Better title for the file.
[libav.git] / libavcodec / h264.h
CommitLineData
26b4fe82
AJ
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
26b4fe82
AJ
20 */
21
22/**
bad5537e 23 * @file libavcodec/h264.h
26b4fe82
AJ
24 * H.264 / AVC / MPEG4 part10 codec.
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
27
98790382
SS
28#ifndef AVCODEC_H264_H
29#define AVCODEC_H264_H
26b4fe82
AJ
30
31#include "dsputil.h"
32#include "cabac.h"
33#include "mpegvideo.h"
c92a30bb 34#include "h264pred.h"
26b4fe82
AJ
35
36#define interlaced_dct interlaced_dct_is_a_bad_name
90b5b51e 37#define mb_intra mb_intra_is_not_initialized_see_mb_type
26b4fe82
AJ
38
39#define LUMA_DC_BLOCK_INDEX 25
40#define CHROMA_DC_BLOCK_INDEX 26
41
42#define CHROMA_DC_COEFF_TOKEN_VLC_BITS 8
43#define COEFF_TOKEN_VLC_BITS 8
44#define TOTAL_ZEROS_VLC_BITS 9
45#define CHROMA_DC_TOTAL_ZEROS_VLC_BITS 3
46#define RUN_VLC_BITS 3
47#define RUN7_VLC_BITS 6
48
49#define MAX_SPS_COUNT 32
50#define MAX_PPS_COUNT 256
51
52#define MAX_MMCO_COUNT 66
53
64b9d48f
AS
54#define MAX_DELAYED_PIC_COUNT 16
55
26b4fe82
AJ
56/* Compiling in interlaced support reduces the speed
57 * of progressive decoding by about 2%. */
58#define ALLOW_INTERLACE
59
0af6967e
MN
60#define ALLOW_NOCHROMA
61
b735aeea
MN
62/**
63 * The maximum number of slices supported by the decoder.
64 * must be a power of 2
65 */
66#define MAX_SLICES 16
67
26b4fe82
AJ
68#ifdef ALLOW_INTERLACE
69#define MB_MBAFF h->mb_mbaff
70#define MB_FIELD h->mb_field_decoding_flag
71#define FRAME_MBAFF h->mb_aff_frame
d6c52130 72#define FIELD_PICTURE (s->picture_structure != PICT_FRAME)
26b4fe82
AJ
73#else
74#define MB_MBAFF 0
75#define MB_FIELD 0
76#define FRAME_MBAFF 0
bbb3edb8 77#define FIELD_PICTURE 0
26b4fe82
AJ
78#undef IS_INTERLACED
79#define IS_INTERLACED(mb_type) 0
80#endif
f3e53d9f 81#define FIELD_OR_MBAFF_PICTURE (FRAME_MBAFF || FIELD_PICTURE)
26b4fe82 82
0af6967e
MN
83#ifdef ALLOW_NOCHROMA
84#define CHROMA h->sps.chroma_format_idc
85#else
86#define CHROMA 1
87#endif
88
44ee6135
MN
89#define EXTENDED_SAR 255
90
ce9ff9cc
DB
91#define MB_TYPE_REF0 MB_TYPE_ACPRED //dirty but it fits in 16 bit
92#define MB_TYPE_8x8DCT 0x01000000
93#define IS_REF0(a) ((a) & MB_TYPE_REF0)
94#define IS_8x8DCT(a) ((a) & MB_TYPE_8x8DCT)
95
44ee6135
MN
96/* NAL unit types */
97enum {
2791c608
MN
98 NAL_SLICE=1,
99 NAL_DPA,
100 NAL_DPB,
101 NAL_DPC,
102 NAL_IDR_SLICE,
103 NAL_SEI,
104 NAL_SPS,
105 NAL_PPS,
106 NAL_AUD,
107 NAL_END_SEQUENCE,
108 NAL_END_STREAM,
109 NAL_FILLER_DATA,
110 NAL_SPS_EXT,
111 NAL_AUXILIARY_SLICE=19
44ee6135
MN
112};
113
26b4fe82 114/**
dd02ea11
IS
115 * SEI message types
116 */
117typedef enum {
2ea89d92 118 SEI_BUFFERING_PERIOD = 0, ///< buffering period (H.264, D.1.1)
dd02ea11
IS
119 SEI_TYPE_PIC_TIMING = 1, ///< picture timing
120 SEI_TYPE_USER_DATA_UNREGISTERED = 5, ///< unregistered user data
121 SEI_TYPE_RECOVERY_POINT = 6 ///< recovery point (frame # to decoder sync)
122} SEI_Type;
123
124/**
b09a7c05
125 * pic_struct in picture timing SEI message
126 */
127typedef enum {
128 SEI_PIC_STRUCT_FRAME = 0, ///< 0: %frame
129 SEI_PIC_STRUCT_TOP_FIELD = 1, ///< 1: top field
130 SEI_PIC_STRUCT_BOTTOM_FIELD = 2, ///< 2: bottom field
131 SEI_PIC_STRUCT_TOP_BOTTOM = 3, ///< 3: top field, bottom field, in that order
132 SEI_PIC_STRUCT_BOTTOM_TOP = 4, ///< 4: bottom field, top field, in that order
133 SEI_PIC_STRUCT_TOP_BOTTOM_TOP = 5, ///< 5: top field, bottom field, top field repeated, in that order
134 SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM = 6, ///< 6: bottom field, top field, bottom field repeated, in that order
135 SEI_PIC_STRUCT_FRAME_DOUBLING = 7, ///< 7: %frame doubling
136 SEI_PIC_STRUCT_FRAME_TRIPLING = 8 ///< 8: %frame tripling
137} SEI_PicStructType;
138
139/**
26b4fe82
AJ
140 * Sequence parameter set
141 */
142typedef struct SPS{
143
144 int profile_idc;
145 int level_idc;
0af6967e 146 int chroma_format_idc;
26b4fe82
AJ
147 int transform_bypass; ///< qpprime_y_zero_transform_bypass_flag
148 int log2_max_frame_num; ///< log2_max_frame_num_minus4 + 4
149 int poc_type; ///< pic_order_cnt_type
150 int log2_max_poc_lsb; ///< log2_max_pic_order_cnt_lsb_minus4
151 int delta_pic_order_always_zero_flag;
152 int offset_for_non_ref_pic;
153 int offset_for_top_to_bottom_field;
154 int poc_cycle_length; ///< num_ref_frames_in_pic_order_cnt_cycle
155 int ref_frame_count; ///< num_ref_frames
156 int gaps_in_frame_num_allowed_flag;
bcc3476c
JD
157 int mb_width; ///< pic_width_in_mbs_minus1 + 1
158 int mb_height; ///< pic_height_in_map_units_minus1 + 1
26b4fe82
AJ
159 int frame_mbs_only_flag;
160 int mb_aff; ///<mb_adaptive_frame_field_flag
161 int direct_8x8_inference_flag;
162 int crop; ///< frame_cropping_flag
59eeddf0
MN
163 unsigned int crop_left; ///< frame_cropping_rect_left_offset
164 unsigned int crop_right; ///< frame_cropping_rect_right_offset
165 unsigned int crop_top; ///< frame_cropping_rect_top_offset
166 unsigned int crop_bottom; ///< frame_cropping_rect_bottom_offset
26b4fe82
AJ
167 int vui_parameters_present_flag;
168 AVRational sar;
c4dffe7e
DC
169 int video_signal_type_present_flag;
170 int full_range;
171 int colour_description_present_flag;
172 enum AVColorPrimaries color_primaries;
173 enum AVColorTransferCharacteristic color_trc;
174 enum AVColorSpace colorspace;
26b4fe82
AJ
175 int timing_info_present_flag;
176 uint32_t num_units_in_tick;
177 uint32_t time_scale;
178 int fixed_frame_rate_flag;
179 short offset_for_ref_frame[256]; //FIXME dyn aloc?
180 int bitstream_restriction_flag;
181 int num_reorder_frames;
182 int scaling_matrix_present;
183 uint8_t scaling_matrix4[6][16];
184 uint8_t scaling_matrix8[2][64];
b09a7c05
185 int nal_hrd_parameters_present_flag;
186 int vcl_hrd_parameters_present_flag;
187 int pic_struct_present_flag;
188 int time_offset_length;
24a414e0 189 int cpb_cnt; ///< See H.264 E.1.2
82e38c29 190 int initial_cpb_removal_delay_length; ///< initial_cpb_removal_delay_length_minus1 +1
b09a7c05
191 int cpb_removal_delay_length; ///< cpb_removal_delay_length_minus1 + 1
192 int dpb_output_delay_length; ///< dpb_output_delay_length_minus1 + 1
cb99c652
GB
193 int bit_depth_luma; ///< bit_depth_luma_minus8 + 8
194 int bit_depth_chroma; ///< bit_depth_chroma_minus8 + 8
195 int residual_color_transform_flag; ///< residual_colour_transform_flag
26b4fe82
AJ
196}SPS;
197
198/**
199 * Picture parameter set
200 */
201typedef struct PPS{
202 unsigned int sps_id;
203 int cabac; ///< entropy_coding_mode_flag
204 int pic_order_present; ///< pic_order_present_flag
205 int slice_group_count; ///< num_slice_groups_minus1 + 1
206 int mb_slice_group_map_type;
207 unsigned int ref_count[2]; ///< num_ref_idx_l0/1_active_minus1 + 1
208 int weighted_pred; ///< weighted_pred_flag
209 int weighted_bipred_idc;
210 int init_qp; ///< pic_init_qp_minus26 + 26
211 int init_qs; ///< pic_init_qs_minus26 + 26
4691a77d 212 int chroma_qp_index_offset[2];
26b4fe82
AJ
213 int deblocking_filter_parameters_present; ///< deblocking_filter_parameters_present_flag
214 int constrained_intra_pred; ///< constrained_intra_pred_flag
215 int redundant_pic_cnt_present; ///< redundant_pic_cnt_present_flag
216 int transform_8x8_mode; ///< transform_8x8_mode_flag
217 uint8_t scaling_matrix4[6][16];
218 uint8_t scaling_matrix8[2][64];
5a78bfbd 219 uint8_t chroma_qp_table[2][64]; ///< pre-scaled (with chroma_qp_index_offset) version of qp_table
4691a77d 220 int chroma_qp_diff;
26b4fe82
AJ
221}PPS;
222
223/**
224 * Memory management control operation opcode.
225 */
226typedef enum MMCOOpcode{
227 MMCO_END=0,
228 MMCO_SHORT2UNUSED,
229 MMCO_LONG2UNUSED,
230 MMCO_SHORT2LONG,
231 MMCO_SET_MAX_LONG,
232 MMCO_RESET,
233 MMCO_LONG,
234} MMCOOpcode;
235
236/**
237 * Memory management control operation.
238 */
239typedef struct MMCO{
240 MMCOOpcode opcode;
0d0447ea
JD
241 int short_pic_num; ///< pic_num without wrapping (pic_num & max_pic_num)
242 int long_arg; ///< index, pic_num, or num long refs depending on opcode
26b4fe82
AJ
243} MMCO;
244
245/**
246 * H264Context
247 */
248typedef struct H264Context{
249 MpegEncContext s;
250 int nal_ref_idc;
251 int nal_unit_type;
24456882
252 uint8_t *rbsp_buffer[2];
253 unsigned int rbsp_buffer_size[2];
26b4fe82
AJ
254
255 /**
256 * Used to parse AVC variant of h264
257 */
258 int is_avc; ///< this flag is != 0 if codec is avc1
259 int got_avcC; ///< flag used to parse avcC data only once
260 int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
261
4691a77d 262 int chroma_qp[2]; //QPc
26b4fe82
AJ
263
264 int prev_mb_skipped;
265 int next_mb_skipped;
266
267 //prediction stuff
268 int chroma_pred_mode;
269 int intra16x16_pred_mode;
270
271 int top_mb_xy;
272 int left_mb_xy[2];
273
274 int8_t intra4x4_pred_mode_cache[5*8];
275 int8_t (*intra4x4_pred_mode)[8];
c92a30bb 276 H264PredContext hpc;
26b4fe82
AJ
277 unsigned int topleft_samples_available;
278 unsigned int top_samples_available;
279 unsigned int topright_samples_available;
280 unsigned int left_samples_available;
281 uint8_t (*top_borders[2])[16+2*8];
282 uint8_t left_border[2*(17+2*9)];
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[6*8]);
289 uint8_t (*non_zero_count)[16];
290
291 /**
292 * Motion vector cache.
293 */
294 DECLARE_ALIGNED_8(int16_t, mv_cache[2][5*8][2]);
295 DECLARE_ALIGNED_8(int8_t, ref_cache[2][5*8]);
296#define LIST_NOT_USED -1 //FIXME rename?
297#define PART_NOT_AVAILABLE -2
298
299 /**
300 * is 1 if the specific list MV&references are set to 0,0,-2.
301 */
302 int mv_cache_clean[2];
303
304 /**
305 * number of neighbors (top and/or left) that used 8x8 dct
306 */
307 int neighbor_transform_size;
308
309 /**
310 * block_offset[ 0..23] for frame macroblocks
311 * block_offset[24..47] for field macroblocks
312 */
313 int block_offset[2*(16+8)];
314
315 uint32_t *mb2b_xy; //FIXME are these 4 a good idea?
316 uint32_t *mb2b8_xy;
317 int b_stride; //FIXME use s->b4_stride
318 int b8_stride;
319
320 int mb_linesize; ///< may be equal to s->linesize or s->linesize*2, for mbaff
321 int mb_uvlinesize;
322
323 int emu_edge_width;
324 int emu_edge_height;
325
326 int halfpel_flag;
327 int thirdpel_flag;
328
329 int unknown_svq3_flag;
330 int next_slice_index;
331
7978debd 332 SPS *sps_buffers[MAX_SPS_COUNT];
26b4fe82
AJ
333 SPS sps; ///< current sps
334
7978debd 335 PPS *pps_buffers[MAX_PPS_COUNT];
26b4fe82
AJ
336 /**
337 * current pps
338 */
339 PPS pps; //FIXME move to Picture perhaps? (->no) do we need that?
340
341 uint32_t dequant4_buffer[6][52][16];
342 uint32_t dequant8_buffer[2][52][64];
343 uint32_t (*dequant4_coeff[6])[16];
344 uint32_t (*dequant8_coeff[2])[64];
345 int dequant_coeff_pps; ///< reinit tables when pps changes
346
347 int slice_num;
b735aeea
MN
348 uint16_t *slice_table_base;
349 uint16_t *slice_table; ///< slice_table_base + 2*mb_stride + 1
26b4fe82 350 int slice_type;
e3e6f18f 351 int slice_type_nos; ///< S free slice type (SI/SP are remapped to I/P)
26b4fe82
AJ
352 int slice_type_fixed;
353
354 //interlacing specific flags
355 int mb_aff_frame;
356 int mb_field_decoding_flag;
357 int mb_mbaff; ///< mb_aff_frame && mb_field_decoding_flag
358
da2911d5 359 DECLARE_ALIGNED_8(uint16_t, sub_mb_type[4]);
26b4fe82
AJ
360
361 //POC stuff
362 int poc_lsb;
363 int poc_msb;
364 int delta_poc_bottom;
365 int delta_poc[2];
366 int frame_num;
367 int prev_poc_msb; ///< poc_msb of the last reference pic for POC type 0
368 int prev_poc_lsb; ///< poc_lsb of the last reference pic for POC type 0
369 int frame_num_offset; ///< for POC type 2
370 int prev_frame_num_offset; ///< for POC type 2
371 int prev_frame_num; ///< frame_num of the last pic for POC type 1/2
372
373 /**
f57e2af6 374 * frame_num for frames or 2*frame_num+1 for field pics.
26b4fe82
AJ
375 */
376 int curr_pic_num;
377
378 /**
379 * max_frame_num or 2*max_frame_num for field pics.
380 */
381 int max_pic_num;
382
383 //Weighted pred stuff
384 int use_weight;
385 int use_weight_chroma;
386 int luma_log2_weight_denom;
387 int chroma_log2_weight_denom;
388 int luma_weight[2][48];
389 int luma_offset[2][48];
390 int chroma_weight[2][48][2];
391 int chroma_offset[2][48][2];
392 int implicit_weight[48][48];
393
394 //deblock
395 int deblocking_filter; ///< disable_deblocking_filter_idc with 1<->0
396 int slice_alpha_c0_offset;
397 int slice_beta_offset;
398
399 int redundant_pic_count;
400
401 int direct_spatial_mv_pred;
402 int dist_scale_factor[16];
8b1fd554 403 int dist_scale_factor_field[2][32];
f4d3382d
MN
404 int map_col_to_list0[2][16+32];
405 int map_col_to_list0_field[2][2][16+32];
26b4fe82
AJ
406
407 /**
408 * num_ref_idx_l0/1_active_minus1 + 1
409 */
410 unsigned int ref_count[2]; ///< counts frames or fields, depending on current mb mode
411 unsigned int list_count;
412 Picture *short_ref[32];
413 Picture *long_ref[32];
bcc3476c
JD
414 Picture default_ref_list[2][32]; ///< base reference list for all slices of a coded picture
415 Picture ref_list[2][48]; /**< 0..15: frame refs, 16..47: mbaff field refs.
416 Reordered version of default_ref_list
417 according to picture reordering in slice header */
b735aeea 418 int ref2frm[MAX_SLICES][2][64]; ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1
64b9d48f 419 Picture *delayed_pic[MAX_DELAYED_PIC_COUNT+2]; //FIXME size?
df8a7dff 420 int outputed_poc;
26b4fe82
AJ
421
422 /**
423 * memory management control operations buffer.
424 */
425 MMCO mmco[MAX_MMCO_COUNT];
426 int mmco_index;
427
428 int long_ref_count; ///< number of actual long term references
429 int short_ref_count; ///< number of actual short term references
430
431 //data partitioning
432 GetBitContext intra_gb;
433 GetBitContext inter_gb;
434 GetBitContext *intra_gb_ptr;
435 GetBitContext *inter_gb_ptr;
436
ed5d7a53 437 DECLARE_ALIGNED_16(DCTELEM, mb[16*24]);
2cab6401 438 DCTELEM mb_padding[256]; ///< as mb is addressed by scantable[i] and scantable is uint8_t we can either check that i is not too large or ensure that there is some unused stuff after mb
26b4fe82
AJ
439
440 /**
441 * Cabac
442 */
443 CABACContext cabac;
444 uint8_t cabac_state[460];
445 int cabac_init_idc;
446
447 /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0,1,2), 0x0? luma_cbp */
448 uint16_t *cbp_table;
449 int cbp;
450 int top_cbp;
451 int left_cbp;
452 /* chroma_pred_mode for i4x4 or i16x16, else 0 */
453 uint8_t *chroma_pred_mode_table;
454 int last_qscale_diff;
455 int16_t (*mvd_table[2])[2];
456 DECLARE_ALIGNED_8(int16_t, mvd_cache[2][5*8][2]);
457 uint8_t *direct_table;
458 uint8_t direct_cache[5*8];
459
460 uint8_t zigzag_scan[16];
461 uint8_t zigzag_scan8x8[64];
462 uint8_t zigzag_scan8x8_cavlc[64];
463 uint8_t field_scan[16];
464 uint8_t field_scan8x8[64];
465 uint8_t field_scan8x8_cavlc[64];
466 const uint8_t *zigzag_scan_q0;
467 const uint8_t *zigzag_scan8x8_q0;
468 const uint8_t *zigzag_scan8x8_cavlc_q0;
469 const uint8_t *field_scan_q0;
470 const uint8_t *field_scan8x8_q0;
471 const uint8_t *field_scan8x8_cavlc_q0;
472
473 int x264_build;
afebe2f7
474
475 /**
476 * @defgroup multithreading Members for slice based multithreading
477 * @{
478 */
479 struct H264Context *thread_context[MAX_THREADS];
480
481 /**
482 * current slice number, used to initalize slice_num of each thread/context
483 */
484 int current_slice;
485
486 /**
487 * Max number of threads / contexts.
488 * This is equal to AVCodecContext.thread_count unless
489 * multithreaded decoding is impossible, in which case it is
490 * reduced to 1.
491 */
492 int max_contexts;
493
494 /**
495 * 1 if the single thread fallback warning has already been
496 * displayed, 0 otherwise.
497 */
498 int single_decode_warning;
499
500 int last_slice_type;
501 /** @} */
502
64514ee8
AS
503 int mb_xy;
504
1fdcdf8d 505 uint32_t svq3_watermark_key;
b09a7c05
506
507 /**
508 * pic_struct in picture timing SEI message
509 */
510 SEI_PicStructType sei_pic_struct;
89db0bae 511
37a558fe 512 /**
b19d493f
HY
513 * Complement sei_pic_struct
514 * SEI_PIC_STRUCT_TOP_BOTTOM and SEI_PIC_STRUCT_BOTTOM_TOP indicate interlaced frames.
515 * However, soft telecined frames may have these values.
516 * This is used in an attempt to flag soft telecine progressive.
517 */
518 int prev_interlaced_frame;
519
520 /**
70e01da3
IS
521 * Bit set of clock types for fields/frames in picture timing SEI message.
522 * For each found ct_type, appropriate bit is set (e.g., bit 1 for
523 * interlaced).
524 */
525 int sei_ct_type;
526
527 /**
ff594f81
IS
528 * dpb_output_delay in picture timing SEI message, see H.264 C.2.2
529 */
530 int sei_dpb_output_delay;
531
532 /**
cf6065ca
IS
533 * cpb_removal_delay in picture timing SEI message, see H.264 C.1.2
534 */
535 int sei_cpb_removal_delay;
536
537 /**
37a558fe
IS
538 * recovery_frame_cnt from SEI message
539 *
540 * Set to -1 if no recovery point SEI message found or to number of frames
541 * before playback synchronizes. Frames having recovery point are key
542 * frames.
543 */
544 int sei_recovery_frame_cnt;
545
89db0bae 546 int is_complex;
cb99c652
GB
547
548 int luma_weight_flag[2]; ///< 7.4.3.2 luma_weight_lX_flag
549 int chroma_weight_flag[2]; ///< 7.4.3.2 chroma_weight_lX_flag
2ea89d92
IS
550
551 // Timestamp stuff
552 int sei_buffering_period_present; ///< Buffering period SEI flag
553 int initial_cpb_removal_delay[32]; ///< Initial timestamps for CPBs
26b4fe82
AJ
554}H264Context;
555
1790a5e9
IS
556/**
557 * Decode SEI
558 */
559int ff_h264_decode_sei(H264Context *h);
560
561/**
562 * Decode SPS
563 */
564int ff_h264_decode_seq_parameter_set(H264Context *h);
565
566/**
567 * Decode PPS
568 */
569int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length);
570
571/**
572 * Decodes a network abstraction layer unit.
573 * @param consumed is the number of bytes used as input
574 * @param length is the length of the array
575 * @param dst_length is the number of decoded bytes FIXME here or a decode rbsp tailing?
576 * @returns decoded bytes, might be src+1 if no escapes
577 */
578const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src, int *dst_length, int *consumed, int length);
579
580/**
581 * identifies the exact end of the bitstream
582 * @return the length of the trailing, or 0 if damaged
583 */
584int ff_h264_decode_rbsp_trailing(H264Context *h, const uint8_t *src);
585
15861962
RD
586/**
587 * frees any data that may have been allocated in the H264 context like SPS, PPS etc.
588 */
cbf1eae9 589av_cold void ff_h264_free_context(H264Context *h);
15861962 590
75dd6938
LA
591/**
592 * reconstructs bitstream slice_type.
593 */
594int ff_h264_get_slice_type(H264Context *h);
595
98790382 596#endif /* AVCODEC_H264_H */