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     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(superres_params)(CodedBitstreamContext *ctx, RWContext *rw,
 343                                  AV1RawFrameHeader *current)
 344 {
 345     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 346     const AV1RawSequenceHeader *seq = priv->sequence_header;
 347     int denom, err;
 348
 349     if (seq->enable_superres)
 350         flag(use_superres);
 351     else
 352         infer(use_superres, 0);
 353
 354     if (current->use_superres) {
 355         fb(3, coded_denom);
 356         denom = current->coded_denom + AV1_SUPERRES_DENOM_MIN;
 357     } else {
 358         denom = AV1_SUPERRES_NUM;
 359     }
 360
 361     priv->upscaled_width = priv->frame_width;
 362     priv->frame_width = (priv->upscaled_width * AV1_SUPERRES_NUM +
 363                          denom / 2) / denom;
 364
 365     return 0;
 366 }
 367
 368 static int FUNC(frame_size)(CodedBitstreamContext *ctx, RWContext *rw,
 369                             AV1RawFrameHeader *current)
 370 {
 371     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 372     const AV1RawSequenceHeader *seq = priv->sequence_header;
 373     int err;
 374
 375     if (current->frame_size_override_flag) {
 376         fb(seq->frame_width_bits_minus_1 + 1,  frame_width_minus_1);
 377         fb(seq->frame_height_bits_minus_1 + 1, frame_height_minus_1);
 378
 379         priv->frame_width  = current->frame_width_minus_1  + 1;
 380         priv->frame_height = current->frame_height_minus_1 + 1;
 381     } else {
 382         priv->frame_width  = seq->max_frame_width_minus_1  + 1;
 383         priv->frame_height = seq->max_frame_height_minus_1 + 1;
 384     }
 385
 386     CHECK(FUNC(superres_params)(ctx, rw, current));
 387
 388     return 0;
 389 }
 390
 391 static int FUNC(render_size)(CodedBitstreamContext *ctx, RWContext *rw,
 392                              AV1RawFrameHeader *current)
 393 {
 394     CodedBitstreamAV1Context *priv = ctx->priv_data;
 395     int err;
 396
 397     flag(render_and_frame_size_different);
 398
 399     if (current->render_and_frame_size_different) {
 400         fb(16, render_width_minus_1);
 401         fb(16, render_height_minus_1);
 402
 403         priv->render_width  = current->render_width_minus_1  + 1;
 404         priv->render_height = current->render_height_minus_1 + 1;
 405     } else {
 406         priv->render_width  = priv->upscaled_width;
 407         priv->render_height = priv->frame_height;
 408     }
 409
 410     return 0;
 411 }
 412
 413 static int FUNC(frame_size_with_refs)(CodedBitstreamContext *ctx, RWContext *rw,
 414                                       AV1RawFrameHeader *current)
 415 {
 416     CodedBitstreamAV1Context *priv = ctx->priv_data;
 417     int i, err;
 418
 419     for (i = 0; i < AV1_REFS_PER_FRAME; i++) {
 420         flags(found_ref[i], 1, i);
 421         if (current->found_ref[i]) {
 422             AV1ReferenceFrameState *ref =
 423                 &priv->ref[current->ref_frame_idx[i]];
 424
 425             if (!ref->valid) {
 426                 av_log(ctx->log_ctx, AV_LOG_ERROR,
 427                        "Missing reference frame needed for frame size "
 428                        "(ref = %d, ref_frame_idx = %d).\n",
 429                        i, current->ref_frame_idx[i]);
 430                 return AVERROR_INVALIDDATA;
 431             }
 432
 433             priv->upscaled_width = ref->upscaled_width;
 434             priv->frame_width    = ref->frame_width;
 435             priv->frame_height   = ref->frame_height;
 436             priv->render_width   = ref->render_width;
 437             priv->render_height  = ref->render_height;
 438             break;
 439         }
 440     }
 441
 442     if (i >= AV1_REFS_PER_FRAME) {
 443         CHECK(FUNC(frame_size)(ctx, rw, current));
 444         CHECK(FUNC(render_size)(ctx, rw, current));
 445     } else {
 446         CHECK(FUNC(superres_params)(ctx, rw, current));
 447     }
 448
 449     return 0;
 450 }
 451
 452 static int FUNC(interpolation_filter)(CodedBitstreamContext *ctx, RWContext *rw,
 453                                       AV1RawFrameHeader *current)
 454 {
 455     int err;
 456
 457     flag(is_filter_switchable);
 458     if (current->is_filter_switchable)
 459         infer(interpolation_filter,
 460               AV1_INTERPOLATION_FILTER_SWITCHABLE);
 461     else
 462         fb(2, interpolation_filter);
 463
 464     return 0;
 465 }
 466
 467 static int FUNC(tile_info)(CodedBitstreamContext *ctx, RWContext *rw,
 468                            AV1RawFrameHeader *current)
 469 {
 470     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 471     const AV1RawSequenceHeader *seq = priv->sequence_header;
 472     int mi_cols, mi_rows, sb_cols, sb_rows, sb_shift, sb_size;
 473     int max_tile_width_sb, max_tile_height_sb, max_tile_area_sb;
 474     int min_log2_tile_cols, max_log2_tile_cols, max_log2_tile_rows;
 475     int min_log2_tiles, min_log2_tile_rows;
 476     int i, err;
 477
 478     mi_cols = 2 * ((priv->frame_width  + 7) >> 3);
 479     mi_rows = 2 * ((priv->frame_height + 7) >> 3);
 480
 481     sb_cols = seq->use_128x128_superblock ? ((mi_cols + 31) >> 5)
 482                                           : ((mi_cols + 15) >> 4);
 483     sb_rows = seq->use_128x128_superblock ? ((mi_rows + 31) >> 5)
 484                                           : ((mi_rows + 15) >> 4);
 485
 486     sb_shift = seq->use_128x128_superblock ? 5 : 4;
 487     sb_size  = sb_shift + 2;
 488
 489     max_tile_width_sb = AV1_MAX_TILE_WIDTH >> sb_size;
 490     max_tile_area_sb  = AV1_MAX_TILE_AREA  >> (2 * sb_size);
 491
 492     min_log2_tile_cols = cbs_av1_tile_log2(max_tile_width_sb, sb_cols);
 493     max_log2_tile_cols = cbs_av1_tile_log2(1, FFMIN(sb_cols, AV1_MAX_TILE_COLS));
 494     max_log2_tile_rows = cbs_av1_tile_log2(1, FFMIN(sb_rows, AV1_MAX_TILE_ROWS));
 495     min_log2_tiles = FFMAX(min_log2_tile_cols,
 496                            cbs_av1_tile_log2(max_tile_area_sb, sb_rows * sb_cols));
 497
 498     flag(uniform_tile_spacing_flag);
 499
 500     if (current->uniform_tile_spacing_flag) {
 501         int tile_width_sb, tile_height_sb;
 502
 503         increment(tile_cols_log2, min_log2_tile_cols, max_log2_tile_cols);
 504
 505         tile_width_sb = (sb_cols + (1 << current->tile_cols_log2) - 1) >>
 506             current->tile_cols_log2;
 507         current->tile_cols = (sb_cols + tile_width_sb - 1) / tile_width_sb;
 508
 509         min_log2_tile_rows = FFMAX(min_log2_tiles - current->tile_cols_log2, 0);
 510
 511         increment(tile_rows_log2, min_log2_tile_rows, max_log2_tile_rows);
 512
 513         tile_height_sb = (sb_rows + (1 << current->tile_rows_log2) - 1) >>
 514             current->tile_rows_log2;
 515         current->tile_rows = (sb_rows + tile_height_sb - 1) / tile_height_sb;
 516
 517     } else {
 518         int widest_tile_sb, start_sb, size_sb, max_width, max_height;
 519
 520         widest_tile_sb = 0;
 521
 522         start_sb = 0;
 523         for (i = 0; start_sb < sb_cols && i < AV1_MAX_TILE_COLS; i++) {
 524             max_width = FFMIN(sb_cols - start_sb, max_tile_width_sb);
 525             ns(max_width, width_in_sbs_minus_1[i], 1, i);
 526             size_sb = current->width_in_sbs_minus_1[i] + 1;
 527             widest_tile_sb = FFMAX(size_sb, widest_tile_sb);
 528             start_sb += size_sb;
 529         }
 530         current->tile_cols_log2 = cbs_av1_tile_log2(1, i);
 531         current->tile_cols = i;
 532
 533         if (min_log2_tiles > 0)
 534             max_tile_area_sb = (sb_rows * sb_cols) >> (min_log2_tiles + 1);
 535         else
 536             max_tile_area_sb = sb_rows * sb_cols;
 537         max_tile_height_sb = FFMAX(max_tile_area_sb / widest_tile_sb, 1);
 538
 539         start_sb = 0;
 540         for (i = 0; start_sb < sb_rows && i < AV1_MAX_TILE_ROWS; i++) {
 541             max_height = FFMIN(sb_rows - start_sb, max_tile_height_sb);
 542             ns(max_height, height_in_sbs_minus_1[i], 1, i);
 543             size_sb = current->height_in_sbs_minus_1[i] + 1;
 544             start_sb += size_sb;
 545         }
 546         current->tile_rows_log2 = cbs_av1_tile_log2(1, i);
 547         current->tile_rows = i;
 548     }
 549
 550     if (current->tile_cols_log2 > 0 ||
 551         current->tile_rows_log2 > 0) {
 552         fb(current->tile_cols_log2 + current->tile_rows_log2,
 553            context_update_tile_id);
 554         fb(2, tile_size_bytes_minus1);
 555     } else {
 556         infer(context_update_tile_id, 0);
 557     }
 558
 559     priv->tile_cols = current->tile_cols;
 560     priv->tile_rows = current->tile_rows;
 561
 562     return 0;
 563 }
 564
 565 static int FUNC(quantization_params)(CodedBitstreamContext *ctx, RWContext *rw,
 566                                      AV1RawFrameHeader *current)
 567 {
 568     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 569     const AV1RawSequenceHeader *seq = priv->sequence_header;
 570     int err;
 571
 572     fb(8, base_q_idx);
 573
 574     delta_q(delta_q_y_dc);
 575
 576     if (priv->num_planes > 1) {
 577         if (seq->color_config.separate_uv_delta_q)
 578             flag(diff_uv_delta);
 579         else
 580             infer(diff_uv_delta, 0);
 581
 582         delta_q(delta_q_u_dc);
 583         delta_q(delta_q_u_ac);
 584
 585         if (current->diff_uv_delta) {
 586             delta_q(delta_q_v_dc);
 587             delta_q(delta_q_v_ac);
 588         } else {
 589             infer(delta_q_v_dc, current->delta_q_u_dc);
 590             infer(delta_q_v_ac, current->delta_q_u_ac);
 591         }
 592     } else {
 593         infer(delta_q_u_dc, 0);
 594         infer(delta_q_u_ac, 0);
 595         infer(delta_q_v_dc, 0);
 596         infer(delta_q_v_ac, 0);
 597     }
 598
 599     flag(using_qmatrix);
 600     if (current->using_qmatrix) {
 601         fb(4, qm_y);
 602         fb(4, qm_u);
 603         if (seq->color_config.separate_uv_delta_q)
 604             fb(4, qm_v);
 605         else
 606             infer(qm_v, current->qm_u);
 607     }
 608
 609     return 0;
 610 }
 611
 612 static int FUNC(segmentation_params)(CodedBitstreamContext *ctx, RWContext *rw,
 613                                      AV1RawFrameHeader *current)
 614 {
 615     static const uint8_t bits[AV1_SEG_LVL_MAX] = { 8, 6, 6, 6, 6, 3, 0, 0 };
 616     static const uint8_t sign[AV1_SEG_LVL_MAX] = { 1, 1, 1, 1, 1, 0, 0, 0 };
 617     int i, j, err;
 618
 619     flag(segmentation_enabled);
 620
 621     if (current->segmentation_enabled) {
 622         if (current->primary_ref_frame == AV1_PRIMARY_REF_NONE) {
 623             infer(segmentation_update_map,      1);
 624             infer(segmentation_temporal_update, 0);
 625             infer(segmentation_update_data,     1);
 626         } else {
 627             flag(segmentation_update_map);
 628             if (current->segmentation_update_map)
 629                 flag(segmentation_temporal_update);
 630             else
 631                 infer(segmentation_temporal_update, 0);
 632             flag(segmentation_update_data);
 633         }
 634
 635         if (current->segmentation_update_data) {
 636             for (i = 0; i < AV1_MAX_SEGMENTS; i++) {
 637                 for (j = 0; j < AV1_SEG_LVL_MAX; j++) {
 638                     flags(feature_enabled[i][j], 2, i, j);
 639
 640                     if (current->feature_enabled[i][j] && bits[j] > 0) {
 641                         if (sign[j])
 642                             sus(1 + bits[j], feature_value[i][j], 2, i, j);
 643                         else
 644                             fbs(bits[j], feature_value[i][j], 2, i, j);
 645                     } else {
 646                         infer(feature_value[i][j], 0);
 647                     }
 648                 }
 649             }
 650         }
 651     } else {
 652         for (i = 0; i < AV1_MAX_SEGMENTS; i++) {
 653             for (j = 0; j < AV1_SEG_LVL_MAX; j++) {
 654                 infer(feature_enabled[i][j], 0);
 655                 infer(feature_value[i][j],   0);
 656             }
 657         }
 658     }
 659
 660     return 0;
 661 }
 662
 663 static int FUNC(delta_q_params)(CodedBitstreamContext *ctx, RWContext *rw,
 664                                 AV1RawFrameHeader *current)
 665 {
 666     int err;
 667
 668     if (current->base_q_idx > 0)
 669         flag(delta_q_present);
 670     else
 671         infer(delta_q_present, 0);
 672
 673     if (current->delta_q_present)
 674         fb(2, delta_q_res);
 675
 676     return 0;
 677 }
 678
 679 static int FUNC(delta_lf_params)(CodedBitstreamContext *ctx, RWContext *rw,
 680                                  AV1RawFrameHeader *current)
 681 {
 682     int err;
 683
 684     if (current->delta_q_present) {
 685         if (!current->allow_intrabc)
 686             flag(delta_lf_present);
 687         else
 688             infer(delta_lf_present, 0);
 689         if (current->delta_lf_present) {
 690             fb(2, delta_lf_res);
 691             flag(delta_lf_multi);
 692         } else {
 693             infer(delta_lf_res,   0);
 694             infer(delta_lf_multi, 0);
 695         }
 696     } else {
 697         infer(delta_lf_present, 0);
 698         infer(delta_lf_res,     0);
 699         infer(delta_lf_multi,   0);
 700     }
 701
 702     return 0;
 703 }
 704
 705 static int FUNC(loop_filter_params)(CodedBitstreamContext *ctx, RWContext *rw,
 706                                     AV1RawFrameHeader *current)
 707 {
 708     CodedBitstreamAV1Context *priv = ctx->priv_data;
 709     int i, err;
 710
 711     if (priv->coded_lossless || current->allow_intrabc) {
 712         infer(loop_filter_level[0], 0);
 713         infer(loop_filter_level[1], 0);
 714         infer(loop_filter_ref_deltas[AV1_REF_FRAME_INTRA],    1);
 715         infer(loop_filter_ref_deltas[AV1_REF_FRAME_LAST],     0);
 716         infer(loop_filter_ref_deltas[AV1_REF_FRAME_LAST2],    0);
 717         infer(loop_filter_ref_deltas[AV1_REF_FRAME_LAST3],    0);
 718         infer(loop_filter_ref_deltas[AV1_REF_FRAME_BWDREF],   0);
 719         infer(loop_filter_ref_deltas[AV1_REF_FRAME_GOLDEN],  -1);
 720         infer(loop_filter_ref_deltas[AV1_REF_FRAME_ALTREF],  -1);
 721         infer(loop_filter_ref_deltas[AV1_REF_FRAME_ALTREF2], -1);
 722         for (i = 0; i < 2; i++)
 723             infer(loop_filter_mode_deltas[i], 0);
 724         return 0;
 725     }
 726
 727     fb(6, loop_filter_level[0]);
 728     fb(6, loop_filter_level[1]);
 729
 730     if (priv->num_planes > 1) {
 731         if (current->loop_filter_level[0] ||
 732             current->loop_filter_level[1]) {
 733             fb(6, loop_filter_level[2]);
 734             fb(6, loop_filter_level[3]);
 735         }
 736     }
 737
 738     fb(3, loop_filter_sharpness);
 739
 740     flag(loop_filter_delta_enabled);
 741     if (current->loop_filter_delta_enabled) {
 742         flag(loop_filter_delta_update);
 743         if (current->loop_filter_delta_update) {
 744             for (i = 0; i < AV1_TOTAL_REFS_PER_FRAME; i++) {
 745                 flags(update_ref_delta[i], 1, i);
 746                 if (current->update_ref_delta[i])
 747                     sus(1 + 6, loop_filter_ref_deltas[i], 1, i);
 748             }
 749             for (i = 0; i < 2; i++) {
 750                 flags(update_mode_delta[i], 1, i);
 751                 if (current->update_mode_delta[i])
 752                     sus(1 + 6, loop_filter_mode_deltas[i], 1, i);
 753             }
 754         }
 755     }
 756
 757     return 0;
 758 }
 759
 760 static int FUNC(cdef_params)(CodedBitstreamContext *ctx, RWContext *rw,
 761                              AV1RawFrameHeader *current)
 762 {
 763     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 764     const AV1RawSequenceHeader *seq = priv->sequence_header;
 765     int i, err;
 766
 767     if (priv->coded_lossless || current->allow_intrabc ||
 768         !seq->enable_cdef) {
 769         infer(cdef_damping_minus_3, 0);
 770         infer(cdef_bits, 0);
 771         infer(cdef_y_pri_strength[0],  0);
 772         infer(cdef_y_sec_strength[0],  0);
 773         infer(cdef_uv_pri_strength[0], 0);
 774         infer(cdef_uv_sec_strength[0], 0);
 775
 776         return 0;
 777     }
 778
 779     fb(2, cdef_damping_minus_3);
 780     fb(2, cdef_bits);
 781
 782     for (i = 0; i < (1 << current->cdef_bits); i++) {
 783         fbs(4, cdef_y_pri_strength[i], 1, i);
 784         fbs(2, cdef_y_sec_strength[i], 1, i);
 785
 786         if (priv->num_planes > 1) {
 787             fbs(4, cdef_uv_pri_strength[i], 1, i);
 788             fbs(2, cdef_uv_sec_strength[i], 1, i);
 789         }
 790     }
 791
 792     return 0;
 793 }
 794
 795 static int FUNC(lr_params)(CodedBitstreamContext *ctx, RWContext *rw,
 796                            AV1RawFrameHeader *current)
 797 {
 798     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 799     const AV1RawSequenceHeader *seq = priv->sequence_header;
 800     int uses_lr,  uses_chroma_lr;
 801     int i, err;
 802
 803     if (priv->all_lossless || current->allow_intrabc ||
 804         !seq->enable_restoration) {
 805         return 0;
 806     }
 807
 808     uses_lr = uses_chroma_lr = 0;
 809     for (i = 0; i < priv->num_planes; i++) {
 810         fbs(2, lr_type[i], 1, i);
 811
 812         if (current->lr_type[i] != 0) {
 813             uses_lr = 1;
 814             if (i > 0)
 815                 uses_chroma_lr = 1;
 816         }
 817     }
 818
 819     if (uses_lr) {
 820         if (seq->use_128x128_superblock)
 821             increment(lr_unit_shift, 1, 2);
 822         else
 823             increment(lr_unit_shift, 0, 2);
 824
 825         if(seq->color_config.subsampling_x &&
 826            seq->color_config.subsampling_y && uses_chroma_lr) {
 827             fb(1, lr_uv_shift);
 828         } else {
 829             infer(lr_uv_shift, 0);
 830         }
 831     }
 832
 833     return 0;
 834 }
 835
 836 static int FUNC(read_tx_mode)(CodedBitstreamContext *ctx, RWContext *rw,
 837                               AV1RawFrameHeader *current)
 838 {
 839     CodedBitstreamAV1Context *priv = ctx->priv_data;
 840     int err;
 841
 842     if (priv->coded_lossless)
 843         infer(tx_mode, 0);
 844     else
 845         increment(tx_mode, 1, 2);
 846
 847     return 0;
 848 }
 849
 850 static int FUNC(frame_reference_mode)(CodedBitstreamContext *ctx, RWContext *rw,
 851                                       AV1RawFrameHeader *current)
 852 {
 853     int err;
 854
 855     if (current->frame_type == AV1_FRAME_INTRA_ONLY ||
 856         current->frame_type == AV1_FRAME_KEY)
 857         infer(reference_select, 0);
 858     else
 859         flag(reference_select);
 860
 861     return 0;
 862 }
 863
 864 static int FUNC(skip_mode_params)(CodedBitstreamContext *ctx, RWContext *rw,
 865                                   AV1RawFrameHeader *current)
 866 {
 867     CodedBitstreamAV1Context  *priv = ctx->priv_data;
 868     const AV1RawSequenceHeader *seq = priv->sequence_header;
 869     int skip_mode_allowed;
 870     int err;
 871
 872     if (current->frame_type == AV1_FRAME_KEY ||
 873         current->frame_type == AV1_FRAME_INTRA_ONLY ||
 874         !current->reference_select || !seq->enable_order_hint) {
 875         skip_mode_allowed = 0;
 876     } else {
 877         int forward_idx,  backward_idx;
 878         int forward_hint, backward_hint;
 879         int ref_hint, dist, i;
 880
 881         forward_idx  = -1;
 882         backward_idx = -1;
 883         for (i = 0; i < AV1_REFS_PER_FRAME; i++) {
 884             ref_hint = priv->ref[i].order_hint;
 885             dist = cbs_av1_get_relative_dist(seq, ref_hint,
 886                                              current->order_hint);
 887             if (dist < 0) {
 888                 if (forward_idx < 0 ||
 889                     cbs_av1_get_relative_dist(seq, ref_hint,
 890                                               forward_hint) > 0) {
 891                     forward_idx  = i;
 892                     forward_hint = ref_hint;
 893                 }
 894             } else if (dist > 0) {
 895                 if (backward_idx < 0 ||
 896                     cbs_av1_get_relative_dist(seq, ref_hint,
 897                                               backward_hint) < 0) {
 898                     backward_idx  = i;
 899                     backward_hint = ref_hint;
 900                 }
 901             }
 902         }
 903
 904         if (forward_idx < 0) {
 905             skip_mode_allowed = 0;
 906         } else if (backward_idx >= 0) {
 907             skip_mode_allowed = 1;
 908             // Frames for skip mode are forward_idx and backward_idx.
 909         } else {
 910             int second_forward_idx;
 911             int second_forward_hint;
 912
 913             second_forward_idx = -1;
 914             for (i = 0; i < AV1_REFS_PER_FRAME; i++) {
 915                 ref_hint = priv->ref[i].order_hint;
 916                 if (cbs_av1_get_relative_dist(seq, ref_hint,
 917                                               forward_hint) < 0) {
 918                     if (second_forward_idx < 0 ||
 919                         cbs_av1_get_relative_dist(seq, ref_hint,
 920                                                   second_forward_hint) > 0) {
 921                         second_forward_idx  = i;
 922                         second_forward_hint = ref_hint;
 923                     }
 924                 }
 925             }
 926
 927             if (second_forward_idx < 0) {
 928                 skip_mode_allowed = 0;
 929             } else {
 930                 skip_mode_allowed = 1;
 931                 // Frames for skip mode are forward_idx and second_forward_idx.
 932             }
 933         }
 934     }
 935
 936     if (skip_mode_allowed)
 937         flag(skip_mode_present);
 938     else
 939         infer(skip_mode_present, 0);
 940
 941     return 0;
 942 }
 943
 944 static int FUNC(global_motion_param)(CodedBitstreamContext *ctx, RWContext *rw,
 945                                      AV1RawFrameHeader *current,
 946                                      int type, int ref, int idx)
 947 {
 948     uint32_t abs_bits, prec_bits, num_syms;
 949     int err;
 950
 951     if (idx < 2) {
 952         if (type == AV1_WARP_MODEL_TRANSLATION) {
 953             abs_bits  = AV1_GM_ABS_TRANS_ONLY_BITS  - !current->allow_high_precision_mv;
 954             prec_bits = AV1_GM_TRANS_ONLY_PREC_BITS - !current->allow_high_precision_mv;
 955         } else {
 956             abs_bits  = AV1_GM_ABS_TRANS_BITS;
 957             prec_bits = AV1_GM_TRANS_PREC_BITS;
 958         }
 959     } else {
 960         abs_bits  = AV1_GM_ABS_ALPHA_BITS;
 961         prec_bits = AV1_GM_ALPHA_PREC_BITS;
 962     }
 963
 964     num_syms = 2 * (1 << abs_bits) + 1;
 965     subexp(gm_params[ref][idx], num_syms, 2, ref, idx);
 966
 967     // Actual gm_params value is not reconstructed here.
 968     (void)prec_bits;
 969
 970     return 0;
 971 }
 972
 973 static int FUNC(global_motion_params)(CodedBitstreamContext *ctx, RWContext *rw,
 974                                       AV1RawFrameHeader *current)
 975 {
 976     int ref, type;
 977     int err;
 978
 979     if (current->frame_type == AV1_FRAME_KEY ||
 980         current->frame_type == AV1_FRAME_INTRA_ONLY)
 981         return 0;
 982
 983     for (ref = AV1_REF_FRAME_LAST; ref <= AV1_REF_FRAME_ALTREF; ref++) {
 984         flags(is_global[ref], 1, ref);
 985         if (current->is_global[ref]) {
 986             flags(is_rot_zoom[ref], 1, ref);
 987             if (current->is_rot_zoom[ref]) {
 988                 type = AV1_WARP_MODEL_ROTZOOM;
 989             } else {
 990                 flags(is_translation[ref], 1, ref);
 991                 type = current->is_translation[ref] ? AV1_WARP_MODEL_TRANSLATION
 992                                                     : AV1_WARP_MODEL_AFFINE;
 993             }
 994         } else {
 995             type = AV1_WARP_MODEL_IDENTITY;
 996         }
 997
 998         if (type >= AV1_WARP_MODEL_ROTZOOM) {
 999             CHECK(FUNC(global_motion_param)(ctx, rw, current, type, ref, 2));
1000             CHECK(FUNC(global_motion_param)(ctx, rw, current, type, ref, 3));
1001             if (type == AV1_WARP_MODEL_AFFINE) {
1002                 CHECK(FUNC(global_motion_param)(ctx, rw, current, type, ref, 4));
1003                 CHECK(FUNC(global_motion_param)(ctx, rw, current, type, ref, 5));
1004             } else {
1005                 // gm_params[ref][4] = -gm_params[ref][3]
1006                 // gm_params[ref][5] =  gm_params[ref][2]
1007             }
1008         }
1009         if (type >= AV1_WARP_MODEL_TRANSLATION) {
1010             CHECK(FUNC(global_motion_param)(ctx, rw, current, type, ref, 0));
1011             CHECK(FUNC(global_motion_param)(ctx, rw, current, type, ref, 1));
1012         }
1013     }
1014
1015     return 0;
1016 }
1017
1018 static int FUNC(film_grain_params)(CodedBitstreamContext *ctx, RWContext *rw,
1019                                    AV1RawFrameHeader *current)
1020 {
1021     CodedBitstreamAV1Context  *priv = ctx->priv_data;
1022     const AV1RawSequenceHeader *seq = priv->sequence_header;
1023     int num_pos_luma, num_pos_chroma;
1024     int i, err;
1025
1026     if (!seq->film_grain_params_present ||
1027         (!current->show_frame && !current->showable_frame))
1028         return 0;
1029
1030     flag(apply_grain);
1031
1032     if (!current->apply_grain)
1033         return 0;
1034
1035     fb(16, grain_seed);
1036
1037     if (current->frame_type == AV1_FRAME_INTER)
1038         flag(update_grain);
1039     else
1040         infer(update_grain, 1);
1041
1042     if (!current->update_grain) {
1043         fb(3, film_grain_params_ref_idx);
1044         return 0;
1045     }
1046
1047     fb(4, num_y_points);
1048     for (i = 0; i < current->num_y_points; i++) {
1049         fbs(8, point_y_value[i],   1, i);
1050         fbs(8, point_y_scaling[i], 1, i);
1051     }
1052
1053     if (seq->color_config.mono_chrome)
1054         infer(chroma_scaling_from_luma, 0);
1055     else
1056         flag(chroma_scaling_from_luma);
1057
1058     if (seq->color_config.mono_chrome ||
1059         current->chroma_scaling_from_luma ||
1060         (seq->color_config.subsampling_x == 1 &&
1061          seq->color_config.subsampling_y == 1 &&
1062          current->num_y_points == 0)) {
1063         infer(num_cb_points, 0);
1064         infer(num_cr_points, 0);
1065     } else {
1066         fb(4, num_cb_points);
1067         for (i = 0; i < current->num_cb_points; i++) {
1068             fbs(8, point_cb_value[i],   1, i);
1069             fbs(8, point_cb_scaling[i], 1, i);
1070         }
1071         fb(4, num_cr_points);
1072         for (i = 0; i < current->num_cr_points; i++) {
1073             fbs(8, point_cr_value[i],   1, i);
1074             fbs(8, point_cr_scaling[i], 1, i);
1075         }
1076     }
1077
1078     fb(2, grain_scaling_minus_8);
1079     fb(2, ar_coeff_lag);
1080     num_pos_luma = 2 * current->ar_coeff_lag * (current->ar_coeff_lag + 1);
1081     if (current->num_y_points) {
1082         num_pos_chroma = num_pos_luma + 1;
1083         for (i = 0; i < num_pos_luma; i++)
1084             fbs(8, ar_coeffs_y_plus_128[i], 1, i);
1085     } else {
1086         num_pos_chroma = num_pos_luma;
1087     }
1088     if (current->chroma_scaling_from_luma || current->num_cb_points) {
1089         for (i = 0; i < num_pos_chroma; i++)
1090             fbs(8, ar_coeffs_cb_plus_128[i], 1, i);
1091     }
1092     if (current->chroma_scaling_from_luma || current->num_cr_points) {
1093         for (i = 0; i < num_pos_chroma; i++)
1094             fbs(8, ar_coeffs_cr_plus_128[i], 1, i);
1095     }
1096     fb(2, ar_coeff_shift_minus_6);
1097     fb(2, grain_scale_shift);
1098     if (current->num_cb_points) {
1099         fb(8, cb_mult);
1100         fb(8, cb_luma_mult);
1101         fb(9, cb_offset);
1102     }
1103     if (current->num_cr_points) {
1104         fb(8, cr_mult);
1105         fb(8, cr_luma_mult);
1106         fb(9, cr_offset);
1107     }
1108
1109     flag(overlap_flag);
1110     flag(clip_to_restricted_range);
1111
1112     return 0;
1113 }
1114
1115 static int FUNC(uncompressed_header)(CodedBitstreamContext *ctx, RWContext *rw,
1116                                      AV1RawFrameHeader *current)
1117 {
1118     CodedBitstreamAV1Context *priv = ctx->priv_data;
1119     const AV1RawSequenceHeader *seq;
1120     int id_len, diff_len, all_frames, frame_is_intra, order_hint_bits;
1121     int i, err;
1122
1123     if (!priv->sequence_header) {
1124         av_log(ctx->log_ctx, AV_LOG_ERROR, "No sequence header available: "
1125                "unable to decode frame header.\n");
1126         return AVERROR_INVALIDDATA;
1127     }
1128     seq = priv->sequence_header;
1129
1130     id_len = seq->additional_frame_id_length_minus_1 +
1131              seq->delta_frame_id_length_minus_2 + 3;
1132     all_frames = (1 << AV1_NUM_REF_FRAMES) - 1;
1133
1134     if (seq->reduced_still_picture_header) {
1135         infer(show_existing_frame, 0);
1136         infer(frame_type,     AV1_FRAME_KEY);
1137         infer(show_frame,     1);
1138         infer(showable_frame, 0);
1139         frame_is_intra = 1;
1140
1141     } else {
1142         flag(show_existing_frame);
1143
1144         if (current->show_existing_frame) {
1145             AV1ReferenceFrameState *frame;
1146
1147             fb(3, frame_to_show_map_idx);
1148             frame = &priv->ref[current->frame_to_show_map_idx];
1149
1150             if (seq->decoder_model_info_present_flag &&
1151                 !seq->timing_info.equal_picture_interval) {
1152                 fb(seq->decoder_model_info.frame_presentation_time_length_minus_1 + 1,
1153                    frame_presentation_time);
1154             }
1155
1156             if (seq->frame_id_numbers_present_flag)
1157                 fb(id_len, display_frame_id);
1158
1159             if (frame->frame_type == AV1_FRAME_KEY)
1160                 infer(refresh_frame_flags, all_frames);
1161             else
1162                 infer(refresh_frame_flags, 0);
1163
1164             return 0;
1165         }
1166
1167         fb(2, frame_type);
1168         frame_is_intra = (current->frame_type == AV1_FRAME_INTRA_ONLY ||
1169                           current->frame_type == AV1_FRAME_KEY);
1170
1171         flag(show_frame);
1172         if (current->show_frame &&
1173             seq->decoder_model_info_present_flag &&
1174             !seq->timing_info.equal_picture_interval) {
1175             fb(seq->decoder_model_info.frame_presentation_time_length_minus_1 + 1,
1176                frame_presentation_time);
1177         }
1178         if (current->show_frame)
1179             infer(showable_frame, current->frame_type != AV1_FRAME_KEY);
1180         else
1181             flag(showable_frame);
1182
1183         if (current->frame_type == AV1_FRAME_SWITCH ||
1184             (current->frame_type == AV1_FRAME_KEY && current->show_frame))
1185             infer(error_resilient_mode, 1);
1186         else
1187             flag(error_resilient_mode);
1188     }
1189
1190     if (current->frame_type == AV1_FRAME_KEY && current->show_frame) {
1191         for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
1192             priv->ref[i].valid = 0;
1193             priv->ref[i].order_hint = 0;
1194         }
1195     }
1196
1197     flag(disable_cdf_update);
1198
1199     if (seq->seq_force_screen_content_tools ==
1200         AV1_SELECT_SCREEN_CONTENT_TOOLS) {
1201         flag(allow_screen_content_tools);
1202     } else {
1203         infer(allow_screen_content_tools,
1204               seq->seq_force_screen_content_tools);
1205     }
1206     if (current->allow_screen_content_tools) {
1207         if (seq->seq_force_integer_mv == AV1_SELECT_INTEGER_MV)
1208             flag(force_integer_mv);
1209         else
1210             infer(force_integer_mv, seq->seq_force_integer_mv);
1211     } else {
1212         infer(force_integer_mv, 0);
1213     }
1214
1215     if (seq->frame_id_numbers_present_flag) {
1216         fb(id_len, current_frame_id);
1217
1218         diff_len = seq->delta_frame_id_length_minus_2 + 2;
1219         for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
1220             if (current->current_frame_id > (1 << diff_len)) {
1221                 if (priv->ref[i].frame_id > current->current_frame_id ||
1222                     priv->ref[i].frame_id < (current->current_frame_id -
1223                                              (1 << diff_len)))
1224                     priv->ref[i].valid = 0;
1225             } else {
1226                 if (priv->ref[i].frame_id > current->current_frame_id &&
1227                     priv->ref[i].frame_id < ((1 << id_len) +
1228                                              current->current_frame_id -
1229                                              (1 << diff_len)))
1230                     priv->ref[i].valid = 0;
1231             }
1232         }
1233     } else {
1234         infer(current_frame_id, 0);
1235     }
1236
1237     if (current->frame_type == AV1_FRAME_SWITCH)
1238         infer(frame_size_override_flag, 1);
1239     else if(seq->reduced_still_picture_header)
1240         infer(frame_size_override_flag, 0);
1241     else
1242         flag(frame_size_override_flag);
1243
1244     order_hint_bits =
1245         seq->enable_order_hint ? seq->order_hint_bits_minus_1 + 1 : 0;
1246     if (order_hint_bits > 0)
1247         fb(order_hint_bits, order_hint);
1248     else
1249         infer(order_hint, 0);
1250
1251     if (frame_is_intra || current->error_resilient_mode)
1252         infer(primary_ref_frame, AV1_PRIMARY_REF_NONE);
1253     else
1254         fb(3, primary_ref_frame);
1255
1256     if (seq->decoder_model_info_present_flag) {
1257         flag(buffer_removal_time_present_flag);
1258         if (current->buffer_removal_time_present_flag) {
1259             for (i = 0; i <= seq->operating_points_cnt_minus_1; i++) {
1260                 if (seq->decoder_model_present_for_this_op[i]) {
1261                     int op_pt_idc = seq->operating_point_idc[i];
1262                     int in_temporal_layer = (op_pt_idc >>  priv->temporal_id    ) & 1;
1263                     int in_spatial_layer  = (op_pt_idc >> (priv->spatial_id + 8)) & 1;
1264                     if (seq->operating_point_idc[i] == 0 ||
1265                         in_temporal_layer || in_spatial_layer) {
1266                         fbs(seq->decoder_model_info.buffer_removal_time_length_minus_1 + 1,
1267                             buffer_removal_time[i], 1, i);
1268                     }
1269                 }
1270             }
1271         }
1272     }
1273
1274     if (current->frame_type == AV1_FRAME_SWITCH ||
1275         (current->frame_type == AV1_FRAME_KEY && current->show_frame))
1276         infer(refresh_frame_flags, all_frames);
1277     else
1278         fb(8, refresh_frame_flags);
1279
1280     if (!frame_is_intra || current->refresh_frame_flags != all_frames) {
1281         if (current->error_resilient_mode && seq->enable_order_hint) {
1282             for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
1283                 fbs(order_hint_bits, ref_order_hint[i], 1, i);
1284                 if (current->ref_order_hint[i] != priv->ref[i].order_hint)
1285                     priv->ref[i].valid = 0;
1286             }
1287         }
1288     }
1289
1290     if (current->frame_type == AV1_FRAME_KEY ||
1291         current->frame_type == AV1_FRAME_INTRA_ONLY) {
1292         CHECK(FUNC(frame_size)(ctx, rw, current));
1293         CHECK(FUNC(render_size)(ctx, rw, current));
1294
1295         if (current->allow_screen_content_tools &&
1296             priv->upscaled_width == priv->frame_width)
1297             flag(allow_intrabc);
1298         else
1299             infer(allow_intrabc, 0);
1300
1301     } else {
1302         if (!seq->enable_order_hint) {
1303             infer(frame_refs_short_signaling, 0);
1304         } else {
1305             flag(frame_refs_short_signaling);
1306             if (current->frame_refs_short_signaling) {
1307                 fb(3, last_frame_idx);
1308                 fb(3, golden_frame_idx);
1309
1310                 for (i = 0; i < AV1_REFS_PER_FRAME; i++) {
1311                     if (i == 0)
1312                         infer(ref_frame_idx[i], current->last_frame_idx);
1313                     else if (i == AV1_REF_FRAME_GOLDEN -
1314                                   AV1_REF_FRAME_LAST)
1315                         infer(ref_frame_idx[i], current->golden_frame_idx);
1316                     else
1317                         infer(ref_frame_idx[i], -1);
1318                 }
1319             }
1320         }
1321
1322         for (i = 0; i < AV1_REFS_PER_FRAME; i++) {
1323             if (!current->frame_refs_short_signaling)
1324                 fbs(3, ref_frame_idx[i], 1, i);
1325             if (seq->frame_id_numbers_present_flag) {
1326                 fbs(seq->delta_frame_id_length_minus_2 + 2,
1327                     delta_frame_id_minus1[i], 1, i);
1328             }
1329         }
1330
1331         if (current->frame_size_override_flag &&
1332             !current->error_resilient_mode) {
1333             CHECK(FUNC(frame_size_with_refs)(ctx, rw, current));
1334         } else {
1335             CHECK(FUNC(frame_size)(ctx, rw, current));
1336             CHECK(FUNC(render_size)(ctx, rw, current));
1337         }
1338
1339         if (current->force_integer_mv)
1340             infer(allow_high_precision_mv, 0);
1341         else
1342             flag(allow_high_precision_mv);
1343
1344         CHECK(FUNC(interpolation_filter)(ctx, rw, current));
1345
1346         flag(is_motion_mode_switchable);
1347
1348         if (current->error_resilient_mode ||
1349             !seq->enable_ref_frame_mvs)
1350             infer(use_ref_frame_mvs, 0);
1351         else
1352             flag(use_ref_frame_mvs);
1353
1354         infer(allow_intrabc, 0);
1355     }
1356
1357     if (!frame_is_intra) {
1358         // Derive reference frame sign biases.
1359     }
1360
1361     if (seq->reduced_still_picture_header || current->disable_cdf_update)
1362         infer(disable_frame_end_update_cdf, 1);
1363     else
1364         flag(disable_frame_end_update_cdf);
1365
1366     if (current->primary_ref_frame == AV1_PRIMARY_REF_NONE) {
1367         // Init non-coeff CDFs.
1368         // Setup past independence.
1369     } else {
1370         // Load CDF tables from previous frame.
1371         // Load params from previous frame.
1372     }
1373
1374     if (current->use_ref_frame_mvs) {
1375         // Perform motion field estimation process.
1376     }
1377
1378     CHECK(FUNC(tile_info)(ctx, rw, current));
1379
1380     CHECK(FUNC(quantization_params)(ctx, rw, current));
1381
1382     CHECK(FUNC(segmentation_params)(ctx, rw, current));
1383
1384     CHECK(FUNC(delta_q_params)(ctx, rw, current));
1385
1386     CHECK(FUNC(delta_lf_params)(ctx, rw, current));
1387
1388     // Init coeff CDFs / load previous segments.
1389
1390     priv->coded_lossless = 1;
1391     for (i = 0; i < AV1_MAX_SEGMENTS; i++) {
1392         int qindex;
1393         if (current->feature_enabled[i][AV1_SEG_LVL_ALT_Q]) {
1394             qindex = (current->base_q_idx +
1395                       current->feature_value[i][AV1_SEG_LVL_ALT_Q]);
1396         } else {
1397             qindex = current->base_q_idx;
1398         }
1399         qindex = av_clip_uintp2(qindex, 8);
1400
1401         if (qindex                || current->delta_q_y_dc ||
1402             current->delta_q_u_ac || current->delta_q_u_dc ||
1403             current->delta_q_v_ac || current->delta_q_v_dc) {
1404             priv->coded_lossless = 0;
1405         }
1406     }
1407     priv->all_lossless = priv->coded_lossless &&
1408         priv->frame_width == priv->upscaled_width;
1409
1410     CHECK(FUNC(loop_filter_params)(ctx, rw, current));
1411
1412     CHECK(FUNC(cdef_params)(ctx, rw, current));
1413
1414     CHECK(FUNC(lr_params)(ctx, rw, current));
1415
1416     CHECK(FUNC(read_tx_mode)(ctx, rw, current));
1417
1418     CHECK(FUNC(frame_reference_mode)(ctx, rw, current));
1419
1420     CHECK(FUNC(skip_mode_params)(ctx, rw, current));
1421
1422     if (frame_is_intra || current->error_resilient_mode ||
1423         !seq->enable_warped_motion)
1424         infer(allow_warped_motion, 0);
1425     else
1426         flag(allow_warped_motion);
1427
1428     flag(reduced_tx_set);
1429
1430     CHECK(FUNC(global_motion_params)(ctx, rw, current));
1431
1432     CHECK(FUNC(film_grain_params)(ctx, rw, current));
1433
1434     for (i = 0; i < AV1_NUM_REF_FRAMES; i++) {
1435         if (current->refresh_frame_flags & (1 << i)) {
1436             priv->ref[i] = (AV1ReferenceFrameState) {
1437                 .valid          = 1,
1438                 .frame_id       = current->current_frame_id,
1439                 .upscaled_width = priv->upscaled_width,
1440                 .frame_width    = priv->frame_width,
1441                 .frame_height   = priv->frame_height,
1442                 .render_width   = priv->render_width,
1443                 .render_height  = priv->render_height,
1444                 .frame_type     = current->frame_type,
1445                 .subsampling_x  = seq->color_config.subsampling_x,
1446                 .subsampling_y  = seq->color_config.subsampling_y,
1447                 .bit_depth      = priv->bit_depth,
1448                 .order_hint     = current->order_hint,
1449             };
1450         }
1451     }
1452
1453     av_log(ctx->log_ctx, AV_LOG_DEBUG, "Frame %d:  size %dx%d  "
1454            "upscaled %d  render %dx%d  subsample %dx%d  "
1455            "bitdepth %d  tiles %dx%d.\n", current->order_hint,
1456            priv->frame_width, priv->frame_height, priv->upscaled_width,
1457            priv->render_width, priv->render_height,
1458            seq->color_config.subsampling_x + 1,
1459            seq->color_config.subsampling_y + 1, priv->bit_depth,
1460            priv->tile_rows, priv->tile_cols);
1461
1462     return 0;
1463 }
1464
1465 static int FUNC(frame_header_obu)(CodedBitstreamContext *ctx, RWContext *rw,
1466                                   AV1RawFrameHeader *current, int redundant,
1467                                   AVBufferRef *rw_buffer_ref)
1468 {
1469     CodedBitstreamAV1Context *priv = ctx->priv_data;
1470     int start_pos, fh_bits, fh_bytes, err;
1471     uint8_t *fh_start;
1472
1473     if (priv->seen_frame_header) {
1474         if (!redundant) {
1475             av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid repeated "
1476                    "frame header OBU.\n");
1477             return AVERROR_INVALIDDATA;
1478         } else {
1479             GetBitContext fh;
1480             size_t i, b;
1481             uint32_t val;
1482
1483             HEADER("Redundant Frame Header");
1484
1485             av_assert0(priv->frame_header_ref && priv->frame_header);
1486
1487             init_get_bits(&fh, priv->frame_header,
1488                           priv->frame_header_size);
1489             for (i = 0; i < priv->frame_header_size; i += 8) {
1490                 b = FFMIN(priv->frame_header_size - i, 8);
1491                 val = get_bits(&fh, b);
1492                 xf(b, frame_header_copy[i],
1493                    val, val, val, 1, i / 8);
1494             }
1495         }
1496     } else {
1497         if (redundant)
1498             HEADER("Redundant Frame Header (used as Frame Header)");
1499         else
1500             HEADER("Frame Header");
1501
1502         priv->seen_frame_header = 1;
1503
1504 #ifdef READ
1505         start_pos = get_bits_count(rw);
1506 #else
1507         start_pos = put_bits_count(rw);
1508 #endif
1509
1510         CHECK(FUNC(uncompressed_header)(ctx, rw, current));
1511
1512         if (current->show_existing_frame) {
1513             priv->seen_frame_header = 0;
1514         } else {
1515             priv->seen_frame_header = 1;
1516
1517             av_buffer_unref(&priv->frame_header_ref);
1518
1519 #ifdef READ
1520             fh_bits  = get_bits_count(rw) - start_pos;
1521             fh_start = (uint8_t*)rw->buffer + start_pos / 8;
1522 #else
1523             // Need to flush the bitwriter so that we can copy its output,
1524             // but use a copy so we don't affect the caller's structure.
1525             {
1526                 PutBitContext tmp = *rw;
1527                 flush_put_bits(&tmp);
1528             }
1529
1530             fh_bits  = put_bits_count(rw) - start_pos;
1531             fh_start = rw->buf + start_pos / 8;
1532 #endif
1533             fh_bytes = (fh_bits + 7) / 8;
1534
1535             priv->frame_header_size = fh_bits;
1536
1537             if (rw_buffer_ref) {
1538                 priv->frame_header_ref = av_buffer_ref(rw_buffer_ref);
1539                 if (!priv->frame_header_ref)
1540                     return AVERROR(ENOMEM);
1541                 priv->frame_header = fh_start;
1542             } else {
1543                 priv->frame_header_ref =
1544                     av_buffer_alloc(fh_bytes + AV_INPUT_BUFFER_PADDING_SIZE);
1545                 if (!priv->frame_header_ref)
1546                     return AVERROR(ENOMEM);
1547                 priv->frame_header = priv->frame_header_ref->data;
1548                 memcpy(priv->frame_header, fh_start, fh_bytes);
1549             }
1550         }
1551     }
1552
1553     return 0;
1554 }
1555
1556 static int FUNC(tile_group_obu)(CodedBitstreamContext *ctx, RWContext *rw,
1557                                 AV1RawTileGroup *current)
1558 {
1559     CodedBitstreamAV1Context *priv = ctx->priv_data;
1560     int num_tiles, tile_bits;
1561     int err;
1562
1563     HEADER("Tile Group");
1564
1565     num_tiles = priv->tile_cols * priv->tile_rows;
1566     if (num_tiles > 1)
1567         flag(tile_start_and_end_present_flag);
1568     else
1569         infer(tile_start_and_end_present_flag, 0);
1570
1571     if (num_tiles == 1 || !current->tile_start_and_end_present_flag) {
1572         infer(tg_start, 0);
1573         infer(tg_end, num_tiles - 1);
1574     } else {
1575         tile_bits = cbs_av1_tile_log2(1, priv->tile_cols) +
1576                     cbs_av1_tile_log2(1, priv->tile_rows);
1577         fb(tile_bits, tg_start);
1578         fb(tile_bits, tg_end);
1579     }
1580
1581     CHECK(FUNC(byte_alignment)(ctx, rw));
1582
1583     // Reset header for next frame.
1584     if (current->tg_end == num_tiles - 1)
1585         priv->seen_frame_header = 0;
1586
1587     // Tile data follows.
1588
1589     return 0;
1590 }
1591
1592 static int FUNC(frame_obu)(CodedBitstreamContext *ctx, RWContext *rw,
1593                            AV1RawFrame *current,
1594                            AVBufferRef *rw_buffer_ref)
1595 {
1596     int err;
1597
1598     CHECK(FUNC(frame_header_obu)(ctx, rw, &current->header,
1599                                  0, rw_buffer_ref));
1600
1601     CHECK(FUNC(byte_alignment)(ctx, rw));
1602
1603     CHECK(FUNC(tile_group_obu)(ctx, rw, &current->tile_group));
1604
1605     return 0;
1606 }
1607
1608 static int FUNC(tile_list_obu)(CodedBitstreamContext *ctx, RWContext *rw,
1609                                AV1RawTileList *current)
1610 {
1611     int err;
1612
1613     fb(8, output_frame_width_in_tiles_minus_1);
1614     fb(8, output_frame_height_in_tiles_minus_1);
1615
1616     fb(16, tile_count_minus_1);
1617
1618     // Tile data follows.
1619
1620     return 0;
1621 }
1622
1623 static int FUNC(metadata_hdr_cll)(CodedBitstreamContext *ctx, RWContext *rw,
1624                                   AV1RawMetadataHDRCLL *current)
1625 {
1626     int err;
1627
1628     fb(16, max_cll);
1629     fb(16, max_fall);
1630
1631     return 0;
1632 }
1633
1634 static int FUNC(metadata_hdr_mdcv)(CodedBitstreamContext *ctx, RWContext *rw,
1635                                    AV1RawMetadataHDRMDCV *current)
1636 {
1637     int err, i;
1638
1639     for (i = 0; i < 3; i++) {
1640         fcs(16, primary_chromaticity_x[i], 0, 50000, 1, i);
1641         fcs(16, primary_chromaticity_y[i], 0, 50000, 1, i);
1642     }
1643
1644     fc(16, white_point_chromaticity_x, 0, 50000);
1645     fc(16, white_point_chromaticity_y, 0, 50000);
1646
1647     fc(32, luminance_max, 1, MAX_UINT_BITS(32));
1648     fc(32, luminance_min, 0, current->luminance_max >> 6);
1649
1650     return 0;
1651 }
1652
1653 static int FUNC(metadata_scalability)(CodedBitstreamContext *ctx, RWContext *rw,
1654                                       AV1RawMetadataScalability *current)
1655 {
1656     // TODO: scalability metadata.
1657
1658     return AVERROR_PATCHWELCOME;
1659 }
1660
1661 static int FUNC(metadata_itut_t35)(CodedBitstreamContext *ctx, RWContext *rw,
1662                                    AV1RawMetadataITUTT35 *current)
1663 {
1664     int err;
1665     size_t i;
1666
1667     fb(8, itu_t_t35_country_code);
1668     if (current->itu_t_t35_country_code == 0xff)
1669         fb(8, itu_t_t35_country_code_extension_byte);
1670
1671 #ifdef READ
1672     // The payload runs up to the start of the trailing bits, but there might
1673     // be arbitrarily many trailing zeroes so we need to read through twice.
1674     {
1675         GetBitContext tmp = *rw;
1676         current->payload_size = 0;
1677         for (i = 0; get_bits_left(rw) >= 8; i++) {
1678             if (get_bits(rw, 8))
1679                 current->payload_size = i;
1680         }
1681         *rw = tmp;
1682     }
1683
1684     current->payload_ref = av_buffer_alloc(current->payload_size);
1685     if (!current->payload_ref)
1686         return AVERROR(ENOMEM);
1687     current->payload = current->payload_ref->data;
1688 #endif
1689
1690     for (i = 0; i < current->payload_size; i++)
1691         xf(8, itu_t_t35_payload_bytes[i], current->payload[i],
1692            0x00, 0xff, 1, i);
1693
1694     return 0;
1695 }
1696
1697 static int FUNC(metadata_timecode)(CodedBitstreamContext *ctx, RWContext *rw,
1698                                    AV1RawMetadataTimecode *current)
1699 {
1700     int err;
1701
1702     fb(5, counting_type);
1703     flag(full_timestamp_flag);
1704     flag(discontinuity_flag);
1705     flag(cnt_dropped_flag);
1706     fb(9, n_frames);
1707
1708     if (current->full_timestamp_flag) {
1709         fb(6, seconds_value);
1710         fb(6, minutes_value);
1711         fb(5, hours_value);
1712     } else {
1713         flag(seconds_flag);
1714         if (current->seconds_flag) {
1715             fb(6, seconds_value);
1716             flag(minutes_flag);
1717             if (current->minutes_flag) {
1718                 fb(6, minutes_value);
1719                 flag(hours_flag);
1720                 if (current->hours_flag)
1721                     fb(5, hours_value);
1722             }
1723         }
1724     }
1725
1726     fb(5, time_offset_length);
1727     if (current->time_offset_length > 0)
1728         fb(current->time_offset_length, time_offset_value);
1729
1730     return 0;
1731 }
1732
1733 static int FUNC(metadata_obu)(CodedBitstreamContext *ctx, RWContext *rw,
1734                               AV1RawMetadata *current)
1735 {
1736     int err;
1737
1738     leb128(metadata_type);
1739
1740     switch (current->metadata_type) {
1741     case AV1_METADATA_TYPE_HDR_CLL:
1742         CHECK(FUNC(metadata_hdr_cll)(ctx, rw, &current->metadata.hdr_cll));
1743         break;
1744     case AV1_METADATA_TYPE_HDR_MDCV:
1745         CHECK(FUNC(metadata_hdr_mdcv)(ctx, rw, &current->metadata.hdr_mdcv));
1746         break;
1747     case AV1_METADATA_TYPE_SCALABILITY:
1748         CHECK(FUNC(metadata_scalability)(ctx, rw, &current->metadata.scalability));
1749         break;
1750     case AV1_METADATA_TYPE_ITUT_T35:
1751         CHECK(FUNC(metadata_itut_t35)(ctx, rw, &current->metadata.itut_t35));
1752         break;
1753     case AV1_METADATA_TYPE_TIMECODE:
1754         CHECK(FUNC(metadata_timecode)(ctx, rw, &current->metadata.timecode));
1755         break;
1756     default:
1757         // Unknown metadata type.
1758         return AVERROR_PATCHWELCOME;
1759     }
1760
1761     return 0;
1762 }