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matroskadec: properly support BlockDuration

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This commit is contained in:
Luca Barbato 2012-09-17 02:48:02 +02:00
parent c831ebf616
commit 7d8431004a
1 changed files with 17 additions and 5 deletions
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22
libavformat/matroskadec.c
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@ -1992,7 +1992,7 @@ static int matroska_parse_frame(MatroskaDemuxContext *matroska,
static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
int size, int64_t pos, uint64_t cluster_time,
uint64_t duration, int is_keyframe,
uint64_t block_duration, int is_keyframe,
int64_t cluster_pos)
{
uint64_t timecode = AV_NOPTS_VALUE;
@ -2002,7 +2002,7 @@ static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
int16_t block_time;
uint32_t *lace_size = NULL;
int n, flags, laces = 0;
uint64_t num;
uint64_t num, duration;
if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
@ -2021,8 +2021,6 @@ static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
st = track->stream;
if (st->discard >= AVDISCARD_ALL)
return res;
if (duration == AV_NOPTS_VALUE)
duration = track->default_duration / matroska->time_scale;
block_time = AV_RB16(data);
data += 2;
@ -2039,7 +2037,6 @@ static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
is_keyframe = 0; /* overlapping subtitles are not key frame */
if (is_keyframe)
av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
}
if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
@ -2054,6 +2051,21 @@ static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
if (res)
goto end;
if (block_duration != AV_NOPTS_VALUE) {
duration = block_duration / laces;
if (block_duration != duration * laces) {
av_log(matroska->ctx, AV_LOG_WARNING,
"Incorrect block_duration, possibly corrupted container");
}
} else {
duration = track->default_duration / matroska->time_scale;
block_duration = duration * laces;
}
if (timecode != AV_NOPTS_VALUE)
track->end_timecode =
FFMAX(track->end_timecode, timecode + block_duration);
for (n = 0; n < laces; n++) {
if ((st->codec->codec_id == AV_CODEC_ID_RA_288 ||
st->codec->codec_id == AV_CODEC_ID_COOK ||