enricobuehler
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The console settings were one 30-row scroll, which on a Deck meant thumbing past Video and Audio to reach the pad settings. They are now split across sections — Stream · Video · Audio · Controller · Interface · Profiles, plus Input on the desktop console, which alone carries the touch/mouse rows. L1/R1 walks them, each section remembers where its cursor was, and the names are the same word on every client so a setting is where you looked for it last. Shoulders are not the only route, because a D-pad remote hasn't got any: on Android, Up from the first row moves onto the strip (left/right walks sections there, A drops back in), and on tvOS the pills are focusable, so the focus engine handles it — a Siri Remote has no extended gamepad profile and never reaches the input poll at all. The desktop console needs neither; PageUp and PageDown already map to the same events. New "Background" row, six palettes: Violet (the brand default), Tide, Forest, Ember, Rose, Graphite. A palette is a hue rotation plus a saturation scale over the ONE colour field each client already draws, so every palette inherits its structure and Violet is the identity transform — existing installs see exactly what they see today. The maths is ported three times (Rust/Swift/Kotlin) under one shared `ui_palette` key, with the same assertions pinned in each language. It is presentation only, so it is a device preference and never part of a profile. The form screens no longer have a backdrop of their own. Settings, add-host and pair used to sit on a still gradient; they now wear the same living field at a calm mix — pools dimmed onto the palette's own corner colour, vignette halved so rows that run to the edges don't get crushed. On the desktop console that collapsed the old aurora-over-static crossfade into one shader pass with a chased uniform. Motion speed is identical in both modes on purpose: changing it would make the field jump mid-transition. Nothing in the gamepad UI is backed by a static image now, and Reduce Motion (Apple) / "remove animations" (Android) still freeze it. Also: the settings screen had no raster coverage at all — the eyeball dump is `#[ignore]`d — so a new test draws every tab, and the Android screenshot set gains a console-settings scene. Both earned their keep immediately: the renders showed the extra hint pushing "Done" off a 360 dp phone (the legend scrolls now, and the Section cell only appears where shoulders exist) and the form backdrop crushing its own edges.
punktfunk — Android client (phone & TV)
The native Android app for streaming a punktfunk host to your phone, tablet, or Android TV. A Compose app that finds hosts on your network, pairs with a PIN, and streams at the display's own resolution — with hardware HEVC decode, HDR10, and controller support, built for both touch and the couch (D-pad / gamepad focus navigation).
Features
- Hardware decode — NDK
AMediaCodecHEVC →SurfaceView, including HDR10 (Main10 / BT.2020 PQ), with low-latency tuning and a live stats HUD. - Audio both ways — Opus + AAudio playback with a jitter ring, plus mic uplink to the host.
- Controller support — buttons + axes with rumble and HID feedback (lightbar / adaptive triggers); D-pad / gamepad focus navigation for TV and phone.
- Find hosts automatically — native mDNS discovery; first connect does a one-time SPAKE2 PIN pairing (or TOFU on trusted LANs), then reconnects on a Keystore-wrapped, pinned identity.
- Compose UI — Connect / Settings / Stream screens with Material You theming.
Built for arm64-v8a + armeabi-v7a + x86_64 — the 32-bit armeabi-v7a slice is what keeps the
app installable on the many 32-bit Google TV / Android TV streamers (Walmart onn. 4K, Chromecast with
Google TV, budget Amlogic boxes) that otherwise reject a 64-bit-only build as "not compatible".
Get it
Published to Google Play (Internal Testing) — join the beta via the Discord. Per-device setup and pairing: docs.punktfunk.unom.io/docs/install-client.
How it's built — Rust-heavy
Kotlin can't import the cbindgen C header the way Swift can, so a native bridge is unavoidable. We
write it in Rust and link punktfunk-core directly — so the Android client reuses the Linux
client's orchestration (audio jitter ring, VK keymap inverse, latency/skew math, capture state
machine, trust logic) instead of re-porting it into Kotlin.
| Side | Owns |
|---|---|
Rust (native/ → libpunktfunk_android.so) |
the JNI seam, NativeClient (QUIC control + UDP data plane), AnnexB → AMediaCodec decode (incl. HDR10), Opus + AAudio audio + mic, controller feedback, latency math, trust/pairing, mdns-sd discovery |
Kotlin (app/, kit/) |
Compose UI, SurfaceView lifecycle, input capture, the Wi-Fi MulticastLock + permission UX, Keystore identity |
The single seam is io.unom.punktfunk.kit.NativeBridge ⇄ Java_io_unom_punktfunk_kit_NativeBridge_*.
native/ Rust cdylib (workspace member) — links punktfunk-core directly
src/lib.rs crate doc · JNI_OnLoad · version probes
src/session/ session lifecycle: connect/pair + trust, plane start/stop, input shims
src/decode.rs AnnexB → AMediaCodec HEVC hardware decode → SurfaceView (incl. HDR10)
src/audio.rs · src/mic.rs Opus + AAudio playback / mic uplink
src/feedback.rs · src/stats.rs rumble + HID feedback; live video stats
src/discovery.rs native mdns-sd browse of the host's _punktfunk._udp advert
app/ :app — Compose UI: Connect / Settings / Stream (phone + TV)
kit/ :kit — NativeBridge · native mDNS discovery · Gamepad · Keymap · Keystore identity
Build & run
Prerequisites: Android SDK + NDK r30 (30.0.14904198), platforms;android-37.0,
build-tools;37.0.0, cmake;3.22.1 (builds libopus); JDK 21 (AGP 9.2 runs on JDK 17–21, not
a newer default); Rust with rustup target add aarch64-linux-android armv7-linux-androideabi x86_64-linux-android and
cargo install cargo-ndk. Toolchain is pinned (AGP 9.2 · Gradle 9.4.1 · Kotlin 2.3.21 · Compose BOM
2026.05.01 · compileSdk 37 · minSdk 28).
Android Studio: open clients/android — it uses its bundled JBR 21, and the cargoNdk* task
builds the .so as part of the normal build.
CLI (point Gradle at JDK 21 if your machine default is newer):
export JAVA_HOME="$(/usr/libexec/java_home -v 21)" # or your Temurin 21 path
cd clients/android
./gradlew :app:assembleDebug # cargo-ndk cross-compiles libpunktfunk_android.so first
./gradlew :app:installDebug # onto a running emulator/device
# emulators from env setup: emulator -avd pf_phone | emulator -avd pf_tv
The debug APK lands in app/build/outputs/apk/debug/. Launch it, pick a host, pair, and stream.
Related
- Documentation — quick start, pairing, troubleshooting
- Project README — the host, the other clients, and how it all fits together