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fix misdetection of mp3could_not_find_codec_parameters.mp3

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Originally committed as revision 10908 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-11-03 13:48:30 +00:00
parent d447fc3132
commit c6dcd0d7f0
1 changed files with 24 additions and 2 deletions
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26
libavformat/mpeg.c
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@ -44,6 +44,26 @@ static int cdxa_probe(AVProbeData *p)
return 0;
}
static int check_pes(uint8_t *p, uint8_t *end){
int pes1;
int pes2= (p[3] & 0xC0) == 0x80
&& (p[4] & 0xC0) != 0x40
&&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0));
for(p+=3; p<end && *p == 0xFF; p++);
if((*p&0xC0) == 0x40) p+=2;
if((*p&0xF0) == 0x20){
pes1= p[0]&p[2]&p[4]&1;
p+=5;
}else if((*p&0xF0) == 0x30){
pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;
p+=10;
}else
pes1 = *p == 0x0F;
return pes1||pes2;
}
static int mpegps_probe(AVProbeData *p)
{
uint32_t code= -1;
@ -58,11 +78,13 @@ static int mpegps_probe(AVProbeData *p)
for(i=0; i<p->buf_size; i++){
code = (code<<8) + p->buf[i];
if ((code & 0xffffff00) == 0x100) {
int pes= check_pes(p->buf+i, p->buf+i+p->buf_size);
if(code == SYSTEM_HEADER_START_CODE) sys++;
else if(code == PRIVATE_STREAM_1) priv1++;
else if(code == PACK_START_CODE) pspack++;
else if((code & 0xf0) == VIDEO_ID) vid++;
else if((code & 0xe0) == AUDIO_ID) audio++;
else if((code & 0xf0) == VIDEO_ID && pes) vid++;
else if((code & 0xe0) == AUDIO_ID && pes) audio++;
}
}