int ff_h264_decode_picture_parameter_set(GetBitContext *gb, AVCodecContext *avctx,

                                         H264ParamSets *ps, int bit_length)

{

    AVBufferRef *pps_buf;

    const SPS *sps;

    unsigned int pps_id = get_ue_golomb(gb);

    PPS *pps;

    int qp_bd_offset;

    int bits_left;

    int ret;



    if (pps_id >= MAX_PPS_COUNT) {

        av_log(avctx, AV_LOG_ERROR, "pps_id %u out of range\n", pps_id);

        return AVERROR_INVALIDDATA;




    pps_buf = av_buffer_allocz(sizeof(*pps));

    if (!pps_buf)

        return AVERROR(ENOMEM);

    pps = (PPS*)pps_buf->data;



    pps->data_size = gb->buffer_end - gb->buffer;

    if (pps->data_size > sizeof(pps->data)) {

        av_log(avctx, AV_LOG_WARNING, "Truncating likely oversized PPS "

               "(%"SIZE_SPECIFIER" > %"SIZE_SPECIFIER")\n",

               pps->data_size, sizeof(pps->data));

        pps->data_size = sizeof(pps->data);


    memcpy(pps->data, gb->buffer, pps->data_size);



    pps->sps_id = get_ue_golomb_31(gb);

    if ((unsigned)pps->sps_id >= MAX_SPS_COUNT ||

        !ps->sps_list[pps->sps_id]) {

        av_log(avctx, AV_LOG_ERROR, "sps_id %u out of range\n", pps->sps_id);




    sps = (const SPS*)ps->sps_list[pps->sps_id]->data;

    if (sps->bit_depth_luma > 14) {

        av_log(avctx, AV_LOG_ERROR,

               "Invalid luma bit depth=%d\n",

               sps->bit_depth_luma);



    } else if (sps->bit_depth_luma == 11 || sps->bit_depth_luma == 13) {

        av_log(avctx, AV_LOG_ERROR,

               "Unimplemented luma bit depth=%d\n",

               sps->bit_depth_luma);

        ret = AVERROR_PATCHWELCOME;





    pps->cabac             = get_bits1(gb);

    pps->pic_order_present = get_bits1(gb);

    pps->slice_group_count = get_ue_golomb(gb) + 1;

    if (pps->slice_group_count > 1) {

        pps->mb_slice_group_map_type = get_ue_golomb(gb);

        av_log(avctx, AV_LOG_ERROR, "FMO not supported\n");

        switch (pps->mb_slice_group_map_type) {

        case 0:

#if 0

    |       for (i = 0; i <= num_slice_groups_minus1; i++)  |   |      |

    |           run_length[i]                               |1  |ue(v) |

#endif

            break;

        case 2:

#if 0

    |       for (i = 0; i < num_slice_groups_minus1; i++) { |   |      |

    |           top_left_mb[i]                              |1  |ue(v) |

    |           bottom_right_mb[i]                          |1  |ue(v) |

    |       }                                               |   |      |

#endif

            break;

        case 3:

        case 4:

        case 5:

#if 0

    |       slice_group_change_direction_flag               |1  |u(1)  |

    |       slice_group_change_rate_minus1                  |1  |ue(v) |

#endif

            break;

        case 6:

#if 0

    |       slice_group_id_cnt_minus1                       |1  |ue(v) |

    |       for (i = 0; i <= slice_group_id_cnt_minus1; i++)|   |      |

    |           slice_group_id[i]                           |1  |u(v)  |

#endif

            break;



    pps->ref_count[0] = get_ue_golomb(gb) + 1;

    pps->ref_count[1] = get_ue_golomb(gb) + 1;

    if (pps->ref_count[0] - 1 > 32 - 1 || pps->ref_count[1] - 1 > 32 - 1) {

        av_log(avctx, AV_LOG_ERROR, "reference overflow (pps)\n");






    qp_bd_offset = 6 * (sps->bit_depth_luma - 8);



    pps->weighted_pred                        = get_bits1(gb);

    pps->weighted_bipred_idc                  = get_bits(gb, 2);

    pps->init_qp                              = get_se_golomb(gb) + 26 + qp_bd_offset;

    pps->init_qs                              = get_se_golomb(gb) + 26 + qp_bd_offset;

    pps->chroma_qp_index_offset[0]            = get_se_golomb(gb);

    if (pps->chroma_qp_index_offset[0] < -12 || pps->chroma_qp_index_offset[0] > 12) {






    pps->deblocking_filter_parameters_present = get_bits1(gb);

    pps->constrained_intra_pred               = get_bits1(gb);

    pps->redundant_pic_cnt_present            = get_bits1(gb);



    pps->transform_8x8_mode = 0;

    memcpy(pps->scaling_matrix4, sps->scaling_matrix4,

           sizeof(pps->scaling_matrix4));

    memcpy(pps->scaling_matrix8, sps->scaling_matrix8,

           sizeof(pps->scaling_matrix8));



    bits_left = bit_length - get_bits_count(gb);

    if (bits_left > 0 && more_rbsp_data_in_pps(sps, avctx)) {

        pps->transform_8x8_mode = get_bits1(gb);

        decode_scaling_matrices(gb, sps, pps, 0,

                                pps->scaling_matrix4, pps->scaling_matrix8);

        // second_chroma_qp_index_offset

        pps->chroma_qp_index_offset[1] = get_se_golomb(gb);





    } else {

        pps->chroma_qp_index_offset[1] = pps->chroma_qp_index_offset[0];




    build_qp_table(pps, 0, pps->chroma_qp_index_offset[0],

                   sps->bit_depth_luma);

    build_qp_table(pps, 1, pps->chroma_qp_index_offset[1],

                   sps->bit_depth_luma);



    init_dequant_tables(pps, sps);



    if (pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])

        pps->chroma_qp_diff = 1;



    if (avctx->debug & FF_DEBUG_PICT_INFO) {

        av_log(avctx, AV_LOG_DEBUG,

               "pps:%u sps:%u %s slice_groups:%d ref:%u/%u %s qp:%d/%d/%d/%d %s %s %s %s\n",

               pps_id, pps->sps_id,

               pps->cabac ? "CABAC" : "CAVLC",

               pps->slice_group_count,

               pps->ref_count[0], pps->ref_count[1],

               pps->weighted_pred ? "weighted" : "",

               pps->init_qp, pps->init_qs, pps->chroma_qp_index_offset[0], pps->chroma_qp_index_offset[1],

               pps->deblocking_filter_parameters_present ? "LPAR" : "",

               pps->constrained_intra_pred ? "CONSTR" : "",

               pps->redundant_pic_cnt_present ? "REDU" : "",

               pps->transform_8x8_mode ? "8x8DCT" : "");




    remove_pps(ps, pps_id);

    ps->pps_list[pps_id] = pps_buf;



    return 0;



fail:

    av_buffer_unref(&pps_buf);

    return ret;
