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
  23     fixed(1, rbsp_stop_one_bit, 1);
  24     while (byte_alignment(rw) != 0)
  25         fixed(1, rbsp_alignment_zero_bit, 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     fixed(1, forbidden_zero_bit, 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         ub(6, nal_unit_type);
  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
  54     fixed(1, alignment_bit_equal_to_one, 1);
  55     while (byte_alignment(rw) != 0)
  56         fixed(1, alignment_bit_equal_to_zero, 0);
  57
  58     return 0;
  59 }
  60
  61 static int FUNC(extension_data)(CodedBitstreamContext *ctx, RWContext *rw,
  62                                 H265RawExtensionData *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, 0);
  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) & 1, 0, 1, 0);
  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     int err, i, j;
  94
  95     if (profile_present_flag) {
  96         u(2, general_profile_space, 0, 0);
  97         flag(general_tier_flag);
  98         ub(5, general_profile_idc);
  99
 100         for (j = 0; j < 32; j++)
 101             flags(general_profile_compatibility_flag[j], 1, j);
 102
 103         flag(general_progressive_source_flag);
 104         flag(general_interlaced_source_flag);
 105         flag(general_non_packed_constraint_flag);
 106         flag(general_frame_only_constraint_flag);
 107
 108 #define profile_compatible(x) (current->general_profile_idc == (x) || \
 109                                current->general_profile_compatibility_flag[x])
 110         if (profile_compatible(4) || profile_compatible(5) ||
 111             profile_compatible(6) || profile_compatible(7) ||
 112             profile_compatible(8) || profile_compatible(9) ||
 113             profile_compatible(10)) {
 114             flag(general_max_12bit_constraint_flag);
 115             flag(general_max_10bit_constraint_flag);
 116             flag(general_max_8bit_constraint_flag);
 117             flag(general_max_422chroma_constraint_flag);
 118             flag(general_max_420chroma_constraint_flag);
 119             flag(general_max_monochrome_constraint_flag);
 120             flag(general_intra_constraint_flag);
 121             flag(general_one_picture_only_constraint_flag);
 122             flag(general_lower_bit_rate_constraint_flag);
 123
 124             if (profile_compatible(5) || profile_compatible(9) ||
 125                 profile_compatible(10)) {
 126                 flag(general_max_14bit_constraint_flag);
 127                 fixed(24, general_reserved_zero_33bits, 0);
 128                 fixed( 9, general_reserved_zero_33bits, 0);
 129             } else {
 130                 fixed(24, general_reserved_zero_34bits, 0);
 131                 fixed(10, general_reserved_zero_34bits, 0);
 132             }
 133         } else if (profile_compatible(2)) {
 134             fixed(7, general_reserved_zero_7bits, 0);
 135             flag(general_one_picture_only_constraint_flag);
 136             fixed(24, general_reserved_zero_35bits, 0);
 137             fixed(11, general_reserved_zero_35bits, 0);
 138         } else {
 139             fixed(24, general_reserved_zero_43bits, 0);
 140             fixed(19, general_reserved_zero_43bits, 0);
 141         }
 142
 143         if (profile_compatible(1) || profile_compatible(2) ||
 144             profile_compatible(3) || profile_compatible(4) ||
 145             profile_compatible(5) || profile_compatible(9)) {
 146             flag(general_inbld_flag);
 147         } else {
 148             fixed(1, general_reserved_zero_bit, 0);
 149         }
 150 #undef profile_compatible
 151     }
 152
 153     ub(8, general_level_idc);
 154
 155     for (i = 0; i < max_num_sub_layers_minus1; i++) {
 156         flags(sub_layer_profile_present_flag[i], 1, i);
 157         flags(sub_layer_level_present_flag[i],   1, i);
 158     }
 159
 160     if (max_num_sub_layers_minus1 > 0) {
 161         for (i = max_num_sub_layers_minus1; i < 8; i++)
 162             fixed(2, reserved_zero_2bits, 0);
 163     }
 164
 165     for (i = 0; i < max_num_sub_layers_minus1; i++) {
 166         if (current->sub_layer_profile_present_flag[i]) {
 167             us(2, sub_layer_profile_space[i], 0, 0, 1, i);
 168             flags(sub_layer_tier_flag[i],           1, i);
 169             ubs(5, sub_layer_profile_idc[i], 1, i);
 170
 171             for (j = 0; j < 32; j++)
 172                 flags(sub_layer_profile_compatibility_flag[i][j], 2, i, j);
 173
 174             flags(sub_layer_progressive_source_flag[i],    1, i);
 175             flags(sub_layer_interlaced_source_flag[i],     1, i);
 176             flags(sub_layer_non_packed_constraint_flag[i], 1, i);
 177             flags(sub_layer_frame_only_constraint_flag[i], 1, i);
 178
 179 #define profile_compatible(x) (current->sub_layer_profile_idc[i] == (x) ||   \
 180                                current->sub_layer_profile_compatibility_flag[i][x])
 181             if (profile_compatible(4) || profile_compatible(5) ||
 182                 profile_compatible(6) || profile_compatible(7) ||
 183                 profile_compatible(8) || profile_compatible(9) ||
 184                 profile_compatible(10)) {
 185                 flags(sub_layer_max_12bit_constraint_flag[i],        1, i);
 186                 flags(sub_layer_max_10bit_constraint_flag[i],        1, i);
 187                 flags(sub_layer_max_8bit_constraint_flag[i],         1, i);
 188                 flags(sub_layer_max_422chroma_constraint_flag[i],    1, i);
 189                 flags(sub_layer_max_420chroma_constraint_flag[i],    1, i);
 190                 flags(sub_layer_max_monochrome_constraint_flag[i],   1, i);
 191                 flags(sub_layer_intra_constraint_flag[i],            1, i);
 192                 flags(sub_layer_one_picture_only_constraint_flag[i], 1, i);
 193                 flags(sub_layer_lower_bit_rate_constraint_flag[i],   1, i);
 194
 195                 if (profile_compatible(5)) {
 196                     flags(sub_layer_max_14bit_constraint_flag[i], 1, i);
 197                     fixed(24, sub_layer_reserved_zero_33bits, 0);
 198                     fixed( 9, sub_layer_reserved_zero_33bits, 0);
 199                 } else {
 200                     fixed(24, sub_layer_reserved_zero_34bits, 0);
 201                     fixed(10, sub_layer_reserved_zero_34bits, 0);
 202                 }
 203             } else if (profile_compatible(2)) {
 204                 fixed(7, sub_layer_reserved_zero_7bits, 0);
 205                 flags(sub_layer_one_picture_only_constraint_flag[i], 1, i);
 206                 fixed(24, sub_layer_reserved_zero_43bits, 0);
 207                 fixed(11, sub_layer_reserved_zero_43bits, 0);
 208             } else {
 209                 fixed(24, sub_layer_reserved_zero_43bits, 0);
 210                 fixed(19, sub_layer_reserved_zero_43bits, 0);
 211             }
 212
 213             if (profile_compatible(1) || profile_compatible(2) ||
 214                 profile_compatible(3) || profile_compatible(4) ||
 215                 profile_compatible(5) || profile_compatible(9)) {
 216                 flags(sub_layer_inbld_flag[i], 1, i);
 217             } else {
 218                 fixed(1, sub_layer_reserved_zero_bit, 0);
 219             }
 220 #undef profile_compatible
 221         }
 222         if (current->sub_layer_level_present_flag[i])
 223             ubs(8, sub_layer_level_idc[i], 1, i);
 224     }
 225
 226     return 0;
 227 }
 228
 229 static int FUNC(sub_layer_hrd_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
 230                                           H265RawHRDParameters *hrd,
 231                                           int nal, int sub_layer_id)
 232 {
 233     H265RawSubLayerHRDParameters *current;
 234     int err, i;
 235
 236     if (nal)
 237         current = &hrd->nal_sub_layer_hrd_parameters[sub_layer_id];
 238     else
 239         current = &hrd->vcl_sub_layer_hrd_parameters[sub_layer_id];
 240
 241     for (i = 0; i <= hrd->cpb_cnt_minus1[sub_layer_id]; i++) {
 242         ues(bit_rate_value_minus1[i], 0, UINT32_MAX - 1, 1, i);
 243         ues(cpb_size_value_minus1[i], 0, UINT32_MAX - 1, 1, i);
 244         if (hrd->sub_pic_hrd_params_present_flag) {
 245             ues(cpb_size_du_value_minus1[i], 0, UINT32_MAX - 1, 1, i);
 246             ues(bit_rate_du_value_minus1[i], 0, UINT32_MAX - 1, 1, i);
 247         }
 248         flags(cbr_flag[i], 1, i);
 249     }
 250
 251     return 0;
 252 }
 253
 254 static int FUNC(hrd_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
 255                                 H265RawHRDParameters *current, int common_inf_present_flag,
 256                                 int max_num_sub_layers_minus1)
 257 {
 258     int err, i;
 259
 260     if (common_inf_present_flag) {
 261         flag(nal_hrd_parameters_present_flag);
 262         flag(vcl_hrd_parameters_present_flag);
 263
 264         if (current->nal_hrd_parameters_present_flag ||
 265             current->vcl_hrd_parameters_present_flag) {
 266             flag(sub_pic_hrd_params_present_flag);
 267             if (current->sub_pic_hrd_params_present_flag) {
 268                 ub(8, tick_divisor_minus2);
 269                 ub(5, du_cpb_removal_delay_increment_length_minus1);
 270                 flag(sub_pic_cpb_params_in_pic_timing_sei_flag);
 271                 ub(5, dpb_output_delay_du_length_minus1);
 272             }
 273
 274             ub(4, bit_rate_scale);
 275             ub(4, cpb_size_scale);
 276             if (current->sub_pic_hrd_params_present_flag)
 277                 ub(4, cpb_size_du_scale);
 278
 279             ub(5, initial_cpb_removal_delay_length_minus1);
 280             ub(5, au_cpb_removal_delay_length_minus1);
 281             ub(5, dpb_output_delay_length_minus1);
 282         } else {
 283             infer(sub_pic_hrd_params_present_flag, 0);
 284
 285             infer(initial_cpb_removal_delay_length_minus1, 23);
 286             infer(au_cpb_removal_delay_length_minus1,      23);
 287             infer(dpb_output_delay_length_minus1,          23);
 288         }
 289     }
 290
 291     for (i = 0; i <= max_num_sub_layers_minus1; i++) {
 292         flags(fixed_pic_rate_general_flag[i], 1, i);
 293
 294         if (!current->fixed_pic_rate_general_flag[i])
 295             flags(fixed_pic_rate_within_cvs_flag[i], 1, i);
 296         else
 297             infer(fixed_pic_rate_within_cvs_flag[i], 1);
 298
 299         if (current->fixed_pic_rate_within_cvs_flag[i]) {
 300             ues(elemental_duration_in_tc_minus1[i], 0, 2047, 1, i);
 301             infer(low_delay_hrd_flag[i], 0);
 302         } else
 303             flags(low_delay_hrd_flag[i], 1, i);
 304
 305         if (!current->low_delay_hrd_flag[i])
 306             ues(cpb_cnt_minus1[i], 0, 31, 1, i);
 307         else
 308             infer(cpb_cnt_minus1[i], 0);
 309
 310         if (current->nal_hrd_parameters_present_flag)
 311             CHECK(FUNC(sub_layer_hrd_parameters)(ctx, rw, current, 0, i));
 312         if (current->vcl_hrd_parameters_present_flag)
 313             CHECK(FUNC(sub_layer_hrd_parameters)(ctx, rw, current, 1, i));
 314     }
 315
 316     return 0;
 317 }
 318
 319 static int FUNC(vui_parameters)(CodedBitstreamContext *ctx, RWContext *rw,
 320                                 H265RawVUI *current, const H265RawSPS *sps)
 321 {
 322     int err;
 323
 324     flag(aspect_ratio_info_present_flag);
 325     if (current->aspect_ratio_info_present_flag) {
 326         ub(8, aspect_ratio_idc);
 327         if (current->aspect_ratio_idc == 255) {
 328             ub(16, sar_width);
 329             ub(16, sar_height);
 330         }
 331     } else {
 332         infer(aspect_ratio_idc, 0);
 333     }
 334
 335     flag(overscan_info_present_flag);
 336     if (current->overscan_info_present_flag)
 337         flag(overscan_appropriate_flag);
 338
 339     flag(video_signal_type_present_flag);
 340     if (current->video_signal_type_present_flag) {
 341         ub(3, video_format);
 342         flag(video_full_range_flag);
 343         flag(colour_description_present_flag);
 344         if (current->colour_description_present_flag) {
 345             ub(8, colour_primaries);
 346             ub(8, transfer_characteristics);
 347             ub(8, matrix_coefficients);
 348         } else {
 349             infer(colour_primaries,         2);
 350             infer(transfer_characteristics, 2);
 351             infer(matrix_coefficients,      2);
 352         }
 353     } else {
 354         infer(video_format,             5);
 355         infer(video_full_range_flag,    0);
 356         infer(colour_primaries,         2);
 357         infer(transfer_characteristics, 2);
 358         infer(matrix_coefficients,      2);
 359     }
 360
 361     flag(chroma_loc_info_present_flag);
 362     if (current->chroma_loc_info_present_flag) {
 363         ue(chroma_sample_loc_type_top_field,    0, 5);
 364         ue(chroma_sample_loc_type_bottom_field, 0, 5);
 365     } else {
 366         infer(chroma_sample_loc_type_top_field,    0);
 367         infer(chroma_sample_loc_type_bottom_field, 0);
 368     }
 369
 370     flag(neutral_chroma_indication_flag);
 371     flag(field_seq_flag);
 372     flag(frame_field_info_present_flag);
 373
 374     flag(default_display_window_flag);
 375     if (current->default_display_window_flag) {
 376         ue(def_disp_win_left_offset,   0, 16384);
 377         ue(def_disp_win_right_offset,  0, 16384);
 378         ue(def_disp_win_top_offset,    0, 16384);
 379         ue(def_disp_win_bottom_offset, 0, 16384);
 380     }
 381
 382     flag(vui_timing_info_present_flag);
 383     if (current->vui_timing_info_present_flag) {
 384         u(32, vui_num_units_in_tick, 1, UINT32_MAX);
 385         u(32, vui_time_scale,        1, UINT32_MAX);
 386         flag(vui_poc_proportional_to_timing_flag);
 387         if (current->vui_poc_proportional_to_timing_flag)
 388             ue(vui_num_ticks_poc_diff_one_minus1, 0, UINT32_MAX - 1);
 389
 390         flag(vui_hrd_parameters_present_flag);
 391         if (current->vui_hrd_parameters_present_flag) {
 392             CHECK(FUNC(hrd_parameters)(ctx, rw, &current->hrd_parameters,
 393                                        1, sps->sps_max_sub_layers_minus1));
 394         }
 395     }
 396
 397     flag(bitstream_restriction_flag);
 398     if (current->bitstream_restriction_flag) {
 399         flag(tiles_fixed_structure_flag);
 400         flag(motion_vectors_over_pic_boundaries_flag);
 401         flag(restricted_ref_pic_lists_flag);
 402         ue(min_spatial_segmentation_idc,  0, 4095);
 403         ue(max_bytes_per_pic_denom,       0, 16);
 404         ue(max_bits_per_min_cu_denom,     0, 16);
 405         ue(log2_max_mv_length_horizontal, 0, 16);
 406         ue(log2_max_mv_length_vertical,   0, 16);
 407     } else {
 408         infer(tiles_fixed_structure_flag,    0);
 409         infer(motion_vectors_over_pic_boundaries_flag, 1);
 410         infer(min_spatial_segmentation_idc,  0);
 411         infer(max_bytes_per_pic_denom,       2);
 412         infer(max_bits_per_min_cu_denom,     1);
 413         infer(log2_max_mv_length_horizontal, 15);
 414         infer(log2_max_mv_length_vertical,   15);
 415     }
 416
 417     return 0;
 418 }
 419
 420 static int FUNC(vps)(CodedBitstreamContext *ctx, RWContext *rw,
 421                      H265RawVPS *current)
 422 {
 423     int err, i, j;
 424
 425     HEADER("Video Parameter Set");
 426
 427     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, HEVC_NAL_VPS));
 428
 429     ub(4, vps_video_parameter_set_id);
 430
 431     flag(vps_base_layer_internal_flag);
 432     flag(vps_base_layer_available_flag);
 433     u(6, vps_max_layers_minus1,     0, HEVC_MAX_LAYERS - 1);
 434     u(3, vps_max_sub_layers_minus1, 0, HEVC_MAX_SUB_LAYERS - 1);
 435     flag(vps_temporal_id_nesting_flag);
 436
 437     if (current->vps_max_sub_layers_minus1 == 0 &&
 438         current->vps_temporal_id_nesting_flag != 1) {
 439         av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid stream: "
 440                "vps_temporal_id_nesting_flag must be 1 if "
 441                "vps_max_sub_layers_minus1 is 0.\n");
 442         return AVERROR_INVALIDDATA;
 443     }
 444
 445     fixed(16, vps_reserved_0xffff_16bits, 0xffff);
 446
 447     CHECK(FUNC(profile_tier_level)(ctx, rw, &current->profile_tier_level,
 448                                    1, current->vps_max_sub_layers_minus1));
 449
 450     flag(vps_sub_layer_ordering_info_present_flag);
 451     for (i = (current->vps_sub_layer_ordering_info_present_flag ?
 452               0 : current->vps_max_sub_layers_minus1);
 453          i <= current->vps_max_sub_layers_minus1; i++) {
 454         ues(vps_max_dec_pic_buffering_minus1[i],
 455             0, HEVC_MAX_DPB_SIZE - 1,                        1, i);
 456         ues(vps_max_num_reorder_pics[i],
 457             0, current->vps_max_dec_pic_buffering_minus1[i], 1, i);
 458         ues(vps_max_latency_increase_plus1[i],
 459             0, UINT32_MAX - 1,                               1, i);
 460     }
 461     if (!current->vps_sub_layer_ordering_info_present_flag) {
 462         for (i = 0; i < current->vps_max_sub_layers_minus1; i++) {
 463             infer(vps_max_dec_pic_buffering_minus1[i],
 464                   current->vps_max_dec_pic_buffering_minus1[current->vps_max_sub_layers_minus1]);
 465             infer(vps_max_num_reorder_pics[i],
 466                   current->vps_max_num_reorder_pics[current->vps_max_sub_layers_minus1]);
 467             infer(vps_max_latency_increase_plus1[i],
 468                   current->vps_max_latency_increase_plus1[current->vps_max_sub_layers_minus1]);
 469         }
 470     }
 471
 472     u(6, vps_max_layer_id,        0, HEVC_MAX_LAYERS - 1);
 473     ue(vps_num_layer_sets_minus1, 0, HEVC_MAX_LAYER_SETS - 1);
 474     for (i = 1; i <= current->vps_num_layer_sets_minus1; i++) {
 475         for (j = 0; j <= current->vps_max_layer_id; j++)
 476             flags(layer_id_included_flag[i][j], 2, i, j);
 477     }
 478     for (j = 0; j <= current->vps_max_layer_id; j++)
 479         infer(layer_id_included_flag[0][j], j == 0);
 480
 481     flag(vps_timing_info_present_flag);
 482     if (current->vps_timing_info_present_flag) {
 483         u(32, vps_num_units_in_tick, 1, UINT32_MAX);
 484         u(32, vps_time_scale,        1, UINT32_MAX);
 485         flag(vps_poc_proportional_to_timing_flag);
 486         if (current->vps_poc_proportional_to_timing_flag)
 487             ue(vps_num_ticks_poc_diff_one_minus1, 0, UINT32_MAX - 1);
 488         ue(vps_num_hrd_parameters, 0, current->vps_num_layer_sets_minus1 + 1);
 489         for (i = 0; i < current->vps_num_hrd_parameters; i++) {
 490             ues(hrd_layer_set_idx[i],
 491                 current->vps_base_layer_internal_flag ? 0 : 1,
 492                 current->vps_num_layer_sets_minus1, 1, i);
 493             if (i > 0)
 494                 flags(cprms_present_flag[i], 1, i);
 495             else
 496                 infer(cprms_present_flag[0], 1);
 497
 498             CHECK(FUNC(hrd_parameters)(ctx, rw, &current->hrd_parameters[i],
 499                                        current->cprms_present_flag[i],
 500                                        current->vps_max_sub_layers_minus1));
 501         }
 502     }
 503
 504     flag(vps_extension_flag);
 505     if (current->vps_extension_flag)
 506         CHECK(FUNC(extension_data)(ctx, rw, &current->extension_data));
 507
 508     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
 509
 510     return 0;
 511 }
 512
 513 static int FUNC(st_ref_pic_set)(CodedBitstreamContext *ctx, RWContext *rw,
 514                                 H265RawSTRefPicSet *current, int st_rps_idx,
 515                                 const H265RawSPS *sps)
 516 {
 517     int err, i, j;
 518
 519     if (st_rps_idx != 0)
 520         flag(inter_ref_pic_set_prediction_flag);
 521     else
 522         infer(inter_ref_pic_set_prediction_flag, 0);
 523
 524     if (current->inter_ref_pic_set_prediction_flag) {
 525         unsigned int ref_rps_idx, num_delta_pocs, num_ref_pics;
 526         const H265RawSTRefPicSet *ref;
 527         int delta_rps, d_poc;
 528         int ref_delta_poc_s0[HEVC_MAX_REFS], ref_delta_poc_s1[HEVC_MAX_REFS];
 529         int delta_poc_s0[HEVC_MAX_REFS], delta_poc_s1[HEVC_MAX_REFS];
 530         uint8_t used_by_curr_pic_s0[HEVC_MAX_REFS],
 531                 used_by_curr_pic_s1[HEVC_MAX_REFS];
 532
 533         if (st_rps_idx == sps->num_short_term_ref_pic_sets)
 534             ue(delta_idx_minus1, 0, st_rps_idx - 1);
 535         else
 536             infer(delta_idx_minus1, 0);
 537
 538         ref_rps_idx = st_rps_idx - (current->delta_idx_minus1 + 1);
 539         ref = &sps->st_ref_pic_set[ref_rps_idx];
 540         num_delta_pocs = ref->num_negative_pics + ref->num_positive_pics;
 541         av_assert0(num_delta_pocs < HEVC_MAX_DPB_SIZE);
 542
 543         flag(delta_rps_sign);
 544         ue(abs_delta_rps_minus1, 0, INT16_MAX);
 545         delta_rps = (1 - 2 * current->delta_rps_sign) *
 546             (current->abs_delta_rps_minus1 + 1);
 547
 548         num_ref_pics = 0;
 549         for (j = 0; j <= num_delta_pocs; j++) {
 550             flags(used_by_curr_pic_flag[j], 1, j);
 551             if (!current->used_by_curr_pic_flag[j])
 552                 flags(use_delta_flag[j], 1, j);
 553             else
 554                 infer(use_delta_flag[j], 1);
 555             if (current->use_delta_flag[j])
 556                 ++num_ref_pics;
 557         }
 558         if (num_ref_pics >= HEVC_MAX_DPB_SIZE) {
 559             av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid stream: "
 560                    "short-term ref pic set %d "
 561                    "contains too many pictures.\n", st_rps_idx);
 562             return AVERROR_INVALIDDATA;
 563         }
 564
 565         // Since the stored form of an RPS here is actually the delta-step
 566         // form used when inter_ref_pic_set_prediction_flag is not set, we
 567         // need to reconstruct that here in order to be able to refer to
 568         // the RPS later (which is required for parsing, because we don't
 569         // even know what syntax elements appear without it).  Therefore,
 570         // this code takes the delta-step form of the reference set, turns
 571         // it into the delta-array form, applies the prediction process of
 572         // 7.4.8, converts the result back to the delta-step form, and
 573         // stores that as the current set for future use.  Note that the
 574         // inferences here mean that writers using prediction will need
 575         // to fill in the delta-step values correctly as well - since the
 576         // whole RPS prediction process is somewhat overly sophisticated,
 577         // this hopefully forms a useful check for them to ensure their
 578         // predicted form actually matches what was intended rather than
 579         // an onerous additional requirement.
 580
 581         d_poc = 0;
 582         for (i = 0; i < ref->num_negative_pics; i++) {
 583             d_poc -= ref->delta_poc_s0_minus1[i] + 1;
 584             ref_delta_poc_s0[i] = d_poc;
 585         }
 586         d_poc = 0;
 587         for (i = 0; i < ref->num_positive_pics; i++) {
 588             d_poc += ref->delta_poc_s1_minus1[i] + 1;
 589             ref_delta_poc_s1[i] = d_poc;
 590         }
 591
 592         i = 0;
 593         for (j = ref->num_positive_pics - 1; j >= 0; j--) {
 594             d_poc = ref_delta_poc_s1[j] + delta_rps;
 595             if (d_poc < 0 && current->use_delta_flag[ref->num_negative_pics + j]) {
 596                 delta_poc_s0[i] = d_poc;
 597                 used_by_curr_pic_s0[i++] =
 598                     current->used_by_curr_pic_flag[ref->num_negative_pics + j];
 599             }
 600         }
 601         if (delta_rps < 0 && current->use_delta_flag[num_delta_pocs]) {
 602             delta_poc_s0[i] = delta_rps;
 603             used_by_curr_pic_s0[i++] =
 604                 current->used_by_curr_pic_flag[num_delta_pocs];
 605         }
 606         for (j = 0; j < ref->num_negative_pics; j++) {
 607             d_poc = ref_delta_poc_s0[j] + delta_rps;
 608             if (d_poc < 0 && current->use_delta_flag[j]) {
 609                 delta_poc_s0[i] = d_poc;
 610                 used_by_curr_pic_s0[i++] = current->used_by_curr_pic_flag[j];
 611             }
 612         }
 613
 614         infer(num_negative_pics, i);
 615         for (i = 0; i < current->num_negative_pics; i++) {
 616             infer(delta_poc_s0_minus1[i],
 617                   -(delta_poc_s0[i] - (i == 0 ? 0 : delta_poc_s0[i - 1])) - 1);
 618             infer(used_by_curr_pic_s0_flag[i], used_by_curr_pic_s0[i]);
 619         }
 620
 621         i = 0;
 622         for (j = ref->num_negative_pics - 1; j >= 0; j--) {
 623             d_poc = ref_delta_poc_s0[j] + delta_rps;
 624             if (d_poc > 0 && current->use_delta_flag[j]) {
 625                 delta_poc_s1[i] = d_poc;
 626                 used_by_curr_pic_s1[i++] = current->used_by_curr_pic_flag[j];
 627             }
 628         }
 629         if (delta_rps > 0 && current->use_delta_flag[num_delta_pocs]) {
 630             delta_poc_s1[i] = delta_rps;
 631             used_by_curr_pic_s1[i++] =
 632                 current->used_by_curr_pic_flag[num_delta_pocs];
 633         }
 634         for (j = 0; j < ref->num_positive_pics; j++) {
 635             d_poc = ref_delta_poc_s1[j] + delta_rps;
 636             if (d_poc > 0 && current->use_delta_flag[ref->num_negative_pics + j]) {
 637                 delta_poc_s1[i] = d_poc;
 638                 used_by_curr_pic_s1[i++] =
 639                     current->used_by_curr_pic_flag[ref->num_negative_pics + j];
 640             }
 641         }
 642
 643         infer(num_positive_pics, i);
 644         for (i = 0; i < current->num_positive_pics; i++) {
 645             infer(delta_poc_s1_minus1[i],
 646                   delta_poc_s1[i] - (i == 0 ? 0 : delta_poc_s1[i - 1]) - 1);
 647             infer(used_by_curr_pic_s1_flag[i], used_by_curr_pic_s1[i]);
 648         }
 649
 650     } else {
 651         ue(num_negative_pics, 0, 15);
 652         ue(num_positive_pics, 0, 15 - current->num_negative_pics);
 653
 654         for (i = 0; i < current->num_negative_pics; i++) {
 655             ues(delta_poc_s0_minus1[i], 0, INT16_MAX, 1, i);
 656             flags(used_by_curr_pic_s0_flag[i],        1, i);
 657         }
 658
 659         for (i = 0; i < current->num_positive_pics; i++) {
 660             ues(delta_poc_s1_minus1[i], 0, INT16_MAX, 1, i);
 661             flags(used_by_curr_pic_s1_flag[i],        1, i);
 662         }
 663     }
 664
 665     return 0;
 666 }
 667
 668 static int FUNC(scaling_list_data)(CodedBitstreamContext *ctx, RWContext *rw,
 669                                    H265RawScalingList *current)
 670 {
 671     int sizeId, matrixId;
 672     int err, n, i;
 673
 674     for (sizeId = 0; sizeId < 4; sizeId++) {
 675         for (matrixId = 0; matrixId < 6; matrixId += (sizeId == 3 ? 3 : 1)) {
 676             flags(scaling_list_pred_mode_flag[sizeId][matrixId],
 677                   2, sizeId, matrixId);
 678             if (!current->scaling_list_pred_mode_flag[sizeId][matrixId]) {
 679                 ues(scaling_list_pred_matrix_id_delta[sizeId][matrixId],
 680                     0, sizeId == 3 ? matrixId / 3 : matrixId,
 681                     2, sizeId, matrixId);
 682             } else {
 683                 n = FFMIN(64, 1 << (4 + (sizeId << 1)));
 684                 if (sizeId > 1) {
 685                     ses(scaling_list_dc_coef_minus8[sizeId - 2][matrixId], -7, +247,
 686                         2, sizeId - 2, matrixId);
 687                 }
 688                 for (i = 0; i < n; i++) {
 689                     ses(scaling_list_delta_coeff[sizeId][matrixId][i],
 690                         -128, +127, 3, sizeId, matrixId, i);
 691                 }
 692             }
 693         }
 694     }
 695
 696     return 0;
 697 }
 698
 699 static int FUNC(sps_range_extension)(CodedBitstreamContext *ctx, RWContext *rw,
 700                                      H265RawSPS *current)
 701 {
 702     int err;
 703
 704     flag(transform_skip_rotation_enabled_flag);
 705     flag(transform_skip_context_enabled_flag);
 706     flag(implicit_rdpcm_enabled_flag);
 707     flag(explicit_rdpcm_enabled_flag);
 708     flag(extended_precision_processing_flag);
 709     flag(intra_smoothing_disabled_flag);
 710     flag(high_precision_offsets_enabled_flag);
 711     flag(persistent_rice_adaptation_enabled_flag);
 712     flag(cabac_bypass_alignment_enabled_flag);
 713
 714     return 0;
 715 }
 716
 717 static int FUNC(sps_scc_extension)(CodedBitstreamContext *ctx, RWContext *rw,
 718                                    H265RawSPS *current)
 719 {
 720     int err, comp, i;
 721
 722     flag(sps_curr_pic_ref_enabled_flag);
 723
 724     flag(palette_mode_enabled_flag);
 725     if (current->palette_mode_enabled_flag) {
 726         ue(palette_max_size, 0, 64);
 727         ue(delta_palette_max_predictor_size, 0, 128);
 728
 729         flag(sps_palette_predictor_initializer_present_flag);
 730         if (current->sps_palette_predictor_initializer_present_flag) {
 731             ue(sps_num_palette_predictor_initializer_minus1, 0, 128);
 732             for (comp = 0; comp < (current->chroma_format_idc ? 3 : 1); comp++) {
 733                 int bit_depth = comp == 0 ? current->bit_depth_luma_minus8 + 8
 734                                           : current->bit_depth_chroma_minus8 + 8;
 735                 for (i = 0; i <= current->sps_num_palette_predictor_initializer_minus1; i++)
 736                     ubs(bit_depth, sps_palette_predictor_initializers[comp][i], 2, comp, i);
 737             }
 738         }
 739     }
 740
 741     u(2, motion_vector_resolution_control_idc, 0, 2);
 742     flag(intra_boundary_filtering_disable_flag);
 743
 744     return 0;
 745 }
 746
 747 static int FUNC(vui_parameters_default)(CodedBitstreamContext *ctx,
 748                                         RWContext *rw, H265RawVUI *current,
 749                                         H265RawSPS *sps)
 750 {
 751     infer(aspect_ratio_idc, 0);
 752
 753     infer(video_format,             5);
 754     infer(video_full_range_flag,    0);
 755     infer(colour_primaries,         2);
 756     infer(transfer_characteristics, 2);
 757     infer(matrix_coefficients,      2);
 758
 759     infer(chroma_sample_loc_type_top_field,    0);
 760     infer(chroma_sample_loc_type_bottom_field, 0);
 761
 762     infer(tiles_fixed_structure_flag,    0);
 763     infer(motion_vectors_over_pic_boundaries_flag, 1);
 764     infer(min_spatial_segmentation_idc,  0);
 765     infer(max_bytes_per_pic_denom,       2);
 766     infer(max_bits_per_min_cu_denom,     1);
 767     infer(log2_max_mv_length_horizontal, 15);
 768     infer(log2_max_mv_length_vertical,   15);
 769
 770     return 0;
 771 }
 772
 773 static int FUNC(sps)(CodedBitstreamContext *ctx, RWContext *rw,
 774                      H265RawSPS *current)
 775 {
 776     CodedBitstreamH265Context *h265 = ctx->priv_data;
 777     const H265RawVPS *vps;
 778     int err, i;
 779     unsigned int min_cb_log2_size_y, ctb_log2_size_y,
 780                  min_cb_size_y,   min_tb_log2_size_y;
 781
 782     HEADER("Sequence Parameter Set");
 783
 784     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, HEVC_NAL_SPS));
 785
 786     ub(4, sps_video_parameter_set_id);
 787     h265->active_vps = vps = h265->vps[current->sps_video_parameter_set_id];
 788
 789     u(3, sps_max_sub_layers_minus1, 0, HEVC_MAX_SUB_LAYERS - 1);
 790     flag(sps_temporal_id_nesting_flag);
 791     if (vps) {
 792         if (vps->vps_max_sub_layers_minus1 > current->sps_max_sub_layers_minus1) {
 793             av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid stream: "
 794                    "sps_max_sub_layers_minus1 (%d) must be less than or equal to "
 795                    "vps_max_sub_layers_minus1 (%d).\n",
 796                    vps->vps_max_sub_layers_minus1,
 797                    current->sps_max_sub_layers_minus1);
 798             return AVERROR_INVALIDDATA;
 799         }
 800         if (vps->vps_temporal_id_nesting_flag &&
 801             !current->sps_temporal_id_nesting_flag) {
 802             av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid stream: "
 803                    "sps_temporal_id_nesting_flag must be 1 if "
 804                    "vps_temporal_id_nesting_flag is 1.\n");
 805             return AVERROR_INVALIDDATA;
 806         }
 807     }
 808
 809     CHECK(FUNC(profile_tier_level)(ctx, rw, &current->profile_tier_level,
 810                                    1, current->sps_max_sub_layers_minus1));
 811
 812     ue(sps_seq_parameter_set_id, 0, 15);
 813
 814     ue(chroma_format_idc, 0, 3);
 815     if (current->chroma_format_idc == 3)
 816         flag(separate_colour_plane_flag);
 817     else
 818         infer(separate_colour_plane_flag, 0);
 819
 820     ue(pic_width_in_luma_samples,  1, HEVC_MAX_WIDTH);
 821     ue(pic_height_in_luma_samples, 1, HEVC_MAX_HEIGHT);
 822
 823     flag(conformance_window_flag);
 824     if (current->conformance_window_flag) {
 825         ue(conf_win_left_offset,   0, current->pic_width_in_luma_samples);
 826         ue(conf_win_right_offset,  0, current->pic_width_in_luma_samples);
 827         ue(conf_win_top_offset,    0, current->pic_height_in_luma_samples);
 828         ue(conf_win_bottom_offset, 0, current->pic_height_in_luma_samples);
 829     } else {
 830         infer(conf_win_left_offset,   0);
 831         infer(conf_win_right_offset,  0);
 832         infer(conf_win_top_offset,    0);
 833         infer(conf_win_bottom_offset, 0);
 834     }
 835
 836     ue(bit_depth_luma_minus8,   0, 8);
 837     ue(bit_depth_chroma_minus8, 0, 8);
 838
 839     ue(log2_max_pic_order_cnt_lsb_minus4, 0, 12);
 840
 841     flag(sps_sub_layer_ordering_info_present_flag);
 842     for (i = (current->sps_sub_layer_ordering_info_present_flag ?
 843               0 : current->sps_max_sub_layers_minus1);
 844          i <= current->sps_max_sub_layers_minus1; i++) {
 845         ues(sps_max_dec_pic_buffering_minus1[i],
 846             0, HEVC_MAX_DPB_SIZE - 1,                        1, i);
 847         ues(sps_max_num_reorder_pics[i],
 848             0, current->sps_max_dec_pic_buffering_minus1[i], 1, i);
 849         ues(sps_max_latency_increase_plus1[i],
 850             0, UINT32_MAX - 1,                               1, i);
 851     }
 852     if (!current->sps_sub_layer_ordering_info_present_flag) {
 853         for (i = 0; i < current->sps_max_sub_layers_minus1; i++) {
 854             infer(sps_max_dec_pic_buffering_minus1[i],
 855                   current->sps_max_dec_pic_buffering_minus1[current->sps_max_sub_layers_minus1]);
 856             infer(sps_max_num_reorder_pics[i],
 857                   current->sps_max_num_reorder_pics[current->sps_max_sub_layers_minus1]);
 858             infer(sps_max_latency_increase_plus1[i],
 859                   current->sps_max_latency_increase_plus1[current->sps_max_sub_layers_minus1]);
 860         }
 861     }
 862
 863     ue(log2_min_luma_coding_block_size_minus3,   0, 3);
 864     min_cb_log2_size_y = current->log2_min_luma_coding_block_size_minus3 + 3;
 865
 866     ue(log2_diff_max_min_luma_coding_block_size, 0, 3);
 867     ctb_log2_size_y = min_cb_log2_size_y +
 868         current->log2_diff_max_min_luma_coding_block_size;
 869
 870     min_cb_size_y = 1 << min_cb_log2_size_y;
 871     if (current->pic_width_in_luma_samples  % min_cb_size_y ||
 872         current->pic_height_in_luma_samples % min_cb_size_y) {
 873         av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid dimensions: %ux%u not divisible "
 874                "by MinCbSizeY = %u.\n", current->pic_width_in_luma_samples,
 875                current->pic_height_in_luma_samples, min_cb_size_y);
 876         return AVERROR_INVALIDDATA;
 877     }
 878
 879     ue(log2_min_luma_transform_block_size_minus2, 0, min_cb_log2_size_y - 3);
 880     min_tb_log2_size_y = current->log2_min_luma_transform_block_size_minus2 + 2;
 881
 882     ue(log2_diff_max_min_luma_transform_block_size,
 883        0, FFMIN(ctb_log2_size_y, 5) - min_tb_log2_size_y);
 884
 885     ue(max_transform_hierarchy_depth_inter,
 886        0, ctb_log2_size_y - min_tb_log2_size_y);
 887     ue(max_transform_hierarchy_depth_intra,
 888        0, ctb_log2_size_y - min_tb_log2_size_y);
 889
 890     flag(scaling_list_enabled_flag);
 891     if (current->scaling_list_enabled_flag) {
 892         flag(sps_scaling_list_data_present_flag);
 893         if (current->sps_scaling_list_data_present_flag)
 894             CHECK(FUNC(scaling_list_data)(ctx, rw, &current->scaling_list));
 895     } else {
 896         infer(sps_scaling_list_data_present_flag, 0);
 897     }
 898
 899     flag(amp_enabled_flag);
 900     flag(sample_adaptive_offset_enabled_flag);
 901
 902     flag(pcm_enabled_flag);
 903     if (current->pcm_enabled_flag) {
 904         u(4, pcm_sample_bit_depth_luma_minus1,
 905           0, current->bit_depth_luma_minus8 + 8 - 1);
 906         u(4, pcm_sample_bit_depth_chroma_minus1,
 907           0, current->bit_depth_chroma_minus8 + 8 - 1);
 908
 909         ue(log2_min_pcm_luma_coding_block_size_minus3,
 910            FFMIN(min_cb_log2_size_y, 5) - 3, FFMIN(ctb_log2_size_y, 5) - 3);
 911         ue(log2_diff_max_min_pcm_luma_coding_block_size,
 912            0, FFMIN(ctb_log2_size_y, 5) - (current->log2_min_pcm_luma_coding_block_size_minus3 + 3));
 913
 914         flag(pcm_loop_filter_disabled_flag);
 915     }
 916
 917     ue(num_short_term_ref_pic_sets, 0, HEVC_MAX_SHORT_TERM_REF_PIC_SETS);
 918     for (i = 0; i < current->num_short_term_ref_pic_sets; i++)
 919         CHECK(FUNC(st_ref_pic_set)(ctx, rw, &current->st_ref_pic_set[i], i, current));
 920
 921     flag(long_term_ref_pics_present_flag);
 922     if (current->long_term_ref_pics_present_flag) {
 923         ue(num_long_term_ref_pics_sps, 0, HEVC_MAX_LONG_TERM_REF_PICS);
 924         for (i = 0; i < current->num_long_term_ref_pics_sps; i++) {
 925             ubs(current->log2_max_pic_order_cnt_lsb_minus4 + 4,
 926                 lt_ref_pic_poc_lsb_sps[i], 1, i);
 927             flags(used_by_curr_pic_lt_sps_flag[i], 1, i);
 928         }
 929     }
 930
 931     flag(sps_temporal_mvp_enabled_flag);
 932     flag(strong_intra_smoothing_enabled_flag);
 933
 934     flag(vui_parameters_present_flag);
 935     if (current->vui_parameters_present_flag)
 936         CHECK(FUNC(vui_parameters)(ctx, rw, &current->vui, current));
 937     else
 938         CHECK(FUNC(vui_parameters_default)(ctx, rw, &current->vui, current));
 939
 940     flag(sps_extension_present_flag);
 941     if (current->sps_extension_present_flag) {
 942         flag(sps_range_extension_flag);
 943         flag(sps_multilayer_extension_flag);
 944         flag(sps_3d_extension_flag);
 945         flag(sps_scc_extension_flag);
 946         ub(4, sps_extension_4bits);
 947     }
 948
 949     if (current->sps_range_extension_flag)
 950         CHECK(FUNC(sps_range_extension)(ctx, rw, current));
 951     if (current->sps_multilayer_extension_flag)
 952         return AVERROR_PATCHWELCOME;
 953     if (current->sps_3d_extension_flag)
 954         return AVERROR_PATCHWELCOME;
 955     if (current->sps_scc_extension_flag)
 956         CHECK(FUNC(sps_scc_extension)(ctx, rw, current));
 957     if (current->sps_extension_4bits)
 958         CHECK(FUNC(extension_data)(ctx, rw, &current->extension_data));
 959
 960     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
 961
 962     return 0;
 963 }
 964
 965 static int FUNC(pps_range_extension)(CodedBitstreamContext *ctx, RWContext *rw,
 966                                      H265RawPPS *current)
 967 {
 968     CodedBitstreamH265Context *h265 = ctx->priv_data;
 969     const H265RawSPS *sps = h265->active_sps;
 970     int err, i;
 971
 972     if (current->transform_skip_enabled_flag)
 973         ue(log2_max_transform_skip_block_size_minus2, 0, 3);
 974     flag(cross_component_prediction_enabled_flag);
 975
 976     flag(chroma_qp_offset_list_enabled_flag);
 977     if (current->chroma_qp_offset_list_enabled_flag) {
 978         ue(diff_cu_chroma_qp_offset_depth,
 979            0, sps->log2_diff_max_min_luma_coding_block_size);
 980         ue(chroma_qp_offset_list_len_minus1, 0, 5);
 981         for (i = 0; i <= current->chroma_qp_offset_list_len_minus1; i++) {
 982             ses(cb_qp_offset_list[i], -12, +12, 1, i);
 983             ses(cr_qp_offset_list[i], -12, +12, 1, i);
 984         }
 985     }
 986
 987     ue(log2_sao_offset_scale_luma,   0, FFMAX(0, sps->bit_depth_luma_minus8   - 2));
 988     ue(log2_sao_offset_scale_chroma, 0, FFMAX(0, sps->bit_depth_chroma_minus8 - 2));
 989
 990     return 0;
 991 }
 992
 993 static int FUNC(pps_scc_extension)(CodedBitstreamContext *ctx, RWContext *rw,
 994                                    H265RawPPS *current)
 995 {
 996     int err, comp, i;
 997
 998     flag(pps_curr_pic_ref_enabled_flag);
 999
1000     flag(residual_adaptive_colour_transform_enabled_flag);
1001     if (current->residual_adaptive_colour_transform_enabled_flag) {
1002         flag(pps_slice_act_qp_offsets_present_flag);
1003         se(pps_act_y_qp_offset_plus5,  -7, +17);
1004         se(pps_act_cb_qp_offset_plus5, -7, +17);
1005         se(pps_act_cr_qp_offset_plus3, -9, +15);
1006     } else {
1007         infer(pps_slice_act_qp_offsets_present_flag, 0);
1008         infer(pps_act_y_qp_offset_plus5,  0);
1009         infer(pps_act_cb_qp_offset_plus5, 0);
1010         infer(pps_act_cr_qp_offset_plus3, 0);
1011     }
1012
1013     flag(pps_palette_predictor_initializer_present_flag);
1014     if (current->pps_palette_predictor_initializer_present_flag) {
1015         ue(pps_num_palette_predictor_initializer, 0, 128);
1016         if (current->pps_num_palette_predictor_initializer > 0) {
1017             flag(monochrome_palette_flag);
1018             ue(luma_bit_depth_entry_minus8, 0, 8);
1019             if (!current->monochrome_palette_flag)
1020                 ue(chroma_bit_depth_entry_minus8, 0, 8);
1021             for (comp = 0; comp < (current->monochrome_palette_flag ? 1 : 3); comp++) {
1022                 int bit_depth = comp == 0 ? current->luma_bit_depth_entry_minus8 + 8
1023                                           : current->chroma_bit_depth_entry_minus8 + 8;
1024                 for (i = 0; i < current->pps_num_palette_predictor_initializer; i++)
1025                     ubs(bit_depth, pps_palette_predictor_initializers[comp][i], 2, comp, i);
1026             }
1027         }
1028     }
1029
1030     return 0;
1031 }
1032
1033 static int FUNC(pps)(CodedBitstreamContext *ctx, RWContext *rw,
1034                      H265RawPPS *current)
1035 {
1036     CodedBitstreamH265Context *h265 = ctx->priv_data;
1037     const H265RawSPS *sps;
1038     int err, i;
1039
1040     HEADER("Picture Parameter Set");
1041
1042     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, HEVC_NAL_PPS));
1043
1044     ue(pps_pic_parameter_set_id, 0, 63);
1045     ue(pps_seq_parameter_set_id, 0, 15);
1046     sps = h265->sps[current->pps_seq_parameter_set_id];
1047     if (!sps) {
1048         av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",
1049                current->pps_seq_parameter_set_id);
1050         return AVERROR_INVALIDDATA;
1051     }
1052     h265->active_sps = sps;
1053
1054     flag(dependent_slice_segments_enabled_flag);
1055     flag(output_flag_present_flag);
1056     ub(3, num_extra_slice_header_bits);
1057     flag(sign_data_hiding_enabled_flag);
1058     flag(cabac_init_present_flag);
1059
1060     ue(num_ref_idx_l0_default_active_minus1, 0, 14);
1061     ue(num_ref_idx_l1_default_active_minus1, 0, 14);
1062
1063     se(init_qp_minus26, -(26 + 6 * sps->bit_depth_luma_minus8), +25);
1064
1065     flag(constrained_intra_pred_flag);
1066     flag(transform_skip_enabled_flag);
1067     flag(cu_qp_delta_enabled_flag);
1068     if (current->cu_qp_delta_enabled_flag)
1069         ue(diff_cu_qp_delta_depth,
1070            0, sps->log2_diff_max_min_luma_coding_block_size);
1071     else
1072         infer(diff_cu_qp_delta_depth, 0);
1073
1074     se(pps_cb_qp_offset, -12, +12);
1075     se(pps_cr_qp_offset, -12, +12);
1076     flag(pps_slice_chroma_qp_offsets_present_flag);
1077
1078     flag(weighted_pred_flag);
1079     flag(weighted_bipred_flag);
1080
1081     flag(transquant_bypass_enabled_flag);
1082     flag(tiles_enabled_flag);
1083     flag(entropy_coding_sync_enabled_flag);
1084
1085     if (current->tiles_enabled_flag) {
1086         ue(num_tile_columns_minus1, 0, HEVC_MAX_TILE_COLUMNS);
1087         ue(num_tile_rows_minus1,    0, HEVC_MAX_TILE_ROWS);
1088         flag(uniform_spacing_flag);
1089         if (!current->uniform_spacing_flag) {
1090             for (i = 0; i < current->num_tile_columns_minus1; i++)
1091                 ues(column_width_minus1[i], 0, sps->pic_width_in_luma_samples,  1, i);
1092             for (i = 0; i < current->num_tile_rows_minus1; i++)
1093                 ues(row_height_minus1[i],   0, sps->pic_height_in_luma_samples, 1, i);
1094         }
1095         flag(loop_filter_across_tiles_enabled_flag);
1096     } else {
1097         infer(num_tile_columns_minus1, 0);
1098         infer(num_tile_rows_minus1,    0);
1099     }
1100
1101     flag(pps_loop_filter_across_slices_enabled_flag);
1102     flag(deblocking_filter_control_present_flag);
1103     if (current->deblocking_filter_control_present_flag) {
1104         flag(deblocking_filter_override_enabled_flag);
1105         flag(pps_deblocking_filter_disabled_flag);
1106         if (!current->pps_deblocking_filter_disabled_flag) {
1107             se(pps_beta_offset_div2, -6, +6);
1108             se(pps_tc_offset_div2,   -6, +6);
1109         } else {
1110             infer(pps_beta_offset_div2, 0);
1111             infer(pps_tc_offset_div2,   0);
1112         }
1113     } else {
1114         infer(deblocking_filter_override_enabled_flag, 0);
1115         infer(pps_deblocking_filter_disabled_flag,     0);
1116         infer(pps_beta_offset_div2, 0);
1117         infer(pps_tc_offset_div2,   0);
1118     }
1119
1120     flag(pps_scaling_list_data_present_flag);
1121     if (current->pps_scaling_list_data_present_flag)
1122         CHECK(FUNC(scaling_list_data)(ctx, rw, &current->scaling_list));
1123
1124     flag(lists_modification_present_flag);
1125
1126     ue(log2_parallel_merge_level_minus2,
1127        0, (sps->log2_min_luma_coding_block_size_minus3 + 3 +
1128            sps->log2_diff_max_min_luma_coding_block_size - 2));
1129
1130     flag(slice_segment_header_extension_present_flag);
1131
1132     flag(pps_extension_present_flag);
1133     if (current->pps_extension_present_flag) {
1134         flag(pps_range_extension_flag);
1135         flag(pps_multilayer_extension_flag);
1136         flag(pps_3d_extension_flag);
1137         flag(pps_scc_extension_flag);
1138         ub(4, pps_extension_4bits);
1139     }
1140     if (current->pps_range_extension_flag)
1141         CHECK(FUNC(pps_range_extension)(ctx, rw, current));
1142     if (current->pps_multilayer_extension_flag)
1143         return AVERROR_PATCHWELCOME;
1144     if (current->pps_3d_extension_flag)
1145         return AVERROR_PATCHWELCOME;
1146     if (current->pps_scc_extension_flag)
1147         CHECK(FUNC(pps_scc_extension)(ctx, rw, current));
1148     if (current->pps_extension_4bits)
1149         CHECK(FUNC(extension_data)(ctx, rw, &current->extension_data));
1150
1151     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
1152
1153     return 0;
1154 }
1155
1156 static int FUNC(aud)(CodedBitstreamContext *ctx, RWContext *rw,
1157                      H265RawAUD *current)
1158 {
1159     int err;
1160
1161     HEADER("Access Unit Delimiter");
1162
1163     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, HEVC_NAL_AUD));
1164
1165     u(3, pic_type, 0, 2);
1166
1167     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
1168
1169     return 0;
1170 }
1171
1172 static int FUNC(ref_pic_lists_modification)(CodedBitstreamContext *ctx, RWContext *rw,
1173                                             H265RawSliceHeader *current,
1174                                             unsigned int num_pic_total_curr)
1175 {
1176     unsigned int entry_size;
1177     int err, i;
1178
1179     entry_size = av_log2(num_pic_total_curr - 1) + 1;
1180
1181     flag(ref_pic_list_modification_flag_l0);
1182     if (current->ref_pic_list_modification_flag_l0) {
1183         for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++)
1184             us(entry_size, list_entry_l0[i], 0, num_pic_total_curr - 1, 1, i);
1185     }
1186
1187     if (current->slice_type == HEVC_SLICE_B) {
1188         flag(ref_pic_list_modification_flag_l1);
1189         if (current->ref_pic_list_modification_flag_l1) {
1190             for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++)
1191                 us(entry_size, list_entry_l1[i], 0, num_pic_total_curr - 1, 1, i);
1192         }
1193     }
1194
1195     return 0;
1196 }
1197
1198 static int FUNC(pred_weight_table)(CodedBitstreamContext *ctx, RWContext *rw,
1199                                    H265RawSliceHeader *current)
1200 {
1201     CodedBitstreamH265Context *h265 = ctx->priv_data;
1202     const H265RawSPS *sps = h265->active_sps;
1203     int err, i, j;
1204     int chroma = !sps->separate_colour_plane_flag &&
1205                   sps->chroma_format_idc != 0;
1206
1207     ue(luma_log2_weight_denom, 0, 7);
1208     if (chroma)
1209         se(delta_chroma_log2_weight_denom, -7, 7);
1210     else
1211         infer(delta_chroma_log2_weight_denom, 0);
1212
1213     for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++) {
1214         if (1 /* is not same POC and same layer_id */)
1215             flags(luma_weight_l0_flag[i], 1, i);
1216         else
1217             infer(luma_weight_l0_flag[i], 0);
1218     }
1219     if (chroma) {
1220         for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++) {
1221             if (1 /* is not same POC and same layer_id */)
1222                 flags(chroma_weight_l0_flag[i], 1, i);
1223             else
1224                 infer(chroma_weight_l0_flag[i], 0);
1225         }
1226     }
1227
1228     for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++) {
1229         if (current->luma_weight_l0_flag[i]) {
1230             ses(delta_luma_weight_l0[i], -128, +127, 1, i);
1231             ses(luma_offset_l0[i],
1232                 -(1 << (sps->bit_depth_luma_minus8 + 8 - 1)),
1233                 ((1 << (sps->bit_depth_luma_minus8 + 8 - 1)) - 1), 1, i);
1234         } else {
1235             infer(delta_luma_weight_l0[i], 0);
1236             infer(luma_offset_l0[i],       0);
1237         }
1238         if (current->chroma_weight_l0_flag[i]) {
1239             for (j = 0; j < 2; j++) {
1240                 ses(delta_chroma_weight_l0[i][j], -128, +127, 2, i, j);
1241                 ses(chroma_offset_l0[i][j],
1242                     -(4 << (sps->bit_depth_chroma_minus8 + 8 - 1)),
1243                     ((4 << (sps->bit_depth_chroma_minus8 + 8 - 1)) - 1), 2, i, j);
1244             }
1245         } else {
1246             for (j = 0; j < 2; j++) {
1247                 infer(delta_chroma_weight_l0[i][j], 0);
1248                 infer(chroma_offset_l0[i][j],       0);
1249             }
1250         }
1251     }
1252
1253     if (current->slice_type == HEVC_SLICE_B) {
1254         for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++) {
1255             if (1 /* RefPicList1[i] is not CurrPic, nor is it in a different layer */)
1256                 flags(luma_weight_l1_flag[i], 1, i);
1257             else
1258                 infer(luma_weight_l1_flag[i], 0);
1259         }
1260         if (chroma) {
1261             for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++) {
1262                 if (1 /* RefPicList1[i] is not CurrPic, nor is it in a different layer */)
1263                     flags(chroma_weight_l1_flag[i], 1, i);
1264                 else
1265                     infer(chroma_weight_l1_flag[i], 0);
1266             }
1267         }
1268
1269         for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++) {
1270             if (current->luma_weight_l1_flag[i]) {
1271                 ses(delta_luma_weight_l1[i], -128, +127, 1, i);
1272                 ses(luma_offset_l1[i],
1273                     -(1 << (sps->bit_depth_luma_minus8 + 8 - 1)),
1274                     ((1 << (sps->bit_depth_luma_minus8 + 8 - 1)) - 1), 1, i);
1275             } else {
1276                 infer(delta_luma_weight_l1[i], 0);
1277                 infer(luma_offset_l1[i],       0);
1278             }
1279             if (current->chroma_weight_l1_flag[i]) {
1280                 for (j = 0; j < 2; j++) {
1281                     ses(delta_chroma_weight_l1[i][j], -128, +127, 2, i, j);
1282                     ses(chroma_offset_l1[i][j],
1283                         -(4 << (sps->bit_depth_chroma_minus8 + 8 - 1)),
1284                         ((4 << (sps->bit_depth_chroma_minus8 + 8 - 1)) - 1), 2, i, j);
1285                 }
1286             } else {
1287                 for (j = 0; j < 2; j++) {
1288                     infer(delta_chroma_weight_l1[i][j], 0);
1289                     infer(chroma_offset_l1[i][j],       0);
1290                 }
1291             }
1292         }
1293     }
1294
1295     return 0;
1296 }
1297
1298 static int FUNC(slice_segment_header)(CodedBitstreamContext *ctx, RWContext *rw,
1299                                       H265RawSliceHeader *current)
1300 {
1301     CodedBitstreamH265Context *h265 = ctx->priv_data;
1302     const H265RawSPS *sps;
1303     const H265RawPPS *pps;
1304     unsigned int min_cb_log2_size_y, ctb_log2_size_y, ctb_size_y;
1305     unsigned int pic_width_in_ctbs_y, pic_height_in_ctbs_y, pic_size_in_ctbs_y;
1306     unsigned int num_pic_total_curr = 0;
1307     int err, i;
1308
1309     HEADER("Slice Segment Header");
1310
1311     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, -1));
1312
1313     flag(first_slice_segment_in_pic_flag);
1314
1315     if (current->nal_unit_header.nal_unit_type >= HEVC_NAL_BLA_W_LP &&
1316         current->nal_unit_header.nal_unit_type <= HEVC_NAL_RSV_IRAP_VCL23)
1317         flag(no_output_of_prior_pics_flag);
1318
1319     ue(slice_pic_parameter_set_id, 0, 63);
1320
1321     pps = h265->pps[current->slice_pic_parameter_set_id];
1322     if (!pps) {
1323         av_log(ctx->log_ctx, AV_LOG_ERROR, "PPS id %d not available.\n",
1324                current->slice_pic_parameter_set_id);
1325         return AVERROR_INVALIDDATA;
1326     }
1327     h265->active_pps = pps;
1328
1329     sps = h265->sps[pps->pps_seq_parameter_set_id];
1330     if (!sps) {
1331         av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",
1332                pps->pps_seq_parameter_set_id);
1333         return AVERROR_INVALIDDATA;
1334     }
1335     h265->active_sps = sps;
1336
1337     min_cb_log2_size_y = sps->log2_min_luma_coding_block_size_minus3 + 3;
1338     ctb_log2_size_y = min_cb_log2_size_y + sps->log2_diff_max_min_luma_coding_block_size;
1339     ctb_size_y = 1 << ctb_log2_size_y;
1340     pic_width_in_ctbs_y =
1341         (sps->pic_width_in_luma_samples + ctb_size_y - 1) / ctb_size_y;
1342     pic_height_in_ctbs_y =
1343         (sps->pic_height_in_luma_samples + ctb_size_y - 1) / ctb_size_y;
1344     pic_size_in_ctbs_y = pic_width_in_ctbs_y * pic_height_in_ctbs_y;
1345
1346     if (!current->first_slice_segment_in_pic_flag) {
1347         unsigned int address_size = av_log2(pic_size_in_ctbs_y - 1) + 1;
1348         if (pps->dependent_slice_segments_enabled_flag)
1349             flag(dependent_slice_segment_flag);
1350         else
1351             infer(dependent_slice_segment_flag, 0);
1352         u(address_size, slice_segment_address, 0, pic_size_in_ctbs_y - 1);
1353     } else {
1354         infer(dependent_slice_segment_flag, 0);
1355     }
1356
1357     if (!current->dependent_slice_segment_flag) {
1358         for (i = 0; i < pps->num_extra_slice_header_bits; i++)
1359             flags(slice_reserved_flag[i], 1, i);
1360
1361         ue(slice_type, 0, 2);
1362
1363         if (pps->output_flag_present_flag)
1364             flag(pic_output_flag);
1365
1366         if (sps->separate_colour_plane_flag)
1367             u(2, colour_plane_id, 0, 2);
1368
1369         if (current->nal_unit_header.nal_unit_type != HEVC_NAL_IDR_W_RADL &&
1370             current->nal_unit_header.nal_unit_type != HEVC_NAL_IDR_N_LP) {
1371             const H265RawSTRefPicSet *rps;
1372             int dpb_slots_remaining;
1373
1374             ub(sps->log2_max_pic_order_cnt_lsb_minus4 + 4, slice_pic_order_cnt_lsb);
1375
1376             flag(short_term_ref_pic_set_sps_flag);
1377             if (!current->short_term_ref_pic_set_sps_flag) {
1378                 CHECK(FUNC(st_ref_pic_set)(ctx, rw, &current->short_term_ref_pic_set,
1379                                            sps->num_short_term_ref_pic_sets, sps));
1380                 rps = &current->short_term_ref_pic_set;
1381             } else if (sps->num_short_term_ref_pic_sets > 1) {
1382                 unsigned int idx_size = av_log2(sps->num_short_term_ref_pic_sets - 1) + 1;
1383                 u(idx_size, short_term_ref_pic_set_idx,
1384                   0, sps->num_short_term_ref_pic_sets - 1);
1385                 rps = &sps->st_ref_pic_set[current->short_term_ref_pic_set_idx];
1386             } else {
1387                 infer(short_term_ref_pic_set_idx, 0);
1388                 rps = &sps->st_ref_pic_set[0];
1389             }
1390
1391             dpb_slots_remaining = HEVC_MAX_DPB_SIZE - 1 -
1392                 rps->num_negative_pics - rps->num_positive_pics;
1393             if (pps->pps_curr_pic_ref_enabled_flag &&
1394                 (sps->sample_adaptive_offset_enabled_flag ||
1395                  !pps->pps_deblocking_filter_disabled_flag ||
1396                  pps->deblocking_filter_override_enabled_flag)) {
1397                 // This picture will occupy two DPB slots.
1398                 if (dpb_slots_remaining == 0) {
1399                     av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid stream: "
1400                            "short-term ref pic set contains too many pictures "
1401                            "to use with current picture reference enabled.\n");
1402                     return AVERROR_INVALIDDATA;
1403                 }
1404                 --dpb_slots_remaining;
1405             }
1406
1407             num_pic_total_curr = 0;
1408             for (i = 0; i < rps->num_negative_pics; i++)
1409                 if (rps->used_by_curr_pic_s0_flag[i])
1410                     ++num_pic_total_curr;
1411             for (i = 0; i < rps->num_positive_pics; i++)
1412                 if (rps->used_by_curr_pic_s1_flag[i])
1413                     ++num_pic_total_curr;
1414
1415             if (sps->long_term_ref_pics_present_flag) {
1416                 unsigned int idx_size;
1417
1418                 if (sps->num_long_term_ref_pics_sps > 0) {
1419                     ue(num_long_term_sps, 0, FFMIN(sps->num_long_term_ref_pics_sps,
1420                                                    dpb_slots_remaining));
1421                     idx_size = av_log2(sps->num_long_term_ref_pics_sps - 1) + 1;
1422                     dpb_slots_remaining -= current->num_long_term_sps;
1423                 } else {
1424                     infer(num_long_term_sps, 0);
1425                     idx_size = 0;
1426                 }
1427                 ue(num_long_term_pics, 0, dpb_slots_remaining);
1428
1429                 for (i = 0; i < current->num_long_term_sps +
1430                                 current->num_long_term_pics; i++) {
1431                     if (i < current->num_long_term_sps) {
1432                         if (sps->num_long_term_ref_pics_sps > 1)
1433                             us(idx_size, lt_idx_sps[i],
1434                                0, sps->num_long_term_ref_pics_sps - 1, 1, i);
1435                         if (sps->used_by_curr_pic_lt_sps_flag[current->lt_idx_sps[i]])
1436                             ++num_pic_total_curr;
1437                     } else {
1438                         ubs(sps->log2_max_pic_order_cnt_lsb_minus4 + 4, poc_lsb_lt[i], 1, i);
1439                         flags(used_by_curr_pic_lt_flag[i], 1, i);
1440                         if (current->used_by_curr_pic_lt_flag[i])
1441                             ++num_pic_total_curr;
1442                     }
1443                     flags(delta_poc_msb_present_flag[i], 1, i);
1444                     if (current->delta_poc_msb_present_flag[i])
1445                         ues(delta_poc_msb_cycle_lt[i], 0, UINT32_MAX - 1, 1, i);
1446                     else
1447                         infer(delta_poc_msb_cycle_lt[i], 0);
1448                 }
1449             }
1450
1451             if (sps->sps_temporal_mvp_enabled_flag)
1452                 flag(slice_temporal_mvp_enabled_flag);
1453             else
1454                 infer(slice_temporal_mvp_enabled_flag, 0);
1455
1456             if (pps->pps_curr_pic_ref_enabled_flag)
1457                 ++num_pic_total_curr;
1458         }
1459
1460         if (sps->sample_adaptive_offset_enabled_flag) {
1461             flag(slice_sao_luma_flag);
1462             if (!sps->separate_colour_plane_flag && sps->chroma_format_idc != 0)
1463                 flag(slice_sao_chroma_flag);
1464             else
1465                 infer(slice_sao_chroma_flag, 0);
1466         } else {
1467             infer(slice_sao_luma_flag,   0);
1468             infer(slice_sao_chroma_flag, 0);
1469         }
1470
1471         if (current->slice_type == HEVC_SLICE_P ||
1472             current->slice_type == HEVC_SLICE_B) {
1473             flag(num_ref_idx_active_override_flag);
1474             if (current->num_ref_idx_active_override_flag) {
1475                 ue(num_ref_idx_l0_active_minus1, 0, 14);
1476                 if (current->slice_type == HEVC_SLICE_B)
1477                     ue(num_ref_idx_l1_active_minus1, 0, 14);
1478                 else
1479                     infer(num_ref_idx_l1_active_minus1, pps->num_ref_idx_l1_default_active_minus1);
1480             } else {
1481                 infer(num_ref_idx_l0_active_minus1, pps->num_ref_idx_l0_default_active_minus1);
1482                 infer(num_ref_idx_l1_active_minus1, pps->num_ref_idx_l1_default_active_minus1);
1483             }
1484
1485             if (pps->lists_modification_present_flag && num_pic_total_curr > 1)
1486                 CHECK(FUNC(ref_pic_lists_modification)(ctx, rw, current,
1487                                                        num_pic_total_curr));
1488
1489             if (current->slice_type == HEVC_SLICE_B)
1490                 flag(mvd_l1_zero_flag);
1491             if (pps->cabac_init_present_flag)
1492                 flag(cabac_init_flag);
1493             else
1494                 infer(cabac_init_flag, 0);
1495             if (current->slice_temporal_mvp_enabled_flag) {
1496                 if (current->slice_type == HEVC_SLICE_B)
1497                     flag(collocated_from_l0_flag);
1498                 else
1499                     infer(collocated_from_l0_flag, 1);
1500                 if (current->collocated_from_l0_flag) {
1501                     if (current->num_ref_idx_l0_active_minus1 > 0)
1502                         ue(collocated_ref_idx, 0, current->num_ref_idx_l0_active_minus1);
1503                     else
1504                         infer(collocated_ref_idx, 0);
1505                 } else {
1506                     if (current->num_ref_idx_l1_active_minus1 > 0)
1507                         ue(collocated_ref_idx, 0, current->num_ref_idx_l1_active_minus1);
1508                     else
1509                         infer(collocated_ref_idx, 0);
1510                 }
1511             }
1512
1513             if ((pps->weighted_pred_flag   && current->slice_type == HEVC_SLICE_P) ||
1514                 (pps->weighted_bipred_flag && current->slice_type == HEVC_SLICE_B))
1515                 CHECK(FUNC(pred_weight_table)(ctx, rw, current));
1516
1517             ue(five_minus_max_num_merge_cand, 0, 4);
1518             if (sps->motion_vector_resolution_control_idc == 2)
1519                 flag(use_integer_mv_flag);
1520             else
1521                 infer(use_integer_mv_flag, sps->motion_vector_resolution_control_idc);
1522         }
1523
1524         se(slice_qp_delta,
1525            - 6 * sps->bit_depth_luma_minus8 - (pps->init_qp_minus26 + 26),
1526            + 51 - (pps->init_qp_minus26 + 26));
1527         if (pps->pps_slice_chroma_qp_offsets_present_flag) {
1528             se(slice_cb_qp_offset, -12, +12);
1529             se(slice_cr_qp_offset, -12, +12);
1530         } else {
1531             infer(slice_cb_qp_offset, 0);
1532             infer(slice_cr_qp_offset, 0);
1533         }
1534         if (pps->pps_slice_act_qp_offsets_present_flag) {
1535             se(slice_act_y_qp_offset,
1536                -12 - (pps->pps_act_y_qp_offset_plus5 - 5),
1537                +12 - (pps->pps_act_y_qp_offset_plus5 - 5));
1538             se(slice_act_cb_qp_offset,
1539                -12 - (pps->pps_act_cb_qp_offset_plus5 - 5),
1540                +12 - (pps->pps_act_cb_qp_offset_plus5 - 5));
1541             se(slice_act_cr_qp_offset,
1542                -12 - (pps->pps_act_cr_qp_offset_plus3 - 3),
1543                +12 - (pps->pps_act_cr_qp_offset_plus3 - 3));
1544         } else {
1545             infer(slice_act_y_qp_offset,  0);
1546             infer(slice_act_cb_qp_offset, 0);
1547             infer(slice_act_cr_qp_offset, 0);
1548         }
1549         if (pps->chroma_qp_offset_list_enabled_flag)
1550             flag(cu_chroma_qp_offset_enabled_flag);
1551         else
1552             infer(cu_chroma_qp_offset_enabled_flag, 0);
1553
1554         if (pps->deblocking_filter_override_enabled_flag)
1555             flag(deblocking_filter_override_flag);
1556         else
1557             infer(deblocking_filter_override_flag, 0);
1558         if (current->deblocking_filter_override_flag) {
1559             flag(slice_deblocking_filter_disabled_flag);
1560             if (!current->slice_deblocking_filter_disabled_flag) {
1561                 se(slice_beta_offset_div2, -6, +6);
1562                 se(slice_tc_offset_div2,   -6, +6);
1563             } else {
1564                 infer(slice_beta_offset_div2, pps->pps_beta_offset_div2);
1565                 infer(slice_tc_offset_div2,   pps->pps_tc_offset_div2);
1566             }
1567         } else {
1568             infer(slice_deblocking_filter_disabled_flag,
1569                   pps->pps_deblocking_filter_disabled_flag);
1570             infer(slice_beta_offset_div2, pps->pps_beta_offset_div2);
1571             infer(slice_tc_offset_div2,   pps->pps_tc_offset_div2);
1572         }
1573         if (pps->pps_loop_filter_across_slices_enabled_flag &&
1574             (current->slice_sao_luma_flag || current->slice_sao_chroma_flag ||
1575              !current->slice_deblocking_filter_disabled_flag))
1576             flag(slice_loop_filter_across_slices_enabled_flag);
1577         else
1578             infer(slice_loop_filter_across_slices_enabled_flag,
1579                   pps->pps_loop_filter_across_slices_enabled_flag);
1580     }
1581
1582     if (pps->tiles_enabled_flag || pps->entropy_coding_sync_enabled_flag) {
1583         unsigned int num_entry_point_offsets_limit;
1584         if (!pps->tiles_enabled_flag && pps->entropy_coding_sync_enabled_flag)
1585             num_entry_point_offsets_limit = pic_height_in_ctbs_y - 1;
1586         else if (pps->tiles_enabled_flag && !pps->entropy_coding_sync_enabled_flag)
1587             num_entry_point_offsets_limit =
1588                 (pps->num_tile_columns_minus1 + 1) * (pps->num_tile_rows_minus1 + 1);
1589         else
1590             num_entry_point_offsets_limit =
1591                 (pps->num_tile_columns_minus1 + 1) * pic_height_in_ctbs_y - 1;
1592         ue(num_entry_point_offsets, 0, num_entry_point_offsets_limit);
1593
1594         if (current->num_entry_point_offsets > HEVC_MAX_ENTRY_POINT_OFFSETS) {
1595             av_log(ctx->log_ctx, AV_LOG_ERROR, "Too many entry points: "
1596                    "%"PRIu16".\n", current->num_entry_point_offsets);
1597             return AVERROR_PATCHWELCOME;
1598         }
1599
1600         if (current->num_entry_point_offsets > 0) {
1601             ue(offset_len_minus1, 0, 31);
1602             for (i = 0; i < current->num_entry_point_offsets; i++)
1603                 ubs(current->offset_len_minus1 + 1, entry_point_offset_minus1[i], 1, i);
1604         }
1605     }
1606
1607     if (pps->slice_segment_header_extension_present_flag) {
1608         ue(slice_segment_header_extension_length, 0, 256);
1609         for (i = 0; i < current->slice_segment_header_extension_length; i++)
1610             us(8, slice_segment_header_extension_data_byte[i], 0x00, 0xff, 1, i);
1611     }
1612
1613     CHECK(FUNC(byte_alignment)(ctx, rw));
1614
1615     return 0;
1616 }
1617
1618 static int FUNC(sei_buffering_period)
1619     (CodedBitstreamContext *ctx, RWContext *rw,
1620      H265RawSEIBufferingPeriod *current, SEIMessageState *sei)
1621 {
1622     CodedBitstreamH265Context *h265 = ctx->priv_data;
1623     const H265RawSPS *sps;
1624     const H265RawHRDParameters *hrd;
1625     int err, i, length;
1626
1627 #ifdef READ
1628     int start_pos, end_pos;
1629     start_pos = get_bits_count(rw);
1630 #endif
1631
1632     HEADER("Buffering Period");
1633
1634     ue(bp_seq_parameter_set_id, 0, HEVC_MAX_SPS_COUNT - 1);
1635
1636     sps = h265->sps[current->bp_seq_parameter_set_id];
1637     if (!sps) {
1638         av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",
1639                current->bp_seq_parameter_set_id);
1640         return AVERROR_INVALIDDATA;
1641     }
1642     h265->active_sps = sps;
1643
1644     if (!sps->vui_parameters_present_flag ||
1645         !sps->vui.vui_hrd_parameters_present_flag) {
1646         av_log(ctx->log_ctx, AV_LOG_ERROR, "Buffering period SEI requires "
1647                "HRD parameters to be present in SPS.\n");
1648         return AVERROR_INVALIDDATA;
1649     }
1650     hrd = &sps->vui.hrd_parameters;
1651     if (!hrd->nal_hrd_parameters_present_flag &&
1652         !hrd->vcl_hrd_parameters_present_flag) {
1653         av_log(ctx->log_ctx, AV_LOG_ERROR, "Buffering period SEI requires "
1654                "NAL or VCL HRD parameters to be present.\n");
1655         return AVERROR_INVALIDDATA;
1656     }
1657
1658     if (!hrd->sub_pic_hrd_params_present_flag)
1659         flag(irap_cpb_params_present_flag);
1660     else
1661         infer(irap_cpb_params_present_flag, 0);
1662     if (current->irap_cpb_params_present_flag) {
1663         length = hrd->au_cpb_removal_delay_length_minus1 + 1;
1664         ub(length, cpb_delay_offset);
1665         length = hrd->dpb_output_delay_length_minus1 + 1;
1666         ub(length, dpb_delay_offset);
1667     } else {
1668         infer(cpb_delay_offset, 0);
1669         infer(dpb_delay_offset, 0);
1670     }
1671
1672     flag(concatenation_flag);
1673
1674     length = hrd->au_cpb_removal_delay_length_minus1 + 1;
1675     ub(length, au_cpb_removal_delay_delta_minus1);
1676
1677     if (hrd->nal_hrd_parameters_present_flag) {
1678         for (i = 0; i <= hrd->cpb_cnt_minus1[0]; i++) {
1679             length = hrd->initial_cpb_removal_delay_length_minus1 + 1;
1680
1681             ubs(length, nal_initial_cpb_removal_delay[i], 1, i);
1682             ubs(length, nal_initial_cpb_removal_offset[i], 1, i);
1683
1684             if (hrd->sub_pic_hrd_params_present_flag ||
1685                 current->irap_cpb_params_present_flag) {
1686                 ubs(length, nal_initial_alt_cpb_removal_delay[i], 1, i);
1687                 ubs(length, nal_initial_alt_cpb_removal_offset[i], 1, i);
1688             }
1689         }
1690     }
1691     if (hrd->vcl_hrd_parameters_present_flag) {
1692         for (i = 0; i <= hrd->cpb_cnt_minus1[0]; i++) {
1693             length = hrd->initial_cpb_removal_delay_length_minus1 + 1;
1694
1695             ubs(length, vcl_initial_cpb_removal_delay[i], 1, i);
1696             ubs(length, vcl_initial_cpb_removal_offset[i], 1, i);
1697
1698             if (hrd->sub_pic_hrd_params_present_flag ||
1699                 current->irap_cpb_params_present_flag) {
1700                 ubs(length, vcl_initial_alt_cpb_removal_delay[i], 1, i);
1701                 ubs(length, vcl_initial_alt_cpb_removal_offset[i], 1, i);
1702             }
1703         }
1704     }
1705
1706 #ifdef READ
1707     end_pos = get_bits_count(rw);
1708     if (cbs_h265_payload_extension_present(rw, sei->payload_size,
1709                                            end_pos - start_pos))
1710         flag(use_alt_cpb_params_flag);
1711     else
1712         infer(use_alt_cpb_params_flag, 0);
1713 #else
1714     // If unknown extension data exists, then use_alt_cpb_params_flag is
1715     // coded in the bitstream and must be written even if it's 0.
1716     if (current->use_alt_cpb_params_flag || sei->extension_present) {
1717         flag(use_alt_cpb_params_flag);
1718         // Ensure this bit is not the last in the payload by making the
1719         // more_data_in_payload() check evaluate to true, so it may not
1720         // be mistaken as something else by decoders.
1721         sei->extension_present = 1;
1722     }
1723 #endif
1724
1725     return 0;
1726 }
1727
1728 static int FUNC(sei_pic_timing)
1729     (CodedBitstreamContext *ctx, RWContext *rw,
1730      H265RawSEIPicTiming *current, SEIMessageState *sei)
1731 {
1732     CodedBitstreamH265Context *h265 = ctx->priv_data;
1733     const H265RawSPS *sps;
1734     const H265RawHRDParameters *hrd;
1735     int err, expected_source_scan_type, i, length;
1736
1737     HEADER("Picture Timing");
1738
1739     sps = h265->active_sps;
1740     if (!sps) {
1741         av_log(ctx->log_ctx, AV_LOG_ERROR,
1742                "No active SPS for pic_timing.\n");
1743         return AVERROR_INVALIDDATA;
1744     }
1745
1746     expected_source_scan_type = 2 -
1747         2 * sps->profile_tier_level.general_interlaced_source_flag -
1748         sps->profile_tier_level.general_progressive_source_flag;
1749
1750     if (sps->vui.frame_field_info_present_flag) {
1751         u(4, pic_struct, 0, 12);
1752         u(2, source_scan_type,
1753           expected_source_scan_type >= 0 ? expected_source_scan_type : 0,
1754           expected_source_scan_type >= 0 ? expected_source_scan_type : 2);
1755         flag(duplicate_flag);
1756     } else {
1757         infer(pic_struct, 0);
1758         infer(source_scan_type,
1759               expected_source_scan_type >= 0 ? expected_source_scan_type : 2);
1760         infer(duplicate_flag, 0);
1761     }
1762
1763     if (sps->vui_parameters_present_flag &&
1764         sps->vui.vui_hrd_parameters_present_flag)
1765         hrd = &sps->vui.hrd_parameters;
1766     else
1767         hrd = NULL;
1768     if (hrd && (hrd->nal_hrd_parameters_present_flag ||
1769                 hrd->vcl_hrd_parameters_present_flag)) {
1770         length = hrd->au_cpb_removal_delay_length_minus1 + 1;
1771         ub(length, au_cpb_removal_delay_minus1);
1772
1773         length = hrd->dpb_output_delay_length_minus1 + 1;
1774         ub(length, pic_dpb_output_delay);
1775
1776         if (hrd->sub_pic_hrd_params_present_flag) {
1777             length = hrd->dpb_output_delay_du_length_minus1 + 1;
1778             ub(length, pic_dpb_output_du_delay);
1779         }
1780
1781         if (hrd->sub_pic_hrd_params_present_flag &&
1782             hrd->sub_pic_cpb_params_in_pic_timing_sei_flag) {
1783             // Each decoding unit must contain at least one slice segment.
1784             ue(num_decoding_units_minus1, 0, HEVC_MAX_SLICE_SEGMENTS);
1785             flag(du_common_cpb_removal_delay_flag);
1786
1787             length = hrd->du_cpb_removal_delay_increment_length_minus1 + 1;
1788             if (current->du_common_cpb_removal_delay_flag)
1789                 ub(length, du_common_cpb_removal_delay_increment_minus1);
1790
1791             for (i = 0; i <= current->num_decoding_units_minus1; i++) {
1792                 ues(num_nalus_in_du_minus1[i],
1793                     0, HEVC_MAX_SLICE_SEGMENTS, 1, i);
1794                 if (!current->du_common_cpb_removal_delay_flag &&
1795                     i < current->num_decoding_units_minus1)
1796                     ubs(length, du_cpb_removal_delay_increment_minus1[i], 1, i);
1797             }
1798         }
1799     }
1800
1801     return 0;
1802 }
1803
1804 static int FUNC(sei_pan_scan_rect)
1805     (CodedBitstreamContext *ctx, RWContext *rw,
1806      H265RawSEIPanScanRect *current, SEIMessageState *sei)
1807 {
1808     int err, i;
1809
1810     HEADER("Pan-Scan Rectangle");
1811
1812     ue(pan_scan_rect_id, 0, UINT32_MAX - 1);
1813     flag(pan_scan_rect_cancel_flag);
1814
1815     if (!current->pan_scan_rect_cancel_flag) {
1816         ue(pan_scan_cnt_minus1, 0, 2);
1817
1818         for (i = 0; i <= current->pan_scan_cnt_minus1; i++) {
1819             ses(pan_scan_rect_left_offset[i],   INT32_MIN + 1, INT32_MAX, 1, i);
1820             ses(pan_scan_rect_right_offset[i],  INT32_MIN + 1, INT32_MAX, 1, i);
1821             ses(pan_scan_rect_top_offset[i],    INT32_MIN + 1, INT32_MAX, 1, i);
1822             ses(pan_scan_rect_bottom_offset[i], INT32_MIN + 1, INT32_MAX, 1, i);
1823         }
1824
1825         flag(pan_scan_rect_persistence_flag);
1826     }
1827
1828     return 0;
1829 }
1830
1831 static int FUNC(sei_recovery_point)
1832     (CodedBitstreamContext *ctx, RWContext *rw,
1833      H265RawSEIRecoveryPoint *current, SEIMessageState *sei)
1834 {
1835     int err;
1836
1837     HEADER("Recovery Point");
1838
1839     se(recovery_poc_cnt, -32768, 32767);
1840
1841     flag(exact_match_flag);
1842     flag(broken_link_flag);
1843
1844     return 0;
1845 }
1846
1847 static int FUNC(sei_display_orientation)
1848     (CodedBitstreamContext *ctx, RWContext *rw,
1849      H265RawSEIDisplayOrientation *current, SEIMessageState *sei)
1850 {
1851     int err;
1852
1853     HEADER("Display Orientation");
1854
1855     flag(display_orientation_cancel_flag);
1856     if (!current->display_orientation_cancel_flag) {
1857         flag(hor_flip);
1858         flag(ver_flip);
1859         ub(16, anticlockwise_rotation);
1860         flag(display_orientation_persistence_flag);
1861     }
1862
1863     return 0;
1864 }
1865
1866 static int FUNC(sei_active_parameter_sets)
1867     (CodedBitstreamContext *ctx, RWContext *rw,
1868      H265RawSEIActiveParameterSets *current, SEIMessageState *sei)
1869 {
1870     CodedBitstreamH265Context *h265 = ctx->priv_data;
1871     const H265RawVPS *vps;
1872     int err, i;
1873
1874     HEADER("Active Parameter Sets");
1875
1876     u(4, active_video_parameter_set_id, 0, HEVC_MAX_VPS_COUNT);
1877     vps = h265->vps[current->active_video_parameter_set_id];
1878     if (!vps) {
1879         av_log(ctx->log_ctx, AV_LOG_ERROR, "VPS id %d not available for active "
1880                "parameter sets.\n", current->active_video_parameter_set_id);
1881         return AVERROR_INVALIDDATA;
1882     }
1883     h265->active_vps = vps;
1884
1885     flag(self_contained_cvs_flag);
1886     flag(no_parameter_set_update_flag);
1887
1888     ue(num_sps_ids_minus1, 0, HEVC_MAX_SPS_COUNT - 1);
1889     for (i = 0; i <= current->num_sps_ids_minus1; i++)
1890         ues(active_seq_parameter_set_id[i], 0, HEVC_MAX_SPS_COUNT - 1, 1, i);
1891
1892     for (i = vps->vps_base_layer_internal_flag;
1893          i <= FFMIN(62, vps->vps_max_layers_minus1); i++) {
1894         ues(layer_sps_idx[i], 0, current->num_sps_ids_minus1, 1, i);
1895
1896         if (i == 0)
1897             h265->active_sps = h265->sps[current->active_seq_parameter_set_id[current->layer_sps_idx[0]]];
1898     }
1899
1900     return 0;
1901 }
1902
1903 static int FUNC(sei_decoded_picture_hash)
1904     (CodedBitstreamContext *ctx, RWContext *rw,
1905      H265RawSEIDecodedPictureHash *current, SEIMessageState *sei)
1906 {
1907     CodedBitstreamH265Context *h265 = ctx->priv_data;
1908     const H265RawSPS *sps = h265->active_sps;
1909     int err, c, i;
1910
1911     HEADER("Decoded Picture Hash");
1912
1913     if (!sps) {
1914         av_log(ctx->log_ctx, AV_LOG_ERROR,
1915                "No active SPS for decoded picture hash.\n");
1916         return AVERROR_INVALIDDATA;
1917     }
1918
1919     u(8, hash_type, 0, 2);
1920
1921     for (c = 0; c < (sps->chroma_format_idc == 0 ? 1 : 3); c++) {
1922         if (current->hash_type == 0) {
1923             for (i = 0; i < 16; i++)
1924                 us(8, picture_md5[c][i], 0x00, 0xff, 2, c, i);
1925         } else if (current->hash_type == 1) {
1926             us(16, picture_crc[c], 0x0000, 0xffff, 1, c);
1927         } else if (current->hash_type == 2) {
1928             us(32, picture_checksum[c], 0x00000000, 0xffffffff, 1, c);
1929         }
1930     }
1931
1932     return 0;
1933 }
1934
1935 static int FUNC(sei_time_code)
1936     (CodedBitstreamContext *ctx, RWContext *rw,
1937      H265RawSEITimeCode *current, SEIMessageState *sei)
1938 {
1939     int err, i;
1940
1941     HEADER("Time Code");
1942
1943     u(2, num_clock_ts, 1, 3);
1944
1945     for (i = 0; i < current->num_clock_ts; i++) {
1946         flags(clock_timestamp_flag[i],   1, i);
1947
1948         if (current->clock_timestamp_flag[i]) {
1949             flags(units_field_based_flag[i], 1, i);
1950             us(5, counting_type[i], 0, 6,    1, i);
1951             flags(full_timestamp_flag[i],    1, i);
1952             flags(discontinuity_flag[i],     1, i);
1953             flags(cnt_dropped_flag[i],       1, i);
1954
1955             ubs(9, n_frames[i], 1, i);
1956
1957             if (current->full_timestamp_flag[i]) {
1958                 us(6, seconds_value[i], 0, 59, 1, i);
1959                 us(6, minutes_value[i], 0, 59, 1, i);
1960                 us(5, hours_value[i],   0, 23, 1, i);
1961             } else {
1962                 flags(seconds_flag[i], 1, i);
1963                 if (current->seconds_flag[i]) {
1964                     us(6, seconds_value[i], 0, 59, 1, i);
1965                     flags(minutes_flag[i], 1, i);
1966                     if (current->minutes_flag[i]) {
1967                         us(6, minutes_value[i], 0, 59, 1, i);
1968                         flags(hours_flag[i], 1, i);
1969                         if (current->hours_flag[i])
1970                             us(5, hours_value[i], 0, 23, 1, i);
1971                     }
1972                 }
1973             }
1974
1975             ubs(5, time_offset_length[i], 1, i);
1976             if (current->time_offset_length[i] > 0)
1977                 ibs(current->time_offset_length[i], time_offset_value[i], 1, i);
1978             else
1979                 infer(time_offset_value[i], 0);
1980         }
1981     }
1982
1983     return 0;
1984 }
1985
1986 static int FUNC(sei_alpha_channel_info)
1987     (CodedBitstreamContext *ctx, RWContext *rw,
1988      H265RawSEIAlphaChannelInfo *current, SEIMessageState *sei)
1989 {
1990     int err, length;
1991
1992     HEADER("Alpha Channel Information");
1993
1994     flag(alpha_channel_cancel_flag);
1995     if (!current->alpha_channel_cancel_flag) {
1996         ub(3, alpha_channel_use_idc);
1997         ub(3, alpha_channel_bit_depth_minus8);
1998         length = current->alpha_channel_bit_depth_minus8 + 9;
1999         ub(length, alpha_transparent_value);
2000         ub(length, alpha_opaque_value);
2001         flag(alpha_channel_incr_flag);
2002         flag(alpha_channel_clip_flag);
2003         if (current->alpha_channel_clip_flag)
2004             flag(alpha_channel_clip_type_flag);
2005     } else {
2006        infer(alpha_channel_use_idc,   2);
2007        infer(alpha_channel_incr_flag, 0);
2008        infer(alpha_channel_clip_flag, 0);
2009     }
2010
2011     return 0;
2012 }
2013
2014 static int FUNC(sei)(CodedBitstreamContext *ctx, RWContext *rw,
2015                      H265RawSEI *current, int prefix)
2016 {
2017     int err;
2018
2019     if (prefix)
2020         HEADER("Prefix Supplemental Enhancement Information");
2021     else
2022         HEADER("Suffix Supplemental Enhancement Information");
2023
2024     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,
2025                                 prefix ? HEVC_NAL_SEI_PREFIX
2026                                        : HEVC_NAL_SEI_SUFFIX));
2027
2028     CHECK(FUNC_SEI(message_list)(ctx, rw, &current->message_list, prefix));
2029
2030     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
2031
2032     return 0;
2033 }