                 .foregroundStyle(.secondary)
         }
     }
@@ -347,26 +637,50 @@ struct SettingsView: View {
         } footer: {
             Text("Take the window fullscreen when a session starts and restore it on the host "
                 + "list, so only the stream is fullscreen — not the picker.")
-                .font(.caption)
+                .font(.geist(12, relativeTo: .caption))
                 .foregroundStyle(.secondary)
         }
         #endif
     }
 
+    // Stage-2 (Metal/VTDecompressionSession) is the default and only user-visible presenter — it
+    // recovers from a wedged decoder, where stage-1's AVSampleBufferDisplayLayer freezes hard on a
+    // lost HEVC reference. Stage-1 is kept reachable as a DEBUG-only override for diagnostics, like
+    // the controller test. Empty in release builds (no presenter UI; stage-2 always).
     @ViewBuilder private var presenterSection: some View {
+        #if DEBUG
         Section {
             Picker("Presenter", selection: $presenter) {
-                Text("Stage 1 (default)").tag("stage1")
+                Text("Stage 2 (default)").tag("stage2")
-                Text("Stage 2 (experimental)").tag("stage2")
+                Text("Stage 1 (debug)").tag("stage1")
             }
         } header: {
-            Text("Video presenter")
+            Text("Video presenter · debug")
         } footer: {
-            Text("Stage 1 feeds compressed video to the system display layer (known-good). "
+            Text("Stage 2 (default) decodes explicitly and presents through Metal with a display "
-                + "Stage 2 decodes explicitly and presents through Metal with a display "
+                + "link — it adds a capture→present (glass-to-glass) latency line in the HUD and "
-                + "link — it adds a capture→present (glass-to-glass) latency line in the HUD "
+                + "self-recovers from decode stalls. Stage 1 feeds compressed video straight to the "
-                + "and shortens the present tail. Applies from the next session.")
+                + "system display layer; it freezes on a lost HEVC reference frame, so it's a debug "
-                .font(.caption)
+                + "fallback only. Applies from the next session.")
+                .font(.geist(12, relativeTo: .caption))
+                .foregroundStyle(.secondary)
+        }
+        #endif
+    }
+
+    @ViewBuilder private var hdrSection: some View {
+        Section {
+            Toggle("10-bit HDR", isOn: $hdrEnabled)
+            Toggle("Full chroma (4:4:4)", isOn: $enable444)
+        } header: {
+            Text("Video quality")
+        } footer: {
+            Text("HDR requests a 10-bit BT.2020 PQ (HDR10) stream — it only engages when the host is "
+                + "sending HDR content AND this display supports HDR. 4:4:4 requests full chroma "
+                + "(sharper text/UI, more bandwidth) — it only engages when this device can "
+                + "hardware-decode it AND the host opted in. Otherwise the stream stays 8-bit "
+                + "4:2:0 SDR. Applies from the next session.")
+                .font(.geist(12, relativeTo: .caption))
                 .foregroundStyle(.secondary)
         }
     }
@@ -384,7 +698,7 @@ struct SettingsView: View {
             Text("Statistics")
         } footer: {
             Text(Self.statisticsFooter)
-                .font(.caption)
+                .font(.geist(12, relativeTo: .caption))
                 .foregroundStyle(.secondary)
         }
     }
@@ -399,7 +713,7 @@ struct SettingsView: View {
                 + "(Steam + custom) via the host's management API; tap a title to launch it. "
                 + "The host must expose that API on the LAN with a token "
                 + "(serve --mgmt-bind 0.0.0.0 --mgmt-token …).")
-                .font(.caption)
+                .font(.geist(12, relativeTo: .caption))
                 .foregroundStyle(.secondary)
         }
     }
@@ -433,7 +747,7 @@ struct SettingsView: View {
             Text("Controllers")
         } footer: {
             Text(Self.controllersFooter)
-                .font(.caption)
+                .font(.geist(12, relativeTo: .caption))
                 .foregroundStyle(.secondary)
         }
     }
@@ -585,13 +899,13 @@ struct SettingsView: View {
                         }
                     }
                 }
-                .font(.caption2)
+                .font(.geist(11, relativeTo: .caption2))
                 .foregroundStyle(.secondary)
             }
             Spacer()
             if gamepads.active?.id == controller.id {
                 Text("In use")
-                    .font(.caption2.weight(.semibold))
+                    .font(.geist(11, .semibold, relativeTo: .caption2))
                     .padding(.horizontal, 8)
                     .padding(.vertical, 3)
                     .background(Capsule().fill(.green.opacity(0.2)))
@@ -613,6 +927,10 @@ struct SettingsView: View {
         width = Int(max(bounds.width, bounds.height))
         height = Int(min(bounds.width, bounds.height))
         hz = UIScreen.main.maximumFramesPerSecond
+        #if os(iOS)
+        // The native mode is the "This device" wheel row, so leave Custom mode if it was on.
+        customMode = false
+        #endif
         #endif
     }
 }
@@ -623,3 +941,52 @@ extension Double {
         Swift.min(Swift.max(self, lo), hi)
     }
 }
+
+#if os(iOS)
+/// The settings groups, mirroring the macOS preference tabs. On iPad each is a sidebar row that
+/// drives the detail pane; on iPhone the same list collapses to pushed sub-pages. Internal (not
+/// private) so the screenshot harness can open SettingsView on a specific category.
+enum SettingsCategory: String, CaseIterable, Identifiable {
+    case general, display, audio, controllers, advanced, about
+
+    var id: Self { self }
+
+    var title: String {
+        switch self {
+        case .general: return "General"
+        case .display: return "Display"
+        case .audio: return "Audio"
+        case .controllers: return "Controllers"
+        case .advanced: return "Advanced"
+        case .about: return "About"
+        }
+    }
+
+    var symbol: String {
+        switch self {
+        case .general: return "gearshape"
+        case .display: return "display"
+        case .audio: return "speaker.wave.2"
+        case .controllers: return "gamecontroller"
+        case .advanced: return "slider.horizontal.3"
+        case .about: return "info.circle"
+        }
+    }
+}
+
+extension View {
+    /// Present the settings sheet large on iPad so the NavigationSplitView has room for its
+    /// sidebar + detail — a default form sheet is too narrow and the split view would collapse to
+    /// the iPhone push list. No-op on iPhone (the standard sheet is already right) and on iOS 17
+    /// (no `presentationSizing` — it falls back to the default sheet, which still degrades cleanly
+    /// to the push list).
+    @ViewBuilder
+    func settingsSheetSizing() -> some View {
+        if UIDevice.current.userInterfaceIdiom == .pad, #available(iOS 18, *) {
+            presentationSizing(.page)
+        } else {
+            self
+        }
+    }
+}
+#endif

clients/apple/Sources/PunktfunkClient/SpeedTestSheet.swift

@@ -52,7 +52,7 @@ struct SpeedTestSheet: View {
     var body: some View {
         VStack(spacing: 20) {
             Label("Speed test — \(host.displayName)", systemImage: "gauge.with.needle")
-                .font(.headline)
+                .font(.geist(17, .semibold, relativeTo: .headline))
                 .foregroundStyle(.tint)
 
             switch phase {
@@ -73,7 +73,7 @@ struct SpeedTestSheet: View {
                 resultView(result)
             case .failed(let message):
                 Text(message)
-                    .font(.callout)
+                    .font(.geist(16, relativeTo: .callout))
                     .foregroundStyle(.red)
                     .multilineTextAlignment(.center)
             }
@@ -149,13 +149,13 @@ struct SpeedTestSheet: View {
             if let rec = Self.recommendedKbps(result) {
                 Text("Recommended bitrate: \(Self.mbpsLabel(kbps: rec)) "
                     + "(~70% of measured, headroom for encoder bursts).")
-                    .font(.caption)
+                    .font(.geist(12, relativeTo: .caption))
                     .foregroundStyle(.secondary)
                     .multilineTextAlignment(.center)
             } else {
                 Text("Too little data made it through to recommend a bitrate — "
                     + "check the network and retry.")
-                    .font(.caption)
+                    .font(.geist(12, relativeTo: .caption))
                     .foregroundStyle(.secondary)
                     .multilineTextAlignment(.center)
             }

clients/apple/Sources/PunktfunkClient/StreamHUDView.swift

@@ -69,19 +69,19 @@ struct StreamHUDView: View {
             Text(model.mouseCaptured
                 ? "⌘⎋ releases the mouse"
                 : "Click the stream to capture input")
-                .font(.caption2)
+                .font(.geist(11, relativeTo: .caption2))
                 .foregroundStyle(.secondary)
             // The client-side cursor (⌘⇧C) draws the local cursor over the stream instead of
             // capturing it — the only accurate cursor for gamescope, whose capture has none.
             Text("⌘⇧C toggles the on-screen cursor")
-                .font(.caption2)
+                .font(.geist(11, relativeTo: .caption2))
                 .foregroundStyle(.secondary)
             #elseif os(iOS)
             // Touch always plays directly; ⌘⎋ (hardware keyboard) toggles kb/mouse.
             Text(model.mouseCaptured
                 ? "⌘⎋ releases keyboard & mouse"
                 : "⌘⎋ captures keyboard & mouse")
-                .font(.caption2)
+                .font(.geist(11, relativeTo: .caption2))
                 .foregroundStyle(.secondary)
             #endif
             #if os(tvOS)
@@ -89,13 +89,13 @@ struct StreamHUDView: View {
             // A press (the focus engine consumes it before the host sees it). Disconnect is
             // the Siri Remote's Menu button (.onExitCommand on the stream) — just hint it.
             Text("Press Menu to disconnect")
-                .font(.caption)
+                .font(.geist(12, relativeTo: .caption))
                 .foregroundStyle(.secondary)
             #else
             // ⌘D lives on the app's Stream menu (so it still works when the HUD is hidden);
             // this button is the in-overlay, click-to-disconnect affordance.
             Button("Disconnect (⌘D)") { model.disconnect() }
-                .font(.caption)
+                .font(.geist(12, relativeTo: .caption))
             #endif
         }
         .padding(10)

clients/apple/Sources/PunktfunkClient/TrustCardView.swift

@@ -3,6 +3,7 @@
 // or drops this and runs the PIN pairing ceremony instead.
 
 import Foundation
+import PunktfunkKit
 import SwiftUI
 
 struct TrustCardView: View {
@@ -18,11 +19,11 @@ struct TrustCardView: View {
                 .font(.system(size: 36, weight: .light))
                 .foregroundStyle(.tint)
             Text("Verify \(hostName)")
-                .font(.title3.weight(.semibold))
+                .font(.geist(20, .semibold, relativeTo: .title3))
             Text("First connection. Compare this fingerprint with the one "
                 + "punktfunk-host logged at startup (\u{201C}clients pin this "
                 + "fingerprint\u{201D}):")
-                .font(.callout)
+                .font(.geist(16, relativeTo: .callout))
                 .foregroundStyle(.secondary)
                 .multilineTextAlignment(.center)
             Text(Self.format(fingerprint: fingerprint))
@@ -58,7 +59,7 @@ struct TrustCardView: View {
                 #else
                 .buttonStyle(.borderless)
                 #endif
-                .font(.callout)
+                .font(.geist(16, relativeTo: .callout))
         }
         .padding(28)
         .frame(maxWidth: 440)

clients/apple/Sources/PunktfunkKit/BrandFont.swift

@@ -0,0 +1,101 @@
+// Geist — the punktfunk brand typeface (the same family the website ships). Bundled as static
+// OTF weights in this kit's resources and registered with Core Text at first use, so it works
+// identically in the Xcode app and the `swift run` dev shell (Bundle.module resolves to the
+// package resource bundle in both). Geist Sans carries titles/UI; Geist Mono carries the technical
+// readouts — host addresses, status labels, the stream-stats HUD — for the industrial look.
+//
+// Licensed under the SIL Open Font License 1.1 (Resources/Fonts/Geist-OFL.txt).
+
+import CoreText
+import SwiftUI
+#if canImport(UIKit)
+import UIKit
+#elseif canImport(AppKit)
+import AppKit
+#endif
+
+public enum BrandFont {
+    public enum Weight {
+        case regular, medium, semibold, bold
+    }
+
+    /// PostScript names of the bundled faces (verified from each OTF's name table). Geist Sans only
+    /// — Geist Mono is intentionally not shipped; the app's typeface is Geist Sans throughout.
+    private static let sansFaces = ["Geist-Regular", "Geist-Medium", "Geist-SemiBold", "Geist-Bold"]
+
+    /// Registered exactly once per process — a static `let` initializer is run lazily and is
+    /// guaranteed thread-safe + run-at-most-once by the runtime.
+    private static let registered: Void = {
+        for face in sansFaces {
+            guard let url = Bundle.module.url(
+                forResource: face, withExtension: "otf", subdirectory: "Fonts") else {
+                #if DEBUG
+                print("BrandFont: bundled face \(face).otf not found — text will fall back to system")
+                #endif
+                continue
+            }
+            var error: Unmanaged<CFError>?
+            if !CTFontManagerRegisterFontsForURL(url as CFURL, .process, &error) {
+                #if DEBUG
+                let message = error?.takeRetainedValue().localizedDescription ?? "unknown error"
+                print("BrandFont: failed to register \(face): \(message)")
+                #endif
+            }
+        }
+    }()
+
+    /// Force registration before the first `Font.custom` lookup. Cheap to call repeatedly.
+    public static func registerIfNeeded() { _ = registered }
+
+    fileprivate static func sansFace(_ weight: Weight) -> String {
+        switch weight {
+        case .regular: return "Geist-Regular"
+        case .medium: return "Geist-Medium"
+        case .semibold: return "Geist-SemiBold"
+        case .bold: return "Geist-Bold"
+        }
+    }
+}
+
+public extension Color {
+    /// The punktfunk brand purple (the app-icon lens / website `--brand`). Defined explicitly,
+    /// independent of the asset-catalog accent — `Color.accentColor` resolution is environment- and
+    /// timing-sensitive (it can fall back to system blue), and the brand mark must never drift.
+    /// Light: #6656F2, Dark: #8678F5 (the lighter violet reads better on dark surfaces).
+    static let brand: Color = {
+        #if canImport(UIKit)
+        return Color(UIColor { traits in
+            traits.userInterfaceStyle == .dark
+                ? UIColor(red: 0x86 / 255, green: 0x78 / 255, blue: 0xF5 / 255, alpha: 1)
+                : UIColor(red: 0x66 / 255, green: 0x56 / 255, blue: 0xF2 / 255, alpha: 1)
+        })
+        #elseif canImport(AppKit)
+        return Color(NSColor(name: nil) { appearance in
+            appearance.bestMatch(from: [.aqua, .darkAqua]) == .darkAqua
+                ? NSColor(red: 0x86 / 255, green: 0x78 / 255, blue: 0xF5 / 255, alpha: 1)
+                : NSColor(red: 0x66 / 255, green: 0x56 / 255, blue: 0xF2 / 255, alpha: 1)
+        })
+        #else
+        // Non-Apple fallback: the light brand value, so all branches agree on a canonical color.
+        return Color(red: 0x66 / 255, green: 0x56 / 255, blue: 0xF2 / 255)
+        #endif
+    }()
+}
+
+public extension Font {
+    /// Geist Sans at an explicit point size, scaling with Dynamic Type relative to `textStyle`.
+    static func geist(
+        _ size: CGFloat, _ weight: BrandFont.Weight = .regular,
+        relativeTo textStyle: TextStyle = .body
+    ) -> Font {
+        BrandFont.registerIfNeeded()
+        return .custom(BrandFont.sansFace(weight), size: size, relativeTo: textStyle)
+    }
+
+    /// Geist Sans at a FIXED point size that does not scale with Dynamic Type — for glyphs pinned
+    /// inside a fixed-size container (e.g. the monogram tile), where a scaled letter would overflow.
+    static func geistFixed(_ size: CGFloat, _ weight: BrandFont.Weight = .regular) -> Font {
+        BrandFont.registerIfNeeded()
+        return .custom(BrandFont.sansFace(weight), fixedSize: size)
+    }
+}

clients/apple/Sources/PunktfunkKit/DefaultsKeys.swift

@@ -22,9 +22,22 @@ public enum DefaultsKey {
     public static let speakerUID = "punktfunk.speakerUID"
     public static let micUID = "punktfunk.micUID"
     public static let presenter = "punktfunk.presenter"
+    /// Request a 10-bit BT.2020 PQ (HDR10) stream. On by default; only takes effect when the host
+    /// has HDR content AND this display supports HDR — otherwise the stream stays 8-bit SDR.
+    public static let hdrEnabled = "punktfunk.hdrEnabled"
+    /// Request a full-chroma 4:4:4 stream when this device can HARDWARE-decode it (`Stage444Probe`).
+    /// On by default; only takes effect when the host also opted in to 4:4:4 (otherwise the stream
+    /// stays 4:2:0). Sharper text/UI at the cost of more bandwidth.
+    public static let enable444 = "punktfunk.enable444"
     public static let hosts = "punktfunk.hosts"
     /// Client-side cursor mode: "auto" (shown only in gamescope sessions), "always", "never".
     public static let cursorMode = "punktfunk.cursorMode"
+    /// iPad: capture the mouse/trackpad pointer (pointer lock → relative movement) for games,
+    /// rather than forwarding an absolute cursor position. On by default. Only meaningful on iPad
+    /// with a hardware mouse/trackpad; the system grants the lock only to a full-screen, frontmost
+    /// scene and silently falls back to the absolute pointer when it can't (Stage Manager / Slide
+    /// Over). Read by `StreamViewController.prefersPointerLocked`.
+    public static let pointerCapture = "punktfunk.pointerCapture"
     /// Experimental: show the host's game library (browsed over the management API). Off by default.
     public static let libraryEnabled = "punktfunk.libraryEnabled"
     /// macOS: take the window fullscreen while streaming and restore it on the host list. On by default.

clients/apple/Sources/PunktfunkKit/GamepadFeedback.swift

@@ -68,6 +68,14 @@ private final class RumbleRenderer: @unchecked Sendable {
     private var broken = false
     /// Last logged active/silent state — for a one-line transition log, not per-event spam.
     private var wasActive = false
+    // Backoff after an engine failure. A broken `gamecontrollerd.haptics` XPC connection (CoreHaptics
+    // -4811 "server connection broke") fails EVERY rebuild until the service relaunches — and that
+    // break fires neither stoppedHandler nor resetHandler, so without a cooldown the next rumble
+    // update immediately rebuilds into the same dead connection, flooding the log and never
+    // recovering. Delay the next setup() — growing 0.5→1→2→4 s on repeated failure — and clear it
+    // the moment a player runs cleanly (or the controller changes).
+    private var retryAfter = Date.distantPast
+    private var consecutiveFailures = 0
 
     /// CHHapticEvent sharpness = actuator frequency. A DualSense's voice-coil motors need a
     /// defined frequency to move at all — an intensity-only event (no sharpness) left them
@@ -91,6 +99,8 @@ private final class RumbleRenderer: @unchecked Sendable {
             self.closeHID()
             self.controller = c
             self.broken = false
+            self.consecutiveFailures = 0
+            self.retryAfter = .distantPast
             _ = self.openHIDIfDualSense(c)
             onBackend?(self.backendNote(for: c))
         }
@@ -108,7 +118,7 @@ private final class RumbleRenderer: @unchecked Sendable {
             // other pad (and for a DualSense whose HID device could not be opened).
             if self.hidRumble(low: lowAmp, high: highAmp) { return }
             guard !self.broken else { return }
-            if active, self.low == nil, self.high == nil {
+            if active, self.low == nil, self.high == nil, Date() >= self.retryAfter {
                 self.setup()
             }
             let ok: Bool
@@ -124,8 +134,15 @@ private final class RumbleRenderer: @unchecked Sendable {
             }
             // Rebuild on the next nonzero amplitude if an engine errored — and tear down OUTSIDE
             // the `inout` accesses above, so teardown() never mutates a motor that a `drive` call
-            // still holds an exclusive reference to.
+            // still holds an exclusive reference to. Back off so a broken XPC isn't re-hit every
-            if !ok { self.teardown() }
+            // update; once a player is actually running the path has recovered, so clear the backoff.
+            if !ok {
+                self.teardown()
+                self.scheduleRetryBackoff()
+            } else if self.low?.player != nil || self.high?.player != nil {
+                self.consecutiveFailures = 0
+                self.retryAfter = .distantPast
+            }
         }
     }
 
@@ -157,14 +174,29 @@ private final class RumbleRenderer: @unchecked Sendable {
             low = makeMotor(haptics, .default)
         }
         if low == nil, high == nil {
-            // Haptics present but no engine could be built right now (server busy / a transient
+            // Haptics present but no engine could be built right now (server busy / XPC broken). Do
-            // error). Do NOT latch broken — the next nonzero amplitude retries setup().
+            // NOT latch broken — back off and the next nonzero amplitude past the cooldown retries.
-            log.warning("rumble: haptics present but engine setup failed — will retry on next rumble")
+            log.warning("rumble: haptics present but engine setup failed — backing off, will retry")
+            scheduleRetryBackoff()
         }
     }
 
+    /// Push the next engine-build attempt out after a failure (capped exponential backoff), so a
+    /// broken `gamecontrollerd.haptics` connection gets time to relaunch instead of being re-hit on
+    /// every rumble update.
+    private func scheduleRetryBackoff() {
+        consecutiveFailures += 1
+        let shift = min(consecutiveFailures - 1, 4)
+        retryAfter = Date().addingTimeInterval(min(0.5 * Double(1 << shift), 4))
+    }
+
     private func makeMotor(_ haptics: GCDeviceHaptics, _ locality: GCHapticsLocality) -> Motor? {
         guard let engine = haptics.createEngine(withLocality: locality) else { return nil }
+        // A controller's motors carry no audio, so keep this engine OUT of the app's audio session
+        // (the default is to join it). Streaming keeps an AVAudioSession active the whole time;
+        // letting a haptics-only engine join it is a needless coupling that can get its
+        // gamecontrollerd XPC connection interrupted (the repeated -4811 server-connection breaks).
+        engine.playsHapticsOnly = true
         // The haptic server can stop or reset the engine out from under us — app backgrounding, an
         // audio-session interruption (a call, Siri, another audio app), or a server crash. Left
         // unhandled the players go dead and every later rumble throws, latching rumble off for the
@@ -338,29 +370,32 @@ public final class GamepadFeedback {
         // Hidout traffic (lightbar / player LEDs / triggers) only exists on a PlayStation-pad
         // session — a DualSense or a DualShock 4 (lightbar only). Block briefly on it there and
         // let rumble own the wait elsewhere; on an Xbox session it stays nonblocking.
-        let hasHidout = connection.resolvedGamepad == .dualSense
-            || connection.resolvedGamepad == .dualShock4
-        let hidTimeout: UInt32 = hasHidout ? 10 : 0
         let thread = Thread { [connection, flag, drainDone, weak self] in
             while !flag.isStopped {
                 do {
-                    if let r = try connection.nextRumble(timeoutMs: 10), r.pad == 0 {
+                    // Poll the feedback planes NON-BLOCKING. A blocking poll (timeoutMs > 0) holds
+                    // the connection's shared feedback lock for its whole wait; the video pump drains
+                    // HDR mastering metadata (nextHdrMeta) on the SAME lock every frame, so a blocking
+                    // poll here starved it and throttled HDR to ~1 fps (SDR, which never drains HDR
+                    // meta, was unaffected). Pacing with a short sleep OUTSIDE the lock (below) keeps
+                    // rumble/HID latency low while leaving the lock free between polls.
+                    if let r = try connection.nextRumble(timeoutMs: 0), r.pad == 0 {
                         self?.rumble.apply(low: r.low, high: r.high)
                     }
-                    // Drain a BOUNDED burst of hidout events: only the first poll waits,
+                    // Drain a BOUNDED burst of hidout events so sustained 0xCD traffic (a game writing
-                    // and the cap + stop check keep sustained 0xCD traffic (a game writing
+                    // per-frame LED/trigger reports) can't spin here or block stop() past one cycle.
-                    // per-frame LED/trigger reports) from starving the rumble poll above
-                    // or blocking stop() past one cycle.
                     var burst = 0
                     while burst < 64, !flag.isStopped,
-                          let ev = try connection.nextHidOutput(
+                          let ev = try connection.nextHidOutput(timeoutMs: 0) {
-                            timeoutMs: burst == 0 ? hidTimeout : 0) {
                         self?.render(ev)
                         burst += 1
                     }
                 } catch {
                     break // .closed (or fatal) — the session is over
                 }
+                // ~8 ms poll cadence (≈125 Hz), slept OUTSIDE the feedback lock — low rumble/HID
+                // latency without holding the lock the HDR-meta drain needs.
+                if !flag.isStopped { Thread.sleep(forTimeInterval: 0.008) }
             }
             drainDone.signal()
         }

clients/apple/Sources/PunktfunkKit/InputCapture.swift

@@ -160,7 +160,13 @@ public final class InputCapture {
             previous.onPreempted?()
         }
         Self.activeCapture = self
-        if let mouse = GCMouse.current { attach(mouse: mouse) }
+        // Attach EVERY connected mouse, not just GCMouse.current. With two pointing devices (e.g.
+        // the iPad's own Magic Keyboard trackpad AND a Universal Control "V-UC Automouse"), only one
+        // is `current` at a time; attaching just that one left the OTHER device's motion handler
+        // uninstalled, so moving it did nothing. Each GCMouse delivers its own deltas through its own
+        // handler, so handling all of them lets either device drive. New arrivals are caught by the
+        // GCMouseDidConnect observer below.
+        for mouse in GCMouse.mice() { attach(mouse: mouse) }
         if let keyboard = GCKeyboard.coalesced { attach(keyboard: keyboard) }
         observers.append(NotificationCenter.default.addObserver(
             forName: .GCMouseDidConnect, object: nil, queue: .main

clients/apple/Sources/PunktfunkKit/Licenses.swift

@@ -0,0 +1,61 @@
+import Foundation
+
+/// Open-source license / attribution text bundled with PunktfunkKit (see `Resources/`).
+///
+/// Exposed from the kit so the app shell can show an Acknowledgements screen. The text files are
+/// bundled as SwiftPM resources and read via `Bundle.module`, which works both for `swift build`
+/// and for the Xcode app (it links the PunktfunkKit product, so the resource bundle rides along).
+public enum Licenses {
+    private static func resource(_ name: String) -> String {
+        guard let url = Bundle.module.url(forResource: name, withExtension: "txt"),
+            let text = try? String(contentsOf: url, encoding: .utf8)
+        else { return "" }
+        return text
+    }
+
+    /// punktfunk's own license — MIT OR Apache-2.0, at your option.
+    public static var appLicense: String {
+        let mit = resource("LICENSE-MIT")
+        let apache = resource("LICENSE-APACHE")
+        if mit.isEmpty && apache.isEmpty {
+            return "punktfunk is licensed under MIT OR Apache-2.0, at your option."
+        }
+        return "punktfunk is licensed under MIT OR Apache-2.0, at your option.\n\n"
+            + "================================ MIT ================================\n\n"
+            + mit
+            + "\n\n============================== Apache-2.0 ==============================\n\n"
+            + apache
+    }
+
+    /// The bundled brand typeface (Geist Sans + Geist Mono) — SIL Open Font License 1.1. The
+    /// license file ships alongside the OTFs in `Resources/Fonts/`, satisfying the OFL's
+    /// distribution requirement; this surfaces it in the Acknowledgements screen too.
+    public static var fontLicense: String {
+        guard let url = Bundle.module.url(
+            forResource: "Geist-OFL", withExtension: "txt", subdirectory: "Fonts"),
+            let text = try? String(contentsOf: url, encoding: .utf8)
+        else { return "" }
+        return text
+    }
+
+    /// Third-party software notices for the linked Rust crates (generated by
+    /// `scripts/gen-third-party-notices.sh`).
+    public static var thirdPartyNotices: String {
+        let text = resource("THIRD-PARTY-NOTICES")
+        return text.isEmpty ? "Third-party notices unavailable." : text
+    }
+
+    /// `thirdPartyNotices` pre-split into render-sized line chunks. The full notices are ~885 KB /
+    /// 16k lines; a single SwiftUI `Text` that large overshoots CoreText/CoreAnimation's max
+    /// renderable height — it lays out for ages and draws blank past the limit — so the
+    /// Acknowledgements screen renders these chunks in a `LazyVStack` (only on-screen chunks lay
+    /// out, and no chunk is tall enough to clip). Split at line boundaries and joined with "\n";
+    /// the inter-chunk break is the `LazyVStack` row boundary, so no text is lost. Computed once.
+    public static let thirdPartyNoticesChunks: [String] = {
+        let lines = thirdPartyNotices.split(separator: "\n", omittingEmptySubsequences: false)
+        let chunkSize = 200
+        return stride(from: 0, to: lines.count, by: chunkSize).map { start in
+            lines[start..<min(start + chunkSize, lines.count)].joined(separator: "\n")
+        }
+    }()
+}

clients/apple/Sources/PunktfunkKit/MetalVideoPresenter.swift

@@ -1,21 +1,35 @@
-// Stage-2 presenter, present half: draw a decoded NV12 CVPixelBuffer into a CAMetalLayer
+// Stage-2 presenter, present half: draw a decoded NV12 / P010 / 4:4:4 CVPixelBuffer into a CAMetalLayer
-// drawable with a BT.709 YUV→RGB shader. The display link (owned by the hosting view) drives
+// drawable with a Y′CbCr→RGB shader. The hosting view's CADisplayLink drives `render` once per vsync
-// `render` once per vsync with the target present time, so a present can finally be stamped and
+// (via Stage2Pipeline.renderTick) with the target present time, so a present can be stamped and the
-// the present tail hand-paced. See docs apple-stage2-presenter.md.
+// present tail hand-paced. See docs apple-stage2-presenter.md.
 //
-// Main-thread only: created during view setup, `render` called from the view's CADisplayLink
+// Main-thread only: created during view setup, `render`/`configure` called from the view's CADisplayLink
-// (which fires on the main runloop). The Metal objects + texture cache are touched only here.
+// (which fires on the main runloop). The Metal objects + texture cache are touched only here. The one
+// exception is `setHdrMeta`, called from the pump thread — it hops the layer write to main so every
+// CALayer mutation stays on one thread.
 
 #if canImport(Metal) && canImport(QuartzCore)
 import CoreGraphics
 import CoreVideo
 import Metal
 import QuartzCore
+import os
 
-/// Runtime-compiled (no metallib build step needed in SwiftPM): a fullscreen triangle and a
+private let presenterLog = Logger(subsystem: "io.unom.punktfunk", category: "presenter")
-/// BT.709 limited-range NV12→RGB fragment shader. uv.y is flipped (1 - p.y) so the top-left-
+
-/// origin texture presents upright (NDC y is up), not upside down. (Colorspace is BT.709 SDR
+/// HDR reference white (BT.2408 "HDR Reference White"): the absolute luminance, in nits, that the
-/// for now — matches the host; 10-bit/HDR + other matrices are a later tie-in.)
+/// PQ signal's diffuse white sits at. Passed to `CAEDRMetadata.hdr10(opticalOutputScale:)`, it anchors
+/// 203-nit diffuse white at EDR 1.0 (the display's SDR-white level) and lets the system tone-map the
+/// brighter highlights into the panel's headroom. This is the missing anchor that made the old HDR path
+/// render "way too bright" (no `edrMetadata` → no reference-white anchoring); a LARGER value renders
+/// dimmer. Matches the host's standard PQ reference white.
+private let hdrReferenceWhiteNits: Float = 203.0
+
+/// Runtime-compiled (no metallib build step needed in SwiftPM): a fullscreen triangle and BT.709 SDR
+/// and BT.2020-PQ HDR Y′CbCr→RGB fragment shaders. uv.y is flipped (1 - p.y) so the top-left-origin
+/// texture presents upright (NDC y is up). The HDR shader outputs PQ-encoded R′G′B′ as-is — the
+/// CAMetalLayer's `itur_2100_PQ` colour space + `edrMetadata` tell the system compositor the samples
+/// are PQ and how to tone-map them (no EOTF here, matching the host's BT.2020 PQ emission).
 private let shaderSource = """
 #include <metal_stdlib>
 using namespace metal;
@@ -30,11 +44,46 @@ vertex VOut pf_vtx(uint vid [[vertex_id]]) {
     return o;
 }
 
+// Bicubic (Catmull-Rom) sampling of the single-channel luma plane. When the drawable is larger
+// than the decoded frame (a window/view bigger than the host's fixed mode), a bilinear upscale
+// looks soft; Catmull-Rom keeps edges crisp — matching AVSampleBufferDisplayLayer's (stage-1)
+// scaler — and reduces to the exact texel at 1:1, so a native-resolution present stays pixel-exact.
+// Nine bilinear taps (TheRealMJP's optimisation of the 16-tap kernel); `s` MUST be a linear
+// sampler. Luma carries the perceived detail, so only it gets bicubic; chroma stays bilinear.
+float catmullRomLuma(texture2d<float> tex, sampler s, float2 uv) {
+    float2 texSize = float2(tex.get_width(), tex.get_height());
+    float2 samplePos = uv * texSize;
+    float2 tc1 = floor(samplePos - 0.5) + 0.5;
+    float2 f = samplePos - tc1;
+    float2 w0 = f * (-0.5 + f * (1.0 - 0.5 * f));
+    float2 w1 = 1.0 + f * f * (-2.5 + 1.5 * f);
+    float2 w2 = f * (0.5 + f * (2.0 - 1.5 * f));
+    float2 w3 = f * f * (-0.5 + 0.5 * f);
+    float2 w12 = w1 + w2;
+    float2 off12 = w2 / w12;
+    float2 tc0 = (tc1 - 1.0) / texSize;
+    float2 tc3 = (tc1 + 2.0) / texSize;
+    float2 tc12 = (tc1 + off12) / texSize;
+    float r = 0.0;
+    r += tex.sample(s, float2(tc0.x,  tc0.y)).r  * (w0.x  * w0.y);
+    r += tex.sample(s, float2(tc12.x, tc0.y)).r  * (w12.x * w0.y);
+    r += tex.sample(s, float2(tc3.x,  tc0.y)).r  * (w3.x  * w0.y);
+    r += tex.sample(s, float2(tc0.x,  tc12.y)).r * (w0.x  * w12.y);
+    r += tex.sample(s, float2(tc12.x, tc12.y)).r * (w12.x * w12.y);
+    r += tex.sample(s, float2(tc3.x,  tc12.y)).r * (w3.x  * w12.y);
+    r += tex.sample(s, float2(tc0.x,  tc3.y)).r  * (w0.x  * w3.y);
+    r += tex.sample(s, float2(tc12.x, tc3.y)).r  * (w12.x * w3.y);
+    r += tex.sample(s, float2(tc3.x,  tc3.y)).r  * (w3.x  * w3.y);
+    return r;
+}
+
+// SDR: 8-bit NV12 / 4:4:4 (BT.709, limited/video range) → full-range RGB. Chroma is sampled at the
+// same UV as luma, so a full-size 4:4:4 chroma plane needs no shader change vs 4:2:0.
 fragment float4 pf_frag(VOut in [[stage_in]],
                         texture2d<float> lumaTex [[texture(0)]],
                         texture2d<float> chromaTex [[texture(1)]]) {
     constexpr sampler s(filter::linear, address::clamp_to_edge);
-    float y = lumaTex.sample(s, in.uv).r;
+    float y = catmullRomLuma(lumaTex, s, in.uv);
     float2 c = chromaTex.sample(s, in.uv).rg;
     // BT.709, 8-bit limited (video) range → full-range RGB.
     y = (y - 16.0/255.0) * (255.0/219.0);
@@ -46,18 +95,18 @@ fragment float4 pf_frag(VOut in [[stage_in]],
     return float4(saturate(float3(r, g, b)), 1.0);
 }
 
-// HDR: 10-bit P010 (BT.2020, limited range), Y'CbCr that is PQ-encoded. We apply the BT.2020
+// HDR: 10-bit P010 / 4:4:4 (BT.2020, limited range), Y′CbCr that is PQ-encoded. We apply the BT.2020
-// matrix to get PQ-encoded R'G'B' and output it as-is — the CAMetalLayer's itur_2100_PQ colour
+// matrix to get PQ-encoded R′G′B′ and output it as-is — the CAMetalLayer's itur_2100_PQ colour space
-// space + EDR tells the compositor the samples are PQ, so it does the PQ→display mapping. No EOTF
+// + edrMetadata tell the compositor the samples are PQ, so it does the PQ→display tone-map. No EOTF
-// here (matching the host, which emitted BT.2020 PQ). P010 stores the 10-bit code in the high bits
+// here. P010/x444 store the 10-bit code in the high bits of each 16-bit sample, so an .r16Unorm sample
-// of each 16-bit sample, so an .r16Unorm sample reads ~code/1023 (the /1024 vs /1023 error is < 0.1%).
+// reads ~code/1023 (the /1024 vs /1023 error is < 0.1%).
 fragment float4 pf_frag_hdr(VOut in [[stage_in]],
                             texture2d<float> lumaTex [[texture(0)]],
                             texture2d<float> chromaTex [[texture(1)]]) {
     constexpr sampler s(filter::linear, address::clamp_to_edge);
-    float y = lumaTex.sample(s, in.uv).r;
+    float y = catmullRomLuma(lumaTex, s, in.uv);
     float2 c = chromaTex.sample(s, in.uv).rg;
-    // BT.2020 10-bit limited (video) range → full-range PQ R'G'B'.
+    // BT.2020 10-bit limited (video) range → full-range PQ R′G′B′.
     y = (y - 64.0/1023.0) * (1023.0/876.0);
     float u = (c.x - 512.0/1023.0) * (1023.0/896.0);
     float v = (c.y - 512.0/1023.0) * (1023.0/896.0);
@@ -74,21 +123,34 @@ public final class MetalVideoPresenter {
 
     private let device: MTLDevice
     private let queue: MTLCommandQueue
-    /// SDR (BT.709 8-bit NV12 → bgra8) and HDR (BT.2020 PQ 10-bit P010 → rgba16Float) pipelines.
+    /// SDR (BT.709 8-bit → bgra8) and HDR (BT.2020 PQ 10-bit → rgba16Float) pipelines. Selected per
-    /// Selected per frame by `render`; the layer is reconfigured when the mode flips (HDR toggle).
+    /// frame in `render`; the layer is reconfigured to match when the session flips (HDR toggle).
     private let pipelineSDR: MTLRenderPipelineState
     private let pipelineHDR: MTLRenderPipelineState
     private var textureCache: CVMetalTextureCache?
-    /// Current layer configuration — switched lazily in `configure(hdr:)` when a frame's mode differs.
-    private var hdrActive = false
 
-    /// nil if Metal is unavailable (no GPU / a headless CI) — the caller falls back to stage-1.
+    /// Current layer configuration — switched in `configure(hdr:)` when a frame's HDR-ness differs.
-    public init?() {
+    /// Main-thread only (read + written from `render`/`configure`, all on the display-link runloop).
+    private var hdrActive = false
+    /// Last HDR mastering grade received via `setHdrMeta` (the host's 0xCE). Cached so a mid-session
+    /// SDR→HDR flip's `configureColor` re-applies the real grade instead of clobbering it back to the
+    /// bare reference-white anchor (an out-of-order race otherwise: `setHdrMeta` and the flip both write
+    /// `edrMetadata`). Main-thread only.
+    private var lastHdrMeta: PunktfunkConnection.HdrMeta?
+
+    #if DEBUG
+    /// Last logged "decoded→drawable" signature, so the diagnostic logs only on a size/HDR change.
+    private var lastSizeSig = ""
+    #endif
+
+    /// nil if Metal is unavailable (no GPU / a headless CI) or a shader fails to compile — the caller
+    /// falls back to stage-1.
+    public static func make() -> MetalVideoPresenter? {
         guard let device = MTLCreateSystemDefaultDevice(),
               let queue = device.makeCommandQueue()
         else { return nil }
-        self.device = device
+        let pipelineSDR: MTLRenderPipelineState
-        self.queue = queue
+        let pipelineHDR: MTLRenderPipelineState
         do {
             let library = try device.makeLibrary(source: shaderSource, options: nil)
             let vtx = library.makeFunction(name: "pf_vtx")
@@ -105,76 +167,148 @@ public final class MetalVideoPresenter {
         } catch {
             return nil
         }
-        CVMetalTextureCacheCreate(kCFAllocatorDefault, nil, device, nil, &textureCache)
+        var cache: CVMetalTextureCache?
-        guard textureCache != nil else { return nil }
+        CVMetalTextureCacheCreate(kCFAllocatorDefault, nil, device, nil, &cache)
+        guard let textureCache = cache else { return nil }
 
         let layer = CAMetalLayer()
         layer.device = device
         layer.pixelFormat = .bgra8Unorm
         layer.framebufferOnly = true
         layer.isOpaque = true
-        // Triple-buffer: more in-flight drawables before `nextDrawable()` (called on the
-        // display-link / MAIN thread) has to block waiting for one to free.
-        layer.maximumDrawableCount = 3
         #if os(macOS)
-        // The display link already paces exactly one present per vsync. Leaving the layer's
+        // The display link already paces exactly one present per vsync. Leaving the layer's own vsync
-        // own vsync wait on means `commandBuffer.present` ALSO blocks for the hardware vsync,
+        // wait on means `commandBuffer.present` ALSO blocks for the hardware vsync, so `nextDrawable()`
-        // so `nextDrawable()` stalls the MAIN thread until a drawable frees — windowed, the
+        // stalls the MAIN thread until a drawable frees — windowed, the WindowServer's looser
-        // WindowServer's looser compositing hides it; FULLSCREEN's tighter, more-direct path
+        // compositing hides it; FULLSCREEN's tighter path serializes the main thread to the display and
-        // serializes the main thread to the display and the stall surfaces as bad judder.
+        // the stall surfaces as bad judder. Disabling the layer-level sync lets present return promptly
-        // Disabling the layer-level sync lets present return promptly (the display link is the
+        // (the display link is the pacing source) — the fix for the fullscreen stutter. macOS-only.
-        // pacing source), which is what fixes the fullscreen stutter. macOS-only property.
         layer.displaySyncEnabled = false
         #endif
+        // Render the drawable at the DECODED frame's resolution (set per-frame in `render`) and let the
+        // system compositor scale it to the layer's bounds — the same `.resizeAspect` path stage-1's
+        // AVSampleBufferDisplayLayer uses. A native-resolution present is then pixel-exact (1:1, no
+        // shader scaling); a resized window rescales via the system's scaler.
+        layer.contentsGravity = .resizeAspect
+        // Triple-buffer: more in-flight drawables before `nextDrawable()` (called on the display-link /
+        // MAIN thread) has to block waiting for one to free.
+        layer.maximumDrawableCount = 3
+
+        return MetalVideoPresenter(
+            device: device, queue: queue, pipelineSDR: pipelineSDR, pipelineHDR: pipelineHDR,
+            textureCache: textureCache, layer: layer)
+    }
+
+    private init(
+        device: MTLDevice, queue: MTLCommandQueue, pipelineSDR: MTLRenderPipelineState,
+        pipelineHDR: MTLRenderPipelineState, textureCache: CVMetalTextureCache, layer: CAMetalLayer
+    ) {
+        self.device = device
+        self.queue = queue
+        self.pipelineSDR = pipelineSDR
+        self.pipelineHDR = pipelineHDR
+        self.textureCache = textureCache
         self.layer = layer
     }
 
-    /// Track the stream mode (the host can Reconfigure mid-stream). Size is in pixels.
+    /// Configure the layer + active pipeline for an SDR or HDR session. MAIN THREAD ONLY. Called once at
-    public func setDrawableSize(_ size: CGSize) {
+    /// session start and again per-frame from `render` (idempotent — the guard makes a same-state call a
-        guard size.width > 0, size.height > 0 else { return }
+    /// no-op), so a mid-session HDR toggle (the host re-inits its encoder; the decoded `frame.isHDR`
-        if layer.drawableSize != size { layer.drawableSize = size }
+    /// flips) reconfigures here automatically. HDR uses an rgba16Float drawable + BT.2020 PQ colour space
-    }
+    /// + EDR with a 203-nit reference-white anchor; SDR uses the plain 8-bit sRGB path.
-
+    public func configure(hdr: Bool) {
-    /// Reconfigure the layer for SDR or HDR when the stream mode flips (HDR toggle). HDR uses an
-    /// rgba16Float drawable + a BT.2020 PQ colour space + EDR, so the compositor PQ-maps to the
-    /// display; SDR uses the plain 8-bit sRGB path. Main-thread only (called from `render`).
-    private func configure(hdr: Bool) {
         guard hdr != hdrActive else { return }
         hdrActive = hdr
+        configureColor(hdr: hdr)
+    }
+
+    /// Set the layer's pixel format + colour config for SDR or HDR. MAIN THREAD ONLY. EDR is requested
+    /// on macOS + iOS (the old `#if os(macOS)` guard left iOS EDR half-engaged). tvOS has NO EDR API
+    /// (`wantsExtendedDynamicRangeContent`/`edrMetadata`/`CAEDRMetadata` are all unavailable there), so
+    /// it gets the PQ pixel format + colour space only — the tvOS compositor tone-maps from those.
+    private func configureColor(hdr: Bool) {
         if hdr {
             layer.pixelFormat = .rgba16Float
             layer.colorspace = CGColorSpace(name: CGColorSpace.itur_2100_PQ)
-            #if os(macOS)
+            #if !os(tvOS)
             layer.wantsExtendedDynamicRangeContent = true
+            // Anchor reference white. Re-apply the real grade if one already arrived (0xCE before the
+            // flip); otherwise the bare 203-nit anchor. Without this anchor the PQ signal is too bright.
+            layer.edrMetadata = makeEDR(lastHdrMeta)
             #endif
         } else {
+            // SDR: gamma-encoded BT.709 [0,1] in an 8-bit drawable; a nil colorspace tags it device/sRGB
+            // (the proven SDR path — never showed the "too bright" issue, which was HDR-only).
             layer.pixelFormat = .bgra8Unorm
             layer.colorspace = nil
-            #if os(macOS)
+            #if !os(tvOS)
             layer.wantsExtendedDynamicRangeContent = false
+            layer.edrMetadata = nil
             #endif
         }
     }
 
-    /// Draw one decoded frame to the next drawable and present it. `isHDR` selects the 10-bit
+    #if !os(tvOS)
-    /// BT.2020 PQ path (P010 input) vs the 8-bit BT.709 path (NV12 input). Returns true on success;
+    private func makeEDR(_ meta: PunktfunkConnection.HdrMeta?) -> CAEDRMetadata {
-    /// false when there's no drawable yet, a texture couldn't be made, or Metal errored — the
+        CAEDRMetadata.hdr10(
-    /// caller then doesn't stamp a present for this frame.
+            displayInfo: meta?.masteringDisplayColorVolume(),
+            contentInfo: meta?.contentLightLevelInfo(),
+            opticalOutputScale: hdrReferenceWhiteNits)
+    }
+    #endif
+
+    /// Update the HDR mastering metadata (drained from the host's 0xCE datagram) to refine the system
+    /// tone-map from the real grade. Called from the PUMP thread, so the layer write is hopped to MAIN
+    /// (every CALayer mutation stays on one thread). The grade is cached so a later SDR→HDR
+    /// `configureColor` re-applies it; the `edrMetadata` write is gated on `hdrActive` (setting it on an
+    /// SDR layer is harmless but pointless, and the flip will apply it anyway).
+    public func setHdrMeta(_ meta: PunktfunkConnection.HdrMeta) {
+        DispatchQueue.main.async { [weak self] in
+            guard let self else { return }
+            self.lastHdrMeta = meta
+            // tvOS has no edrMetadata — the cached grade is still kept above (harmless), it just can't
+            // be applied to the layer there. macOS/iOS refine the system tone-map from the real grade.
+            #if !os(tvOS)
+            if self.hdrActive { self.layer.edrMetadata = self.makeEDR(meta) }
+            #endif
+        }
+    }
+
+    /// Draw one decoded frame to the next drawable and present it. MAIN THREAD (the display link).
+    /// `isHDR` selects the 10-bit BT.2020 PQ path vs the 8-bit BT.709 path and is reconciled with the
+    /// layer config via `configure`. Returns true on success; false when there's no drawable yet, a
+    /// texture couldn't be made, or Metal errored — the caller then doesn't stamp a present.
     @discardableResult
     public func render(_ pixelBuffer: CVPixelBuffer, isHDR: Bool = false) -> Bool {
+        // Reconcile the layer with the decoded frame's HDR-ness (handles a mid-session SDR↔HDR flip).
         configure(hdr: isHDR)
-        // P010 stores 10-bit luma/chroma in 16-bit samples → R16/RG16; NV12 is 8-bit → R8/RG8.
+
-        let lumaFmt: MTLPixelFormat = isHDR ? .r16Unorm : .r8Unorm
+        // P010/x444 store 10-bit luma/chroma in 16-bit samples → R16/RG16; NV12/444v is 8-bit → R8/RG8.
-        let chromaFmt: MTLPixelFormat = isHDR ? .rg16Unorm : .rg8Unorm
+        // Derived from the actual decoded buffer so a 4:4:4 (full chroma plane) frame just works.
+        let pf = CVPixelBufferGetPixelFormatType(pixelBuffer)
+        let tenBit =
+            pf == kCVPixelFormatType_420YpCbCr10BiPlanarVideoRange
+            || pf == kCVPixelFormatType_420YpCbCr10BiPlanarFullRange
+            || pf == kCVPixelFormatType_444YpCbCr10BiPlanarVideoRange
+            || pf == kCVPixelFormatType_444YpCbCr10BiPlanarFullRange
         guard let textureCache,
-              let luma = makeTexture(pixelBuffer, plane: 0, format: lumaFmt, cache: textureCache),
+              let luma = makeTexture(
-              let chroma = makeTexture(pixelBuffer, plane: 1, format: chromaFmt, cache: textureCache)
+                pixelBuffer, plane: 0, format: tenBit ? .r16Unorm : .r8Unorm, cache: textureCache),
+              let chroma = makeTexture(
+                pixelBuffer, plane: 1, format: tenBit ? .rg16Unorm : .rg8Unorm, cache: textureCache)
         else { return false }
 
-        // The hosting view owns drawableSize (aspect-fit to its bounds); skip until it's laid
+        // Size the drawable to the decoded frame so the fullscreen triangle samples 1:1 (pixel-exact);
-        // out. The fullscreen triangle scales the decoded texture to fill the drawable.
+        // the layer's contentsGravity then scales it to the on-screen bounds via the system compositor
-        guard layer.drawableSize.width > 0, layer.drawableSize.height > 0,
+        // (matching stage-1). drawableSize does NOT track bounds (defaults to 0), so set it BEFORE
-              let drawable = layer.nextDrawable(),
+        // nextDrawable; re-set only on a change (first frame / Reconfigure / HDR flip).
+        let decodedSize = CGSize(
+            width: CVPixelBufferGetWidth(pixelBuffer), height: CVPixelBufferGetHeight(pixelBuffer))
+        if layer.drawableSize != decodedSize { layer.drawableSize = decodedSize }
+        #if DEBUG
+        logSizeIfChanged(decoded: decodedSize)
+        #endif
+        guard let drawable = layer.nextDrawable(),
               let commandBuffer = queue.makeCommandBuffer()
         else { return false }
 
@@ -186,24 +320,23 @@ public final class MetalVideoPresenter {
         guard let encoder = commandBuffer.makeRenderCommandEncoder(descriptor: pass) else {
             return false
         }
-        encoder.setRenderPipelineState(isHDR ? pipelineHDR : pipelineSDR)
+        encoder.setRenderPipelineState(hdrActive ? pipelineHDR : pipelineSDR)
         encoder.setFragmentTexture(CVMetalTextureGetTexture(luma), index: 0)
         encoder.setFragmentTexture(CVMetalTextureGetTexture(chroma), index: 1)
         encoder.drawPrimitives(type: .triangle, vertexStart: 0, vertexCount: 3)
         encoder.endEncoding()
         commandBuffer.present(drawable) // present at the next vsync — lowest latency
-        // Hold the CVMetalTextures + the source pixel buffer (its IOSurface) alive until the GPU
+        // Hold the CVMetalTextures + source pixel buffer (its IOSurface) alive until the GPU finishes
-        // finishes sampling — releasing them at scope exit could free the backing mid-read.
+        // sampling — releasing them at scope exit could free the backing mid-read.
         commandBuffer.addCompletedHandler { _ in _ = (luma, chroma, pixelBuffer) }
         commandBuffer.commit()
         return true
     }
 
-    /// Returns the CVMetalTexture (not just its MTLTexture) so the caller can keep it alive past
+    /// Returns the CVMetalTexture (not just its MTLTexture) so the caller can keep it alive past the
-    /// the draw — the MTLTexture is only valid while its CVMetalTexture is retained.
+    /// draw — the MTLTexture is only valid while its CVMetalTexture is retained.
     private func makeTexture(
-        _ pixelBuffer: CVPixelBuffer, plane: Int, format: MTLPixelFormat,
+        _ pixelBuffer: CVPixelBuffer, plane: Int, format: MTLPixelFormat, cache: CVMetalTextureCache
-        cache: CVMetalTextureCache
     ) -> CVMetalTexture? {
         let w = CVPixelBufferGetWidthOfPlane(pixelBuffer, plane)
         let h = CVPixelBufferGetHeightOfPlane(pixelBuffer, plane)
@@ -215,5 +348,16 @@ public final class MetalVideoPresenter {
         else { return nil }
         return cvTexture
     }
+
+    #if DEBUG
+    private func logSizeIfChanged(decoded: CGSize) {
+        let sig = "\(Int(decoded.width))x\(Int(decoded.height))|hdr\(hdrActive ? 1 : 0)"
+        if sig != lastSizeSig {
+            lastSizeSig = sig
+            let msg = "stage2: decoded \(Int(decoded.width))x\(Int(decoded.height)) hdr=\(hdrActive)"
+            presenterLog.info("\(msg, privacy: .public)")
+        }
+    }
+    #endif
 }
 #endif

clients/apple/Sources/PunktfunkKit/PointerLockChain.swift

@@ -0,0 +1,94 @@
+// Steers the system's iPad pointer-lock resolution down to a chosen "anchor" view controller.
+//
+// `UIViewController.prefersPointerLocked` is resolved the same way as the status bar: the system
+// walks DOWN from the window's root view controller through `childViewControllerForPointerLock`.
+// SwiftUI's hosting / container view controllers do NOT forward that query to their children, so a
+// `UIViewControllerRepresentable` controller buried in the SwiftUI tree (our StreamViewController)
+// is never consulted — its `prefersPointerLocked = true` is silently ignored and a Magic Keyboard
+// trackpad / mouse falls through to the absolute-pointer path instead of being captured.
+//
+// Swizzling the DEFAULT implementation isn't enough: the controllers that break the chain
+// (UIHostingController and SwiftUI's internal containers) provide their OWN implementation of the
+// property, so a base-class swizzle never runs for them. Instead we walk UP the LIVE `parent`
+// chain from the anchor to the window root and, on each real ancestor, force
+// `childViewControllerForPointerLock` to return the next controller toward the anchor. Each forced
+// value is a genuine direct child (we follow the actual containment chain), so the system's
+// downward walk reaches the anchor and reads its `prefersPointerLocked`.
+//
+// The forcing is per-INSTANCE — an associated object — gated behind a one-time per-CLASS IMP
+// swizzle. Only the specific controllers in the anchor's chain are affected; every other instance
+// of those classes keeps its original behavior (associated object nil → original IMP). The forced
+// values are cleared on disengage so the long-lived SwiftUI parents don't retain a stale controller
+// across sessions. Only the PUBLIC `childViewControllerForPointerLock` selector is touched
+// (App-Store-safe; no private API).
+
+#if os(iOS)
+import ObjectiveC
+import UIKit
+
+enum PointerLockChain {
+    private static var forcedChildKey: UInt8 = 0
+    /// Classes whose `childViewControllerForPointerLock` we've already IMP-swizzled (keyed by the
+    /// class object). Main-thread only — pointer-lock resolution and capture toggles are all main.
+    private static var swizzledClasses = Set<ObjectIdentifier>()
+    /// Ancestors we've stamped with a forced child this engagement, held weakly so a deallocated
+    /// SwiftUI controller drops out on its own (no dangling). disengage() clears every one — even
+    /// if the live `parent` chain has since broken — so a stamped parent can never retain a stale
+    /// controller subtree across sessions. One anchor is ever engaged at a time.
+    private static let stampedParents = NSHashTable<UIViewController>.weakObjects()
+
+    private static func forcedChild(of vc: UIViewController) -> UIViewController? {
+        objc_getAssociatedObject(vc, &forcedChildKey) as? UIViewController
+    }
+
+    private static func setForcedChild(_ child: UIViewController?, on vc: UIViewController) {
+        // RETAIN: while steering, the parent must keep the toward-anchor child alive. It's also
+        // already a strong child of `vc` via UIKit containment, so this adds no cycle (the reverse
+        // `.parent` link is weak), and disengage() always clears it — so it can't outlive a session.
+        objc_setAssociatedObject(vc, &forcedChildKey, child, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
+    }
+
+    /// Ensure `cls`'s `childViewControllerForPointerLock` getter consults the per-instance forced
+    /// child first, falling back to the class's original implementation. Idempotent per class.
+    private static func ensureSwizzled(_ cls: AnyClass) {
+        let id = ObjectIdentifier(cls)
+        guard !swizzledClasses.contains(id) else { return }
+        swizzledClasses.insert(id)
+        let selector = #selector(getter: UIViewController.childViewControllerForPointerLock)
+        guard let method = class_getInstanceMethod(cls, selector) else { return }
+        let originalIMP = method_getImplementation(method)
+        typealias OriginalFn = @convention(c) (AnyObject, Selector) -> UIViewController?
+        let original = unsafeBitCast(originalIMP, to: OriginalFn.self)
+        let forwarding: @convention(block) (UIViewController) -> UIViewController? = { vc in
+            if let forced = forcedChild(of: vc) { return forced }
+            return original(vc, selector)
+        }
+        method_setImplementation(method, imp_implementationWithBlock(forwarding))
+    }
+
+    /// Force every ancestor of `anchor` to forward pointer-lock resolution toward it, then ask the
+    /// system to re-resolve. No-op when `anchor` isn't in a view-controller hierarchy yet (it
+    /// re-runs from the anchor's appearance/parent callbacks once it is).
+    static func engage(_ anchor: UIViewController) {
+        disengage(anchor) // clear any prior engagement first (reparent / re-anchor)
+        var child = anchor
+        while let parent = child.parent {
+            ensureSwizzled(object_getClass(parent)!)
+            setForcedChild(child, on: parent)
+            stampedParents.add(parent)
+            child = parent
+        }
+        anchor.setNeedsUpdateOfPrefersPointerLocked()
+    }
+
+    /// Clear the forced forwarding on every stamped ancestor (so the SwiftUI parents stop retaining
+    /// the anchor's subtree) and re-resolve to drop the lock.
+    static func disengage(_ anchor: UIViewController) {
+        for parent in stampedParents.allObjects {
+            setForcedChild(nil, on: parent)
+        }
+        stampedParents.removeAllObjects()
+        anchor.setNeedsUpdateOfPrefersPointerLocked()
+    }
+}
+#endif

clients/apple/Sources/PunktfunkKit/Probe444Blobs.swift

@@ -0,0 +1,36 @@
+// Synthetic 4:4:4 HEVC keyframes used only by `Stage444Probe` to probe decode capability.
+//
+// Each is the first IDR access unit (VPS + SPS + PPS + IDR slice, Annex-B) of a 256×256 HEVC
+// Range-Extensions clip — `chroma_format_idc = 3` — generated offline with libx265:
+//   ffmpeg -f lavfi -i color=c=gray:s=256x256:r=30:d=0.1 -frames:v 3 \
+//          -pix_fmt yuv444p[10le] -c:v libx265 \
+//          -x265-params keyint=1:min-keyint=1:no-info=1:repeat-headers=1:aud=0 -f hevc out.hevc
+// 256×256 clears the hardware decoder's minimum-dimension floor (a 16×16 clip is rejected for every
+// chroma format). Validated to hardware-decode to `444v`/`x444` on Apple Silicon (M3).
+enum Probe444Blobs {
+    /// 256×256 HEVC Range-Extensions 4:4:4 keyframe (Annex-B): 134 bytes.
+    static let au444_8bit: [UInt8] = [
+        0x00, 0x00, 0x00, 0x01, 0x40, 0x01, 0x0c, 0x01, 0xff, 0xff, 0x04, 0x08, 0x00, 0x00, 0x03, 0x00,
+        0x9e, 0x28, 0x00, 0x00, 0x03, 0x00, 0x00, 0x3c, 0xba, 0x02, 0x40, 0x00, 0x00, 0x00, 0x01, 0x42,
+        0x01, 0x01, 0x04, 0x08, 0x00, 0x00, 0x03, 0x00, 0x9e, 0x28, 0x00, 0x00, 0x03, 0x00, 0x00, 0x3c,
+        0x90, 0x01, 0x01, 0x00, 0x80, 0xb2, 0xdd, 0x49, 0x26, 0x57, 0x80, 0xb4, 0x04, 0x00, 0x00, 0x03,
+        0x00, 0x04, 0x00, 0x00, 0x03, 0x00, 0x78, 0x20, 0x00, 0x00, 0x00, 0x01, 0x44, 0x01, 0xc1, 0x72,
+        0x86, 0x0c, 0x06, 0x24, 0x00, 0x00, 0x00, 0x01, 0x28, 0x01, 0xaf, 0x72, 0x15, 0xe8, 0x34, 0xeb,
+        0xae, 0xfb, 0xfe, 0x75, 0x57, 0xca, 0xc1, 0x71, 0x43, 0x16, 0xf5, 0xc2, 0x40, 0xbd, 0x80, 0xa6,
+        0x65, 0x35, 0x20, 0x28, 0x81, 0xa2, 0x5e, 0xc0, 0x93, 0x04, 0x10, 0x9b, 0x00, 0x34, 0xe0, 0x87,
+        0x00, 0x00, 0x03, 0x00, 0x5b, 0x40,
+    ]
+
+    /// 256×256 HEVC Range-Extensions 4:4:4 10-bit keyframe (Annex-B): 133 bytes.
+    static let au444_10bit: [UInt8] = [
+        0x00, 0x00, 0x00, 0x01, 0x40, 0x01, 0x0c, 0x01, 0xff, 0xff, 0x04, 0x08, 0x00, 0x00, 0x03, 0x00,
+        0x9c, 0x28, 0x00, 0x00, 0x03, 0x00, 0x00, 0x3c, 0xba, 0x02, 0x40, 0x00, 0x00, 0x00, 0x01, 0x42,
+        0x01, 0x01, 0x04, 0x08, 0x00, 0x00, 0x03, 0x00, 0x9c, 0x28, 0x00, 0x00, 0x03, 0x00, 0x00, 0x3c,
+        0x90, 0x01, 0x01, 0x00, 0x80, 0x9b, 0x2d, 0xd4, 0x92, 0x65, 0x78, 0x0b, 0x40, 0x40, 0x00, 0x00,
+        0x03, 0x00, 0x40, 0x00, 0x00, 0x07, 0x82, 0x00, 0x00, 0x00, 0x01, 0x44, 0x01, 0xc1, 0x72, 0x86,
+        0x0c, 0x06, 0x24, 0x00, 0x00, 0x00, 0x01, 0x28, 0x01, 0xaf, 0x72, 0x15, 0xe8, 0x34, 0xeb, 0xae,
+        0xfb, 0xfe, 0x75, 0x57, 0xca, 0xc1, 0x71, 0x43, 0x16, 0xf5, 0xc2, 0x40, 0xbd, 0x80, 0xa6, 0x65,
+        0x35, 0x20, 0x28, 0x81, 0xa2, 0x5e, 0xc0, 0x93, 0x04, 0x10, 0x9b, 0x00, 0x34, 0xe0, 0x87, 0x00,
+        0x00, 0x03, 0x00, 0x5b, 0x40,
+    ]
+}

clients/apple/Sources/PunktfunkKit/PunktfunkConnection.swift

@@ -182,6 +182,11 @@ public final class PunktfunkConnection {
         case dualSense = 2
         case xboxOne = 3
         case dualShock4 = 4
+        // Valve Steam Controller / Steam Deck (Linux UHID hid-steam hosts). Parity only on Apple —
+        // GameController never surfaces a 0x28DE HID device, so the client can't capture one; these
+        // exist so the resolved type round-trips and name parsing matches the host.
+        case steamController = 5
+        case steamDeck = 6
 
         /// Loose name parsing for env/dev hooks, mirroring the host's
         /// `GamepadPref::from_name`.
@@ -192,6 +197,8 @@ public final class PunktfunkConnection {
             case "dualsense", "ds", "ds5", "ps5": self = .dualSense
             case "xboxone", "xbox-one", "xboxseries", "series": self = .xboxOne
             case "dualshock4", "dualshock", "ds4", "ps4": self = .dualShock4
+            case "steamdeck", "steam-deck", "deck": self = .steamDeck
+            case "steamcontroller", "steam-controller", "steamcon": self = .steamController
             default: return nil
             }
         }
@@ -231,6 +238,13 @@ public final class PunktfunkConnection {
     public private(set) var colorFullRange: Bool = false
     /// Encoded bit depth (8 or 10).
     public private(set) var bitDepth: UInt8 = 8
+    /// The chroma subsampling the host resolved for this session, as the HEVC `chroma_format_idc`:
+    /// `1` = 4:2:0 (every pre-4:4:4 host, and the back-compat default) or `3` = full-chroma 4:4:4
+    /// (only when this client advertised `videoCap444` *and* the host could open a real 4:4:4
+    /// encoder). Drive the decoder's requested pixel format from this. See `isChroma444`.
+    public private(set) var chromaFormat: UInt8 = 1
+    /// Convenience: the resolved stream is full-chroma 4:4:4 (`chroma_format_idc == 3`).
+    public var isChroma444: Bool { chromaFormat == 3 }
     /// True when the negotiated stream is HDR (PQ or HLG transfer) — drive an HDR present path and
     /// drain `nextHdrMeta`.
     public var isHDR: Bool { colorTransfer == 16 || colorTransfer == 18 }
@@ -327,6 +341,9 @@ public final class PunktfunkConnection {
         colorMatrix = mtx
         colorFullRange = fullRange != 0
         bitDepth = depth
+        var cf: UInt8 = 1
+        _ = punktfunk_connection_chroma_format(handle, &cf)
+        chromaFormat = cf
         var ac: UInt8 = 2
         _ = punktfunk_connection_audio_channels(handle, &ac)
         resolvedAudioChannels = ac
@@ -598,6 +615,10 @@ public final class PunktfunkConnection {
     public static let videoCap10Bit: UInt8 = UInt8(PUNKTFUNK_VIDEO_CAP_10BIT)
     /// Video-capability bit: the client can present BT.2020 PQ HDR10 (implies 10-bit).
     public static let videoCapHDR: UInt8 = UInt8(PUNKTFUNK_VIDEO_CAP_HDR)
+    /// Video-capability bit: the client can decode a full-chroma 4:4:4 HEVC stream (Range
+    /// Extensions). Advertise only when the device can *hardware*-decode it (`Stage444Probe`);
+    /// the host then emits 4:4:4 only if it too opted in. `chromaFormat` reflects the real value.
+    public static let videoCap444: UInt8 = UInt8(PUNKTFUNK_VIDEO_CAP_444)
 
     /// Static HDR mastering metadata (SMPTE ST.2086 + content light level) the host sent for an HDR
     /// session. Mirrors the wire/ABI `PunktfunkHdrMeta`; primaries are in ST.2086 **G, B, R** order,

clients/apple/Sources/PunktfunkKit/Resources/Fonts/Geist-OFL.txt

@@ -0,0 +1,93 @@
+Copyright 2024 The Geist Project Authors (https://github.com/vercel/geist-font)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://openfontlicense.org
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

clients/apple/Sources/PunktfunkKit/Resources/LICENSE-APACHE.txt

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
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+
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+          as modifying the License.
+
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+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
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+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
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+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright 2026 unom
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

clients/apple/Sources/PunktfunkKit/Resources/LICENSE-MIT.txt

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 unom
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

clients/apple/Sources/PunktfunkKit/SessionAudio.swift

@@ -177,6 +177,16 @@ public final class SessionAudio {
     private var playbackEngine: AVAudioEngine?
     private var captureEngine: AVAudioEngine?
     private var drainStarted = false
+    #if !os(macOS)
+    /// AVAudioSession `setCategory`/`setActive` are synchronous and block on the audio server, so
+    /// they must not run on the main thread (UI stall — AVFoundation warns about it). PROCESS-WIDE
+    /// (static) so every SessionAudio shares one serial queue: the AVAudioSession is a process
+    /// singleton, and across a reconnect the old session's deactivate must be ordered before the
+    /// new session's activate (a per-instance queue would let them race and leave the new session's
+    /// audio deactivated). stop() enqueues its deactivate promptly so it lands before the next
+    /// session's activate.
+    private static let sessionQueue = DispatchQueue(label: "io.unom.punktfunk.audio.session")
+    #endif
 
     public init(connection: PunktfunkConnection) {
         self.connection = connection
@@ -189,37 +199,60 @@ public final class SessionAudio {
         flag.stop()
     }
 
-    /// Start playback (and, if enabled+authorized, the mic uplink). Empty UIDs = system
+    /// Start playback (and, if enabled+authorized, the mic uplink). Empty UIDs = system default
-    /// default device; on iOS the UIDs are ignored entirely (routes are
+    /// device; on iOS the UIDs are ignored entirely (routes are AVAudioSession-managed). On macOS
-    /// AVAudioSession-managed). Main thread (engine setup); returns after the engines
+    /// the engines start synchronously on the caller's (main) thread. On iOS/tvOS start() is
-    /// start — the mic may start slightly later if the permission prompt is pending.
+    /// ASYNCHRONOUS: it activates the AVAudioSession off the main thread, then starts the engines on
+    /// a later main-queue hop (gated by `!flag.isStopped`) — so playback is live shortly after, not
+    /// on return. The mic may start later still if the permission prompt is pending.
     public func start(speakerUID: String, micUID: String, micEnabled: Bool) {
-        #if os(iOS)
+        #if os(macOS)
-        // Route + policy live in the session, not per-engine: stereo playback, mic
+        // No AVAudioSession on macOS — start the engines directly (caller's thread, as before).
-        // capture when enabled, Bluetooth allowed. Failure is non-fatal (defaults).
+        startEngines(speakerUID: speakerUID, micUID: micUID, micEnabled: micEnabled)
+        #else
+        // Configure + activate the session OFF the main thread (it blocks on the audio server),
+        // then start the engines back on the main thread once it's active — engine routing/format
+        // depend on the active session. A stop() racing in between is caught by the flag guard.
+        Self.sessionQueue.async { [weak self] in
+            guard let self else { return }
+            self.activateAudioSession(micEnabled: micEnabled)
+            DispatchQueue.main.async { [weak self] in
+                guard let self, !self.flag.isStopped else { return }
+                self.startEngines(speakerUID: speakerUID, micUID: micUID, micEnabled: micEnabled)
+            }
+        }
+        #endif
+    }
+
+    #if !os(macOS)
+    /// Route + policy live in the session, not per-engine: stereo playback, mic capture when
+    /// enabled, Bluetooth allowed. Failure is non-fatal (defaults). Runs on `sessionQueue`.
+    private func activateAudioSession(micEnabled: Bool) {
         let session = AVAudioSession.sharedInstance()
         do {
+            #if os(iOS)
             if micEnabled {
-                // .defaultToSpeaker: .playAndRecord otherwise routes to the iPhone
+                // .defaultToSpeaker: .playAndRecord otherwise routes to the iPhone EARPIECE; only
-                // EARPIECE; only affects the built-in route (headphones/BT still win).
+                // affects the built-in route (headphones/BT still win).
                 try session.setCategory(
                     .playAndRecord, mode: .default,
                     options: [.allowBluetoothA2DP, .defaultToSpeaker])
             } else {
                 try session.setCategory(.playback, mode: .default)
             }
+            #else // tvOS — no app-accessible mic
+            try session.setCategory(.playback, mode: .default)
+            #endif
             try session.setActive(true)
         } catch {
             log.warning("AVAudioSession setup failed: \(error.localizedDescription)")
         }
-        #elseif os(tvOS)
+    }
-        do {
+    #endif
-            try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default)
+
-            try AVAudioSession.sharedInstance().setActive(true)
+    /// Build + start the playback engine (and the mic uplink when enabled + authorized). Main
-        } catch {
+    /// thread (engine setup); on iOS/tvOS the session is already active by the time this runs.
-            log.warning("AVAudioSession setup failed: \(error.localizedDescription)")
+    private func startEngines(speakerUID: String, micUID: String, micEnabled: Bool) {
-        }
-        #endif
         startPlayback(speakerUID: speakerUID)
         #if os(tvOS)
         // No app-accessible microphone input on tvOS — playback only.
@@ -258,19 +291,24 @@ public final class SessionAudio {
             capture.stop()
         }
         playback?.stop()
+        #if !os(macOS)
+        // Release the session so audio we interrupted (Music, podcasts) gets its resume cue. Like
+        // activation, setActive is synchronous/blocking — run it on the shared serial session queue
+        // (off the main thread). Enqueued HERE — engines already stopped, and BEFORE the drain wait
+        // below — so across a reconnect it lands ahead of the next session's activate on the shared
+        // queue (otherwise a deferred deactivate could deactivate the new session). Fire-and-forget.
+        Self.sessionQueue.async {
+            do {
+                try AVAudioSession.sharedInstance().setActive(
+                    false, options: .notifyOthersOnDeactivation)
+            } catch {
+                log.warning("AVAudioSession deactivation failed: \(error.localizedDescription)")
+            }
+        }
+        #endif
         if wasDraining {
             _ = drainDone.wait(timeout: .now() + .milliseconds(400))
         }
-        #if !os(macOS)
-        // Release the session so audio we interrupted (Music, podcasts) gets its
-        // resume cue.
-        do {
-            try AVAudioSession.sharedInstance().setActive(
-                false, options: .notifyOthersOnDeactivation)
-        } catch {
-            log.warning("AVAudioSession deactivation failed: \(error.localizedDescription)")
-        }
-        #endif
     }
 
     // MARK: - Playback (host → speaker)

clients/apple/Sources/PunktfunkKit/Stage2Pipeline.swift

@@ -1,21 +1,21 @@
-// Stage-2 presenter orchestrator: a pump thread pulls AUs → VideoDecoder; the decoder's async
+// Stage-2 presenter orchestrator: a pump thread pulls AUs → VideoDecoder; the decoder's async output
-// output drops the newest decoded frame into a 1-slot ring; the hosting view's display link
+// drops the newest decoded frame into a 1-slot ring; the hosting view's display link calls `renderTick`
-// calls `renderTick` once per vsync to draw + present the newest ready frame and stamp
+// once per vsync to draw + present the newest ready frame and stamp capture→present. Mirrors
-// capture→present. Mirrors StreamPump's lifecycle (one per start; cancel is permanent).
+// StreamPump's lifecycle (one per start; cancel is permanent).
 //
-// Threading: the pump runs on its own thread; the decoder callback on a VT thread; `renderTick`
+// Threading: the pump runs on its own thread; the decoder callback on a VT thread; `renderTick` +
-// + `setDrawableSize` + `start`/`stop` on the MAIN thread (the view's CADisplayLink fires there).
+// `start`/`stop` on the MAIN thread (the view's CADisplayLink fires there). Only the ring (lock-guarded)
-// Only the ring + decoder cross threads and both are internally locked.
+// and the decoder/presenter (internally locked / main-hopped) cross threads.
 
 #if canImport(Metal) && canImport(QuartzCore)
 import AVFoundation
 import Foundation
 import QuartzCore
 
-/// Weak-target wrapper for CADisplayLink. The link retains its target, so targeting a view
+/// Weak-target wrapper for CADisplayLink. The link retains its target, so targeting a view directly
-/// directly makes a `view → link → view` cycle that only `invalidate()` breaks — if a teardown
+/// makes a `view → link → view` cycle that only `invalidate()` breaks — if a teardown is ever missed
-/// is ever missed the view leaks and keeps ticking. This proxy holds the handler weakly, so the
+/// the view leaks and keeps ticking. This proxy holds the handler weakly, so the view can deallocate
-/// view can deallocate and its `deinit` invalidate the link.
+/// and its `deinit` invalidate the link.
 public final class DisplayLinkProxy: NSObject {
     private let onTick: (CADisplayLink) -> Void
     public init(_ onTick: @escaping (CADisplayLink) -> Void) { self.onTick = onTick }
@@ -44,10 +44,10 @@ private final class PumpToken: @unchecked Sendable {
     func cancel() { lock.lock(); live = false; lock.unlock() }
 }
 
-/// Throttled host keyframe requests for decode recovery. The decoder's async error callback
+/// Throttled host keyframe requests for decode recovery. The decoder's async error callback (a VT
-/// (a VT thread) and the pump thread (a submit failure) both signal a wedge; this coalesces
+/// thread) and the pump thread (a submit failure) both signal a wedge; this coalesces them so the
-/// them so the control stream isn't flooded while the decode stays stalled for several frames
+/// control stream isn't flooded while the decode stays stalled for several frames until the requested
-/// until the requested IDR lands. Bound to the live connection in `start`, unbound in `stop`.
+/// IDR lands. Bound to the live connection in `start`, unbound in `stop`.
 private final class KeyframeRecovery: @unchecked Sendable {
     private let lock = NSLock()
     private var connection: PunktfunkConnection?
@@ -60,7 +60,7 @@ private final class KeyframeRecovery: @unchecked Sendable {
     func request() {
         lock.lock()
         let now = DispatchTime.now().uptimeNanoseconds
-        let due = lastNs == 0 || now &- lastNs > 250_000_000 // ≥ 250 ms since the last request
+        let due = lastNs == 0 || now &- lastNs > 100_000_000 // ≥ 100 ms since the last request
         if due { lastNs = now }
         let conn = due ? connection : nil
         lock.unlock()
@@ -76,30 +76,36 @@ public final class Stage2Pipeline {
     private let recovery = KeyframeRecovery()
     private var token = PumpToken()
     private var offsetNs: Int64 = 0
+    /// Signalled when the pump thread exits, so `stop()` can join it (bounded) before `decoder.reset()`
+    /// — otherwise a pump iteration already past its `token.isLive` check can rebuild a decode session
+    /// right after the reset (a brief orphan session). `pumpJoinable` is armed by `start`, consumed by
+    /// the first `stop` (so the idempotent second `stop`/deinit doesn't block on an already-drained
+    /// semaphore). start/stop are sequential lifecycle calls, so the plain flag is safe.
+    private let pumpStopped = DispatchSemaphore(value: 0)
+    private var pumpJoinable = false
 
-    /// The Metal layer the hosting view installs + sizes. nil-init fails when Metal is
+    /// The Metal layer the hosting view installs + sizes.
-    /// unavailable so the caller can fall back to stage-1.
     public var layer: CAMetalLayer { presenter.layer }
 
-    /// `presentMeter` records capture→present (the glass-to-glass term). Returns nil if Metal
+    /// `presentMeter` records capture→present (the glass-to-glass term). Returns nil if Metal can't be
-    /// can't be set up (headless / no GPU) — caller falls back to the stage-1 presenter.
+    /// set up (headless / no GPU) — caller falls back to the stage-1 presenter.
     public init?(presentMeter: LatencyMeter) {
-        guard let presenter = MetalVideoPresenter() else { return nil }
+        guard let presenter = MetalVideoPresenter.make() else { return nil }
         self.presenter = presenter
         self.presentMeter = presentMeter
         let ring = ring
         let recovery = recovery
         self.decoder = VideoDecoder(
             onDecoded: { ring.submit($0) },
-            // Async decode failure (a bad P-frame referencing a lost/corrupt IDR): the pump
+            // Async decode failure (a bad P-frame referencing a lost/corrupt IDR): the pump resets to
-            // resets to re-gate on the next IDR, and we ask the host to send one now (infinite
+            // re-gate on the next IDR, and we ask the host to send one now (infinite GOP — it wouldn't
-            // GOP — it wouldn't otherwise come soon). Throttled in KeyframeRecovery.
+            // otherwise come soon). Throttled in KeyframeRecovery.
             onDecodeError: { _ in recovery.request() })
     }
 
-    /// Start pulling AUs into the decoder. `onFrame` fires per AU at receipt (capture→client
+    /// Start pulling AUs into the decoder. MAIN THREAD. `onFrame` fires per AU at receipt (capture→client
-    /// meter, exactly as stage-1); `onSessionEnd` on close. `clockOffsetNs` (host minus client)
+    /// meter, exactly as stage-1); `onSessionEnd` on close. `clockOffsetNs` (host minus client) makes the
-    /// makes the present stamp cross-machine valid.
+    /// present stamp cross-machine valid.
     public func start(
         connection: PunktfunkConnection,
         onFrame: (@Sendable (AccessUnit) -> Void)?,
@@ -108,43 +114,70 @@ public final class Stage2Pipeline {
         offsetNs = connection.clockOffsetNs
         recovery.bind(connection) // arm host-keyframe recovery for this session
         token = PumpToken() // fresh token per start — cancel is permanent (like StreamPump)
+
+        // Configure the decoder's chroma + the layer's initial colorimetry before the first frame. The
+        // chroma subsampling drives only the decode pixel format (orthogonal to HDR/depth); the HDR
+        // config is the Welcome's latched value, which a mid-session flip then overrides per-frame.
+        decoder.setChroma444(connection.isChroma444)
+        presenter.configure(hdr: connection.isHDR)
+
         let token = token
         let decoder = decoder
         let recovery = recovery
+        let presenter = presenter
+        let pumpStopped = pumpStopped
         let thread = Thread {
+            defer { pumpStopped.signal() } // let stop() join the pump (bounded) before decoder.reset()
             var format: CMVideoFormatDescription?
             var lastFramesDropped = connection.framesDropped()
+            // Persistent recovery WANT, not a one-shot edge (see StreamPump for the full rationale):
+            // keep asking until an IDR lands so a request swallowed by the throttle is re-sent.
+            var awaitingIDR = false
+            // 4:4:4 backstop: a run of decode/create failures in a 4:4:4 session means this device can't
+            // decode 4:4:4 at the negotiated resolution (the HW probe clears the common case but not a
+            // resolution-ceiling miss). End cleanly instead of looping on a black screen.
+            var decodeFailRun = 0
             while token.isLive {
                 do {
-                    // Loss recovery (the primary recovery path). The reassembler drops unrecoverable
+                    // Loss recovery (the primary path). The reassembler drops unrecoverable AUs and the
-                    // AUs (framesDropped) and the decoder then conceals the reference-missing delta
+                    // decoder conceals the reference-missing deltas — often WITHOUT an error callback —
-                    // frames that follow — often rendering them WITHOUT an error callback — so the
+                    // so key off the drop count climbing, then keep asking (awaitingIDR) until a fresh
-                    // onDecodeError trigger rarely fires after a real network blip. Ask the host for
+                    // IDR re-anchors decode.
-                    // a fresh IDR whenever the drop count climbs (throttled in KeyframeRecovery).
-                    // Polled every iteration so a total-loss drought recovers the moment packets
-                    // resume and the reassembler counts the gap.
                     let dropped = connection.framesDropped()
                     if dropped > lastFramesDropped {
                         lastFramesDropped = dropped
-                        recovery.request()
+                        awaitingIDR = true
                     }
-                    // Drain any HDR mastering-metadata update (0xCE) and hand it to the decoder, which
+                    if awaitingIDR { recovery.request() }
-                    // attaches it to subsequent HDR frames. Non-blocking; only HDR sessions emit these.
+                    // Drain HDR mastering metadata (0xCE) and hand it to the PRESENTER (→ CAEDRMetadata).
-                    if connection.isHDR, let meta = try? connection.nextHdrMeta(timeoutMs: 0) {
+                    // Polled UNCONDITIONALLY (not gated on connection.isHDR, the fixed Welcome flag): the
-                        decoder.setHdrMeta(meta)
+                    // host sends 0xCE only for HDR, INCLUDING a mid-session SDR→HDR transition (a game
+                    // entering HDR — the host re-inits its encoder) the Welcome flag would never reflect.
+                    // Non-blocking; nil for an SDR stream.
+                    if let meta = try? connection.nextHdrMeta(timeoutMs: 0) {
+                        presenter.setHdrMeta(meta)
                     }
                     guard let au = try connection.nextAU(timeoutMs: 100) else { continue }
                     onFrame?(au)
                     if let f = AnnexB.formatDescription(fromIDR: au.data) {
-                        format = f // refreshed on every IDR (mode changes included)
+                        format = f          // refreshed on every IDR (mode changes included)
+                        awaitingIDR = false // a fresh IDR re-anchored decode — recovery complete
                     }
                     guard let f = format, token.isLive else { continue }
-                    if !decoder.decode(au: au, format: f) {
+                    if decoder.decode(au: au, format: f) {
-                        // Submit/decoder error: drop the session and re-gate on the next IDR's
+                        decodeFailRun = 0
-                        // in-band parameter sets (a delta frame can't recover) — stage-1's policy
+                    } else {
-                        // — and ask the host for that IDR now (infinite GOP; throttled).
+                        // Submit/decoder error: drop the session and re-gate on the next IDR's in-band
+                        // parameter sets (a delta frame can't recover) and keep asking for that IDR.
                         decoder.reset()
-                        recovery.request()
+                        awaitingIDR = true
+                        decodeFailRun += 1
+                        // ~3 s of solid failure in a 4:4:4 session (and only there — a 4:2:0 loss
+                        // recovers within a GOP) ⇒ 4:4:4 isn't decodable here; end the session.
+                        if connection.isChroma444, decodeFailRun >= 180 {
+                            if token.isLive { onSessionEnd?() }
+                            break
+                        }
                     }
                 } catch {
                     if token.isLive { onSessionEnd?() }
@@ -154,27 +187,30 @@ public final class Stage2Pipeline {
         }
         thread.name = "punktfunk-stage2-pump"
         thread.qualityOfService = .userInteractive
+        pumpJoinable = true
         thread.start()
     }
 
-    /// MAIN thread, once per vsync. Present the newest ready frame (if any) and stamp
+    /// MAIN thread, once per vsync. Present the newest ready frame (if any) and stamp capture→present at
-    /// capture→present at `targetPresentNs` — the display link's target present instant, already
+    /// `targetPresentNs` — the display link's target present instant, already converted to
-    /// converted to `CLOCK_REALTIME` (see `realtimeNs(forDisplayLinkTimestamp:)`).
+    /// `CLOCK_REALTIME` (see `realtimeNs(forDisplayLinkTimestamp:)`).
     public func renderTick(targetPresentNs: Int64) {
         guard let frame = ring.take() else { return }
         guard presenter.render(frame.pixelBuffer, isHDR: frame.isHDR) else { return }
         presentMeter.record(ptsNs: frame.ptsNs, atNs: targetPresentNs, offsetNs: offsetNs)
     }
 
-    /// MAIN thread. Keep the drawable matched to the negotiated mode (host can Reconfigure).
+    /// Stop the pump (≤ one poll timeout) and drop the decode session. MAIN THREAD; idempotent. Does not
-    public func setDrawableSize(_ size: CGSize) {
+    /// close the connection. A restart needs a fresh Stage2Pipeline (cancel is permanent).
-        presenter.setDrawableSize(size)
-    }
-
-    /// Stop the pump (≤ one poll timeout) and drop the decode session. Does not close the
-    /// connection. A restart needs a fresh Stage2Pipeline (cancel is permanent).
     public func stop() {
         token.cancel()
+        // Join the pump (bounded: ≤ one nextAU poll + an in-flight decode) before resetting the decoder,
+        // so the pump can't rebuild a session right after the reset. Only the first stop joins; a
+        // repeat/deinit stop skips the already-drained semaphore.
+        if pumpJoinable {
+            pumpJoinable = false
+            _ = pumpStopped.wait(timeout: .now() + 0.5)
+        }
         decoder.reset()
         recovery.bind(nil) // stop requesting keyframes once the session is torn down
     }
@@ -182,8 +218,8 @@ public final class Stage2Pipeline {
     deinit { token.cancel() }
 
     /// Convert a `CADisplayLink.targetTimestamp` (CACurrentMediaTime basis) to a `CLOCK_REALTIME`
-    /// nanosecond instant — the present clock the AU pts + skew offset live in. Projects to the
+    /// nanosecond instant — the present clock the AU pts + skew offset live in. Projects to the target
-    /// target present time (when the frame is actually on glass), not the moment we drew.
+    /// present time (when the frame is actually on glass), not the moment we drew.
     public static func realtimeNs(forDisplayLinkTimestamp t: CFTimeInterval) -> Int64 {
         let caNow = CACurrentMediaTime()
         var ts = timespec()

clients/apple/Sources/PunktfunkKit/Stage444Probe.swift

@@ -0,0 +1,83 @@
+// Runtime 4:4:4 HEVC decode-capability probe.
+//
+// We advertise `VIDEO_CAP_444` (so the host upgrades to a full-chroma 4:4:4 stream) ONLY when this
+// device can decode 4:4:4 HEVC *in hardware* — software 4:4:4 decode works but is far too slow for a
+// real-time stream at the negotiated resolution, so a software-only device must keep 4:2:0.
+//
+// `VTIsHardwareDecodeSupported(HEVC)` and the HEVC-decoder-capabilities dictionary report HEVC HW
+// decode but expose nothing about `chroma_format_idc`, so the only reliable signal is to actually
+// create a *hardware-required* `VTDecompressionSession` for a tiny synthetic 4:4:4 keyframe and
+// confirm it both creates and decodes to the expected biplanar 4:4:4 pixel format. Validated on an
+// Apple M3 (HW 4:4:4 8- and 10-bit decode to `444v`/`x444`); a software-only decoder fails the
+// hardware-required create and we fall back to 4:2:0.
+//
+// The probe blobs are 256×256 (above the hardware decoder's minimum-dimension floor — a 16×16 clip
+// is rejected for ALL chroma formats, including 4:2:0) HEVC Range-Extensions keyframes generated
+// offline with libx265; see scripts notes. Results are cached (device-static) in lazy statics.
+
+import CoreMedia
+import CoreVideo
+import Foundation
+import VideoToolbox
+
+public enum Stage444Probe {
+    /// True iff this device hardware-decodes 8-bit 4:4:4 HEVC (the host's current 4:4:4 path —
+    /// BT.709 limited `yuv444p`). Cached after first evaluation.
+    public static let hwDecode444_8bit: Bool = probeHardware444(
+        au: Probe444Blobs.au444_8bit,
+        want: kCVPixelFormatType_444YpCbCr8BiPlanarVideoRange,
+        fullRangeSibling: kCVPixelFormatType_444YpCbCr8BiPlanarFullRange)
+
+    /// True iff this device hardware-decodes 10-bit 4:4:4 HEVC (the 4:4:4 ∩ HDR/10-bit intersection).
+    /// Cached after first evaluation.
+    public static let hwDecode444_10bit: Bool = probeHardware444(
+        au: Probe444Blobs.au444_10bit,
+        want: kCVPixelFormatType_444YpCbCr10BiPlanarVideoRange,
+        fullRangeSibling: kCVPixelFormatType_444YpCbCr10BiPlanarFullRange)
+
+    /// Create a hardware-REQUIRED `VTDecompressionSession` for the synthetic 4:4:4 keyframe and
+    /// decode it, returning true only when the decoder produces the expected (video- or full-range)
+    /// biplanar 4:4:4 pixel format. Any failure (no hardware path, wrong output format, decode error)
+    /// → false → we keep 4:2:0.
+    private static func probeHardware444(
+        au auBytes: [UInt8], want: OSType, fullRangeSibling: OSType
+    ) -> Bool {
+        let data = Data(auBytes)
+        guard let format = AnnexB.formatDescription(fromIDR: data) else { return false }
+        // Require a hardware decoder — a software false-positive would make us advertise 4:4:4 and
+        // then decode every real frame on the CPU, blowing the latency budget.
+        let spec: [CFString: Any] = [
+            kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder: true,
+        ]
+        let attrs: [CFString: Any] = [
+            kCVPixelBufferPixelFormatTypeKey: want,
+            kCVPixelBufferMetalCompatibilityKey: true,
+        ]
+        var session: VTDecompressionSession?
+        let created = VTDecompressionSessionCreate(
+            allocator: kCFAllocatorDefault, formatDescription: format,
+            decoderSpecification: spec as CFDictionary, imageBufferAttributes: attrs as CFDictionary,
+            outputCallback: nil, decompressionSessionOut: &session)
+        guard created == noErr, let session else { return false }
+        defer { VTDecompressionSessionInvalidate(session) }
+
+        let au = AccessUnit(data: data, ptsNs: 0, frameIndex: 0, flags: 0)
+        guard let sample = AnnexB.sampleBuffer(au: au, format: format) else { return false }
+
+        var produced: OSType = 0
+        let done = DispatchSemaphore(value: 0)
+        let status = VTDecompressionSessionDecodeFrame(
+            session, sampleBuffer: sample,
+            flags: [._EnableAsynchronousDecompression], infoFlagsOut: nil
+        ) { status, _, imageBuffer, _, _ in
+            if status == noErr, let imageBuffer {
+                produced = CVPixelBufferGetPixelFormatType(imageBuffer)
+            }
+            done.signal()
+        }
+        guard status == noErr else { return false }
+        VTDecompressionSessionWaitForAsynchronousFrames(session)
+        _ = done.wait(timeout: .now() + 1.0)
+        return produced == want || produced == fullRangeSibling
+    }
+}

clients/apple/Sources/PunktfunkKit/StreamPump.swift

@@ -6,6 +6,9 @@
 
 import AVFoundation
 import Foundation
+import os
+
+private let pumpLog = Logger(subsystem: "io.unom.punktfunk", category: "video")
 
 /// Cancellation handle owned by exactly one pump thread — a restart hands the old pump
 /// its own token, so it can never be revived by a newer start().
@@ -47,44 +50,74 @@ final class StreamPump {
             var format: CMVideoFormatDescription?
             var lastKeyframeRequest = Date.distantPast
             var lastFramesDropped = connection.framesDropped()
-            // Coalesced host keyframe request: the decode stays wedged for several frames until
+            // Recovery is a persistent WANT, not a one-shot edge: set it on detected loss (or a
-            // the IDR lands, so requesting on every frame would flood the control stream.
+            // decoder reset), retry the throttled request EVERY iteration, and clear it only when a
+            // fresh IDR actually re-anchors decode. The old code advanced `lastFramesDropped` on the
+            // same edge it fired the throttled request — so a request swallowed by the throttle (a
+            // second drop within the window, e.g. the lost recovery IDR itself being pruned) was
+            // never re-sent: the counter went flat, the climb never re-fired, and the picture stayed
+            // frozen for good while audio kept playing. The iPhone's lossy Wi-Fi hits this where the
+            // Mac's Ethernet never does.
+            var awaitingIDR = false
+            var awaitingSince = Date.distantPast // when the current recovery began (for the resume log)
+            var wasFailed = false
+            // Coalesced host keyframe request. 100 ms throttle (matches the working Android path):
+            // fast enough that a lost recovery IDR is re-requested promptly, bounded so a sustained
+            // freeze can't flood the control stream.
             func requestKeyframeThrottled() {
                 let now = Date()
-                if now.timeIntervalSince(lastKeyframeRequest) > 0.25 {
+                if now.timeIntervalSince(lastKeyframeRequest) > 0.1 {
                     connection.requestKeyframe()
                     lastKeyframeRequest = now
                 }
             }
             while token.isLive {
                 do {
-                    // Loss recovery (the primary recovery path). Under the host's infinite GOP the
+                    // Loss recovery (the primary path). Under the host's infinite GOP the only
-                    // only recovery keyframe is one we request. The reassembler drops unrecoverable
+                    // recovery keyframe is one we request. The reassembler drops unrecoverable AUs
-                    // AUs (framesDropped); the decoder then *conceals* the reference-missing delta
+                    // (framesDropped); the decoder then *conceals* the reference-missing deltas — a
-                    // frames that follow — a frozen / garbage picture, WITHOUT flipping the layer to
+                    // frozen / garbage picture that never flips the layer to .failed — so key off the
-                    // .failed — so the .failed check below rarely fires after a real network blip.
+                    // drop count climbing, then keep asking (awaitingIDR) until an IDR lands. Polled
-                    // Ask the host for a fresh IDR whenever the drop count climbs. Polled every
+                    // every iteration so a total-loss drought still recovers when packets resume.
-                    // iteration (not just per AU) so a total-loss drought still recovers the moment
-                    // packets resume and the reassembler counts the gap.
                     let dropped = connection.framesDropped()
                     if dropped > lastFramesDropped {
+                        // Log only on the false→true transition (once per recovery cycle), not per
+                        // dropped AU, so heavy loss doesn't spam the log.
+                        if !awaitingIDR {
+                            awaitingSince = Date()
+                            pumpLog.notice(
+                                "video: unrecoverable drop (framesDropped=\(dropped, privacy: .public)) — requesting recovery IDR")
+                        }
                         lastFramesDropped = dropped
-                        requestKeyframeThrottled()
+                        awaitingIDR = true
                     }
+                    if awaitingIDR { requestKeyframeThrottled() }
+
                     guard let au = try connection.nextAU(timeoutMs: 100) else { continue }
                     onFrame?(au)
-                    if let f = AnnexB.formatDescription(fromIDR: au.data) {
+                    let idrFormat = AnnexB.formatDescription(fromIDR: au.data)
-                        format = f // refreshed on every IDR (mode changes included)
+                    if let f = idrFormat {
+                        format = f          // refreshed on every IDR (mode changes included)
+                        if awaitingIDR {
+                            let ms = Int(Date().timeIntervalSince(awaitingSince) * 1000)
+                            pumpLog.notice("video: recovery IDR received — resumed after \(ms, privacy: .public) ms")
+                        }
+                        awaitingIDR = false // a fresh IDR re-anchored decode — recovery complete
                     }
-                    if layer.status == .failed {
+                    let failed = layer.status == .failed
+                    if failed {
                         // Decode wedged hard (the cold-first-connect case — a lost/corrupt opening
-                        // IDR): flush and re-gate on the next in-band parameter sets (resuming with
+                        // IDR): flush and, unless THIS AU is the recovering IDR (re-anchored above),
-                        // a delta frame can't recover), AND ask the host for a fresh IDR. Throttled:
+                        // re-gate on the next in-band parameter sets and keep asking — enqueuing a
-                        // the layer stays .failed across several polls until the IDR lands.
+                        // delta into a failed layer can't recover it.
+                        if !wasFailed { pumpLog.warning("video: display layer .failed — flushing + re-anchoring") }
                         layer.flush()
-                        format = AnnexB.formatDescription(fromIDR: au.data)
+                        if idrFormat == nil {
-                        requestKeyframeThrottled()
+                            format = nil
+                            awaitingIDR = true
+                        }
                     }
+                    wasFailed = failed
                     guard let f = format,
                           let sample = AnnexB.sampleBuffer(au: au, format: f),
                           token.isLive // don't enqueue a stale frame after a restart

clients/apple/Sources/PunktfunkKit/StreamView.swift

@@ -137,8 +137,8 @@ public struct StreamView: NSViewRepresentable {
 public final class StreamLayerView: NSView {
     private let displayLayer = AVSampleBufferDisplayLayer()
     private var pump: StreamPump?
-    /// Stage-2 presenter (opt-in via `punktfunk.presenter`): a CAMetalLayer sublayer driven by a
+    /// Stage-2 presenter (default): a CAMetalLayer sublayer driven by a display link instead of the
-    /// display link instead of the StreamPump → displayLayer path. nil = stage-1 (default).
+    /// StreamPump → displayLayer path. nil = stage-1 (Metal-unavailable fallback / DEBUG toggle).
     var presentMeter: LatencyMeter?
     private var stage2: Stage2Pipeline?
     private var stage2Link: CADisplayLink?
@@ -245,6 +245,15 @@ public final class StreamLayerView: NSView {
         layoutMetalLayer() // keep the stage-2 sublayer aspect-fit to the view
     }
 
+    public override func setFrameSize(_ newSize: NSSize) {
+        super.setFrameSize(newSize)
+        // `layout()` isn't guaranteed on a manual-frame (no-Auto-Layout) live resize, so the
+        // stage-2 metal sublayer's drawableSize could stay at the old size while the view grows —
+        // the compositor then upscales a too-small drawable and the video turns blocky. Resize the
+        // drawable here too so it always tracks the window's pixel size (no stale upscale).
+        layoutMetalLayer()
+    }
+
     // MARK: - Capture state machine
 
     /// Clicking into the video engages capture; that click is local (engagement), so
@@ -549,10 +558,17 @@ public final class StreamLayerView: NSView {
         cursorVisible = false
         _ = connection.resolvedCompositor // (was: Auto → gamescope; kept to document intent)
 
-        // Presenter choice — default stage-1 (the known-good AVSampleBufferDisplayLayer). Stage-2
+        // Presenter choice — stage-2 is the DEFAULT (explicit VTDecompressionSession decode + a
-        // (`punktfunk.presenter == "stage2"`) takes explicit VTDecompressionSession decode + a
+        // CAMetalLayer/display-link present): it can detect + recover a wedged decoder where
-        // CAMetalLayer/display-link present; it falls back here if Metal can't be set up.
+        // stage-1's AVSampleBufferDisplayLayer freezes hard on a lost HEVC reference. Stage-1 is
-        if UserDefaults.standard.string(forKey: DefaultsKey.presenter) == "stage2",
+        // reachable only via the DEBUG presenter toggle; release always takes stage-2 (the stage-1
+        // pump below stays the automatic fallback if Metal is missing).
+        #if DEBUG
+        let forceStage1 = UserDefaults.standard.string(forKey: DefaultsKey.presenter) == "stage1"
+        #else
+        let forceStage1 = false
+        #endif
+        if !forceStage1,
            let meter = presentMeter,
            let pipeline = Stage2Pipeline(presentMeter: meter) {
             startStage2(pipeline, connection: connection, onFrame: onFrame, onSessionEnd: onSessionEnd)
@@ -593,9 +609,11 @@ public final class StreamLayerView: NSView {
             targetPresentNs: Stage2Pipeline.realtimeNs(forDisplayLinkTimestamp: link.targetTimestamp))
     }
 
-    /// Aspect-fit the metal sublayer in the view (the host streams at the client's native mode,
+    /// Position the metal sublayer aspect-fit in the view (the host streams at the client's native
-    /// so this is usually the full bounds; it letterboxes a resized window). drawableSize is the
+    /// mode, so this is usually the full bounds; it letterboxes a resized window). Only the layer
-    /// layer's pixel size — the fullscreen-triangle shader scales the decoded texture to fill it.
+    /// FRAME is set here — the presenter sizes the drawable to the decoded frame and the layer's
+    /// contentsGravity (.resizeAspect) scales it to this frame via the system compositor, so a
+    /// resized window rescales through the system's filter (matching stage-1) instead of the shader.
     private func layoutMetalLayer() {
         guard let metalLayer, let connection else { return }
         let mode = connection.currentMode()
@@ -604,14 +622,12 @@ public final class StreamLayerView: NSView {
                 aspectRatio: CGSize(width: Int(mode.width), height: Int(mode.height)),
                 insideRect: bounds)
             : bounds
-        let scale = window?.backingScaleFactor ?? 1
         // No implicit resize animation; refresh contentsScale on a retina↔non-retina move.
         CATransaction.begin()
         CATransaction.setDisableActions(true)
-        metalLayer.contentsScale = scale
+        metalLayer.contentsScale = window?.backingScaleFactor ?? 1
         metalLayer.frame = fit
         CATransaction.commit()
-        stage2?.setDrawableSize(CGSize(width: fit.width * scale, height: fit.height * scale))
     }
 
     public override func viewDidChangeBackingProperties() {
@@ -622,7 +638,7 @@ public final class StreamLayerView: NSView {
     private func teardownStage2() {
         stage2Link?.invalidate()
         stage2Link = nil
-        stage2?.stop()
+        stage2?.stop() // stops the pump (synchronous join) + drops the decode session
         stage2 = nil
         metalLayer?.removeFromSuperlayer()
         metalLayer = nil

clients/apple/Sources/PunktfunkKit/StreamViewIOS.swift

@@ -11,13 +11,18 @@
 // host mode, so the host's rescale is the identity).
 //
 // A hardware mouse/trackpad is a pointer, not a finger. When the scene is pointer-LOCKED
-// (full-screen + frontmost iPad) GCMouse delivers raw relative deltas and the system hides
+// (full-screen + frontmost iPad, and the user hasn't disabled pointer capture in Settings —
-// the cursor — the gaming-grade path. When it CAN'T lock (Stage Manager, not frontmost,
+// see PointerLockChain, which steers the lock request through SwiftUI's hosting controllers)
-// iPhone) the system shows its own cursor and routes the mouse through UIKit's pointer path:
+// GCMouse delivers raw relative deltas and the system hides the cursor — the gaming-grade path.
-// hover + indirect-pointer touches, which we forward as ABSOLUTE cursor position (+ buttons)
+// InputCapture handles EVERY connected mouse (GCMouse.mice), not just the current one, so a
-// so the host cursor tracks the visible local one. We never forward an indirect pointer as a
+// trackpad + a second pointer (e.g. a Universal Control mouse) both drive. When the scene CAN'T
-// touch — doing so hid the cursor and made the host see taps instead of a moving mouse.
+// lock (Stage Manager, not frontmost, iPhone, capture disabled) the system shows its own cursor
-// GCMouse is gated off whenever the lock isn't held so the two paths can't double-send.
+// and routes the mouse through UIKit's pointer path: hover + indirect-pointer touches, which we
+// forward as ABSOLUTE cursor position (+ buttons) so the host cursor tracks the visible local one.
+// We never forward an indirect pointer as a touch — doing so hid the cursor and made the host see
+// taps instead of a moving mouse. The two paths are mutually exclusive on `gcMouseForwarding`
+// (== locked): GCMouse forwards only WHILE locked, the UIKit indirect path (motion, buttons AND
+// scroll) only while NOT locked — so a pointer that emits both channels under lock can't double-send.
 // Hardware keyboard forwarding shares InputCapture with macOS — auto-engaged when streaming
 // starts, ⌘⎋ toggles (detected from the HID stream; there is no NSEvent monitor here).
 //
@@ -92,8 +97,8 @@ public final class StreamViewController: UIViewController {
     public private(set) var connection: PunktfunkConnection?
     private var pump: StreamPump?
     private var observers: [NSObjectProtocol] = []
-    /// Stage-2 presenter (opt-in via `punktfunk.presenter`): a CAMetalLayer sublayer driven by a
+    /// Stage-2 presenter (default): a CAMetalLayer sublayer driven by a CADisplayLink instead of the
-    /// CADisplayLink instead of the StreamPump → displayLayer path. nil = stage-1 (default).
+    /// StreamPump → displayLayer path. nil = stage-1 (Metal-unavailable fallback / DEBUG toggle).
     var presentMeter: LatencyMeter?
     private var stage2: Stage2Pipeline?
     private var stage2Link: CADisplayLink?
@@ -136,6 +141,13 @@ public final class StreamViewController: UIViewController {
 
     public override func loadView() {
         view = StreamLayerUIView()
+        // Re-size the stage-2 drawable if the display scale changes without a bounds change (e.g.
+        // moving to an external display at a different scale) — the iOS analogue of macOS's
+        // viewDidChangeBackingProperties relayout. The handler takes the VC as its argument, so it
+        // doesn't capture self (no retain cycle with the registration).
+        registerForTraitChanges([UITraitDisplayScale.self]) { (vc: StreamViewController, _) in
+            vc.layoutMetalLayer()
+        }
         #if os(iOS)
         // Hide the iPadOS cursor while it hovers the video: the host renders its own
         // cursor from our deltas, so the local one only diverges from it. This hides the
@@ -148,19 +160,58 @@ public final class StreamViewController: UIViewController {
     }
 
     #if os(iOS)
-    // Pointer lock is only meaningful on iPad (iPhone has no hardware-pointer lock) and
+    /// Whether the user wants the mouse/trackpad pointer CAPTURED (pointer lock → relative
-    // only when capture is engaged. The system additionally requires full-screen + frontmost
+    /// movement, the gaming default) rather than forwarded as an absolute position (desktop
-    // and may drop it (Slide Over/Stage Manager/backgrounding) — verified in setCaptured().
+    /// use). Read live from UserDefaults so it tracks the Settings toggle; defaults to on when
-    public override var prefersPointerLocked: Bool {
+    /// unset. iPad-only — gated again in `prefersPointerLocked`.
-        captured && UIDevice.current.userInterfaceIdiom == .pad
+    private var pointerCaptureEnabled: Bool {
+        UserDefaults.standard.object(forKey: DefaultsKey.pointerCapture) as? Bool ?? true
     }
+
+    /// Whether the pointer should be CAPTURED right now: iPad, capture engaged, and the user
+    /// hasn't opted into the absolute (desktop) pointer. The system additionally requires
+    /// full-screen + frontmost and may drop the lock (Slide Over/Stage Manager/backgrounding) —
+    /// syncPointerLock() handles the actual grant/drop and falls back to absolute when unlocked.
+    private var wantsPointerLock: Bool {
+        captured && pointerCaptureEnabled && UIDevice.current.userInterfaceIdiom == .pad
+    }
+
+    public override var prefersPointerLocked: Bool { wantsPointerLock }
     public override var prefersHomeIndicatorAutoHidden: Bool { true }
 
-    // If SwiftUI's UIHostingController reparents us, a plain container parent that forwards
+    // NOTE: we deliberately do NOT override `childViewControllerForPointerLock`. The default
-    // its pointer-lock decision to its children will then reach this VC. (UIHostingController
+    // returns nil, which tells the system to use THIS controller's own `prefersPointerLocked` —
-    // itself does not consult children, which is why GCMouse deltas can never arrive there —
+    // exactly what we want, since `PointerLockChain` forces our SwiftUI ancestors to forward the
-    // the touch path, always forwarded, is the unconditional fallback.)
+    // downward walk to us and we are the terminal anchor. Returning `self` here would make the
-    public override var childViewControllerForPointerLock: UIViewController? { self }
+    // system ask the same controller forever (it keeps delegating to the returned child) →
+    // unbounded recursion → stack overflow once the chain actually reaches us.
+
+    /// (Re)build or tear down the forced pointer-lock forwarding chain from this controller to the
+    /// window root so the system actually resolves our `prefersPointerLocked`. Safe to call
+    /// repeatedly — it no-ops until the view is in a window with a parent chain, and re-runs from
+    /// the appearance/parent callbacks once SwiftUI has placed us.
+    private func updatePointerLockChain() {
+        // Engaging needs a live parent chain to the window root; disengaging is always safe and
+        // must run even after the view has left the window (session teardown) so the stamped
+        // SwiftUI ancestors are cleared.
+        if wantsPointerLock, view.window != nil {
+            PointerLockChain.engage(self)
+        } else {
+            PointerLockChain.disengage(self)
+        }
+    }
+
+    public override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        // SwiftUI places us in the hierarchy AFTER start()'s setCaptured(true), and may reparent us
+        // later — re-anchor the chain here so a lock requested before we had a parent still lands.
+        updatePointerLockChain()
+    }
+
+    public override func didMove(toParent parent: UIViewController?) {
+        super.didMove(toParent: parent)
+        updatePointerLockChain() // chain shape changed — re-anchor (or no-op if not yet in a window)
+    }
     #endif
 
     func start(
@@ -190,18 +241,22 @@ public final class StreamViewController: UIViewController {
             guard self?.captureEnabled == true else { return }
             connection?.send(event)
         }
-        // Indirect pointer (mouse/trackpad with no lock) → absolute cursor + buttons, routed
+        // Indirect pointer (mouse/trackpad) WITHOUT a lock → absolute cursor + buttons + scroll.
-        // through InputCapture so the forwarding gate and release-on-blur apply uniformly.
+        // While the scene is pointer-LOCKED the GCMouse path owns motion AND buttons AND scroll, so
+        // the whole UIKit indirect path is gated off here (`gcMouseForwarding`). The trackpad and a
+        // mouse BOTH report through GCMouse under lock and ALSO emit UIKit indirect-pointer events
+        // (pinned at the locked position) — without this gate a click double-sends (GCMouse + UIKit)
+        // and a second pointer (e.g. a Universal Control mouse) competes with the trackpad. The gate
+        // is the exact mirror of the GCMouse handlers, which fire only while locked.
         streamView.onPointerMoveAbs = { [weak self] p in
-            self?.inputCapture?.sendMouseAbs(
+            guard let self, self.inputCapture?.gcMouseForwarding == false else { return }
+            self.inputCapture?.sendMouseAbs(
                 x: p.x, y: p.y, surfaceWidth: p.w, surfaceHeight: p.h)
         }
         streamView.onPointerButton = { [weak self] button, down in
-            self?.inputCapture?.sendMouseButton(button, pressed: down)
+            guard let self, self.inputCapture?.gcMouseForwarding == false else { return }
+            self.inputCapture?.sendMouseButton(button, pressed: down)
         }
-        // Trackpad two-finger / wheel scroll → host scroll. The pan recognizer is the
-        // UNLOCKED regime; while locked, GCMouse's scroll handler owns it — mirror the
-        // sendMouseAbs !gcMouseForwarding gate so the two can't double-send.
         streamView.onScroll = { [weak self] dx, dy in
             guard let self, self.inputCapture?.gcMouseForwarding == false else { return }
             self.inputCapture?.sendScroll(dx: dx, dy: dy)
@@ -219,10 +274,17 @@ public final class StreamViewController: UIViewController {
         inputCapture = capture
         #endif
 
-        // Presenter choice — default stage-1 (the known-good AVSampleBufferDisplayLayer). Stage-2
+        // Presenter choice — stage-2 is the DEFAULT (VTDecompressionSession decode + a
-        // (`punktfunk.presenter == "stage2"`) takes VTDecompressionSession decode + a
+        // CAMetalLayer/display-link present): it can detect + recover a wedged decoder, where
-        // CAMetalLayer/display-link present; falls back here if Metal can't be set up.
+        // stage-1's AVSampleBufferDisplayLayer freezes hard on a lost HEVC reference frame with no
-        if UserDefaults.standard.string(forKey: DefaultsKey.presenter) == "stage2",
+        // way to recover. Stage-1 is reachable only via the DEBUG presenter toggle; release always
+        // takes stage-2 (the stage-1 pump below stays the automatic fallback if Metal is missing).
+        #if DEBUG
+        let forceStage1 = UserDefaults.standard.string(forKey: DefaultsKey.presenter) == "stage1"
+        #else
+        let forceStage1 = false
+        #endif
+        if !forceStage1,
            let meter = presentMeter,
            let pipeline = Stage2Pipeline(presentMeter: meter) {
             startStage2(pipeline, connection: connection, onFrame: onFrame, onSessionEnd: onSessionEnd)
@@ -300,8 +362,8 @@ public final class StreamViewController: UIViewController {
         onFrame: (@Sendable (AccessUnit) -> Void)?, onSessionEnd: (@Sendable () -> Void)?
     ) {
         let metal = pipeline.layer
-        metal.contentsScale = streamView.contentScaleFactor
         // Composites OVER the idle (un-enqueued in stage-2) AVSampleBufferDisplayLayer base.
+        // (contentsScale + frame are set by layoutMetalLayer() just below.)
         streamView.layer.addSublayer(metal)
         metalLayer = metal
         stage2 = pipeline
@@ -325,9 +387,20 @@ public final class StreamViewController: UIViewController {
         layoutMetalLayer()
     }
 
-    /// Aspect-fit the metal sublayer in the view (the host streams at the client's native mode,
+    /// The display scale to render the metal drawable at. `traitCollection.displayScale` is the
-    /// so this is usually the full bounds). drawableSize is the layer's pixel size; the shader's
+    /// canonical render scale and is reliable once the controller is in the hierarchy;
-    /// fullscreen triangle scales the decoded texture to fill it.
+    /// `view.contentScaleFactor` can read 1.0 before the view attaches to a window/screen, which
+    /// would size the drawable at point resolution → a pixelated, upscaled mess. Falls back to the
+    /// main screen scale if the trait is still unspecified.
+    private var renderScale: CGFloat {
+        let s = traitCollection.displayScale
+        return s > 0 ? s : UIScreen.main.scale
+    }
+
+    /// Position the metal sublayer aspect-fit in the view (the host streams at the client's native
+    /// mode, so this is usually the full bounds). Only the layer FRAME is set here — the presenter
+    /// sizes the drawable to the decoded frame and the layer's contentsGravity (.resizeAspect)
+    /// scales it to this frame via the system compositor (matching stage-1's videoGravity).
     private func layoutMetalLayer() {
         guard let metalLayer, let connection else { return }
         let mode = connection.currentMode()
@@ -337,19 +410,17 @@ public final class StreamViewController: UIViewController {
                 aspectRatio: CGSize(width: Int(mode.width), height: Int(mode.height)),
                 insideRect: bounds)
             : bounds
-        let scale = streamView.contentScaleFactor
         CATransaction.begin()
         CATransaction.setDisableActions(true) // don't animate the resize
-        metalLayer.contentsScale = scale
+        metalLayer.contentsScale = renderScale
         metalLayer.frame = fit
         CATransaction.commit()
-        stage2?.setDrawableSize(CGSize(width: fit.width * scale, height: fit.height * scale))
     }
 
     private func teardownStage2() {
         stage2Link?.invalidate()
         stage2Link = nil
-        stage2?.stop()
+        stage2?.stop() // stops the pump (synchronous join) + drops the decode session
         stage2 = nil
         metalLayer?.removeFromSuperlayer()
         metalLayer = nil
@@ -369,6 +440,7 @@ public final class StreamViewController: UIViewController {
             captured = false
         }
         setNeedsUpdateOfPrefersPointerLocked()
+        updatePointerLockChain() // (re)anchor the SwiftUI ancestors so the lock actually resolves
         syncPointerLock() // resolve cursor + GCMouse/absolute routing for the current state
         let onCaptureChange = onCaptureChange
         let captured = captured

clients/apple/Sources/PunktfunkKit/VideoDecoder.swift

@@ -49,11 +49,10 @@ public final class VideoDecoder: @unchecked Sendable {
     /// pump can re-gate on the next IDR.
     private let onDecodeError: @Sendable (OSStatus) -> Void
 
-    /// Latest source HDR mastering metadata (from `PunktfunkConnection.nextHdrMeta`), attached to
+    /// Whether the negotiated stream is full-chroma 4:4:4 (`connection.isChroma444`), set once at
-    /// each decoded HDR pixel buffer so the compositor tone-maps from the real grade. Guarded by its
+    /// session start before any decode. Selects the 4:4:4 decode pixel format (orthogonal to bit
-    /// own lock — written by the pump thread, read on the VT decode callback.
+    /// depth / HDR). Read inside `createSessionLocked` under `lock`.
-    private let metaLock = NSLock()
+    private var chroma444 = false
-    private var hdrMeta: PunktfunkConnection.HdrMeta?
 
     public init(
         onDecoded: @escaping @Sendable (ReadyFrame) -> Void,
@@ -65,12 +64,13 @@ public final class VideoDecoder: @unchecked Sendable {
 
     deinit { teardown() }
 
-    /// Set the source HDR mastering metadata (drained from `PunktfunkConnection.nextHdrMeta`). It's
+    /// Select the chroma subsampling of the decode output (4:2:0 vs full-chroma 4:4:4). Call once at
-    /// attached to subsequent decoded HDR pixel buffers. Thread-safe; cheap to call on each update.
+    /// session start, before decoding, from `connection.isChroma444`. Takes effect on the next
-    public func setHdrMeta(_ meta: PunktfunkConnection.HdrMeta) {
+    /// session (re)build. Thread-safe.
-        metaLock.lock()
+    public func setChroma444(_ on: Bool) {
-        hdrMeta = meta
+        lock.lock()
-        metaLock.unlock()
+        chroma444 = on
+        lock.unlock()
     }
 
     /// Submit one AU for asynchronous decode, (re)creating the session if `format` changed. The
@@ -135,8 +135,10 @@ public final class VideoDecoder: @unchecked Sendable {
 
     /// True when `newFormat` carries a PQ (SMPTE ST 2084) or HLG transfer function — i.e. the host
     /// is sending HDR (BT.2020). VideoToolbox populates the transfer-function extension from the
-    /// HEVC VUI, so this tracks the *stream*, switching dynamically when the user toggles HDR
+    /// HEVC VUI, so this picks the decode bit depth (10-bit P010/x444 vs 8-bit NV12/444v) from the
-    /// (the host re-emits parameter sets with the new VUI → a new format desc → session rebuild).
+    /// stream. The present-side HDR config (colorspace/EDR/shader) is latched once per session from
+    /// the Welcome (`connection.isHDR`), which the host does NOT flip mid-session — so this predicate
+    /// and that config agree for the session (a `#if DEBUG` assert in the presenter guards it).
     static func isHDRFormat(_ format: CMVideoFormatDescription) -> Bool {
         guard
             let tf = CMFormatDescriptionGetExtension(
@@ -157,11 +159,18 @@ public final class VideoDecoder: @unchecked Sendable {
         session = nil
         format = nil
 
+        // Decode pixel format is a 2×2 of (chroma, depth/HDR), both biplanar so the presenter binds
+        // plane 0 = luma, plane 1 = interleaved chroma uniformly — 4:4:4 just delivers a full-size
+        // chroma plane. 10-bit (P010 / `x444`) for HDR (PQ/HLG), 8-bit (NV12 / `444v`) otherwise.
         let hdr = Self.isHDRFormat(newFormat)
-        let pixelFormat =
+        let pixelFormat: OSType = {
-            hdr
+            switch (chroma444, hdr) {
-            ? kCVPixelFormatType_420YpCbCr10BiPlanarVideoRange // P010 (10-bit)
+            case (false, false): return kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange // NV12
-            : kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange // NV12 (8-bit)
+            case (false, true): return kCVPixelFormatType_420YpCbCr10BiPlanarVideoRange // P010
+            case (true, false): return kCVPixelFormatType_444YpCbCr8BiPlanarVideoRange // 444v
+            case (true, true): return kCVPixelFormatType_444YpCbCr10BiPlanarVideoRange // x444
+            }
+        }()
         let imageAttrs: [CFString: Any] = [
             kCVPixelBufferMetalCompatibilityKey: true,
             kCVPixelBufferPixelFormatTypeKey: pixelFormat,
@@ -169,11 +178,20 @@ public final class VideoDecoder: @unchecked Sendable {
         var callback = VTDecompressionOutputCallbackRecord(
             decompressionOutputCallback: decoderOutputCallback,
             decompressionOutputRefCon: Unmanaged.passUnretained(self).toOpaque())
+        // 4:4:4 sessions REQUIRE a hardware decoder: we only advertise 4:4:4 when the hardware probe
+        // passed, so a hardware-incapable mode (e.g. a resolution past the HW 4:4:4 ceiling) must fail
+        // HERE, synchronously, letting the pump's backstop end the session — rather than silently
+        // falling back to a software 4:4:4 decoder far too slow for a real-time stream. 4:2:0 keeps the
+        // software fallback (nil spec) as a robustness net.
+        let spec: CFDictionary? =
+            chroma444
+            ? [kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder: true] as CFDictionary
+            : nil
         var newSession: VTDecompressionSession?
         let status = VTDecompressionSessionCreate(
             allocator: kCFAllocatorDefault,
             formatDescription: newFormat,
-            decoderSpecification: nil, // hardware by default
+            decoderSpecification: spec,
             imageBufferAttributes: imageAttrs as CFDictionary,
             outputCallback: &callback,
             decompressionSessionOut: &newSession)
@@ -195,26 +213,17 @@ public final class VideoDecoder: @unchecked Sendable {
         // pts was stamped at timescale 1e9 (AnnexB.sampleBuffer); normalize defensively.
         let p = CMTimeConvertScale(pts, timescale: 1_000_000_000, method: .default)
         let ptsNs = p.value > 0 ? UInt64(p.value) : 0
-        // HDR iff the decoder produced a 10-bit P010 buffer (we only request P010 for PQ streams).
+        // HDR iff the decoder produced a 10-bit buffer (we only request a 10-bit format for PQ/HLG
+        // streams). Covers 4:2:0 (P010) and 4:4:4 (`x444`), video- and full-range, so a 10-bit 4:4:4
+        // HDR frame isn't misclassified as SDR. (The mastering metadata is applied to the presenter's
+        // CAMetalLayer via CAEDRMetadata, not to this source buffer — a separate-drawable presenter
+        // never composites the source buffer's attachments, so attaching them here would be dead.)
+        let fmt = CVPixelBufferGetPixelFormatType(imageBuffer)
         let isHDR =
-            CVPixelBufferGetPixelFormatType(imageBuffer)
+            fmt == kCVPixelFormatType_420YpCbCr10BiPlanarVideoRange
-            == kCVPixelFormatType_420YpCbCr10BiPlanarVideoRange
+            || fmt == kCVPixelFormatType_420YpCbCr10BiPlanarFullRange
-        // Attach the source's mastering display + content light level (ST.2086 / CEA-861.3) so the
+            || fmt == kCVPixelFormatType_444YpCbCr10BiPlanarVideoRange
-        // compositor tone-maps from the real grade rather than inferring from the PQ colourspace
+            || fmt == kCVPixelFormatType_444YpCbCr10BiPlanarFullRange
-        // alone. The SEI byte payloads map 1:1 to these CVImageBuffer attachment keys.
-        if isHDR {
-            metaLock.lock()
-            let meta = hdrMeta
-            metaLock.unlock()
-            if let meta {
-                CVBufferSetAttachment(
-                    imageBuffer, kCVImageBufferMasteringDisplayColorVolumeKey,
-                    meta.masteringDisplayColorVolume() as CFData, .shouldPropagate)
-                CVBufferSetAttachment(
-                    imageBuffer, kCVImageBufferContentLightLevelInfoKey,
-                    meta.contentLightLevelInfo() as CFData, .shouldPropagate)
-            }
-        }
         onDecoded(
             ReadyFrame(ptsNs: ptsNs, decodedNs: decodedNs, pixelBuffer: imageBuffer, isHDR: isHDR))
     }

clients/apple/Tests/PunktfunkKitTests/MetalPresenterTests.swift

@@ -0,0 +1,69 @@
+import XCTest
+
+#if canImport(Metal)
+import CoreVideo
+import Metal
+import QuartzCore
+@testable import PunktfunkKit
+
+final class MetalPresenterTests: XCTestCase {
+    /// `MetalVideoPresenter.make()` compiles the runtime Metal shaders (the BT.709/BT.2020 YUV→RGB
+    /// fragment shaders plus the Catmull-Rom luma sampler). A `nil` result on a GPU-equipped host
+    /// means a shader failed to compile — this catches a malformed shader before it silently
+    /// degrades stage-2 to a stage-1 fallback on device.
+    func testPresenterInitCompilesShaders() throws {
+        guard MTLCreateSystemDefaultDevice() != nil else {
+            throw XCTSkip("no Metal device available in this environment")
+        }
+        XCTAssertNotNil(
+            MetalVideoPresenter.make(),
+            "stage-2 Metal shaders failed to compile (presenter init returned nil)")
+    }
+
+    /// The HDR fix: `configure(hdr:)` must put the layer into the BT.2020-PQ EDR configuration with a
+    /// reference-white anchor (`edrMetadata`) — the missing anchor was what made HDR render "too
+    /// bright". SDR must use the plain 8-bit path with EDR off and no metadata. A mid-session flip is a
+    /// per-mode reconfigure, so the round trip back to SDR must fully restore the SDR config.
+    func testConfigureHDRSetsEDRAnchor() throws {
+        guard let presenter = MetalVideoPresenter.make() else {
+            throw XCTSkip("no Metal device available in this environment")
+        }
+        presenter.configure(hdr: true)
+        XCTAssertEqual(presenter.layer.pixelFormat, .rgba16Float, "HDR uses an EDR-capable drawable")
+        XCTAssertNotNil(presenter.layer.colorspace, "HDR layer must be tagged (itur_2100_PQ)")
+        XCTAssertTrue(
+            presenter.layer.wantsExtendedDynamicRangeContent, "EDR must be requested on all platforms")
+        XCTAssertNotNil(
+            presenter.layer.edrMetadata,
+            "HDR must anchor reference white via edrMetadata (the fix for 'too bright')")
+
+        // Mid-session HDR→SDR flip: the 8-bit path, EDR off, no metadata.
+        presenter.configure(hdr: false)
+        XCTAssertEqual(presenter.layer.pixelFormat, .bgra8Unorm, "SDR uses the plain 8-bit drawable")
+        XCTAssertFalse(presenter.layer.wantsExtendedDynamicRangeContent)
+        XCTAssertNil(presenter.layer.edrMetadata)
+    }
+
+    /// `render` with a freshly-allocated NV12 buffer must present without crashing or hanging — the
+    /// main-thread present path is the highest-risk part of the stage-2 rewrite. (A headless CI with no
+    /// display can still allocate a drawable from a CAMetalLayer; if it can't, render returns false,
+    /// which is also a valid non-crashing outcome.)
+    func testRenderDoesNotCrashOnNV12Frame() throws {
+        guard let presenter = MetalVideoPresenter.make() else {
+            throw XCTSkip("no Metal device available in this environment")
+        }
+        presenter.configure(hdr: false)
+        var pb: CVPixelBuffer?
+        let attrs: [CFString: Any] = [kCVPixelBufferMetalCompatibilityKey: true]
+        let status = CVPixelBufferCreate(
+            kCFAllocatorDefault, 256, 256, kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange,
+            attrs as CFDictionary, &pb)
+        guard status == kCVReturnSuccess, let pixelBuffer = pb else {
+            throw XCTSkip("could not allocate a test pixel buffer")
+        }
+        // Just asserting it returns (true or false) without trapping — the layer may have no drawable
+        // source headless, so a false return is acceptable.
+        _ = presenter.render(pixelBuffer, isHDR: false)
+    }
+}
+#endif

clients/apple/Tests/PunktfunkKitTests/Stage444Tests.swift

@@ -0,0 +1,68 @@
+// 4:4:4 decode-path coverage: the hardware-capability probe is stable/cached, and a real 4:4:4 HEVC
+// keyframe decodes through VideoDecoder to a biplanar 4:4:4 pixel buffer. Reuses the same synthetic
+// 4:4:4 blobs the runtime probe ships with.
+
+import CoreVideo
+import VideoToolbox
+import XCTest
+@testable import PunktfunkKit
+
+private final class FrameBox: @unchecked Sendable {
+    let lock = NSLock()
+    var frame: ReadyFrame?
+    var error: OSStatus?
+}
+
+final class Stage444Tests: XCTestCase {
+    /// The capability probe is device-static and cached — reading it twice must return the same value
+    /// (and must never crash, including where 4:4:4 is unsupported → false).
+    func testProbeIsStableAndCached() {
+        XCTAssertEqual(Stage444Probe.hwDecode444_8bit, Stage444Probe.hwDecode444_8bit)
+        XCTAssertEqual(Stage444Probe.hwDecode444_10bit, Stage444Probe.hwDecode444_10bit)
+    }
+
+    /// A real 8-bit 4:4:4 HEVC keyframe (the embedded probe blob) decodes through `VideoDecoder` with
+    /// `setChroma444(true)` to a 256×256 biplanar 4:4:4 (`444v`/`444f`) buffer classified SDR.
+    /// (4:4:4 sessions require a hardware decoder — skip where there isn't one, which is exactly where
+    /// the client wouldn't advertise 4:4:4 anyway.)
+    func testVideoDecoderDecodes444() throws {
+        try XCTSkipUnless(
+            Stage444Probe.hwDecode444_8bit, "no hardware 4:4:4 decode on this device")
+        let data = Data(Probe444Blobs.au444_8bit)
+        let format = try XCTUnwrap(
+            AnnexB.formatDescription(fromIDR: data), "the 4:4:4 blob must yield a format description")
+        let au = AccessUnit(data: data, ptsNs: 7_000_000, frameIndex: 0, flags: 0)
+
+        let box = FrameBox()
+        let done = DispatchSemaphore(value: 0)
+        let decoder = VideoDecoder(
+            onDecoded: { f in box.lock.lock(); box.frame = f; box.lock.unlock(); done.signal() },
+            onDecodeError: { s in box.lock.lock(); box.error = s; box.lock.unlock(); done.signal() })
+        decoder.setChroma444(true)
+
+        XCTAssertTrue(decoder.decode(au: au, format: format), "4:4:4 frame submit should succeed")
+        XCTAssertEqual(done.wait(timeout: .now() + 10), .success, "the decode callback must fire")
+        decoder.reset()
+
+        box.lock.lock(); let frame = box.frame; let error = box.error; box.lock.unlock()
+        XCTAssertNil(error.map { "decode error \($0)" })
+        let ready = try XCTUnwrap(frame, "a 4:4:4 ReadyFrame must be delivered")
+        XCTAssertEqual(CVPixelBufferGetWidth(ready.pixelBuffer), 256)
+        XCTAssertEqual(CVPixelBufferGetHeight(ready.pixelBuffer), 256)
+        let pf = CVPixelBufferGetPixelFormatType(ready.pixelBuffer)
+        XCTAssertTrue(
+            pf == kCVPixelFormatType_444YpCbCr8BiPlanarVideoRange
+                || pf == kCVPixelFormatType_444YpCbCr8BiPlanarFullRange,
+            "expected a biplanar 4:4:4 8-bit buffer, got \(fourCCString(pf))")
+        XCTAssertFalse(ready.isHDR, "an 8-bit BT.709 4:4:4 stream is SDR")
+        // The chroma plane (plane 1) must be FULL resolution for 4:4:4 (vs half for 4:2:0) — this is
+        // what lets the unchanged shader sample chroma at the luma UV.
+        XCTAssertEqual(CVPixelBufferGetWidthOfPlane(ready.pixelBuffer, 1), 256)
+        XCTAssertEqual(CVPixelBufferGetHeightOfPlane(ready.pixelBuffer, 1), 256)
+    }
+
+    private func fourCCString(_ t: OSType) -> String {
+        let b = [UInt8(t >> 24 & 0xff), UInt8(t >> 16 & 0xff), UInt8(t >> 8 & 0xff), UInt8(t & 0xff)]
+        return String(bytes: b, encoding: .ascii) ?? "\(t)"
+    }
+}

clients/decky/src/index.tsx

@@ -294,7 +294,13 @@ const RESOLUTIONS: [number, number, string][] = [
   [2560, 1440, "2560 × 1440"],
 ];
 const REFRESH = [0, 30, 60, 90, 120];
-const GAMEPADS = ["auto", "xbox360", "dualsense"];
+const GAMEPADS = ["auto", "xbox360", "dualsense", "steamdeck"];
+const GAMEPAD_LABELS: Record<string, string> = {
+  auto: "Automatic",
+  xbox360: "Xbox 360",
+  dualsense: "DualSense",
+  steamdeck: "Steam Deck",
+};
 
 const SettingsSection: FC = () => {
   const [s, setS] = useState<StreamSettings | null>(null);
@@ -355,14 +361,17 @@ const SettingsSection: FC = () => {
       />
       <Field label="Gamepad type" childrenContainerWidth="max">
         <Dropdown
-          rgOptions={GAMEPADS.map((g) => ({
+          rgOptions={GAMEPADS.map((g) => ({ data: g, label: GAMEPAD_LABELS[g] ?? g }))}
-            data: g,
-            label: g === "auto" ? "Automatic" : g === "xbox360" ? "Xbox 360" : "DualSense",
-          }))}
           selectedOption={s.gamepad}
           onChange={(o) => patch({ gamepad: o.data as string })}
         />
       </Field>
+      {s.gamepad === "steamdeck" && (
+        <Field
+          label="⚠ Disable Steam Input"
+          description="Steam Deck mode forwards the paddles, both trackpads, and gyro to the host. For that, Steam Input must be OFF for punktfunk: on the game page tap ⚙ → Controller Settings → set Steam Input to Off. Otherwise Steam keeps the Deck's controls and only the sticks + buttons reach the host."
+        />
+      )}
       <ToggleField
         label="Stream microphone"
         checked={s.mic_enabled}

clients/decky/src/steam.ts

@@ -113,12 +113,35 @@ async function ensureShortcut(): Promise<number> {
   return appId;
 }
 
+/**
+ * Best-effort: turn Steam Input OFF for our shortcut so SDL's HIDAPI Steam Deck driver can open the
+ * Deck's controls (paddles · trackpads · gyro) directly. There is no confirmed-stable SteamClient
+ * API for this, so it is feature-detected and MUST never block or throw into the launch — the manual
+ * toggle (game page → ⚙ → Controller Settings → Steam Input Off, surfaced in the plugin Settings) is
+ * the documented source of truth. No-op when the optional API is absent.
+ */
+function disableSteamInputForShortcut(appId: number): void {
+  try {
+    const input = (
+      SteamClient as unknown as {
+        Input?: { SetSteamInputEnabledForApp?: (appId: number, enabled: boolean) => void };
+      }
+    ).Input;
+    input?.SetSteamInputEnabledForApp?.(appId, false);
+  } catch {
+    /* a controller tweak must never break the launch */
+  }
+}
+
 /**
  * Launch a stream to `host:port` fullscreen in Gaming Mode. Encodes the target into the
  * shortcut's launch options (so one generic shortcut serves every host), then RunGame.
  */
 export async function launchStream(host: string, port: number): Promise<void> {
   const appId = await ensureShortcut();
+  // Best-effort so the Deck's rich controls reach the client; no-op if the API is absent (the user
+  // disables Steam Input manually — see the Settings instruction).
+  disableSteamInputForShortcut(appId);
   const target = port && port !== 9777 ? `${host}:${port}` : host;
   // KEY=value ... %command% — the wrapper reads PF_HOST from the environment.
   SteamClient.Apps.SetAppLaunchOptions(appId, `PF_HOST=${target} %command%`);

clients/linux/src/app.rs

@@ -295,19 +295,21 @@ fn initiate_connect(app: Rc<App>, req: ConnectRequest) {
                 // Rule 3a: the host opted into reduced-security TOFU; offer it alongside PIN.
                 tofu_dialog(app, req);
             } else {
-                // Rule 3b: pair=required or unknown policy — PIN pairing is mandatory.
+                // Rule 3b: pair=required or unknown policy — offer no-PIN delegated approval
-                pin_dialog(app, req);
+                // (request access → approve in the console) or the PIN ceremony.
+                approval_dialog(app, req);
             }
         }
         None => {
             // Manual entry (no advertised fingerprint). A known address connects silently
-            // on its stored pin (rule 1); an unknown one must pair — never silent TOFU.
+            // on its stored pin (rule 1); an unknown one must pair — request access (approve in
+            // the console) or use a PIN; never silent TOFU.
             match known
                 .find_by_addr(&req.addr, req.port)
                 .and_then(|k| crate::trust::parse_hex32(&k.fp_hex))
             {
                 Some(pin) => start_session(app, req, Some(pin)),
-                None => pin_dialog(app, req), // rule 3b
+                None => approval_dialog(app, req), // rule 3b
             }
         }
     }
@@ -418,6 +420,83 @@ fn pin_dialog(app: Rc<App>, req: ConnectRequest) {
     dialog.present(Some(&parent));
 }
 
+/// A fresh host that requires pairing: offer the two ways in. "Request access" is the no-PIN
+/// path — connect and wait for the operator to click Approve in the host's console/web UI
+/// (delegated approval); "Use a PIN instead…" runs the SPAKE2 ceremony.
+fn approval_dialog(app: Rc<App>, req: ConnectRequest) {
+    let dialog = adw::AlertDialog::new(
+        Some("Pairing Required"),
+        Some(&format!(
+            "{} requires pairing.\n\nRequest access and approve this device in the host's console \
+             (or web UI) — no PIN needed. Or pair with the 4-digit PIN it can display.",
+            req.name
+        )),
+    );
+    dialog.add_responses(&[
+        ("cancel", "Cancel"),
+        ("pin", "Use a PIN instead…"),
+        ("request", "Request Access"),
+    ]);
+    dialog.set_response_appearance("request", adw::ResponseAppearance::Suggested);
+    dialog.set_default_response(Some("request"));
+    dialog.set_close_response("cancel");
+    let parent = app.window.clone();
+    dialog.connect_response(None, move |_, response| match response {
+        "request" => request_access(app.clone(), req.clone()),
+        "pin" => pin_dialog(app.clone(), req.clone()),
+        _ => {}
+    });
+    dialog.present(Some(&parent));
+}
+
+/// The no-PIN "request access" flow: open an identified connect that the host PARKS until the
+/// operator approves it in the console, showing a cancelable "waiting" dialog meanwhile. On
+/// approval the same connection is admitted (no reconnect) and the host is saved as paired.
+fn request_access(app: Rc<App>, req: ConnectRequest) {
+    // Pin the advertised certificate for a discovered host (defence against a host impostor while
+    // we wait); a manually-typed host has no advertised fingerprint, so trust-on-first-use.
+    let pin = req.fp_hex.as_deref().and_then(crate::trust::parse_hex32);
+    let cancel = Rc::new(std::cell::Cell::new(false));
+
+    let waiting = adw::AlertDialog::new(
+        Some("Waiting for Approval"),
+        Some(&format!(
+            "Approve “{}” in {}’s console or web UI.\n\nThis device is waiting to be let in — it \
+             connects automatically once you approve it.",
+            glib::host_name(),
+            req.name
+        )),
+    );
+    waiting.add_responses(&[("cancel", "Cancel")]);
+    waiting.set_close_response("cancel");
+    {
+        let app = app.clone();
+        let cancel = cancel.clone();
+        waiting.connect_response(Some("cancel"), move |_, _| {
+            // Return the UI immediately; the in-flight connect is left to time out and is torn
+            // down silently by the event loop (see StartOpts::cancel).
+            cancel.set(true);
+            app.busy.set(false);
+            app.toast("Cancelled — the request may still be pending on the host.");
+        });
+    }
+    waiting.present(Some(&app.window));
+
+    start_session_with(
+        app,
+        req,
+        pin,
+        StartOpts {
+            // Must exceed the host's approval window (PENDING_APPROVAL_WAIT) so a slow operator
+            // approval still lands on this connection rather than timing the client out first.
+            connect_timeout: std::time::Duration::from_secs(185),
+            persist_paired: true,
+            waiting: Some(waiting),
+            cancel: Some(cancel),
+        },
+    );
+}
+
 /// Measure the path to a host over the real data plane (Swift's "Test Network Speed…"):
 /// connect, have the host burst probe filler for 2 s up to its 3 Gbps ceiling, report
 /// goodput · loss · a recommended bitrate (≈70 % of measured), and apply it in one tap.
@@ -556,7 +635,42 @@ fn resolve_mode(app: &App) -> punktfunk_core::config::Mode {
     mode
 }
 
+/// Tunables for a session start that differ between the normal connect and the "request access"
+/// (delegated-approval) flow. `Default` is the normal connect.
+struct StartOpts {
+    /// Handshake budget. The request-access flow uses a long one because the host PARKS the
+    /// connection until the operator clicks Approve (see the host's `PENDING_APPROVAL_WAIT`).
+    connect_timeout: std::time::Duration,
+    /// Persist the host as *paired* on a successful connect. Set for request-access, where the
+    /// operator's approval IS the pairing, so future connects are silent (rule 1). Normal TOFU
+    /// persists the host *unpaired* (pinned, but not PIN/approval-verified).
+    persist_paired: bool,
+    /// A "waiting for approval" dialog to dismiss on the first session event (request-access only).
+    waiting: Option<adw::AlertDialog>,
+    /// Set by the waiting dialog's Cancel button. `NativeClient::connect` is a blocking call with
+    /// no abort, so Cancel returns the UI immediately (clears busy, closes the dialog) and leaves
+    /// the in-flight connect to time out; when it finally resolves, the event loop sees this flag
+    /// and tears down silently (drops the connector → closes the connection) without touching the
+    /// UI a new session may already own.
+    cancel: Option<Rc<std::cell::Cell<bool>>>,
+}
+
+impl Default for StartOpts {
+    fn default() -> Self {
+        Self {
+            connect_timeout: std::time::Duration::from_secs(15),
+            persist_paired: false,
+            waiting: None,
+            cancel: None,
+        }
+    }
+}
+
 fn start_session(app: Rc<App>, req: ConnectRequest, pin: Option<[u8; 32]>) {
+    start_session_with(app, req, pin, StartOpts::default());
+}
+
+fn start_session_with(app: Rc<App>, req: ConnectRequest, pin: Option<[u8; 32]>, opts: StartOpts) {
     if app.busy.replace(true) {
         return;
     }
@@ -577,10 +691,14 @@ fn start_session(app: Rc<App>, req: ConnectRequest, pin: Option<[u8; 32]>) {
         audio_channels: s.audio_channels,
         pin,
         identity: app.identity.clone(),
+        connect_timeout: opts.connect_timeout,
     };
     let inhibit = s.inhibit_shortcuts;
     drop(s);
     let tofu = pin.is_none();
+    let persist_paired = opts.persist_paired;
+    let mut waiting = opts.waiting;
+    let cancel = opts.cancel;
 
     let mut handle = crate::session::start(params);
     let frames = std::mem::replace(&mut handle.frames, async_channel::bounded(1).1);
@@ -588,14 +706,41 @@ fn start_session(app: Rc<App>, req: ConnectRequest, pin: Option<[u8; 32]>) {
         let mut frames = Some(frames);
         let mut page: Option<crate::ui_stream::StreamPage> = None;
         while let Ok(event) = handle.events.recv().await {
+            // A cancelled request-access connect resolved late: tear down silently. Don't touch
+            // app.busy — Cancel already cleared it, and a fresh session may now own it.
+            if cancel.as_ref().is_some_and(|c| c.get()) {
+                if let Some(w) = waiting.take() {
+                    w.close();
+                }
+                break;
+            }
             match event {
                 SessionEvent::Connected {
                     connector,
                     mode,
                     fingerprint,
                 } => {
-                    // A TOFU connect just observed the real fingerprint — pin it from now on.
+                    // Dismiss the "waiting for approval" dialog (request-access flow), if any.
-                    if tofu {
+                    if let Some(w) = waiting.take() {
+                        w.close();
+                    }
+                    if persist_paired {
+                        // Request-access: the operator approved this device, so record the host as
+                        // a trusted PAIRED host (pinning the fingerprint we observed) — future
+                        // connects are then silent (rule 1), exactly like after a PIN ceremony.
+                        let fp_hex = crate::trust::hex(&fingerprint);
+                        let mut known = KnownHosts::load();
+                        known.upsert(KnownHost {
+                            name: req.name.clone(),
+                            addr: req.addr.clone(),
+                            port: req.port,
+                            fp_hex,
+                            paired: true,
+                        });
+                        let _ = known.save();
+                        app.toast("Approved — connecting…");
+                    } else if tofu {
+                        // A TOFU connect just observed the real fingerprint — pin it from now on.
                         let fp_hex = crate::trust::hex(&fingerprint);
                         let mut known = KnownHosts::load();
                         known.upsert(KnownHost {
@@ -622,6 +767,7 @@ fn start_session(app: Rc<App>, req: ConnectRequest, pin: Option<[u8; 32]>) {
                         connector,
                         frames.take().expect("Connected delivered once"),
                         app.gamepad.escape_events(),
+                        app.gamepad.disconnect_events(),
                         handle.stop.clone(),
                         inhibit,
                         &title,
@@ -644,6 +790,9 @@ fn start_session(app: Rc<App>, req: ConnectRequest, pin: Option<[u8; 32]>) {
                     msg,
                     trust_rejected,
                 } => {
+                    if let Some(w) = waiting.take() {
+                        w.close();
+                    }
                     tracing::warn!(%msg, trust_rejected, "connect failed");
                     app.busy.set(false);
                     // A pinned connect rejected on trust grounds means the host's cert no
@@ -658,6 +807,9 @@ fn start_session(app: Rc<App>, req: ConnectRequest, pin: Option<[u8; 32]>) {
                     break;
                 }
                 SessionEvent::Ended(err) => {
+                    if let Some(w) = waiting.take() {
+                        w.close();
+                    }
                     app.gamepad.detach();
                     app.nav.pop_to_tag("hosts");
                     if let Some(e) = err {

clients/linux/src/gamepad.rs

@@ -18,7 +18,7 @@ use punktfunk_core::quic::{HidOutput, RichInput};
 use std::collections::HashMap;
 use std::sync::mpsc::{Receiver, Sender};
 use std::sync::{Arc, Mutex};
-use std::time::Duration;
+use std::time::{Duration, Instant};
 
 /// Motion scale constants, shared convention with the Swift client (`GamepadWire`):
 /// derived from hid-playstation's math over the host's fixed calibration blob. SDL hands
@@ -33,8 +33,15 @@ const G: f32 = 9.80665;
 /// is the only way out. Four simultaneous buttons that no game uses as a deliberate
 /// combo, so it can't be triggered by normal play. Still forwarded to the host (the user
 /// is leaving anyway); we only also raise the escape signal.
+///
+/// **Escalation:** a quick press leaves fullscreen / releases capture; *holding* the same
+/// chord for [`DISCONNECT_HOLD`] ends the session. Deliberately NOT the Steam / QAM buttons —
+/// those are the marquee pass-through controls that now reach the host's game-mode UI.
 const ESCAPE_CHORD: [u32; 4] = [wire::BTN_LB, wire::BTN_RB, wire::BTN_START, wire::BTN_BACK];
 
+/// Hold the [`ESCAPE_CHORD`] at least this long to disconnect (escalates the leave-fullscreen press).
+const DISCONNECT_HOLD: Duration = Duration::from_millis(1500);
+
 #[derive(Clone, Debug)]
 pub struct PadInfo {
     pub id: u32,
@@ -58,6 +65,7 @@ impl PadInfo {
             GamepadPref::DualSense => "DualSense",
             GamepadPref::DualShock4 => "DualShock 4",
             GamepadPref::XboxOne => "Xbox One",
+            GamepadPref::SteamDeck => "Steam Deck",
             _ => "",
         }
     }
@@ -89,6 +97,9 @@ pub struct GamepadService {
     /// Fires once per press of the [`ESCAPE_CHORD`]; the stream page consumes it to leave
     /// fullscreen + release capture.
     escape_rx: async_channel::Receiver<()>,
+    /// Fires once when the [`ESCAPE_CHORD`] is held past [`DISCONNECT_HOLD`]; the stream page
+    /// consumes it to end the session (the controller equivalent of Ctrl+Alt+Shift+D).
+    disconnect_rx: async_channel::Receiver<()>,
 }
 
 impl GamepadService {
@@ -98,11 +109,12 @@ impl GamepadService {
         let pinned = Arc::new(Mutex::new(None));
         let (ctl, ctl_rx) = std::sync::mpsc::channel();
         let (escape_tx, escape_rx) = async_channel::unbounded();
+        let (disconnect_tx, disconnect_rx) = async_channel::unbounded();
         let (p, a, pin) = (pads.clone(), active.clone(), pinned.clone());
         if let Err(e) = std::thread::Builder::new()
             .name("punktfunk-gamepad".into())
             .spawn(move || {
-                if let Err(e) = run(&p, &a, &pin, &ctl_rx, &escape_tx) {
+                if let Err(e) = run(&p, &a, &pin, &ctl_rx, &escape_tx, &disconnect_tx) {
                     tracing::warn!(error = %e, "gamepad service ended — pads disabled");
                 }
             })
@@ -115,6 +127,7 @@ impl GamepadService {
             pinned,
             ctl,
             escape_rx,
+            disconnect_rx,
         }
     }
 
@@ -124,6 +137,12 @@ impl GamepadService {
         self.escape_rx.clone()
     }
 
+    /// A receiver that yields one `()` when the escape chord is held past [`DISCONNECT_HOLD`]
+    /// (controller disconnect). A fresh clone per call; the stream page spawns a future on it.
+    pub fn disconnect_events(&self) -> async_channel::Receiver<()> {
+        self.disconnect_rx.clone()
+    }
+
     pub fn pads(&self) -> Vec<PadInfo> {
         self.pads.lock().unwrap().clone()
     }
@@ -188,6 +207,13 @@ fn button_bit(b: sdl3::gamepad::Button) -> Option<u32> {
         Button::DPadLeft => wire::BTN_DPAD_LEFT,
         Button::DPadRight => wire::BTN_DPAD_RIGHT,
         Button::Touchpad => wire::BTN_TOUCHPAD,
+        // Back grips / paddles (Steam Deck L4/L5/R4/R5, Xbox Elite P1–P4) + the misc/Share button.
+        // PADDLE1/2/3/4 = R4/L4/R5/L5 (see the host `input::gamepad`).
+        Button::RightPaddle1 => wire::BTN_PADDLE1,
+        Button::LeftPaddle1 => wire::BTN_PADDLE2,
+        Button::RightPaddle2 => wire::BTN_PADDLE3,
+        Button::LeftPaddle2 => wire::BTN_PADDLE4,
+        Button::Misc1 => wire::BTN_MISC1,
         _ => return None,
     })
 }
@@ -259,11 +285,22 @@ struct Worker {
     /// Wire state of the active pad — zeroed on the wire at switch/detach.
     last_axis: [i32; 6],
     held_buttons: Vec<u32>,
+    /// Touchpad contacts the host believes are down, keyed by `(surface, finger)` — lifted on pad
+    /// switch / detach so a contact held at that moment doesn't stick. surface 0 = the legacy single
+    /// touchpad, 1/2 = a Steam left/right pad.
+    held_touches: std::collections::HashSet<(u8, u8)>,
     last_accel: [i16; 3],
     /// Raises the UI escape signal; the escape chord fires it once per press.
     escape_tx: async_channel::Sender<()>,
+    /// Raises the UI disconnect signal when the escape chord is held past [`DISCONNECT_HOLD`].
+    disconnect_tx: async_channel::Sender<()>,
     /// The escape chord is fully held — latched so it fires once, not every poll.
     chord_armed: bool,
+    /// When the escape chord became fully held (drives the hold-to-disconnect escalation); `None`
+    /// when the chord is broken.
+    chord_since: Option<Instant>,
+    /// The disconnect signal already fired for the current hold — latched so it fires once.
+    disconnect_fired: bool,
 }
 
 impl Worker {
@@ -275,13 +312,22 @@ impl Worker {
 
     fn pad_info(&self, id: u32) -> Option<PadInfo> {
         let pad = self.opened.get(&id)?;
+        let mut pref = pref_for_type(
+            self.subsystem
+                .type_for_id(sdl3::sys::joystick::SDL_JoystickID(id)),
+        );
+        // There is no SDL gamepad type for the Steam Deck / Steam Controller, so detect Valve by
+        // VID/PID (Deck 0x1205, SC wired 0x1102, SC dongle 0x1142) — the host then builds the virtual
+        // hid-steam pad with the back grips + dual trackpads and the right glyph identity.
+        if pad.vendor_id() == Some(0x28DE)
+            && matches!(pad.product_id(), Some(0x1205 | 0x1102 | 0x1142))
+        {
+            pref = GamepadPref::SteamDeck;
+        }
         Some(PadInfo {
             id,
             name: pad.name().unwrap_or_else(|| "Controller".into()),
-            pref: pref_for_type(
+            pref,
-                self.subsystem
-                    .type_for_id(sdl3::sys::joystick::SDL_JoystickID(id)),
-            ),
         })
     }
 
@@ -297,32 +343,90 @@ impl Worker {
                 }
                 *v = i32::MIN;
             }
+            // Lift any touchpad contact the host still believes is down (surface 0 = legacy pad).
+            for (surface, finger) in self.held_touches.drain() {
+                let rich = if surface == 0 {
+                    RichInput::Touchpad {
+                        pad: 0,
+                        finger,
+                        active: false,
+                        x: 0,
+                        y: 0,
+                    }
+                } else {
+                    RichInput::TouchpadEx {
+                        pad: 0,
+                        surface,
+                        finger,
+                        touch: false,
+                        click: false,
+                        x: 0,
+                        y: 0,
+                        pressure: 0,
+                    }
+                };
+                let _ = c.send_rich_input(rich);
+            }
         } else {
             self.held_buttons.clear();
             self.last_axis = [i32::MIN; 6];
+            self.held_touches.clear();
         }
+        // A held chord doesn't survive a flush (detach / pad-switch) — clear its latches too.
+        self.reset_chord();
     }
 
     /// Raise the UI escape signal when the [`ESCAPE_CHORD`] just completed (latched so it
-    /// fires once per press). Called after each button-down updates `held_buttons`.
+    /// fires once per press) and start the hold-to-disconnect timer. Called after each
+    /// button-down updates `held_buttons`.
     fn maybe_fire_escape(&mut self) {
         if self.chord_armed {
             return;
         }
         if ESCAPE_CHORD.iter().all(|b| self.held_buttons.contains(b)) {
             self.chord_armed = true;
+            self.chord_since = Some(Instant::now());
             let _ = self.escape_tx.try_send(());
-            tracing::info!("gamepad escape chord (L1+R1+Start+Select) — leaving fullscreen");
+            tracing::info!(
+                "gamepad escape chord (L1+R1+Start+Select) — leaving fullscreen (hold to disconnect)"
+            );
+        }
+    }
+
+    /// Fire the disconnect signal once the escape chord has been continuously held past
+    /// [`DISCONNECT_HOLD`]. Polled from the main loop so the hold completes without new events.
+    fn maybe_fire_disconnect(&mut self) {
+        if self.disconnect_fired {
+            return;
+        }
+        if let Some(since) = self.chord_since {
+            if since.elapsed() >= DISCONNECT_HOLD {
+                self.disconnect_fired = true;
+                let _ = self.disconnect_tx.try_send(());
+                tracing::info!("gamepad escape chord held — disconnecting");
+            }
         }
     }
 
     /// Re-arm once the chord is broken (any of its buttons released).
     fn rearm_escape(&mut self) {
         if self.chord_armed && !ESCAPE_CHORD.iter().all(|b| self.held_buttons.contains(b)) {
-            self.chord_armed = false;
+            self.reset_chord();
         }
     }
 
+    /// Clear the escape/disconnect chord latches. Called at every session boundary
+    /// ([`flush_held`](Self::flush_held) on detach/pad-switch + on attach): the hold-to-disconnect
+    /// path *always* ends the session while the chord is still physically held, so the matching
+    /// button-up events arrive after detach (dropped by the `attached` guard) and `rearm_escape`
+    /// never runs — without this the latched state would leak into the next session and either
+    /// swallow its first chord press or fire a stale disconnect on connect.
+    fn reset_chord(&mut self) {
+        self.chord_armed = false;
+        self.chord_since = None;
+        self.disconnect_fired = false;
+    }
+
     /// Sensors stream only while a session wants them (they cost USB/BT bandwidth).
     fn set_sensors(&mut self, enabled: bool) {
         let Some(id) = self.active_id() else { return };
@@ -335,6 +439,56 @@ impl Worker {
             }
         }
     }
+
+    /// Forward one touchpad contact on the rich-input plane. A multi-touchpad pad (Steam Deck / Steam
+    /// Controller) sends `TouchpadEx` with the surface (SDL touchpad 0 = left → 1, 1 = right → 2) and
+    /// signed coordinates; a single-touchpad pad (DualSense) keeps the legacy `Touchpad` (unsigned).
+    fn forward_touch(
+        &mut self,
+        which: u32,
+        touchpad: u32,
+        finger: u8,
+        x: f32,
+        y: f32,
+        active: bool,
+    ) {
+        let Some(c) = self.attached.as_ref() else {
+            return;
+        };
+        let multi = self
+            .opened
+            .get(&which)
+            .map(|p| p.touchpads_count() >= 2)
+            .unwrap_or(false);
+        let (cx, cy) = (x.clamp(0.0, 1.0), y.clamp(0.0, 1.0));
+        let surface = if multi { (touchpad as u8) + 1 } else { 0 };
+        let rich = if multi {
+            RichInput::TouchpadEx {
+                pad: 0,
+                surface,
+                finger,
+                touch: active,
+                click: false,
+                x: (cx * 65535.0 - 32768.0) as i16,
+                y: (cy * 65535.0 - 32768.0) as i16,
+                pressure: 0,
+            }
+        } else {
+            RichInput::Touchpad {
+                pad: 0,
+                finger,
+                active,
+                x: (cx * 65535.0) as u16,
+                y: (cy * 65535.0) as u16,
+            }
+        };
+        let _ = c.send_rich_input(rich);
+        if active {
+            self.held_touches.insert((surface, finger));
+        } else {
+            self.held_touches.remove(&(surface, finger));
+        }
+    }
 }
 
 #[allow(clippy::too_many_lines)]
@@ -344,11 +498,18 @@ fn run(
     pinned_out: &Mutex<Option<u32>>,
     ctl: &Receiver<Ctl>,
     escape_tx: &async_channel::Sender<()>,
+    disconnect_tx: &async_channel::Sender<()>,
 ) -> Result<(), String> {
     // Off-main-thread + no video subsystem: keep SDL away from signals, poll pads on its
     // own thread.
     sdl3::hint::set("SDL_NO_SIGNAL_HANDLERS", "1");
     sdl3::hint::set("SDL_JOYSTICK_THREAD", "1");
+    // Let SDL's HIDAPI drivers open Valve Steam Controller / Steam Deck devices directly, so the
+    // paddles, both trackpads, and gyro arrive as first-class SDL gamepad inputs. On a Deck in Game
+    // Mode, Steam Input still holds the device — the user must disable Steam Input for this app (see
+    // the Decky UX); on a desktop client (or a Deck with Steam Input off) the hints just work.
+    sdl3::hint::set("SDL_JOYSTICK_HIDAPI_STEAMDECK", "1");
+    sdl3::hint::set("SDL_JOYSTICK_HIDAPI_STEAM", "1");
     let sdl = sdl3::init().map_err(|e| e.to_string())?;
     let subsystem = sdl.gamepad().map_err(|e| e.to_string())?;
     let mut pump = sdl.event_pump().map_err(|e| e.to_string())?;
@@ -361,9 +522,13 @@ fn run(
         attached: None,
         last_axis: [i32::MIN; 6],
         held_buttons: Vec::new(),
+        held_touches: std::collections::HashSet::new(),
         last_accel: [0; 3],
         escape_tx: escape_tx.clone(),
+        disconnect_tx: disconnect_tx.clone(),
         chord_armed: false,
+        chord_since: None,
+        disconnect_fired: false,
     };
 
     let publish = |w: &Worker| {
@@ -381,6 +546,7 @@ fn run(
                 Ok(Ctl::Attach(c)) => {
                     w.attached = Some(c);
                     w.last_axis = [i32::MIN; 6];
+                    w.reset_chord(); // every session starts un-latched (Attach doesn't flush)
                     w.set_sensors(true);
                 }
                 Ok(Ctl::Detach) => {
@@ -474,9 +640,11 @@ fn run(
                         send(w.attached.as_ref().unwrap(), InputKind::GamepadAxis, id, v);
                     }
                 }
-                // DualSense touchpad → the rich-input plane, normalized 0..=65535.
+                // Touchpad contacts → the rich-input plane. One pad (DualSense) keeps the legacy
+                // `Touchpad`; two pads (Steam Deck / Steam Controller) send `TouchpadEx` per surface.
                 Event::ControllerTouchpadDown {
                     which,
+                    touchpad,
                     finger,
                     x,
                     y,
@@ -484,41 +652,23 @@ fn run(
                 }
                 | Event::ControllerTouchpadMotion {
                     which,
+                    touchpad,
                     finger,
                     x,
                     y,
                     ..
                 } if active == Some(which) && w.attached.is_some() => {
-                    let _ = w
+                    w.forward_touch(which, touchpad as u32, finger as u8, x, y, true);
-                        .attached
-                        .as_ref()
-                        .unwrap()
-                        .send_rich_input(RichInput::Touchpad {
-                            pad: 0,
-                            finger: finger as u8,
-                            active: true,
-                            x: (x.clamp(0.0, 1.0) * 65535.0) as u16,
-                            y: (y.clamp(0.0, 1.0) * 65535.0) as u16,
-                        });
                 }
                 Event::ControllerTouchpadUp {
                     which,
+                    touchpad,
                     finger,
                     x,
                     y,
                     ..
                 } if active == Some(which) && w.attached.is_some() => {
-                    let _ = w
+                    w.forward_touch(which, touchpad as u32, finger as u8, x, y, false);
-                        .attached
-                        .as_ref()
-                        .unwrap()
-                        .send_rich_input(RichInput::Touchpad {
-                            pad: 0,
-                            finger: finger as u8,
-                            active: false,
-                            x: (x.clamp(0.0, 1.0) * 65535.0) as u16,
-                            y: (y.clamp(0.0, 1.0) * 65535.0) as u16,
-                        });
                 }
                 // Motion: accel events update the cache; each gyro event ships a sample
                 // (the DualSense reports both at ~250 Hz). Scale convention shared with
@@ -559,6 +709,10 @@ fn run(
             }
         }
 
+        // Escalate a held escape chord to a disconnect (polled — the hold completes with no
+        // new button events; the chord itself is only detected while a session is attached).
+        w.maybe_fire_disconnect();
+
         // Feedback planes (this thread is their single consumer). The host re-sends
         // rumble state periodically, so a generous duration with refresh-on-update is
         // safe — a dropped stop heals within ~500 ms.

clients/linux/src/session.rs

@@ -27,6 +27,11 @@ pub struct SessionParams {
     /// Pinned host fingerprint; `None` = trust on first use (caller persists the observed one).
     pub pin: Option<[u8; 32]>,
     pub identity: (String, String),
+    /// How long to wait for the handshake. The normal path uses a short budget; the
+    /// "request access" (delegated-approval) path uses a long one, because the host PARKS the
+    /// connection until the operator clicks Approve in its console (so this must exceed the
+    /// host's approval window — see `PENDING_APPROVAL_WAIT`).
+    pub connect_timeout: Duration,
 }
 
 #[derive(Clone, Copy, Default)]
@@ -139,7 +144,7 @@ fn pump(
         None, // launch: the Linux client has no library picker yet
         params.pin,
         Some(params.identity),
-        Duration::from_secs(15),
+        params.connect_timeout,
     ) {
         Ok(c) => Arc::new(c),
         Err(e) => {

clients/linux/src/ui_settings.rs

@@ -19,6 +19,49 @@ const REFRESH: &[u32] = &[0, 30, 60, 90, 120, 144, 165, 240];
 const GAMEPADS: &[&str] = &["auto", "xbox360", "dualsense", "xboxone", "dualshock4"];
 const COMPOSITORS: &[&str] = &["auto", "kwin", "wlroots", "mutter", "gamescope"];
 
+/// punktfunk's own license (MIT OR Apache-2.0), shown on the About dialog's Legal page.
+const APP_LICENSE: &str = concat!(
+    "punktfunk is licensed under MIT OR Apache-2.0, at your option.\n\n",
+    "================================ MIT ================================\n\n",
+    include_str!("../../../LICENSE-MIT"),
+    "\n\n=============================== Apache-2.0 ===============================\n\n",
+    include_str!("../../../LICENSE-APACHE"),
+);
+/// Third-party software notices for the linked Rust crates (generated by
+/// scripts/gen-third-party-notices.sh; shown as a Legal section in the About dialog).
+const THIRD_PARTY_NOTICES: &str = include_str!("../../../THIRD-PARTY-NOTICES.txt");
+
+/// Show the About dialog (app license + the third-party-software Legal section).
+fn show_about(parent: &impl IsA<gtk::Widget>) {
+    let about = adw::AboutDialog::builder()
+        .application_name("punktfunk")
+        .developer_name("unom")
+        .version(env!("CARGO_PKG_VERSION"))
+        .website("https://git.unom.io/unom/punktfunk")
+        .license_type(gtk::License::Custom)
+        .license(APP_LICENSE)
+        .build();
+    // The native (FFmpeg/GTK/PipeWire/SDL3) components are dynamically linked under their own
+    // (LGPL/Zlib/MIT) licenses; the Rust crate notices are the substantive attribution set.
+    about.add_legal_section(
+        "Third-party software (Rust crates)",
+        None,
+        gtk::License::Custom,
+        Some(THIRD_PARTY_NOTICES),
+    );
+    about.add_legal_section(
+        "Third-party software (system libraries)",
+        None,
+        gtk::License::Custom,
+        Some(
+            "This application dynamically links system libraries under their own licenses, \
+             including FFmpeg (LGPL v2.1+), GTK 4 and libadwaita (LGPL v2.1+), PipeWire (MIT), \
+             and SDL 3 (Zlib). Their full license texts are available from each project.",
+        ),
+    );
+    about.present(Some(parent));
+}
+
 pub fn show(
     parent: &impl IsA<gtk::Widget>,
     settings: Rc<RefCell<Settings>>,
@@ -156,9 +199,23 @@ pub fn show(
         .build();
     audio.add(&mic_row);
 
+    let about = adw::PreferencesGroup::builder().title("About").build();
+    let licenses_row = adw::ActionRow::builder()
+        .title("Third-party licenses")
+        .subtitle("Open-source software used by punktfunk")
+        .activatable(true)
+        .build();
+    licenses_row.add_suffix(&gtk::Image::from_icon_name("go-next-symbolic"));
+    {
+        let about_parent: gtk::Widget = parent.clone().upcast();
+        licenses_row.connect_activated(move |_| show_about(&about_parent));
+    }
+    about.add(&licenses_row);
+
     page.add(&stream);
     page.add(&input);
     page.add(&audio);
+    page.add(&about);
 
     // Seed from the current settings.
     {

clients/linux/src/ui_stream.rs

@@ -124,12 +124,13 @@ impl Capture {
     }
 }
 
-#[allow(clippy::too_many_lines)]
+#[allow(clippy::too_many_lines, clippy::too_many_arguments)]
 pub fn new(
     window: &adw::ApplicationWindow,
     connector: Arc<NativeClient>,
     frames: async_channel::Receiver<DecodedFrame>,
     escape_rx: async_channel::Receiver<()>,
+    disconnect_rx: async_channel::Receiver<()>,
     stop: Arc<AtomicBool>,
     inhibit_shortcuts: bool,
     title: &str,
@@ -152,7 +153,7 @@ pub fn new(
     stats_label.set_margin_top(12);
 
     let hint = gtk::Label::new(Some(
-        "Click the stream to capture input · Ctrl+Alt+Shift+Q releases",
+        "Click the stream to capture input · Ctrl+Alt+Shift+Q releases · Ctrl+Alt+Shift+D disconnects",
     ));
     hint.add_css_class("osd");
     hint.set_halign(gtk::Align::Center);
@@ -163,7 +164,9 @@ pub fn new(
     // Flashed when entering fullscreen — the only exit affordances once the header bar is
     // hidden (F11 on a keyboard; the L1+R1+Start+Select chord on a controller, which is the
     // only way out on a Steam Deck).
-    let fs_hint = gtk::Label::new(Some("F11  ·  L1 + R1 + Start + Select  —  exit fullscreen"));
+    let fs_hint = gtk::Label::new(Some(
+        "F11  ·  L1 + R1 + Start + Select  —  exit fullscreen (hold to disconnect)",
+    ));
     fs_hint.add_css_class("osd");
     fs_hint.set_halign(gtk::Align::Center);
     fs_hint.set_valign(gtk::Align::Start);
@@ -297,6 +300,7 @@ pub fn new(
         key.set_propagation_phase(gtk::PropagationPhase::Capture);
         let cap = capture.clone();
         let window_k = window.clone();
+        let stop_kb = stop.clone();
         key.connect_key_pressed(move |_, keyval, keycode, state| {
             let chord = gdk::ModifierType::CONTROL_MASK
                 | gdk::ModifierType::ALT_MASK
@@ -309,6 +313,13 @@ pub fn new(
                 }
                 return glib::Propagation::Stop;
             }
+            // Ctrl+Alt+Shift+D — leave the session. Now that Steam / QAM pass through to the host,
+            // the capture toggle alone can't end a stream, so this is the keyboard's explicit exit.
+            if state.contains(chord) && keyval.to_lower() == gdk::Key::d {
+                cap.release();
+                stop_kb.store(true, Ordering::SeqCst);
+                return glib::Propagation::Stop;
+            }
             if keyval == gdk::Key::F11 {
                 if window_k.is_fullscreen() {
                     window_k.unfullscreen();
@@ -442,6 +453,24 @@ pub fn new(
         })
     };
 
+    // Controller disconnect (escape chord held past the hold threshold) → end the session, the
+    // controller equivalent of Ctrl+Alt+Shift+D. Setting `stop` ends the session pump, which pops
+    // this page (and fires `hidden` below). One-shot — the session is going away.
+    let disconnect_future = {
+        let window = window.clone();
+        let cap = capture.clone();
+        let stop_d = stop.clone();
+        glib::spawn_future_local(async move {
+            if disconnect_rx.recv().await.is_ok() {
+                cap.release();
+                if window.is_fullscreen() {
+                    window.unfullscreen();
+                }
+                stop_d.store(true, Ordering::SeqCst);
+            }
+        })
+    };
+
     // The page's `hidden` fires once navigation away completes (back button, pop on
     // session end) — NOT on the transient unmap/map cycle a NavigationView push performs.
     {
@@ -449,6 +478,7 @@ pub fn new(
         let stop_h = stop.clone();
         let handlers = RefCell::new(Some((fs_handler, active_handler)));
         let escape_future = RefCell::new(Some(escape_future));
+        let disconnect_future = RefCell::new(Some(disconnect_future));
         page.connect_hidden(move |_| {
             tracing::debug!("stream page hidden — ending session");
             if let Some((fs, active)) = handlers.borrow_mut().take() {
@@ -458,6 +488,9 @@ pub fn new(
             if let Some(f) = escape_future.borrow_mut().take() {
                 f.abort();
             }
+            if let Some(f) = disconnect_future.borrow_mut().take() {
+                f.abort();
+            }
             if window.is_fullscreen() {
                 window.unfullscreen();
             }

clients/windows/packaging/pack-msix.ps1

@@ -76,11 +76,29 @@ foreach ($f in $required) {
     Copy-Item $src (Join-Path $layout $f) -Force
 }
 
-# FFmpeg runtime DLLs (the exe link-imports the decode set; copy them all — small and correct)
+# FFmpeg runtime DLLs (the exe link-imports the decode set; copy them all — small and correct).
+# These are unmodified BtbN *lgpl-shared* builds, linked dynamically (replaceable DLLs) — FFmpeg is
+# used under the LGPL v2.1+; the license text + notice ship in licenses\ below.
 $ff = Get-ChildItem -Path $FfmpegBin -Filter *.dll -ErrorAction SilentlyContinue
 if (-not $ff) { throw "no FFmpeg DLLs in $FfmpegBin" }
 $ff | ForEach-Object { Copy-Item $_.FullName (Join-Path $layout $_.Name) -Force }
 
+# license/attribution payload (MSIX has no installer EULA page, so ship them as files): FFmpeg's LGPL
+# notice + license text, the project's own MIT/Apache texts, and the generated third-party notices.
+$licDir = Join-Path $layout 'licenses'
+New-Item -ItemType Directory -Force -Path $licDir | Out-Null
+$repoRoot = (Resolve-Path (Join-Path $PSScriptRoot '..\..\..')).Path
+Copy-Item (Join-Path $repoRoot 'packaging\windows\licenses\FFmpeg-LGPL-NOTICE.txt') $licDir -Force -ErrorAction SilentlyContinue
+foreach ($n in @('THIRD-PARTY-NOTICES.txt', 'LICENSE-MIT', 'LICENSE-APACHE')) {
+    $p = Join-Path $repoRoot $n
+    if (Test-Path $p) { Copy-Item $p $licDir -Force }
+}
+$ffRoot = Split-Path $FfmpegBin -Parent
+foreach ($lic in @('LICENSE.txt', 'LICENSE', 'COPYING.LGPLv2.1', 'COPYING.LGPLv3', 'COPYING.txt')) {
+    $p = Join-Path $ffRoot $lic
+    if (Test-Path $p) { Copy-Item $p $licDir -Force }
+}
+
 # tile/store assets
 Copy-Item (Join-Path $assets '*') (Join-Path $layout 'Assets') -Force
 

clients/windows/src/app.rs

@@ -20,7 +20,9 @@ use crate::video::{DecodedFrame, DecoderPref};
 use punktfunk_core::client::NativeClient;
 use punktfunk_core::config::{CompositorPref, GamepadPref, Mode};
 use std::cell::RefCell;
+use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, Mutex};
+use std::time::Duration;
 use windows_reactor::*;
 
 const RESOLUTIONS: &[(u32, u32)] = &[
@@ -43,12 +45,27 @@ const BITRATES_MBPS: &[u32] = &[0, 10, 20, 30, 50, 80, 150];
 /// capture; the resolved count drives the decoder + WASAPI render layout.
 const AUDIO_CHANNELS: &[(u8, &str)] = &[(2, "Stereo"), (6, "5.1 Surround"), (8, "7.1 Surround")];
 
+/// punktfunk's own license (MIT OR Apache-2.0), shown on the Licenses screen.
+const APP_LICENSE: &str = concat!(
+    include_str!("../../../LICENSE-MIT"),
+    "\n\n================================ Apache-2.0 ================================\n\n",
+    include_str!("../../../LICENSE-APACHE"),
+);
+/// Third-party software notices for the linked Rust crates (generated by
+/// scripts/gen-third-party-notices.sh; the MSIX also ships this under licenses/).
+const THIRD_PARTY_NOTICES: &str = include_str!("../../../THIRD-PARTY-NOTICES.txt");
+
 #[derive(Clone, PartialEq)]
 enum Screen {
     Hosts,
     Connecting,
+    /// The no-PIN "request access" wait: an identified connect is in flight, parked by the host
+    /// until the operator approves this device in its console. Cancelable.
+    RequestAccess,
     Stream,
     Settings,
+    /// Open-source / third-party license notices (reached from Settings).
+    Licenses,
     Pair,
 }
 
@@ -132,6 +149,11 @@ struct Shared {
     /// Latest stream stats, written by the session's event loop and mirrored into reactor state
     /// by the stream page's HUD poll thread to drive the overlay.
     stats: Mutex<Stats>,
+    /// Cancel flag for the in-flight "request access" connect. A FRESH flag is installed per
+    /// request: the waiting screen's Cancel button reads it back from here and sets it, and that
+    /// request's event loop (which captured the same `Arc` at spawn) then tears down silently when
+    /// the parked connect finally resolves. `None` outside a request-access flow.
+    cancel: Mutex<Option<Arc<AtomicBool>>>,
 }
 
 pub struct AppCtx {
@@ -376,8 +398,13 @@ fn root(cx: &mut RenderCx, ctx: &Arc<AppCtx>) -> Element {
             .vertical_alignment(VerticalAlignment::Center)
             .into()
         }
+        // request_access_page (like settings_page/Connecting) uses no hooks, so calling it inline
+        // is sound — it only wires a Cancel button to the shared cancel flag + navigation.
+        Screen::RequestAccess => request_access_page(ctx, &set_screen),
         // settings_page uses no hooks (it never touches `cx`), so calling it inline is sound.
         Screen::Settings => settings_page(ctx, &set_screen),
+        // licenses_page is a static text screen (no hooks), so inline is sound.
+        Screen::Licenses => licenses_page(&set_screen),
         Screen::Pair => component(pair_page, svc),
         Screen::Stream => component(stream_page, StreamProps { svc, stats }),
     }
@@ -569,12 +596,61 @@ fn initiate(
     }
 }
 
+/// Tunables that differ between the normal connect and the no-PIN "request access" flow.
+/// `Default` is the normal connect: short handshake budget, persist *unpaired* on TOFU, and the
+/// plain "Connecting" screen.
+struct ConnectOpts {
+    /// Handshake budget. Request-access uses a long one because the host PARKS the connection
+    /// until the operator clicks Approve in its console (see the host's `PENDING_APPROVAL_WAIT`).
+    connect_timeout: Duration,
+    /// Persist the host as *paired* on a successful connect. Set for request-access, where the
+    /// operator's approval IS the pairing, so future connects are silent (rule 1). Normal TOFU
+    /// persists the host *unpaired* (pinned, but not PIN/approval-verified).
+    persist_paired: bool,
+    /// Show the cancelable "waiting for approval" screen instead of "Connecting" (request-access).
+    awaiting_approval: bool,
+    /// Set by the waiting screen's Cancel button. `NativeClient::connect` is blocking with no
+    /// abort, so Cancel returns the UI immediately and leaves the parked connect to resolve/time
+    /// out; this request's event loop then sees the flag and tears down silently (drops the
+    /// connector → closes the connection) without touching a screen a new session may already own.
+    cancel: Option<Arc<AtomicBool>>,
+}
+
+impl Default for ConnectOpts {
+    fn default() -> Self {
+        Self {
+            connect_timeout: Duration::from_secs(15),
+            persist_paired: false,
+            awaiting_approval: false,
+            cancel: None,
+        }
+    }
+}
+
 fn connect(
     ctx: &Arc<AppCtx>,
     target: &Target,
     pin: Option<[u8; 32]>,
     set_screen: &AsyncSetState<Screen>,
     set_status: &AsyncSetState<String>,
+) {
+    connect_with(
+        ctx,
+        target,
+        pin,
+        set_screen,
+        set_status,
+        ConnectOpts::default(),
+    );
+}
+
+fn connect_with(
+    ctx: &Arc<AppCtx>,
+    target: &Target,
+    pin: Option<[u8; 32]>,
+    set_screen: &AsyncSetState<Screen>,
+    set_status: &AsyncSetState<String>,
+    opts: ConnectOpts,
 ) {
     let s = ctx.settings.lock().unwrap().clone();
     let mode = if s.width != 0 && s.refresh_hz != 0 {
@@ -607,29 +683,54 @@ fn connect(
         decoder: DecoderPref::from_name(&s.decoder),
         pin,
         identity: ctx.identity.clone(),
+        connect_timeout: opts.connect_timeout,
     });
     set_status.call(String::new());
-    set_screen.call(Screen::Connecting);
+    set_screen.call(if opts.awaiting_approval {
+        Screen::RequestAccess
+    } else {
+        Screen::Connecting
+    });
 
     let tofu = pin.is_none();
+    let persist_paired = opts.persist_paired;
+    let cancel = opts.cancel;
     let (shared, gamepad) = (ctx.shared.clone(), ctx.gamepad.clone());
     let (ss, st) = (set_screen.clone(), set_status.clone());
     let target = target.clone();
     std::thread::spawn(move || loop {
-        match handle.events.recv_blocking() {
+        let event = match handle.events.recv_blocking() {
-            Ok(SessionEvent::Connected {
+            Ok(e) => e,
+            Err(_) => {
+                gamepad.detach();
+                ss.call(Screen::Hosts);
+                break;
+            }
+        };
+        // A cancelled request-access connect that resolved late (the host approved or the park
+        // timed out after the user walked away): tear down silently. Cancel already returned the
+        // UI to the host list; dropping `event` (and with it any connector) closes the connection
+        // without popping a stream or a stray error over the screen a new session may own.
+        if cancel.as_ref().is_some_and(|c| c.load(Ordering::SeqCst)) {
+            break;
+        }
+        match event {
+            SessionEvent::Connected {
                 connector,
                 fingerprint,
                 ..
-            }) => {
+            } => {
-                if tofu {
+                if persist_paired || tofu {
+                    // Request-access: the operator approved this device, so record the host as a
+                    // trusted PAIRED host — future connects are then silent (rule 1), exactly like
+                    // after a PIN ceremony. A plain TOFU connect persists it *unpaired* (pinned).
                     let mut k = KnownHosts::load();
                     k.upsert(KnownHost {
                         name: target.name.clone(),
                         addr: target.addr.clone(),
                         port: target.port,
                         fp_hex: trust::hex(&fingerprint),
-                        paired: false,
+                        paired: persist_paired,
                     });
                     let _ = k.save();
                 }
@@ -638,10 +739,10 @@ fn connect(
                 *shared.handoff.lock().unwrap() = Some((connector, handle.frames.clone()));
                 ss.call(Screen::Stream);
             }
-            Ok(SessionEvent::Failed {
+            SessionEvent::Failed {
                 msg,
                 trust_rejected,
-            }) => {
+            } => {
                 st.call(msg);
                 gamepad.detach();
                 if trust_rejected {
@@ -653,22 +754,100 @@ fn connect(
                 }
                 break;
             }
-            Ok(SessionEvent::Ended(err)) => {
+            SessionEvent::Ended(err) => {
                 st.call(err.unwrap_or_else(|| "Session ended".into()));
                 gamepad.detach();
                 ss.call(Screen::Hosts);
                 break;
             }
-            Ok(SessionEvent::Stats(s)) => *shared.stats.lock().unwrap() = s,
+            SessionEvent::Stats(s) => *shared.stats.lock().unwrap() = s,
-            Err(_) => {
-                gamepad.detach();
-                ss.call(Screen::Hosts);
-                break;
-            }
         }
     });
 }
 
+/// The no-PIN "request access" flow: open an identified connect that the host PARKS until the
+/// operator approves this device in its console (or web UI), showing a cancelable "waiting"
+/// screen meanwhile. On approval the SAME connection is admitted (no reconnect) and the host is
+/// saved as paired, so later connects are silent.
+fn request_access(
+    ctx: &Arc<AppCtx>,
+    target: &Target,
+    set_screen: &AsyncSetState<Screen>,
+    set_status: &AsyncSetState<String>,
+) {
+    // Pin the advertised certificate for a discovered host (defence against a host impostor while
+    // we wait); a manually-typed host has no advertised fingerprint, so trust-on-first-use.
+    let pin = target.fp_hex.as_deref().and_then(trust::parse_hex32);
+    // A fresh cancel flag per request, installed where the waiting screen's Cancel button can read
+    // it back; this request's event loop captures the same `Arc` (via ConnectOpts) below.
+    let cancel = Arc::new(AtomicBool::new(false));
+    *ctx.shared.cancel.lock().unwrap() = Some(cancel.clone());
+    connect_with(
+        ctx,
+        target,
+        pin,
+        set_screen,
+        set_status,
+        ConnectOpts {
+            // Must exceed the host's approval window (PENDING_APPROVAL_WAIT) so a slow operator
+            // approval still lands on this connection rather than timing the client out first.
+            connect_timeout: Duration::from_secs(185),
+            persist_paired: true,
+            awaiting_approval: true,
+            cancel: Some(cancel),
+        },
+    );
+}
+
+/// The cancelable "waiting for approval" screen (request-access flow): a spinner + guidance while
+/// the identified connect sits parked on the host, plus a Cancel that returns to the host list and
+/// trips the shared cancel flag so the parked connect tears down silently if it resolves after the
+/// user has walked away. Mirrors the inline `Connecting` screen; uses no hooks.
+fn request_access_page(ctx: &Arc<AppCtx>, set_screen: &AsyncSetState<Screen>) -> Element {
+    let target_name = ctx.shared.target.lock().unwrap().name.clone();
+    let headline = if target_name.is_empty() {
+        "Waiting for approval\u{2026}".to_string()
+    } else {
+        format!("Waiting for {target_name} to approve\u{2026}")
+    };
+    let cancel_btn = {
+        let (ctx, ss) = (ctx.clone(), set_screen.clone());
+        button("Cancel")
+            .icon(SymbolGlyph::Cancel)
+            .on_click(move || {
+                // Return the UI immediately; the parked connect is blocking with no abort, so trip
+                // the flag this request's event loop captured — it then tears down silently when
+                // the connect finally resolves (see ConnectOpts::cancel).
+                if let Some(c) = ctx.shared.cancel.lock().unwrap().as_ref() {
+                    c.store(true, Ordering::SeqCst);
+                }
+                ss.call(Screen::Hosts);
+            })
+            .horizontal_alignment(HorizontalAlignment::Center)
+    };
+    vstack((
+        ProgressRing::indeterminate()
+            .width(48.0)
+            .height(48.0)
+            .horizontal_alignment(HorizontalAlignment::Center),
+        text_block(headline)
+            .font_size(18.0)
+            .semibold()
+            .horizontal_alignment(HorizontalAlignment::Center),
+        text_block(
+            "Approve this device in the host's console or web UI \u{2014} it connects automatically \
+             once you approve it. No PIN needed.",
+        )
+        .foreground(ThemeRef::SecondaryText)
+        .horizontal_alignment(HorizontalAlignment::Center),
+        cancel_btn,
+    ))
+    .spacing(16.0)
+    .horizontal_alignment(HorizontalAlignment::Center)
+    .vertical_alignment(VerticalAlignment::Center)
+    .into()
+}
+
 fn pair_page(props: &Svc, cx: &mut RenderCx) -> Element {
     let ctx = &props.ctx;
     let set_screen = &props.set_screen;
@@ -728,6 +907,20 @@ fn pair_page(props: &Svc, cx: &mut RenderCx) -> Element {
             .icon(SymbolGlyph::Cancel)
             .on_click(move || ss.call(Screen::Hosts))
     };
+    // The no-PIN alternative offered alongside the PIN ceremony: open an identified connect that
+    // the host parks until the operator approves this device in its console (delegated approval).
+    let request_btn = {
+        let (ctx2, ss, st, target2) = (
+            ctx.clone(),
+            set_screen.clone(),
+            set_status.clone(),
+            target.clone(),
+        );
+        button("Request access without a PIN")
+            .icon(SymbolGlyph::Send)
+            .on_click(move || request_access(&ctx2, &target2, &ss, &st))
+            .horizontal_alignment(HorizontalAlignment::Stretch)
+    };
 
     let content = card(vstack((
         grid((
@@ -760,6 +953,13 @@ fn pair_page(props: &Svc, cx: &mut RenderCx) -> Element {
             .font_size(28.0)
             .on_changed(move |s| set_code.call(s)),
         hstack((pair_btn, cancel_btn)).spacing(8.0),
+        text_block(
+            "Don\u{2019}t have a PIN? Request access instead and approve this device on the host \
+             (its console or web UI) \u{2014} no PIN needed.",
+        )
+        .font_size(12.0)
+        .foreground(ThemeRef::SecondaryText),
+        request_btn,
     ))
     .spacing(16.0))
     .max_width(480.0)
@@ -967,6 +1167,21 @@ fn settings_page(ctx: &Arc<AppCtx>, set_screen: &AsyncSetState<Screen>) -> Eleme
         .spacing(10.0),
     );
 
+    let licenses_button = {
+        let ss = set_screen.clone();
+        button("Third-party licenses").on_click(move || ss.call(Screen::Licenses))
+    };
+    let about_card = card(
+        vstack((
+            text_block("About").font_size(15.0).semibold(),
+            text_block("punktfunk is licensed under MIT OR Apache-2.0.")
+                .font_size(12.0)
+                .foreground(ThemeRef::SecondaryText),
+            licenses_button,
+        ))
+        .spacing(10.0),
+    );
+
     page(vec![
         header.into(),
         section("DISPLAY"),
@@ -975,6 +1190,77 @@ fn settings_page(ctx: &Arc<AppCtx>, set_screen: &AsyncSetState<Screen>) -> Eleme
         video_card.into(),
         section("AUDIO"),
         audio_card.into(),
+        section("ABOUT"),
+        about_card.into(),
+    ])
+}
+
+/// Static screen: the app's own license + the third-party software notices (reached from Settings).
+fn licenses_page(set_screen: &AsyncSetState<Screen>) -> Element {
+    let header = grid((
+        text_block("Third-party licenses")
+            .font_size(30.0)
+            .bold()
+            .grid_column(0)
+            .vertical_alignment(VerticalAlignment::Center),
+        button("Back")
+            .accent()
+            .icon(SymbolGlyph::Back)
+            .on_click({
+                let ss = set_screen.clone();
+                move || ss.call(Screen::Settings)
+            })
+            .grid_column(1)
+            .vertical_alignment(VerticalAlignment::Center),
+    ))
+    .columns([GridLength::Star(1.0), GridLength::Auto])
+    .margin(edges(0.0, 0.0, 0.0, 6.0));
+
+    let app_card = card(
+        vstack((
+            text_block("punktfunk").font_size(15.0).semibold(),
+            text_block("Licensed under MIT OR Apache-2.0, at your option.")
+                .font_size(12.0)
+                .foreground(ThemeRef::SecondaryText),
+            text_block(APP_LICENSE)
+                .font_size(11.0)
+                .foreground(ThemeRef::SecondaryText),
+        ))
+        .spacing(8.0),
+    );
+
+    let natives_card = card(
+        vstack((
+            text_block("Bundled components").font_size(15.0).semibold(),
+            text_block(
+                "FFmpeg is bundled under the LGPL v2.1+ (dynamically linked, replaceable DLLs); its \
+                 license and notice ship in the installed licenses\\ folder. SDL 3 (Zlib) and the \
+                 Windows App SDK (Microsoft) are also linked.",
+            )
+            .font_size(12.0)
+            .foreground(ThemeRef::SecondaryText),
+        ))
+        .spacing(8.0),
+    );
+
+    let notices_card = card(
+        vstack((
+            text_block("Rust crates").font_size(15.0).semibold(),
+            text_block(THIRD_PARTY_NOTICES)
+                .font_size(11.0)
+                .foreground(ThemeRef::SecondaryText),
+        ))
+        .spacing(8.0),
+    );
+
+    page(vec![
+        header.into(),
+        section("PUNKTFUNK"),
+        app_card.into(),
+        section("BUNDLED"),
+        natives_card.into(),
+        section("OPEN SOURCE"),
+        notices_card.into(),
     ])
 }
 

clients/windows/src/gamepad.rs

@@ -169,6 +169,13 @@ fn button_bit(b: sdl3::gamepad::Button) -> Option<u32> {
         Button::DPadLeft => wire::BTN_DPAD_LEFT,
         Button::DPadRight => wire::BTN_DPAD_RIGHT,
         Button::Touchpad => wire::BTN_TOUCHPAD,
+        // Back grips / paddles (Steam Deck L4/L5/R4/R5, Xbox Elite P1–P4) + the misc/Share button.
+        // PADDLE1/2/3/4 = R4/L4/R5/L5 (see the host `input::gamepad`).
+        Button::RightPaddle1 => wire::BTN_PADDLE1,
+        Button::LeftPaddle1 => wire::BTN_PADDLE2,
+        Button::RightPaddle2 => wire::BTN_PADDLE3,
+        Button::LeftPaddle2 => wire::BTN_PADDLE4,
+        Button::Misc1 => wire::BTN_MISC1,
         _ => return None,
     })
 }
@@ -240,6 +247,9 @@ struct Worker {
     /// Wire state of the active pad — zeroed on the wire at switch/detach.
     last_axis: [i32; 6],
     held_buttons: Vec<u32>,
+    /// Touchpad contacts the host believes are down, keyed by `(surface, finger)` — lifted on pad
+    /// switch / detach. surface 0 = the legacy single touchpad, 1/2 = a Steam left/right pad.
+    held_touches: std::collections::HashSet<(u8, u8)>,
     last_accel: [i16; 3],
 }
 
@@ -252,13 +262,21 @@ impl Worker {
 
     fn pad_info(&self, id: u32) -> Option<PadInfo> {
         let pad = self.opened.get(&id)?;
+        let mut pref = pref_for_type(
+            self.subsystem
+                .type_for_id(sdl3::sys::joystick::SDL_JoystickID(id)),
+        );
+        // No SDL type for the Steam Deck / Steam Controller — detect Valve by VID/PID (Deck 0x1205,
+        // SC wired 0x1102, SC dongle 0x1142) so the host builds the virtual hid-steam pad.
+        if pad.vendor_id() == Some(0x28DE)
+            && matches!(pad.product_id(), Some(0x1205 | 0x1102 | 0x1142))
+        {
+            pref = GamepadPref::SteamDeck;
+        }
         Some(PadInfo {
             id,
             name: pad.name().unwrap_or_else(|| "Controller".into()),
-            pref: pref_for_type(
+            pref,
-                self.subsystem
-                    .type_for_id(sdl3::sys::joystick::SDL_JoystickID(id)),
-            ),
         })
     }
 
@@ -274,9 +292,33 @@ impl Worker {
                 }
                 *v = i32::MIN;
             }
+            for (surface, finger) in self.held_touches.drain() {
+                let rich = if surface == 0 {
+                    RichInput::Touchpad {
+                        pad: 0,
+                        finger,
+                        active: false,
+                        x: 0,
+                        y: 0,
+                    }
+                } else {
+                    RichInput::TouchpadEx {
+                        pad: 0,
+                        surface,
+                        finger,
+                        touch: false,
+                        click: false,
+                        x: 0,
+                        y: 0,
+                        pressure: 0,
+                    }
+                };
+                let _ = c.send_rich_input(rich);
+            }
         } else {
             self.held_buttons.clear();
             self.last_axis = [i32::MIN; 6];
+            self.held_touches.clear();
         }
     }
 
@@ -292,6 +334,56 @@ impl Worker {
             }
         }
     }
+
+    /// Forward one touchpad contact on the rich-input plane. A multi-touchpad pad (Steam Deck / Steam
+    /// Controller) sends `TouchpadEx` with the surface (SDL touchpad 0 = left → 1, 1 = right → 2) and
+    /// signed coordinates; a single-touchpad pad (DualSense) keeps the legacy `Touchpad` (unsigned).
+    fn forward_touch(
+        &mut self,
+        which: u32,
+        touchpad: u32,
+        finger: u8,
+        x: f32,
+        y: f32,
+        active: bool,
+    ) {
+        let Some(c) = self.attached.as_ref() else {
+            return;
+        };
+        let multi = self
+            .opened
+            .get(&which)
+            .map(|p| p.touchpads_count() >= 2)
+            .unwrap_or(false);
+        let (cx, cy) = (x.clamp(0.0, 1.0), y.clamp(0.0, 1.0));
+        let surface = if multi { (touchpad as u8) + 1 } else { 0 };
+        let rich = if multi {
+            RichInput::TouchpadEx {
+                pad: 0,
+                surface,
+                finger,
+                touch: active,
+                click: false,
+                x: (cx * 65535.0 - 32768.0) as i16,
+                y: (cy * 65535.0 - 32768.0) as i16,
+                pressure: 0,
+            }
+        } else {
+            RichInput::Touchpad {
+                pad: 0,
+                finger,
+                active,
+                x: (cx * 65535.0) as u16,
+                y: (cy * 65535.0) as u16,
+            }
+        };
+        let _ = c.send_rich_input(rich);
+        if active {
+            self.held_touches.insert((surface, finger));
+        } else {
+            self.held_touches.remove(&(surface, finger));
+        }
+    }
 }
 
 #[allow(clippy::too_many_lines)]
@@ -305,6 +397,10 @@ fn run(
     // thread.
     sdl3::hint::set("SDL_NO_SIGNAL_HANDLERS", "1");
     sdl3::hint::set("SDL_JOYSTICK_THREAD", "1");
+    // Let SDL's HIDAPI drivers open Valve Steam Controller / Steam Deck devices directly, so the
+    // paddles, both trackpads, and gyro arrive as first-class SDL gamepad inputs.
+    sdl3::hint::set("SDL_JOYSTICK_HIDAPI_STEAMDECK", "1");
+    sdl3::hint::set("SDL_JOYSTICK_HIDAPI_STEAM", "1");
     let sdl = sdl3::init().map_err(|e| e.to_string())?;
     let subsystem = sdl.gamepad().map_err(|e| e.to_string())?;
     let mut pump = sdl.event_pump().map_err(|e| e.to_string())?;
@@ -317,6 +413,7 @@ fn run(
         attached: None,
         last_axis: [i32::MIN; 6],
         held_buttons: Vec::new(),
+        held_touches: std::collections::HashSet::new(),
         last_accel: [0; 3],
     };
 
@@ -426,9 +523,11 @@ fn run(
                         send(w.attached.as_ref().unwrap(), InputKind::GamepadAxis, id, v);
                     }
                 }
-                // DualSense touchpad → the rich-input plane, normalized 0..=65535.
+                // Touchpad contacts → the rich-input plane. One pad (DualSense) keeps the legacy
+                // `Touchpad`; two pads (Steam Deck / Steam Controller) send `TouchpadEx` per surface.
                 Event::ControllerTouchpadDown {
                     which,
+                    touchpad,
                     finger,
                     x,
                     y,
@@ -436,41 +535,23 @@ fn run(
                 }
                 | Event::ControllerTouchpadMotion {
                     which,
+                    touchpad,
                     finger,
                     x,
                     y,
                     ..
                 } if active == Some(which) && w.attached.is_some() => {
-                    let _ = w
+                    w.forward_touch(which, touchpad as u32, finger as u8, x, y, true);
-                        .attached
-                        .as_ref()
-                        .unwrap()
-                        .send_rich_input(RichInput::Touchpad {
-                            pad: 0,
-                            finger: finger as u8,
-                            active: true,
-                            x: (x.clamp(0.0, 1.0) * 65535.0) as u16,
-                            y: (y.clamp(0.0, 1.0) * 65535.0) as u16,
-                        });
                 }
                 Event::ControllerTouchpadUp {
                     which,
+                    touchpad,
                     finger,
                     x,
                     y,
                     ..
                 } if active == Some(which) && w.attached.is_some() => {
-                    let _ = w
+                    w.forward_touch(which, touchpad as u32, finger as u8, x, y, false);
-                        .attached
-                        .as_ref()
-                        .unwrap()
-                        .send_rich_input(RichInput::Touchpad {
-                            pad: 0,
-                            finger: finger as u8,
-                            active: false,
-                            x: (x.clamp(0.0, 1.0) * 65535.0) as u16,
-                            y: (y.clamp(0.0, 1.0) * 65535.0) as u16,
-                        });
                 }
                 // Motion: accel events update the cache; each gyro event ships a sample (the
                 // DualSense reports both at ~250 Hz). Scale convention shared with the other

clients/windows/src/main.rs

@@ -184,6 +184,9 @@ fn run_headless_cli(args: &[String], identity: (String, String)) {
         decoder,
         pin,
         identity,
+        // Headless CLI uses the normal (short) handshake budget; the long request-access wait is a
+        // GUI-only flow.
+        connect_timeout: Duration::from_secs(15),
     });
 
     let deadline = Instant::now() + Duration::from_secs(60);

clients/windows/src/session.rs

@@ -34,6 +34,11 @@ pub struct SessionParams {
     /// Pinned host fingerprint; `None` = trust on first use (caller persists the observed one).
     pub pin: Option<[u8; 32]>,
     pub identity: (String, String),
+    /// How long to wait for the handshake. The normal path uses a short budget; the
+    /// "request access" (delegated-approval) path uses a long one, because the host PARKS the
+    /// connection until the operator clicks Approve in its console (so this must exceed the
+    /// host's approval window — see `PENDING_APPROVAL_WAIT`).
+    pub connect_timeout: Duration,
 }
 
 #[derive(Clone, Copy, Default, PartialEq)]
@@ -164,7 +169,7 @@ fn pump(
         None, // launch: the Windows client has no library picker yet
         params.pin,
         Some(params.identity),
-        Duration::from_secs(15),
+        params.connect_timeout,
     ) {
         Ok(c) => Arc::new(c),
         Err(e) => {

crates/pf-driver-proto/src/lib.rs

@@ -80,7 +80,14 @@ pub mod control {
         pub width: u32,
         pub height: u32,
         pub refresh_hz: u32,
-        pub _reserved: u32,
+        /// Host-preferred per-client monitor id (`1..=15`) — the EDID serial / IddCx `ConnectorIndex` /
+        /// `ContainerId` the driver names this monitor by. A given client (keyed by its cert fingerprint)
+        /// gets a STABLE id across reconnects, so the OS device path + EDID stay identical and Windows
+        /// reapplies that client's saved per-monitor config (DPI scaling). `0` = AUTO: the driver
+        /// allocates the lowest-free id (the original slot-based behavior — used for anonymous/TOFU and
+        /// GameStream sessions). Byte-compatible with the old `_reserved` (offset 20): an un-upgraded
+        /// driver ignores it (→ auto), which the host detects via [`AddReply::resolved_monitor_id`].
+        pub preferred_monitor_id: u32,
     }
 
     /// `IOCTL_ADD` reply: the OS target id + the adapter LUID the IDD landed on (split low/high to
@@ -91,7 +98,11 @@ pub mod control {
         pub adapter_luid_low: u32,
         pub adapter_luid_high: i32,
         pub target_id: u32,
-        pub _reserved: u32,
+        /// The monitor id the driver ACTUALLY used — echoes [`AddRequest::preferred_monitor_id`] when the
+        /// preference was honored, or the auto-allocated id otherwise. Byte-compatible with the old
+        /// `_reserved` (offset 12): an un-upgraded driver leaves it `0`, so the host can tell its
+        /// preference was ignored (stale driver) and log it instead of silently losing per-client config.
+        pub resolved_monitor_id: u32,
     }
 
     /// `IOCTL_REMOVE` input.
@@ -129,11 +140,13 @@ pub mod control {
         assert!(offset_of!(AddRequest, width) == 8);
         assert!(offset_of!(AddRequest, height) == 12);
         assert!(offset_of!(AddRequest, refresh_hz) == 16);
+        assert!(offset_of!(AddRequest, preferred_monitor_id) == 20);
 
         assert!(size_of::<AddReply>() == 16);
         assert!(offset_of!(AddReply, adapter_luid_low) == 0);
         assert!(offset_of!(AddReply, adapter_luid_high) == 4);
         assert!(offset_of!(AddReply, target_id) == 8);
+        assert!(offset_of!(AddReply, resolved_monitor_id) == 12);
 
         assert!(size_of::<RemoveRequest>() == 8);
         assert!(offset_of!(RemoveRequest, session_id) == 0);
@@ -436,11 +449,25 @@ mod tests {
             width: 3840,
             height: 2160,
             refresh_hz: 120,
-            _reserved: 0,
+            preferred_monitor_id: 7,
         };
         let bytes = bytemuck::bytes_of(&req);
         assert_eq!(bytes.len(), 24);
         assert_eq!(*bytemuck::from_bytes::<control::AddRequest>(bytes), req);
+        // preferred_monitor_id occupies the old `_reserved` slot at offset 20 — byte-compatible.
+        assert_eq!(bytes[20..24], 7u32.to_le_bytes());
+
+        let reply = control::AddReply {
+            adapter_luid_low: 0x1234_5678,
+            adapter_luid_high: -2,
+            target_id: 262,
+            resolved_monitor_id: 7,
+        };
+        let rbytes = bytemuck::bytes_of(&reply);
+        assert_eq!(rbytes.len(), 16);
+        assert_eq!(*bytemuck::from_bytes::<control::AddReply>(rbytes), reply);
+        // resolved_monitor_id occupies the old `_reserved` slot at offset 12 — byte-compatible.
+        assert_eq!(rbytes[12..16], 7u32.to_le_bytes());
     }
 
     #[test]

crates/punktfunk-core/src/abi.rs

@@ -492,6 +492,10 @@ pub const PUNKTFUNK_HIDOUT_LED: u8 = 1;
 pub const PUNKTFUNK_HIDOUT_PLAYER_LEDS: u8 = 2;
 /// `PunktfunkHidOutput::kind` — one adaptive-trigger effect (`which` + `effect`/`effect_len` valid).
 pub const PUNKTFUNK_HIDOUT_TRIGGER: u8 = 3;
+/// `PunktfunkHidOutput::kind` — a trackpad haptic pulse (Steam Controller voice-coils). `which` =
+/// side (0 = right pad, 1 = left pad); `effect[0..6]` packs `amplitude` / `period` / `count` as
+/// little-endian `u16`s with `effect_len = 6`. Clients without trackpad coils drop it.
+pub const PUNKTFUNK_HIDOUT_TRACKPAD_HAPTIC: u8 = 4;
 /// Capacity of `PunktfunkHidOutput::effect` (the DualSense trigger parameter block).
 pub const PUNKTFUNK_HID_EFFECT_MAX: u8 = 11;
 
@@ -559,6 +563,23 @@ impl PunktfunkHidOutput {
                 out.effect[..n].copy_from_slice(&effect[..n]);
                 out.effect_len = n as u8;
             }
+            HidOutput::TrackpadHaptic {
+                pad,
+                side,
+                amplitude,
+                period,
+                count,
+            } => {
+                // No new struct (PunktfunkHidOutput has no size guard): pack into the existing
+                // `which` (side) + `effect[0..6]` (amplitude/period/count LE), `effect_len = 6`.
+                out.kind = PUNKTFUNK_HIDOUT_TRACKPAD_HAPTIC;
+                out.pad = *pad;
+                out.which = *side;
+                out.effect[0..2].copy_from_slice(&amplitude.to_le_bytes());
+                out.effect[2..4].copy_from_slice(&period.to_le_bytes());
+                out.effect[4..6].copy_from_slice(&count.to_le_bytes());
+                out.effect_len = 6;
+            }
         }
         out
     }
@@ -618,6 +639,11 @@ impl PunktfunkHdrMeta {
 pub const PUNKTFUNK_RICH_TOUCHPAD: u8 = 1;
 /// `PunktfunkRichInput::kind` — a motion sample (`gyro`/`accel` valid).
 pub const PUNKTFUNK_RICH_MOTION: u8 = 2;
+/// `RichInput::TouchpadEx` kind on the wire — an extended trackpad contact that identifies the
+/// surface (0 single / 1 Steam-left / 2 Steam-right) and carries click + pressure. The host decodes
+/// it today; *sending* it from a C client needs the size-prefixed `PunktfunkRichInputEx` +
+/// `punktfunk_connection_send_rich_input2` (added with client capture).
+pub const PUNKTFUNK_RICH_TOUCHPAD_EX: u8 = 3;
 
 /// One rich client→host input for the host's virtual DualSense
 /// ([`punktfunk_connection_send_rich_input`]): a touchpad contact or a motion sample. Set `kind`
@@ -666,6 +692,77 @@ impl PunktfunkRichInput {
     }
 }
 
+/// Forward-compatible superset of [`PunktfunkRichInput`] that can also express the rich Steam
+/// surfaces: a *second* trackpad (`surface`), a distinct `click` vs touch, signed coordinates, and
+/// pressure. Sent via [`punktfunk_connection_send_rich_input2`] — the only way a C client can emit a
+/// `TouchpadEx`. The caller MUST set `struct_size = sizeof(PunktfunkRichInputEx)` (the ABI-skew
+/// guard, like [`PunktfunkConfig`]); the legacy [`PunktfunkRichInput`] +
+/// [`punktfunk_connection_send_rich_input`] stay byte-for-byte for existing callers.
+#[cfg(feature = "quic")]
+#[repr(C)]
+#[derive(Clone, Copy)]
+pub struct PunktfunkRichInputEx {
+    /// MUST equal `sizeof(PunktfunkRichInputEx)`.
+    pub struct_size: u32,
+    /// One of `PUNKTFUNK_RICH_*` (`TOUCHPAD` / `MOTION` / `TOUCHPAD_EX`).
+    pub kind: u8,
+    /// Gamepad index.
+    pub pad: u8,
+    /// Touchpad/TouchpadEx: contact id.
+    pub finger: u8,
+    /// Touchpad/TouchpadEx: 1 = finger down / touching, 0 = lifted.
+    pub active: u8,
+    /// TouchpadEx: which surface — 0 = single/DualSense, 1 = Steam left pad, 2 = Steam right pad.
+    pub surface: u8,
+    /// TouchpadEx: 1 = the pad is physically clicked (depressed), distinct from a touch contact.
+    pub click: u8,
+    /// Reserved for alignment; set to 0.
+    pub _reserved: [u8; 2],
+    /// TouchpadEx: x coordinate — **signed**, centred at 0 (the real Steam report convention). For a
+    /// legacy `TOUCHPAD` kind sent through this struct, store the unsigned `0..=65535` value's bits.
+    pub x: i16,
+    /// TouchpadEx: y coordinate — signed, centred at 0.
+    pub y: i16,
+    /// TouchpadEx: contact pressure (`0` if the surface has no force sensor).
+    pub pressure: u16,
+    /// Motion: gyro (pitch, yaw, roll), raw signed-16.
+    pub gyro: [i16; 3],
+    /// Motion: accelerometer (x, y, z), raw signed-16.
+    pub accel: [i16; 3],
+}
+
+#[cfg(feature = "quic")]
+impl PunktfunkRichInputEx {
+    fn to_rich(self) -> Option<crate::quic::RichInput> {
+        use crate::quic::RichInput;
+        match self.kind {
+            PUNKTFUNK_RICH_TOUCHPAD_EX => Some(RichInput::TouchpadEx {
+                pad: self.pad,
+                surface: self.surface,
+                finger: self.finger,
+                touch: self.active != 0,
+                click: self.click != 0,
+                x: self.x,
+                y: self.y,
+                pressure: self.pressure,
+            }),
+            PUNKTFUNK_RICH_MOTION => Some(RichInput::Motion {
+                pad: self.pad,
+                gyro: self.gyro,
+                accel: self.accel,
+            }),
+            PUNKTFUNK_RICH_TOUCHPAD => Some(RichInput::Touchpad {
+                pad: self.pad,
+                finger: self.finger,
+                active: self.active != 0,
+                x: self.x as u16,
+                y: self.y as u16,
+            }),
+            _ => None,
+        }
+    }
+}
+
 /// Read an optional NUL-terminated UTF-8 string parameter; `Err` = invalid pointer/UTF-8.
 #[cfg(feature = "quic")]
 unsafe fn opt_cstr<'a>(p: *const std::os::raw::c_char) -> std::result::Result<Option<&'a str>, ()> {
@@ -714,6 +811,22 @@ pub const PUNKTFUNK_GAMEPAD_XBOXONE: u32 = 3;
 /// DualSense (minus adaptive triggers / player LEDs / mute). Honored only where available (Linux
 /// hosts); otherwise the host falls back to X-Box 360.
 pub const PUNKTFUNK_GAMEPAD_DUALSHOCK4: u32 = 4;
+/// UHID classic Steam Controller (Valve `28DE:1102`, kernel `hid-steam`): dual trackpads, gyro,
+/// two grip paddles. Reserved — currently folds to `XBOX360` until its backend lands.
+pub const PUNKTFUNK_GAMEPAD_STEAMCONTROLLER: u32 = 5;
+/// UHID Steam Deck controller (Valve `28DE:1205`, kernel `hid-steam`): full Deck gamepad incl. the
+/// four back grips, a right trackpad, and the IMU; re-grabbed by Steam Input with native glyphs when
+/// Steam runs on the host. Honored only where available (Linux hosts); else folds to X-Box 360.
+pub const PUNKTFUNK_GAMEPAD_STEAMDECK: u32 = 6;
+
+/// Extended `InputEvent` gamepad button bits for embedders building raw events: the four back grips
+/// (Steam L4/L5/R4/R5 ≙ Xbox-Elite P1–P4) + the misc/capture button, in Moonlight's
+/// `buttonFlags2 << 16` namespace. Mirror `input::gamepad::BTN_PADDLE1..4` / `BTN_MISC1`.
+pub const PUNKTFUNK_GAMEPAD_BTN_PADDLE1: u32 = 0x0001_0000;
+pub const PUNKTFUNK_GAMEPAD_BTN_PADDLE2: u32 = 0x0002_0000;
+pub const PUNKTFUNK_GAMEPAD_BTN_PADDLE3: u32 = 0x0004_0000;
+pub const PUNKTFUNK_GAMEPAD_BTN_PADDLE4: u32 = 0x0008_0000;
+pub const PUNKTFUNK_GAMEPAD_BTN_MISC1: u32 = 0x0020_0000;
 
 /// Connect to a `punktfunk/1` host and start a session at `width`x`height`@`refresh_hz`.
 /// Blocks up to `timeout_ms` for the handshake. Returns NULL on failure. Equivalent to
@@ -742,11 +855,28 @@ const _: () = {
 // Keep the ABI gamepad constants in lockstep with the wire enum (compile-time guard against drift).
 const _: () = {
     use crate::config::GamepadPref;
+    use crate::input::gamepad as g;
     assert!(PUNKTFUNK_GAMEPAD_AUTO == GamepadPref::Auto.to_u8() as u32);
     assert!(PUNKTFUNK_GAMEPAD_XBOX360 == GamepadPref::Xbox360.to_u8() as u32);
     assert!(PUNKTFUNK_GAMEPAD_DUALSENSE == GamepadPref::DualSense.to_u8() as u32);
     assert!(PUNKTFUNK_GAMEPAD_XBOXONE == GamepadPref::XboxOne.to_u8() as u32);
     assert!(PUNKTFUNK_GAMEPAD_DUALSHOCK4 == GamepadPref::DualShock4.to_u8() as u32);
+    assert!(PUNKTFUNK_GAMEPAD_STEAMCONTROLLER == GamepadPref::SteamController.to_u8() as u32);
+    assert!(PUNKTFUNK_GAMEPAD_STEAMDECK == GamepadPref::SteamDeck.to_u8() as u32);
+    // Extended button bits mirror the wire `input::gamepad` constants.
+    assert!(PUNKTFUNK_GAMEPAD_BTN_PADDLE1 == g::BTN_PADDLE1);
+    assert!(PUNKTFUNK_GAMEPAD_BTN_PADDLE2 == g::BTN_PADDLE2);
+    assert!(PUNKTFUNK_GAMEPAD_BTN_PADDLE3 == g::BTN_PADDLE3);
+    assert!(PUNKTFUNK_GAMEPAD_BTN_PADDLE4 == g::BTN_PADDLE4);
+    assert!(PUNKTFUNK_GAMEPAD_BTN_MISC1 == g::BTN_MISC1);
+};
+
+// The additive M3 kinds (TouchpadEx / TrackpadHaptic) must never grow the legacy ABI structs —
+// they have no `struct_size` guard, so a layout change would corrupt old-built callers' buffers.
+#[cfg(feature = "quic")]
+const _: () = {
+    assert!(core::mem::size_of::<PunktfunkRichInput>() == 20);
+    assert!(core::mem::size_of::<PunktfunkHidOutput>() == 19);
 };
 
 /// Trust: `pin_sha256` (NULL or 32 bytes) is the expected SHA-256 fingerprint of the host's
@@ -1727,6 +1857,43 @@ pub unsafe extern "C" fn punktfunk_connection_send_rich_input(
     })
 }
 
+/// Send a rich client→host input via the forward-compatible [`PunktfunkRichInputEx`] — the only way
+/// a C client can emit a `TouchpadEx` (a second trackpad / signed coords / pressure). Set
+/// `rich->struct_size = sizeof(PunktfunkRichInputEx)`; a smaller (older-layout) value is rejected.
+///
+/// # Safety
+/// `c` is a valid connection handle; `rich` is null or points to at least its declared
+/// `struct_size` bytes.
+#[cfg(feature = "quic")]
+#[no_mangle]
+pub unsafe extern "C" fn punktfunk_connection_send_rich_input2(
+    c: *mut PunktfunkConnection,
+    rich: *const PunktfunkRichInputEx,
+) -> PunktfunkStatus {
+    guard(|| {
+        let c = match unsafe { c.as_ref() } {
+            Some(c) => c,
+            None => return PunktfunkStatus::NullPointer,
+        };
+        if rich.is_null() {
+            return PunktfunkStatus::NullPointer;
+        }
+        // Read only the 4-byte size prefix first to bound the subsequent full read (the
+        // `PunktfunkConfig` ABI-skew precedent).
+        let declared = unsafe { std::ptr::addr_of!((*rich).struct_size).read_unaligned() } as usize;
+        if declared < std::mem::size_of::<PunktfunkRichInputEx>() {
+            return PunktfunkStatus::InvalidArg;
+        }
+        match unsafe { *rich }.to_rich() {
+            Some(r) => match c.inner.send_rich_input(r) {
+                Ok(()) => PunktfunkStatus::Ok,
+                Err(e) => e.status(),
+            },
+            None => PunktfunkStatus::InvalidArg,
+        }
+    })
+}
+
 /// The currently active session mode — the Welcome's, until an accepted
 /// [`punktfunk_connection_request_mode`] switches it. Safe any time after connect.
 ///

crates/punktfunk-core/src/config.rs

@@ -137,8 +137,9 @@ impl CompositorPref {
 /// host decide (its `PUNKTFUNK_GAMEPAD` env var, else X-Box 360). A concrete preference is
 /// honored only if that backend is available on the host (DualSense / DualShock 4 need Linux UHID);
 /// otherwise the host falls back and reports the real choice in `Welcome`. The wire form is a single
-/// byte (`0 = Auto`, `1 = Xbox360`, `2 = DualSense`, `3 = XboxOne`, `4 = DualShock4`), appended to
+/// byte (`0 = Auto`, `1 = Xbox360`, `2 = DualSense`, `3 = XboxOne`, `4 = DualShock4`,
-/// `Hello`/`Welcome` — older peers simply omit/ignore it (an unknown byte degrades to `Auto`).
+/// `5 = SteamController`, `6 = SteamDeck`), appended to `Hello`/`Welcome` — older peers simply
+/// omit/ignore it (an unknown byte degrades to `Auto`).
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
 pub enum GamepadPref {
     /// Let the host pick (its `PUNKTFUNK_GAMEPAD` env var, else X-Box 360).
@@ -155,10 +156,19 @@ pub enum GamepadPref {
     /// UHID DualShock 4 (kernel `hid-playstation`, ≥ 6.2) — lightbar, touchpad, motion, rumble. Like
     /// `DualSense` minus adaptive triggers / player LEDs / mute. Needs Linux UHID on the host.
     DualShock4,
+    /// UHID classic Steam Controller (Valve `28DE:1102`, kernel `hid-steam`) — dual trackpads, gyro,
+    /// two grip paddles, trackpad-only haptics. Needs Linux UHID. *(Reserved; its backend is not yet
+    /// built — currently folds to `Xbox360`; the Deck identity below is the implemented one.)*
+    SteamController,
+    /// UHID Steam Deck controller (Valve `28DE:1205`, kernel `hid-steam`) — full Deck gamepad incl.
+    /// the four back grips (L4/L5/R4/R5), a right trackpad, and the IMU; re-grabbed by Steam Input
+    /// with native glyphs when Steam runs on the host. Needs Linux UHID.
+    SteamDeck,
 }
 
 impl GamepadPref {
-    /// Wire byte. `0 = Auto`, `1 = Xbox360`, `2 = DualSense`, `3 = XboxOne`, `4 = DualShock4`.
+    /// Wire byte. `0 = Auto`, `1 = Xbox360`, `2 = DualSense`, `3 = XboxOne`, `4 = DualShock4`,
+    /// `5 = SteamController`, `6 = SteamDeck`.
     pub const fn to_u8(self) -> u8 {
         match self {
             GamepadPref::Auto => 0,
@@ -166,6 +176,8 @@ impl GamepadPref {
             GamepadPref::DualSense => 2,
             GamepadPref::XboxOne => 3,
             GamepadPref::DualShock4 => 4,
+            GamepadPref::SteamController => 5,
+            GamepadPref::SteamDeck => 6,
         }
     }
 
@@ -177,6 +189,8 @@ impl GamepadPref {
             2 => GamepadPref::DualSense,
             3 => GamepadPref::XboxOne,
             4 => GamepadPref::DualShock4,
+            5 => GamepadPref::SteamController,
+            6 => GamepadPref::SteamDeck,
             _ => GamepadPref::Auto,
         }
     }
@@ -192,12 +206,14 @@ impl GamepadPref {
                 GamepadPref::XboxOne
             }
             "dualshock4" | "dualshock" | "ds4" | "ps4" => GamepadPref::DualShock4,
+            "steamdeck" | "steam-deck" | "deck" => GamepadPref::SteamDeck,
+            "steamcontroller" | "steam-controller" | "steamcon" => GamepadPref::SteamController,
             _ => return None,
         })
     }
 
     /// Canonical lowercase identifier (`"auto"`, `"xbox360"`, `"dualsense"`, `"xboxone"`,
-    /// `"dualshock4"`).
+    /// `"dualshock4"`, `"steamcontroller"`, `"steamdeck"`).
     pub fn as_str(self) -> &'static str {
         match self {
             GamepadPref::Auto => "auto",
@@ -205,6 +221,8 @@ impl GamepadPref {
             GamepadPref::DualSense => "dualsense",
             GamepadPref::XboxOne => "xboxone",
             GamepadPref::DualShock4 => "dualshock4",
+            GamepadPref::SteamController => "steamcontroller",
+            GamepadPref::SteamDeck => "steamdeck",
         }
     }
 }
@@ -381,4 +399,27 @@ mod tests {
         c.fec.fec_percent = 15; // 250 + ceil(250*15/100)=288 > 255
         assert!(c.validate().is_err());
     }
+
+    #[test]
+    fn gamepad_pref_steam_roundtrip() {
+        use GamepadPref::*;
+        // Wire-byte round-trip for the Steam additions; an unknown byte still degrades to Auto.
+        for (p, b) in [(SteamController, 5u8), (SteamDeck, 6)] {
+            assert_eq!(p.to_u8(), b);
+            assert_eq!(GamepadPref::from_u8(b), p);
+        }
+        assert_eq!(GamepadPref::from_u8(99), Auto);
+        // Name parsing + canonical-name round-trip.
+        assert_eq!(GamepadPref::from_name("steamdeck"), Some(SteamDeck));
+        assert_eq!(GamepadPref::from_name("deck"), Some(SteamDeck));
+        assert_eq!(
+            GamepadPref::from_name("steamcontroller"),
+            Some(SteamController)
+        );
+        assert_eq!(SteamDeck.as_str(), "steamdeck");
+        assert_eq!(
+            GamepadPref::from_name(SteamController.as_str()),
+            Some(SteamController)
+        );
+    }
 }

crates/punktfunk-core/src/input.rs

@@ -66,10 +66,24 @@ pub mod gamepad {
     pub const BTN_B: u32 = 0x2000;
     pub const BTN_X: u32 = 0x4000;
     pub const BTN_Y: u32 = 0x8000;
+    // Extended buttons in Moonlight's `buttonFlags2 << 16` namespace (see `gamestream/gamepad.rs`),
+    // so the GameStream paddle path and the native path share one host injector map. The four Steam
+    // Deck back grips (L4/L5/R4/R5) reuse the four GameStream/Xbox-Elite paddle slots — a semantic
+    // 1:1 for binding (the device identity carries the glyph distinction).
+    /// Back grip R4 — SDL `RightPaddle1` / GameStream `PADDLE1`.
+    pub const BTN_PADDLE1: u32 = 0x0001_0000;
+    /// Back grip L4 — SDL `LeftPaddle1` / GameStream `PADDLE2`.
+    pub const BTN_PADDLE2: u32 = 0x0002_0000;
+    /// Back grip R5 — SDL `RightPaddle2` / GameStream `PADDLE3`.
+    pub const BTN_PADDLE3: u32 = 0x0004_0000;
+    /// Back grip L5 — SDL `LeftPaddle2` / GameStream `PADDLE4`.
+    pub const BTN_PADDLE4: u32 = 0x0008_0000;
     /// DualSense touchpad click. Moonlight's extended-button position (`buttonFlags2`
     /// merges in at `<< 16`, see `gamestream/gamepad.rs`), so GameStream clients land on
     /// the same bit. Only the DualSense backend renders it; the xpad has no such button.
     pub const BTN_TOUCHPAD: u32 = 0x10_0000;
+    /// Misc / capture button — the Deck `…`/quick-access, Share/Capture / GameStream `MISC`.
+    pub const BTN_MISC1: u32 = 0x0020_0000;
 
     /// Axis ids for `InputKind::GamepadAxis`.
     pub const AXIS_LS_X: u32 = 0;

crates/punktfunk-core/src/quic.rs

@@ -1218,6 +1218,7 @@ pub fn decode_mic_datagram(b: &[u8]) -> Option<(u32, u64, &[u8])> {
 
 const RICH_TOUCHPAD: u8 = 0x01;
 const RICH_MOTION: u8 = 0x02;
+const RICH_TOUCHPAD_EX: u8 = 0x03;
 
 /// A rich client→host controller input beyond the fixed [`InputEvent`](crate::input::InputEvent):
 /// the DualSense touchpad and motion sensors. `pad` is the gamepad index. Wire form is
@@ -1241,6 +1242,22 @@ pub enum RichInput {
         gyro: [i16; 3],
         accel: [i16; 3],
     },
+    /// A richer trackpad contact that also identifies *which* physical pad (Steam Controller / Deck
+    /// have two), carries a separate click vs touch state, and a pressure reading. `surface`:
+    /// `0` = the single / DualSense touchpad, `1` = the Steam left pad, `2` = the Steam right pad.
+    /// Coordinates are **signed** (centred at 0), matching the real Steam report; `pressure` is `0`
+    /// for a surface with no force sensor. New clients send this for every touch surface; the host
+    /// decodes both `Touchpad` (`0x01`) and `TouchpadEx` (`0x03`) indefinitely.
+    TouchpadEx {
+        pad: u8,
+        surface: u8,
+        finger: u8,
+        touch: bool,
+        click: bool,
+        x: i16,
+        y: i16,
+        pressure: u16,
+    },
 }
 
 impl RichInput {
@@ -1264,6 +1281,22 @@ impl RichInput {
                     out.extend_from_slice(&v.to_le_bytes());
                 }
             }
+            RichInput::TouchpadEx {
+                pad,
+                surface,
+                finger,
+                touch,
+                click,
+                x,
+                y,
+                pressure,
+            } => {
+                let state = (touch as u8) | ((click as u8) << 1);
+                out.extend_from_slice(&[RICH_TOUCHPAD_EX, pad, surface, finger, state]);
+                out.extend_from_slice(&x.to_le_bytes());
+                out.extend_from_slice(&y.to_le_bytes());
+                out.extend_from_slice(&pressure.to_le_bytes());
+            }
         }
         out
     }
@@ -1288,6 +1321,16 @@ impl RichInput {
                     accel: [i16at(9), i16at(11), i16at(13)],
                 })
             }
+            RICH_TOUCHPAD_EX if b.len() >= 12 => Some(RichInput::TouchpadEx {
+                pad: b[2],
+                surface: b[3],
+                finger: b[4],
+                touch: b[5] & 0x01 != 0,
+                click: b[5] & 0x02 != 0,
+                x: i16::from_le_bytes([b[6], b[7]]),
+                y: i16::from_le_bytes([b[8], b[9]]),
+                pressure: u16::from_le_bytes([b[10], b[11]]),
+            }),
             _ => None,
         }
     }
@@ -1296,6 +1339,7 @@ impl RichInput {
 const HIDOUT_LED: u8 = 0x01;
 const HIDOUT_PLAYER_LEDS: u8 = 0x02;
 const HIDOUT_TRIGGER: u8 = 0x03;
+const HIDOUT_TRACKPAD_HAPTIC: u8 = 0x04;
 
 /// DualSense feedback flowing host → client (what a game wrote to the host's virtual pad).
 /// Wire form `[0xCD][kind][pad][fields…]`. The rich analog of the fixed rumble datagram;
@@ -1309,6 +1353,16 @@ pub enum HidOutput {
     /// One adaptive-trigger effect: `which` 0 = L2, 1 = R2; `effect` is the raw DualSense
     /// trigger parameter block (mode + params) for the client to replay on a real controller.
     Trigger { pad: u8, which: u8, effect: Vec<u8> },
+    /// A trackpad haptic pulse for a Steam Controller's voice-coil actuators (its only "rumble").
+    /// `side` 0 = right pad, 1 = left pad; `amplitude` + `period` (µs off-time) + `count` (pulses)
+    /// synthesize a buzz. A client without trackpad coils drops it (or maps it to ordinary rumble).
+    TrackpadHaptic {
+        pad: u8,
+        side: u8,
+        amplitude: u16,
+        period: u16,
+        count: u16,
+    },
 }
 
 impl HidOutput {
@@ -1325,6 +1379,18 @@ impl HidOutput {
                 out.extend_from_slice(&[HIDOUT_TRIGGER, *pad, *which]);
                 out.extend_from_slice(effect);
             }
+            HidOutput::TrackpadHaptic {
+                pad,
+                side,
+                amplitude,
+                period,
+                count,
+            } => {
+                out.extend_from_slice(&[HIDOUT_TRACKPAD_HAPTIC, *pad, *side]);
+                out.extend_from_slice(&amplitude.to_le_bytes());
+                out.extend_from_slice(&period.to_le_bytes());
+                out.extend_from_slice(&count.to_le_bytes());
+            }
         }
         out
     }
@@ -1349,6 +1415,13 @@ impl HidOutput {
                 which: b[3],
                 effect: b[4..].to_vec(),
             }),
+            HIDOUT_TRACKPAD_HAPTIC if b.len() >= 10 => Some(HidOutput::TrackpadHaptic {
+                pad: b[2],
+                side: b[3],
+                amplitude: u16::from_le_bytes([b[4], b[5]]),
+                period: u16::from_le_bytes([b[6], b[7]]),
+                count: u16::from_le_bytes([b[8], b[9]]),
+            }),
             _ => None,
         }
     }
@@ -2486,6 +2559,16 @@ mod tests {
                 gyro: [-100, 200, -300],
                 accel: [16384, -8192, 1],
             },
+            RichInput::TouchpadEx {
+                pad: 2,
+                surface: 1,
+                finger: 1,
+                touch: true,
+                click: false,
+                x: -12345,
+                y: 30000,
+                pressure: 4000,
+            },
         ] {
             let d = ev.encode();
             assert_eq!(d[0], RICH_INPUT_MAGIC);
@@ -2494,7 +2577,8 @@ mod tests {
         // Disjoint from the fixed input datagram (0xC8); unknown kind + truncation → None.
         assert!(RichInput::decode(&[crate::input::INPUT_MAGIC; 18]).is_none());
         assert!(RichInput::decode(&[RICH_INPUT_MAGIC, 0x7F]).is_none()); // unknown kind
-        assert!(RichInput::decode(&[RICH_INPUT_MAGIC, RICH_TOUCHPAD, 0]).is_none());
+        assert!(RichInput::decode(&[RICH_INPUT_MAGIC, RICH_TOUCHPAD, 0]).is_none()); // short
+        assert!(RichInput::decode(&[RICH_INPUT_MAGIC, RICH_TOUCHPAD_EX, 0, 0, 0, 0]).is_none());
         // short
     }
 
@@ -2516,6 +2600,13 @@ mod tests {
                 which: 1,
                 effect: vec![0x26, 0x90, 0xA0, 0xFF, 0x00, 0x00],
             },
+            HidOutput::TrackpadHaptic {
+                pad: 0,
+                side: 1,
+                amplitude: 0x1234,
+                period: 0x5678,
+                count: 9,
+            },
         ];
         for ev in &cases {
             let d = ev.encode();

crates/punktfunk-host/Cargo.toml

@@ -35,9 +35,11 @@ base64 = "0.22"
 ureq = "2"
 rcgen = { version = "0.13", default-features = false, features = ["aws_lc_rs", "pem"] }
 x509-parser = "0.16"
-axum-server = { version = "0.7", features = ["tls-rustls"] }
+# Only used for the plain-HTTP nvhttp listener (`bind().serve()`); HTTPS/mTLS is hand-rolled over
+# tokio-rustls (axum-server can't surface the peer cert), so we do NOT enable `tls-rustls` — that
+# feature is what pulled the unmaintained `rustls-pemfile` (security-review dep hygiene).
+axum-server = "0.8"
 rustls = "0.23"
-rustls-pemfile = "2"
 # Manual HTTPS+mTLS serve loop for the mgmt API (axum-server can't surface the peer cert): a
 # tokio-rustls handshake exposes the client cert, then hyper serves the axum Router with the
 # verified fingerprint injected as a request extension. Versions match the workspace lock.
@@ -87,6 +89,9 @@ tokio = { version = "1", features = ["rt", "rt-multi-thread", "net", "time"] }
 wayland-client = "0.31"
 wayland-protocols-wlr = { version = "0.3", features = ["client"] }
 wayland-protocols-misc = { version = "0.3", features = ["client"] }
+# `xdg-output` (zxdg_output_v1): the per-output *logical* geometry (post-scale size + global
+# position), used by the KWin fake_input backend to map absolute coordinates under display scaling.
+wayland-protocols = { version = "0.32", features = ["client"] }
 # Codegen for KDE's `zkde_screencast_unstable_v1` (vendored in `protocols/`): create a KWin
 # virtual output sized to the client's resolution and get its PipeWire node (KRdp's path).
 # `wayland-backend` is referenced by the generated interface tables.
@@ -117,6 +122,10 @@ ash = "0.38"
 # `libcuda.so.1` is dlopen'd at runtime (NOT link-time) so one Linux binary runs on NVIDIA
 # (zero-copy via CUDA) AND on AMD/Intel (VAAPI, no NVIDIA driver present) — see `zerocopy::cuda`.
 libloading = "0.8"
+# Vendored + trimmed `usbip` server core (no libusb) — presents a virtual Steam Deck over USB/IP
+# so the local `vhci_hcd` attaches it: the shippable, Secure-Boot-clean, Steam-Input-promotable
+# virtual-Deck transport on non-SteamOS hosts (`inject/linux/steam_usbip.rs`). See the crate's NOTICE.
+usbip-sim = { path = "vendor/usbip-sim" }
 
 [target.'cfg(target_os = "windows")'.dependencies]
 # Windows host backends. `windows` covers the Win32/CCD APIs the SudoVDA virtual-display backend
@@ -173,6 +182,9 @@ windows = { version = "0.62", features = [
     # Windows service supervisor (src/service.rs): a kill-on-close job object so a service crash never
     # orphans the SYSTEM host it launched into the interactive session.
     "Win32_System_JobObjects",
+    # CoCreateInstance(PolicyConfigClient) — set the default audio playback/recording endpoints via the
+    # undocumented IPolicyConfig (audio/windows/audio_control.rs) so mic + desktop audio auto-wire.
+    "Win32_System_Com",
 ] }
 # The SCM plumbing for the `service` subcommand (define_windows_service! / dispatcher / control
 # handler / ServiceManager install). Wraps the Win32 service API; the supervision loop itself uses
@@ -217,6 +229,7 @@ bytemuck = { version = "1.19", features = ["derive"] }
 # nvEncodeAPI64.dll) on the linker path. Build the GPU host with `--features nvenc`.
 nvenc = ["dep:nvidia-video-codec-sdk"]
 # AMD/Intel hardware encode on Windows (AMF/QSV via ffmpeg-next). OFF by default: it needs a
-# `FFMPEG_DIR` (BtbN gpl-shared, includes `*_amf`/`*_qsv`) at build time and bundles the FFmpeg
+# `FFMPEG_DIR` (BtbN lgpl-shared — includes `*_amf`/`*_qsv`; the GPL-only x264/x265 are never used,
-# DLLs at runtime. Build the all-vendor GPU host with `--features nvenc,amf-qsv`.
+# so the LGPL build suffices and keeps the bundled DLLs LGPL, not GPL) at build time and bundles the
+# FFmpeg DLLs at runtime. Build the all-vendor GPU host with `--features nvenc,amf-qsv`.
 amf-qsv = ["dep:ffmpeg-next"]

crates/punktfunk-host/src/audio.rs

@@ -42,6 +42,7 @@ pub fn open_audio_capture(channels: u32) -> Result<Box<dyn AudioCapturer>> {
 
 #[cfg(target_os = "windows")]
 pub fn open_audio_capture(channels: u32) -> Result<Box<dyn AudioCapturer>> {
+    audio_control::ensure_wired_once();
     wasapi_cap::WasapiLoopbackCapturer::open(channels)
         .map(|c| Box::new(c) as Box<dyn AudioCapturer>)
 }
@@ -77,6 +78,7 @@ pub fn open_virtual_mic(channels: u32) -> Result<Box<dyn VirtualMic>> {
 
 #[cfg(target_os = "windows")]
 pub fn open_virtual_mic(channels: u32) -> Result<Box<dyn VirtualMic>> {
+    audio_control::ensure_wired_once();
     wasapi_mic::WasapiVirtualMic::open(channels).map(|m| Box::new(m) as Box<dyn VirtualMic>)
 }
 
@@ -85,6 +87,9 @@ pub fn open_virtual_mic(_channels: u32) -> Result<Box<dyn VirtualMic>> {
     anyhow::bail!("virtual mic requires Linux + PipeWire or Windows + a virtual audio device")
 }
 
+#[cfg(target_os = "windows")]
+#[path = "audio/windows/audio_control.rs"]
+mod audio_control;
 #[cfg(target_os = "linux")]
 mod linux;
 #[cfg(target_os = "windows")]

crates/punktfunk-host/src/audio/windows/audio_control.rs

@@ -0,0 +1,227 @@
+//! Windows audio device auto-wiring — production mic + desktop-audio passthrough with zero manual
+//! setup.
+//!
+//! A headless host has no real audio output, so BOTH the desktop-audio loopback ([`super::wasapi_cap`])
+//! and the virtual mic ([`super::wasapi_mic`]) must run on VIRTUAL audio cables — and on DIFFERENT
+//! ones, or the loopback re-captures the injected mic (an infinite echo). The installer bundles
+//! VB-Audio Virtual Cable (the mic target: its "CABLE Input" render endpoint → "CABLE Output" capture)
+//! and the host auto-installs the Steam Streaming pair (a loopback-capable render). This module wires
+//! them up at startup so no manual Sound-settings fiddling is ever needed:
+//!
+//! * default **PLAYBACK**  → a loopback-capable render that is NOT the mic cable (a real output device
+//!   if one exists, else the Steam Streaming Microphone; **never** the Steam Streaming Speakers, whose
+//!   loopback is silent — validated live). This is the endpoint [`super::wasapi_cap`] loopback-captures
+//!   for desktop audio.
+//! * default **RECORDING** → the virtual mic's capture endpoint (VB-Cable "CABLE Output") so host apps
+//!   record the client's mic by default.
+//!
+//! [`super::wasapi_mic::find_device`] then resolves the mic INJECT target to "CABLE Input" — a render
+//! candidate that is NOT the default playback — guaranteeing loopback ≠ mic, so there is no echo.
+//!
+//! Setting a default endpoint uses the undocumented `IPolicyConfig` COM interface (the only way to set
+//! a default device programmatically — neither the `windows` nor `wasapi` crate exposes it; it is the
+//! same call `mmsys.cpl` makes). Opt out with `PUNKTFUNK_KEEP_DEFAULT` to leave the user's chosen
+//! defaults untouched.
+
+// Every `unsafe` block in this file carries a `// SAFETY:` proof; enforce it.
+#![deny(clippy::undocumented_unsafe_blocks)]
+
+use anyhow::{anyhow, bail, Result};
+use std::ffi::c_void;
+use std::sync::Once;
+use wasapi::Direction;
+
+/// Run the audio device auto-wiring exactly once per process, before the first capturer/mic opens.
+/// Blocks until done so the default playback is set before the loopback captures it. Best-effort:
+/// every failure is logged, never fatal (the host then falls back to whatever the current defaults
+/// are — exactly the pre-wiring behaviour).
+pub(crate) fn ensure_wired_once() {
+    static WIRED: Once = Once::new();
+    WIRED.call_once(|| {
+        if std::env::var_os("PUNKTFUNK_KEEP_DEFAULT").is_some() {
+            tracing::info!("PUNKTFUNK_KEEP_DEFAULT set — leaving the audio default devices untouched");
+            return;
+        }
+        // Run on a dedicated COM-MTA thread so we never collide with the caller's apartment mode
+        // (the capture/mic threads each initialize their own COM separately).
+        let handle = std::thread::Builder::new()
+            .name("pf-audio-wiring".into())
+            .spawn(|| {
+                if wasapi::initialize_mta().ok().is_err() {
+                    tracing::warn!("audio wiring: COM init (MTA) failed — skipping");
+                    return;
+                }
+                if let Err(e) = ensure_audio_wiring() {
+                    tracing::warn!(error = %format!("{e:#}"),
+                        "audio auto-wiring failed — mic/desktop audio may need manual device defaults");
+                }
+            });
+        if let Ok(h) = handle {
+            let _ = h.join();
+        }
+    });
+}
+
+/// `(friendly_name, endpoint_id)` for every ACTIVE endpoint in direction `dir`.
+fn list_endpoints(dir: Direction) -> Vec<(String, String)> {
+    let mut out = Vec::new();
+    let Ok(en) = wasapi::DeviceEnumerator::new() else {
+        return out;
+    };
+    let Ok(coll) = en.get_device_collection(&dir) else {
+        return out;
+    };
+    let Ok(n) = coll.get_nbr_devices() else {
+        return out;
+    };
+    for i in 0..n {
+        if let Ok(dev) = coll.get_device_at_index(i) {
+            let id = dev.get_id().unwrap_or_default();
+            if id.is_empty() {
+                continue;
+            }
+            out.push((dev.get_friendlyname().unwrap_or_default(), id));
+        }
+    }
+    out
+}
+
+/// Pick the loopback + mic-capture devices and set them as the default playback/recording.
+fn ensure_audio_wiring() -> Result<()> {
+    let renders = list_endpoints(Direction::Render);
+    let captures = list_endpoints(Direction::Capture);
+    if renders.is_empty() {
+        bail!("no active render endpoints to wire");
+    }
+
+    // A render is unusable as the desktop-audio loopback if it is a VB-Cable endpoint (reserved for
+    // the mic inject) or the Steam Streaming Speakers (its loopback is silent — validated live).
+    let excluded_loopback =
+        |ln: &str| ln.contains("cable") || ln.contains("steam streaming speakers");
+    // "virtual-ish" = a known virtual cable; a render WITHOUT these markers is a real output device,
+    // the best loopback source (apps render there and the operator can also hear it).
+    let virtualish = |ln: &str| {
+        ln.contains("virtual")
+            || ln.contains("cable")
+            || ln.contains("steam streaming")
+            || ln.contains("voicemeeter")
+    };
+    let loopback = renders
+        .iter()
+        .find(|(n, _)| {
+            let ln = n.to_lowercase();
+            !excluded_loopback(&ln) && !virtualish(&ln)
+        })
+        .or_else(|| {
+            renders
+                .iter()
+                .find(|(n, _)| n.to_lowercase().contains("steam streaming microphone"))
+        })
+        .or_else(|| {
+            renders
+                .iter()
+                .find(|(n, _)| !excluded_loopback(&n.to_lowercase()))
+        });
+
+    // The virtual mic's CAPTURE endpoint host apps record from — VB-Cable "CABLE Output" preferred.
+    let mic_capture = captures
+        .iter()
+        .find(|(n, _)| n.to_lowercase().contains("cable output"))
+        .or_else(|| {
+            captures
+                .iter()
+                .find(|(n, _)| n.to_lowercase().contains("steam streaming microphone"))
+        })
+        .or_else(|| {
+            captures.iter().find(|(n, _)| {
+                let ln = n.to_lowercase();
+                ln.contains("voicemeeter") || ln.contains("virtual")
+            })
+        });
+
+    match loopback {
+        Some((name, id)) => match set_default_endpoint(id) {
+            Ok(()) => tracing::info!(device = %name,
+                "audio wiring: default playback = desktop-audio loopback source"),
+            Err(e) => tracing::warn!(device = %name, error = %format!("{e:#}"),
+                "audio wiring: failed to set the default playback device"),
+        },
+        None => {
+            tracing::warn!("audio wiring: no usable desktop-audio loopback render endpoint found")
+        }
+    }
+    if let Some((name, id)) = mic_capture {
+        match set_default_endpoint(id) {
+            Ok(()) => tracing::info!(device = %name,
+                "audio wiring: default recording = virtual mic (apps record the client's mic)"),
+            Err(e) => tracing::warn!(device = %name, error = %format!("{e:#}"),
+                "audio wiring: failed to set the default recording device"),
+        }
+    }
+    Ok(())
+}
+
+// --- IPolicyConfig (undocumented): set a default audio endpoint by id, for all three roles. ---
+
+/// The `IPolicyConfig` vtable. Only `SetDefaultEndpoint` is called; the 10 methods between `Release`
+/// and it (`GetMixFormat` … `SetPropertyValue`) are placeholders so the slot offset is correct.
+#[repr(C)]
+struct IPolicyConfigVtbl {
+    query_interface: unsafe extern "system" fn(
+        *mut c_void,
+        *const windows::core::GUID,
+        *mut *mut c_void,
+    ) -> windows::core::HRESULT,
+    add_ref: unsafe extern "system" fn(*mut c_void) -> u32,
+    release: unsafe extern "system" fn(*mut c_void) -> u32,
+    _reserved: [*const c_void; 10],
+    set_default_endpoint: unsafe extern "system" fn(
+        *mut c_void,
+        windows::core::PCWSTR,
+        u32,
+    ) -> windows::core::HRESULT,
+    // SetEndpointVisibility follows — unused.
+}
+
+/// Set `device_id` as the default audio endpoint for eConsole/eMultimedia/eCommunications via the
+/// undocumented `IPolicyConfig::SetDefaultEndpoint` (the call `mmsys.cpl` makes). Errs if any role
+/// fails.
+fn set_default_endpoint(device_id: &str) -> Result<()> {
+    use windows::core::{IUnknown, Interface, GUID, PCWSTR};
+    use windows::Win32::System::Com::{CoCreateInstance, CLSCTX_ALL};
+
+    // PolicyConfigClient coclass + IPolicyConfig (Win7+) IID.
+    const CLSID_POLICY_CONFIG: GUID = GUID::from_u128(0x870af99c_171d_4f9e_af0d_e63df40c2bc9);
+    const IID_IPOLICY_CONFIG: GUID = GUID::from_u128(0xf8679f50_850a_41cf_9c72_430f290290c8);
+
+    let wide: Vec<u16> = device_id.encode_utf16().chain(std::iter::once(0)).collect();
+
+    // SAFETY: CoCreateInstance with a valid CLSID returns an owned, refcounted IUnknown. We QI it for
+    // IPolicyConfig; on success (HRESULT ok + non-null pointer) we invoke its SetDefaultEndpoint slot
+    // through the documented vtable layout (3 IUnknown + 10 placeholder methods precede it) with a
+    // NUL-terminated UTF-16 id and an in-range ERole (0..=2), then Release the QI'd pointer. Every
+    // pointer is checked non-null before deref; `unk` is Released by its Drop on scope exit.
+    unsafe {
+        let unk: IUnknown = CoCreateInstance(&CLSID_POLICY_CONFIG, None, CLSCTX_ALL)
+            .map_err(|e| anyhow!("CoCreateInstance(PolicyConfig): {e}"))?;
+        let mut raw: *mut c_void = std::ptr::null_mut();
+        unk.query(&IID_IPOLICY_CONFIG, &mut raw)
+            .ok()
+            .map_err(|e| anyhow!("QueryInterface(IPolicyConfig): {e}"))?;
+        if raw.is_null() {
+            bail!("IPolicyConfig QueryInterface returned null");
+        }
+        let vtbl = *(raw as *const *const IPolicyConfigVtbl);
+        let mut result = Ok(());
+        for role in 0u32..=2 {
+            let hr = ((*vtbl).set_default_endpoint)(raw, PCWSTR(wide.as_ptr()), role);
+            if hr.is_err() {
+                result = hr
+                    .ok()
+                    .map_err(|e| anyhow!("SetDefaultEndpoint(role {role}): {e}"));
+            }
+        }
+        ((*vtbl).release)(raw);
+        result
+    }
+}

crates/punktfunk-host/src/audio/windows/wasapi_mic.rs

@@ -4,10 +4,12 @@
 //! **capture** endpoint then surfaces as a microphone that host apps can record from.
 //!
 //! Target device, by friendly-name substring (first match wins; override with `PUNKTFUNK_MIC_DEVICE`):
-//! "Steam Streaming Microphone" (ships with Steam Remote Play — exactly this purpose), VB-Audio
+//! VB-Audio "CABLE Input" (bundled by the installer — the preferred, dedicated mic target), the
-//! "CABLE Input", VoiceMeeter, or anything with "virtual" in the name. If none is present we
+//! "Steam Streaming Microphone", VoiceMeeter, or anything with "virtual" in the name.
-//! auto-install the Steam Streaming audio pair (see [`install_steam_audio_pair`]); failing that we
+//! [`super::audio_control`] sets the default playback to a DIFFERENT loopback-capable device so the
-//! return an error with install guidance and the host runs without mic passthrough.
+//! chosen mic is never the endpoint the loopback captures. If no candidate is present we auto-install
+//! the Steam Streaming audio pair (see [`install_steam_audio_pair`]); failing that we return an error
+//! with install guidance and the host runs without mic passthrough.
 //!
 //! **Anti-echo guard (the whole point of this being non-trivial).** The desktop-audio plane
 //! ([`super::wasapi_cap`]) loopback-captures the **default render endpoint**. WASAPI loopback
@@ -45,8 +47,8 @@ const MAX_QUEUE_BYTES: usize = (SAMPLE_RATE as usize * 80 / 1000) * BLOCK_ALIGN;
 /// Render-endpoint friendly-name substrings (lowercased) we can write into so the device's capture
 /// endpoint becomes a host mic. Ordered by preference.
 const CANDIDATES: &[&str] = &[
+    "cable input", // VB-Audio Virtual Cable — bundled by the installer; the preferred dedicated mic target
     "steam streaming microphone",
-    "cable input",
     "voicemeeter input",
     "voicemeeter aux input",
     "virtual",

crates/punktfunk-host/src/capture.rs

@@ -59,7 +59,7 @@ pub struct OutputFormat {
     /// Produce GPU-resident D3D11 frames (zero-copy for a GPU encoder — NVENC/AMF/QSV) rather than CPU
     /// staging. `false` **only** for the GPU-less software encoder.
     pub gpu: bool,
-    /// HDR: the capturer converts to 10-bit (IDD-push FP16 → `Rgb10a2`; the DDA secure-desktop HDR hint).
+    /// HDR: the capturer converts to 10-bit (IDD-push FP16 → `P010`, or `Rgb10a2` for a 4:4:4 source).
     /// `false` = 8-bit SDR.
     pub hdr: bool,
     /// Full-chroma 4:4:4 session: the capturer must keep full chroma — deliver packed **RGB**
@@ -380,23 +380,12 @@ pub fn capture_virtual_output(
         .map(|c| Box::new(c) as Box<dyn Capturer>)
 }
 
-/// `PUNKTFUNK_NO_WGC=1` forces the pure single-process DDA (Desktop Duplication) path everywhere: it
-/// skips WGC in [`capture_virtual_output`] AND bypasses the two-process secure-desktop relay (so even a
-/// SYSTEM host captures in-process via DDA, the way Apollo does — one capturer for the normal AND the
-/// secure desktop). For bringing DDA up to parity / validating it on its own; all the WGC code stays
-/// compiled and comes back the moment the flag is unset.
-#[cfg(target_os = "windows")]
-pub(crate) fn wgc_disabled() -> bool {
-    crate::config::config().no_wgc
-}
-
 #[cfg(target_os = "windows")]
 pub fn capture_virtual_output(
     vout: crate::vdisplay::VirtualOutput,
     want: OutputFormat,
-    capture: crate::session_plan::CaptureBackend,
+    _capture: crate::session_plan::CaptureBackend,
 ) -> Result<Box<dyn Capturer>> {
-    use crate::session_plan::CaptureBackend;
     let target = vout.win_capture.clone().ok_or_else(|| {
         anyhow::anyhow!(
             "SudoVDA target not yet an active display (needs a WDDM GPU to activate it)"
@@ -404,97 +393,36 @@ pub fn capture_virtual_output(
     })?;
     let pref = vout.preferred_mode;
     let keep = vout.keepalive;
-    // Full-chroma 4:4:4 needs a full-chroma RGB source. The IDD-push and WGC paths emit subsampled
+    // IDD direct-push is the sole Windows capture path: consume frames straight from the pf-vdisplay
-    // NV12/P010 by default, which can't reconstruct 4:4:4; route a 4:4:4 session to DDA, which delivers
+    // driver's shared ring (in-process, Session 0 — it captures the secure desktop too; no Desktop
-    // RGB (Bgra) when its `chroma_444` flag is set. (IDD-push/WGC 4:4:4 capture is a follow-up.)
+    // Duplication, no WGC helper). A FRESH monitor + ring is created per session: a REUSED monitor's
-    if want.chroma_444 && capture != CaptureBackend::Dda {
+    // swap-chain dies after ~2 sessions and can't be revived. The ring is always FP16 when the display
-        tracing::info!("4:4:4 session — using DDA capture (RGB source) instead of {capture:?}");
+    // is HDR (the driver composes the IDD in FP16); `want.hdr` proactively enables advanced color and
-        return dxgi::DuplCapturer::open(target, pref, keep, want.gpu, false, want.chroma_444)
+    // selects the per-frame conversion (FP16 → P010 vs BGRA → NV12). `IddPushCapturer` takes the
-            .map(|c| Box::new(c) as Box<dyn Capturer>);
+    // keepalive (it owns the virtual display). There is NO fallback (DDA + the WGC relay were removed):
-    }
+    // if it can't open or the driver doesn't attach, the session fails cleanly and the client reconnects.
-    // P2 direct frame push (kill DDA): consume frames straight from the pf-vdisplay driver's shared
+    idd_push::IddPushCapturer::open(target, pref, want.hdr, keep)
-    // ring — no Desktop Duplication, no win32u reparenting hook. Resolved once in the `SessionPlan`
+        .map(|c| Box::new(c) as Box<dyn Capturer>)
-    // (was re-derived from `config().idd_push` here); `IddPush` takes the keepalive (owns the virtual
+        .map_err(|(e, _keep)| e.context("IDD-push capture open (no fallback)"))
-    // display) so there's no fall-through.
+}
-    if capture == CaptureBackend::IddPush {
+
-        // Recreate the monitor + ring per session (fix-teardown): a FRESH monitor reliably gets a
+/// Whether the active capturer can deliver a full-chroma (RGB) source for a 4:4:4 HEVC encode. The
-        // working IddCx swap-chain, whereas a REUSED monitor's swap-chain dies after ~2 sessions and
+/// negotiator gates 4:4:4 on this so the host honestly downgrades to 4:2:0 when the capturer can only
-        // the host can't revive it. The driver's recreate crash (target id resolved to 0) is fixed by
+/// produce subsampled frames. Linux (the portal capturer feeding CPU RGB → `yuv444p`) can; the Windows
-        // stamping target_id onto the monitor context. The ring is always FP16 (the driver composes
+/// IDD-push path delivers subsampled NV12/P010 today, so full-chroma capture there is a follow-up.
-        // the IDD in FP16); `want_hdr` selects the per-frame conversion (FP16 → Rgb10a2 vs Bgra).
+#[cfg(target_os = "linux")]
-        // If IDD-push can't open OR the driver doesn't attach to the ring within a few seconds (e.g. a
+pub(crate) fn capturer_supports_444() -> bool {
-        // hybrid-GPU render mismatch), fall back to DDA so the session is NEVER left black (audit §5.1).
+    true
-        // `open()` hands the keepalive back on failure so DDA can take ownership of the virtual display.
+}
-        match idd_push::IddPushCapturer::open(target.clone(), pref, want.hdr, keep) {
+#[cfg(target_os = "windows")]
-            Ok(c) => return Ok(Box::new(c) as Box<dyn Capturer>),
+pub(crate) fn capturer_supports_444() -> bool {
-            Err((e, keep)) => {
+    // IDD-push 4:4:4 (full-chroma RGB from the FP16 ring) is the next step; until then the sole Windows
-                tracing::warn!(
+    // capturer delivers subsampled NV12/P010 only, so the host honestly negotiates 4:2:0.
-                    error = %format!("{e:#}"),
+    false
-                    "IDD-push open/attach failed — falling back to DDA"
+}
-                );
+#[cfg(not(any(target_os = "linux", target_os = "windows")))]
-                return dxgi::DuplCapturer::open(
+pub(crate) fn capturer_supports_444() -> bool {
-                    target,
+    false
-                    pref,
-                    keep,
-                    want.gpu,
-                    false,
-                    want.chroma_444,
-                )
-                .map(|c| Box::new(c) as Box<dyn Capturer>);
-            }
-        }
-    }
-    // WGC (Windows.Graphics.Capture) is the default: it captures the COMPOSED desktop including the
-    // overlay/independent-flip planes DXGI Desktop Duplication misses (the frozen-HDR-animation bug),
-    // and has no ACCESS_LOST-on-overlay churn. DDA stays available via PUNKTFUNK_CAPTURE=dda and is
-    // the secure-desktop (lock/UAC) fallback (WGC can't capture those). `keep` is moved into the
-    // chosen backend (it owns the SudoVDA keepalive), so there's no open-time auto-fallback. The
-    // backend choice (`dda`/`dxgi`/`PUNKTFUNK_NO_WGC` → DDA, else WGC) is now resolved once in the plan.
-    if capture == CaptureBackend::Dda {
-        return dxgi::DuplCapturer::open(target, pref, keep, want.gpu, false, want.chroma_444)
-            .map(|c| Box::new(c) as Box<dyn Capturer>);
-    }
-    // WGC default, with a watchdog'd DDA fallback. WGC's Direct3D11CaptureFramePool::CreateFreeThreaded
-    // intermittently HANGS on the headless SudoVDA (IddCx) display — a blocking call we can't error out
-    // of in place. So run WGC open on a dedicated thread and bound it: if it doesn't finish in time
-    // (hang) or errors, fall back to the reliable DDA path so the session is NEVER left black. WGC,
-    // when it opens, captures the composed desktop (overlay/MPO-correct HDR — fixes frozen animations);
-    // DDA is the safety net (+ the secure-desktop path). The encode thread is set MTA so the WGC
-    // objects built on the watchdog thread (also MTA) are usable here; the keepalive is handed to WGC
-    // only on success, else to DDA. A hung watchdog thread is abandoned (holds no keepalive).
-    // SAFETY: `RoInitialize` is a combase FFI call that initializes the WinRT apartment for the calling
-    // thread. It takes the `RO_INIT_MULTITHREADED` enum by value and borrows no memory, so there is no
-    // pointer/lifetime/aliasing obligation; it is safe on any thread and idempotent — a second call on a
-    // thread already in a compatible apartment returns S_FALSE / RPC_E_CHANGED_MODE, which we discard.
-    // Runs on the encode thread that goes on to use the WGC (WinRT) objects built by the watchdog thread.
-    unsafe {
-        let _ = windows::Win32::System::WinRT::RoInitialize(
-            windows::Win32::System::WinRT::RO_INIT_MULTITHREADED,
-        );
-    }
-    let (tx, rx) = std::sync::mpsc::channel();
-    let t = target.clone();
-    let _ = std::thread::Builder::new()
-        .name("wgc-open".into())
-        .spawn(move || {
-            let _ = tx.send(wgc::WgcCapturer::open(t, pref));
-        });
-    match rx.recv_timeout(std::time::Duration::from_secs(5)) {
-        Ok(Ok(mut c)) => {
-            c.attach_keepalive(keep);
-            Ok(Box::new(c) as Box<dyn Capturer>)
-        }
-        Ok(Err(e)) => {
-            tracing::warn!(error = %format!("{e:#}"), "WGC open failed — falling back to DDA");
-            dxgi::DuplCapturer::open(target, pref, keep, want.gpu, false, want.chroma_444)
-                .map(|c| Box::new(c) as Box<dyn Capturer>)
-        }
-        Err(_) => {
-            tracing::warn!("WGC open timed out (CreateFreeThreaded hang on the virtual display) — falling back to DDA");
-            dxgi::DuplCapturer::open(target, pref, keep, want.gpu, false, want.chroma_444)
-                .map(|c| Box::new(c) as Box<dyn Capturer>)
-        }
-    }
 }
 
 #[cfg(not(any(target_os = "linux", target_os = "windows")))]
@@ -506,14 +434,9 @@ pub fn capture_virtual_output(
     anyhow::bail!("virtual-output capture requires Linux or Windows")
 }
 
-// Goal-1 stage 6: the Windows backends live under `capture/windows/`, the Linux one under `capture/linux/`
+// Goal-1 stage 6: the Windows backend lives under `capture/windows/`, the Linux one under `capture/linux/`
-// (`#[path]` keeps the module names flat, so every `crate::capture::*` path is unchanged).
+// (`#[path]` keeps the module names flat, so every `crate::capture::*` path is unchanged). Windows capture
-#[cfg(target_os = "windows")]
+// is IDD direct-push only — DXGI Desktop Duplication (DDA) and the WGC two-process relay were removed.
-#[path = "capture/windows/composed_flip.rs"]
-pub mod composed_flip;
-#[cfg(target_os = "windows")]
-#[path = "capture/windows/desktop_watch.rs"]
-pub mod desktop_watch;
 #[cfg(target_os = "windows")]
 #[path = "capture/windows/dxgi.rs"]
 pub mod dxgi;
@@ -522,9 +445,3 @@ pub mod dxgi;
 pub mod idd_push;
 #[cfg(target_os = "linux")]
 mod linux;
-#[cfg(target_os = "windows")]
-#[path = "capture/windows/wgc.rs"]
-pub mod wgc;
-#[cfg(target_os = "windows")]
-#[path = "capture/windows/wgc_relay.rs"]
-pub mod wgc_relay;

crates/punktfunk-host/src/capture/windows/composed_flip.rs

@@ -1,217 +0,0 @@
-//! Force-composed-flip overlay (Windows) — make the secure (Winlogon: UAC / lock / login) desktop
-//! capturable by Desktop Duplication.
-//!
-//! The secure desktop's dialog/wallpaper presents via **fullscreen independent-flip / MPO**: it scans
-//! out directly, bypassing DWM composition, so `IDXGIOutputDuplication::AcquireNextFrame` returns
-//! `DXGI_ERROR_ACCESS_LOST` (born-lost) — there is no composed frame to hand out (the client sees
-//! black). Independent-flip requires the presenting app to own the ENTIRE output: putting ANY other
-//! visible window on that output disqualifies it, forcing DWM to **composite**, which DDA can then
-//! capture. So we keep a tiny, click-through, near-invisible **topmost layered window** alive on the
-//! *current input desktop* (which is Winlogon while the secure desktop is up). On a desktop switch the
-//! window is orphaned, so a dedicated thread tracks the input desktop and recreates it there.
-//!
-//! This is the non-input alternative to "tap a key to wake the lock screen": it needs no SendInput and
-//! no system-wide registry change (it does NOT disable MPO globally — it only nudges OUR output to
-//! composed while a session is live). Effectiveness can be build/driver-dependent; gated by
-//! `PUNKTFUNK_FORCE_COMPOSED` (default ON; set =0 to disable).
-
-// Every `unsafe` block in this file carries a `// SAFETY:` proof; enforce it (unsafe-proof program).
-#![deny(clippy::undocumented_unsafe_blocks)]
-
-use std::sync::atomic::{AtomicBool, Ordering};
-use std::sync::Arc;
-use windows::core::w;
-use windows::Win32::Foundation::{HWND, LPARAM, LRESULT, WPARAM};
-use windows::Win32::System::LibraryLoader::GetModuleHandleW;
-use windows::Win32::System::StationsAndDesktops::{
-    CloseDesktop, GetUserObjectInformationW, OpenInputDesktop, SetThreadDesktop,
-    DESKTOP_ACCESS_FLAGS, DESKTOP_CONTROL_FLAGS, UOI_NAME,
-};
-use windows::Win32::UI::WindowsAndMessaging::{
-    CreateWindowExW, DefWindowProcW, DestroyWindow, DispatchMessageW, PeekMessageW, RegisterClassW,
-    SetLayeredWindowAttributes, SetWindowPos, ShowWindow, TranslateMessage, HWND_TOPMOST,
-    LWA_ALPHA, MSG, PM_REMOVE, SWP_NOACTIVATE, SWP_NOMOVE, SWP_NOSIZE, SW_SHOWNOACTIVATE,
-    WNDCLASSW, WS_EX_LAYERED, WS_EX_NOACTIVATE, WS_EX_TOOLWINDOW, WS_EX_TOPMOST, WS_EX_TRANSPARENT,
-    WS_POPUP,
-};
-
-/// A running force-composed-flip overlay. Drop signals the thread to tear down its window + exit.
-pub struct ForceComposedFlip {
-    stop: Arc<AtomicBool>,
-}
-
-impl ForceComposedFlip {
-    /// Start the overlay (no-op + `None` if disabled via `PUNKTFUNK_FORCE_COMPOSED=0`).
-    pub fn start() -> Option<Self> {
-        if std::env::var("PUNKTFUNK_FORCE_COMPOSED").as_deref() == Ok("0") {
-            tracing::info!("force-composed-flip overlay disabled (PUNKTFUNK_FORCE_COMPOSED=0)");
-            return None;
-        }
-        let stop = Arc::new(AtomicBool::new(false));
-        let st = stop.clone();
-        std::thread::Builder::new()
-            .name("composed-flip".into())
-            // SAFETY: `run` is this module's `unsafe fn` (it owns a desktop+window lifecycle via Win32
-            // FFI); it takes ownership of `st` (the stop `Arc<AtomicBool>`) and has no caller-side memory
-            // precondition. It is designed to own its thread for its whole duration — exactly the
-            // dedicated `composed-flip` thread spawned here.
-            .spawn(move || unsafe { run(st) })
-            .ok()?;
-        tracing::info!("force-composed-flip overlay started (Winlogon-aware)");
-        Some(ForceComposedFlip { stop })
-    }
-}
-
-impl Drop for ForceComposedFlip {
-    fn drop(&mut self) {
-        self.stop.store(true, Ordering::Relaxed);
-    }
-}
-
-extern "system" fn wndproc(hwnd: HWND, msg: u32, wp: WPARAM, lp: LPARAM) -> LRESULT {
-    // SAFETY: this is the window procedure the OS invokes with the window's own `hwnd` and a real
-    // message `(msg, wp, lp)`. `DefWindowProcW` performs default processing for exactly those
-    // parameters (all passed straight through by value); it borrows no Rust memory and is synchronous.
-    unsafe { DefWindowProcW(hwnd, msg, wp, lp) }
-}
-
-/// Read the current input-desktop name (e.g. "Default" / "Winlogon"); `None` if it can't be read.
-unsafe fn input_desktop_name() -> Option<String> {
-    let desk = OpenInputDesktop(
-        DESKTOP_CONTROL_FLAGS(0),
-        false,
-        DESKTOP_ACCESS_FLAGS(0x0001),
-    )
-    .ok()?;
-    let mut buf = [0u16; 64];
-    let mut needed = 0u32;
-    let ok = GetUserObjectInformationW(
-        windows::Win32::Foundation::HANDLE(desk.0),
-        UOI_NAME,
-        Some(buf.as_mut_ptr() as *mut _),
-        (buf.len() * 2) as u32,
-        Some(&mut needed),
-    )
-    .is_ok();
-    let _ = CloseDesktop(desk);
-    if !ok {
-        return None;
-    }
-    Some(
-        String::from_utf16_lossy(&buf)
-            .trim_end_matches('\u{0}')
-            .to_string(),
-    )
-}
-
-/// Create the tiny topmost layered click-through window on the CURRENT thread's desktop. Caller must
-/// have `SetThreadDesktop`'d to the target input desktop first.
-unsafe fn make_overlay() -> Option<HWND> {
-    let hinst = GetModuleHandleW(None).ok()?;
-    let class = w!("PunktfunkComposedFlip");
-    // RegisterClassW is idempotent-ish: a second register for the same name fails harmlessly; we
-    // ignore the result and rely on the class existing. (One process, so it registers once.)
-    let wc = WNDCLASSW {
-        lpfnWndProc: Some(wndproc),
-        hInstance: hinst.into(),
-        lpszClassName: class,
-        ..Default::default()
-    };
-    let atom = RegisterClassW(&wc);
-    if atom == 0 {
-        let e = windows::Win32::Foundation::GetLastError();
-        // 1410 = ERROR_CLASS_ALREADY_EXISTS is fine (re-register after a desktop switch).
-        if e.0 != 1410 {
-            tracing::warn!(err = e.0, "force-composed-flip: RegisterClassW failed");
-        }
-    }
-    let hwnd = match CreateWindowExW(
-        WS_EX_LAYERED | WS_EX_TRANSPARENT | WS_EX_TOPMOST | WS_EX_NOACTIVATE | WS_EX_TOOLWINDOW,
-        class,
-        w!(""),
-        WS_POPUP,
-        0,
-        0,
-        1,
-        1,
-        None,
-        None,
-        Some(hinst.into()),
-        None,
-    ) {
-        Ok(h) => h,
-        Err(e) => {
-            let le = windows::Win32::Foundation::GetLastError();
-            tracing::warn!(err = %format!("{e:?}"), last = le.0,
-                "force-composed-flip: CreateWindowExW failed");
-            return None;
-        }
-    };
-    // alpha=1: technically visible (so it disqualifies independent-flip) but imperceptible.
-    let _ = SetLayeredWindowAttributes(hwnd, windows::Win32::Foundation::COLORREF(0), 1, LWA_ALPHA);
-    let _ = ShowWindow(hwnd, SW_SHOWNOACTIVATE);
-    let _ = SetWindowPos(
-        hwnd,
-        Some(HWND_TOPMOST),
-        0,
-        0,
-        0,
-        0,
-        SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE,
-    );
-    Some(hwnd)
-}
-
-unsafe fn run(stop: Arc<AtomicBool>) {
-    let mut cur_desktop: Option<String> = None;
-    let mut hwnd: Option<HWND> = None;
-    let mut ticks: u32 = 0;
-    while !stop.load(Ordering::Relaxed) {
-        // Follow the input desktop: if it changed (Default↔Winlogon), re-attach this thread and
-        // recreate the window there (a window is bound to the desktop it was created on).
-        let name = input_desktop_name();
-        if name != cur_desktop {
-            if let Some(h) = hwnd.take() {
-                let _ = DestroyWindow(h);
-            }
-            if let Ok(desk) = OpenInputDesktop(
-                DESKTOP_CONTROL_FLAGS(0),
-                false,
-                DESKTOP_ACCESS_FLAGS(0x1000_0000), // GENERIC_ALL (incl. DESKTOP_CREATEWINDOW=0x0002)
-            ) {
-                if SetThreadDesktop(desk).is_ok() {
-                    hwnd = make_overlay();
-                    tracing::info!(desktop = ?name, created = hwnd.is_some(),
-                        "force-composed-flip: overlay (re)created on input desktop");
-                }
-                // Leak `desk` while it's the thread desktop (closing the current thread desktop is UB).
-            }
-            cur_desktop = name;
-        }
-        // Re-assert topmost periodically (other windows on the secure desktop can push us down) and
-        // pump our message queue so the window stays responsive/composited.
-        if let Some(h) = hwnd {
-            let _ = SetWindowPos(
-                h,
-                Some(HWND_TOPMOST),
-                0,
-                0,
-                0,
-                0,
-                SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE,
-            );
-            let mut msg = MSG::default();
-            while PeekMessageW(&mut msg, Some(h), 0, 0, PM_REMOVE).as_bool() {
-                let _ = TranslateMessage(&msg);
-                DispatchMessageW(&msg);
-            }
-        }
-        ticks = ticks.wrapping_add(1);
-        let _ = ticks;
-        std::thread::sleep(std::time::Duration::from_millis(200));
-    }
-    if let Some(h) = hwnd.take() {
-        let _ = DestroyWindow(h);
-    }
-    tracing::info!("force-composed-flip overlay stopped");
-}

crates/punktfunk-host/src/capture/windows/desktop_watch.rs

@@ -1,144 +0,0 @@
-//! Input-desktop watcher (Windows) — the authoritative "normal vs secure desktop" signal for the
-//! two-process secure-desktop design (design/archive/windows-secure-desktop.md).
-//!
-//! Windows switches the *input desktop* to "Winlogon" (the secure desktop) for UAC elevation, the
-//! lock screen and the login screen, and back to "Default" for the normal session. WGC captures only
-//! the normal desktop; DDA-as-SYSTEM captures the secure one. A dedicated thread polls the input
-//! desktop's NAME (WTS session notifications miss UAC entirely, so the name is the reliable signal)
-//! and publishes it as an atomic the capture mux + input path read.
-
-// Every `unsafe` block in this file carries a `// SAFETY:` proof; enforce it (unsafe-proof program).
-#![deny(clippy::undocumented_unsafe_blocks)]
-
-use std::sync::atomic::{AtomicBool, AtomicU8, Ordering};
-use std::sync::Arc;
-use std::time::Duration;
-use windows::Win32::Foundation::HANDLE;
-use windows::Win32::System::StationsAndDesktops::{
-    CloseDesktop, GetUserObjectInformationW, OpenInputDesktop, DESKTOP_ACCESS_FLAGS,
-    DESKTOP_CONTROL_FLAGS, UOI_NAME,
-};
-
-/// The normal interactive desktop ("Default") — WGC capture applies.
-pub const DESKTOP_NORMAL: u8 = 0;
-/// The secure desktop ("Winlogon": UAC / lock / login) — DDA-as-SYSTEM capture applies.
-pub const DESKTOP_SECURE: u8 = 1;
-
-/// Polls the input-desktop name on its own thread and publishes [`DESKTOP_NORMAL`]/[`DESKTOP_SECURE`].
-pub struct DesktopWatcher {
-    state: Arc<AtomicU8>,
-    stop: Arc<AtomicBool>,
-}
-
-impl DesktopWatcher {
-    pub fn start() -> Self {
-        // Compute the CURRENT desktop synchronously before returning, so the first reader (the capture
-        // mux) sees the real state immediately. Otherwise a session that begins already on the secure
-        // desktop (e.g. a reconnect to a locked box) would read DESKTOP_NORMAL for the first poll
-        // interval and relay one stale normal-desktop frame — the "flash of the login screen" bug.
-        // SAFETY: `is_secure_desktop` is this module's `unsafe fn` — unsafe only because it calls Win32
-        // desktop FFI (`OpenInputDesktop`/`GetUserObjectInformationW`/`CloseDesktop`), with no caller
-        // precondition; it opens, names, and closes the input-desktop handle internally and is safe to
-        // call from any thread (here, on the thread running `DesktopWatcher::start`).
-        let initial = if unsafe { is_secure_desktop() } {
-            DESKTOP_SECURE
-        } else {
-            DESKTOP_NORMAL
-        };
-        let state = Arc::new(AtomicU8::new(initial));
-        let stop = Arc::new(AtomicBool::new(false));
-        let s = state.clone();
-        let st = stop.clone();
-        let _ = std::thread::Builder::new()
-            .name("desktop-watch".into())
-            .spawn(move || {
-                // Debounce: only publish a change after the raw reading has been stable for several
-                // polls. The input desktop flaps Default↔Winlogon transiently during a lock/UAC
-                // transition; publishing every flap makes the capture mux thrash (rebuild storms).
-                const STABLE_POLLS: u32 = 4; // ~80ms
-                let mut published = initial;
-                let mut candidate = initial;
-                let mut stable = 0u32;
-                while !st.load(Ordering::Relaxed) {
-                    // SAFETY: same as in `start` — `is_secure_desktop` is self-contained Win32 desktop
-                    // FFI with no caller precondition, called here on the dedicated `desktop-watch`
-                    // polling thread.
-                    let v = if unsafe { is_secure_desktop() } {
-                        DESKTOP_SECURE
-                    } else {
-                        DESKTOP_NORMAL
-                    };
-                    if v == candidate {
-                        stable = stable.saturating_add(1);
-                    } else {
-                        candidate = v;
-                        stable = 1;
-                    }
-                    if stable >= STABLE_POLLS && candidate != published {
-                        s.store(candidate, Ordering::Release);
-                        published = candidate;
-                        tracing::info!(
-                            desktop = if candidate == DESKTOP_SECURE {
-                                "Winlogon(secure)"
-                            } else {
-                                "Default"
-                            },
-                            "input desktop changed (debounced)"
-                        );
-                    }
-                    std::thread::sleep(Duration::from_millis(20));
-                }
-            });
-        DesktopWatcher { state, stop }
-    }
-
-    /// The shared atomic ([`DESKTOP_NORMAL`]/[`DESKTOP_SECURE`]) for the capture mux to read.
-    pub fn state(&self) -> Arc<AtomicU8> {
-        self.state.clone()
-    }
-
-    /// True when the secure (Winlogon) desktop is the input desktop right now.
-    pub fn is_secure(&self) -> bool {
-        self.state.load(Ordering::Acquire) == DESKTOP_SECURE
-    }
-}
-
-impl Drop for DesktopWatcher {
-    fn drop(&mut self) {
-        self.stop.store(true, Ordering::Relaxed);
-    }
-}
-
-/// True if the current input desktop is "Winlogon" (the secure desktop). Best-effort: if the desktop
-/// can't be opened or named, report not-secure (the safe default — keep WGC/normal capture).
-pub(crate) unsafe fn is_secure_desktop() -> bool {
-    let desk = match OpenInputDesktop(
-        DESKTOP_CONTROL_FLAGS(0),
-        false,
-        DESKTOP_ACCESS_FLAGS(DESKTOP_READOBJECTS),
-    ) {
-        Ok(d) => d,
-        Err(_) => return false,
-    };
-    let mut buf = [0u16; 64];
-    let mut needed = 0u32;
-    let ok = GetUserObjectInformationW(
-        HANDLE(desk.0),
-        UOI_NAME,
-        Some(buf.as_mut_ptr() as *mut _),
-        (buf.len() * 2) as u32,
-        Some(&mut needed),
-    )
-    .is_ok();
-    let _ = CloseDesktop(desk);
-    if !ok {
-        return false;
-    }
-    let name = String::from_utf16_lossy(&buf);
-    name.trim_end_matches('\u{0}')
-        .eq_ignore_ascii_case("Winlogon")
-}
-
-/// `DESKTOP_READOBJECTS` access right (the windows crate exposes it as a typed flag; we need the raw
-/// bit for `OpenInputDesktop`'s access mask).
-const DESKTOP_READOBJECTS: u32 = 0x0001;

crates/punktfunk-host/src/capture/windows/idd_push.rs

@@ -1,8 +1,8 @@
-//! P2 direct frame push (kill DDA) — HOST side. The pf-vdisplay driver runs in a restricted WUDFHost
+//! P2 direct frame push (kill DDA) — HOST side. The pf-vdisplay driver's WUDFHost canNOT create named
-//! token that canNOT create named kernel objects, so — exactly like the gamepad UMDF drivers
+//! kernel objects, so — exactly like the gamepad UMDF drivers (`inject/dualsense_windows.rs`) — the
-//! (`inject/dualsense_windows.rs`) — the HOST (privileged) CREATES the shared header + frame-ready
+//! HOST (privileged) CREATES the shared header + frame-ready event + ring of keyed-mutex textures
-//! event + ring of keyed-mutex textures (`Global\` names, permissive `D:(A;;GA;;;WD)` SDDL) on the
+//! (`Global\` names, scoped `D:(A;;GA;;;SY)(A;;GA;;;LS)` to SYSTEM + the driver's LocalService host —
-//! discrete render GPU, and the driver only OPENS them and copies frames in. We then consume the ring
+//! see `shared_object_sa`) on the discrete render GPU, and the driver only OPENS them and copies frames in. We then consume the ring
 //! straight into the zero-copy NVENC path — no DXGI Desktop Duplication, no `win32u` hook. Gated by
 //! `PUNKTFUNK_IDD_PUSH`. Driver counterpart: `packaging/windows/drivers/pf-vdisplay/src/
 //! frame_transport.rs`. The shared `SharedHeader` layout, `MAGIC`/`VERSION`/`RING_LEN`, the
@@ -236,13 +236,17 @@ pub struct IddPushCapturer {
 // ownership to one thread at a time with NO concurrent access; we do not (and must not) claim `Sync`.
 unsafe impl Send for IddPushCapturer {}
 
-/// Build a permissive (Everyone:GenericAll) `SECURITY_ATTRIBUTES` so the restricted WUDFHost driver
+/// Build a `SECURITY_ATTRIBUTES` granting GENERIC_ALL to **SYSTEM** (the host creates+publishes the
-/// can OPEN the host-created objects — the same `D:(A;;GA;;;WD)` SDDL the gamepad shared section uses.
+/// shared event + texture ring) and **LocalService** (the account the pf_vdisplay WUDFHost runs under,
-/// The returned `psd` backing must outlive `sa`; both are dropped when the process exits.
+/// which consumes them) — `D:(A;;GA;;;SY)(A;;GA;;;LS)`, the same scoping as the gamepad section. The
-unsafe fn permissive_sa() -> Result<(SECURITY_ATTRIBUTES, PSECURITY_DESCRIPTOR)> {
+/// old SDDL granted **Everyone** (`WD`), which let any local user open the `Global\pfvd-*` objects and
+/// read captured screen frames (security-review 2026-06-28 #5). Verified on the RTX box (2026-06-29):
+/// the WUDFHost token is `S-1-5-19` (LocalService), SYSTEM integrity, zero restricted SIDs — so SY+LS
+/// suffices for the driver and excludes normal user processes. `psd` must outlive `sa`.
+unsafe fn shared_object_sa() -> Result<(SECURITY_ATTRIBUTES, PSECURITY_DESCRIPTOR)> {
     let mut psd = PSECURITY_DESCRIPTOR::default();
     ConvertStringSecurityDescriptorToSecurityDescriptorW(
-        w!("D:(A;;GA;;;WD)"),
+        w!("D:(A;;GA;;;SY)(A;;GA;;;LS)"),
         SDDL_REVISION_1,
         &mut psd,
         None,
@@ -269,7 +273,7 @@ impl IddPushCapturer {
         h: u32,
         format: DXGI_FORMAT,
     ) -> Result<Vec<HostSlot>> {
-        let (sa, _psd) = permissive_sa()?;
+        let (sa, _psd) = shared_object_sa()?;
         let mut slots = Vec::new();
         for k in 0..RING_LEN {
             let desc = D3D11_TEXTURE2D_DESC {
@@ -375,7 +379,7 @@ impl IddPushCapturer {
         // SAFETY: one block over the whole ring setup; every operation in it is sound:
         // - `set_advanced_color`/`advanced_color_enabled` are `unsafe fn`s taking only a copy of the plain
         //   `u32` target id; they read/flip CCD display config and return owned values, borrowing nothing.
-        // - `CreateDXGIFactory1`, `EnumAdapterByLuid`, `make_device`, `permissive_sa`, `CreateFileMappingW`,
+        // - `CreateDXGIFactory1`, `EnumAdapterByLuid`, `make_device`, `shared_object_sa`, `CreateFileMappingW`,
         //   `MapViewOfFile`, `CreateEventW`, and `create_ring_slots` are all `?`-checked, so every returned
         //   interface/handle/view is non-error before use; `&sa`/`&adapter`/`&device`/the `&HSTRING` names
         //   are live borrows that outlive each synchronous call, and `sa.lpSecurityDescriptor` stays valid
@@ -421,7 +425,7 @@ impl IddPushCapturer {
                 .context("EnumAdapterByLuid(render adapter) for IDD push")?;
             let (device, context) = make_device(&adapter).context("make_device for IDD push")?;
 
-            let (sa, _psd) = permissive_sa()?;
+            let (sa, _psd) = shared_object_sa()?;
             let bytes = std::mem::size_of::<SharedHeader>().max(64);
 
             // Header.

crates/punktfunk-host/src/capture/windows/wgc.rs

@@ -1,816 +0,0 @@
-//! Windows.Graphics.Capture (WGC) capture backend — the HDR/animation-correct path.
-//!
-//! Why WGC over DXGI Desktop Duplication: DDA duplicates only the DWM-composed primary surface, so
-//! HDR desktop animations the OS routes onto hardware overlay / independent-flip / MPO planes (Start
-//! menu, Win11 Mica/acrylic, window resize) never enter the surface DDA reads — the stream shows a
-//! frozen desktop ("broken HDR animations"). Engaging WGC capture pulls that content back through DWM
-//! composition, so the surface WGC hands back contains the animations. WGC also has no
-//! ACCESS_LOST-on-overlay-flip churn.
-//!
-//! It reuses the rest of the pipeline UNCHANGED: the frame's GPU texture (the OS already composited
-//! the cursor into it — `IsCursorCaptureEnabled(true)`) goes through the same scRGB→BT.2020-PQ shader
-//! ([`super::dxgi::HdrConverter`]) into a host-owned `R10G10B10A2` texture (HDR) or is copied into a
-//! BGRA texture (SDR), which is handed to NVENC zero-copy (registered by pointer, encoded in place).
-//! Shares the D3D11 device with NVENC via `FramePayload::D3d11`.
-//!
-//! Limitation: WGC cannot capture the secure desktop (lock / UAC / login) — the caller falls back to
-//! the DDA backend ([`super::dxgi::DuplCapturer`]) for those (see capture.rs).
-
-// Every `unsafe` block in this file carries a `// SAFETY:` proof; enforce it (unsafe-proof program).
-#![deny(clippy::undocumented_unsafe_blocks)]
-
-use super::dxgi::{
-    find_output, hdr_shader_p010_enabled, make_device, nudge_cursor_onto, D3d11Frame, HdrConverter,
-    HdrP010Converter, VideoConverter, WinCaptureTarget,
-};
-use super::{CapturedFrame, Capturer, FramePayload, PixelFormat};
-use anyhow::{bail, Context, Result};
-use std::collections::VecDeque;
-use std::sync::atomic::{AtomicU64, Ordering};
-use std::sync::{Arc, Condvar, Mutex};
-use std::time::{Duration, Instant};
-use windows::core::{IInspectable, Interface};
-use windows::Foundation::{TimeSpan, TypedEventHandler};
-use windows::Graphics::Capture::{
-    Direct3D11CaptureFrame, Direct3D11CaptureFramePool, GraphicsCaptureItem, GraphicsCaptureSession,
-};
-use windows::Graphics::DirectX::DirectXPixelFormat;
-use windows::Win32::Foundation::{CloseHandle, HANDLE};
-use windows::Win32::Graphics::Direct3D11::{
-    ID3D11Device, ID3D11DeviceContext, ID3D11RenderTargetView, ID3D11ShaderResourceView,
-    ID3D11Texture2D, D3D11_BIND_RENDER_TARGET, D3D11_BIND_SHADER_RESOURCE, D3D11_TEXTURE2D_DESC,
-    D3D11_USAGE_DEFAULT,
-};
-use windows::Win32::Graphics::Dxgi::Common::{
-    DXGI_COLOR_SPACE_RGB_FULL_G2084_NONE_P2020, DXGI_FORMAT_R10G10B10A2_UNORM,
-    DXGI_FORMAT_R16G16B16A16_FLOAT, DXGI_SAMPLE_DESC,
-};
-use windows::Win32::Graphics::Dxgi::{IDXGIDevice, IDXGIOutput6};
-use windows::Win32::Security::{ImpersonateLoggedOnUser, RevertToSelf};
-use windows::Win32::System::RemoteDesktop::{WTSGetActiveConsoleSessionId, WTSQueryUserToken};
-use windows::Win32::System::WinRT::Direct3D11::{
-    CreateDirect3D11DeviceFromDXGIDevice, IDirect3DDxgiInterfaceAccess,
-};
-use windows::Win32::System::WinRT::Graphics::Capture::IGraphicsCaptureItemInterop;
-use windows::Win32::System::WinRT::{RoInitialize, RO_INIT_MULTITHREADED};
-
-/// Output texture ring depth. The encode loop pipelines one frame deep (NVENC encodes frame N while
-/// the capturer produces N+1), so two live textures suffice; three gives headroom against a slow
-/// `lock_bitstream` and matches the WGC frame-pool depth.
-// Sized for the deep encode pipeline (`PUNKTFUNK_ENCODE_DEPTH`, default 4, clamped ≤ 6): up to DEPTH
-// frames are in flight in NVENC at once, so the HDR convert ring and the SDR held-frame set must each
-// keep DEPTH(+headroom) live textures, and the WGC pool needs spare buffers beyond what we hold.
-const OUT_RING: usize = 8;
-
-/// SDR zero-copy: how many recent WGC frames to keep alive so NVENC can encode the pool texture in
-/// place (no `CopyResource`). Each in-flight encode reads a distinct frame, so this must exceed the
-/// pipeline depth; the oldest is released once `HELD_FRAMES` newer ones exist.
-const HELD_FRAMES: usize = 8;
-/// WGC frame-pool buffer count. Must exceed `HELD_FRAMES` so the compositor always has free buffers
-/// to render into while we hold frames for in-place (zero-copy) SDR encode.
-const WGC_POOL_BUFFERS: i32 = 10;
-
-/// The host runs as SYSTEM (so the DDA secure-desktop path works), but WGC will NOT activate under
-/// the SYSTEM account (`CreateForMonitor` → 0x80070424). Impersonate the interactive console user
-/// for the WGC activation. Returns the user token (the caller reverts + closes it after activation)
-/// or `None` (no active user, or the host already runs AS the user — WTSQueryUserToken then fails and
-/// WGC works without impersonation). SYSTEM-only; harmless under a user-token host.
-unsafe fn impersonate_active_user() -> Option<HANDLE> {
-    let session = WTSGetActiveConsoleSessionId();
-    if session == 0xFFFF_FFFF {
-        return None;
-    }
-    let mut token = HANDLE::default();
-    if WTSQueryUserToken(session, &mut token).is_ok() {
-        if ImpersonateLoggedOnUser(token).is_ok() {
-            return Some(token);
-        }
-        let _ = CloseHandle(token);
-    }
-    None
-}
-
-/// RAII: reverts the WGC-activation impersonation when it drops (covers every `?` early-return).
-struct Deimpersonate(Option<HANDLE>);
-impl Drop for Deimpersonate {
-    fn drop(&mut self) {
-        if let Some(tok) = self.0.take() {
-            // SAFETY: `RevertToSelf` takes no arguments and undoes the thread impersonation set during
-            // WGC activation; `tok` is the impersonation token `HANDLE` from `impersonate_active_user`,
-            // owned by this `Deimpersonate` and closed exactly once here (taken out of the `Option`, so
-            // no double-close). Both are FFI calls borrowing no Rust memory.
-            unsafe {
-                let _ = RevertToSelf();
-                let _ = CloseHandle(tok);
-            }
-        }
-    }
-}
-
-/// Signal from the free-threaded FrameArrived callback to the encode thread: a monotonically
-/// increasing count of arrived frames + a condvar to wake `next_frame`. The encode thread tracks how
-/// many it has consumed; `TryGetNextFrame` is called exactly `available - consumed` times so we never
-/// hit the empty-pool ambiguity, and draining to the newest keeps latency at one frame.
-struct WgcSignal {
-    available: AtomicU64,
-    mtx: Mutex<()>,
-    cv: Condvar,
-}
-
-pub struct WgcCapturer {
-    device: ID3D11Device,
-    context: ID3D11DeviceContext,
-    // WGC objects — kept alive for the session's lifetime.
-    pool: Direct3D11CaptureFramePool,
-    session: GraphicsCaptureSession,
-    _item: GraphicsCaptureItem,
-    _frame_arrived_token: i64,
-    signal: Arc<WgcSignal>,
-    consumed: u64,
-
-    width: u32,
-    height: u32,
-    timeout_ms: u64,
-    first_frame: bool,
-
-    hdr: bool,
-    /// The source display's static HDR mastering metadata (ST.2086 + content light level), read from
-    /// `IDXGIOutput6::GetDesc1` at open when the output is HDR. Forwarded to the encoder (in-band SEI)
-    /// and the client (0xCE) by the stream loop. `None` when SDR. (The helper relay path also encodes,
-    /// so this is what gives the secure/normal-desktop HDR stream its mastering SEI.)
-    hdr_meta: Option<punktfunk_core::quic::HdrMeta>,
-    hdr_conv: Option<HdrConverter>,
-    fp16_src: Option<ID3D11Texture2D>,
-    fp16_srv: Option<ID3D11ShaderResourceView>,
-    /// `PUNKTFUNK_HDR_SHADER_P010` path: emit P010 (BT.2020 PQ 10-bit limited range) DIRECTLY from our
-    /// own shader (`HdrP010Converter`) so NVENC takes native P010 and skips its SM-side RGB→YUV CSC.
-    /// Gated by [`hdr_shader_p010_enabled`] AND `self.hdr`; `None`/empty when off → the existing R10 +
-    /// VideoProcessor paths run unchanged. `p010_disabled` latches a runtime failure (e.g. a driver
-    /// that rejects the planar plane RTV) so we fall back to the R10 path and stop retrying.
-    hdr_p010_conv: Option<HdrP010Converter>,
-    p010_out: Vec<ID3D11Texture2D>,
-    p010_idx: usize,
-    p010_disabled: bool,
-    /// Ring of host-owned output textures (BGRA for SDR, R10G10B10A2 for HDR), rotated per processed
-    /// frame. A ring — not one texture — is required because the encode loop is PIPELINED: NVENC
-    /// encodes frame N (in place, registered by pointer) while this capturer produces frame N+1, so
-    /// N+1 must land in a DIFFERENT texture or it clobbers the in-flight encode. (`fp16_src` stays
-    /// single: it's only touched within the D3D11 immediate context, whose op ordering already
-    /// serializes the convert's read against the next copy's write — NVENC's async engine read is the
-    /// only consumer that escapes that ordering, and it reads the ring output, never `fp16_src`.)
-    out_ring: Vec<ID3D11Texture2D>,
-    ring_idx: usize,
-    /// Video-processor RGB→YUV converter (off the 3D engine where possible) + its NV12/P010 output
-    /// ring. Preferred path: the OS-composited capture (cursor already in it) is converted DIRECTLY to
-    /// NVENC's native YUV — no `CopyResource`, no cursor draw, and NVENC skips its internal RGB→YUV.
-    /// `None`/error → falls back to the legacy SDR-zero-copy / HDR-shader paths.
-    video_conv: Option<VideoConverter>,
-    yuv_out: Vec<ID3D11Texture2D>,
-    yuv_idx: usize,
-    yuv_is_hdr: bool,
-    vp_disabled: bool,
-    /// SDR zero-copy: the recent WGC frames we hand to NVENC in place. Held so the pool doesn't
-    /// recycle the texture mid-encode; the oldest is released once `HELD_FRAMES` newer ones exist.
-    held: VecDeque<Direct3D11CaptureFrame>,
-    /// Last presentable GPU texture + format, repeated when no new frame arrived (static desktop).
-    last_present: Option<(ID3D11Texture2D, PixelFormat)>,
-
-    /// Owns the SudoVDA keepalive once attached (after WGC is confirmed open) — dropping the capturer
-    /// then REMOVEs the virtual output. `None` between open and attach so a WGC-open failure leaves
-    /// the keepalive with the caller for the DDA fallback.
-    _keepalive: Option<Box<dyn Send>>,
-}
-
-// SAFETY: like `DuplCapturer`. `WgcCapturer` holds D3D11 (free-threaded device/context) plus WGC WinRT
-// objects (`Direct3D11CaptureFramePool` etc., created free-threaded via `CreateFreeThreaded`). COM/WinRT
-// reference counting is interlocked, and the capturer is owned + used by exactly one encode thread,
-// moved to it once and never shared (no `Sync`), so transferring ownership across threads is sound. The
-// free-threaded `FrameArrived` callback touches only the `Arc<WgcSignal>` (itself `Send + Sync`), not
-// the capturer's COM fields.
-unsafe impl Send for WgcCapturer {}
-
-impl WgcCapturer {
-    /// Open WGC capture. Does NOT take the keepalive — the caller attaches it via
-    /// [`attach_keepalive`](Self::attach_keepalive) only after open succeeds, so a failure leaves the
-    /// keepalive with the caller to hand to the DDA fallback.
-    pub fn open(target: WinCaptureTarget, preferred: Option<(u32, u32, u32)>) -> Result<Self> {
-        // SAFETY: runs on the thread opening the WGC session. `RoInitialize` inits this thread's WinRT
-        // apartment (idempotent; result ignored). `impersonate_active_user()` and `find_output()` are
-        // this module's `unsafe fn`s whose contracts (call on the activating thread; pass a GDI name)
-        // are met, and the impersonation is reverted by `_deimp`'s Drop on every return path. Every
-        // COM/WinRT call thereafter operates on an object obtained + `?`-checked earlier in this same
-        // block on this single thread — the `IDXGIOutput1` from `find_output`, the device/context from
-        // `make_device`, the factory/interop/item/pool/session — and the `TypedEventHandler` closure
-        // captures an `Arc<WgcSignal>` (Send+Sync) by move. No raw pointers are dereferenced; borrowed
-        // locals outlive their synchronous calls.
-        unsafe {
-            // WGC is WinRT — the calling thread needs a COM/WinRT apartment for the GraphicsCaptureItem
-            // activation factory (RoGetActivationFactory). Initialize MTA; ignore "already initialized"
-            // / "changed mode" (another component on this thread may have init'd a compatible apartment).
-            let ro = RoInitialize(RO_INIT_MULTITHREADED);
-            // Impersonate the interactive user for the duration of WGC activation (host runs as
-            // SYSTEM; WGC won't activate under SYSTEM). Reverted by the guard's Drop on return. The
-            // WGC objects, once created, are accessed from the (SYSTEM) encode thread thereafter.
-            let imp = impersonate_active_user();
-            let _deimp = Deimpersonate(imp);
-            tracing::info!(ro_result = ?ro, impersonated = imp.is_some(), "WGC: RoInitialize(MTA)");
-            // The SudoVDA output appears a beat after the display is created — settle-retry like DDA.
-            let deadline = Instant::now() + Duration::from_millis(2000);
-            let (adapter, output) = loop {
-                if let Some(n) = crate::win_display::resolve_gdi_name(target.target_id) {
-                    if let Ok(found) = find_output(&n) {
-                        break found;
-                    }
-                }
-                if let Ok(found) = find_output(&target.gdi_name) {
-                    break found;
-                }
-                if Instant::now() >= deadline {
-                    bail!(
-                        "WGC: no DXGI output for SudoVDA target {} yet",
-                        target.target_id
-                    );
-                }
-                std::thread::sleep(Duration::from_millis(100));
-            };
-
-            let (device, context) = make_device(&adapter)?;
-            let od = output.GetDesc().context("output GetDesc")?;
-            let hmonitor = od.Monitor;
-
-            // HDR iff the output's colour space is BT.2020 PQ (G2084) — matches the DDA FP16 detection.
-            // From the same desc, read the source display's mastering metadata (ST.2086) when HDR.
-            let desc1 = output
-                .cast::<IDXGIOutput6>()
-                .ok()
-                .and_then(|o6| o6.GetDesc1().ok());
-            let hdr = desc1
-                .as_ref()
-                .map(|d1| d1.ColorSpace == DXGI_COLOR_SPACE_RGB_FULL_G2084_NONE_P2020)
-                .unwrap_or(false);
-            let hdr_meta = if hdr {
-                desc1.as_ref().map(|d| {
-                    crate::hdr::hdr_meta_from_display(
-                        (d.RedPrimary[0], d.RedPrimary[1]),
-                        (d.GreenPrimary[0], d.GreenPrimary[1]),
-                        (d.BluePrimary[0], d.BluePrimary[1]),
-                        (d.WhitePoint[0], d.WhitePoint[1]),
-                        d.MaxLuminance,
-                        d.MinLuminance,
-                        0, // MaxCLL: GetDesc1 has no content light level (Apollo zeroes it)
-                        0, // MaxFALL
-                    )
-                })
-            } else {
-                None
-            };
-
-            // Wrap our D3D11 device as a WinRT IDirect3DDevice so the frame pool allocates on it (the
-            // pool textures land on our device → CopyResource + NVENC are same-device, no readback).
-            let dxgi_device: IDXGIDevice = device.cast().context("ID3D11Device as IDXGIDevice")?;
-            let inspectable: IInspectable = CreateDirect3D11DeviceFromDXGIDevice(&dxgi_device)
-                .context("CreateDirect3D11DeviceFromDXGIDevice")?;
-            let d3d_device: windows::Graphics::DirectX::Direct3D11::IDirect3DDevice = inspectable
-                .cast()
-                .context("IInspectable as IDirect3DDevice")?;
-
-            tracing::info!(hdr, "WGC: device ready, creating capture item");
-            // GraphicsCaptureItem for the monitor (the SudoVDA output enumerates as a normal monitor).
-            let interop: IGraphicsCaptureItemInterop =
-                windows::core::factory::<GraphicsCaptureItem, IGraphicsCaptureItemInterop>()
-                    .context("GraphicsCaptureItem interop factory")?;
-            let item: GraphicsCaptureItem = interop
-                .CreateForMonitor(hmonitor)
-                .context("CreateForMonitor")?;
-            let size = item.Size().context("item Size")?;
-            let (width, height) = (size.Width.max(0) as u32, size.Height.max(0) as u32);
-            tracing::info!(
-                width,
-                height,
-                "WGC: capture item created, creating frame pool"
-            );
-
-            let pixel_format = if hdr {
-                DirectXPixelFormat::R16G16B16A16Float // scRGB FP16 — same surface DDA gives on HDR
-            } else {
-                DirectXPixelFormat::B8G8R8A8UIntNormalized
-            };
-            // Extra buffers: SDR zero-copy holds the last `HELD_FRAMES` frames (encoded in place), so
-            // the pool needs headroom beyond that for the producer to keep rendering at 240 Hz.
-            let pool = Direct3D11CaptureFramePool::CreateFreeThreaded(
-                &d3d_device,
-                pixel_format,
-                WGC_POOL_BUFFERS,
-                size,
-            )
-            .context("CreateFreeThreaded frame pool")?;
-
-            let signal = Arc::new(WgcSignal {
-                available: AtomicU64::new(0),
-                mtx: Mutex::new(()),
-                cv: Condvar::new(),
-            });
-            let sig = signal.clone();
-            let handler = TypedEventHandler::<Direct3D11CaptureFramePool, IInspectable>::new(
-                move |_pool, _arg| {
-                    sig.available.fetch_add(1, Ordering::Release);
-                    sig.cv.notify_one();
-                    Ok(())
-                },
-            );
-            let token = pool.FrameArrived(&handler).context("FrameArrived")?;
-
-            tracing::info!("WGC: creating capture session");
-            let session = pool
-                .CreateCaptureSession(&item)
-                .context("CreateCaptureSession")?;
-            // OS composites the cursor into the frame (HDR-correct, no manual composite pass).
-            let _ = session.SetIsCursorCaptureEnabled(true);
-            // Drop the yellow capture border (best-effort — older builds reject it).
-            let _ = session.SetIsBorderRequired(false);
-            // Lift the 60 Hz cap: allow up to the client's refresh (Win11 24H2+; below that this is a
-            // no-op and WGC caps ~60). 100 ns ticks per frame.
-            let refresh = preferred
-                .map(|(_, _, hz)| hz)
-                .filter(|&hz| hz > 0)
-                .unwrap_or(60);
-            let ticks = (10_000_000i64 / refresh.max(1) as i64).max(1);
-            let _ = session.SetMinUpdateInterval(TimeSpan { Duration: ticks });
-            tracing::info!("WGC: StartCapture");
-            session.StartCapture().context("StartCapture")?;
-            // WGC fires FrameArrived on CHANGE; a static desktop may never deliver the first frame
-            // (→ black, then the next_frame deadline ends the session). Nudge the cursor onto the
-            // output to force the first composition change, exactly like the DDA path does.
-            nudge_cursor_onto(&output);
-
-            let timeout_ms = (2000 / refresh.max(1) as u64).max(8);
-            tracing::info!(
-                width,
-                height,
-                hdr,
-                refresh,
-                "WGC capture started ({})",
-                if hdr {
-                    "HDR FP16→BT.2020 PQ"
-                } else {
-                    "SDR BGRA"
-                }
-            );
-
-            Ok(Self {
-                device,
-                context,
-                pool,
-                session,
-                _item: item,
-                _frame_arrived_token: token,
-                signal,
-                consumed: 0,
-                width,
-                height,
-                timeout_ms,
-                first_frame: true,
-                hdr,
-                hdr_meta,
-                hdr_conv: None,
-                fp16_src: None,
-                fp16_srv: None,
-                hdr_p010_conv: None,
-                p010_out: Vec::new(),
-                p010_idx: 0,
-                p010_disabled: false,
-                out_ring: Vec::new(),
-                ring_idx: 0,
-                video_conv: None,
-                yuv_out: Vec::new(),
-                yuv_idx: 0,
-                yuv_is_hdr: false,
-                vp_disabled: std::env::var_os("PUNKTFUNK_NO_VIDEO_PROCESSOR").is_some(),
-                held: VecDeque::new(),
-                last_present: None,
-                _keepalive: None,
-            })
-        }
-    }
-
-    /// Take ownership of the SudoVDA keepalive once the WGC session is confirmed open.
-    pub fn attach_keepalive(&mut self, keepalive: Box<dyn Send>) {
-        self._keepalive = Some(keepalive);
-    }
-
-    /// Block until a new frame arrives (cv), then drain `TryGetNextFrame` to the NEWEST queued frame
-    /// (skip stale → one-frame latency). Returns `None` on timeout (no new frame → caller repeats).
-    fn wait_and_drain(&mut self) -> Option<Direct3D11CaptureFrame> {
-        let wait_ms = if self.first_frame {
-            2000
-        } else {
-            self.timeout_ms
-        };
-        {
-            let mut g = self.signal.mtx.lock().unwrap();
-            while self.signal.available.load(Ordering::Acquire) <= self.consumed {
-                let (ng, res) = self
-                    .signal
-                    .cv
-                    .wait_timeout(g, Duration::from_millis(wait_ms))
-                    .unwrap();
-                g = ng;
-                if res.timed_out() {
-                    return None;
-                }
-            }
-        }
-        let target = self.signal.available.load(Ordering::Acquire);
-        let mut last = None;
-        while self.consumed < target {
-            if let Ok(f) = self.pool.TryGetNextFrame() {
-                last = Some(f);
-            }
-            self.consumed += 1;
-        }
-        last
-    }
-
-    unsafe fn ensure_fp16_src(&mut self) -> Result<()> {
-        if self.fp16_src.is_some() {
-            return Ok(());
-        }
-        let desc = tex_desc(
-            self.width,
-            self.height,
-            DXGI_FORMAT_R16G16B16A16_FLOAT,
-            (D3D11_BIND_RENDER_TARGET.0 | D3D11_BIND_SHADER_RESOURCE.0) as u32,
-        );
-        let mut t = None;
-        self.device
-            .CreateTexture2D(&desc, None, Some(&mut t))
-            .context("CreateTexture2D(wgc fp16 src)")?;
-        let t = t.context("fp16 src")?;
-        let mut srv = None;
-        self.device
-            .CreateShaderResourceView(&t, None, Some(&mut srv))?;
-        self.fp16_srv = Some(srv.context("fp16 srv")?);
-        self.fp16_src = Some(t);
-        Ok(())
-    }
-
-    /// Lazily allocate the HDR output texture ring (R10G10B10A2, the convert pass's render target →
-    /// NVENC input), `RENDER_TARGET`-bindable. SDR is zero-copy (encodes the WGC pool texture in
-    /// place) and uses no ring.
-    unsafe fn ensure_out_ring(
-        &mut self,
-        format: windows::Win32::Graphics::Dxgi::Common::DXGI_FORMAT,
-    ) -> Result<()> {
-        if !self.out_ring.is_empty() {
-            return Ok(());
-        }
-        let desc = tex_desc(
-            self.width,
-            self.height,
-            format,
-            D3D11_BIND_RENDER_TARGET.0 as u32,
-        );
-        for _ in 0..OUT_RING {
-            let mut t = None;
-            self.device
-                .CreateTexture2D(&desc, None, Some(&mut t))
-                .context("CreateTexture2D(wgc out ring)")?;
-            self.out_ring.push(t.context("wgc out ring tex")?);
-        }
-        Ok(())
-    }
-
-    /// Convert `input` (the OS-composited WGC pool texture: BGRA or scRGB FP16) → NVENC's native YUV
-    /// (NV12 / P010) on the video processor. Returns the YUV texture (from a ring so consecutive
-    /// encodes don't collide), or `None` to fall back to the legacy RGB paths.
-    unsafe fn convert_to_yuv(
-        &mut self,
-        input: &ID3D11Texture2D,
-        hdr: bool,
-    ) -> Option<ID3D11Texture2D> {
-        if self.vp_disabled {
-            return None;
-        }
-        if self.video_conv.is_none() || self.yuv_out.is_empty() || self.yuv_is_hdr != hdr {
-            self.video_conv = None;
-            self.yuv_out.clear();
-            self.yuv_idx = 0;
-            let vc = match VideoConverter::new(
-                &self.device,
-                &self.context,
-                self.width,
-                self.height,
-                hdr,
-            ) {
-                Ok(vc) => vc,
-                Err(e) => {
-                    tracing::warn!(error = %format!("{e:#}"),
-                        "WGC: video processor unavailable — falling back to RGB path");
-                    self.vp_disabled = true;
-                    return None;
-                }
-            };
-            let fmt = if hdr {
-                windows::Win32::Graphics::Dxgi::Common::DXGI_FORMAT_P010
-            } else {
-                windows::Win32::Graphics::Dxgi::Common::DXGI_FORMAT_NV12
-            };
-            let desc = tex_desc(
-                self.width,
-                self.height,
-                fmt,
-                D3D11_BIND_RENDER_TARGET.0 as u32,
-            );
-            for _ in 0..OUT_RING {
-                let mut t = None;
-                if self
-                    .device
-                    .CreateTexture2D(&desc, None, Some(&mut t))
-                    .is_err()
-                {
-                    tracing::warn!("WGC: CreateTexture2D(YUV) failed — falling back to RGB path");
-                    self.vp_disabled = true;
-                    self.yuv_out.clear();
-                    return None;
-                }
-                let Some(tex) = t else {
-                    self.vp_disabled = true;
-                    self.yuv_out.clear();
-                    return None;
-                };
-                self.yuv_out.push(tex);
-            }
-            self.video_conv = Some(vc);
-            self.yuv_is_hdr = hdr;
-            tracing::info!(
-                hdr,
-                "WGC: video-processor YUV path active ({})",
-                if hdr { "P010" } else { "NV12" }
-            );
-        }
-        let slot = self.yuv_idx;
-        self.yuv_idx = (self.yuv_idx + 1) % self.yuv_out.len();
-        let out = self.yuv_out[slot].clone();
-        if let Err(e) = self.video_conv.as_ref()?.convert(input, &out) {
-            tracing::warn!(error = %format!("{e:#}"),
-                "WGC: VideoProcessorBlt failed — falling back to RGB path");
-            self.vp_disabled = true;
-            self.video_conv = None;
-            self.yuv_out.clear();
-            return None;
-        }
-        Some(out)
-    }
-
-    /// `PUNKTFUNK_HDR_SHADER_P010` path: convert the OS-composited FP16 scRGB capture DIRECTLY to a
-    /// host-owned P010 texture (BT.2020 PQ, 10-bit limited range) via [`HdrP010Converter`] — two
-    /// shader passes writing the P010 planes. NVENC then takes native P010 and skips its internal
-    /// RGB→YUV CSC. Returns the next ring slot's P010 texture, or `Err` if the converter / a planar
-    /// plane RTV fails (the caller latches `p010_disabled` and falls back to the R10 path).
-    unsafe fn hdr_to_p010(&mut self, src: &ID3D11Texture2D) -> Result<ID3D11Texture2D> {
-        let slot = self.p010_idx;
-        // Lazily allocate the FP16 source (shared with the R10 path) + the P010 output ring.
-        self.ensure_fp16_src()?;
-        let fp16 = self.fp16_src.clone().context("fp16 src")?;
-        self.context.CopyResource(&fp16, src);
-        if self.p010_out.is_empty() {
-            let desc = tex_desc(
-                self.width,
-                self.height,
-                windows::Win32::Graphics::Dxgi::Common::DXGI_FORMAT_P010,
-                D3D11_BIND_RENDER_TARGET.0 as u32,
-            );
-            for _ in 0..OUT_RING {
-                let mut t = None;
-                self.device
-                    .CreateTexture2D(&desc, None, Some(&mut t))
-                    .context("CreateTexture2D(wgc p010 ring)")?;
-                self.p010_out.push(t.context("wgc p010 ring tex")?);
-            }
-        }
-        self.p010_idx = (self.p010_idx + 1) % self.p010_out.len();
-        let out = self.p010_out[slot].clone();
-        if self.hdr_p010_conv.is_none() {
-            self.hdr_p010_conv = Some(HdrP010Converter::new(&self.device)?);
-        }
-        let srv = self.fp16_srv.clone().context("fp16 srv")?;
-        self.hdr_p010_conv.as_ref().unwrap().convert(
-            &self.device,
-            &self.context,
-            &srv,
-            &out,
-            self.width,
-            self.height,
-        )?;
-        Ok(out)
-    }
-
-    fn process_frame(&mut self, frame: Direct3D11CaptureFrame) -> Result<CapturedFrame> {
-        // SAFETY: runs on the capturer's single owning thread. `frame` is a live
-        // `Direct3D11CaptureFrame` from `self.pool`; `frame.Surface().cast::<IDirect3DDxgiInterfaceAccess
-        // >().GetInterface()` yields the frame's backing `ID3D11Texture2D`, which belongs to
-        // `self.device` (the pool was created on it via `CreateDirect3D11DeviceFromDXGIDevice`). Every
-        // helper called here — `hdr_to_p010`, `convert_to_yuv`, `ensure_fp16_src`, `ensure_out_ring`,
-        // `HdrConverter::convert`, `CopyResource`, `CreateRenderTargetView` — operates on
-        // `self.device`/`self.context` and that same-device texture, so all resources share one device.
-        // The frame is held in `self.held` until its async GPU read completes for the zero-copy paths.
-        // Single-threaded immediate-context use; borrowed textures/SRVs/RTVs outlive each synchronous call.
-        unsafe {
-            let surface = frame.Surface().context("frame Surface")?;
-            let access: IDirect3DDxgiInterfaceAccess = surface
-                .cast()
-                .context("surface as IDirect3DDxgiInterfaceAccess")?;
-            let src: ID3D11Texture2D = access
-                .GetInterface()
-                .context("GetInterface ID3D11Texture2D")?;
-
-            // GATED P010-shader path (`PUNKTFUNK_HDR_SHADER_P010`): for HDR, emit P010 (BT.2020 PQ
-            // 10-bit limited range) DIRECTLY from our shader so NVENC takes native P010 and skips its
-            // SM-side RGB→YUV CSC. Runs BEFORE the R10 + VideoProcessor path. A converter/plane-RTV
-            // failure latches `p010_disabled` → we fall through to the unchanged R10 path for the rest
-            // of the session. Default OFF → none of this executes and behaviour is byte-for-byte as
-            // today.
-            if self.hdr && !self.p010_disabled && hdr_shader_p010_enabled() {
-                match self.hdr_to_p010(&src) {
-                    Ok(p010) => {
-                        // The P010 output is host-owned (the ring), and the FP16 CopyResource read
-                        // `src` synchronously on the immediate context before the shader passes — so we
-                        // do NOT need to hold `frame` past here (unlike the SDR/R10 in-place paths).
-                        // Dropping it returns the pool buffer to WGC immediately.
-                        drop(frame);
-                        self.last_present = Some((p010.clone(), PixelFormat::P010));
-                        return Ok(self.d3d11_frame(p010, PixelFormat::P010));
-                    }
-                    Err(e) => {
-                        tracing::warn!(error = %format!("{e:#}"),
-                            "WGC: HDR P010 shader path failed — disabling it, falling back to R10");
-                        self.p010_disabled = true;
-                        self.hdr_p010_conv = None;
-                        self.p010_out.clear();
-                    }
-                }
-            }
-
-            // Preferred path: convert the OS-composited capture (cursor already in it) DIRECTLY to
-            // NVENC's native YUV on the video processor — no CopyResource, no cursor draw, and NVENC
-            // skips its internal RGB→YUV (the contended 3D step). WGC's multi-buffer pool + held set
-            // means reading the pool texture directly does NOT serialize (unlike DDA's single-frame
-            // model). The frame is held until the async Blt finishes. (HDR: the video processor can't
-            // ingest FP16 scRGB, so the Blt fails and we fall back to the R10 path below; the
-            // `PUNKTFUNK_HDR_SHADER_P010` branch above is the off-the-SM HDR path.)
-            if let Some(yuv) = self.convert_to_yuv(&src, self.hdr) {
-                let fmt = if self.hdr {
-                    PixelFormat::P010
-                } else {
-                    PixelFormat::Nv12
-                };
-                self.last_present = Some((yuv.clone(), fmt));
-                let out = self.d3d11_frame(yuv, fmt);
-                self.held.push_back(frame);
-                while self.held.len() > HELD_FRAMES {
-                    self.held.pop_front();
-                }
-                return Ok(out);
-            }
-
-            // --- fallback (video processor unavailable) ---
-            if self.hdr {
-                // Next ring slot — the in-flight encode reads the slot we handed out last time, so
-                // this capture must land in a different one (see `out_ring`).
-                let slot = self.ring_idx;
-                self.ring_idx = (self.ring_idx + 1) % OUT_RING;
-                // FP16 (cursor already composited by the OS) → BT.2020 PQ 10-bit for NVENC.
-                self.ensure_fp16_src()?;
-                let fp16 = self.fp16_src.clone().context("fp16 src")?;
-                self.context.CopyResource(&fp16, &src);
-                self.ensure_out_ring(DXGI_FORMAT_R10G10B10A2_UNORM)?;
-                let out = self.out_ring[slot].clone();
-                if self.hdr_conv.is_none() {
-                    self.hdr_conv = Some(HdrConverter::new(&self.device)?);
-                }
-                let srv = self.fp16_srv.clone().context("fp16 srv")?;
-                let mut rtv: Option<ID3D11RenderTargetView> = None;
-                self.device
-                    .CreateRenderTargetView(&out, None, Some(&mut rtv))?;
-                let rtv = rtv.context("hdr10 rtv")?;
-                self.hdr_conv.as_ref().unwrap().convert(
-                    &self.context,
-                    &srv,
-                    &rtv,
-                    self.width,
-                    self.height,
-                );
-                self.last_present = Some((out.clone(), PixelFormat::Rgb10a2));
-                Ok(self.d3d11_frame(out, PixelFormat::Rgb10a2))
-            } else {
-                // SDR ZERO-COPY: hand NVENC the WGC pool texture DIRECTLY — no `CopyResource`. The
-                // per-frame copy otherwise queues on the graphics engine behind a GPU-saturating game
-                // and stalls `lock_bitstream` ~20 ms (NVENC sits idle waiting for its input). Encoding
-                // the pool texture in place removes that graphics-queue dependency (Apollo's model).
-                // We must keep the frame alive until its async encode finishes, so retain the last
-                // `HELD_FRAMES`; the pool has spare buffers so the producer never starves.
-                self.last_present = Some((src.clone(), PixelFormat::Bgra));
-                let out = self.d3d11_frame(src, PixelFormat::Bgra);
-                self.held.push_back(frame);
-                while self.held.len() > HELD_FRAMES {
-                    self.held.pop_front();
-                }
-                Ok(out)
-            }
-        }
-    }
-
-    fn d3d11_frame(&self, texture: ID3D11Texture2D, format: PixelFormat) -> CapturedFrame {
-        CapturedFrame {
-            width: self.width,
-            height: self.height,
-            pts_ns: now_ns(),
-            format,
-            payload: FramePayload::D3d11(D3d11Frame {
-                texture,
-                device: self.device.clone(),
-            }),
-        }
-    }
-}
-
-impl Capturer for WgcCapturer {
-    fn hdr_meta(&self) -> Option<punktfunk_core::quic::HdrMeta> {
-        self.hdr_meta
-    }
-
-    fn next_frame(&mut self) -> Result<CapturedFrame> {
-        let overall = Instant::now() + Duration::from_secs(20);
-        loop {
-            if let Some(frame) = self.wait_and_drain() {
-                self.first_frame = false;
-                return self.process_frame(frame);
-            }
-            // No new frame within the wait — repeat the last presented frame (static desktop).
-            if let Some((tex, fmt)) = &self.last_present {
-                return Ok(self.d3d11_frame(tex.clone(), *fmt));
-            }
-            if Instant::now() > overall {
-                bail!("no WGC frame within 20s (SudoVDA monitor not lit / no capture access?)");
-            }
-        }
-    }
-
-    fn try_latest(&mut self) -> Result<Option<CapturedFrame>> {
-        let target = self.signal.available.load(Ordering::Acquire);
-        if target <= self.consumed {
-            return Ok(None);
-        }
-        let mut last = None;
-        while self.consumed < target {
-            if let Ok(f) = self.pool.TryGetNextFrame() {
-                last = Some(f);
-            }
-            self.consumed += 1;
-        }
-        match last {
-            Some(frame) => self.process_frame(frame).map(Some),
-            None => Ok(None),
-        }
-    }
-    // set_active: the trait default (no-op) is correct — WGC keeps its session running across the
-    // active/idle gate (cheap; the frame pool just recycles), like the DDA duplication.
-}
-
-impl Drop for WgcCapturer {
-    fn drop(&mut self) {
-        let _ = self.session.Close();
-        let _ = self.pool.Close();
-        // _keepalive drops after, REMOVEing the SudoVDA monitor.
-    }
-}
-
-fn tex_desc(
-    width: u32,
-    height: u32,
-    format: windows::Win32::Graphics::Dxgi::Common::DXGI_FORMAT,
-    bind: u32,
-) -> D3D11_TEXTURE2D_DESC {
-    D3D11_TEXTURE2D_DESC {
-        Width: width,
-        Height: height,
-        MipLevels: 1,
-        ArraySize: 1,
-        Format: format,
-        SampleDesc: DXGI_SAMPLE_DESC {
-            Count: 1,
-            Quality: 0,
-        },
-        Usage: D3D11_USAGE_DEFAULT,
-        BindFlags: bind,
-        CPUAccessFlags: 0,
-        MiscFlags: 0,
-    }
-}
-
-fn now_ns() -> u64 {
-    std::time::SystemTime::now()
-        .duration_since(std::time::UNIX_EPOCH)
-        .map(|d| d.as_nanos() as u64)
-        .unwrap_or(0)
-}

crates/punktfunk-host/src/capture/windows/wgc_relay.rs

@@ -1,484 +0,0 @@
-//! Host-side WGC helper relay (Windows two-process secure-desktop design,
-//! design/archive/windows-secure-desktop.md — step 4).
-//!
-//! WGC won't activate under the SYSTEM account, so the SYSTEM host can't capture the normal desktop
-//! itself. Instead it spawns `punktfunk-host wgc-helper` in the **interactive user session** (so WGC works)
-//! via `CreateProcessAsUserW`, with the helper's **stdout** redirected to an anonymous pipe the host
-//! reads. The helper ships framed Annex-B access units; this module parses them back into AUs the
-//! host relays onto the live QUIC session (same `EncodedFrame` flow, just sourced over a pipe instead
-//! of a local encoder). A second pipe carries a tiny **control** channel to the helper (stdin: force
-//! keyframe), and the helper's **stderr** is forwarded line-by-line into host tracing so its logs are
-//! visible from the SYSTEM host's console.
-//!
-//! Wire framing (must match `wgc_helper::write_au`): per AU
-//! `[u32 magic "PFAU" LE][u32 len LE][u64 pts_ns LE][u8 keyframe][len bytes data]`.
-
-// Every `unsafe` block in this file carries a `// SAFETY:` proof; enforce it (unsafe-proof program).
-#![deny(clippy::undocumented_unsafe_blocks)]
-
-use crate::capture::dxgi::WinCaptureTarget;
-use anyhow::{bail, Context, Result};
-use std::io::{BufRead, BufReader, Read};
-use std::sync::mpsc::{Receiver, SyncSender};
-use std::sync::Mutex;
-use windows::core::PWSTR;
-use windows::Win32::Foundation::SetHandleInformation;
-use windows::Win32::Foundation::{CloseHandle, HANDLE};
-use windows::Win32::Foundation::{HANDLE_FLAGS, HANDLE_FLAG_INHERIT};
-use windows::Win32::Security::{
-    DuplicateTokenEx, SecurityImpersonation, TokenPrimary, SECURITY_ATTRIBUTES, TOKEN_ALL_ACCESS,
-};
-use windows::Win32::System::Environment::{CreateEnvironmentBlock, DestroyEnvironmentBlock};
-use windows::Win32::System::Pipes::CreatePipe;
-use windows::Win32::System::RemoteDesktop::{WTSGetActiveConsoleSessionId, WTSQueryUserToken};
-use windows::Win32::System::Threading::{
-    CreateProcessAsUserW, TerminateProcess, CREATE_NO_WINDOW, CREATE_UNICODE_ENVIRONMENT,
-    PROCESS_INFORMATION, STARTF_USESTDHANDLES, STARTUPINFOW,
-};
-
-/// Must match [`crate::wgc_helper`]'s `AU_MAGIC` ("PFAU").
-const AU_MAGIC: u32 = 0x5046_4155;
-
-/// One access unit relayed from the helper, in the helper's (= the host's, same machine) monotonic
-/// clock — `pts_ns` is directly comparable to the host's `now_ns()`.
-pub struct RelayAu {
-    pub data: Vec<u8>,
-    pub pts_ns: u64,
-    pub keyframe: bool,
-}
-
-/// A running USER-session WGC helper whose AUs the SYSTEM host relays. Drop kills the child + closes
-/// the pipes; the reader threads then end on the broken pipe.
-pub struct HelperRelay {
-    proc: HANDLE,
-    thread: HANDLE,
-    /// Host write end of the helper's stdin — control commands (force keyframe). Mutex so the relay
-    /// can be shared while the encode thread requests keyframes.
-    stdin_w: Mutex<HANDLE>,
-    /// Parsed AUs from the helper's stdout reader thread.
-    rx: Receiver<RelayAu>,
-}
-
-// SAFETY: every field is itself `Send`: the `proc`/`thread` `HANDLE`s are process-global kernel
-// handle values (plain integers valid from any thread, owned for the relay's lifetime and closed once
-// on Drop), `stdin_w` is a `Mutex<HANDLE>`, and `rx` is an mpsc `Receiver<RelayAu>` (which is `Send`).
-// The relay is moved to one thread and owned there, so transferring it across threads is sound.
-unsafe impl Send for HelperRelay {}
-// NOTE: `HelperRelay` is deliberately NOT `Sync`. Its `rx: Receiver<RelayAu>` is `!Sync` (std mpsc
-// is single-consumer), and the relay is only ever a single-owner local in the punktfunk1 two-process
-// mux loop — never shared by `&` across threads — so `Sync` is neither sound nor needed. (A prior
-// `unsafe impl Sync` here asserted more than the fields support; removed.)
-
-/// Control byte on the helper's stdin: force the next encoded frame to be an IDR (client decode
-/// recovery). Mirrors `enc.request_keyframe()` in the single-process path.
-const CTL_KEYFRAME: u8 = 0x01;
-
-impl HelperRelay {
-    /// Spawn the helper in the interactive user session and start relaying its AUs. `target` is the
-    /// SudoVDA output the host already created (captured by GDI name only — the helper never touches
-    /// display topology). `(w, h, hz)` is the negotiated mode; `bitrate_kbps` the negotiated bitrate.
-    pub fn spawn(
-        target: &WinCaptureTarget,
-        mode: (u32, u32, u32),
-        bitrate_kbps: u32,
-        bit_depth: u8,
-    ) -> Result<HelperRelay> {
-        let exe = std::env::current_exe().context("current_exe for helper spawn")?;
-        let exe = exe.to_string_lossy().into_owned();
-        let (w, h, hz) = mode;
-        // CreateProcessAsUserW takes a single mutable command line (argv[0] = exe).
-        let cmdline = format!(
-            "\"{exe}\" wgc-helper --gdi \"{}\" --target-id {} --mode {w}x{h}x{hz} --bitrate {bitrate_kbps} --bit-depth {bit_depth}",
-            target.gdi_name, target.target_id
-        );
-        tracing::info!(cmd = %cmdline, "spawning WGC helper in user session");
-
-        // SAFETY: `spawn_inner` is an `unsafe fn` only because it drives raw Win32 token/pipe/process
-        // FFI; it imposes no caller-side memory precondition beyond valid arguments. `cmdline` is a live
-        // `&str` borrowed for the synchronous call and `(w, h, hz)` are plain `u32`s. It validates its
-        // own runtime requirements (active console session, SYSTEM token) and returns `Err` otherwise.
-        unsafe { spawn_inner(&cmdline, w, h, hz) }
-    }
-
-    /// Receive the next relayed AU. Distinguishes a `Timeout` (helper slow/stalled — keep waiting)
-    /// from `Disconnected` (helper exited → its stdout closed → reader thread ended → channel
-    /// dropped), which returns *immediately* and means the relay must stop, not spin.
-    pub fn recv_timeout(
-        &self,
-        dur: std::time::Duration,
-    ) -> Result<RelayAu, std::sync::mpsc::RecvTimeoutError> {
-        self.rx.recv_timeout(dur)
-    }
-
-    /// Non-blocking receive — used to drain stale buffered AUs (encoded while the secure desktop was
-    /// the live source) before resuming the relay. `Ok` while AUs remain, `Err` once empty.
-    pub fn try_recv(&self) -> Result<RelayAu, std::sync::mpsc::TryRecvError> {
-        self.rx.try_recv()
-    }
-
-    /// Ask the helper's encoder for an IDR on the next frame (client decode recovery). Best-effort:
-    /// a write failure means the helper is gone — the caller's recv loop will see the disconnect.
-    pub fn request_keyframe(&self) {
-        let h = self.stdin_w.lock().unwrap();
-        let mut written = 0u32;
-        // SAFETY: `*h` is the host's write end of the helper's stdin pipe — a live `HANDLE` owned by
-        // this `HelperRelay` (held under the `stdin_w` Mutex, locked here), closed only in Drop.
-        // `WriteFile` reads the 1-byte `&[CTL_KEYFRAME]` buffer and writes the byte count into
-        // `written`; both are live locals that outlive the synchronous call. A failure (helper gone) is
-        // discarded as documented.
-        unsafe {
-            let _ = windows::Win32::Storage::FileSystem::WriteFile(
-                *h,
-                Some(&[CTL_KEYFRAME]),
-                Some(&mut written),
-                None,
-            );
-        }
-    }
-}
-
-impl Drop for HelperRelay {
-    fn drop(&mut self) {
-        // SAFETY: `self.proc`/`self.thread` are the child process/thread `HANDLE`s from
-        // `CreateProcessAsUserW`, and `stdin_w` is the host's pipe write end — all owned by this
-        // `HelperRelay` and closed exactly once here in Drop (no double-close). `TerminateProcess` and
-        // the three `CloseHandle`s are FFI calls taking those handles by value, borrowing no Rust memory.
-        unsafe {
-            // Terminate the child first so its WGC capture + NVENC session tear down, then close our
-            // handles (the reader threads end on the resulting broken pipe).
-            let _ = TerminateProcess(self.proc, 1);
-            let _ = CloseHandle(*self.stdin_w.lock().unwrap());
-            let _ = CloseHandle(self.proc);
-            let _ = CloseHandle(self.thread);
-        }
-        tracing::info!("WGC helper relay torn down");
-    }
-}
-
-/// Inheritable anonymous pipe (read, write). The caller marks whichever end the host keeps as
-/// non-inheritable so the child only inherits its own end.
-unsafe fn make_pipe() -> Result<(HANDLE, HANDLE)> {
-    let mut read = HANDLE::default();
-    let mut write = HANDLE::default();
-    let sa = SECURITY_ATTRIBUTES {
-        nLength: std::mem::size_of::<SECURITY_ATTRIBUTES>() as u32,
-        lpSecurityDescriptor: std::ptr::null_mut(),
-        bInheritHandle: true.into(),
-    };
-    CreatePipe(&mut read, &mut write, Some(&sa), 0).context("CreatePipe")?;
-    Ok((read, write))
-}
-
-/// Mark a handle non-inheritable (the host keeps it; the child must not get a copy).
-unsafe fn no_inherit(h: HANDLE) {
-    let _ = SetHandleInformation(h, HANDLE_FLAG_INHERIT.0, HANDLE_FLAGS(0));
-}
-
-/// Build a child environment block: the target session's block (so DLL/PATH/SystemRoot resolve) with
-/// this process's `PUNKTFUNK_*` vars overlaid, so the child runs with the SAME settings this process
-/// has (`PUNKTFUNK_ENCODER=nvenc`, `PUNKTFUNK_ZEROCOPY`, …) instead of the target shell's. Returns a
-/// UTF-16, double-null-terminated block suitable for `CREATE_UNICODE_ENVIRONMENT`. Shared by the WGC
-/// helper spawn (here) and the Windows service launching the host into the active session.
-pub(crate) unsafe fn merged_env_block(user_block: *const u16) -> Vec<u16> {
-    // Parse the user block ("VAR=VALUE\0" … "\0") into entries.
-    let mut entries: Vec<String> = Vec::new();
-    if !user_block.is_null() {
-        let mut p = user_block;
-        loop {
-            let mut len = 0isize;
-            while *p.offset(len) != 0 {
-                len += 1;
-            }
-            if len == 0 {
-                break; // the trailing empty string = end of block
-            }
-            let slice = std::slice::from_raw_parts(p, len as usize);
-            entries.push(String::from_utf16_lossy(slice));
-            p = p.offset(len + 1);
-        }
-    }
-    // Overlay "our" settings — PUNKTFUNK_* and RUST_LOG — dropping whatever the target block had.
-    let is_ours = |k: &str| k.starts_with("PUNKTFUNK_") || k == "RUST_LOG";
-    entries.retain(|e| !is_ours(e.split('=').next().unwrap_or("")));
-    for (k, v) in std::env::vars().filter(|(k, _)| is_ours(k)) {
-        entries.push(format!("{k}={v}"));
-    }
-    // Serialize back to a UTF-16 double-null-terminated block.
-    let mut block: Vec<u16> = Vec::new();
-    for e in entries {
-        block.extend(e.encode_utf16());
-        block.push(0);
-    }
-    block.push(0);
-    block
-}
-
-unsafe fn spawn_inner(cmdline: &str, w: u32, h: u32, hz: u32) -> Result<HelperRelay> {
-    // The user token of the active console session (requires the host to be SYSTEM).
-    let session = WTSGetActiveConsoleSessionId();
-    if session == 0xFFFF_FFFF {
-        bail!("no active console session (WTSGetActiveConsoleSessionId)");
-    }
-    let mut user_token = HANDLE::default();
-    WTSQueryUserToken(session, &mut user_token)
-        .context("WTSQueryUserToken (host must run as SYSTEM)")?;
-
-    // A primary token for CreateProcessAsUserW.
-    let mut primary = HANDLE::default();
-    let dup = DuplicateTokenEx(
-        user_token,
-        TOKEN_ALL_ACCESS,
-        None,
-        SecurityImpersonation,
-        TokenPrimary,
-        &mut primary,
-    );
-    let _ = CloseHandle(user_token);
-    dup.context("DuplicateTokenEx(TokenPrimary)")?;
-
-    // The user's environment block (PATH, USERPROFILE, SystemRoot → DLL resolution), MERGED with the
-    // host's PUNKTFUNK_* vars. CreateProcessAsUserW would otherwise give the helper the *user's* env
-    // only, dropping PUNKTFUNK_ENCODER=nvenc / PUNKTFUNK_ZEROCOPY/… that the host runs with — so the
-    // helper would fall back to the software (H.264-only) encoder. We parse the user block, strip any
-    // PUNKTFUNK_* it has, append the host's, and pass the merged block.
-    let mut env_block: *mut core::ffi::c_void = std::ptr::null_mut();
-    let _ = CreateEnvironmentBlock(&mut env_block, Some(primary), false);
-    let merged_env = merged_env_block(env_block as *const u16);
-    if !env_block.is_null() {
-        let _ = DestroyEnvironmentBlock(env_block);
-    }
-
-    // Three pipes: stdout (helper→host AUs), stdin (host→helper control), stderr (helper→host logs).
-    let (out_r, out_w) = make_pipe().context("stdout pipe")?;
-    let (in_r, in_w) = make_pipe().context("stdin pipe")?;
-    let (err_r, err_w) = make_pipe().context("stderr pipe")?;
-    // The host keeps out_r / in_w / err_r — none inheritable; the child inherits out_w/in_r/err_w.
-    no_inherit(out_r);
-    no_inherit(in_w);
-    no_inherit(err_r);
-
-    let mut si = STARTUPINFOW {
-        cb: std::mem::size_of::<STARTUPINFOW>() as u32,
-        dwFlags: STARTF_USESTDHANDLES,
-        hStdInput: in_r,
-        hStdOutput: out_w,
-        hStdError: err_w,
-        ..Default::default()
-    };
-    // WGC needs the interactive desktop.
-    let mut desktop: Vec<u16> = "winsta0\\default\0".encode_utf16().collect();
-    si.lpDesktop = PWSTR(desktop.as_mut_ptr());
-
-    let mut cmd: Vec<u16> = cmdline.encode_utf16().chain(std::iter::once(0)).collect();
-    let mut pi = PROCESS_INFORMATION::default();
-
-    let created = CreateProcessAsUserW(
-        Some(primary),
-        None,
-        Some(PWSTR(cmd.as_mut_ptr())),
-        None,
-        None,
-        true, // inherit handles (the child's std ends)
-        CREATE_UNICODE_ENVIRONMENT | CREATE_NO_WINDOW,
-        Some(merged_env.as_ptr() as *const core::ffi::c_void),
-        None,
-        &si,
-        &mut pi,
-    );
-
-    // Clean up regardless of outcome: the child now owns its inherited ends; close our copies.
-    let _ = CloseHandle(out_w);
-    let _ = CloseHandle(in_r);
-    let _ = CloseHandle(err_w);
-    let _ = CloseHandle(primary);
-
-    if let Err(e) = created {
-        let _ = CloseHandle(out_r);
-        let _ = CloseHandle(in_w);
-        let _ = CloseHandle(err_r);
-        return Err(e).context("CreateProcessAsUserW(wgc-helper)");
-    }
-    tracing::info!(pid = pi.dwProcessId, mode = %format!("{w}x{h}@{hz}"), "WGC helper spawned");
-
-    // The helper does the WGC capture + NVENC encode, but it runs under the user's UAC-FILTERED token
-    // (no SE_INC_BASE_PRIORITY), so it can't raise its OWN GPU scheduling-priority class — under a
-    // GPU-saturating game NVENC then gets starved (the "240→40 fps in-game collapse"). The SYSTEM host
-    // holds the privilege, so stamp the HIGH GPU priority class onto the child here, right after spawn
-    // (the process-level class applies to the GPU contexts the helper creates afterwards).
-    crate::capture::dxgi::set_child_gpu_priority_class(pi.hProcess);
-
-    // stderr → host tracing, line by line.
-    let err_handle = HandleReader(err_r);
-    std::thread::Builder::new()
-        .name("wgc-helper-log".into())
-        .spawn(move || {
-            let r = BufReader::new(err_handle);
-            for line in r.lines() {
-                match line {
-                    Ok(l) if !l.trim().is_empty() => tracing::info!(target: "wgc_helper", "{l}"),
-                    Ok(_) => {}
-                    Err(_) => break,
-                }
-            }
-        })
-        .ok();
-
-    // stdout → parsed AUs. Bounded so a stalled relay applies backpressure (the pipe then fills and
-    // the helper blocks on write — the same backpressure the single-process channel gives).
-    let (tx, rx) = std::sync::mpsc::sync_channel::<RelayAu>(3);
-    let out_handle = HandleReader(out_r);
-    std::thread::Builder::new()
-        .name("wgc-helper-au".into())
-        .spawn(move || au_reader(out_handle, tx))
-        .ok();
-
-    Ok(HelperRelay {
-        proc: pi.hProcess,
-        thread: pi.hThread,
-        stdin_w: Mutex::new(in_w),
-        rx,
-    })
-}
-
-/// Parse the AU framing off the helper's stdout and forward each AU. Ends (returns) when the pipe
-/// breaks (helper exit) or the channel's receiver is dropped (relay torn down).
-fn au_reader(mut r: HandleReader, tx: SyncSender<RelayAu>) {
-    loop {
-        let mut hdr = [0u8; 4 + 4 + 8 + 1];
-        if r.read_exact(&mut hdr).is_err() {
-            break;
-        }
-        let magic = u32::from_le_bytes([hdr[0], hdr[1], hdr[2], hdr[3]]);
-        if magic != AU_MAGIC {
-            tracing::error!(
-                magic = format!("{magic:#x}"),
-                "WGC helper AU stream desync — aborting relay"
-            );
-            break;
-        }
-        let len = u32::from_le_bytes([hdr[4], hdr[5], hdr[6], hdr[7]]) as usize;
-        let pts_ns = u64::from_le_bytes([
-            hdr[8], hdr[9], hdr[10], hdr[11], hdr[12], hdr[13], hdr[14], hdr[15],
-        ]);
-        let keyframe = hdr[16] != 0;
-        // Bound the allocation — a corrupt length must not OOM the host. 64 MiB is far above any real
-        // AU (a 5K keyframe is a few MB).
-        if len > 64 * 1024 * 1024 {
-            tracing::error!(len, "WGC helper AU length implausible — aborting relay");
-            break;
-        }
-        let mut data = vec![0u8; len];
-        if r.read_exact(&mut data).is_err() {
-            break;
-        }
-        if tx
-            .send(RelayAu {
-                data,
-                pts_ns,
-                keyframe,
-            })
-            .is_err()
-        {
-            break; // relay dropped
-        }
-    }
-}
-
-/// Minimal `Read` over a Win32 pipe HANDLE (the windows crate doesn't impl `Read` on HANDLE).
-struct HandleReader(HANDLE);
-// SAFETY: `HandleReader` owns a single pipe `HANDLE` (a process-global kernel handle value, valid from
-// any thread). It is moved into the dedicated reader thread and used only there (and closed once on
-// Drop), never shared — so transferring ownership across threads is sound.
-unsafe impl Send for HandleReader {}
-impl Read for HandleReader {
-    fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
-        let mut read = 0u32;
-        // SAFETY: `self.0` is the live read end of an anonymous pipe owned by this `HandleReader`
-        // (closed only in Drop). `ReadFile` fills the caller-provided `buf` (writing at most `buf.len()`
-        // bytes) and stores the count in `read`; both outlive the synchronous call. A broken pipe
-        // surfaces as `Err` and is mapped to EOF below.
-        let ok = unsafe {
-            windows::Win32::Storage::FileSystem::ReadFile(self.0, Some(buf), Some(&mut read), None)
-        };
-        match ok {
-            Ok(()) => Ok(read as usize),
-            // A broken pipe (helper exited) reads as ERROR_BROKEN_PIPE → report EOF (0).
-            Err(_) => Ok(0),
-        }
-    }
-}
-impl Drop for HandleReader {
-    fn drop(&mut self) {
-        // SAFETY: `self.0` is the pipe `HANDLE` this `HandleReader` owns; `CloseHandle` (an FFI call
-        // taking the handle by value) is invoked exactly once here in Drop, so there is no double-close.
-        unsafe {
-            let _ = CloseHandle(self.0);
-        }
-    }
-}
-
-/// Is this process running as the LOCAL SYSTEM account? Used to decide whether the two-process
-/// secure-desktop path applies (only SYSTEM can `WTSQueryUserToken` + capture the Winlogon desktop).
-pub fn running_as_system() -> bool {
-    use windows::Win32::Security::{GetTokenInformation, TokenUser, TOKEN_QUERY, TOKEN_USER};
-    use windows::Win32::System::Threading::{GetCurrentProcess, OpenProcessToken};
-    // SAFETY: `OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &mut token)` opens the current-process
-    // token (the pseudo-handle is always valid) into `token`, which is closed once before each return.
-    // The first `GetTokenInformation` (null buffer) queries the required `len`; `buf` is then a
-    // `Vec<u8>` of exactly `len` bytes and the second call fills it, so `&*(buf.as_ptr() as *const
-    // TOKEN_USER)` reads a `TOKEN_USER` the kernel just wrote into a sufficiently-sized buffer (the
-    // variable-length SID it points at also lies within `buf`, which outlives the borrow).
-    // `is_local_system_sid` is this module's `unsafe fn`, given that in-buffer `PSID`. Safe on any thread.
-    unsafe {
-        let mut token = HANDLE::default();
-        if OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &mut token).is_err() {
-            return false;
-        }
-        let mut len = 0u32;
-        let _ = GetTokenInformation(token, TokenUser, None, 0, &mut len);
-        if len == 0 {
-            let _ = CloseHandle(token);
-            return false;
-        }
-        let mut buf = vec![0u8; len as usize];
-        let ok = GetTokenInformation(
-            token,
-            TokenUser,
-            Some(buf.as_mut_ptr() as *mut _),
-            len,
-            &mut len,
-        )
-        .is_ok();
-        let _ = CloseHandle(token);
-        if !ok {
-            return false;
-        }
-        let tu = &*(buf.as_ptr() as *const TOKEN_USER);
-        // The well-known LocalSystem SID is S-1-5-18.
-        is_local_system_sid(tu.User.Sid)
-    }
-}
-
-/// True iff `sid` is S-1-5-18 (LocalSystem).
-unsafe fn is_local_system_sid(sid: windows::Win32::Security::PSID) -> bool {
-    use windows::Win32::Security::{
-        GetSidIdentifierAuthority, GetSidSubAuthority, GetSidSubAuthorityCount, IsValidSid,
-    };
-    if !IsValidSid(sid).as_bool() {
-        return false;
-    }
-    let auth = GetSidIdentifierAuthority(sid);
-    if auth.is_null() {
-        return false;
-    }
-    // NT Authority = {0,0,0,0,0,5}.
-    let a = (*auth).Value;
-    if a != [0, 0, 0, 0, 0, 5] {
-        return false;
-    }
-    let count = *GetSidSubAuthorityCount(sid);
-    if count != 1 {
-        return false;
-    }
-    *GetSidSubAuthority(sid, 0) == 18 // SECURITY_LOCAL_SYSTEM_RID
-}

crates/punktfunk-host/src/config.rs

@@ -6,8 +6,8 @@
 //!
 //! **Goal-1 stages 1–2** (`design/windows-host-rewrite.md` §2.2): stage 1 stood this up; stage 2 migrated the
 //! genuinely-constant operator/dispatch knobs onto it (the dispatch-disagreement bug class: `idd_push`,
-//! `capture_backend`, `encoder_pref`, `render_adapter`, `no_wgc`, the vdisplay backend select — plus the
+//! `encoder_pref`, `render_adapter`, the vdisplay backend select — plus the plan-named
-//! plan-named `secure_dda`/`idd_depth`/`zerocopy`/`ten_bit`/`four_four_four` and the multi-site `perf`/`compositor`/
+//! `idd_depth`/`zerocopy`/`ten_bit`/`four_four_four` and the multi-site `perf`/`compositor`/
 //! `video_source`/`gamepad`). `SessionPlan` (stage 3) consumes it as the single owner of the
 //! capture/topology/encoder decision.
 //!
@@ -36,27 +36,17 @@ use std::sync::OnceLock;
 /// derived `Debug` impl, so the parser can stay a single platform-neutral function.
 #[derive(Debug, Clone, Default)]
 pub struct HostConfig {
-    /// `PUNKTFUNK_IDD_PUSH` — capture from the pf-vdisplay driver's shared ring (in-process Session-0
+    /// `PUNKTFUNK_IDD_PUSH` — IDD direct-push monitor mode (the per-session monitor + ring recreate and
-    /// capture; no WGC helper). **Value-aware** (`0`/`false`/`no`/`off`/empty ⇒ off, else on); unset ⇒ off.
+    /// the discrete-render-GPU pin in [`crate::vdisplay::manager`]). IDD-push is the sole Windows capture
-    /// The installer's default `host.env` sets it on, so a fresh install runs the validated IDD-push path
+    /// path (DXGI Desktop Duplication and the WGC relay were removed), so this should stay on — the
-    /// (it falls back to DDA if the driver can't attach — see [`crate::capture`]). NOT a bare presence flag
+    /// installer's `host.env` sets it. **Value-aware** (`0`/`false`/`no`/`off`/empty ⇒ off, else on);
-    /// (so an operator can turn it OFF in `host.env` with `=0`, which a `var_os` presence check can't).
+    /// unset ⇒ off. NOT a bare presence flag (so an operator can turn it OFF with `=0`).
     pub idd_push: bool,
     /// `PUNKTFUNK_ENCODER` — explicit encoder-backend override (lowercased; empty = auto-detect by GPU vendor).
     pub encoder_pref: String,
-    /// `PUNKTFUNK_NO_HELPER` — never spawn the user-session WGC helper.
-    pub no_helper: bool,
-    /// `PUNKTFUNK_FORCE_HELPER` — force the WGC helper even when not running as SYSTEM.
-    pub force_helper: bool,
-    /// `PUNKTFUNK_NO_WGC` — force the pure single-process DDA path (skip WGC and the two-process relay).
-    pub no_wgc: bool,
-    /// `PUNKTFUNK_CAPTURE` — explicit Windows capture-backend override (lowercased; `dda`/`dxgi` vs the WGC default).
-    pub capture_backend: String,
     /// `PUNKTFUNK_RENDER_ADAPTER` — discrete render-GPU pin by description substring (`Some` even when empty:
     /// the empty string still counts as "set" for the presence checks, and the value reader filters it).
     pub render_adapter: Option<String>,
-    /// `PUNKTFUNK_SECURE_DDA` — enable the experimental DDA-on-secure-desktop (Winlogon/UAC) mux leg.
-    pub secure_dda: bool,
     /// `PUNKTFUNK_IDD_DEPTH` — IDD-push pipeline depth override (default 2; the call site clamps to its `OUT_RING`).
     pub idd_depth: usize,
     /// `PUNKTFUNK_ZEROCOPY` — opt into the Windows D3D11 zero-copy encode path (presence semantics; see module docs).
@@ -103,14 +93,7 @@ impl HostConfig {
             encoder_pref: std::env::var("PUNKTFUNK_ENCODER")
                 .unwrap_or_default()
                 .to_ascii_lowercase(),
-            no_helper: flag("PUNKTFUNK_NO_HELPER"),
-            force_helper: flag("PUNKTFUNK_FORCE_HELPER"),
-            no_wgc: flag("PUNKTFUNK_NO_WGC"),
-            capture_backend: std::env::var("PUNKTFUNK_CAPTURE")
-                .unwrap_or_default()
-                .to_ascii_lowercase(),
             render_adapter: val("PUNKTFUNK_RENDER_ADAPTER"),
-            secure_dda: flag("PUNKTFUNK_SECURE_DDA"),
             idd_depth: val("PUNKTFUNK_IDD_DEPTH")
                 .and_then(|s| s.parse::<usize>().ok())
                 .unwrap_or(2),

crates/punktfunk-host/src/encode.rs

@@ -230,6 +230,14 @@ pub fn open_video(
     chroma: ChromaFormat,
 ) -> Result<Box<dyn Encoder>> {
     validate_dimensions(codec, width, height)?;
+    // Refresh/fps must be positive and sane: fps feeds the encoder time_base (`Rational(1, fps)`)
+    // and the pts→ns conversion (`pts * 1e9 / fps`), so 0 builds a 1/0 rational / divides by zero.
+    // The mid-stream Reconfigure path already guards `refresh_hz > 0`; enforcing it at this single
+    // open chokepoint makes EVERY path (initial Hello, GameStream ANNOUNCE, Reconfigure) safe
+    // regardless of which backend opens (security-review 2026-06-28 S5).
+    if fps == 0 || fps > 1000 {
+        anyhow::bail!("invalid refresh/fps {fps}: must be 1..=1000 Hz");
+    }
     // 4:4:4 is HEVC-only. The negotiator should never pass `Yuv444` for another codec (it gates on
     // `codec == H265`), but defend the contract here so a future caller can't silently emit a stream
     // no decoder expects: a non-HEVC 4:4:4 request degrades to 4:2:0 with a warning.

crates/punktfunk-host/src/gamestream/apps.rs

@@ -17,6 +17,10 @@ pub struct AppEntry {
     pub compositor: Option<crate::vdisplay::Compositor>,
     /// Command gamescope runs nested (gamescope entries only).
     pub cmd: Option<String>,
+    /// Store-qualified library id (`steam:570`, `epic:…`) for entries surfaced from the host's game
+    /// library ([`crate::library`]). When set, the launch path resolves + launches it against the
+    /// host's own library instead of running [`cmd`](Self::cmd). `None` for Desktop / apps.json entries.
+    pub library_id: Option<String>,
 }
 
 fn config_path() -> Option<std::path::PathBuf> {
@@ -35,9 +39,18 @@ fn parse_compositor(s: &str) -> Option<crate::vdisplay::Compositor> {
     }
 }
 
-/// The catalog: the user's `apps.json` if present, else defaults (Desktop, plus gamescope
+/// The GameStream catalog Moonlight sees in `/applist`: the operator base ([`base_catalog`] — Desktop +
-/// entries when gamescope is installed).
+/// apps.json) with the host's auto-detected game library ([`append_library`]) layered on top, so a
+/// Moonlight client sees the same Steam/Epic/GOG/Xbox titles the native clients do instead of just Desktop.
 pub fn catalog() -> Vec<AppEntry> {
+    let mut apps = base_catalog();
+    append_library(&mut apps);
+    apps
+}
+
+/// The operator base: the user's `apps.json` if present, else defaults (Desktop, plus gamescope
+/// entries when gamescope is installed). The installed game library is layered on by [`append_library`].
+fn base_catalog() -> Vec<AppEntry> {
     if let Some(path) = config_path() {
         if let Ok(raw) = std::fs::read_to_string(&path) {
             match serde_json::from_str::<Value>(&raw) {
@@ -53,6 +66,7 @@ pub fn catalog() -> Vec<AppEntry> {
                                     .and_then(|c| c.as_str())
                                     .and_then(parse_compositor),
                                 cmd: it.get("cmd").and_then(|c| c.as_str()).map(String::from),
+                                library_id: None,
                             })
                         })
                         .collect();
@@ -72,6 +86,7 @@ pub fn catalog() -> Vec<AppEntry> {
         title: "Desktop".into(),
         compositor: None,
         cmd: None,
+        library_id: None,
     }];
     if which("gamescope") {
         if which("steam") {
@@ -80,6 +95,7 @@ pub fn catalog() -> Vec<AppEntry> {
                 title: "Steam".into(),
                 compositor: Some(crate::vdisplay::Compositor::Gamescope),
                 cmd: Some("steam -gamepadui".into()),
+                library_id: None,
             });
         }
         if which("vkcube") {
@@ -88,23 +104,79 @@ pub fn catalog() -> Vec<AppEntry> {
                 title: "vkcube (test)".into(),
                 compositor: Some(crate::vdisplay::Compositor::Gamescope),
                 cmd: Some("vkcube".into()),
+                library_id: None,
             });
         }
     }
     apps
 }
 
+/// The high half of the positive `i32` range — where library-derived GameStream ids live, kept clear of
+/// the small Desktop/apps.json ids so the two never collide.
+const LIBRARY_ID_BASE: u32 = 0x4000_0000;
+
+/// Append the host's installed game library ([`crate::library::all_games`] — Steam/Epic/GOG/Xbox/custom)
+/// to `apps`. Each title gets a STABLE GameStream `<ID>` derived from its store-qualified library id
+/// (Moonlight caches appids, so a title keeps its id across host restarts), carries that library id so
+/// the launch path resolves it against the host's own library, and is de-duplicated (by id) against the
+/// base catalog and the other library entries. Titles with no launch recipe are skipped (un-startable).
+fn append_library(apps: &mut Vec<AppEntry>) {
+    let mut used: std::collections::HashSet<u32> = apps.iter().map(|a| a.id).collect();
+    for g in crate::library::all_games() {
+        if g.launch.is_none() {
+            continue;
+        }
+        let mut id = stable_app_id(&g.id);
+        // Linear-probe within the library range on the (rare) hash collision — deterministic given the
+        // stable all_games() order, so a title keeps its id run to run.
+        while !used.insert(id) {
+            id = LIBRARY_ID_BASE | (id.wrapping_add(1) & 0x3FFF_FFFF);
+        }
+        apps.push(AppEntry {
+            id,
+            title: g.title,
+            compositor: None, // auto-detect the desktop session (Windows ignores the compositor)
+            cmd: None,
+            library_id: Some(g.id),
+        });
+    }
+}
+
+/// A STABLE GameStream `<ID>` for a store-qualified library id (`steam:570`): FNV-1a-32 folded into the
+/// high half of the positive `i32` range ([`LIBRARY_ID_BASE`]). Deterministic across runs and clear of
+/// the reserved small Desktop/apps.json ids.
+fn stable_app_id(library_id: &str) -> u32 {
+    let mut h: u32 = 0x811c_9dc5;
+    for b in library_id.bytes() {
+        h ^= b as u32;
+        h = h.wrapping_mul(0x0100_0193);
+    }
+    LIBRARY_ID_BASE | (h & 0x3FFF_FFFF)
+}
+
 pub fn by_id(id: u32) -> Option<AppEntry> {
     catalog().into_iter().find(|a| a.id == id)
 }
 
-/// Render the GameStream `/applist` XML.
+/// Box-art bytes for the GameStream `/appasset` cover proxy: resolve the Moonlight appid to its catalog
+/// entry, then (for a library title) fetch its cover from the host's library. `(bytes, content-type)`,
+/// or `None` for Desktop / apps.json entries (no art) or a fetch failure. Blocking (disk + network) —
+/// call off the async runtime.
+pub fn appasset_bytes(appid: u32) -> Option<(Vec<u8>, String)> {
+    let lib_id = by_id(appid)?.library_id?;
+    crate::library::fetch_box_art(&lib_id)
+}
+
+/// Render the GameStream `/applist` XML. `IsHdrSupported` reflects whether the host can actually deliver
+/// HDR (HEVC Main10 / PQ) for a title — host-wide today ([`crate::gamestream::host_hdr_capable`]); when
+/// true, Moonlight offers its per-app HDR toggle.
 pub fn applist_xml() -> String {
+    let hdr = u8::from(crate::gamestream::host_hdr_capable());
     let mut xml =
         String::from("<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<root status_code=\"200\">\n");
     for app in catalog() {
         xml.push_str(&format!(
-            "<App>\n<IsHdrSupported>0</IsHdrSupported>\n<AppTitle>{}</AppTitle>\n<ID>{}</ID>\n</App>\n",
+            "<App>\n<IsHdrSupported>{hdr}</IsHdrSupported>\n<AppTitle>{}</AppTitle>\n<ID>{}</ID>\n</App>\n",
             xml_escape(&app.title),
             app.id
         ));
@@ -130,10 +202,46 @@ mod tests {
 
     #[test]
     fn default_catalog_has_desktop() {
+        // catalog() = base (Desktop + apps.json) + the installed library; Desktop (id 1) is always present.
         let apps = catalog();
         assert!(apps.iter().any(|a| a.id == 1 && a.title == "Desktop"));
     }
 
+    #[test]
+    fn stable_app_id_is_deterministic_and_in_library_range() {
+        // Same id every run (Moonlight caches appids), distinct per title, and always in the high
+        // half of the positive i32 range so it never collides with the small Desktop/apps.json ids.
+        let a = stable_app_id("steam:570");
+        let b = stable_app_id("steam:570");
+        let c = stable_app_id("steam:271590");
+        assert_eq!(a, b);
+        assert_ne!(a, c);
+        for id in [a, c] {
+            assert!(id >= LIBRARY_ID_BASE, "id {id:#x} below library base");
+            assert!(id <= 0x7FFF_FFFF, "id {id:#x} not a positive i32");
+            assert_ne!(id, 1, "must not collide with Desktop");
+        }
+    }
+
+    #[test]
+    fn append_library_dedups_against_base_ids() {
+        // A base app whose id happens to fall in the library range must not be clobbered by a library
+        // entry that hashes to it — append_library probes past any used id.
+        let mut apps = vec![AppEntry {
+            id: stable_app_id("steam:570"),
+            title: "Pinned".into(),
+            compositor: None,
+            cmd: None,
+            library_id: None,
+        }];
+        append_library(&mut apps);
+        let ids: Vec<u32> = apps.iter().map(|a| a.id).collect();
+        let mut uniq = ids.clone();
+        uniq.sort_unstable();
+        uniq.dedup();
+        assert_eq!(ids.len(), uniq.len(), "duplicate GameStream ids in catalog");
+    }
+
     #[test]
     fn applist_xml_is_wellformed_ish() {
         let xml = applist_xml();

crates/punktfunk-host/src/gamestream/control.rs

@@ -56,6 +56,9 @@ pub fn spawn(state: Arc<AppState>) -> Result<()> {
         .spawn(move || {
             // GCM scheme detected from the first authenticating packet; reused thereafter.
             let mut detected: Option<Scheme> = None;
+            // Consecutive control-decrypt failures for this peer — throttles the warn log so a
+            // junk-packet flood can't spam unbounded lines (security-review 2026-06-28 #10).
+            let mut decrypt_fails: u64 = 0;
             // Decoded keyboard/mouse is forwarded to a dedicated host-lifetime injector thread —
             // NEVER injected inline, so a slow Wayland/libei/SendInput call can't head-block ENet
             // keepalive/retransmit servicing on this thread. The injector owns non-Send compositor
@@ -77,6 +80,7 @@ pub fn spawn(state: Arc<AppState>) -> Result<()> {
                             Event::Disconnect { .. } => {
                                 tracing::info!("control: client disconnected");
                                 detected = None;
+                                decrypt_fails = 0;
                                 peer = None;
                                 // Unplug the session's virtual pads.
                                 pads = GamepadManager::new();
@@ -89,6 +93,7 @@ pub fn spawn(state: Arc<AppState>) -> Result<()> {
                                     channel_id,
                                     packet.data(),
                                     &mut detected,
+                                    &mut decrypt_fails,
                                     &inj_tx,
                                     &mut pads,
                                 );
@@ -163,6 +168,7 @@ fn on_receive(
     _channel_id: u8,
     d: &[u8],
     detected: &mut Option<Scheme>,
+    decrypt_fails: &mut u64,
     inj_tx: &Sender<InputEvent>,
     pads: &mut GamepadManager,
 ) {
@@ -180,10 +186,20 @@ fn on_receive(
                 tracing::info!(?scheme, "control: GCM scheme locked in");
             }
             *detected = Some(scheme);
+            *decrypt_fails = 0;
             pt
         }
         None => {
-            tracing::warn!(len = d.len(), "control: GCM decrypt failed");
+            // Throttle: a junk-packet flood must not spam one warn line per packet. Log the first
+            // failure, then only at exponentially-spaced counts (1, 2, 4, 8, …).
+            *decrypt_fails += 1;
+            if decrypt_fails.is_power_of_two() {
+                tracing::warn!(
+                    len = d.len(),
+                    fails = *decrypt_fails,
+                    "control: GCM decrypt failed"
+                );
+            }
             return;
         }
     };