core: add demux_sub pseudo demuxer

Subtitle files are opened in mplayer.c, not using the demuxer
infrastructure in general. Pretend that this is not the case (outside of
the loading code) by opening a pseudo demuxer that does nothing. One
advantage is that the initialization code is now the same, and there's
no confusion about what the difference between track->stream,
track->sh_sub and mpctx->sh_sub is supposed to be.

This is a bit stupid, and it would be much better if there were proper
subtitle demuxers (there are many in recent FFmpeg, but not Libav). So
for now this is just a transition to a more proper architecture. Look
at demux_sub like an artifical limb: it's ugly, but don't hate it - it
helps you to get on with your life.

1 files changed, 1 insertions, 0 deletions

diff --git a/demux/stheader.h b/demux/stheader.h
index 433dc7ef71..09e9d8682b 100644
--- a/demux/stheader.h
+++ b/demux/stheader.h
@@ -164,6 +164,7 @@ typedef struct sh_sub {
     bool active; // after track switch decoder may stay initialized, not active
     unsigned char *extradata;   // extra header data passed from demuxer
     int extradata_len;
+    struct ass_track *track; // loaded by libass
     const struct sd_functions *sd_driver;
 } sh_sub_t;