FFmpeg coverage

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/buffer.h"
32			#include "libavutil/mem_internal.h"
33
34			#include "cabac.h"
35			#include "error_resilience.h"
36			#include "h264_parse.h"
37			#include "h264_ps.h"
38			#include "h264_sei.h"
39			#include "h2645_parse.h"
40			#include "h264chroma.h"
41			#include "h264dsp.h"
42			#include "h264pred.h"
43			#include "h264qpel.h"
44			#include "h274.h"
45			#include "mpegutils.h"
46			#include "threadframe.h"
47			#include "videodsp.h"
48
49			#define H264_MAX_PICTURE_COUNT 36
50
51			/* Compiling in interlaced support reduces the speed
52			* of progressive decoding by about 2%. */
53			#define ALLOW_INTERLACE
54
55			#define FMO 0
56
57			/**
58			* The maximum number of slices supported by the decoder.
59			* must be a power of 2
60			*/
61			#define MAX_SLICES 32
62
63			#ifdef ALLOW_INTERLACE
64			#define MB_MBAFF(h) (h)->mb_mbaff
65			#define MB_FIELD(sl) (sl)->mb_field_decoding_flag
66			#define FRAME_MBAFF(h) (h)->mb_aff_frame
67			#define FIELD_PICTURE(h) ((h)->picture_structure != PICT_FRAME)
68			#define LEFT_MBS 2
69			#define LTOP 0
70			#define LBOT 1
71			#define LEFT(i) (i)
72			#else
73			#define MB_MBAFF(h) 0
74			#define MB_FIELD(sl) 0
75			#define FRAME_MBAFF(h) 0
76			#define FIELD_PICTURE(h) 0
77			#undef IS_INTERLACED
78			#define IS_INTERLACED(mb_type) 0
79			#define LEFT_MBS 1
80			#define LTOP 0
81			#define LBOT 0
82			#define LEFT(i) 0
83			#endif
84			#define FIELD_OR_MBAFF_PICTURE(h) (FRAME_MBAFF(h) || FIELD_PICTURE(h))
85
86			#ifndef CABAC
87			#define CABAC(h) (h)->ps.pps->cabac
88			#endif
89
90			#define CHROMA(h) ((h)->ps.sps->chroma_format_idc)
91			#define CHROMA422(h) ((h)->ps.sps->chroma_format_idc == 2)
92			#define CHROMA444(h) ((h)->ps.sps->chroma_format_idc == 3)
93
94			#define IS_REF0(a) ((a) & MB_TYPE_REF0)
95			#define IS_8x8DCT(a) ((a) & MB_TYPE_8x8DCT)
96			#define IS_SUB_8X8(a) ((a) & MB_TYPE_16x16) // note reused
97			#define IS_SUB_8X4(a) ((a) & MB_TYPE_16x8) // note reused
98			#define IS_SUB_4X8(a) ((a) & MB_TYPE_8x16) // note reused
99			#define IS_SUB_4X4(a) ((a) & MB_TYPE_8x8) // note reused
100			#define IS_DIR(a, part, list) ((a) & (MB_TYPE_P0L0 << ((part) + 2 * (list))))
101
102			// does this mb use listX, note does not work if subMBs
103			#define USES_LIST(a, list) ((a) & ((MB_TYPE_P0L0 | MB_TYPE_P1L0) << (2 * (list))))
104
105			/**
106			* Memory management control operation.
107			*/
108			typedef struct MMCO {
109			MMCOOpcode opcode;
110			int short_pic_num; ///< pic_num without wrapping (pic_num & max_pic_num)
111			int long_arg; ///< index, pic_num, or num long refs depending on opcode
112			} MMCO;
113
114			typedef struct H264Picture {
115			AVFrame *f;
116			ThreadFrame tf;
117
118			AVFrame *f_grain;
119
120			int8_t *qscale_table_base; ///< RefStruct reference
121			int8_t *qscale_table;
122
123			int16_t (*motion_val_base[2])[2]; ///< RefStruct reference
124			int16_t (*motion_val[2])[2];
125
126			uint32_t *mb_type_base; ///< RefStruct reference
127			uint32_t *mb_type;
128
129			/// RefStruct reference for hardware accelerator private data
130			void *hwaccel_picture_private;
131
132			int8_t *ref_index[2]; ///< RefStruct reference
133
134			int field_poc[2]; ///< top/bottom POC
135			int poc; ///< frame POC
136			int frame_num; ///< frame_num (raw frame_num from slice header)
137			int mmco_reset; /**< MMCO_RESET set this 1. Reordering code must
138			not mix pictures before and after MMCO_RESET. */
139			int pic_id; /**< pic_num (short -> no wrap version of pic_num,
140			pic_num & max_pic_num; long -> long_pic_num) */
141			int long_ref; ///< 1->long term reference 0->short term reference
142			int ref_poc[2][2][32]; ///< POCs of the frames/fields used as reference (FIXME need per slice)
143			int ref_count[2][2]; ///< number of entries in ref_poc (FIXME need per slice)
144			int mbaff; ///< 1 -> MBAFF frame 0-> not MBAFF
145			int field_picture; ///< whether or not picture was encoded in separate fields
146
147			/**
148			* H264Picture.reference has this flag set,
149			* when the picture is held for delayed output.
150			*/
151			#define DELAYED_PIC_REF (1 << 2)
152			int reference;
153			int recovered; ///< picture at IDR or recovery point + recovery count
154			int invalid_gap;
155			int sei_recovery_frame_cnt;
156			int needs_fg; ///< whether picture needs film grain synthesis (see `f_grain`)
157
158			const PPS *pps;
159
160			int mb_width, mb_height;
161			int mb_stride;
162
163			/// RefStruct reference; its pointee is shared between decoding threads.
164			atomic_int *decode_error_flags;
165
166			int gray;
167			} H264Picture;
168
169			typedef struct H264Ref {
170			uint8_t *data[3];
171			int linesize[3];
172
173			int reference;
174			int poc;
175			int pic_id;
176
177			const H264Picture *parent;
178			} H264Ref;
179
180			typedef struct H264SliceContext {
181			const struct H264Context *h264;
182			GetBitContext gb;
183			ERContext *er;
184
185			int slice_num;
186			int slice_type;
187			int slice_type_nos; ///< S free slice type (SI/SP are remapped to I/P)
188			int slice_type_fixed;
189
190			int qscale;
191			int chroma_qp[2]; // QPc
192			int qp_thresh; ///< QP threshold to skip loopfilter
193			int last_qscale_diff;
194
195			// deblock
196			int deblocking_filter; ///< disable_deblocking_filter_idc with 1 <-> 0
197			int slice_alpha_c0_offset;
198			int slice_beta_offset;
199
200			H264PredWeightTable pwt;
201
202			int prev_mb_skipped;
203			int next_mb_skipped;
204
205			int chroma_pred_mode;
206			int intra16x16_pred_mode;
207
208			int8_t intra4x4_pred_mode_cache[5 * 8];
209			int8_t(*intra4x4_pred_mode);
210
211			int topleft_mb_xy;
212			int top_mb_xy;
213			int topright_mb_xy;
214			int left_mb_xy[LEFT_MBS];
215
216			int topleft_type;
217			int top_type;
218			int topright_type;
219			int left_type[LEFT_MBS];
220
221			const uint8_t *left_block;
222			int topleft_partition;
223
224			unsigned int topleft_samples_available;
225			unsigned int top_samples_available;
226			unsigned int topright_samples_available;
227			unsigned int left_samples_available;
228
229			ptrdiff_t linesize, uvlinesize;
230			ptrdiff_t mb_linesize; ///< may be equal to s->linesize or s->linesize * 2, for mbaff
231			ptrdiff_t mb_uvlinesize;
232
233			int mb_x, mb_y;
234			int mb_xy;
235			int resync_mb_x;
236			int resync_mb_y;
237			unsigned int first_mb_addr;
238			// index of the first MB of the next slice
239			int next_slice_idx;
240			int mb_skip_run;
241			int is_complex;
242
243			int picture_structure;
244			int mb_field_decoding_flag;
245			int mb_mbaff; ///< mb_aff_frame && mb_field_decoding_flag
246
247			int redundant_pic_count;
248
249			/**
250			* number of neighbors (top and/or left) that used 8x8 dct
251			*/
252			int neighbor_transform_size;
253
254			int direct_spatial_mv_pred;
255			int col_parity;
256			int col_fieldoff;
257
258			int cbp;
259			int top_cbp;
260			int left_cbp;
261
262			int dist_scale_factor[32];
263			int dist_scale_factor_field[2][32];
264			int map_col_to_list0[2][16 + 32];
265			int map_col_to_list0_field[2][2][16 + 32];
266
267			/**
268			* num_ref_idx_l0/1_active_minus1 + 1
269			*/
270			unsigned int ref_count[2]; ///< counts frames or fields, depending on current mb mode
271			unsigned int list_count;
272			H264Ref ref_list[2][48]; /**< 0..15: frame refs, 16..47: mbaff field refs.
273			* Reordered version of default_ref_list
274			* according to picture reordering in slice header */
275			struct {
276			uint8_t op;
277			uint32_t val;
278			} ref_modifications[2][32];
279			int nb_ref_modifications[2];
280
281			unsigned int pps_id;
282
283			const uint8_t *intra_pcm_ptr;
284
285			uint8_t *bipred_scratchpad;
286			uint8_t *edge_emu_buffer;
287			uint8_t (*top_borders[2])[(16 * 3) * 2];
288			int bipred_scratchpad_allocated;
289			int edge_emu_buffer_allocated;
290			int top_borders_allocated[2];
291
292			/**
293			* non zero coeff count cache.
294			* is 64 if not available.
295			*/
296			DECLARE_ALIGNED(8, uint8_t, non_zero_count_cache)[15 * 8];
297
298			/**
299			* Motion vector cache.
300			*/
301			DECLARE_ALIGNED(16, int16_t, mv_cache)[2][5 * 8][2];
302			DECLARE_ALIGNED(8, int8_t, ref_cache)[2][5 * 8];
303			DECLARE_ALIGNED(16, uint8_t, mvd_cache)[2][5 * 8][2];
304			uint8_t direct_cache[5 * 8];
305
306			DECLARE_ALIGNED(8, uint16_t, sub_mb_type)[4];
307
308			///< as a DCT coefficient is int32_t in high depth, we need to reserve twice the space.
309			DECLARE_ALIGNED(16, int16_t, mb)[16 * 48 * 2];
310			DECLARE_ALIGNED(16, int16_t, mb_luma_dc)[3][16 * 2];
311			///< as mb is addressed by scantable[i] and scantable is uint8_t we can either
312			///< check that i is not too large or ensure that there is some unused stuff after mb
313			int16_t mb_padding[256 * 2];
314
315			uint8_t (*mvd_table[2])[2];
316
317			/**
318			* Cabac
319			*/
320			CABACContext cabac;
321			uint8_t cabac_state[1024];
322			int cabac_init_idc;
323
324			MMCO mmco[H264_MAX_MMCO_COUNT];
325			int nb_mmco;
326			int explicit_ref_marking;
327
328			int frame_num;
329			int idr_pic_id;
330			int poc_lsb;
331			int delta_poc_bottom;
332			int delta_poc[2];
333			int curr_pic_num;
334			int max_pic_num;
335			} H264SliceContext;
336
337			/**
338			* H264Context
339			*/
340			typedef struct H264Context {
341			const AVClass *class;
342			AVCodecContext *avctx;
343			VideoDSPContext vdsp;
344			H264DSPContext h264dsp;
345			H264ChromaContext h264chroma;
346			H264QpelContext h264qpel;
347			H274FilmGrainDatabase h274db;
348
349			H264Picture DPB[H264_MAX_PICTURE_COUNT];
350			H264Picture *cur_pic_ptr;
351			H264Picture cur_pic;
352			H264Picture last_pic_for_ec;
353
354			H264SliceContext *slice_ctx;
355			int nb_slice_ctx;
356			int nb_slice_ctx_queued;
357
358			H2645Packet pkt;
359
360			int pixel_shift; ///< 0 for 8-bit H.264, 1 for high-bit-depth H.264
361
362			/* coded dimensions -- 16 * mb w/h */
363			int width, height;
364			int chroma_x_shift, chroma_y_shift;
365
366			int droppable;
367
368			int context_initialized;
369			int flags;
370			int workaround_bugs;
371			int x264_build;
372			/* Set when slice threading is used and at least one slice uses deblocking
373			* mode 1 (i.e. across slice boundaries). Then we disable the loop filter
374			* during normal MB decoding and execute it serially at the end.
375			*/
376			int postpone_filter;
377
378			/*
379			* Set to 1 when the current picture is IDR, 0 otherwise.
380			*/
381			int picture_idr;
382
383			/*
384			* Set to 1 when the current picture contains only I slices, 0 otherwise.
385			*/
386			int picture_intra_only;
387
388			int crop_left;
389			int crop_right;
390			int crop_top;
391			int crop_bottom;
392
393			int8_t(*intra4x4_pred_mode);
394			H264PredContext hpc;
395
396			uint8_t (*non_zero_count)[48];
397
398			#define LIST_NOT_USED -1 // FIXME rename?
399
400			/**
401			* block_offset[ 0..23] for frame macroblocks
402			* block_offset[24..47] for field macroblocks
403			*/
404			int block_offset[2 * (16 * 3)];
405
406			uint32_t *mb2b_xy; // FIXME are these 4 a good idea?
407			uint32_t *mb2br_xy;
408			int b_stride; // FIXME use s->b4_stride
409
410			uint16_t *slice_table; ///< slice_table_base + 2*mb_stride + 1
411
412			// interlacing specific flags
413			int mb_aff_frame;
414			int picture_structure;
415			int first_field;
416
417			uint8_t *list_counts; ///< Array of list_count per MB specifying the slice type
418
419			/* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0, 1, 2), 0x0? luma_cbp */
420			uint16_t *cbp_table;
421
422			/* chroma_pred_mode for i4x4 or i16x16, else 0 */
423			uint8_t *chroma_pred_mode_table;
424			uint8_t (*mvd_table[2])[2];
425			uint8_t *direct_table;
426
427			uint8_t scan_padding[16];
428			uint8_t zigzag_scan[16];
429			uint8_t zigzag_scan8x8[64];
430			uint8_t zigzag_scan8x8_cavlc[64];
431			uint8_t field_scan[16];
432			uint8_t field_scan8x8[64];
433			uint8_t field_scan8x8_cavlc[64];
434			uint8_t zigzag_scan_q0[16];
435			uint8_t zigzag_scan8x8_q0[64];
436			uint8_t zigzag_scan8x8_cavlc_q0[64];
437			uint8_t field_scan_q0[16];
438			uint8_t field_scan8x8_q0[64];
439			uint8_t field_scan8x8_cavlc_q0[64];
440
441			int mb_y;
442			int mb_height, mb_width;
443			int mb_stride;
444			int mb_num;
445
446			// =============================================================
447			// Things below are not used in the MB or more inner code
448
449			int nal_ref_idc;
450			int nal_unit_type;
451
452			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()
453
454			/**
455			* Used to parse AVC variant of H.264
456			*/
457			int is_avc; ///< this flag is != 0 if codec is avc1
458			int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
459
460			int bit_depth_luma; ///< luma bit depth from sps to detect changes
461			int chroma_format_idc; ///< chroma format from sps to detect changes
462
463			H264ParamSets ps;
464
465			uint16_t *slice_table_base;
466
467			H264POCContext poc;
468
469			H264Ref default_ref[2];
470			H264Picture *short_ref[32];
471			H264Picture *long_ref[32];
472			H264Picture *delayed_pic[H264_MAX_DPB_FRAMES + 2]; // FIXME size?
473			int last_pocs[H264_MAX_DPB_FRAMES];
474			H264Picture *next_output_pic;
475			int next_outputed_poc;
476			int poc_offset; ///< PicOrderCnt_offset from SMPTE RDD-2006
477
478			/**
479			* memory management control operations buffer.
480			*/
481			MMCO mmco[H264_MAX_MMCO_COUNT];
482			int nb_mmco;
483			int mmco_reset;
484			int explicit_ref_marking;
485
486			int long_ref_count; ///< number of actual long term references
487			int short_ref_count; ///< number of actual short term references
488
489			/**
490			* @name Members for slice based multithreading
491			* @{
492			*/
493			/**
494			* current slice number, used to initialize slice_num of each thread/context
495			*/
496			int current_slice;
497
498			/** @} */
499
500			/**
501			* Complement sei_pic_struct
502			* SEI_PIC_STRUCT_TOP_BOTTOM and SEI_PIC_STRUCT_BOTTOM_TOP indicate interlaced frames.
503			* However, soft telecined frames may have these values.
504			* This is used in an attempt to flag soft telecine progressive.
505			*/
506			int prev_interlaced_frame;
507
508			/**
509			* Are the SEI recovery points looking valid.
510			*/
511			int valid_recovery_point;
512
513			/**
514			* recovery_frame is the frame_num at which the next frame should
515			* be fully constructed.
516			*
517			* Set to -1 when not expecting a recovery point.
518			*/
519			int recovery_frame;
520
521			/**
522			* We have seen an IDR, so all the following frames in coded order are correctly
523			* decodable.
524			*/
525			#define FRAME_RECOVERED_IDR (1 << 0)
526			/**
527			* Sufficient number of frames have been decoded since a SEI recovery point,
528			* so all the following frames in presentation order are correct.
529			*/
530			#define FRAME_RECOVERED_SEI (1 << 1)
531			/**
532			* Recovery point detected by heuristic
533			*/
534			#define FRAME_RECOVERED_HEURISTIC (1 << 2)
535
536			/**
537			* Initial frame has been completely recovered.
538			*
539			* Once this is set, all following decoded as well as displayed frames will be marked as recovered
540			* If a frame is marked as recovered frame_recovered will be set once this frame is output and thus
541			* all subsequently output fraames are also marked as recovered
542			*
543			* In effect, if you want all subsequent DECODED frames marked as recovered, set frame_recovered
544			* If you want all subsequent DISPAYED frames marked as recovered, set the frame->recovered
545			*/
546			int frame_recovered;
547
548			int has_recovery_point;
549
550			int missing_fields;
551
552			/* for frame threading, this is set to 1
553			* after finish_setup() has been called, so we cannot modify
554			* some context properties (which are supposed to stay constant between
555			* slices) anymore */
556			int setup_finished;
557
558			int cur_chroma_format_idc;
559			int cur_bit_depth_luma;
560			int16_t slice_row[MAX_SLICES]; ///< to detect when MAX_SLICES is too low
561
562			/* original AVCodecContext dimensions, used to handle container
563			* cropping */
564			int width_from_caller;
565			int height_from_caller;
566
567			int enable_er;
568			ERContext er;
569			int16_t *dc_val_base;
570
571			H264SEIContext sei;
572
573			struct FFRefStructPool *qscale_table_pool;
574			struct FFRefStructPool *mb_type_pool;
575			struct FFRefStructPool *motion_val_pool;
576			struct FFRefStructPool *ref_index_pool;
577			struct FFRefStructPool *decode_error_flags_pool;
578			int ref2frm[MAX_SLICES][2][64]; ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1
579
580			int non_gray; ///< Did we encounter a intra frame after a gray gap frame
581			int noref_gray;
582			int skip_gray;
583			} H264Context;
584
585			extern const uint16_t ff_h264_mb_sizes[4];
586
587			/**
588			* Reconstruct bitstream slice_type.
589			*/
590			int ff_h264_get_slice_type(const H264SliceContext *sl);
591
592			/**
593			* Allocate tables.
594			* needs width/height
595			*/
596			int ff_h264_alloc_tables(H264Context *h);
597
598			int ff_h264_decode_ref_pic_list_reordering(H264SliceContext *sl, void *logctx);
599			int ff_h264_build_ref_list(H264Context *h, H264SliceContext *sl);
600			void ff_h264_remove_all_refs(H264Context *h);
601
602			/**
603			* Execute the reference picture marking (memory management control operations).
604			*/
605			int ff_h264_execute_ref_pic_marking(H264Context *h);
606
607			int ff_h264_decode_ref_pic_marking(H264SliceContext *sl, GetBitContext *gb,
608			const H2645NAL *nal, void *logctx);
609
610			void ff_h264_hl_decode_mb(const H264Context *h, H264SliceContext *sl);
611			void ff_h264_decode_init_vlc(void);
612
613			/**
614			* Decode a macroblock
615			* @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
616			*/
617			int ff_h264_decode_mb_cavlc(const H264Context *h, H264SliceContext *sl);
618
619			/**
620			* Decode a CABAC coded macroblock
621			* @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
622			*/
623			int ff_h264_decode_mb_cabac(const H264Context *h, H264SliceContext *sl);
624
625			void ff_h264_init_cabac_states(const H264Context *h, H264SliceContext *sl);
626
627			void ff_h264_direct_dist_scale_factor(const H264Context *const h, H264SliceContext *sl);
628			void ff_h264_direct_ref_list_init(const H264Context *const h, H264SliceContext *sl);
629			void ff_h264_pred_direct_motion(const H264Context *const h, H264SliceContext *sl,
630			int *mb_type);
631
632			void ff_h264_filter_mb_fast(const H264Context *h, H264SliceContext *sl, int mb_x, int mb_y,
633			uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
634			unsigned int linesize, unsigned int uvlinesize);
635			void ff_h264_filter_mb(const H264Context *h, H264SliceContext *sl, int mb_x, int mb_y,
636			uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
637			unsigned int linesize, unsigned int uvlinesize);
638
639			/*
640			* o-o o-o
641			* / / /
642			* o-o o-o
643			* ,---'
644			* o-o o-o
645			* / / /
646			* o-o o-o
647			*/
648
649			/* Scan8 organization:
650			* 0 1 2 3 4 5 6 7
651			* 0 DY y y y y y
652			* 1 y Y Y Y Y
653			* 2 y Y Y Y Y
654			* 3 y Y Y Y Y
655			* 4 y Y Y Y Y
656			* 5 DU u u u u u
657			* 6 u U U U U
658			* 7 u U U U U
659			* 8 u U U U U
660			* 9 u U U U U
661			* 10 DV v v v v v
662			* 11 v V V V V
663			* 12 v V V V V
664			* 13 v V V V V
665			* 14 v V V V V
666			* DY/DU/DV are for luma/chroma DC.
667			*/
668
669			#define LUMA_DC_BLOCK_INDEX 48
670			#define CHROMA_DC_BLOCK_INDEX 49
671
672			/**
673			* Get the chroma qp.
674			*/
675		63943130	static av_always_inline int get_chroma_qp(const PPS *pps, int t, int qscale)
676			{
677		63943130	return pps->chroma_qp_table[t][qscale];
678			}
679
680			int ff_h264_field_end(H264Context *h, H264SliceContext *sl, int in_setup);
681
682			int ff_h264_ref_picture(H264Picture *dst, const H264Picture *src);
683			int ff_h264_replace_picture(H264Picture *dst, const H264Picture *src);
684			void ff_h264_unref_picture(H264Picture *pic);
685
686			void ff_h264_slice_context_init(H264Context *h, H264SliceContext *sl);
687
688			void ff_h264_draw_horiz_band(const H264Context *h, H264SliceContext *sl, int y, int height);
689
690			/**
691			* Submit a slice for decoding.
692			*
693			* Parse the slice header, starting a new field/frame if necessary. If any
694			* slices are queued for the previous field, they are decoded.
695			*/
696			int ff_h264_queue_decode_slice(H264Context *h, const H2645NAL *nal);
697			int ff_h264_execute_decode_slices(H264Context *h);
698			int ff_h264_update_thread_context(AVCodecContext *dst,
699			const AVCodecContext *src);
700			int ff_h264_update_thread_context_for_user(AVCodecContext *dst,
701			const AVCodecContext *src);
702
703			void ff_h264_flush_change(H264Context *h);
704
705			void ff_h264_free_tables(H264Context *h);
706
707			void ff_h264_set_erpic(ERPicture *dst, const H264Picture *src);
708
709			#endif /* AVCODEC_H264DEC_H */
710