[Ffmpeg-devel] [PATCH] DVR-MS probe audio format - was DVR-MS bug (MP2 decoding)

[John Donaghy]

> theres a ac3_probe in libaformar/raw.c, if it works with what is stored in
asf
> that i dunno
>

I got a prototype of the proposed approach to work but I had to modify the
ac3_probe function to read up to the first 'sync word'. Is that going to be
acceptable?

new version...

int ac3_probe(AVProbeData *p)
{
    int score=0;
    int i;

    // find first sync word
    for (i=0; i<p->buf_size-6; i++) {
        if((p->buf[i] == 0x0B) && (p->buf[i+1] == 0x77)) {
            break;
        }
    }

    if(p->buf_size-i < 6)
        return 0;

    if((p->buf[i] == 0x0B) && (p->buf[i+1] == 0x77) &&    // sync word
       ((p->buf[i+4] >> 6) != 3) &&                       // fscod
       ((p->buf[i+5] >> 3) <= 16)) {                      // bsid
        score = AVPROBE_SCORE_MAX / 2 + 10;
    }

    return score;
}