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matroskadec: fix ASS subtitle track packets before emitting them

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Matroska does some butchering when storing the ASS lines. The start and end
time are removed (because they are duplicated in the container).
The matroska_fix_ass_packet() function simply restore those start and end
time in ASS lines to ensure our ASS packets comply with the ASS spec.

Originally committed as revision 15211 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2008-09-04 23:26:12 +00:00
parent f2abc55945
commit 3eb9bfbb84
1 changed files with 35 additions and 0 deletions
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35
libavformat/matroskadec.c
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@ -28,6 +28,7 @@
* Specs available on the Matroska project page: http://www.matroska.org/.
*/
#include <stdio.h>
#include "avformat.h"
/* For codec_get_id(). */
#include "riff.h"
@ -932,6 +933,37 @@ static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
return -1;
}
static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
AVPacket *pkt)
{
char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
for (; *ptr!=',' && ptr<end-1; ptr++);
if (*ptr == ',')
layer = ++ptr;
for (; *ptr!=',' && ptr<end-1; ptr++);
if (*ptr == ',') {
int64_t end_pts = pkt->pts + pkt->convergence_duration;
int sc = matroska->time_scale * pkt->pts / 10000000;
int ec = matroska->time_scale * end_pts / 10000000;
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 + FF_INPUT_BUFFER_PADDING_SIZE;
if (!(line = av_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);
av_free(pkt->data);
pkt->data = line;
pkt->size = strlen(line);
}
}
static void matroska_convert_tags(AVFormatContext *s, EbmlList *list)
{
MatroskaTag *tags = list->elem;
@ -1588,6 +1620,9 @@ static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
else
pkt->duration = duration;
if (st->codec->codec_id == CODEC_ID_SSA)
matroska_fix_ass_packet(matroska, pkt);
dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
}