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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 "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[5][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         0,  1, 2, 3,  4,  5,
  88         6,  7, 8, 9, 10, 11,
  89         12,13,14,15, 16, 17,
  90         CHROMA_QP_TABLE_END(11)
  91     },
  92     {
  93         0,  1, 2, 3,  4,  5,
  94         6,  7, 8, 9, 10, 11,
  95         12,13,14,15, 16, 17,
  96         18,19,20,21, 22, 23,
  97         CHROMA_QP_TABLE_END(12)
  98     },
  99 };
 100
 101 static const uint8_t default_scaling4[2][16]={
 102 {   6,13,20,28,
 103    13,20,28,32,
 104    20,28,32,37,
 105    28,32,37,42
 106 },{
 107    10,14,20,24,
 108    14,20,24,27,
 109    20,24,27,30,
 110    24,27,30,34
 111 }};
 112
 113 static const uint8_t default_scaling8[2][64]={
 114 {   6,10,13,16,18,23,25,27,
 115    10,11,16,18,23,25,27,29,
 116    13,16,18,23,25,27,29,31,
 117    16,18,23,25,27,29,31,33,
 118    18,23,25,27,29,31,33,36,
 119    23,25,27,29,31,33,36,38,
 120    25,27,29,31,33,36,38,40,
 121    27,29,31,33,36,38,40,42
 122 },{
 123     9,13,15,17,19,21,22,24,
 124    13,13,17,19,21,22,24,25,
 125    15,17,19,21,22,24,25,27,
 126    17,19,21,22,24,25,27,28,
 127    19,21,22,24,25,27,28,30,
 128    21,22,24,25,27,28,30,32,
 129    22,24,25,27,28,30,32,33,
 130    24,25,27,28,30,32,33,35
 131 }};
 132
 133 static inline int decode_hrd_parameters(H264Context *h, SPS *sps){
 134     MpegEncContext * const s = &h->s;
 135     int cpb_count, i;
 136     cpb_count = get_ue_golomb_31(&s->gb) + 1;
 137
 138     if(cpb_count > 32U){
 139         av_log(h->s.avctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);
 140         return -1;
 141     }
 142
 143     get_bits(&s->gb, 4); /* bit_rate_scale */
 144     get_bits(&s->gb, 4); /* cpb_size_scale */
 145     for(i=0; i<cpb_count; i++){
 146         get_ue_golomb(&s->gb); /* bit_rate_value_minus1 */
 147         get_ue_golomb(&s->gb); /* cpb_size_value_minus1 */
 148         get_bits1(&s->gb);     /* cbr_flag */
 149     }
 150     sps->initial_cpb_removal_delay_length = get_bits(&s->gb, 5) + 1;
 151     sps->cpb_removal_delay_length = get_bits(&s->gb, 5) + 1;
 152     sps->dpb_output_delay_length = get_bits(&s->gb, 5) + 1;
 153     sps->time_offset_length = get_bits(&s->gb, 5);
 154     sps->cpb_cnt = cpb_count;
 155     return 0;
 156 }
 157
 158 static inline int decode_vui_parameters(H264Context *h, SPS *sps){
 159     MpegEncContext * const s = &h->s;
 160     int aspect_ratio_info_present_flag;
 161     unsigned int aspect_ratio_idc;
 162
 163     aspect_ratio_info_present_flag= get_bits1(&s->gb);
 164
 165     if( aspect_ratio_info_present_flag ) {
 166         aspect_ratio_idc= get_bits(&s->gb, 8);
 167         if( aspect_ratio_idc == EXTENDED_SAR ) {
 168             sps->sar.num= get_bits(&s->gb, 16);
 169             sps->sar.den= get_bits(&s->gb, 16);
 170         }else if(aspect_ratio_idc < FF_ARRAY_ELEMS(pixel_aspect)){
 171             sps->sar=  pixel_aspect[aspect_ratio_idc];
 172         }else{
 173             av_log(h->s.avctx, AV_LOG_ERROR, "illegal aspect ratio\n");
 174             return -1;
 175         }
 176     }else{
 177         sps->sar.num=
 178         sps->sar.den= 0;
 179     }
 180 //            s->avctx->aspect_ratio= sar_width*s->width / (float)(s->height*sar_height);
 181
 182     if(get_bits1(&s->gb)){      /* overscan_info_present_flag */
 183         get_bits1(&s->gb);      /* overscan_appropriate_flag */
 184     }
 185
 186     sps->video_signal_type_present_flag = get_bits1(&s->gb);
 187     if(sps->video_signal_type_present_flag){
 188         get_bits(&s->gb, 3);    /* video_format */
 189         sps->full_range = get_bits1(&s->gb); /* video_full_range_flag */
 190
 191         sps->colour_description_present_flag = get_bits1(&s->gb);
 192         if(sps->colour_description_present_flag){
 193             sps->color_primaries = get_bits(&s->gb, 8); /* colour_primaries */
 194             sps->color_trc       = get_bits(&s->gb, 8); /* transfer_characteristics */
 195             sps->colorspace      = get_bits(&s->gb, 8); /* matrix_coefficients */
 196             if (sps->color_primaries >= AVCOL_PRI_NB)
 197                 sps->color_primaries  = AVCOL_PRI_UNSPECIFIED;
 198             if (sps->color_trc >= AVCOL_TRC_NB)
 199                 sps->color_trc  = AVCOL_TRC_UNSPECIFIED;
 200             if (sps->colorspace >= AVCOL_SPC_NB)
 201                 sps->colorspace  = AVCOL_SPC_UNSPECIFIED;
 202         }
 203     }
 204
 205     if(get_bits1(&s->gb)){      /* chroma_location_info_present_flag */
 206         s->avctx->chroma_sample_location = get_ue_golomb(&s->gb)+1;  /* chroma_sample_location_type_top_field */
 207         get_ue_golomb(&s->gb);  /* chroma_sample_location_type_bottom_field */
 208     }
 209
 210     sps->timing_info_present_flag = get_bits1(&s->gb);
 211     if(sps->timing_info_present_flag){
 212         sps->num_units_in_tick = get_bits_long(&s->gb, 32);
 213         sps->time_scale = get_bits_long(&s->gb, 32);
 214         if(!sps->num_units_in_tick || !sps->time_scale){
 215             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);
 216             return -1;
 217         }
 218         sps->fixed_frame_rate_flag = get_bits1(&s->gb);
 219     }
 220
 221     sps->nal_hrd_parameters_present_flag = get_bits1(&s->gb);
 222     if(sps->nal_hrd_parameters_present_flag)
 223         if(decode_hrd_parameters(h, sps) < 0)
 224             return -1;
 225     sps->vcl_hrd_parameters_present_flag = get_bits1(&s->gb);
 226     if(sps->vcl_hrd_parameters_present_flag)
 227         if(decode_hrd_parameters(h, sps) < 0)
 228             return -1;
 229     if(sps->nal_hrd_parameters_present_flag || sps->vcl_hrd_parameters_present_flag)
 230         get_bits1(&s->gb);     /* low_delay_hrd_flag */
 231     sps->pic_struct_present_flag = get_bits1(&s->gb);
 232
 233     sps->bitstream_restriction_flag = get_bits1(&s->gb);
 234     if(sps->bitstream_restriction_flag){
 235         get_bits1(&s->gb);     /* motion_vectors_over_pic_boundaries_flag */
 236         get_ue_golomb(&s->gb); /* max_bytes_per_pic_denom */
 237         get_ue_golomb(&s->gb); /* max_bits_per_mb_denom */
 238         get_ue_golomb(&s->gb); /* log2_max_mv_length_horizontal */
 239         get_ue_golomb(&s->gb); /* log2_max_mv_length_vertical */
 240         sps->num_reorder_frames= get_ue_golomb(&s->gb);
 241         get_ue_golomb(&s->gb); /*max_dec_frame_buffering*/
 242
 243         if(s->gb.size_in_bits < get_bits_count(&s->gb)){
 244             sps->num_reorder_frames=0;
 245             sps->bitstream_restriction_flag= 0;
 246         }
 247
 248         if(sps->num_reorder_frames > 16U /*max_dec_frame_buffering || max_dec_frame_buffering > 16*/){
 249             av_log(h->s.avctx, AV_LOG_ERROR, "illegal num_reorder_frames %d\n", sps->num_reorder_frames);
 250             return -1;
 251         }
 252     }
 253     if(s->gb.size_in_bits < get_bits_count(&s->gb)){
 254         av_log(h->s.avctx, AV_LOG_ERROR, "Overread VUI by %d bits\n", get_bits_count(&s->gb) - s->gb.size_in_bits);
 255         return -1;
 256     }
 257
 258     return 0;
 259 }
 260
 261 static void decode_scaling_list(H264Context *h, uint8_t *factors, int size,
 262                                 const uint8_t *jvt_list, const uint8_t *fallback_list){
 263     MpegEncContext * const s = &h->s;
 264     int i, last = 8, next = 8;
 265     const uint8_t *scan = size == 16 ? zigzag_scan : ff_zigzag_direct;
 266     if(!get_bits1(&s->gb)) /* matrix not written, we use the predicted one */
 267         memcpy(factors, fallback_list, size*sizeof(uint8_t));
 268     else
 269     for(i=0;i<size;i++){
 270         if(next)
 271             next = (last + get_se_golomb(&s->gb)) & 0xff;
 272         if(!i && !next){ /* matrix not written, we use the preset one */
 273             memcpy(factors, jvt_list, size*sizeof(uint8_t));
 274             break;
 275         }
 276         last = factors[scan[i]] = next ? next : last;
 277     }
 278 }
 279
 280 static void decode_scaling_matrices(H264Context *h, SPS *sps, PPS *pps, int is_sps,
 281                                    uint8_t (*scaling_matrix4)[16], uint8_t (*scaling_matrix8)[64]){
 282     MpegEncContext * const s = &h->s;
 283     int fallback_sps = !is_sps && sps->scaling_matrix_present;
 284     const uint8_t *fallback[4] = {
 285         fallback_sps ? sps->scaling_matrix4[0] : default_scaling4[0],
 286         fallback_sps ? sps->scaling_matrix4[3] : default_scaling4[1],
 287         fallback_sps ? sps->scaling_matrix8[0] : default_scaling8[0],
 288         fallback_sps ? sps->scaling_matrix8[3] : default_scaling8[1]
 289     };
 290     if(get_bits1(&s->gb)){
 291         sps->scaling_matrix_present |= is_sps;
 292         decode_scaling_list(h,scaling_matrix4[0],16,default_scaling4[0],fallback[0]); // Intra, Y
 293         decode_scaling_list(h,scaling_matrix4[1],16,default_scaling4[0],scaling_matrix4[0]); // Intra, Cr
 294         decode_scaling_list(h,scaling_matrix4[2],16,default_scaling4[0],scaling_matrix4[1]); // Intra, Cb
 295         decode_scaling_list(h,scaling_matrix4[3],16,default_scaling4[1],fallback[1]); // Inter, Y
 296         decode_scaling_list(h,scaling_matrix4[4],16,default_scaling4[1],scaling_matrix4[3]); // Inter, Cr
 297         decode_scaling_list(h,scaling_matrix4[5],16,default_scaling4[1],scaling_matrix4[4]); // Inter, Cb
 298         if(is_sps || pps->transform_8x8_mode){
 299             decode_scaling_list(h,scaling_matrix8[0],64,default_scaling8[0],fallback[2]);  // Intra, Y
 300             if(sps->chroma_format_idc == 3){
 301                 decode_scaling_list(h,scaling_matrix8[1],64,default_scaling8[0],scaling_matrix8[0]);  // Intra, Cr
 302                 decode_scaling_list(h,scaling_matrix8[2],64,default_scaling8[0],scaling_matrix8[1]);  // Intra, Cb
 303             }
 304             decode_scaling_list(h,scaling_matrix8[3],64,default_scaling8[1],fallback[3]);  // Inter, Y
 305             if(sps->chroma_format_idc == 3){
 306                 decode_scaling_list(h,scaling_matrix8[4],64,default_scaling8[1],scaling_matrix8[3]);  // Inter, Cr
 307                 decode_scaling_list(h,scaling_matrix8[5],64,default_scaling8[1],scaling_matrix8[4]);  // Inter, Cb
 308             }
 309         }
 310     }
 311 }
 312
 313 int ff_h264_decode_seq_parameter_set(H264Context *h){
 314     MpegEncContext * const s = &h->s;
 315     int profile_idc, level_idc, constraint_set_flags = 0;
 316     unsigned int sps_id;
 317     int i;
 318     SPS *sps;
 319
 320     profile_idc= get_bits(&s->gb, 8);
 321     constraint_set_flags |= get_bits1(&s->gb) << 0;   //constraint_set0_flag
 322     constraint_set_flags |= get_bits1(&s->gb) << 1;   //constraint_set1_flag
 323     constraint_set_flags |= get_bits1(&s->gb) << 2;   //constraint_set2_flag
 324     constraint_set_flags |= get_bits1(&s->gb) << 3;   //constraint_set3_flag
 325     get_bits(&s->gb, 4); // reserved
 326     level_idc= get_bits(&s->gb, 8);
 327     sps_id= get_ue_golomb_31(&s->gb);
 328
 329     if(sps_id >= MAX_SPS_COUNT) {
 330         av_log(h->s.avctx, AV_LOG_ERROR, "sps_id (%d) out of range\n", sps_id);
 331         return -1;
 332     }
 333     sps= av_mallocz(sizeof(SPS));
 334     if(sps == NULL)
 335         return -1;
 336
 337     sps->time_offset_length = 24;
 338     sps->profile_idc= profile_idc;
 339     sps->constraint_set_flags = constraint_set_flags;
 340     sps->level_idc= level_idc;
 341
 342     memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));
 343     memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));
 344     sps->scaling_matrix_present = 0;
 345
 346     if(sps->profile_idc >= 100){ //high profile
 347         sps->chroma_format_idc= get_ue_golomb_31(&s->gb);
 348         if(sps->chroma_format_idc == 3)
 349             sps->residual_color_transform_flag = get_bits1(&s->gb);
 350         sps->bit_depth_luma   = get_ue_golomb(&s->gb) + 8;
 351         sps->bit_depth_chroma = get_ue_golomb(&s->gb) + 8;
 352         if (sps->bit_depth_luma > 12U || sps->bit_depth_chroma > 12U) {
 353             av_log(h->s.avctx, AV_LOG_ERROR, "illegal bit depth value (%d, %d)\n",
 354                    sps->bit_depth_luma, sps->bit_depth_chroma);
 355             goto fail;
 356         }
 357         sps->transform_bypass = get_bits1(&s->gb);
 358         decode_scaling_matrices(h, sps, NULL, 1, sps->scaling_matrix4, sps->scaling_matrix8);
 359     }else{
 360         sps->chroma_format_idc= 1;
 361         sps->bit_depth_luma   = 8;
 362         sps->bit_depth_chroma = 8;
 363     }
 364
 365     sps->log2_max_frame_num= get_ue_golomb(&s->gb) + 4;
 366     sps->poc_type= get_ue_golomb_31(&s->gb);
 367
 368     if(sps->poc_type == 0){ //FIXME #define
 369         sps->log2_max_poc_lsb= get_ue_golomb(&s->gb) + 4;
 370     } else if(sps->poc_type == 1){//FIXME #define
 371         sps->delta_pic_order_always_zero_flag= get_bits1(&s->gb);
 372         sps->offset_for_non_ref_pic= get_se_golomb(&s->gb);
 373         sps->offset_for_top_to_bottom_field= get_se_golomb(&s->gb);
 374         sps->poc_cycle_length                = get_ue_golomb(&s->gb);
 375
 376         if((unsigned)sps->poc_cycle_length >= FF_ARRAY_ELEMS(sps->offset_for_ref_frame)){
 377             av_log(h->s.avctx, AV_LOG_ERROR, "poc_cycle_length overflow %u\n", sps->poc_cycle_length);
 378             goto fail;
 379         }
 380
 381         for(i=0; i<sps->poc_cycle_length; i++)
 382             sps->offset_for_ref_frame[i]= get_se_golomb(&s->gb);
 383     }else if(sps->poc_type != 2){
 384         av_log(h->s.avctx, AV_LOG_ERROR, "illegal POC type %d\n", sps->poc_type);
 385         goto fail;
 386     }
 387
 388     sps->ref_frame_count= get_ue_golomb_31(&s->gb);
 389     if(sps->ref_frame_count > MAX_PICTURE_COUNT-2 || sps->ref_frame_count > 16U){
 390         av_log(h->s.avctx, AV_LOG_ERROR, "too many reference frames\n");
 391         goto fail;
 392     }
 393     sps->gaps_in_frame_num_allowed_flag= get_bits1(&s->gb);
 394     sps->mb_width = get_ue_golomb(&s->gb) + 1;
 395     sps->mb_height= get_ue_golomb(&s->gb) + 1;
 396     if((unsigned)sps->mb_width >= INT_MAX/16 || (unsigned)sps->mb_height >= INT_MAX/16 ||
 397        av_image_check_size(16*sps->mb_width, 16*sps->mb_height, 0, h->s.avctx)){
 398         av_log(h->s.avctx, AV_LOG_ERROR, "mb_width/height overflow\n");
 399         goto fail;
 400     }
 401
 402     sps->frame_mbs_only_flag= get_bits1(&s->gb);
 403     if(!sps->frame_mbs_only_flag)
 404         sps->mb_aff= get_bits1(&s->gb);
 405     else
 406         sps->mb_aff= 0;
 407
 408     sps->direct_8x8_inference_flag= get_bits1(&s->gb);
 409     if(!sps->frame_mbs_only_flag && !sps->direct_8x8_inference_flag){
 410         av_log(h->s.avctx, AV_LOG_ERROR, "This stream was generated by a broken encoder, invalid 8x8 inference\n");
 411         goto fail;
 412     }
 413
 414 #ifndef ALLOW_INTERLACE
 415     if(sps->mb_aff)
 416         av_log(h->s.avctx, AV_LOG_ERROR, "MBAFF support not included; enable it at compile-time.\n");
 417 #endif
 418     sps->crop= get_bits1(&s->gb);
 419     if(sps->crop){
 420         int crop_vertical_limit = sps->chroma_format_idc & 2 ? 16 : 8;
 421         int crop_horizontal_limit = sps->chroma_format_idc == 3 ? 16 : 8;
 422         sps->crop_left  = get_ue_golomb(&s->gb);
 423         sps->crop_right = get_ue_golomb(&s->gb);
 424         sps->crop_top   = get_ue_golomb(&s->gb);
 425         sps->crop_bottom= get_ue_golomb(&s->gb);
 426         if(sps->crop_left || sps->crop_top){
 427             av_log(h->s.avctx, AV_LOG_ERROR, "insane cropping not completely supported, this could look slightly wrong ... (left: %d, top: %d)\n", sps->crop_left, sps->crop_top);
 428         }
 429         if(sps->crop_right >= crop_horizontal_limit || sps->crop_bottom >= crop_vertical_limit){
 430             av_log(h->s.avctx, AV_LOG_ERROR, "brainfart cropping not supported, cropping disabled (right: %d, bottom: %d)\n", sps->crop_right, sps->crop_bottom);
 431         /* It is very unlikely that partial cropping will make anybody happy.
 432          * Not cropping at all fixes for example playback of Sisvel 3D streams
 433          * in applications supporting Sisvel 3D. */
 434         sps->crop_left  =
 435         sps->crop_right =
 436         sps->crop_top   =
 437         sps->crop_bottom= 0;
 438         }
 439     }else{
 440         sps->crop_left  =
 441         sps->crop_right =
 442         sps->crop_top   =
 443         sps->crop_bottom= 0;
 444     }
 445
 446     sps->vui_parameters_present_flag= get_bits1(&s->gb);
 447     if( sps->vui_parameters_present_flag )
 448         if (decode_vui_parameters(h, sps) < 0)
 449             goto fail;
 450
 451     if(!sps->sar.den)
 452         sps->sar.den= 1;
 453
 454     if(s->avctx->debug&FF_DEBUG_PICT_INFO){
 455         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 b%d\n",
 456                sps_id, sps->profile_idc, sps->level_idc,
 457                sps->poc_type,
 458                sps->ref_frame_count,
 459                sps->mb_width, sps->mb_height,
 460                sps->frame_mbs_only_flag ? "FRM" : (sps->mb_aff ? "MB-AFF" : "PIC-AFF"),
 461                sps->direct_8x8_inference_flag ? "8B8" : "",
 462                sps->crop_left, sps->crop_right,
 463                sps->crop_top, sps->crop_bottom,
 464                sps->vui_parameters_present_flag ? "VUI" : "",
 465                ((const char*[]){"Gray","420","422","444"})[sps->chroma_format_idc],
 466                sps->timing_info_present_flag ? sps->num_units_in_tick : 0,
 467                sps->timing_info_present_flag ? sps->time_scale : 0,
 468                sps->bit_depth_luma
 469                );
 470     }
 471
 472     av_free(h->sps_buffers[sps_id]);
 473     h->sps_buffers[sps_id]= sps;
 474     h->sps = *sps;
 475     return 0;
 476 fail:
 477     av_free(sps);
 478     return -1;
 479 }
 480
 481 static void
 482 build_qp_table(PPS *pps, int t, int index, const int depth)
 483 {
 484     int i;
 485     const int max_qp = 51 + 6*(depth-8);
 486     for(i = 0; i < max_qp+1; i++)
 487         pps->chroma_qp_table[t][i] = ff_h264_chroma_qp[depth-8][av_clip(i + index, 0, max_qp)];
 488 }
 489
 490 int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length){
 491     MpegEncContext * const s = &h->s;
 492     unsigned int pps_id= get_ue_golomb(&s->gb);
 493     PPS *pps;
 494     const int qp_bd_offset = 6*(h->sps.bit_depth_luma-8);
 495
 496     if(pps_id >= MAX_PPS_COUNT) {
 497         av_log(h->s.avctx, AV_LOG_ERROR, "pps_id (%d) out of range\n", pps_id);
 498         return -1;
 499     }
 500
 501     pps= av_mallocz(sizeof(PPS));
 502     if(pps == NULL)
 503         return -1;
 504     pps->sps_id= get_ue_golomb_31(&s->gb);
 505     if((unsigned)pps->sps_id>=MAX_SPS_COUNT || h->sps_buffers[pps->sps_id] == NULL){
 506         av_log(h->s.avctx, AV_LOG_ERROR, "sps_id out of range\n");
 507         goto fail;
 508     }
 509
 510     pps->cabac= get_bits1(&s->gb);
 511     pps->pic_order_present= get_bits1(&s->gb);
 512     pps->slice_group_count= get_ue_golomb(&s->gb) + 1;
 513     if(pps->slice_group_count > 1 ){
 514         pps->mb_slice_group_map_type= get_ue_golomb(&s->gb);
 515         av_log(h->s.avctx, AV_LOG_ERROR, "FMO not supported\n");
 516         switch(pps->mb_slice_group_map_type){
 517         case 0:
 518 #if 0
 519 |   for( i = 0; i <= num_slice_groups_minus1; i++ ) |   |        |
 520 |    run_length[ i ]                                |1  |ue(v)   |
 521 #endif
 522             break;
 523         case 2:
 524 #if 0
 525 |   for( i = 0; i < num_slice_groups_minus1; i++ )  |   |        |
 526 |{                                                  |   |        |
 527 |    top_left_mb[ i ]                               |1  |ue(v)   |
 528 |    bottom_right_mb[ i ]                           |1  |ue(v)   |
 529 |   }                                               |   |        |
 530 #endif
 531             break;
 532         case 3:
 533         case 4:
 534         case 5:
 535 #if 0
 536 |   slice_group_change_direction_flag               |1  |u(1)    |
 537 |   slice_group_change_rate_minus1                  |1  |ue(v)   |
 538 #endif
 539             break;
 540         case 6:
 541 #if 0
 542 |   slice_group_id_cnt_minus1                       |1  |ue(v)   |
 543 |   for( i = 0; i <= slice_group_id_cnt_minus1; i++ |   |        |
 544 |)                                                  |   |        |
 545 |    slice_group_id[ i ]                            |1  |u(v)    |
 546 #endif
 547             break;
 548         }
 549     }
 550     pps->ref_count[0]= get_ue_golomb(&s->gb) + 1;
 551     pps->ref_count[1]= get_ue_golomb(&s->gb) + 1;
 552     if(pps->ref_count[0]-1 > 32-1 || pps->ref_count[1]-1 > 32-1){
 553         av_log(h->s.avctx, AV_LOG_ERROR, "reference overflow (pps)\n");
 554         goto fail;
 555     }
 556
 557     pps->weighted_pred= get_bits1(&s->gb);
 558     pps->weighted_bipred_idc= get_bits(&s->gb, 2);
 559     pps->init_qp= get_se_golomb(&s->gb) + 26 + qp_bd_offset;
 560     pps->init_qs= get_se_golomb(&s->gb) + 26 + qp_bd_offset;
 561     pps->chroma_qp_index_offset[0]= get_se_golomb(&s->gb);
 562     pps->deblocking_filter_parameters_present= get_bits1(&s->gb);
 563     pps->constrained_intra_pred= get_bits1(&s->gb);
 564     pps->redundant_pic_cnt_present = get_bits1(&s->gb);
 565
 566     pps->transform_8x8_mode= 0;
 567     h->dequant_coeff_pps= -1; //contents of sps/pps can change even if id doesn't, so reinit
 568     memcpy(pps->scaling_matrix4, h->sps_buffers[pps->sps_id]->scaling_matrix4, sizeof(pps->scaling_matrix4));
 569     memcpy(pps->scaling_matrix8, h->sps_buffers[pps->sps_id]->scaling_matrix8, sizeof(pps->scaling_matrix8));
 570
 571     if(get_bits_count(&s->gb) < bit_length){
 572         pps->transform_8x8_mode= get_bits1(&s->gb);
 573         decode_scaling_matrices(h, h->sps_buffers[pps->sps_id], pps, 0, pps->scaling_matrix4, pps->scaling_matrix8);
 574         pps->chroma_qp_index_offset[1]= get_se_golomb(&s->gb); //second_chroma_qp_index_offset
 575     } else {
 576         pps->chroma_qp_index_offset[1]= pps->chroma_qp_index_offset[0];
 577     }
 578
 579     build_qp_table(pps, 0, pps->chroma_qp_index_offset[0], h->sps.bit_depth_luma);
 580     build_qp_table(pps, 1, pps->chroma_qp_index_offset[1], h->sps.bit_depth_luma);
 581     if(pps->chroma_qp_index_offset[0] != pps->chroma_qp_index_offset[1])
 582         pps->chroma_qp_diff= 1;
 583
 584     if(s->avctx->debug&FF_DEBUG_PICT_INFO){
 585         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",
 586                pps_id, pps->sps_id,
 587                pps->cabac ? "CABAC" : "CAVLC",
 588                pps->slice_group_count,
 589                pps->ref_count[0], pps->ref_count[1],
 590                pps->weighted_pred ? "weighted" : "",
 591                pps->init_qp, pps->init_qs, pps->chroma_qp_index_offset[0], pps->chroma_qp_index_offset[1],
 592                pps->deblocking_filter_parameters_present ? "LPAR" : "",
 593                pps->constrained_intra_pred ? "CONSTR" : "",
 594                pps->redundant_pic_cnt_present ? "REDU" : "",
 595                pps->transform_8x8_mode ? "8x8DCT" : ""
 596                );
 597     }
 598
 599     av_free(h->pps_buffers[pps_id]);
 600     h->pps_buffers[pps_id]= pps;
 601     return 0;
 602 fail:
 603     av_free(pps);
 604     return -1;
 605 }