Palash DebnathandClaude Opus 4.8
7d7d07c8fc
Completes Action 8: dictate-over-playback echo cancellation now works
end-to-end, gated behind a new off-by-default 'aecEnabled' pref so the
standard dictation + playback paths are untouched when off.
- utils/aec/{pcm,farEndBus,micCapture,playbackTap}.js + public/aec-worklet.js:
AudioWorklet captures the mic as raw int16 PCM; a player tap routes playback
output through Web Audio to a singleton far-end bus. Pure framing/encode
helpers are unit-tested.
- CaptureWidget: when aecEnabled, opens /ws/transcribe?aec=1, streams tagged
PCM (0x00 mic / 0x01 far-end) instead of MediaRecorder/WebM. Default path
unchanged; no POST fallback in AEC mode (the WS is the sole channel).
- WaveformPlayer: while actually playing AND aecEnabled, taps its decoded
output as the echo reference. Gated on isPlaying so only the one active
player holds an AudioContext (well under the browser cap); audio stays
audible (source always reconnected to destination).
- Settings → Capture: AecPanel toggle. prefsSlice: aecEnabled (persisted).
Runtime-unverifiable here (jsdom has no Web Audio); needs in-app testing in
the Tauri shell. 7 new pure-helper tests; full vitest (319) + vite build green.
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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