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ac3_probe: fix probing of non standard AC3 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-08-26 01:55:10 +02:00
parent 4b9e44868b
commit 0c3a3b75d7
1 changed files with 22 additions and 4 deletions
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26
libavformat/ac3dec.c
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@ -37,18 +37,36 @@ static int ac3_eac3_probe(AVProbeData *p, enum AVCodecID expected_codec_id)
end = buf + p->buf_size;
for(; buf < end; buf++) {
if(buf > p->buf && (buf[0] != 0x0B || buf[1] != 0x77) )
if(buf > p->buf && !(buf[0] == 0x0B && buf[1] == 0x77)
&& !(buf[0] == 0x77 && buf[1] == 0x0B) )
continue;
buf2 = buf;
for(frames = 0; buf2 < end; frames++) {
uint8_t buf3[4096];
int i;
if(!memcmp(buf2, "\x1\x10\0\0\0\0\0\0", 8))
buf2+=16;
init_get_bits(&gbc, buf2, 54);
if (buf[0] == 0x77 && buf[1] == 0x0B) {
for(i=0; i<8; i+=2) {
buf3[i ] = buf[i+1];
buf3[i+1] = buf[i ];
}
init_get_bits(&gbc, buf3, 54);
}else
init_get_bits(&gbc, buf2, 54);
if(avpriv_ac3_parse_header(&gbc, &hdr) < 0)
break;
if(buf2 + hdr.frame_size > end ||
av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, buf2 + 2, hdr.frame_size - 2))
if(buf2 + hdr.frame_size > end)
break;
if (buf[0] == 0x77 && buf[1] == 0x0B) {
av_assert0(hdr.frame_size <= sizeof(buf3));
for(; i<hdr.frame_size; i+=2) {
buf3[i ] = buf[i+1];
buf3[i+1] = buf[i ];
}
}
if(av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, gbc.buffer + 2, hdr.frame_size - 2))
break;
if (hdr.bitstream_id > 10)
codec_id = AV_CODEC_ID_EAC3;