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
97			/**
98			* Memory management control operation.
99			*/
100			typedef struct MMCO {
101			MMCOOpcode opcode;
102			int short_pic_num; ///< pic_num without wrapping (pic_num & max_pic_num)
103			int long_arg; ///< index, pic_num, or num long refs depending on opcode
104			} MMCO;
105
106			typedef struct H264Picture {
107			AVFrame *f;
108			ThreadFrame tf;
109
110			AVFrame *f_grain;
111
112			int8_t *qscale_table_base; ///< RefStruct reference
113			int8_t *qscale_table;
114
115			int16_t (*motion_val_base[2])[2]; ///< RefStruct reference
116			int16_t (*motion_val[2])[2];
117
118			uint32_t *mb_type_base; ///< RefStruct reference
119			uint32_t *mb_type;
120
121			/// RefStruct reference for hardware accelerator private data
122			void *hwaccel_picture_private;
123
124			int8_t *ref_index[2]; ///< RefStruct reference
125
126			int field_poc[2]; ///< top/bottom POC
127			int poc; ///< frame POC
128			int frame_num; ///< frame_num (raw frame_num from slice header)
129			int mmco_reset; /**< MMCO_RESET set this 1. Reordering code must
130			not mix pictures before and after MMCO_RESET. */
131			int pic_id; /**< pic_num (short -> no wrap version of pic_num,
132			pic_num & max_pic_num; long -> long_pic_num) */
133			int long_ref; ///< 1->long term reference 0->short term reference
134			int ref_poc[2][2][32]; ///< POCs of the frames/fields used as reference (FIXME need per slice)
135			int ref_count[2][2]; ///< number of entries in ref_poc (FIXME need per slice)
136			int mbaff; ///< 1 -> MBAFF frame 0-> not MBAFF
137			int field_picture; ///< whether or not picture was encoded in separate fields
138
139			/**
140			* H264Picture.reference has this flag set,
141			* when the picture is held for delayed output.
142			*/
143			#define DELAYED_PIC_REF (1 << 2)
144			int reference;
145			int recovered; ///< picture at IDR or recovery point + recovery count
146			int invalid_gap;
147			int sei_recovery_frame_cnt;
148			int needs_fg; ///< whether picture needs film grain synthesis (see `f_grain`)
149
150			const PPS *pps;
151
152			int mb_width, mb_height;
153			int mb_stride;
154
155			/// RefStruct reference; its pointee is shared between decoding threads.
156			atomic_int *decode_error_flags;
157
158			int gray;
159			} H264Picture;
160
161			typedef struct H264Ref {
162			uint8_t *data[3];
163			int linesize[3];
164
165			int reference;
166			int poc;
167			int pic_id;
168
169			const H264Picture *parent;
170			} H264Ref;
171
172			typedef struct H264SliceContext {
173			const struct H264Context *h264;
174			GetBitContext gb;
175			ERContext *er;
176
177			int slice_num;
178			int slice_type;
179			int slice_type_nos; ///< S free slice type (SI/SP are remapped to I/P)
180			int slice_type_fixed;
181
182			int qscale;
183			int chroma_qp[2]; // QPc
184			int qp_thresh; ///< QP threshold to skip loopfilter
185			int last_qscale_diff;
186
187			// deblock
188			int deblocking_filter; ///< disable_deblocking_filter_idc with 1 <-> 0
189			int slice_alpha_c0_offset;
190			int slice_beta_offset;
191
192			H264PredWeightTable pwt;
193
194			int prev_mb_skipped;
195			int next_mb_skipped;
196
197			int chroma_pred_mode;
198			int intra16x16_pred_mode;
199
200			int8_t intra4x4_pred_mode_cache[5 * 8];
201			int8_t(*intra4x4_pred_mode);
202
203			int topleft_mb_xy;
204			int top_mb_xy;
205			int topright_mb_xy;
206			int left_mb_xy[LEFT_MBS];
207
208			int topleft_type;
209			int top_type;
210			int topright_type;
211			int left_type[LEFT_MBS];
212
213			const uint8_t *left_block;
214			int topleft_partition;
215
216			unsigned int topleft_samples_available;
217			unsigned int top_samples_available;
218			unsigned int topright_samples_available;
219			unsigned int left_samples_available;
220
221			ptrdiff_t linesize, uvlinesize;
222			ptrdiff_t mb_linesize; ///< may be equal to s->linesize or s->linesize * 2, for mbaff
223			ptrdiff_t mb_uvlinesize;
224
225			int mb_x, mb_y;
226			int mb_xy;
227			int resync_mb_x;
228			int resync_mb_y;
229			unsigned int first_mb_addr;
230			// index of the first MB of the next slice
231			int next_slice_idx;
232			int mb_skip_run;
233			int is_complex;
234
235			int picture_structure;
236			int mb_field_decoding_flag;
237			int mb_mbaff; ///< mb_aff_frame && mb_field_decoding_flag
238
239			int redundant_pic_count;
240
241			/**
242			* number of neighbors (top and/or left) that used 8x8 dct
243			*/
244			int neighbor_transform_size;
245
246			int direct_spatial_mv_pred;
247			int col_parity;
248			int col_fieldoff;
249
250			int cbp;
251			int top_cbp;
252			int left_cbp;
253
254			int dist_scale_factor[32];
255			int dist_scale_factor_field[2][32];
256			int map_col_to_list0[2][16 + 32];
257			int map_col_to_list0_field[2][2][16 + 32];
258
259			/**
260			* num_ref_idx_l0/1_active_minus1 + 1
261			*/
262			unsigned int ref_count[2]; ///< counts frames or fields, depending on current mb mode
263			unsigned int list_count;
264			H264Ref ref_list[2][48]; /**< 0..15: frame refs, 16..47: mbaff field refs.
265			* Reordered version of default_ref_list
266			* according to picture reordering in slice header */
267			struct {
268			uint8_t op;
269			uint32_t val;
270			} ref_modifications[2][32];
271			int nb_ref_modifications[2];
272
273			unsigned int pps_id;
274
275			const uint8_t *intra_pcm_ptr;
276
277			uint8_t *bipred_scratchpad;
278			uint8_t *edge_emu_buffer;
279			uint8_t (*top_borders[2])[(16 * 3) * 2];
280			int bipred_scratchpad_allocated;
281			int edge_emu_buffer_allocated;
282			int top_borders_allocated[2];
283
284			/**
285			* non zero coeff count cache.
286			* is 64 if not available.
287			*/
288			DECLARE_ALIGNED(8, uint8_t, non_zero_count_cache)[15 * 8];
289
290			/**
291			* Motion vector cache.
292			*/
293			DECLARE_ALIGNED(16, int16_t, mv_cache)[2][5 * 8][2];
294			DECLARE_ALIGNED(8, int8_t, ref_cache)[2][5 * 8];
295			DECLARE_ALIGNED(16, uint8_t, mvd_cache)[2][5 * 8][2];
296			uint8_t direct_cache[5 * 8];
297
298			DECLARE_ALIGNED(8, uint16_t, sub_mb_type)[4];
299
300			///< as a DCT coefficient is int32_t in high depth, we need to reserve twice the space.
301			DECLARE_ALIGNED(16, int16_t, mb)[16 * 48 * 2];
302			DECLARE_ALIGNED(16, int16_t, mb_luma_dc)[3][16 * 2];
303			///< as mb is addressed by scantable[i] and scantable is uint8_t we can either
304			///< check that i is not too large or ensure that there is some unused stuff after mb
305			int16_t mb_padding[256 * 2];
306
307			uint8_t (*mvd_table[2])[2];
308
309			/**
310			* Cabac
311			*/
312			CABACContext cabac;
313			uint8_t cabac_state[1024];
314			int cabac_init_idc;
315
316			MMCO mmco[H264_MAX_MMCO_COUNT];
317			int nb_mmco;
318			int explicit_ref_marking;
319
320			int frame_num;
321			int idr_pic_id;
322			int poc_lsb;
323			int delta_poc_bottom;
324			int delta_poc[2];
325			int curr_pic_num;
326			int max_pic_num;
327			} H264SliceContext;
328
329			/**
330			* H264Context
331			*/
332			typedef struct H264Context {
333			const AVClass *class;
334			AVCodecContext *avctx;
335			VideoDSPContext vdsp;
336			H264DSPContext h264dsp;
337			H264ChromaContext h264chroma;
338			H264QpelContext h264qpel;
339			H274FilmGrainDatabase h274db;
340
341			H264Picture DPB[H264_MAX_PICTURE_COUNT];
342			H264Picture *cur_pic_ptr;
343			H264Picture cur_pic;
344			H264Picture last_pic_for_ec;
345
346			H264SliceContext *slice_ctx;
347			int nb_slice_ctx;
348			int nb_slice_ctx_queued;
349
350			H2645Packet pkt;
351
352			int pixel_shift; ///< 0 for 8-bit H.264, 1 for high-bit-depth H.264
353
354			/* coded dimensions -- 16 * mb w/h */
355			int width, height;
356			int chroma_x_shift, chroma_y_shift;
357
358			int droppable;
359			int coded_picture_number;
360
361			int context_initialized;
362			int flags;
363			int workaround_bugs;
364			int x264_build;
365			/* Set when slice threading is used and at least one slice uses deblocking
366			* mode 1 (i.e. across slice boundaries). Then we disable the loop filter
367			* during normal MB decoding and execute it serially at the end.
368			*/
369			int postpone_filter;
370
371			/*
372			* Set to 1 when the current picture is IDR, 0 otherwise.
373			*/
374			int picture_idr;
375
376			/*
377			* Set to 1 when the current picture contains only I slices, 0 otherwise.
378			*/
379			int picture_intra_only;
380
381			int crop_left;
382			int crop_right;
383			int crop_top;
384			int crop_bottom;
385
386			int8_t(*intra4x4_pred_mode);
387			H264PredContext hpc;
388
389			uint8_t (*non_zero_count)[48];
390
391			#define LIST_NOT_USED -1 // FIXME rename?
392
393			/**
394			* block_offset[ 0..23] for frame macroblocks
395			* block_offset[24..47] for field macroblocks
396			*/
397			int block_offset[2 * (16 * 3)];
398
399			uint32_t *mb2b_xy; // FIXME are these 4 a good idea?
400			uint32_t *mb2br_xy;
401			int b_stride; // FIXME use s->b4_stride
402
403			uint16_t *slice_table; ///< slice_table_base + 2*mb_stride + 1
404
405			// interlacing specific flags
406			int mb_aff_frame;
407			int picture_structure;
408			int first_field;
409
410			uint8_t *list_counts; ///< Array of list_count per MB specifying the slice type
411
412			/* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0, 1, 2), 0x0? luma_cbp */
413			uint16_t *cbp_table;
414
415			/* chroma_pred_mode for i4x4 or i16x16, else 0 */
416			uint8_t *chroma_pred_mode_table;
417			uint8_t (*mvd_table[2])[2];
418			uint8_t *direct_table;
419
420			uint8_t scan_padding[16];
421			uint8_t zigzag_scan[16];
422			uint8_t zigzag_scan8x8[64];
423			uint8_t zigzag_scan8x8_cavlc[64];
424			uint8_t field_scan[16];
425			uint8_t field_scan8x8[64];
426			uint8_t field_scan8x8_cavlc[64];
427			uint8_t zigzag_scan_q0[16];
428			uint8_t zigzag_scan8x8_q0[64];
429			uint8_t zigzag_scan8x8_cavlc_q0[64];
430			uint8_t field_scan_q0[16];
431			uint8_t field_scan8x8_q0[64];
432			uint8_t field_scan8x8_cavlc_q0[64];
433
434			int mb_y;
435			int mb_height, mb_width;
436			int mb_stride;
437			int mb_num;
438
439			// =============================================================
440			// Things below are not used in the MB or more inner code
441
442			int nal_ref_idc;
443			int nal_unit_type;
444
445			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()
446
447			/**
448			* Used to parse AVC variant of H.264
449			*/
450			int is_avc; ///< this flag is != 0 if codec is avc1
451			int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
452
453			int bit_depth_luma; ///< luma bit depth from sps to detect changes
454			int chroma_format_idc; ///< chroma format from sps to detect changes
455
456			H264ParamSets ps;
457
458			uint16_t *slice_table_base;
459
460			H264POCContext poc;
461
462			H264Ref default_ref[2];
463			H264Picture *short_ref[32];
464			H264Picture *long_ref[32];
465			H264Picture *delayed_pic[H264_MAX_DPB_FRAMES + 2]; // FIXME size?
466			int last_pocs[H264_MAX_DPB_FRAMES];
467			H264Picture *next_output_pic;
468			int next_outputed_poc;
469			int poc_offset; ///< PicOrderCnt_offset from SMPTE RDD-2006
470
471			/**
472			* memory management control operations buffer.
473			*/
474			MMCO mmco[H264_MAX_MMCO_COUNT];
475			int nb_mmco;
476			int mmco_reset;
477			int explicit_ref_marking;
478
479			int long_ref_count; ///< number of actual long term references
480			int short_ref_count; ///< number of actual short term references
481
482			/**
483			* @name Members for slice based multithreading
484			* @{
485			*/
486			/**
487			* current slice number, used to initialize slice_num of each thread/context
488			*/
489			int current_slice;
490
491			/** @} */
492
493			/**
494			* Complement sei_pic_struct
495			* SEI_PIC_STRUCT_TOP_BOTTOM and SEI_PIC_STRUCT_BOTTOM_TOP indicate interlaced frames.
496			* However, soft telecined frames may have these values.
497			* This is used in an attempt to flag soft telecine progressive.
498			*/
499			int prev_interlaced_frame;
500
501			/**
502			* Are the SEI recovery points looking valid.
503			*/
504			int valid_recovery_point;
505
506			/**
507			* recovery_frame is the frame_num at which the next frame should
508			* be fully constructed.
509			*
510			* Set to -1 when not expecting a recovery point.
511			*/
512			int recovery_frame;
513
514			/**
515			* We have seen an IDR, so all the following frames in coded order are correctly
516			* decodable.
517			*/
518			#define FRAME_RECOVERED_IDR (1 << 0)
519			/**
520			* Sufficient number of frames have been decoded since a SEI recovery point,
521			* so all the following frames in presentation order are correct.
522			*/
523			#define FRAME_RECOVERED_SEI (1 << 1)
524			/**
525			* Recovery point detected by heuristic
526			*/
527			#define FRAME_RECOVERED_HEURISTIC (1 << 2)
528
529			/**
530			* Initial frame has been completely recovered.
531			*
532			* Once this is set, all following decoded as well as displayed frames will be marked as recovered
533			* If a frame is marked as recovered frame_recovered will be set once this frame is output and thus
534			* all subsequently output fraames are also marked as recovered
535			*
536			* In effect, if you want all subsequent DECODED frames marked as recovered, set frame_recovered
537			* If you want all subsequent DISPAYED frames marked as recovered, set the frame->recovered
538			*/
539			int frame_recovered;
540
541			int has_recovery_point;
542
543			int missing_fields;
544
545			/* for frame threading, this is set to 1
546			* after finish_setup() has been called, so we cannot modify
547			* some context properties (which are supposed to stay constant between
548			* slices) anymore */
549			int setup_finished;
550
551			int cur_chroma_format_idc;
552			int cur_bit_depth_luma;
553			int16_t slice_row[MAX_SLICES]; ///< to detect when MAX_SLICES is too low
554
555			/* original AVCodecContext dimensions, used to handle container
556			* cropping */
557			int width_from_caller;
558			int height_from_caller;
559
560			int enable_er;
561			ERContext er;
562			int16_t *dc_val_base;
563
564			H264SEIContext sei;
565
566			struct FFRefStructPool *qscale_table_pool;
567			struct FFRefStructPool *mb_type_pool;
568			struct FFRefStructPool *motion_val_pool;
569			struct FFRefStructPool *ref_index_pool;
570			struct FFRefStructPool *decode_error_flags_pool;
571			int ref2frm[MAX_SLICES][2][64]; ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1
572
573			int non_gray; ///< Did we encounter a intra frame after a gray gap frame
574			int noref_gray;
575			int skip_gray;
576			} H264Context;
577
578			extern const uint16_t ff_h264_mb_sizes[4];
579
580			/**
581			* Reconstruct bitstream slice_type.
582			*/
583			int ff_h264_get_slice_type(const H264SliceContext *sl);
584
585			/**
586			* Allocate tables.
587			* needs width/height
588			*/
589			int ff_h264_alloc_tables(H264Context *h);
590
591			int ff_h264_decode_ref_pic_list_reordering(H264SliceContext *sl, void *logctx);
592			int ff_h264_build_ref_list(H264Context *h, H264SliceContext *sl);
593			void ff_h264_remove_all_refs(H264Context *h);
594
595			/**
596			* Execute the reference picture marking (memory management control operations).
597			*/
598			int ff_h264_execute_ref_pic_marking(H264Context *h);
599
600			int ff_h264_decode_ref_pic_marking(H264SliceContext *sl, GetBitContext *gb,
601			const H2645NAL *nal, void *logctx);
602
603			void ff_h264_hl_decode_mb(const H264Context *h, H264SliceContext *sl);
604			void ff_h264_decode_init_vlc(void);
605
606			/**
607			* Decode a macroblock
608			* @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
609			*/
610			int ff_h264_decode_mb_cavlc(const H264Context *h, H264SliceContext *sl);
611
612			/**
613			* Decode a CABAC coded macroblock
614			* @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
615			*/
616			int ff_h264_decode_mb_cabac(const H264Context *h, H264SliceContext *sl);
617
618			void ff_h264_init_cabac_states(const H264Context *h, H264SliceContext *sl);
619
620			void ff_h264_direct_dist_scale_factor(const H264Context *const h, H264SliceContext *sl);
621			void ff_h264_direct_ref_list_init(const H264Context *const h, H264SliceContext *sl);
622			void ff_h264_pred_direct_motion(const H264Context *const h, H264SliceContext *sl,
623			int *mb_type);
624
625			void ff_h264_filter_mb_fast(const H264Context *h, H264SliceContext *sl, int mb_x, int mb_y,
626			uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
627			unsigned int linesize, unsigned int uvlinesize);
628			void ff_h264_filter_mb(const H264Context *h, H264SliceContext *sl, int mb_x, int mb_y,
629			uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
630			unsigned int linesize, unsigned int uvlinesize);
631
632			/*
633			* o-o o-o
634			* / / /
635			* o-o o-o
636			* ,---'
637			* o-o o-o
638			* / / /
639			* o-o o-o
640			*/
641
642			/* Scan8 organization:
643			* 0 1 2 3 4 5 6 7
644			* 0 DY y y y y y
645			* 1 y Y Y Y Y
646			* 2 y Y Y Y Y
647			* 3 y Y Y Y Y
648			* 4 y Y Y Y Y
649			* 5 DU u u u u u
650			* 6 u U U U U
651			* 7 u U U U U
652			* 8 u U U U U
653			* 9 u U U U U
654			* 10 DV v v v v v
655			* 11 v V V V V
656			* 12 v V V V V
657			* 13 v V V V V
658			* 14 v V V V V
659			* DY/DU/DV are for luma/chroma DC.
660			*/
661
662			#define LUMA_DC_BLOCK_INDEX 48
663			#define CHROMA_DC_BLOCK_INDEX 49
664
665			/**
666			* Get the chroma qp.
667			*/
668		63937254	static av_always_inline int get_chroma_qp(const PPS *pps, int t, int qscale)
669			{
670		63937254	return pps->chroma_qp_table[t][qscale];
671			}
672
673			int ff_h264_field_end(H264Context *h, H264SliceContext *sl, int in_setup);
674
675			int ff_h264_ref_picture(H264Picture *dst, const H264Picture *src);
676			int ff_h264_replace_picture(H264Picture *dst, const H264Picture *src);
677			void ff_h264_unref_picture(H264Picture *pic);
678
679			void ff_h264_slice_context_init(H264Context *h, H264SliceContext *sl);
680
681			void ff_h264_draw_horiz_band(const H264Context *h, H264SliceContext *sl, int y, int height);
682
683			/**
684			* Submit a slice for decoding.
685			*
686			* Parse the slice header, starting a new field/frame if necessary. If any
687			* slices are queued for the previous field, they are decoded.
688			*/
689			int ff_h264_queue_decode_slice(H264Context *h, const H2645NAL *nal);
690			int ff_h264_execute_decode_slices(H264Context *h);
691			int ff_h264_update_thread_context(AVCodecContext *dst,
692			const AVCodecContext *src);
693			int ff_h264_update_thread_context_for_user(AVCodecContext *dst,
694			const AVCodecContext *src);
695
696			void ff_h264_flush_change(H264Context *h);
697
698			void ff_h264_free_tables(H264Context *h);
699
700			void ff_h264_set_erpic(ERPicture *dst, const H264Picture *src);
701
702			#endif /* AVCODEC_H264DEC_H */
703