Function ff_h264_decode_seq_parameter_set

libavcodec/h264_ps.c:284–592

}

int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
                                     H264ParamSets *ps, int ignore_truncation)
{
    int profile_idc, level_idc, constraint_set_flags = 0;
    unsigned int sps_id;
    int i, log2_max_frame_num_minus4;
    SPS *sps;
    int ret;

    sps = av_refstruct_allocz(sizeof(*sps));
    if (!sps)
        return AVERROR(ENOMEM);

    sps->data_size = get_bits_bytesize(gb, 1);
    if (sps->data_size > sizeof(sps->data)) {
        av_log(avctx, AV_LOG_DEBUG, "Truncating likely oversized SPS\n");
        sps->data_size = sizeof(sps->data);
    }
    memcpy(sps->data, gb->buffer, sps->data_size);

    // Re-add the removed stop bit (may be used by hwaccels).
    if (!(gb->size_in_bits & 7) && sps->data_size < sizeof(sps->data))
        sps->data[sps->data_size++] = 0x80;

    profile_idc           = get_bits(gb, 8);
    constraint_set_flags |= get_bits1(gb) << 0;   // constraint_set0_flag
    constraint_set_flags |= get_bits1(gb) << 1;   // constraint_set1_flag
    constraint_set_flags |= get_bits1(gb) << 2;   // constraint_set2_flag
    constraint_set_flags |= get_bits1(gb) << 3;   // constraint_set3_flag
    constraint_set_flags |= get_bits1(gb) << 4;   // constraint_set4_flag
    constraint_set_flags |= get_bits1(gb) << 5;   // constraint_set5_flag
    skip_bits(gb, 2);                             // reserved_zero_2bits
    level_idc = get_bits(gb, 8);
    sps_id    = get_ue_golomb_31(gb);

    if (sps_id >= MAX_SPS_COUNT) {
        av_log(avctx, AV_LOG_ERROR, "sps_id %u out of range\n", sps_id);
        goto fail;
    }

    sps->sps_id               = sps_id;
    sps->time_offset_length   = 24;
    sps->profile_idc          = profile_idc;
    sps->constraint_set_flags = constraint_set_flags;
    sps->level_idc            = level_idc;
    sps->vui.video_full_range_flag = -1;

    memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));
    memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));
    sps->scaling_matrix_present = 0;
    sps->vui.matrix_coeffs = AVCOL_SPC_UNSPECIFIED;

    if (sps->profile_idc == 100 ||  // High profile
        sps->profile_idc == 110 ||  // High10 profile
        sps->profile_idc == 122 ||  // High422 profile
        sps->profile_idc == 244 ||  // High444 Predictive profile
        sps->profile_idc ==  44 ||  // Cavlc444 profile
        sps->profile_idc ==  83 ||  // Scalable Constrained High profile (SVC)