The device is on a TV, so it should show the cover. play_media now carries
thumb=, which pychromecast folds into metadata["images"] — the field the
receiver paints full-screen. Verified against the real device: it fetches
both the audio and the artwork URL from us on every track change.
Album art lives in the audio file's tags rather than as a file of its own,
so TrackServer tokens now resolve to an _Asset that is either a path or a
blob held in memory. Audio and art get separate eviction rings so a cover
can't push out the previous track's audio while the device is still
fetching it; Range and HEAD work on both.
The image type is sniffed from the cover's magic bytes rather than trusted
from the tag — ID3 APIC mimes are routinely wrong or blank, and the
receiver silently drops an image whose declared type doesn't match its
content. Anything unrecognized is treated as "no cover".
Best-effort throughout: no art, junk where the art should be, or an
unreadable file all just play without a cover rather than failing the
load. Also sends albumArtist and trackNumber in the metadata.
tests/test_round29.py: 74 tests; 447 pass overall.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
travandClaude Opus 5
6c746c3330