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hevc.h
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1 /*
2  * HEVC video decoder
3  *
4  * Copyright (C) 2012 - 2013 Guillaume Martres
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #ifndef AVCODEC_HEVC_H
24 #define AVCODEC_HEVC_H
25 
26 #include "libavutil/buffer.h"
27 #include "libavutil/md5.h"
28 
29 #include "avcodec.h"
30 #include "bswapdsp.h"
31 #include "cabac.h"
32 #include "get_bits.h"
33 #include "hevcpred.h"
34 #include "hevcdsp.h"
35 #include "internal.h"
36 #include "thread.h"
37 #include "videodsp.h"
38 
39 #define MAX_DPB_SIZE 16 // A.4.1
40 #define MAX_REFS 16
41 
42 #define MAX_NB_THREADS 16
43 #define SHIFT_CTB_WPP 2
44 
45 /**
46  * 7.4.2.1
47  */
48 #define MAX_SUB_LAYERS 7
49 #define MAX_VPS_COUNT 16
50 #define MAX_SPS_COUNT 32
51 #define MAX_PPS_COUNT 256
52 #define MAX_SHORT_TERM_RPS_COUNT 64
53 #define MAX_CU_SIZE 128
54 
55 //TODO: check if this is really the maximum
56 #define MAX_TRANSFORM_DEPTH 5
57 
58 #define MAX_TB_SIZE 32
59 #define MAX_LOG2_CTB_SIZE 6
60 #define MAX_QP 51
61 #define DEFAULT_INTRA_TC_OFFSET 2
62 
63 #define HEVC_CONTEXTS 199
64 
65 #define MRG_MAX_NUM_CANDS 5
66 
67 #define L0 0
68 #define L1 1
69 
70 #define EPEL_EXTRA_BEFORE 1
71 #define EPEL_EXTRA_AFTER 2
72 #define EPEL_EXTRA 3
73 #define QPEL_EXTRA_BEFORE 3
74 #define QPEL_EXTRA_AFTER 4
75 #define QPEL_EXTRA 7
76 
77 #define EDGE_EMU_BUFFER_STRIDE 80
78 
79 /**
80  * Value of the luma sample at position (x, y) in the 2D array tab.
81  */
82 #define SAMPLE(tab, x, y) ((tab)[(y) * s->sps->width + (x)])
83 #define SAMPLE_CTB(tab, x, y) ((tab)[(y) * min_cb_width + (x)])
84 
85 #define IS_IDR(s) ((s)->nal_unit_type == NAL_IDR_W_RADL || (s)->nal_unit_type == NAL_IDR_N_LP)
86 #define IS_BLA(s) ((s)->nal_unit_type == NAL_BLA_W_RADL || (s)->nal_unit_type == NAL_BLA_W_LP || \
87  (s)->nal_unit_type == NAL_BLA_N_LP)
88 #define IS_IRAP(s) ((s)->nal_unit_type >= 16 && (s)->nal_unit_type <= 23)
89 
90 /**
91  * Table 7-3: NAL unit type codes
92  */
93 enum NALUnitType {
94  NAL_TRAIL_N = 0,
95  NAL_TRAIL_R = 1,
96  NAL_TSA_N = 2,
97  NAL_TSA_R = 3,
98  NAL_STSA_N = 4,
99  NAL_STSA_R = 5,
100  NAL_RADL_N = 6,
101  NAL_RADL_R = 7,
102  NAL_RASL_N = 8,
103  NAL_RASL_R = 9,
104  NAL_BLA_W_LP = 16,
105  NAL_BLA_W_RADL = 17,
106  NAL_BLA_N_LP = 18,
107  NAL_IDR_W_RADL = 19,
108  NAL_IDR_N_LP = 20,
109  NAL_CRA_NUT = 21,
110  NAL_VPS = 32,
111  NAL_SPS = 33,
112  NAL_PPS = 34,
113  NAL_AUD = 35,
114  NAL_EOS_NUT = 36,
115  NAL_EOB_NUT = 37,
116  NAL_FD_NUT = 38,
117  NAL_SEI_PREFIX = 39,
118  NAL_SEI_SUFFIX = 40,
119 };
120 
121 enum RPSType {
122  ST_CURR_BEF = 0,
123  ST_CURR_AFT,
124  ST_FOLL,
125  LT_CURR,
126  LT_FOLL,
127  NB_RPS_TYPE,
128 };
129 
130 enum SliceType {
131  B_SLICE = 0,
132  P_SLICE = 1,
133  I_SLICE = 2,
134 };
135 
136 enum SyntaxElement {
137  SAO_MERGE_FLAG = 0,
138  SAO_TYPE_IDX,
139  SAO_EO_CLASS,
140  SAO_BAND_POSITION,
141  SAO_OFFSET_ABS,
142  SAO_OFFSET_SIGN,
143  END_OF_SLICE_FLAG,
144  SPLIT_CODING_UNIT_FLAG,
145  CU_TRANSQUANT_BYPASS_FLAG,
146  SKIP_FLAG,
147  CU_QP_DELTA,
148  PRED_MODE_FLAG,
149  PART_MODE,
150  PCM_FLAG,
151  PREV_INTRA_LUMA_PRED_FLAG,
152  MPM_IDX,
153  REM_INTRA_LUMA_PRED_MODE,
154  INTRA_CHROMA_PRED_MODE,
155  MERGE_FLAG,
156  MERGE_IDX,
157  INTER_PRED_IDC,
158  REF_IDX_L0,
159  REF_IDX_L1,
160  ABS_MVD_GREATER0_FLAG,
161  ABS_MVD_GREATER1_FLAG,
162  ABS_MVD_MINUS2,
163  MVD_SIGN_FLAG,
164  MVP_LX_FLAG,
165  NO_RESIDUAL_DATA_FLAG,
166  SPLIT_TRANSFORM_FLAG,
167  CBF_LUMA,
168  CBF_CB_CR,
169  TRANSFORM_SKIP_FLAG,
170  EXPLICIT_RDPCM_FLAG,
171  EXPLICIT_RDPCM_DIR_FLAG,
172  LAST_SIGNIFICANT_COEFF_X_PREFIX,
173  LAST_SIGNIFICANT_COEFF_Y_PREFIX,
174  LAST_SIGNIFICANT_COEFF_X_SUFFIX,
175  LAST_SIGNIFICANT_COEFF_Y_SUFFIX,
176  SIGNIFICANT_COEFF_GROUP_FLAG,
177  SIGNIFICANT_COEFF_FLAG,
178  COEFF_ABS_LEVEL_GREATER1_FLAG,
179  COEFF_ABS_LEVEL_GREATER2_FLAG,
180  COEFF_ABS_LEVEL_REMAINING,
181  COEFF_SIGN_FLAG,
182  LOG2_RES_SCALE_ABS,
183  RES_SCALE_SIGN_FLAG,
184  CU_CHROMA_QP_OFFSET_FLAG,
185  CU_CHROMA_QP_OFFSET_IDX,
186 };
187 
188 enum PartMode {
189  PART_2Nx2N = 0,
190  PART_2NxN = 1,
191  PART_Nx2N = 2,
192  PART_NxN = 3,
193  PART_2NxnU = 4,
194  PART_2NxnD = 5,
195  PART_nLx2N = 6,
196  PART_nRx2N = 7,
197 };
198 
199 enum PredMode {
200  MODE_INTER = 0,
201  MODE_INTRA,
202  MODE_SKIP,
203 };
204 
205 enum InterPredIdc {
206  PRED_L0 = 0,
207  PRED_L1,
208  PRED_BI,
209 };
210 
211 enum PredFlag {
212  PF_INTRA = 0,
213  PF_L0,
214  PF_L1,
215  PF_BI,
216 };
217 
218 enum IntraPredMode {
219  INTRA_PLANAR = 0,
220  INTRA_DC,
221  INTRA_ANGULAR_2,
222  INTRA_ANGULAR_3,
223  INTRA_ANGULAR_4,
224  INTRA_ANGULAR_5,
225  INTRA_ANGULAR_6,
226  INTRA_ANGULAR_7,
227  INTRA_ANGULAR_8,
228  INTRA_ANGULAR_9,
229  INTRA_ANGULAR_10,
230  INTRA_ANGULAR_11,
231  INTRA_ANGULAR_12,
232  INTRA_ANGULAR_13,
233  INTRA_ANGULAR_14,
234  INTRA_ANGULAR_15,
235  INTRA_ANGULAR_16,
236  INTRA_ANGULAR_17,
237  INTRA_ANGULAR_18,
238  INTRA_ANGULAR_19,
239  INTRA_ANGULAR_20,
240  INTRA_ANGULAR_21,
241  INTRA_ANGULAR_22,
242  INTRA_ANGULAR_23,
243  INTRA_ANGULAR_24,
244  INTRA_ANGULAR_25,
245  INTRA_ANGULAR_26,
246  INTRA_ANGULAR_27,
247  INTRA_ANGULAR_28,
248  INTRA_ANGULAR_29,
249  INTRA_ANGULAR_30,
250  INTRA_ANGULAR_31,
251  INTRA_ANGULAR_32,
252  INTRA_ANGULAR_33,
253  INTRA_ANGULAR_34,
254 };
255 
256 enum SAOType {
257  SAO_NOT_APPLIED = 0,
258  SAO_BAND,
259  SAO_EDGE,
260  SAO_APPLIED
261 };
262 
263 enum SAOEOClass {
264  SAO_EO_HORIZ = 0,
265  SAO_EO_VERT,
266  SAO_EO_135D,
267  SAO_EO_45D,
268 };
269 
270 enum ScanType {
271  SCAN_DIAG = 0,
272  SCAN_HORIZ,
273  SCAN_VERT,
274 };
275 
276 typedef struct ShortTermRPS {
277  unsigned int num_negative_pics;
278  int num_delta_pocs;
279  int32_t delta_poc[32];
280  uint8_t used[32];
281 } ShortTermRPS;
282 
283 typedef struct LongTermRPS {
284  int poc[32];
285  uint8_t used[32];
286  uint8_t nb_refs;
287 } LongTermRPS;
288 
289 typedef struct RefPicList {
290  struct HEVCFrame *ref[MAX_REFS];
291  int list[MAX_REFS];
292  int isLongTerm[MAX_REFS];
293  int nb_refs;
294 } RefPicList;
295 
296 typedef struct RefPicListTab {
297  RefPicList refPicList[2];
298 } RefPicListTab;
299 
300 typedef struct HEVCWindow {
301  int left_offset;
302  int right_offset;
303  int top_offset;
304  int bottom_offset;
305 } HEVCWindow;
306 
307 typedef struct VUI {
308  AVRational sar;
309 
310  int overscan_info_present_flag;
311  int overscan_appropriate_flag;
312 
313  int video_signal_type_present_flag;
314  int video_format;
315  int video_full_range_flag;
316  int colour_description_present_flag;
317  uint8_t colour_primaries;
318  uint8_t transfer_characteristic;
319  uint8_t matrix_coeffs;
320 
321  int chroma_loc_info_present_flag;
322  int chroma_sample_loc_type_top_field;
323  int chroma_sample_loc_type_bottom_field;
324  int neutra_chroma_indication_flag;
325 
326  int field_seq_flag;
327  int frame_field_info_present_flag;
328 
329  int default_display_window_flag;
330  HEVCWindow def_disp_win;
331 
332  int vui_timing_info_present_flag;
333  uint32_t vui_num_units_in_tick;
334  uint32_t vui_time_scale;
335  int vui_poc_proportional_to_timing_flag;
336  int vui_num_ticks_poc_diff_one_minus1;
337  int vui_hrd_parameters_present_flag;
338 
339  int bitstream_restriction_flag;
340  int tiles_fixed_structure_flag;
341  int motion_vectors_over_pic_boundaries_flag;
342  int restricted_ref_pic_lists_flag;
343  int min_spatial_segmentation_idc;
344  int max_bytes_per_pic_denom;
345  int max_bits_per_min_cu_denom;
346  int log2_max_mv_length_horizontal;
347  int log2_max_mv_length_vertical;
348 } VUI;
349 
350 typedef struct PTLCommon {
351  uint8_t profile_space;
352  uint8_t tier_flag;
353  uint8_t profile_idc;
354  uint8_t profile_compatibility_flag[32];
355  uint8_t level_idc;
356  uint8_t progressive_source_flag;
357  uint8_t interlaced_source_flag;
358  uint8_t non_packed_constraint_flag;
359  uint8_t frame_only_constraint_flag;
360 } PTLCommon;
361 
362 typedef struct PTL {
363  PTLCommon general_ptl;
364  PTLCommon sub_layer_ptl[MAX_SUB_LAYERS];
365 
366  uint8_t sub_layer_profile_present_flag[MAX_SUB_LAYERS];
367  uint8_t sub_layer_level_present_flag[MAX_SUB_LAYERS];
368 } PTL;
369 
370 typedef struct HEVCVPS {
371  uint8_t vps_temporal_id_nesting_flag;
372  int vps_max_layers;
373  int vps_max_sub_layers; ///< vps_max_temporal_layers_minus1 + 1
374 
375  PTL ptl;
376  int vps_sub_layer_ordering_info_present_flag;
377  unsigned int vps_max_dec_pic_buffering[MAX_SUB_LAYERS];
378  unsigned int vps_num_reorder_pics[MAX_SUB_LAYERS];
379  unsigned int vps_max_latency_increase[MAX_SUB_LAYERS];
380  int vps_max_layer_id;
381  int vps_num_layer_sets; ///< vps_num_layer_sets_minus1 + 1
382  uint8_t vps_timing_info_present_flag;
383  uint32_t vps_num_units_in_tick;
384  uint32_t vps_time_scale;
385  uint8_t vps_poc_proportional_to_timing_flag;
386  int vps_num_ticks_poc_diff_one; ///< vps_num_ticks_poc_diff_one_minus1 + 1
387  int vps_num_hrd_parameters;
388 } HEVCVPS;
389 
390 typedef struct ScalingList {
391  /* This is a little wasteful, since sizeID 0 only needs 8 coeffs,
392  * and size ID 3 only has 2 arrays, not 6. */
393  uint8_t sl[4][6][64];
394  uint8_t sl_dc[2][6];
395 } ScalingList;
396 
397 typedef struct HEVCSPS {
398  unsigned vps_id;
399  int chroma_format_idc;
400  uint8_t separate_colour_plane_flag;
401 
402  ///< output (i.e. cropped) values
403  int output_width, output_height;
404  HEVCWindow output_window;
405 
406  HEVCWindow pic_conf_win;
407 
408  int bit_depth;
409  int pixel_shift;
410  enum AVPixelFormat pix_fmt;
411 
412  unsigned int log2_max_poc_lsb;
413  int pcm_enabled_flag;
414 
415  int max_sub_layers;
416  struct {
417  int max_dec_pic_buffering;
418  int num_reorder_pics;
419  int max_latency_increase;
420  } temporal_layer[MAX_SUB_LAYERS];
421 
422  VUI vui;
423  PTL ptl;
424 
425  uint8_t scaling_list_enable_flag;
426  ScalingList scaling_list;
427 
428  unsigned int nb_st_rps;
429  ShortTermRPS st_rps[MAX_SHORT_TERM_RPS_COUNT];
430 
431  uint8_t amp_enabled_flag;
432  uint8_t sao_enabled;
433 
434  uint8_t long_term_ref_pics_present_flag;
435  uint16_t lt_ref_pic_poc_lsb_sps[32];
436  uint8_t used_by_curr_pic_lt_sps_flag[32];
437  uint8_t num_long_term_ref_pics_sps;
438 
439  struct {
440  uint8_t bit_depth;
441  uint8_t bit_depth_chroma;
442  unsigned int log2_min_pcm_cb_size;
443  unsigned int log2_max_pcm_cb_size;
444  uint8_t loop_filter_disable_flag;
445  } pcm;
446  uint8_t sps_temporal_mvp_enabled_flag;
447  uint8_t sps_strong_intra_smoothing_enable_flag;
448 
449  unsigned int log2_min_cb_size;
450  unsigned int log2_diff_max_min_coding_block_size;
451  unsigned int log2_min_tb_size;
452  unsigned int log2_max_trafo_size;
453  unsigned int log2_ctb_size;
454  unsigned int log2_min_pu_size;
455 
456  int max_transform_hierarchy_depth_inter;
457  int max_transform_hierarchy_depth_intra;
458 
459  int transform_skip_rotation_enabled_flag;
460  int transform_skip_context_enabled_flag;
461  int implicit_rdpcm_enabled_flag;
462  int explicit_rdpcm_enabled_flag;
463  int intra_smoothing_disabled_flag;
464  int persistent_rice_adaptation_enabled_flag;
465 
466  ///< coded frame dimension in various units
467  int width;
468  int height;
469  int ctb_width;
470  int ctb_height;
471  int ctb_size;
472  int min_cb_width;
473  int min_cb_height;
474  int min_tb_width;
475  int min_tb_height;
476  int min_pu_width;
477  int min_pu_height;
478  int tb_mask;
479 
480  int hshift[3];
481  int vshift[3];
482 
483  int qp_bd_offset;
484 } HEVCSPS;
485 
486 typedef struct HEVCPPS {
487  unsigned int sps_id; ///< seq_parameter_set_id
488 
489  uint8_t sign_data_hiding_flag;
490 
491  uint8_t cabac_init_present_flag;
492 
493  int num_ref_idx_l0_default_active; ///< num_ref_idx_l0_default_active_minus1 + 1
494  int num_ref_idx_l1_default_active; ///< num_ref_idx_l1_default_active_minus1 + 1
495  int pic_init_qp_minus26;
496 
497  uint8_t constrained_intra_pred_flag;
498  uint8_t transform_skip_enabled_flag;
499 
500  uint8_t cu_qp_delta_enabled_flag;
501  int diff_cu_qp_delta_depth;
502 
503  int cb_qp_offset;
504  int cr_qp_offset;
505  uint8_t pic_slice_level_chroma_qp_offsets_present_flag;
506  uint8_t weighted_pred_flag;
507  uint8_t weighted_bipred_flag;
508  uint8_t output_flag_present_flag;
509  uint8_t transquant_bypass_enable_flag;
510 
511  uint8_t dependent_slice_segments_enabled_flag;
512  uint8_t tiles_enabled_flag;
513  uint8_t entropy_coding_sync_enabled_flag;
514 
515  int num_tile_columns; ///< num_tile_columns_minus1 + 1
516  int num_tile_rows; ///< num_tile_rows_minus1 + 1
517  uint8_t uniform_spacing_flag;
518  uint8_t loop_filter_across_tiles_enabled_flag;
519 
520  uint8_t seq_loop_filter_across_slices_enabled_flag;
521 
522  uint8_t deblocking_filter_control_present_flag;
523  uint8_t deblocking_filter_override_enabled_flag;
524  uint8_t disable_dbf;
525  int beta_offset; ///< beta_offset_div2 * 2
526  int tc_offset; ///< tc_offset_div2 * 2
527 
528  uint8_t scaling_list_data_present_flag;
529  ScalingList scaling_list;
530 
531  uint8_t lists_modification_present_flag;
532  int log2_parallel_merge_level; ///< log2_parallel_merge_level_minus2 + 2
533  int num_extra_slice_header_bits;
534  uint8_t slice_header_extension_present_flag;
535  uint8_t log2_max_transform_skip_block_size;
536  uint8_t cross_component_prediction_enabled_flag;
537  uint8_t chroma_qp_offset_list_enabled_flag;
538  uint8_t diff_cu_chroma_qp_offset_depth;
539  uint8_t chroma_qp_offset_list_len_minus1;
540  int8_t cb_qp_offset_list[5];
541  int8_t cr_qp_offset_list[5];
542  uint8_t log2_sao_offset_scale_luma;
543  uint8_t log2_sao_offset_scale_chroma;
544 
545  // Inferred parameters
546  unsigned int *column_width; ///< ColumnWidth
547  unsigned int *row_height; ///< RowHeight
548  unsigned int *col_bd; ///< ColBd
549  unsigned int *row_bd; ///< RowBd
550  int *col_idxX;
551 
552  int *ctb_addr_rs_to_ts; ///< CtbAddrRSToTS
553  int *ctb_addr_ts_to_rs; ///< CtbAddrTSToRS
554  int *tile_id; ///< TileId
555  int *tile_pos_rs; ///< TilePosRS
556  int *min_tb_addr_zs; ///< MinTbAddrZS
557  int *min_tb_addr_zs_tab;///< MinTbAddrZS
558 } HEVCPPS;
559 
560 typedef struct SliceHeader {
561  unsigned int pps_id;
562 
563  ///< address (in raster order) of the first block in the current slice segment
564  unsigned int slice_segment_addr;
565  ///< address (in raster order) of the first block in the current slice
566  unsigned int slice_addr;
567 
568  enum SliceType slice_type;
569 
570  int pic_order_cnt_lsb;
571 
572  uint8_t first_slice_in_pic_flag;
573  uint8_t dependent_slice_segment_flag;
574  uint8_t pic_output_flag;
575  uint8_t colour_plane_id;
576 
577  ///< RPS coded in the slice header itself is stored here
578  ShortTermRPS slice_rps;
579  const ShortTermRPS *short_term_rps;
580  LongTermRPS long_term_rps;
581  unsigned int list_entry_lx[2][32];
582 
583  uint8_t rpl_modification_flag[2];
584  uint8_t no_output_of_prior_pics_flag;
585  uint8_t slice_temporal_mvp_enabled_flag;
586 
587  unsigned int nb_refs[2];
588 
589  uint8_t slice_sample_adaptive_offset_flag[3];
590  uint8_t mvd_l1_zero_flag;
591 
592  uint8_t cabac_init_flag;
593  uint8_t disable_deblocking_filter_flag; ///< slice_header_disable_deblocking_filter_flag
594  uint8_t slice_loop_filter_across_slices_enabled_flag;
595  uint8_t collocated_list;
596 
597  unsigned int collocated_ref_idx;
598 
599  int slice_qp_delta;
600  int slice_cb_qp_offset;
601  int slice_cr_qp_offset;
602 
603  uint8_t cu_chroma_qp_offset_enabled_flag;
604 
605  int beta_offset; ///< beta_offset_div2 * 2
606  int tc_offset; ///< tc_offset_div2 * 2
607 
608  unsigned int max_num_merge_cand; ///< 5 - 5_minus_max_num_merge_cand
609 
610  int *entry_point_offset;
611  int * offset;
612  int * size;
613  int num_entry_point_offsets;
614 
615  int8_t slice_qp;
616 
617  uint8_t luma_log2_weight_denom;
618  int16_t chroma_log2_weight_denom;
619 
620  int16_t luma_weight_l0[16];
621  int16_t chroma_weight_l0[16][2];
622  int16_t chroma_weight_l1[16][2];
623  int16_t luma_weight_l1[16];
624 
625  int16_t luma_offset_l0[16];
626  int16_t chroma_offset_l0[16][2];
627 
628  int16_t luma_offset_l1[16];
629  int16_t chroma_offset_l1[16][2];
630 
631  int slice_ctb_addr_rs;
632 } SliceHeader;
633 
634 typedef struct CodingTree {
635  int depth; ///< ctDepth
636 } CodingTree;
637 
638 typedef struct CodingUnit {
639  int x;
640  int y;
641 
642  enum PredMode pred_mode; ///< PredMode
643  enum PartMode part_mode; ///< PartMode
644 
645  uint8_t rqt_root_cbf;
646 
647  uint8_t pcm_flag;
648 
649  // Inferred parameters
650  uint8_t intra_split_flag; ///< IntraSplitFlag
651  uint8_t max_trafo_depth; ///< MaxTrafoDepth
652  uint8_t cu_transquant_bypass_flag;
653 } CodingUnit;
654 
655 typedef struct Mv {
656  int16_t x; ///< horizontal component of motion vector
657  int16_t y; ///< vertical component of motion vector
658 } Mv;
659 
660 typedef struct MvField {
661  DECLARE_ALIGNED(4, Mv, mv)[2];
662  int8_t ref_idx[2];
663  int8_t pred_flag;
664 } MvField;
665 
666 typedef struct NeighbourAvailable {
667  int cand_bottom_left;
668  int cand_left;
669  int cand_up;
670  int cand_up_left;
671  int cand_up_right;
672  int cand_up_right_sap;
673 } NeighbourAvailable;
674 
675 typedef struct PredictionUnit {
676  int mpm_idx;
677  int rem_intra_luma_pred_mode;
678  uint8_t intra_pred_mode[4];
679  Mv mvd;
680  uint8_t merge_flag;
681  uint8_t intra_pred_mode_c[4];
682  uint8_t chroma_mode_c[4];
683 } PredictionUnit;
684 
685 typedef struct TransformUnit {
686  DECLARE_ALIGNED(32, int16_t, coeffs[2][MAX_TB_SIZE * MAX_TB_SIZE]);
687  int cu_qp_delta;
688 
689  int res_scale_val;
690 
691  // Inferred parameters;
692  int intra_pred_mode;
693  int intra_pred_mode_c;
694  int chroma_mode_c;
695  uint8_t is_cu_qp_delta_coded;
696  uint8_t is_cu_chroma_qp_offset_coded;
697  int8_t cu_qp_offset_cb;
698  int8_t cu_qp_offset_cr;
699  uint8_t cross_pf;
700 } TransformUnit;
701 
702 typedef struct DBParams {
703  int beta_offset;
704  int tc_offset;
705 } DBParams;
706 
707 #define HEVC_FRAME_FLAG_OUTPUT (1 << 0)
708 #define HEVC_FRAME_FLAG_SHORT_REF (1 << 1)
709 #define HEVC_FRAME_FLAG_LONG_REF (1 << 2)
710 #define HEVC_FRAME_FLAG_BUMPING (1 << 3)
711 
712 typedef struct HEVCFrame {
713  AVFrame *frame;
714  ThreadFrame tf;
715  MvField *tab_mvf;
716  RefPicList *refPicList;
717  RefPicListTab **rpl_tab;
718  int ctb_count;
719  int poc;
720  struct HEVCFrame *collocated_ref;
721 
722  HEVCWindow window;
723 
724  AVBufferRef *tab_mvf_buf;
725  AVBufferRef *rpl_tab_buf;
726  AVBufferRef *rpl_buf;
727 
728  /**
729  * A sequence counter, so that old frames are output first
730  * after a POC reset
731  */
732  uint16_t sequence;
733 
734  /**
735  * A combination of HEVC_FRAME_FLAG_*
736  */
737  uint8_t flags;
738 } HEVCFrame;
739 
740 typedef struct HEVCNAL {
741  uint8_t *rbsp_buffer;
742  int rbsp_buffer_size;
743 
744  int size;
745  const uint8_t *data;
746 } HEVCNAL;
747 
748 typedef struct HEVCLocalContext {
749  DECLARE_ALIGNED(16, int16_t, mc_buffer[(MAX_PB_SIZE + 7) * MAX_PB_SIZE]);
750  uint8_t cabac_state[HEVC_CONTEXTS];
751 
752  uint8_t stat_coeff[4];
753 
754  uint8_t first_qp_group;
755 
756  GetBitContext gb;
757  CABACContext cc;
758 
759  int8_t qp_y;
760  int8_t curr_qp_y;
761 
762  int qPy_pred;
763 
764  TransformUnit tu;
765 
766  uint8_t ctb_left_flag;
767  uint8_t ctb_up_flag;
768  uint8_t ctb_up_right_flag;
769  uint8_t ctb_up_left_flag;
770  int end_of_tiles_x;
771  int end_of_tiles_y;
772  /* +7 is for subpixel interpolation, *2 for high bit depths */
773  DECLARE_ALIGNED(32, uint8_t, edge_emu_buffer)[(MAX_PB_SIZE + 7) * EDGE_EMU_BUFFER_STRIDE * 2];
774  DECLARE_ALIGNED(32, uint8_t, edge_emu_buffer2)[(MAX_PB_SIZE + 7) * EDGE_EMU_BUFFER_STRIDE * 2];
775 
776  CodingTree ct;
777  CodingUnit cu;
778  PredictionUnit pu;
779  NeighbourAvailable na;
780 
781 #define BOUNDARY_LEFT_SLICE (1 << 0)
782 #define BOUNDARY_LEFT_TILE (1 << 1)
783 #define BOUNDARY_UPPER_SLICE (1 << 2)
784 #define BOUNDARY_UPPER_TILE (1 << 3)
785  /* properties of the boundary of the current CTB for the purposes
786  * of the deblocking filter */
787  int boundary_flags;
788 } HEVCLocalContext;
789 
790 typedef struct HEVCContext {
791  const AVClass *c; // needed by private avoptions
792  AVCodecContext *avctx;
793 
794  struct HEVCContext *sList[MAX_NB_THREADS];
795 
796  HEVCLocalContext *HEVClcList[MAX_NB_THREADS];
797  HEVCLocalContext *HEVClc;
798 
799  uint8_t threads_type;
800  uint8_t threads_number;
801 
802  int width;
803  int height;
804 
805  uint8_t *cabac_state;
806 
807  /** 1 if the independent slice segment header was successfully parsed */
808  uint8_t slice_initialized;
809 
810  AVFrame *frame;
811  AVFrame *sao_frame;
812  AVFrame *tmp_frame;
813  AVFrame *output_frame;
814 
815  const HEVCVPS *vps;
816  const HEVCSPS *sps;
817  const HEVCPPS *pps;
818  AVBufferRef *vps_list[MAX_VPS_COUNT];
819  AVBufferRef *sps_list[MAX_SPS_COUNT];
820  AVBufferRef *pps_list[MAX_PPS_COUNT];
821 
822  AVBufferRef *current_sps;
823 
824  AVBufferPool *tab_mvf_pool;
825  AVBufferPool *rpl_tab_pool;
826 
827  ///< candidate references for the current frame
828  RefPicList rps[5];
829 
830  SliceHeader sh;
831  SAOParams *sao;
832  DBParams *deblock;
833  enum NALUnitType nal_unit_type;
834  int temporal_id; ///< temporal_id_plus1 - 1
835  HEVCFrame *ref;
836  HEVCFrame DPB[32];
837  int poc;
838  int pocTid0;
839  int slice_idx; ///< number of the slice being currently decoded
840  int eos; ///< current packet contains an EOS/EOB NAL
841  int last_eos; ///< last packet contains an EOS/EOB NAL
842  int max_ra;
843  int bs_width;
844  int bs_height;
845 
846  int is_decoded;
847 
848  HEVCPredContext hpc;
849  HEVCDSPContext hevcdsp;
850  VideoDSPContext vdsp;
851  BswapDSPContext bdsp;
852  int8_t *qp_y_tab;
853  uint8_t *horizontal_bs;
854  uint8_t *vertical_bs;
855 
856  int32_t *tab_slice_address;
857 
858  // CU
859  uint8_t *skip_flag;
860  uint8_t *tab_ct_depth;
861  // PU
862  uint8_t *tab_ipm;
863 
864  uint8_t *cbf_luma; // cbf_luma of colocated TU
865  uint8_t *is_pcm;
866 
867  // CTB-level flags affecting loop filter operation
868  uint8_t *filter_slice_edges;
869 
870  /** used on BE to byteswap the lines for checksumming */
871  uint8_t *checksum_buf;
872  int checksum_buf_size;
873 
874  /**
875  * Sequence counters for decoded and output frames, so that old
876  * frames are output first after a POC reset
877  */
878  uint16_t seq_decode;
879  uint16_t seq_output;
880 
881  int enable_parallel_tiles;
882  int wpp_err;
883  int skipped_bytes;
884  int *skipped_bytes_pos;
885  int skipped_bytes_pos_size;
886 
887  int *skipped_bytes_nal;
888  int **skipped_bytes_pos_nal;
889  int *skipped_bytes_pos_size_nal;
890 
891  const uint8_t *data;
892 
893  HEVCNAL *nals;
894  int nb_nals;
895  int nals_allocated;
896  // type of the first VCL NAL of the current frame
897  enum NALUnitType first_nal_type;
898 
899  // for checking the frame checksums
900  struct AVMD5 *md5_ctx;
901  uint8_t md5[3][16];
902  uint8_t is_md5;
903 
904  uint8_t context_initialized;
905  uint8_t is_nalff; ///< this flag is != 0 if bitstream is encapsulated
906  ///< as a format defined in 14496-15
907  int apply_defdispwin;
908 
909  int active_seq_parameter_set_id;
910 
911  int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
912  int nuh_layer_id;
913 
914  /** frame packing arrangement variables */
915  int sei_frame_packing_present;
916  int frame_packing_arrangement_type;
917  int content_interpretation_type;
918  int quincunx_subsampling;
919 
920  /** display orientation */
921  int sei_display_orientation_present;
922  int sei_anticlockwise_rotation;
923  int sei_hflip, sei_vflip;
924 
925  int picture_struct;
926 } HEVCContext;
927 
928 int ff_hevc_decode_short_term_rps(HEVCContext *s, ShortTermRPS *rps,
929  const HEVCSPS *sps, int is_slice_header);
930 int ff_hevc_decode_nal_vps(HEVCContext *s);
931 int ff_hevc_decode_nal_sps(HEVCContext *s);
932 int ff_hevc_decode_nal_pps(HEVCContext *s);
933 int ff_hevc_decode_nal_sei(HEVCContext *s);
934 
935 int ff_hevc_extract_rbsp(HEVCContext *s, const uint8_t *src, int length,
936  HEVCNAL *nal);
937 
938 /**
939  * Mark all frames in DPB as unused for reference.
940  */
941 void ff_hevc_clear_refs(HEVCContext *s);
942 
943 /**
944  * Drop all frames currently in DPB.
945  */
946 void ff_hevc_flush_dpb(HEVCContext *s);
947 
948 /**
949  * Compute POC of the current frame and return it.
950  */
951 int ff_hevc_compute_poc(HEVCContext *s, int poc_lsb);
952 
953 RefPicList *ff_hevc_get_ref_list(HEVCContext *s, HEVCFrame *frame,
954  int x0, int y0);
955 
956 /**
957  * Construct the reference picture sets for the current frame.
958  */
959 int ff_hevc_frame_rps(HEVCContext *s);
960 
961 /**
962  * Construct the reference picture list(s) for the current slice.
963  */
964 int ff_hevc_slice_rpl(HEVCContext *s);
965 
966 void ff_hevc_save_states(HEVCContext *s, int ctb_addr_ts);
967 void ff_hevc_cabac_init(HEVCContext *s, int ctb_addr_ts);
968 int ff_hevc_sao_merge_flag_decode(HEVCContext *s);
969 int ff_hevc_sao_type_idx_decode(HEVCContext *s);
970 int ff_hevc_sao_band_position_decode(HEVCContext *s);
971 int ff_hevc_sao_offset_abs_decode(HEVCContext *s);
972 int ff_hevc_sao_offset_sign_decode(HEVCContext *s);
973 int ff_hevc_sao_eo_class_decode(HEVCContext *s);
974 int ff_hevc_end_of_slice_flag_decode(HEVCContext *s);
975 int ff_hevc_cu_transquant_bypass_flag_decode(HEVCContext *s);
976 int ff_hevc_skip_flag_decode(HEVCContext *s, int x0, int y0,
977  int x_cb, int y_cb);
978 int ff_hevc_pred_mode_decode(HEVCContext *s);
979 int ff_hevc_split_coding_unit_flag_decode(HEVCContext *s, int ct_depth,
980  int x0, int y0);
981 int ff_hevc_part_mode_decode(HEVCContext *s, int log2_cb_size);
982 int ff_hevc_pcm_flag_decode(HEVCContext *s);
983 int ff_hevc_prev_intra_luma_pred_flag_decode(HEVCContext *s);
984 int ff_hevc_mpm_idx_decode(HEVCContext *s);
985 int ff_hevc_rem_intra_luma_pred_mode_decode(HEVCContext *s);
986 int ff_hevc_intra_chroma_pred_mode_decode(HEVCContext *s);
987 int ff_hevc_merge_idx_decode(HEVCContext *s);
988 int ff_hevc_merge_flag_decode(HEVCContext *s);
989 int ff_hevc_inter_pred_idc_decode(HEVCContext *s, int nPbW, int nPbH);
990 int ff_hevc_ref_idx_lx_decode(HEVCContext *s, int num_ref_idx_lx);
991 int ff_hevc_mvp_lx_flag_decode(HEVCContext *s);
992 int ff_hevc_no_residual_syntax_flag_decode(HEVCContext *s);
993 int ff_hevc_split_transform_flag_decode(HEVCContext *s, int log2_trafo_size);
994 int ff_hevc_cbf_cb_cr_decode(HEVCContext *s, int trafo_depth);
995 int ff_hevc_cbf_luma_decode(HEVCContext *s, int trafo_depth);
996 int ff_hevc_log2_res_scale_abs(HEVCContext *s, int idx);
997 int ff_hevc_res_scale_sign_flag(HEVCContext *s, int idx);
998 
999 /**
1000  * Get the number of candidate references for the current frame.
1001  */
1002 int ff_hevc_frame_nb_refs(HEVCContext *s);
1003 
1004 int ff_hevc_set_new_ref(HEVCContext *s, AVFrame **frame, int poc);
1005 
1006 /**
1007  * Find next frame in output order and put a reference to it in frame.
1008  * @return 1 if a frame was output, 0 otherwise
1009  */
1010 int ff_hevc_output_frame(HEVCContext *s, AVFrame *frame, int flush);
1011 
1012 void ff_hevc_bump_frame(HEVCContext *s);
1013 
1014 void ff_hevc_unref_frame(HEVCContext *s, HEVCFrame *frame, int flags);
1015 
1016 void ff_hevc_set_neighbour_available(HEVCContext *s, int x0, int y0,
1017  int nPbW, int nPbH);
1018 void ff_hevc_luma_mv_merge_mode(HEVCContext *s, int x0, int y0,
1019  int nPbW, int nPbH, int log2_cb_size,
1020  int part_idx, int merge_idx, MvField *mv);
1021 void ff_hevc_luma_mv_mvp_mode(HEVCContext *s, int x0, int y0,
1022  int nPbW, int nPbH, int log2_cb_size,
1023  int part_idx, int merge_idx,
1024  MvField *mv, int mvp_lx_flag, int LX);
1025 void ff_hevc_set_qPy(HEVCContext *s, int xBase, int yBase,
1026  int log2_cb_size);
1027 void ff_hevc_deblocking_boundary_strengths(HEVCContext *s, int x0, int y0,
1028  int log2_trafo_size);
1029 int ff_hevc_cu_qp_delta_sign_flag(HEVCContext *s);
1030 int ff_hevc_cu_qp_delta_abs(HEVCContext *s);
1031 int ff_hevc_cu_chroma_qp_offset_flag(HEVCContext *s);
1032 int ff_hevc_cu_chroma_qp_offset_idx(HEVCContext *s);
1033 void ff_hevc_hls_filter(HEVCContext *s, int x, int y, int ctb_size);
1034 void ff_hevc_hls_filters(HEVCContext *s, int x_ctb, int y_ctb, int ctb_size);
1035 void ff_hevc_hls_residual_coding(HEVCContext *s, int x0, int y0,
1036  int log2_trafo_size, enum ScanType scan_idx,
1037  int c_idx);
1038 
1039 void ff_hevc_hls_mvd_coding(HEVCContext *s, int x0, int y0, int log2_cb_size);
1040 
1041 
1042 extern const uint8_t ff_hevc_qpel_extra_before[4];
1043 extern const uint8_t ff_hevc_qpel_extra_after[4];
1044 extern const uint8_t ff_hevc_qpel_extra[4];
1045 
1046 extern const uint8_t ff_hevc_diag_scan4x4_x[16];
1047 extern const uint8_t ff_hevc_diag_scan4x4_y[16];
1048 extern const uint8_t ff_hevc_diag_scan8x8_x[64];
1049 extern const uint8_t ff_hevc_diag_scan8x8_y[64];
1050 
1051 #endif /* AVCODEC_HEVC_H */
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