FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/h264dec.h
Date: 2026-09-14 12:48:48
Exec Total Coverage
Lines: 10 10 100.0%
Functions: 2 2 100.0%
Branches: 7 12 58.3%
Line Branch Exec Source
1 /*
2 * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * H.264 / AVC / MPEG-4 part10 codec.
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
27
28 #ifndef AVCODEC_H264DEC_H
29 #define AVCODEC_H264DEC_H
30
31 #include "libavutil/mem_internal.h"
32
33 #include "cabac.h"
34 #include "error_resilience.h"
35 #include "h264_parse.h"
36 #include "h264_ps.h"
37 #include "h264_sei.h"
38 #include "h2645_parse.h"
39 #include "h264chroma.h"
40 #include "h264dsp.h"
41 #include "h264pred.h"
42 #include "h264qpel.h"
43 #include "mpegutils.h"
44 #include "threadframe.h"
45 #include "videodsp.h"
46
47 #define H264_MAX_PICTURE_COUNT 36
48
49 /* Compiling in interlaced support reduces the speed
50 * of progressive decoding by about 2%. */
51 #define ALLOW_INTERLACE
52
53 #define FMO 0
54
55 /**
56 * The maximum number of slices supported by the decoder.
57 * must be a power of 2
58 */
59 #define MAX_SLICES 32
60
61 #ifdef ALLOW_INTERLACE
62 #define MB_MBAFF(h) (h)->mb_mbaff
63 #define MB_FIELD(sl) (sl)->mb_field_decoding_flag
64 #define FRAME_MBAFF(h) (h)->mb_aff_frame
65 #define FIELD_PICTURE(h) ((h)->picture_structure != PICT_FRAME)
66 #define LEFT_MBS 2
67 #define LTOP 0
68 #define LBOT 1
69 #define LEFT(i) (i)
70 #else
71 #define MB_MBAFF(h) 0
72 #define MB_FIELD(sl) 0
73 #define FRAME_MBAFF(h) 0
74 #define FIELD_PICTURE(h) 0
75 #undef IS_INTERLACED
76 #define IS_INTERLACED(mb_type) 0
77 #define LEFT_MBS 1
78 #define LTOP 0
79 #define LBOT 0
80 #define LEFT(i) 0
81 #endif
82 #define FIELD_OR_MBAFF_PICTURE(h) (FRAME_MBAFF(h) || FIELD_PICTURE(h))
83
84 #ifndef CABAC
85 #define CABAC(h) (h)->ps.pps->cabac
86 #endif
87
88 #define CHROMA(h) ((h)->ps.sps->chroma_format_idc)
89 #define CHROMA422(h) ((h)->ps.sps->chroma_format_idc == 2)
90 #define CHROMA444(h) ((h)->ps.sps->chroma_format_idc == 3)
91
92 #define IS_REF0(a) ((a) & MB_TYPE_REF0)
93 #define IS_8x8DCT(a) ((a) & MB_TYPE_8x8DCT)
94 #define IS_SUB_8X8(a) ((a) & MB_TYPE_16x16) // note reused
95 #define IS_SUB_8X4(a) ((a) & MB_TYPE_16x8) // note reused
96 #define IS_SUB_4X8(a) ((a) & MB_TYPE_8x16) // note reused
97 #define IS_SUB_4X4(a) ((a) & MB_TYPE_8x8) // note reused
98 #define IS_DIR(a, part, list) ((a) & (MB_TYPE_P0L0 << ((part) + 2 * (list))))
99
100 // does this mb use listX, note does not work if subMBs
101 #define USES_LIST(a, list) ((a) & ((MB_TYPE_P0L0 | MB_TYPE_P1L0) << (2 * (list))))
102
103 /**
104 * Memory management control operation.
105 */
106 typedef struct MMCO {
107 MMCOOpcode opcode;
108 int short_pic_num; ///< pic_num without wrapping (pic_num & max_pic_num)
109 int long_arg; ///< index, pic_num, or num long refs depending on opcode
110 } MMCO;
111
112 typedef struct H264Picture {
113 AVFrame *f;
114 ThreadFrame tf;
115
116 AVFrame *f_grain;
117
118 int8_t *qscale_table_base; ///< RefStruct reference
119 int8_t *qscale_table;
120
121 int16_t (*motion_val_base[2])[2]; ///< RefStruct reference
122 int16_t (*motion_val[2])[2];
123
124 uint32_t *mb_type_base; ///< RefStruct reference
125 uint32_t *mb_type;
126
127 /// RefStruct reference for hardware accelerator private data
128 void *hwaccel_picture_private;
129
130 int8_t *ref_index[2]; ///< RefStruct reference
131
132 int field_poc[2]; ///< top/bottom POC
133 int poc; ///< frame POC
134 int frame_num; ///< frame_num (raw frame_num from slice header)
135 int mmco_reset; /**< MMCO_RESET set this 1. Reordering code must
136 not mix pictures before and after MMCO_RESET. */
137 int pic_id; /**< pic_num (short -> no wrap version of pic_num,
138 pic_num & max_pic_num; long -> long_pic_num) */
139 int long_ref; ///< 1->long term reference 0->short term reference
140 int ref_poc[2][2][32]; ///< POCs of the frames/fields used as reference (FIXME need per slice)
141 int ref_count[2][2]; ///< number of entries in ref_poc (FIXME need per slice)
142 int mbaff; ///< 1 -> MBAFF frame 0-> not MBAFF
143 int field_picture; ///< whether or not picture was encoded in separate fields
144
145 /**
146 * H264Picture.reference has this flag set,
147 * when the picture is held for delayed output.
148 */
149 #define DELAYED_PIC_REF (1 << 2)
150 int reference;
151 int recovered; ///< picture at IDR or recovery point + recovery count
152 int invalid_gap;
153 int sei_recovery_frame_cnt;
154 int needs_fg; ///< whether picture needs film grain synthesis (see `f_grain`)
155
156 const PPS *pps;
157
158 int mb_width, mb_height;
159 int mb_stride;
160
161 /// RefStruct reference; its pointee is shared between decoding threads.
162 atomic_int *decode_error_flags;
163
164 int gray;
165 } H264Picture;
166
167 typedef struct H264Ref {
168 uint8_t *data[3];
169 int linesize[3];
170
171 int reference;
172 int poc;
173 int pic_id;
174
175 const H264Picture *parent;
176 } H264Ref;
177
178 typedef struct H264SliceContext {
179 const struct H264Context *h264;
180 GetBitContext gb;
181 ERContext *er;
182
183 /* Data partitioning: residual comes from gb_dpb (intra) or gb_dpc (inter),
184 * chosen per macroblock. Values not pointers: this struct is memcpy'd. */
185 GetBitContext gb_dpb;
186 GetBitContext gb_dpc;
187 int data_partitioning;
188 int dpb_available;
189 int dpc_available;
190 unsigned slice_id;
191
192 int slice_num;
193 int slice_type;
194 int slice_type_nos; ///< S free slice type (SI/SP are remapped to I/P)
195 int slice_type_fixed;
196
197 int qscale;
198 int chroma_qp[2]; // QPc
199 int qp_thresh; ///< QP threshold to skip loopfilter
200 int last_qscale_diff;
201
202 // deblock
203 int deblocking_filter; ///< disable_deblocking_filter_idc with 1 <-> 0
204 int slice_alpha_c0_offset;
205 int slice_beta_offset;
206
207 H264PredWeightTable pwt;
208
209 int prev_mb_skipped;
210 int next_mb_skipped;
211
212 int chroma_pred_mode;
213 int intra16x16_pred_mode;
214
215 int8_t intra4x4_pred_mode_cache[5 * 8];
216 int8_t(*intra4x4_pred_mode);
217
218 int topleft_mb_xy;
219 int top_mb_xy;
220 int topright_mb_xy;
221 int left_mb_xy[LEFT_MBS];
222
223 int topleft_type;
224 int top_type;
225 int topright_type;
226 int left_type[LEFT_MBS];
227
228 const uint8_t *left_block;
229 int topleft_partition;
230
231 unsigned int topleft_samples_available;
232 unsigned int top_samples_available;
233 unsigned int topright_samples_available;
234 unsigned int left_samples_available;
235
236 ptrdiff_t linesize, uvlinesize;
237 ptrdiff_t mb_linesize; ///< may be equal to s->linesize or s->linesize * 2, for mbaff
238 ptrdiff_t mb_uvlinesize;
239
240 int mb_x, mb_y;
241 int mb_xy;
242 int resync_mb_x;
243 int resync_mb_y;
244 unsigned int first_mb_addr;
245 // index of the first MB of the next slice
246 int next_slice_idx;
247 int mb_skip_run;
248 int is_complex;
249
250 int picture_structure;
251 int mb_field_decoding_flag;
252 int mb_mbaff; ///< mb_aff_frame && mb_field_decoding_flag
253
254 int redundant_pic_count;
255
256 /**
257 * number of neighbors (top and/or left) that used 8x8 dct
258 */
259 int neighbor_transform_size;
260
261 int direct_spatial_mv_pred;
262 int col_parity;
263 int col_fieldoff;
264
265 int cbp;
266 int top_cbp;
267 int left_cbp;
268
269 int dist_scale_factor[32];
270 int dist_scale_factor_field[2][32];
271 int map_col_to_list0[2][16 + 32];
272 int map_col_to_list0_field[2][2][16 + 32];
273
274 /**
275 * num_ref_idx_l0/1_active_minus1 + 1
276 */
277 unsigned int ref_count[2]; ///< counts frames or fields, depending on current mb mode
278 unsigned int list_count;
279 H264Ref ref_list[2][48]; /**< 0..15: frame refs, 16..47: mbaff field refs.
280 * Reordered version of default_ref_list
281 * according to picture reordering in slice header */
282 struct {
283 uint8_t op;
284 uint32_t val;
285 } ref_modifications[2][32];
286 int nb_ref_modifications[2];
287
288 unsigned int pps_id;
289
290 const uint8_t *intra_pcm_ptr;
291
292 uint8_t *bipred_scratchpad;
293 uint8_t *edge_emu_buffer;
294 uint8_t (*top_borders[2])[(16 * 3) * 2];
295 int bipred_scratchpad_allocated;
296 int edge_emu_buffer_allocated;
297 int top_borders_allocated[2];
298
299 /**
300 * non zero coeff count cache.
301 * is 64 if not available.
302 */
303 DECLARE_ALIGNED(8, uint8_t, non_zero_count_cache)[15 * 8];
304
305 /**
306 * Motion vector cache.
307 */
308 DECLARE_ALIGNED(16, int16_t, mv_cache)[2][5 * 8][2];
309 DECLARE_ALIGNED(8, int8_t, ref_cache)[2][5 * 8];
310 DECLARE_ALIGNED(16, uint8_t, mvd_cache)[2][5 * 8][2];
311 uint8_t direct_cache[5 * 8];
312
313 DECLARE_ALIGNED(8, uint16_t, sub_mb_type)[4];
314
315 /// as a DCT coefficient is int32_t in high depth, we need to reserve twice the space.
316 DECLARE_ALIGNED(16, int16_t, mb)[16 * 48 * 2];
317 DECLARE_ALIGNED(16, int16_t, mb_luma_dc)[3][16 * 2];
318 /// as mb is addressed by scantable[i] and scantable is uint8_t we can either
319 /// check that i is not too large or ensure that there is some unused stuff after mb
320 int16_t mb_padding[256 * 2];
321
322 uint8_t (*mvd_table[2])[2];
323
324 /**
325 * Cabac
326 */
327 CABACContext cabac;
328 uint8_t cabac_state[1024];
329 int cabac_init_idc;
330
331 MMCO mmco[H264_MAX_MMCO_COUNT];
332 int nb_mmco;
333 int explicit_ref_marking;
334
335 int frame_num;
336 int idr_pic_id;
337 int poc_lsb;
338 int delta_poc_bottom;
339 int delta_poc[2];
340 int curr_pic_num;
341 int max_pic_num;
342 } H264SliceContext;
343
344 /**
345 * H264Context
346 */
347 typedef struct H264Context {
348 const AVClass *class;
349 AVCodecContext *avctx;
350 VideoDSPContext vdsp;
351 H264DSPContext h264dsp;
352 H264ChromaContext h264chroma;
353 H264QpelContext h264qpel;
354
355 H264Picture DPB[H264_MAX_PICTURE_COUNT];
356 H264Picture *cur_pic_ptr;
357 H264Picture cur_pic;
358 H264Picture last_pic_for_ec;
359
360 H264SliceContext *slice_ctx;
361 int nb_slice_ctx;
362 int nb_slice_ctx_queued;
363
364 H2645Packet pkt;
365
366 int pixel_shift; ///< 0 for 8-bit H.264, 1 for high-bit-depth H.264
367
368 /* coded dimensions -- 16 * mb w/h */
369 int width, height;
370 int chroma_x_shift, chroma_y_shift;
371
372 int droppable;
373
374 int context_initialized;
375 int flags;
376 int workaround_bugs;
377 int x264_build;
378 /* Set when slice threading is used and at least one slice uses deblocking
379 * mode 1 (i.e. across slice boundaries). Then we disable the loop filter
380 * during normal MB decoding and execute it serially at the end.
381 */
382 int postpone_filter;
383
384 /*
385 * Set to 1 when the current picture is IDR, 0 otherwise.
386 */
387 int picture_idr;
388
389 /*
390 * Set to 1 when the current picture contains only I slices, 0 otherwise.
391 */
392 int picture_intra_only;
393
394 int crop_left;
395 int crop_right;
396 int crop_top;
397 int crop_bottom;
398
399 int8_t(*intra4x4_pred_mode);
400 H264PredContext hpc;
401
402 uint8_t (*non_zero_count)[48];
403
404 #define LIST_NOT_USED -1 // FIXME rename?
405
406 /**
407 * block_offset[ 0..23] for frame macroblocks
408 * block_offset[24..47] for field macroblocks
409 */
410 int block_offset[2 * (16 * 3)];
411
412 uint32_t *mb2b_xy; // FIXME are these 4 a good idea?
413 uint32_t *mb2br_xy;
414 int b_stride; // FIXME use s->b4_stride
415
416 uint16_t *slice_table; ///< slice_table_base + 2*mb_stride + 1
417
418 // interlacing specific flags
419 int mb_aff_frame;
420 int picture_structure;
421 int first_field;
422
423 uint8_t *list_counts; ///< Array of list_count per MB specifying the slice type
424
425 /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0, 1, 2), 0x0? luma_cbp */
426 uint16_t *cbp_table;
427
428 /* chroma_pred_mode for i4x4 or i16x16, else 0 */
429 uint8_t *chroma_pred_mode_table;
430 uint8_t (*mvd_table[2])[2];
431 uint8_t *direct_table;
432
433 uint8_t scan_padding[16];
434 uint8_t zigzag_scan[16];
435 uint8_t zigzag_scan8x8[64];
436 uint8_t zigzag_scan8x8_cavlc[64];
437 uint8_t field_scan[16];
438 uint8_t field_scan8x8[64];
439 uint8_t field_scan8x8_cavlc[64];
440 uint8_t zigzag_scan_q0[16];
441 uint8_t zigzag_scan8x8_q0[64];
442 uint8_t zigzag_scan8x8_cavlc_q0[64];
443 uint8_t field_scan_q0[16];
444 uint8_t field_scan8x8_q0[64];
445 uint8_t field_scan8x8_cavlc_q0[64];
446
447 int mb_y;
448 int mb_height, mb_width;
449 int mb_stride;
450 int mb_num;
451
452 // =============================================================
453 // Things below are not used in the MB or more inner code
454
455 int nal_ref_idc;
456 int nal_unit_type;
457
458 int has_slice; ///< slice NAL is found in the packet, set by decode_nal_units, its state does not need to be preserved outside h264_decode_frame()
459
460 /**
461 * Used to parse AVC variant of H.264
462 */
463 int is_avc; ///< this flag is != 0 if codec is avc1
464 int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
465
466 int bit_depth_luma; ///< luma bit depth from sps to detect changes
467 int chroma_format_idc; ///< chroma format from sps to detect changes
468
469 H264ParamSets ps;
470
471 uint16_t *slice_table_base;
472
473 H264POCContext poc;
474
475 H264Ref default_ref[2];
476 H264Picture *short_ref[32];
477 H264Picture *long_ref[32];
478 H264Picture *delayed_pic[H264_MAX_DPB_FRAMES + 2]; // FIXME size?
479 int last_pocs[H264_MAX_DPB_FRAMES];
480 H264Picture *next_output_pic;
481 int next_outputed_poc;
482 int poc_offset; ///< PicOrderCnt_offset from SMPTE RDD-2006
483
484 /**
485 * memory management control operations buffer.
486 */
487 MMCO mmco[H264_MAX_MMCO_COUNT];
488 int nb_mmco;
489 int mmco_reset;
490 int explicit_ref_marking;
491
492 int long_ref_count; ///< number of actual long term references
493 int short_ref_count; ///< number of actual short term references
494
495 /**
496 * @name Members for slice based multithreading
497 * @{
498 */
499 /**
500 * current slice number, used to initialize slice_num of each thread/context
501 */
502 int current_slice;
503
504 /** @} */
505
506 /**
507 * Complement sei_pic_struct
508 * SEI_PIC_STRUCT_TOP_BOTTOM and SEI_PIC_STRUCT_BOTTOM_TOP indicate interlaced frames.
509 * However, soft telecined frames may have these values.
510 * This is used in an attempt to flag soft telecine progressive.
511 */
512 int prev_interlaced_frame;
513
514 /**
515 * Are the SEI recovery points looking valid.
516 */
517 int valid_recovery_point;
518
519 /**
520 * recovery_frame is the frame_num at which the next frame should
521 * be fully constructed.
522 *
523 * Set to -1 when not expecting a recovery point.
524 */
525 int recovery_frame;
526
527 /**
528 * We have seen an IDR, so all the following frames in coded order are correctly
529 * decodable.
530 */
531 #define FRAME_RECOVERED_IDR (1 << 0)
532 /**
533 * Sufficient number of frames have been decoded since a SEI recovery point,
534 * so all the following frames in presentation order are correct.
535 */
536 #define FRAME_RECOVERED_SEI (1 << 1)
537 /**
538 * Recovery point detected by heuristic
539 */
540 #define FRAME_RECOVERED_HEURISTIC (1 << 2)
541
542 /**
543 * Initial frame has been completely recovered.
544 *
545 * Once this is set, all following decoded as well as displayed frames will be marked as recovered
546 * If a frame is marked as recovered frame_recovered will be set once this frame is output and thus
547 * all subsequently output fraames are also marked as recovered
548 *
549 * In effect, if you want all subsequent DECODED frames marked as recovered, set frame_recovered
550 * If you want all subsequent DISPLAYED frames marked as recovered, set the frame->recovered
551 */
552 int frame_recovered;
553
554 int has_recovery_point;
555
556 int missing_fields;
557
558 /* for frame threading, this is set to 1
559 * after finish_setup() has been called, so we cannot modify
560 * some context properties (which are supposed to stay constant between
561 * slices) anymore */
562 int setup_finished;
563
564 int cur_chroma_format_idc;
565 int cur_bit_depth_luma;
566 int16_t slice_row[MAX_SLICES]; ///< to detect when MAX_SLICES is too low
567
568 /* original AVCodecContext dimensions, used to handle container
569 * cropping */
570 int width_from_caller;
571 int height_from_caller;
572
573 int enable_er;
574 ERContext er;
575 int16_t *dc_val_base;
576
577 H264SEIContext sei;
578
579 struct AVRefStructPool *qscale_table_pool;
580 struct AVRefStructPool *mb_type_pool;
581 struct AVRefStructPool *motion_val_pool;
582 struct AVRefStructPool *ref_index_pool;
583 struct AVRefStructPool *decode_error_flags_pool;
584 int ref2frm[MAX_SLICES][2][64]; ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1
585
586 int non_gray; ///< Did we encounter a intra frame after a gray gap frame
587 int noref_gray;
588 int skip_gray;
589 } H264Context;
590
591 extern const uint16_t ff_h264_mb_sizes[4];
592
593 /**
594 * Reconstruct bitstream slice_type.
595 */
596 int ff_h264_get_slice_type(const H264SliceContext *sl);
597
598 /**
599 * Allocate tables.
600 * needs width/height
601 */
602 int ff_h264_alloc_tables(H264Context *h);
603
604 int ff_h264_decode_ref_pic_list_reordering(H264SliceContext *sl, void *logctx);
605 int ff_h264_build_ref_list(H264Context *h, H264SliceContext *sl);
606 void ff_h264_remove_all_refs(H264Context *h);
607
608 /**
609 * Execute the reference picture marking (memory management control operations).
610 */
611 int ff_h264_execute_ref_pic_marking(H264Context *h);
612
613 int ff_h264_decode_ref_pic_marking(H264SliceContext *sl, GetBitContext *gb,
614 const H2645NAL *nal, void *logctx);
615
616 void ff_h264_hl_decode_mb(const H264Context *h, H264SliceContext *sl);
617 void ff_h264_decode_init_vlc(void);
618
619 /**
620 * Decode a macroblock
621 * @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
622 */
623 int ff_h264_decode_mb_cavlc(const H264Context *h, H264SliceContext *sl);
624
625 /**
626 * Decode a CABAC coded macroblock
627 * @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
628 */
629 int ff_h264_decode_mb_cabac(const H264Context *h, H264SliceContext *sl);
630
631 void ff_h264_init_cabac_states(const H264Context *h, H264SliceContext *sl);
632
633 void ff_h264_direct_dist_scale_factor(const H264Context *const h, H264SliceContext *sl);
634 void ff_h264_direct_ref_list_init(const H264Context *const h, H264SliceContext *sl);
635 void ff_h264_pred_direct_motion(const H264Context *const h, H264SliceContext *sl,
636 int *mb_type);
637
638 void ff_h264_filter_mb_fast(const H264Context *h, H264SliceContext *sl, int mb_x, int mb_y,
639 uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
640 unsigned int linesize, unsigned int uvlinesize);
641 void ff_h264_filter_mb(const H264Context *h, H264SliceContext *sl, int mb_x, int mb_y,
642 uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
643 unsigned int linesize, unsigned int uvlinesize);
644
645 /*
646 * o-o o-o
647 * / / /
648 * o-o o-o
649 * ,---'
650 * o-o o-o
651 * / / /
652 * o-o o-o
653 */
654
655 /* Scan8 organization:
656 * 0 1 2 3 4 5 6 7
657 * 0 DY y y y y y
658 * 1 y Y Y Y Y
659 * 2 y Y Y Y Y
660 * 3 y Y Y Y Y
661 * 4 y Y Y Y Y
662 * 5 DU u u u u u
663 * 6 u U U U U
664 * 7 u U U U U
665 * 8 u U U U U
666 * 9 u U U U U
667 * 10 DV v v v v v
668 * 11 v V V V V
669 * 12 v V V V V
670 * 13 v V V V V
671 * 14 v V V V V
672 * DY/DU/DV are for luma/chroma DC.
673 */
674
675 #define LUMA_DC_BLOCK_INDEX 48
676 #define CHROMA_DC_BLOCK_INDEX 49
677
678 /**
679 * Get the chroma qp.
680 */
681 65345746 static av_always_inline int get_chroma_qp(const PPS *pps, int t, int qscale)
682 {
683 65345746 return pps->chroma_qp_table[t][qscale];
684 }
685
686 85719 static inline int ff_h264_skip_all_pixels(const AVCodecContext *avctx)
687 {
688 86287 return avctx->skip_pred >= AVDISCARD_ALL &&
689
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 568 avctx->skip_idct >= AVDISCARD_ALL &&
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 568 !avctx->err_recognition &&
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 568 !(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS) &&
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 568 !(avctx->export_side_data & (AV_CODEC_EXPORT_DATA_MVS |
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 86287 AV_CODEC_EXPORT_DATA_VIDEO_ENC_PARAMS)) &&
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 568 !(avctx->debug & (FF_DEBUG_QP | FF_DEBUG_MB_TYPE));
695 }
696
697 int ff_h264_field_end(H264Context *h, H264SliceContext *sl, int in_setup);
698
699 int ff_h264_ref_picture(H264Picture *dst, const H264Picture *src);
700 int ff_h264_replace_picture(H264Picture *dst, const H264Picture *src);
701 void ff_h264_unref_picture(H264Picture *pic);
702
703 void ff_h264_slice_context_init(H264Context *h, H264SliceContext *sl);
704
705 void ff_h264_draw_horiz_band(const H264Context *h, H264SliceContext *sl, int y, int height);
706
707 /**
708 * Submit a slice for decoding.
709 *
710 * Parse the slice header, starting a new field/frame if necessary. If any
711 * slices are queued for the previous field, they are decoded.
712 *
713 * @param queued set to the queued context, or NULL if the slice was discarded
714 */
715 int ff_h264_queue_decode_slice(H264Context *h, const H2645NAL *nal,
716 H264SliceContext **queued);
717
718 /**
719 * Attach a slice data partition B or C to the slice started by partition A.
720 */
721 int ff_h264_attach_slice_partition(const H264Context *h, H264SliceContext *sl,
722 const H2645NAL *nal);
723
724 int ff_h264_execute_decode_slices(H264Context *h);
725 int ff_h264_update_thread_context(AVCodecContext *dst,
726 const AVCodecContext *src);
727 int ff_h264_update_thread_context_for_user(AVCodecContext *dst,
728 const AVCodecContext *src);
729
730 void ff_h264_flush_change(H264Context *h);
731
732 void ff_h264_free_tables(H264Context *h);
733
734 void ff_h264_set_erpic(ERPicture *dst, const H264Picture *src);
735
736 #endif /* AVCODEC_H264DEC_H */
737