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   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(obu_header)(CodedBitstreamContext *ctx, RWContext *rw,
  20                             AV1RawOBUHeader *current)
  21 {
  22     int err;
  23     av_unused int zero = 0;
  24
  25     HEADER("OBU header");
  26
  27     fc(1, obu_forbidden_bit, 0, 0);
  28
  29     fc(4, obu_type, 0, AV1_OBU_PADDING);
  30     flag(obu_extension_flag);
  31     flag(obu_has_size_field);
  32
  33     fc(1, obu_reserved_1bit, 0, 0);
  34
  35     if (current->obu_extension_flag) {
  36         fb(3, temporal_id);
  37         fb(2, spatial_id);
  38         fc(3, extension_header_reserved_3bits, 0, 0);
  39     }
  40
  41     return 0;
  42 }
  43
  44 static int FUNC(trailing_bits)(CodedBitstreamContext *ctx, RWContext *rw, int nb_bits)
  45 {
  46     int err;
  47
  48     av_assert0(nb_bits > 0);
  49
  50     fixed(1, trailing_one_bit, 1);
  51     --nb_bits;
  52
  53     while (nb_bits > 0) {
  54         fixed(1, trailing_zero_bit, 0);
  55         --nb_bits;
  56     }
  57
  58     return 0;
  59 }
  60
  61 static int FUNC(byte_alignment)(CodedBitstreamContext *ctx, RWContext *rw)
  62 {
  63     int err;
  64
  65     while (byte_alignment(rw) != 0)
  66         fixed(1, zero_bit, 0);
  67
  68     return 0;
  69 }
  70
  71 static int FUNC(color_config)(CodedBitstreamContext *ctx, RWContext *rw,
  72                               AV1RawColorConfig *current, int seq_profile)
  73 {
  74     CodedBitstreamAV1Context *priv = ctx->priv_data;
  75     int err;
  76
  77     flag(high_bitdepth);
  78
  79     if (seq_profile == FF_PROFILE_AV1_PROFESSIONAL &&
  80         current->high_bitdepth) {
  81         flag(twelve_bit);
  82         priv->bit_depth = current->twelve_bit ? 12 : 10;
  83     } else {
  84         priv->bit_depth = current->high_bitdepth ? 10 : 8;
  85     }
  86
  87     if (seq_profile == FF_PROFILE_AV1_HIGH)
  88         infer(mono_chrome, 0);
  89     else
  90         flag(mono_chrome);
  91     priv->num_planes = current->mono_chrome ? 1 : 3;
  92
  93     flag(color_description_present_flag);
  94     if (current->color_description_present_flag) {
  95         fb(8, color_primaries);
  96         fb(8, transfer_characteristics);
  97         fb(8, matrix_coefficients);
  98     } else {
  99         infer(color_primaries,          AVCOL_PRI_UNSPECIFIED);
 100         infer(transfer_characteristics, AVCOL_TRC_UNSPECIFIED);
 101         infer(matrix_coefficients,      AVCOL_SPC_UNSPECIFIED);
 102     }
 103
 104     if (current->mono_chrome) {
 105         flag(color_range);
 106
 107         infer(subsampling_x, 1);
 108         infer(subsampling_y, 1);
 109         infer(chroma_sample_position, AV1_CSP_UNKNOWN);
 110         infer(separate_uv_delta_q, 0);
 111
 112     } else if (current->color_primaries          == AVCOL_PRI_BT709 &&
 113                current->transfer_characteristics == AVCOL_TRC_IEC61966_2_1 &&
 114                current->matrix_coefficients      == AVCOL_SPC_RGB) {
 115         infer(color_range,   1);
 116         infer(subsampling_x, 0);
 117         infer(subsampling_y, 0);
 118         flag(separate_uv_delta_q);
 119
 120     } else {
 121         flag(color_range);
 122
 123         if (seq_profile == FF_PROFILE_AV1_MAIN) {
 124             infer(subsampling_x, 1);
 125             infer(subsampling_y, 1);
 126         } else if (seq_profile == FF_PROFILE_AV1_HIGH) {
 127             infer(subsampling_x, 0);
 128             infer(subsampling_y, 0);
 129         } else {
 130             if (priv->bit_depth == 12) {
 131                 fb(1, subsampling_x);
 132                 if (current->subsampling_x)
 133                     fb(1, subsampling_y);
 134                 else
 135                     infer(subsampling_y, 0);
 136             } else {
 137                 infer(subsampling_x, 1);
 138                 infer(subsampling_y, 0);
 139             }
 140         }
 141         if (current->subsampling_x && current->subsampling_y) {
 142             fc(2, chroma_sample_position, AV1_CSP_UNKNOWN,
 143                                           AV1_CSP_COLOCATED);
 144         }
 145
 146         flag(separate_uv_delta_q);
 147     }
 148
 149     return 0;
 150 }
 151
 152 static int FUNC(timing_info)(CodedBitstreamContext *ctx, RWContext *rw,
 153                              AV1RawTimingInfo *current)
 154 {
 155     int err;
 156
 157     fc(32, num_units_in_display_tick, 1, MAX_UINT_BITS(32));
 158     fc(32, time_scale,                1, MAX_UINT_BITS(32));
 159
 160     flag(equal_picture_interval);
 161     if (current->equal_picture_interval)
 162         uvlc(num_ticks_per_picture_minus_1, 0, MAX_UINT_BITS(32) - 1);
 163
 164     return 0;
 165 }
 166
 167 static int FUNC(decoder_model_info)(CodedBitstreamContext *ctx, RWContext *rw,
 168                                     AV1RawDecoderModelInfo *current)
 169 {
 170     int err;
 171
 172     fb(5, buffer_delay_length_minus_1);
 173     fb(32, num_units_in_decoding_tick);
 174     fb(5,  buffer_removal_time_length_minus_1);
 175     fb(5,  frame_presentation_time_length_minus_1);
 176
 177     return 0;
 178 }
 179
 180 static int FUNC(sequence_header_obu)(CodedBitstreamContext *ctx, RWContext *rw,
 181                                      AV1RawSequenceHeader *current)
 182 {
 183     int i, err;
 184
 185     HEADER("Sequence Header");
 186
 187     fc(3, seq_profile, FF_PROFILE_AV1_MAIN,
 188                        FF_PROFILE_AV1_PROFESSIONAL);
 189     flag(still_picture);
 190     flag(reduced_still_picture_header);
 191
 192     if (current->reduced_still_picture_header) {
 193         infer(timing_info_present_flag,           0);
 194         infer(decoder_model_info_present_flag,    0);
 195         infer(initial_display_delay_present_flag, 0);
 196         infer(operating_points_cnt_minus_1,       0);
 197         infer(operating_point_idc[0],             0);
 198
 199         fb(5, seq_level_idx[0]);
 200
 201         infer(seq_tier[0], 0);
 202         infer(decoder_model_present_for_this_op[0],         0);
 203         infer(initial_display_delay_present_for_this_op[0], 0);
 204
 205     } else {
 206         flag(timing_info_present_flag);
 207         if (current->timing_info_present_flag) {
 208             CHECK(FUNC(timing_info)(ctx, rw, &current->timing_info));
 209
 210             flag(decoder_model_info_present_flag);
 211             if (current->decoder_model_info_present_flag) {
 212                 CHECK(FUNC(decoder_model_info)
 213                           (ctx, rw, &current->decoder_model_info));
 214             }
 215         } else {
 216             infer(decoder_model_info_present_flag, 0);
 217         }
 218
 219         flag(initial_display_delay_present_flag);
 220
 221         fb(5, operating_points_cnt_minus_1);
 222         for (i = 0; i <= current->operating_points_cnt_minus_1; i++) {
 223             fbs(12, operating_point_idc[i], 1, i);
 224             fbs(5,  seq_level_idx[i], 1, i);
 225
 226             if (current->seq_level_idx[i] > 7)
 227                 flags(seq_tier[i], 1, i);
 228             else
 229                 infer(seq_tier[i], 0);
 230
 231             if (current->decoder_model_info_present_flag) {
 232                 flags(decoder_model_present_for_this_op[i], 1, i);
 233                 if (current->decoder_model_present_for_this_op[i]) {
 234                     int n = current->decoder_model_info.buffer_delay_length_minus_1 + 1;
 235                     fbs(n, decoder_buffer_delay[i], 1, i);
 236                     fbs(n, encoder_buffer_delay[i], 1, i);
 237                     flags(low_delay_mode_flag[i], 1, i);
 238                 }
 239             } else {
 240                 infer(decoder_model_present_for_this_op[i], 0);
 241             }
 242
 243             if (current->initial_display_delay_present_flag) {
 244                 flags(initial_display_delay_present_for_this_op[i], 1, i);
 245                 if (current->initial_display_delay_present_for_this_op[i])
 246                     fbs(4, initial_display_delay_minus_1[i], 1, i);
 247             }
 248         }
 249     }
 250
 251     fb(4, frame_width_bits_minus_1);
 252     fb(4, frame_height_bits_minus_1);
 253
 254     fb(current->frame_width_bits_minus_1  + 1, max_frame_width_minus_1);
 255     fb(current->frame_height_bits_minus_1 + 1, max_frame_height_minus_1);
 256
 257     if (current->reduced_still_picture_header)
 258         infer(frame_id_numbers_present_flag, 0);
 259     else
 260         flag(frame_id_numbers_present_flag);
 261     if (current->frame_id_numbers_present_flag) {
 262         fb(4, delta_frame_id_length_minus_2);
 263         fb(3, additional_frame_id_length_minus_1);
 264     }
 265
 266     flag(use_128x128_superblock);
 267     flag(enable_filter_intra);
 268     flag(enable_intra_edge_filter);
 269
 270     if (current->reduced_still_picture_header) {
 271         infer(enable_intraintra_compound, 0);
 272         infer(enable_masked_compound,     0);
 273         infer(enable_warped_motion,       0);
 274         infer(enable_dual_filter,         0);
 275         infer(enable_order_hint,          0);
 276         infer(enable_jnt_comp,            0);
 277         infer(enable_ref_frame_mvs,       0);
 278
 279         infer(seq_force_screen_content_tools,
 280               AV1_SELECT_SCREEN_CONTENT_TOOLS);
 281         infer(seq_force_integer_mv,
 282               AV1_SELECT_INTEGER_MV);
 283     } else {
 284         flag(enable_intraintra_compound);
 285         flag(enable_masked_compound);
 286         flag(enable_warped_motion);
 287         flag(enable_dual_filter);
 288
 289         flag(enable_order_hint);
 290         if (current->enable_order_hint) {
 291             flag(enable_jnt_comp);
 292             flag(enable_ref_frame_mvs);
 293         } else {
 294             infer(enable_jnt_comp,      0);
 295             infer(enable_ref_frame_mvs, 0);
 296         }
 297
 298         flag(seq_choose_screen_content_tools);
 299         if (current->seq_choose_screen_content_tools)
 300             infer(seq_force_screen_content_tools,
 301                   AV1_SELECT_SCREEN_CONTENT_TOOLS);
 302         else
 303             fb(1, seq_force_screen_content_tools);
 304         if (current->seq_force_screen_content_tools > 0) {
 305             flag(seq_choose_integer_mv);
 306             if (current->seq_choose_integer_mv)
 307                 infer(seq_force_integer_mv,
 308                       AV1_SELECT_INTEGER_MV);
 309             else
 310                 fb(1, seq_force_integer_mv);
 311         } else {
 312             infer(seq_force_integer_mv, AV1_SELECT_INTEGER_MV);
 313         }
 314
 315         if (current->enable_order_hint)
 316             fb(3, order_hint_bits_minus_1);
 317     }
 318
 319     flag(enable_superres);
 320     flag(enable_cdef);
 321     flag(enable_restoration);
 322
 323     CHECK(FUNC(color_config)(ctx, rw, &current->color_config,
 324                              current->seq_profile));
 325
 326     flag(film_grain_params_present);
 327
 328     return 0;
 329 }
 330
 331 static int FUNC(temporal_delimiter_obu)(CodedBitstreamContext *ctx, RWContext *rw)
 332 {
 333     CodedBitstreamAV1Context *priv = ctx->priv_data;
 334
 335     HEADER("Temporal Delimiter");
 336
 337     priv->seen_frame_header = 0;
 338
 339     return 0;
 340 }
 341
 342 static int FUNC(set_frame_refs)(CodedBitstreamContext *ctx, RWContext *rw,
 343                                 AV1RawFrameHeader *current)
 344 {
 345     CodedBitstreamAV1Context *priv = ctx->priv_data;
 346     const AV1RawSequenceHeader *seq = priv->sequence_header;
 347     static const uint8_t ref_frame_list[AV1_NUM_REF_FRAMES - 2] = {
 348         AV1_REF_FRAME_LAST2, AV1_REF_FRAME_LAST3, AV1_REF_FRAME_BWDREF,
 349         AV1_REF_FRAME_ALTREF2, AV1_REF_FRAME_ALTREF
 350     };
 351     int8_t ref_frame_idx[AV1_REFS_PER_FRAME], used_frame[AV1_NUM_REF_FRAMES];
 352     int8_t shifted_order_hints[AV1_NUM_REF_FRAMES];
 353     int cur_frame_hint, latest_order_hint, earliest_order_hint, ref;
 354     int i, j;
 355
 356     for (i = 0; i < AV1_REFS_PER_FRAME; i++)
 357         ref_frame_idx[i] = -1;
 358     ref_frame_idx[AV1_REF_FRAME_LAST - AV1_REF_FRAME_LAST] = current->last_frame_idx;
 359     ref_frame_idx[AV1_REF_FRAME_GOLDEN - AV1_REF_FRAME_LAST] = current->golden_frame_idx;
 360
 361     for (i = 0; i < AV1_NUM_REF_FRAMES; i++)
 362         used_frame[i] = 0;
 363     used_frame[current->last_frame_idx] = 1;
 364     used_frame[current->golden_frame_idx] = 1;
 365
 366     cur_frame_hint = 1 << (seq->order_hint_bits_minus_1);
 367     for (i = 0; i < AV1_NUM_REF_FRAMES; i++)
 368         shifted_order_hints[i] = cur_frame_hint +
 369                                  cbs_av1_get_relative_dist(seq, priv->ref[i].order_hint,
 370                                                            current->order_hint);
 371
 372     latest_order_hint = shifted_order_hints[current->last_frame_idx];
 373     earliest_order_hint = shifted_order_hints[current->golden_frame_idx];
 374
 375     ref = -1;
 376     for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
 377         int hint = shifted_order_hints[i];
 378         if (!used_frame[i] && hint >= cur_frame_hint &&
 379             (ref < 0 || hint >= latest_order_hint)) {
 380             ref = i;
 381             latest_order_hint = hint;
 382         }
 383     }
 384     if (ref >= 0) {
 385         ref_frame_idx[AV1_REF_FRAME_ALTREF - AV1_REF_FRAME_LAST] = ref;
 386         used_frame[ref] = 1;
 387     }
 388
 389     ref = -1;
 390     for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
 391         int hint = shifted_order_hints[i];
 392         if (!used_frame[i] && hint >= cur_frame_hint &&
 393             (ref < 0 || hint < earliest_order_hint)) {
 394             ref = i;
 395             earliest_order_hint = hint;
 396         }
 397     }
 398     if (ref >= 0) {
 399         ref_frame_idx[AV1_REF_FRAME_BWDREF - AV1_REF_FRAME_LAST] = ref;
 400         used_frame[ref] = 1;
 401     }
 402
 403     ref = -1;
 404     for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
 405         int hint = shifted_order_hints[i];
 406         if (!used_frame[i] && hint >= cur_frame_hint &&
 407             (ref < 0 || hint < earliest_order_hint)) {
 408             ref = i;
 409             earliest_order_hint = hint;
 410         }
 411     }
 412     if (ref >= 0) {
 413         ref_frame_idx[AV1_REF_FRAME_ALTREF2 - AV1_REF_FRAME_LAST] = ref;
 414         used_frame[ref] = 1;
 415     }
 416
 417     for (i = 0; i < AV1_REFS_PER_FRAME - 2; i++) {
 418         int ref_frame = ref_frame_list[i];
 419         if (ref_frame_idx[ref_frame - AV1_REF_FRAME_LAST] < 0 ) {
 420             ref = -1;
 421             for (j = 0; j < AV1_NUM_REF_FRAMES; j++) {
 422                 int hint = shifted_order_hints[j];
 423                 if (!used_frame[j] && hint < cur_frame_hint &&
 424                     (ref < 0 || hint >= latest_order_hint)) {
 425                     ref = j;
 426                     latest_order_hint = hint;
 427                 }
 428             }
 429             if (ref >= 0) {
 430                 ref_frame_idx[ref_frame - AV1_REF_FRAME_LAST] = ref;
 431                 used_frame[ref] = 1;
 432             }
 433         }
 434     }
 435
 436     ref = -1;
 437     for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
 438         int hint = shifted_order_hints[i];
 439         if (ref < 0 || hint < earliest_order_hint) {
 440             ref = i;
 441             earliest_order_hint = hint;
 442         }
 443     }
 444     for (i = 0; i < AV1_REFS_PER_FRAME; i++) {
 445         if (ref_frame_idx[i] < 0)
 446             ref_frame_idx[i] = ref;
 447         infer(ref_frame_idx[i], ref_frame_idx[i]);
 448     }
 449
 450     return 0;
 451 }
 452
 453 static int FUNC(superres_params)(CodedBitstreamContext *ctx, RWContext *rw,
 454                                  AV1RawFrameHeader *current)
 455 {
 456     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 457     const AV1RawSequenceHeader *seq = priv->sequence_header;
 458     int denom, err;
 459
 460     if (seq->enable_superres)
 461         flag(use_superres);
 462     else
 463         infer(use_superres, 0);
 464
 465     if (current->use_superres) {
 466         fb(3, coded_denom);
 467         denom = current->coded_denom + AV1_SUPERRES_DENOM_MIN;
 468     } else {
 469         denom = AV1_SUPERRES_NUM;
 470     }
 471
 472     priv->upscaled_width = priv->frame_width;
 473     priv->frame_width = (priv->upscaled_width * AV1_SUPERRES_NUM +
 474                          denom / 2) / denom;
 475
 476     return 0;
 477 }
 478
 479 static int FUNC(frame_size)(CodedBitstreamContext *ctx, RWContext *rw,
 480                             AV1RawFrameHeader *current)
 481 {
 482     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 483     const AV1RawSequenceHeader *seq = priv->sequence_header;
 484     int err;
 485
 486     if (current->frame_size_override_flag) {
 487         fb(seq->frame_width_bits_minus_1 + 1,  frame_width_minus_1);
 488         fb(seq->frame_height_bits_minus_1 + 1, frame_height_minus_1);
 489
 490         priv->frame_width  = current->frame_width_minus_1  + 1;
 491         priv->frame_height = current->frame_height_minus_1 + 1;
 492     } else {
 493         priv->frame_width  = seq->max_frame_width_minus_1  + 1;
 494         priv->frame_height = seq->max_frame_height_minus_1 + 1;
 495     }
 496
 497     CHECK(FUNC(superres_params)(ctx, rw, current));
 498
 499     return 0;
 500 }
 501
 502 static int FUNC(render_size)(CodedBitstreamContext *ctx, RWContext *rw,
 503                              AV1RawFrameHeader *current)
 504 {
 505     CodedBitstreamAV1Context *priv = ctx->priv_data;
 506     int err;
 507
 508     flag(render_and_frame_size_different);
 509
 510     if (current->render_and_frame_size_different) {
 511         fb(16, render_width_minus_1);
 512         fb(16, render_height_minus_1);
 513
 514         priv->render_width  = current->render_width_minus_1  + 1;
 515         priv->render_height = current->render_height_minus_1 + 1;
 516     } else {
 517         priv->render_width  = priv->upscaled_width;
 518         priv->render_height = priv->frame_height;
 519     }
 520
 521     return 0;
 522 }
 523
 524 static int FUNC(frame_size_with_refs)(CodedBitstreamContext *ctx, RWContext *rw,
 525                                       AV1RawFrameHeader *current)
 526 {
 527     CodedBitstreamAV1Context *priv = ctx->priv_data;
 528     int i, err;
 529
 530     for (i = 0; i < AV1_REFS_PER_FRAME; i++) {
 531         flags(found_ref[i], 1, i);
 532         if (current->found_ref[i]) {
 533             AV1ReferenceFrameState *ref;
 534
 535             if (current->ref_frame_idx[i] < 0 ||
 536                 !priv->ref[current->ref_frame_idx[i]].valid) {
 537                 av_log(ctx->log_ctx, AV_LOG_ERROR,
 538                        "Missing reference frame needed for frame size "
 539                        "(ref = %d, ref_frame_idx = %d).\n",
 540                        i, current->ref_frame_idx[i]);
 541                 return AVERROR_INVALIDDATA;
 542             }
 543             ref = &priv->ref[current->ref_frame_idx[i]];
 544
 545             priv->upscaled_width = ref->upscaled_width;
 546             priv->frame_width    = ref->frame_width;
 547             priv->frame_height   = ref->frame_height;
 548             priv->render_width   = ref->render_width;
 549             priv->render_height  = ref->render_height;
 550             break;
 551         }
 552     }
 553
 554     if (i >= AV1_REFS_PER_FRAME) {
 555         CHECK(FUNC(frame_size)(ctx, rw, current));
 556         CHECK(FUNC(render_size)(ctx, rw, current));
 557     } else {
 558         CHECK(FUNC(superres_params)(ctx, rw, current));
 559     }
 560
 561     return 0;
 562 }
 563
 564 static int FUNC(interpolation_filter)(CodedBitstreamContext *ctx, RWContext *rw,
 565                                       AV1RawFrameHeader *current)
 566 {
 567     int err;
 568
 569     flag(is_filter_switchable);
 570     if (current->is_filter_switchable)
 571         infer(interpolation_filter,
 572               AV1_INTERPOLATION_FILTER_SWITCHABLE);
 573     else
 574         fb(2, interpolation_filter);
 575
 576     return 0;
 577 }
 578
 579 static int FUNC(tile_info)(CodedBitstreamContext *ctx, RWContext *rw,
 580                            AV1RawFrameHeader *current)
 581 {
 582     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 583     const AV1RawSequenceHeader *seq = priv->sequence_header;
 584     int mi_cols, mi_rows, sb_cols, sb_rows, sb_shift, sb_size;
 585     int max_tile_width_sb, max_tile_height_sb, max_tile_area_sb;
 586     int min_log2_tile_cols, max_log2_tile_cols, max_log2_tile_rows;
 587     int min_log2_tiles, min_log2_tile_rows;
 588     int i, err;
 589
 590     mi_cols = 2 * ((priv->frame_width  + 7) >> 3);
 591     mi_rows = 2 * ((priv->frame_height + 7) >> 3);
 592
 593     sb_cols = seq->use_128x128_superblock ? ((mi_cols + 31) >> 5)
 594                                           : ((mi_cols + 15) >> 4);
 595     sb_rows = seq->use_128x128_superblock ? ((mi_rows + 31) >> 5)
 596                                           : ((mi_rows + 15) >> 4);
 597
 598     sb_shift = seq->use_128x128_superblock ? 5 : 4;
 599     sb_size  = sb_shift + 2;
 600
 601     max_tile_width_sb = AV1_MAX_TILE_WIDTH >> sb_size;
 602     max_tile_area_sb  = AV1_MAX_TILE_AREA  >> (2 * sb_size);
 603
 604     min_log2_tile_cols = cbs_av1_tile_log2(max_tile_width_sb, sb_cols);
 605     max_log2_tile_cols = cbs_av1_tile_log2(1, FFMIN(sb_cols, AV1_MAX_TILE_COLS));
 606     max_log2_tile_rows = cbs_av1_tile_log2(1, FFMIN(sb_rows, AV1_MAX_TILE_ROWS));
 607     min_log2_tiles = FFMAX(min_log2_tile_cols,
 608                            cbs_av1_tile_log2(max_tile_area_sb, sb_rows * sb_cols));
 609
 610     flag(uniform_tile_spacing_flag);
 611
 612     if (current->uniform_tile_spacing_flag) {
 613         int tile_width_sb, tile_height_sb;
 614
 615         increment(tile_cols_log2, min_log2_tile_cols, max_log2_tile_cols);
 616
 617         tile_width_sb = (sb_cols + (1 << current->tile_cols_log2) - 1) >>
 618             current->tile_cols_log2;
 619         current->tile_cols = (sb_cols + tile_width_sb - 1) / tile_width_sb;
 620
 621         min_log2_tile_rows = FFMAX(min_log2_tiles - current->tile_cols_log2, 0);
 622
 623         increment(tile_rows_log2, min_log2_tile_rows, max_log2_tile_rows);
 624
 625         tile_height_sb = (sb_rows + (1 << current->tile_rows_log2) - 1) >>
 626             current->tile_rows_log2;
 627         current->tile_rows = (sb_rows + tile_height_sb - 1) / tile_height_sb;
 628
 629     } else {
 630         int widest_tile_sb, start_sb, size_sb, max_width, max_height;
 631
 632         widest_tile_sb = 0;
 633
 634         start_sb = 0;
 635         for (i = 0; start_sb < sb_cols && i < AV1_MAX_TILE_COLS; i++) {
 636             max_width = FFMIN(sb_cols - start_sb, max_tile_width_sb);
 637             ns(max_width, width_in_sbs_minus_1[i], 1, i);
 638             size_sb = current->width_in_sbs_minus_1[i] + 1;
 639             widest_tile_sb = FFMAX(size_sb, widest_tile_sb);
 640             start_sb += size_sb;
 641         }
 642         current->tile_cols_log2 = cbs_av1_tile_log2(1, i);
 643         current->tile_cols = i;
 644
 645         if (min_log2_tiles > 0)
 646             max_tile_area_sb = (sb_rows * sb_cols) >> (min_log2_tiles + 1);
 647         else
 648             max_tile_area_sb = sb_rows * sb_cols;
 649         max_tile_height_sb = FFMAX(max_tile_area_sb / widest_tile_sb, 1);
 650
 651         start_sb = 0;
 652         for (i = 0; start_sb < sb_rows && i < AV1_MAX_TILE_ROWS; i++) {
 653             max_height = FFMIN(sb_rows - start_sb, max_tile_height_sb);
 654             ns(max_height, height_in_sbs_minus_1[i], 1, i);
 655             size_sb = current->height_in_sbs_minus_1[i] + 1;
 656             start_sb += size_sb;
 657         }
 658         current->tile_rows_log2 = cbs_av1_tile_log2(1, i);
 659         current->tile_rows = i;
 660     }
 661
 662     if (current->tile_cols_log2 > 0 ||
 663         current->tile_rows_log2 > 0) {
 664         fb(current->tile_cols_log2 + current->tile_rows_log2,
 665            context_update_tile_id);
 666         fb(2, tile_size_bytes_minus1);
 667     } else {
 668         infer(context_update_tile_id, 0);
 669     }
 670
 671     priv->tile_cols = current->tile_cols;
 672     priv->tile_rows = current->tile_rows;
 673
 674     return 0;
 675 }
 676
 677 static int FUNC(quantization_params)(CodedBitstreamContext *ctx, RWContext *rw,
 678                                      AV1RawFrameHeader *current)
 679 {
 680     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 681     const AV1RawSequenceHeader *seq = priv->sequence_header;
 682     int err;
 683
 684     fb(8, base_q_idx);
 685
 686     delta_q(delta_q_y_dc);
 687
 688     if (priv->num_planes > 1) {
 689         if (seq->color_config.separate_uv_delta_q)
 690             flag(diff_uv_delta);
 691         else
 692             infer(diff_uv_delta, 0);
 693
 694         delta_q(delta_q_u_dc);
 695         delta_q(delta_q_u_ac);
 696
 697         if (current->diff_uv_delta) {
 698             delta_q(delta_q_v_dc);
 699             delta_q(delta_q_v_ac);
 700         } else {
 701             infer(delta_q_v_dc, current->delta_q_u_dc);
 702             infer(delta_q_v_ac, current->delta_q_u_ac);
 703         }
 704     } else {
 705         infer(delta_q_u_dc, 0);
 706         infer(delta_q_u_ac, 0);
 707         infer(delta_q_v_dc, 0);
 708         infer(delta_q_v_ac, 0);
 709     }
 710
 711     flag(using_qmatrix);
 712     if (current->using_qmatrix) {
 713         fb(4, qm_y);
 714         fb(4, qm_u);
 715         if (seq->color_config.separate_uv_delta_q)
 716             fb(4, qm_v);
 717         else
 718             infer(qm_v, current->qm_u);
 719     }
 720
 721     return 0;
 722 }
 723
 724 static int FUNC(segmentation_params)(CodedBitstreamContext *ctx, RWContext *rw,
 725                                      AV1RawFrameHeader *current)
 726 {
 727     static const uint8_t bits[AV1_SEG_LVL_MAX] = { 8, 6, 6, 6, 6, 3, 0, 0 };
 728     static const uint8_t sign[AV1_SEG_LVL_MAX] = { 1, 1, 1, 1, 1, 0, 0, 0 };
 729     int i, j, err;
 730
 731     flag(segmentation_enabled);
 732
 733     if (current->segmentation_enabled) {
 734         if (current->primary_ref_frame == AV1_PRIMARY_REF_NONE) {
 735             infer(segmentation_update_map,      1);
 736             infer(segmentation_temporal_update, 0);
 737             infer(segmentation_update_data,     1);
 738         } else {
 739             flag(segmentation_update_map);
 740             if (current->segmentation_update_map)
 741                 flag(segmentation_temporal_update);
 742             else
 743                 infer(segmentation_temporal_update, 0);
 744             flag(segmentation_update_data);
 745         }
 746
 747         if (current->segmentation_update_data) {
 748             for (i = 0; i < AV1_MAX_SEGMENTS; i++) {
 749                 for (j = 0; j < AV1_SEG_LVL_MAX; j++) {
 750                     flags(feature_enabled[i][j], 2, i, j);
 751
 752                     if (current->feature_enabled[i][j] && bits[j] > 0) {
 753                         if (sign[j])
 754                             sus(1 + bits[j], feature_value[i][j], 2, i, j);
 755                         else
 756                             fbs(bits[j], feature_value[i][j], 2, i, j);
 757                     } else {
 758                         infer(feature_value[i][j], 0);
 759                     }
 760                 }
 761             }
 762         }
 763     } else {
 764         for (i = 0; i < AV1_MAX_SEGMENTS; i++) {
 765             for (j = 0; j < AV1_SEG_LVL_MAX; j++) {
 766                 infer(feature_enabled[i][j], 0);
 767                 infer(feature_value[i][j],   0);
 768             }
 769         }
 770     }
 771
 772     return 0;
 773 }
 774
 775 static int FUNC(delta_q_params)(CodedBitstreamContext *ctx, RWContext *rw,
 776                                 AV1RawFrameHeader *current)
 777 {
 778     int err;
 779
 780     if (current->base_q_idx > 0)
 781         flag(delta_q_present);
 782     else
 783         infer(delta_q_present, 0);
 784
 785     if (current->delta_q_present)
 786         fb(2, delta_q_res);
 787
 788     return 0;
 789 }
 790
 791 static int FUNC(delta_lf_params)(CodedBitstreamContext *ctx, RWContext *rw,
 792                                  AV1RawFrameHeader *current)
 793 {
 794     int err;
 795
 796     if (current->delta_q_present) {
 797         if (!current->allow_intrabc)
 798             flag(delta_lf_present);
 799         else
 800             infer(delta_lf_present, 0);
 801         if (current->delta_lf_present) {
 802             fb(2, delta_lf_res);
 803             flag(delta_lf_multi);
 804         } else {
 805             infer(delta_lf_res,   0);
 806             infer(delta_lf_multi, 0);
 807         }
 808     } else {
 809         infer(delta_lf_present, 0);
 810         infer(delta_lf_res,     0);
 811         infer(delta_lf_multi,   0);
 812     }
 813
 814     return 0;
 815 }
 816
 817 static int FUNC(loop_filter_params)(CodedBitstreamContext *ctx, RWContext *rw,
 818                                     AV1RawFrameHeader *current)
 819 {
 820     CodedBitstreamAV1Context *priv = ctx->priv_data;
 821     int i, err;
 822
 823     if (priv->coded_lossless || current->allow_intrabc) {
 824         infer(loop_filter_level[0], 0);
 825         infer(loop_filter_level[1], 0);
 826         infer(loop_filter_ref_deltas[AV1_REF_FRAME_INTRA],    1);
 827         infer(loop_filter_ref_deltas[AV1_REF_FRAME_LAST],     0);
 828         infer(loop_filter_ref_deltas[AV1_REF_FRAME_LAST2],    0);
 829         infer(loop_filter_ref_deltas[AV1_REF_FRAME_LAST3],    0);
 830         infer(loop_filter_ref_deltas[AV1_REF_FRAME_BWDREF],   0);
 831         infer(loop_filter_ref_deltas[AV1_REF_FRAME_GOLDEN],  -1);
 832         infer(loop_filter_ref_deltas[AV1_REF_FRAME_ALTREF],  -1);
 833         infer(loop_filter_ref_deltas[AV1_REF_FRAME_ALTREF2], -1);
 834         for (i = 0; i < 2; i++)
 835             infer(loop_filter_mode_deltas[i], 0);
 836         return 0;
 837     }
 838
 839     fb(6, loop_filter_level[0]);
 840     fb(6, loop_filter_level[1]);
 841
 842     if (priv->num_planes > 1) {
 843         if (current->loop_filter_level[0] ||
 844             current->loop_filter_level[1]) {
 845             fb(6, loop_filter_level[2]);
 846             fb(6, loop_filter_level[3]);
 847         }
 848     }
 849
 850     fb(3, loop_filter_sharpness);
 851
 852     flag(loop_filter_delta_enabled);
 853     if (current->loop_filter_delta_enabled) {
 854         flag(loop_filter_delta_update);
 855         if (current->loop_filter_delta_update) {
 856             for (i = 0; i < AV1_TOTAL_REFS_PER_FRAME; i++) {
 857                 flags(update_ref_delta[i], 1, i);
 858                 if (current->update_ref_delta[i])
 859                     sus(1 + 6, loop_filter_ref_deltas[i], 1, i);
 860             }
 861             for (i = 0; i < 2; i++) {
 862                 flags(update_mode_delta[i], 1, i);
 863                 if (current->update_mode_delta[i])
 864                     sus(1 + 6, loop_filter_mode_deltas[i], 1, i);
 865             }
 866         }
 867     }
 868
 869     return 0;
 870 }
 871
 872 static int FUNC(cdef_params)(CodedBitstreamContext *ctx, RWContext *rw,
 873                              AV1RawFrameHeader *current)
 874 {
 875     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 876     const AV1RawSequenceHeader *seq = priv->sequence_header;
 877     int i, err;
 878
 879     if (priv->coded_lossless || current->allow_intrabc ||
 880         !seq->enable_cdef) {
 881         infer(cdef_damping_minus_3, 0);
 882         infer(cdef_bits, 0);
 883         infer(cdef_y_pri_strength[0],  0);
 884         infer(cdef_y_sec_strength[0],  0);
 885         infer(cdef_uv_pri_strength[0], 0);
 886         infer(cdef_uv_sec_strength[0], 0);
 887
 888         return 0;
 889     }
 890
 891     fb(2, cdef_damping_minus_3);
 892     fb(2, cdef_bits);
 893
 894     for (i = 0; i < (1 << current->cdef_bits); i++) {
 895         fbs(4, cdef_y_pri_strength[i], 1, i);
 896         fbs(2, cdef_y_sec_strength[i], 1, i);
 897
 898         if (priv->num_planes > 1) {
 899             fbs(4, cdef_uv_pri_strength[i], 1, i);
 900             fbs(2, cdef_uv_sec_strength[i], 1, i);
 901         }
 902     }
 903
 904     return 0;
 905 }
 906
 907 static int FUNC(lr_params)(CodedBitstreamContext *ctx, RWContext *rw,
 908                            AV1RawFrameHeader *current)
 909 {
 910     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 911     const AV1RawSequenceHeader *seq = priv->sequence_header;
 912     int uses_lr,  uses_chroma_lr;
 913     int i, err;
 914
 915     if (priv->all_lossless || current->allow_intrabc ||
 916         !seq->enable_restoration) {
 917         return 0;
 918     }
 919
 920     uses_lr = uses_chroma_lr = 0;
 921     for (i = 0; i < priv->num_planes; i++) {
 922         fbs(2, lr_type[i], 1, i);
 923
 924         if (current->lr_type[i] != 0) {
 925             uses_lr = 1;
 926             if (i > 0)
 927                 uses_chroma_lr = 1;
 928         }
 929     }
 930
 931     if (uses_lr) {
 932         if (seq->use_128x128_superblock)
 933             increment(lr_unit_shift, 1, 2);
 934         else
 935             increment(lr_unit_shift, 0, 2);
 936
 937         if(seq->color_config.subsampling_x &&
 938            seq->color_config.subsampling_y && uses_chroma_lr) {
 939             fb(1, lr_uv_shift);
 940         } else {
 941             infer(lr_uv_shift, 0);
 942         }
 943     }
 944
 945     return 0;
 946 }
 947
 948 static int FUNC(read_tx_mode)(CodedBitstreamContext *ctx, RWContext *rw,
 949                               AV1RawFrameHeader *current)
 950 {
 951     CodedBitstreamAV1Context *priv = ctx->priv_data;
 952     int err;
 953
 954     if (priv->coded_lossless)
 955         infer(tx_mode, 0);
 956     else
 957         increment(tx_mode, 1, 2);
 958
 959     return 0;
 960 }
 961
 962 static int FUNC(frame_reference_mode)(CodedBitstreamContext *ctx, RWContext *rw,
 963                                       AV1RawFrameHeader *current)
 964 {
 965     int err;
 966
 967     if (current->frame_type == AV1_FRAME_INTRA_ONLY ||
 968         current->frame_type == AV1_FRAME_KEY)
 969         infer(reference_select, 0);
 970     else
 971         flag(reference_select);
 972
 973     return 0;
 974 }
 975
 976 static int FUNC(skip_mode_params)(CodedBitstreamContext *ctx, RWContext *rw,
 977                                   AV1RawFrameHeader *current)
 978 {
 979     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 980     const AV1RawSequenceHeader *seq = priv->sequence_header;
 981     int skip_mode_allowed;
 982     int err;
 983
 984     if (current->frame_type == AV1_FRAME_KEY ||
 985         current->frame_type == AV1_FRAME_INTRA_ONLY ||
 986         !current->reference_select || !seq->enable_order_hint) {
 987         skip_mode_allowed = 0;
 988     } else {
 989         int forward_idx,  backward_idx;
 990         int forward_hint, backward_hint;
 991         int ref_hint, dist, i;
 992
 993         forward_idx  = -1;
 994         backward_idx = -1;
 995         for (i = 0; i < AV1_REFS_PER_FRAME; i++) {
 996             ref_hint = priv->ref[current->ref_frame_idx[i]].order_hint;
 997             dist = cbs_av1_get_relative_dist(seq, ref_hint,
 998                                              current->order_hint);
 999             if (dist < 0) {
1000                 if (forward_idx < 0 ||
1001                     cbs_av1_get_relative_dist(seq, ref_hint,
1002                                               forward_hint) > 0) {
1003                     forward_idx  = i;
1004                     forward_hint = ref_hint;
1005                 }
1006             } else if (dist > 0) {
1007                 if (backward_idx < 0 ||
1008                     cbs_av1_get_relative_dist(seq, ref_hint,
1009                                               backward_hint) < 0) {
1010                     backward_idx  = i;
1011                     backward_hint = ref_hint;
1012                 }
1013             }
1014         }
1015
1016         if (forward_idx < 0) {
1017             skip_mode_allowed = 0;
1018         } else if (backward_idx >= 0) {
1019             skip_mode_allowed = 1;
1020             // Frames for skip mode are forward_idx and backward_idx.
1021         } else {
1022             int second_forward_idx;
1023             int second_forward_hint;
1024
1025             second_forward_idx = -1;
1026             for (i = 0; i < AV1_REFS_PER_FRAME; i++) {
1027                 ref_hint = priv->ref[current->ref_frame_idx[i]].order_hint;
1028                 if (cbs_av1_get_relative_dist(seq, ref_hint,
1029                                               forward_hint) < 0) {
1030                     if (second_forward_idx < 0 ||
1031                         cbs_av1_get_relative_dist(seq, ref_hint,
1032                                                   second_forward_hint) > 0) {
1033                         second_forward_idx  = i;
1034                         second_forward_hint = ref_hint;
1035                     }
1036                 }
1037             }
1038
1039             if (second_forward_idx < 0) {
1040                 skip_mode_allowed = 0;
1041             } else {
1042                 skip_mode_allowed = 1;
1043                 // Frames for skip mode are forward_idx and second_forward_idx.
1044             }
1045         }
1046     }
1047
1048     if (skip_mode_allowed)
1049         flag(skip_mode_present);
1050     else
1051         infer(skip_mode_present, 0);
1052
1053     return 0;
1054 }
1055
1056 static int FUNC(global_motion_param)(CodedBitstreamContext *ctx, RWContext *rw,
1057                                      AV1RawFrameHeader *current,
1058                                      int type, int ref, int idx)
1059 {
1060     uint32_t abs_bits, prec_bits, num_syms;
1061     int err;
1062
1063     if (idx < 2) {
1064         if (type == AV1_WARP_MODEL_TRANSLATION) {
1065             abs_bits  = AV1_GM_ABS_TRANS_ONLY_BITS  - !current->allow_high_precision_mv;
1066             prec_bits = AV1_GM_TRANS_ONLY_PREC_BITS - !current->allow_high_precision_mv;
1067         } else {
1068             abs_bits  = AV1_GM_ABS_TRANS_BITS;
1069             prec_bits = AV1_GM_TRANS_PREC_BITS;
1070         }
1071     } else {
1072         abs_bits  = AV1_GM_ABS_ALPHA_BITS;
1073         prec_bits = AV1_GM_ALPHA_PREC_BITS;
1074     }
1075
1076     num_syms = 2 * (1 << abs_bits) + 1;
1077     subexp(gm_params[ref][idx], num_syms, 2, ref, idx);
1078
1079     // Actual gm_params value is not reconstructed here.
1080     (void)prec_bits;
1081
1082     return 0;
1083 }
1084
1085 static int FUNC(global_motion_params)(CodedBitstreamContext *ctx, RWContext *rw,
1086                                       AV1RawFrameHeader *current)
1087 {
1088     int ref, type;
1089     int err;
1090
1091     if (current->frame_type == AV1_FRAME_KEY ||
1092         current->frame_type == AV1_FRAME_INTRA_ONLY)
1093         return 0;
1094
1095     for (ref = AV1_REF_FRAME_LAST; ref <= AV1_REF_FRAME_ALTREF; ref++) {
1096         flags(is_global[ref], 1, ref);
1097         if (current->is_global[ref]) {
1098             flags(is_rot_zoom[ref], 1, ref);
1099             if (current->is_rot_zoom[ref]) {
1100                 type = AV1_WARP_MODEL_ROTZOOM;
1101             } else {
1102                 flags(is_translation[ref], 1, ref);
1103                 type = current->is_translation[ref] ? AV1_WARP_MODEL_TRANSLATION
1104                                                     : AV1_WARP_MODEL_AFFINE;
1105             }
1106         } else {
1107             type = AV1_WARP_MODEL_IDENTITY;
1108         }
1109
1110         if (type >= AV1_WARP_MODEL_ROTZOOM) {
1111             CHECK(FUNC(global_motion_param)(ctx, rw, current, type, ref, 2));
1112             CHECK(FUNC(global_motion_param)(ctx, rw, current, type, ref, 3));
1113             if (type == AV1_WARP_MODEL_AFFINE) {
1114                 CHECK(FUNC(global_motion_param)(ctx, rw, current, type, ref, 4));
1115                 CHECK(FUNC(global_motion_param)(ctx, rw, current, type, ref, 5));
1116             } else {
1117                 // gm_params[ref][4] = -gm_params[ref][3]
1118                 // gm_params[ref][5] =  gm_params[ref][2]
1119             }
1120         }
1121         if (type >= AV1_WARP_MODEL_TRANSLATION) {
1122             CHECK(FUNC(global_motion_param)(ctx, rw, current, type, ref, 0));
1123             CHECK(FUNC(global_motion_param)(ctx, rw, current, type, ref, 1));
1124         }
1125     }
1126
1127     return 0;
1128 }
1129
1130 static int FUNC(film_grain_params)(CodedBitstreamContext *ctx, RWContext *rw,
1131                                    AV1RawFrameHeader *current)
1132 {
1133     CodedBitstreamAV1Context  *priv = ctx->priv_data;
1134     const AV1RawSequenceHeader *seq = priv->sequence_header;
1135     int num_pos_luma, num_pos_chroma;
1136     int i, err;
1137
1138     if (!seq->film_grain_params_present ||
1139         (!current->show_frame && !current->showable_frame))
1140         return 0;
1141
1142     flag(apply_grain);
1143
1144     if (!current->apply_grain)
1145         return 0;
1146
1147     fb(16, grain_seed);
1148
1149     if (current->frame_type == AV1_FRAME_INTER)
1150         flag(update_grain);
1151     else
1152         infer(update_grain, 1);
1153
1154     if (!current->update_grain) {
1155         fb(3, film_grain_params_ref_idx);
1156         return 0;
1157     }
1158
1159     fb(4, num_y_points);
1160     for (i = 0; i < current->num_y_points; i++) {
1161         fbs(8, point_y_value[i],   1, i);
1162         fbs(8, point_y_scaling[i], 1, i);
1163     }
1164
1165     if (seq->color_config.mono_chrome)
1166         infer(chroma_scaling_from_luma, 0);
1167     else
1168         flag(chroma_scaling_from_luma);
1169
1170     if (seq->color_config.mono_chrome ||
1171         current->chroma_scaling_from_luma ||
1172         (seq->color_config.subsampling_x == 1 &&
1173          seq->color_config.subsampling_y == 1 &&
1174          current->num_y_points == 0)) {
1175         infer(num_cb_points, 0);
1176         infer(num_cr_points, 0);
1177     } else {
1178         fb(4, num_cb_points);
1179         for (i = 0; i < current->num_cb_points; i++) {
1180             fbs(8, point_cb_value[i],   1, i);
1181             fbs(8, point_cb_scaling[i], 1, i);
1182         }
1183         fb(4, num_cr_points);
1184         for (i = 0; i < current->num_cr_points; i++) {
1185             fbs(8, point_cr_value[i],   1, i);
1186             fbs(8, point_cr_scaling[i], 1, i);
1187         }
1188     }
1189
1190     fb(2, grain_scaling_minus_8);
1191     fb(2, ar_coeff_lag);
1192     num_pos_luma = 2 * current->ar_coeff_lag * (current->ar_coeff_lag + 1);
1193     if (current->num_y_points) {
1194         num_pos_chroma = num_pos_luma + 1;
1195         for (i = 0; i < num_pos_luma; i++)
1196             fbs(8, ar_coeffs_y_plus_128[i], 1, i);
1197     } else {
1198         num_pos_chroma = num_pos_luma;
1199     }
1200     if (current->chroma_scaling_from_luma || current->num_cb_points) {
1201         for (i = 0; i < num_pos_chroma; i++)
1202             fbs(8, ar_coeffs_cb_plus_128[i], 1, i);
1203     }
1204     if (current->chroma_scaling_from_luma || current->num_cr_points) {
1205         for (i = 0; i < num_pos_chroma; i++)
1206             fbs(8, ar_coeffs_cr_plus_128[i], 1, i);
1207     }
1208     fb(2, ar_coeff_shift_minus_6);
1209     fb(2, grain_scale_shift);
1210     if (current->num_cb_points) {
1211         fb(8, cb_mult);
1212         fb(8, cb_luma_mult);
1213         fb(9, cb_offset);
1214     }
1215     if (current->num_cr_points) {
1216         fb(8, cr_mult);
1217         fb(8, cr_luma_mult);
1218         fb(9, cr_offset);
1219     }
1220
1221     flag(overlap_flag);
1222     flag(clip_to_restricted_range);
1223
1224     return 0;
1225 }
1226
1227 static int FUNC(uncompressed_header)(CodedBitstreamContext *ctx, RWContext *rw,
1228                                      AV1RawFrameHeader *current)
1229 {
1230     CodedBitstreamAV1Context *priv = ctx->priv_data;
1231     const AV1RawSequenceHeader *seq;
1232     int id_len, diff_len, all_frames, frame_is_intra, order_hint_bits;
1233     int i, err;
1234
1235     if (!priv->sequence_header) {
1236         av_log(ctx->log_ctx, AV_LOG_ERROR, "No sequence header available: "
1237                "unable to decode frame header.\n");
1238         return AVERROR_INVALIDDATA;
1239     }
1240     seq = priv->sequence_header;
1241
1242     id_len = seq->additional_frame_id_length_minus_1 +
1243              seq->delta_frame_id_length_minus_2 + 3;
1244     all_frames = (1 << AV1_NUM_REF_FRAMES) - 1;
1245
1246     if (seq->reduced_still_picture_header) {
1247         infer(show_existing_frame, 0);
1248         infer(frame_type,     AV1_FRAME_KEY);
1249         infer(show_frame,     1);
1250         infer(showable_frame, 0);
1251         frame_is_intra = 1;
1252
1253     } else {
1254         flag(show_existing_frame);
1255
1256         if (current->show_existing_frame) {
1257             AV1ReferenceFrameState *frame;
1258
1259             fb(3, frame_to_show_map_idx);
1260             frame = &priv->ref[current->frame_to_show_map_idx];
1261
1262             if (seq->decoder_model_info_present_flag &&
1263                 !seq->timing_info.equal_picture_interval) {
1264                 fb(seq->decoder_model_info.frame_presentation_time_length_minus_1 + 1,
1265                    frame_presentation_time);
1266             }
1267
1268             if (seq->frame_id_numbers_present_flag)
1269                 fb(id_len, display_frame_id);
1270
1271             if (frame->frame_type == AV1_FRAME_KEY)
1272                 infer(refresh_frame_flags, all_frames);
1273             else
1274                 infer(refresh_frame_flags, 0);
1275
1276             return 0;
1277         }
1278
1279         fb(2, frame_type);
1280         frame_is_intra = (current->frame_type == AV1_FRAME_INTRA_ONLY ||
1281                           current->frame_type == AV1_FRAME_KEY);
1282
1283         flag(show_frame);
1284         if (current->show_frame &&
1285             seq->decoder_model_info_present_flag &&
1286             !seq->timing_info.equal_picture_interval) {
1287             fb(seq->decoder_model_info.frame_presentation_time_length_minus_1 + 1,
1288                frame_presentation_time);
1289         }
1290         if (current->show_frame)
1291             infer(showable_frame, current->frame_type != AV1_FRAME_KEY);
1292         else
1293             flag(showable_frame);
1294
1295         if (current->frame_type == AV1_FRAME_SWITCH ||
1296             (current->frame_type == AV1_FRAME_KEY && current->show_frame))
1297             infer(error_resilient_mode, 1);
1298         else
1299             flag(error_resilient_mode);
1300     }
1301
1302     if (current->frame_type == AV1_FRAME_KEY && current->show_frame) {
1303         for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
1304             priv->ref[i].valid = 0;
1305             priv->ref[i].order_hint = 0;
1306         }
1307     }
1308
1309     flag(disable_cdf_update);
1310
1311     if (seq->seq_force_screen_content_tools ==
1312         AV1_SELECT_SCREEN_CONTENT_TOOLS) {
1313         flag(allow_screen_content_tools);
1314     } else {
1315         infer(allow_screen_content_tools,
1316               seq->seq_force_screen_content_tools);
1317     }
1318     if (current->allow_screen_content_tools) {
1319         if (seq->seq_force_integer_mv == AV1_SELECT_INTEGER_MV)
1320             flag(force_integer_mv);
1321         else
1322             infer(force_integer_mv, seq->seq_force_integer_mv);
1323     } else {
1324         infer(force_integer_mv, 0);
1325     }
1326
1327     if (seq->frame_id_numbers_present_flag) {
1328         fb(id_len, current_frame_id);
1329
1330         diff_len = seq->delta_frame_id_length_minus_2 + 2;
1331         for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
1332             if (current->current_frame_id > (1 << diff_len)) {
1333                 if (priv->ref[i].frame_id > current->current_frame_id ||
1334                     priv->ref[i].frame_id < (current->current_frame_id -
1335                                              (1 << diff_len)))
1336                     priv->ref[i].valid = 0;
1337             } else {
1338                 if (priv->ref[i].frame_id > current->current_frame_id &&
1339                     priv->ref[i].frame_id < ((1 << id_len) +
1340                                              current->current_frame_id -
1341                                              (1 << diff_len)))
1342                     priv->ref[i].valid = 0;
1343             }
1344         }
1345     } else {
1346         infer(current_frame_id, 0);
1347     }
1348
1349     if (current->frame_type == AV1_FRAME_SWITCH)
1350         infer(frame_size_override_flag, 1);
1351     else if(seq->reduced_still_picture_header)
1352         infer(frame_size_override_flag, 0);
1353     else
1354         flag(frame_size_override_flag);
1355
1356     order_hint_bits =
1357         seq->enable_order_hint ? seq->order_hint_bits_minus_1 + 1 : 0;
1358     if (order_hint_bits > 0)
1359         fb(order_hint_bits, order_hint);
1360     else
1361         infer(order_hint, 0);
1362
1363     if (frame_is_intra || current->error_resilient_mode)
1364         infer(primary_ref_frame, AV1_PRIMARY_REF_NONE);
1365     else
1366         fb(3, primary_ref_frame);
1367
1368     if (seq->decoder_model_info_present_flag) {
1369         flag(buffer_removal_time_present_flag);
1370         if (current->buffer_removal_time_present_flag) {
1371             for (i = 0; i <= seq->operating_points_cnt_minus_1; i++) {
1372                 if (seq->decoder_model_present_for_this_op[i]) {
1373                     int op_pt_idc = seq->operating_point_idc[i];
1374                     int in_temporal_layer = (op_pt_idc >>  priv->temporal_id    ) & 1;
1375                     int in_spatial_layer  = (op_pt_idc >> (priv->spatial_id + 8)) & 1;
1376                     if (seq->operating_point_idc[i] == 0 ||
1377                         in_temporal_layer || in_spatial_layer) {
1378                         fbs(seq->decoder_model_info.buffer_removal_time_length_minus_1 + 1,
1379                             buffer_removal_time[i], 1, i);
1380                     }
1381                 }
1382             }
1383         }
1384     }
1385
1386     if (current->frame_type == AV1_FRAME_SWITCH ||
1387         (current->frame_type == AV1_FRAME_KEY && current->show_frame))
1388         infer(refresh_frame_flags, all_frames);
1389     else
1390         fb(8, refresh_frame_flags);
1391
1392     if (!frame_is_intra || current->refresh_frame_flags != all_frames) {
1393         if (current->error_resilient_mode && seq->enable_order_hint) {
1394             for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
1395                 fbs(order_hint_bits, ref_order_hint[i], 1, i);
1396                 if (current->ref_order_hint[i] != priv->ref[i].order_hint)
1397                     priv->ref[i].valid = 0;
1398             }
1399         }
1400     }
1401
1402     if (current->frame_type == AV1_FRAME_KEY ||
1403         current->frame_type == AV1_FRAME_INTRA_ONLY) {
1404         CHECK(FUNC(frame_size)(ctx, rw, current));
1405         CHECK(FUNC(render_size)(ctx, rw, current));
1406
1407         if (current->allow_screen_content_tools &&
1408             priv->upscaled_width == priv->frame_width)
1409             flag(allow_intrabc);
1410         else
1411             infer(allow_intrabc, 0);
1412
1413     } else {
1414         if (!seq->enable_order_hint) {
1415             infer(frame_refs_short_signaling, 0);
1416         } else {
1417             flag(frame_refs_short_signaling);
1418             if (current->frame_refs_short_signaling) {
1419                 fb(3, last_frame_idx);
1420                 fb(3, golden_frame_idx);
1421                 CHECK(FUNC(set_frame_refs)(ctx, rw, current));
1422             }
1423         }
1424
1425         for (i = 0; i < AV1_REFS_PER_FRAME; i++) {
1426             if (!current->frame_refs_short_signaling)
1427                 fbs(3, ref_frame_idx[i], 1, i);
1428             if (seq->frame_id_numbers_present_flag) {
1429                 fbs(seq->delta_frame_id_length_minus_2 + 2,
1430                     delta_frame_id_minus1[i], 1, i);
1431             }
1432         }
1433
1434         if (current->frame_size_override_flag &&
1435             !current->error_resilient_mode) {
1436             CHECK(FUNC(frame_size_with_refs)(ctx, rw, current));
1437         } else {
1438             CHECK(FUNC(frame_size)(ctx, rw, current));
1439             CHECK(FUNC(render_size)(ctx, rw, current));
1440         }
1441
1442         if (current->force_integer_mv)
1443             infer(allow_high_precision_mv, 0);
1444         else
1445             flag(allow_high_precision_mv);
1446
1447         CHECK(FUNC(interpolation_filter)(ctx, rw, current));
1448
1449         flag(is_motion_mode_switchable);
1450
1451         if (current->error_resilient_mode ||
1452             !seq->enable_ref_frame_mvs)
1453             infer(use_ref_frame_mvs, 0);
1454         else
1455             flag(use_ref_frame_mvs);
1456
1457         infer(allow_intrabc, 0);
1458     }
1459
1460     if (!frame_is_intra) {
1461         // Derive reference frame sign biases.
1462     }
1463
1464     if (seq->reduced_still_picture_header || current->disable_cdf_update)
1465         infer(disable_frame_end_update_cdf, 1);
1466     else
1467         flag(disable_frame_end_update_cdf);
1468
1469     if (current->primary_ref_frame == AV1_PRIMARY_REF_NONE) {
1470         // Init non-coeff CDFs.
1471         // Setup past independence.
1472     } else {
1473         // Load CDF tables from previous frame.
1474         // Load params from previous frame.
1475     }
1476
1477     if (current->use_ref_frame_mvs) {
1478         // Perform motion field estimation process.
1479     }
1480
1481     CHECK(FUNC(tile_info)(ctx, rw, current));
1482
1483     CHECK(FUNC(quantization_params)(ctx, rw, current));
1484
1485     CHECK(FUNC(segmentation_params)(ctx, rw, current));
1486
1487     CHECK(FUNC(delta_q_params)(ctx, rw, current));
1488
1489     CHECK(FUNC(delta_lf_params)(ctx, rw, current));
1490
1491     // Init coeff CDFs / load previous segments.
1492
1493     priv->coded_lossless = 1;
1494     for (i = 0; i < AV1_MAX_SEGMENTS; i++) {
1495         int qindex;
1496         if (current->feature_enabled[i][AV1_SEG_LVL_ALT_Q]) {
1497             qindex = (current->base_q_idx +
1498                       current->feature_value[i][AV1_SEG_LVL_ALT_Q]);
1499         } else {
1500             qindex = current->base_q_idx;
1501         }
1502         qindex = av_clip_uintp2(qindex, 8);
1503
1504         if (qindex                || current->delta_q_y_dc ||
1505             current->delta_q_u_ac || current->delta_q_u_dc ||
1506             current->delta_q_v_ac || current->delta_q_v_dc) {
1507             priv->coded_lossless = 0;
1508         }
1509     }
1510     priv->all_lossless = priv->coded_lossless &&
1511         priv->frame_width == priv->upscaled_width;
1512
1513     CHECK(FUNC(loop_filter_params)(ctx, rw, current));
1514
1515     CHECK(FUNC(cdef_params)(ctx, rw, current));
1516
1517     CHECK(FUNC(lr_params)(ctx, rw, current));
1518
1519     CHECK(FUNC(read_tx_mode)(ctx, rw, current));
1520
1521     CHECK(FUNC(frame_reference_mode)(ctx, rw, current));
1522
1523     CHECK(FUNC(skip_mode_params)(ctx, rw, current));
1524
1525     if (frame_is_intra || current->error_resilient_mode ||
1526         !seq->enable_warped_motion)
1527         infer(allow_warped_motion, 0);
1528     else
1529         flag(allow_warped_motion);
1530
1531     flag(reduced_tx_set);
1532
1533     CHECK(FUNC(global_motion_params)(ctx, rw, current));
1534
1535     CHECK(FUNC(film_grain_params)(ctx, rw, current));
1536
1537     for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
1538         if (current->refresh_frame_flags & (1 << i)) {
1539             priv->ref[i] = (AV1ReferenceFrameState) {
1540                 .valid          = 1,
1541                 .frame_id       = current->current_frame_id,
1542                 .upscaled_width = priv->upscaled_width,
1543                 .frame_width    = priv->frame_width,
1544                 .frame_height   = priv->frame_height,
1545                 .render_width   = priv->render_width,
1546                 .render_height  = priv->render_height,
1547                 .frame_type     = current->frame_type,
1548                 .subsampling_x  = seq->color_config.subsampling_x,
1549                 .subsampling_y  = seq->color_config.subsampling_y,
1550                 .bit_depth      = priv->bit_depth,
1551                 .order_hint     = current->order_hint,
1552             };
1553         }
1554     }
1555
1556     av_log(ctx->log_ctx, AV_LOG_DEBUG, "Frame %d:  size %dx%d  "
1557            "upscaled %d  render %dx%d  subsample %dx%d  "
1558            "bitdepth %d  tiles %dx%d.\n", current->order_hint,
1559            priv->frame_width, priv->frame_height, priv->upscaled_width,
1560            priv->render_width, priv->render_height,
1561            seq->color_config.subsampling_x + 1,
1562            seq->color_config.subsampling_y + 1, priv->bit_depth,
1563            priv->tile_rows, priv->tile_cols);
1564
1565     return 0;
1566 }
1567
1568 static int FUNC(frame_header_obu)(CodedBitstreamContext *ctx, RWContext *rw,
1569                                   AV1RawFrameHeader *current, int redundant,
1570                                   AVBufferRef *rw_buffer_ref)
1571 {
1572     CodedBitstreamAV1Context *priv = ctx->priv_data;
1573     int start_pos, fh_bits, fh_bytes, err;
1574     uint8_t *fh_start;
1575
1576     if (priv->seen_frame_header) {
1577         if (!redundant) {
1578             av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid repeated "
1579                    "frame header OBU.\n");
1580             return AVERROR_INVALIDDATA;
1581         } else {
1582             GetBitContext fh;
1583             size_t i, b;
1584             uint32_t val;
1585
1586             HEADER("Redundant Frame Header");
1587
1588             av_assert0(priv->frame_header_ref && priv->frame_header);
1589
1590             init_get_bits(&fh, priv->frame_header,
1591                           priv->frame_header_size);
1592             for (i = 0; i < priv->frame_header_size; i += 8) {
1593                 b = FFMIN(priv->frame_header_size - i, 8);
1594                 val = get_bits(&fh, b);
1595                 xf(b, frame_header_copy[i],
1596                    val, val, val, 1, i / 8);
1597             }
1598         }
1599     } else {
1600         if (redundant)
1601             HEADER("Redundant Frame Header (used as Frame Header)");
1602         else
1603             HEADER("Frame Header");
1604
1605         priv->seen_frame_header = 1;
1606
1607 #ifdef READ
1608         start_pos = get_bits_count(rw);
1609 #else
1610         start_pos = put_bits_count(rw);
1611 #endif
1612
1613         CHECK(FUNC(uncompressed_header)(ctx, rw, current));
1614
1615         if (current->show_existing_frame) {
1616             priv->seen_frame_header = 0;
1617         } else {
1618             priv->seen_frame_header = 1;
1619
1620             av_buffer_unref(&priv->frame_header_ref);
1621
1622 #ifdef READ
1623             fh_bits  = get_bits_count(rw) - start_pos;
1624             fh_start = (uint8_t*)rw->buffer + start_pos / 8;
1625 #else
1626             // Need to flush the bitwriter so that we can copy its output,
1627             // but use a copy so we don't affect the caller's structure.
1628             {
1629                 PutBitContext tmp = *rw;
1630                 flush_put_bits(&tmp);
1631             }
1632
1633             fh_bits  = put_bits_count(rw) - start_pos;
1634             fh_start = rw->buf + start_pos / 8;
1635 #endif
1636             fh_bytes = (fh_bits + 7) / 8;
1637
1638             priv->frame_header_size = fh_bits;
1639
1640             if (rw_buffer_ref) {
1641                 priv->frame_header_ref = av_buffer_ref(rw_buffer_ref);
1642                 if (!priv->frame_header_ref)
1643                     return AVERROR(ENOMEM);
1644                 priv->frame_header = fh_start;
1645             } else {
1646                 priv->frame_header_ref =
1647                     av_buffer_alloc(fh_bytes + AV_INPUT_BUFFER_PADDING_SIZE);
1648                 if (!priv->frame_header_ref)
1649                     return AVERROR(ENOMEM);
1650                 priv->frame_header = priv->frame_header_ref->data;
1651                 memcpy(priv->frame_header, fh_start, fh_bytes);
1652             }
1653         }
1654     }
1655
1656     return 0;
1657 }
1658
1659 static int FUNC(tile_group_obu)(CodedBitstreamContext *ctx, RWContext *rw,
1660                                 AV1RawTileGroup *current)
1661 {
1662     CodedBitstreamAV1Context *priv = ctx->priv_data;
1663     int num_tiles, tile_bits;
1664     int err;
1665
1666     HEADER("Tile Group");
1667
1668     num_tiles = priv->tile_cols * priv->tile_rows;
1669     if (num_tiles > 1)
1670         flag(tile_start_and_end_present_flag);
1671     else
1672         infer(tile_start_and_end_present_flag, 0);
1673
1674     if (num_tiles == 1 || !current->tile_start_and_end_present_flag) {
1675         infer(tg_start, 0);
1676         infer(tg_end, num_tiles - 1);
1677     } else {
1678         tile_bits = cbs_av1_tile_log2(1, priv->tile_cols) +
1679                     cbs_av1_tile_log2(1, priv->tile_rows);
1680         fb(tile_bits, tg_start);
1681         fb(tile_bits, tg_end);
1682     }
1683
1684     CHECK(FUNC(byte_alignment)(ctx, rw));
1685
1686     // Reset header for next frame.
1687     if (current->tg_end == num_tiles - 1)
1688         priv->seen_frame_header = 0;
1689
1690     // Tile data follows.
1691
1692     return 0;
1693 }
1694
1695 static int FUNC(frame_obu)(CodedBitstreamContext *ctx, RWContext *rw,
1696                            AV1RawFrame *current,
1697                            AVBufferRef *rw_buffer_ref)
1698 {
1699     int err;
1700
1701     CHECK(FUNC(frame_header_obu)(ctx, rw, &current->header,
1702                                  0, rw_buffer_ref));
1703
1704     CHECK(FUNC(byte_alignment)(ctx, rw));
1705
1706     CHECK(FUNC(tile_group_obu)(ctx, rw, &current->tile_group));
1707
1708     return 0;
1709 }
1710
1711 static int FUNC(tile_list_obu)(CodedBitstreamContext *ctx, RWContext *rw,
1712                                AV1RawTileList *current)
1713 {
1714     int err;
1715
1716     fb(8, output_frame_width_in_tiles_minus_1);
1717     fb(8, output_frame_height_in_tiles_minus_1);
1718
1719     fb(16, tile_count_minus_1);
1720
1721     // Tile data follows.
1722
1723     return 0;
1724 }
1725
1726 static int FUNC(metadata_hdr_cll)(CodedBitstreamContext *ctx, RWContext *rw,
1727                                   AV1RawMetadataHDRCLL *current)
1728 {
1729     int err;
1730
1731     fb(16, max_cll);
1732     fb(16, max_fall);
1733
1734     return 0;
1735 }
1736
1737 static int FUNC(metadata_hdr_mdcv)(CodedBitstreamContext *ctx, RWContext *rw,
1738                                    AV1RawMetadataHDRMDCV *current)
1739 {
1740     int err, i;
1741
1742     for (i = 0; i < 3; i++) {
1743         fbs(16, primary_chromaticity_x[i], 1, i);
1744         fbs(16, primary_chromaticity_y[i], 1, i);
1745     }
1746
1747     fb(16, white_point_chromaticity_x);
1748     fb(16, white_point_chromaticity_y);
1749
1750     fc(32, luminance_max, 1, MAX_UINT_BITS(32));
1751     // luminance_min must be lower than luminance_max. Convert luminance_max from
1752     // 24.8 fixed point to 18.14 fixed point in order to compare them.
1753     fc(32, luminance_min, 0, FFMIN(((uint64_t)current->luminance_max << 6) - 1,
1754                                    MAX_UINT_BITS(32)));
1755
1756     return 0;
1757 }
1758
1759 static int FUNC(scalability_structure)(CodedBitstreamContext *ctx, RWContext *rw,
1760                                        AV1RawMetadataScalability *current)
1761 {
1762     CodedBitstreamAV1Context *priv = ctx->priv_data;
1763     const AV1RawSequenceHeader *seq;
1764     int err, i, j;
1765
1766     if (!priv->sequence_header) {
1767         av_log(ctx->log_ctx, AV_LOG_ERROR, "No sequence header available: "
1768                "unable to parse scalability metadata.\n");
1769         return AVERROR_INVALIDDATA;
1770     }
1771     seq = priv->sequence_header;
1772
1773     fb(2, spatial_layers_cnt_minus_1);
1774     flag(spatial_layer_dimensions_present_flag);
1775     flag(spatial_layer_description_present_flag);
1776     flag(temporal_group_description_present_flag);
1777     fc(3, scalability_structure_reserved_3bits, 0, 0);
1778     if (current->spatial_layer_dimensions_present_flag) {
1779         for (i = 0; i <= current->spatial_layers_cnt_minus_1; i++) {
1780             fcs(16, spatial_layer_max_width[i],
1781                 0, seq->max_frame_width_minus_1 + 1, 1, i);
1782             fcs(16, spatial_layer_max_height[i],
1783                 0, seq->max_frame_height_minus_1 + 1, 1, i);
1784         }
1785     }
1786     if (current->spatial_layer_description_present_flag) {
1787         for (i = 0; i <= current->spatial_layers_cnt_minus_1; i++)
1788             fbs(8, spatial_layer_ref_id[i], 1, i);
1789     }
1790     if (current->temporal_group_description_present_flag) {
1791         fb(8, temporal_group_size);
1792         for (i = 0; i < current->temporal_group_size; i++) {
1793             fbs(3, temporal_group_temporal_id[i], 1, i);
1794             flags(temporal_group_temporal_switching_up_point_flag[i], 1, i);
1795             flags(temporal_group_spatial_switching_up_point_flag[i], 1, i);
1796             fbs(3, temporal_group_ref_cnt[i], 1, i);
1797             for (j = 0; j < current->temporal_group_ref_cnt[i]; j++) {
1798                 fbs(8, temporal_group_ref_pic_diff[i][j], 2, i, j);
1799             }
1800         }
1801     }
1802
1803     return 0;
1804 }
1805
1806 static int FUNC(metadata_scalability)(CodedBitstreamContext *ctx, RWContext *rw,
1807                                       AV1RawMetadataScalability *current)
1808 {
1809     int err;
1810
1811     fb(8, scalability_mode_idc);
1812
1813     if (current->scalability_mode_idc == AV1_SCALABILITY_SS)
1814         CHECK(FUNC(scalability_structure)(ctx, rw, current));
1815
1816     return 0;
1817 }
1818
1819 static int FUNC(metadata_itut_t35)(CodedBitstreamContext *ctx, RWContext *rw,
1820                                    AV1RawMetadataITUTT35 *current)
1821 {
1822     int err;
1823     size_t i;
1824
1825     fb(8, itu_t_t35_country_code);
1826     if (current->itu_t_t35_country_code == 0xff)
1827         fb(8, itu_t_t35_country_code_extension_byte);
1828
1829 #ifdef READ
1830     // The payload runs up to the start of the trailing bits, but there might
1831     // be arbitrarily many trailing zeroes so we need to read through twice.
1832     current->payload_size = cbs_av1_get_payload_bytes_left(rw);
1833
1834     current->payload_ref = av_buffer_alloc(current->payload_size);
1835     if (!current->payload_ref)
1836         return AVERROR(ENOMEM);
1837     current->payload = current->payload_ref->data;
1838 #endif
1839
1840     for (i = 0; i < current->payload_size; i++)
1841         xf(8, itu_t_t35_payload_bytes[i], current->payload[i],
1842            0x00, 0xff, 1, i);
1843
1844     return 0;
1845 }
1846
1847 static int FUNC(metadata_timecode)(CodedBitstreamContext *ctx, RWContext *rw,
1848                                    AV1RawMetadataTimecode *current)
1849 {
1850     int err;
1851
1852     fb(5, counting_type);
1853     flag(full_timestamp_flag);
1854     flag(discontinuity_flag);
1855     flag(cnt_dropped_flag);
1856     fb(9, n_frames);
1857
1858     if (current->full_timestamp_flag) {
1859         fc(6, seconds_value, 0, 59);
1860         fc(6, minutes_value, 0, 59);
1861         fc(5, hours_value,   0, 23);
1862     } else {
1863         flag(seconds_flag);
1864         if (current->seconds_flag) {
1865             fc(6, seconds_value, 0, 59);
1866             flag(minutes_flag);
1867             if (current->minutes_flag) {
1868                 fc(6, minutes_value, 0, 59);
1869                 flag(hours_flag);
1870                 if (current->hours_flag)
1871                     fc(5, hours_value, 0, 23);
1872             }
1873         }
1874     }
1875
1876     fb(5, time_offset_length);
1877     if (current->time_offset_length > 0)
1878         fb(current->time_offset_length, time_offset_value);
1879     else
1880         infer(time_offset_length, 0);
1881
1882     return 0;
1883 }
1884
1885 static int FUNC(metadata_obu)(CodedBitstreamContext *ctx, RWContext *rw,
1886                               AV1RawMetadata *current)
1887 {
1888     int err;
1889
1890     leb128(metadata_type);
1891
1892     switch (current->metadata_type) {
1893     case AV1_METADATA_TYPE_HDR_CLL:
1894         CHECK(FUNC(metadata_hdr_cll)(ctx, rw, &current->metadata.hdr_cll));
1895         break;
1896     case AV1_METADATA_TYPE_HDR_MDCV:
1897         CHECK(FUNC(metadata_hdr_mdcv)(ctx, rw, &current->metadata.hdr_mdcv));
1898         break;
1899     case AV1_METADATA_TYPE_SCALABILITY:
1900         CHECK(FUNC(metadata_scalability)(ctx, rw, &current->metadata.scalability));
1901         break;
1902     case AV1_METADATA_TYPE_ITUT_T35:
1903         CHECK(FUNC(metadata_itut_t35)(ctx, rw, &current->metadata.itut_t35));
1904         break;
1905     case AV1_METADATA_TYPE_TIMECODE:
1906         CHECK(FUNC(metadata_timecode)(ctx, rw, &current->metadata.timecode));
1907         break;
1908     default:
1909         // Unknown metadata type.
1910         return AVERROR_PATCHWELCOME;
1911     }
1912
1913     return 0;
1914 }
1915
1916 static int FUNC(padding_obu)(CodedBitstreamContext *ctx, RWContext *rw,
1917                              AV1RawPadding *current)
1918 {
1919     int i, err;
1920
1921     HEADER("Padding");
1922
1923 #ifdef READ
1924     // The payload runs up to the start of the trailing bits, but there might
1925     // be arbitrarily many trailing zeroes so we need to read through twice.
1926     current->payload_size = cbs_av1_get_payload_bytes_left(rw);
1927
1928     current->payload_ref = av_buffer_alloc(current->payload_size);
1929     if (!current->payload_ref)
1930         return AVERROR(ENOMEM);
1931     current->payload = current->payload_ref->data;
1932 #endif
1933
1934     for (i = 0; i < current->payload_size; i++)
1935         xf(8, obu_padding_byte[i], current->payload[i], 0x00, 0xff, 1, i);
1936
1937     return 0;
1938 }