enricobuehler
a01f8a2f58
Root cause of the ACCESS_LOST (0x887A0026) churn + context-change freeze, found live: the box is a HYBRID system (RTX 4090 + AMD Radeon iGPU + SudoVDA). DXGI does hybrid GPU-preference resolution and REPARENTS the SudoVDA output between adapters (SET_RENDER_ADAPTER is ignored — the IDD lands on the iGPU 0x23664 while we duplicate on the 4090 0x15768), which constantly invalidates Desktop Duplication. Apollo runs fine on this same box because it hooks this away. Port Apollo's hook: replace win32u.dll!NtGdiDdDDIGetCachedHybridQueryValue to always report D3DKMT_GPU_PREFERENCE_STATE_UNSPECIFIED, so DXGI skips preference resolution and never reparents the output → DDA stays on one adapter. Installed once before the first DXGI factory/enumeration (DuplCapturer::open). We fully replace the function (never call the original) so a 12-byte absolute-jmp prologue patch suffices — no detour crate / C length-disassembler dependency, just VirtualProtect. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
punktfunk
A ground-up low-latency desktop streaming stack, built Linux-first, with a shared Rust protocol core and native clients per platform.
punktfunk is a placeholder codename. The bet: ship a Linux virtual-display streaming
host that speaks the existing Moonlight protocol (every Moonlight/Artemis client works
day one), then break the ~1 Gbps FEC wall with a GF(2¹⁶) Leopard-RS transport as a
negotiated extension. See docs/implementation-plan.md.
Status
| Milestone | State |
|---|---|
M1 — punktfunk-core + C ABI |
✅ done & hardened (FEC, packetization, AES-GCM, session, adversarial-review fixes, punktfunk_core.h) |
| M2 — GameStream host → stock Moonlight | ✅ live end-to-end: pairing, RTSP, audio, per-client virtual output at native res, GPU zero-copy NVENC, gamepads |
M3 — punktfunk/1 native protocol |
✅ validated live: QUIC control + GF(2¹⁶) FEC/AES data plane, SPAKE2 PIN pairing, mid-stream mode renegotiation |
| M4 — client decode + present (Apple) | 🟡 macOS first light: AnnexB→VideoToolbox HEVC on glass + input/pairing over punktfunk/1 (clients/apple); iOS + presenter next |
| Web console + management API | ✅ TanStack web console (web/) over the OpenAPI mgmt API: host status, paired devices, on-demand native pairing (arm → show PIN) |
The GameStream host works with a stock Moonlight client — validated live on NVIDIA
(RTX 5070 Ti & RTX 4090, driver 595): trust-on-first-use pairing that persists, an app
catalog, RTSP/ENet/audio, and video at the client's exact resolution and refresh via a
per-session virtual output (KWin, gamescope, Mutter, Sway backends), encoded with GPU
zero-copy (dmabuf → CUDA/Vulkan → NVENC) at up to 5120×1440@240. The native
punktfunk/1 protocol adds a QUIC control plane and a GF(2¹⁶) Leopard-FEC + AES-GCM data
plane (p50 ~0.8 ms capture→reassembled at 720p120). Its trust model is SPAKE2 PIN pairing by
default — a new host requires the PIN ceremony; trust-on-first-use is an explicit host opt-in
(m3-host --allow-tofu / serve --open, advertised as pair=optional) for fully trusted LANs. Both
run from one process (serve --native), managed through a REST API + web console. Builds
against FFmpeg 7 or 8; deployed live on Bazzite. Full status: CLAUDE.md;
roadmap, setup guides & progress: the docs site (docs-site/ — Fumadocs;
bun run dev), with the canonical roadmap and
status there. Design notes stay in docs/.
Install (host)
The package registries are the real distribution channel — pick your distro and run one command. Per-distro setup (add the repo, first-run, web console) lives in the linked READMEs.
| Distro | One-command happy path | Details |
|---|---|---|
| Ubuntu / Debian (apt) | sudo apt install punktfunk-host (after adding the repo) |
packaging/debian/README.md |
| Fedora / Bazzite (rpm-ostree) | rpm-ostree install punktfunk punktfunk-web (after adding the repo; or the bootc image) |
packaging/rpm/README.md |
| Arch / Steam Deck (PKGBUILD / sysext) | makepkg -si (Arch) · sysext .raw (SteamOS/Deck) |
packaging/arch/README.md |
punktfunk-host is the streaming host; punktfunk-web is the browser console (pairing + status);
punktfunk-client is the GTK4 desktop client (also shipped via apt/RPM/Arch/Flatpak). After install,
run punktfunk-host serve --native inside your desktop session, then pair from the web console.
Building from source (below) is a fallback.
Layout
crates/
punktfunk-core/ protocol · FEC · pacing · crypto · quic — the C ABI (lib + cdylib + staticlib)
punktfunk-host/ Linux host: vdisplay · capture · encode · inject · gamestream · m3 · mgmt · native_pairing
punktfunk-client-rs/ punktfunk/1 reference client (M3 headless; M4 adds decode+present)
clients/{apple,android}/ native client scaffolds (import punktfunk_core.h); apple = macOS first light
web/ TanStack web console (host status · paired devices · pairing) over the mgmt API
packaging/ Fedora/Bazzite RPM · bootc image · COPR (see packaging/bazzite/README.md)
include/punktfunk_core.h cbindgen-generated C header (checked in)
tools/{latency-probe,loss-harness}/ measurement (plan §10)
docs/{implementation-plan,roadmap,windows-host,dualsense-haptics}.md
Build & test (from source)
For development, or as an install fallback where no package is available:
cargo build --workspace # green on Linux and macOS
cargo test --workspace # unit + loopback + proptest + C ABI harness
cargo clippy --workspace --all-targets
cargo run -p loss-harness # FEC loss-resilience sweep (no network needed)
bash crates/punktfunk-core/tests/c/run.sh # standalone C-ABI link+round-trip proof
The C header regenerates from crates/punktfunk-core/src/abi.rs on every build (cbindgen via
build.rs) into include/punktfunk_core.h.
Design invariants
- One core, linked everywhere. Protocol/FEC/crypto/pacing live in
punktfunk-coreexactly once, exposed over a stable, versioned C ABI (punktfunk_abi_version(),PunktfunkConfigcarries its ownstruct_size). - No async on the hot path. The per-frame pipeline uses native threads only;
tokio/quinnare gated behind the off-by-defaultquicfeature (control plane only). - FEC is the wall-breaker. GF(2⁸) (≤255 shards/block) for Moonlight compat; GF(2¹⁶) (≤65535 shards/block, SIMD, O(n log n)) to push past ~1 Gbps.
License
MIT OR Apache-2.0.