Function msmpeg4_decode_ext_header

libavcodec/msmpeg4.c:1548–1578

}

int msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size)
{
    int left= buf_size*8 - get_bits_count(&s->gb);
    int length= s->msmpeg4_version>=3 ? 17 : 16;
    /* the alt_bitstream reader could read over the end so we need to check it */
    if(left>=length && left<length+8)
    {
        int fps;

        fps= get_bits(&s->gb, 5);
        s->bit_rate= get_bits(&s->gb, 11)*1024;
        if(s->msmpeg4_version>=3)
            s->flipflop_rounding= get_bits1(&s->gb);
        else
            s->flipflop_rounding= 0;

//        printf("fps:%2d bps:%2d roundingType:%1d\n", fps, s->bit_rate/1024, s->flipflop_rounding);
    }
    else if(left<length+8)
    {
        s->flipflop_rounding= 0;
        if(s->msmpeg4_version != 2)
            av_log(s->avctx, AV_LOG_ERROR, "ext header missing, %d left\n", left);
    }
    else
    {
        av_log(s->avctx, AV_LOG_ERROR, "I frame too long, ignoring ext header\n");
    }

    return 0;
}

static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
{