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                                 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, 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), 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;
 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
 542         flag(delta_rps_sign);
 543         ue(abs_delta_rps_minus1, 0, INT16_MAX);
 544         delta_rps = (1 - 2 * current->delta_rps_sign) *
 545             (current->abs_delta_rps_minus1 + 1);
 546
 547         for (j = 0; j <= num_delta_pocs; j++) {
 548             flags(used_by_curr_pic_flag[j], 1, j);
 549             if (!current->used_by_curr_pic_flag[j])
 550                 flags(use_delta_flag[j], 1, j);
 551             else
 552                 infer(use_delta_flag[j], 1);
 553         }
 554
 555         // Since the stored form of an RPS here is actually the delta-step
 556         // form used when inter_ref_pic_set_prediction_flag is not set, we
 557         // need to reconstruct that here in order to be able to refer to
 558         // the RPS later (which is required for parsing, because we don't
 559         // even know what syntax elements appear without it).  Therefore,
 560         // this code takes the delta-step form of the reference set, turns
 561         // it into the delta-array form, applies the prediction process of
 562         // 7.4.8, converts the result back to the delta-step form, and
 563         // stores that as the current set for future use.  Note that the
 564         // inferences here mean that writers using prediction will need
 565         // to fill in the delta-step values correctly as well - since the
 566         // whole RPS prediction process is somewhat overly sophisticated,
 567         // this hopefully forms a useful check for them to ensure their
 568         // predicted form actually matches what was intended rather than
 569         // an onerous additional requirement.
 570
 571         d_poc = 0;
 572         for (i = 0; i < ref->num_negative_pics; i++) {
 573             d_poc -= ref->delta_poc_s0_minus1[i] + 1;
 574             ref_delta_poc_s0[i] = d_poc;
 575         }
 576         d_poc = 0;
 577         for (i = 0; i < ref->num_positive_pics; i++) {
 578             d_poc += ref->delta_poc_s1_minus1[i] + 1;
 579             ref_delta_poc_s1[i] = d_poc;
 580         }
 581
 582         i = 0;
 583         for (j = ref->num_positive_pics - 1; j >= 0; j--) {
 584             d_poc = ref_delta_poc_s1[j] + delta_rps;
 585             if (d_poc < 0 && current->use_delta_flag[ref->num_negative_pics + j]) {
 586                 delta_poc_s0[i] = d_poc;
 587                 used_by_curr_pic_s0[i++] =
 588                     current->used_by_curr_pic_flag[ref->num_negative_pics + j];
 589             }
 590         }
 591         if (delta_rps < 0 && current->use_delta_flag[num_delta_pocs]) {
 592             delta_poc_s0[i] = delta_rps;
 593             used_by_curr_pic_s0[i++] =
 594                 current->used_by_curr_pic_flag[num_delta_pocs];
 595         }
 596         for (j = 0; j < ref->num_negative_pics; j++) {
 597             d_poc = ref_delta_poc_s0[j] + delta_rps;
 598             if (d_poc < 0 && current->use_delta_flag[j]) {
 599                 delta_poc_s0[i] = d_poc;
 600                 used_by_curr_pic_s0[i++] = current->used_by_curr_pic_flag[j];
 601             }
 602         }
 603
 604         infer(num_negative_pics, i);
 605         for (i = 0; i < current->num_negative_pics; i++) {
 606             infer(delta_poc_s0_minus1[i],
 607                   -(delta_poc_s0[i] - (i == 0 ? 0 : delta_poc_s0[i - 1])) - 1);
 608             infer(used_by_curr_pic_s0_flag[i], used_by_curr_pic_s0[i]);
 609         }
 610
 611         i = 0;
 612         for (j = ref->num_negative_pics - 1; j >= 0; j--) {
 613             d_poc = ref_delta_poc_s0[j] + delta_rps;
 614             if (d_poc > 0 && current->use_delta_flag[j]) {
 615                 delta_poc_s1[i] = d_poc;
 616                 used_by_curr_pic_s1[i++] = current->used_by_curr_pic_flag[j];
 617             }
 618         }
 619         if (delta_rps > 0 && current->use_delta_flag[num_delta_pocs]) {
 620             delta_poc_s1[i] = delta_rps;
 621             used_by_curr_pic_s1[i++] =
 622                 current->used_by_curr_pic_flag[num_delta_pocs];
 623         }
 624         for (j = 0; j < ref->num_positive_pics; j++) {
 625             d_poc = ref_delta_poc_s1[j] + delta_rps;
 626             if (d_poc > 0 && current->use_delta_flag[ref->num_negative_pics + j]) {
 627                 delta_poc_s1[i] = d_poc;
 628                 used_by_curr_pic_s1[i++] =
 629                     current->used_by_curr_pic_flag[ref->num_negative_pics + j];
 630             }
 631         }
 632
 633         infer(num_positive_pics, i);
 634         for (i = 0; i < current->num_positive_pics; i++) {
 635             infer(delta_poc_s1_minus1[i],
 636                   delta_poc_s1[i] - (i == 0 ? 0 : delta_poc_s1[i - 1]) - 1);
 637             infer(used_by_curr_pic_s1_flag[i], used_by_curr_pic_s1[i]);
 638         }
 639
 640     } else {
 641         ue(num_negative_pics, 0, 15);
 642         ue(num_positive_pics, 0, 15 - current->num_negative_pics);
 643
 644         for (i = 0; i < current->num_negative_pics; i++) {
 645             ues(delta_poc_s0_minus1[i], 0, INT16_MAX, 1, i);
 646             flags(used_by_curr_pic_s0_flag[i],        1, i);
 647         }
 648
 649         for (i = 0; i < current->num_positive_pics; i++) {
 650             ues(delta_poc_s1_minus1[i], 0, INT16_MAX, 1, i);
 651             flags(used_by_curr_pic_s1_flag[i],        1, i);
 652         }
 653     }
 654
 655     return 0;
 656 }
 657
 658 static int FUNC(scaling_list_data)(CodedBitstreamContext *ctx, RWContext *rw,
 659                                    H265RawScalingList *current)
 660 {
 661     int sizeId, matrixId;
 662     int err, n, i;
 663
 664     for (sizeId = 0; sizeId < 4; sizeId++) {
 665         for (matrixId = 0; matrixId < 6; matrixId += (sizeId == 3 ? 3 : 1)) {
 666             flags(scaling_list_pred_mode_flag[sizeId][matrixId],
 667                   2, sizeId, matrixId);
 668             if (!current->scaling_list_pred_mode_flag[sizeId][matrixId]) {
 669                 ues(scaling_list_pred_matrix_id_delta[sizeId][matrixId],
 670                     0, sizeId == 3 ? matrixId / 3 : matrixId,
 671                     2, sizeId, matrixId);
 672             } else {
 673                 n = FFMIN(64, 1 << (4 + (sizeId << 1)));
 674                 if (sizeId > 1) {
 675                     ses(scaling_list_dc_coef_minus8[sizeId - 2][matrixId], -7, +247,
 676                         2, sizeId - 2, matrixId);
 677                 }
 678                 for (i = 0; i < n; i++) {
 679                     ses(scaling_list_delta_coeff[sizeId][matrixId][i],
 680                         -128, +127, 3, sizeId, matrixId, i);
 681                 }
 682             }
 683         }
 684     }
 685
 686     return 0;
 687 }
 688
 689 static int FUNC(sps_range_extension)(CodedBitstreamContext *ctx, RWContext *rw,
 690                                      H265RawSPS *current)
 691 {
 692     int err;
 693
 694     flag(transform_skip_rotation_enabled_flag);
 695     flag(transform_skip_context_enabled_flag);
 696     flag(implicit_rdpcm_enabled_flag);
 697     flag(explicit_rdpcm_enabled_flag);
 698     flag(extended_precision_processing_flag);
 699     flag(intra_smoothing_disabled_flag);
 700     flag(high_precision_offsets_enabled_flag);
 701     flag(persistent_rice_adaptation_enabled_flag);
 702     flag(cabac_bypass_alignment_enabled_flag);
 703
 704     return 0;
 705 }
 706
 707 static int FUNC(sps_scc_extension)(CodedBitstreamContext *ctx, RWContext *rw,
 708                                    H265RawSPS *current)
 709 {
 710     int err, comp, i;
 711
 712     flag(sps_curr_pic_ref_enabled_flag);
 713
 714     flag(palette_mode_enabled_flag);
 715     if (current->palette_mode_enabled_flag) {
 716         ue(palette_max_size, 0, 64);
 717         ue(delta_palette_max_predictor_size, 0, 128);
 718
 719         flag(sps_palette_predictor_initializer_present_flag);
 720         if (current->sps_palette_predictor_initializer_present_flag) {
 721             ue(sps_num_palette_predictor_initializer_minus1, 0, 128);
 722             for (comp = 0; comp < (current->chroma_format_idc ? 3 : 1); comp++) {
 723                 int bit_depth = comp == 0 ? current->bit_depth_luma_minus8 + 8
 724                                           : current->bit_depth_chroma_minus8 + 8;
 725                 for (i = 0; i <= current->sps_num_palette_predictor_initializer_minus1; i++)
 726                     ubs(bit_depth, sps_palette_predictor_initializers[comp][i], 2, comp, i);
 727             }
 728         }
 729     }
 730
 731     u(2, motion_vector_resolution_control_idc, 0, 2);
 732     flag(intra_boundary_filtering_disable_flag);
 733
 734     return 0;
 735 }
 736
 737 static int FUNC(sps)(CodedBitstreamContext *ctx, RWContext *rw,
 738                      H265RawSPS *current)
 739 {
 740     CodedBitstreamH265Context *h265 = ctx->priv_data;
 741     const H265RawVPS *vps;
 742     int err, i;
 743     unsigned int min_cb_log2_size_y, ctb_log2_size_y,
 744                  min_cb_size_y,   min_tb_log2_size_y;
 745
 746     HEADER("Sequence Parameter Set");
 747
 748     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, HEVC_NAL_SPS));
 749
 750     ub(4, sps_video_parameter_set_id);
 751     h265->active_vps = vps = h265->vps[current->sps_video_parameter_set_id];
 752
 753     u(3, sps_max_sub_layers_minus1, 0, HEVC_MAX_SUB_LAYERS - 1);
 754     flag(sps_temporal_id_nesting_flag);
 755     if (vps) {
 756         if (vps->vps_max_sub_layers_minus1 > current->sps_max_sub_layers_minus1) {
 757             av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid stream: "
 758                    "sps_max_sub_layers_minus1 (%d) must be less than or equal to "
 759                    "vps_max_sub_layers_minus1 (%d).\n",
 760                    vps->vps_max_sub_layers_minus1,
 761                    current->sps_max_sub_layers_minus1);
 762             return AVERROR_INVALIDDATA;
 763         }
 764         if (vps->vps_temporal_id_nesting_flag &&
 765             !current->sps_temporal_id_nesting_flag) {
 766             av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid stream: "
 767                    "sps_temporal_id_nesting_flag must be 1 if "
 768                    "vps_temporal_id_nesting_flag is 1.\n");
 769             return AVERROR_INVALIDDATA;
 770         }
 771     }
 772
 773     CHECK(FUNC(profile_tier_level)(ctx, rw, &current->profile_tier_level,
 774                                    1, current->sps_max_sub_layers_minus1));
 775
 776     ue(sps_seq_parameter_set_id, 0, 15);
 777
 778     ue(chroma_format_idc, 0, 3);
 779     if (current->chroma_format_idc == 3)
 780         flag(separate_colour_plane_flag);
 781     else
 782         infer(separate_colour_plane_flag, 0);
 783
 784     ue(pic_width_in_luma_samples,  1, HEVC_MAX_WIDTH);
 785     ue(pic_height_in_luma_samples, 1, HEVC_MAX_HEIGHT);
 786
 787     flag(conformance_window_flag);
 788     if (current->conformance_window_flag) {
 789         ue(conf_win_left_offset,   0, current->pic_width_in_luma_samples);
 790         ue(conf_win_right_offset,  0, current->pic_width_in_luma_samples);
 791         ue(conf_win_top_offset,    0, current->pic_height_in_luma_samples);
 792         ue(conf_win_bottom_offset, 0, current->pic_height_in_luma_samples);
 793     } else {
 794         infer(conf_win_left_offset,   0);
 795         infer(conf_win_right_offset,  0);
 796         infer(conf_win_top_offset,    0);
 797         infer(conf_win_bottom_offset, 0);
 798     }
 799
 800     ue(bit_depth_luma_minus8,   0, 8);
 801     ue(bit_depth_chroma_minus8, 0, 8);
 802
 803     ue(log2_max_pic_order_cnt_lsb_minus4, 0, 12);
 804
 805     flag(sps_sub_layer_ordering_info_present_flag);
 806     for (i = (current->sps_sub_layer_ordering_info_present_flag ?
 807               0 : current->sps_max_sub_layers_minus1);
 808          i <= current->sps_max_sub_layers_minus1; i++) {
 809         ues(sps_max_dec_pic_buffering_minus1[i],
 810             0, HEVC_MAX_DPB_SIZE - 1,                        1, i);
 811         ues(sps_max_num_reorder_pics[i],
 812             0, current->sps_max_dec_pic_buffering_minus1[i], 1, i);
 813         ues(sps_max_latency_increase_plus1[i],
 814             0, UINT32_MAX - 1,                               1, i);
 815     }
 816     if (!current->sps_sub_layer_ordering_info_present_flag) {
 817         for (i = 0; i < current->sps_max_sub_layers_minus1; i++) {
 818             infer(sps_max_dec_pic_buffering_minus1[i],
 819                   current->sps_max_dec_pic_buffering_minus1[current->sps_max_sub_layers_minus1]);
 820             infer(sps_max_num_reorder_pics[i],
 821                   current->sps_max_num_reorder_pics[current->sps_max_sub_layers_minus1]);
 822             infer(sps_max_latency_increase_plus1[i],
 823                   current->sps_max_latency_increase_plus1[current->sps_max_sub_layers_minus1]);
 824         }
 825     }
 826
 827     ue(log2_min_luma_coding_block_size_minus3,   0, 3);
 828     min_cb_log2_size_y = current->log2_min_luma_coding_block_size_minus3 + 3;
 829
 830     ue(log2_diff_max_min_luma_coding_block_size, 0, 3);
 831     ctb_log2_size_y = min_cb_log2_size_y +
 832         current->log2_diff_max_min_luma_coding_block_size;
 833
 834     min_cb_size_y = 1 << min_cb_log2_size_y;
 835     if (current->pic_width_in_luma_samples  % min_cb_size_y ||
 836         current->pic_height_in_luma_samples % min_cb_size_y) {
 837         av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid dimensions: %ux%u not divisible "
 838                "by MinCbSizeY = %u.\n", current->pic_width_in_luma_samples,
 839                current->pic_height_in_luma_samples, min_cb_size_y);
 840         return AVERROR_INVALIDDATA;
 841     }
 842
 843     ue(log2_min_luma_transform_block_size_minus2, 0, min_cb_log2_size_y - 3);
 844     min_tb_log2_size_y = current->log2_min_luma_transform_block_size_minus2 + 2;
 845
 846     ue(log2_diff_max_min_luma_transform_block_size,
 847        0, FFMIN(ctb_log2_size_y, 5) - min_tb_log2_size_y);
 848
 849     ue(max_transform_hierarchy_depth_inter,
 850        0, ctb_log2_size_y - min_tb_log2_size_y);
 851     ue(max_transform_hierarchy_depth_intra,
 852        0, ctb_log2_size_y - min_tb_log2_size_y);
 853
 854     flag(scaling_list_enabled_flag);
 855     if (current->scaling_list_enabled_flag) {
 856         flag(sps_scaling_list_data_present_flag);
 857         if (current->sps_scaling_list_data_present_flag)
 858             CHECK(FUNC(scaling_list_data)(ctx, rw, &current->scaling_list));
 859     } else {
 860         infer(sps_scaling_list_data_present_flag, 0);
 861     }
 862
 863     flag(amp_enabled_flag);
 864     flag(sample_adaptive_offset_enabled_flag);
 865
 866     flag(pcm_enabled_flag);
 867     if (current->pcm_enabled_flag) {
 868         u(4, pcm_sample_bit_depth_luma_minus1,
 869           0, current->bit_depth_luma_minus8 + 8 - 1);
 870         u(4, pcm_sample_bit_depth_chroma_minus1,
 871           0, current->bit_depth_chroma_minus8 + 8 - 1);
 872
 873         ue(log2_min_pcm_luma_coding_block_size_minus3,
 874            FFMIN(min_cb_log2_size_y, 5) - 3, FFMIN(ctb_log2_size_y, 5) - 3);
 875         ue(log2_diff_max_min_pcm_luma_coding_block_size,
 876            0, FFMIN(ctb_log2_size_y, 5) - (current->log2_min_pcm_luma_coding_block_size_minus3 + 3));
 877
 878         flag(pcm_loop_filter_disabled_flag);
 879     }
 880
 881     ue(num_short_term_ref_pic_sets, 0, HEVC_MAX_SHORT_TERM_REF_PIC_SETS);
 882     for (i = 0; i < current->num_short_term_ref_pic_sets; i++)
 883         CHECK(FUNC(st_ref_pic_set)(ctx, rw, &current->st_ref_pic_set[i], i, current));
 884
 885     flag(long_term_ref_pics_present_flag);
 886     if (current->long_term_ref_pics_present_flag) {
 887         ue(num_long_term_ref_pics_sps, 0, HEVC_MAX_LONG_TERM_REF_PICS);
 888         for (i = 0; i < current->num_long_term_ref_pics_sps; i++) {
 889             ubs(current->log2_max_pic_order_cnt_lsb_minus4 + 4,
 890                 lt_ref_pic_poc_lsb_sps[i], 1, i);
 891             flags(used_by_curr_pic_lt_sps_flag[i], 1, i);
 892         }
 893     }
 894
 895     flag(sps_temporal_mvp_enabled_flag);
 896     flag(strong_intra_smoothing_enabled_flag);
 897
 898     flag(vui_parameters_present_flag);
 899     if (current->vui_parameters_present_flag)
 900         CHECK(FUNC(vui_parameters)(ctx, rw, &current->vui, current));
 901
 902     flag(sps_extension_present_flag);
 903     if (current->sps_extension_present_flag) {
 904         flag(sps_range_extension_flag);
 905         flag(sps_multilayer_extension_flag);
 906         flag(sps_3d_extension_flag);
 907         flag(sps_scc_extension_flag);
 908         ub(4, sps_extension_4bits);
 909     }
 910
 911     if (current->sps_range_extension_flag)
 912         CHECK(FUNC(sps_range_extension)(ctx, rw, current));
 913     if (current->sps_multilayer_extension_flag)
 914         return AVERROR_PATCHWELCOME;
 915     if (current->sps_3d_extension_flag)
 916         return AVERROR_PATCHWELCOME;
 917     if (current->sps_scc_extension_flag)
 918         CHECK(FUNC(sps_scc_extension)(ctx, rw, current));
 919     if (current->sps_extension_4bits)
 920         CHECK(FUNC(extension_data)(ctx, rw, &current->extension_data));
 921
 922     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
 923
 924     return 0;
 925 }
 926
 927 static int FUNC(pps_range_extension)(CodedBitstreamContext *ctx, RWContext *rw,
 928                                      H265RawPPS *current)
 929 {
 930     CodedBitstreamH265Context *h265 = ctx->priv_data;
 931     const H265RawSPS *sps = h265->active_sps;
 932     int err, i;
 933
 934     if (current->transform_skip_enabled_flag)
 935         ue(log2_max_transform_skip_block_size_minus2, 0, 3);
 936     flag(cross_component_prediction_enabled_flag);
 937
 938     flag(chroma_qp_offset_list_enabled_flag);
 939     if (current->chroma_qp_offset_list_enabled_flag) {
 940         ue(diff_cu_chroma_qp_offset_depth,
 941            0, sps->log2_diff_max_min_luma_coding_block_size);
 942         ue(chroma_qp_offset_list_len_minus1, 0, 5);
 943         for (i = 0; i <= current->chroma_qp_offset_list_len_minus1; i++) {
 944             ses(cb_qp_offset_list[i], -12, +12, 1, i);
 945             ses(cr_qp_offset_list[i], -12, +12, 1, i);
 946         }
 947     }
 948
 949     ue(log2_sao_offset_scale_luma,   0, FFMAX(0, sps->bit_depth_luma_minus8   - 2));
 950     ue(log2_sao_offset_scale_chroma, 0, FFMAX(0, sps->bit_depth_chroma_minus8 - 2));
 951
 952     return 0;
 953 }
 954
 955 static int FUNC(pps_scc_extension)(CodedBitstreamContext *ctx, RWContext *rw,
 956                                    H265RawPPS *current)
 957 {
 958     int err, comp, i;
 959
 960     flag(pps_curr_pic_ref_enabled_flag);
 961
 962     flag(residual_adaptive_colour_transform_enabled_flag);
 963     if (current->residual_adaptive_colour_transform_enabled_flag) {
 964         flag(pps_slice_act_qp_offsets_present_flag);
 965         se(pps_act_y_qp_offset_plus5,  -7, +17);
 966         se(pps_act_cb_qp_offset_plus5, -7, +17);
 967         se(pps_act_cr_qp_offset_plus3, -9, +15);
 968     } else {
 969         infer(pps_slice_act_qp_offsets_present_flag, 0);
 970         infer(pps_act_y_qp_offset_plus5,  0);
 971         infer(pps_act_cb_qp_offset_plus5, 0);
 972         infer(pps_act_cr_qp_offset_plus3, 0);
 973     }
 974
 975     flag(pps_palette_predictor_initializer_present_flag);
 976     if (current->pps_palette_predictor_initializer_present_flag) {
 977         ue(pps_num_palette_predictor_initializer, 0, 128);
 978         if (current->pps_num_palette_predictor_initializer > 0) {
 979             flag(monochrome_palette_flag);
 980             ue(luma_bit_depth_entry_minus8, 0, 8);
 981             if (!current->monochrome_palette_flag)
 982                 ue(chroma_bit_depth_entry_minus8, 0, 8);
 983             for (comp = 0; comp < (current->monochrome_palette_flag ? 1 : 3); comp++) {
 984                 int bit_depth = comp == 0 ? current->luma_bit_depth_entry_minus8 + 8
 985                                           : current->chroma_bit_depth_entry_minus8 + 8;
 986                 for (i = 0; i < current->pps_num_palette_predictor_initializer; i++)
 987                     ubs(bit_depth, pps_palette_predictor_initializers[comp][i], 2, comp, i);
 988             }
 989         }
 990     }
 991
 992     return 0;
 993 }
 994
 995 static int FUNC(pps)(CodedBitstreamContext *ctx, RWContext *rw,
 996                      H265RawPPS *current)
 997 {
 998     CodedBitstreamH265Context *h265 = ctx->priv_data;
 999     const H265RawSPS *sps;
1000     int err, i;
1001
1002     HEADER("Picture Parameter Set");
1003
1004     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, HEVC_NAL_PPS));
1005
1006     ue(pps_pic_parameter_set_id, 0, 63);
1007     ue(pps_seq_parameter_set_id, 0, 15);
1008     sps = h265->sps[current->pps_seq_parameter_set_id];
1009     if (!sps) {
1010         av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",
1011                current->pps_seq_parameter_set_id);
1012         return AVERROR_INVALIDDATA;
1013     }
1014     h265->active_sps = sps;
1015
1016     flag(dependent_slice_segments_enabled_flag);
1017     flag(output_flag_present_flag);
1018     ub(3, num_extra_slice_header_bits);
1019     flag(sign_data_hiding_enabled_flag);
1020     flag(cabac_init_present_flag);
1021
1022     ue(num_ref_idx_l0_default_active_minus1, 0, 14);
1023     ue(num_ref_idx_l1_default_active_minus1, 0, 14);
1024
1025     se(init_qp_minus26, -(26 + 6 * sps->bit_depth_luma_minus8), +25);
1026
1027     flag(constrained_intra_pred_flag);
1028     flag(transform_skip_enabled_flag);
1029     flag(cu_qp_delta_enabled_flag);
1030     if (current->cu_qp_delta_enabled_flag)
1031         ue(diff_cu_qp_delta_depth,
1032            0, sps->log2_diff_max_min_luma_coding_block_size);
1033     else
1034         infer(diff_cu_qp_delta_depth, 0);
1035
1036     se(pps_cb_qp_offset, -12, +12);
1037     se(pps_cr_qp_offset, -12, +12);
1038     flag(pps_slice_chroma_qp_offsets_present_flag);
1039
1040     flag(weighted_pred_flag);
1041     flag(weighted_bipred_flag);
1042
1043     flag(transquant_bypass_enabled_flag);
1044     flag(tiles_enabled_flag);
1045     flag(entropy_coding_sync_enabled_flag);
1046
1047     if (current->tiles_enabled_flag) {
1048         ue(num_tile_columns_minus1, 0, HEVC_MAX_TILE_COLUMNS);
1049         ue(num_tile_rows_minus1,    0, HEVC_MAX_TILE_ROWS);
1050         flag(uniform_spacing_flag);
1051         if (!current->uniform_spacing_flag) {
1052             for (i = 0; i < current->num_tile_columns_minus1; i++)
1053                 ues(column_width_minus1[i], 0, sps->pic_width_in_luma_samples,  1, i);
1054             for (i = 0; i < current->num_tile_rows_minus1; i++)
1055                 ues(row_height_minus1[i],   0, sps->pic_height_in_luma_samples, 1, i);
1056         }
1057         flag(loop_filter_across_tiles_enabled_flag);
1058     } else {
1059         infer(num_tile_columns_minus1, 0);
1060         infer(num_tile_rows_minus1,    0);
1061     }
1062
1063     flag(pps_loop_filter_across_slices_enabled_flag);
1064     flag(deblocking_filter_control_present_flag);
1065     if (current->deblocking_filter_control_present_flag) {
1066         flag(deblocking_filter_override_enabled_flag);
1067         flag(pps_deblocking_filter_disabled_flag);
1068         if (!current->pps_deblocking_filter_disabled_flag) {
1069             se(pps_beta_offset_div2, -6, +6);
1070             se(pps_tc_offset_div2,   -6, +6);
1071         } else {
1072             infer(pps_beta_offset_div2, 0);
1073             infer(pps_tc_offset_div2,   0);
1074         }
1075     } else {
1076         infer(deblocking_filter_override_enabled_flag, 0);
1077         infer(pps_deblocking_filter_disabled_flag,     0);
1078         infer(pps_beta_offset_div2, 0);
1079         infer(pps_tc_offset_div2,   0);
1080     }
1081
1082     flag(pps_scaling_list_data_present_flag);
1083     if (current->pps_scaling_list_data_present_flag)
1084         CHECK(FUNC(scaling_list_data)(ctx, rw, &current->scaling_list));
1085
1086     flag(lists_modification_present_flag);
1087
1088     ue(log2_parallel_merge_level_minus2,
1089        0, (sps->log2_min_luma_coding_block_size_minus3 + 3 +
1090            sps->log2_diff_max_min_luma_coding_block_size - 2));
1091
1092     flag(slice_segment_header_extension_present_flag);
1093
1094     flag(pps_extension_present_flag);
1095     if (current->pps_extension_present_flag) {
1096         flag(pps_range_extension_flag);
1097         flag(pps_multilayer_extension_flag);
1098         flag(pps_3d_extension_flag);
1099         flag(pps_scc_extension_flag);
1100         ub(4, pps_extension_4bits);
1101     }
1102     if (current->pps_range_extension_flag)
1103         CHECK(FUNC(pps_range_extension)(ctx, rw, current));
1104     if (current->pps_multilayer_extension_flag)
1105         return AVERROR_PATCHWELCOME;
1106     if (current->pps_3d_extension_flag)
1107         return AVERROR_PATCHWELCOME;
1108     if (current->pps_scc_extension_flag)
1109         CHECK(FUNC(pps_scc_extension)(ctx, rw, current));
1110     if (current->pps_extension_4bits)
1111         CHECK(FUNC(extension_data)(ctx, rw, &current->extension_data));
1112
1113     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
1114
1115     return 0;
1116 }
1117
1118 static int FUNC(aud)(CodedBitstreamContext *ctx, RWContext *rw,
1119                      H265RawAUD *current)
1120 {
1121     int err;
1122
1123     HEADER("Access Unit Delimiter");
1124
1125     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, HEVC_NAL_AUD));
1126
1127     u(3, pic_type, 0, 2);
1128
1129     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
1130
1131     return 0;
1132 }
1133
1134 static int FUNC(ref_pic_lists_modification)(CodedBitstreamContext *ctx, RWContext *rw,
1135                                             H265RawSliceHeader *current,
1136                                             unsigned int num_pic_total_curr)
1137 {
1138     unsigned int entry_size;
1139     int err, i;
1140
1141     entry_size = av_log2(num_pic_total_curr - 1) + 1;
1142
1143     flag(ref_pic_list_modification_flag_l0);
1144     if (current->ref_pic_list_modification_flag_l0) {
1145         for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++)
1146             us(entry_size, list_entry_l0[i], 0, num_pic_total_curr - 1, 1, i);
1147     }
1148
1149     if (current->slice_type == HEVC_SLICE_B) {
1150         flag(ref_pic_list_modification_flag_l1);
1151         if (current->ref_pic_list_modification_flag_l1) {
1152             for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++)
1153                 us(entry_size, list_entry_l1[i], 0, num_pic_total_curr - 1, 1, i);
1154         }
1155     }
1156
1157     return 0;
1158 }
1159
1160 static int FUNC(pred_weight_table)(CodedBitstreamContext *ctx, RWContext *rw,
1161                                    H265RawSliceHeader *current)
1162 {
1163     CodedBitstreamH265Context *h265 = ctx->priv_data;
1164     const H265RawSPS *sps = h265->active_sps;
1165     int err, i, j;
1166     int chroma = !sps->separate_colour_plane_flag &&
1167                   sps->chroma_format_idc != 0;
1168
1169     ue(luma_log2_weight_denom, 0, 7);
1170     if (chroma)
1171         se(delta_chroma_log2_weight_denom, -7, 7);
1172     else
1173         infer(delta_chroma_log2_weight_denom, 0);
1174
1175     for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++) {
1176         if (1 /* is not same POC and same layer_id */)
1177             flags(luma_weight_l0_flag[i], 1, i);
1178         else
1179             infer(luma_weight_l0_flag[i], 0);
1180     }
1181     if (chroma) {
1182         for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++) {
1183             if (1 /* is not same POC and same layer_id */)
1184                 flags(chroma_weight_l0_flag[i], 1, i);
1185             else
1186                 infer(chroma_weight_l0_flag[i], 0);
1187         }
1188     }
1189
1190     for (i = 0; i <= current->num_ref_idx_l0_active_minus1; i++) {
1191         if (current->luma_weight_l0_flag[i]) {
1192             ses(delta_luma_weight_l0[i], -128, +127, 1, i);
1193             ses(luma_offset_l0[i],
1194                 -(1 << (sps->bit_depth_luma_minus8 + 8 - 1)),
1195                 ((1 << (sps->bit_depth_luma_minus8 + 8 - 1)) - 1), 1, i);
1196         } else {
1197             infer(delta_luma_weight_l0[i], 0);
1198             infer(luma_offset_l0[i],       0);
1199         }
1200         if (current->chroma_weight_l0_flag[i]) {
1201             for (j = 0; j < 2; j++) {
1202                 ses(delta_chroma_weight_l0[i][j], -128, +127, 2, i, j);
1203                 ses(chroma_offset_l0[i][j],
1204                     -(4 << (sps->bit_depth_chroma_minus8 + 8 - 1)),
1205                     ((4 << (sps->bit_depth_chroma_minus8 + 8 - 1)) - 1), 2, i, j);
1206             }
1207         } else {
1208             for (j = 0; j < 2; j++) {
1209                 infer(delta_chroma_weight_l0[i][j], 0);
1210                 infer(chroma_offset_l0[i][j],       0);
1211             }
1212         }
1213     }
1214
1215     if (current->slice_type == HEVC_SLICE_B) {
1216         for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++) {
1217             if (1 /* RefPicList1[i] is not CurrPic, nor is it in a different layer */)
1218                 flags(luma_weight_l1_flag[i], 1, i);
1219             else
1220                 infer(luma_weight_l1_flag[i], 0);
1221         }
1222         if (chroma) {
1223             for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++) {
1224                 if (1 /* RefPicList1[i] is not CurrPic, nor is it in a different layer */)
1225                     flags(chroma_weight_l1_flag[i], 1, i);
1226                 else
1227                     infer(chroma_weight_l1_flag[i], 0);
1228             }
1229         }
1230
1231         for (i = 0; i <= current->num_ref_idx_l1_active_minus1; i++) {
1232             if (current->luma_weight_l1_flag[i]) {
1233                 ses(delta_luma_weight_l1[i], -128, +127, 1, i);
1234                 ses(luma_offset_l1[i],
1235                     -(1 << (sps->bit_depth_luma_minus8 + 8 - 1)),
1236                     ((1 << (sps->bit_depth_luma_minus8 + 8 - 1)) - 1), 1, i);
1237             } else {
1238                 infer(delta_luma_weight_l1[i], 0);
1239                 infer(luma_offset_l1[i],       0);
1240             }
1241             if (current->chroma_weight_l1_flag[i]) {
1242                 for (j = 0; j < 2; j++) {
1243                     ses(delta_chroma_weight_l1[i][j], -128, +127, 2, i, j);
1244                     ses(chroma_offset_l1[i][j],
1245                         -(4 << (sps->bit_depth_chroma_minus8 + 8 - 1)),
1246                         ((4 << (sps->bit_depth_chroma_minus8 + 8 - 1)) - 1), 2, i, j);
1247                 }
1248             } else {
1249                 for (j = 0; j < 2; j++) {
1250                     infer(delta_chroma_weight_l1[i][j], 0);
1251                     infer(chroma_offset_l1[i][j],       0);
1252                 }
1253             }
1254         }
1255     }
1256
1257     return 0;
1258 }
1259
1260 static int FUNC(slice_segment_header)(CodedBitstreamContext *ctx, RWContext *rw,
1261                                       H265RawSliceHeader *current)
1262 {
1263     CodedBitstreamH265Context *h265 = ctx->priv_data;
1264     const H265RawSPS *sps;
1265     const H265RawPPS *pps;
1266     unsigned int min_cb_log2_size_y, ctb_log2_size_y, ctb_size_y;
1267     unsigned int pic_width_in_ctbs_y, pic_height_in_ctbs_y, pic_size_in_ctbs_y;
1268     unsigned int num_pic_total_curr = 0;
1269     int err, i;
1270
1271     HEADER("Slice Segment Header");
1272
1273     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header, -1));
1274
1275     flag(first_slice_segment_in_pic_flag);
1276
1277     if (current->nal_unit_header.nal_unit_type >= HEVC_NAL_BLA_W_LP &&
1278         current->nal_unit_header.nal_unit_type <= HEVC_NAL_IRAP_VCL23)
1279         flag(no_output_of_prior_pics_flag);
1280
1281     ue(slice_pic_parameter_set_id, 0, 63);
1282
1283     pps = h265->pps[current->slice_pic_parameter_set_id];
1284     if (!pps) {
1285         av_log(ctx->log_ctx, AV_LOG_ERROR, "PPS id %d not available.\n",
1286                current->slice_pic_parameter_set_id);
1287         return AVERROR_INVALIDDATA;
1288     }
1289     h265->active_pps = pps;
1290
1291     sps = h265->sps[pps->pps_seq_parameter_set_id];
1292     if (!sps) {
1293         av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",
1294                pps->pps_seq_parameter_set_id);
1295         return AVERROR_INVALIDDATA;
1296     }
1297     h265->active_sps = sps;
1298
1299     min_cb_log2_size_y = sps->log2_min_luma_coding_block_size_minus3 + 3;
1300     ctb_log2_size_y = min_cb_log2_size_y + sps->log2_diff_max_min_luma_coding_block_size;
1301     ctb_size_y = 1 << ctb_log2_size_y;
1302     pic_width_in_ctbs_y =
1303         (sps->pic_width_in_luma_samples + ctb_size_y - 1) / ctb_size_y;
1304     pic_height_in_ctbs_y =
1305         (sps->pic_height_in_luma_samples + ctb_size_y - 1) / ctb_size_y;
1306     pic_size_in_ctbs_y = pic_width_in_ctbs_y * pic_height_in_ctbs_y;
1307
1308     if (!current->first_slice_segment_in_pic_flag) {
1309         unsigned int address_size = av_log2(pic_size_in_ctbs_y - 1) + 1;
1310         if (pps->dependent_slice_segments_enabled_flag)
1311             flag(dependent_slice_segment_flag);
1312         else
1313             infer(dependent_slice_segment_flag, 0);
1314         u(address_size, slice_segment_address, 0, pic_size_in_ctbs_y - 1);
1315     } else {
1316         infer(dependent_slice_segment_flag, 0);
1317     }
1318
1319     if (!current->dependent_slice_segment_flag) {
1320         for (i = 0; i < pps->num_extra_slice_header_bits; i++)
1321             flags(slice_reserved_flag[i], 1, i);
1322
1323         ue(slice_type, 0, 2);
1324
1325         if (pps->output_flag_present_flag)
1326             flag(pic_output_flag);
1327
1328         if (sps->separate_colour_plane_flag)
1329             u(2, colour_plane_id, 0, 2);
1330
1331         if (current->nal_unit_header.nal_unit_type != HEVC_NAL_IDR_W_RADL &&
1332             current->nal_unit_header.nal_unit_type != HEVC_NAL_IDR_N_LP) {
1333             const H265RawSTRefPicSet *rps;
1334
1335             ub(sps->log2_max_pic_order_cnt_lsb_minus4 + 4, slice_pic_order_cnt_lsb);
1336
1337             flag(short_term_ref_pic_set_sps_flag);
1338             if (!current->short_term_ref_pic_set_sps_flag) {
1339                 CHECK(FUNC(st_ref_pic_set)(ctx, rw, &current->short_term_ref_pic_set,
1340                                            sps->num_short_term_ref_pic_sets, sps));
1341                 rps = &current->short_term_ref_pic_set;
1342             } else if (sps->num_short_term_ref_pic_sets > 1) {
1343                 unsigned int idx_size = av_log2(sps->num_short_term_ref_pic_sets - 1) + 1;
1344                 u(idx_size, short_term_ref_pic_set_idx,
1345                   0, sps->num_short_term_ref_pic_sets - 1);
1346                 rps = &sps->st_ref_pic_set[current->short_term_ref_pic_set_idx];
1347             } else {
1348                 infer(short_term_ref_pic_set_idx, 0);
1349                 rps = &sps->st_ref_pic_set[0];
1350             }
1351
1352             num_pic_total_curr = 0;
1353             for (i = 0; i < rps->num_negative_pics; i++)
1354                 if (rps->used_by_curr_pic_s0_flag[i])
1355                     ++num_pic_total_curr;
1356             for (i = 0; i < rps->num_positive_pics; i++)
1357                 if (rps->used_by_curr_pic_s1_flag[i])
1358                     ++num_pic_total_curr;
1359
1360             if (sps->long_term_ref_pics_present_flag) {
1361                 unsigned int idx_size;
1362
1363                 if (sps->num_long_term_ref_pics_sps > 0) {
1364                     ue(num_long_term_sps, 0, sps->num_long_term_ref_pics_sps);
1365                     idx_size = av_log2(sps->num_long_term_ref_pics_sps - 1) + 1;
1366                 } else {
1367                     infer(num_long_term_sps, 0);
1368                     idx_size = 0;
1369                 }
1370                 ue(num_long_term_pics, 0, HEVC_MAX_LONG_TERM_REF_PICS);
1371
1372                 for (i = 0; i < current->num_long_term_sps +
1373                                 current->num_long_term_pics; i++) {
1374                     if (i < current->num_long_term_sps) {
1375                         if (sps->num_long_term_ref_pics_sps > 1)
1376                             us(idx_size, lt_idx_sps[i],
1377                                0, sps->num_long_term_ref_pics_sps - 1, 1, i);
1378                         if (sps->used_by_curr_pic_lt_sps_flag[current->lt_idx_sps[i]])
1379                             ++num_pic_total_curr;
1380                     } else {
1381                         ubs(sps->log2_max_pic_order_cnt_lsb_minus4 + 4, poc_lsb_lt[i], 1, i);
1382                         flags(used_by_curr_pic_lt_flag[i], 1, i);
1383                         if (current->used_by_curr_pic_lt_flag[i])
1384                             ++num_pic_total_curr;
1385                     }
1386                     flags(delta_poc_msb_present_flag[i], 1, i);
1387                     if (current->delta_poc_msb_present_flag[i])
1388                         ues(delta_poc_msb_cycle_lt[i], 0, UINT32_MAX - 1, 1, i);
1389                     else
1390                         infer(delta_poc_msb_cycle_lt[i], 0);
1391                 }
1392             }
1393
1394             if (sps->sps_temporal_mvp_enabled_flag)
1395                 flag(slice_temporal_mvp_enabled_flag);
1396             else
1397                 infer(slice_temporal_mvp_enabled_flag, 0);
1398
1399             if (pps->pps_curr_pic_ref_enabled_flag)
1400                 ++num_pic_total_curr;
1401         }
1402
1403         if (sps->sample_adaptive_offset_enabled_flag) {
1404             flag(slice_sao_luma_flag);
1405             if (!sps->separate_colour_plane_flag && sps->chroma_format_idc != 0)
1406                 flag(slice_sao_chroma_flag);
1407             else
1408                 infer(slice_sao_chroma_flag, 0);
1409         } else {
1410             infer(slice_sao_luma_flag,   0);
1411             infer(slice_sao_chroma_flag, 0);
1412         }
1413
1414         if (current->slice_type == HEVC_SLICE_P ||
1415             current->slice_type == HEVC_SLICE_B) {
1416             flag(num_ref_idx_active_override_flag);
1417             if (current->num_ref_idx_active_override_flag) {
1418                 ue(num_ref_idx_l0_active_minus1, 0, 14);
1419                 if (current->slice_type == HEVC_SLICE_B)
1420                     ue(num_ref_idx_l1_active_minus1, 0, 14);
1421                 else
1422                     infer(num_ref_idx_l1_active_minus1, pps->num_ref_idx_l1_default_active_minus1);
1423             } else {
1424                 infer(num_ref_idx_l0_active_minus1, pps->num_ref_idx_l0_default_active_minus1);
1425                 infer(num_ref_idx_l1_active_minus1, pps->num_ref_idx_l1_default_active_minus1);
1426             }
1427
1428             if (pps->lists_modification_present_flag && num_pic_total_curr > 1)
1429                 CHECK(FUNC(ref_pic_lists_modification)(ctx, rw, current,
1430                                                        num_pic_total_curr));
1431
1432             if (current->slice_type == HEVC_SLICE_B)
1433                 flag(mvd_l1_zero_flag);
1434             if (pps->cabac_init_present_flag)
1435                 flag(cabac_init_flag);
1436             else
1437                 infer(cabac_init_flag, 0);
1438             if (current->slice_temporal_mvp_enabled_flag) {
1439                 if (current->slice_type == HEVC_SLICE_B)
1440                     flag(collocated_from_l0_flag);
1441                 else
1442                     infer(collocated_from_l0_flag, 1);
1443                 if (current->collocated_from_l0_flag) {
1444                     if (current->num_ref_idx_l0_active_minus1 > 0)
1445                         ue(collocated_ref_idx, 0, current->num_ref_idx_l0_active_minus1);
1446                     else
1447                         infer(collocated_ref_idx, 0);
1448                 } else {
1449                     if (current->num_ref_idx_l1_active_minus1 > 0)
1450                         ue(collocated_ref_idx, 0, current->num_ref_idx_l1_active_minus1);
1451                     else
1452                         infer(collocated_ref_idx, 0);
1453                 }
1454             }
1455
1456             if ((pps->weighted_pred_flag   && current->slice_type == HEVC_SLICE_P) ||
1457                 (pps->weighted_bipred_flag && current->slice_type == HEVC_SLICE_B))
1458                 CHECK(FUNC(pred_weight_table)(ctx, rw, current));
1459
1460             ue(five_minus_max_num_merge_cand, 0, 4);
1461             if (sps->motion_vector_resolution_control_idc == 2)
1462                 flag(use_integer_mv_flag);
1463             else
1464                 infer(use_integer_mv_flag, sps->motion_vector_resolution_control_idc);
1465         }
1466
1467         se(slice_qp_delta,
1468            - 6 * sps->bit_depth_luma_minus8 - (pps->init_qp_minus26 + 26),
1469            + 51 - (pps->init_qp_minus26 + 26));
1470         if (pps->pps_slice_chroma_qp_offsets_present_flag) {
1471             se(slice_cb_qp_offset, -12, +12);
1472             se(slice_cr_qp_offset, -12, +12);
1473         } else {
1474             infer(slice_cb_qp_offset, 0);
1475             infer(slice_cr_qp_offset, 0);
1476         }
1477         if (pps->pps_slice_act_qp_offsets_present_flag) {
1478             se(slice_act_y_qp_offset,
1479                -12 - (pps->pps_act_y_qp_offset_plus5 - 5),
1480                +12 - (pps->pps_act_y_qp_offset_plus5 - 5));
1481             se(slice_act_cb_qp_offset,
1482                -12 - (pps->pps_act_cb_qp_offset_plus5 - 5),
1483                +12 - (pps->pps_act_cb_qp_offset_plus5 - 5));
1484             se(slice_act_cr_qp_offset,
1485                -12 - (pps->pps_act_cr_qp_offset_plus3 - 3),
1486                +12 - (pps->pps_act_cr_qp_offset_plus3 - 3));
1487         } else {
1488             infer(slice_act_y_qp_offset,  0);
1489             infer(slice_act_cb_qp_offset, 0);
1490             infer(slice_act_cr_qp_offset, 0);
1491         }
1492         if (pps->chroma_qp_offset_list_enabled_flag)
1493             flag(cu_chroma_qp_offset_enabled_flag);
1494         else
1495             infer(cu_chroma_qp_offset_enabled_flag, 0);
1496
1497         if (pps->deblocking_filter_override_enabled_flag)
1498             flag(deblocking_filter_override_flag);
1499         else
1500             infer(deblocking_filter_override_flag, 0);
1501         if (current->deblocking_filter_override_flag) {
1502             flag(slice_deblocking_filter_disabled_flag);
1503             if (!current->slice_deblocking_filter_disabled_flag) {
1504                 se(slice_beta_offset_div2, -6, +6);
1505                 se(slice_tc_offset_div2,   -6, +6);
1506             } else {
1507                 infer(slice_beta_offset_div2, pps->pps_beta_offset_div2);
1508                 infer(slice_tc_offset_div2,   pps->pps_tc_offset_div2);
1509             }
1510         } else {
1511             infer(slice_deblocking_filter_disabled_flag,
1512                   pps->pps_deblocking_filter_disabled_flag);
1513             infer(slice_beta_offset_div2, pps->pps_beta_offset_div2);
1514             infer(slice_tc_offset_div2,   pps->pps_tc_offset_div2);
1515         }
1516         if (pps->pps_loop_filter_across_slices_enabled_flag &&
1517             (current->slice_sao_luma_flag || current->slice_sao_chroma_flag ||
1518              !current->slice_deblocking_filter_disabled_flag))
1519             flag(slice_loop_filter_across_slices_enabled_flag);
1520         else
1521             infer(slice_loop_filter_across_slices_enabled_flag,
1522                   pps->pps_loop_filter_across_slices_enabled_flag);
1523     }
1524
1525     if (pps->tiles_enabled_flag || pps->entropy_coding_sync_enabled_flag) {
1526         unsigned int num_entry_point_offsets_limit;
1527         if (!pps->tiles_enabled_flag && pps->entropy_coding_sync_enabled_flag)
1528             num_entry_point_offsets_limit = pic_height_in_ctbs_y - 1;
1529         else if (pps->tiles_enabled_flag && !pps->entropy_coding_sync_enabled_flag)
1530             num_entry_point_offsets_limit =
1531                 (pps->num_tile_columns_minus1 + 1) * (pps->num_tile_rows_minus1 + 1);
1532         else
1533             num_entry_point_offsets_limit =
1534                 (pps->num_tile_columns_minus1 + 1) * pic_height_in_ctbs_y - 1;
1535         ue(num_entry_point_offsets, 0, num_entry_point_offsets_limit);
1536
1537         if (current->num_entry_point_offsets > HEVC_MAX_ENTRY_POINT_OFFSETS) {
1538             av_log(ctx->log_ctx, AV_LOG_ERROR, "Too many entry points: "
1539                    "%"PRIu16".\n", current->num_entry_point_offsets);
1540             return AVERROR_PATCHWELCOME;
1541         }
1542
1543         if (current->num_entry_point_offsets > 0) {
1544             ue(offset_len_minus1, 0, 31);
1545             for (i = 0; i < current->num_entry_point_offsets; i++)
1546                 ubs(current->offset_len_minus1 + 1, entry_point_offset_minus1[i], 1, i);
1547         }
1548     }
1549
1550     if (pps->slice_segment_header_extension_present_flag) {
1551         ue(slice_segment_header_extension_length, 0, 256);
1552         for (i = 0; i < current->slice_segment_header_extension_length; i++)
1553             us(8, slice_segment_header_extension_data_byte[i], 0x00, 0xff, 1, i);
1554     }
1555
1556     CHECK(FUNC(byte_alignment)(ctx, rw));
1557
1558     return 0;
1559 }
1560
1561 static int FUNC(sei_buffering_period)(CodedBitstreamContext *ctx, RWContext *rw,
1562                                       H265RawSEIBufferingPeriod *current,
1563                                       uint32_t *payload_size)
1564 {
1565     CodedBitstreamH265Context *h265 = ctx->priv_data;
1566     const H265RawSPS *sps;
1567     const H265RawHRDParameters *hrd;
1568     int err, i, length;
1569
1570 #ifdef READ
1571     int start_pos, end_pos, bits_left;
1572     start_pos = get_bits_count(rw);
1573 #endif
1574
1575     HEADER("Buffering Period");
1576
1577     ue(bp_seq_parameter_set_id, 0, HEVC_MAX_SPS_COUNT - 1);
1578
1579     sps = h265->sps[current->bp_seq_parameter_set_id];
1580     if (!sps) {
1581         av_log(ctx->log_ctx, AV_LOG_ERROR, "SPS id %d not available.\n",
1582                current->bp_seq_parameter_set_id);
1583         return AVERROR_INVALIDDATA;
1584     }
1585     h265->active_sps = sps;
1586
1587     if (!sps->vui_parameters_present_flag ||
1588         !sps->vui.vui_hrd_parameters_present_flag) {
1589         av_log(ctx->log_ctx, AV_LOG_ERROR, "Buffering period SEI requires "
1590                "HRD parameters to be present in SPS.\n");
1591         return AVERROR_INVALIDDATA;
1592     }
1593     hrd = &sps->vui.hrd_parameters;
1594     if (!hrd->nal_hrd_parameters_present_flag &&
1595         !hrd->vcl_hrd_parameters_present_flag) {
1596         av_log(ctx->log_ctx, AV_LOG_ERROR, "Buffering period SEI requires "
1597                "NAL or VCL HRD parameters to be present.\n");
1598         return AVERROR_INVALIDDATA;
1599     }
1600
1601     if (!hrd->sub_pic_hrd_params_present_flag)
1602         flag(irap_cpb_params_present_flag);
1603     else
1604         infer(irap_cpb_params_present_flag, 0);
1605     if (current->irap_cpb_params_present_flag) {
1606         length = hrd->au_cpb_removal_delay_length_minus1 + 1;
1607         ub(length, cpb_delay_offset);
1608         length = hrd->dpb_output_delay_length_minus1 + 1;
1609         ub(length, dpb_delay_offset);
1610     } else {
1611         infer(cpb_delay_offset, 0);
1612         infer(dpb_delay_offset, 0);
1613     }
1614
1615     flag(concatenation_flag);
1616
1617     length = hrd->au_cpb_removal_delay_length_minus1 + 1;
1618     ub(length, au_cpb_removal_delay_delta_minus1);
1619
1620     if (hrd->nal_hrd_parameters_present_flag) {
1621         for (i = 0; i <= hrd->cpb_cnt_minus1[0]; i++) {
1622             length = hrd->initial_cpb_removal_delay_length_minus1 + 1;
1623
1624             ubs(length, nal_initial_cpb_removal_delay[i], 1, i);
1625             ubs(length, nal_initial_cpb_removal_offset[i], 1, i);
1626
1627             if (hrd->sub_pic_hrd_params_present_flag ||
1628                 current->irap_cpb_params_present_flag) {
1629                 ubs(length, nal_initial_alt_cpb_removal_delay[i], 1, i);
1630                 ubs(length, nal_initial_alt_cpb_removal_offset[i], 1, i);
1631             }
1632         }
1633     }
1634     if (hrd->vcl_hrd_parameters_present_flag) {
1635         for (i = 0; i <= hrd->cpb_cnt_minus1[0]; i++) {
1636             length = hrd->initial_cpb_removal_delay_length_minus1 + 1;
1637
1638             ubs(length, vcl_initial_cpb_removal_delay[i], 1, i);
1639             ubs(length, vcl_initial_cpb_removal_offset[i], 1, i);
1640
1641             if (hrd->sub_pic_hrd_params_present_flag ||
1642                 current->irap_cpb_params_present_flag) {
1643                 ubs(length, vcl_initial_alt_cpb_removal_delay[i], 1, i);
1644                 ubs(length, vcl_initial_alt_cpb_removal_offset[i], 1, i);
1645             }
1646         }
1647     }
1648
1649 #ifdef READ
1650     // payload_extension_present() - true if we are before the last 1-bit
1651     // in the payload structure, which must be in the last byte.
1652     end_pos = get_bits_count(rw);
1653     bits_left = *payload_size * 8 - (end_pos - start_pos);
1654     if (bits_left > 0 &&
1655         (bits_left > 7 || ff_ctz(show_bits(rw, bits_left)) < bits_left - 1))
1656         flag(use_alt_cpb_params_flag);
1657     else
1658         infer(use_alt_cpb_params_flag, 0);
1659 #else
1660     if (current->use_alt_cpb_params_flag)
1661         flag(use_alt_cpb_params_flag);
1662 #endif
1663
1664     return 0;
1665 }
1666
1667 static int FUNC(sei_pic_timing)(CodedBitstreamContext *ctx, RWContext *rw,
1668                                 H265RawSEIPicTiming *current)
1669 {
1670     CodedBitstreamH265Context *h265 = ctx->priv_data;
1671     const H265RawSPS *sps;
1672     const H265RawHRDParameters *hrd;
1673     int err, expected_source_scan_type, i, length;
1674
1675     HEADER("Picture Timing");
1676
1677     sps = h265->active_sps;
1678     if (!sps) {
1679         av_log(ctx->log_ctx, AV_LOG_ERROR,
1680                "No active SPS for pic_timing.\n");
1681         return AVERROR_INVALIDDATA;
1682     }
1683
1684     expected_source_scan_type = 2 -
1685         2 * sps->profile_tier_level.general_interlaced_source_flag -
1686         sps->profile_tier_level.general_progressive_source_flag;
1687
1688     if (sps->vui.frame_field_info_present_flag) {
1689         u(4, pic_struct, 0, 12);
1690         u(2, source_scan_type,
1691           expected_source_scan_type >= 0 ? expected_source_scan_type : 0,
1692           expected_source_scan_type >= 0 ? expected_source_scan_type : 2);
1693         flag(duplicate_flag);
1694     } else {
1695         infer(pic_struct, 0);
1696         infer(source_scan_type,
1697               expected_source_scan_type >= 0 ? expected_source_scan_type : 2);
1698         infer(duplicate_flag, 0);
1699     }
1700
1701     if (sps->vui_parameters_present_flag &&
1702         sps->vui.vui_hrd_parameters_present_flag)
1703         hrd = &sps->vui.hrd_parameters;
1704     else
1705         hrd = NULL;
1706     if (hrd && (hrd->nal_hrd_parameters_present_flag ||
1707                 hrd->vcl_hrd_parameters_present_flag)) {
1708         length = hrd->au_cpb_removal_delay_length_minus1 + 1;
1709         ub(length, au_cpb_removal_delay_minus1);
1710
1711         length = hrd->dpb_output_delay_length_minus1 + 1;
1712         ub(length, pic_dpb_output_delay);
1713
1714         if (hrd->sub_pic_hrd_params_present_flag) {
1715             length = hrd->dpb_output_delay_du_length_minus1 + 1;
1716             ub(length, pic_dpb_output_du_delay);
1717         }
1718
1719         if (hrd->sub_pic_hrd_params_present_flag &&
1720             hrd->sub_pic_cpb_params_in_pic_timing_sei_flag) {
1721             // Each decoding unit must contain at least one slice segment.
1722             ue(num_decoding_units_minus1, 0, HEVC_MAX_SLICE_SEGMENTS);
1723             flag(du_common_cpb_removal_delay_flag);
1724
1725             length = hrd->du_cpb_removal_delay_increment_length_minus1 + 1;
1726             if (current->du_common_cpb_removal_delay_flag)
1727                 ub(length, du_common_cpb_removal_delay_increment_minus1);
1728
1729             for (i = 0; i <= current->num_decoding_units_minus1; i++) {
1730                 ues(num_nalus_in_du_minus1[i],
1731                     0, HEVC_MAX_SLICE_SEGMENTS, 1, i);
1732                 if (!current->du_common_cpb_removal_delay_flag &&
1733                     i < current->num_decoding_units_minus1)
1734                     ubs(length, du_cpb_removal_delay_increment_minus1[i], 1, i);
1735             }
1736         }
1737     }
1738
1739     return 0;
1740 }
1741
1742 static int FUNC(sei_pan_scan_rect)(CodedBitstreamContext *ctx, RWContext *rw,
1743                                    H265RawSEIPanScanRect *current)
1744 {
1745     int err, i;
1746
1747     HEADER("Pan-Scan Rectangle");
1748
1749     ue(pan_scan_rect_id, 0, UINT32_MAX - 1);
1750     flag(pan_scan_rect_cancel_flag);
1751
1752     if (!current->pan_scan_rect_cancel_flag) {
1753         ue(pan_scan_cnt_minus1, 0, 2);
1754
1755         for (i = 0; i <= current->pan_scan_cnt_minus1; i++) {
1756             ses(pan_scan_rect_left_offset[i],   INT32_MIN + 1, INT32_MAX, 1, i);
1757             ses(pan_scan_rect_right_offset[i],  INT32_MIN + 1, INT32_MAX, 1, i);
1758             ses(pan_scan_rect_top_offset[i],    INT32_MIN + 1, INT32_MAX, 1, i);
1759             ses(pan_scan_rect_bottom_offset[i], INT32_MIN + 1, INT32_MAX, 1, i);
1760         }
1761
1762         flag(pan_scan_rect_persistence_flag);
1763     }
1764
1765     return 0;
1766 }
1767
1768 static int FUNC(sei_user_data_registered)(CodedBitstreamContext *ctx, RWContext *rw,
1769                                           H265RawSEIUserDataRegistered *current,
1770                                           uint32_t *payload_size)
1771 {
1772     int err, i, j;
1773
1774     HEADER("User Data Registered ITU-T T.35");
1775
1776     u(8, itu_t_t35_country_code, 0x00, 0xff);
1777     if (current->itu_t_t35_country_code != 0xff)
1778         i = 1;
1779     else {
1780         u(8, itu_t_t35_country_code_extension_byte, 0x00, 0xff);
1781         i = 2;
1782     }
1783
1784 #ifdef READ
1785     if (*payload_size < i) {
1786         av_log(ctx->log_ctx, AV_LOG_ERROR,
1787                "Invalid SEI user data registered payload.\n");
1788         return AVERROR_INVALIDDATA;
1789     }
1790     current->data_length = *payload_size - i;
1791 #else
1792     *payload_size = i + current->data_length;
1793 #endif
1794
1795     allocate(current->data, current->data_length);
1796     for (j = 0; j < current->data_length; j++)
1797         xu(8, itu_t_t35_payload_byte[i], current->data[j], 0x00, 0xff, 1, i + j);
1798
1799     return 0;
1800 }
1801
1802 static int FUNC(sei_user_data_unregistered)(CodedBitstreamContext *ctx, RWContext *rw,
1803                                             H265RawSEIUserDataUnregistered *current,
1804                                             uint32_t *payload_size)
1805 {
1806     int err, i;
1807
1808     HEADER("User Data Unregistered");
1809
1810 #ifdef READ
1811     if (*payload_size < 16) {
1812         av_log(ctx->log_ctx, AV_LOG_ERROR,
1813                "Invalid SEI user data unregistered payload.\n");
1814         return AVERROR_INVALIDDATA;
1815     }
1816     current->data_length = *payload_size - 16;
1817 #else
1818     *payload_size = 16 + current->data_length;
1819 #endif
1820
1821     for (i = 0; i < 16; i++)
1822         us(8, uuid_iso_iec_11578[i], 0x00, 0xff, 1, i);
1823
1824     allocate(current->data, current->data_length);
1825
1826     for (i = 0; i < current->data_length; i++)
1827         xu(8, user_data_payload_byte[i], current->data[i], 0x00, 0xff, 1, i);
1828
1829     return 0;
1830 }
1831
1832 static int FUNC(sei_recovery_point)(CodedBitstreamContext *ctx, RWContext *rw,
1833                                     H265RawSEIRecoveryPoint *current)
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)(CodedBitstreamContext *ctx, RWContext *rw,
1848                                          H265RawSEIDisplayOrientation *current)
1849 {
1850     int err;
1851
1852     HEADER("Display Orientation");
1853
1854     flag(display_orientation_cancel_flag);
1855     if (!current->display_orientation_cancel_flag) {
1856         flag(hor_flip);
1857         flag(ver_flip);
1858         ub(16, anticlockwise_rotation);
1859         flag(display_orientation_persistence_flag);
1860     }
1861
1862     return 0;
1863 }
1864
1865 static int FUNC(sei_active_parameter_sets)(CodedBitstreamContext *ctx, RWContext *rw,
1866                                            H265RawSEIActiveParameterSets *current)
1867 {
1868     CodedBitstreamH265Context *h265 = ctx->priv_data;
1869     const H265RawVPS *vps;
1870     int err, i;
1871
1872     HEADER("Active Parameter Sets");
1873
1874     u(4, active_video_parameter_set_id, 0, HEVC_MAX_VPS_COUNT);
1875     vps = h265->vps[current->active_video_parameter_set_id];
1876     if (!vps) {
1877         av_log(ctx->log_ctx, AV_LOG_ERROR, "VPS id %d not available for active "
1878                "parameter sets.\n", current->active_video_parameter_set_id);
1879         return AVERROR_INVALIDDATA;
1880     }
1881     h265->active_vps = vps;
1882
1883     flag(self_contained_cvs_flag);
1884     flag(no_parameter_set_update_flag);
1885
1886     ue(num_sps_ids_minus1, 0, HEVC_MAX_SPS_COUNT - 1);
1887     for (i = 0; i <= current->num_sps_ids_minus1; i++)
1888         ues(active_seq_parameter_set_id[i], 0, HEVC_MAX_SPS_COUNT - 1, 1, i);
1889
1890     for (i = vps->vps_base_layer_internal_flag;
1891          i <= FFMIN(62, vps->vps_max_layers_minus1); i++) {
1892         ues(layer_sps_idx[i], 0, current->num_sps_ids_minus1, 1, i);
1893
1894         if (i == 0)
1895             h265->active_sps = h265->sps[current->active_seq_parameter_set_id[current->layer_sps_idx[0]]];
1896     }
1897
1898     return 0;
1899 }
1900
1901 static int FUNC(sei_decoded_picture_hash)(CodedBitstreamContext *ctx, RWContext *rw,
1902                                           H265RawSEIDecodedPictureHash *current)
1903 {
1904     CodedBitstreamH265Context *h265 = ctx->priv_data;
1905     const H265RawSPS *sps = h265->active_sps;
1906     int err, c, i;
1907
1908     HEADER("Decoded Picture Hash");
1909
1910     if (!sps) {
1911         av_log(ctx->log_ctx, AV_LOG_ERROR,
1912                "No active SPS for decoded picture hash.\n");
1913         return AVERROR_INVALIDDATA;
1914     }
1915
1916     u(8, hash_type, 0, 2);
1917
1918     for (c = 0; c < (sps->chroma_format_idc == 0 ? 1 : 3); c++) {
1919         if (current->hash_type == 0) {
1920             for (i = 0; i < 16; i++)
1921                 us(8, picture_md5[c][i], 0x00, 0xff, 2, c, i);
1922         } else if (current->hash_type == 1) {
1923             us(16, picture_crc[c], 0x0000, 0xffff, 1, c);
1924         } else if (current->hash_type == 2) {
1925             us(32, picture_checksum[c], 0x00000000, 0xffffffff, 1, c);
1926         }
1927     }
1928
1929     return 0;
1930 }
1931
1932 static int FUNC(sei_time_code)(CodedBitstreamContext *ctx, RWContext *rw,
1933                                H265RawSEITimeCode *current)
1934 {
1935     int err, i;
1936
1937     HEADER("Time Code");
1938
1939     u(2, num_clock_ts, 1, 3);
1940
1941     for (i = 0; i < current->num_clock_ts; i++) {
1942         flags(clock_timestamp_flag[i],   1, i);
1943
1944         if (current->clock_timestamp_flag[i]) {
1945             flags(units_field_based_flag[i], 1, i);
1946             us(5, counting_type[i], 0, 6,    1, i);
1947             flags(full_timestamp_flag[i],    1, i);
1948             flags(discontinuity_flag[i],     1, i);
1949             flags(cnt_dropped_flag[i],       1, i);
1950
1951             ubs(9, n_frames[i], 1, i);
1952
1953             if (current->full_timestamp_flag[i]) {
1954                 us(6, seconds_value[i], 0, 59, 1, i);
1955                 us(6, minutes_value[i], 0, 59, 1, i);
1956                 us(5, hours_value[i],   0, 23, 1, i);
1957             } else {
1958                 flags(seconds_flag[i], 1, i);
1959                 if (current->seconds_flag[i]) {
1960                     us(6, seconds_value[i], 0, 59, 1, i);
1961                     flags(minutes_flag[i], 1, i);
1962                     if (current->minutes_flag[i]) {
1963                         us(6, minutes_value[i], 0, 59, 1, i);
1964                         flags(hours_flag[i], 1, i);
1965                         if (current->hours_flag[i])
1966                             us(5, hours_value[i], 0, 23, 1, i);
1967                     }
1968                 }
1969             }
1970
1971             ubs(5, time_offset_length[i], 1, i);
1972             if (current->time_offset_length[i] > 0)
1973                 ibs(current->time_offset_length[i], time_offset_value[i], 1, i);
1974             else
1975                 infer(time_offset_value[i], 0);
1976         }
1977     }
1978
1979     return 0;
1980 }
1981
1982 static int FUNC(sei_mastering_display)(CodedBitstreamContext *ctx, RWContext *rw,
1983                                        H265RawSEIMasteringDisplayColourVolume *current)
1984 {
1985     int err, c;
1986
1987     HEADER("Mastering Display Colour Volume");
1988
1989     for (c = 0; c < 3; c++) {
1990         us(16, display_primaries_x[c], 0, 50000, 1, c);
1991         us(16, display_primaries_y[c], 0, 50000, 1, c);
1992     }
1993
1994     u(16, white_point_x, 0, 50000);
1995     u(16, white_point_y, 0, 50000);
1996
1997     u(32, max_display_mastering_luminance,
1998       1, MAX_UINT_BITS(32));
1999     u(32, min_display_mastering_luminance,
2000       0, current->max_display_mastering_luminance - 1);
2001
2002     return 0;
2003 }
2004
2005 static int FUNC(sei_content_light_level)(CodedBitstreamContext *ctx, RWContext *rw,
2006                                          H265RawSEIContentLightLevelInfo *current)
2007 {
2008     int err;
2009
2010     HEADER("Content Light Level");
2011
2012     ub(16, max_content_light_level);
2013     ub(16, max_pic_average_light_level);
2014
2015     return 0;
2016 }
2017
2018 static int FUNC(sei_alternative_transfer_characteristics)(CodedBitstreamContext *ctx,
2019                                                           RWContext *rw,
2020                                                           H265RawSEIAlternativeTransferCharacteristics *current)
2021 {
2022     int err;
2023
2024     HEADER("Alternative Transfer Characteristics");
2025
2026     ub(8, preferred_transfer_characteristics);
2027
2028     return 0;
2029 }
2030
2031 static int FUNC(sei_payload)(CodedBitstreamContext *ctx, RWContext *rw,
2032                              H265RawSEIPayload *current, int prefix)
2033 {
2034     int err, i;
2035     int start_position, end_position;
2036
2037 #ifdef READ
2038     start_position = get_bits_count(rw);
2039 #else
2040     start_position = put_bits_count(rw);
2041 #endif
2042
2043     switch (current->payload_type) {
2044 #define SEI_TYPE_CHECK_VALID(name, prefix_valid, suffix_valid) do { \
2045             if (prefix && !prefix_valid) { \
2046                 av_log(ctx->log_ctx, AV_LOG_ERROR, "SEI type %s invalid " \
2047                        "as prefix SEI!\n", #name); \
2048                 return AVERROR_INVALIDDATA; \
2049             } \
2050             if (!prefix && !suffix_valid) { \
2051                 av_log(ctx->log_ctx, AV_LOG_ERROR, "SEI type %s invalid " \
2052                        "as suffix SEI!\n", #name); \
2053                 return AVERROR_INVALIDDATA; \
2054             } \
2055         } while (0)
2056 #define SEI_TYPE_N(type, prefix_valid, suffix_valid, name) \
2057     case HEVC_SEI_TYPE_ ## type: \
2058         SEI_TYPE_CHECK_VALID(name, prefix_valid, suffix_valid); \
2059         CHECK(FUNC(sei_ ## name)(ctx, rw, &current->payload.name)); \
2060         break
2061 #define SEI_TYPE_S(type, prefix_valid, suffix_valid, name) \
2062     case HEVC_SEI_TYPE_ ## type: \
2063         SEI_TYPE_CHECK_VALID(name, prefix_valid, suffix_valid); \
2064         CHECK(FUNC(sei_ ## name)(ctx, rw, &current->payload.name, \
2065                                  &current->payload_size)); \
2066         break
2067
2068         SEI_TYPE_S(BUFFERING_PERIOD,         1, 0, buffering_period);
2069         SEI_TYPE_N(PICTURE_TIMING,           1, 0, pic_timing);
2070         SEI_TYPE_N(PAN_SCAN_RECT,            1, 0, pan_scan_rect);
2071         SEI_TYPE_S(USER_DATA_REGISTERED_ITU_T_T35,
2072                                              1, 1, user_data_registered);
2073         SEI_TYPE_S(USER_DATA_UNREGISTERED,   1, 1, user_data_unregistered);
2074         SEI_TYPE_N(RECOVERY_POINT,           1, 0, recovery_point);
2075         SEI_TYPE_N(DISPLAY_ORIENTATION,      1, 0, display_orientation);
2076         SEI_TYPE_N(ACTIVE_PARAMETER_SETS,    1, 0, active_parameter_sets);
2077         SEI_TYPE_N(DECODED_PICTURE_HASH,     0, 1, decoded_picture_hash);
2078         SEI_TYPE_N(TIME_CODE,                1, 0, time_code);
2079         SEI_TYPE_N(MASTERING_DISPLAY_INFO,   1, 0, mastering_display);
2080         SEI_TYPE_N(CONTENT_LIGHT_LEVEL_INFO, 1, 0, content_light_level);
2081         SEI_TYPE_N(ALTERNATIVE_TRANSFER_CHARACTERISTICS,
2082                                              1, 0, alternative_transfer_characteristics);
2083
2084 #undef SEI_TYPE
2085     default:
2086         {
2087 #ifdef READ
2088             current->payload.other.data_length = current->payload_size;
2089 #endif
2090             allocate(current->payload.other.data, current->payload.other.data_length);
2091
2092             for (i = 0; i < current->payload_size; i++)
2093                 xu(8, payload_byte[i], current->payload.other.data[i], 0, 255,
2094                    1, i);
2095         }
2096     }
2097
2098     if (byte_alignment(rw)) {
2099         fixed(1, bit_equal_to_one, 1);
2100         while (byte_alignment(rw))
2101             fixed(1, bit_equal_to_zero, 0);
2102     }
2103
2104 #ifdef READ
2105     end_position = get_bits_count(rw);
2106     if (end_position < start_position + 8 * current->payload_size) {
2107         av_log(ctx->log_ctx, AV_LOG_ERROR, "Incorrect SEI payload length: "
2108                "header %"PRIu32" bits, actually %d bits.\n",
2109                8 * current->payload_size,
2110                end_position - start_position);
2111         return AVERROR_INVALIDDATA;
2112     }
2113 #else
2114     end_position = put_bits_count(rw);
2115     current->payload_size = (end_position - start_position) >> 3;
2116 #endif
2117
2118     return 0;
2119 }
2120
2121 static int FUNC(sei)(CodedBitstreamContext *ctx, RWContext *rw,
2122                      H265RawSEI *current, int prefix)
2123 {
2124     int err, k;
2125
2126     if (prefix)
2127         HEADER("Prefix Supplemental Enhancement Information");
2128     else
2129         HEADER("Suffix Supplemental Enhancement Information");
2130
2131     CHECK(FUNC(nal_unit_header)(ctx, rw, &current->nal_unit_header,
2132                                 prefix ? HEVC_NAL_SEI_PREFIX
2133                                        : HEVC_NAL_SEI_SUFFIX));
2134
2135 #ifdef READ
2136     for (k = 0; k < H265_MAX_SEI_PAYLOADS; k++) {
2137         uint32_t payload_type = 0;
2138         uint32_t payload_size = 0;
2139         uint32_t tmp;
2140
2141         while (show_bits(rw, 8) == 0xff) {
2142             fixed(8, ff_byte, 0xff);
2143             payload_type += 255;
2144         }
2145         xu(8, last_payload_type_byte, tmp, 0, 254, 0);
2146         payload_type += tmp;
2147
2148         while (show_bits(rw, 8) == 0xff) {
2149             fixed(8, ff_byte, 0xff);
2150             payload_size += 255;
2151         }
2152         xu(8, last_payload_size_byte, tmp, 0, 254, 0);
2153         payload_size += tmp;
2154
2155         current->payload[k].payload_type = payload_type;
2156         current->payload[k].payload_size = payload_size;
2157
2158         CHECK(FUNC(sei_payload)(ctx, rw, &current->payload[k], prefix));
2159
2160         if (!cbs_h2645_read_more_rbsp_data(rw))
2161             break;
2162     }
2163     if (k >= H265_MAX_SEI_PAYLOADS) {
2164         av_log(ctx->log_ctx, AV_LOG_ERROR, "Too many payloads in "
2165                "SEI message: found %d.\n", k);
2166         return AVERROR_INVALIDDATA;
2167     }
2168     current->payload_count = k + 1;
2169 #else
2170     for (k = 0; k < current->payload_count; k++) {
2171         PutBitContext start_state;
2172         uint32_t tmp;
2173         int need_size, i;
2174
2175         // Somewhat clumsy: we write the payload twice when
2176         // we don't know the size in advance.  This will mess
2177         // with trace output, but is otherwise harmless.
2178         start_state = *rw;
2179         need_size = !current->payload[k].payload_size;
2180         for (i = 0; i < 1 + need_size; i++) {
2181             *rw = start_state;
2182
2183             tmp = current->payload[k].payload_type;
2184             while (tmp >= 255) {
2185                 fixed(8, ff_byte, 0xff);
2186                 tmp -= 255;
2187             }
2188             xu(8, last_payload_type_byte, tmp, 0, 254, 0);
2189
2190             tmp = current->payload[k].payload_size;
2191             while (tmp >= 255) {
2192                 fixed(8, ff_byte, 0xff);
2193                 tmp -= 255;
2194             }
2195             xu(8, last_payload_size_byte, tmp, 0, 254, 0);
2196
2197             CHECK(FUNC(sei_payload)(ctx, rw, &current->payload[k], prefix));
2198         }
2199     }
2200 #endif
2201
2202     CHECK(FUNC(rbsp_trailing_bits)(ctx, rw));
2203
2204     return 0;
2205 }