aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/hevcdec.h
blob: 94609e46993d18dd55df7ad118a33542cd3de60b (plain) (blame)
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
/*
 * HEVC video decoder
 *
 * Copyright (C) 2012 - 2013 Guillaume Martres
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVCODEC_HEVCDEC_H
#define AVCODEC_HEVCDEC_H

#include <stdatomic.h>

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

#include "avcodec.h"
#include "bswapdsp.h"
#include "cabac.h"
#include "dovi_rpu.h"
#include "get_bits.h"
#include "hevcpred.h"
#include "h2645_parse.h"
#include "hevc.h"
#include "hevc_ps.h"
#include "hevc_sei.h"
#include "hevcdsp.h"
#include "h274.h"
#include "threadframe.h"
#include "videodsp.h"

#define SHIFT_CTB_WPP 2

#define MAX_TB_SIZE 32
#define MAX_QP 51
#define DEFAULT_INTRA_TC_OFFSET 2

#define HEVC_CONTEXTS 199
#define HEVC_STAT_COEFFS 4

#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
#define QPEL_EXTRA_BEFORE 3
#define QPEL_EXTRA_AFTER  4
#define QPEL_EXTRA        7

#define EDGE_EMU_BUFFER_STRIDE 80

/**
 * 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 IS_IDR(s) ((s)->nal_unit_type == HEVC_NAL_IDR_W_RADL || (s)->nal_unit_type == HEVC_NAL_IDR_N_LP)
#define IS_BLA(s) ((s)->nal_unit_type == HEVC_NAL_BLA_W_RADL || (s)->nal_unit_type == HEVC_NAL_BLA_W_LP || \
                   (s)->nal_unit_type == HEVC_NAL_BLA_N_LP)
#define IS_IRAP(s) ((s)->nal_unit_type >= HEVC_NAL_BLA_W_LP && (s)->nal_unit_type <= HEVC_NAL_RSV_IRAP_VCL23)

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

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,
    EXPLICIT_RDPCM_FLAG,
    EXPLICIT_RDPCM_DIR_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,
    LOG2_RES_SCALE_ABS,
    RES_SCALE_SIGN_FLAG,
    CU_CHROMA_QP_OFFSET_FLAG,
    CU_CHROMA_QP_OFFSET_IDX,
};

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 PredFlag {
    PF_INTRA = 0,
    PF_L0,
    PF_L1,
    PF_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,
    SAO_APPLIED
};

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 HEVCCABACState {
    uint8_t state[HEVC_CONTEXTS];
    uint8_t stat_coeff[HEVC_STAT_COEFFS];
} HEVCCABACState;

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

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

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

typedef struct SliceHeader {
    unsigned 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 HEVCSliceType 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
    int short_term_ref_pic_set_sps_flag;
    int short_term_ref_pic_set_size;
    ShortTermRPS slice_rps;
    const ShortTermRPS *short_term_rps;
    int long_term_ref_pic_set_size;
    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 slice_act_y_qp_offset;
    int slice_act_cb_qp_offset;
    int slice_act_cr_qp_offset;

    uint8_t cu_chroma_qp_offset_enabled_flag;

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

    uint8_t max_num_merge_cand; ///< 5 - 5_minus_max_num_merge_cand
    uint8_t use_integer_mv_flag;

    unsigned *entry_point_offset;
    int * offset;
    int * size;
    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 CodingUnit {
    int x;
    int y;

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

    // 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 {
    DECLARE_ALIGNED(4, Mv, mv)[2];
    int8_t ref_idx[2];
    int8_t pred_flag;
} 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[4];
    uint8_t chroma_mode_c[4];
} PredictionUnit;

typedef struct TransformUnit {
    int cu_qp_delta;

    int res_scale_val;

    // Inferred parameters;
    int intra_pred_mode;
    int intra_pred_mode_c;
    int chroma_mode_c;
    uint8_t is_cu_qp_delta_coded;
    uint8_t is_cu_chroma_qp_offset_coded;
    int8_t  cu_qp_offset_cb;
    int8_t  cu_qp_offset_cr;
    uint8_t cross_pf;
} TransformUnit;

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)
#define HEVC_FRAME_FLAG_BUMPING   (1 << 3)

#define HEVC_SEQUENCE_COUNTER_MASK 0xff
#define HEVC_SEQUENCE_COUNTER_INVALID (HEVC_SEQUENCE_COUNTER_MASK + 1)

typedef struct HEVCFrame {
    AVFrame *frame;
    AVFrame *frame_grain;
    ThreadFrame tf;
    int needs_fg; /* 1 if grain needs to be applied by the decoder */
    MvField *tab_mvf;
    RefPicList *refPicList;
    RefPicListTab **rpl_tab;
    int ctb_count;
    int poc;
    struct HEVCFrame *collocated_ref;

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

    AVBufferRef *hwaccel_priv_buf;
    void *hwaccel_picture_private;

    /**
     * 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 HEVCLocalContext {
    uint8_t cabac_state[HEVC_CONTEXTS];

    uint8_t stat_coeff[HEVC_STAT_COEFFS];

    uint8_t first_qp_group;

    void *logctx;
    const struct HEVCContext *parent;

    GetBitContext gb;
    CABACContext cc;

    /**
     * This is a pointer to the common CABAC state.
     * In case entropy_coding_sync_enabled_flag is set,
     * the CABAC state after decoding the second CTU in a row is
     * stored here and used to initialize the CABAC state before
     * decoding the first CTU in the next row.
     * This is the basis for WPP and in case slice-threading is used,
     * the next row is decoded by another thread making this state
     * shared between threads.
     */
    HEVCCABACState *common_cabac_state;

    int8_t qp_y;
    int8_t curr_qp_y;

    int qPy_pred;

    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     end_of_tiles_x;
    int     end_of_tiles_y;
    /* +7 is for subpixel interpolation, *2 for high bit depths */
    DECLARE_ALIGNED(32, uint8_t, edge_emu_buffer)[(MAX_PB_SIZE + 7) * EDGE_EMU_BUFFER_STRIDE * 2];
    /* The extended size between the new edge emu buffer is abused by SAO */
    DECLARE_ALIGNED(32, uint8_t, edge_emu_buffer2)[(MAX_PB_SIZE + 7) * EDGE_EMU_BUFFER_STRIDE * 2];
    DECLARE_ALIGNED(32, int16_t, tmp)[MAX_PB_SIZE * MAX_PB_SIZE];

    int ct_depth;
    CodingUnit cu;
    PredictionUnit pu;
    NeighbourAvailable na;

#define BOUNDARY_LEFT_SLICE     (1 << 0)
#define BOUNDARY_LEFT_TILE      (1 << 1)
#define BOUNDARY_UPPER_SLICE    (1 << 2)
#define BOUNDARY_UPPER_TILE     (1 << 3)
    /* properties of the boundary of the current CTB for the purposes
     * of the deblocking filter */
    int boundary_flags;
} HEVCLocalContext;

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

    HEVCLocalContext    **HEVClcList;
    HEVCLocalContext    *HEVClc;

    uint8_t             threads_type;
    uint8_t             threads_number;

    int                 width;
    int                 height;

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

    AVFrame *frame;
    AVFrame *output_frame;
    uint8_t *sao_pixel_buffer_h[3];
    uint8_t *sao_pixel_buffer_v[3];

    HEVCParamSets ps;
    HEVCSEI sei;
    struct AVMD5 *md5_ctx;

    AVBufferPool *tab_mvf_pool;
    AVBufferPool *rpl_tab_pool;

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

    SliceHeader sh;
    SAOParams *sao;
    DBParams *deblock;
    enum HEVCNALUnitType 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 last_eos;  ///< last packet contains an EOS/EOB NAL
    int max_ra;
    int bs_width;
    int bs_height;
    int overlap;

    int is_decoded;
    int no_rasl_output_flag;

    HEVCPredContext hpc;
    HEVCDSPContext hevcdsp;
    VideoDSPContext vdsp;
    BswapDSPContext bdsp;
    H274FilmGrainDatabase h274db;
    int8_t *qp_y_tab;
    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;

    /** The target for the common_cabac_state of the local contexts. */
    HEVCCABACState cabac;

    int enable_parallel_tiles;
    atomic_int wpp_err;

    const uint8_t *data;

    H2645Packet pkt;
    // type of the first VCL NAL of the current frame
    enum HEVCNALUnitType first_nal_type;

    int 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;

    AVBufferRef *rpu_buf;       ///< 0 or 1 Dolby Vision RPUs.
    DOVIContext dovi_ctx;       ///< Dolby Vision decoding context
} HEVCContext;

/**
 * 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);

const RefPicList *ff_hevc_get_ref_list(const HEVCContext *s, const 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(HEVCLocalContext *lc, int ctb_addr_ts);
int ff_hevc_cabac_init(HEVCLocalContext *lc, int ctb_addr_ts);
int ff_hevc_sao_merge_flag_decode(HEVCLocalContext *lc);
int ff_hevc_sao_type_idx_decode(HEVCLocalContext *lc);
int ff_hevc_sao_band_position_decode(HEVCLocalContext *lc);
int ff_hevc_sao_offset_abs_decode(HEVCLocalContext *lc);
int ff_hevc_sao_offset_sign_decode(HEVCLocalContext *lc);
int ff_hevc_sao_eo_class_decode(HEVCLocalContext *lc);
int ff_hevc_end_of_slice_flag_decode(HEVCLocalContext *lc);
int ff_hevc_cu_transquant_bypass_flag_decode(HEVCLocalContext *lc);
int ff_hevc_skip_flag_decode(HEVCLocalContext *lc, int x0, int y0,
                             int x_cb, int y_cb);
int ff_hevc_pred_mode_decode(HEVCLocalContext *lc);
int ff_hevc_split_coding_unit_flag_decode(HEVCLocalContext *lc, int ct_depth,
                                          int x0, int y0);
int ff_hevc_part_mode_decode(HEVCLocalContext *lc, int log2_cb_size);
int ff_hevc_pcm_flag_decode(HEVCLocalContext *lc);
int ff_hevc_prev_intra_luma_pred_flag_decode(HEVCLocalContext *lc);
int ff_hevc_mpm_idx_decode(HEVCLocalContext *lc);
int ff_hevc_rem_intra_luma_pred_mode_decode(HEVCLocalContext *lc);
int ff_hevc_intra_chroma_pred_mode_decode(HEVCLocalContext *lc);
int ff_hevc_merge_idx_decode(HEVCLocalContext *lc);
int ff_hevc_merge_flag_decode(HEVCLocalContext *lc);
int ff_hevc_inter_pred_idc_decode(HEVCLocalContext *lc, int nPbW, int nPbH);
int ff_hevc_ref_idx_lx_decode(HEVCLocalContext *lc, int num_ref_idx_lx);
int ff_hevc_mvp_lx_flag_decode(HEVCLocalContext *lc);
int ff_hevc_no_residual_syntax_flag_decode(HEVCLocalContext *lc);
int ff_hevc_split_transform_flag_decode(HEVCLocalContext *lc, int log2_trafo_size);
int ff_hevc_cbf_cb_cr_decode(HEVCLocalContext *lc, int trafo_depth);
int ff_hevc_cbf_luma_decode(HEVCLocalContext *lc, int trafo_depth);
int ff_hevc_log2_res_scale_abs(HEVCLocalContext *lc, int idx);
int ff_hevc_res_scale_sign_flag(HEVCLocalContext *lc, int idx);

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

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

static av_always_inline int ff_hevc_nal_is_nonref(enum HEVCNALUnitType type)
{
    switch (type) {
    case HEVC_NAL_TRAIL_N:
    case HEVC_NAL_TSA_N:
    case HEVC_NAL_STSA_N:
    case HEVC_NAL_RADL_N:
    case HEVC_NAL_RASL_N:
    case HEVC_NAL_VCL_N10:
    case HEVC_NAL_VCL_N12:
    case HEVC_NAL_VCL_N14:
        return 1;
    default: break;
    }
    return 0;
}

/**
 * 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_bump_frame(HEVCContext *s);

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

void ff_hevc_set_neighbour_available(HEVCLocalContext *lc, int x0, int y0,
                                     int nPbW, int nPbH);
void ff_hevc_luma_mv_merge_mode(HEVCLocalContext *lc, 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(HEVCLocalContext *lc, 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_hls_filter(HEVCLocalContext *lc, int x, int y, int ctb_size);
void ff_hevc_hls_filters(HEVCLocalContext *lc, int x_ctb, int y_ctb, int ctb_size);
void ff_hevc_set_qPy(HEVCLocalContext *lc, int xBase, int yBase,
                     int log2_cb_size);
void ff_hevc_deblocking_boundary_strengths(HEVCLocalContext *lc, int x0, int y0,
                                           int log2_trafo_size);
int ff_hevc_cu_qp_delta_sign_flag(HEVCLocalContext *lc);
int ff_hevc_cu_qp_delta_abs(HEVCLocalContext *lc);
int ff_hevc_cu_chroma_qp_offset_flag(HEVCLocalContext *lc);
int ff_hevc_cu_chroma_qp_offset_idx(HEVCLocalContext *lc);
void ff_hevc_hls_residual_coding(HEVCLocalContext *lc, int x0, int y0,
                                 int log2_trafo_size, enum ScanType scan_idx,
                                 int c_idx);

void ff_hevc_hls_mvd_coding(HEVCLocalContext *lc, int x0, int y0, int log2_cb_size);

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];

#endif /* AVCODEC_HEVCDEC_H */