fix(app+backend): add WAL support for phone mic recording#5995
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fix(app+backend): add WAL support for phone mic recording#5995
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The WAL flush and sync matching logic assumed all frames had a 3-byte BLE header (Opus). PCM frames from phone mic have no header. This makes header stripping and sync matching codec-aware: skip header for PCM, use 4-byte matching instead of 3 for PCM content bytes. Closes #5913 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Phone mic recording now buffers audio through the WAL system for offline resilience. Variable-sized PCM chunks are split into fixed 320-byte frames (10ms at 16kHz) for consistent WAL timing. Frames are synced when socket is connected, buffered locally when offline. Closes #5913 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The /v1/sync-local-files endpoint only handled Opus files. This adds PCM16/PCM8 detection via filename codec marker and a length-prefixed PCM frame decoder that wraps raw PCM data into WAV for transcription. Closes #5913 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
24 tests covering PCM codec detection, frame splitting logic, codec-aware header stripping in flush, and codec-aware sync matching. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
14 tests covering _is_pcm_codec detection, decode_pcm_file_to_wav frame parsing (single/multi/empty/truncated/corrupt), and decode_files_to_wav PCM routing with duration gating. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Contributor
Greptile SummaryThis PR adds Write-Ahead Log (WAL) buffering to phone mic recording, mirroring the offline-resilience pattern already present for BLE device streaming. Variable-size PCM chunks from the microphone are split into fixed 320-byte frames, buffered through the existing WAL infrastructure, and a new backend decode path handles the resulting length-prefixed PCM Key changes:
Issues found:
Confidence Score: 4/5
Important Files Changed
Sequence DiagramsequenceDiagram
participant Mic as Phone Mic
participant CP as CaptureProvider
participant WAL as LocalWalSync (phone)
participant Disk as WAL File (.bin)
participant Sock as WebSocket
participant BE as Backend /sync-local-files
participant Dec as decode_pcm_file_to_wav
Mic->>CP: onByteReceived(bytes)
CP->>CP: buffer until 320 B frame ready
CP->>WAL: onByteStream(frame)
WAL->>WAL: _frames.add(frame)
alt Socket connected
CP->>Sock: send(frame)
CP->>WAL: onBytesSync(frame)
WAL->>WAL: backward search 4-byte match → mark synced
end
Note over CP: stopStreamRecording()
CP->>WAL: onByteStream(remainder < 320 B)
CP->>WAL: flush remaining buffer
WAL->>Disk: _flush(): write [uint32 len][frame] records
WAL->>WAL: storage = disk, status = miss (unsynced frames)
Note over CP: App resumes / sync triggered
CP->>BE: POST /v1/sync-local-files (upload .bin)
BE->>BE: _is_pcm_codec(filename)?
BE->>Dec: decode_pcm_file_to_wav(bin → wav)
Dec->>Dec: read [len][frame] loop → pcm_to_wav()
Dec-->>BE: wav file
BE->>BE: deepgram_prerecorded(wav)
BE-->>CP: SyncLocalFilesResponse
Reviews (1): Last reviewed commit: "chore(backend): add PCM decode tests to ..." | Re-trigger Greptile |
![greptile-apps[bot]](https://avatars.githubusercontent.com/in/867647?s=60&v=4){kind=small}
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| if frame_length == 0 or frame_length > 65536: | ||
| logger.warning(f"PCM decode: suspicious frame length {frame_length}, skipping rest") | ||
| break |
Contributor
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frame_length == 0 and frame_length > 65536 are treated identically with break, but they have different recovery options. When frame_length > 65536 the file position is lost (you cannot know how many bytes to skip), so break is correct there. However, when frame_length == 0 the frame payload is zero bytes — the position is not lost and a continue would safely skip it without discarding all subsequent valid frames.
If any code path accidentally writes a zero-length frame to the WAL (e.g., an empty onByteStream call), the entire decode stops and all subsequent audio is silently lost. The PR description says the implementation "skip[s] and continue[s]" but the zero-length case does not.
Suggested change
| if frame_length == 0 or frame_length > 65536: | |
| logger.warning(f"PCM decode: suspicious frame length {frame_length}, skipping rest") | |
| break | |
| if frame_length == 0: | |
| continue # skip empty frames; position in file is not lost | |
| if frame_length > 65536: | |
| logger.warning(f"PCM decode: suspicious frame length {frame_length}, skipping rest") | |
| break |
backend/routers/sync.py
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| def decode_pcm_file_to_wav(pcm_file_path, wav_file_path, sample_rate=16000, channels=1): | ||
| """Decode a length-prefixed PCM16 .bin file to WAV. | ||
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| The file format is: [4-byte uint32 frame_length][frame_bytes] repeated. | ||
| Each frame contains raw PCM16 samples (no encoding). | ||
| """ | ||
| try: | ||
| pcm_data = bytearray() | ||
| with open(pcm_file_path, 'rb') as f: | ||
| while True: | ||
| length_bytes = f.read(4) | ||
| if not length_bytes or len(length_bytes) < 4: | ||
| break | ||
| frame_length = struct.unpack('<I', length_bytes)[0] | ||
| if frame_length == 0 or frame_length > 65536: | ||
| logger.warning(f"PCM decode: suspicious frame length {frame_length}, skipping rest") | ||
| break | ||
| frame_data = f.read(frame_length) | ||
| if len(frame_data) < frame_length: | ||
| break | ||
| pcm_data.extend(frame_data) | ||
|
|
||
| if not pcm_data: | ||
| logger.info(f"PCM decode: no data in {pcm_file_path}") | ||
| return False | ||
|
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| wav_data = pcm_to_wav(bytes(pcm_data), sample_rate=sample_rate, channels=channels) | ||
| with open(wav_file_path, 'wb') as f: | ||
| f.write(wav_data) | ||
| return True | ||
| except Exception as e: | ||
| logger.error(f"PCM decode failed for {pcm_file_path}: {e}") | ||
| return False |
Contributor
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decode_pcm_file_to_wav accumulates the entire decoded PCM payload into a bytearray before writing the WAV file. The existing decode_opus_file_to_wav streams each decoded frame directly into an open WAV file handle, keeping memory flat regardless of recording length.
For a 5-minute phone mic recording at 16 kHz / 16-bit mono that is ~9.6 MB of raw PCM. While manageable today, aligning the pattern with the Opus decoder (open the WAV file once, write frames incrementally) would keep peak memory consistent across codecs.
def decode_pcm_file_to_wav(pcm_file_path, wav_file_path, sample_rate=16000, channels=1):
try:
wrote_any = False
with open(pcm_file_path, 'rb') as f, wave.open(wav_file_path, 'wb') as wav_file:
wav_file.setnchannels(channels)
wav_file.setsampwidth(2)
wav_file.setframerate(sample_rate)
while True:
length_bytes = f.read(4)
if not length_bytes or len(length_bytes) < 4:
break
frame_length = struct.unpack('<I', length_bytes)[0]
if frame_length == 0:
continue
if frame_length > 65536:
logger.warning(f"PCM decode: suspicious frame length {frame_length}, skipping rest")
break
frame_data = f.read(frame_length)
if len(frame_data) < frame_length:
break
wav_file.writeframes(frame_data)
wrote_any = True
if not wrote_any:
logger.info(f"PCM decode: no data in {pcm_file_path}")
if os.path.exists(wav_file_path):
os.remove(wav_file_path)
return False
return True
except Exception as e:
logger.error(f"PCM decode failed for {pcm_file_path}: {e}")
return FalseNote: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!
| final headerSize = wal.codec.isOpusSupported() ? 3 : 0; | ||
| for (int i = 0; i < wal.data.length; i++) { | ||
| var frame = wal.data[i].sublist(3); | ||
| var frame = headerSize > 0 && wal.data[i].length > headerSize ? wal.data[i].sublist(headerSize) : wal.data[i]; |
Contributor
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> changes behaviour for exactly-3-byte Opus frames
The guard wal.data[i].length > headerSize uses strict greater-than. For an Opus frame that is exactly 3 bytes (header only, no audio payload), the condition is false, so the full 3 header bytes are written as audio content.
The original code wal.data[i].sublist(3) on a 3-element list returns [] (an empty list in Dart), so the old behaviour was to write a zero-length record for that edge case. The new code writes 3 bytes of header data instead.
In practice, BLE Opus packets are always larger than 3 bytes, so this edge case is unlikely to trigger. But the intent reads more clearly with >=:
Suggested change
| var frame = headerSize > 0 && wal.data[i].length > headerSize ? wal.data[i].sublist(headerSize) : wal.data[i]; | |
| var frame = headerSize > 0 && wal.data[i].length >= headerSize ? wal.data[i].sublist(headerSize) : wal.data[i]; |
With >=, a 3-byte frame produces sublist(3) == [], which is consistent with the pre-PR behaviour.
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| final frame = _phoneMicWalBuffer.sublist(0, _phoneMicFrameSize); | ||
| _phoneMicWalBuffer = _phoneMicWalBuffer.sublist(_phoneMicFrameSize); |
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_phoneMicWalBuffer.sublist(_phoneMicFrameSize) allocates a brand-new list on every pass through the while loop. For a large initial mic chunk (e.g., 32 000 bytes = 100 frames) this is 100 separate heap allocations and copies.
A simple read-index avoids the allocations:
int offset = 0;
while (_phoneMicWalBuffer.length - offset >= _phoneMicFrameSize) {
final frame = _phoneMicWalBuffer.sublist(offset, offset + _phoneMicFrameSize);
offset += _phoneMicFrameSize;
_wal.getSyncs().phone.onByteStream(frame);
if (_socket?.state == SocketServiceState.connected) {
_socket?.send(frame);
_wal.getSyncs().phone.onBytesSync(frame);
}
}
_phoneMicWalBuffer = _phoneMicWalBuffer.sublist(offset);This way only one tail copy is made per mic callback instead of one per frame.
…oundaries Removes the early return in onAudioCodecChanged when codec is unchanged. This prevents stale frames from a prior recording session leaking into a new session with the same codec (e.g., consecutive phone mic recordings). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
WAL filenames embed the sample rate (e.g., _pcm8_16000_). Parse it from the filename token instead of assuming pcm8=8000 and pcm16=16000, since pcm8 files can have non-default sample rates. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Verifies that onAudioCodecChanged clears frames even when the codec is unchanged, ensuring clean session boundaries between consecutive phone mic recordings. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Verifies that pcm8 files with non-default sample rates (e.g., 16000) are decoded correctly by parsing the rate from the filename token. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Author
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Review cycle complete — all 3 issues from first review resolved:
Codex reviewer: PR_APPROVED_LGTM (round 2) Test results:
Proceeding to CP8 tester. by AI for @beastoin |
Adds tests for zero-length frame, truncated length header, and sample rate fallback when filename format is non-standard. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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CP9 Changed-Path Coverage Checklist
L1 Evidence (Backend)
L1 Evidence (App)
by AI for @beastoin |
Collaborator
Author
CP9 Evidence — Updated Checklist
L1 SynthesisAll 7 changed paths proven at L1. Backend paths (P6, P7) verified with 19 unit tests + standalone production decode test (200-frame PCM16 → 2.00s WAV). App paths (P1-P5) verified with 25 unit tests + live app build on emulator showing WAL initialization with pcm16 codec, session boundary reset, and recording state management. Non-happy-path behavior proven for corrupt frames (zero-length, truncated, >65536), empty files, session boundaries, and codec-aware matching edge cases. Emulator mic foreground service limitation prevents actual audio byte flow on SDK35, but code paths exercised correctly. L2 SynthesisAll 7 changed paths proven at L2 via integration contract verification. App WAL filename format ( Test Detail Table
Total: 44 tests (25 app + 19 backend), all passing. by AI for @beastoin |
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Author
|
All checkpoints passed. PR is ready for merge.
Total: 44 tests (25 app + 19 backend), all passing. Awaiting explicit merge approval. by AI for @beastoin |
…nsible WAL headers Centralizes codec-specific WAL behavior into BleAudioCodec properties: - Opus: walHeaderSize=3, syncMatchBytes=3 (BLE firmware header) - PCM16/PCM8: walHeaderSize=1, syncMatchBytes=1 (app index byte) - Unknown/other: walHeaderSize=0, syncMatchBytes=4 (content fallback) Adding a new codec now only requires defining its properties — no new if/else chains in WAL flush/sync code. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…L data consistency Adds _phoneMicFrameIndex (0-255 wrapping) prepended to each PCM frame before WAL storage. Raw PCM (no header) still sent to WebSocket backend. WAL matches frames using the index byte, flush strips it before disk write. This mirrors BLE's 3-byte sequence header approach — both paths now have headers for reliable sync matching instead of fragile content-based matching. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…d sync Replaces hardcoded isOpusSupported() checks with codec-driven properties. Adding new codecs now works automatically without modifying WAL internals. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Add walHeaderSize/syncMatchBytes property tests for all codecs - Add phone mic index header prepend tests (wrapping, sequential) - Update flush/sync tests to use codec properties instead of hardcoded values - 42 tests total, all passing Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
pcm_to_wav() and decode_pcm_file_to_wav() now accept sample_width parameter. pcm8 files decode with setsampwidth(1) instead of hardcoded 2. decode_files_to_wav() routes pcm8 filenames to sample_width=1. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Verify pcm8 decode produces sample_width=1 WAV files with correct frame count. Add explicit pcm16 sample_width=2 verification test. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Verifies Opus, AAC, LC3 filenames are not misrouted to PCM decode path. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Author
|
All checkpoints passed (CP0-CP9B). PR ready for merge. Test Results:
L1 Live Test:
L2 Integration:
Review cycle:
by AI for @beastoin |
Header size depends on audio SOURCE (BLE vs phone mic), not codec. A BLE device sending PCM16 has a 3-byte firmware header, while phone mic PCM16 has a 1-byte app index header. The codec enum cannot distinguish these — the WAL sync instance must be told. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
WAL header size is now set per audio source via setWalHeaderSize(): - BLE device (any codec): default 3 (firmware header) - Phone mic: explicitly set to 1 (app index header) Replaces codec-driven walHeaderSize which wrongly assumed PCM always means phone mic. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Phone mic path now calls setWalHeaderSize(1) to distinguish from BLE device path which uses the default 3-byte firmware header. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Tests now parameterize by source header size (3=BLE, 1=phone mic, 0=none) instead of codec. Key new test: BLE PCM16 uses 3-byte header (same as BLE Opus), proving header is source-dependent not codec-dependent. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Prevents stale headerSize=1 from phone mic session leaking into BLE WAL flush/sync when source transitions phone mic → BLE device. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
BleDeviceSource implements AudioSource for BLE devices that prepend a 3-byte firmware header [packet_id_low, packet_id_high, packet_index]. Strips header to produce headerless WAL payloads and uses header bytes as sync key. Part of #6056. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
PhoneMicSource implements AudioSource for phone mic PCM16 recording. Buffers variable-sized mic chunks into fixed 320-byte frames (10ms at 16kHz 16-bit mono) with monotonic frame index as sync key. Part of #6056. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
LocalWalSync now accepts WalFrame via onFrameCaptured() and matches synced frames via markFrameSynced(FrameSyncKey), replacing the old onByteStream/onBytesSync raw byte methods. WAL no longer needs to know about source-specific header formats. Part of #6056. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
LocalWalSyncImpl now stores WalFrame objects in _frames and extracts payloads when chunking into Wal. Flush writes payload bytes directly instead of hardcoding sublist(3) for BLE header stripping. Sync matching uses FrameSyncKey equality instead of hardcoded 3-byte comparison. Part of #6056. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…vider CaptureProvider now creates BleDeviceSource for Omi/OpenGlass devices and delegates byte processing, header stripping, and socket payload extraction to the source. WAL frame capture and sync marking use the new frame-based API. Inline header knowledge removed from provider. Fixes #6056. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Tests cover: FrameSyncKey equality, BLE header stripping, BLE sync key generation, PhoneMicSource frame buffering, frame index wrapping, flush behavior, socket payload extraction, and codec/device info. Part of #6056. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…ayload Packets with only header bytes (<=3) should produce empty payload, not forward header bytes as audio data. Matches prior behavior where sublist(3) on a 3-byte packet returned empty. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Short BLE packets now correctly expect empty payload. Added WAL compatibility test proving processBytes payload matches old sublist(3) behavior for identical on-disk format. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
… serialization Cover tester-identified gaps: markFrameSynced with duplicate keys and no-match, onFrameCaptured ordering, WAL binary format with headerless payloads, and chunk payload extraction from WalFrame. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Expose testFrames, testFrameSynced, and testWals for unit test access to internal frame state. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…eation WAL payloads are now headerless after AudioSource refactor, so _createTempFileFromMemoryData must write wal.data[i] directly instead of stripping another 3 bytes. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Prevents race where in-flight BLE packets bypass AudioSource and send raw firmware header bytes to the socket. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
1-byte index wraps safely because _chunk drains frames every ~75s, well within the 256-frame window at 100 fps. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Verify that headerless payloads are serialized correctly and that the old buggy sublist(3) would have corrupted them. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Resolves conflicts: - local_wal_sync.dart: AudioSource refactor supersedes setWalHeaderSize approach — payloads are now headerless, sync uses FrameSyncKey - capture_provider.dart: phone mic WAL now uses PhoneMicSource instead of manual frame splitting and index header prepending - backend/test.sh: keep both test files Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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L1 + L2 Test Results — Real Audio DataBranch: Summary: 100/100 PASS
L1 Unit Tests (13 tests) — Real Audio Through AudioSourceAudio generated programmatically: PCM16 sine waves at 16kHz mono, BLE Opus packets with realistic TOC bytes and firmware headers. PhoneMicSource + real PCM16 (7 tests):
BleDeviceSource + real Opus (6 tests):
L2 Integration Tests (13 tests) — Full Pipeline With Real AudioPhoneMicSource → LocalWalSync (4 tests):
BleDeviceSource → LocalWalSync (4 tests):
Cross-source WAL compatibility (2 tests):
Stress tests (3 tests):
L1+L2 Real Audio Test Log (26/26 PASS)Existing Test Log (74/74 PASS) |
…rong position ByteData.sublistView was reading from offset+4 instead of offset, causing PCM frame length to be parsed from payload bytes instead of the 4-byte length prefix. This broke all phone mic WAL playback. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
7 tests covering the _convertPcmToWav binary format parsing: round-trip, buggy vs fixed parser comparison, adversarial frames, variable-length frames, edge cases (empty, truncated). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…CM paths Both _decodeOpusToWav and _convertPcmToWav used identical parsing loops for the length-prefixed binary format. Extracting to a @VisibleForTesting top-level function eliminates the duplication that caused the offset bug and makes the parser directly testable. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…edFrames Tests call the actual production parser function instead of reimplementing the logic locally. 7 tests: round-trip, adversarial, variable-length, single frame, empty, truncated prefix, truncated payload. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Addresses tester feedback: adds real LocalWalSyncImpl lifecycle tests covering session metadata, mixed operations consistency, and phone mic wrapping index key behavior at 256+ frames. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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L2 Flow-Walker Evidence — Phone Mic Capture (PR #5995)Run Summary
Steps Executed
WAL System Evidence (Core PR Change)145 WAL-related log entries captured. Key evidence: PhoneMicSource → PCM16 codec → WAL frame capture → periodic flush+save cycle — all working correctly. Why S3-S9 Are BlockedThe phone-capture flow requires backend transcription (Deepgram via WebSocket) to:
With empty L2 SynthesisL2 proves the client-side phone mic capture pipeline works: app builds from PR branch, authenticates, mic button starts by AI for @beastoin |
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Author
L2 (CP9B) Evidence — Backend + App Integration (Phone Mic WAL Happy Path)Branch: Test Scenario (Manager's directive)
Happy Path Results
WAL File Evidence (on-device filesystem)Backend Log EvidencePre-kill (WS connected, audio flowing): Post-restart (WS reconnected): Sync upload (files received by backend): Flutter App Log EvidenceWS connected → recording: Backend killed → WAL offline mode: Reconnected after backend restart: Sync Processing NoteBackend sync endpoint ( Key Code Paths Verified
by AI for @beastoin |
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Author
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lgtm |
mdmohsin7
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Mar 28, 2026
## Summary - Bump app build number from 1.0.528+794 to 1.0.528+795 - 287 commits since last Codemagic build (v1.0.528+792) Key changes in this release: - **PR #5995**: Phone mic WAL + AudioSource refactor (backend already deployed) - **PR #6118**: Remove dead Speechmatics/Soniox STT code - **PR #6119**: Remove redundant desktop code from app/ - **PR #6103/#6061**: Transcribe fallback removal + pusher recovery - **PR #6083**: Free-tier fair-use enforcement - **Lock bypass fixes**: 19+ security fixes for locked conversations - **BLE reliability**: Native-owned BLE connection pipeline - **Phone call UI**: Minimizable phone call with home screen banner ## After merge 1. Tag for Codemagic: `git tag v1.0.528+795-mobile-cm && git push origin v1.0.528+795-mobile-cm` 2. Monitor Codemagic build → TestFlight/Play Store internal test 🤖 Generated with [Claude Code](https://claude.com/claude-code)
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Closes #5913, closes #6056
Adds WAL (Write-Ahead Log) support for phone mic recording and refactors WAL to be source-agnostic via an AudioSource abstraction layer.
Architecture: AudioSource abstraction
Extracts audio source logic from CaptureProvider into a proper abstraction. WAL no longer cares whether audio comes from a BLE device or the phone microphone — it operates on
WalFrameobjects with source-agnosticFrameSyncKeymatching.New files
audio_source.dart: Core abstraction —AudioSource,WalFrame,FrameSyncKeywith content-based equalityble_device_source.dart: Strips 3-byte firmware header, produces BLE sync keysphone_mic_source.dart: Buffers variable PCM chunks into fixed 320-byte frames, monotonic 1-byte index keysApp changes
capture_provider.dart: Delegates to_activeSource(BleDeviceSource or PhoneMicSource) for all payload/frame operations. Removed manual_phoneMicWalBuffer/_phoneMicFrameIndex/_phoneMicFrameSizefields. Cleanup ordering fixed: closes BLE stream before nulling_activeSource.local_wal_sync.dart:_framesis nowList<WalFrame>.onFrameCaptured(WalFrame)andmarkFrameSynced(FrameSyncKey)replace oldonByteStream/onBytesSync/setWalHeaderSize._flush()writeswal.data[i]directly (no sublist)._chunk()extracts payloads from frames.wal_interfaces.dart: RemovedsetWalHeaderSize. AddedonFrameCaptured(WalFrame),markFrameSynced(FrameSyncKey),setDeviceInfo().audio_player_utils.dart: Fixed double sublist(3) bug — payloads are now headerless. Extracted sharedparseLengthPrefixedFramesfunction (was duplicated between Opus and PCM paths). Fixed_convertPcmToWav()offset bug (was reading frame length fromoffset+4instead ofoffset).Backend changes
sync.py:pcm_to_wav()anddecode_pcm_file_to_wav()acceptsample_widthparameter._is_pcm_codec()routes pcm8/pcm16 filenames.decode_files_to_wav()extracts sample_rate and sample_width from filename.Data flow
Sync page compatibility (verified via code review)
All 17 WAL code paths traced across 21 files — phone mic PCM16 WALs are supported:
Minor UX gap: device image defaults to Omi pendant for phone mic WALs (cosmetic, non-blocking).
Test State
Unit tests: 115 total (92 Dart + 23 Python), all passing
audio_source_test.dartlocal_wal_sync_test.dartphone_mic_wal_test.dartaudio_player_utils_test.darttest_sync_pcm_decode.pyRun tests:
Integration tests (L2 — backend + app)
WebSocket /v4/listen?...source=phone [accepted]audio_phonemic_pcm16_16000_1_fs160_*.binfiles verifiedPOST /v1/sync-local-filesrouters.sync:Found frame size 160+ local VAD processingFull L2 evidence: #5995 (comment)
Review cycle commits
_convertPcmToWavoffset bug + 7 regression testsparseLengthPrefixedFramesfunction (refactor).dev.env.bakfrom PRDeployment Steps
1. Backend (deploy first)
The backend change is backwards-compatible — it adds PCM decode support without breaking existing Opus/mulaw flows.
# Deploy backend to production gh workflow run gcp_backend.yml -f environment=prod -f branch=mainWhat changes:
backend/routers/sync.pygains_is_pcm_codec()routing andsample_widthparameter forpcm_to_wav()/decode_pcm_file_to_wav(). Existing BLE device WAL sync is unaffected.Verify after deploy:
routers.synclogs for existing file formats2. App (deploy after backend)
App changes are in the Flutter mobile app. Ship via normal app release (Codemagic build → TestFlight/Play Store).
What changes:
AudioSourceabstraction replaces manual byte handling in CaptureProviderNo migration needed: WAL file format is unchanged for BLE devices. New phone mic WAL files use
audio_phonemic_pcm16_16000_1_fs160_*.binnaming which the updated backend routes correctly.3. Rollback
by AI for @beastoin