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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 #define MAX_LOG2_MAX_FRAME_NUM    (12 + 4)
  41 #define MIN_LOG2_MAX_FRAME_NUM    4
  42
  43 static const AVRational pixel_aspect[17]={
  44  {0, 1},
  45  {1, 1},
  46  {12, 11},
  47  {10, 11},
  48  {16, 11},
  49  {40, 33},
  50  {24, 11},
  51  {20, 11},
  52  {32, 11},
  53  {80, 33},
  54  {18, 11},
  55  {15, 11},
  56  {64, 33},
  57  {160,99},
  58  {4, 3},
  59  {3, 2},
  60  {2, 1},
  61 };
  62
  63 #define QP(qP,depth) ( (qP)+6*((depth)-8) )
  64
  65 #define CHROMA_QP_TABLE_END(d) \
  66      QP(0,d),  QP(1,d),  QP(2,d),  QP(3,d),  QP(4,d),  QP(5,d),\
  67      QP(6,d),  QP(7,d),  QP(8,d),  QP(9,d), QP(10,d), QP(11,d),\
  68     QP(12,d), QP(13,d), QP(14,d), QP(15,d), QP(16,d), QP(17,d),\
  69     QP(18,d), QP(19,d), QP(20,d), QP(21,d), QP(22,d), QP(23,d),\
  70     QP(24,d), QP(25,d), QP(26,d), QP(27,d), QP(28,d), QP(29,d),\
  71     QP(29,d), QP(30,d), QP(31,d), QP(32,d), QP(32,d), QP(33,d),\
  72     QP(34,d), QP(34,d), QP(35,d), QP(35,d), QP(36,d), QP(36,d),\
  73     QP(37,d), QP(37,d), QP(37,d), QP(38,d), QP(38,d), QP(38,d),\
  74     QP(39,d), QP(39,d), QP(39,d), QP(39,d)
  75
  76 const uint8_t ff_h264_chroma_qp[3][QP_MAX_NUM+1] = {
  77     {
  78         CHROMA_QP_TABLE_END(8)
  79     },
  80     {
  81         0, 1, 2, 3, 4, 5,
  82         CHROMA_QP_TABLE_END(9)
  83     },
  84     {
  85         0, 1, 2, 3,  4,  5,
  86         6, 7, 8, 9, 10, 11,
  87         CHROMA_QP_TABLE_END(10)
  88     },
  89 };
  90
  91 static const uint8_t default_scaling4[2][16]={
  92 {   6,13,20,28,
  93    13,20,28,32,
  94    20,28,32,37,
  95    28,32,37,42
  96 },{
  97    10,14,20,24,
  98    14,20,24,27,
  99    20,24,27,30,
 100    24,27,30,34
 101 }};
 102
 103 static const uint8_t default_scaling8[2][64]={
 104 {   6,10,13,16,18,23,25,27,
 105    10,11,16,18,23,25,27,29,
 106    13,16,18,23,25,27,29,31,
 107    16,18,23,25,27,29,31,33,
 108    18,23,25,27,29,31,33,36,
 109    23,25,27,29,31,33,36,38,
 110    25,27,29,31,33,36,38,40,
 111    27,29,31,33,36,38,40,42
 112 },{
 113     9,13,15,17,19,21,22,24,
 114    13,13,17,19,21,22,24,25,
 115    15,17,19,21,22,24,25,27,
 116    17,19,21,22,24,25,27,28,
 117    19,21,22,24,25,27,28,30,
 118    21,22,24,25,27,28,30,32,
 119    22,24,25,27,28,30,32,33,
 120    24,25,27,28,30,32,33,35
 121 }};
 122
 123 static inline int decode_hrd_parameters(H264Context *h, SPS *sps){
 124     MpegEncContext * const s = &h->s;
 125     int cpb_count, i;
 126     cpb_count = get_ue_golomb_31(&s->gb) + 1;
 127
 128     if(cpb_count > 32U){
 129         av_log(h->s.avctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);
 130         return -1;
 131     }
 132
 133     get_bits(&s->gb, 4); /* bit_rate_scale */
 134     get_bits(&s->gb, 4); /* cpb_size_scale */
 135     for(i=0; i<cpb_count; i++){
 136         get_ue_golomb_long(&s->gb); /* bit_rate_value_minus1 */
 137         get_ue_golomb_long(&s->gb); /* cpb_size_value_minus1 */
 138         get_bits1(&s->gb);     /* cbr_flag */
 139     }
 140     sps->initial_cpb_removal_delay_length = get_bits(&s->gb, 5) + 1;
 141     sps->cpb_removal_delay_length = get_bits(&s->gb, 5) + 1;
 142     sps->dpb_output_delay_length = get_bits(&s->gb, 5) + 1;
 143     sps->time_offset_length = get_bits(&s->gb, 5);
 144     sps->cpb_cnt = cpb_count;
 145     return 0;
 146 }
 147
 148 static inline int decode_vui_parameters(H264Context *h, SPS *sps){
 149     MpegEncContext * const s = &h->s;
 150     int aspect_ratio_info_present_flag;
 151     unsigned int aspect_ratio_idc;
 152
 153     aspect_ratio_info_present_flag= get_bits1(&s->gb);
 154
 155     if( aspect_ratio_info_present_flag ) {
 156         aspect_ratio_idc= get_bits(&s->gb, 8);
 157         if( aspect_ratio_idc == EXTENDED_SAR ) {
 158             sps->sar.num= get_bits(&s->gb, 16);
 159             sps->sar.den= get_bits(&s->gb, 16);
 160         }else if(aspect_ratio_idc < FF_ARRAY_ELEMS(pixel_aspect)){
 161             sps->sar=  pixel_aspect[aspect_ratio_idc];
 162         }else{
 163             av_log(h->s.avctx, AV_LOG_ERROR, "illegal aspect ratio\n");
 164             return -1;
 165         }
 166     }else{
 167         sps->sar.num=
 168         sps->sar.den= 0;
 169     }
 170 //            s->avctx->aspect_ratio= sar_width*s->width / (float)(s->height*sar_height);
 171
 172     if(get_bits1(&s->gb)){      /* overscan_info_present_flag */
 173         get_bits1(&s->gb);      /* overscan_appropriate_flag */
 174     }
 175
 176     sps->video_signal_type_present_flag = get_bits1(&s->gb);
 177     if(sps->video_signal_type_present_flag){
 178         get_bits(&s->gb, 3);    /* video_format */
 179         sps->full_range = get_bits1(&s->gb); /* video_full_range_flag */
 180
 181         sps->colour_description_present_flag = get_bits1(&s->gb);
 182         if(sps->colour_description_present_flag){
 183             sps->color_primaries = get_bits(&s->gb, 8); /* colour_primaries */
 184             sps->color_trc       = get_bits(&s->gb, 8); /* transfer_characteristics */
 185             sps->colorspace      = get_bits(&s->gb, 8); /* matrix_coefficients */
 186             if (sps->color_primaries >= AVCOL_PRI_NB)
 187                 sps->color_primaries  = AVCOL_PRI_UNSPECIFIED;
 188             if (sps->color_trc >= AVCOL_TRC_NB)
 189                 sps->color_trc  = AVCOL_TRC_UNSPECIFIED;
 190             if (sps->colorspace >= AVCOL_SPC_NB)
 191                 sps->colorspace  = AVCOL_SPC_UNSPECIFIED;
 192         }
 193     }
 194
 195     if(get_bits1(&s->gb)){      /* chroma_location_info_present_flag */
 196         s->avctx->chroma_sample_location = get_ue_golomb(&s->gb)+1;  /* chroma_sample_location_type_top_field */
 197         get_ue_golomb(&s->gb);  /* chroma_sample_location_type_bottom_field */
 198     }
 199
 200     sps->timing_info_present_flag = get_bits1(&s->gb);
 201     if(sps->timing_info_present_flag){
 202         sps->num_units_in_tick = get_bits_long(&s->gb, 32);
 203         sps->time_scale = get_bits_long(&s->gb, 32);
 204         if(!sps->num_units_in_tick || !sps->time_scale){
 205             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);
 206             return -1;
 207         }
 208         sps->fixed_frame_rate_flag = get_bits1(&s->gb);
 209     }
 210
 211     sps->nal_hrd_parameters_present_flag = get_bits1(&s->gb);
 212     if(sps->nal_hrd_parameters_present_flag)
 213         if(decode_hrd_parameters(h, sps) < 0)
 214             return -1;
 215     sps->vcl_hrd_parameters_present_flag = get_bits1(&s->gb);
 216     if(sps->vcl_hrd_parameters_present_flag)
 217         if(decode_hrd_parameters(h, sps) < 0)
 218             return -1;
 219     if(sps->nal_hrd_parameters_present_flag || sps->vcl_hrd_parameters_present_flag)
 220         get_bits1(&s->gb);     /* low_delay_hrd_flag */
 221     sps->pic_struct_present_flag = get_bits1(&s->gb);
 222
 223     sps->bitstream_restriction_flag = get_bits1(&s->gb);
 224     if(sps->bitstream_restriction_flag){
 225         get_bits1(&s->gb);     /* motion_vectors_over_pic_boundaries_flag */
 226         get_ue_golomb(&s->gb); /* max_bytes_per_pic_denom */
 227         get_ue_golomb(&s->gb); /* max_bits_per_mb_denom */
 228         get_ue_golomb(&s->gb); /* log2_max_mv_length_horizontal */
 229         get_ue_golomb(&s->gb); /* log2_max_mv_length_vertical */
 230         sps->num_reorder_frames= get_ue_golomb(&s->gb);
 231         get_ue_golomb(&s->gb); /*max_dec_frame_buffering*/
 232
 233         if (get_bits_left(&s->gb) < 0) {
 234             sps->num_reorder_frames=0;
 235             sps->bitstream_restriction_flag= 0;
 236         }
 237
 238         if(sps->num_reorder_frames > 16U /*max_dec_frame_buffering || max_dec_frame_buffering > 16*/){
 239             av_log(h->s.avctx, AV_LOG_ERROR, "illegal num_reorder_frames %d\n", sps->num_reorder_frames);
 240             return -1;
 241         }
 242     }
 243     if (get_bits_left(&s->gb) < 0) {
 244         av_log(h->s.avctx, AV_LOG_ERROR, "Overread VUI by %d bits\n", -get_bits_left(&s->gb));
 245         return AVERROR_INVALIDDATA;
 246     }
 247
 248     return 0;
 249 }
 250
 251 static void decode_scaling_list(H264Context *h, uint8_t *factors, int size,
 252                                 const uint8_t *jvt_list, const uint8_t *fallback_list){
 253     MpegEncContext * const s = &h->s;
 254     int i, last = 8, next = 8;
 255     const uint8_t *scan = size == 16 ? zigzag_scan : ff_zigzag_direct;
 256     if(!get_bits1(&s->gb)) /* matrix not written, we use the predicted one */
 257         memcpy(factors, fallback_list, size*sizeof(uint8_t));
 258     else
 259     for(i=0;i<size;i++){
 260         if(next)
 261             next = (last + get_se_golomb(&s->gb)) & 0xff;
 262         if(!i && !next){ /* matrix not written, we use the preset one */
 263             memcpy(factors, jvt_list, size*sizeof(uint8_t));
 264             break;
 265         }
 266         last = factors[scan[i]] = next ? next : last;
 267     }
 268 }
 269
 270 static void decode_scaling_matrices(H264Context *h, SPS *sps, PPS *pps, int is_sps,
 271                                    uint8_t (*scaling_matrix4)[16], uint8_t (*scaling_matrix8)[64]){
 272     MpegEncContext * const s = &h->s;
 273     int fallback_sps = !is_sps && sps->scaling_matrix_present;
 274     const uint8_t *fallback[4] = {
 275         fallback_sps ? sps->scaling_matrix4[0] : default_scaling4[0],
 276         fallback_sps ? sps->scaling_matrix4[3] : default_scaling4[1],
 277         fallback_sps ? sps->scaling_matrix8[0] : default_scaling8[0],
 278         fallback_sps ? sps->scaling_matrix8[3] : default_scaling8[1]
 279     };
 280     if(get_bits1(&s->gb)){
 281         sps->scaling_matrix_present |= is_sps;
 282         decode_scaling_list(h,scaling_matrix4[0],16,default_scaling4[0],fallback[0]); // Intra, Y
 283         decode_scaling_list(h,scaling_matrix4[1],16,default_scaling4[0],scaling_matrix4[0]); // Intra, Cr
 284         decode_scaling_list(h,scaling_matrix4[2],16,default_scaling4[0],scaling_matrix4[1]); // Intra, Cb
 285         decode_scaling_list(h,scaling_matrix4[3],16,default_scaling4[1],fallback[1]); // Inter, Y
 286         decode_scaling_list(h,scaling_matrix4[4],16,default_scaling4[1],scaling_matrix4[3]); // Inter, Cr
 287         decode_scaling_list(h,scaling_matrix4[5],16,default_scaling4[1],scaling_matrix4[4]); // Inter, Cb
 288         if(is_sps || pps->transform_8x8_mode){
 289             decode_scaling_list(h,scaling_matrix8[0],64,default_scaling8[0],fallback[2]);  // Intra, Y
 290             if(sps->chroma_format_idc == 3){
 291                 decode_scaling_list(h,scaling_matrix8[1],64,default_scaling8[0],scaling_matrix8[0]);  // Intra, Cr
 292                 decode_scaling_list(h,scaling_matrix8[2],64,default_scaling8[0],scaling_matrix8[1]);  // Intra, Cb
 293             }
 294             decode_scaling_list(h,scaling_matrix8[3],64,default_scaling8[1],fallback[3]);  // Inter, Y
 295             if(sps->chroma_format_idc == 3){
 296                 decode_scaling_list(h,scaling_matrix8[4],64,default_scaling8[1],scaling_matrix8[3]);  // Inter, Cr
 297                 decode_scaling_list(h,scaling_matrix8[5],64,default_scaling8[1],scaling_matrix8[4]);  // Inter, Cb
 298             }
 299         }
 300     }
 301 }
 302
 303 int ff_h264_decode_seq_parameter_set(H264Context *h){
 304     MpegEncContext * const s = &h->s;
 305     int profile_idc, level_idc, constraint_set_flags = 0;
 306     unsigned int sps_id;
 307     int i, log2_max_frame_num_minus4;
 308     SPS *sps;
 309
 310     profile_idc= get_bits(&s->gb, 8);
 311     constraint_set_flags |= get_bits1(&s->gb) << 0;   //constraint_set0_flag
 312     constraint_set_flags |= get_bits1(&s->gb) << 1;   //constraint_set1_flag
 313     constraint_set_flags |= get_bits1(&s->gb) << 2;   //constraint_set2_flag
 314     constraint_set_flags |= get_bits1(&s->gb) << 3;   //constraint_set3_flag
 315     get_bits(&s->gb, 4); // reserved
 316     level_idc= get_bits(&s->gb, 8);
 317     sps_id= get_ue_golomb_31(&s->gb);
 318
 319     if(sps_id >= MAX_SPS_COUNT) {
 320         av_log(h->s.avctx, AV_LOG_ERROR, "sps_id (%d) out of range\n", sps_id);
 321         return -1;
 322     }
 323     sps= av_mallocz(sizeof(SPS));
 324     if(sps == NULL)
 325         return -1;
 326
 327     sps->time_offset_length = 24;
 328     sps->profile_idc= profile_idc;
 329     sps->constraint_set_flags = constraint_set_flags;
 330     sps->level_idc= level_idc;
 331
 332     memset(sps->scaling_matrix4, 16, sizeof(sps->scaling_matrix4));
 333     memset(sps->scaling_matrix8, 16, sizeof(sps->scaling_matrix8));
 334     sps->scaling_matrix_present = 0;
 335
 336     if(sps->profile_idc >= 100){ //high profile
 337         sps->chroma_format_idc= get_ue_golomb_31(&s->gb);
 338         if(sps->chroma_format_idc > 3) {
 339             av_log(h->s.avctx, AV_LOG_ERROR, "chroma_format_idc (%u) out of range\n", sps->chroma_format_idc);
 340             goto fail;
 341         } else if(sps->chroma_format_idc == 3) {
 342             sps->residual_color_transform_flag = get_bits1(&s->gb);
 343         }
 344         sps->bit_depth_luma   = get_ue_golomb(&s->gb) + 8;
 345         sps->bit_depth_chroma = get_ue_golomb(&s->gb) + 8;
 346         sps->transform_bypass = get_bits1(&s->gb);
 347         decode_scaling_matrices(h, sps, NULL, 1, sps->scaling_matrix4, sps->scaling_matrix8);
 348     }else{
 349         sps->chroma_format_idc= 1;
 350         sps->bit_depth_luma   = 8;
 351         sps->bit_depth_chroma = 8;
 352     }
 353
 354     log2_max_frame_num_minus4 = get_ue_golomb(&s->gb);
 355     if (log2_max_frame_num_minus4 < MIN_LOG2_MAX_FRAME_NUM - 4 ||
 356         log2_max_frame_num_minus4 > MAX_LOG2_MAX_FRAME_NUM - 4) {
 357         av_log(h->s.avctx, AV_LOG_ERROR,
 358                "log2_max_frame_num_minus4 out of range (0-12): %d\n",
 359                log2_max_frame_num_minus4);
 360         goto fail;
 361     }
 362     sps->log2_max_frame_num = log2_max_frame_num_minus4 + 4;
 363
 364     sps->poc_type= get_ue_golomb_31(&s->gb);
 365
 366     if(sps->poc_type == 0){ //FIXME #define
 367         sps->log2_max_poc_lsb= get_ue_golomb(&s->gb) + 4;
 368     } else if(sps->poc_type == 1){//FIXME #define
 369         sps->delta_pic_order_always_zero_flag= get_bits1(&s->gb);
 370         sps->offset_for_non_ref_pic= get_se_golomb(&s->gb);
 371         sps->offset_for_top_to_bottom_field= get_se_golomb(&s->gb);
 372         sps->poc_cycle_length                = get_ue_golomb(&s->gb);
 373
 374         if((unsigned)sps->poc_cycle_length >= FF_ARRAY_ELEMS(sps->offset_for_ref_frame)){
 375             av_log(h->s.avctx, AV_LOG_ERROR, "poc_cycle_length overflow %u\n", sps->poc_cycle_length);
 376             goto fail;
 377         }
 378
 379         for(i=0; i<sps->poc_cycle_length; i++)
 380             sps->offset_for_ref_frame[i]= get_se_golomb(&s->gb);
 381     }else if(sps->poc_type != 2){
 382         av_log(h->s.avctx, AV_LOG_ERROR, "illegal POC type %d\n", sps->poc_type);
 383         goto fail;
 384     }
 385
 386     sps->ref_frame_count= get_ue_golomb_31(&s->gb);
 387     if(sps->ref_frame_count > MAX_PICTURE_COUNT-2 || sps->ref_frame_count >= 32U){
 388         av_log(h->s.avctx, AV_LOG_ERROR, "too many reference frames\n");
 389         goto fail;
 390     }
 391     sps->gaps_in_frame_num_allowed_flag= get_bits1(&s->gb);
 392     sps->mb_width = get_ue_golomb(&s->gb) + 1;
 393     sps->mb_height= get_ue_golomb(&s->gb) + 1;
 394     if((unsigned)sps->mb_width >= INT_MAX/16 || (unsigned)sps->mb_height >= INT_MAX/16 ||
 395        av_image_check_size(16*sps->mb_width, 16*sps->mb_height, 0, h->s.avctx)){
 396         av_log(h->s.avctx, AV_LOG_ERROR, "mb_width/height overflow\n");
 397         goto fail;
 398     }
 399
 400     sps->frame_mbs_only_flag= get_bits1(&s->gb);
 401     if(!sps->frame_mbs_only_flag)
 402         sps->mb_aff= get_bits1(&s->gb);
 403     else
 404         sps->mb_aff= 0;
 405
 406     sps->direct_8x8_inference_flag= get_bits1(&s->gb);
 407     if(!sps->frame_mbs_only_flag && !sps->direct_8x8_inference_flag){
 408         av_log(h->s.avctx, AV_LOG_ERROR, "This stream was generated by a broken encoder, invalid 8x8 inference\n");
 409         goto fail;
 410     }
 411
 412 #ifndef ALLOW_INTERLACE
 413     if(sps->mb_aff)
 414         av_log(h->s.avctx, AV_LOG_ERROR, "MBAFF support not included; enable it at compile-time.\n");
 415 #endif
 416     sps->crop= get_bits1(&s->gb);
 417     if(sps->crop){
 418         int crop_vertical_limit   = sps->chroma_format_idc  & 2 ? 16 : 8;
 419         int crop_horizontal_limit = sps->chroma_format_idc == 3 ? 16 : 8;
 420         sps->crop_left  = get_ue_golomb(&s->gb);
 421         sps->crop_right = get_ue_golomb(&s->gb);
 422         sps->crop_top   = get_ue_golomb(&s->gb);
 423         sps->crop_bottom= get_ue_golomb(&s->gb);
 424         if(sps->crop_left || sps->crop_top){
 425             av_log(h->s.avctx, AV_LOG_ERROR, "insane cropping not completely supported, this could look slightly wrong ...\n");
 426         }
 427         if(sps->crop_right >= crop_horizontal_limit || sps->crop_bottom >= crop_vertical_limit){
 428             av_log(h->s.avctx, AV_LOG_ERROR, "brainfart cropping not supported, this could look slightly wrong ...\n");
 429         }
 430     }else{
 431         sps->crop_left  =
 432         sps->crop_right =
 433         sps->crop_top   =
 434         sps->crop_bottom= 0;
 435     }
 436
 437     sps->vui_parameters_present_flag= get_bits1(&s->gb);
 438     if( sps->vui_parameters_present_flag )
 439         if (decode_vui_parameters(h, sps) < 0)
 440             goto fail;
 441
 442     if(!sps->sar.den)
 443         sps->sar.den= 1;
 444
 445     if(s->avctx->debug&FF_DEBUG_PICT_INFO){
 446         static const char csp[4][5] = { "Gray", "420", "422", "444" };
 447         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",
 448                sps_id, sps->profile_idc, sps->level_idc,
 449                sps->poc_type,
 450                sps->ref_frame_count,
 451                sps->mb_width, sps->mb_height,
 452                sps->frame_mbs_only_flag ? "FRM" : (sps->mb_aff ? "MB-AFF" : "PIC-AFF"),
 453                sps->direct_8x8_inference_flag ? "8B8" : "",
 454                sps->crop_left, sps->crop_right,
 455                sps->crop_top, sps->crop_bottom,
 456                sps->vui_parameters_present_flag ? "VUI" : "",
 457                csp[sps->chroma_format_idc],
 458                sps->timing_info_present_flag ? sps->num_units_in_tick : 0,
 459                sps->timing_info_present_flag ? sps->time_scale : 0
 460                );
 461     }
 462     sps->new = 1;
 463
 464     av_free(h->sps_buffers[sps_id]);
 465     h->sps_buffers[sps_id] = sps;
 466     h->sps                 = *sps;
 467     h->current_sps_id      = sps_id;
 468
 469     return 0;
 470 fail:
 471     av_free(sps);
 472     return -1;
 473 }
 474
 475 static void
 476 build_qp_table(PPS *pps, int t, int index, const int depth)
 477 {
 478     int i;
 479     const int max_qp = 51 + 6*(depth-8);
 480     for(i = 0; i < max_qp+1; i++)
 481         pps->chroma_qp_table[t][i] = ff_h264_chroma_qp[depth-8][av_clip(i + index, 0, max_qp)];
 482 }
 483
 484 int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length){
 485     MpegEncContext * const s = &h->s;
 486     unsigned int pps_id= get_ue_golomb(&s->gb);
 487     PPS *pps;
 488     const int qp_bd_offset = 6*(h->sps.bit_depth_luma-8);
 489     int bits_left;
 490
 491     if(pps_id >= MAX_PPS_COUNT) {
 492         av_log(h->s.avctx, AV_LOG_ERROR, "pps_id (%d) out of range\n", pps_id);
 493         return -1;
 494     } else if (h->sps.bit_depth_luma > 10) {
 495         av_log(h->s.avctx, AV_LOG_ERROR, "Unimplemented luma bit depth=%d (max=10)\n", h->sps.bit_depth_luma);
 496         return AVERROR_PATCHWELCOME;
 497     }
 498
 499     pps= av_mallocz(sizeof(PPS));
 500     if(pps == NULL)
 501         return -1;
 502     pps->sps_id= get_ue_golomb_31(&s->gb);
 503     if((unsigned)pps->sps_id>=MAX_SPS_COUNT || h->sps_buffers[pps->sps_id] == NULL){
 504         av_log(h->s.avctx, AV_LOG_ERROR, "sps_id out of range\n");
 505         goto fail;
 506     }
 507
 508     pps->cabac= get_bits1(&s->gb);
 509     pps->pic_order_present= get_bits1(&s->gb);
 510     pps->slice_group_count= get_ue_golomb(&s->gb) + 1;
 511     if(pps->slice_group_count > 1 ){
 512         pps->mb_slice_group_map_type= get_ue_golomb(&s->gb);
 513         av_log(h->s.avctx, AV_LOG_ERROR, "FMO not supported\n");
 514         switch(pps->mb_slice_group_map_type){
 515         case 0:
 516 #if 0
 517 |   for( i = 0; i <= num_slice_groups_minus1; i++ ) |   |        |
 518 |    run_length[ i ]                                |1  |ue(v)   |
 519 #endif
 520             break;
 521         case 2:
 522 #if 0
 523 |   for( i = 0; i < num_slice_groups_minus1; i++ )  |   |        |
 524 |{                                                  |   |        |
 525 |    top_left_mb[ i ]                               |1  |ue(v)   |
 526 |    bottom_right_mb[ i ]                           |1  |ue(v)   |
 527 |   }                                               |   |        |
 528 #endif
 529             break;
 530         case 3:
 531         case 4:
 532         case 5:
 533 #if 0
 534 |   slice_group_change_direction_flag               |1  |u(1)    |
 535 |   slice_group_change_rate_minus1                  |1  |ue(v)   |
 536 #endif
 537             break;
 538         case 6:
 539 #if 0
 540 |   slice_group_id_cnt_minus1                       |1  |ue(v)   |
 541 |   for( i = 0; i <= slice_group_id_cnt_minus1; i++ |   |        |
 542 |)                                                  |   |        |
 543 |    slice_group_id[ i ]                            |1  |u(v)    |
 544 #endif
 545             break;
 546         }
 547     }
 548     pps->ref_count[0]= get_ue_golomb(&s->gb) + 1;
 549     pps->ref_count[1]= get_ue_golomb(&s->gb) + 1;
 550     if(pps->ref_count[0]-1 > 32-1 || pps->ref_count[1]-1 > 32-1){
 551         av_log(h->s.avctx, AV_LOG_ERROR, "reference overflow (pps)\n");
 552         goto fail;
 553     }
 554
 555     pps->weighted_pred= get_bits1(&s->gb);
 556     pps->weighted_bipred_idc= get_bits(&s->gb, 2);
 557     pps->init_qp= get_se_golomb(&s->gb) + 26 + qp_bd_offset;
 558     pps->init_qs= get_se_golomb(&s->gb) + 26 + qp_bd_offset;
 559     pps->chroma_qp_index_offset[0]= get_se_golomb(&s->gb);
 560     pps->deblocking_filter_parameters_present= get_bits1(&s->gb);
 561     pps->constrained_intra_pred= get_bits1(&s->gb);
 562     pps->redundant_pic_cnt_present = get_bits1(&s->gb);
 563
 564     pps->transform_8x8_mode= 0;
 565     h->dequant_coeff_pps= -1; //contents of sps/pps can change even if id doesn't, so reinit
 566     memcpy(pps->scaling_matrix4, h->sps_buffers[pps->sps_id]->scaling_matrix4, sizeof(pps->scaling_matrix4));
 567     memcpy(pps->scaling_matrix8, h->sps_buffers[pps->sps_id]->scaling_matrix8, sizeof(pps->scaling_matrix8));
 568
 569     bits_left = bit_length - get_bits_count(&s->gb);
 570     if (bits_left && (bits_left > 8 ||
 571                       show_bits(&s->gb, bits_left) != 1 << (bits_left - 1))) {
 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 }