[MPlayer-dev-eng] [PATCH] DVD subpicture/audio stream mapping

[Lehel Bernadt]

Hi all!

I had to realise that mplayer entirely ignores the logical mapping info 
between the various dvd audio/subtitle tracks and the corresponding mpeg 
streams, and does an identity mapping instead.
But I guess it's because libdvdread lacks the support for it :)
So here is the patch that fixes this shortcoming...

Some background info:
The audio and subtitle streams as specified in the IFO do not correspond 
one-to-one to the streams in the mpeg-ps, but there is a mapping table which 
specifies the assignments.
In case of audio this hasn't been a big problem unless the dvd has been really 
screwed up, because there are the same number of logical streams as mpeg 
streams. So maybe you have a 0->1, 1->0 mapping in which case selecting one 
language in mplayer gets you the other soundtrack, but both tracks are 
accessible.
Subtitles are not so simple however, because for one logical stream you can 
have multiple mpeg subpicture streams. If you create a dvd for a 16:9 movie, 
you have to specify a spu stream for 4:3 letterboxed display and also for 
16:9 widescreen display. Up to this time I have run across only one dvd which 
did not map the same stream to both modes. So not a frequent case, but until 
now mplayer could not display the subtitles correctly for these dvds, because 
it considered logical stream N to map to mpeg stream N. But in this case the 
mapping is e.g. lang1->{0,1} lang2->{2,3}, so when selecting lang1 mplayer 
would play lang1 stream for letterbox, and when selecting lang2, it would 
play lang1 stream for widescreen. The lang2 sub would be totally 
inaccessible, even with -sid, because the code ignores values higher than the 
maximum number of subs.
So if you had problems like this, hopefully this will fix it. Patch is against 
the last CVS snapshot accessible from the webpage (20050806).

Regards,
Lehel
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