4c1ad841e1
Bluetooth: wire existing AudioRouteManager SCO support through both app variants. Replace binary speaker toggle with 3-way route cycling (Earpiece → Speaker → Bluetooth). Tauri side adds JNI bridge functions (start/stop/query SCO, device availability) and Oboe stream restart. Network awareness: integrate Android ConnectivityManager to detect WiFi/cellular transitions and feed them to AdaptiveQualityController via lock-free AtomicU8 signaling. Enables proactive quality downgrade and FEC boost on network handoffs. Build: add --arch flag to build-tauri-android.sh supporting arm64, armv7, or all (separate per-arch APKs for smaller tester binaries). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
99 lines
4.6 KiB
Markdown
99 lines
4.6 KiB
Markdown
# PRD: Bluetooth Audio Routing
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> Phase: Implemented
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> Status: Ready for testing
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> Platforms: Android (native Kotlin app + Tauri desktop app)
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## Problem
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WarzonePhone had `AudioRouteManager.kt` with complete Bluetooth SCO support, but it was disconnected from both UIs. Users with Bluetooth headsets had no way to route call audio to them.
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## Solution
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Wire Bluetooth SCO routing end-to-end through both app variants, replacing the binary speaker toggle with a 3-way audio route cycle: **Earpiece → Speaker → Bluetooth**.
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## Architecture
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```
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┌─────────────────────────────────────────────────────┐
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│ Native Kotlin App (com.wzp) │
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│ │
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│ InCallScreen ──► CallViewModel ──► AudioRouteManager
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│ (Compose UI) cycleAudioRoute() setSpeaker() │
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│ "Ear/Spk/BT" audioRoute Flow setBluetoothSco()
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│ isBluetoothAvailable()
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└─────────────────────────────────────────────────────┘
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┌─────────────────────────────────────────────────────┐
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│ Tauri Desktop App (com.wzp.desktop) │
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│ │
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│ main.ts ──► Tauri Commands ──► android_audio.rs │
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│ cycleAudioRoute() set_bluetooth_sco() JNI calls │
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│ "Ear/Spk/BT" is_bluetooth_available() │
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│ get_audio_route() │
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│ │
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│ After each route change: Oboe stop + start │
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│ (spawn_blocking to avoid stalling tokio) │
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└─────────────────────────────────────────────────────┘
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```
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## Components Modified
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### Native Kotlin App
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| File | Change |
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|------|--------|
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| `CallViewModel.kt` | Added `audioRoute: StateFlow<AudioRoute>`, `cycleAudioRoute()`, wired `onRouteChanged` callback |
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| `InCallScreen.kt` | `ControlRow` now takes `audioRoute: AudioRoute` + `onCycleRoute`, displays Ear/Spk/BT with distinct colors |
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### Tauri App
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| File | Change |
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|------|--------|
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| `android_audio.rs` | Added `start_bluetooth_sco()`, `stop_bluetooth_sco()`, `is_bluetooth_sco_on()`, `is_bluetooth_available()` |
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| `lib.rs` | Added `set_bluetooth_sco`, `is_bluetooth_available`, `get_audio_route` Tauri commands |
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| `main.ts` | Replaced `speakerphoneOn` toggle with `currentAudioRoute` cycling logic |
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| `style.css` | Added `.bt-on` CSS class (blue-400 highlight) |
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## Audio Route Lifecycle
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1. **Call starts** → route defaults to Earpiece
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2. **User taps route button** → cycles to next available route
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3. **Route changes** → AudioManager JNI call + Oboe stream restart (~60-400ms)
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4. **BT device disconnects mid-call** → `AudioDeviceCallback.onAudioDevicesRemoved` fires → auto-fallback to Earpiece/Speaker
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5. **Call ends** → route reset to Earpiece, BT SCO stopped
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## Route Cycling Logic
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```
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Available routes = [Earpiece, Speaker] + [Bluetooth] if SCO device connected
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Tap cycle:
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Earpiece → Speaker → Bluetooth (if available) → Earpiece → ...
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If BT not available:
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Earpiece → Speaker → Earpiece → ...
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```
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## Permissions
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- `BLUETOOTH_CONNECT` (Android 12+) — already in `AndroidManifest.xml`
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- `MODIFY_AUDIO_SETTINGS` — already in manifest
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## Known Limitations
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- **SCO only** — no A2DP (stereo music profile). SCO is correct for VoIP (bidirectional mono).
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- **Deprecated APIs** — `startBluetoothSco()`, `isBluetoothScoOn` are deprecated in API 31+ but still functional. Modern replacement `setCommunicationDevice()` requires API 31 and more complex device enumeration. Since minSdk is 26, deprecated path is correct.
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- **No auto-switch on BT connect** — when a BT device connects mid-call, `onRouteChanged` fires but we don't auto-switch. User must tap the button.
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## Testing
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1. Pair a Bluetooth SCO headset with Android device
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2. Start call → verify Earpiece is default
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3. Tap route → Speaker (audio moves to loudspeaker, button shows "Spk")
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4. Tap route → BT (audio moves to headset, button shows "BT", blue highlight)
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5. Tap route → Earpiece (audio back to earpiece, button shows "Ear")
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6. Disconnect BT mid-call → verify auto-fallback
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7. Verify both app variants work identically
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8. Verify no audio glitches during route transitions
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