- AudioTapProcessor: shared MTAudioProcessingTap with lock-free PCM ring buffer
- Pre-allocated vDSP FFT (1024-sample, Hann window, log-frequency 30-band output)
- Zero per-frame heap allocation in FFT path
- Shared tap serves both FFT visualizer and Shazam simultaneously
Fixes (blockers for tap to work):
- radioGoLive/radioSeekBack now update self.playerItem (was orphaned)
- Tap reinstalled on every AVPlayerItem swap (seek, live, station change)
- Tap removed on background, reinstalled on foreground
- Tap removed on radio→music transition
Shazam rework:
- Uses shared AudioTapProcessor instead of creating its own tap
- Fixes tap conflict where Shazam overwrote FFT audioMix
- 500ms wait for tapPrepare callback (sourceFormat timing race)
- Fixed pre-existing bug: stopAll() audio session never restored after mic fallback
Debug capture:
- Capture Audio Tap button in Visualizer Settings
- Records 5s of raw tap PCM as playable WAV file
- Uses actual stream sample rate (not hardcoded 44100)
- Share sheet via Notification pattern (survives view dismiss)
- Spinner auto-resets on appear if capture interrupted by background
Also includes from main branch:
- Edit History UI, batch undo, companion API 7-bug fix
- Recently Played tab, Discover section, Play Queue sync, Share links"
Dallas Groot
3385b88270