subs: always use sub decoder framework for libass rendering

Remove subtitle selection code setting osd->ass_track directly and
vf_ass/vf_vo code rendering the track directly with libass. Instead,
do track selection and rendering with dec_sub.c functions.

Before, mpctx->set_of_ass_tracks[] contained bare libass tracks
generated from external subtitle files. For use with dec_sub.c, it now
contains struct sh_sub instances with decoder already initialized.

This commit breaks the sub_step command ('g' and 'y' keys) for
libass-rendered subtitles. It could be fixed, but it's so useless -
especially as with the existing implementation there's no practical
way to get subtitle delay back to normal after using it - that I
didn't bother.

Conflicts:
	command.c
	mp_core.h
	mplayer.c

1 files changed, 1 insertions, 0 deletions

diff --git a/options.h b/options.h
index 307f9682b3..2b06535afd 100644
--- a/options.h
+++ b/options.h
@@ -74,6 +74,7 @@ typedef struct MPOpts {
     int sub_id;
     char **audio_lang;
     char **sub_lang;
+    int sub_visibility;
     int hr_mp3_seek;
     char *quvi_format;