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/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			int slice_num;
184			int slice_type;
185			int slice_type_nos; ///< S free slice type (SI/SP are remapped to I/P)
186			int slice_type_fixed;
187
188			int qscale;
189			int chroma_qp[2]; // QPc
190			int qp_thresh; ///< QP threshold to skip loopfilter
191			int last_qscale_diff;
192
193			// deblock
194			int deblocking_filter; ///< disable_deblocking_filter_idc with 1 <-> 0
195			int slice_alpha_c0_offset;
196			int slice_beta_offset;
197
198			H264PredWeightTable pwt;
199
200			int prev_mb_skipped;
201			int next_mb_skipped;
202
203			int chroma_pred_mode;
204			int intra16x16_pred_mode;
205
206			int8_t intra4x4_pred_mode_cache[5 * 8];
207			int8_t(*intra4x4_pred_mode);
208
209			int topleft_mb_xy;
210			int top_mb_xy;
211			int topright_mb_xy;
212			int left_mb_xy[LEFT_MBS];
213
214			int topleft_type;
215			int top_type;
216			int topright_type;
217			int left_type[LEFT_MBS];
218
219			const uint8_t *left_block;
220			int topleft_partition;
221
222			unsigned int topleft_samples_available;
223			unsigned int top_samples_available;
224			unsigned int topright_samples_available;
225			unsigned int left_samples_available;
226
227			ptrdiff_t linesize, uvlinesize;
228			ptrdiff_t mb_linesize; ///< may be equal to s->linesize or s->linesize * 2, for mbaff
229			ptrdiff_t mb_uvlinesize;
230
231			int mb_x, mb_y;
232			int mb_xy;
233			int resync_mb_x;
234			int resync_mb_y;
235			unsigned int first_mb_addr;
236			// index of the first MB of the next slice
237			int next_slice_idx;
238			int mb_skip_run;
239			int is_complex;
240
241			int picture_structure;
242			int mb_field_decoding_flag;
243			int mb_mbaff; ///< mb_aff_frame && mb_field_decoding_flag
244
245			int redundant_pic_count;
246
247			/**
248			* number of neighbors (top and/or left) that used 8x8 dct
249			*/
250			int neighbor_transform_size;
251
252			int direct_spatial_mv_pred;
253			int col_parity;
254			int col_fieldoff;
255
256			int cbp;
257			int top_cbp;
258			int left_cbp;
259
260			int dist_scale_factor[32];
261			int dist_scale_factor_field[2][32];
262			int map_col_to_list0[2][16 + 32];
263			int map_col_to_list0_field[2][2][16 + 32];
264
265			/**
266			* num_ref_idx_l0/1_active_minus1 + 1
267			*/
268			unsigned int ref_count[2]; ///< counts frames or fields, depending on current mb mode
269			unsigned int list_count;
270			H264Ref ref_list[2][48]; /**< 0..15: frame refs, 16..47: mbaff field refs.
271			* Reordered version of default_ref_list
272			* according to picture reordering in slice header */
273			struct {
274			uint8_t op;
275			uint32_t val;
276			} ref_modifications[2][32];
277			int nb_ref_modifications[2];
278
279			unsigned int pps_id;
280
281			const uint8_t *intra_pcm_ptr;
282
283			uint8_t *bipred_scratchpad;
284			uint8_t *edge_emu_buffer;
285			uint8_t (*top_borders[2])[(16 * 3) * 2];
286			int bipred_scratchpad_allocated;
287			int edge_emu_buffer_allocated;
288			int top_borders_allocated[2];
289
290			/**
291			* non zero coeff count cache.
292			* is 64 if not available.
293			*/
294			DECLARE_ALIGNED(8, uint8_t, non_zero_count_cache)[15 * 8];
295
296			/**
297			* Motion vector cache.
298			*/
299			DECLARE_ALIGNED(16, int16_t, mv_cache)[2][5 * 8][2];
300			DECLARE_ALIGNED(8, int8_t, ref_cache)[2][5 * 8];
301			DECLARE_ALIGNED(16, uint8_t, mvd_cache)[2][5 * 8][2];
302			uint8_t direct_cache[5 * 8];
303
304			DECLARE_ALIGNED(8, uint16_t, sub_mb_type)[4];
305
306			/// as a DCT coefficient is int32_t in high depth, we need to reserve twice the space.
307			DECLARE_ALIGNED(16, int16_t, mb)[16 * 48 * 2];
308			DECLARE_ALIGNED(16, int16_t, mb_luma_dc)[3][16 * 2];
309			/// as mb is addressed by scantable[i] and scantable is uint8_t we can either
310			/// check that i is not too large or ensure that there is some unused stuff after mb
311			int16_t mb_padding[256 * 2];
312
313			uint8_t (*mvd_table[2])[2];
314
315			/**
316			* Cabac
317			*/
318			CABACContext cabac;
319			uint8_t cabac_state[1024];
320			int cabac_init_idc;
321
322			MMCO mmco[H264_MAX_MMCO_COUNT];
323			int nb_mmco;
324			int explicit_ref_marking;
325
326			int frame_num;
327			int idr_pic_id;
328			int poc_lsb;
329			int delta_poc_bottom;
330			int delta_poc[2];
331			int curr_pic_num;
332			int max_pic_num;
333			} H264SliceContext;
334
335			/**
336			* H264Context
337			*/
338			typedef struct H264Context {
339			const AVClass *class;
340			AVCodecContext *avctx;
341			VideoDSPContext vdsp;
342			H264DSPContext h264dsp;
343			H264ChromaContext h264chroma;
344			H264QpelContext h264qpel;
345
346			H264Picture DPB[H264_MAX_PICTURE_COUNT];
347			H264Picture *cur_pic_ptr;
348			H264Picture cur_pic;
349			H264Picture last_pic_for_ec;
350
351			H264SliceContext *slice_ctx;
352			int nb_slice_ctx;
353			int nb_slice_ctx_queued;
354
355			H2645Packet pkt;
356
357			int pixel_shift; ///< 0 for 8-bit H.264, 1 for high-bit-depth H.264
358
359			/* coded dimensions -- 16 * mb w/h */
360			int width, height;
361			int chroma_x_shift, chroma_y_shift;
362
363			int droppable;
364
365			int context_initialized;
366			int flags;
367			int workaround_bugs;
368			int x264_build;
369			/* Set when slice threading is used and at least one slice uses deblocking
370			* mode 1 (i.e. across slice boundaries). Then we disable the loop filter
371			* during normal MB decoding and execute it serially at the end.
372			*/
373			int postpone_filter;
374
375			/*
376			* Set to 1 when the current picture is IDR, 0 otherwise.
377			*/
378			int picture_idr;
379
380			/*
381			* Set to 1 when the current picture contains only I slices, 0 otherwise.
382			*/
383			int picture_intra_only;
384
385			int crop_left;
386			int crop_right;
387			int crop_top;
388			int crop_bottom;
389
390			int8_t(*intra4x4_pred_mode);
391			H264PredContext hpc;
392
393			uint8_t (*non_zero_count)[48];
394
395			#define LIST_NOT_USED -1 // FIXME rename?
396
397			/**
398			* block_offset[ 0..23] for frame macroblocks
399			* block_offset[24..47] for field macroblocks
400			*/
401			int block_offset[2 * (16 * 3)];
402
403			uint32_t *mb2b_xy; // FIXME are these 4 a good idea?
404			uint32_t *mb2br_xy;
405			int b_stride; // FIXME use s->b4_stride
406
407			uint16_t *slice_table; ///< slice_table_base + 2*mb_stride + 1
408
409			// interlacing specific flags
410			int mb_aff_frame;
411			int picture_structure;
412			int first_field;
413
414			uint8_t *list_counts; ///< Array of list_count per MB specifying the slice type
415
416			/* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0, 1, 2), 0x0? luma_cbp */
417			uint16_t *cbp_table;
418
419			/* chroma_pred_mode for i4x4 or i16x16, else 0 */
420			uint8_t *chroma_pred_mode_table;
421			uint8_t (*mvd_table[2])[2];
422			uint8_t *direct_table;
423
424			uint8_t scan_padding[16];
425			uint8_t zigzag_scan[16];
426			uint8_t zigzag_scan8x8[64];
427			uint8_t zigzag_scan8x8_cavlc[64];
428			uint8_t field_scan[16];
429			uint8_t field_scan8x8[64];
430			uint8_t field_scan8x8_cavlc[64];
431			uint8_t zigzag_scan_q0[16];
432			uint8_t zigzag_scan8x8_q0[64];
433			uint8_t zigzag_scan8x8_cavlc_q0[64];
434			uint8_t field_scan_q0[16];
435			uint8_t field_scan8x8_q0[64];
436			uint8_t field_scan8x8_cavlc_q0[64];
437
438			int mb_y;
439			int mb_height, mb_width;
440			int mb_stride;
441			int mb_num;
442
443			// =============================================================
444			// Things below are not used in the MB or more inner code
445
446			int nal_ref_idc;
447			int nal_unit_type;
448
449			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()
450
451			/**
452			* Used to parse AVC variant of H.264
453			*/
454			int is_avc; ///< this flag is != 0 if codec is avc1
455			int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
456
457			int bit_depth_luma; ///< luma bit depth from sps to detect changes
458			int chroma_format_idc; ///< chroma format from sps to detect changes
459
460			H264ParamSets ps;
461
462			uint16_t *slice_table_base;
463
464			H264POCContext poc;
465
466			H264Ref default_ref[2];
467			H264Picture *short_ref[32];
468			H264Picture *long_ref[32];
469			H264Picture *delayed_pic[H264_MAX_DPB_FRAMES + 2]; // FIXME size?
470			int last_pocs[H264_MAX_DPB_FRAMES];
471			H264Picture *next_output_pic;
472			int next_outputed_poc;
473			int poc_offset; ///< PicOrderCnt_offset from SMPTE RDD-2006
474
475			/**
476			* memory management control operations buffer.
477			*/
478			MMCO mmco[H264_MAX_MMCO_COUNT];
479			int nb_mmco;
480			int mmco_reset;
481			int explicit_ref_marking;
482
483			int long_ref_count; ///< number of actual long term references
484			int short_ref_count; ///< number of actual short term references
485
486			/**
487			* @name Members for slice based multithreading
488			* @{
489			*/
490			/**
491			* current slice number, used to initialize slice_num of each thread/context
492			*/
493			int current_slice;
494
495			/** @} */
496
497			/**
498			* Complement sei_pic_struct
499			* SEI_PIC_STRUCT_TOP_BOTTOM and SEI_PIC_STRUCT_BOTTOM_TOP indicate interlaced frames.
500			* However, soft telecined frames may have these values.
501			* This is used in an attempt to flag soft telecine progressive.
502			*/
503			int prev_interlaced_frame;
504
505			/**
506			* Are the SEI recovery points looking valid.
507			*/
508			int valid_recovery_point;
509
510			/**
511			* recovery_frame is the frame_num at which the next frame should
512			* be fully constructed.
513			*
514			* Set to -1 when not expecting a recovery point.
515			*/
516			int recovery_frame;
517
518			/**
519			* We have seen an IDR, so all the following frames in coded order are correctly
520			* decodable.
521			*/
522			#define FRAME_RECOVERED_IDR (1 << 0)
523			/**
524			* Sufficient number of frames have been decoded since a SEI recovery point,
525			* so all the following frames in presentation order are correct.
526			*/
527			#define FRAME_RECOVERED_SEI (1 << 1)
528			/**
529			* Recovery point detected by heuristic
530			*/
531			#define FRAME_RECOVERED_HEURISTIC (1 << 2)
532
533			/**
534			* Initial frame has been completely recovered.
535			*
536			* Once this is set, all following decoded as well as displayed frames will be marked as recovered
537			* If a frame is marked as recovered frame_recovered will be set once this frame is output and thus
538			* all subsequently output fraames are also marked as recovered
539			*
540			* In effect, if you want all subsequent DECODED frames marked as recovered, set frame_recovered
541			* If you want all subsequent DISPLAYED frames marked as recovered, set the frame->recovered
542			*/
543			int frame_recovered;
544
545			int has_recovery_point;
546
547			int missing_fields;
548
549			/* for frame threading, this is set to 1
550			* after finish_setup() has been called, so we cannot modify
551			* some context properties (which are supposed to stay constant between
552			* slices) anymore */
553			int setup_finished;
554
555			int cur_chroma_format_idc;
556			int cur_bit_depth_luma;
557			int16_t slice_row[MAX_SLICES]; ///< to detect when MAX_SLICES is too low
558
559			/* original AVCodecContext dimensions, used to handle container
560			* cropping */
561			int width_from_caller;
562			int height_from_caller;
563
564			int enable_er;
565			ERContext er;
566			int16_t *dc_val_base;
567
568			H264SEIContext sei;
569
570			struct AVRefStructPool *qscale_table_pool;
571			struct AVRefStructPool *mb_type_pool;
572			struct AVRefStructPool *motion_val_pool;
573			struct AVRefStructPool *ref_index_pool;
574			struct AVRefStructPool *decode_error_flags_pool;
575			int ref2frm[MAX_SLICES][2][64]; ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1
576
577			int non_gray; ///< Did we encounter a intra frame after a gray gap frame
578			int noref_gray;
579			int skip_gray;
580			} H264Context;
581
582			extern const uint16_t ff_h264_mb_sizes[4];
583
584			/**
585			* Reconstruct bitstream slice_type.
586			*/
587			int ff_h264_get_slice_type(const H264SliceContext *sl);
588
589			/**
590			* Allocate tables.
591			* needs width/height
592			*/
593			int ff_h264_alloc_tables(H264Context *h);
594
595			int ff_h264_decode_ref_pic_list_reordering(H264SliceContext *sl, void *logctx);
596			int ff_h264_build_ref_list(H264Context *h, H264SliceContext *sl);
597			void ff_h264_remove_all_refs(H264Context *h);
598
599			/**
600			* Execute the reference picture marking (memory management control operations).
601			*/
602			int ff_h264_execute_ref_pic_marking(H264Context *h);
603
604			int ff_h264_decode_ref_pic_marking(H264SliceContext *sl, GetBitContext *gb,
605			const H2645NAL *nal, void *logctx);
606
607			void ff_h264_hl_decode_mb(const H264Context *h, H264SliceContext *sl);
608			void ff_h264_decode_init_vlc(void);
609
610			/**
611			* Decode a macroblock
612			* @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
613			*/
614			int ff_h264_decode_mb_cavlc(const H264Context *h, H264SliceContext *sl);
615
616			/**
617			* Decode a CABAC coded macroblock
618			* @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
619			*/
620			int ff_h264_decode_mb_cabac(const H264Context *h, H264SliceContext *sl);
621
622			void ff_h264_init_cabac_states(const H264Context *h, H264SliceContext *sl);
623
624			void ff_h264_direct_dist_scale_factor(const H264Context *const h, H264SliceContext *sl);
625			void ff_h264_direct_ref_list_init(const H264Context *const h, H264SliceContext *sl);
626			void ff_h264_pred_direct_motion(const H264Context *const h, H264SliceContext *sl,
627			int *mb_type);
628
629			void ff_h264_filter_mb_fast(const H264Context *h, H264SliceContext *sl, int mb_x, int mb_y,
630			uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
631			unsigned int linesize, unsigned int uvlinesize);
632			void ff_h264_filter_mb(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
636			/*
637			* o-o o-o
638			* / / /
639			* o-o o-o
640			* ,---'
641			* o-o o-o
642			* / / /
643			* o-o o-o
644			*/
645
646			/* Scan8 organization:
647			* 0 1 2 3 4 5 6 7
648			* 0 DY y y y y y
649			* 1 y Y Y Y Y
650			* 2 y Y Y Y Y
651			* 3 y Y Y Y Y
652			* 4 y Y Y Y Y
653			* 5 DU u u u u u
654			* 6 u U U U U
655			* 7 u U U U U
656			* 8 u U U U U
657			* 9 u U U U U
658			* 10 DV v v v v v
659			* 11 v V V V V
660			* 12 v V V V V
661			* 13 v V V V V
662			* 14 v V V V V
663			* DY/DU/DV are for luma/chroma DC.
664			*/
665
666			#define LUMA_DC_BLOCK_INDEX 48
667			#define CHROMA_DC_BLOCK_INDEX 49
668
669			/**
670			* Get the chroma qp.
671			*/
672		64124062	static av_always_inline int get_chroma_qp(const PPS *pps, int t, int qscale)
673			{
674		64124062	return pps->chroma_qp_table[t][qscale];
675			}
676
677			int ff_h264_field_end(H264Context *h, H264SliceContext *sl, int in_setup);
678
679			int ff_h264_ref_picture(H264Picture *dst, const H264Picture *src);
680			int ff_h264_replace_picture(H264Picture *dst, const H264Picture *src);
681			void ff_h264_unref_picture(H264Picture *pic);
682
683			void ff_h264_slice_context_init(H264Context *h, H264SliceContext *sl);
684
685			void ff_h264_draw_horiz_band(const H264Context *h, H264SliceContext *sl, int y, int height);
686
687			/**
688			* Submit a slice for decoding.
689			*
690			* Parse the slice header, starting a new field/frame if necessary. If any
691			* slices are queued for the previous field, they are decoded.
692			*/
693			int ff_h264_queue_decode_slice(H264Context *h, const H2645NAL *nal);
694			int ff_h264_execute_decode_slices(H264Context *h);
695			int ff_h264_update_thread_context(AVCodecContext *dst,
696			const AVCodecContext *src);
697			int ff_h264_update_thread_context_for_user(AVCodecContext *dst,
698			const AVCodecContext *src);
699
700			void ff_h264_flush_change(H264Context *h);
701
702			void ff_h264_free_tables(H264Context *h);
703
704			void ff_h264_set_erpic(ERPicture *dst, const H264Picture *src);
705
706			#endif /* AVCODEC_H264DEC_H */
707