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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(&s->gb); /* bit_rate_value_minus1 */
 134         get_ue_golomb(&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(s->gb.size_in_bits < get_bits_count(&s->gb)){
 231             av_log(h->s.avctx, AV_LOG_ERROR, "Overread VUI by %d bits\n", get_bits_count(&s->gb) - s->gb.size_in_bits);
 232             sps->num_reorder_frames=0;
 233             sps->bitstream_restriction_flag= 0;
 234         }
 235
 236         if(sps->num_reorder_frames > 16U /*max_dec_frame_buffering || max_dec_frame_buffering > 16*/){
 237             av_log(h->s.avctx, AV_LOG_ERROR, "illegal num_reorder_frames %d\n", sps->num_reorder_frames);
 238             return -1;
 239         }
 240     }
 241
 242     return 0;
 243 }
 244
 245 static void decode_scaling_list(H264Context *h, uint8_t *factors, int size,
 246                                 const uint8_t *jvt_list, const uint8_t *fallback_list){
 247     MpegEncContext * const s = &h->s;
 248     int i, last = 8, next = 8;
 249     const uint8_t *scan = size == 16 ? zigzag_scan : ff_zigzag_direct;
 250     if(!get_bits1(&s->gb)) /* matrix not written, we use the predicted one */
 251         memcpy(factors, fallback_list, size*sizeof(uint8_t));
 252     else
 253     for(i=0;i<size;i++){
 254         if(next)
 255             next = (last + get_se_golomb(&s->gb)) & 0xff;
 256         if(!i && !next){ /* matrix not written, we use the preset one */
 257             memcpy(factors, jvt_list, size*sizeof(uint8_t));
 258             break;
 259         }
 260         last = factors[scan[i]] = next ? next : last;
 261     }
 262 }
 263
 264 static void decode_scaling_matrices(H264Context *h, SPS *sps, PPS *pps, int is_sps,
 265                                    uint8_t (*scaling_matrix4)[16], uint8_t (*scaling_matrix8)[64]){
 266     MpegEncContext * const s = &h->s;
 267     int fallback_sps = !is_sps && sps->scaling_matrix_present;
 268     const uint8_t *fallback[4] = {
 269         fallback_sps ? sps->scaling_matrix4[0] : default_scaling4[0],
 270         fallback_sps ? sps->scaling_matrix4[3] : default_scaling4[1],
 271         fallback_sps ? sps->scaling_matrix8[0] : default_scaling8[0],
 272         fallback_sps ? sps->scaling_matrix8[3] : default_scaling8[1]
 273     };
 274     if(get_bits1(&s->gb)){
 275         sps->scaling_matrix_present |= is_sps;
 276         decode_scaling_list(h,scaling_matrix4[0],16,default_scaling4[0],fallback[0]); // Intra, Y
 277         decode_scaling_list(h,scaling_matrix4[1],16,default_scaling4[0],scaling_matrix4[0]); // Intra, Cr
 278         decode_scaling_list(h,scaling_matrix4[2],16,default_scaling4[0],scaling_matrix4[1]); // Intra, Cb
 279         decode_scaling_list(h,scaling_matrix4[3],16,default_scaling4[1],fallback[1]); // Inter, Y
 280         decode_scaling_list(h,scaling_matrix4[4],16,default_scaling4[1],scaling_matrix4[3]); // Inter, Cr
 281         decode_scaling_list(h,scaling_matrix4[5],16,default_scaling4[1],scaling_matrix4[4]); // Inter, Cb
 282         if(is_sps || pps->transform_8x8_mode){
 283             decode_scaling_list(h,scaling_matrix8[0],64,default_scaling8[0],fallback[2]);  // Intra, Y
 284             if(sps->chroma_format_idc == 3){
 285                 decode_scaling_list(h,scaling_matrix8[1],64,default_scaling8[0],scaling_matrix8[0]);  // Intra, Cr
 286                 decode_scaling_list(h,scaling_matrix8[2],64,default_scaling8[0],scaling_matrix8[1]);  // Intra, Cb
 287             }
 288             decode_scaling_list(h,scaling_matrix8[3],64,default_scaling8[1],fallback[3]);  // Inter, Y
 289             if(sps->chroma_format_idc == 3){
 290                 decode_scaling_list(h,scaling_matrix8[4],64,default_scaling8[1],scaling_matrix8[3]);  // Inter, Cr
 291                 decode_scaling_list(h,scaling_matrix8[5],64,default_scaling8[1],scaling_matrix8[4]);  // Inter, Cb
 292             }
 293         }
 294     }
 295 }
 296
 297 int ff_h264_decode_seq_parameter_set(H264Context *h){
 298     MpegEncContext * const s = &h->s;
 299     int profile_idc, level_idc, constraint_set_flags = 0;
 300     unsigned int sps_id;
 301     int i;
 302     SPS *sps;
 303
 304     profile_idc= get_bits(&s->gb, 8);
 305     constraint_set_flags |= get_bits1(&s->gb) << 0;   //constraint_set0_flag
 306     constraint_set_flags |= get_bits1(&s->gb) << 1;   //constraint_set1_flag
 307     constraint_set_flags |= get_bits1(&s->gb) << 2;   //constraint_set2_flag
 308     constraint_set_flags |= get_bits1(&s->gb) << 3;   //constraint_set3_flag
 309     get_bits(&s->gb, 4); // reserved
 310     level_idc= get_bits(&s->gb, 8);
 311     sps_id= get_ue_golomb_31(&s->gb);
 312
 313     if(sps_id >= MAX_SPS_COUNT) {
 314         av_log(h->s.avctx, AV_LOG_ERROR, "sps_id (%d) out of range\n", sps_id);
 315         return -1;
 316     }
 317     sps= av_mallocz(sizeof(SPS));
 318     if(sps == NULL)
 319         return -1;
 320
 321     sps->time_offset_length = 24;
 322     sps->profile_idc= profile_idc;
 323     sps->constraint_set_flags = constraint_set_flags;
 324     sps->level_idc= level_idc;
 325
 326     memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));
 327     memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));
 328     sps->scaling_matrix_present = 0;
 329
 330     if(sps->profile_idc >= 100){ //high profile
 331         sps->chroma_format_idc= get_ue_golomb_31(&s->gb);
 332         if(sps->chroma_format_idc == 3)
 333             sps->residual_color_transform_flag = get_bits1(&s->gb);
 334         sps->bit_depth_luma   = get_ue_golomb(&s->gb) + 8;
 335         sps->bit_depth_chroma = get_ue_golomb(&s->gb) + 8;
 336         sps->transform_bypass = get_bits1(&s->gb);
 337         decode_scaling_matrices(h, sps, NULL, 1, sps->scaling_matrix4, sps->scaling_matrix8);
 338     }else{
 339         sps->chroma_format_idc= 1;
 340         sps->bit_depth_luma   = 8;
 341         sps->bit_depth_chroma = 8;
 342     }
 343
 344     sps->log2_max_frame_num= get_ue_golomb(&s->gb) + 4;
 345     sps->poc_type= get_ue_golomb_31(&s->gb);
 346
 347     if(sps->poc_type == 0){ //FIXME #define
 348         sps->log2_max_poc_lsb= get_ue_golomb(&s->gb) + 4;
 349     } else if(sps->poc_type == 1){//FIXME #define
 350         sps->delta_pic_order_always_zero_flag= get_bits1(&s->gb);
 351         sps->offset_for_non_ref_pic= get_se_golomb(&s->gb);
 352         sps->offset_for_top_to_bottom_field= get_se_golomb(&s->gb);
 353         sps->poc_cycle_length                = get_ue_golomb(&s->gb);
 354
 355         if((unsigned)sps->poc_cycle_length >= FF_ARRAY_ELEMS(sps->offset_for_ref_frame)){
 356             av_log(h->s.avctx, AV_LOG_ERROR, "poc_cycle_length overflow %u\n", sps->poc_cycle_length);
 357             goto fail;
 358         }
 359
 360         for(i=0; i<sps->poc_cycle_length; i++)
 361             sps->offset_for_ref_frame[i]= get_se_golomb(&s->gb);
 362     }else if(sps->poc_type != 2){
 363         av_log(h->s.avctx, AV_LOG_ERROR, "illegal POC type %d\n", sps->poc_type);
 364         goto fail;
 365     }
 366
 367     sps->ref_frame_count= get_ue_golomb_31(&s->gb);
 368     if(sps->ref_frame_count > MAX_PICTURE_COUNT-2 || sps->ref_frame_count >= 32U){
 369         av_log(h->s.avctx, AV_LOG_ERROR, "too many reference frames\n");
 370         goto fail;
 371     }
 372     sps->gaps_in_frame_num_allowed_flag= get_bits1(&s->gb);
 373     sps->mb_width = get_ue_golomb(&s->gb) + 1;
 374     sps->mb_height= get_ue_golomb(&s->gb) + 1;
 375     if((unsigned)sps->mb_width >= INT_MAX/16 || (unsigned)sps->mb_height >= INT_MAX/16 ||
 376        av_image_check_size(16*sps->mb_width, 16*sps->mb_height, 0, h->s.avctx)){
 377         av_log(h->s.avctx, AV_LOG_ERROR, "mb_width/height overflow\n");
 378         goto fail;
 379     }
 380
 381     sps->frame_mbs_only_flag= get_bits1(&s->gb);
 382     if(!sps->frame_mbs_only_flag)
 383         sps->mb_aff= get_bits1(&s->gb);
 384     else
 385         sps->mb_aff= 0;
 386
 387     sps->direct_8x8_inference_flag= get_bits1(&s->gb);
 388     if(!sps->frame_mbs_only_flag && !sps->direct_8x8_inference_flag){
 389         av_log(h->s.avctx, AV_LOG_ERROR, "This stream was generated by a broken encoder, invalid 8x8 inference\n");
 390         goto fail;
 391     }
 392
 393 #ifndef ALLOW_INTERLACE
 394     if(sps->mb_aff)
 395         av_log(h->s.avctx, AV_LOG_ERROR, "MBAFF support not included; enable it at compile-time.\n");
 396 #endif
 397     sps->crop= get_bits1(&s->gb);
 398     if(sps->crop){
 399         int crop_limit = sps->chroma_format_idc == 3 ? 16 : 8;
 400         sps->crop_left  = get_ue_golomb(&s->gb);
 401         sps->crop_right = get_ue_golomb(&s->gb);
 402         sps->crop_top   = get_ue_golomb(&s->gb);
 403         sps->crop_bottom= get_ue_golomb(&s->gb);
 404         if(sps->crop_left || sps->crop_top){
 405             av_log(h->s.avctx, AV_LOG_ERROR, "insane cropping not completely supported, this could look slightly wrong ...\n");
 406         }
 407         if(sps->crop_right >= crop_limit || sps->crop_bottom >= crop_limit){
 408             av_log(h->s.avctx, AV_LOG_ERROR, "brainfart cropping not supported, this could look slightly wrong ...\n");
 409         }
 410     }else{
 411         sps->crop_left  =
 412         sps->crop_right =
 413         sps->crop_top   =
 414         sps->crop_bottom= 0;
 415     }
 416
 417     sps->vui_parameters_present_flag= get_bits1(&s->gb);
 418     if( sps->vui_parameters_present_flag )
 419         if (decode_vui_parameters(h, sps) < 0)
 420             goto fail;
 421
 422     if(!sps->sar.den)
 423         sps->sar.den= 1;
 424
 425     if(s->avctx->debug&FF_DEBUG_PICT_INFO){
 426         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",
 427                sps_id, sps->profile_idc, sps->level_idc,
 428                sps->poc_type,
 429                sps->ref_frame_count,
 430                sps->mb_width, sps->mb_height,
 431                sps->frame_mbs_only_flag ? "FRM" : (sps->mb_aff ? "MB-AFF" : "PIC-AFF"),
 432                sps->direct_8x8_inference_flag ? "8B8" : "",
 433                sps->crop_left, sps->crop_right,
 434                sps->crop_top, sps->crop_bottom,
 435                sps->vui_parameters_present_flag ? "VUI" : "",
 436                ((const char*[]){"Gray","420","422","444"})[sps->chroma_format_idc],
 437                sps->timing_info_present_flag ? sps->num_units_in_tick : 0,
 438                sps->timing_info_present_flag ? sps->time_scale : 0
 439                );
 440     }
 441
 442     av_free(h->sps_buffers[sps_id]);
 443     h->sps_buffers[sps_id]= sps;
 444     h->sps = *sps;
 445     return 0;
 446 fail:
 447     av_free(sps);
 448     return -1;
 449 }
 450
 451 static void
 452 build_qp_table(PPS *pps, int t, int index, const int depth)
 453 {
 454     int i;
 455     const int max_qp = 51 + 6*(depth-8);
 456     for(i = 0; i < max_qp+1; i++)
 457         pps->chroma_qp_table[t][i] = ff_h264_chroma_qp[depth-8][av_clip(i + index, 0, max_qp)];
 458 }
 459
 460 int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length){
 461     MpegEncContext * const s = &h->s;
 462     unsigned int pps_id= get_ue_golomb(&s->gb);
 463     PPS *pps;
 464     const int qp_bd_offset = 6*(h->sps.bit_depth_luma-8);
 465
 466     if(pps_id >= MAX_PPS_COUNT) {
 467         av_log(h->s.avctx, AV_LOG_ERROR, "pps_id (%d) out of range\n", pps_id);
 468         return -1;
 469     }
 470
 471     pps= av_mallocz(sizeof(PPS));
 472     if(pps == NULL)
 473         return -1;
 474     pps->sps_id= get_ue_golomb_31(&s->gb);
 475     if((unsigned)pps->sps_id>=MAX_SPS_COUNT || h->sps_buffers[pps->sps_id] == NULL){
 476         av_log(h->s.avctx, AV_LOG_ERROR, "sps_id out of range\n");
 477         goto fail;
 478     }
 479
 480     pps->cabac= get_bits1(&s->gb);
 481     pps->pic_order_present= get_bits1(&s->gb);
 482     pps->slice_group_count= get_ue_golomb(&s->gb) + 1;
 483     if(pps->slice_group_count > 1 ){
 484         pps->mb_slice_group_map_type= get_ue_golomb(&s->gb);
 485         av_log(h->s.avctx, AV_LOG_ERROR, "FMO not supported\n");
 486         switch(pps->mb_slice_group_map_type){
 487         case 0:
 488 #if 0
 489 |   for( i = 0; i <= num_slice_groups_minus1; i++ ) |   |        |
 490 |    run_length[ i ]                                |1  |ue(v)   |
 491 #endif
 492             break;
 493         case 2:
 494 #if 0
 495 |   for( i = 0; i < num_slice_groups_minus1; i++ )  |   |        |
 496 |{                                                  |   |        |
 497 |    top_left_mb[ i ]                               |1  |ue(v)   |
 498 |    bottom_right_mb[ i ]                           |1  |ue(v)   |
 499 |   }                                               |   |        |
 500 #endif
 501             break;
 502         case 3:
 503         case 4:
 504         case 5:
 505 #if 0
 506 |   slice_group_change_direction_flag               |1  |u(1)    |
 507 |   slice_group_change_rate_minus1                  |1  |ue(v)   |
 508 #endif
 509             break;
 510         case 6:
 511 #if 0
 512 |   slice_group_id_cnt_minus1                       |1  |ue(v)   |
 513 |   for( i = 0; i <= slice_group_id_cnt_minus1; i++ |   |        |
 514 |)                                                  |   |        |
 515 |    slice_group_id[ i ]                            |1  |u(v)    |
 516 #endif
 517             break;
 518         }
 519     }
 520     pps->ref_count[0]= get_ue_golomb(&s->gb) + 1;
 521     pps->ref_count[1]= get_ue_golomb(&s->gb) + 1;
 522     if(pps->ref_count[0]-1 > 32-1 || pps->ref_count[1]-1 > 32-1){
 523         av_log(h->s.avctx, AV_LOG_ERROR, "reference overflow (pps)\n");
 524         goto fail;
 525     }
 526
 527     pps->weighted_pred= get_bits1(&s->gb);
 528     pps->weighted_bipred_idc= get_bits(&s->gb, 2);
 529     pps->init_qp= get_se_golomb(&s->gb) + 26 + qp_bd_offset;
 530     pps->init_qs= get_se_golomb(&s->gb) + 26 + qp_bd_offset;
 531     pps->chroma_qp_index_offset[0]= get_se_golomb(&s->gb);
 532     pps->deblocking_filter_parameters_present= get_bits1(&s->gb);
 533     pps->constrained_intra_pred= get_bits1(&s->gb);
 534     pps->redundant_pic_cnt_present = get_bits1(&s->gb);
 535
 536     pps->transform_8x8_mode= 0;
 537     h->dequant_coeff_pps= -1; //contents of sps/pps can change even if id doesn't, so reinit
 538     memcpy(pps->scaling_matrix4, h->sps_buffers[pps->sps_id]->scaling_matrix4, sizeof(pps->scaling_matrix4));
 539     memcpy(pps->scaling_matrix8, h->sps_buffers[pps->sps_id]->scaling_matrix8, sizeof(pps->scaling_matrix8));
 540
 541     if(get_bits_count(&s->gb) < bit_length){
 542         pps->transform_8x8_mode= get_bits1(&s->gb);
 543         decode_scaling_matrices(h, h->sps_buffers[pps->sps_id], pps, 0, pps->scaling_matrix4, pps->scaling_matrix8);
 544         pps->chroma_qp_index_offset[1]= get_se_golomb(&s->gb); //second_chroma_qp_index_offset
 545     } else {
 546         pps->chroma_qp_index_offset[1]= pps->chroma_qp_index_offset[0];
 547     }
 548
 549     build_qp_table(pps, 0, pps->chroma_qp_index_offset[0], h->sps.bit_depth_luma);
 550     build_qp_table(pps, 1, pps->chroma_qp_index_offset[1], h->sps.bit_depth_luma);
 551     if(pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])
 552         pps->chroma_qp_diff= 1;
 553
 554     if(s->avctx->debug&FF_DEBUG_PICT_INFO){
 555         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",
 556                pps_id, pps->sps_id,
 557                pps->cabac ? "CABAC" : "CAVLC",
 558                pps->slice_group_count,
 559                pps->ref_count[0], pps->ref_count[1],
 560                pps->weighted_pred ? "weighted" : "",
 561                pps->init_qp, pps->init_qs, pps->chroma_qp_index_offset[0], pps->chroma_qp_index_offset[1],
 562                pps->deblocking_filter_parameters_present ? "LPAR" : "",
 563                pps->constrained_intra_pred ? "CONSTR" : "",
 564                pps->redundant_pic_cnt_present ? "REDU" : "",
 565                pps->transform_8x8_mode ? "8x8DCT" : ""
 566                );
 567     }
 568
 569     av_free(h->pps_buffers[pps_id]);
 570     h->pps_buffers[pps_id]= pps;
 571     return 0;
 572 fail:
 573     av_free(pps);
 574     return -1;
 575 }