Function ff_av1_parse_seq_header

libavformat/av1.c:336–397

}

int ff_av1_parse_seq_header(AV1SequenceParameters *seq, const uint8_t *buf, int size)
{
    int is_av1c;

    if (size <= 0)
        return AVERROR_INVALIDDATA;

    is_av1c = !!(buf[0] & 0x80);
    if (is_av1c) {
        GetBitContext gb;
        int ret, version = buf[0] & 0x7F;

        if (version != 1 || size < 4)
            return AVERROR_INVALIDDATA;

        ret = init_get_bits8(&gb, buf, 4);
        if (ret < 0)
            return ret;

        memset(seq, 0, sizeof(*seq));

        skip_bits(&gb, 8);
        seq->profile    = get_bits(&gb, 3);
        seq->level      = get_bits(&gb, 5);
        seq->tier       = get_bits(&gb, 1);
        seq->bitdepth   = get_bits(&gb, 1) * 2 + 8;
        seq->bitdepth  += get_bits(&gb, 1) * 2;
        seq->monochrome               = get_bits(&gb, 1);
        seq->chroma_subsampling_x     = get_bits(&gb, 1);
        seq->chroma_subsampling_y     = get_bits(&gb, 1);
        seq->chroma_sample_position   = get_bits(&gb, 2);
        seq->color_primaries          = AVCOL_PRI_UNSPECIFIED;
        seq->transfer_characteristics = AVCOL_TRC_UNSPECIFIED;
        seq->matrix_coefficients      = AVCOL_SPC_UNSPECIFIED;

        size -= 4;
        buf  += 4;
    }

    while (size > 0) {
        int64_t obu_size;
        int start_pos, type, temporal_id, spatial_id;
        int len = parse_obu_header(buf, size, &obu_size, &start_pos,
                                   &type, &temporal_id, &spatial_id);
        if (len < 0)
            return len;

        switch (type) {
        case AV1_OBU_SEQUENCE_HEADER:
            if (!obu_size)
                return AVERROR_INVALIDDATA;

            return parse_sequence_header(seq, buf + start_pos, obu_size);
        default:
            break;
        }
        size -= len;
        buf  += len;