Function evcc_parse_sps

libavformat/evc.c:80–125

@see ISO_IEC_23094-1 (7.3.2.1 SPS RBSP syntax)

// @see ISO_IEC_23094-1 (7.3.2.1 SPS RBSP syntax)
static int evcc_parse_sps(const uint8_t *bs, int bs_size, EVCDecoderConfigurationRecord *evcc)
{
    GetBitContext gb;
    unsigned sps_seq_parameter_set_id;
    int ret;

    bs += EVC_NALU_HEADER_SIZE;
    bs_size -= EVC_NALU_HEADER_SIZE;

    ret = init_get_bits8(&gb, bs, bs_size);
    if (ret < 0)
        return ret;

    sps_seq_parameter_set_id = get_ue_golomb_long(&gb);

    if (sps_seq_parameter_set_id >= EVC_MAX_SPS_COUNT)
        return AVERROR_INVALIDDATA;

    // the Baseline profile is indicated by profile_idc eqal to 0
    // the Main profile is indicated by profile_idc eqal to 1
    evcc->profile_idc = get_bits(&gb, 8);

    evcc->level_idc = get_bits(&gb, 8);

    evcc->toolset_idc_h = get_bits_long(&gb, 32);
    evcc->toolset_idc_l = get_bits_long(&gb, 32);

    // 0 - monochrome
    // 1 - 4:2:0
    // 2 - 4:2:2
    // 3 - 4:4:4
    evcc->chroma_format_idc = get_ue_golomb_long(&gb);
    if (evcc->chroma_format_idc > 3)
        return AVERROR_INVALIDDATA;

    evcc->pic_width_in_luma_samples = get_ue_golomb_long(&gb);
    evcc->pic_height_in_luma_samples = get_ue_golomb_long(&gb);

    evcc->bit_depth_luma_minus8 = get_ue_golomb_long(&gb);
    evcc->bit_depth_chroma_minus8 = get_ue_golomb_long(&gb);
    // EVCDecoderConfigurationRecord can't store values > 7. Limit it to bit depth 14.
    if (evcc->bit_depth_luma_minus8 > 6 || evcc->bit_depth_chroma_minus8 > 6)
        return AVERROR_INVALIDDATA;

    return 0;
}

// @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3
static int evcc_array_add_nal_unit(const uint8_t *nal_buf, uint32_t nal_size,