static inline int decode_picture_parameter_set(H264Context *h, int bit_length){
    MpegEncContext * const s = &h->s;
    unsigned int tmp, pps_id= get_ue_golomb(&s->gb);
    PPS *pps;

    if(pps_id >= MAX_PPS_COUNT) {
        av_log(h->s.avctx, AV_LOG_ERROR, "pps_id (%d) out of range\n", pps_id);
        return -1;
    }

    tmp= get_ue_golomb(&s->gb);
    if(tmp>=MAX_SPS_COUNT || h->sps_buffers[tmp] == NULL){
        av_log(h->s.avctx, AV_LOG_ERROR, "sps_id out of range\n");
        return -1;
    }
    pps= av_mallocz(sizeof(PPS));
    if(pps == NULL)
        return -1;
    pps->sps_id= tmp;

    pps->cabac= get_bits1(&s->gb);
    pps->pic_order_present= get_bits1(&s->gb);
    pps->slice_group_count= get_ue_golomb(&s->gb) + 1;
    if(pps->slice_group_count > 1 ){
        pps->mb_slice_group_map_type= get_ue_golomb(&s->gb);
        av_log(h->s.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(&s->gb) + 1;
    pps->ref_count[1]= get_ue_golomb(&s->gb) + 1;
    if(pps->ref_count[0]-1 > 32-1 || pps->ref_count[1]-1 > 32-1){
        av_log(h->s.avctx, AV_LOG_ERROR, "reference overflow (pps)\n");
        pps->ref_count[0]= pps->ref_count[1]= 1;
        goto fail;
    }

    pps->weighted_pred= get_bits1(&s->gb);
    pps->weighted_bipred_idc= get_bits(&s->gb, 2);
    pps->init_qp= get_se_golomb(&s->gb) + 26;
    pps->init_qs= get_se_golomb(&s->gb) + 26;
    pps->chroma_qp_index_offset[0]= get_se_golomb(&s->gb);
    pps->deblocking_filter_parameters_present= get_bits1(&s->gb);
    pps->constrained_intra_pred= get_bits1(&s->gb);
    pps->redundant_pic_cnt_present = get_bits1(&s->gb);

    pps->transform_8x8_mode= 0;
    h->dequant_coeff_pps= -1; //contents of sps/pps can change even if id doesn't, so reinit
    memcpy(pps->scaling_matrix4, h->sps_buffers[pps->sps_id]->scaling_matrix4, sizeof(pps->scaling_matrix4));
    memcpy(pps->scaling_matrix8, h->sps_buffers[pps->sps_id]->scaling_matrix8, sizeof(pps->scaling_matrix8));

    if(get_bits_count(&s->gb) < bit_length){
        pps->transform_8x8_mode= get_bits1(&s->gb);
        decode_scaling_matrices(h, h->sps_buffers[pps->sps_id], pps, 0, pps->scaling_matrix4, pps->scaling_matrix8);
        pps->chroma_qp_index_offset[1]= get_se_golomb(&s->gb); //second_chroma_qp_index_offset
    } else {
        pps->chroma_qp_index_offset[1]= pps->chroma_qp_index_offset[0];
    }

    build_qp_table(pps, 0, pps->chroma_qp_index_offset[0]);
    build_qp_table(pps, 1, pps->chroma_qp_index_offset[1]);
    if(pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])
        h->pps.chroma_qp_diff= 1;

    if(s->avctx->debug&FF_DEBUG_PICT_INFO){
        av_log(h->s.avctx, AV_LOG_DEBUG, "pps:%u sps:%u %s slice_groups:%d ref:%d/%d %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" : ""
               );
    }

    av_free(h->pps_buffers[pps_id]);
    h->pps_buffers[pps_id]= pps;
    return 0;
fail:
    av_free(pps);
    return -1;
}