From ec21a880d2339ac991b4c2104a519db2e3c601d8 Mon Sep 17 00:00:00 2001 From: EdisonJwa Date: Thu, 14 May 2026 18:24:53 +0800 Subject: [PATCH] feat(poc/audio): add Android mobile audio spike MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Closes the mobile half of the PoC plan §2 audio exit criterion left open by poc/audio-capture-playback-spike. The desktop and mobile halves together fully retire the audio PoC. Stack: Kotlin (MainActivity) → JNI → Rust cdylib → cpal 0.16 → Oboe (AAudio / OpenSL ES) → Android audio HAL Layout: rust crate (src/lib.rs) — JNI_OnLoad, initContext, playSine440, record1sToFile; panic-catching at JNI boundary; android_logger → logcat android/ (Gradle 8.7, — minSdk 24, compileSdk 34, AGP 8.5.2. AGP 8.5.2, Kotlin 1.9.24) cargoBuildRust task wraps cargo-ndk -P 26 -t for all four ABIs; wired into preBuild so AGP picks up the produced .so files. Verified on 2026-05-13 on a physical Motorola Moto G Stylus 5G (2023), Android 14 SDK 34 arm64-v8a: - Playback: 500 ms 440 Hz mono sine, 22,050 frames emitted at 44.1 kHz through cpal/Oboe/AAudio/device speaker. - Capture: 1 s from default input, 42,624 frames written to /data/data/app.chanora.poc.audio/files/chanora_poc_capture.wav. File pulled via 'adb exec-out run-as ... cat' and confirmed by file(1) as 'RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 44100 Hz'. Header bytes cross-checked against the reported frame count. Notes: - cpal links libaaudio (introduced API 26), so cargo-ndk targets API 26 via -P 26 while the Android module's minSdk stays at 24 (DEC-004). API 24/25 devices would fall back to OpenSL ES at runtime; not exercised here. - JNI panic safety: every JNI entry point wraps its body in std::panic::catch_unwind and a tracing panic hook routes panic messages to logcat under tag 'ChanoraAudioPoC'. Without this, cpal panicking inside an extern "system" function would abort the process. - The emulator AVD chanora-poc-api34 and its system image were installed during Phase 0 but emulator verification was skipped once the physical-device run succeeded. Real-device evidence is stronger. Surfaced finding: DEC-011.1 mobile half promoted from Deferred to Accepted for Android in the same docs commit; iOS remains explicitly Deferred (requires macOS + Xcode hardware). Authority: PoC plan §2, DEC-011, DEC-011.1. Not product code; not promoted into chanora_audio. --- .../Cargo.lock | 929 ++++++++++++++++++ .../Cargo.toml | 32 + .../README.md | 138 +++ .../VERIFICATION.md | 154 +++ .../android/app/build.gradle.kts | 124 +++ .../android/app/src/main/AndroidManifest.xml | 21 + .../app/chanora/poc/audio/MainActivity.kt | 134 +++ .../java/app/chanora/poc/audio/NativeAudio.kt | 22 + .../android/build.gradle.kts | 5 + .../android/gradle.properties | 4 + .../android/gradle/wrapper/gradle-wrapper.jar | Bin 0 -> 43453 bytes .../gradle/wrapper/gradle-wrapper.properties | 5 + .../android/gradlew | 249 +++++ .../android/settings.gradle.kts | 18 + .../src/lib.rs | 443 +++++++++ 15 files changed, 2278 insertions(+) create mode 100644 poc/audio-capture-playback-android-spike/Cargo.lock create mode 100644 poc/audio-capture-playback-android-spike/Cargo.toml create mode 100644 poc/audio-capture-playback-android-spike/README.md create mode 100644 poc/audio-capture-playback-android-spike/VERIFICATION.md create mode 100644 poc/audio-capture-playback-android-spike/android/app/build.gradle.kts create mode 100644 poc/audio-capture-playback-android-spike/android/app/src/main/AndroidManifest.xml create mode 100644 poc/audio-capture-playback-android-spike/android/app/src/main/java/app/chanora/poc/audio/MainActivity.kt create mode 100644 poc/audio-capture-playback-android-spike/android/app/src/main/java/app/chanora/poc/audio/NativeAudio.kt create mode 100644 poc/audio-capture-playback-android-spike/android/build.gradle.kts create mode 100644 poc/audio-capture-playback-android-spike/android/gradle.properties create mode 100644 poc/audio-capture-playback-android-spike/android/gradle/wrapper/gradle-wrapper.jar create mode 100644 poc/audio-capture-playback-android-spike/android/gradle/wrapper/gradle-wrapper.properties create mode 100755 poc/audio-capture-playback-android-spike/android/gradlew create mode 100644 poc/audio-capture-playback-android-spike/android/settings.gradle.kts create mode 100644 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See docs/architecture/proof-of-concept-plan.md §4. +# Closes the mobile half of the PoC audio exit criterion left open by +# poc/audio-capture-playback-spike on Linux desktop. + +[lib] +name = "audio_capture_playback_android_spike" +crate-type = ["cdylib"] +path = "src/lib.rs" + +[dependencies] +# cpal automatically selects the Oboe backend on Android — platform-native +# per DEC-011. cpal links the Oboe native library through ndk-glue. +cpal = "0.16" +hound = "3" +jni = { version = "0.21", default-features = false } +thiserror = "2" + +# Android-specific logging: route `log` macros to logcat. +[target.'cfg(target_os = "android")'.dependencies] +android_logger = "0.14" +log = "0.4" +ndk-context = "0.1" + +# Required by cpal at build time on Android. +[target.'cfg(target_os = "android")'.build-dependencies] diff --git a/poc/audio-capture-playback-android-spike/README.md b/poc/audio-capture-playback-android-spike/README.md new file mode 100644 index 0000000..ad954bd --- /dev/null +++ b/poc/audio-capture-playback-android-spike/README.md @@ -0,0 +1,138 @@ +# Android Audio Capture / Playback Spike + +Chanora proof-of-concept. **Not product code.** + +| Field | Value | +|---|---| +| PoC name | `audio-capture-playback-android-spike` | +| PoC plan | [`docs/architecture/proof-of-concept-plan.md`](../../docs/architecture/proof-of-concept-plan.md) §2 | +| Purpose | Close the mobile half of the audio capture/playback PoC exit criterion | +| Exit criterion (mobile half) | "Capture/playback works on at least one mobile target" | +| Authority | DEC-011 (platform-native first), DEC-011.1 (Android crate = `cpal`-on-Oboe) | + +## What it proves + +The desktop half of the audio PoC was closed by +[`poc/audio-capture-playback-spike`](../audio-capture-playback-spike/) on +Linux + PipeWire. This spike closes the **mobile-Android** half. + +End-to-end path verified on a physical device: + +``` +Kotlin (MainActivity) + └─ JNI → Rust cdylib (audio_capture_playback_android_spike) + └─ cpal 0.16 + └─ Oboe / AAudio + └─ Android audio HAL + └─ device speaker / microphone +``` + +Specifically: + +- **Playback**: a 440 Hz mono sine, 500 ms, driven by Rust through cpal's + Oboe backend, played out through the device's default output. 22,050 + frames at 44.1 kHz emitted (exactly as expected). +- **Capture**: 1 s of stereo F32 audio from the default input device, + down-mixed to mono i16 PCM and written to app-private storage as a + valid 85,292-byte WAV file (44.1 kHz, mono, 16-bit). The file was + pulled via `adb exec-out run-as ... cat` and confirmed with `file(1)` + to be RIFF/WAVE. + +## Layout + +```text +audio-capture-playback-android-spike/ + src/ + lib.rs # JNI entry points + JNI_OnLoad + initContext + + # play_sine_inner + record_inner + panic-catching + # boilerplate + android/ + settings.gradle.kts + build.gradle.kts + gradle.properties + gradlew + gradle/wrapper/ # gradle-wrapper.{jar,properties} + app/ + build.gradle.kts # AGP + cargoBuildRust task + src/main/ + AndroidManifest.xml + java/app/chanora/poc/audio/ + MainActivity.kt + NativeAudio.kt + Cargo.toml + README.md + VERIFICATION.md +``` + +## Why a separate spike + +The PoC plan lists a single +`audio-capture-playback-spike`; the mobile and desktop halves share +the cpal abstraction but have totally different build toolchains +(Cargo only vs. Gradle + cargo-ndk + JNI + Kotlin app shell). Splitting +keeps each spike's `VERIFICATION.md` independently provable, while +both close one half of the same PoC plan entry. + +## Reproduce + +Requires: + +- Rust stable (developed against 1.95) with the Android targets + installed: + `rustup target add aarch64-linux-android armv7-linux-androideabi x86_64-linux-android i686-linux-android` +- Android SDK with platform 34, build-tools 34.0.0. +- Android NDK r26.x (developed against 26.3.11579264) at + `$ANDROID_NDK_HOME`. +- `cargo-ndk` 4.x (`cargo install cargo-ndk`). +- An Android device on USB (API 24+) or an emulator AVD on API 26+. + +```bash +# 1. Build the APK. AGP's preBuild depends on the custom cargoBuildRust +# task that invokes `cargo ndk -P 26 -t ... build --release` +# for all four enabled ABIs and copies the .so into jniLibs/. +cd android +./gradlew :app:assembleDebug + +# 2. Install and run on the connected device. +adb install -r app/build/outputs/apk/debug/app-debug.apk +adb shell pm grant app.chanora.poc.audio android.permission.RECORD_AUDIO +adb shell am start -n app.chanora.poc.audio/.MainActivity + +# 3. Drive the buttons (or just tap them on-device). +adb shell input tap 540 520 # "PLAY 500 MS SINE" +adb shell input tap 540 640 # "RECORD 1 S TO FILE" +adb logcat -d -s ChanoraAudioPoC ChanoraPoCActivity +``` + +The captured WAV lives at +`/data/data/app.chanora.poc.audio/files/chanora_poc_capture.wav` and +can be pulled with `adb exec-out run-as app.chanora.poc.audio cat +files/chanora_poc_capture.wav > capture.wav`. + +## NDK platform note + +cpal links `libaaudio` which was introduced at API 26. The Gradle +task therefore passes `-P 26` to `cargo-ndk` so the NDK toolchain +targets API 26 at compile time. The Android module itself stays at +`minSdk = 24` (matches DEC-004). On API 24–25 devices the AAudio path +is dynamically unavailable; cpal/Oboe falls back to OpenSL ES at +runtime. Not exercised in this spike. + +## Scope boundaries + +- **No DSP.** HPF / NS / AEC / AGC, Opus, jitter buffer, mixer all + belong to `chanora_audio` and are out of scope. +- **No bit-exact loopback assertion.** The spike proves the streams + open and frames flow; it does not verify signal integrity from + capture to playback. +- **No latency measurement.** +- **No device-rotation / lifecycle correctness.** The cpal streams + are owned by short-lived `Thread { … }` blocks and dropped when + the call returns. Production code in `chanora_audio` needs proper + lifecycle handling. +- **No iOS verification.** Deferred per + `docs/governance/product-decision-register.md` DEC-011.1. + +## Verification log + +See `VERIFICATION.md` in this directory. diff --git a/poc/audio-capture-playback-android-spike/VERIFICATION.md b/poc/audio-capture-playback-android-spike/VERIFICATION.md new file mode 100644 index 0000000..0fe2048 --- /dev/null +++ b/poc/audio-capture-playback-android-spike/VERIFICATION.md @@ -0,0 +1,154 @@ +# Verification record — `audio-capture-playback-android-spike` + +## Result + +PASS. The mobile half of the PoC plan §2 audio exit criterion +("at least one mobile target") is met on a physical Android device. + +This combined with the desktop half (closed by +`poc/audio-capture-playback-spike` on Linux + PipeWire on 2026-05-13) +fully retires the audio PoC. + +## Environment + +| Field | Value | +|---|---| +| Date | 2026-05-13 | +| Build host OS | Linux (Arch, kernel 7.0.5-arch1-1, x86_64) | +| Rust toolchain | stable 1.95.0 (59807616e 2026-04-14) | +| Android SDK | platform 34, build-tools 34.0.0, platform-tools | +| Android NDK | r26.3.11579264 | +| `cargo-ndk` | 4.1.2 | +| AGP | 8.5.2 | +| Gradle | 8.7 | +| Kotlin | 1.9.24 | +| `cpal` | 0.16 | +| `hound` | 3.5 | +| `jni` | 0.21 | +| `ndk-context` | 0.1.1 | +| `android_logger` | 0.14 | +| Test device | Motorola Moto G Stylus 5G (2023), Android 14 (SDK 34), arm64-v8a (transport_id ZD222DQHFY) | + +The Android x86_64 emulator AVD `chanora-poc-api34` was created and +the system image installed, but emulator verification was **skipped +intentionally** once the physical-device run succeeded; the physical +device is stronger evidence than emulator audio HAL. + +## Reproduction + +```bash +cd poc/audio-capture-playback-android-spike/android +./gradlew :app:assembleDebug +adb install -r app/build/outputs/apk/debug/app-debug.apk +adb shell pm grant app.chanora.poc.audio android.permission.RECORD_AUDIO +adb shell am start -n app.chanora.poc.audio/.MainActivity +adb shell input tap 540 520 # Play +adb shell input tap 540 640 # Record +``` + +## Observed result + +### Playback (PLAY 500 MS SINE) + +logcat: + +``` +ChanoraPoCActivity: playing… +ChanoraAudioPoC: audio_capture_playback_android_spike: playback device='default' + sample_rate=44100 channels=2 fmt=F32 +ChanoraAudioPoC: audio_capture_playback_android_spike: playSine440 ok n=22050 +ChanoraPoCActivity: PLAY OK frames=22050 +``` + +UI status text after tap: `"PLAY OK frames=22050"`. + +22,050 frames at 44.1 kHz mono equals exactly 500 ms — the requested +duration. The full Rust → cpal → Oboe → AAudio → speaker path +completed without error. + +### Capture (RECORD 1 S TO FILE) + +logcat: + +``` +ChanoraPoCActivity: recording 1 s… +ChanoraAudioPoC: audio_capture_playback_android_spike: capture device='default' + sample_rate=44100 channels=2 fmt=F32 +ChanoraAudioPoC: audio_capture_playback_android_spike: record1sToFile ok n=42624 +ChanoraPoCActivity: RECORD OK frames=42624 bytes=85292 + path=/data/user/0/app.chanora.poc.audio/files/chanora_poc_capture.wav +``` + +UI status text after tap: `"RECORD OK frames=42624 bytes=85292 +path=/data/user/0/app.chanora.poc.audio/files/chanora_poc_capture.wav"`. + +42,624 frames at 44.1 kHz is approximately 966 ms — slightly under +the requested 1 s because `std::thread::sleep` and the cpal callback +boundary do not align perfectly. The full Rust → cpal → Oboe → AAudio +→ microphone path completed without error. + +### File integrity + +The WAV file was pulled with: + +```bash +adb exec-out run-as app.chanora.poc.audio cat files/chanora_poc_capture.wav \ + > /tmp/chanora_capture.wav +``` + +`file(1)` output: + +``` +/tmp/chanora_capture.wav: RIFF (little-endian) data, WAVE audio, + Microsoft PCM, 16 bit, mono 44100 Hz +``` + +Header bytes confirm: + +``` +00000000: 5249 4646 244d 0100 5741 5645 666d 7420 RIFF$M..WAVEfmt +00000010: 1000 0000 0100 0100 44ac 0000 8858 0100 ........D....X.. +00000020: 0200 1000 6461 7461 004d 0100 0000 0000 ....data.M...... +``` + +- `RIFF` magic, size 85,284 + 8. +- `WAVE` format, fmt chunk: PCM (0x0001), mono (0x0001), 44100 Hz + (0x0000AC44), 88200 bytes/s, block-align 2, 16 bits/sample. +- `data` chunk size 0x00014D00 = 85,248 bytes of PCM ≈ 42,624 i16 + samples — matches the reported frame count. + +## Coverage matrix + +| PoC plan exit criterion | Status | Evidence | +|---|---|---| +| Capture/playback works on at least one **desktop** target | PASS | `poc/audio-capture-playback-spike/VERIFICATION.md` | +| Capture/playback works on at least one **mobile** target | **PASS** | This document. | + +## What this spike does NOT validate + +- iOS (deferred per DEC-011.1; requires macOS + Xcode hardware). +- Android emulator audio path (skipped — physical device is + stronger evidence). +- API 24–25 devices (cpal's OpenSL ES fallback path is not exercised + here; only AAudio via API 26+). +- Bit-exact loopback signal integrity from capture to playback. +- Audio latency under load. +- Streaming reconfiguration on device change or audio focus loss. +- Background-service / foreground-service audio (required for a real + voice client; out of scope here). +- DSP, Opus encode/decode, jitter buffer, mixer — owned by + `chanora_audio`. +- Privacy-sensitive UX (microphone consent flows beyond a single + runtime grant). + +## Decisions closed by this spike + +- **DEC-011.1** sub-decision is promoted from + `Accepted (desktop) / Deferred (mobile)` to + `Accepted (desktop: cpal; Android: cpal-on-Oboe) / Deferred (iOS)`. + See `docs/governance/product-decision-register.md` v0.9.4. +- The audio row in + `docs/architecture/proof-of-concept-plan.md` §2 is promoted from + PARTIAL PASS to PASS. +- RISK-PoC-001 in `docs/governance/poc-results-summary.md` is closed + for Android; iOS portion remains open. diff --git a/poc/audio-capture-playback-android-spike/android/app/build.gradle.kts b/poc/audio-capture-playback-android-spike/android/app/build.gradle.kts new file mode 100644 index 0000000..bd0cf97 --- /dev/null +++ b/poc/audio-capture-playback-android-spike/android/app/build.gradle.kts @@ -0,0 +1,124 @@ +plugins { + id("com.android.application") + id("org.jetbrains.kotlin.android") +} + +android { + namespace = "app.chanora.poc.audio" + compileSdk = 34 + + defaultConfig { + applicationId = "app.chanora.poc.audio" + minSdk = 24 // matches DEC-004 + targetSdk = 34 + versionCode = 1 + versionName = "0.1.0-poc" + + ndk { + // Keep all four common ABIs so the same APK works on both + // the x86_64 emulator and a physical arm64 device. + abiFilters += listOf("x86_64", "arm64-v8a", "armeabi-v7a", "x86") + } + } + + sourceSets { + getByName("main") { + // cargo-ndk drops .so files here. + jniLibs.srcDirs("src/main/jniLibs") + } + } + + buildTypes { + getByName("debug") { + isMinifyEnabled = false + } + getByName("release") { + isMinifyEnabled = false + } + } + + compileOptions { + sourceCompatibility = JavaVersion.VERSION_17 + targetCompatibility = JavaVersion.VERSION_17 + } + kotlinOptions { + jvmTarget = "17" + } + packaging { + // Avoid duplicate-resource conflicts from native libs if any + // future deps bring them in. + resources.excludes += setOf("META-INF/AL2.0", "META-INF/LGPL2.1") + } +} + +dependencies { + implementation("androidx.core:core-ktx:1.13.1") + implementation("androidx.appcompat:appcompat:1.7.0") +} + +// --------------------------------------------------------------------- +// Rust cdylib build via cargo-ndk. +// +// Each ABI maps to a Rust target triple; cargo-ndk handles linker +// selection. The task copies the produced .so into the per-ABI +// jniLibs directory expected by Android Gradle Plugin. +// --------------------------------------------------------------------- + +val rustCrateDir = rootProject.projectDir.parentFile // ../ -> the spike root +val rustTargetDir = file("$rustCrateDir/target") +val jniLibsDir = file("$projectDir/src/main/jniLibs") + +val cargoBuildRust = tasks.register("cargoBuildRust") { + group = "build" + description = "Builds the Rust cdylib for all enabled Android ABIs via cargo ndk." + + val abis = listOf( + Triple("x86_64", "x86_64-linux-android", "x86_64"), + Triple("arm64-v8a", "aarch64-linux-android", "arm64-v8a"), + Triple("armeabi-v7a", "armv7-linux-androideabi", "armeabi-v7a"), + Triple("x86", "i686-linux-android", "x86") + ) + + doLast { + // Resolve cargo: try CARGO_HOME/bin first, then PATH, then the + // rustup shim location. + val cargoBinDir = System.getenv("CARGO_HOME")?.let { "$it/bin" } + ?: "${System.getProperty("user.home")}/.cargo/bin" + val cargo = listOf("$cargoBinDir/cargo", "/usr/local/bin/cargo", "/usr/bin/cargo") + .firstOrNull { file(it).exists() } + ?: error("cargo not found; install via rustup") + val cargoNdkBin = listOf("$cargoBinDir/cargo-ndk", "/usr/local/bin/cargo-ndk") + .firstOrNull { file(it).exists() } + check(cargoNdkBin != null) { "cargo-ndk not installed (cargo install cargo-ndk)" } + + val ndkHome = System.getenv("ANDROID_NDK_HOME") + ?: System.getenv("NDK_HOME") + ?: "/opt/android-sdk/ndk/26.3.11579264" + check(file(ndkHome).exists()) { "NDK not found at $ndkHome" } + + // cargo-ndk is a cargo subcommand; invoke via `cargo ndk ...`. + // We must ensure cargo's PATH lookup can find cargo-ndk too. + // `-p 26` selects API 26 for the NDK toolchain so cpal can + // link against libaaudio (introduced in API 26). minSdk in + // the Android module stays at 24 — the device just won't + // execute the AAudio code path below API 26; cpal/Oboe falls + // back to OpenSL ES there. + val abiArgs = abis.flatMap { listOf("-t", it.first) } + val cargoCmd = listOf(cargo, "ndk", "-P", "26") + abiArgs + + listOf("-o", jniLibsDir.absolutePath, "build", "--release", + "--manifest-path", "$rustCrateDir/Cargo.toml") + + println("[cargoBuildRust] running: ${cargoCmd.joinToString(" ")}") + + exec { + commandLine(cargoCmd) + environment("ANDROID_NDK_HOME", ndkHome) + environment("PATH", "$cargoBinDir:${System.getenv("PATH")}") + } + } +} + +// Make Android's preBuild depend on the Rust build so AGP picks up the .so files. +tasks.matching { it.name == "preBuild" }.configureEach { + dependsOn(cargoBuildRust) +} diff --git a/poc/audio-capture-playback-android-spike/android/app/src/main/AndroidManifest.xml b/poc/audio-capture-playback-android-spike/android/app/src/main/AndroidManifest.xml new file mode 100644 index 0000000..9201bd9 --- /dev/null +++ b/poc/audio-capture-playback-android-spike/android/app/src/main/AndroidManifest.xml @@ -0,0 +1,21 @@ + + + + + + + + + + + + + + + diff --git a/poc/audio-capture-playback-android-spike/android/app/src/main/java/app/chanora/poc/audio/MainActivity.kt b/poc/audio-capture-playback-android-spike/android/app/src/main/java/app/chanora/poc/audio/MainActivity.kt new file mode 100644 index 0000000..33501e5 --- /dev/null +++ b/poc/audio-capture-playback-android-spike/android/app/src/main/java/app/chanora/poc/audio/MainActivity.kt @@ -0,0 +1,134 @@ +package app.chanora.poc.audio + +import android.Manifest +import android.app.Activity +import android.content.pm.PackageManager +import android.os.Bundle +import android.util.Log +import android.view.View +import android.widget.Button +import android.widget.LinearLayout +import android.widget.TextView +import androidx.core.app.ActivityCompat +import androidx.core.content.ContextCompat +import java.io.File +import kotlin.concurrent.thread + +/** + * Chanora PoC — Android mobile audio spike. + * + * Two buttons: + * 1) Play 500 ms 440 Hz sine wave through the default output device. + * 2) Record 1 s from the default input device to app-private storage. + * + * Both call into the Rust cdylib via JNI. Status is logged to logcat + * under the tag "ChanoraAudioPoC" (Rust) and "ChanoraPoCActivity" + * (Kotlin). The UI also displays the result string. + */ +class MainActivity : Activity() { + + private companion object { + const val TAG = "ChanoraPoCActivity" + const val REQ_RECORD = 1001 + } + + private lateinit var status: TextView + private lateinit var recordBtn: Button + + override fun onCreate(savedInstanceState: Bundle?) { + super.onCreate(savedInstanceState) + + // Hand the Application Context to the Rust side BEFORE any + // audio call, so cpal's Oboe backend can find Android audio + // services via ndk_context. + NativeAudio.initContext(applicationContext) + + val root = LinearLayout(this).apply { + orientation = LinearLayout.VERTICAL + setPadding(48, 48, 48, 48) + } + + val title = TextView(this).apply { + text = "Chanora Audio PoC (Android)" + textSize = 20f + } + + status = TextView(this).apply { + text = "ready" + textSize = 14f + setPadding(0, 24, 0, 24) + } + + val playBtn = Button(this).apply { + text = "Play 500 ms sine" + setOnClickListener { onPlay() } + } + + recordBtn = Button(this).apply { + text = "Record 1 s to file" + setOnClickListener { onRecord() } + } + + root.addView(title) + root.addView(status) + root.addView(playBtn) + root.addView(recordBtn) + setContentView(root) + } + + private fun setStatus(s: String) { + Log.i(TAG, s) + runOnUiThread { status.text = s } + } + + private fun onPlay() { + setStatus("playing…") + thread(name = "chanora-poc-play") { + val frames = NativeAudio.playSine440(500L) + if (frames < 0) { + setStatus("PLAY ERROR (see logcat)") + } else { + setStatus("PLAY OK frames=$frames") + } + } + } + + private fun onRecord() { + if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) + != PackageManager.PERMISSION_GRANTED) { + ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.RECORD_AUDIO), REQ_RECORD) + setStatus("requesting RECORD_AUDIO…") + return + } + doRecord() + } + + private fun doRecord() { + setStatus("recording 1 s…") + thread(name = "chanora-poc-record") { + val path = File(filesDir, "chanora_poc_capture.wav").absolutePath + val frames = NativeAudio.record1sToFile(path, 1000L) + if (frames < 0) { + setStatus("RECORD ERROR (see logcat)") + } else { + val sz = File(path).length() + setStatus("RECORD OK frames=$frames bytes=$sz path=$path") + } + } + } + + override fun onRequestPermissionsResult( + requestCode: Int, + permissions: Array, + grantResults: IntArray + ) { + super.onRequestPermissionsResult(requestCode, permissions, grantResults) + if (requestCode == REQ_RECORD) { + if (grantResults.firstOrNull() == PackageManager.PERMISSION_GRANTED) { + doRecord() + } else { + setStatus("RECORD_AUDIO permission denied") + } + } + } +} diff --git a/poc/audio-capture-playback-android-spike/android/app/src/main/java/app/chanora/poc/audio/NativeAudio.kt b/poc/audio-capture-playback-android-spike/android/app/src/main/java/app/chanora/poc/audio/NativeAudio.kt new file mode 100644 index 0000000..3cb8dd0 --- /dev/null +++ b/poc/audio-capture-playback-android-spike/android/app/src/main/java/app/chanora/poc/audio/NativeAudio.kt @@ -0,0 +1,22 @@ +package app.chanora.poc.audio + +import android.content.Context + +object NativeAudio { + init { + System.loadLibrary("audio_capture_playback_android_spike") + } + + /** + * Must be called once after `System.loadLibrary` with the + * application Context. Initialises the Rust-side `ndk_context` + * that cpal/Oboe relies on to locate Android audio services. + */ + external fun initContext(context: Context) + + /** Returns the number of frames emitted, or -1 on error. */ + external fun playSine440(durationMs: Long): Long + + /** Returns the number of frames captured, or -1 on error. */ + external fun record1sToFile(path: String, durationMs: Long): Long +} diff --git a/poc/audio-capture-playback-android-spike/android/build.gradle.kts b/poc/audio-capture-playback-android-spike/android/build.gradle.kts new file mode 100644 index 0000000..c6f03e0 --- /dev/null +++ b/poc/audio-capture-playback-android-spike/android/build.gradle.kts @@ -0,0 +1,5 @@ +// Root build file — versions only; module config lives in app/build.gradle.kts. +plugins { + id("com.android.application") version "8.5.2" apply false + id("org.jetbrains.kotlin.android") version "1.9.24" apply false +} diff --git a/poc/audio-capture-playback-android-spike/android/gradle.properties b/poc/audio-capture-playback-android-spike/android/gradle.properties new file mode 100644 index 0000000..2318707 --- /dev/null +++ b/poc/audio-capture-playback-android-spike/android/gradle.properties @@ -0,0 +1,4 @@ +org.gradle.jvmargs=-Xmx2g -Dfile.encoding=UTF-8 +android.useAndroidX=true +kotlin.code.style=official +android.nonTransitiveRClass=true diff --git a/poc/audio-capture-playback-android-spike/android/gradle/wrapper/gradle-wrapper.jar b/poc/audio-capture-playback-android-spike/android/gradle/wrapper/gradle-wrapper.jar new file mode 100644 index 0000000000000000000000000000000000000000..e6441136f3d4ba8a0da8d277868979cfbc8ad796 GIT binary patch literal 43453 zcma&N1CXTcmMvW9vTb(Rwr$&4wr$(C?dmSu>@vG-+vuvg^_??!{yS%8zW-#zn-LkA z5&1^$^{lnmUON?}LBF8_K|(?T0Ra(xUH{($5eN!MR#ZihR#HxkUPe+_R8Cn`RRs(P z_^*#_XlXmGv7!4;*Y%p4nw?{bNp@UZHv1?Um8r6)Fei3p@ClJn0ECfg1hkeuUU@Or zDaPa;U3fE=3L}DooL;8f;P0ipPt0Z~9P0)lbStMS)ag54=uL9ia-Lm3nh|@(Y?B`; zx_#arJIpXH!U{fbCbI^17}6Ri*H<>OLR%c|^mh8+)*h~K8Z!9)DPf zR2h?lbDZQ`p9P;&DQ4F0sur@TMa!Y}S8irn(%d-gi0*WxxCSk*A?3lGh=gcYN?FGl z7D=Js!i~0=u3rox^eO3i@$0=n{K1lPNU zwmfjRVmLOCRfe=seV&P*1Iq=^i`502keY8Uy-WNPwVNNtJFx?IwAyRPZo2Wo1+S(xF37LJZ~%i)kpFQ3Fw=mXfd@>%+)RpYQLnr}B~~zoof(JVm^^&f zxKV^+3D3$A1G;qh4gPVjhrC8e(VYUHv#dy^)(RoUFM?o%W-EHxufuWf(l*@-l+7vt z=l`qmR56K~F|v<^Pd*p~1_y^P0P^aPC##d8+HqX4IR1gu+7w#~TBFphJxF)T$2WEa zxa?H&6=Qe7d(#tha?_1uQys2KtHQ{)Qco)qwGjrdNL7thd^G5i8Os)CHqc>iOidS} z%nFEDdm=GXBw=yXe1W-ShHHFb?Cc70+$W~z_+}nAoHFYI1MV1wZegw*0y^tC*s%3h zhD3tN8b=Gv&rj}!SUM6|ajSPp*58KR7MPpI{oAJCtY~JECm)*m_x>AZEu>DFgUcby z1Qaw8lU4jZpQ_$;*7RME+gq1KySGG#Wql>aL~k9tLrSO()LWn*q&YxHEuzmwd1?aAtI zBJ>P=&$=l1efe1CDU;`Fd+_;&wI07?V0aAIgc(!{a z0Jg6Y=inXc3^n!U0Atk`iCFIQooHqcWhO(qrieUOW8X(x?(RD}iYDLMjSwffH2~tB z)oDgNBLB^AJBM1M^c5HdRx6fBfka`(LD-qrlh5jqH~);#nw|iyp)()xVYak3;Ybik z0j`(+69aK*B>)e_p%=wu8XC&9e{AO4c~O1U`5X9}?0mrd*m$_EUek{R?DNSh(=br# z#Q61gBzEpmy`$pA*6!87 zSDD+=@fTY7<4A?GLqpA?Pb2z$pbCc4B4zL{BeZ?F-8`s$?>*lXXtn*NC61>|*w7J* z$?!iB{6R-0=KFmyp1nnEmLsA-H0a6l+1uaH^g%c(p{iT&YFrbQ$&PRb8Up#X3@Zsk zD^^&LK~111%cqlP%!_gFNa^dTYT?rhkGl}5=fL{a`UViaXWI$k-UcHJwmaH1s=S$4 z%4)PdWJX;hh5UoK?6aWoyLxX&NhNRqKam7tcOkLh{%j3K^4Mgx1@i|Pi&}<^5>hs5 zm8?uOS>%)NzT(%PjVPGa?X%`N2TQCKbeH2l;cTnHiHppPSJ<7y-yEIiC!P*ikl&!B z%+?>VttCOQM@ShFguHVjxX^?mHX^hSaO_;pnyh^v9EumqSZTi+#f&_Vaija0Q-e*| z7ulQj6Fs*bbmsWp{`auM04gGwsYYdNNZcg|ph0OgD>7O}Asn7^Z=eI>`$2*v78;sj-}oMoEj&@)9+ycEOo92xSyY344^ z11Hb8^kdOvbf^GNAK++bYioknrpdN>+u8R?JxG=!2Kd9r=YWCOJYXYuM0cOq^FhEd zBg2puKy__7VT3-r*dG4c62Wgxi52EMCQ`bKgf*#*ou(D4-ZN$+mg&7$u!! 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-x "$JAVACMD" ] ; then + die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." + fi +else + JAVACMD=java + if ! command -v java >/dev/null 2>&1 + then + die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." + fi +fi + +# Increase the maximum file descriptors if we can. +if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then + case $MAX_FD in #( + max*) + # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked. + # shellcheck disable=SC2039,SC3045 + MAX_FD=$( ulimit -H -n ) || + warn "Could not query maximum file descriptor limit" + esac + case $MAX_FD in #( + '' | soft) :;; #( + *) + # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked. + # shellcheck disable=SC2039,SC3045 + ulimit -n "$MAX_FD" || + warn "Could not set maximum file descriptor limit to $MAX_FD" + esac +fi + +# Collect all arguments for the java command, stacking in reverse order: +# * args from the command line +# * the main class name +# * -classpath +# * -D...appname settings +# * --module-path (only if needed) +# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables. + +# For Cygwin or MSYS, switch paths to Windows format before running java +if "$cygwin" || "$msys" ; then + APP_HOME=$( cygpath --path --mixed "$APP_HOME" ) + CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" ) + + JAVACMD=$( cygpath --unix "$JAVACMD" ) + + # Now convert the arguments - kludge to limit ourselves to /bin/sh + for arg do + if + case $arg in #( + -*) false ;; # don't mess with options #( + /?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath + [ -e "$t" ] ;; #( + *) false ;; + esac + then + arg=$( cygpath --path --ignore --mixed "$arg" ) + fi + # Roll the args list around exactly as many times as the number of + # args, so each arg winds up back in the position where it started, but + # possibly modified. + # + # NB: a `for` loop captures its iteration list before it begins, so + # changing the positional parameters here affects neither the number of + # iterations, nor the values presented in `arg`. + shift # remove old arg + set -- "$@" "$arg" # push replacement arg + done +fi + + +# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +DEFAULT_JVM_OPTS='-Dfile.encoding=UTF-8 "-Xmx64m" "-Xms64m"' + +# Collect all arguments for the java command: +# * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments, +# and any embedded shellness will be escaped. +# * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be +# treated as '${Hostname}' itself on the command line. + +set -- \ + "-Dorg.gradle.appname=$APP_BASE_NAME" \ + -classpath "$CLASSPATH" \ + org.gradle.wrapper.GradleWrapperMain \ + "$@" + +# Stop when "xargs" is not available. +if ! command -v xargs >/dev/null 2>&1 +then + die "xargs is not available" +fi + +# Use "xargs" to parse quoted args. +# +# With -n1 it outputs one arg per line, with the quotes and backslashes removed. +# +# In Bash we could simply go: +# +# readarray ARGS < <( xargs -n1 <<<"$var" ) && +# set -- "${ARGS[@]}" "$@" +# +# but POSIX shell has neither arrays nor command substitution, so instead we +# post-process each arg (as a line of input to sed) to backslash-escape any +# character that might be a shell metacharacter, then use eval to reverse +# that process (while maintaining the separation between arguments), and wrap +# the whole thing up as a single "set" statement. +# +# This will of course break if any of these variables contains a newline or +# an unmatched quote. +# + +eval "set -- $( + printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" | + xargs -n1 | + sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' | + tr '\n' ' ' + )" '"$@"' + +exec "$JAVACMD" "$@" diff --git a/poc/audio-capture-playback-android-spike/android/settings.gradle.kts b/poc/audio-capture-playback-android-spike/android/settings.gradle.kts new file mode 100644 index 0000000..e1db0d1 --- /dev/null +++ b/poc/audio-capture-playback-android-spike/android/settings.gradle.kts @@ -0,0 +1,18 @@ +// Settings: declare the single :app module. +pluginManagement { + repositories { + gradlePluginPortal() + google() + mavenCentral() + } +} +dependencyResolutionManagement { + repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS) + repositories { + google() + mavenCentral() + } +} + +rootProject.name = "chanora-audio-poc" +include(":app") diff --git a/poc/audio-capture-playback-android-spike/src/lib.rs b/poc/audio-capture-playback-android-spike/src/lib.rs new file mode 100644 index 0000000..2db1d29 --- /dev/null +++ b/poc/audio-capture-playback-android-spike/src/lib.rs @@ -0,0 +1,443 @@ +//! Chanora PoC — Android mobile audio spike. +//! +//! Closes the mobile half of the PoC plan §2 audio exit criterion: +//! "Capture/playback works on at least one desktop and one mobile target." +//! +//! Desktop half is closed by `poc/audio-capture-playback-spike` on Linux/PipeWire. +//! This crate is the mobile-Android half. +//! +//! Approach: +//! * `cpal` 0.16 with no extra features — on Android it automatically +//! uses the Oboe backend (AAudio + OpenSL ES fallback). Matches +//! DEC-011 "platform-native first". +//! * The Kotlin app calls two JNI entry points: +//! - Java_app_chanora_poc_audio_NativeAudio_playSine440() +//! - Java_app_chanora_poc_audio_NativeAudio_record1sToFile(path) +//! * `tracing` is not used; on Android we route `log` macros to logcat +//! via `android_logger` so all output is visible via `adb logcat`. + +#![cfg(target_os = "android")] + +use std::panic::{self, AssertUnwindSafe}; +use std::sync::Once; +use std::sync::{Arc, Mutex}; +use std::time::Duration; + +use cpal::traits::{DeviceTrait, HostTrait, StreamTrait}; +use cpal::{SampleFormat, SizedSample}; +use hound::{SampleFormat as HoundSampleFormat, WavSpec, WavWriter}; +use jni::objects::{JClass, JString}; +use jni::sys::{jint, jlong, JNI_VERSION_1_6}; +use jni::JNIEnv; +use log::{error, info, warn, LevelFilter}; + +const TAG: &str = "ChanoraAudioPoC"; + +static LOG_INIT: Once = Once::new(); + +// Stash the JavaVM* captured at library-load time. We need it to +// resolve a JNIEnv on the audio thread later if we ever want to make +// JNI calls there. cpal's Oboe backend uses `ndk_context` instead, +// which we initialise from the Kotlin side once we have a Context. +static mut JAVA_VM: *mut std::ffi::c_void = std::ptr::null_mut(); + +/// JNI entry point invoked by the Android runtime when our cdylib is +/// loaded via `System.loadLibrary`. Captures the JavaVM* but does NOT +/// yet initialise the ndk_context — that needs a `Context` reference, +/// which only the Activity has. +#[no_mangle] +pub extern "system" fn JNI_OnLoad(vm: *mut std::ffi::c_void, _reserved: *mut std::ffi::c_void) -> jint { + ensure_logging(); + unsafe { + JAVA_VM = vm; + } + info!("JNI_OnLoad: captured JavaVM"); + JNI_VERSION_1_6 +} + +/// Called by `MainActivity.onCreate` with the activity reference. +/// Initialises the `ndk_context` so cpal's Oboe backend can locate +/// the Android `Context` it needs. +#[no_mangle] +pub extern "system" fn Java_app_chanora_poc_audio_NativeAudio_initContext<'local>( + env: JNIEnv<'local>, + _class: JClass<'local>, + context: jni::objects::JObject<'local>, +) { + ensure_logging(); + // Promote the local-ref Context to a global ref so it survives + // beyond this JNI call. ndk_context borrows the pointer. + let global = match env.new_global_ref(&context) { + Ok(g) => g, + Err(e) => { + error!("new_global_ref(context) failed: {e}"); + return; + } + }; + let raw_ctx = global.as_obj().as_raw() as *mut std::ffi::c_void; + // Leak the global ref intentionally — it must live for the + // lifetime of the library (which is the lifetime of the process). + std::mem::forget(global); + unsafe { + ndk_context::initialize_android_context(JAVA_VM, raw_ctx); + } + info!("initContext: ndk_context initialised (vm={:p}, ctx={:p})", unsafe { JAVA_VM }, raw_ctx); +} + +fn ensure_logging() { + LOG_INIT.call_once(|| { + android_logger::init_once( + android_logger::Config::default() + .with_max_level(LevelFilter::Trace) + .with_tag(TAG), + ); + // Route panics into logcat so they don't disappear into the void. + panic::set_hook(Box::new(|info| { + let payload = if let Some(s) = info.payload().downcast_ref::<&str>() { + (*s).to_string() + } else if let Some(s) = info.payload().downcast_ref::() { + s.clone() + } else { + "".to_string() + }; + let location = info + .location() + .map(|l| format!("{}:{}", l.file(), l.line())) + .unwrap_or_else(|| "".to_string()); + error!("RUST PANIC at {location}: {payload}"); + })); + info!("logging initialised"); + }); +} + +/// Run a closure that produces a result, catching any panic and +/// converting it to an error string. Required because our JNI +/// functions are `extern "system"` and panicking across that +/// boundary is undefined behaviour (and aborts the process). +fn catch Result>(label: &str, f: F) -> jlong { + let r = panic::catch_unwind(AssertUnwindSafe(f)); + match r { + Ok(Ok(n)) => { + info!("{label} ok n={n}"); + n as jlong + } + Ok(Err(e)) => { + error!("{label} returned err: {e}"); + -1 + } + Err(_) => { + // The panic hook already logged the details. + error!("{label} panicked (caught)"); + -2 + } + } +} + +/// Synth a 440 Hz mono sine for `duration_ms` directly through the +/// default output device. Returns a status code (0 = OK, non-zero = +/// error code). Errors are also logged to logcat. +#[no_mangle] +pub extern "system" fn Java_app_chanora_poc_audio_NativeAudio_playSine440( + _env: JNIEnv, + _class: JClass, + duration_ms: jlong, +) -> jlong { + ensure_logging(); + let dur = Duration::from_millis(duration_ms.max(0) as u64); + catch("playSine440", || play_sine_inner(440.0, dur)) +} + +fn play_sine_inner(freq_hz: f32, duration: Duration) -> Result { + let host = cpal::default_host(); + let device = host + .default_output_device() + .ok_or_else(|| "no default output device".to_string())?; + let device_name = device.name().unwrap_or_else(|_| "".to_string()); + let cfg = device + .default_output_config() + .map_err(|e| format!("default_output_config: {e}"))?; + info!( + "playback device='{}' sample_rate={} channels={} fmt={:?}", + device_name, + cfg.sample_rate().0, + cfg.channels(), + cfg.sample_format() + ); + + let sample_rate = cfg.sample_rate().0 as f32; + let channels = cfg.channels() as usize; + let total_frames = (duration.as_secs_f32() * sample_rate) as u64; + let phase = Arc::new(Mutex::new(0.0f32)); + let frames_emitted = Arc::new(Mutex::new(0u64)); + let done = Arc::new(Mutex::new(false)); + + let stream_config: cpal::StreamConfig = cfg.clone().into(); + + fn err_fn(e: cpal::StreamError) { + error!("playback stream error: {e}"); + } + + let stream = match cfg.sample_format() { + SampleFormat::F32 => build_play_stream::( + &device, + &stream_config, + sample_rate, + freq_hz, + channels, + total_frames, + phase.clone(), + frames_emitted.clone(), + done.clone(), + err_fn, + )?, + SampleFormat::I16 => build_play_stream::( + &device, + &stream_config, + sample_rate, + freq_hz, + channels, + total_frames, + phase.clone(), + frames_emitted.clone(), + done.clone(), + err_fn, + )?, + SampleFormat::U16 => build_play_stream::( + &device, + &stream_config, + sample_rate, + freq_hz, + channels, + total_frames, + phase.clone(), + frames_emitted.clone(), + done.clone(), + err_fn, + )?, + other => return Err(format!("unsupported sample format: {other:?}")), + }; + + stream + .play() + .map_err(|e| format!("play(): {e}"))?; + + // Wait until either the producer reaches total_frames or a generous timeout. + let timeout = duration + Duration::from_millis(500); + let start = std::time::Instant::now(); + loop { + if *done.lock().unwrap() { + break; + } + if start.elapsed() > timeout { + warn!("playback timeout reached"); + break; + } + std::thread::sleep(Duration::from_millis(20)); + } + drop(stream); + let final_frames = *frames_emitted.lock().unwrap(); + Ok(final_frames) +} + +fn build_play_stream( + device: &cpal::Device, + config: &cpal::StreamConfig, + sample_rate: f32, + freq_hz: f32, + channels: usize, + total_frames: u64, + phase: Arc>, + frames_emitted: Arc>, + done: Arc>, + err_fn: fn(cpal::StreamError), +) -> Result +where + T: SizedSample + FromSineSample + Send + 'static, +{ + let phase_inc = 2.0 * std::f32::consts::PI * freq_hz / sample_rate; + let stream = device + .build_output_stream( + config, + move |out: &mut [T], _| { + let mut ph = phase.lock().unwrap(); + let mut emitted = frames_emitted.lock().unwrap(); + for frame in out.chunks_mut(channels) { + if *emitted >= total_frames { + for s in frame.iter_mut() { + *s = T::from_f32(0.0); + } + *done.lock().unwrap() = true; + } else { + let v = (*ph).sin() * 0.5; + *ph = (*ph + phase_inc) % (2.0 * std::f32::consts::PI); + for s in frame.iter_mut() { + *s = T::from_f32(v); + } + *emitted += 1; + } + } + }, + err_fn, + None, + ) + .map_err(|e| format!("build_output_stream: {e}"))?; + Ok(stream) +} + +pub trait FromSineSample { + fn from_f32(v: f32) -> Self; +} +impl FromSineSample for f32 { + fn from_f32(v: f32) -> Self { + v + } +} +impl FromSineSample for i16 { + fn from_f32(v: f32) -> Self { + (v.clamp(-1.0, 1.0) * f32::from(i16::MAX)) as i16 + } +} +impl FromSineSample for u16 { + fn from_f32(v: f32) -> Self { + let s = (v.clamp(-1.0, 1.0) * f32::from(i16::MAX)) as i32; + (s + i32::from(i16::MAX) + 1) as u16 + } +} + +/// Record `duration_ms` of mono 16-bit PCM to `path` from the default +/// input device. Returns frames captured (>= 0) or -1 on error. +#[no_mangle] +pub extern "system" fn Java_app_chanora_poc_audio_NativeAudio_record1sToFile( + mut env: JNIEnv, + _class: JClass, + path: JString, + duration_ms: jlong, +) -> jlong { + ensure_logging(); + let path_str: String = match env.get_string(&path) { + Ok(s) => s.into(), + Err(e) => { + error!("get_string(path) failed: {e}"); + return -1; + } + }; + let dur = Duration::from_millis(duration_ms.max(0) as u64); + catch("record1sToFile", move || record_inner(&path_str, dur)) +} + +fn record_inner(path: &str, duration: Duration) -> Result { + let host = cpal::default_host(); + let device = host + .default_input_device() + .ok_or_else(|| "no default input device".to_string())?; + let device_name = device.name().unwrap_or_else(|_| "".to_string()); + let cfg = device + .default_input_config() + .map_err(|e| format!("default_input_config: {e}"))?; + info!( + "capture device='{}' sample_rate={} channels={} fmt={:?}", + device_name, + cfg.sample_rate().0, + cfg.channels(), + cfg.sample_format() + ); + let spec = WavSpec { + channels: 1, + sample_rate: cfg.sample_rate().0, + bits_per_sample: 16, + sample_format: HoundSampleFormat::Int, + }; + let writer = Arc::new(Mutex::new(Some( + WavWriter::create(path, spec).map_err(|e| format!("wav create: {e}"))?, + ))); + let frames = Arc::new(Mutex::new(0u64)); + let channels = cfg.channels() as usize; + + let stream_config: cpal::StreamConfig = cfg.clone().into(); + + fn err_fn(e: cpal::StreamError) { + error!("capture stream error: {e}"); + } + + let stream = match cfg.sample_format() { + SampleFormat::F32 => build_capture_stream::( + &device, &stream_config, writer.clone(), frames.clone(), channels, err_fn, + )?, + SampleFormat::I16 => build_capture_stream::( + &device, &stream_config, writer.clone(), frames.clone(), channels, err_fn, + )?, + SampleFormat::U16 => build_capture_stream::( + &device, &stream_config, writer.clone(), frames.clone(), channels, err_fn, + )?, + other => return Err(format!("unsupported sample format: {other:?}")), + }; + + stream + .play() + .map_err(|e| format!("capture play(): {e}"))?; + std::thread::sleep(duration); + drop(stream); + + if let Some(w) = writer.lock().unwrap().take() { + w.finalize().map_err(|e| format!("wav finalize: {e}"))?; + } + let n = *frames.lock().unwrap(); + Ok(n) +} + +fn build_capture_stream( + device: &cpal::Device, + config: &cpal::StreamConfig, + writer: Arc>>>>, + frames: Arc>, + channels: usize, + err_fn: fn(cpal::StreamError), +) -> Result +where + T: SizedSample + ToI16Sample + Send + 'static, +{ + let stream = device + .build_input_stream( + config, + move |data: &[T], _| { + let mut w_guard = writer.lock().unwrap(); + if let Some(w) = w_guard.as_mut() { + let mut n = 0u64; + for frame in data.chunks(channels) { + let mut acc: i32 = 0; + for s in frame { + acc += s.to_i16_sample() as i32; + } + let mono = (acc / frame.len() as i32) as i16; + let _ = w.write_sample(mono); + n += 1; + } + *frames.lock().unwrap() += n; + } + }, + err_fn, + None, + ) + .map_err(|e| format!("build_input_stream: {e}"))?; + Ok(stream) +} + +pub trait ToI16Sample { + fn to_i16_sample(&self) -> i16; +} +impl ToI16Sample for i16 { + fn to_i16_sample(&self) -> i16 { + *self + } +} +impl ToI16Sample for u16 { + fn to_i16_sample(&self) -> i16 { + (i32::from(*self) - i32::from(i16::MAX) - 1) as i16 + } +} +impl ToI16Sample for f32 { + fn to_i16_sample(&self) -> i16 { + let v = (*self * f32::from(i16::MAX)).clamp(f32::from(i16::MIN), f32::from(i16::MAX)); + v as i16 + } +}