Handle surround sound-encoded OGG and FLAC files more gracefully
BLooperZ (rzil on the forums) is currently making scripts that convert the audio from the Full Throttle into a format compatible with ScummVM. One notable hurdle with this is that the cutscene audio is encoded as 5.1 alternative (2 Fronts, Center, LFE, 2 Rears) Ogg Vorbis. When placed as-is next to a zlib-compressed .san file, ScummVM simply treats it as mute (or ignores it?). Whilst this is easily rectified by downmixing to 2.0, I see no reason why this cannot be handled by ScummVM itself, as it is already a pre-mixed audio stream.
What I am proposing is that ScummVM allow up to 8-channel surround sound (including the optional layout metadata) and either output to the audio device based on the file's layout metadata (or the format defaults if none are available) or downmix to 2.0 (preferably as a togglable downmixing mode option).
By a "downmixing mode" option, I mean one that has the option for
(Surround-compatible) Stereo, or
Pass through original.