`PlaybackTicket::CdTrack { device, start_lsn, sectors }`. No path-shaped
variant fits: a track on a disc is a device plus a sector RANGE, and the bytes
only exist while that medium is in that drive. `File` and `DsdFile` would both
hand it to something that opens it.
`LocalSource::playback` answers it FIRST, before the extension tests, through
`CdRef::is_cd_path` — the encoder's own predicate rather than a second
`starts_with` written out at the call site. That is deliberate: a hand-copied
prefix list is exactly how six bugs of the same shape shipped on 2026-08-20,
and a fold to a valid-looking answer is invisible to every test.
The match in `audible_qt::play_ticket` is exhaustive on purpose, so the new
variant broke the build until somebody decided what a CD means. It now means:
read the sectors and feed them as 44.1 kHz / 16-bit / stereo PCM.
`EphemeralLibraryState::open_tracks` installs a track list that did not come
from scanning a directory. `open_folder` cannot serve a disc — it takes a
`&Path`, rejects anything that is not a real directory, and derives every
field by reading files off a filesystem. A disc has no filesystem to read.
Ids come from the same synthetic range, so every playback caller keeps routing
them without knowing a disc exists.
cc
vicrodh
3ba476b43c