Server-side fixes (stream-server.lisp):
- Add CORS preflight (OPTIONS) request handler for browser crossorigin audio
- AAC clients start from current buffer position instead of burst to avoid
ADTS frame alignment issues that caused browser decode errors
- Upgrade client stream error logging from debug to warn for diagnostics
- Add send-cors-preflight function with proper Access-Control headers
Frontend fixes (stream-player.lisp):
- Rewrite reconnect-stream to reuse existing audio element instead of
creating a new one, preserving browser user gesture context and preventing
NotAllowedError on autoplay after reconnect
- Unify stream config: both curated and shuffle channels use same mount
points (asteroid.mp3/asteroid.aac) since cl-streamer has a single pipeline
- Remove non-existent /asteroid-shuffle.mp3 mount reference that caused
404s and broken pipe cascade when switching to shuffle channel
- Map :low quality to same MP3 mount (asteroid-low.mp3 not yet available)
Note: Channel selector preserved for future multi-stream support.
Recently-played API works correctly; frontend rendering to investigate separately.
- Broadcast buffer: single-producer multi-consumer ring buffer with
per-client read cursors. 32KB burst-on-connect for fast playback.
Never blocks producer (overwrites old data for slow clients).
- Sequential playlist: play-list runs tracks one at a time using
Harmony's on-end callback + condition variable for completion.
- ICY metadata: set-now-playing called on each track change.
- Fixed string vs pathname bug in harmony:play (etypecase mismatch).
- Debug logging for client disconnect diagnosis.
Verified: browser plays shuffled FLAC playlist via 128kbps MP3 stream.
Major changes:
- streaming-drain: Custom drain that captures PCM from Harmony's pack
buffer (raw IEEE 754 floats in unsigned-byte-8 array), converts to
signed-16 PCM via CFFI, encodes to MP3 via LAME, and writes to
stream server's ring buffer
- Fixed ring buffer deadlock: buffer-read/buffer-write held lock then
called buffer-available which tried to acquire same lock. Created
internal %buffer-available/%buffer-free-space without locking.
- Fixed ring buffer zero-length guard for unbound variable in finally
- Fixed sleep duration in drain: was dividing raw byte count by
samplerate, now correctly converts to frames first
- Added flexi-streams wrapper for bivalent HTTP socket I/O
- Exported all public API symbols from cl-streamer package
- Added test-stream.lisp end-to-end test script
Verified: Amon Tobin FLAC -> 128kbps MP3 stream at localhost:8000
file reports: MPEG ADTS, layer III, v1, 128kbps, 44.1kHz, JntStereo
- Architecture document outlining Icecast/Liquidsoap replacement
- Core streaming server with ICY metadata protocol support
- Thread-safe ring buffer for audio data
- Mount point abstraction with metadata updates
- Multi-client connection handling
This is experimental groundwork for integrating with Harmony/cl-mixed
and playlisp/parsector for a pure CL streaming solution.
Glenn Thompson