h. 264 SPS PPS 분석 소스 코드, C 구현

......
sps->profile_idc          = get_bits(buf, 8);
    sps->constraint_set0_flag = get_1bit(buf);  
    sps->constraint_set1_flag = get_1bit(buf);  
    sps->constraint_set2_flag = get_1bit(buf);  
    sps->constraint_set3_flag = get_1bit(buf); 
    sps->reserved_zero_4bits  = get_bits(buf, 4);
    sps->level_idc            = get_bits(buf, 8);
    sps->seq_parameter_set_id = parse_ue(buf);
 
    profile_idc = sps->profile_idc;
    if( (profile_idc == 100) || (profile_idc == 110) || (profile_idc == 122) || (profile_idc == 244)
    || (profile_idc  == 44) || (profile_idc == 83) || (profile_idc  == 86) || (profile_idc == 118) ||\
    (profile_idc == 128))
    {
        sps->chroma_format_idc = parse_ue(buf);
        if(sps->chroma_format_idc == 3)
        {
            sps->separate_colour_plane_flag = get_1bit(buf);
        }

        sps->bit_depth_luma_minus8 = parse_ue(buf);
        sps->bit_depth_chroma_minus8 = parse_ue(buf);
        sps->qpprime_y_zero_transform_bypass_flag = get_1bit(buf);
        
        sps->seq_scaling_matrix_present_flag = get_1bit(buf);
        if(sps->seq_scaling_matrix_present_flag)
        {
            for(i=0; i<((sps->chroma_format_idc != 3)?8:12); i++)
            {
                sps->seq_scaling_list_present_flag[i] = get_1bit(buf);
                if(sps->seq_scaling_list_present_flag[i])
                {
                    if(i<6)
                    {
                        for(j=0; j<16; j++)
                        {
                            last_scale = 8;
                            next_scale = 8;
                            if(next_scale != 0)
                            {
                                delta_scale = parse_se(buf);
                                next_scale = (last_scale + delta_scale + 256)%256;
                                sps->UseDefaultScalingMatrix4x4Flag[i] = ((j == 0) && (next_scale == 0));
                            }
                            sps->ScalingList4x4[i][j] = (next_scale == 0)?last_scale:next_scale;
                            last_scale = sps->ScalingList4x4[i][j];
                        }
                    }
                    else
                    {
......