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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 libavcodec/h264_ps.c
  24  * H.264 / AVC / MPEG4 part10 parameter set decoding.
  25  * @author Michael Niedermayer <michaelni@gmx.at>
  26  */
  27
  28 #include "internal.h"
  29 #include "dsputil.h"
  30 #include "avcodec.h"
  31 #include "h264.h"
  32 #include "h264data.h" //FIXME FIXME FIXME (just for zigzag_scan)
  33 #include "golomb.h"
  34
  35
  36 //#undef NDEBUG
  37 #include <assert.h>
  38
  39 static const AVRational pixel_aspect[17]={
  40  {0, 1},
  41  {1, 1},
  42  {12, 11},
  43  {10, 11},
  44  {16, 11},
  45  {40, 33},
  46  {24, 11},
  47  {20, 11},
  48  {32, 11},
  49  {80, 33},
  50  {18, 11},
  51  {15, 11},
  52  {64, 33},
  53  {160,99},
  54  {4, 3},
  55  {3, 2},
  56  {2, 1},
  57 };
  58
  59 const uint8_t ff_h264_chroma_qp[52]={
  60     0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,
  61    12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,
  62    28,29,29,30,31,32,32,33,34,34,35,35,36,36,37,37,
  63    37,38,38,38,39,39,39,39
  64 };
  65
  66 static const uint8_t default_scaling4[2][16]={
  67 {   6,13,20,28,
  68    13,20,28,32,
  69    20,28,32,37,
  70    28,32,37,42
  71 },{
  72    10,14,20,24,
  73    14,20,24,27,
  74    20,24,27,30,
  75    24,27,30,34
  76 }};
  77
  78 static const uint8_t default_scaling8[2][64]={
  79 {   6,10,13,16,18,23,25,27,
  80    10,11,16,18,23,25,27,29,
  81    13,16,18,23,25,27,29,31,
  82    16,18,23,25,27,29,31,33,
  83    18,23,25,27,29,31,33,36,
  84    23,25,27,29,31,33,36,38,
  85    25,27,29,31,33,36,38,40,
  86    27,29,31,33,36,38,40,42
  87 },{
  88     9,13,15,17,19,21,22,24,
  89    13,13,17,19,21,22,24,25,
  90    15,17,19,21,22,24,25,27,
  91    17,19,21,22,24,25,27,28,
  92    19,21,22,24,25,27,28,30,
  93    21,22,24,25,27,28,30,32,
  94    22,24,25,27,28,30,32,33,
  95    24,25,27,28,30,32,33,35
  96 }};
  97
  98 static inline int decode_hrd_parameters(H264Context *h, SPS *sps){
  99     MpegEncContext * const s = &h->s;
 100     int cpb_count, i;
 101     cpb_count = get_ue_golomb_31(&s->gb) + 1;
 102
 103     if(cpb_count > 32U){
 104         av_log(h->s.avctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);
 105         return -1;
 106     }
 107
 108     get_bits(&s->gb, 4); /* bit_rate_scale */
 109     get_bits(&s->gb, 4); /* cpb_size_scale */
 110     for(i=0; i<cpb_count; i++){
 111         get_ue_golomb(&s->gb); /* bit_rate_value_minus1 */
 112         get_ue_golomb(&s->gb); /* cpb_size_value_minus1 */
 113         get_bits1(&s->gb);     /* cbr_flag */
 114     }
 115     sps->initial_cpb_removal_delay_length = get_bits(&s->gb, 5) + 1;
 116     sps->cpb_removal_delay_length = get_bits(&s->gb, 5) + 1;
 117     sps->dpb_output_delay_length = get_bits(&s->gb, 5) + 1;
 118     sps->time_offset_length = get_bits(&s->gb, 5);
 119     sps->cpb_cnt = cpb_count;
 120     return 0;
 121 }
 122
 123 static inline int decode_vui_parameters(H264Context *h, SPS *sps){
 124     MpegEncContext * const s = &h->s;
 125     int aspect_ratio_info_present_flag;
 126     unsigned int aspect_ratio_idc;
 127
 128     aspect_ratio_info_present_flag= get_bits1(&s->gb);
 129
 130     if( aspect_ratio_info_present_flag ) {
 131         aspect_ratio_idc= get_bits(&s->gb, 8);
 132         if( aspect_ratio_idc == EXTENDED_SAR ) {
 133             sps->sar.num= get_bits(&s->gb, 16);
 134             sps->sar.den= get_bits(&s->gb, 16);
 135         }else if(aspect_ratio_idc < FF_ARRAY_ELEMS(pixel_aspect)){
 136             sps->sar=  pixel_aspect[aspect_ratio_idc];
 137         }else{
 138             av_log(h->s.avctx, AV_LOG_ERROR, "illegal aspect ratio\n");
 139             return -1;
 140         }
 141     }else{
 142         sps->sar.num=
 143         sps->sar.den= 0;
 144     }
 145 //            s->avctx->aspect_ratio= sar_width*s->width / (float)(s->height*sar_height);
 146
 147     if(get_bits1(&s->gb)){      /* overscan_info_present_flag */
 148         get_bits1(&s->gb);      /* overscan_appropriate_flag */
 149     }
 150
 151     sps->video_signal_type_present_flag = get_bits1(&s->gb);
 152     if(sps->video_signal_type_present_flag){
 153         get_bits(&s->gb, 3);    /* video_format */
 154         sps->full_range = get_bits1(&s->gb); /* video_full_range_flag */
 155
 156         sps->colour_description_present_flag = get_bits1(&s->gb);
 157         if(sps->colour_description_present_flag){
 158             sps->color_primaries = get_bits(&s->gb, 8); /* colour_primaries */
 159             sps->color_trc       = get_bits(&s->gb, 8); /* transfer_characteristics */
 160             sps->colorspace      = get_bits(&s->gb, 8); /* matrix_coefficients */
 161             if (sps->color_primaries >= AVCOL_PRI_NB)
 162                 sps->color_primaries  = AVCOL_PRI_UNSPECIFIED;
 163             if (sps->color_trc >= AVCOL_TRC_NB)
 164                 sps->color_trc  = AVCOL_TRC_UNSPECIFIED;
 165             if (sps->colorspace >= AVCOL_SPC_NB)
 166                 sps->colorspace  = AVCOL_SPC_UNSPECIFIED;
 167         }
 168     }
 169
 170     if(get_bits1(&s->gb)){      /* chroma_location_info_present_flag */
 171         s->avctx->chroma_sample_location = get_ue_golomb(&s->gb)+1;  /* chroma_sample_location_type_top_field */
 172         get_ue_golomb(&s->gb);  /* chroma_sample_location_type_bottom_field */
 173     }
 174
 175     sps->timing_info_present_flag = get_bits1(&s->gb);
 176     if(sps->timing_info_present_flag){
 177         sps->num_units_in_tick = get_bits_long(&s->gb, 32);
 178         sps->time_scale = get_bits_long(&s->gb, 32);
 179         if(sps->num_units_in_tick-1 > 0x7FFFFFFEU || sps->time_scale-1 > 0x7FFFFFFEU){
 180             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);
 181             return -1;
 182         }
 183         sps->fixed_frame_rate_flag = get_bits1(&s->gb);
 184     }
 185
 186     sps->nal_hrd_parameters_present_flag = get_bits1(&s->gb);
 187     if(sps->nal_hrd_parameters_present_flag)
 188         if(decode_hrd_parameters(h, sps) < 0)
 189             return -1;
 190     sps->vcl_hrd_parameters_present_flag = get_bits1(&s->gb);
 191     if(sps->vcl_hrd_parameters_present_flag)
 192         if(decode_hrd_parameters(h, sps) < 0)
 193             return -1;
 194     if(sps->nal_hrd_parameters_present_flag || sps->vcl_hrd_parameters_present_flag)
 195         get_bits1(&s->gb);     /* low_delay_hrd_flag */
 196     sps->pic_struct_present_flag = get_bits1(&s->gb);
 197
 198     sps->bitstream_restriction_flag = get_bits1(&s->gb);
 199     if(sps->bitstream_restriction_flag){
 200         get_bits1(&s->gb);     /* motion_vectors_over_pic_boundaries_flag */
 201         get_ue_golomb(&s->gb); /* max_bytes_per_pic_denom */
 202         get_ue_golomb(&s->gb); /* max_bits_per_mb_denom */
 203         get_ue_golomb(&s->gb); /* log2_max_mv_length_horizontal */
 204         get_ue_golomb(&s->gb); /* log2_max_mv_length_vertical */
 205         sps->num_reorder_frames= get_ue_golomb(&s->gb);
 206         get_ue_golomb(&s->gb); /*max_dec_frame_buffering*/
 207
 208         if(sps->num_reorder_frames > 16U /*max_dec_frame_buffering || max_dec_frame_buffering > 16*/){
 209             av_log(h->s.avctx, AV_LOG_ERROR, "illegal num_reorder_frames %d\n", sps->num_reorder_frames);
 210             return -1;
 211         }
 212     }
 213
 214     return 0;
 215 }
 216
 217 static void decode_scaling_list(H264Context *h, uint8_t *factors, int size,
 218                                 const uint8_t *jvt_list, const uint8_t *fallback_list){
 219     MpegEncContext * const s = &h->s;
 220     int i, last = 8, next = 8;
 221     const uint8_t *scan = size == 16 ? zigzag_scan : ff_zigzag_direct;
 222     if(!get_bits1(&s->gb)) /* matrix not written, we use the predicted one */
 223         memcpy(factors, fallback_list, size*sizeof(uint8_t));
 224     else
 225     for(i=0;i<size;i++){
 226         if(next)
 227             next = (last + get_se_golomb(&s->gb)) & 0xff;
 228         if(!i && !next){ /* matrix not written, we use the preset one */
 229             memcpy(factors, jvt_list, size*sizeof(uint8_t));
 230             break;
 231         }
 232         last = factors[scan[i]] = next ? next : last;
 233     }
 234 }
 235
 236 static void decode_scaling_matrices(H264Context *h, SPS *sps, PPS *pps, int is_sps,
 237                                    uint8_t (*scaling_matrix4)[16], uint8_t (*scaling_matrix8)[64]){
 238     MpegEncContext * const s = &h->s;
 239     int fallback_sps = !is_sps && sps->scaling_matrix_present;
 240     const uint8_t *fallback[4] = {
 241         fallback_sps ? sps->scaling_matrix4[0] : default_scaling4[0],
 242         fallback_sps ? sps->scaling_matrix4[3] : default_scaling4[1],
 243         fallback_sps ? sps->scaling_matrix8[0] : default_scaling8[0],
 244         fallback_sps ? sps->scaling_matrix8[1] : default_scaling8[1]
 245     };
 246     if(get_bits1(&s->gb)){
 247         sps->scaling_matrix_present |= is_sps;
 248         decode_scaling_list(h,scaling_matrix4[0],16,default_scaling4[0],fallback[0]); // Intra, Y
 249         decode_scaling_list(h,scaling_matrix4[1],16,default_scaling4[0],scaling_matrix4[0]); // Intra, Cr
 250         decode_scaling_list(h,scaling_matrix4[2],16,default_scaling4[0],scaling_matrix4[1]); // Intra, Cb
 251         decode_scaling_list(h,scaling_matrix4[3],16,default_scaling4[1],fallback[1]); // Inter, Y
 252         decode_scaling_list(h,scaling_matrix4[4],16,default_scaling4[1],scaling_matrix4[3]); // Inter, Cr
 253         decode_scaling_list(h,scaling_matrix4[5],16,default_scaling4[1],scaling_matrix4[4]); // Inter, Cb
 254         if(is_sps || pps->transform_8x8_mode){
 255             decode_scaling_list(h,scaling_matrix8[0],64,default_scaling8[0],fallback[2]);  // Intra, Y
 256             decode_scaling_list(h,scaling_matrix8[1],64,default_scaling8[1],fallback[3]);  // Inter, Y
 257         }
 258     }
 259 }
 260
 261 int ff_h264_decode_seq_parameter_set(H264Context *h){
 262     MpegEncContext * const s = &h->s;
 263     int profile_idc, level_idc;
 264     unsigned int sps_id;
 265     int i;
 266     SPS *sps;
 267
 268     profile_idc= get_bits(&s->gb, 8);
 269     get_bits1(&s->gb);   //constraint_set0_flag
 270     get_bits1(&s->gb);   //constraint_set1_flag
 271     get_bits1(&s->gb);   //constraint_set2_flag
 272     get_bits1(&s->gb);   //constraint_set3_flag
 273     get_bits(&s->gb, 4); // reserved
 274     level_idc= get_bits(&s->gb, 8);
 275     sps_id= get_ue_golomb_31(&s->gb);
 276
 277     if(sps_id >= MAX_SPS_COUNT) {
 278         av_log(h->s.avctx, AV_LOG_ERROR, "sps_id (%d) out of range\n", sps_id);
 279         return -1;
 280     }
 281     sps= av_mallocz(sizeof(SPS));
 282     if(sps == NULL)
 283         return -1;
 284
 285     sps->profile_idc= profile_idc;
 286     sps->level_idc= level_idc;
 287
 288     memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));
 289     memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));
 290     sps->scaling_matrix_present = 0;
 291
 292     if(sps->profile_idc >= 100){ //high profile
 293         sps->chroma_format_idc= get_ue_golomb_31(&s->gb);
 294         if(sps->chroma_format_idc == 3)
 295             sps->residual_color_transform_flag = get_bits1(&s->gb);
 296         sps->bit_depth_luma   = get_ue_golomb(&s->gb) + 8;
 297         sps->bit_depth_chroma = get_ue_golomb(&s->gb) + 8;
 298         sps->transform_bypass = get_bits1(&s->gb);
 299         decode_scaling_matrices(h, sps, NULL, 1, sps->scaling_matrix4, sps->scaling_matrix8);
 300     }else{
 301         sps->chroma_format_idc= 1;
 302         sps->bit_depth_luma   = 8;
 303         sps->bit_depth_chroma = 8;
 304     }
 305
 306     sps->log2_max_frame_num= get_ue_golomb(&s->gb) + 4;
 307     sps->poc_type= get_ue_golomb_31(&s->gb);
 308
 309     if(sps->poc_type == 0){ //FIXME #define
 310         sps->log2_max_poc_lsb= get_ue_golomb(&s->gb) + 4;
 311     } else if(sps->poc_type == 1){//FIXME #define
 312         sps->delta_pic_order_always_zero_flag= get_bits1(&s->gb);
 313         sps->offset_for_non_ref_pic= get_se_golomb(&s->gb);
 314         sps->offset_for_top_to_bottom_field= get_se_golomb(&s->gb);
 315         sps->poc_cycle_length                = get_ue_golomb(&s->gb);
 316
 317         if((unsigned)sps->poc_cycle_length >= FF_ARRAY_ELEMS(sps->offset_for_ref_frame)){
 318             av_log(h->s.avctx, AV_LOG_ERROR, "poc_cycle_length overflow %u\n", sps->poc_cycle_length);
 319             goto fail;
 320         }
 321
 322         for(i=0; i<sps->poc_cycle_length; i++)
 323             sps->offset_for_ref_frame[i]= get_se_golomb(&s->gb);
 324     }else if(sps->poc_type != 2){
 325         av_log(h->s.avctx, AV_LOG_ERROR, "illegal POC type %d\n", sps->poc_type);
 326         goto fail;
 327     }
 328
 329     sps->ref_frame_count= get_ue_golomb_31(&s->gb);
 330     if(sps->ref_frame_count > MAX_PICTURE_COUNT-2 || sps->ref_frame_count >= 32U){
 331         av_log(h->s.avctx, AV_LOG_ERROR, "too many reference frames\n");
 332         goto fail;
 333     }
 334     sps->gaps_in_frame_num_allowed_flag= get_bits1(&s->gb);
 335     sps->mb_width = get_ue_golomb(&s->gb) + 1;
 336     sps->mb_height= get_ue_golomb(&s->gb) + 1;
 337     if((unsigned)sps->mb_width >= INT_MAX/16 || (unsigned)sps->mb_height >= INT_MAX/16 ||
 338        avcodec_check_dimensions(NULL, 16*sps->mb_width, 16*sps->mb_height)){
 339         av_log(h->s.avctx, AV_LOG_ERROR, "mb_width/height overflow\n");
 340         goto fail;
 341     }
 342
 343     sps->frame_mbs_only_flag= get_bits1(&s->gb);
 344     if(!sps->frame_mbs_only_flag)
 345         sps->mb_aff= get_bits1(&s->gb);
 346     else
 347         sps->mb_aff= 0;
 348
 349     sps->direct_8x8_inference_flag= get_bits1(&s->gb);
 350
 351 #ifndef ALLOW_INTERLACE
 352     if(sps->mb_aff)
 353         av_log(h->s.avctx, AV_LOG_ERROR, "MBAFF support not included; enable it at compile-time.\n");
 354 #endif
 355     sps->crop= get_bits1(&s->gb);
 356     if(sps->crop){
 357         sps->crop_left  = get_ue_golomb(&s->gb);
 358         sps->crop_right = get_ue_golomb(&s->gb);
 359         sps->crop_top   = get_ue_golomb(&s->gb);
 360         sps->crop_bottom= get_ue_golomb(&s->gb);
 361         if(sps->crop_left || sps->crop_top){
 362             av_log(h->s.avctx, AV_LOG_ERROR, "insane cropping not completely supported, this could look slightly wrong ...\n");
 363         }
 364         if(sps->crop_right >= 8 || sps->crop_bottom >= (8>> !sps->frame_mbs_only_flag)){
 365             av_log(h->s.avctx, AV_LOG_ERROR, "brainfart cropping not supported, this could look slightly wrong ...\n");
 366         }
 367     }else{
 368         sps->crop_left  =
 369         sps->crop_right =
 370         sps->crop_top   =
 371         sps->crop_bottom= 0;
 372     }
 373
 374     sps->vui_parameters_present_flag= get_bits1(&s->gb);
 375     if( sps->vui_parameters_present_flag )
 376         if (decode_vui_parameters(h, sps) < 0)
 377             goto fail;
 378
 379     if(s->avctx->debug&FF_DEBUG_PICT_INFO){
 380         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",
 381                sps_id, sps->profile_idc, sps->level_idc,
 382                sps->poc_type,
 383                sps->ref_frame_count,
 384                sps->mb_width, sps->mb_height,
 385                sps->frame_mbs_only_flag ? "FRM" : (sps->mb_aff ? "MB-AFF" : "PIC-AFF"),
 386                sps->direct_8x8_inference_flag ? "8B8" : "",
 387                sps->crop_left, sps->crop_right,
 388                sps->crop_top, sps->crop_bottom,
 389                sps->vui_parameters_present_flag ? "VUI" : "",
 390                ((const char*[]){"Gray","420","422","444"})[sps->chroma_format_idc],
 391                sps->timing_info_present_flag ? sps->num_units_in_tick : 0,
 392                sps->timing_info_present_flag ? sps->time_scale : 0
 393                );
 394     }
 395
 396     av_free(h->sps_buffers[sps_id]);
 397     h->sps_buffers[sps_id]= sps;
 398     h->sps = *sps;
 399     return 0;
 400 fail:
 401     av_free(sps);
 402     return -1;
 403 }
 404
 405 static void
 406 build_qp_table(PPS *pps, int t, int index)
 407 {
 408     int i;
 409     for(i = 0; i < 52; i++)
 410         pps->chroma_qp_table[t][i] = ff_h264_chroma_qp[av_clip(i + index, 0, 51)];
 411 }
 412
 413 int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length){
 414     MpegEncContext * const s = &h->s;
 415     unsigned int pps_id= get_ue_golomb(&s->gb);
 416     PPS *pps;
 417
 418     if(pps_id >= MAX_PPS_COUNT) {
 419         av_log(h->s.avctx, AV_LOG_ERROR, "pps_id (%d) out of range\n", pps_id);
 420         return -1;
 421     }
 422
 423     pps= av_mallocz(sizeof(PPS));
 424     if(pps == NULL)
 425         return -1;
 426     pps->sps_id= get_ue_golomb_31(&s->gb);
 427     if((unsigned)pps->sps_id>=MAX_SPS_COUNT || h->sps_buffers[pps->sps_id] == NULL){
 428         av_log(h->s.avctx, AV_LOG_ERROR, "sps_id out of range\n");
 429         goto fail;
 430     }
 431
 432     pps->cabac= get_bits1(&s->gb);
 433     pps->pic_order_present= get_bits1(&s->gb);
 434     pps->slice_group_count= get_ue_golomb(&s->gb) + 1;
 435     if(pps->slice_group_count > 1 ){
 436         pps->mb_slice_group_map_type= get_ue_golomb(&s->gb);
 437         av_log(h->s.avctx, AV_LOG_ERROR, "FMO not supported\n");
 438         switch(pps->mb_slice_group_map_type){
 439         case 0:
 440 #if 0
 441 |   for( i = 0; i <= num_slice_groups_minus1; i++ ) |   |        |
 442 |    run_length[ i ]                                |1  |ue(v)   |
 443 #endif
 444             break;
 445         case 2:
 446 #if 0
 447 |   for( i = 0; i < num_slice_groups_minus1; i++ )  |   |        |
 448 |{                                                  |   |        |
 449 |    top_left_mb[ i ]                               |1  |ue(v)   |
 450 |    bottom_right_mb[ i ]                           |1  |ue(v)   |
 451 |   }                                               |   |        |
 452 #endif
 453             break;
 454         case 3:
 455         case 4:
 456         case 5:
 457 #if 0
 458 |   slice_group_change_direction_flag               |1  |u(1)    |
 459 |   slice_group_change_rate_minus1                  |1  |ue(v)   |
 460 #endif
 461             break;
 462         case 6:
 463 #if 0
 464 |   slice_group_id_cnt_minus1                       |1  |ue(v)   |
 465 |   for( i = 0; i <= slice_group_id_cnt_minus1; i++ |   |        |
 466 |)                                                  |   |        |
 467 |    slice_group_id[ i ]                            |1  |u(v)    |
 468 #endif
 469             break;
 470         }
 471     }
 472     pps->ref_count[0]= get_ue_golomb(&s->gb) + 1;
 473     pps->ref_count[1]= get_ue_golomb(&s->gb) + 1;
 474     if(pps->ref_count[0]-1 > 32-1 || pps->ref_count[1]-1 > 32-1){
 475         av_log(h->s.avctx, AV_LOG_ERROR, "reference overflow (pps)\n");
 476         goto fail;
 477     }
 478
 479     pps->weighted_pred= get_bits1(&s->gb);
 480     pps->weighted_bipred_idc= get_bits(&s->gb, 2);
 481     pps->init_qp= get_se_golomb(&s->gb) + 26;
 482     pps->init_qs= get_se_golomb(&s->gb) + 26;
 483     pps->chroma_qp_index_offset[0]= get_se_golomb(&s->gb);
 484     pps->deblocking_filter_parameters_present= get_bits1(&s->gb);
 485     pps->constrained_intra_pred= get_bits1(&s->gb);
 486     pps->redundant_pic_cnt_present = get_bits1(&s->gb);
 487
 488     pps->transform_8x8_mode= 0;
 489     h->dequant_coeff_pps= -1; //contents of sps/pps can change even if id doesn't, so reinit
 490     memcpy(pps->scaling_matrix4, h->sps_buffers[pps->sps_id]->scaling_matrix4, sizeof(pps->scaling_matrix4));
 491     memcpy(pps->scaling_matrix8, h->sps_buffers[pps->sps_id]->scaling_matrix8, sizeof(pps->scaling_matrix8));
 492
 493     if(get_bits_count(&s->gb) < bit_length){
 494         pps->transform_8x8_mode= get_bits1(&s->gb);
 495         decode_scaling_matrices(h, h->sps_buffers[pps->sps_id], pps, 0, pps->scaling_matrix4, pps->scaling_matrix8);
 496         pps->chroma_qp_index_offset[1]= get_se_golomb(&s->gb); //second_chroma_qp_index_offset
 497     } else {
 498         pps->chroma_qp_index_offset[1]= pps->chroma_qp_index_offset[0];
 499     }
 500
 501     build_qp_table(pps, 0, pps->chroma_qp_index_offset[0]);
 502     build_qp_table(pps, 1, pps->chroma_qp_index_offset[1]);
 503     if(pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])
 504         pps->chroma_qp_diff= 1;
 505
 506     if(s->avctx->debug&FF_DEBUG_PICT_INFO){
 507         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",
 508                pps_id, pps->sps_id,
 509                pps->cabac ? "CABAC" : "CAVLC",
 510                pps->slice_group_count,
 511                pps->ref_count[0], pps->ref_count[1],
 512                pps->weighted_pred ? "weighted" : "",
 513                pps->init_qp, pps->init_qs, pps->chroma_qp_index_offset[0], pps->chroma_qp_index_offset[1],
 514                pps->deblocking_filter_parameters_present ? "LPAR" : "",
 515                pps->constrained_intra_pred ? "CONSTR" : "",
 516                pps->redundant_pic_cnt_present ? "REDU" : "",
 517                pps->transform_8x8_mode ? "8x8DCT" : ""
 518                );
 519     }
 520
 521     av_free(h->pps_buffers[pps_id]);
 522     h->pps_buffers[pps_id]= pps;
 523     return 0;
 524 fail:
 525     av_free(pps);
 526     return -1;
 527 }