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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 Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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 "libavutil/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 #define QP(qP,depth) ( (qP)+6*((depth)-8) )
  61
  62 #define CHROMA_QP_TABLE_END(d) \
  63      QP(0,d),  QP(1,d),  QP(2,d),  QP(3,d),  QP(4,d),  QP(5,d),\
  64      QP(6,d),  QP(7,d),  QP(8,d),  QP(9,d), QP(10,d), QP(11,d),\
  65     QP(12,d), QP(13,d), QP(14,d), QP(15,d), QP(16,d), QP(17,d),\
  66     QP(18,d), QP(19,d), QP(20,d), QP(21,d), QP(22,d), QP(23,d),\
  67     QP(24,d), QP(25,d), QP(26,d), QP(27,d), QP(28,d), QP(29,d),\
  68     QP(29,d), QP(30,d), QP(31,d), QP(32,d), QP(32,d), QP(33,d),\
  69     QP(34,d), QP(34,d), QP(35,d), QP(35,d), QP(36,d), QP(36,d),\
  70     QP(37,d), QP(37,d), QP(37,d), QP(38,d), QP(38,d), QP(38,d),\
  71     QP(39,d), QP(39,d), QP(39,d), QP(39,d)
  72
  73 const uint8_t ff_h264_chroma_qp[3][QP_MAX_NUM+1] = {
  74     {
  75         CHROMA_QP_TABLE_END(8)
  76     },
  77     {
  78         0, 1, 2, 3, 4, 5,
  79         CHROMA_QP_TABLE_END(9)
  80     },
  81     {
  82         0, 1, 2, 3,  4,  5,
  83         6, 7, 8, 9, 10, 11,
  84         CHROMA_QP_TABLE_END(10)
  85     },
  86 };
  87
  88 static const uint8_t default_scaling4[2][16]={
  89 {   6,13,20,28,
  90    13,20,28,32,
  91    20,28,32,37,
  92    28,32,37,42
  93 },{
  94    10,14,20,24,
  95    14,20,24,27,
  96    20,24,27,30,
  97    24,27,30,34
  98 }};
  99
 100 static const uint8_t default_scaling8[2][64]={
 101 {   6,10,13,16,18,23,25,27,
 102    10,11,16,18,23,25,27,29,
 103    13,16,18,23,25,27,29,31,
 104    16,18,23,25,27,29,31,33,
 105    18,23,25,27,29,31,33,36,
 106    23,25,27,29,31,33,36,38,
 107    25,27,29,31,33,36,38,40,
 108    27,29,31,33,36,38,40,42
 109 },{
 110     9,13,15,17,19,21,22,24,
 111    13,13,17,19,21,22,24,25,
 112    15,17,19,21,22,24,25,27,
 113    17,19,21,22,24,25,27,28,
 114    19,21,22,24,25,27,28,30,
 115    21,22,24,25,27,28,30,32,
 116    22,24,25,27,28,30,32,33,
 117    24,25,27,28,30,32,33,35
 118 }};
 119
 120 static inline int decode_hrd_parameters(H264Context *h, SPS *sps){
 121     MpegEncContext * const s = &h->s;
 122     int cpb_count, i;
 123     cpb_count = get_ue_golomb_31(&s->gb) + 1;
 124
 125     if(cpb_count > 32U){
 126         av_log(h->s.avctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);
 127         return -1;
 128     }
 129
 130     get_bits(&s->gb, 4); /* bit_rate_scale */
 131     get_bits(&s->gb, 4); /* cpb_size_scale */
 132     for(i=0; i<cpb_count; i++){
 133         get_ue_golomb_long(&s->gb); /* bit_rate_value_minus1 */
 134         get_ue_golomb_long(&s->gb); /* cpb_size_value_minus1 */
 135         get_bits1(&s->gb);     /* cbr_flag */
 136     }
 137     sps->initial_cpb_removal_delay_length = get_bits(&s->gb, 5) + 1;
 138     sps->cpb_removal_delay_length = get_bits(&s->gb, 5) + 1;
 139     sps->dpb_output_delay_length = get_bits(&s->gb, 5) + 1;
 140     sps->time_offset_length = get_bits(&s->gb, 5);
 141     sps->cpb_cnt = cpb_count;
 142     return 0;
 143 }
 144
 145 static inline int decode_vui_parameters(H264Context *h, SPS *sps){
 146     MpegEncContext * const s = &h->s;
 147     int aspect_ratio_info_present_flag;
 148     unsigned int aspect_ratio_idc;
 149
 150     aspect_ratio_info_present_flag= get_bits1(&s->gb);
 151
 152     if( aspect_ratio_info_present_flag ) {
 153         aspect_ratio_idc= get_bits(&s->gb, 8);
 154         if( aspect_ratio_idc == EXTENDED_SAR ) {
 155             sps->sar.num= get_bits(&s->gb, 16);
 156             sps->sar.den= get_bits(&s->gb, 16);
 157         }else if(aspect_ratio_idc < FF_ARRAY_ELEMS(pixel_aspect)){
 158             sps->sar=  pixel_aspect[aspect_ratio_idc];
 159         }else{
 160             av_log(h->s.avctx, AV_LOG_ERROR, "illegal aspect ratio\n");
 161             return -1;
 162         }
 163     }else{
 164         sps->sar.num=
 165         sps->sar.den= 0;
 166     }
 167 //            s->avctx->aspect_ratio= sar_width*s->width / (float)(s->height*sar_height);
 168
 169     if(get_bits1(&s->gb)){      /* overscan_info_present_flag */
 170         get_bits1(&s->gb);      /* overscan_appropriate_flag */
 171     }
 172
 173     sps->video_signal_type_present_flag = get_bits1(&s->gb);
 174     if(sps->video_signal_type_present_flag){
 175         get_bits(&s->gb, 3);    /* video_format */
 176         sps->full_range = get_bits1(&s->gb); /* video_full_range_flag */
 177
 178         sps->colour_description_present_flag = get_bits1(&s->gb);
 179         if(sps->colour_description_present_flag){
 180             sps->color_primaries = get_bits(&s->gb, 8); /* colour_primaries */
 181             sps->color_trc       = get_bits(&s->gb, 8); /* transfer_characteristics */
 182             sps->colorspace      = get_bits(&s->gb, 8); /* matrix_coefficients */
 183             if (sps->color_primaries >= AVCOL_PRI_NB)
 184                 sps->color_primaries  = AVCOL_PRI_UNSPECIFIED;
 185             if (sps->color_trc >= AVCOL_TRC_NB)
 186                 sps->color_trc  = AVCOL_TRC_UNSPECIFIED;
 187             if (sps->colorspace >= AVCOL_SPC_NB)
 188                 sps->colorspace  = AVCOL_SPC_UNSPECIFIED;
 189         }
 190     }
 191
 192     if(get_bits1(&s->gb)){      /* chroma_location_info_present_flag */
 193         s->avctx->chroma_sample_location = get_ue_golomb(&s->gb)+1;  /* chroma_sample_location_type_top_field */
 194         get_ue_golomb(&s->gb);  /* chroma_sample_location_type_bottom_field */
 195     }
 196
 197     sps->timing_info_present_flag = get_bits1(&s->gb);
 198     if(sps->timing_info_present_flag){
 199         sps->num_units_in_tick = get_bits_long(&s->gb, 32);
 200         sps->time_scale = get_bits_long(&s->gb, 32);
 201         if(!sps->num_units_in_tick || !sps->time_scale){
 202             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);
 203             return -1;
 204         }
 205         sps->fixed_frame_rate_flag = get_bits1(&s->gb);
 206     }
 207
 208     sps->nal_hrd_parameters_present_flag = get_bits1(&s->gb);
 209     if(sps->nal_hrd_parameters_present_flag)
 210         if(decode_hrd_parameters(h, sps) < 0)
 211             return -1;
 212     sps->vcl_hrd_parameters_present_flag = get_bits1(&s->gb);
 213     if(sps->vcl_hrd_parameters_present_flag)
 214         if(decode_hrd_parameters(h, sps) < 0)
 215             return -1;
 216     if(sps->nal_hrd_parameters_present_flag || sps->vcl_hrd_parameters_present_flag)
 217         get_bits1(&s->gb);     /* low_delay_hrd_flag */
 218     sps->pic_struct_present_flag = get_bits1(&s->gb);
 219
 220     sps->bitstream_restriction_flag = get_bits1(&s->gb);
 221     if(sps->bitstream_restriction_flag){
 222         get_bits1(&s->gb);     /* motion_vectors_over_pic_boundaries_flag */
 223         get_ue_golomb(&s->gb); /* max_bytes_per_pic_denom */
 224         get_ue_golomb(&s->gb); /* max_bits_per_mb_denom */
 225         get_ue_golomb(&s->gb); /* log2_max_mv_length_horizontal */
 226         get_ue_golomb(&s->gb); /* log2_max_mv_length_vertical */
 227         sps->num_reorder_frames= get_ue_golomb(&s->gb);
 228         get_ue_golomb(&s->gb); /*max_dec_frame_buffering*/
 229
 230         if (get_bits_left(&s->gb) < 0) {
 231             sps->num_reorder_frames=0;
 232             sps->bitstream_restriction_flag= 0;
 233         }
 234
 235         if(sps->num_reorder_frames > 16U /*max_dec_frame_buffering || max_dec_frame_buffering > 16*/){
 236             av_log(h->s.avctx, AV_LOG_ERROR, "illegal num_reorder_frames %d\n", sps->num_reorder_frames);
 237             return -1;
 238         }
 239     }
 240     if (get_bits_left(&s->gb) < 0) {
 241         av_log(h->s.avctx, AV_LOG_ERROR, "Overread VUI by %d bits\n", -get_bits_left(&s->gb));
 242         return AVERROR_INVALIDDATA;
 243     }
 244
 245     return 0;
 246 }
 247
 248 static void decode_scaling_list(H264Context *h, uint8_t *factors, int size,
 249                                 const uint8_t *jvt_list, const uint8_t *fallback_list){
 250     MpegEncContext * const s = &h->s;
 251     int i, last = 8, next = 8;
 252     const uint8_t *scan = size == 16 ? zigzag_scan : ff_zigzag_direct;
 253     if(!get_bits1(&s->gb)) /* matrix not written, we use the predicted one */
 254         memcpy(factors, fallback_list, size*sizeof(uint8_t));
 255     else
 256     for(i=0;i<size;i++){
 257         if(next)
 258             next = (last + get_se_golomb(&s->gb)) & 0xff;
 259         if(!i && !next){ /* matrix not written, we use the preset one */
 260             memcpy(factors, jvt_list, size*sizeof(uint8_t));
 261             break;
 262         }
 263         last = factors[scan[i]] = next ? next : last;
 264     }
 265 }
 266
 267 static void decode_scaling_matrices(H264Context *h, SPS *sps, PPS *pps, int is_sps,
 268                                    uint8_t (*scaling_matrix4)[16], uint8_t (*scaling_matrix8)[64]){
 269     MpegEncContext * const s = &h->s;
 270     int fallback_sps = !is_sps && sps->scaling_matrix_present;
 271     const uint8_t *fallback[4] = {
 272         fallback_sps ? sps->scaling_matrix4[0] : default_scaling4[0],
 273         fallback_sps ? sps->scaling_matrix4[3] : default_scaling4[1],
 274         fallback_sps ? sps->scaling_matrix8[0] : default_scaling8[0],
 275         fallback_sps ? sps->scaling_matrix8[3] : default_scaling8[1]
 276     };
 277     if(get_bits1(&s->gb)){
 278         sps->scaling_matrix_present |= is_sps;
 279         decode_scaling_list(h,scaling_matrix4[0],16,default_scaling4[0],fallback[0]); // Intra, Y
 280         decode_scaling_list(h,scaling_matrix4[1],16,default_scaling4[0],scaling_matrix4[0]); // Intra, Cr
 281         decode_scaling_list(h,scaling_matrix4[2],16,default_scaling4[0],scaling_matrix4[1]); // Intra, Cb
 282         decode_scaling_list(h,scaling_matrix4[3],16,default_scaling4[1],fallback[1]); // Inter, Y
 283         decode_scaling_list(h,scaling_matrix4[4],16,default_scaling4[1],scaling_matrix4[3]); // Inter, Cr
 284         decode_scaling_list(h,scaling_matrix4[5],16,default_scaling4[1],scaling_matrix4[4]); // Inter, Cb
 285         if(is_sps || pps->transform_8x8_mode){
 286             decode_scaling_list(h,scaling_matrix8[0],64,default_scaling8[0],fallback[2]);  // Intra, Y
 287             if(sps->chroma_format_idc == 3){
 288                 decode_scaling_list(h,scaling_matrix8[1],64,default_scaling8[0],scaling_matrix8[0]);  // Intra, Cr
 289                 decode_scaling_list(h,scaling_matrix8[2],64,default_scaling8[0],scaling_matrix8[1]);  // Intra, Cb
 290             }
 291             decode_scaling_list(h,scaling_matrix8[3],64,default_scaling8[1],fallback[3]);  // Inter, Y
 292             if(sps->chroma_format_idc == 3){
 293                 decode_scaling_list(h,scaling_matrix8[4],64,default_scaling8[1],scaling_matrix8[3]);  // Inter, Cr
 294                 decode_scaling_list(h,scaling_matrix8[5],64,default_scaling8[1],scaling_matrix8[4]);  // Inter, Cb
 295             }
 296         }
 297     }
 298 }
 299
 300 int ff_h264_decode_seq_parameter_set(H264Context *h){
 301     MpegEncContext * const s = &h->s;
 302     int profile_idc, level_idc, constraint_set_flags = 0;
 303     unsigned int sps_id;
 304     int i;
 305     SPS *sps;
 306
 307     profile_idc= get_bits(&s->gb, 8);
 308     constraint_set_flags |= get_bits1(&s->gb) << 0;   //constraint_set0_flag
 309     constraint_set_flags |= get_bits1(&s->gb) << 1;   //constraint_set1_flag
 310     constraint_set_flags |= get_bits1(&s->gb) << 2;   //constraint_set2_flag
 311     constraint_set_flags |= get_bits1(&s->gb) << 3;   //constraint_set3_flag
 312     get_bits(&s->gb, 4); // reserved
 313     level_idc= get_bits(&s->gb, 8);
 314     sps_id= get_ue_golomb_31(&s->gb);
 315
 316     if(sps_id >= MAX_SPS_COUNT) {
 317         av_log(h->s.avctx, AV_LOG_ERROR, "sps_id (%d) out of range\n", sps_id);
 318         return -1;
 319     }
 320     sps= av_mallocz(sizeof(SPS));
 321     if(sps == NULL)
 322         return -1;
 323
 324     sps->time_offset_length = 24;
 325     sps->profile_idc= profile_idc;
 326     sps->constraint_set_flags = constraint_set_flags;
 327     sps->level_idc= level_idc;
 328
 329     memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));
 330     memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));
 331     sps->scaling_matrix_present = 0;
 332
 333     if(sps->profile_idc >= 100){ //high profile
 334         sps->chroma_format_idc= get_ue_golomb_31(&s->gb);
 335         if(sps->chroma_format_idc > 3) {
 336             av_log(h->s.avctx, AV_LOG_ERROR, "chroma_format_idc (%u) out of range\n", sps->chroma_format_idc);
 337             goto fail;
 338         } else if(sps->chroma_format_idc == 3) {
 339             sps->residual_color_transform_flag = get_bits1(&s->gb);
 340         }
 341         sps->bit_depth_luma   = get_ue_golomb(&s->gb) + 8;
 342         sps->bit_depth_chroma = get_ue_golomb(&s->gb) + 8;
 343         sps->transform_bypass = get_bits1(&s->gb);
 344         decode_scaling_matrices(h, sps, NULL, 1, sps->scaling_matrix4, sps->scaling_matrix8);
 345     }else{
 346         sps->chroma_format_idc= 1;
 347         sps->bit_depth_luma   = 8;
 348         sps->bit_depth_chroma = 8;
 349     }
 350
 351     sps->log2_max_frame_num= get_ue_golomb(&s->gb) + 4;
 352     sps->poc_type= get_ue_golomb_31(&s->gb);
 353
 354     if(sps->poc_type == 0){ //FIXME #define
 355         sps->log2_max_poc_lsb= get_ue_golomb(&s->gb) + 4;
 356     } else if(sps->poc_type == 1){//FIXME #define
 357         sps->delta_pic_order_always_zero_flag= get_bits1(&s->gb);
 358         sps->offset_for_non_ref_pic= get_se_golomb(&s->gb);
 359         sps->offset_for_top_to_bottom_field= get_se_golomb(&s->gb);
 360         sps->poc_cycle_length                = get_ue_golomb(&s->gb);
 361
 362         if((unsigned)sps->poc_cycle_length >= FF_ARRAY_ELEMS(sps->offset_for_ref_frame)){
 363             av_log(h->s.avctx, AV_LOG_ERROR, "poc_cycle_length overflow %u\n", sps->poc_cycle_length);
 364             goto fail;
 365         }
 366
 367         for(i=0; i<sps->poc_cycle_length; i++)
 368             sps->offset_for_ref_frame[i]= get_se_golomb(&s->gb);
 369     }else if(sps->poc_type != 2){
 370         av_log(h->s.avctx, AV_LOG_ERROR, "illegal POC type %d\n", sps->poc_type);
 371         goto fail;
 372     }
 373
 374     sps->ref_frame_count= get_ue_golomb_31(&s->gb);
 375     if(sps->ref_frame_count > MAX_PICTURE_COUNT-2 || sps->ref_frame_count >= 32U){
 376         av_log(h->s.avctx, AV_LOG_ERROR, "too many reference frames\n");
 377         goto fail;
 378     }
 379     sps->gaps_in_frame_num_allowed_flag= get_bits1(&s->gb);
 380     sps->mb_width = get_ue_golomb(&s->gb) + 1;
 381     sps->mb_height= get_ue_golomb(&s->gb) + 1;
 382     if((unsigned)sps->mb_width >= INT_MAX/16 || (unsigned)sps->mb_height >= INT_MAX/16 ||
 383        av_image_check_size(16*sps->mb_width, 16*sps->mb_height, 0, h->s.avctx)){
 384         av_log(h->s.avctx, AV_LOG_ERROR, "mb_width/height overflow\n");
 385         goto fail;
 386     }
 387
 388     sps->frame_mbs_only_flag= get_bits1(&s->gb);
 389     if(!sps->frame_mbs_only_flag)
 390         sps->mb_aff= get_bits1(&s->gb);
 391     else
 392         sps->mb_aff= 0;
 393
 394     sps->direct_8x8_inference_flag= get_bits1(&s->gb);
 395     if(!sps->frame_mbs_only_flag && !sps->direct_8x8_inference_flag){
 396         av_log(h->s.avctx, AV_LOG_ERROR, "This stream was generated by a broken encoder, invalid 8x8 inference\n");
 397         goto fail;
 398     }
 399
 400 #ifndef ALLOW_INTERLACE
 401     if(sps->mb_aff)
 402         av_log(h->s.avctx, AV_LOG_ERROR, "MBAFF support not included; enable it at compile-time.\n");
 403 #endif
 404     sps->crop= get_bits1(&s->gb);
 405     if(sps->crop){
 406         int crop_vertical_limit   = sps->chroma_format_idc  & 2 ? 16 : 8;
 407         int crop_horizontal_limit = sps->chroma_format_idc == 3 ? 16 : 8;
 408         sps->crop_left  = get_ue_golomb(&s->gb);
 409         sps->crop_right = get_ue_golomb(&s->gb);
 410         sps->crop_top   = get_ue_golomb(&s->gb);
 411         sps->crop_bottom= get_ue_golomb(&s->gb);
 412         if(sps->crop_left || sps->crop_top){
 413             av_log(h->s.avctx, AV_LOG_ERROR, "insane cropping not completely supported, this could look slightly wrong ...\n");
 414         }
 415         if(sps->crop_right >= crop_horizontal_limit || sps->crop_bottom >= crop_vertical_limit){
 416             av_log(h->s.avctx, AV_LOG_ERROR, "brainfart cropping not supported, this could look slightly wrong ...\n");
 417         }
 418     }else{
 419         sps->crop_left  =
 420         sps->crop_right =
 421         sps->crop_top   =
 422         sps->crop_bottom= 0;
 423     }
 424
 425     sps->vui_parameters_present_flag= get_bits1(&s->gb);
 426     if( sps->vui_parameters_present_flag )
 427         if (decode_vui_parameters(h, sps) < 0)
 428             goto fail;
 429
 430     if(!sps->sar.den)
 431         sps->sar.den= 1;
 432
 433     if(s->avctx->debug&FF_DEBUG_PICT_INFO){
 434         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",
 435                sps_id, sps->profile_idc, sps->level_idc,
 436                sps->poc_type,
 437                sps->ref_frame_count,
 438                sps->mb_width, sps->mb_height,
 439                sps->frame_mbs_only_flag ? "FRM" : (sps->mb_aff ? "MB-AFF" : "PIC-AFF"),
 440                sps->direct_8x8_inference_flag ? "8B8" : "",
 441                sps->crop_left, sps->crop_right,
 442                sps->crop_top, sps->crop_bottom,
 443                sps->vui_parameters_present_flag ? "VUI" : "",
 444                ((const char*[]){"Gray","420","422","444"})[sps->chroma_format_idc],
 445                sps->timing_info_present_flag ? sps->num_units_in_tick : 0,
 446                sps->timing_info_present_flag ? sps->time_scale : 0
 447                );
 448     }
 449
 450     av_free(h->sps_buffers[sps_id]);
 451     h->sps_buffers[sps_id]= sps;
 452     h->sps = *sps;
 453     return 0;
 454 fail:
 455     av_free(sps);
 456     return -1;
 457 }
 458
 459 static void
 460 build_qp_table(PPS *pps, int t, int index, const int depth)
 461 {
 462     int i;
 463     const int max_qp = 51 + 6*(depth-8);
 464     for(i = 0; i < max_qp+1; i++)
 465         pps->chroma_qp_table[t][i] = ff_h264_chroma_qp[depth-8][av_clip(i + index, 0, max_qp)];
 466 }
 467
 468 int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length){
 469     MpegEncContext * const s = &h->s;
 470     unsigned int pps_id= get_ue_golomb(&s->gb);
 471     PPS *pps;
 472     const int qp_bd_offset = 6*(h->sps.bit_depth_luma-8);
 473     int bits_left;
 474
 475     if(pps_id >= MAX_PPS_COUNT) {
 476         av_log(h->s.avctx, AV_LOG_ERROR, "pps_id (%d) out of range\n", pps_id);
 477         return -1;
 478     }
 479
 480     pps= av_mallocz(sizeof(PPS));
 481     if(pps == NULL)
 482         return -1;
 483     pps->sps_id= get_ue_golomb_31(&s->gb);
 484     if((unsigned)pps->sps_id>=MAX_SPS_COUNT || h->sps_buffers[pps->sps_id] == NULL){
 485         av_log(h->s.avctx, AV_LOG_ERROR, "sps_id out of range\n");
 486         goto fail;
 487     }
 488
 489     pps->cabac= get_bits1(&s->gb);
 490     pps->pic_order_present= get_bits1(&s->gb);
 491     pps->slice_group_count= get_ue_golomb(&s->gb) + 1;
 492     if(pps->slice_group_count > 1 ){
 493         pps->mb_slice_group_map_type= get_ue_golomb(&s->gb);
 494         av_log(h->s.avctx, AV_LOG_ERROR, "FMO not supported\n");
 495         switch(pps->mb_slice_group_map_type){
 496         case 0:
 497 #if 0
 498 |   for( i = 0; i <= num_slice_groups_minus1; i++ ) |   |        |
 499 |    run_length[ i ]                                |1  |ue(v)   |
 500 #endif
 501             break;
 502         case 2:
 503 #if 0
 504 |   for( i = 0; i < num_slice_groups_minus1; i++ )  |   |        |
 505 |{                                                  |   |        |
 506 |    top_left_mb[ i ]                               |1  |ue(v)   |
 507 |    bottom_right_mb[ i ]                           |1  |ue(v)   |
 508 |   }                                               |   |        |
 509 #endif
 510             break;
 511         case 3:
 512         case 4:
 513         case 5:
 514 #if 0
 515 |   slice_group_change_direction_flag               |1  |u(1)    |
 516 |   slice_group_change_rate_minus1                  |1  |ue(v)   |
 517 #endif
 518             break;
 519         case 6:
 520 #if 0
 521 |   slice_group_id_cnt_minus1                       |1  |ue(v)   |
 522 |   for( i = 0; i <= slice_group_id_cnt_minus1; i++ |   |        |
 523 |)                                                  |   |        |
 524 |    slice_group_id[ i ]                            |1  |u(v)    |
 525 #endif
 526             break;
 527         }
 528     }
 529     pps->ref_count[0]= get_ue_golomb(&s->gb) + 1;
 530     pps->ref_count[1]= get_ue_golomb(&s->gb) + 1;
 531     if(pps->ref_count[0]-1 > 32-1 || pps->ref_count[1]-1 > 32-1){
 532         av_log(h->s.avctx, AV_LOG_ERROR, "reference overflow (pps)\n");
 533         goto fail;
 534     }
 535
 536     pps->weighted_pred= get_bits1(&s->gb);
 537     pps->weighted_bipred_idc= get_bits(&s->gb, 2);
 538     pps->init_qp= get_se_golomb(&s->gb) + 26 + qp_bd_offset;
 539     pps->init_qs= get_se_golomb(&s->gb) + 26 + qp_bd_offset;
 540     pps->chroma_qp_index_offset[0]= get_se_golomb(&s->gb);
 541     pps->deblocking_filter_parameters_present= get_bits1(&s->gb);
 542     pps->constrained_intra_pred= get_bits1(&s->gb);
 543     pps->redundant_pic_cnt_present = get_bits1(&s->gb);
 544
 545     pps->transform_8x8_mode= 0;
 546     h->dequant_coeff_pps= -1; //contents of sps/pps can change even if id doesn't, so reinit
 547     memcpy(pps->scaling_matrix4, h->sps_buffers[pps->sps_id]->scaling_matrix4, sizeof(pps->scaling_matrix4));
 548     memcpy(pps->scaling_matrix8, h->sps_buffers[pps->sps_id]->scaling_matrix8, sizeof(pps->scaling_matrix8));
 549
 550     bits_left = bit_length - get_bits_count(&s->gb);
 551     if (bits_left && (bits_left > 8 ||
 552                       show_bits(&s->gb, bits_left) != 1 << (bits_left - 1))) {
 553         pps->transform_8x8_mode= get_bits1(&s->gb);
 554         decode_scaling_matrices(h, h->sps_buffers[pps->sps_id], pps, 0, pps->scaling_matrix4, pps->scaling_matrix8);
 555         pps->chroma_qp_index_offset[1]= get_se_golomb(&s->gb); //second_chroma_qp_index_offset
 556     } else {
 557         pps->chroma_qp_index_offset[1]= pps->chroma_qp_index_offset[0];
 558     }
 559
 560     build_qp_table(pps, 0, pps->chroma_qp_index_offset[0], h->sps.bit_depth_luma);
 561     build_qp_table(pps, 1, pps->chroma_qp_index_offset[1], h->sps.bit_depth_luma);
 562     if(pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])
 563         pps->chroma_qp_diff= 1;
 564
 565     if(s->avctx->debug&FF_DEBUG_PICT_INFO){
 566         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",
 567                pps_id, pps->sps_id,
 568                pps->cabac ? "CABAC" : "CAVLC",
 569                pps->slice_group_count,
 570                pps->ref_count[0], pps->ref_count[1],
 571                pps->weighted_pred ? "weighted" : "",
 572                pps->init_qp, pps->init_qs, pps->chroma_qp_index_offset[0], pps->chroma_qp_index_offset[1],
 573                pps->deblocking_filter_parameters_present ? "LPAR" : "",
 574                pps->constrained_intra_pred ? "CONSTR" : "",
 575                pps->redundant_pic_cnt_present ? "REDU" : "",
 576                pps->transform_8x8_mode ? "8x8DCT" : ""
 577                );
 578     }
 579
 580     av_free(h->pps_buffers[pps_id]);
 581     h->pps_buffers[pps_id]= pps;
 582     return 0;
 583 fail:
 584     av_free(pps);
 585     return -1;
 586 }