Files
Psychotoxical-psysonic/src-tauri/src
Psychotoxical 5aac4d4ed0 feat(audio): seekable streaming via RangedHttpSource + instant local playback
Reworks the manual streaming-start path so playback is seekable from the
first frame and hot-cache hits start without a multi-hundred-MB pre-read.

Why
- The legacy AudioStreamReader was a non-seekable ring buffer. Forward
  seeks during streaming let Symphonia consume the buffer through to EOF
  (next song), and backward seeks were silently broken.
- fetch_data() loaded `psysonic-local://` files via tokio::fs::read,
  blocking playback for seconds on hot-cache or offline files (e.g. a
  100+ MB hi-res FLAC) and producing ALSA underruns when the new sink
  swap arrived too late.

What changed
- New RangedHttpSource MediaSource: pre-allocates a Vec<u8> in track
  size, background ranged_download_task fills linearly from offset 0
  with HTTP Range reconnects. is_seekable=true; reads block on data,
  seeks update the cursor only. Picked when the server response carries
  Accept-Ranges: bytes + Content-Length.
- New LocalFileSource MediaSource: thin std::fs::File wrapper used for
  every `psysonic-local://` URL — Symphonia probes the first ~64 KB and
  starts playback before the rest is read.
- audio_play wires both paths through a generic PlayInput::SeekableMedia
  variant so the build_streaming_source pipeline stays single-shape.
- current_is_seekable AtomicBool on AudioEngine: audio_seek short-circuits
  with `not seekable` for the legacy fallback so the frontend restart-
  fallback (playerStore seek catch) engages instead of letting a forward
  seek consume the ring buffer.
- Dev-only [stream] / [seek] eprintln logs (cfg(debug_assertions)) so
  source selection, codec resolution (codec name + lossless flag + bit
  depth + rate + channels), download progress and seek targets are
  visible in the terminal during testing.
- content_type_to_hint now covers wav/wave/opus; URL-derived format
  hints strip the query string first and only accept known audio
  extensions (Subsonic stream URLs have no extension — would otherwise
  latch onto query-param fragments).

Compatibility
- Servers without Accept-Ranges fall back to the existing AudioStreamReader
  path; seek is rejected up-front so the existing restart-fallback runs.
- Radio + audio_chain_preload paths untouched.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-20 01:27:31 +02:00
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