Audio handler accepts an AlbumCoverCache via configure() and uses it
to populate MediaItem.artUri with a file:// URI to a locally cached
album cover. Lock screen, Bluetooth car displays, Wear OS, and CarPlay
now show the album cover for the currently playing track instead of
the system's generic music icon.
Flow:
- _toMediaItem stashes album_id in MediaItem.extras
- After setQueueFromTracks pushes the queue + initial mediaItem, fires
_loadArtForCurrentItem async (doesn't block playback)
- Subscribes to _player.currentIndexStream so track advances trigger
the same loader for the new current item
- _loadArtForCurrentItem early-returns if cache is null, no current
item, no album_id, or artUri already set; otherwise calls
cache.getOrFetch and pushes an updated MediaItem with artUri set
- Race guard: if the user skipped to another track while the fetch was
in flight, the result is discarded
Closes the visible "generic music icon on lock screen" gap operator
flagged when first-testing on a real device.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusen
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