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probe for mpeg audio

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Originally committed as revision 5457 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2006-06-05 22:41:14 +00:00
parent 065ee1ec32
commit dc4ed3b141
1 changed files with 27 additions and 1 deletions
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28
libavformat/mp3.c
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@ -240,6 +240,32 @@ static void id3_create_tag(AVFormatContext *s, uint8_t *buf)
}
/* mp3 read */
static int mp3_read_probe(AVProbeData *p)
{
int d;
if(p->buf_size < 4)
return 0;
if(p->buf[0] == 'I' && p->buf[1] == 'D' && p->buf[2] == '3' &&
p->buf[3] < 5)
return AVPROBE_SCORE_MAX;
if(p->buf[0] != 0xff)
return 0;
d = p->buf[1];
if((d & 0xe0) != 0xe0 || ((d & 0x18) == 0x08 || (d & 0x06) == 0))
return 0;
d = p->buf[2];
if((d & 0xf0) == 0xf0 || (d & 0x0c) == 0x0c)
return 0;
return AVPROBE_SCORE_MAX;
}
static int mp3_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
@ -346,7 +372,7 @@ AVInputFormat mp3_iformat = {
"mp3",
"MPEG audio",
0,
NULL,
mp3_read_probe,
mp3_read_header,
mp3_read_packet,
mp3_read_close,