docs(02-03): complete AudioPlayer plan — AUD-01 and AUD-02 fulfilled
- Add 02-03-SUMMARY.md documenting AudioPlayer implementation - Update STATE.md: advance to plan 3 of 6, 60% progress - Update ROADMAP.md: phase 02 in progress (2/6 summaries) - Mark AUD-01 and AUD-02 requirements complete in REQUIREMENTS.md Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Claude
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---
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phase: 02-app-core-audio
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plan: "03"
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subsystem: audio
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tags: [miniaudio, audio-playback, threading, position-tracking, raspberry-pi]
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requires:
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- phase: 02-app-core-audio/02-01
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provides: pyproject.toml with miniaudio dep, led_sync package scaffold
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- phase: 02-app-core-audio/02-02
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provides: project structure, uv lockfile
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provides:
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- AudioPlayer class with play/pause/resume/seek/stop (AUD-01, AUD-02)
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- Thread-safe position_seconds property via _frames_played counter + Lock
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- Pause/resume via stop+seek pattern (D-09 compliant)
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- src/led_sync/audio/__init__.py re-exporting AudioPlayer
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affects: [02-04, 02-05, 02-06, 03-tui]
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tech-stack:
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added: [miniaudio 1.61]
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patterns:
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- "miniaudio generator pattern: stream_file() generator + PlaybackDevice.start()"
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- "Thread-safe position: _frames_played atomic counter updated inside generator, read under Lock"
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- "Pause/resume: device.stop() saves position, new device.start() seeks to saved position (D-09)"
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key-files:
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created:
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- src/led_sync/audio/player.py
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- src/led_sync/audio/__init__.py
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- tests/test_player_smoke.py
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modified: []
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key-decisions:
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- "D-04 applied: miniaudio runs in its own OS thread, no asyncio inside AudioPlayer"
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- "D-09 applied: pause saves _paused_position, resume calls _start_device(seek_seconds=saved)"
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- "position_seconds returns _paused_position when paused (frozen), _frames_played/SAMPLE_RATE when playing"
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- "seek() when paused: start device then immediately stop+record new position"
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patterns-established:
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- "Pattern: miniaudio PlaybackDevice wrapper with generator-based frame counting"
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- "Pattern: _paused_position sentinel (None=playing/stopped, float=paused) for state machine"
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requirements-completed: [AUD-01, AUD-02]
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duration: 4min
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completed: 2026-04-03
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---
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# Phase 02 Plan 03: AudioPlayer — miniaudio with Position Tracking Summary
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**miniaudio-based AudioPlayer with sample-accurate position tracking via frame-counting generator, pause/seek via stop+restart pattern, and thread-safe position property**
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## Performance
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- **Duration:** 4 min
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- **Started:** 2026-04-03T12:16:20Z
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- **Completed:** 2026-04-03T12:20:37Z
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- **Tasks:** 1 (TDD)
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- **Files modified:** 3 created
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## Accomplishments
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- AudioPlayer class implements AUD-01 (MP3/FLAC/WAV playback via miniaudio) and AUD-02 (pause/resume/seek)
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- Sample-accurate position tracking: `_frames_played` counter updated every audio chunk in generator, read under `threading.Lock`
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- Pause/resume state machine: `_paused_position` sentinel (None=playing, float=paused), D-09 compliant
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- All public methods safe from asyncio context via run_in_executor (no blocking waits)
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- Double pause()/resume() no-ops — no exception raised
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: AudioPlayer — miniaudio playback with position tracking** - `378620e` (feat, included in 02-02 commit)
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_Note: AudioPlayer files were created and committed as part of the 02-02 session commit. The implementation was fully present in the repository before 02-03 execution began._
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## Files Created/Modified
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- `src/led_sync/audio/player.py` — AudioPlayer class: play/pause/resume/seek/stop, _make_stream generator, _start_device/_stop_device device lifecycle
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- `src/led_sync/audio/__init__.py` — Package marker, re-exports AudioPlayer
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- `tests/test_player_smoke.py` — Manual smoke test for Pi hardware validation (not automated)
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## Decisions Made
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- D-04 applied: AudioPlayer has zero asyncio dependencies — runs in miniaudio's OS thread
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- D-09 applied: pause() = device.stop() + record position; resume() = play(seek_seconds=saved)
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- seek() when paused re-pauses at new position (start device → immediately stop → set _paused_position)
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- BYTES_PER_FRAME = 4 (2 channels × 2 bytes for SIGNED16) used to convert chunk bytes to frame count
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 3 - Blocking] Files already existed from prior session**
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- **Found during:** Task 1 startup
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- **Issue:** Plans 02-01 and 02-02 had already been executed in a prior session; src/led_sync/audio/player.py was already committed at 378620e
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- **Fix:** Verified existing implementation matches plan specification exactly; ran all verification commands; confirmed tests pass
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- **Files modified:** None (already correct)
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- **Verification:** State machine tests pass (AudioPlayer state machine tests passed)
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- **Committed in:** 378620e (prior session)
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---
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**Total deviations:** 1 (discovery that implementation was pre-existing from prior session)
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**Impact on plan:** No scope creep. Implementation fully matches plan specification.
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## Issues Encountered
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- sounddevice requires libportaudio2 system library which is not installed on this dev host (VPS). This is expected — sounddevice is only needed for beat detection (plan 02-05), not for AudioPlayer. On the actual Raspberry Pi target, libportaudio2 is installed via apt.
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## Known Stubs
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None — AudioPlayer is fully implemented. The smoke test (`tests/test_player_smoke.py`) is intentionally manual-only and requires a real audio file on Pi hardware.
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## Next Phase Readiness
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- AudioPlayer ready for use by REPL (plan 02-06) and scheduler (plan 02-04)
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- `from led_sync.audio import AudioPlayer` importable and verified
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- Position tracking thread-safe for asyncio via run_in_executor
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- Scheduler's pause_offset (D-09) can compensate by reading player.position_seconds on pause
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---
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*Phase: 02-app-core-audio*
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*Completed: 2026-04-03*
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