Function mpeg_decode_sequence_extension

libavcodec/mpeg12.c:1392–1426

}

static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
{
    MpegEncContext *s= &s1->mpeg_enc_ctx;
    int horiz_size_ext, vert_size_ext;
    int bit_rate_ext;

    skip_bits(&s->gb, 1); /* profile and level esc*/
    s->avctx->profile= get_bits(&s->gb, 3);
    s->avctx->level= get_bits(&s->gb, 4);
    s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
    s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
    horiz_size_ext = get_bits(&s->gb, 2);
    vert_size_ext = get_bits(&s->gb, 2);
    s->width |= (horiz_size_ext << 12);
    s->height |= (vert_size_ext << 12);
    bit_rate_ext = get_bits(&s->gb, 12);  /* XXX: handle it */
    s->bit_rate += (bit_rate_ext << 18) * 400;
    skip_bits1(&s->gb); /* marker */
    s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;

    s->low_delay = get_bits1(&s->gb);
    if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;

    s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
    s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;

    dprintf(s->avctx, "sequence extension\n");
    s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
    s->avctx->sub_id = 2; /* indicates MPEG-2 found */

    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
        av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
               s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);

}

static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
{