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simplify ac3_probe() and eac3_probe(). patch by Aurelien Jacobs. 

Originally committed as revision 15145 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2008-09-01 15:31:14 +00:00 committed by Justin Ruggles
parent 4d951ef86d
commit 75198e7a6d
1 changed files with 6 additions and 13 deletions
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19
libavformat/raw.c
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@ -488,18 +488,18 @@ static int dirac_probe(AVProbeData *p)
#endif
#if (ENABLE_AC3_DEMUXER || ENABLE_EAC3_DEMUXER)
static int ac3_eac3_probe(AVProbeData *p, int *codec_id)
static int ac3_eac3_probe(AVProbeData *p, enum CodecID expected_codec_id)
{
int max_frames, first_frames = 0, frames;
uint8_t *buf, *buf2, *end;
AC3HeaderInfo hdr;
GetBitContext gbc;
enum CodecID codec_id = CODEC_ID_AC3;
max_frames = 0;
buf = p->buf;
end = buf + p->buf_size;
*codec_id = CODEC_ID_AC3;
for(; buf < end; buf++) {
buf2 = buf;
@ -511,13 +511,14 @@ static int ac3_eac3_probe(AVProbeData *p, int *codec_id)
av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, buf2 + 2, hdr.frame_size - 2))
break;
if (hdr.bitstream_id > 10)
*codec_id = CODEC_ID_EAC3;
codec_id = CODEC_ID_EAC3;
buf2 += hdr.frame_size;
}
max_frames = FFMAX(max_frames, frames);
if(buf == p->buf)
first_frames = frames;
}
if(codec_id != expected_codec_id) return 0;
if (first_frames>=3) return AVPROBE_SCORE_MAX * 3 / 4;
else if(max_frames>=3) return AVPROBE_SCORE_MAX / 2;
else if(max_frames>=1) return 1;
@ -528,22 +529,14 @@ static int ac3_eac3_probe(AVProbeData *p, int *codec_id)
#ifdef CONFIG_AC3_DEMUXER
static int ac3_probe(AVProbeData *p)
{
int codec_id = CODEC_ID_NONE;
int score = ac3_eac3_probe(p, &codec_id);
if(codec_id == CODEC_ID_AC3)
return score;
return 0;
return ac3_eac3_probe(p, CODEC_ID_AC3);
}
#endif
#ifdef CONFIG_EAC3_DEMUXER
static int eac3_probe(AVProbeData *p)
{
int codec_id = CODEC_ID_NONE;
int score = ac3_eac3_probe(p, &codec_id);
if(codec_id == CODEC_ID_EAC3)
return score;
return 0;
return ac3_eac3_probe(p, CODEC_ID_EAC3);
}
#endif