Function do_probe

libhb/stream.c:4198–4366

}

static int do_probe(hb_stream_t *stream, hb_pes_stream_t *pes, hb_buffer_t *buf)
{
    int result = 0;

    // Check upper limit of per stream data to probe
    if ( pes->probe_buf == NULL )
    {
        pes->probe_buf = hb_buffer_init( 0 );
        pes->probe_next_size = 0;
        pes->probe_count = 0;
    }

    if ( pes->probe_buf->size > HB_MAX_PROBE_SIZE )
    {
        // Max size reached before finding anything.  Try again from
        // another start PES
        pes->probe_count++;
        hb_buffer_close( &pes->probe_buf );
        if (pes->probe_count >= HB_MAX_PROBES)
        {
            return -1;
        }
        pes->probe_buf = hb_buffer_init( 0 );
        pes->probe_next_size = 0;
    }

    // Add this stream buffer to probe buffer and perform probe
    int size = pes->probe_buf->size + buf->size;

    hb_buffer_realloc(pes->probe_buf, size + AVPROBE_PADDING_SIZE );
    memcpy( pes->probe_buf->data + pes->probe_buf->size, buf->data, buf->size );
    pes->probe_buf->size = size;

    if ( pes->codec == HB_ACODEC_DCA_HD )
    {
        // We need to probe for the profile of DTS audio in this stream.
        return probe_dts_profile( stream, pes );
    }

    // Probing is slow, so we don't want to re-probe the probe
    // buffer for every packet we add to it.  Grow the buffer
    // by a factor of 2 before probing again.
    if ( pes->probe_buf->size < pes->probe_next_size )
        return 0;
    pes->probe_next_size = pes->probe_buf->size * 2;

    if (pes->codec_param != AV_CODEC_ID_NONE)
    {
        // Already did a format probe, but some stream types require a
        // deeper parser probe. E.g. MPEG-1/2, av_probe_input_format2
        // resolves to AV_CODEC_ID_MPEG2VIDEO for both MPEG-1 and MPEG-2
        result = do_deep_probe(stream, pes);
        if (result)
        {
            hb_buffer_close(&pes->probe_buf);
        }
        return result;
    }