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Refresh the README and documentation for public visitors: - README: public-facing rewrite with accurate status for all four native clients (macOS, Linux, Windows, Android) and the Windows host. - docs site: fix stale client status (Android is a full client, not a scaffold; Windows client is stage-1 complete + signed MSIX), add the missing Android client section, correct "which client" guidance. - Windows host: corrected from "deferred/scoped" to implemented & shipping (NVIDIA-only, x64-only) across windows-host, roadmap, status, requirements, running-as-a-service, and the README. - Remove internal infrastructure from public docs (box names, private IPs, SSH/token commands, deploy topology); rewrite status.md as a public project-status page; sanitize ci.md and implementation-plan.md. - Update clients/android and clients/apple READMEs to current state. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
83 lines
4.4 KiB
Markdown
83 lines
4.4 KiB
Markdown
# punktfunk Android client
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Native Android client for **punktfunk/1**, targeting **phone + TV** (Compose, D-pad + touch).
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## Architecture — Rust-heavy (like the Linux client, not thin-native like Apple)
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Kotlin cannot `import` the cbindgen C header the way Swift can, so a native bridge is unavoidable.
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We write it in **Rust** and link `punktfunk-core` directly — so the Android client reuses the Linux
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client's orchestration (audio jitter ring, VK keymap inverse, latency/skew math, capture state
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machine, trust logic) instead of re-porting it into Kotlin.
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| Side | Owns |
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|------|------|
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| **Rust** (`clients/android/native` → `libpunktfunk_android.so`) | the JNI seam, `NativeClient` (QUIC control + UDP data plane), AnnexB→`AMediaCodec` decode, Opus+Oboe audio, VK keymap, latency math, trust/pairing |
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| **Kotlin** (`clients/android`) | Compose UI (host grid / settings / stream), `SurfaceView` lifecycle, input capture, `NsdManager` discovery, Keystore identity, permissions |
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The single seam is `io.unom.punktfunk.kit.NativeBridge` ⇄ `Java_io_unom_punktfunk_kit_NativeBridge_*`.
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## Layout
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```
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clients/android/native/ Rust cdylib (workspace member) — links punktfunk-core directly
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src/lib.rs JNI seam (connect/pair, input, plane getters, abi/core version)
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src/session.rs session lifecycle + plane pumps
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src/decode.rs AnnexB → AMediaCodec HEVC hardware decode → SurfaceView (incl. HDR10)
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src/audio.rs · src/mic.rs Opus + Oboe playback / mic uplink (jitter ring)
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src/feedback.rs rumble + HID output (lightbar / adaptive triggers)
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src/stats.rs live video stats
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clients/android/ Gradle project (this dir)
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settings.gradle.kts · build.gradle.kts · gradle.properties · gradlew
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app/ :app — Compose UI: Connect / Settings / Stream screens (phone + TV)
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kit/ :kit — NativeBridge · discovery (NsdManager) · Gamepad · Keymap ·
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security (Keystore identity + known-host store) · cargo-ndk build
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```
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## Prerequisites
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- Android SDK + **NDK r30** (`30.0.14904198`), `platforms;android-37.0`, `build-tools;37.0.0`,
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**`cmake;3.22.1`** (`sdkmanager "cmake;3.22.1"` — the `cmake` crate builds libopus with it)
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- **JDK 21** for Gradle/AGP (AGP 9.2 runs on JDK 17–21, *not* a newer default JDK like 25)
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- Rust + `rustup target add aarch64-linux-android x86_64-linux-android` + `cargo install cargo-ndk`
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Toolchain pinned: AGP 9.2.0 · Gradle 9.4.1 · Kotlin 2.3.21 · Compose BOM 2026.05.01 ·
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compileSdk 37 · targetSdk 36 · minSdk 31 · ABIs arm64-v8a + x86_64.
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## Build & run
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**Android Studio:** open `clients/android` — it uses its bundled JBR 21 automatically. The
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`cargoNdk*` task builds the `.so` as part of the normal build.
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**CLI** (point Gradle at a JDK 21 if your machine default is newer, e.g. JDK 25):
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```sh
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# Adoptium/Temurin 21 (installed by the Android Studio setup, or `brew install temurin@21`):
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export JAVA_HOME="$(/usr/libexec/java_home -v 21)"
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cd clients/android
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./gradlew :app:assembleDebug # cargo-ndk cross-compiles libpunktfunk_android.so first
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./gradlew :app:installDebug # onto a running emulator/device
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# Emulators (created during env setup): emulator -avd pf_phone | emulator -avd pf_tv
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```
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The debug APK lands in `app/build/outputs/apk/debug/`. Launch it, pick a host from the list, pair,
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and stream.
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## Status
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A working native client (phone + Android TV), at parity with the Linux and Apple apps for the core
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streaming experience:
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- **Video** — `AMediaCodec` hardware HEVC decode → `SurfaceView`, including **HDR10** (Main10 /
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BT.2020 PQ), with low-latency decode tuning and a live stats HUD.
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- **Audio** — Opus + Oboe playback with a jitter ring, plus mic uplink to the host.
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- **Input** — game controllers (buttons + axes) with rumble and HID feedback; D-pad /
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game-controller focus navigation for the couch (TV + phone).
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- **Discovery & trust** — `NsdManager` mDNS host list, SPAKE2 PIN pairing and TOFU, with a
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Keystore-wrapped client identity and a known-host store.
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- **UI** — Compose host list / settings / stream screens, Material You theming.
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- **Shipping** — built for `arm64-v8a` + `x86_64`; published to Google Play (Internal Testing).
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`crates/punktfunk-core` uses the `ring` `rcgen` backend so the client `.so` is aws-lc-free.
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