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feat: qbz-1 streaming, gapless prefetch, accurate scrobbling, Range-seek

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Port proven playback architecture from qbqt fork:
- Bounded VecDeque buffer with condvar backpressure (4MB cap)
- decrypt_and_extract_frames for clean FLAC frame extraction from ISOBMFF
- Cancel+restart seeking with sub-segment sample skipping
- start_prefetch / QueueNext for gapless transitions with pre-started downloads
- track_transitioned signaling for scrobbler during gapless playback
- Range-request HTTP seeking for non-segmented (MP3) tracks
- OnceLock HTTP client singleton with cancel-aware chunked downloads
- Accumulated listening time scrobbling (prevents false scrobbles from seeking)
- Array-format Last.fm scrobble params (artist[0], track[0], etc.)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
joren
2026-03-30 20:12:23 +02:00
parent 6c8d032ce9
commit 70810bd4b1
16 changed files with 1539 additions and 382 deletions
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6
rust/include/qobuz_backend.h
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@@ -75,17 +75,13 @@ uint64_t qobuz_backend_get_duration(const QobuzBackendOpaque *backend);
uint8_t qobuz_backend_get_volume(const QobuzBackendOpaque *backend);
int qobuz_backend_get_state(const QobuzBackendOpaque *backend);
int qobuz_backend_take_track_finished(QobuzBackendOpaque *backend);
int qobuz_backend_take_track_transitioned(QobuzBackendOpaque *backend);
// ReplayGain / Gapless
void qobuz_backend_set_replaygain(QobuzBackendOpaque *backend, bool enabled);
void qobuz_backend_set_gapless(QobuzBackendOpaque *backend, bool enabled);
void qobuz_backend_prefetch_track(QobuzBackendOpaque *backend, int64_t track_id, int32_t format_id);
// Visualizer PCM access
uint32_t qobuz_backend_viz_read(QobuzBackendOpaque *backend, float *buf, uint32_t max_samples);
uint32_t qobuz_backend_viz_sample_rate(const QobuzBackendOpaque *backend);
uint32_t qobuz_backend_viz_channels(const QobuzBackendOpaque *backend);
// Artist releases (auto-paginates to fetch all)
void qobuz_backend_get_artist_releases(QobuzBackendOpaque *backend, int64_t artist_id, const char *release_type, uint32_t limit, uint32_t offset);