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   1 /*
   2  * H.26L/H.264/AVC/JVT/14496-10/... parameter set decoding
   3  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * H.264 / AVC / MPEG4 part10 parameter set decoding.
  25  * @author Michael Niedermayer <michaelni@gmx.at>
  26  */
  27
  28 #include "libavcore/imgutils.h"
  29 #include "internal.h"
  30 #include "dsputil.h"
  31 #include "avcodec.h"
  32 #include "h264.h"
  33 #include "h264data.h" //FIXME FIXME FIXME (just for zigzag_scan)
  34 #include "golomb.h"
  35
  36
  37 //#undef NDEBUG
  38 #include <assert.h>
  39
  40 static const AVRational pixel_aspect[17]={
  41  {0, 1},
  42  {1, 1},
  43  {12, 11},
  44  {10, 11},
  45  {16, 11},
  46  {40, 33},
  47  {24, 11},
  48  {20, 11},
  49  {32, 11},
  50  {80, 33},
  51  {18, 11},
  52  {15, 11},
  53  {64, 33},
  54  {160,99},
  55  {4, 3},
  56  {3, 2},
  57  {2, 1},
  58 };
  59
  60 const uint8_t ff_h264_chroma_qp[52]={
  61     0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,
  62    12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,
  63    28,29,29,30,31,32,32,33,34,34,35,35,36,36,37,37,
  64    37,38,38,38,39,39,39,39
  65 };
  66
  67 static const uint8_t default_scaling4[2][16]={
  68 {   6,13,20,28,
  69    13,20,28,32,
  70    20,28,32,37,
  71    28,32,37,42
  72 },{
  73    10,14,20,24,
  74    14,20,24,27,
  75    20,24,27,30,
  76    24,27,30,34
  77 }};
  78
  79 static const uint8_t default_scaling8[2][64]={
  80 {   6,10,13,16,18,23,25,27,
  81    10,11,16,18,23,25,27,29,
  82    13,16,18,23,25,27,29,31,
  83    16,18,23,25,27,29,31,33,
  84    18,23,25,27,29,31,33,36,
  85    23,25,27,29,31,33,36,38,
  86    25,27,29,31,33,36,38,40,
  87    27,29,31,33,36,38,40,42
  88 },{
  89     9,13,15,17,19,21,22,24,
  90    13,13,17,19,21,22,24,25,
  91    15,17,19,21,22,24,25,27,
  92    17,19,21,22,24,25,27,28,
  93    19,21,22,24,25,27,28,30,
  94    21,22,24,25,27,28,30,32,
  95    22,24,25,27,28,30,32,33,
  96    24,25,27,28,30,32,33,35
  97 }};
  98
  99 static inline int decode_hrd_parameters(H264Context *h, SPS *sps){
 100     MpegEncContext * const s = &h->s;
 101     int cpb_count, i;
 102     cpb_count = get_ue_golomb_31(&s->gb) + 1;
 103
 104     if(cpb_count > 32U){
 105         av_log(h->s.avctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);
 106         return -1;
 107     }
 108
 109     get_bits(&s->gb, 4); /* bit_rate_scale */
 110     get_bits(&s->gb, 4); /* cpb_size_scale */
 111     for(i=0; i<cpb_count; i++){
 112         get_ue_golomb(&s->gb); /* bit_rate_value_minus1 */
 113         get_ue_golomb(&s->gb); /* cpb_size_value_minus1 */
 114         get_bits1(&s->gb);     /* cbr_flag */
 115     }
 116     sps->initial_cpb_removal_delay_length = get_bits(&s->gb, 5) + 1;
 117     sps->cpb_removal_delay_length = get_bits(&s->gb, 5) + 1;
 118     sps->dpb_output_delay_length = get_bits(&s->gb, 5) + 1;
 119     sps->time_offset_length = get_bits(&s->gb, 5);
 120     sps->cpb_cnt = cpb_count;
 121     return 0;
 122 }
 123
 124 static inline int decode_vui_parameters(H264Context *h, SPS *sps){
 125     MpegEncContext * const s = &h->s;
 126     int aspect_ratio_info_present_flag;
 127     unsigned int aspect_ratio_idc;
 128
 129     aspect_ratio_info_present_flag= get_bits1(&s->gb);
 130
 131     if( aspect_ratio_info_present_flag ) {
 132         aspect_ratio_idc= get_bits(&s->gb, 8);
 133         if( aspect_ratio_idc == EXTENDED_SAR ) {
 134             sps->sar.num= get_bits(&s->gb, 16);
 135             sps->sar.den= get_bits(&s->gb, 16);
 136         }else if(aspect_ratio_idc < FF_ARRAY_ELEMS(pixel_aspect)){
 137             sps->sar=  pixel_aspect[aspect_ratio_idc];
 138         }else{
 139             av_log(h->s.avctx, AV_LOG_ERROR, "illegal aspect ratio\n");
 140             return -1;
 141         }
 142     }else{
 143         sps->sar.num=
 144         sps->sar.den= 0;
 145     }
 146 //            s->avctx->aspect_ratio= sar_width*s->width / (float)(s->height*sar_height);
 147
 148     if(get_bits1(&s->gb)){      /* overscan_info_present_flag */
 149         get_bits1(&s->gb);      /* overscan_appropriate_flag */
 150     }
 151
 152     sps->video_signal_type_present_flag = get_bits1(&s->gb);
 153     if(sps->video_signal_type_present_flag){
 154         get_bits(&s->gb, 3);    /* video_format */
 155         sps->full_range = get_bits1(&s->gb); /* video_full_range_flag */
 156
 157         sps->colour_description_present_flag = get_bits1(&s->gb);
 158         if(sps->colour_description_present_flag){
 159             sps->color_primaries = get_bits(&s->gb, 8); /* colour_primaries */
 160             sps->color_trc       = get_bits(&s->gb, 8); /* transfer_characteristics */
 161             sps->colorspace      = get_bits(&s->gb, 8); /* matrix_coefficients */
 162             if (sps->color_primaries >= AVCOL_PRI_NB)
 163                 sps->color_primaries  = AVCOL_PRI_UNSPECIFIED;
 164             if (sps->color_trc >= AVCOL_TRC_NB)
 165                 sps->color_trc  = AVCOL_TRC_UNSPECIFIED;
 166             if (sps->colorspace >= AVCOL_SPC_NB)
 167                 sps->colorspace  = AVCOL_SPC_UNSPECIFIED;
 168         }
 169     }
 170
 171     if(get_bits1(&s->gb)){      /* chroma_location_info_present_flag */
 172         s->avctx->chroma_sample_location = get_ue_golomb(&s->gb)+1;  /* chroma_sample_location_type_top_field */
 173         get_ue_golomb(&s->gb);  /* chroma_sample_location_type_bottom_field */
 174     }
 175
 176     sps->timing_info_present_flag = get_bits1(&s->gb);
 177     if(sps->timing_info_present_flag){
 178         sps->num_units_in_tick = get_bits_long(&s->gb, 32);
 179         sps->time_scale = get_bits_long(&s->gb, 32);
 180         if(!sps->num_units_in_tick || !sps->time_scale){
 181             av_log(h->s.avctx, AV_LOG_ERROR, "time_scale/num_units_in_tick invalid or unsupported (%d/%d)\n", sps->time_scale, sps->num_units_in_tick);
 182             return -1;
 183         }
 184         sps->fixed_frame_rate_flag = get_bits1(&s->gb);
 185     }
 186
 187     sps->nal_hrd_parameters_present_flag = get_bits1(&s->gb);
 188     if(sps->nal_hrd_parameters_present_flag)
 189         if(decode_hrd_parameters(h, sps) < 0)
 190             return -1;
 191     sps->vcl_hrd_parameters_present_flag = get_bits1(&s->gb);
 192     if(sps->vcl_hrd_parameters_present_flag)
 193         if(decode_hrd_parameters(h, sps) < 0)
 194             return -1;
 195     if(sps->nal_hrd_parameters_present_flag || sps->vcl_hrd_parameters_present_flag)
 196         get_bits1(&s->gb);     /* low_delay_hrd_flag */
 197     sps->pic_struct_present_flag = get_bits1(&s->gb);
 198
 199     sps->bitstream_restriction_flag = get_bits1(&s->gb);
 200     if(sps->bitstream_restriction_flag){
 201         get_bits1(&s->gb);     /* motion_vectors_over_pic_boundaries_flag */
 202         get_ue_golomb(&s->gb); /* max_bytes_per_pic_denom */
 203         get_ue_golomb(&s->gb); /* max_bits_per_mb_denom */
 204         get_ue_golomb(&s->gb); /* log2_max_mv_length_horizontal */
 205         get_ue_golomb(&s->gb); /* log2_max_mv_length_vertical */
 206         sps->num_reorder_frames= get_ue_golomb(&s->gb);
 207         get_ue_golomb(&s->gb); /*max_dec_frame_buffering*/
 208
 209         if(s->gb.size_in_bits < get_bits_count(&s->gb)){
 210             av_log(h->s.avctx, AV_LOG_ERROR, "Overread VUI by %d bits\n", get_bits_count(&s->gb) - s->gb.size_in_bits);
 211             sps->num_reorder_frames=0;
 212             sps->bitstream_restriction_flag= 0;
 213         }
 214
 215         if(sps->num_reorder_frames > 16U /*max_dec_frame_buffering || max_dec_frame_buffering > 16*/){
 216             av_log(h->s.avctx, AV_LOG_ERROR, "illegal num_reorder_frames %d\n", sps->num_reorder_frames);
 217             return -1;
 218         }
 219     }
 220
 221     return 0;
 222 }
 223
 224 static void decode_scaling_list(H264Context *h, uint8_t *factors, int size,
 225                                 const uint8_t *jvt_list, const uint8_t *fallback_list){
 226     MpegEncContext * const s = &h->s;
 227     int i, last = 8, next = 8;
 228     const uint8_t *scan = size == 16 ? zigzag_scan : ff_zigzag_direct;
 229     if(!get_bits1(&s->gb)) /* matrix not written, we use the predicted one */
 230         memcpy(factors, fallback_list, size*sizeof(uint8_t));
 231     else
 232     for(i=0;i<size;i++){
 233         if(next)
 234             next = (last + get_se_golomb(&s->gb)) & 0xff;
 235         if(!i && !next){ /* matrix not written, we use the preset one */
 236             memcpy(factors, jvt_list, size*sizeof(uint8_t));
 237             break;
 238         }
 239         last = factors[scan[i]] = next ? next : last;
 240     }
 241 }
 242
 243 static void decode_scaling_matrices(H264Context *h, SPS *sps, PPS *pps, int is_sps,
 244                                    uint8_t (*scaling_matrix4)[16], uint8_t (*scaling_matrix8)[64]){
 245     MpegEncContext * const s = &h->s;
 246     int fallback_sps = !is_sps && sps->scaling_matrix_present;
 247     const uint8_t *fallback[4] = {
 248         fallback_sps ? sps->scaling_matrix4[0] : default_scaling4[0],
 249         fallback_sps ? sps->scaling_matrix4[3] : default_scaling4[1],
 250         fallback_sps ? sps->scaling_matrix8[0] : default_scaling8[0],
 251         fallback_sps ? sps->scaling_matrix8[1] : default_scaling8[1]
 252     };
 253     if(get_bits1(&s->gb)){
 254         sps->scaling_matrix_present |= is_sps;
 255         decode_scaling_list(h,scaling_matrix4[0],16,default_scaling4[0],fallback[0]); // Intra, Y
 256         decode_scaling_list(h,scaling_matrix4[1],16,default_scaling4[0],scaling_matrix4[0]); // Intra, Cr
 257         decode_scaling_list(h,scaling_matrix4[2],16,default_scaling4[0],scaling_matrix4[1]); // Intra, Cb
 258         decode_scaling_list(h,scaling_matrix4[3],16,default_scaling4[1],fallback[1]); // Inter, Y
 259         decode_scaling_list(h,scaling_matrix4[4],16,default_scaling4[1],scaling_matrix4[3]); // Inter, Cr
 260         decode_scaling_list(h,scaling_matrix4[5],16,default_scaling4[1],scaling_matrix4[4]); // Inter, Cb
 261         if(is_sps || pps->transform_8x8_mode){
 262             decode_scaling_list(h,scaling_matrix8[0],64,default_scaling8[0],fallback[2]);  // Intra, Y
 263             decode_scaling_list(h,scaling_matrix8[1],64,default_scaling8[1],fallback[3]);  // Inter, Y
 264         }
 265     }
 266 }
 267
 268 int ff_h264_decode_seq_parameter_set(H264Context *h){
 269     MpegEncContext * const s = &h->s;
 270     int profile_idc, level_idc;
 271     unsigned int sps_id;
 272     int i;
 273     SPS *sps;
 274
 275     profile_idc= get_bits(&s->gb, 8);
 276     get_bits1(&s->gb);   //constraint_set0_flag
 277     get_bits1(&s->gb);   //constraint_set1_flag
 278     get_bits1(&s->gb);   //constraint_set2_flag
 279     get_bits1(&s->gb);   //constraint_set3_flag
 280     get_bits(&s->gb, 4); // reserved
 281     level_idc= get_bits(&s->gb, 8);
 282     sps_id= get_ue_golomb_31(&s->gb);
 283
 284     if(sps_id >= MAX_SPS_COUNT) {
 285         av_log(h->s.avctx, AV_LOG_ERROR, "sps_id (%d) out of range\n", sps_id);
 286         return -1;
 287     }
 288     sps= av_mallocz(sizeof(SPS));
 289     if(sps == NULL)
 290         return -1;
 291
 292     sps->profile_idc= profile_idc;
 293     sps->level_idc= level_idc;
 294
 295     memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));
 296     memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));
 297     sps->scaling_matrix_present = 0;
 298
 299     if(sps->profile_idc >= 100){ //high profile
 300         sps->chroma_format_idc= get_ue_golomb_31(&s->gb);
 301         if(sps->chroma_format_idc == 3)
 302             sps->residual_color_transform_flag = get_bits1(&s->gb);
 303         sps->bit_depth_luma   = get_ue_golomb(&s->gb) + 8;
 304         sps->bit_depth_chroma = get_ue_golomb(&s->gb) + 8;
 305         sps->transform_bypass = get_bits1(&s->gb);
 306         decode_scaling_matrices(h, sps, NULL, 1, sps->scaling_matrix4, sps->scaling_matrix8);
 307     }else{
 308         sps->chroma_format_idc= 1;
 309         sps->bit_depth_luma   = 8;
 310         sps->bit_depth_chroma = 8;
 311     }
 312
 313     sps->log2_max_frame_num= get_ue_golomb(&s->gb) + 4;
 314     sps->poc_type= get_ue_golomb_31(&s->gb);
 315
 316     if(sps->poc_type == 0){ //FIXME #define
 317         sps->log2_max_poc_lsb= get_ue_golomb(&s->gb) + 4;
 318     } else if(sps->poc_type == 1){//FIXME #define
 319         sps->delta_pic_order_always_zero_flag= get_bits1(&s->gb);
 320         sps->offset_for_non_ref_pic= get_se_golomb(&s->gb);
 321         sps->offset_for_top_to_bottom_field= get_se_golomb(&s->gb);
 322         sps->poc_cycle_length                = get_ue_golomb(&s->gb);
 323
 324         if((unsigned)sps->poc_cycle_length >= FF_ARRAY_ELEMS(sps->offset_for_ref_frame)){
 325             av_log(h->s.avctx, AV_LOG_ERROR, "poc_cycle_length overflow %u\n", sps->poc_cycle_length);
 326             goto fail;
 327         }
 328
 329         for(i=0; i<sps->poc_cycle_length; i++)
 330             sps->offset_for_ref_frame[i]= get_se_golomb(&s->gb);
 331     }else if(sps->poc_type != 2){
 332         av_log(h->s.avctx, AV_LOG_ERROR, "illegal POC type %d\n", sps->poc_type);
 333         goto fail;
 334     }
 335
 336     sps->ref_frame_count= get_ue_golomb_31(&s->gb);
 337     if(sps->ref_frame_count > MAX_PICTURE_COUNT-2 || sps->ref_frame_count >= 32U){
 338         av_log(h->s.avctx, AV_LOG_ERROR, "too many reference frames\n");
 339         goto fail;
 340     }
 341     sps->gaps_in_frame_num_allowed_flag= get_bits1(&s->gb);
 342     sps->mb_width = get_ue_golomb(&s->gb) + 1;
 343     sps->mb_height= get_ue_golomb(&s->gb) + 1;
 344     if((unsigned)sps->mb_width >= INT_MAX/16 || (unsigned)sps->mb_height >= INT_MAX/16 ||
 345        av_check_image_size(16*sps->mb_width, 16*sps->mb_height, 0, h->s.avctx)){
 346         av_log(h->s.avctx, AV_LOG_ERROR, "mb_width/height overflow\n");
 347         goto fail;
 348     }
 349
 350     sps->frame_mbs_only_flag= get_bits1(&s->gb);
 351     if(!sps->frame_mbs_only_flag)
 352         sps->mb_aff= get_bits1(&s->gb);
 353     else
 354         sps->mb_aff= 0;
 355
 356     sps->direct_8x8_inference_flag= get_bits1(&s->gb);
 357     if(!sps->frame_mbs_only_flag && !sps->direct_8x8_inference_flag){
 358         av_log(h->s.avctx, AV_LOG_ERROR, "This stream was generated by a broken encoder, invalid 8x8 inference\n");
 359         goto fail;
 360     }
 361
 362 #ifndef ALLOW_INTERLACE
 363     if(sps->mb_aff)
 364         av_log(h->s.avctx, AV_LOG_ERROR, "MBAFF support not included; enable it at compile-time.\n");
 365 #endif
 366     sps->crop= get_bits1(&s->gb);
 367     if(sps->crop){
 368         sps->crop_left  = get_ue_golomb(&s->gb);
 369         sps->crop_right = get_ue_golomb(&s->gb);
 370         sps->crop_top   = get_ue_golomb(&s->gb);
 371         sps->crop_bottom= get_ue_golomb(&s->gb);
 372         if(sps->crop_left || sps->crop_top){
 373             av_log(h->s.avctx, AV_LOG_ERROR, "insane cropping not completely supported, this could look slightly wrong ...\n");
 374         }
 375         if(sps->crop_right >= 8 || sps->crop_bottom >= (8>> !sps->frame_mbs_only_flag)){
 376             av_log(h->s.avctx, AV_LOG_ERROR, "brainfart cropping not supported, this could look slightly wrong ...\n");
 377         }
 378     }else{
 379         sps->crop_left  =
 380         sps->crop_right =
 381         sps->crop_top   =
 382         sps->crop_bottom= 0;
 383     }
 384
 385     sps->vui_parameters_present_flag= get_bits1(&s->gb);
 386     if( sps->vui_parameters_present_flag )
 387         if (decode_vui_parameters(h, sps) < 0)
 388             goto fail;
 389
 390     if(s->avctx->debug&FF_DEBUG_PICT_INFO){
 391         av_log(h->s.avctx, AV_LOG_DEBUG, "sps:%u profile:%d/%d poc:%d ref:%d %dx%d %s %s crop:%d/%d/%d/%d %s %s %d/%d\n",
 392                sps_id, sps->profile_idc, sps->level_idc,
 393                sps->poc_type,
 394                sps->ref_frame_count,
 395                sps->mb_width, sps->mb_height,
 396                sps->frame_mbs_only_flag ? "FRM" : (sps->mb_aff ? "MB-AFF" : "PIC-AFF"),
 397                sps->direct_8x8_inference_flag ? "8B8" : "",
 398                sps->crop_left, sps->crop_right,
 399                sps->crop_top, sps->crop_bottom,
 400                sps->vui_parameters_present_flag ? "VUI" : "",
 401                ((const char*[]){"Gray","420","422","444"})[sps->chroma_format_idc],
 402                sps->timing_info_present_flag ? sps->num_units_in_tick : 0,
 403                sps->timing_info_present_flag ? sps->time_scale : 0
 404                );
 405     }
 406
 407     av_free(h->sps_buffers[sps_id]);
 408     h->sps_buffers[sps_id]= sps;
 409     h->sps = *sps;
 410     return 0;
 411 fail:
 412     av_free(sps);
 413     return -1;
 414 }
 415
 416 static void
 417 build_qp_table(PPS *pps, int t, int index)
 418 {
 419     int i;
 420     for(i = 0; i < 52; i++)
 421         pps->chroma_qp_table[t][i] = ff_h264_chroma_qp[av_clip(i + index, 0, 51)];
 422 }
 423
 424 int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length){
 425     MpegEncContext * const s = &h->s;
 426     unsigned int pps_id= get_ue_golomb(&s->gb);
 427     PPS *pps;
 428
 429     if(pps_id >= MAX_PPS_COUNT) {
 430         av_log(h->s.avctx, AV_LOG_ERROR, "pps_id (%d) out of range\n", pps_id);
 431         return -1;
 432     }
 433
 434     pps= av_mallocz(sizeof(PPS));
 435     if(pps == NULL)
 436         return -1;
 437     pps->sps_id= get_ue_golomb_31(&s->gb);
 438     if((unsigned)pps->sps_id>=MAX_SPS_COUNT || h->sps_buffers[pps->sps_id] == NULL){
 439         av_log(h->s.avctx, AV_LOG_ERROR, "sps_id out of range\n");
 440         goto fail;
 441     }
 442
 443     pps->cabac= get_bits1(&s->gb);
 444     pps->pic_order_present= get_bits1(&s->gb);
 445     pps->slice_group_count= get_ue_golomb(&s->gb) + 1;
 446     if(pps->slice_group_count > 1 ){
 447         pps->mb_slice_group_map_type= get_ue_golomb(&s->gb);
 448         av_log(h->s.avctx, AV_LOG_ERROR, "FMO not supported\n");
 449         switch(pps->mb_slice_group_map_type){
 450         case 0:
 451 #if 0
 452 |   for( i = 0; i <= num_slice_groups_minus1; i++ ) |   |        |
 453 |    run_length[ i ]                                |1  |ue(v)   |
 454 #endif
 455             break;
 456         case 2:
 457 #if 0
 458 |   for( i = 0; i < num_slice_groups_minus1; i++ )  |   |        |
 459 |{                                                  |   |        |
 460 |    top_left_mb[ i ]                               |1  |ue(v)   |
 461 |    bottom_right_mb[ i ]                           |1  |ue(v)   |
 462 |   }                                               |   |        |
 463 #endif
 464             break;
 465         case 3:
 466         case 4:
 467         case 5:
 468 #if 0
 469 |   slice_group_change_direction_flag               |1  |u(1)    |
 470 |   slice_group_change_rate_minus1                  |1  |ue(v)   |
 471 #endif
 472             break;
 473         case 6:
 474 #if 0
 475 |   slice_group_id_cnt_minus1                       |1  |ue(v)   |
 476 |   for( i = 0; i <= slice_group_id_cnt_minus1; i++ |   |        |
 477 |)                                                  |   |        |
 478 |    slice_group_id[ i ]                            |1  |u(v)    |
 479 #endif
 480             break;
 481         }
 482     }
 483     pps->ref_count[0]= get_ue_golomb(&s->gb) + 1;
 484     pps->ref_count[1]= get_ue_golomb(&s->gb) + 1;
 485     if(pps->ref_count[0]-1 > 32-1 || pps->ref_count[1]-1 > 32-1){
 486         av_log(h->s.avctx, AV_LOG_ERROR, "reference overflow (pps)\n");
 487         goto fail;
 488     }
 489
 490     pps->weighted_pred= get_bits1(&s->gb);
 491     pps->weighted_bipred_idc= get_bits(&s->gb, 2);
 492     pps->init_qp= get_se_golomb(&s->gb) + 26;
 493     pps->init_qs= get_se_golomb(&s->gb) + 26;
 494     pps->chroma_qp_index_offset[0]= get_se_golomb(&s->gb);
 495     pps->deblocking_filter_parameters_present= get_bits1(&s->gb);
 496     pps->constrained_intra_pred= get_bits1(&s->gb);
 497     pps->redundant_pic_cnt_present = get_bits1(&s->gb);
 498
 499     pps->transform_8x8_mode= 0;
 500     h->dequant_coeff_pps= -1; //contents of sps/pps can change even if id doesn't, so reinit
 501     memcpy(pps->scaling_matrix4, h->sps_buffers[pps->sps_id]->scaling_matrix4, sizeof(pps->scaling_matrix4));
 502     memcpy(pps->scaling_matrix8, h->sps_buffers[pps->sps_id]->scaling_matrix8, sizeof(pps->scaling_matrix8));
 503
 504     if(get_bits_count(&s->gb) < bit_length){
 505         pps->transform_8x8_mode= get_bits1(&s->gb);
 506         decode_scaling_matrices(h, h->sps_buffers[pps->sps_id], pps, 0, pps->scaling_matrix4, pps->scaling_matrix8);
 507         pps->chroma_qp_index_offset[1]= get_se_golomb(&s->gb); //second_chroma_qp_index_offset
 508     } else {
 509         pps->chroma_qp_index_offset[1]= pps->chroma_qp_index_offset[0];
 510     }
 511
 512     build_qp_table(pps, 0, pps->chroma_qp_index_offset[0]);
 513     build_qp_table(pps, 1, pps->chroma_qp_index_offset[1]);
 514     if(pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])
 515         pps->chroma_qp_diff= 1;
 516
 517     if(s->avctx->debug&FF_DEBUG_PICT_INFO){
 518         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",
 519                pps_id, pps->sps_id,
 520                pps->cabac ? "CABAC" : "CAVLC",
 521                pps->slice_group_count,
 522                pps->ref_count[0], pps->ref_count[1],
 523                pps->weighted_pred ? "weighted" : "",
 524                pps->init_qp, pps->init_qs, pps->chroma_qp_index_offset[0], pps->chroma_qp_index_offset[1],
 525                pps->deblocking_filter_parameters_present ? "LPAR" : "",
 526                pps->constrained_intra_pred ? "CONSTR" : "",
 527                pps->redundant_pic_cnt_present ? "REDU" : "",
 528                pps->transform_8x8_mode ? "8x8DCT" : ""
 529                );
 530     }
 531
 532     av_free(h->pps_buffers[pps_id]);
 533     h->pps_buffers[pps_id]= pps;
 534     return 0;
 535 fail:
 536     av_free(pps);
 537     return -1;
 538 }