Revert bad changes to SSA/ASS subtitle packet format

The following commits are reverted partially or completely:
"a valid ASS line contains 9 ',' before actual text"
"demux_mkv: output correctly formated ASS packets"
"libass: add a new ass_process_data() to process demuxed subtitle packets"

These commits converted the internal representation of SSA/ASS
subtitle packets from the format used by Matroska to a custom format
where each packet has contents exactly matching one line in complete
SSA script files. AFAIK no files natively use such a format for muxed
subtitles. The stated reason for this change was to use a format that
could in principle be muxed into a maximal number of containers. SSA
subtitles do not have an implicit duration so both start time and
duration or end time need to be specified explicitly; the new format
moved timing information inside the codec packet data so it could be
muxed without modification into containers that can represent only
start time at the container level. However such a change is wrong from
the viewpoint of program architecture. Timing information belongs to
the demuxer level, but these commits moved not only the duration but
also the authoritative value of the start time to inside the codec
data. Additionally the new format lost the value of the Matroska
ReadOrder field which is used by MPlayer.

This commit changes the internal packet format back to that used by
Matroska and makes the internal Matroska demuxer output that format
again. Libavformat still outputs the "new" format; it could be
converted back to the Matroska format in demux_lavf.c, but I'm not
adding that code at least yet. The current lavf code has similar
problems as the reverted code in MPlayer, and it also currently fails
to provide any way to access the value of the ReadOrder field. I hope
that the lavf side will be improved; if it isn't conversion can be
added later. For now I'll make MPlayer default to the internal Matroska
demuxer instead of the lavf one in a separate commit.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@27550 b3059339-0415-0410-9bf9-f77b7e298cf2

libmpdemux/demux_mkv.c

@@ -2566,42 +2566,10 @@ demux_mkv_read_block_lacing (uint8_t *buffer, uint64_t *size,
   return 0;
 }
 
-static void fix_ass_packet(char **block, int64_t *size,
-                           uint64_t block_duration, uint64_t timecode)
-{
-    char *line, *layer, *ptr = *block, *end = ptr+*size;
-    *end = 0;
-    for (; *ptr!=',' && ptr<end-1; ptr++);
-    if (*ptr == ',')
-        layer = ++ptr;
-    for (; *ptr!=',' && ptr<end-1; ptr++);
-    if (*ptr == ',') {
-        int64_t end_pts = timecode + block_duration;
-        int sc = timecode / 10;
-        int ec = end_pts  / 10;
-        int sh, sm, ss, eh, em, es, len;
-        sh = sc/360000;  sc -= 360000*sh;
-        sm = sc/  6000;  sc -=   6000*sm;
-        ss = sc/   100;  sc -=    100*ss;
-        eh = ec/360000;  ec -= 360000*eh;
-        em = ec/  6000;  ec -=   6000*em;
-        es = ec/   100;  ec -=    100*es;
-        *ptr++ = '\0';
-        len = 50 + end-ptr;
-        if (!(line = malloc(len)))
-            return;
-        snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s",
-                 layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
-        *block = line;
-        *size = strlen(line);
-    }
-}
-
 static void
 handle_subtitles(demuxer_t *demuxer, mkv_track_t *track, char *block,
                  int64_t size, uint64_t block_duration, uint64_t timecode)
 {
-  char *data = block;
   demux_packet_t *dp;
 
   if (block_duration == 0)
@@ -2611,17 +2579,12 @@ handle_subtitles(demuxer_t *demuxer, mkv_track_t *track, char *block,
       return;
     }
 
-  if (track->subtitle_type == MATROSKA_SUBTYPE_SSA)
-      fix_ass_packet(&data, &size, block_duration, timecode);
-
   sub_utf8 = 1;
   dp = new_demux_packet(size);
-  memcpy(dp->buffer, data, size);
+  memcpy(dp->buffer, block, size);
   dp->pts = timecode / 1000.0f;
   dp->endpts = (timecode + block_duration) / 1000.0f;
   ds_add_packet(demuxer->sub, dp);
-  if (data != block)
-      free(data);
 }
 
 // Taken from demux_real.c. Thanks to the original developpers :)

mpcommon.c

@@ -122,7 +122,9 @@ void update_subtitles(sh_video_t *sh_video, demux_stream_t *d_dvdsub, int reset)
                 ass_track = sh ? sh->ass_track : NULL;
                 if (!ass_track) continue;
                 if (type == 'a') { // ssa/ass subs with libass
-                    ass_process_data(ass_track, packet, len);
+                    ass_process_chunk(ass_track, packet, len,
+                                      (long long)(pts*1000 + 0.5),
+                                      (long long)((endpts-pts)*1000 + 0.5));
                 } else { // plaintext subs with libass
                     vo_sub = NULL;
                     if (pts != MP_NOPTS_VALUE) {
@@ -143,7 +145,7 @@ void update_subtitles(sh_video_t *sh_video, demux_stream_t *d_dvdsub, int reset)
                 if (type == 'a') { // ssa/ass subs without libass => convert to plaintext
                     int i;
                     unsigned char* p = packet;
-                    for (i=0; i < 9 && *p != '\0'; p++)
+                    for (i=0; i < 8 && *p != '\0'; p++)
                         if (*p == ',')
                             i++;
                     if (*p == '\0')  /* Broken line? */