summaryrefslogtreecommitdiff
path: root/libavcodec/hevc.h
blob: ab95035ddadbb5783fbd2cdae65f203ed4e03b1a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
/*
 * HEVC video decoder
 *
 * Copyright (C) 2012 - 2013 Guillaume Martres
 *
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Libav is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVCODEC_HEVC_H
#define AVCODEC_HEVC_H

#include <stddef.h>
#include <stdint.h>

#include "libavutil/buffer.h"
#include "libavutil/md5.h"

#include "avcodec.h"
#include "cabac.h"
#include "dsputil.h"
#include "get_bits.h"
#include "internal.h"
#include "thread.h"
#include "videodsp.h"

#define MAX_DPB_SIZE 16 // A.4.1
#define MAX_REFS 16

/**
 * 7.4.2.1
 */
#define MAX_SUB_LAYERS 7
#define MAX_VPS_COUNT 16
#define MAX_SPS_COUNT 32
#define MAX_PPS_COUNT 256
#define MAX_SHORT_TERM_RPS_COUNT 64
#define MAX_CU_SIZE 128

//TODO: check if this is really the maximum
#define MAX_TRANSFORM_DEPTH 5

#define MAX_TB_SIZE 32
#define MAX_PB_SIZE 64
#define MAX_LOG2_CTB_SIZE 6
#define MAX_QP 51
#define DEFAULT_INTRA_TC_OFFSET 2

#define HEVC_CONTEXTS 183

#define MRG_MAX_NUM_CANDS     5

#define L0 0
#define L1 1

#define EPEL_EXTRA_BEFORE 1
#define EPEL_EXTRA_AFTER  2
#define EPEL_EXTRA        3

/**
 * Value of the luma sample at position (x, y) in the 2D array tab.
 */
#define SAMPLE(tab, x, y) ((tab)[(y) * s->sps->width + (x)])
#define SAMPLE_CTB(tab, x, y) ((tab)[(y) * min_cb_width + (x)])
#define SAMPLE_CBF(tab, x, y) ((tab)[((y) & ((1<<log2_trafo_size)-1)) * MAX_CU_SIZE + ((x) & ((1<<log2_trafo_size)-1))])

#define IS_IDR(s) (s->nal_unit_type == NAL_IDR_W_RADL || s->nal_unit_type == NAL_IDR_N_LP)
#define IS_BLA(s) (s->nal_unit_type == NAL_BLA_W_RADL || s->nal_unit_type == NAL_BLA_W_LP || \
                   s->nal_unit_type == NAL_BLA_N_LP)
#define IS_IRAP(s) (s->nal_unit_type >= 16 && s->nal_unit_type <= 23)

/**
 * Table 7-3: NAL unit type codes
 */
enum NALUnitType {
    NAL_TRAIL_N    = 0,
    NAL_TRAIL_R    = 1,
    NAL_TSA_N      = 2,
    NAL_TSA_R      = 3,
    NAL_STSA_N     = 4,
    NAL_STSA_R     = 5,
    NAL_RADL_N     = 6,
    NAL_RADL_R     = 7,
    NAL_RASL_N     = 8,
    NAL_RASL_R     = 9,
    NAL_BLA_W_LP   = 16,
    NAL_BLA_W_RADL = 17,
    NAL_BLA_N_LP   = 18,
    NAL_IDR_W_RADL = 19,
    NAL_IDR_N_LP   = 20,
    NAL_CRA_NUT    = 21,
    NAL_VPS        = 32,
    NAL_SPS        = 33,
    NAL_PPS        = 34,
    NAL_AUD        = 35,
    NAL_EOS_NUT    = 36,
    NAL_EOB_NUT    = 37,
    NAL_FD_NUT     = 38,
    NAL_SEI_PREFIX = 39,
    NAL_SEI_SUFFIX = 40,
};

enum RPSType {
    ST_CURR_BEF = 0,
    ST_CURR_AFT,
    ST_FOLL,
    LT_CURR,
    LT_FOLL,
    NB_RPS_TYPE,
};

enum SliceType {
    B_SLICE = 0,
    P_SLICE = 1,
    I_SLICE = 2,
};

enum SyntaxElement {
    SAO_MERGE_FLAG = 0,
    SAO_TYPE_IDX,
    SAO_EO_CLASS,
    SAO_BAND_POSITION,
    SAO_OFFSET_ABS,
    SAO_OFFSET_SIGN,
    END_OF_SLICE_FLAG,
    SPLIT_CODING_UNIT_FLAG,
    CU_TRANSQUANT_BYPASS_FLAG,
    SKIP_FLAG,
    CU_QP_DELTA,
    PRED_MODE_FLAG,
    PART_MODE,
    PCM_FLAG,
    PREV_INTRA_LUMA_PRED_FLAG,
    MPM_IDX,
    REM_INTRA_LUMA_PRED_MODE,
    INTRA_CHROMA_PRED_MODE,
    MERGE_FLAG,
    MERGE_IDX,
    INTER_PRED_IDC,
    REF_IDX_L0,
    REF_IDX_L1,
    ABS_MVD_GREATER0_FLAG,
    ABS_MVD_GREATER1_FLAG,
    ABS_MVD_MINUS2,
    MVD_SIGN_FLAG,
    MVP_LX_FLAG,
    NO_RESIDUAL_DATA_FLAG,
    SPLIT_TRANSFORM_FLAG,
    CBF_LUMA,
    CBF_CB_CR,
    TRANSFORM_SKIP_FLAG,
    LAST_SIGNIFICANT_COEFF_X_PREFIX,
    LAST_SIGNIFICANT_COEFF_Y_PREFIX,
    LAST_SIGNIFICANT_COEFF_X_SUFFIX,
    LAST_SIGNIFICANT_COEFF_Y_SUFFIX,
    SIGNIFICANT_COEFF_GROUP_FLAG,
    SIGNIFICANT_COEFF_FLAG,
    COEFF_ABS_LEVEL_GREATER1_FLAG,
    COEFF_ABS_LEVEL_GREATER2_FLAG,
    COEFF_ABS_LEVEL_REMAINING,
    COEFF_SIGN_FLAG,
};

enum PartMode {
    PART_2Nx2N = 0,
    PART_2NxN  = 1,
    PART_Nx2N  = 2,
    PART_NxN   = 3,
    PART_2NxnU = 4,
    PART_2NxnD = 5,
    PART_nLx2N = 6,
    PART_nRx2N = 7,
};

enum PredMode {
    MODE_INTER = 0,
    MODE_INTRA,
    MODE_SKIP,
};

enum InterPredIdc {
    PRED_L0 = 0,
    PRED_L1,
    PRED_BI,
};

enum IntraPredMode {
    INTRA_PLANAR = 0,
    INTRA_DC,
    INTRA_ANGULAR_2,
    INTRA_ANGULAR_3,
    INTRA_ANGULAR_4,
    INTRA_ANGULAR_5,
    INTRA_ANGULAR_6,
    INTRA_ANGULAR_7,
    INTRA_ANGULAR_8,
    INTRA_ANGULAR_9,
    INTRA_ANGULAR_10,
    INTRA_ANGULAR_11,
    INTRA_ANGULAR_12,
    INTRA_ANGULAR_13,
    INTRA_ANGULAR_14,
    INTRA_ANGULAR_15,
    INTRA_ANGULAR_16,
    INTRA_ANGULAR_17,
    INTRA_ANGULAR_18,
    INTRA_ANGULAR_19,
    INTRA_ANGULAR_20,
    INTRA_ANGULAR_21,
    INTRA_ANGULAR_22,
    INTRA_ANGULAR_23,
    INTRA_ANGULAR_24,
    INTRA_ANGULAR_25,
    INTRA_ANGULAR_26,
    INTRA_ANGULAR_27,
    INTRA_ANGULAR_28,
    INTRA_ANGULAR_29,
    INTRA_ANGULAR_30,
    INTRA_ANGULAR_31,
    INTRA_ANGULAR_32,
    INTRA_ANGULAR_33,
    INTRA_ANGULAR_34,
};

enum SAOType {
    SAO_NOT_APPLIED = 0,
    SAO_BAND,
    SAO_EDGE,
};

enum SAOEOClass {
    SAO_EO_HORIZ = 0,
    SAO_EO_VERT,
    SAO_EO_135D,
    SAO_EO_45D,
};

enum ScanType {
    SCAN_DIAG = 0,
    SCAN_HORIZ,
    SCAN_VERT,
};

typedef struct ShortTermRPS {
    int num_negative_pics;
    int num_delta_pocs;
    int32_t delta_poc[32];
    uint8_t used[32];
} ShortTermRPS;

typedef struct LongTermRPS {
    int     poc[32];
    uint8_t used[32];
    uint8_t nb_refs;
} LongTermRPS;

typedef struct RefPicList {
    struct HEVCFrame *ref[MAX_REFS];
    int list[MAX_REFS];
    int isLongTerm[MAX_REFS];
    int nb_refs;
} RefPicList;

typedef struct RefPicListTab {
    RefPicList refPicList[2];
} RefPicListTab;

typedef struct HEVCWindow {
    int left_offset;
    int right_offset;
    int top_offset;
    int bottom_offset;
} HEVCWindow;

typedef struct VUI {
    AVRational sar;

    int overscan_info_present_flag;
    int overscan_appropriate_flag;

    int video_signal_type_present_flag;
    int video_format;
    int video_full_range_flag;
    int colour_description_present_flag;
    uint8_t colour_primaries;
    uint8_t transfer_characteristic;
    uint8_t matrix_coeffs;

    int chroma_loc_info_present_flag;
    int chroma_sample_loc_type_top_field;
    int chroma_sample_loc_type_bottom_field;
    int neutra_chroma_indication_flag;

    int field_seq_flag;
    int frame_field_info_present_flag;

    int default_display_window_flag;
    HEVCWindow def_disp_win;

    int vui_timing_info_present_flag;
    uint32_t vui_num_units_in_tick;
    uint32_t vui_time_scale;
    int vui_poc_proportional_to_timing_flag;
    int vui_num_ticks_poc_diff_one_minus1;
    int vui_hrd_parameters_present_flag;

    int bitstream_restriction_flag;
    int tiles_fixed_structure_flag;
    int motion_vectors_over_pic_boundaries_flag;
    int restricted_ref_pic_lists_flag;
    int min_spatial_segmentation_idc;
    int max_bytes_per_pic_denom;
    int max_bits_per_min_cu_denom;
    int log2_max_mv_length_horizontal;
    int log2_max_mv_length_vertical;
} VUI;

typedef struct PTL {
    int general_profile_space;
    uint8_t general_tier_flag;
    int general_profile_idc;
    int general_profile_compatibility_flag[32];
    int general_level_idc;

    uint8_t sub_layer_profile_present_flag[MAX_SUB_LAYERS];
    uint8_t sub_layer_level_present_flag[MAX_SUB_LAYERS];

    int sub_layer_profile_space[MAX_SUB_LAYERS];
    uint8_t sub_layer_tier_flag[MAX_SUB_LAYERS];
    int sub_layer_profile_idc[MAX_SUB_LAYERS];
    uint8_t sub_layer_profile_compatibility_flags[MAX_SUB_LAYERS][32];
    int sub_layer_level_idc[MAX_SUB_LAYERS];
} PTL;

typedef struct HEVCVPS {
    uint8_t vps_temporal_id_nesting_flag;
    int vps_max_layers;
    int vps_max_sub_layers; ///< vps_max_temporal_layers_minus1 + 1

    PTL ptl;
    int vps_sub_layer_ordering_info_present_flag;
    unsigned int vps_max_dec_pic_buffering[MAX_SUB_LAYERS];
    unsigned int vps_num_reorder_pics[MAX_SUB_LAYERS];
    unsigned int vps_max_latency_increase[MAX_SUB_LAYERS];
    int vps_max_layer_id;
    int vps_num_layer_sets; ///< vps_num_layer_sets_minus1 + 1
    uint8_t vps_timing_info_present_flag;
    uint32_t vps_num_units_in_tick;
    uint32_t vps_time_scale;
    uint8_t vps_poc_proportional_to_timing_flag;
    int vps_num_ticks_poc_diff_one; ///< vps_num_ticks_poc_diff_one_minus1 + 1
    int vps_num_hrd_parameters;
} HEVCVPS;

typedef struct ScalingList {
    /* This is a little wasteful, since sizeID 0 only needs 8 coeffs,
     * and size ID 3 only has 2 arrays, not 6. */
    uint8_t sl[4][6][64];
    uint8_t sl_dc[2][6];
} ScalingList;

typedef struct HEVCSPS {
    int vps_id;
    int chroma_format_idc;
    uint8_t separate_colour_plane_flag;

    ///< output (i.e. cropped) values
    int output_width, output_height;
    HEVCWindow output_window;

    HEVCWindow pic_conf_win;

    int bit_depth;
    int pixel_shift;
    enum AVPixelFormat pix_fmt;

    unsigned int log2_max_poc_lsb;
    int pcm_enabled_flag;

    int max_sub_layers;
    struct {
        int max_dec_pic_buffering;
        int num_reorder_pics;
        int max_latency_increase;
    } temporal_layer[MAX_SUB_LAYERS];

    VUI vui;
    PTL ptl;

    uint8_t scaling_list_enable_flag;
    ScalingList scaling_list;

    unsigned int nb_st_rps;
    ShortTermRPS st_rps[MAX_SHORT_TERM_RPS_COUNT];

    uint8_t amp_enabled_flag;
    uint8_t sao_enabled;

    uint8_t long_term_ref_pics_present_flag;
    uint16_t lt_ref_pic_poc_lsb_sps[32];
    uint8_t used_by_curr_pic_lt_sps_flag[32];
    uint8_t num_long_term_ref_pics_sps;

    struct {
        uint8_t bit_depth;
        unsigned int log2_min_pcm_cb_size;
        unsigned int log2_max_pcm_cb_size;
        uint8_t loop_filter_disable_flag;
    } pcm;
    uint8_t sps_temporal_mvp_enabled_flag;
    uint8_t sps_strong_intra_smoothing_enable_flag;

    unsigned int log2_min_cb_size;
    unsigned int log2_diff_max_min_coding_block_size;
    unsigned int log2_min_tb_size;
    unsigned int log2_max_trafo_size;
    unsigned int log2_ctb_size;
    unsigned int log2_min_pu_size;

    int max_transform_hierarchy_depth_inter;
    int max_transform_hierarchy_depth_intra;

    ///< coded frame dimension in various units
    int width;
    int height;
    int ctb_width;
    int ctb_height;
    int ctb_size;
    int min_cb_width;
    int min_cb_height;
    int min_tb_width;
    int min_tb_height;
    int min_pu_width;
    int min_pu_height;

    int hshift[3];
    int vshift[3];

    int qp_bd_offset;
} HEVCSPS;

typedef struct HEVCPPS {
    int sps_id; ///< seq_parameter_set_id

    uint8_t sign_data_hiding_flag;

    uint8_t cabac_init_present_flag;

    int num_ref_idx_l0_default_active; ///< num_ref_idx_l0_default_active_minus1 + 1
    int num_ref_idx_l1_default_active; ///< num_ref_idx_l1_default_active_minus1 + 1
    int pic_init_qp_minus26;

    uint8_t constrained_intra_pred_flag;
    uint8_t transform_skip_enabled_flag;

    uint8_t cu_qp_delta_enabled_flag;
    int diff_cu_qp_delta_depth;

    int cb_qp_offset;
    int cr_qp_offset;
    uint8_t pic_slice_level_chroma_qp_offsets_present_flag;
    uint8_t weighted_pred_flag;
    uint8_t weighted_bipred_flag;
    uint8_t output_flag_present_flag;
    uint8_t transquant_bypass_enable_flag;

    uint8_t dependent_slice_segments_enabled_flag;
    uint8_t tiles_enabled_flag;
    uint8_t entropy_coding_sync_enabled_flag;

    int num_tile_columns;   ///< num_tile_columns_minus1 + 1
    int num_tile_rows;      ///< num_tile_rows_minus1 + 1
    uint8_t uniform_spacing_flag;
    uint8_t loop_filter_across_tiles_enabled_flag;

    uint8_t seq_loop_filter_across_slices_enabled_flag;

    uint8_t deblocking_filter_control_present_flag;
    uint8_t deblocking_filter_override_enabled_flag;
    uint8_t disable_dbf;
    int beta_offset;    ///< beta_offset_div2 * 2
    int tc_offset;      ///< tc_offset_div2 * 2

    uint8_t scaling_list_data_present_flag;
    ScalingList scaling_list;

    uint8_t lists_modification_present_flag;
    int log2_parallel_merge_level; ///< log2_parallel_merge_level_minus2 + 2
    int num_extra_slice_header_bits;
    uint8_t slice_header_extension_present_flag;

    // Inferred parameters
    int *column_width;  ///< ColumnWidth
    int *row_height;    ///< RowHeight
    int *col_bd;        ///< ColBd
    int *row_bd;        ///< RowBd
    int *col_idxX;

    int *ctb_addr_rs_to_ts; ///< CtbAddrRSToTS
    int *ctb_addr_ts_to_rs; ///< CtbAddrTSToRS
    int *tile_id;           ///< TileId
    int *tile_pos_rs;       ///< TilePosRS
    int *min_cb_addr_zs;    ///< MinCbAddrZS
    int *min_tb_addr_zs;    ///< MinTbAddrZS
} HEVCPPS;

typedef struct SliceHeader {
    int pps_id;

    ///< address (in raster order) of the first block in the current slice segment
    unsigned int   slice_segment_addr;
    ///< address (in raster order) of the first block in the current slice
    unsigned int   slice_addr;

    enum SliceType slice_type;

    int pic_order_cnt_lsb;

    uint8_t first_slice_in_pic_flag;
    uint8_t dependent_slice_segment_flag;
    uint8_t pic_output_flag;
    uint8_t colour_plane_id;

    ///< RPS coded in the slice header itself is stored here
    ShortTermRPS slice_rps;
    const ShortTermRPS *short_term_rps;
    LongTermRPS long_term_rps;
    unsigned int list_entry_lx[2][32];

    uint8_t rpl_modification_flag[2];
    uint8_t no_output_of_prior_pics_flag;
    uint8_t slice_temporal_mvp_enabled_flag;

    unsigned int nb_refs[2];

    uint8_t slice_sample_adaptive_offset_flag[3];
    uint8_t mvd_l1_zero_flag;

    uint8_t cabac_init_flag;
    uint8_t disable_deblocking_filter_flag; ///< slice_header_disable_deblocking_filter_flag
    uint8_t slice_loop_filter_across_slices_enabled_flag;
    uint8_t collocated_list;

    unsigned int collocated_ref_idx;

    int slice_qp_delta;
    int slice_cb_qp_offset;
    int slice_cr_qp_offset;

    int beta_offset;    ///< beta_offset_div2 * 2
    int tc_offset;      ///< tc_offset_div2 * 2

    unsigned int max_num_merge_cand; ///< 5 - 5_minus_max_num_merge_cand

    int num_entry_point_offsets;

    int8_t slice_qp;

    uint8_t luma_log2_weight_denom;
    int16_t chroma_log2_weight_denom;

    int16_t luma_weight_l0[16];
    int16_t chroma_weight_l0[16][2];
    int16_t chroma_weight_l1[16][2];
    int16_t luma_weight_l1[16];

    int16_t luma_offset_l0[16];
    int16_t chroma_offset_l0[16][2];

    int16_t luma_offset_l1[16];
    int16_t chroma_offset_l1[16][2];

    int slice_ctb_addr_rs;
} SliceHeader;

typedef struct CodingTree {
    int depth; ///< ctDepth
} CodingTree;

typedef struct CodingUnit {
    int x;
    int y;

    enum PredMode pred_mode;    ///< PredMode
    enum PartMode part_mode;    ///< PartMode

    uint8_t rqt_root_cbf;

    uint8_t pcm_flag;

    // Inferred parameters
    uint8_t intra_split_flag;   ///< IntraSplitFlag
    uint8_t max_trafo_depth;    ///< MaxTrafoDepth
    uint8_t cu_transquant_bypass_flag;
} CodingUnit;

typedef struct Mv {
    int16_t x;  ///< horizontal component of motion vector
    int16_t y;  ///< vertical component of motion vector
} Mv;

typedef struct MvField {
    Mv mv[2];
    int8_t ref_idx[2];
    int8_t pred_flag[2];
    uint8_t is_intra;
} MvField;

typedef struct NeighbourAvailable {
    int cand_bottom_left;
    int cand_left;
    int cand_up;
    int cand_up_left;
    int cand_up_right;
    int cand_up_right_sap;
} NeighbourAvailable;

typedef struct PredictionUnit {
    int mpm_idx;
    int rem_intra_luma_pred_mode;
    uint8_t intra_pred_mode[4];
    Mv mvd;
    uint8_t merge_flag;
    uint8_t intra_pred_mode_c;
} PredictionUnit;

typedef struct TransformTree {
    uint8_t cbf_cb[MAX_TRANSFORM_DEPTH][MAX_CU_SIZE * MAX_CU_SIZE];
    uint8_t cbf_cr[MAX_TRANSFORM_DEPTH][MAX_CU_SIZE * MAX_CU_SIZE];
    uint8_t cbf_luma;

    // Inferred parameters
    uint8_t inter_split_flag;
} TransformTree;

typedef struct TransformUnit {
    int cu_qp_delta;

    // Inferred parameters;
    int cur_intra_pred_mode;
    uint8_t is_cu_qp_delta_coded;
} TransformUnit;

typedef struct SAOParams {
    int offset_abs[3][4];   ///< sao_offset_abs
    int offset_sign[3][4];  ///< sao_offset_sign

    int band_position[3];   ///< sao_band_position

    int eo_class[3];        ///< sao_eo_class

    int offset_val[3][5];   ///<SaoOffsetVal

    uint8_t type_idx[3];    ///< sao_type_idx
} SAOParams;

typedef struct DBParams {
    int beta_offset;
    int tc_offset;
} DBParams;

#define HEVC_FRAME_FLAG_OUTPUT    (1 << 0)
#define HEVC_FRAME_FLAG_SHORT_REF (1 << 1)
#define HEVC_FRAME_FLAG_LONG_REF  (1 << 2)

typedef struct HEVCFrame {
    AVFrame *frame;
    ThreadFrame tf;
    MvField *tab_mvf;
    RefPicList *refPicList;
    RefPicListTab **rpl_tab;
    int ctb_count;
    int poc;
    struct HEVCFrame *collocated_ref;

    HEVCWindow window;

    AVBufferRef *tab_mvf_buf;
    AVBufferRef *rpl_tab_buf;
    AVBufferRef *rpl_buf;

    /**
     * A sequence counter, so that old frames are output first
     * after a POC reset
     */
    uint16_t sequence;

    /**
     * A combination of HEVC_FRAME_FLAG_*
     */
    uint8_t flags;
} HEVCFrame;

typedef struct HEVCNAL {
    uint8_t *rbsp_buffer;
    int rbsp_buffer_size;

    int size;
    const uint8_t *data;
} HEVCNAL;

typedef struct HEVCDSPContext {
    void (*put_pcm)(uint8_t *dst, ptrdiff_t stride, int size,
                    GetBitContext *gb, int pcm_bit_depth);

    void (*transquant_bypass[4])(uint8_t *dst, int16_t *coeffs,
                                 ptrdiff_t stride);

    void (*transform_skip)(uint8_t *dst, int16_t *coeffs, ptrdiff_t stride);
    void (*transform_4x4_luma_add)(uint8_t *dst, int16_t *coeffs,
                                   ptrdiff_t stride);
    void (*transform_add[4])(uint8_t *dst, int16_t *coeffs, ptrdiff_t stride);

    void (*sao_band_filter[4])(uint8_t *dst, uint8_t *src, ptrdiff_t stride,
                               struct SAOParams *sao, int *borders,
                               int width, int height, int c_idx);
    void (*sao_edge_filter[4])(uint8_t *dst, uint8_t *src, ptrdiff_t stride,
                               struct SAOParams *sao, int *borders, int width,
                               int height, int c_idx, uint8_t vert_edge,
                               uint8_t horiz_edge, uint8_t diag_edge);

    void (*put_hevc_qpel[4][4])(int16_t *dst, ptrdiff_t dststride, uint8_t *src,
                                ptrdiff_t srcstride, int width, int height,
                                int16_t *mcbuffer);
    void (*put_hevc_epel[2][2])(int16_t *dst, ptrdiff_t dststride, uint8_t *src,
                                ptrdiff_t srcstride, int width, int height,
                                int mx, int my, int16_t *mcbuffer);

    void (*put_unweighted_pred)(uint8_t *dst, ptrdiff_t dststride, int16_t *src,
                                ptrdiff_t srcstride, int width, int height);
    void (*put_weighted_pred_avg)(uint8_t *dst, ptrdiff_t dststride,
                                  int16_t *src1, int16_t *src2,
                                  ptrdiff_t srcstride, int width, int height);
    void (*weighted_pred)(uint8_t denom, int16_t wlxFlag, int16_t olxFlag,
                          uint8_t *dst, ptrdiff_t dststride, int16_t *src,
                          ptrdiff_t srcstride, int width, int height);
    void (*weighted_pred_avg)(uint8_t denom, int16_t wl0Flag, int16_t wl1Flag,
                              int16_t ol0Flag, int16_t ol1Flag, uint8_t *dst,
                              ptrdiff_t dststride, int16_t *src1, int16_t *src2,
                              ptrdiff_t srcstride, int width, int height);

    void (*hevc_h_loop_filter_luma)(uint8_t *pix, ptrdiff_t stride,
                                    int *beta, int *tc,
                                    uint8_t *no_p, uint8_t *no_q);
    void (*hevc_v_loop_filter_luma)(uint8_t *pix, ptrdiff_t stride,
                                    int *beta, int *tc,
                                    uint8_t *no_p, uint8_t *no_q);
    void (*hevc_h_loop_filter_chroma)(uint8_t *pix, ptrdiff_t stride,
                                      int *tc, uint8_t *no_p, uint8_t *no_q);
    void (*hevc_v_loop_filter_chroma)(uint8_t *pix, ptrdiff_t stride,
                                      int *tc, uint8_t *no_p, uint8_t *no_q);
    void (*hevc_h_loop_filter_luma_c)(uint8_t *pix, ptrdiff_t stride,
                                      int *beta, int *tc,
                                      uint8_t *no_p, uint8_t *no_q);
    void (*hevc_v_loop_filter_luma_c)(uint8_t *pix, ptrdiff_t stride,
                                      int *beta, int *tc,
                                      uint8_t *no_p, uint8_t *no_q);
    void (*hevc_h_loop_filter_chroma_c)(uint8_t *pix, ptrdiff_t stride,
                                        int *tc, uint8_t *no_p,
                                        uint8_t *no_q);
    void (*hevc_v_loop_filter_chroma_c)(uint8_t *pix, ptrdiff_t stride,
                                        int *tc, uint8_t *no_p,
                                        uint8_t *no_q);
} HEVCDSPContext;

struct HEVCContext;

typedef struct HEVCPredContext {
    void (*intra_pred)(struct HEVCContext *s, int x0, int y0,
                       int log2_size, int c_idx);

    void (*pred_planar[4])(uint8_t *src, const uint8_t *top,
                           const uint8_t *left, ptrdiff_t stride);
    void (*pred_dc)(uint8_t *src, const uint8_t *top, const uint8_t *left,
                    ptrdiff_t stride, int log2_size, int c_idx);
    void (*pred_angular[4])(uint8_t *src, const uint8_t *top,
                            const uint8_t *left, ptrdiff_t stride,
                            int c_idx, int mode);
} HEVCPredContext;

typedef struct HEVCLocalContext {
    DECLARE_ALIGNED(16, int16_t, mc_buffer[(MAX_PB_SIZE + 7) * MAX_PB_SIZE]);
    uint8_t cabac_state[HEVC_CONTEXTS];

    uint8_t first_qp_group;

    GetBitContext gb;
    CABACContext cc;
    TransformTree tt;

    int8_t qp_y;
    int8_t curr_qp_y;

    TransformUnit tu;

    uint8_t ctb_left_flag;
    uint8_t ctb_up_flag;
    uint8_t ctb_up_right_flag;
    uint8_t ctb_up_left_flag;
    int     start_of_tiles_x;
    int     end_of_tiles_x;
    int     end_of_tiles_y;
    uint8_t *edge_emu_buffer;
    int      edge_emu_buffer_size;
    CodingTree ct;
    CodingUnit cu;
    PredictionUnit pu;
    NeighbourAvailable na;

    uint8_t slice_or_tiles_left_boundary;
    uint8_t slice_or_tiles_up_boundary;
} HEVCLocalContext;

typedef struct HEVCContext {
    const AVClass *c;  // needed by private avoptions
    AVCodecContext *avctx;

    HEVCLocalContext HEVClc;

    uint8_t cabac_state[HEVC_CONTEXTS];

    /** 1 if the independent slice segment header was successfully parsed */
    uint8_t slice_initialized;

    AVFrame *frame;
    AVFrame *sao_frame;
    AVFrame *tmp_frame;
    AVFrame *output_frame;

    const HEVCVPS *vps;
    const HEVCSPS *sps;
    const HEVCPPS *pps;
    HEVCVPS     *vps_list[MAX_VPS_COUNT];
    AVBufferRef *sps_list[MAX_SPS_COUNT];
    AVBufferRef *pps_list[MAX_PPS_COUNT];

    AVBufferPool *tab_mvf_pool;
    AVBufferPool *rpl_tab_pool;

    ///< candidate references for the current frame
    RefPicList rps[5];

    SliceHeader sh;
    SAOParams *sao;
    DBParams *deblock;
    enum NALUnitType nal_unit_type;
    int temporal_id;  ///< temporal_id_plus1 - 1
    HEVCFrame *ref;
    HEVCFrame DPB[32];
    int poc;
    int pocTid0;
    int slice_idx; ///< number of the slice being currently decoded
    int eos;       ///< current packet contains an EOS/EOB NAL
    int max_ra;
    int bs_width;
    int bs_height;

    int is_decoded;

    HEVCPredContext hpc;
    HEVCDSPContext hevcdsp;
    VideoDSPContext vdsp;
    DSPContext dsp;
    int8_t *qp_y_tab;
    uint8_t *split_cu_flag;
    uint8_t *horizontal_bs;
    uint8_t *vertical_bs;

    int32_t *tab_slice_address;

    //  CU
    uint8_t *skip_flag;
    uint8_t *tab_ct_depth;
    // PU
    uint8_t *tab_ipm;

    uint8_t *cbf_luma; // cbf_luma of colocated TU
    uint8_t *is_pcm;

    // CTB-level flags affecting loop filter operation
    uint8_t *filter_slice_edges;

    /** used on BE to byteswap the lines for checksumming */
    uint8_t *checksum_buf;
    int      checksum_buf_size;

    /**
     * Sequence counters for decoded and output frames, so that old
     * frames are output first after a POC reset
     */
    uint16_t seq_decode;
    uint16_t seq_output;

    HEVCNAL *nals;
    int nb_nals;
    int nals_allocated;

    // for checking the frame checksums
    struct AVMD5 *md5_ctx;
    uint8_t       md5[3][16];
    uint8_t is_md5;

    uint8_t context_initialized;
    uint8_t is_nalff;       ///< this flag is != 0 if bitstream is encapsulated
                            ///< as a format defined in 14496-15
    int apply_defdispwin;

    int nal_length_size;    ///< Number of bytes used for nal length (1, 2 or 4)
    int nuh_layer_id;
} HEVCContext;

int ff_hevc_decode_short_term_rps(HEVCContext *s, ShortTermRPS *rps,
                                  const HEVCSPS *sps, int is_slice_header);
int ff_hevc_decode_nal_vps(HEVCContext *s);
int ff_hevc_decode_nal_sps(HEVCContext *s);
int ff_hevc_decode_nal_pps(HEVCContext *s);
int ff_hevc_decode_nal_sei(HEVCContext *s);

/**
 * Mark all frames in DPB as unused for reference.
 */
void ff_hevc_clear_refs(HEVCContext *s);

/**
 * Drop all frames currently in DPB.
 */
void ff_hevc_flush_dpb(HEVCContext *s);

/**
 * Compute POC of the current frame and return it.
 */
int ff_hevc_compute_poc(HEVCContext *s, int poc_lsb);

RefPicList *ff_hevc_get_ref_list(HEVCContext *s, HEVCFrame *frame,
                                 int x0, int y0);

/**
 * Construct the reference picture sets for the current frame.
 */
int ff_hevc_frame_rps(HEVCContext *s);

/**
 * Construct the reference picture list(s) for the current slice.
 */
int ff_hevc_slice_rpl(HEVCContext *s);

void ff_hevc_save_states(HEVCContext *s, int ctb_addr_ts);
void ff_hevc_cabac_init(HEVCContext *s, int ctb_addr_ts);
int ff_hevc_sao_merge_flag_decode(HEVCContext *s);
int ff_hevc_sao_type_idx_decode(HEVCContext *s);
int ff_hevc_sao_band_position_decode(HEVCContext *s);
int ff_hevc_sao_offset_abs_decode(HEVCContext *s);
int ff_hevc_sao_offset_sign_decode(HEVCContext *s);
int ff_hevc_sao_eo_class_decode(HEVCContext *s);
int ff_hevc_end_of_slice_flag_decode(HEVCContext *s);
int ff_hevc_cu_transquant_bypass_flag_decode(HEVCContext *s);
int ff_hevc_skip_flag_decode(HEVCContext *s, int x0, int y0,
                             int x_cb, int y_cb);
int ff_hevc_pred_mode_decode(HEVCContext *s);
int ff_hevc_split_coding_unit_flag_decode(HEVCContext *s, int ct_depth,
                                          int x0, int y0);
int ff_hevc_part_mode_decode(HEVCContext *s, int log2_cb_size);
int ff_hevc_pcm_flag_decode(HEVCContext *s);
int ff_hevc_prev_intra_luma_pred_flag_decode(HEVCContext *s);
int ff_hevc_mpm_idx_decode(HEVCContext *s);
int ff_hevc_rem_intra_luma_pred_mode_decode(HEVCContext *s);
int ff_hevc_intra_chroma_pred_mode_decode(HEVCContext *s);
int ff_hevc_merge_idx_decode(HEVCContext *s);
int ff_hevc_merge_flag_decode(HEVCContext *s);
int ff_hevc_inter_pred_idc_decode(HEVCContext *s, int nPbW, int nPbH);
int ff_hevc_ref_idx_lx_decode(HEVCContext *s, int num_ref_idx_lx);
int ff_hevc_mvp_lx_flag_decode(HEVCContext *s);
int ff_hevc_no_residual_syntax_flag_decode(HEVCContext *s);
int ff_hevc_abs_mvd_greater0_flag_decode(HEVCContext *s);
int ff_hevc_abs_mvd_greater1_flag_decode(HEVCContext *s);
int ff_hevc_mvd_decode(HEVCContext *s);
int ff_hevc_mvd_sign_flag_decode(HEVCContext *s);
int ff_hevc_split_transform_flag_decode(HEVCContext *s, int log2_trafo_size);
int ff_hevc_cbf_cb_cr_decode(HEVCContext *s, int trafo_depth);
int ff_hevc_cbf_luma_decode(HEVCContext *s, int trafo_depth);
int ff_hevc_transform_skip_flag_decode(HEVCContext *s, int c_idx);
int ff_hevc_last_significant_coeff_x_prefix_decode(HEVCContext *s, int c_idx,
                                                   int log2_size);
int ff_hevc_last_significant_coeff_y_prefix_decode(HEVCContext *s, int c_idx,
                                                   int log2_size);
int ff_hevc_last_significant_coeff_suffix_decode(HEVCContext *s,
                                                 int last_significant_coeff_prefix);
int ff_hevc_significant_coeff_group_flag_decode(HEVCContext *s, int c_idx,
                                                int ctx_cg);
int ff_hevc_significant_coeff_flag_decode(HEVCContext *s, int c_idx, int x_c,
                                          int y_c, int log2_trafo_size,
                                          int scan_idx, int prev_sig);
int ff_hevc_coeff_abs_level_greater1_flag_decode(HEVCContext *s, int c_idx,
                                                 int ctx_set);
int ff_hevc_coeff_abs_level_greater2_flag_decode(HEVCContext *s, int c_idx,
                                                 int inc);
int ff_hevc_coeff_abs_level_remaining(HEVCContext *s, int base_level,
                                      int rc_rice_param);
int ff_hevc_coeff_sign_flag(HEVCContext *s, uint8_t nb);

/**
 * Get the number of candidate references for the current frame.
 */
int ff_hevc_frame_nb_refs(HEVCContext *s);

int ff_hevc_set_new_ref(HEVCContext *s, AVFrame **frame, int poc);

/**
 * Find next frame in output order and put a reference to it in frame.
 * @return 1 if a frame was output, 0 otherwise
 */
int ff_hevc_output_frame(HEVCContext *s, AVFrame *frame, int flush);

void ff_hevc_unref_frame(HEVCContext *s, HEVCFrame *frame, int flags);

void ff_hevc_set_neighbour_available(HEVCContext *s, int x0, int y0,
                                     int nPbW, int nPbH);
void ff_hevc_luma_mv_merge_mode(HEVCContext *s, int x0, int y0,
                                int nPbW, int nPbH, int log2_cb_size,
                                int part_idx, int merge_idx, MvField *mv);
void ff_hevc_luma_mv_mvp_mode(HEVCContext *s, int x0, int y0,
                              int nPbW, int nPbH, int log2_cb_size,
                              int part_idx, int merge_idx,
                              MvField *mv, int mvp_lx_flag, int LX);
void ff_hevc_set_qPy(HEVCContext *s, int xC, int yC, int xBase, int yBase,
                     int log2_cb_size);
void ff_hevc_deblocking_boundary_strengths(HEVCContext *s, int x0, int y0,
                                           int log2_trafo_size,
                                           int slice_or_tiles_up_boundary,
                                           int slice_or_tiles_left_boundary);
int ff_hevc_cu_qp_delta_sign_flag(HEVCContext *s);
int ff_hevc_cu_qp_delta_abs(HEVCContext *s);
void ff_hevc_hls_filter(HEVCContext *s, int x, int y);
void ff_hevc_hls_filters(HEVCContext *s, int x_ctb, int y_ctb, int ctb_size);

void ff_hevc_pps_free(HEVCPPS **ppps);

void ff_hevc_pred_init(HEVCPredContext *hpc, int bit_depth);

void ff_hevc_dsp_init(HEVCDSPContext *hpc, int bit_depth);

extern const int8_t ff_hevc_epel_filters[7][16];

extern const uint8_t ff_hevc_qpel_extra_before[4];
extern const uint8_t ff_hevc_qpel_extra_after[4];
extern const uint8_t ff_hevc_qpel_extra[4];

extern const uint8_t ff_hevc_diag_scan4x4_x[16];
extern const uint8_t ff_hevc_diag_scan4x4_y[16];
extern const uint8_t ff_hevc_diag_scan8x8_x[64];
extern const uint8_t ff_hevc_diag_scan8x8_y[64];

#endif /* AVCODEC_HEVC_H */