git.sesse.net Git - ffmpeg/blob - libavcodec/cbs_h265_syntax_template.c

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 static int FUNC(rbsp_trailing_bits)(CodedBitstreamContext *ctx, RWContext *rw)
  20 {
  21     int err;
  22     av_unused int one = 1, zero = 0;
  23     xu(1, rbsp_stop_one_bit, one, 1, 1);
  24     while (byte_alignment(rw) != 0)
  25         xu(1, rbsp_alignment_zero_bit, zero, 0, 0);
  26
  27     return 0;
  28 }
  29
  30 static int FUNC(nal_unit_header)(CodedBitstreamContext *ctx, RWContext *rw,
  31                                  H265RawNALUnitHeader *current,
  32                                  int expected_nal_unit_type)
  33 {
  34     int err;
  35
  36     u(1, forbidden_zero_bit, 0, 0);
  37
  38     if (expected_nal_unit_type >= 0)
  39         u(6, nal_unit_type, expected_nal_unit_type,
  40                             expected_nal_unit_type);
  41     else
  42         u(6, nal_unit_type, 0, 63);
  43
  44     u(6, nuh_layer_id,          0, 62);
  45     u(3, nuh_temporal_id_plus1, 1,  7);
  46
  47     return 0;
  48 }
  49
  50 static int FUNC(byte_alignment)(CodedBitstreamContext *ctx, RWContext *rw)
  51 {
  52     int err;
  53     av_unused int one = 1, zero = 0;
  54     xu(1, alignment_bit_equal_to_one, one, 1, 1);
  55     while (byte_alignment(rw) != 0)
  56         xu(1, alignment_bit_equal_to_zero, zero, 0, 0);
  57
  58     return 0;
  59 }
  60
  61 static int FUNC(extension_data)(CodedBitstreamContext *ctx, RWContext *rw,
  62                                 H265RawPSExtensionData *current)
  63 {
  64     int err;
  65     size_t k;
  66 #ifdef READ
  67     GetBitContext start;
  68     uint8_t bit;
  69     start = *rw;
  70     for (k = 0; cbs_h2645_read_more_rbsp_data(rw); k++)
  71         skip_bits(rw, 1);
  72     current->bit_length = k;
  73     if (k > 0) {
  74         *rw = start;
  75         allocate(current->data, (current->bit_length + 7) / 8);
  76         for (k = 0; k < current->bit_length; k++) {
  77             xu(1, extension_data, bit, 0, 1);
  78             current->data[k / 8] |= bit << (7 - k % 8);
  79         }
  80     }
  81 #else
  82     for (k = 0; k < current->bit_length; k++)
  83         xu(1, extension_data, current->data[k / 8] >> (7 - k % 8), 0, 1);
  84 #endif
  85     return 0;
  86 }
  87
  88 static int FUNC(profile_tier_level)(CodedBitstreamContext *ctx, RWContext *rw,
  89                                     H265RawProfileTierLevel *current,
  90                                     int profile_present_flag,
  91                                     int max_num_sub_layers_minus1)
  92 {
  93     av_unused unsigned int zero = 0;
  94     int err, i, j;
  95
  96     if (profile_present_flag) {
  97         u(2, general_profile_space, 0, 0);
  98         flag(general_tier_flag);
  99         u(5, general_profile_idc, 0, 31);
 100
 101         for (j = 0; j < 32; j++)
 102             flag(general_profile_compatibility_flag[j]);
 103
 104         flag(general_progressive_source_flag);
 105         flag(general_interlaced_source_flag);
 106         flag(general_non_packed_constraint_flag);
 107         flag(general_frame_only_constraint_flag);
 108
 109 #define profile_compatible(x) (current->general_profile_idc == (x) || \
 110                                current->general_profile_compatibility_flag[x])
 111         if (profile_compatible(4) || profile_compatible(5) ||
 112             profile_compatible(6) || profile_compatible(7) ||
 113             profile_compatible(8) || profile_compatible(9) ||
 114             profile_compatible(10)) {
 115             flag(general_max_12bit_constraint_flag);
 116             flag(general_max_10bit_constraint_flag);
 117             flag(general_max_8bit_constraint_flag);
 118             flag(general_max_422chroma_constraint_flag);
 119             flag(general_max_420chroma_constraint_flag);
 120             flag(general_max_monochrome_constraint_flag);
 121             flag(general_intra_constraint_flag);
 122             flag(general_one_picture_only_constraint_flag);
 123             flag(general_lower_bit_rate_constraint_flag);
 124
 125             if (profile_compatible(5) || profile_compatible(9) ||
 126                 profile_compatible(10)) {
 127                 flag(general_max_14bit_constraint_flag);
 128                 xu(24, general_reserved_zero_33bits, zero, 0, 0);
 129                 xu(9, general_reserved_zero_33bits, zero, 0, 0);
 130             } else {
 131                 xu(24, general_reserved_zero_34bits, zero, 0, 0);
 132                 xu(10, general_reserved_zero_34bits, zero, 0, 0);
 133             }
 134         } else {
 135             xu(24, general_reserved_zero_43bits, zero, 0, 0);
 136             xu(19, general_reserved_zero_43bits, zero, 0, 0);
 137         }
 138
 139         if (profile_compatible(1) || profile_compatible(2) ||
 140             profile_compatible(3) || profile_compatible(4) ||
 141             profile_compatible(5) || profile_compatible(9)) {
 142             flag(general_inbld_flag);
 143         } else {
 144             xu(1, general_reserved_zero_bit, zero, 0, 0);
 145         }
 146 #undef profile_compatible
 147     }
 148
 149     u(8, general_level_idc, 0, 255);
 150
 151     for (i = 0; i < max_num_sub_layers_minus1; i++) {
 152         flag(sub_layer_profile_present_flag[i]);
 153         flag(sub_layer_level_present_flag[i]);
 154     }
 155
 156     if (max_num_sub_layers_minus1 > 0) {
 157         for (i = max_num_sub_layers_minus1; i < 8; i++) {
 158             av_unused int zero = 0;
 159             xu(2, reserved_zero_2bits, zero, 0, 0);
 160         }
 161     }
 162
 163     for (i = 0; i < max_num_sub_layers_minus1; i++) {
 164         if (current->sub_layer_profile_present_flag[i])
 165             return AVERROR_PATCHWELCOME;
 166         if (current->sub_layer_level_present_flag[i])
 167             return AVERROR_PATCHWELCOME;
 168     }
 169
 170     return 0;
 171 }
 172
 173 static int FUNC(sub_layer_hrd_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
 174                                           H265RawHRDParameters *hrd,
 175                                           int nal, int sub_layer_id)
 176 {
 177     H265RawSubLayerHRDParameters *current;
 178     int err, i;
 179
 180     if (nal)
 181         current = &hrd->nal_sub_layer_hrd_parameters[sub_layer_id];
 182     else
 183         current = &hrd->vcl_sub_layer_hrd_parameters[sub_layer_id];
 184
 185     for (i = 0; i <= hrd->cpb_cnt_minus1[sub_layer_id]; i++) {
 186         ue(bit_rate_value_minus1[i], 0, UINT32_MAX - 1);
 187         ue(cpb_size_value_minus1[i], 0, UINT32_MAX - 1);
 188         if (hrd->sub_pic_hrd_params_present_flag) {
 189             ue(cpb_size_du_value_minus1[i], 0, UINT32_MAX - 1);
 190             ue(bit_rate_du_value_minus1[i], 0, UINT32_MAX - 1);
 191         }
 192         flag(cbr_flag[i]);
 193     }
 194
 195     return 0;
 196 }
 197
 198 static int FUNC(hrd_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
 199                                 H265RawHRDParameters *current, int common_inf_present_flag,
 200                                 int max_num_sub_layers_minus1)
 201 {
 202     int err, i;
 203
 204     if (common_inf_present_flag) {
 205         flag(nal_hrd_parameters_present_flag);
 206         flag(vcl_hrd_parameters_present_flag);
 207
 208         if (current->nal_hrd_parameters_present_flag ||
 209             current->vcl_hrd_parameters_present_flag) {
 210             flag(sub_pic_hrd_params_present_flag);
 211             if (current->sub_pic_hrd_params_present_flag) {
 212                 u(8, tick_divisor_minus2, 0, 255);
 213                 u(5, du_cpb_removal_delay_increment_length_minus1, 0, 31);
 214                 flag(sub_pic_cpb_params_in_pic_timing_sei_flag);
 215                 u(5, dpb_output_delay_du_length_minus1, 0, 31);
 216             }
 217
 218             u(4, bit_rate_scale, 0, 15);
 219             u(4, cpb_size_scale, 0, 15);
 220             if (current->sub_pic_hrd_params_present_flag)
 221                 u(4, cpb_size_du_scale, 0, 15);
 222
 223             u(5, initial_cpb_removal_delay_length_minus1, 0, 31);
 224             u(5, au_cpb_removal_delay_length_minus1,      0, 31);
 225             u(5, dpb_output_delay_length_minus1,          0, 31);
 226         } else {
 227             infer(sub_pic_hrd_params_present_flag, 0);
 228
 229             infer(initial_cpb_removal_delay_length_minus1, 23);
 230             infer(au_cpb_removal_delay_length_minus1,      23);
 231             infer(dpb_output_delay_length_minus1,          23);
 232         }
 233     }
 234
 235     for (i = 0; i <= max_num_sub_layers_minus1; i++) {
 236         flag(fixed_pic_rate_general_flag[i]);
 237
 238         if (!current->fixed_pic_rate_general_flag[i])
 239             flag(fixed_pic_rate_within_cvs_flag[i]);
 240         else
 241             infer(fixed_pic_rate_within_cvs_flag[i], 1);
 242
 243         if (current->fixed_pic_rate_within_cvs_flag[i]) {
 244             ue(elemental_duration_in_tc_minus1[i], 0, 2047);
 245             infer(low_delay_hrd_flag[i], 0);
 246         } else
 247             flag(low_delay_hrd_flag[i]);
 248
 249         if (!current->low_delay_hrd_flag[i])
 250             ue(cpb_cnt_minus1[i], 0, 31);
 251         else
 252             infer(cpb_cnt_minus1[i], 0);
 253
 254         if (current->nal_hrd_parameters_present_flag)
 255             CHECK(FUNC(sub_layer_hrd_parameters)(ctx, rw, current, 0, i));
 256         if (current->vcl_hrd_parameters_present_flag)
 257             CHECK(FUNC(sub_layer_hrd_parameters)(ctx, rw, current, 1, i));
 258     }
 259
 260     return 0;
 261 }
 262
 263 static int FUNC(vui_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
 264                                 H265RawVUI *current, const H265RawSPS *sps)
 265 {
 266     int err;
 267
 268     flag(aspect_ratio_info_present_flag);
 269     if (current->aspect_ratio_info_present_flag) {
 270         u(8, aspect_ratio_idc, 0, 255);
 271         if (current->aspect_ratio_idc == 255) {
 272             u(16, sar_width,  0, 65535);
 273             u(16, sar_height, 0, 65535);
 274         }
 275     } else {
 276         infer(aspect_ratio_idc, 0);
 277     }
 278
 279     flag(overscan_info_present_flag);
 280     if (current->overscan_info_present_flag)
 281         flag(overscan_appropriate_flag);
 282
 283     flag(video_signal_type_present_flag);
 284     if (current->video_signal_type_present_flag) {
 285         u(3, video_format, 0, 7);
 286         flag(video_full_range_flag);
 287         flag(colour_description_present_flag);
 288         if (current->colour_description_present_flag) {
 289             u(8, colour_primaries,         0, 255);
 290             u(8, transfer_characteristics, 0, 255);
 291             u(8, matrix_coefficients,      0, 255);
 292         } else {
 293             infer(colour_primaries,         2);
 294             infer(transfer_characteristics, 2);
 295             infer(matrix_coefficients,      2);
 296         }
 297     } else {
 298         infer(video_format,             5);
 299         infer(video_full_range_flag,    0);
 300         infer(colour_primaries,         2);
 301         infer(transfer_characteristics, 2);
 302         infer(matrix_coefficients,      2);
 303     }
 304
 305     flag(chroma_loc_info_present_flag);
 306     if (current->chroma_loc_info_present_flag) {
 307         ue(chroma_sample_loc_type_top_field,    0, 5);
 308         ue(chroma_sample_loc_type_bottom_field, 0, 5);
 309     } else {
 310         infer(chroma_sample_loc_type_top_field,    0);
 311         infer(chroma_sample_loc_type_bottom_field, 0);
 312     }
 313
 314     flag(neutral_chroma_indication_flag);
 315     flag(field_seq_flag);
 316     flag(frame_field_info_present_flag);
 317
 318     flag(default_display_window_flag);
 319     if (current->default_display_window_flag) {
 320         ue(def_disp_win_left_offset,   0, 16384);
 321         ue(def_disp_win_right_offset,  0, 16384);
 322         ue(def_disp_win_top_offset,    0, 16384);
 323         ue(def_disp_win_bottom_offset, 0, 16384);
 324     }
 325
 326     flag(vui_timing_info_present_flag);
 327     if (current->vui_timing_info_present_flag) {
 328         u(32, vui_num_units_in_tick, 1, UINT32_MAX);
 329         u(32, vui_time_scale,        1, UINT32_MAX);
 330         flag(vui_poc_proportional_to_timing_flag);
 331         if (current->vui_poc_proportional_to_timing_flag)
 332             ue(vui_num_ticks_poc_diff_one_minus1, 0, UINT32_MAX - 1);
 333
 334         flag(vui_hrd_parameters_present_flag);
 335         if (current->vui_hrd_parameters_present_flag) {
 336             CHECK(FUNC(hrd_parameters)(ctx, rw, &current->hrd_parameters,
 337                                        1, sps->sps_max_sub_layers_minus1));
 338         }
 339     }
 340
 341     flag(bitstream_restriction_flag);
 342     if (current->bitstream_restriction_flag) {
 343         flag(tiles_fixed_structure_flag);
 344         flag(motion_vectors_over_pic_boundaries_flag);
 345         flag(restricted_ref_pic_lists_flag);
 346         ue(min_spatial_segmentation_idc,  0, 4095);
 347         ue(max_bytes_per_pic_denom,       0, 16);
 348         ue(max_bits_per_min_cu_denom,     0, 16);
 349         ue(log2_max_mv_length_horizontal, 0, 16);
 350         ue(log2_max_mv_length_vertical,   0, 16);
 351     } else {
 352         infer(tiles_fixed_structure_flag,    0);
 353         infer(motion_vectors_over_pic_boundaries_flag, 1);
 354         infer(min_spatial_segmentation_idc,  0);
 355         infer(max_bytes_per_pic_denom,       2);
 356         infer(max_bits_per_min_cu_denom,     1);
 357         infer(log2_max_mv_length_horizontal, 15);
 358         infer(log2_max_mv_length_vertical,   15);
 359     }
 360
 361     return 0;
 362 }
 363
 364 static int FUNC(vps)(CodedBitstreamContext *ctx, RWContext *rw,
 365                      H265RawVPS *current)
 366 {
 367     int err, i, j;
 368
 369     HEADER("Video Parameter Set");
 370
 371     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, HEVC_NAL_VPS));
 372
 373     u(4, vps_video_parameter_set_id, 0, 15);
 374
 375     flag(vps_base_layer_internal_flag);
 376     flag(vps_base_layer_available_flag);
 377     u(6, vps_max_layers_minus1,     0, HEVC_MAX_LAYERS - 1);
 378     u(3, vps_max_sub_layers_minus1, 0, HEVC_MAX_SUB_LAYERS - 1);
 379     flag(vps_temporal_id_nesting_flag);
 380
 381     if (current->vps_max_sub_layers_minus1 == 0 &&
 382         current->vps_temporal_id_nesting_flag != 1) {
 383         av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid stream: "
 384                "vps_temporal_id_nesting_flag must be 1 if "
 385                "vps_max_sub_layers_minus1 is 0.\n");
 386         return AVERROR_INVALIDDATA;
 387     }
 388
 389     {
 390         av_unused uint16_t ffff = 0xffff;
 391         xu(16, vps_reserved_0xffff_16bits, ffff, 0xffff, 0xffff);
 392     }
 393
 394     CHECK(FUNC(profile_tier_level)(ctx, rw, &current->profile_tier_level,
 395                                    1, current->vps_max_sub_layers_minus1));
 396
 397     flag(vps_sub_layer_ordering_info_present_flag);
 398     for (i = (current->vps_sub_layer_ordering_info_present_flag ?
 399               0 : current->vps_max_sub_layers_minus1);
 400          i <= current->vps_max_sub_layers_minus1; i++) {
 401         ue(vps_max_dec_pic_buffering_minus1[i], 0, HEVC_MAX_DPB_SIZE - 1);
 402         ue(vps_max_num_reorder_pics[i],         0, current->vps_max_dec_pic_buffering_minus1[i]);
 403         ue(vps_max_latency_increase_plus1[i],   0, UINT32_MAX - 1);
 404     }
 405     if (!current->vps_sub_layer_ordering_info_present_flag) {
 406         for (i = 0; i < current->vps_max_sub_layers_minus1; i++) {
 407             infer(vps_max_dec_pic_buffering_minus1[i],
 408                   current->vps_max_dec_pic_buffering_minus1[current->vps_max_sub_layers_minus1]);
 409             infer(vps_max_num_reorder_pics[i],
 410                   current->vps_max_num_reorder_pics[current->vps_max_sub_layers_minus1]);
 411             infer(vps_max_latency_increase_plus1[i],
 412                   current->vps_max_latency_increase_plus1[current->vps_max_sub_layers_minus1]);
 413         }
 414     }
 415
 416     u(6, vps_max_layer_id,        0, HEVC_MAX_LAYERS - 1);
 417     ue(vps_num_layer_sets_minus1, 0, HEVC_MAX_LAYER_SETS - 1);
 418     for (i = 1; i <= current->vps_num_layer_sets_minus1; i++) {
 419         for (j = 0; j <= current->vps_max_layer_id; j++)
 420             flag(layer_id_included_flag[i][j]);
 421     }
 422     for (j = 0; j <= current->vps_max_layer_id; j++)
 423         infer(layer_id_included_flag[0][j], j == 0);
 424
 425     flag(vps_timing_info_present_flag);
 426     if (current->vps_timing_info_present_flag) {
 427         u(32, vps_num_units_in_tick, 1, UINT32_MAX);
 428         u(32, vps_time_scale,        1, UINT32_MAX);
 429         flag(vps_poc_proportional_to_timing_flag);
 430         if (current->vps_poc_proportional_to_timing_flag)
 431             ue(vps_num_ticks_poc_diff_one_minus1, 0, UINT32_MAX - 1);
 432         ue(vps_num_hrd_parameters, 0, current->vps_num_layer_sets_minus1 + 1);
 433         for (i = 0; i < current->vps_num_hrd_parameters; i++) {
 434             ue(hrd_layer_set_idx[i],
 435                current->vps_base_layer_internal_flag ? 0 : 1,
 436                current->vps_num_layer_sets_minus1);
 437             if (i > 0)
 438                 flag(cprms_present_flag[i]);
 439             else
 440                 infer(cprms_present_flag[0], 1);
 441
 442             CHECK(FUNC(hrd_parameters)(ctx, rw, &current->hrd_parameters[i],
 443                                        current->cprms_present_flag[i],
 444                                        current->vps_max_sub_layers_minus1));
 445         }
 446     }
 447
 448     flag(vps_extension_flag);
 449     if (current->vps_extension_flag)
 450         CHECK(FUNC(extension_data)(ctx, rw, &current->extension_data));
 451
 452     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
 453
 454     return 0;
 455 }
 456
 457 static int FUNC(st_ref_pic_set)(CodedBitstreamContext *ctx, RWContext *rw,
 458                                 H265RawSTRefPicSet *current, int st_rps_idx,
 459                                 const H265RawSPS *sps)
 460 {
 461     int err, i, j;
 462
 463     if (st_rps_idx != 0)
 464         flag(inter_ref_pic_set_prediction_flag);
 465     else
 466         infer(inter_ref_pic_set_prediction_flag, 0);
 467
 468     if (current->inter_ref_pic_set_prediction_flag) {
 469         unsigned int ref_rps_idx, num_delta_pocs;
 470         const H265RawSTRefPicSet *ref;
 471         int delta_rps, d_poc;
 472         int ref_delta_poc_s0[HEVC_MAX_REFS], ref_delta_poc_s1[HEVC_MAX_REFS];
 473         int delta_poc_s0[HEVC_MAX_REFS], delta_poc_s1[HEVC_MAX_REFS];
 474         uint8_t used_by_curr_pic_s0[HEVC_MAX_REFS],
 475                 used_by_curr_pic_s1[HEVC_MAX_REFS];
 476
 477         if (st_rps_idx == sps->num_short_term_ref_pic_sets)
 478             ue(delta_idx_minus1, 0, st_rps_idx - 1);
 479         else
 480             infer(delta_idx_minus1, 0);
 481
 482         ref_rps_idx = st_rps_idx - (current->delta_idx_minus1 + 1);
 483         ref = &sps->st_ref_pic_set[ref_rps_idx];
 484         num_delta_pocs = ref->num_negative_pics + ref->num_positive_pics;
 485
 486         flag(delta_rps_sign);
 487         ue(abs_delta_rps_minus1, 0, INT16_MAX);
 488         delta_rps = (1 - 2 * current->delta_rps_sign) *
 489             (current->abs_delta_rps_minus1 + 1);
 490
 491         for (j = 0; j <= num_delta_pocs; j++) {
 492             flag(used_by_curr_pic_flag[j]);
 493             if (!current->used_by_curr_pic_flag[j])
 494                 flag(use_delta_flag[j]);
 495             else
 496                 infer(use_delta_flag[j], 1);
 497         }
 498
 499         // Since the stored form of an RPS here is actually the delta-step
 500         // form used when inter_ref_pic_set_prediction_flag is not set, we
 501         // need to reconstruct that here in order to be able to refer to
 502         // the RPS later (which is required for parsing, because we don't
 503         // even know what syntax elements appear without it).  Therefore,
 504         // this code takes the delta-step form of the reference set, turns
 505         // it into the delta-array form, applies the prediction process of
 506         // 7.4.8, converts the result back to the delta-step form, and
 507         // stores that as the current set for future use.  Note that the
 508         // inferences here mean that writers using prediction will need
 509         // to fill in the delta-step values correctly as well - since the
 510         // whole RPS prediction process is somewhat overly sophisticated,
 511         // this hopefully forms a useful check for them to ensure their
 512         // predicted form actually matches what was intended rather than
 513         // an onerous additional requirement.
 514
 515         d_poc = 0;
 516         for (i = 0; i < ref->num_negative_pics; i++) {
 517             d_poc -= ref->delta_poc_s0_minus1[i] + 1;
 518             ref_delta_poc_s0[i] = d_poc;
 519         }
 520         d_poc = 0;
 521         for (i = 0; i < ref->num_positive_pics; i++) {
 522             d_poc += ref->delta_poc_s1_minus1[i] + 1;
 523             ref_delta_poc_s1[i] = d_poc;
 524         }
 525
 526         i = 0;
 527         for (j = ref->num_positive_pics - 1; j >= 0; j--) {
 528             d_poc = ref_delta_poc_s1[j] + delta_rps;
 529             if (d_poc < 0 && current->use_delta_flag[ref->num_negative_pics + j]) {
 530                 delta_poc_s0[i] = d_poc;
 531                 used_by_curr_pic_s0[i++] =
 532                     current->used_by_curr_pic_flag[ref->num_negative_pics + j];
 533             }
 534         }
 535         if (delta_rps < 0 && current->use_delta_flag[num_delta_pocs]) {
 536             delta_poc_s0[i] = delta_rps;
 537             used_by_curr_pic_s0[i++] =
 538                 current->used_by_curr_pic_flag[num_delta_pocs];
 539         }
 540         for (j = 0; j < ref->num_negative_pics; j++) {
 541             d_poc = ref_delta_poc_s0[j] + delta_rps;
 542             if (d_poc < 0 && current->use_delta_flag[j]) {
 543                 delta_poc_s0[i] = d_poc;
 544                 used_by_curr_pic_s0[i++] = current->used_by_curr_pic_flag[j];
 545             }
 546         }
 547
 548         infer(num_negative_pics, i);
 549         for (i = 0; i < current->num_negative_pics; i++) {
 550             infer(delta_poc_s0_minus1[i],
 551                   -(delta_poc_s0[i] - (i == 0 ? 0 : delta_poc_s0[i - 1])) - 1);
 552             infer(used_by_curr_pic_s0_flag[i], used_by_curr_pic_s0[i]);
 553         }
 554
 555         i = 0;
 556         for (j = ref->num_negative_pics - 1; j >= 0; j--) {
 557             d_poc = ref_delta_poc_s0[j] + delta_rps;
 558             if (d_poc > 0 && current->use_delta_flag[j]) {
 559                 delta_poc_s1[i] = d_poc;
 560                 used_by_curr_pic_s1[i++] = current->used_by_curr_pic_flag[j];
 561             }
 562         }
 563         if (delta_rps > 0 && current->use_delta_flag[num_delta_pocs]) {
 564             delta_poc_s1[i] = delta_rps;
 565             used_by_curr_pic_s1[i++] =
 566                 current->used_by_curr_pic_flag[num_delta_pocs];
 567         }
 568         for (j = 0; j < ref->num_positive_pics; j++) {
 569             d_poc = ref_delta_poc_s1[j] + delta_rps;
 570             if (d_poc > 0 && current->use_delta_flag[ref->num_negative_pics + j]) {
 571                 delta_poc_s1[i] = d_poc;
 572                 used_by_curr_pic_s1[i++] =
 573                     current->used_by_curr_pic_flag[ref->num_negative_pics + j];
 574             }
 575         }
 576
 577         infer(num_positive_pics, i);
 578         for (i = 0; i < current->num_positive_pics; i++) {
 579             infer(delta_poc_s1_minus1[i],
 580                   delta_poc_s1[i] - (i == 0 ? 0 : delta_poc_s1[i - 1]) - 1);
 581             infer(used_by_curr_pic_s1_flag[i], used_by_curr_pic_s1[i]);
 582         }
 583
 584     } else {
 585         ue(num_negative_pics, 0, 15);
 586         ue(num_positive_pics, 0, 15 - current->num_negative_pics);
 587
 588         for (i = 0; i < current->num_negative_pics; i++) {
 589             ue(delta_poc_s0_minus1[i], 0, INT16_MAX);
 590             flag(used_by_curr_pic_s0_flag[i]);
 591         }
 592
 593         for (i = 0; i < current->num_positive_pics; i++) {
 594             ue(delta_poc_s1_minus1[i], 0, INT16_MAX);
 595             flag(used_by_curr_pic_s1_flag[i]);
 596         }
 597     }
 598
 599     return 0;
 600 }
 601
 602 static int FUNC(scaling_list_data)(CodedBitstreamContext *ctx, RWContext *rw,
 603                                    H265RawScalingList *current)
 604 {
 605     int sizeId, matrixId;
 606     int err, n, i;
 607
 608     for (sizeId = 0; sizeId < 4; sizeId++) {
 609         for (matrixId = 0; matrixId < 6; matrixId += (sizeId == 3 ? 3 : 1)) {
 610             flag(scaling_list_pred_mode_flag[sizeId][matrixId]);
 611             if (!current->scaling_list_pred_mode_flag[sizeId][matrixId]) {
 612                 ue(scaling_list_pred_matrix_id_delta[sizeId][matrixId],
 613                    0, sizeId == 3 ? matrixId / 3 : matrixId);
 614             } else {
 615                 n = FFMIN(64, 1 << (4 + (sizeId << 1)));
 616                 if (sizeId > 1)
 617                     se(scaling_list_dc_coef_minus8[sizeId - 2][matrixId], -7, +247);
 618                 for (i = 0; i < n; i++) {
 619                     xse(scaling_list_delta_coeff,
 620                         current->scaling_list_delta_coeff[sizeId][matrixId][i],
 621                         -128, +127);
 622                 }
 623             }
 624         }
 625     }
 626
 627     return 0;
 628 }
 629
 630 static int FUNC(sps_range_extension)(CodedBitstreamContext *ctx, RWContext *rw,
 631                                      H265RawSPS *current)
 632 {
 633     int err;
 634
 635     flag(transform_skip_rotation_enabled_flag);
 636     flag(transform_skip_context_enabled_flag);
 637     flag(implicit_rdpcm_enabled_flag);
 638     flag(explicit_rdpcm_enabled_flag);
 639     flag(extended_precision_processing_flag);
 640     flag(intra_smoothing_disabled_flag);
 641     flag(high_precision_offsets_enabled_flag);
 642     flag(persistent_rice_adaptation_enabled_flag);
 643     flag(cabac_bypass_alignment_enabled_flag);
 644
 645     return 0;
 646 }
 647
 648 static int FUNC(sps_scc_extension)(CodedBitstreamContext *ctx, RWContext *rw,
 649                                    H265RawSPS *current)
 650 {
 651     int err, comp, i;
 652
 653     flag(sps_curr_pic_ref_enabled_flag);
 654
 655     flag(palette_mode_enabled_flag);
 656     if (current->palette_mode_enabled_flag) {
 657         ue(palette_max_size, 0, 64);
 658         ue(delta_palette_max_predictor_size, 0, 128);
 659
 660         flag(sps_palette_predictor_initializer_present_flag);
 661         if (current->sps_palette_predictor_initializer_present_flag) {
 662             ue(sps_num_palette_predictor_initializer_minus1, 0, 128);
 663             for (comp = 0; comp < (current->chroma_format_idc ? 3 : 1); comp++) {
 664                 int bit_depth = comp == 0 ? current->bit_depth_luma_minus8 + 8
 665                                           : current->bit_depth_chroma_minus8 + 8;
 666                 for (i = 0; i <= current->sps_num_palette_predictor_initializer_minus1; i++)
 667                     u(bit_depth, sps_palette_predictor_initializers[comp][i],
 668                       0, (1 << bit_depth) - 1);
 669             }
 670         }
 671     }
 672
 673     u(2, motion_vector_resolution_control_idc, 0, 2);
 674     flag(intra_boundary_filtering_disable_flag);
 675
 676     return 0;
 677 }
 678
 679 static int FUNC(sps)(CodedBitstreamContext *ctx, RWContext *rw,
 680                      H265RawSPS *current)
 681 {
 682     CodedBitstreamH265Context *h265 = ctx->priv_data;
 683     const H265RawVPS *vps;
 684     int err, i;
 685     unsigned int min_cb_log2_size_y, ctb_log2_size_y,
 686                  min_cb_size_y,   min_tb_log2_size_y;
 687
 688     HEADER("Sequence Parameter Set");
 689
 690     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, HEVC_NAL_SPS));
 691
 692     u(4, sps_video_parameter_set_id, 0, 15);
 693     h265->active_vps = vps = h265->vps[current->sps_video_parameter_set_id];
 694
 695     u(3, sps_max_sub_layers_minus1, 0, HEVC_MAX_SUB_LAYERS - 1);
 696     flag(sps_temporal_id_nesting_flag);
 697     if (vps) {
 698         if (vps->vps_max_sub_layers_minus1 > current->sps_max_sub_layers_minus1) {
 699             av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid stream: "
 700                    "sps_max_sub_layers_minus1 (%d) must be less than or equal to "
 701                    "vps_max_sub_layers_minus1 (%d).\n",
 702                    vps->vps_max_sub_layers_minus1,
 703                    current->sps_max_sub_layers_minus1);
 704             return AVERROR_INVALIDDATA;
 705         }
 706         if (vps->vps_temporal_id_nesting_flag &&
 707             !current->sps_temporal_id_nesting_flag) {
 708             av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid stream: "
 709                    "sps_temporal_id_nesting_flag must be 1 if "
 710                    "vps_temporal_id_nesting_flag is 1.\n");
 711             return AVERROR_INVALIDDATA;
 712         }
 713     }
 714
 715     CHECK(FUNC(profile_tier_level)(ctx, rw, &current->profile_tier_level,
 716                                    1, current->sps_max_sub_layers_minus1));
 717
 718     ue(sps_seq_parameter_set_id, 0, 15);
 719
 720     ue(chroma_format_idc, 0, 3);
 721     if (current->chroma_format_idc == 3)
 722         flag(separate_colour_plane_flag);
 723     else
 724         infer(separate_colour_plane_flag, 0);
 725
 726     ue(pic_width_in_luma_samples,  1, HEVC_MAX_WIDTH);
 727     ue(pic_height_in_luma_samples, 1, HEVC_MAX_HEIGHT);
 728
 729     flag(conformance_window_flag);
 730     if (current->conformance_window_flag) {
 731         ue(conf_win_left_offset,   0, current->pic_width_in_luma_samples);
 732         ue(conf_win_right_offset,  0, current->pic_width_in_luma_samples);
 733         ue(conf_win_top_offset,    0, current->pic_height_in_luma_samples);
 734         ue(conf_win_bottom_offset, 0, current->pic_height_in_luma_samples);
 735     } else {
 736         infer(conf_win_left_offset,   0);
 737         infer(conf_win_right_offset,  0);
 738         infer(conf_win_top_offset,    0);
 739         infer(conf_win_bottom_offset, 0);
 740     }
 741
 742     ue(bit_depth_luma_minus8,   0, 8);
 743     ue(bit_depth_chroma_minus8, 0, 8);
 744
 745     ue(log2_max_pic_order_cnt_lsb_minus4, 0, 12);
 746
 747     flag(sps_sub_layer_ordering_info_present_flag);
 748     for (i = (current->sps_sub_layer_ordering_info_present_flag ?
 749               0 : current->sps_max_sub_layers_minus1);
 750          i <= current->sps_max_sub_layers_minus1; i++) {
 751         ue(sps_max_dec_pic_buffering_minus1[i], 0, HEVC_MAX_DPB_SIZE - 1);
 752         ue(sps_max_num_reorder_pics[i],         0, current->sps_max_dec_pic_buffering_minus1[i]);
 753         ue(sps_max_latency_increase_plus1[i],   0, UINT32_MAX - 1);
 754     }
 755     if (!current->sps_sub_layer_ordering_info_present_flag) {
 756         for (i = 0; i < current->sps_max_sub_layers_minus1; i++) {
 757             infer(sps_max_dec_pic_buffering_minus1[i],
 758                   current->sps_max_dec_pic_buffering_minus1[current->sps_max_sub_layers_minus1]);
 759             infer(sps_max_num_reorder_pics[i],
 760                   current->sps_max_num_reorder_pics[current->sps_max_sub_layers_minus1]);
 761             infer(sps_max_latency_increase_plus1[i],
 762                   current->sps_max_latency_increase_plus1[current->sps_max_sub_layers_minus1]);
 763         }
 764     }
 765
 766     ue(log2_min_luma_coding_block_size_minus3,   0, 3);
 767     min_cb_log2_size_y = current->log2_min_luma_coding_block_size_minus3 + 3;
 768
 769     ue(log2_diff_max_min_luma_coding_block_size, 0, 3);
 770     ctb_log2_size_y = min_cb_log2_size_y +
 771         current->log2_diff_max_min_luma_coding_block_size;
 772
 773     min_cb_size_y = 1 << min_cb_log2_size_y;
 774     if (current->pic_width_in_luma_samples  % min_cb_size_y ||
 775         current->pic_height_in_luma_samples % min_cb_size_y) {
 776         av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid dimensions: %ux%u not divisible "
 777                "by MinCbSizeY = %u.\n", current->pic_width_in_luma_samples,
 778                current->pic_height_in_luma_samples, min_cb_size_y);
 779         return AVERROR_INVALIDDATA;
 780     }
 781
 782     ue(log2_min_luma_transform_block_size_minus2, 0, min_cb_log2_size_y - 3);
 783     min_tb_log2_size_y = current->log2_min_luma_transform_block_size_minus2 + 2;
 784
 785     ue(log2_diff_max_min_luma_transform_block_size,
 786        0, FFMIN(ctb_log2_size_y, 5) - min_tb_log2_size_y);
 787
 788     ue(max_transform_hierarchy_depth_inter,
 789        0, ctb_log2_size_y - min_tb_log2_size_y);
 790     ue(max_transform_hierarchy_depth_intra,
 791        0, ctb_log2_size_y - min_tb_log2_size_y);
 792
 793     flag(scaling_list_enabled_flag);
 794     if (current->scaling_list_enabled_flag) {
 795         flag(sps_scaling_list_data_present_flag);
 796         if (current->sps_scaling_list_data_present_flag)
 797             CHECK(FUNC(scaling_list_data)(ctx, rw, &current->scaling_list));
 798     } else {
 799         infer(sps_scaling_list_data_present_flag, 0);
 800     }
 801
 802     flag(amp_enabled_flag);
 803     flag(sample_adaptive_offset_enabled_flag);
 804
 805     flag(pcm_enabled_flag);
 806     if (current->pcm_enabled_flag) {
 807         u(4, pcm_sample_bit_depth_luma_minus1,
 808           0, current->bit_depth_luma_minus8 + 8 - 1);
 809         u(4, pcm_sample_bit_depth_chroma_minus1,
 810           0, current->bit_depth_chroma_minus8 + 8 - 1);
 811
 812         ue(log2_min_pcm_luma_coding_block_size_minus3,
 813            FFMIN(min_cb_log2_size_y, 5) - 3, FFMIN(ctb_log2_size_y, 5) - 3);
 814         ue(log2_diff_max_min_pcm_luma_coding_block_size,
 815            0, FFMIN(ctb_log2_size_y, 5) - (current->log2_min_pcm_luma_coding_block_size_minus3 + 3));
 816
 817         flag(pcm_loop_filter_disabled_flag);
 818     }
 819
 820     ue(num_short_term_ref_pic_sets, 0, HEVC_MAX_SHORT_TERM_REF_PIC_SETS);
 821     for (i = 0; i < current->num_short_term_ref_pic_sets; i++)
 822         CHECK(FUNC(st_ref_pic_set)(ctx, rw, &current->st_ref_pic_set[i], i, current));
 823
 824     flag(long_term_ref_pics_present_flag);
 825     if (current->long_term_ref_pics_present_flag) {
 826         ue(num_long_term_ref_pics_sps, 0, HEVC_MAX_LONG_TERM_REF_PICS);
 827         for (i = 0; i < current->num_long_term_ref_pics_sps; i++) {
 828             u(current->log2_max_pic_order_cnt_lsb_minus4 + 4,
 829               lt_ref_pic_poc_lsb_sps[i],
 830               0, (1 << (current->log2_max_pic_order_cnt_lsb_minus4 + 4)) - 1);
 831             flag(used_by_curr_pic_lt_sps_flag[i]);
 832         }
 833     }
 834
 835     flag(sps_temporal_mvp_enabled_flag);
 836     flag(strong_intra_smoothing_enabled_flag);
 837
 838     flag(vui_parameters_present_flag);
 839     if (current->vui_parameters_present_flag)
 840         CHECK(FUNC(vui_parameters)(ctx, rw, &current->vui, current));
 841
 842     flag(sps_extension_present_flag);
 843     if (current->sps_extension_present_flag) {
 844         flag(sps_range_extension_flag);
 845         flag(sps_multilayer_extension_flag);
 846         flag(sps_3d_extension_flag);
 847         flag(sps_scc_extension_flag);
 848         u(4, sps_extension_4bits, 0, (1 << 4) - 1);
 849     }
 850
 851     if (current->sps_range_extension_flag)
 852         CHECK(FUNC(sps_range_extension)(ctx, rw, current));
 853     if (current->sps_multilayer_extension_flag)
 854         return AVERROR_PATCHWELCOME;
 855     if (current->sps_3d_extension_flag)
 856         return AVERROR_PATCHWELCOME;
 857     if (current->sps_scc_extension_flag)
 858         CHECK(FUNC(sps_scc_extension)(ctx, rw, current));
 859     if (current->sps_extension_4bits)
 860         CHECK(FUNC(extension_data)(ctx, rw, &current->extension_data));
 861
 862     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
 863
 864     return 0;
 865 }
 866
 867 static int FUNC(pps_range_extension)(CodedBitstreamContext *ctx, RWContext *rw,
 868                                      H265RawPPS *current)
 869 {
 870     CodedBitstreamH265Context *h265 = ctx->priv_data;
 871     const H265RawSPS *sps = h265->active_sps;
 872     int err, i;
 873
 874     if (current->transform_skip_enabled_flag)
 875         ue(log2_max_transform_skip_block_size_minus2, 0, 3);
 876     flag(cross_component_prediction_enabled_flag);
 877
 878     flag(chroma_qp_offset_list_enabled_flag);
 879     if (current->chroma_qp_offset_list_enabled_flag) {
 880         ue(diff_cu_chroma_qp_offset_depth,
 881            0, sps->log2_diff_max_min_luma_coding_block_size);
 882         ue(chroma_qp_offset_list_len_minus1, 0, 5);
 883         for (i = 0; i <= current->chroma_qp_offset_list_len_minus1; i++) {
 884             se(cb_qp_offset_list[i], -12, +12);
 885             se(cr_qp_offset_list[i], -12, +12);
 886         }
 887     }
 888
 889     ue(log2_sao_offset_scale_luma,   0, FFMAX(0, sps->bit_depth_luma_minus8   - 2));
 890     ue(log2_sao_offset_scale_chroma, 0, FFMAX(0, sps->bit_depth_chroma_minus8 - 2));
 891
 892     return 0;
 893 }
 894
 895 static int FUNC(pps_scc_extension)(CodedBitstreamContext *ctx, RWContext *rw,
 896                                    H265RawPPS *current)
 897 {
 898     int err, comp, i;
 899
 900     flag(pps_curr_pic_ref_enabled_flag);
 901
 902     flag(residual_adaptive_colour_transform_enabled_flag);
 903     if (current->residual_adaptive_colour_transform_enabled_flag) {
 904         flag(pps_slice_act_qp_offsets_present_flag);
 905         se(pps_act_y_qp_offset_plus5,  -7, +17);
 906         se(pps_act_cb_qp_offset_plus5, -7, +17);
 907         se(pps_act_cr_qp_offset_plus3, -9, +15);
 908     } else {
 909         infer(pps_slice_act_qp_offsets_present_flag, 0);
 910         infer(pps_act_y_qp_offset_plus5,  0);
 911         infer(pps_act_cb_qp_offset_plus5, 0);
 912         infer(pps_act_cr_qp_offset_plus3, 0);
 913     }
 914
 915     flag(pps_palette_predictor_initializer_present_flag);
 916     if (current->pps_palette_predictor_initializer_present_flag) {
 917         ue(pps_num_palette_predictor_initializer, 0, 128);
 918         if (current->pps_num_palette_predictor_initializer > 0) {
 919             flag(monochrome_palette_flag);
 920             ue(luma_bit_depth_entry_minus8, 0, 8);
 921             if (!current->monochrome_palette_flag)
 922                 ue(chroma_bit_depth_entry_minus8, 0, 8);
 923             for (comp = 0; comp < (current->monochrome_palette_flag ? 1 : 3); comp++) {
 924                 int bit_depth = comp == 0 ? current->luma_bit_depth_entry_minus8 + 8
 925                                           : current->chroma_bit_depth_entry_minus8 + 8;
 926                 for (i = 0; i < current->pps_num_palette_predictor_initializer; i++)
 927                     u(bit_depth, pps_palette_predictor_initializers[comp][i],
 928                       0, (1 << bit_depth) - 1);
 929             }
 930         }
 931     }
 932
 933     return 0;
 934 }
 935
 936 static int FUNC(pps)(CodedBitstreamContext *ctx, RWContext *rw,
 937                      H265RawPPS *current)
 938 {
 939     CodedBitstreamH265Context *h265 = ctx->priv_data;
 940     const H265RawSPS *sps;
 941     int err, i;
 942
 943     HEADER("Picture Parameter Set");
 944
 945     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, HEVC_NAL_PPS));
 946
 947     ue(pps_pic_parameter_set_id, 0, 63);
 948     ue(pps_seq_parameter_set_id, 0, 15);
 949     sps = h265->sps[current->pps_seq_parameter_set_id];
 950     if (!sps) {
 951         av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",
 952                current->pps_seq_parameter_set_id);
 953         return AVERROR_INVALIDDATA;
 954     }
 955     h265->active_sps = sps;
 956
 957     flag(dependent_slice_segments_enabled_flag);
 958     flag(output_flag_present_flag);
 959     u(3, num_extra_slice_header_bits, 0, 7);
 960     flag(sign_data_hiding_enabled_flag);
 961     flag(cabac_init_present_flag);
 962
 963     ue(num_ref_idx_l0_default_active_minus1, 0, 14);
 964     ue(num_ref_idx_l1_default_active_minus1, 0, 14);
 965
 966     se(init_qp_minus26, -(26 + 6 * sps->bit_depth_luma_minus8), +25);
 967
 968     flag(constrained_intra_pred_flag);
 969     flag(transform_skip_enabled_flag);
 970     flag(cu_qp_delta_enabled_flag);
 971     if (current->cu_qp_delta_enabled_flag)
 972         ue(diff_cu_qp_delta_depth,
 973            0, sps->log2_diff_max_min_luma_coding_block_size);
 974     else
 975         infer(diff_cu_qp_delta_depth, 0);
 976
 977     se(pps_cb_qp_offset, -12, +12);
 978     se(pps_cr_qp_offset, -12, +12);
 979     flag(pps_slice_chroma_qp_offsets_present_flag);
 980
 981     flag(weighted_pred_flag);
 982     flag(weighted_bipred_flag);
 983
 984     flag(transquant_bypass_enabled_flag);
 985     flag(tiles_enabled_flag);
 986     flag(entropy_coding_sync_enabled_flag);
 987
 988     if (current->tiles_enabled_flag) {
 989         ue(num_tile_columns_minus1, 0, HEVC_MAX_TILE_COLUMNS);
 990         ue(num_tile_rows_minus1,    0, HEVC_MAX_TILE_ROWS);
 991         flag(uniform_spacing_flag);
 992         if (!current->uniform_spacing_flag) {
 993             for (i = 0; i < current->num_tile_columns_minus1; i++)
 994                 ue(column_width_minus1[i], 0, sps->pic_width_in_luma_samples);
 995             for (i = 0; i < current->num_tile_rows_minus1; i++)
 996                 ue(row_height_minus1[i],   0, sps->pic_height_in_luma_samples);
 997         }
 998         flag(loop_filter_across_tiles_enabled_flag);
 999     } else {
1000         infer(num_tile_columns_minus1, 0);
1001         infer(num_tile_rows_minus1,    0);
1002     }
1003
1004     flag(pps_loop_filter_across_slices_enabled_flag);
1005     flag(deblocking_filter_control_present_flag);
1006     if (current->deblocking_filter_control_present_flag) {
1007         flag(deblocking_filter_override_enabled_flag);
1008         flag(pps_deblocking_filter_disabled_flag);
1009         if (!current->pps_deblocking_filter_disabled_flag) {
1010             se(pps_beta_offset_div2, -6, +6);
1011             se(pps_tc_offset_div2,   -6, +6);
1012         } else {
1013             infer(pps_beta_offset_div2, 0);
1014             infer(pps_tc_offset_div2,   0);
1015         }
1016     } else {
1017         infer(deblocking_filter_override_enabled_flag, 0);
1018         infer(pps_deblocking_filter_disabled_flag,     0);
1019         infer(pps_beta_offset_div2, 0);
1020         infer(pps_tc_offset_div2,   0);
1021     }
1022
1023     flag(pps_scaling_list_data_present_flag);
1024     if (current->pps_scaling_list_data_present_flag)
1025         CHECK(FUNC(scaling_list_data)(ctx, rw, &current->scaling_list));
1026
1027     flag(lists_modification_present_flag);
1028
1029     ue(log2_parallel_merge_level_minus2,
1030        0, (sps->log2_min_luma_coding_block_size_minus3 + 3 +
1031            sps->log2_diff_max_min_luma_coding_block_size - 2));
1032
1033     flag(slice_segment_header_extension_present_flag);
1034
1035     flag(pps_extension_present_flag);
1036     if (current->pps_extension_present_flag) {
1037         flag(pps_range_extension_flag);
1038         flag(pps_multilayer_extension_flag);
1039         flag(pps_3d_extension_flag);
1040         flag(pps_scc_extension_flag);
1041         u(4, pps_extension_4bits, 0, (1 << 4) - 1);
1042     }
1043     if (current->pps_range_extension_flag)
1044         CHECK(FUNC(pps_range_extension)(ctx, rw, current));
1045     if (current->pps_multilayer_extension_flag)
1046         return AVERROR_PATCHWELCOME;
1047     if (current->pps_3d_extension_flag)
1048         return AVERROR_PATCHWELCOME;
1049     if (current->pps_scc_extension_flag)
1050         CHECK(FUNC(pps_scc_extension)(ctx, rw, current));
1051     if (current->pps_extension_4bits)
1052         CHECK(FUNC(extension_data)(ctx, rw, &current->extension_data));
1053
1054     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
1055
1056     return 0;
1057 }
1058
1059 static int FUNC(aud)(CodedBitstreamContext *ctx, RWContext *rw,
1060                      H265RawAUD *current)
1061 {
1062     int err;
1063
1064     HEADER("Access Unit Delimiter");
1065
1066     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, HEVC_NAL_AUD));
1067
1068     u(3, pic_type, 0, 2);
1069
1070     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
1071
1072     return 0;
1073 }
1074
1075 static int FUNC(ref_pic_lists_modification)(CodedBitstreamContext *ctx, RWContext *rw,
1076                                             H265RawSliceHeader *current,
1077                                             unsigned int num_pic_total_curr)
1078 {
1079     unsigned int entry_size;
1080     int err, i;
1081
1082     entry_size = av_log2(num_pic_total_curr - 1) + 1;
1083
1084     flag(ref_pic_list_modification_flag_l0);
1085     if (current->ref_pic_list_modification_flag_l0) {
1086         for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++)
1087             u(entry_size, list_entry_l0[i], 0, num_pic_total_curr - 1);
1088     }
1089
1090     if (current->slice_type == HEVC_SLICE_B) {
1091         flag(ref_pic_list_modification_flag_l1);
1092         if (current->ref_pic_list_modification_flag_l1) {
1093             for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++)
1094                 u(entry_size, list_entry_l1[i], 0, num_pic_total_curr - 1);
1095         }
1096     }
1097
1098     return 0;
1099 }
1100
1101 static int FUNC(pred_weight_table)(CodedBitstreamContext *ctx, RWContext *rw,
1102                                    H265RawSliceHeader *current)
1103 {
1104     CodedBitstreamH265Context *h265 = ctx->priv_data;
1105     const H265RawSPS *sps = h265->active_sps;
1106     int err, i, j;
1107     int chroma = !sps->separate_colour_plane_flag &&
1108                   sps->chroma_format_idc != 0;
1109
1110     ue(luma_log2_weight_denom, 0, 7);
1111     if (chroma)
1112         se(delta_chroma_log2_weight_denom, -7, 7);
1113     else
1114         infer(delta_chroma_log2_weight_denom, 0);
1115
1116     for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++) {
1117         if (1 /* is not same POC and same layer_id */)
1118             flag(luma_weight_l0_flag[i]);
1119         else
1120             infer(luma_weight_l0_flag[i], 0);
1121     }
1122     if (chroma) {
1123         for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++) {
1124             if (1 /* is not same POC and same layer_id */)
1125                 flag(chroma_weight_l0_flag[i]);
1126             else
1127                 infer(chroma_weight_l0_flag[i], 0);
1128         }
1129     }
1130
1131     for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++) {
1132         if (current->luma_weight_l0_flag[i]) {
1133             se(delta_luma_weight_l0[i], -128, +127);
1134             se(luma_offset_l0[i],
1135                -(1 << (sps->bit_depth_luma_minus8 + 8 - 1)),
1136                ((1 << (sps->bit_depth_luma_minus8 + 8 - 1)) - 1));
1137         } else {
1138             infer(delta_luma_weight_l0[i], 0);
1139             infer(luma_offset_l0[i],       0);
1140         }
1141         if (current->chroma_weight_l0_flag[i]) {
1142             for (j = 0; j < 2; j++) {
1143                 se(delta_chroma_weight_l0[i][j], -128, +127);
1144                 se(chroma_offset_l0[i][j],
1145                    -(4 << (sps->bit_depth_chroma_minus8 + 8 - 1)),
1146                    ((4 << (sps->bit_depth_chroma_minus8 + 8 - 1)) - 1));
1147             }
1148         } else {
1149             for (j = 0; j < 2; j++) {
1150                 infer(delta_chroma_weight_l0[i][j], 0);
1151                 infer(chroma_offset_l0[i][j],       0);
1152             }
1153         }
1154     }
1155
1156     if (current->slice_type == HEVC_SLICE_B) {
1157         for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++) {
1158             if (1 /* RefPicList1[i] is not CurrPic, nor is it in a different layer */)
1159                 flag(luma_weight_l1_flag[i]);
1160             else
1161                 infer(luma_weight_l1_flag[i], 0);
1162         }
1163         if (chroma) {
1164             for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++) {
1165                 if (1 /* RefPicList1[i] is not CurrPic, nor is it in a different layer */)
1166                     flag(chroma_weight_l1_flag[i]);
1167                 else
1168                     infer(chroma_weight_l1_flag[i], 0);
1169             }
1170         }
1171
1172         for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++) {
1173             if (current->luma_weight_l1_flag[i]) {
1174                 se(delta_luma_weight_l1[i], -128, +127);
1175                 se(luma_offset_l1[i],
1176                    -(1 << (sps->bit_depth_luma_minus8 + 8 - 1)),
1177                    ((1 << (sps->bit_depth_luma_minus8 + 8 - 1)) - 1));
1178             } else {
1179                 infer(delta_luma_weight_l1[i], 0);
1180                 infer(luma_offset_l1[i],       0);
1181             }
1182             if (current->chroma_weight_l1_flag[i]) {
1183                 for (j = 0; j < 2; j++) {
1184                     se(delta_chroma_weight_l1[i][j], -128, +127);
1185                     se(chroma_offset_l1[i][j],
1186                        -(4 << (sps->bit_depth_chroma_minus8 + 8 - 1)),
1187                        ((4 << (sps->bit_depth_chroma_minus8 + 8 - 1)) - 1));
1188                 }
1189             } else {
1190                 for (j = 0; j < 2; j++) {
1191                     infer(delta_chroma_weight_l1[i][j], 0);
1192                     infer(chroma_offset_l1[i][j],       0);
1193                 }
1194             }
1195         }
1196     }
1197
1198     return 0;
1199 }
1200
1201 static int FUNC(slice_segment_header)(CodedBitstreamContext *ctx, RWContext *rw,
1202                                       H265RawSliceHeader *current)
1203 {
1204     CodedBitstreamH265Context *h265 = ctx->priv_data;
1205     const H265RawSPS *sps;
1206     const H265RawPPS *pps;
1207     unsigned int min_cb_log2_size_y, ctb_log2_size_y, ctb_size_y;
1208     unsigned int pic_width_in_ctbs_y, pic_height_in_ctbs_y, pic_size_in_ctbs_y;
1209     unsigned int num_pic_total_curr = 0;
1210     int err, i;
1211
1212     HEADER("Slice Segment Header");
1213
1214     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, -1));
1215
1216     flag(first_slice_segment_in_pic_flag);
1217
1218     if (current->nal_unit_header.nal_unit_type >= HEVC_NAL_BLA_W_LP &&
1219         current->nal_unit_header.nal_unit_type <= HEVC_NAL_IRAP_VCL23)
1220         flag(no_output_of_prior_pics_flag);
1221
1222     ue(slice_pic_parameter_set_id, 0, 63);
1223
1224     pps = h265->pps[current->slice_pic_parameter_set_id];
1225     if (!pps) {
1226         av_log(ctx->log_ctx, AV_LOG_ERROR, "PPS id %d not available.\n",
1227                current->slice_pic_parameter_set_id);
1228         return AVERROR_INVALIDDATA;
1229     }
1230     h265->active_pps = pps;
1231
1232     sps = h265->sps[pps->pps_seq_parameter_set_id];
1233     if (!sps) {
1234         av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",
1235                pps->pps_seq_parameter_set_id);
1236         return AVERROR_INVALIDDATA;
1237     }
1238     h265->active_sps = sps;
1239
1240     min_cb_log2_size_y = sps->log2_min_luma_coding_block_size_minus3 + 3;
1241     ctb_log2_size_y = min_cb_log2_size_y + sps->log2_diff_max_min_luma_coding_block_size;
1242     ctb_size_y = 1 << ctb_log2_size_y;
1243     pic_width_in_ctbs_y =
1244         (sps->pic_width_in_luma_samples + ctb_size_y - 1) / ctb_size_y;
1245     pic_height_in_ctbs_y =
1246         (sps->pic_height_in_luma_samples + ctb_size_y - 1) / ctb_size_y;
1247     pic_size_in_ctbs_y = pic_width_in_ctbs_y * pic_height_in_ctbs_y;
1248
1249     if (!current->first_slice_segment_in_pic_flag) {
1250         unsigned int address_size = av_log2(pic_size_in_ctbs_y - 1) + 1;
1251         if (pps->dependent_slice_segments_enabled_flag)
1252             flag(dependent_slice_segment_flag);
1253         else
1254             infer(dependent_slice_segment_flag, 0);
1255         u(address_size, slice_segment_address, 0, pic_size_in_ctbs_y - 1);
1256     } else {
1257         infer(dependent_slice_segment_flag, 0);
1258     }
1259
1260     if (!current->dependent_slice_segment_flag) {
1261         for (i = 0; i < pps->num_extra_slice_header_bits; i++)
1262             flag(slice_reserved_flag[i]);
1263
1264         ue(slice_type, 0, 2);
1265
1266         if (pps->output_flag_present_flag)
1267             flag(pic_output_flag);
1268
1269         if (sps->separate_colour_plane_flag)
1270             u(2, colour_plane_id, 0, 2);
1271
1272         if (current->nal_unit_header.nal_unit_type != HEVC_NAL_IDR_W_RADL &&
1273             current->nal_unit_header.nal_unit_type != HEVC_NAL_IDR_N_LP) {
1274             const H265RawSTRefPicSet *rps;
1275
1276             u(sps->log2_max_pic_order_cnt_lsb_minus4 + 4, slice_pic_order_cnt_lsb,
1277               0, (1 << (sps->log2_max_pic_order_cnt_lsb_minus4 + 4)) - 1);
1278
1279             flag(short_term_ref_pic_set_sps_flag);
1280             if (!current->short_term_ref_pic_set_sps_flag) {
1281                 CHECK(FUNC(st_ref_pic_set)(ctx, rw, &current->short_term_ref_pic_set,
1282                                            sps->num_short_term_ref_pic_sets, sps));
1283                 rps = &current->short_term_ref_pic_set;
1284             } else if (sps->num_short_term_ref_pic_sets > 1) {
1285                 unsigned int idx_size = av_log2(sps->num_short_term_ref_pic_sets - 1) + 1;
1286                 u(idx_size, short_term_ref_pic_set_idx,
1287                   0, sps->num_short_term_ref_pic_sets - 1);
1288                 rps = &sps->st_ref_pic_set[current->short_term_ref_pic_set_idx];
1289             } else {
1290                 infer(short_term_ref_pic_set_idx, 0);
1291                 rps = &sps->st_ref_pic_set[0];
1292             }
1293
1294             num_pic_total_curr = 0;
1295             for (i = 0; i < rps->num_negative_pics; i++)
1296                 if (rps->used_by_curr_pic_s0_flag[i])
1297                     ++num_pic_total_curr;
1298             for (i = 0; i < rps->num_positive_pics; i++)
1299                 if (rps->used_by_curr_pic_s1_flag[i])
1300                     ++num_pic_total_curr;
1301
1302             if (sps->long_term_ref_pics_present_flag) {
1303                 unsigned int idx_size;
1304
1305                 if (sps->num_long_term_ref_pics_sps > 0) {
1306                     ue(num_long_term_sps, 0, sps->num_long_term_ref_pics_sps);
1307                     idx_size = av_log2(sps->num_long_term_ref_pics_sps - 1) + 1;
1308                 } else {
1309                     infer(num_long_term_sps, 0);
1310                     idx_size = 0;
1311                 }
1312                 ue(num_long_term_pics, 0, HEVC_MAX_LONG_TERM_REF_PICS);
1313
1314                 for (i = 0; i < current->num_long_term_sps +
1315                                 current->num_long_term_pics; i++) {
1316                     if (i < current->num_long_term_sps) {
1317                         if (sps->num_long_term_ref_pics_sps > 1)
1318                             u(idx_size, lt_idx_sps[i],
1319                               0, sps->num_long_term_ref_pics_sps - 1);
1320                         if (sps->used_by_curr_pic_lt_sps_flag[current->lt_idx_sps[i]])
1321                             ++num_pic_total_curr;
1322                     } else {
1323                         u(sps->log2_max_pic_order_cnt_lsb_minus4 + 4, poc_lsb_lt[i],
1324                           0, (1 << (sps->log2_max_pic_order_cnt_lsb_minus4 + 4)) - 1);
1325                         flag(used_by_curr_pic_lt_flag[i]);
1326                         if (current->used_by_curr_pic_lt_flag[i])
1327                             ++num_pic_total_curr;
1328                     }
1329                     flag(delta_poc_msb_present_flag[i]);
1330                     if (current->delta_poc_msb_present_flag[i])
1331                         ue(delta_poc_msb_cycle_lt[i], 0, UINT32_MAX - 1);
1332                     else
1333                         infer(delta_poc_msb_cycle_lt[i], 0);
1334                 }
1335             }
1336
1337             if (sps->sps_temporal_mvp_enabled_flag)
1338                 flag(slice_temporal_mvp_enabled_flag);
1339             else
1340                 infer(slice_temporal_mvp_enabled_flag, 0);
1341
1342             if (pps->pps_curr_pic_ref_enabled_flag)
1343                 ++num_pic_total_curr;
1344         }
1345
1346         if (sps->sample_adaptive_offset_enabled_flag) {
1347             flag(slice_sao_luma_flag);
1348             if (!sps->separate_colour_plane_flag && sps->chroma_format_idc != 0)
1349                 flag(slice_sao_chroma_flag);
1350             else
1351                 infer(slice_sao_chroma_flag, 0);
1352         } else {
1353             infer(slice_sao_luma_flag,   0);
1354             infer(slice_sao_chroma_flag, 0);
1355         }
1356
1357         if (current->slice_type == HEVC_SLICE_P ||
1358             current->slice_type == HEVC_SLICE_B) {
1359             flag(num_ref_idx_active_override_flag);
1360             if (current->num_ref_idx_active_override_flag) {
1361                 ue(num_ref_idx_l0_active_minus1, 0, 14);
1362                 if (current->slice_type == HEVC_SLICE_B)
1363                     ue(num_ref_idx_l1_active_minus1, 0, 14);
1364                 else
1365                     infer(num_ref_idx_l1_active_minus1, pps->num_ref_idx_l1_default_active_minus1);
1366             } else {
1367                 infer(num_ref_idx_l0_active_minus1, pps->num_ref_idx_l0_default_active_minus1);
1368                 infer(num_ref_idx_l1_active_minus1, pps->num_ref_idx_l1_default_active_minus1);
1369             }
1370
1371             if (pps->lists_modification_present_flag && num_pic_total_curr > 1)
1372                 CHECK(FUNC(ref_pic_lists_modification)(ctx, rw, current,
1373                                                        num_pic_total_curr));
1374
1375             if (current->slice_type == HEVC_SLICE_B)
1376                 flag(mvd_l1_zero_flag);
1377             if (pps->cabac_init_present_flag)
1378                 flag(cabac_init_flag);
1379             else
1380                 infer(cabac_init_flag, 0);
1381             if (current->slice_temporal_mvp_enabled_flag) {
1382                 if (current->slice_type == HEVC_SLICE_B)
1383                     flag(collocated_from_l0_flag);
1384                 else
1385                     infer(collocated_from_l0_flag, 1);
1386                 if (current->collocated_from_l0_flag) {
1387                     if (current->num_ref_idx_l0_active_minus1 > 0)
1388                         ue(collocated_ref_idx, 0, current->num_ref_idx_l0_active_minus1);
1389                     else
1390                         infer(collocated_ref_idx, 0);
1391                 } else {
1392                     if (current->num_ref_idx_l1_active_minus1 > 0)
1393                         ue(collocated_ref_idx, 0, current->num_ref_idx_l1_active_minus1);
1394                     else
1395                         infer(collocated_ref_idx, 0);
1396                 }
1397             }
1398
1399             if ((pps->weighted_pred_flag   && current->slice_type == HEVC_SLICE_P) ||
1400                 (pps->weighted_bipred_flag && current->slice_type == HEVC_SLICE_B))
1401                 CHECK(FUNC(pred_weight_table)(ctx, rw, current));
1402
1403             ue(five_minus_max_num_merge_cand, 0, 4);
1404             if (sps->motion_vector_resolution_control_idc == 2)
1405                 flag(use_integer_mv_flag);
1406             else
1407                 infer(use_integer_mv_flag, sps->motion_vector_resolution_control_idc);
1408         }
1409
1410         se(slice_qp_delta,
1411            - 6 * sps->bit_depth_luma_minus8 - (pps->init_qp_minus26 + 26),
1412            + 51 - (pps->init_qp_minus26 + 26));
1413         if (pps->pps_slice_chroma_qp_offsets_present_flag) {
1414             se(slice_cb_qp_offset, -12, +12);
1415             se(slice_cr_qp_offset, -12, +12);
1416         } else {
1417             infer(slice_cb_qp_offset, 0);
1418             infer(slice_cr_qp_offset, 0);
1419         }
1420         if (pps->pps_slice_act_qp_offsets_present_flag) {
1421             se(slice_act_y_qp_offset,
1422                -12 - (pps->pps_act_y_qp_offset_plus5 - 5),
1423                +12 - (pps->pps_act_y_qp_offset_plus5 - 5));
1424             se(slice_act_cb_qp_offset,
1425                -12 - (pps->pps_act_cb_qp_offset_plus5 - 5),
1426                +12 - (pps->pps_act_cb_qp_offset_plus5 - 5));
1427             se(slice_act_cr_qp_offset,
1428                -12 - (pps->pps_act_cr_qp_offset_plus3 - 3),
1429                +12 - (pps->pps_act_cr_qp_offset_plus3 - 3));
1430         } else {
1431             infer(slice_act_y_qp_offset,  0);
1432             infer(slice_act_cb_qp_offset, 0);
1433             infer(slice_act_cr_qp_offset, 0);
1434         }
1435         if (pps->chroma_qp_offset_list_enabled_flag)
1436             flag(cu_chroma_qp_offset_enabled_flag);
1437         else
1438             infer(cu_chroma_qp_offset_enabled_flag, 0);
1439
1440         if (pps->deblocking_filter_override_enabled_flag)
1441             flag(deblocking_filter_override_flag);
1442         else
1443             infer(deblocking_filter_override_flag, 0);
1444         if (current->deblocking_filter_override_flag) {
1445             flag(slice_deblocking_filter_disabled_flag);
1446             if (!current->slice_deblocking_filter_disabled_flag) {
1447                 se(slice_beta_offset_div2, -6, +6);
1448                 se(slice_tc_offset_div2,   -6, +6);
1449             } else {
1450                 infer(slice_beta_offset_div2, pps->pps_beta_offset_div2);
1451                 infer(slice_tc_offset_div2,   pps->pps_tc_offset_div2);
1452             }
1453         } else {
1454             infer(slice_deblocking_filter_disabled_flag,
1455                   pps->pps_deblocking_filter_disabled_flag);
1456             infer(slice_beta_offset_div2, pps->pps_beta_offset_div2);
1457             infer(slice_tc_offset_div2,   pps->pps_tc_offset_div2);
1458         }
1459         if (pps->pps_loop_filter_across_slices_enabled_flag &&
1460             (current->slice_sao_luma_flag || current->slice_sao_chroma_flag ||
1461              !current->slice_deblocking_filter_disabled_flag))
1462             flag(slice_loop_filter_across_slices_enabled_flag);
1463         else
1464             infer(slice_loop_filter_across_slices_enabled_flag,
1465                   pps->pps_loop_filter_across_slices_enabled_flag);
1466     }
1467
1468     if (pps->tiles_enabled_flag || pps->entropy_coding_sync_enabled_flag) {
1469         unsigned int num_entry_point_offsets_limit;
1470         if (!pps->tiles_enabled_flag && pps->entropy_coding_sync_enabled_flag)
1471             num_entry_point_offsets_limit = pic_height_in_ctbs_y - 1;
1472         else if (pps->tiles_enabled_flag && !pps->entropy_coding_sync_enabled_flag)
1473             num_entry_point_offsets_limit =
1474                 (pps->num_tile_columns_minus1 + 1) * (pps->num_tile_rows_minus1 + 1);
1475         else
1476             num_entry_point_offsets_limit =
1477                 (pps->num_tile_columns_minus1 + 1) * pic_height_in_ctbs_y - 1;
1478         ue(num_entry_point_offsets, 0, num_entry_point_offsets_limit);
1479
1480         if (current->num_entry_point_offsets > HEVC_MAX_ENTRY_POINT_OFFSETS) {
1481             av_log(ctx->log_ctx, AV_LOG_ERROR, "Too many entry points: "
1482                    "%"PRIu16".\n", current->num_entry_point_offsets);
1483             return AVERROR_PATCHWELCOME;
1484         }
1485
1486         if (current->num_entry_point_offsets > 0) {
1487             ue(offset_len_minus1, 0, 31);
1488             for (i = 0; i < current->num_entry_point_offsets; i++)
1489                 u(current->offset_len_minus1 + 1, entry_point_offset_minus1[i],
1490                   0, (1 << (current->offset_len_minus1 + 1)) - 1);
1491         }
1492     }
1493
1494     if (pps->slice_segment_header_extension_present_flag) {
1495         ue(slice_segment_header_extension_length, 0, 256);
1496         for (i = 0; i < current->slice_segment_header_extension_length; i++)
1497             u(8, slice_segment_header_extension_data_byte[i], 0x00, 0xff);
1498     }
1499
1500     CHECK(FUNC(byte_alignment)(ctx, rw));
1501
1502     return 0;
1503 }