Make avfilter_insert_filter() log the names of the filters between
[libav.git] / libavcodec / h264.h
CommitLineData
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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
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20 */
21
22/**
bad5537e 23 * @file libavcodec/h264.h
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24 * H.264 / AVC / MPEG4 part10 codec.
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
27
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28#ifndef AVCODEC_H264_H
29#define AVCODEC_H264_H
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30
31#include "dsputil.h"
32#include "cabac.h"
33#include "mpegvideo.h"
c92a30bb 34#include "h264pred.h"
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35
36#define interlaced_dct interlaced_dct_is_a_bad_name
90b5b51e 37#define mb_intra mb_intra_is_not_initialized_see_mb_type
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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
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54#define MAX_DELAYED_PIC_COUNT 16
55
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56/* Compiling in interlaced support reduces the speed
57 * of progressive decoding by about 2%. */
58#define ALLOW_INTERLACE
59
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60#define ALLOW_NOCHROMA
61
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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
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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)
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73#else
74#define MB_MBAFF 0
75#define MB_FIELD 0
76#define FRAME_MBAFF 0
bbb3edb8 77#define FIELD_PICTURE 0
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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
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83#ifdef ALLOW_NOCHROMA
84#define CHROMA h->sps.chroma_format_idc
85#else
86#define CHROMA 1
87#endif
88
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89#define EXTENDED_SAR 255
90
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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
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96/**
97 * Value of Picture.reference when Picture is not a reference picture, but
98 * is held for delayed output.
99 */
100#define DELAYED_PIC_REF 4
101
102
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103/* NAL unit types */
104enum {
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105 NAL_SLICE=1,
106 NAL_DPA,
107 NAL_DPB,
108 NAL_DPC,
109 NAL_IDR_SLICE,
110 NAL_SEI,
111 NAL_SPS,
112 NAL_PPS,
113 NAL_AUD,
114 NAL_END_SEQUENCE,
115 NAL_END_STREAM,
116 NAL_FILLER_DATA,
117 NAL_SPS_EXT,
118 NAL_AUXILIARY_SLICE=19
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119};
120
26b4fe82 121/**
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122 * SEI message types
123 */
124typedef enum {
2ea89d92 125 SEI_BUFFERING_PERIOD = 0, ///< buffering period (H.264, D.1.1)
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126 SEI_TYPE_PIC_TIMING = 1, ///< picture timing
127 SEI_TYPE_USER_DATA_UNREGISTERED = 5, ///< unregistered user data
128 SEI_TYPE_RECOVERY_POINT = 6 ///< recovery point (frame # to decoder sync)
129} SEI_Type;
130
131/**
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132 * pic_struct in picture timing SEI message
133 */
134typedef enum {
135 SEI_PIC_STRUCT_FRAME = 0, ///< 0: %frame
136 SEI_PIC_STRUCT_TOP_FIELD = 1, ///< 1: top field
137 SEI_PIC_STRUCT_BOTTOM_FIELD = 2, ///< 2: bottom field
138 SEI_PIC_STRUCT_TOP_BOTTOM = 3, ///< 3: top field, bottom field, in that order
139 SEI_PIC_STRUCT_BOTTOM_TOP = 4, ///< 4: bottom field, top field, in that order
140 SEI_PIC_STRUCT_TOP_BOTTOM_TOP = 5, ///< 5: top field, bottom field, top field repeated, in that order
141 SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM = 6, ///< 6: bottom field, top field, bottom field repeated, in that order
142 SEI_PIC_STRUCT_FRAME_DOUBLING = 7, ///< 7: %frame doubling
143 SEI_PIC_STRUCT_FRAME_TRIPLING = 8 ///< 8: %frame tripling
144} SEI_PicStructType;
145
146/**
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147 * Sequence parameter set
148 */
149typedef struct SPS{
150
151 int profile_idc;
152 int level_idc;
0af6967e 153 int chroma_format_idc;
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154 int transform_bypass; ///< qpprime_y_zero_transform_bypass_flag
155 int log2_max_frame_num; ///< log2_max_frame_num_minus4 + 4
156 int poc_type; ///< pic_order_cnt_type
157 int log2_max_poc_lsb; ///< log2_max_pic_order_cnt_lsb_minus4
158 int delta_pic_order_always_zero_flag;
159 int offset_for_non_ref_pic;
160 int offset_for_top_to_bottom_field;
161 int poc_cycle_length; ///< num_ref_frames_in_pic_order_cnt_cycle
162 int ref_frame_count; ///< num_ref_frames
163 int gaps_in_frame_num_allowed_flag;
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164 int mb_width; ///< pic_width_in_mbs_minus1 + 1
165 int mb_height; ///< pic_height_in_map_units_minus1 + 1
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166 int frame_mbs_only_flag;
167 int mb_aff; ///<mb_adaptive_frame_field_flag
168 int direct_8x8_inference_flag;
169 int crop; ///< frame_cropping_flag
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170 unsigned int crop_left; ///< frame_cropping_rect_left_offset
171 unsigned int crop_right; ///< frame_cropping_rect_right_offset
172 unsigned int crop_top; ///< frame_cropping_rect_top_offset
173 unsigned int crop_bottom; ///< frame_cropping_rect_bottom_offset
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174 int vui_parameters_present_flag;
175 AVRational sar;
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176 int video_signal_type_present_flag;
177 int full_range;
178 int colour_description_present_flag;
179 enum AVColorPrimaries color_primaries;
180 enum AVColorTransferCharacteristic color_trc;
181 enum AVColorSpace colorspace;
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182 int timing_info_present_flag;
183 uint32_t num_units_in_tick;
184 uint32_t time_scale;
185 int fixed_frame_rate_flag;
186 short offset_for_ref_frame[256]; //FIXME dyn aloc?
187 int bitstream_restriction_flag;
188 int num_reorder_frames;
189 int scaling_matrix_present;
190 uint8_t scaling_matrix4[6][16];
191 uint8_t scaling_matrix8[2][64];
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192 int nal_hrd_parameters_present_flag;
193 int vcl_hrd_parameters_present_flag;
194 int pic_struct_present_flag;
195 int time_offset_length;
24a414e0 196 int cpb_cnt; ///< See H.264 E.1.2
82e38c29 197 int initial_cpb_removal_delay_length; ///< initial_cpb_removal_delay_length_minus1 +1
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198 int cpb_removal_delay_length; ///< cpb_removal_delay_length_minus1 + 1
199 int dpb_output_delay_length; ///< dpb_output_delay_length_minus1 + 1
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200 int bit_depth_luma; ///< bit_depth_luma_minus8 + 8
201 int bit_depth_chroma; ///< bit_depth_chroma_minus8 + 8
202 int residual_color_transform_flag; ///< residual_colour_transform_flag
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203}SPS;
204
205/**
206 * Picture parameter set
207 */
208typedef struct PPS{
209 unsigned int sps_id;
210 int cabac; ///< entropy_coding_mode_flag
211 int pic_order_present; ///< pic_order_present_flag
212 int slice_group_count; ///< num_slice_groups_minus1 + 1
213 int mb_slice_group_map_type;
214 unsigned int ref_count[2]; ///< num_ref_idx_l0/1_active_minus1 + 1
215 int weighted_pred; ///< weighted_pred_flag
216 int weighted_bipred_idc;
217 int init_qp; ///< pic_init_qp_minus26 + 26
218 int init_qs; ///< pic_init_qs_minus26 + 26
4691a77d 219 int chroma_qp_index_offset[2];
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220 int deblocking_filter_parameters_present; ///< deblocking_filter_parameters_present_flag
221 int constrained_intra_pred; ///< constrained_intra_pred_flag
222 int redundant_pic_cnt_present; ///< redundant_pic_cnt_present_flag
223 int transform_8x8_mode; ///< transform_8x8_mode_flag
224 uint8_t scaling_matrix4[6][16];
225 uint8_t scaling_matrix8[2][64];
5a78bfbd 226 uint8_t chroma_qp_table[2][64]; ///< pre-scaled (with chroma_qp_index_offset) version of qp_table
4691a77d 227 int chroma_qp_diff;
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228}PPS;
229
230/**
231 * Memory management control operation opcode.
232 */
233typedef enum MMCOOpcode{
234 MMCO_END=0,
235 MMCO_SHORT2UNUSED,
236 MMCO_LONG2UNUSED,
237 MMCO_SHORT2LONG,
238 MMCO_SET_MAX_LONG,
239 MMCO_RESET,
240 MMCO_LONG,
241} MMCOOpcode;
242
243/**
244 * Memory management control operation.
245 */
246typedef struct MMCO{
247 MMCOOpcode opcode;
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248 int short_pic_num; ///< pic_num without wrapping (pic_num & max_pic_num)
249 int long_arg; ///< index, pic_num, or num long refs depending on opcode
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250} MMCO;
251
252/**
253 * H264Context
254 */
255typedef struct H264Context{
256 MpegEncContext s;
257 int nal_ref_idc;
258 int nal_unit_type;
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259 uint8_t *rbsp_buffer[2];
260 unsigned int rbsp_buffer_size[2];
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261
262 /**
263 * Used to parse AVC variant of h264
264 */
265 int is_avc; ///< this flag is != 0 if codec is avc1
266 int got_avcC; ///< flag used to parse avcC data only once
267 int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
268
4691a77d 269 int chroma_qp[2]; //QPc
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270
271 int prev_mb_skipped;
272 int next_mb_skipped;
273
274 //prediction stuff
275 int chroma_pred_mode;
276 int intra16x16_pred_mode;
277
278 int top_mb_xy;
279 int left_mb_xy[2];
280
281 int8_t intra4x4_pred_mode_cache[5*8];
282 int8_t (*intra4x4_pred_mode)[8];
c92a30bb 283 H264PredContext hpc;
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284 unsigned int topleft_samples_available;
285 unsigned int top_samples_available;
286 unsigned int topright_samples_available;
287 unsigned int left_samples_available;
288 uint8_t (*top_borders[2])[16+2*8];
289 uint8_t left_border[2*(17+2*9)];
290
291 /**
292 * non zero coeff count cache.
293 * is 64 if not available.
294 */
295 DECLARE_ALIGNED_8(uint8_t, non_zero_count_cache[6*8]);
296 uint8_t (*non_zero_count)[16];
297
298 /**
299 * Motion vector cache.
300 */
301 DECLARE_ALIGNED_8(int16_t, mv_cache[2][5*8][2]);
302 DECLARE_ALIGNED_8(int8_t, ref_cache[2][5*8]);
303#define LIST_NOT_USED -1 //FIXME rename?
304#define PART_NOT_AVAILABLE -2
305
306 /**
307 * is 1 if the specific list MV&references are set to 0,0,-2.
308 */
309 int mv_cache_clean[2];
310
311 /**
312 * number of neighbors (top and/or left) that used 8x8 dct
313 */
314 int neighbor_transform_size;
315
316 /**
317 * block_offset[ 0..23] for frame macroblocks
318 * block_offset[24..47] for field macroblocks
319 */
320 int block_offset[2*(16+8)];
321
322 uint32_t *mb2b_xy; //FIXME are these 4 a good idea?
323 uint32_t *mb2b8_xy;
324 int b_stride; //FIXME use s->b4_stride
325 int b8_stride;
326
327 int mb_linesize; ///< may be equal to s->linesize or s->linesize*2, for mbaff
328 int mb_uvlinesize;
329
330 int emu_edge_width;
331 int emu_edge_height;
332
333 int halfpel_flag;
334 int thirdpel_flag;
335
336 int unknown_svq3_flag;
337 int next_slice_index;
338
7978debd 339 SPS *sps_buffers[MAX_SPS_COUNT];
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340 SPS sps; ///< current sps
341
7978debd 342 PPS *pps_buffers[MAX_PPS_COUNT];
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343 /**
344 * current pps
345 */
346 PPS pps; //FIXME move to Picture perhaps? (->no) do we need that?
347
348 uint32_t dequant4_buffer[6][52][16];
349 uint32_t dequant8_buffer[2][52][64];
350 uint32_t (*dequant4_coeff[6])[16];
351 uint32_t (*dequant8_coeff[2])[64];
352 int dequant_coeff_pps; ///< reinit tables when pps changes
353
354 int slice_num;
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355 uint16_t *slice_table_base;
356 uint16_t *slice_table; ///< slice_table_base + 2*mb_stride + 1
26b4fe82 357 int slice_type;
e3e6f18f 358 int slice_type_nos; ///< S free slice type (SI/SP are remapped to I/P)
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359 int slice_type_fixed;
360
361 //interlacing specific flags
362 int mb_aff_frame;
363 int mb_field_decoding_flag;
364 int mb_mbaff; ///< mb_aff_frame && mb_field_decoding_flag
365
da2911d5 366 DECLARE_ALIGNED_8(uint16_t, sub_mb_type[4]);
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367
368 //POC stuff
369 int poc_lsb;
370 int poc_msb;
371 int delta_poc_bottom;
372 int delta_poc[2];
373 int frame_num;
374 int prev_poc_msb; ///< poc_msb of the last reference pic for POC type 0
375 int prev_poc_lsb; ///< poc_lsb of the last reference pic for POC type 0
376 int frame_num_offset; ///< for POC type 2
377 int prev_frame_num_offset; ///< for POC type 2
378 int prev_frame_num; ///< frame_num of the last pic for POC type 1/2
379
380 /**
f57e2af6 381 * frame_num for frames or 2*frame_num+1 for field pics.
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382 */
383 int curr_pic_num;
384
385 /**
386 * max_frame_num or 2*max_frame_num for field pics.
387 */
388 int max_pic_num;
389
390 //Weighted pred stuff
391 int use_weight;
392 int use_weight_chroma;
393 int luma_log2_weight_denom;
394 int chroma_log2_weight_denom;
395 int luma_weight[2][48];
396 int luma_offset[2][48];
397 int chroma_weight[2][48][2];
398 int chroma_offset[2][48][2];
399 int implicit_weight[48][48];
400
401 //deblock
402 int deblocking_filter; ///< disable_deblocking_filter_idc with 1<->0
403 int slice_alpha_c0_offset;
404 int slice_beta_offset;
405
406 int redundant_pic_count;
407
408 int direct_spatial_mv_pred;
409 int dist_scale_factor[16];
8b1fd554 410 int dist_scale_factor_field[2][32];
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411 int map_col_to_list0[2][16+32];
412 int map_col_to_list0_field[2][2][16+32];
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413
414 /**
415 * num_ref_idx_l0/1_active_minus1 + 1
416 */
417 unsigned int ref_count[2]; ///< counts frames or fields, depending on current mb mode
418 unsigned int list_count;
419 Picture *short_ref[32];
420 Picture *long_ref[32];
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421 Picture default_ref_list[2][32]; ///< base reference list for all slices of a coded picture
422 Picture ref_list[2][48]; /**< 0..15: frame refs, 16..47: mbaff field refs.
423 Reordered version of default_ref_list
424 according to picture reordering in slice header */
b735aeea 425 int ref2frm[MAX_SLICES][2][64]; ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1
64b9d48f 426 Picture *delayed_pic[MAX_DELAYED_PIC_COUNT+2]; //FIXME size?
df8a7dff 427 int outputed_poc;
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428
429 /**
430 * memory management control operations buffer.
431 */
432 MMCO mmco[MAX_MMCO_COUNT];
433 int mmco_index;
434
435 int long_ref_count; ///< number of actual long term references
436 int short_ref_count; ///< number of actual short term references
437
438 //data partitioning
439 GetBitContext intra_gb;
440 GetBitContext inter_gb;
441 GetBitContext *intra_gb_ptr;
442 GetBitContext *inter_gb_ptr;
443
ed5d7a53 444 DECLARE_ALIGNED_16(DCTELEM, mb[16*24]);
2cab6401 445 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
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446
447 /**
448 * Cabac
449 */
450 CABACContext cabac;
451 uint8_t cabac_state[460];
452 int cabac_init_idc;
453
454 /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0,1,2), 0x0? luma_cbp */
455 uint16_t *cbp_table;
456 int cbp;
457 int top_cbp;
458 int left_cbp;
459 /* chroma_pred_mode for i4x4 or i16x16, else 0 */
460 uint8_t *chroma_pred_mode_table;
461 int last_qscale_diff;
462 int16_t (*mvd_table[2])[2];
463 DECLARE_ALIGNED_8(int16_t, mvd_cache[2][5*8][2]);
464 uint8_t *direct_table;
465 uint8_t direct_cache[5*8];
466
467 uint8_t zigzag_scan[16];
468 uint8_t zigzag_scan8x8[64];
469 uint8_t zigzag_scan8x8_cavlc[64];
470 uint8_t field_scan[16];
471 uint8_t field_scan8x8[64];
472 uint8_t field_scan8x8_cavlc[64];
473 const uint8_t *zigzag_scan_q0;
474 const uint8_t *zigzag_scan8x8_q0;
475 const uint8_t *zigzag_scan8x8_cavlc_q0;
476 const uint8_t *field_scan_q0;
477 const uint8_t *field_scan8x8_q0;
478 const uint8_t *field_scan8x8_cavlc_q0;
479
480 int x264_build;
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481
482 /**
483 * @defgroup multithreading Members for slice based multithreading
484 * @{
485 */
486 struct H264Context *thread_context[MAX_THREADS];
487
488 /**
489 * current slice number, used to initalize slice_num of each thread/context
490 */
491 int current_slice;
492
493 /**
494 * Max number of threads / contexts.
495 * This is equal to AVCodecContext.thread_count unless
496 * multithreaded decoding is impossible, in which case it is
497 * reduced to 1.
498 */
499 int max_contexts;
500
501 /**
502 * 1 if the single thread fallback warning has already been
503 * displayed, 0 otherwise.
504 */
505 int single_decode_warning;
506
507 int last_slice_type;
508 /** @} */
509
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510 int mb_xy;
511
1fdcdf8d 512 uint32_t svq3_watermark_key;
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513
514 /**
515 * pic_struct in picture timing SEI message
516 */
517 SEI_PicStructType sei_pic_struct;
89db0bae 518
37a558fe 519 /**
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520 * Complement sei_pic_struct
521 * SEI_PIC_STRUCT_TOP_BOTTOM and SEI_PIC_STRUCT_BOTTOM_TOP indicate interlaced frames.
522 * However, soft telecined frames may have these values.
523 * This is used in an attempt to flag soft telecine progressive.
524 */
525 int prev_interlaced_frame;
526
527 /**
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528 * Bit set of clock types for fields/frames in picture timing SEI message.
529 * For each found ct_type, appropriate bit is set (e.g., bit 1 for
530 * interlaced).
531 */
532 int sei_ct_type;
533
534 /**
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535 * dpb_output_delay in picture timing SEI message, see H.264 C.2.2
536 */
537 int sei_dpb_output_delay;
538
539 /**
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540 * cpb_removal_delay in picture timing SEI message, see H.264 C.1.2
541 */
542 int sei_cpb_removal_delay;
543
544 /**
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545 * recovery_frame_cnt from SEI message
546 *
547 * Set to -1 if no recovery point SEI message found or to number of frames
548 * before playback synchronizes. Frames having recovery point are key
549 * frames.
550 */
551 int sei_recovery_frame_cnt;
552
89db0bae 553 int is_complex;
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554
555 int luma_weight_flag[2]; ///< 7.4.3.2 luma_weight_lX_flag
556 int chroma_weight_flag[2]; ///< 7.4.3.2 chroma_weight_lX_flag
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557
558 // Timestamp stuff
559 int sei_buffering_period_present; ///< Buffering period SEI flag
560 int initial_cpb_removal_delay[32]; ///< Initial timestamps for CPBs
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561}H264Context;
562
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563
564extern const uint8_t ff_h264_chroma_qp[52];
565
566
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567/**
568 * Decode SEI
569 */
570int ff_h264_decode_sei(H264Context *h);
571
572/**
573 * Decode SPS
574 */
575int ff_h264_decode_seq_parameter_set(H264Context *h);
576
577/**
578 * Decode PPS
579 */
580int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length);
581
582/**
583 * Decodes a network abstraction layer unit.
584 * @param consumed is the number of bytes used as input
585 * @param length is the length of the array
586 * @param dst_length is the number of decoded bytes FIXME here or a decode rbsp tailing?
587 * @returns decoded bytes, might be src+1 if no escapes
588 */
589const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src, int *dst_length, int *consumed, int length);
590
591/**
592 * identifies the exact end of the bitstream
593 * @return the length of the trailing, or 0 if damaged
594 */
595int ff_h264_decode_rbsp_trailing(H264Context *h, const uint8_t *src);
596
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597/**
598 * frees any data that may have been allocated in the H264 context like SPS, PPS etc.
599 */
cbf1eae9 600av_cold void ff_h264_free_context(H264Context *h);
15861962 601
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602/**
603 * reconstructs bitstream slice_type.
604 */
605int ff_h264_get_slice_type(H264Context *h);
606
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607/**
608 * allocates tables.
609 * needs width/height
610 */
611int ff_h264_alloc_tables(H264Context *h);
612
613/**
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614 * fills the default_ref_list.
615 */
616int ff_h264_fill_default_ref_list(H264Context *h);
617
618int ff_h264_decode_ref_pic_list_reordering(H264Context *h);
619void ff_h264_fill_mbaff_ref_list(H264Context *h);
620void ff_h264_remove_all_refs(H264Context *h);
621
622/**
623 * Executes the reference picture marking (memory management control operations).
624 */
625int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count);
626
627int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb);
628
629
630/**
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631 * checks if the top & left blocks are available if needed & changes the dc mode so it only uses the available blocks.
632 */
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633int ff_h264_check_intra4x4_pred_mode(H264Context *h);
634
635/**
636 * checks if the top & left blocks are available if needed & changes the dc mode so it only uses the available blocks.
637 */
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638int ff_h264_check_intra_pred_mode(H264Context *h, int mode);
639
640void ff_h264_write_back_intra_pred_mode(H264Context *h);
641void ff_h264_hl_decode_mb(H264Context *h);
642int ff_h264_frame_start(H264Context *h);
643av_cold int ff_h264_decode_init(AVCodecContext *avctx);
644av_cold int ff_h264_decode_end(AVCodecContext *avctx);
645
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646void ff_h264_direct_dist_scale_factor(H264Context * const h);
647void ff_h264_direct_ref_list_init(H264Context * const h);
648void ff_h264_pred_direct_motion(H264Context * const h, int *mb_type);
649
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650void ff_h264_filter_mb_fast( H264Context *h, int mb_x, int mb_y, uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr, unsigned int linesize, unsigned int uvlinesize);
651void ff_h264_filter_mb( H264Context *h, int mb_x, int mb_y, uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr, unsigned int linesize, unsigned int uvlinesize);
652
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653/**
654 * Reset SEI values at the beginning of the frame.
655 *
656 * @param h H.264 context.
657 */
658void ff_h264_reset_sei(H264Context *h);
659
660
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661/*
662o-o o-o
663 / / /
664o-o o-o
665 ,---'
666o-o o-o
667 / / /
668o-o o-o
669*/
670//This table must be here because scan8[constant] must be known at compiletime
671static const uint8_t scan8[16 + 2*4]={
672 4+1*8, 5+1*8, 4+2*8, 5+2*8,
673 6+1*8, 7+1*8, 6+2*8, 7+2*8,
674 4+3*8, 5+3*8, 4+4*8, 5+4*8,
675 6+3*8, 7+3*8, 6+4*8, 7+4*8,
676 1+1*8, 2+1*8,
677 1+2*8, 2+2*8,
678 1+4*8, 2+4*8,
679 1+5*8, 2+5*8,
680};
681
682static av_always_inline uint32_t pack16to32(int a, int b){
683#if HAVE_BIGENDIAN
684 return (b&0xFFFF) + (a<<16);
685#else
686 return (a&0xFFFF) + (b<<16);
687#endif
688}
689
690/**
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691 * gets the chroma qp.
692 */
693static inline int get_chroma_qp(H264Context *h, int t, int qscale){
694 return h->pps.chroma_qp_table[t][qscale];
695}
696
98790382 697#endif /* AVCODEC_H264_H */