DVD-Audio discs carry an Audio Still Video Set (ASVS). An MPEG-2 still
images (cover art, booklet/lyric pages) that the disc associates with
tracks.
A new STREAM_CTRL_GET_STILL returns the still for a given playback time.
demux_disc exposes it as a selectable mpeg2video track and injects the
still as a keyframe at the track's playback time. It changes as playback
crosses track boundaries (and follows onset times when a disc encodes
them).
--dvda-page (with the new STREAM_CTRL_SET_STILL_PAGE) forces a specific
still page instead of the scheduled one. The still state is guarded by
a mutex, runtime page changes arrive from the player thread while the
demuxer thread extracts stills.
Add a dvda:// protocol backed by libdvdread. Audio title sets are
enumerated from the ATS IFOs. Each ATS title is exposed as an mpv
title/edition and its tracks as chapters.
Menus are not supported, they would need full VM implementation, and
libdvdnav currently doesn't support DVD-Audio.
Still images (ASVS) may be supported in the future.
Kacper Michajłow