Statistics
| Branch: | Revision:

ffmpeg / libavcodec / h264.h @ 82e38c29

History | View | Annotate | Download (15.8 KB)

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 libavcodec/h264.h
24
 * H.264 / AVC / MPEG4 part10 codec.
25
 * @author Michael Niedermayer <michaelni@gmx.at>
26
 */
27

    
28
#ifndef AVCODEC_H264_H
29
#define AVCODEC_H264_H
30

    
31
#include "dsputil.h"
32
#include "cabac.h"
33
#include "mpegvideo.h"
34
#include "h264pred.h"
35

    
36
#define interlaced_dct interlaced_dct_is_a_bad_name
37
#define mb_intra mb_intra_is_not_initialized_see_mb_type
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

    
54
#define MAX_DELAYED_PIC_COUNT 16
55

    
56
/* Compiling in interlaced support reduces the speed
57
 * of progressive decoding by about 2%. */
58
#define ALLOW_INTERLACE
59

    
60
#define ALLOW_NOCHROMA
61

    
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

    
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
72
#define FIELD_PICTURE (s->picture_structure != PICT_FRAME)
73
#else
74
#define MB_MBAFF 0
75
#define MB_FIELD 0
76
#define FRAME_MBAFF 0
77
#define FIELD_PICTURE 0
78
#undef  IS_INTERLACED
79
#define IS_INTERLACED(mb_type) 0
80
#endif
81
#define FIELD_OR_MBAFF_PICTURE (FRAME_MBAFF || FIELD_PICTURE)
82

    
83
#ifdef ALLOW_NOCHROMA
84
#define CHROMA h->sps.chroma_format_idc
85
#else
86
#define CHROMA 1
87
#endif
88

    
89
#define EXTENDED_SAR          255
90

    
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

    
96
/* NAL unit types */
97
enum {
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
112
};
113

    
114
/**
115
 * SEI message types
116
 */
117
typedef enum {
118
    SEI_TYPE_PIC_TIMING              =  1, ///< picture timing
119
    SEI_TYPE_USER_DATA_UNREGISTERED  =  5, ///< unregistered user data
120
    SEI_TYPE_RECOVERY_POINT          =  6  ///< recovery point (frame # to decoder sync)
121
} SEI_Type;
122

    
123
/**
124
 * pic_struct in picture timing SEI message
125
 */
126
typedef enum {
127
    SEI_PIC_STRUCT_FRAME             = 0, ///<  0: %frame
128
    SEI_PIC_STRUCT_TOP_FIELD         = 1, ///<  1: top field
129
    SEI_PIC_STRUCT_BOTTOM_FIELD      = 2, ///<  2: bottom field
130
    SEI_PIC_STRUCT_TOP_BOTTOM        = 3, ///<  3: top field, bottom field, in that order
131
    SEI_PIC_STRUCT_BOTTOM_TOP        = 4, ///<  4: bottom field, top field, in that order
132
    SEI_PIC_STRUCT_TOP_BOTTOM_TOP    = 5, ///<  5: top field, bottom field, top field repeated, in that order
133
    SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM = 6, ///<  6: bottom field, top field, bottom field repeated, in that order
134
    SEI_PIC_STRUCT_FRAME_DOUBLING    = 7, ///<  7: %frame doubling
135
    SEI_PIC_STRUCT_FRAME_TRIPLING    = 8  ///<  8: %frame tripling
136
} SEI_PicStructType;
137

    
138
/**
139
 * Sequence parameter set
140
 */
141
typedef struct SPS{
142

    
143
    int profile_idc;
144
    int level_idc;
145
    int chroma_format_idc;
146
    int transform_bypass;              ///< qpprime_y_zero_transform_bypass_flag
147
    int log2_max_frame_num;            ///< log2_max_frame_num_minus4 + 4
148
    int poc_type;                      ///< pic_order_cnt_type
149
    int log2_max_poc_lsb;              ///< log2_max_pic_order_cnt_lsb_minus4
150
    int delta_pic_order_always_zero_flag;
151
    int offset_for_non_ref_pic;
152
    int offset_for_top_to_bottom_field;
153
    int poc_cycle_length;              ///< num_ref_frames_in_pic_order_cnt_cycle
154
    int ref_frame_count;               ///< num_ref_frames
155
    int gaps_in_frame_num_allowed_flag;
156
    int mb_width;                      ///< pic_width_in_mbs_minus1 + 1
157
    int mb_height;                     ///< pic_height_in_map_units_minus1 + 1
158
    int frame_mbs_only_flag;
159
    int mb_aff;                        ///<mb_adaptive_frame_field_flag
160
    int direct_8x8_inference_flag;
161
    int crop;                   ///< frame_cropping_flag
162
    unsigned int crop_left;            ///< frame_cropping_rect_left_offset
163
    unsigned int crop_right;           ///< frame_cropping_rect_right_offset
164
    unsigned int crop_top;             ///< frame_cropping_rect_top_offset
165
    unsigned int crop_bottom;          ///< frame_cropping_rect_bottom_offset
166
    int vui_parameters_present_flag;
167
    AVRational sar;
168
    int timing_info_present_flag;
169
    uint32_t num_units_in_tick;
170
    uint32_t time_scale;
171
    int fixed_frame_rate_flag;
172
    short offset_for_ref_frame[256]; //FIXME dyn aloc?
173
    int bitstream_restriction_flag;
174
    int num_reorder_frames;
175
    int scaling_matrix_present;
176
    uint8_t scaling_matrix4[6][16];
177
    uint8_t scaling_matrix8[2][64];
178
    int nal_hrd_parameters_present_flag;
179
    int vcl_hrd_parameters_present_flag;
180
    int pic_struct_present_flag;
181
    int time_offset_length;
182
    int initial_cpb_removal_delay_length; ///< initial_cpb_removal_delay_length_minus1 +1
183
    int cpb_removal_delay_length;      ///< cpb_removal_delay_length_minus1 + 1
184
    int dpb_output_delay_length;       ///< dpb_output_delay_length_minus1 + 1
185
    int bit_depth_luma;                ///< bit_depth_luma_minus8 + 8
186
    int bit_depth_chroma;              ///< bit_depth_chroma_minus8 + 8
187
    int residual_color_transform_flag; ///< residual_colour_transform_flag
188
}SPS;
189

    
190
/**
191
 * Picture parameter set
192
 */
193
typedef struct PPS{
194
    unsigned int sps_id;
195
    int cabac;                  ///< entropy_coding_mode_flag
196
    int pic_order_present;      ///< pic_order_present_flag
197
    int slice_group_count;      ///< num_slice_groups_minus1 + 1
198
    int mb_slice_group_map_type;
199
    unsigned int ref_count[2];  ///< num_ref_idx_l0/1_active_minus1 + 1
200
    int weighted_pred;          ///< weighted_pred_flag
201
    int weighted_bipred_idc;
202
    int init_qp;                ///< pic_init_qp_minus26 + 26
203
    int init_qs;                ///< pic_init_qs_minus26 + 26
204
    int chroma_qp_index_offset[2];
205
    int deblocking_filter_parameters_present; ///< deblocking_filter_parameters_present_flag
206
    int constrained_intra_pred; ///< constrained_intra_pred_flag
207
    int redundant_pic_cnt_present; ///< redundant_pic_cnt_present_flag
208
    int transform_8x8_mode;     ///< transform_8x8_mode_flag
209
    uint8_t scaling_matrix4[6][16];
210
    uint8_t scaling_matrix8[2][64];
211
    uint8_t chroma_qp_table[2][64];  ///< pre-scaled (with chroma_qp_index_offset) version of qp_table
212
    int chroma_qp_diff;
213
}PPS;
214

    
215
/**
216
 * Memory management control operation opcode.
217
 */
218
typedef enum MMCOOpcode{
219
    MMCO_END=0,
220
    MMCO_SHORT2UNUSED,
221
    MMCO_LONG2UNUSED,
222
    MMCO_SHORT2LONG,
223
    MMCO_SET_MAX_LONG,
224
    MMCO_RESET,
225
    MMCO_LONG,
226
} MMCOOpcode;
227

    
228
/**
229
 * Memory management control operation.
230
 */
231
typedef struct MMCO{
232
    MMCOOpcode opcode;
233
    int short_pic_num;  ///< pic_num without wrapping (pic_num & max_pic_num)
234
    int long_arg;       ///< index, pic_num, or num long refs depending on opcode
235
} MMCO;
236

    
237
/**
238
 * H264Context
239
 */
240
typedef struct H264Context{
241
    MpegEncContext s;
242
    int nal_ref_idc;
243
    int nal_unit_type;
244
    uint8_t *rbsp_buffer[2];
245
    unsigned int rbsp_buffer_size[2];
246

    
247
    /**
248
      * Used to parse AVC variant of h264
249
      */
250
    int is_avc; ///< this flag is != 0 if codec is avc1
251
    int got_avcC; ///< flag used to parse avcC data only once
252
    int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
253

    
254
    int chroma_qp[2]; //QPc
255

    
256
    int prev_mb_skipped;
257
    int next_mb_skipped;
258

    
259
    //prediction stuff
260
    int chroma_pred_mode;
261
    int intra16x16_pred_mode;
262

    
263
    int top_mb_xy;
264
    int left_mb_xy[2];
265

    
266
    int8_t intra4x4_pred_mode_cache[5*8];
267
    int8_t (*intra4x4_pred_mode)[8];
268
    H264PredContext hpc;
269
    unsigned int topleft_samples_available;
270
    unsigned int top_samples_available;
271
    unsigned int topright_samples_available;
272
    unsigned int left_samples_available;
273
    uint8_t (*top_borders[2])[16+2*8];
274
    uint8_t left_border[2*(17+2*9)];
275

    
276
    /**
277
     * non zero coeff count cache.
278
     * is 64 if not available.
279
     */
280
    DECLARE_ALIGNED_8(uint8_t, non_zero_count_cache[6*8]);
281
    uint8_t (*non_zero_count)[16];
282

    
283
    /**
284
     * Motion vector cache.
285
     */
286
    DECLARE_ALIGNED_8(int16_t, mv_cache[2][5*8][2]);
287
    DECLARE_ALIGNED_8(int8_t, ref_cache[2][5*8]);
288
#define LIST_NOT_USED -1 //FIXME rename?
289
#define PART_NOT_AVAILABLE -2
290

    
291
    /**
292
     * is 1 if the specific list MV&references are set to 0,0,-2.
293
     */
294
    int mv_cache_clean[2];
295

    
296
    /**
297
     * number of neighbors (top and/or left) that used 8x8 dct
298
     */
299
    int neighbor_transform_size;
300

    
301
    /**
302
     * block_offset[ 0..23] for frame macroblocks
303
     * block_offset[24..47] for field macroblocks
304
     */
305
    int block_offset[2*(16+8)];
306

    
307
    uint32_t *mb2b_xy; //FIXME are these 4 a good idea?
308
    uint32_t *mb2b8_xy;
309
    int b_stride; //FIXME use s->b4_stride
310
    int b8_stride;
311

    
312
    int mb_linesize;   ///< may be equal to s->linesize or s->linesize*2, for mbaff
313
    int mb_uvlinesize;
314

    
315
    int emu_edge_width;
316
    int emu_edge_height;
317

    
318
    int halfpel_flag;
319
    int thirdpel_flag;
320

    
321
    int unknown_svq3_flag;
322
    int next_slice_index;
323

    
324
    SPS *sps_buffers[MAX_SPS_COUNT];
325
    SPS sps; ///< current sps
326

    
327
    PPS *pps_buffers[MAX_PPS_COUNT];
328
    /**
329
     * current pps
330
     */
331
    PPS pps; //FIXME move to Picture perhaps? (->no) do we need that?
332

    
333
    uint32_t dequant4_buffer[6][52][16];
334
    uint32_t dequant8_buffer[2][52][64];
335
    uint32_t (*dequant4_coeff[6])[16];
336
    uint32_t (*dequant8_coeff[2])[64];
337
    int dequant_coeff_pps;     ///< reinit tables when pps changes
338

    
339
    int slice_num;
340
    uint16_t *slice_table_base;
341
    uint16_t *slice_table;     ///< slice_table_base + 2*mb_stride + 1
342
    int slice_type;
343
    int slice_type_nos;        ///< S free slice type (SI/SP are remapped to I/P)
344
    int slice_type_fixed;
345

    
346
    //interlacing specific flags
347
    int mb_aff_frame;
348
    int mb_field_decoding_flag;
349
    int mb_mbaff;              ///< mb_aff_frame && mb_field_decoding_flag
350

    
351
    uint16_t sub_mb_type[4];
352

    
353
    //POC stuff
354
    int poc_lsb;
355
    int poc_msb;
356
    int delta_poc_bottom;
357
    int delta_poc[2];
358
    int frame_num;
359
    int prev_poc_msb;             ///< poc_msb of the last reference pic for POC type 0
360
    int prev_poc_lsb;             ///< poc_lsb of the last reference pic for POC type 0
361
    int frame_num_offset;         ///< for POC type 2
362
    int prev_frame_num_offset;    ///< for POC type 2
363
    int prev_frame_num;           ///< frame_num of the last pic for POC type 1/2
364

    
365
    /**
366
     * frame_num for frames or 2*frame_num+1 for field pics.
367
     */
368
    int curr_pic_num;
369

    
370
    /**
371
     * max_frame_num or 2*max_frame_num for field pics.
372
     */
373
    int max_pic_num;
374

    
375
    //Weighted pred stuff
376
    int use_weight;
377
    int use_weight_chroma;
378
    int luma_log2_weight_denom;
379
    int chroma_log2_weight_denom;
380
    int luma_weight[2][48];
381
    int luma_offset[2][48];
382
    int chroma_weight[2][48][2];
383
    int chroma_offset[2][48][2];
384
    int implicit_weight[48][48];
385

    
386
    //deblock
387
    int deblocking_filter;         ///< disable_deblocking_filter_idc with 1<->0
388
    int slice_alpha_c0_offset;
389
    int slice_beta_offset;
390

    
391
    int redundant_pic_count;
392

    
393
    int direct_spatial_mv_pred;
394
    int dist_scale_factor[16];
395
    int dist_scale_factor_field[2][32];
396
    int map_col_to_list0[2][16+32];
397
    int map_col_to_list0_field[2][2][16+32];
398

    
399
    /**
400
     * num_ref_idx_l0/1_active_minus1 + 1
401
     */
402
    unsigned int ref_count[2];   ///< counts frames or fields, depending on current mb mode
403
    unsigned int list_count;
404
    Picture *short_ref[32];
405
    Picture *long_ref[32];
406
    Picture default_ref_list[2][32]; ///< base reference list for all slices of a coded picture
407
    Picture ref_list[2][48];         /**< 0..15: frame refs, 16..47: mbaff field refs.
408
                                          Reordered version of default_ref_list
409
                                          according to picture reordering in slice header */
410
    int ref2frm[MAX_SLICES][2][64];  ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1
411
    Picture *delayed_pic[MAX_DELAYED_PIC_COUNT+2]; //FIXME size?
412
    int outputed_poc;
413

    
414
    /**
415
     * memory management control operations buffer.
416
     */
417
    MMCO mmco[MAX_MMCO_COUNT];
418
    int mmco_index;
419

    
420
    int long_ref_count;  ///< number of actual long term references
421
    int short_ref_count; ///< number of actual short term references
422

    
423
    //data partitioning
424
    GetBitContext intra_gb;
425
    GetBitContext inter_gb;
426
    GetBitContext *intra_gb_ptr;
427
    GetBitContext *inter_gb_ptr;
428

    
429
    DECLARE_ALIGNED_16(DCTELEM, mb[16*24]);
430
    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
431

    
432
    /**
433
     * Cabac
434
     */
435
    CABACContext cabac;
436
    uint8_t      cabac_state[460];
437
    int          cabac_init_idc;
438

    
439
    /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0,1,2), 0x0? luma_cbp */
440
    uint16_t     *cbp_table;
441
    int cbp;
442
    int top_cbp;
443
    int left_cbp;
444
    /* chroma_pred_mode for i4x4 or i16x16, else 0 */
445
    uint8_t     *chroma_pred_mode_table;
446
    int         last_qscale_diff;
447
    int16_t     (*mvd_table[2])[2];
448
    DECLARE_ALIGNED_8(int16_t, mvd_cache[2][5*8][2]);
449
    uint8_t     *direct_table;
450
    uint8_t     direct_cache[5*8];
451

    
452
    uint8_t zigzag_scan[16];
453
    uint8_t zigzag_scan8x8[64];
454
    uint8_t zigzag_scan8x8_cavlc[64];
455
    uint8_t field_scan[16];
456
    uint8_t field_scan8x8[64];
457
    uint8_t field_scan8x8_cavlc[64];
458
    const uint8_t *zigzag_scan_q0;
459
    const uint8_t *zigzag_scan8x8_q0;
460
    const uint8_t *zigzag_scan8x8_cavlc_q0;
461
    const uint8_t *field_scan_q0;
462
    const uint8_t *field_scan8x8_q0;
463
    const uint8_t *field_scan8x8_cavlc_q0;
464

    
465
    int x264_build;
466

    
467
    /**
468
     * @defgroup multithreading Members for slice based multithreading
469
     * @{
470
     */
471
    struct H264Context *thread_context[MAX_THREADS];
472

    
473
    /**
474
     * current slice number, used to initalize slice_num of each thread/context
475
     */
476
    int current_slice;
477

    
478
    /**
479
     * Max number of threads / contexts.
480
     * This is equal to AVCodecContext.thread_count unless
481
     * multithreaded decoding is impossible, in which case it is
482
     * reduced to 1.
483
     */
484
    int max_contexts;
485

    
486
    /**
487
     *  1 if the single thread fallback warning has already been
488
     *  displayed, 0 otherwise.
489
     */
490
    int single_decode_warning;
491

    
492
    int last_slice_type;
493
    /** @} */
494

    
495
    int mb_xy;
496

    
497
    uint32_t svq3_watermark_key;
498

    
499
    /**
500
     * pic_struct in picture timing SEI message
501
     */
502
    SEI_PicStructType sei_pic_struct;
503

    
504
    /**
505
     * recovery_frame_cnt from SEI message
506
     *
507
     * Set to -1 if no recovery point SEI message found or to number of frames
508
     * before playback synchronizes. Frames having recovery point are key
509
     * frames.
510
     */
511
    int sei_recovery_frame_cnt;
512

    
513
    int is_complex;
514

    
515
    int luma_weight_flag[2];   ///< 7.4.3.2 luma_weight_lX_flag
516
    int chroma_weight_flag[2]; ///< 7.4.3.2 chroma_weight_lX_flag
517
}H264Context;
518

    
519
#endif /* AVCODEC_H264_H */