Statistics
| Branch: | Revision:

ffmpeg / libavcodec / h264.h @ 042ef4b7

History | View | Annotate | Download (11.6 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 h264.h
24
 * H.264 / AVC / MPEG4 part10 codec.
25
 * @author Michael Niedermayer <michaelni@gmx.at>
26
 */
27

    
28
#ifndef H264_H
29
#define H264_H
30

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

    
35
#define interlaced_dct interlaced_dct_is_a_bad_name
36
#define mb_intra mb_intra_is_not_initialized_see_mb_type
37

    
38
#define LUMA_DC_BLOCK_INDEX   25
39
#define CHROMA_DC_BLOCK_INDEX 26
40

    
41
#define CHROMA_DC_COEFF_TOKEN_VLC_BITS 8
42
#define COEFF_TOKEN_VLC_BITS           8
43
#define TOTAL_ZEROS_VLC_BITS           9
44
#define CHROMA_DC_TOTAL_ZEROS_VLC_BITS 3
45
#define RUN_VLC_BITS                   3
46
#define RUN7_VLC_BITS                  6
47

    
48
#define MAX_SPS_COUNT 32
49
#define MAX_PPS_COUNT 256
50

    
51
#define MAX_MMCO_COUNT 66
52

    
53
/* Compiling in interlaced support reduces the speed
54
 * of progressive decoding by about 2%. */
55
#define ALLOW_INTERLACE
56

    
57
#ifdef ALLOW_INTERLACE
58
#define MB_MBAFF h->mb_mbaff
59
#define MB_FIELD h->mb_field_decoding_flag
60
#define FRAME_MBAFF h->mb_aff_frame
61
#else
62
#define MB_MBAFF 0
63
#define MB_FIELD 0
64
#define FRAME_MBAFF 0
65
#undef  IS_INTERLACED
66
#define IS_INTERLACED(mb_type) 0
67
#endif
68

    
69
/**
70
 * Sequence parameter set
71
 */
72
typedef struct SPS{
73

    
74
    int profile_idc;
75
    int level_idc;
76
    int transform_bypass;              ///< qpprime_y_zero_transform_bypass_flag
77
    int log2_max_frame_num;            ///< log2_max_frame_num_minus4 + 4
78
    int poc_type;                      ///< pic_order_cnt_type
79
    int log2_max_poc_lsb;              ///< log2_max_pic_order_cnt_lsb_minus4
80
    int delta_pic_order_always_zero_flag;
81
    int offset_for_non_ref_pic;
82
    int offset_for_top_to_bottom_field;
83
    int poc_cycle_length;              ///< num_ref_frames_in_pic_order_cnt_cycle
84
    int ref_frame_count;               ///< num_ref_frames
85
    int gaps_in_frame_num_allowed_flag;
86
    int mb_width;                      ///< frame_width_in_mbs_minus1 + 1
87
    int mb_height;                     ///< frame_height_in_mbs_minus1 + 1
88
    int frame_mbs_only_flag;
89
    int mb_aff;                        ///<mb_adaptive_frame_field_flag
90
    int direct_8x8_inference_flag;
91
    int crop;                   ///< frame_cropping_flag
92
    int crop_left;              ///< frame_cropping_rect_left_offset
93
    int crop_right;             ///< frame_cropping_rect_right_offset
94
    int crop_top;               ///< frame_cropping_rect_top_offset
95
    int crop_bottom;            ///< frame_cropping_rect_bottom_offset
96
    int vui_parameters_present_flag;
97
    AVRational sar;
98
    int timing_info_present_flag;
99
    uint32_t num_units_in_tick;
100
    uint32_t time_scale;
101
    int fixed_frame_rate_flag;
102
    short offset_for_ref_frame[256]; //FIXME dyn aloc?
103
    int bitstream_restriction_flag;
104
    int num_reorder_frames;
105
    int scaling_matrix_present;
106
    uint8_t scaling_matrix4[6][16];
107
    uint8_t scaling_matrix8[2][64];
108
}SPS;
109

    
110
/**
111
 * Picture parameter set
112
 */
113
typedef struct PPS{
114
    unsigned int sps_id;
115
    int cabac;                  ///< entropy_coding_mode_flag
116
    int pic_order_present;      ///< pic_order_present_flag
117
    int slice_group_count;      ///< num_slice_groups_minus1 + 1
118
    int mb_slice_group_map_type;
119
    unsigned int ref_count[2];  ///< num_ref_idx_l0/1_active_minus1 + 1
120
    int weighted_pred;          ///< weighted_pred_flag
121
    int weighted_bipred_idc;
122
    int init_qp;                ///< pic_init_qp_minus26 + 26
123
    int init_qs;                ///< pic_init_qs_minus26 + 26
124
    int chroma_qp_index_offset;
125
    int deblocking_filter_parameters_present; ///< deblocking_filter_parameters_present_flag
126
    int constrained_intra_pred; ///< constrained_intra_pred_flag
127
    int redundant_pic_cnt_present; ///< redundant_pic_cnt_present_flag
128
    int transform_8x8_mode;     ///< transform_8x8_mode_flag
129
    uint8_t scaling_matrix4[6][16];
130
    uint8_t scaling_matrix8[2][64];
131
    uint8_t chroma_qp_table[256];  ///< pre-scaled (with chroma_qp_index_offset) version of qp_table
132
}PPS;
133

    
134
/**
135
 * Memory management control operation opcode.
136
 */
137
typedef enum MMCOOpcode{
138
    MMCO_END=0,
139
    MMCO_SHORT2UNUSED,
140
    MMCO_LONG2UNUSED,
141
    MMCO_SHORT2LONG,
142
    MMCO_SET_MAX_LONG,
143
    MMCO_RESET,
144
    MMCO_LONG,
145
} MMCOOpcode;
146

    
147
/**
148
 * Memory management control operation.
149
 */
150
typedef struct MMCO{
151
    MMCOOpcode opcode;
152
    int short_frame_num;
153
    int long_index;
154
} MMCO;
155

    
156
/**
157
 * H264Context
158
 */
159
typedef struct H264Context{
160
    MpegEncContext s;
161
    int nal_ref_idc;
162
    int nal_unit_type;
163
    uint8_t *rbsp_buffer[2];
164
    unsigned int rbsp_buffer_size[2];
165

    
166
    /**
167
      * Used to parse AVC variant of h264
168
      */
169
    int is_avc; ///< this flag is != 0 if codec is avc1
170
    int got_avcC; ///< flag used to parse avcC data only once
171
    int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
172

    
173
    int chroma_qp; //QPc
174

    
175
    int prev_mb_skipped;
176
    int next_mb_skipped;
177

    
178
    //prediction stuff
179
    int chroma_pred_mode;
180
    int intra16x16_pred_mode;
181

    
182
    int top_mb_xy;
183
    int left_mb_xy[2];
184

    
185
    int8_t intra4x4_pred_mode_cache[5*8];
186
    int8_t (*intra4x4_pred_mode)[8];
187
    void (*pred4x4  [9+3])(uint8_t *src, uint8_t *topright, int stride);//FIXME move to dsp?
188
    void (*pred8x8l [9+3])(uint8_t *src, int topleft, int topright, int stride);
189
    void (*pred8x8  [4+3])(uint8_t *src, int stride);
190
    void (*pred16x16[4+3])(uint8_t *src, int stride);
191
    unsigned int topleft_samples_available;
192
    unsigned int top_samples_available;
193
    unsigned int topright_samples_available;
194
    unsigned int left_samples_available;
195
    uint8_t (*top_borders[2])[16+2*8];
196
    uint8_t left_border[2*(17+2*9)];
197

    
198
    /**
199
     * non zero coeff count cache.
200
     * is 64 if not available.
201
     */
202
    DECLARE_ALIGNED_8(uint8_t, non_zero_count_cache[6*8]);
203
    uint8_t (*non_zero_count)[16];
204

    
205
    /**
206
     * Motion vector cache.
207
     */
208
    DECLARE_ALIGNED_8(int16_t, mv_cache[2][5*8][2]);
209
    DECLARE_ALIGNED_8(int8_t, ref_cache[2][5*8]);
210
#define LIST_NOT_USED -1 //FIXME rename?
211
#define PART_NOT_AVAILABLE -2
212

    
213
    /**
214
     * is 1 if the specific list MV&references are set to 0,0,-2.
215
     */
216
    int mv_cache_clean[2];
217

    
218
    /**
219
     * number of neighbors (top and/or left) that used 8x8 dct
220
     */
221
    int neighbor_transform_size;
222

    
223
    /**
224
     * block_offset[ 0..23] for frame macroblocks
225
     * block_offset[24..47] for field macroblocks
226
     */
227
    int block_offset[2*(16+8)];
228

    
229
    uint32_t *mb2b_xy; //FIXME are these 4 a good idea?
230
    uint32_t *mb2b8_xy;
231
    int b_stride; //FIXME use s->b4_stride
232
    int b8_stride;
233

    
234
    int mb_linesize;   ///< may be equal to s->linesize or s->linesize*2, for mbaff
235
    int mb_uvlinesize;
236

    
237
    int emu_edge_width;
238
    int emu_edge_height;
239

    
240
    int halfpel_flag;
241
    int thirdpel_flag;
242

    
243
    int unknown_svq3_flag;
244
    int next_slice_index;
245

    
246
    SPS *sps_buffers[MAX_SPS_COUNT];
247
    SPS sps; ///< current sps
248

    
249
    PPS *pps_buffers[MAX_PPS_COUNT];
250
    /**
251
     * current pps
252
     */
253
    PPS pps; //FIXME move to Picture perhaps? (->no) do we need that?
254

    
255
    uint32_t dequant4_buffer[6][52][16];
256
    uint32_t dequant8_buffer[2][52][64];
257
    uint32_t (*dequant4_coeff[6])[16];
258
    uint32_t (*dequant8_coeff[2])[64];
259
    int dequant_coeff_pps;     ///< reinit tables when pps changes
260

    
261
    int slice_num;
262
    uint8_t *slice_table_base;
263
    uint8_t *slice_table;      ///< slice_table_base + 2*mb_stride + 1
264
    int slice_type;
265
    int slice_type_fixed;
266

    
267
    //interlacing specific flags
268
    int mb_aff_frame;
269
    int mb_field_decoding_flag;
270
    int mb_mbaff;              ///< mb_aff_frame && mb_field_decoding_flag
271

    
272
    unsigned int sub_mb_type[4];
273

    
274
    //POC stuff
275
    int poc_lsb;
276
    int poc_msb;
277
    int delta_poc_bottom;
278
    int delta_poc[2];
279
    int frame_num;
280
    int prev_poc_msb;             ///< poc_msb of the last reference pic for POC type 0
281
    int prev_poc_lsb;             ///< poc_lsb of the last reference pic for POC type 0
282
    int frame_num_offset;         ///< for POC type 2
283
    int prev_frame_num_offset;    ///< for POC type 2
284
    int prev_frame_num;           ///< frame_num of the last pic for POC type 1/2
285

    
286
    /**
287
     * frame_num for frames or 2*frame_num for field pics.
288
     */
289
    int curr_pic_num;
290

    
291
    /**
292
     * max_frame_num or 2*max_frame_num for field pics.
293
     */
294
    int max_pic_num;
295

    
296
    //Weighted pred stuff
297
    int use_weight;
298
    int use_weight_chroma;
299
    int luma_log2_weight_denom;
300
    int chroma_log2_weight_denom;
301
    int luma_weight[2][48];
302
    int luma_offset[2][48];
303
    int chroma_weight[2][48][2];
304
    int chroma_offset[2][48][2];
305
    int implicit_weight[48][48];
306

    
307
    //deblock
308
    int deblocking_filter;         ///< disable_deblocking_filter_idc with 1<->0
309
    int slice_alpha_c0_offset;
310
    int slice_beta_offset;
311

    
312
    int redundant_pic_count;
313

    
314
    int direct_spatial_mv_pred;
315
    int dist_scale_factor[16];
316
    int dist_scale_factor_field[32];
317
    int map_col_to_list0[2][16];
318
    int map_col_to_list0_field[2][32];
319

    
320
    /**
321
     * num_ref_idx_l0/1_active_minus1 + 1
322
     */
323
    unsigned int ref_count[2];   ///< counts frames or fields, depending on current mb mode
324
    unsigned int list_count;
325
    Picture *short_ref[32];
326
    Picture *long_ref[32];
327
    Picture default_ref_list[2][32];
328
    Picture ref_list[2][48];     ///< 0..15: frame refs, 16..47: mbaff field refs
329
    Picture *delayed_pic[18]; //FIXME size?
330
    Picture *delayed_output_pic;
331

    
332
    /**
333
     * memory management control operations buffer.
334
     */
335
    MMCO mmco[MAX_MMCO_COUNT];
336
    int mmco_index;
337

    
338
    int long_ref_count;  ///< number of actual long term references
339
    int short_ref_count; ///< number of actual short term references
340

    
341
    //data partitioning
342
    GetBitContext intra_gb;
343
    GetBitContext inter_gb;
344
    GetBitContext *intra_gb_ptr;
345
    GetBitContext *inter_gb_ptr;
346

    
347
    DECLARE_ALIGNED_8(DCTELEM, mb[16*24]);
348
    DCTELEM mb_padding[256];        ///< as mb is addressed by scantable[i] and scantable is uint8_t we can either check that i is not to large or ensure that there is some unused stuff after mb
349

    
350
    /**
351
     * Cabac
352
     */
353
    CABACContext cabac;
354
    uint8_t      cabac_state[460];
355
    int          cabac_init_idc;
356

    
357
    /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0,1,2), 0x0? luma_cbp */
358
    uint16_t     *cbp_table;
359
    int cbp;
360
    int top_cbp;
361
    int left_cbp;
362
    /* chroma_pred_mode for i4x4 or i16x16, else 0 */
363
    uint8_t     *chroma_pred_mode_table;
364
    int         last_qscale_diff;
365
    int16_t     (*mvd_table[2])[2];
366
    DECLARE_ALIGNED_8(int16_t, mvd_cache[2][5*8][2]);
367
    uint8_t     *direct_table;
368
    uint8_t     direct_cache[5*8];
369

    
370
    uint8_t zigzag_scan[16];
371
    uint8_t zigzag_scan8x8[64];
372
    uint8_t zigzag_scan8x8_cavlc[64];
373
    uint8_t field_scan[16];
374
    uint8_t field_scan8x8[64];
375
    uint8_t field_scan8x8_cavlc[64];
376
    const uint8_t *zigzag_scan_q0;
377
    const uint8_t *zigzag_scan8x8_q0;
378
    const uint8_t *zigzag_scan8x8_cavlc_q0;
379
    const uint8_t *field_scan_q0;
380
    const uint8_t *field_scan8x8_q0;
381
    const uint8_t *field_scan8x8_cavlc_q0;
382

    
383
    int x264_build;
384
}H264Context;
385

    
386
#endif /* H264_H */