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Improve MPEG-PS-in-MOV detection.

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Fixes issue 1520.
This commit is contained in:
Carl Eugen Hoyos 2012-10-21 19:30:43 +02:00
parent 747a00b688
commit fa190b3cd7
1 changed files with 8 additions and 9 deletions
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17
libavformat/mov.c
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@ -2908,15 +2908,14 @@ static int mov_probe(AVProbeData *p)
* MOV-packed MPEG-PS */
offset = moov_offset;
while(offset < (p->buf_size - 20)){ /* Sufficient space */
/* We found an actual stsd atom */
if(AV_RL32(p->buf+offset) == MKTAG('s','t','s','d') &&
/* Make sure there's only one stream */
AV_RB32(p->buf + offset + 8) == 1 &&
AV_RL32(p->buf + offset + 16) == MKTAG('m','1','s',' ')
){
av_log(NULL, AV_LOG_WARNING, "Found m1s tag indicating this is a MOV-packed MPEG-PS.\n");
/* We found an stsd atom describing an MPEG-PS-in-MOV, return a
while(offset < (p->buf_size - 16)){ /* Sufficient space */
/* We found an actual hdlr atom */
if(AV_RL32(p->buf + offset ) == MKTAG('h','d','l','r') &&
AV_RL32(p->buf + offset + 8) == MKTAG('m','h','l','r') &&
AV_RL32(p->buf + offset + 12) == MKTAG('M','P','E','G')){
av_log(NULL, AV_LOG_WARNING, "Found media data tag MPEG indicating this is a MOV-packed MPEG-PS.\n");
/* We found a media handler reference atom describing an
* MPEG-PS-in-MOV, return a
* low score to force expanding the probe window until
* mpegps_probe finds what it needs */
return 5;