git.sesse.net Git - ffmpeg/blob - libavcodec/cbs_av1_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(obu_header)(CodedBitstreamContext *ctx, RWContext *rw,
  20                             AV1RawOBUHeader *current)
  21 {
  22     int err;
  23
  24     HEADER("OBU header");
  25
  26     fc(1, obu_forbidden_bit, 0, 0);
  27
  28     fc(4, obu_type, 0, AV1_OBU_PADDING);
  29     flag(obu_extension_flag);
  30     flag(obu_has_size_field);
  31
  32     fc(1, obu_reserved_1bit, 0, 0);
  33
  34     if (current->obu_extension_flag) {
  35         fb(3, temporal_id);
  36         fb(2, spatial_id);
  37         fc(3, extension_header_reserved_3bits, 0, 0);
  38     }
  39
  40     return 0;
  41 }
  42
  43 static int FUNC(trailing_bits)(CodedBitstreamContext *ctx, RWContext *rw, int nb_bits)
  44 {
  45     int err;
  46
  47     av_assert0(nb_bits > 0);
  48
  49     fixed(1, trailing_one_bit, 1);
  50     --nb_bits;
  51
  52     while (nb_bits > 0) {
  53         fixed(1, trailing_zero_bit, 0);
  54         --nb_bits;
  55     }
  56
  57     return 0;
  58 }
  59
  60 static int FUNC(byte_alignment)(CodedBitstreamContext *ctx, RWContext *rw)
  61 {
  62     int err;
  63
  64     while (byte_alignment(rw) != 0)
  65         fixed(1, zero_bit, 0);
  66
  67     return 0;
  68 }
  69
  70 static int FUNC(color_config)(CodedBitstreamContext *ctx, RWContext *rw,
  71                               AV1RawColorConfig *current, int seq_profile)
  72 {
  73     CodedBitstreamAV1Context *priv = ctx->priv_data;
  74     int err;
  75
  76     flag(high_bitdepth);
  77
  78     if (seq_profile == FF_PROFILE_AV1_PROFESSIONAL &&
  79         current->high_bitdepth) {
  80         flag(twelve_bit);
  81         priv->bit_depth = current->twelve_bit ? 12 : 10;
  82     } else {
  83         priv->bit_depth = current->high_bitdepth ? 10 : 8;
  84     }
  85
  86     if (seq_profile == FF_PROFILE_AV1_HIGH)
  87         infer(mono_chrome, 0);
  88     else
  89         flag(mono_chrome);
  90     priv->num_planes = current->mono_chrome ? 1 : 3;
  91
  92     flag(color_description_present_flag);
  93     if (current->color_description_present_flag) {
  94         fb(8, color_primaries);
  95         fb(8, transfer_characteristics);
  96         fb(8, matrix_coefficients);
  97     } else {
  98         infer(color_primaries,          AVCOL_PRI_UNSPECIFIED);
  99         infer(transfer_characteristics, AVCOL_TRC_UNSPECIFIED);
 100         infer(matrix_coefficients,      AVCOL_SPC_UNSPECIFIED);
 101     }
 102
 103     if (current->mono_chrome) {
 104         flag(color_range);
 105
 106         infer(subsampling_x, 1);
 107         infer(subsampling_y, 1);
 108         infer(chroma_sample_position, AV1_CSP_UNKNOWN);
 109         infer(separate_uv_delta_q, 0);
 110
 111     } else if (current->color_primaries          == AVCOL_PRI_BT709 &&
 112                current->transfer_characteristics == AVCOL_TRC_IEC61966_2_1 &&
 113                current->matrix_coefficients      == AVCOL_SPC_RGB) {
 114         infer(color_range,   1);
 115         infer(subsampling_x, 0);
 116         infer(subsampling_y, 0);
 117         flag(separate_uv_delta_q);
 118
 119     } else {
 120         flag(color_range);
 121
 122         if (seq_profile == FF_PROFILE_AV1_MAIN) {
 123             infer(subsampling_x, 1);
 124             infer(subsampling_y, 1);
 125         } else if (seq_profile == FF_PROFILE_AV1_HIGH) {
 126             infer(subsampling_x, 0);
 127             infer(subsampling_y, 0);
 128         } else {
 129             if (priv->bit_depth == 12) {
 130                 fb(1, subsampling_x);
 131                 if (current->subsampling_x)
 132                     fb(1, subsampling_y);
 133                 else
 134                     infer(subsampling_y, 0);
 135             } else {
 136                 infer(subsampling_x, 1);
 137                 infer(subsampling_y, 0);
 138             }
 139         }
 140         if (current->subsampling_x && current->subsampling_y) {
 141             fc(2, chroma_sample_position, AV1_CSP_UNKNOWN,
 142                                           AV1_CSP_COLOCATED);
 143         }
 144
 145         flag(separate_uv_delta_q);
 146     }
 147
 148     return 0;
 149 }
 150
 151 static int FUNC(timing_info)(CodedBitstreamContext *ctx, RWContext *rw,
 152                              AV1RawTimingInfo *current)
 153 {
 154     int err;
 155
 156     fc(32, num_units_in_display_tick, 1, MAX_UINT_BITS(32));
 157     fc(32, time_scale,                1, MAX_UINT_BITS(32));
 158
 159     flag(equal_picture_interval);
 160     if (current->equal_picture_interval)
 161         uvlc(num_ticks_per_picture_minus_1, 0, MAX_UINT_BITS(32) - 1);
 162
 163     return 0;
 164 }
 165
 166 static int FUNC(decoder_model_info)(CodedBitstreamContext *ctx, RWContext *rw,
 167                                     AV1RawDecoderModelInfo *current)
 168 {
 169     int err;
 170
 171     fb(5, buffer_delay_length_minus_1);
 172     fb(32, num_units_in_decoding_tick);
 173     fb(5,  buffer_removal_time_length_minus_1);
 174     fb(5,  frame_presentation_time_length_minus_1);
 175
 176     return 0;
 177 }
 178
 179 static int FUNC(sequence_header_obu)(CodedBitstreamContext *ctx, RWContext *rw,
 180                                      AV1RawSequenceHeader *current)
 181 {
 182     int i, err;
 183
 184     HEADER("Sequence Header");
 185
 186     fc(3, seq_profile, FF_PROFILE_AV1_MAIN,
 187                        FF_PROFILE_AV1_PROFESSIONAL);
 188     flag(still_picture);
 189     flag(reduced_still_picture_header);
 190
 191     if (current->reduced_still_picture_header) {
 192         infer(timing_info_present_flag,           0);
 193         infer(decoder_model_info_present_flag,    0);
 194         infer(initial_display_delay_present_flag, 0);
 195         infer(operating_points_cnt_minus_1,       0);
 196         infer(operating_point_idc[0],             0);
 197
 198         fb(5, seq_level_idx[0]);
 199
 200         infer(seq_tier[0], 0);
 201         infer(decoder_model_present_for_this_op[0],         0);
 202         infer(initial_display_delay_present_for_this_op[0], 0);
 203
 204     } else {
 205         flag(timing_info_present_flag);
 206         if (current->timing_info_present_flag) {
 207             CHECK(FUNC(timing_info)(ctx, rw, &current->timing_info));
 208
 209             flag(decoder_model_info_present_flag);
 210             if (current->decoder_model_info_present_flag) {
 211                 CHECK(FUNC(decoder_model_info)
 212                           (ctx, rw, &current->decoder_model_info));
 213             }
 214         } else {
 215             infer(decoder_model_info_present_flag, 0);
 216         }
 217
 218         flag(initial_display_delay_present_flag);
 219
 220         fb(5, operating_points_cnt_minus_1);
 221         for (i = 0; i <= current->operating_points_cnt_minus_1; i++) {
 222             fbs(12, operating_point_idc[i], 1, i);
 223             fbs(5,  seq_level_idx[i], 1, i);
 224
 225             if (current->seq_level_idx[i] > 7)
 226                 flags(seq_tier[i], 1, i);
 227             else
 228                 infer(seq_tier[i], 0);
 229
 230             if (current->decoder_model_info_present_flag) {
 231                 flags(decoder_model_present_for_this_op[i], 1, i);
 232                 if (current->decoder_model_present_for_this_op[i]) {
 233                     int n = current->decoder_model_info.buffer_delay_length_minus_1 + 1;
 234                     fbs(n, decoder_buffer_delay[i], 1, i);
 235                     fbs(n, encoder_buffer_delay[i], 1, i);
 236                     flags(low_delay_mode_flag[i], 1, i);
 237                 }
 238             } else {
 239                 infer(decoder_model_present_for_this_op[i], 0);
 240             }
 241
 242             if (current->initial_display_delay_present_flag) {
 243                 flags(initial_display_delay_present_for_this_op[i], 1, i);
 244                 if (current->initial_display_delay_present_for_this_op[i])
 245                     fbs(4, initial_display_delay_minus_1[i], 1, i);
 246             }
 247         }
 248     }
 249
 250     fb(4, frame_width_bits_minus_1);
 251     fb(4, frame_height_bits_minus_1);
 252
 253     fb(current->frame_width_bits_minus_1  + 1, max_frame_width_minus_1);
 254     fb(current->frame_height_bits_minus_1 + 1, max_frame_height_minus_1);
 255
 256     if (current->reduced_still_picture_header)
 257         infer(frame_id_numbers_present_flag, 0);
 258     else
 259         flag(frame_id_numbers_present_flag);
 260     if (current->frame_id_numbers_present_flag) {
 261         fb(4, delta_frame_id_length_minus_2);
 262         fb(3, additional_frame_id_length_minus_1);
 263     }
 264
 265     flag(use_128x128_superblock);
 266     flag(enable_filter_intra);
 267     flag(enable_intra_edge_filter);
 268
 269     if (current->reduced_still_picture_header) {
 270         infer(enable_interintra_compound, 0);
 271         infer(enable_masked_compound,     0);
 272         infer(enable_warped_motion,       0);
 273         infer(enable_dual_filter,         0);
 274         infer(enable_order_hint,          0);
 275         infer(enable_jnt_comp,            0);
 276         infer(enable_ref_frame_mvs,       0);
 277
 278         infer(seq_force_screen_content_tools,
 279               AV1_SELECT_SCREEN_CONTENT_TOOLS);
 280         infer(seq_force_integer_mv,
 281               AV1_SELECT_INTEGER_MV);
 282     } else {
 283         flag(enable_interintra_compound);
 284         flag(enable_masked_compound);
 285         flag(enable_warped_motion);
 286         flag(enable_dual_filter);
 287
 288         flag(enable_order_hint);
 289         if (current->enable_order_hint) {
 290             flag(enable_jnt_comp);
 291             flag(enable_ref_frame_mvs);
 292         } else {
 293             infer(enable_jnt_comp,      0);
 294             infer(enable_ref_frame_mvs, 0);
 295         }
 296
 297         flag(seq_choose_screen_content_tools);
 298         if (current->seq_choose_screen_content_tools)
 299             infer(seq_force_screen_content_tools,
 300                   AV1_SELECT_SCREEN_CONTENT_TOOLS);
 301         else
 302             fb(1, seq_force_screen_content_tools);
 303         if (current->seq_force_screen_content_tools > 0) {
 304             flag(seq_choose_integer_mv);
 305             if (current->seq_choose_integer_mv)
 306                 infer(seq_force_integer_mv,
 307                       AV1_SELECT_INTEGER_MV);
 308             else
 309                 fb(1, seq_force_integer_mv);
 310         } else {
 311             infer(seq_force_integer_mv, AV1_SELECT_INTEGER_MV);
 312         }
 313
 314         if (current->enable_order_hint)
 315             fb(3, order_hint_bits_minus_1);
 316     }
 317
 318     flag(enable_superres);
 319     flag(enable_cdef);
 320     flag(enable_restoration);
 321
 322     CHECK(FUNC(color_config)(ctx, rw, &current->color_config,
 323                              current->seq_profile));
 324
 325     flag(film_grain_params_present);
 326
 327     return 0;
 328 }
 329
 330 static int FUNC(temporal_delimiter_obu)(CodedBitstreamContext *ctx, RWContext *rw)
 331 {
 332     CodedBitstreamAV1Context *priv = ctx->priv_data;
 333
 334     HEADER("Temporal Delimiter");
 335
 336     priv->seen_frame_header = 0;
 337
 338     return 0;
 339 }
 340
 341 static int FUNC(set_frame_refs)(CodedBitstreamContext *ctx, RWContext *rw,
 342                                 AV1RawFrameHeader *current)
 343 {
 344     CodedBitstreamAV1Context *priv = ctx->priv_data;
 345     const AV1RawSequenceHeader *seq = priv->sequence_header;
 346     static const uint8_t ref_frame_list[AV1_NUM_REF_FRAMES - 2] = {
 347         AV1_REF_FRAME_LAST2, AV1_REF_FRAME_LAST3, AV1_REF_FRAME_BWDREF,
 348         AV1_REF_FRAME_ALTREF2, AV1_REF_FRAME_ALTREF
 349     };
 350     int8_t ref_frame_idx[AV1_REFS_PER_FRAME], used_frame[AV1_NUM_REF_FRAMES];
 351     int8_t shifted_order_hints[AV1_NUM_REF_FRAMES];
 352     int cur_frame_hint, latest_order_hint, earliest_order_hint, ref;
 353     int i, j;
 354
 355     for (i = 0; i < AV1_REFS_PER_FRAME; i++)
 356         ref_frame_idx[i] = -1;
 357     ref_frame_idx[AV1_REF_FRAME_LAST - AV1_REF_FRAME_LAST] = current->last_frame_idx;
 358     ref_frame_idx[AV1_REF_FRAME_GOLDEN - AV1_REF_FRAME_LAST] = current->golden_frame_idx;
 359
 360     for (i = 0; i < AV1_NUM_REF_FRAMES; i++)
 361         used_frame[i] = 0;
 362     used_frame[current->last_frame_idx] = 1;
 363     used_frame[current->golden_frame_idx] = 1;
 364
 365     cur_frame_hint = 1 << (seq->order_hint_bits_minus_1);
 366     for (i = 0; i < AV1_NUM_REF_FRAMES; i++)
 367         shifted_order_hints[i] = cur_frame_hint +
 368                                  cbs_av1_get_relative_dist(seq, priv->ref[i].order_hint,
 369                                                            current->order_hint);
 370
 371     latest_order_hint = shifted_order_hints[current->last_frame_idx];
 372     earliest_order_hint = shifted_order_hints[current->golden_frame_idx];
 373
 374     ref = -1;
 375     for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
 376         int hint = shifted_order_hints[i];
 377         if (!used_frame[i] && hint >= cur_frame_hint &&
 378             (ref < 0 || hint >= latest_order_hint)) {
 379             ref = i;
 380             latest_order_hint = hint;
 381         }
 382     }
 383     if (ref >= 0) {
 384         ref_frame_idx[AV1_REF_FRAME_ALTREF - AV1_REF_FRAME_LAST] = ref;
 385         used_frame[ref] = 1;
 386     }
 387
 388     ref = -1;
 389     for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
 390         int hint = shifted_order_hints[i];
 391         if (!used_frame[i] && hint >= cur_frame_hint &&
 392             (ref < 0 || hint < earliest_order_hint)) {
 393             ref = i;
 394             earliest_order_hint = hint;
 395         }
 396     }
 397     if (ref >= 0) {
 398         ref_frame_idx[AV1_REF_FRAME_BWDREF - AV1_REF_FRAME_LAST] = ref;
 399         used_frame[ref] = 1;
 400     }
 401
 402     ref = -1;
 403     for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
 404         int hint = shifted_order_hints[i];
 405         if (!used_frame[i] && hint >= cur_frame_hint &&
 406             (ref < 0 || hint < earliest_order_hint)) {
 407             ref = i;
 408             earliest_order_hint = hint;
 409         }
 410     }
 411     if (ref >= 0) {
 412         ref_frame_idx[AV1_REF_FRAME_ALTREF2 - AV1_REF_FRAME_LAST] = ref;
 413         used_frame[ref] = 1;
 414     }
 415
 416     for (i = 0; i < AV1_REFS_PER_FRAME - 2; i++) {
 417         int ref_frame = ref_frame_list[i];
 418         if (ref_frame_idx[ref_frame - AV1_REF_FRAME_LAST] < 0 ) {
 419             ref = -1;
 420             for (j = 0; j < AV1_NUM_REF_FRAMES; j++) {
 421                 int hint = shifted_order_hints[j];
 422                 if (!used_frame[j] && hint < cur_frame_hint &&
 423                     (ref < 0 || hint >= latest_order_hint)) {
 424                     ref = j;
 425                     latest_order_hint = hint;
 426                 }
 427             }
 428             if (ref >= 0) {
 429                 ref_frame_idx[ref_frame - AV1_REF_FRAME_LAST] = ref;
 430                 used_frame[ref] = 1;
 431             }
 432         }
 433     }
 434
 435     ref = -1;
 436     for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
 437         int hint = shifted_order_hints[i];
 438         if (ref < 0 || hint < earliest_order_hint) {
 439             ref = i;
 440             earliest_order_hint = hint;
 441         }
 442     }
 443     for (i = 0; i < AV1_REFS_PER_FRAME; i++) {
 444         if (ref_frame_idx[i] < 0)
 445             ref_frame_idx[i] = ref;
 446         infer(ref_frame_idx[i], ref_frame_idx[i]);
 447     }
 448
 449     return 0;
 450 }
 451
 452 static int FUNC(superres_params)(CodedBitstreamContext *ctx, RWContext *rw,
 453                                  AV1RawFrameHeader *current)
 454 {
 455     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 456     const AV1RawSequenceHeader *seq = priv->sequence_header;
 457     int denom, err;
 458
 459     if (seq->enable_superres)
 460         flag(use_superres);
 461     else
 462         infer(use_superres, 0);
 463
 464     if (current->use_superres) {
 465         fb(3, coded_denom);
 466         denom = current->coded_denom + AV1_SUPERRES_DENOM_MIN;
 467     } else {
 468         denom = AV1_SUPERRES_NUM;
 469     }
 470
 471     priv->upscaled_width = priv->frame_width;
 472     priv->frame_width = (priv->upscaled_width * AV1_SUPERRES_NUM +
 473                          denom / 2) / denom;
 474
 475     return 0;
 476 }
 477
 478 static int FUNC(frame_size)(CodedBitstreamContext *ctx, RWContext *rw,
 479                             AV1RawFrameHeader *current)
 480 {
 481     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 482     const AV1RawSequenceHeader *seq = priv->sequence_header;
 483     int err;
 484
 485     if (current->frame_size_override_flag) {
 486         fb(seq->frame_width_bits_minus_1 + 1,  frame_width_minus_1);
 487         fb(seq->frame_height_bits_minus_1 + 1, frame_height_minus_1);
 488
 489         priv->frame_width  = current->frame_width_minus_1  + 1;
 490         priv->frame_height = current->frame_height_minus_1 + 1;
 491     } else {
 492         priv->frame_width  = seq->max_frame_width_minus_1  + 1;
 493         priv->frame_height = seq->max_frame_height_minus_1 + 1;
 494     }
 495
 496     CHECK(FUNC(superres_params)(ctx, rw, current));
 497
 498     return 0;
 499 }
 500
 501 static int FUNC(render_size)(CodedBitstreamContext *ctx, RWContext *rw,
 502                              AV1RawFrameHeader *current)
 503 {
 504     CodedBitstreamAV1Context *priv = ctx->priv_data;
 505     int err;
 506
 507     flag(render_and_frame_size_different);
 508
 509     if (current->render_and_frame_size_different) {
 510         fb(16, render_width_minus_1);
 511         fb(16, render_height_minus_1);
 512
 513         priv->render_width  = current->render_width_minus_1  + 1;
 514         priv->render_height = current->render_height_minus_1 + 1;
 515     } else {
 516         priv->render_width  = priv->upscaled_width;
 517         priv->render_height = priv->frame_height;
 518     }
 519
 520     return 0;
 521 }
 522
 523 static int FUNC(frame_size_with_refs)(CodedBitstreamContext *ctx, RWContext *rw,
 524                                       AV1RawFrameHeader *current)
 525 {
 526     CodedBitstreamAV1Context *priv = ctx->priv_data;
 527     int i, err;
 528
 529     for (i = 0; i < AV1_REFS_PER_FRAME; i++) {
 530         flags(found_ref[i], 1, i);
 531         if (current->found_ref[i]) {
 532             AV1ReferenceFrameState *ref =
 533                 &priv->ref[current->ref_frame_idx[i]];
 534
 535             if (!ref->valid) {
 536                 av_log(ctx->log_ctx, AV_LOG_ERROR,
 537                        "Missing reference frame needed for frame size "
 538                        "(ref = %d, ref_frame_idx = %d).\n",
 539                        i, current->ref_frame_idx[i]);
 540                 return AVERROR_INVALIDDATA;
 541             }
 542
 543             priv->upscaled_width = ref->upscaled_width;
 544             priv->frame_width    = ref->frame_width;
 545             priv->frame_height   = ref->frame_height;
 546             priv->render_width   = ref->render_width;
 547             priv->render_height  = ref->render_height;
 548             break;
 549         }
 550     }
 551
 552     if (i >= AV1_REFS_PER_FRAME) {
 553         CHECK(FUNC(frame_size)(ctx, rw, current));
 554         CHECK(FUNC(render_size)(ctx, rw, current));
 555     } else {
 556         CHECK(FUNC(superres_params)(ctx, rw, current));
 557     }
 558
 559     return 0;
 560 }
 561
 562 static int FUNC(interpolation_filter)(CodedBitstreamContext *ctx, RWContext *rw,
 563                                       AV1RawFrameHeader *current)
 564 {
 565     int err;
 566
 567     flag(is_filter_switchable);
 568     if (current->is_filter_switchable)
 569         infer(interpolation_filter,
 570               AV1_INTERPOLATION_FILTER_SWITCHABLE);
 571     else
 572         fb(2, interpolation_filter);
 573
 574     return 0;
 575 }
 576
 577 static int FUNC(tile_info)(CodedBitstreamContext *ctx, RWContext *rw,
 578                            AV1RawFrameHeader *current)
 579 {
 580     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 581     const AV1RawSequenceHeader *seq = priv->sequence_header;
 582     int mi_cols, mi_rows, sb_cols, sb_rows, sb_shift, sb_size;
 583     int max_tile_width_sb, max_tile_height_sb, max_tile_area_sb;
 584     int min_log2_tile_cols, max_log2_tile_cols, max_log2_tile_rows;
 585     int min_log2_tiles, min_log2_tile_rows;
 586     int i, err;
 587
 588     mi_cols = 2 * ((priv->frame_width  + 7) >> 3);
 589     mi_rows = 2 * ((priv->frame_height + 7) >> 3);
 590
 591     sb_cols = seq->use_128x128_superblock ? ((mi_cols + 31) >> 5)
 592                                           : ((mi_cols + 15) >> 4);
 593     sb_rows = seq->use_128x128_superblock ? ((mi_rows + 31) >> 5)
 594                                           : ((mi_rows + 15) >> 4);
 595
 596     sb_shift = seq->use_128x128_superblock ? 5 : 4;
 597     sb_size  = sb_shift + 2;
 598
 599     max_tile_width_sb = AV1_MAX_TILE_WIDTH >> sb_size;
 600     max_tile_area_sb  = AV1_MAX_TILE_AREA  >> (2 * sb_size);
 601
 602     min_log2_tile_cols = cbs_av1_tile_log2(max_tile_width_sb, sb_cols);
 603     max_log2_tile_cols = cbs_av1_tile_log2(1, FFMIN(sb_cols, AV1_MAX_TILE_COLS));
 604     max_log2_tile_rows = cbs_av1_tile_log2(1, FFMIN(sb_rows, AV1_MAX_TILE_ROWS));
 605     min_log2_tiles = FFMAX(min_log2_tile_cols,
 606                            cbs_av1_tile_log2(max_tile_area_sb, sb_rows * sb_cols));
 607
 608     flag(uniform_tile_spacing_flag);
 609
 610     if (current->uniform_tile_spacing_flag) {
 611         int tile_width_sb, tile_height_sb;
 612
 613         increment(tile_cols_log2, min_log2_tile_cols, max_log2_tile_cols);
 614
 615         tile_width_sb = (sb_cols + (1 << current->tile_cols_log2) - 1) >>
 616             current->tile_cols_log2;
 617         current->tile_cols = (sb_cols + tile_width_sb - 1) / tile_width_sb;
 618
 619         min_log2_tile_rows = FFMAX(min_log2_tiles - current->tile_cols_log2, 0);
 620
 621         increment(tile_rows_log2, min_log2_tile_rows, max_log2_tile_rows);
 622
 623         tile_height_sb = (sb_rows + (1 << current->tile_rows_log2) - 1) >>
 624             current->tile_rows_log2;
 625         current->tile_rows = (sb_rows + tile_height_sb - 1) / tile_height_sb;
 626
 627     } else {
 628         int widest_tile_sb, start_sb, size_sb, max_width, max_height;
 629
 630         widest_tile_sb = 0;
 631
 632         start_sb = 0;
 633         for (i = 0; start_sb < sb_cols && i < AV1_MAX_TILE_COLS; i++) {
 634             max_width = FFMIN(sb_cols - start_sb, max_tile_width_sb);
 635             ns(max_width, width_in_sbs_minus_1[i], 1, i);
 636             size_sb = current->width_in_sbs_minus_1[i] + 1;
 637             widest_tile_sb = FFMAX(size_sb, widest_tile_sb);
 638             start_sb += size_sb;
 639         }
 640         current->tile_cols_log2 = cbs_av1_tile_log2(1, i);
 641         current->tile_cols = i;
 642
 643         if (min_log2_tiles > 0)
 644             max_tile_area_sb = (sb_rows * sb_cols) >> (min_log2_tiles + 1);
 645         else
 646             max_tile_area_sb = sb_rows * sb_cols;
 647         max_tile_height_sb = FFMAX(max_tile_area_sb / widest_tile_sb, 1);
 648
 649         start_sb = 0;
 650         for (i = 0; start_sb < sb_rows && i < AV1_MAX_TILE_ROWS; i++) {
 651             max_height = FFMIN(sb_rows - start_sb, max_tile_height_sb);
 652             ns(max_height, height_in_sbs_minus_1[i], 1, i);
 653             size_sb = current->height_in_sbs_minus_1[i] + 1;
 654             start_sb += size_sb;
 655         }
 656         current->tile_rows_log2 = cbs_av1_tile_log2(1, i);
 657         current->tile_rows = i;
 658     }
 659
 660     if (current->tile_cols_log2 > 0 ||
 661         current->tile_rows_log2 > 0) {
 662         fb(current->tile_cols_log2 + current->tile_rows_log2,
 663            context_update_tile_id);
 664         fb(2, tile_size_bytes_minus1);
 665     } else {
 666         infer(context_update_tile_id, 0);
 667     }
 668
 669     priv->tile_cols = current->tile_cols;
 670     priv->tile_rows = current->tile_rows;
 671
 672     return 0;
 673 }
 674
 675 static int FUNC(quantization_params)(CodedBitstreamContext *ctx, RWContext *rw,
 676                                      AV1RawFrameHeader *current)
 677 {
 678     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 679     const AV1RawSequenceHeader *seq = priv->sequence_header;
 680     int err;
 681
 682     fb(8, base_q_idx);
 683
 684     delta_q(delta_q_y_dc);
 685
 686     if (priv->num_planes > 1) {
 687         if (seq->color_config.separate_uv_delta_q)
 688             flag(diff_uv_delta);
 689         else
 690             infer(diff_uv_delta, 0);
 691
 692         delta_q(delta_q_u_dc);
 693         delta_q(delta_q_u_ac);
 694
 695         if (current->diff_uv_delta) {
 696             delta_q(delta_q_v_dc);
 697             delta_q(delta_q_v_ac);
 698         } else {
 699             infer(delta_q_v_dc, current->delta_q_u_dc);
 700             infer(delta_q_v_ac, current->delta_q_u_ac);
 701         }
 702     } else {
 703         infer(delta_q_u_dc, 0);
 704         infer(delta_q_u_ac, 0);
 705         infer(delta_q_v_dc, 0);
 706         infer(delta_q_v_ac, 0);
 707     }
 708
 709     flag(using_qmatrix);
 710     if (current->using_qmatrix) {
 711         fb(4, qm_y);
 712         fb(4, qm_u);
 713         if (seq->color_config.separate_uv_delta_q)
 714             fb(4, qm_v);
 715         else
 716             infer(qm_v, current->qm_u);
 717     }
 718
 719     return 0;
 720 }
 721
 722 static int FUNC(segmentation_params)(CodedBitstreamContext *ctx, RWContext *rw,
 723                                      AV1RawFrameHeader *current)
 724 {
 725     static const uint8_t bits[AV1_SEG_LVL_MAX] = { 8, 6, 6, 6, 6, 3, 0, 0 };
 726     static const uint8_t sign[AV1_SEG_LVL_MAX] = { 1, 1, 1, 1, 1, 0, 0, 0 };
 727     int i, j, err;
 728
 729     flag(segmentation_enabled);
 730
 731     if (current->segmentation_enabled) {
 732         if (current->primary_ref_frame == AV1_PRIMARY_REF_NONE) {
 733             infer(segmentation_update_map,      1);
 734             infer(segmentation_temporal_update, 0);
 735             infer(segmentation_update_data,     1);
 736         } else {
 737             flag(segmentation_update_map);
 738             if (current->segmentation_update_map)
 739                 flag(segmentation_temporal_update);
 740             else
 741                 infer(segmentation_temporal_update, 0);
 742             flag(segmentation_update_data);
 743         }
 744
 745         if (current->segmentation_update_data) {
 746             for (i = 0; i < AV1_MAX_SEGMENTS; i++) {
 747                 for (j = 0; j < AV1_SEG_LVL_MAX; j++) {
 748                     flags(feature_enabled[i][j], 2, i, j);
 749
 750                     if (current->feature_enabled[i][j] && bits[j] > 0) {
 751                         if (sign[j])
 752                             sus(1 + bits[j], feature_value[i][j], 2, i, j);
 753                         else
 754                             fbs(bits[j], feature_value[i][j], 2, i, j);
 755                     } else {
 756                         infer(feature_value[i][j], 0);
 757                     }
 758                 }
 759             }
 760         }
 761     } else {
 762         for (i = 0; i < AV1_MAX_SEGMENTS; i++) {
 763             for (j = 0; j < AV1_SEG_LVL_MAX; j++) {
 764                 infer(feature_enabled[i][j], 0);
 765                 infer(feature_value[i][j],   0);
 766             }
 767         }
 768     }
 769
 770     return 0;
 771 }
 772
 773 static int FUNC(delta_q_params)(CodedBitstreamContext *ctx, RWContext *rw,
 774                                 AV1RawFrameHeader *current)
 775 {
 776     int err;
 777
 778     if (current->base_q_idx > 0)
 779         flag(delta_q_present);
 780     else
 781         infer(delta_q_present, 0);
 782
 783     if (current->delta_q_present)
 784         fb(2, delta_q_res);
 785
 786     return 0;
 787 }
 788
 789 static int FUNC(delta_lf_params)(CodedBitstreamContext *ctx, RWContext *rw,
 790                                  AV1RawFrameHeader *current)
 791 {
 792     int err;
 793
 794     if (current->delta_q_present) {
 795         if (!current->allow_intrabc)
 796             flag(delta_lf_present);
 797         else
 798             infer(delta_lf_present, 0);
 799         if (current->delta_lf_present) {
 800             fb(2, delta_lf_res);
 801             flag(delta_lf_multi);
 802         } else {
 803             infer(delta_lf_res,   0);
 804             infer(delta_lf_multi, 0);
 805         }
 806     } else {
 807         infer(delta_lf_present, 0);
 808         infer(delta_lf_res,     0);
 809         infer(delta_lf_multi,   0);
 810     }
 811
 812     return 0;
 813 }
 814
 815 static int FUNC(loop_filter_params)(CodedBitstreamContext *ctx, RWContext *rw,
 816                                     AV1RawFrameHeader *current)
 817 {
 818     CodedBitstreamAV1Context *priv = ctx->priv_data;
 819     int i, err;
 820
 821     if (priv->coded_lossless || current->allow_intrabc) {
 822         infer(loop_filter_level[0], 0);
 823         infer(loop_filter_level[1], 0);
 824         infer(loop_filter_ref_deltas[AV1_REF_FRAME_INTRA],    1);
 825         infer(loop_filter_ref_deltas[AV1_REF_FRAME_LAST],     0);
 826         infer(loop_filter_ref_deltas[AV1_REF_FRAME_LAST2],    0);
 827         infer(loop_filter_ref_deltas[AV1_REF_FRAME_LAST3],    0);
 828         infer(loop_filter_ref_deltas[AV1_REF_FRAME_BWDREF],   0);
 829         infer(loop_filter_ref_deltas[AV1_REF_FRAME_GOLDEN],  -1);
 830         infer(loop_filter_ref_deltas[AV1_REF_FRAME_ALTREF],  -1);
 831         infer(loop_filter_ref_deltas[AV1_REF_FRAME_ALTREF2], -1);
 832         for (i = 0; i < 2; i++)
 833             infer(loop_filter_mode_deltas[i], 0);
 834         return 0;
 835     }
 836
 837     fb(6, loop_filter_level[0]);
 838     fb(6, loop_filter_level[1]);
 839
 840     if (priv->num_planes > 1) {
 841         if (current->loop_filter_level[0] ||
 842             current->loop_filter_level[1]) {
 843             fb(6, loop_filter_level[2]);
 844             fb(6, loop_filter_level[3]);
 845         }
 846     }
 847
 848     fb(3, loop_filter_sharpness);
 849
 850     flag(loop_filter_delta_enabled);
 851     if (current->loop_filter_delta_enabled) {
 852         flag(loop_filter_delta_update);
 853         if (current->loop_filter_delta_update) {
 854             for (i = 0; i < AV1_TOTAL_REFS_PER_FRAME; i++) {
 855                 flags(update_ref_delta[i], 1, i);
 856                 if (current->update_ref_delta[i])
 857                     sus(1 + 6, loop_filter_ref_deltas[i], 1, i);
 858             }
 859             for (i = 0; i < 2; i++) {
 860                 flags(update_mode_delta[i], 1, i);
 861                 if (current->update_mode_delta[i])
 862                     sus(1 + 6, loop_filter_mode_deltas[i], 1, i);
 863             }
 864         }
 865     }
 866
 867     return 0;
 868 }
 869
 870 static int FUNC(cdef_params)(CodedBitstreamContext *ctx, RWContext *rw,
 871                              AV1RawFrameHeader *current)
 872 {
 873     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 874     const AV1RawSequenceHeader *seq = priv->sequence_header;
 875     int i, err;
 876
 877     if (priv->coded_lossless || current->allow_intrabc ||
 878         !seq->enable_cdef) {
 879         infer(cdef_damping_minus_3, 0);
 880         infer(cdef_bits, 0);
 881         infer(cdef_y_pri_strength[0],  0);
 882         infer(cdef_y_sec_strength[0],  0);
 883         infer(cdef_uv_pri_strength[0], 0);
 884         infer(cdef_uv_sec_strength[0], 0);
 885
 886         return 0;
 887     }
 888
 889     fb(2, cdef_damping_minus_3);
 890     fb(2, cdef_bits);
 891
 892     for (i = 0; i < (1 << current->cdef_bits); i++) {
 893         fbs(4, cdef_y_pri_strength[i], 1, i);
 894         fbs(2, cdef_y_sec_strength[i], 1, i);
 895
 896         if (priv->num_planes > 1) {
 897             fbs(4, cdef_uv_pri_strength[i], 1, i);
 898             fbs(2, cdef_uv_sec_strength[i], 1, i);
 899         }
 900     }
 901
 902     return 0;
 903 }
 904
 905 static int FUNC(lr_params)(CodedBitstreamContext *ctx, RWContext *rw,
 906                            AV1RawFrameHeader *current)
 907 {
 908     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 909     const AV1RawSequenceHeader *seq = priv->sequence_header;
 910     int uses_lr,  uses_chroma_lr;
 911     int i, err;
 912
 913     if (priv->all_lossless || current->allow_intrabc ||
 914         !seq->enable_restoration) {
 915         return 0;
 916     }
 917
 918     uses_lr = uses_chroma_lr = 0;
 919     for (i = 0; i < priv->num_planes; i++) {
 920         fbs(2, lr_type[i], 1, i);
 921
 922         if (current->lr_type[i] != 0) {
 923             uses_lr = 1;
 924             if (i > 0)
 925                 uses_chroma_lr = 1;
 926         }
 927     }
 928
 929     if (uses_lr) {
 930         if (seq->use_128x128_superblock)
 931             increment(lr_unit_shift, 1, 2);
 932         else
 933             increment(lr_unit_shift, 0, 2);
 934
 935         if(seq->color_config.subsampling_x &&
 936            seq->color_config.subsampling_y && uses_chroma_lr) {
 937             fb(1, lr_uv_shift);
 938         } else {
 939             infer(lr_uv_shift, 0);
 940         }
 941     }
 942
 943     return 0;
 944 }
 945
 946 static int FUNC(read_tx_mode)(CodedBitstreamContext *ctx, RWContext *rw,
 947                               AV1RawFrameHeader *current)
 948 {
 949     CodedBitstreamAV1Context *priv = ctx->priv_data;
 950     int err;
 951
 952     if (priv->coded_lossless)
 953         infer(tx_mode, 0);
 954     else
 955         increment(tx_mode, 1, 2);
 956
 957     return 0;
 958 }
 959
 960 static int FUNC(frame_reference_mode)(CodedBitstreamContext *ctx, RWContext *rw,
 961                                       AV1RawFrameHeader *current)
 962 {
 963     int err;
 964
 965     if (current->frame_type == AV1_FRAME_INTRA_ONLY ||
 966         current->frame_type == AV1_FRAME_KEY)
 967         infer(reference_select, 0);
 968     else
 969         flag(reference_select);
 970
 971     return 0;
 972 }
 973
 974 static int FUNC(skip_mode_params)(CodedBitstreamContext *ctx, RWContext *rw,
 975                                   AV1RawFrameHeader *current)
 976 {
 977     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 978     const AV1RawSequenceHeader *seq = priv->sequence_header;
 979     int skip_mode_allowed;
 980     int err;
 981
 982     if (current->frame_type == AV1_FRAME_KEY ||
 983         current->frame_type == AV1_FRAME_INTRA_ONLY ||
 984         !current->reference_select || !seq->enable_order_hint) {
 985         skip_mode_allowed = 0;
 986     } else {
 987         int forward_idx,  backward_idx;
 988         int forward_hint, backward_hint;
 989         int ref_hint, dist, i;
 990
 991         forward_idx  = -1;
 992         backward_idx = -1;
 993         for (i = 0; i < AV1_REFS_PER_FRAME; i++) {
 994             ref_hint = priv->ref[current->ref_frame_idx[i]].order_hint;
 995             dist = cbs_av1_get_relative_dist(seq, ref_hint,
 996                                              current->order_hint);
 997             if (dist < 0) {
 998                 if (forward_idx < 0 ||
 999                     cbs_av1_get_relative_dist(seq, ref_hint,
1000                                               forward_hint) > 0) {
1001                     forward_idx  = i;
1002                     forward_hint = ref_hint;
1003                 }
1004             } else if (dist > 0) {
1005                 if (backward_idx < 0 ||
1006                     cbs_av1_get_relative_dist(seq, ref_hint,
1007                                               backward_hint) < 0) {
1008                     backward_idx  = i;
1009                     backward_hint = ref_hint;
1010                 }
1011             }
1012         }
1013
1014         if (forward_idx < 0) {
1015             skip_mode_allowed = 0;
1016         } else if (backward_idx >= 0) {
1017             skip_mode_allowed = 1;
1018             // Frames for skip mode are forward_idx and backward_idx.
1019         } else {
1020             int second_forward_idx;
1021             int second_forward_hint;
1022
1023             second_forward_idx = -1;
1024             for (i = 0; i < AV1_REFS_PER_FRAME; i++) {
1025                 ref_hint = priv->ref[current->ref_frame_idx[i]].order_hint;
1026                 if (cbs_av1_get_relative_dist(seq, ref_hint,
1027                                               forward_hint) < 0) {
1028                     if (second_forward_idx < 0 ||
1029                         cbs_av1_get_relative_dist(seq, ref_hint,
1030                                                   second_forward_hint) > 0) {
1031                         second_forward_idx  = i;
1032                         second_forward_hint = ref_hint;
1033                     }
1034                 }
1035             }
1036
1037             if (second_forward_idx < 0) {
1038                 skip_mode_allowed = 0;
1039             } else {
1040                 skip_mode_allowed = 1;
1041                 // Frames for skip mode are forward_idx and second_forward_idx.
1042             }
1043         }
1044     }
1045
1046     if (skip_mode_allowed)
1047         flag(skip_mode_present);
1048     else
1049         infer(skip_mode_present, 0);
1050
1051     return 0;
1052 }
1053
1054 static int FUNC(global_motion_param)(CodedBitstreamContext *ctx, RWContext *rw,
1055                                      AV1RawFrameHeader *current,
1056                                      int type, int ref, int idx)
1057 {
1058     uint32_t abs_bits, prec_bits, num_syms;
1059     int err;
1060
1061     if (idx < 2) {
1062         if (type == AV1_WARP_MODEL_TRANSLATION) {
1063             abs_bits  = AV1_GM_ABS_TRANS_ONLY_BITS  - !current->allow_high_precision_mv;
1064             prec_bits = AV1_GM_TRANS_ONLY_PREC_BITS - !current->allow_high_precision_mv;
1065         } else {
1066             abs_bits  = AV1_GM_ABS_TRANS_BITS;
1067             prec_bits = AV1_GM_TRANS_PREC_BITS;
1068         }
1069     } else {
1070         abs_bits  = AV1_GM_ABS_ALPHA_BITS;
1071         prec_bits = AV1_GM_ALPHA_PREC_BITS;
1072     }
1073
1074     num_syms = 2 * (1 << abs_bits) + 1;
1075     subexp(gm_params[ref][idx], num_syms, 2, ref, idx);
1076
1077     // Actual gm_params value is not reconstructed here.
1078     (void)prec_bits;
1079
1080     return 0;
1081 }
1082
1083 static int FUNC(global_motion_params)(CodedBitstreamContext *ctx, RWContext *rw,
1084                                       AV1RawFrameHeader *current)
1085 {
1086     int ref, type;
1087     int err;
1088
1089     if (current->frame_type == AV1_FRAME_KEY ||
1090         current->frame_type == AV1_FRAME_INTRA_ONLY)
1091         return 0;
1092
1093     for (ref = AV1_REF_FRAME_LAST; ref <= AV1_REF_FRAME_ALTREF; ref++) {
1094         flags(is_global[ref], 1, ref);
1095         if (current->is_global[ref]) {
1096             flags(is_rot_zoom[ref], 1, ref);
1097             if (current->is_rot_zoom[ref]) {
1098                 type = AV1_WARP_MODEL_ROTZOOM;
1099             } else {
1100                 flags(is_translation[ref], 1, ref);
1101                 type = current->is_translation[ref] ? AV1_WARP_MODEL_TRANSLATION
1102                                                     : AV1_WARP_MODEL_AFFINE;
1103             }
1104         } else {
1105             type = AV1_WARP_MODEL_IDENTITY;
1106         }
1107
1108         if (type >= AV1_WARP_MODEL_ROTZOOM) {
1109             CHECK(FUNC(global_motion_param)(ctx, rw, current, type, ref, 2));
1110             CHECK(FUNC(global_motion_param)(ctx, rw, current, type, ref, 3));
1111             if (type == AV1_WARP_MODEL_AFFINE) {
1112                 CHECK(FUNC(global_motion_param)(ctx, rw, current, type, ref, 4));
1113                 CHECK(FUNC(global_motion_param)(ctx, rw, current, type, ref, 5));
1114             } else {
1115                 // gm_params[ref][4] = -gm_params[ref][3]
1116                 // gm_params[ref][5] =  gm_params[ref][2]
1117             }
1118         }
1119         if (type >= AV1_WARP_MODEL_TRANSLATION) {
1120             CHECK(FUNC(global_motion_param)(ctx, rw, current, type, ref, 0));
1121             CHECK(FUNC(global_motion_param)(ctx, rw, current, type, ref, 1));
1122         }
1123     }
1124
1125     return 0;
1126 }
1127
1128 static int FUNC(film_grain_params)(CodedBitstreamContext *ctx, RWContext *rw,
1129                                    AV1RawFrameHeader *current)
1130 {
1131     CodedBitstreamAV1Context  *priv = ctx->priv_data;
1132     const AV1RawSequenceHeader *seq = priv->sequence_header;
1133     int num_pos_luma, num_pos_chroma;
1134     int i, err;
1135
1136     if (!seq->film_grain_params_present ||
1137         (!current->show_frame && !current->showable_frame))
1138         return 0;
1139
1140     flag(apply_grain);
1141
1142     if (!current->apply_grain)
1143         return 0;
1144
1145     fb(16, grain_seed);
1146
1147     if (current->frame_type == AV1_FRAME_INTER)
1148         flag(update_grain);
1149     else
1150         infer(update_grain, 1);
1151
1152     if (!current->update_grain) {
1153         fb(3, film_grain_params_ref_idx);
1154         return 0;
1155     }
1156
1157     fc(4, num_y_points, 0, 14);
1158     for (i = 0; i < current->num_y_points; i++) {
1159         fcs(8, point_y_value[i],
1160             i ? current->point_y_value[i - 1] + 1 : 0,
1161             MAX_UINT_BITS(8) - (current->num_y_points - i - 1),
1162             1, i);
1163         fbs(8, point_y_scaling[i], 1, i);
1164     }
1165
1166     if (seq->color_config.mono_chrome)
1167         infer(chroma_scaling_from_luma, 0);
1168     else
1169         flag(chroma_scaling_from_luma);
1170
1171     if (seq->color_config.mono_chrome ||
1172         current->chroma_scaling_from_luma ||
1173         (seq->color_config.subsampling_x == 1 &&
1174          seq->color_config.subsampling_y == 1 &&
1175          current->num_y_points == 0)) {
1176         infer(num_cb_points, 0);
1177         infer(num_cr_points, 0);
1178     } else {
1179         fc(4, num_cb_points, 0, 10);
1180         for (i = 0; i < current->num_cb_points; i++) {
1181             fcs(8, point_cb_value[i],
1182                 i ? current->point_cb_value[i - 1] + 1 : 0,
1183                 MAX_UINT_BITS(8) - (current->num_cb_points - i - 1),
1184                 1, i);
1185             fbs(8, point_cb_scaling[i], 1, i);
1186         }
1187         fc(4, num_cr_points, 0, 10);
1188         for (i = 0; i < current->num_cr_points; i++) {
1189             fcs(8, point_cr_value[i],
1190                 i ? current->point_cr_value[i - 1] + 1 : 0,
1191                 MAX_UINT_BITS(8) - (current->num_cr_points - i - 1),
1192                 1, i);
1193             fbs(8, point_cr_scaling[i], 1, i);
1194         }
1195     }
1196
1197     fb(2, grain_scaling_minus_8);
1198     fb(2, ar_coeff_lag);
1199     num_pos_luma = 2 * current->ar_coeff_lag * (current->ar_coeff_lag + 1);
1200     if (current->num_y_points) {
1201         num_pos_chroma = num_pos_luma + 1;
1202         for (i = 0; i < num_pos_luma; i++)
1203             fbs(8, ar_coeffs_y_plus_128[i], 1, i);
1204     } else {
1205         num_pos_chroma = num_pos_luma;
1206     }
1207     if (current->chroma_scaling_from_luma || current->num_cb_points) {
1208         for (i = 0; i < num_pos_chroma; i++)
1209             fbs(8, ar_coeffs_cb_plus_128[i], 1, i);
1210     }
1211     if (current->chroma_scaling_from_luma || current->num_cr_points) {
1212         for (i = 0; i < num_pos_chroma; i++)
1213             fbs(8, ar_coeffs_cr_plus_128[i], 1, i);
1214     }
1215     fb(2, ar_coeff_shift_minus_6);
1216     fb(2, grain_scale_shift);
1217     if (current->num_cb_points) {
1218         fb(8, cb_mult);
1219         fb(8, cb_luma_mult);
1220         fb(9, cb_offset);
1221     }
1222     if (current->num_cr_points) {
1223         fb(8, cr_mult);
1224         fb(8, cr_luma_mult);
1225         fb(9, cr_offset);
1226     }
1227
1228     flag(overlap_flag);
1229     flag(clip_to_restricted_range);
1230
1231     return 0;
1232 }
1233
1234 static int FUNC(uncompressed_header)(CodedBitstreamContext *ctx, RWContext *rw,
1235                                      AV1RawFrameHeader *current)
1236 {
1237     CodedBitstreamAV1Context *priv = ctx->priv_data;
1238     const AV1RawSequenceHeader *seq;
1239     int id_len, diff_len, all_frames, frame_is_intra, order_hint_bits;
1240     int i, err;
1241
1242     if (!priv->sequence_header) {
1243         av_log(ctx->log_ctx, AV_LOG_ERROR, "No sequence header available: "
1244                "unable to decode frame header.\n");
1245         return AVERROR_INVALIDDATA;
1246     }
1247     seq = priv->sequence_header;
1248
1249     id_len = seq->additional_frame_id_length_minus_1 +
1250              seq->delta_frame_id_length_minus_2 + 3;
1251     all_frames = (1 << AV1_NUM_REF_FRAMES) - 1;
1252
1253     if (seq->reduced_still_picture_header) {
1254         infer(show_existing_frame, 0);
1255         infer(frame_type,     AV1_FRAME_KEY);
1256         infer(show_frame,     1);
1257         infer(showable_frame, 0);
1258         frame_is_intra = 1;
1259
1260     } else {
1261         flag(show_existing_frame);
1262
1263         if (current->show_existing_frame) {
1264             AV1ReferenceFrameState *frame;
1265
1266             fb(3, frame_to_show_map_idx);
1267             frame = &priv->ref[current->frame_to_show_map_idx];
1268
1269             if (seq->decoder_model_info_present_flag &&
1270                 !seq->timing_info.equal_picture_interval) {
1271                 fb(seq->decoder_model_info.frame_presentation_time_length_minus_1 + 1,
1272                    frame_presentation_time);
1273             }
1274
1275             if (seq->frame_id_numbers_present_flag)
1276                 fb(id_len, display_frame_id);
1277
1278             if (frame->frame_type == AV1_FRAME_KEY)
1279                 infer(refresh_frame_flags, all_frames);
1280             else
1281                 infer(refresh_frame_flags, 0);
1282
1283             return 0;
1284         }
1285
1286         fb(2, frame_type);
1287         frame_is_intra = (current->frame_type == AV1_FRAME_INTRA_ONLY ||
1288                           current->frame_type == AV1_FRAME_KEY);
1289
1290         flag(show_frame);
1291         if (current->show_frame &&
1292             seq->decoder_model_info_present_flag &&
1293             !seq->timing_info.equal_picture_interval) {
1294             fb(seq->decoder_model_info.frame_presentation_time_length_minus_1 + 1,
1295                frame_presentation_time);
1296         }
1297         if (current->show_frame)
1298             infer(showable_frame, current->frame_type != AV1_FRAME_KEY);
1299         else
1300             flag(showable_frame);
1301
1302         if (current->frame_type == AV1_FRAME_SWITCH ||
1303             (current->frame_type == AV1_FRAME_KEY && current->show_frame))
1304             infer(error_resilient_mode, 1);
1305         else
1306             flag(error_resilient_mode);
1307     }
1308
1309     if (current->frame_type == AV1_FRAME_KEY && current->show_frame) {
1310         for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
1311             priv->ref[i].valid = 0;
1312             priv->ref[i].order_hint = 0;
1313         }
1314     }
1315
1316     flag(disable_cdf_update);
1317
1318     if (seq->seq_force_screen_content_tools ==
1319         AV1_SELECT_SCREEN_CONTENT_TOOLS) {
1320         flag(allow_screen_content_tools);
1321     } else {
1322         infer(allow_screen_content_tools,
1323               seq->seq_force_screen_content_tools);
1324     }
1325     if (current->allow_screen_content_tools) {
1326         if (seq->seq_force_integer_mv == AV1_SELECT_INTEGER_MV)
1327             flag(force_integer_mv);
1328         else
1329             infer(force_integer_mv, seq->seq_force_integer_mv);
1330     } else {
1331         infer(force_integer_mv, 0);
1332     }
1333
1334     if (seq->frame_id_numbers_present_flag) {
1335         fb(id_len, current_frame_id);
1336
1337         diff_len = seq->delta_frame_id_length_minus_2 + 2;
1338         for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
1339             if (current->current_frame_id > (1 << diff_len)) {
1340                 if (priv->ref[i].frame_id > current->current_frame_id ||
1341                     priv->ref[i].frame_id < (current->current_frame_id -
1342                                              (1 << diff_len)))
1343                     priv->ref[i].valid = 0;
1344             } else {
1345                 if (priv->ref[i].frame_id > current->current_frame_id &&
1346                     priv->ref[i].frame_id < ((1 << id_len) +
1347                                              current->current_frame_id -
1348                                              (1 << diff_len)))
1349                     priv->ref[i].valid = 0;
1350             }
1351         }
1352     } else {
1353         infer(current_frame_id, 0);
1354     }
1355
1356     if (current->frame_type == AV1_FRAME_SWITCH)
1357         infer(frame_size_override_flag, 1);
1358     else if(seq->reduced_still_picture_header)
1359         infer(frame_size_override_flag, 0);
1360     else
1361         flag(frame_size_override_flag);
1362
1363     order_hint_bits =
1364         seq->enable_order_hint ? seq->order_hint_bits_minus_1 + 1 : 0;
1365     if (order_hint_bits > 0)
1366         fb(order_hint_bits, order_hint);
1367     else
1368         infer(order_hint, 0);
1369
1370     if (frame_is_intra || current->error_resilient_mode)
1371         infer(primary_ref_frame, AV1_PRIMARY_REF_NONE);
1372     else
1373         fb(3, primary_ref_frame);
1374
1375     if (seq->decoder_model_info_present_flag) {
1376         flag(buffer_removal_time_present_flag);
1377         if (current->buffer_removal_time_present_flag) {
1378             for (i = 0; i <= seq->operating_points_cnt_minus_1; i++) {
1379                 if (seq->decoder_model_present_for_this_op[i]) {
1380                     int op_pt_idc = seq->operating_point_idc[i];
1381                     int in_temporal_layer = (op_pt_idc >>  priv->temporal_id    ) & 1;
1382                     int in_spatial_layer  = (op_pt_idc >> (priv->spatial_id + 8)) & 1;
1383                     if (seq->operating_point_idc[i] == 0 ||
1384                         in_temporal_layer || in_spatial_layer) {
1385                         fbs(seq->decoder_model_info.buffer_removal_time_length_minus_1 + 1,
1386                             buffer_removal_time[i], 1, i);
1387                     }
1388                 }
1389             }
1390         }
1391     }
1392
1393     if (current->frame_type == AV1_FRAME_SWITCH ||
1394         (current->frame_type == AV1_FRAME_KEY && current->show_frame))
1395         infer(refresh_frame_flags, all_frames);
1396     else
1397         fb(8, refresh_frame_flags);
1398
1399     if (!frame_is_intra || current->refresh_frame_flags != all_frames) {
1400         if (current->error_resilient_mode && seq->enable_order_hint) {
1401             for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
1402                 fbs(order_hint_bits, ref_order_hint[i], 1, i);
1403                 if (current->ref_order_hint[i] != priv->ref[i].order_hint)
1404                     priv->ref[i].valid = 0;
1405             }
1406         }
1407     }
1408
1409     if (current->frame_type == AV1_FRAME_KEY ||
1410         current->frame_type == AV1_FRAME_INTRA_ONLY) {
1411         CHECK(FUNC(frame_size)(ctx, rw, current));
1412         CHECK(FUNC(render_size)(ctx, rw, current));
1413
1414         if (current->allow_screen_content_tools &&
1415             priv->upscaled_width == priv->frame_width)
1416             flag(allow_intrabc);
1417         else
1418             infer(allow_intrabc, 0);
1419
1420     } else {
1421         if (!seq->enable_order_hint) {
1422             infer(frame_refs_short_signaling, 0);
1423         } else {
1424             flag(frame_refs_short_signaling);
1425             if (current->frame_refs_short_signaling) {
1426                 fb(3, last_frame_idx);
1427                 fb(3, golden_frame_idx);
1428                 CHECK(FUNC(set_frame_refs)(ctx, rw, current));
1429             }
1430         }
1431
1432         for (i = 0; i < AV1_REFS_PER_FRAME; i++) {
1433             if (!current->frame_refs_short_signaling)
1434                 fbs(3, ref_frame_idx[i], 1, i);
1435             if (seq->frame_id_numbers_present_flag) {
1436                 fbs(seq->delta_frame_id_length_minus_2 + 2,
1437                     delta_frame_id_minus1[i], 1, i);
1438             }
1439         }
1440
1441         if (current->frame_size_override_flag &&
1442             !current->error_resilient_mode) {
1443             CHECK(FUNC(frame_size_with_refs)(ctx, rw, current));
1444         } else {
1445             CHECK(FUNC(frame_size)(ctx, rw, current));
1446             CHECK(FUNC(render_size)(ctx, rw, current));
1447         }
1448
1449         if (current->force_integer_mv)
1450             infer(allow_high_precision_mv, 0);
1451         else
1452             flag(allow_high_precision_mv);
1453
1454         CHECK(FUNC(interpolation_filter)(ctx, rw, current));
1455
1456         flag(is_motion_mode_switchable);
1457
1458         if (current->error_resilient_mode ||
1459             !seq->enable_ref_frame_mvs)
1460             infer(use_ref_frame_mvs, 0);
1461         else
1462             flag(use_ref_frame_mvs);
1463
1464         infer(allow_intrabc, 0);
1465     }
1466
1467     if (!frame_is_intra) {
1468         // Derive reference frame sign biases.
1469     }
1470
1471     if (seq->reduced_still_picture_header || current->disable_cdf_update)
1472         infer(disable_frame_end_update_cdf, 1);
1473     else
1474         flag(disable_frame_end_update_cdf);
1475
1476     if (current->primary_ref_frame == AV1_PRIMARY_REF_NONE) {
1477         // Init non-coeff CDFs.
1478         // Setup past independence.
1479     } else {
1480         // Load CDF tables from previous frame.
1481         // Load params from previous frame.
1482     }
1483
1484     if (current->use_ref_frame_mvs) {
1485         // Perform motion field estimation process.
1486     }
1487
1488     CHECK(FUNC(tile_info)(ctx, rw, current));
1489
1490     CHECK(FUNC(quantization_params)(ctx, rw, current));
1491
1492     CHECK(FUNC(segmentation_params)(ctx, rw, current));
1493
1494     CHECK(FUNC(delta_q_params)(ctx, rw, current));
1495
1496     CHECK(FUNC(delta_lf_params)(ctx, rw, current));
1497
1498     // Init coeff CDFs / load previous segments.
1499
1500     priv->coded_lossless = 1;
1501     for (i = 0; i < AV1_MAX_SEGMENTS; i++) {
1502         int qindex;
1503         if (current->feature_enabled[i][AV1_SEG_LVL_ALT_Q]) {
1504             qindex = (current->base_q_idx +
1505                       current->feature_value[i][AV1_SEG_LVL_ALT_Q]);
1506         } else {
1507             qindex = current->base_q_idx;
1508         }
1509         qindex = av_clip_uintp2(qindex, 8);
1510
1511         if (qindex                || current->delta_q_y_dc ||
1512             current->delta_q_u_ac || current->delta_q_u_dc ||
1513             current->delta_q_v_ac || current->delta_q_v_dc) {
1514             priv->coded_lossless = 0;
1515         }
1516     }
1517     priv->all_lossless = priv->coded_lossless &&
1518         priv->frame_width == priv->upscaled_width;
1519
1520     CHECK(FUNC(loop_filter_params)(ctx, rw, current));
1521
1522     CHECK(FUNC(cdef_params)(ctx, rw, current));
1523
1524     CHECK(FUNC(lr_params)(ctx, rw, current));
1525
1526     CHECK(FUNC(read_tx_mode)(ctx, rw, current));
1527
1528     CHECK(FUNC(frame_reference_mode)(ctx, rw, current));
1529
1530     CHECK(FUNC(skip_mode_params)(ctx, rw, current));
1531
1532     if (frame_is_intra || current->error_resilient_mode ||
1533         !seq->enable_warped_motion)
1534         infer(allow_warped_motion, 0);
1535     else
1536         flag(allow_warped_motion);
1537
1538     flag(reduced_tx_set);
1539
1540     CHECK(FUNC(global_motion_params)(ctx, rw, current));
1541
1542     CHECK(FUNC(film_grain_params)(ctx, rw, current));
1543
1544     for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
1545         if (current->refresh_frame_flags & (1 << i)) {
1546             priv->ref[i] = (AV1ReferenceFrameState) {
1547                 .valid          = 1,
1548                 .frame_id       = current->current_frame_id,
1549                 .upscaled_width = priv->upscaled_width,
1550                 .frame_width    = priv->frame_width,
1551                 .frame_height   = priv->frame_height,
1552                 .render_width   = priv->render_width,
1553                 .render_height  = priv->render_height,
1554                 .frame_type     = current->frame_type,
1555                 .subsampling_x  = seq->color_config.subsampling_x,
1556                 .subsampling_y  = seq->color_config.subsampling_y,
1557                 .bit_depth      = priv->bit_depth,
1558                 .order_hint     = current->order_hint,
1559             };
1560         }
1561     }
1562
1563     av_log(ctx->log_ctx, AV_LOG_DEBUG, "Frame %d:  size %dx%d  "
1564            "upscaled %d  render %dx%d  subsample %dx%d  "
1565            "bitdepth %d  tiles %dx%d.\n", current->order_hint,
1566            priv->frame_width, priv->frame_height, priv->upscaled_width,
1567            priv->render_width, priv->render_height,
1568            seq->color_config.subsampling_x + 1,
1569            seq->color_config.subsampling_y + 1, priv->bit_depth,
1570            priv->tile_rows, priv->tile_cols);
1571
1572     return 0;
1573 }
1574
1575 static int FUNC(frame_header_obu)(CodedBitstreamContext *ctx, RWContext *rw,
1576                                   AV1RawFrameHeader *current, int redundant,
1577                                   AVBufferRef *rw_buffer_ref)
1578 {
1579     CodedBitstreamAV1Context *priv = ctx->priv_data;
1580     int start_pos, fh_bits, fh_bytes, err;
1581     uint8_t *fh_start;
1582
1583     if (priv->seen_frame_header) {
1584         if (!redundant) {
1585             av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid repeated "
1586                    "frame header OBU.\n");
1587             return AVERROR_INVALIDDATA;
1588         } else {
1589             GetBitContext fh;
1590             size_t i, b;
1591             uint32_t val;
1592
1593             HEADER("Redundant Frame Header");
1594
1595             av_assert0(priv->frame_header_ref && priv->frame_header);
1596
1597             init_get_bits(&fh, priv->frame_header,
1598                           priv->frame_header_size);
1599             for (i = 0; i < priv->frame_header_size; i += 8) {
1600                 b = FFMIN(priv->frame_header_size - i, 8);
1601                 val = get_bits(&fh, b);
1602                 xf(b, frame_header_copy[i],
1603                    val, val, val, 1, i / 8);
1604             }
1605         }
1606     } else {
1607         if (redundant)
1608             HEADER("Redundant Frame Header (used as Frame Header)");
1609         else
1610             HEADER("Frame Header");
1611
1612 #ifdef READ
1613         start_pos = get_bits_count(rw);
1614 #else
1615         start_pos = put_bits_count(rw);
1616 #endif
1617
1618         CHECK(FUNC(uncompressed_header)(ctx, rw, current));
1619
1620         if (current->show_existing_frame) {
1621             priv->seen_frame_header = 0;
1622         } else {
1623             priv->seen_frame_header = 1;
1624
1625             av_buffer_unref(&priv->frame_header_ref);
1626
1627 #ifdef READ
1628             fh_bits  = get_bits_count(rw) - start_pos;
1629             fh_start = (uint8_t*)rw->buffer + start_pos / 8;
1630 #else
1631             // Need to flush the bitwriter so that we can copy its output,
1632             // but use a copy so we don't affect the caller's structure.
1633             {
1634                 PutBitContext tmp = *rw;
1635                 flush_put_bits(&tmp);
1636             }
1637
1638             fh_bits  = put_bits_count(rw) - start_pos;
1639             fh_start = rw->buf + start_pos / 8;
1640 #endif
1641             fh_bytes = (fh_bits + 7) / 8;
1642
1643             priv->frame_header_size = fh_bits;
1644
1645             if (rw_buffer_ref) {
1646                 priv->frame_header_ref = av_buffer_ref(rw_buffer_ref);
1647                 if (!priv->frame_header_ref)
1648                     return AVERROR(ENOMEM);
1649                 priv->frame_header = fh_start;
1650             } else {
1651                 priv->frame_header_ref =
1652                     av_buffer_alloc(fh_bytes + AV_INPUT_BUFFER_PADDING_SIZE);
1653                 if (!priv->frame_header_ref)
1654                     return AVERROR(ENOMEM);
1655                 priv->frame_header = priv->frame_header_ref->data;
1656                 memcpy(priv->frame_header, fh_start, fh_bytes);
1657             }
1658         }
1659     }
1660
1661     return 0;
1662 }
1663
1664 static int FUNC(tile_group_obu)(CodedBitstreamContext *ctx, RWContext *rw,
1665                                 AV1RawTileGroup *current)
1666 {
1667     CodedBitstreamAV1Context *priv = ctx->priv_data;
1668     int num_tiles, tile_bits;
1669     int err;
1670
1671     HEADER("Tile Group");
1672
1673     num_tiles = priv->tile_cols * priv->tile_rows;
1674     if (num_tiles > 1)
1675         flag(tile_start_and_end_present_flag);
1676     else
1677         infer(tile_start_and_end_present_flag, 0);
1678
1679     if (num_tiles == 1 || !current->tile_start_and_end_present_flag) {
1680         infer(tg_start, 0);
1681         infer(tg_end, num_tiles - 1);
1682     } else {
1683         tile_bits = cbs_av1_tile_log2(1, priv->tile_cols) +
1684                     cbs_av1_tile_log2(1, priv->tile_rows);
1685         fb(tile_bits, tg_start);
1686         fb(tile_bits, tg_end);
1687     }
1688
1689     CHECK(FUNC(byte_alignment)(ctx, rw));
1690
1691     // Reset header for next frame.
1692     if (current->tg_end == num_tiles - 1)
1693         priv->seen_frame_header = 0;
1694
1695     // Tile data follows.
1696
1697     return 0;
1698 }
1699
1700 static int FUNC(frame_obu)(CodedBitstreamContext *ctx, RWContext *rw,
1701                            AV1RawFrame *current,
1702                            AVBufferRef *rw_buffer_ref)
1703 {
1704     int err;
1705
1706     CHECK(FUNC(frame_header_obu)(ctx, rw, &current->header,
1707                                  0, rw_buffer_ref));
1708
1709     CHECK(FUNC(byte_alignment)(ctx, rw));
1710
1711     CHECK(FUNC(tile_group_obu)(ctx, rw, &current->tile_group));
1712
1713     return 0;
1714 }
1715
1716 static int FUNC(tile_list_obu)(CodedBitstreamContext *ctx, RWContext *rw,
1717                                AV1RawTileList *current)
1718 {
1719     int err;
1720
1721     fb(8, output_frame_width_in_tiles_minus_1);
1722     fb(8, output_frame_height_in_tiles_minus_1);
1723
1724     fb(16, tile_count_minus_1);
1725
1726     // Tile data follows.
1727
1728     return 0;
1729 }
1730
1731 static int FUNC(metadata_hdr_cll)(CodedBitstreamContext *ctx, RWContext *rw,
1732                                   AV1RawMetadataHDRCLL *current)
1733 {
1734     int err;
1735
1736     fb(16, max_cll);
1737     fb(16, max_fall);
1738
1739     return 0;
1740 }
1741
1742 static int FUNC(metadata_hdr_mdcv)(CodedBitstreamContext *ctx, RWContext *rw,
1743                                    AV1RawMetadataHDRMDCV *current)
1744 {
1745     int err, i;
1746
1747     for (i = 0; i < 3; i++) {
1748         fbs(16, primary_chromaticity_x[i], 1, i);
1749         fbs(16, primary_chromaticity_y[i], 1, i);
1750     }
1751
1752     fb(16, white_point_chromaticity_x);
1753     fb(16, white_point_chromaticity_y);
1754
1755     fc(32, luminance_max, 1, MAX_UINT_BITS(32));
1756     // luminance_min must be lower than luminance_max. Convert luminance_max from
1757     // 24.8 fixed point to 18.14 fixed point in order to compare them.
1758     fc(32, luminance_min, 0, FFMIN(((uint64_t)current->luminance_max << 6) - 1,
1759                                    MAX_UINT_BITS(32)));
1760
1761     return 0;
1762 }
1763
1764 static int FUNC(scalability_structure)(CodedBitstreamContext *ctx, RWContext *rw,
1765                                        AV1RawMetadataScalability *current)
1766 {
1767     CodedBitstreamAV1Context *priv = ctx->priv_data;
1768     const AV1RawSequenceHeader *seq;
1769     int err, i, j;
1770
1771     if (!priv->sequence_header) {
1772         av_log(ctx->log_ctx, AV_LOG_ERROR, "No sequence header available: "
1773                "unable to parse scalability metadata.\n");
1774         return AVERROR_INVALIDDATA;
1775     }
1776     seq = priv->sequence_header;
1777
1778     fb(2, spatial_layers_cnt_minus_1);
1779     flag(spatial_layer_dimensions_present_flag);
1780     flag(spatial_layer_description_present_flag);
1781     flag(temporal_group_description_present_flag);
1782     fc(3, scalability_structure_reserved_3bits, 0, 0);
1783     if (current->spatial_layer_dimensions_present_flag) {
1784         for (i = 0; i <= current->spatial_layers_cnt_minus_1; i++) {
1785             fcs(16, spatial_layer_max_width[i],
1786                 0, seq->max_frame_width_minus_1 + 1, 1, i);
1787             fcs(16, spatial_layer_max_height[i],
1788                 0, seq->max_frame_height_minus_1 + 1, 1, i);
1789         }
1790     }
1791     if (current->spatial_layer_description_present_flag) {
1792         for (i = 0; i <= current->spatial_layers_cnt_minus_1; i++)
1793             fbs(8, spatial_layer_ref_id[i], 1, i);
1794     }
1795     if (current->temporal_group_description_present_flag) {
1796         fb(8, temporal_group_size);
1797         for (i = 0; i < current->temporal_group_size; i++) {
1798             fbs(3, temporal_group_temporal_id[i], 1, i);
1799             flags(temporal_group_temporal_switching_up_point_flag[i], 1, i);
1800             flags(temporal_group_spatial_switching_up_point_flag[i], 1, i);
1801             fbs(3, temporal_group_ref_cnt[i], 1, i);
1802             for (j = 0; j < current->temporal_group_ref_cnt[i]; j++) {
1803                 fbs(8, temporal_group_ref_pic_diff[i][j], 2, i, j);
1804             }
1805         }
1806     }
1807
1808     return 0;
1809 }
1810
1811 static int FUNC(metadata_scalability)(CodedBitstreamContext *ctx, RWContext *rw,
1812                                       AV1RawMetadataScalability *current)
1813 {
1814     int err;
1815
1816     fb(8, scalability_mode_idc);
1817
1818     if (current->scalability_mode_idc == AV1_SCALABILITY_SS)
1819         CHECK(FUNC(scalability_structure)(ctx, rw, current));
1820
1821     return 0;
1822 }
1823
1824 static int FUNC(metadata_itut_t35)(CodedBitstreamContext *ctx, RWContext *rw,
1825                                    AV1RawMetadataITUTT35 *current)
1826 {
1827     int err;
1828     size_t i;
1829
1830     fb(8, itu_t_t35_country_code);
1831     if (current->itu_t_t35_country_code == 0xff)
1832         fb(8, itu_t_t35_country_code_extension_byte);
1833
1834 #ifdef READ
1835     // The payload runs up to the start of the trailing bits, but there might
1836     // be arbitrarily many trailing zeroes so we need to read through twice.
1837     current->payload_size = cbs_av1_get_payload_bytes_left(rw);
1838
1839     current->payload_ref = av_buffer_alloc(current->payload_size);
1840     if (!current->payload_ref)
1841         return AVERROR(ENOMEM);
1842     current->payload = current->payload_ref->data;
1843 #endif
1844
1845     for (i = 0; i < current->payload_size; i++)
1846         xf(8, itu_t_t35_payload_bytes[i], current->payload[i],
1847            0x00, 0xff, 1, i);
1848
1849     return 0;
1850 }
1851
1852 static int FUNC(metadata_timecode)(CodedBitstreamContext *ctx, RWContext *rw,
1853                                    AV1RawMetadataTimecode *current)
1854 {
1855     int err;
1856
1857     fb(5, counting_type);
1858     flag(full_timestamp_flag);
1859     flag(discontinuity_flag);
1860     flag(cnt_dropped_flag);
1861     fb(9, n_frames);
1862
1863     if (current->full_timestamp_flag) {
1864         fc(6, seconds_value, 0, 59);
1865         fc(6, minutes_value, 0, 59);
1866         fc(5, hours_value,   0, 23);
1867     } else {
1868         flag(seconds_flag);
1869         if (current->seconds_flag) {
1870             fc(6, seconds_value, 0, 59);
1871             flag(minutes_flag);
1872             if (current->minutes_flag) {
1873                 fc(6, minutes_value, 0, 59);
1874                 flag(hours_flag);
1875                 if (current->hours_flag)
1876                     fc(5, hours_value, 0, 23);
1877             }
1878         }
1879     }
1880
1881     fb(5, time_offset_length);
1882     if (current->time_offset_length > 0)
1883         fb(current->time_offset_length, time_offset_value);
1884     else
1885         infer(time_offset_length, 0);
1886
1887     return 0;
1888 }
1889
1890 static int FUNC(metadata_obu)(CodedBitstreamContext *ctx, RWContext *rw,
1891                               AV1RawMetadata *current)
1892 {
1893     int err;
1894
1895     leb128(metadata_type);
1896
1897     switch (current->metadata_type) {
1898     case AV1_METADATA_TYPE_HDR_CLL:
1899         CHECK(FUNC(metadata_hdr_cll)(ctx, rw, &current->metadata.hdr_cll));
1900         break;
1901     case AV1_METADATA_TYPE_HDR_MDCV:
1902         CHECK(FUNC(metadata_hdr_mdcv)(ctx, rw, &current->metadata.hdr_mdcv));
1903         break;
1904     case AV1_METADATA_TYPE_SCALABILITY:
1905         CHECK(FUNC(metadata_scalability)(ctx, rw, &current->metadata.scalability));
1906         break;
1907     case AV1_METADATA_TYPE_ITUT_T35:
1908         CHECK(FUNC(metadata_itut_t35)(ctx, rw, &current->metadata.itut_t35));
1909         break;
1910     case AV1_METADATA_TYPE_TIMECODE:
1911         CHECK(FUNC(metadata_timecode)(ctx, rw, &current->metadata.timecode));
1912         break;
1913     default:
1914         // Unknown metadata type.
1915         return AVERROR_PATCHWELCOME;
1916     }
1917
1918     return 0;
1919 }
1920
1921 static int FUNC(padding_obu)(CodedBitstreamContext *ctx, RWContext *rw,
1922                              AV1RawPadding *current)
1923 {
1924     int i, err;
1925
1926     HEADER("Padding");
1927
1928 #ifdef READ
1929     // The payload runs up to the start of the trailing bits, but there might
1930     // be arbitrarily many trailing zeroes so we need to read through twice.
1931     current->payload_size = cbs_av1_get_payload_bytes_left(rw);
1932
1933     current->payload_ref = av_buffer_alloc(current->payload_size);
1934     if (!current->payload_ref)
1935         return AVERROR(ENOMEM);
1936     current->payload = current->payload_ref->data;
1937 #endif
1938
1939     for (i = 0; i < current->payload_size; i++)
1940         xf(8, obu_padding_byte[i], current->payload[i], 0x00, 0xff, 1, i);
1941
1942     return 0;
1943 }