300ea66d13
Reflects the current reality: setCommunicationDevice API 31+, deferred MODE_IN_COMMUNICATION, BT-mode Oboe (bt_active flag), per-arch builds, Hangup call_id fix, and network monitoring integration. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
106 lines
5.5 KiB
Markdown
106 lines
5.5 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` | `setCommunicationDevice()` (API 31+) with `startBluetoothSco()` fallback; `set_audio_mode_communication/normal()` for call lifecycle |
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| `lib.rs` | `set_bluetooth_sco`, `is_bluetooth_available`, `get_audio_route` Tauri commands; SCO polling + 500ms route delay |
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| `wzp_native.rs` | Added `audio_start_bt()` for BT-mode Oboe (skips 48kHz + VoiceCommunication preset) |
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| `oboe_bridge.cpp` | `bt_active` flag: capture skips sample rate + input preset; playout uses `Usage::Media`; both use `Shared` mode + `SampleRateConversionQuality::Best` |
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| `engine.rs` | `set_audio_mode_communication()` before `audio_start()`; `set_audio_mode_normal()` after `audio_stop()` |
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| `MainActivity.kt` | Removed `MODE_IN_COMMUNICATION` from app launch — deferred to call start |
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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. **App launch** → `MODE_NORMAL` (other apps' audio unaffected — BT A2DP music keeps playing)
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2. **Call starts** → `MODE_IN_COMMUNICATION` set via JNI, Oboe opens with earpiece routing
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3. **User taps route button** → cycles to next available route
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4. **Route changes** → `setCommunicationDevice()` (API 31+) + Oboe restart in BT mode or normal mode
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5. **BT device disconnects mid-call** → `AudioDeviceCallback.onAudioDevicesRemoved` fires → auto-fallback to Earpiece/Speaker
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6. **Call ends** → route reset, `MODE_NORMAL` restored
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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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- **API 31+ required for modern path** — `setCommunicationDevice()` is the primary BT routing API. Fallback to deprecated `startBluetoothSco()` on API < 31 (untested).
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- **BT SCO capture at 8/16kHz** — Oboe resamples to 48kHz via `SampleRateConversionQuality::Best`. Quality is inherently limited by the SCO codec (CVSD at 8kHz or mSBC at 16kHz).
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- **No auto-switch on BT connect** — when a BT device connects mid-call, user must tap the route button.
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- **500ms route switch delay** — after `setCommunicationDevice()` returns, the audio policy needs time to apply the bt-sco route. We wait 500ms before restarting Oboe.
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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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