The Mac dropped the device soon after the first track change: we never
called SpircHandler::notifyAudioReachedPlayback(), so cspot's queue did
not advance and the state sent to Spotify stalled.
- The data callback records a boundary (output write position, track
id) when the track id changes; the session loop (<= 200 ms) calls
notifyAudioReachedPlayback(id) once playback (ring read position)
passes it, and notifyAudioEnded() after DEPLETED once the buffer is
empty. PLAYBACK_START clears boundaries (next data is a new one),
seek/flush drop pending ones.
- audio_ring exposes its write/read frame counters (wrap-safe compare).
- Verified: 10 min on the Mac without a disconnect, every track change
notified ("track audible, Spotify notified"), app shows the playing
track (switches up to ~3-5 s early), 0 underruns.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- main/audio_ring: SPSC ring of interleaved int32 frames in PSRAM
(4 s at 48 kHz stereo), lock-free with acquire/release counters; the
TX pull callback never blocks.
- main/player: source selection from source.mode and the pull callback
for aes67_tx. tone -> the core's PTP-phased 1 kHz tone; off -> silence;
hls/spotify -> ring with 1 s prefill (silence while buffering is not an
underrun; running dry is, and prefills again). Status fields
active_source, source_state, spotify_state, buffer_ms. source config
applies live.
- New source.mode "tone" (validation, UI dropdown, doc) for commissioning.
- Temporary 440 Hz producer in hls mode (until the HLS player exists).
- Verified: tone 999.7 Hz -18 dBFS; off silent; hls 440.0 Hz with max
sample step 60816 (ideal sine 60825, i.e. no discontinuities), buffer
3983 ms, 0 underruns; spotify silent/not implemented.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
bsncubed