[MPlayer-dev-eng] [PATCH] Move SSA/ASS subtitles handling out of mkv demuxer

[Evgeniy Stepanov]

Hi,

this patch moves ass subtitle parsing out of mkv demuxer.

Headers are stored in sh_sub_t codecdata field and parsed lazily in 
update_subtitles. Events are passed as demuxer packets and handled also in 
update_subtitles. This way, subtitle handling in mkv demuxer is the same for 
all types of subtitles (except vobsub).

update_subtitles() becomes more complicated. There are 4 cases now:
1. 't' subs with libass -> convert to struct subtitle then add to ass_track
2. 'a' subs with libass -> add to ass_track directly
3. 't' subs without libass -> passed to sub_add_text
4. 'a' subs without libass -> 8 leading fields stripped, then passed to 
sub_add_text

With these changes, subtitles are always put into demuxer packets unchanged. 
Libass support in lavf demuxer will be also much easier to do.
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