- Add taglib dependency to cl-streamer/harmony system
- Add read-audio-metadata: reads artist/title/album from FLAC/MP3 tags
- Add format-display-title: builds 'Artist - Title' from tags, falls back to filename
- Add update-all-mounts-metadata: updates ICY metadata on all mount points
- Defer metadata update during crossfade until fade completes (listeners hear correct track)
- Fix play-list wait loop: was nested inside crossfade conditional, first track never waited
- Remove filename-derived :title from test playlist (taglib reads real tags now)
- Fix FDK-AAC C shim: use proper OUT_BITSTREAM_DATA=3 constant and INT types
- Add frame-aligned PCM accumulation buffer to AAC encoder for clean output
- Add fdkaac_encode and fdkaac_close to C shim (all FDK-AAC calls in C)
- Implement crossfade between tracks (3s overlap, 2s fade-in/out)
- Tune buffer: 90% drain sleep for encoding headroom, 64KB burst-on-connect
- Add FFI bindings for new shim functions
- Rewrite README.org with full architecture docs and integration plan
- 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
- harmony-backend.lisp: Audio pipeline connecting Harmony to encoders
- Uses :dummy drain to capture PCM without audio output
- Reads from packer bip-buffer via request-read/finish-read API
- Encodes PCM to MP3 via LAME and feeds to stream server
All three systems compile cleanly:
cl-streamer, cl-streamer/encoder, cl-streamer/harmony
- 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