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Make MPC demuxer deal with ID3 tags at the beginning 

Originally committed as revision 7392 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2007-01-01 05:29:53 +00:00
parent c57d34693b
commit 0587b0cacd
1 changed files with 21 additions and 3 deletions
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24
libavformat/mpc.c
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@ -45,6 +45,8 @@ static int mpc_probe(AVProbeData *p)
return 0;
if (d[0] == 'M' && d[1] == 'P' && d[2] == '+' && (d[3] == 0x17 || d[3] == 0x7))
return AVPROBE_SCORE_MAX;
if (d[0] == 'I' && d[1] == 'D' && d[2] == '3')
return AVPROBE_SCORE_MAX / 2;
return 0;
}
@ -52,10 +54,26 @@ static int mpc_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
MPCContext *c = s->priv_data;
AVStream *st;
int t;
if(get_le24(&s->pb) != MKTAG('M', 'P', '+', 0)){
av_log(s, AV_LOG_ERROR, "Not a Musepack file\n");
return -1;
t = get_le24(&s->pb);
if(t != MKTAG('M', 'P', '+', 0)){
if(t != MKTAG('I', 'D', '3', 0)){
av_log(s, AV_LOG_ERROR, "Not a Musepack file\n");
return -1;
}
/* skip ID3 tags and try again */
url_fskip(&s->pb, 3);
t = get_byte(&s->pb) << 21;
t |= get_byte(&s->pb) << 14;
t |= get_byte(&s->pb) << 7;
t |= get_byte(&s->pb);
av_log(s, AV_LOG_DEBUG, "Skipping %d(%X) bytes of ID3 data\n", t, t);
url_fskip(&s->pb, t);
if(get_le24(&s->pb) != MKTAG('M', 'P', '+', 0)){
av_log(s, AV_LOG_ERROR, "Not a Musepack file\n");
return -1;
}
}
c->ver = get_byte(&s->pb);
if(c->ver != 0x07 && c->ver != 0x17){