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Extract aspect ratio from ODML/vprp.

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Originally committed as revision 11365 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2008-01-01 22:05:51 +00:00
parent 2576a9ecec
commit c86ec2f4c3
1 changed files with 25 additions and 0 deletions
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25
libavformat/avidec.c
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@ -523,6 +523,31 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
}
url_fseek(pb, i+size, SEEK_SET);
break;
case MKTAG('v', 'p', 'r', 'p'):
if(stream_index < (unsigned)s->nb_streams && size > 9*4){
AVRational active, active_aspect;
st = s->streams[stream_index];
get_le32(pb);
get_le32(pb);
get_le32(pb);
get_le32(pb);
get_le32(pb);
active_aspect.num= get_le16(pb);
active_aspect.den= get_le16(pb);
active.num = get_le32(pb);
active.den = get_le32(pb);
get_le32(pb); //nbFieldsPerFrame
if(active_aspect.num && active_aspect.den && active.num && active.den){
st->codec->sample_aspect_ratio= av_div_q(active_aspect, active);
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
}
size -= 9*4;
}
url_fseek(pb, size, SEEK_CUR);
break;
case MKTAG('I', 'N', 'A', 'M'):
avi_read_tag(pb, s->title, sizeof(s->title), size);
break;