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ADTS AAC probe. 

fixes issue400

Originally committed as revision 15977 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2008-12-02 15:43:47 +00:00
parent a6f2c0d6e5
commit 2ba0cdd527
1 changed files with 33 additions and 1 deletions
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34
libavformat/raw.c
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@ -577,6 +577,38 @@ static int flac_probe(AVProbeData *p)
}
#endif
#ifdef CONFIG_AAC_DEMUXER
static int adts_aac_probe(AVProbeData *p)
{
int max_frames = 0, first_frames = 0;
int fsize, frames;
uint8_t *buf2;
uint8_t *buf = p->buf;
uint8_t *end = buf + p->buf_size - 7;
for(; buf < end; buf= buf2+1) {
buf2 = buf;
for(frames = 0; buf2 < end; frames++) {
uint32_t header = AV_RB16(buf2);
if((header&0xFFF6) != 0xFFF0)
break;
fsize = (AV_RB32(buf2+3)>>13) & 0x8FFF;
if(fsize < 7)
break;
buf2 += fsize;
}
max_frames = FFMAX(max_frames, frames);
if(buf == p->buf)
first_frames= frames;
}
if (first_frames>=3) return AVPROBE_SCORE_MAX/2+1;
else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
else if(max_frames>=3) return AVPROBE_SCORE_MAX/4;
else if(max_frames>=1) return 1;
else return 0;
}
#endif
/* Note: Do not forget to add new entries to the Makefile as well. */
@ -585,7 +617,7 @@ AVInputFormat aac_demuxer = {
"aac",
NULL_IF_CONFIG_SMALL("ADTS AAC"),
0,
NULL,
adts_aac_probe,
audio_read_header,
raw_read_partial_packet,
.flags= AVFMT_GENERIC_INDEX,