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mpegvideo.h
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1 /*
2  * Generic DCT based hybrid video encoder
3  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4  * Copyright (c) 2002-2004 Michael Niedermayer
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * mpegvideo header.
26  */
27 
28 #ifndef AVCODEC_MPEGVIDEO_H
29 #define AVCODEC_MPEGVIDEO_H
30 
31 #include "avcodec.h"
32 #include "dsputil.h"
33 #include "error_resilience.h"
34 #include "get_bits.h"
35 #include "h264chroma.h"
36 #include "hpeldsp.h"
37 #include "put_bits.h"
38 #include "ratecontrol.h"
39 #include "parser.h"
40 #include "mpeg12data.h"
41 #include "rl.h"
42 #include "thread.h"
43 #include "videodsp.h"
44 
45 #include "libavutil/opt.h"
46 #include "libavutil/timecode.h"
47 
48 #define FRAME_SKIPPED 100 ///< return value for header parsers if frame is not coded
49 
50 enum OutputFormat {
51  FMT_MPEG1,
52  FMT_H261,
53  FMT_H263,
54  FMT_MJPEG,
55 };
56 
57 #define MPEG_BUF_SIZE (16 * 1024)
58 
59 #define QMAT_SHIFT_MMX 16
60 #define QMAT_SHIFT 21
61 
62 #define MAX_FCODE 7
63 #define MAX_MV 4096
64 
65 #define MAX_THREADS 32
66 #define MAX_PICTURE_COUNT 36
67 
68 #define ME_MAP_SIZE 64
69 #define ME_MAP_SHIFT 3
70 #define ME_MAP_MV_BITS 11
71 
72 #define MAX_MB_BYTES (30*16*16*3/8 + 120)
73 
74 #define INPLACE_OFFSET 16
75 
76 /* Start codes. */
77 #define SEQ_END_CODE 0x000001b7
78 #define SEQ_START_CODE 0x000001b3
79 #define GOP_START_CODE 0x000001b8
80 #define PICTURE_START_CODE 0x00000100
81 #define SLICE_MIN_START_CODE 0x00000101
82 #define SLICE_MAX_START_CODE 0x000001af
83 #define EXT_START_CODE 0x000001b5
84 #define USER_START_CODE 0x000001b2
85 
86 /**
87  * Value of Picture.reference when Picture is not a reference picture, but
88  * is held for delayed output.
89  */
90 #define DELAYED_PIC_REF 4
91 
92 struct MpegEncContext;
93 
94 /**
95  * Picture.
96  */
97 typedef struct Picture{
98  struct AVFrame f;
99  ThreadFrame tf;
100 
101  AVBufferRef *qscale_table_buf;
102  int8_t *qscale_table;
103 
104  AVBufferRef *motion_val_buf[2];
105  int16_t (*motion_val[2])[2];
106 
107  AVBufferRef *mb_type_buf;
108  uint32_t *mb_type;
109 
110  AVBufferRef *mbskip_table_buf;
111  uint8_t *mbskip_table;
112 
113  AVBufferRef *ref_index_buf[2];
114  int8_t *ref_index[2];
115 
116  AVBufferRef *mb_var_buf;
117  uint16_t *mb_var; ///< Table for MB variances
118 
119  AVBufferRef *mc_mb_var_buf;
120  uint16_t *mc_mb_var; ///< Table for motion compensated MB variances
121 
122  int alloc_mb_width; ///< mb_width used to allocate tables
123  int alloc_mb_height; ///< mb_height used to allocate tables
124 
125  AVBufferRef *mb_mean_buf;
126  uint8_t *mb_mean; ///< Table for MB luminance
127 
128  AVBufferRef *hwaccel_priv_buf;
129  /**
130  * hardware accelerator private data
131  */
132  void *hwaccel_picture_private;
133 
134 #define MB_TYPE_INTRA MB_TYPE_INTRA4x4 //default mb_type if there is just one type
135 #define IS_INTRA4x4(a) ((a)&MB_TYPE_INTRA4x4)
136 #define IS_INTRA16x16(a) ((a)&MB_TYPE_INTRA16x16)
137 #define IS_PCM(a) ((a)&MB_TYPE_INTRA_PCM)
138 #define IS_INTRA(a) ((a)&7)
139 #define IS_INTER(a) ((a)&(MB_TYPE_16x16|MB_TYPE_16x8|MB_TYPE_8x16|MB_TYPE_8x8))
140 #define IS_SKIP(a) ((a)&MB_TYPE_SKIP)
141 #define IS_INTRA_PCM(a) ((a)&MB_TYPE_INTRA_PCM)
142 #define IS_INTERLACED(a) ((a)&MB_TYPE_INTERLACED)
143 #define IS_DIRECT(a) ((a)&MB_TYPE_DIRECT2)
144 #define IS_GMC(a) ((a)&MB_TYPE_GMC)
145 #define IS_16X16(a) ((a)&MB_TYPE_16x16)
146 #define IS_16X8(a) ((a)&MB_TYPE_16x8)
147 #define IS_8X16(a) ((a)&MB_TYPE_8x16)
148 #define IS_8X8(a) ((a)&MB_TYPE_8x8)
149 #define IS_SUB_8X8(a) ((a)&MB_TYPE_16x16) //note reused
150 #define IS_SUB_8X4(a) ((a)&MB_TYPE_16x8) //note reused
151 #define IS_SUB_4X8(a) ((a)&MB_TYPE_8x16) //note reused
152 #define IS_SUB_4X4(a) ((a)&MB_TYPE_8x8) //note reused
153 #define IS_ACPRED(a) ((a)&MB_TYPE_ACPRED)
154 #define IS_QUANT(a) ((a)&MB_TYPE_QUANT)
155 #define IS_DIR(a, part, list) ((a) & (MB_TYPE_P0L0<<((part)+2*(list))))
156 #define USES_LIST(a, list) ((a) & ((MB_TYPE_P0L0|MB_TYPE_P1L0)<<(2*(list)))) ///< does this mb use listX, note does not work if subMBs
157 #define HAS_CBP(a) ((a)&MB_TYPE_CBP)
158 
159  int field_poc[2]; ///< h264 top/bottom POC
160  int poc; ///< h264 frame POC
161  int frame_num; ///< h264 frame_num (raw frame_num from slice header)
162  int mmco_reset; ///< h264 MMCO_RESET set this 1. Reordering code must not mix pictures before and after MMCO_RESET.
163  int pic_id; /**< h264 pic_num (short -> no wrap version of pic_num,
164  pic_num & max_pic_num; long -> long_pic_num) */
165  int long_ref; ///< 1->long term reference 0->short term reference
166  int ref_poc[2][2][32]; ///< h264 POCs of the frames/fields used as reference (FIXME need per slice)
167  int ref_count[2][2]; ///< number of entries in ref_poc (FIXME need per slice)
168  int mbaff; ///< h264 1 -> MBAFF frame 0-> not MBAFF
169  int field_picture; ///< whether or not the picture was encoded in separate fields
170  int sync; ///< has been decoded after a keyframe
171 
172  int mb_var_sum; ///< sum of MB variance for current frame
173  int mc_mb_var_sum; ///< motion compensated MB variance for current frame
174 
175  int b_frame_score;
176  int needs_realloc; ///< Picture needs to be reallocated (eg due to a frame size change)
177 
178  int reference;
179  int shared;
180 
181  int crop;
182  int crop_left;
183  int crop_top;
184 } Picture;
185 
186 /**
187  * Motion estimation context.
188  */
189 typedef struct MotionEstContext{
190  AVCodecContext *avctx;
191  int skip; ///< set if ME is skipped for the current MB
192  int co_located_mv[4][2]; ///< mv from last P-frame for direct mode ME
193  int direct_basis_mv[4][2];
194  uint8_t *scratchpad; ///< data area for the ME algo, so that the ME does not need to malloc/free
195  uint8_t *best_mb;
196  uint8_t *temp_mb[2];
197  uint8_t *temp;
198  int best_bits;
199  uint32_t *map; ///< map to avoid duplicate evaluations
200  uint32_t *score_map; ///< map to store the scores
201  unsigned map_generation;
202  int pre_penalty_factor;
203  int penalty_factor; /**< an estimate of the bits required to
204  code a given mv value, e.g. (1,0) takes
205  more bits than (0,0). We have to
206  estimate whether any reduction in
207  residual is worth the extra bits. */
208  int sub_penalty_factor;
209  int mb_penalty_factor;
210  int flags;
211  int sub_flags;
212  int mb_flags;
213  int pre_pass; ///< = 1 for the pre pass
214  int dia_size;
215  int xmin;
216  int xmax;
217  int ymin;
218  int ymax;
219  int pred_x;
220  int pred_y;
221  uint8_t *src[4][4];
222  uint8_t *ref[4][4];
223  int stride;
224  int uvstride;
225  /* temp variables for picture complexity calculation */
226  int mc_mb_var_sum_temp;
227  int mb_var_sum_temp;
228  int scene_change_score;
229 /* cmp, chroma_cmp;*/
230  op_pixels_func (*hpel_put)[4];
231  op_pixels_func (*hpel_avg)[4];
232  qpel_mc_func (*qpel_put)[16];
233  qpel_mc_func (*qpel_avg)[16];
234  uint8_t (*mv_penalty)[MAX_MV*2+1]; ///< amount of bits needed to encode a MV
235  uint8_t *current_mv_penalty;
236  int (*sub_motion_search)(struct MpegEncContext * s,
237  int *mx_ptr, int *my_ptr, int dmin,
238  int src_index, int ref_index,
239  int size, int h);
240 }MotionEstContext;
241 
242 /**
243  * MpegEncContext.
244  */
245 typedef struct MpegEncContext {
246  AVClass *class;
247  struct AVCodecContext *avctx;
248  /* the following parameters must be initialized before encoding */
249  int width, height;///< picture size. must be a multiple of 16
250  int gop_size;
251  int intra_only; ///< if true, only intra pictures are generated
252  int bit_rate; ///< wanted bit rate
253  enum OutputFormat out_format; ///< output format
254  int h263_pred; ///< use mpeg4/h263 ac/dc predictions
255  int pb_frame; ///< PB frame mode (0 = none, 1 = base, 2 = improved)
256 
257 /* the following codec id fields are deprecated in favor of codec_id */
258  int h263_plus; ///< h263 plus headers
259  int h263_flv; ///< use flv h263 header
260 
261  enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
262  int fixed_qscale; ///< fixed qscale if non zero
263  int encoding; ///< true if we are encoding (vs decoding)
264  int flags; ///< AVCodecContext.flags (HQ, MV4, ...)
265  int flags2; ///< AVCodecContext.flags2
266  int max_b_frames; ///< max number of b-frames for encoding
267  int luma_elim_threshold;
268  int chroma_elim_threshold;
269  int strict_std_compliance; ///< strictly follow the std (MPEG4, ...)
270  int workaround_bugs; ///< workaround bugs in encoders which cannot be detected automatically
271  int codec_tag; ///< internal codec_tag upper case converted from avctx codec_tag
272  int stream_codec_tag; ///< internal stream_codec_tag upper case converted from avctx stream_codec_tag
273  /* the following fields are managed internally by the encoder */
274 
275  /* sequence parameters */
276  int context_initialized;
277  int input_picture_number; ///< used to set pic->display_picture_number, should not be used for/by anything else
278  int coded_picture_number; ///< used to set pic->coded_picture_number, should not be used for/by anything else
279  int picture_number; //FIXME remove, unclear definition
280  int picture_in_gop_number; ///< 0-> first pic in gop, ...
281  int mb_width, mb_height; ///< number of MBs horizontally & vertically
282  int mb_stride; ///< mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11
283  int b8_stride; ///< 2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
284  int b4_stride; ///< 4*mb_width+1 used for some 4x4 block arrays to allow simple addressing
285  int h_edge_pos, v_edge_pos;///< horizontal / vertical position of the right/bottom edge (pixel replication)
286  int mb_num; ///< number of MBs of a picture
287  ptrdiff_t linesize; ///< line size, in bytes, may be different from width
288  ptrdiff_t uvlinesize; ///< line size, for chroma in bytes, may be different from width
289  Picture *picture; ///< main picture buffer
290  Picture **input_picture; ///< next pictures on display order for encoding
291  Picture **reordered_input_picture; ///< pointer to the next pictures in codedorder for encoding
292 
293  int y_dc_scale, c_dc_scale;
294  int ac_pred;
295  int block_last_index[12]; ///< last non zero coefficient in block
296  int h263_aic; ///< Advanded INTRA Coding (AIC)
297 
298  /* scantables */
299  ScanTable inter_scantable; ///< if inter == intra then intra should be used to reduce tha cache usage
300  ScanTable intra_scantable;
301  ScanTable intra_h_scantable;
302  ScanTable intra_v_scantable;
303 
304  /* WARNING: changes above this line require updates to hardcoded
305  * offsets used in asm. */
306 
307  int64_t user_specified_pts; ///< last non-zero pts from AVFrame which was passed into avcodec_encode_video2()
308  /**
309  * pts difference between the first and second input frame, used for
310  * calculating dts of the first frame when there's a delay */
311  int64_t dts_delta;
312  /**
313  * reordered pts to be used as dts for the next output frame when there's
314  * a delay */
315  int64_t reordered_pts;
316 
317  /** bit output */
318  PutBitContext pb;
319 
320  int start_mb_y; ///< start mb_y of this thread (so current thread should process start_mb_y <= row < end_mb_y)
321  int end_mb_y; ///< end mb_y of this thread (so current thread should process start_mb_y <= row < end_mb_y)
322  struct MpegEncContext *thread_context[MAX_THREADS];
323  int slice_context_count; ///< number of used thread_contexts
324 
325  /**
326  * copy of the previous picture structure.
327  * note, linesize & data, might not match the previous picture (for field pictures)
328  */
329  Picture last_picture;
330 
331  /**
332  * copy of the next picture structure.
333  * note, linesize & data, might not match the next picture (for field pictures)
334  */
335  Picture next_picture;
336 
337  /**
338  * copy of the source picture structure for encoding.
339  * note, linesize & data, might not match the source picture (for field pictures)
340  */
341  Picture new_picture;
342 
343  /**
344  * copy of the current picture structure.
345  * note, linesize & data, might not match the current picture (for field pictures)
346  */
347  Picture current_picture; ///< buffer to store the decompressed current picture
348 
349  Picture *last_picture_ptr; ///< pointer to the previous picture.
350  Picture *next_picture_ptr; ///< pointer to the next picture (for bidir pred)
351  Picture *current_picture_ptr; ///< pointer to the current picture
352  int last_dc[3]; ///< last DC values for MPEG1
353  int16_t *dc_val_base;
354  int16_t *dc_val[3]; ///< used for mpeg4 DC prediction, all 3 arrays must be continuous
355  const uint8_t *y_dc_scale_table; ///< qscale -> y_dc_scale table
356  const uint8_t *c_dc_scale_table; ///< qscale -> c_dc_scale table
357  const uint8_t *chroma_qscale_table; ///< qscale -> chroma_qscale (h263)
358  uint8_t *coded_block_base;
359  uint8_t *coded_block; ///< used for coded block pattern prediction (msmpeg4v3, wmv1)
360  int16_t (*ac_val_base)[16];
361  int16_t (*ac_val[3])[16]; ///< used for mpeg4 AC prediction, all 3 arrays must be continuous
362  int mb_skipped; ///< MUST BE SET only during DECODING
363  uint8_t *mbskip_table; /**< used to avoid copy if macroblock skipped (for black regions for example)
364  and used for b-frame encoding & decoding (contains skip table of next P Frame) */
365  uint8_t *mbintra_table; ///< used to avoid setting {ac, dc, cbp}-pred stuff to zero on inter MB decoding
366  uint8_t *cbp_table; ///< used to store cbp, ac_pred for partitioned decoding
367  uint8_t *pred_dir_table; ///< used to store pred_dir for partitioned decoding
368  uint8_t *edge_emu_buffer; ///< temporary buffer for if MVs point to out-of-frame data
369  uint8_t *rd_scratchpad; ///< scratchpad for rate distortion mb decision
370  uint8_t *obmc_scratchpad;
371  uint8_t *b_scratchpad; ///< scratchpad used for writing into write only buffers
372 
373  int qscale; ///< QP
374  int chroma_qscale; ///< chroma QP
375  unsigned int lambda; ///< lagrange multipler used in rate distortion
376  unsigned int lambda2; ///< (lambda*lambda) >> FF_LAMBDA_SHIFT
377  int *lambda_table;
378  int adaptive_quant; ///< use adaptive quantization
379  int dquant; ///< qscale difference to prev qscale
380  int closed_gop; ///< MPEG1/2 GOP is closed
381  int pict_type; ///< AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
382  int vbv_delay;
383  int last_pict_type; //FIXME removes
384  int last_non_b_pict_type; ///< used for mpeg4 gmc b-frames & ratecontrol
385  int droppable;
386  int frame_rate_index;
387  AVRational mpeg2_frame_rate_ext;
388  int last_lambda_for[5]; ///< last lambda for a specific pict type
389  int skipdct; ///< skip dct and code zero residual
390 
391  /* motion compensation */
392  int unrestricted_mv; ///< mv can point outside of the coded picture
393  int h263_long_vectors; ///< use horrible h263v1 long vector mode
394 
395  DSPContext dsp; ///< pointers for accelerated dsp functions
396  H264ChromaContext h264chroma;
397  HpelDSPContext hdsp;
398  VideoDSPContext vdsp;
399  int f_code; ///< forward MV resolution
400  int b_code; ///< backward MV resolution for B Frames (mpeg4)
401  int16_t (*p_mv_table_base)[2];
402  int16_t (*b_forw_mv_table_base)[2];
403  int16_t (*b_back_mv_table_base)[2];
404  int16_t (*b_bidir_forw_mv_table_base)[2];
405  int16_t (*b_bidir_back_mv_table_base)[2];
406  int16_t (*b_direct_mv_table_base)[2];
407  int16_t (*p_field_mv_table_base[2][2])[2];
408  int16_t (*b_field_mv_table_base[2][2][2])[2];
409  int16_t (*p_mv_table)[2]; ///< MV table (1MV per MB) p-frame encoding
410  int16_t (*b_forw_mv_table)[2]; ///< MV table (1MV per MB) forward mode b-frame encoding
411  int16_t (*b_back_mv_table)[2]; ///< MV table (1MV per MB) backward mode b-frame encoding
412  int16_t (*b_bidir_forw_mv_table)[2]; ///< MV table (1MV per MB) bidir mode b-frame encoding
413  int16_t (*b_bidir_back_mv_table)[2]; ///< MV table (1MV per MB) bidir mode b-frame encoding
414  int16_t (*b_direct_mv_table)[2]; ///< MV table (1MV per MB) direct mode b-frame encoding
415  int16_t (*p_field_mv_table[2][2])[2]; ///< MV table (2MV per MB) interlaced p-frame encoding
416  int16_t (*b_field_mv_table[2][2][2])[2];///< MV table (4MV per MB) interlaced b-frame encoding
417  uint8_t (*p_field_select_table[2]);
418  uint8_t (*b_field_select_table[2][2]);
419  int me_method; ///< ME algorithm
420  int mv_dir;
421 #define MV_DIR_FORWARD 1
422 #define MV_DIR_BACKWARD 2
423 #define MV_DIRECT 4 ///< bidirectional mode where the difference equals the MV of the last P/S/I-Frame (mpeg4)
424  int mv_type;
425 #define MV_TYPE_16X16 0 ///< 1 vector for the whole mb
426 #define MV_TYPE_8X8 1 ///< 4 vectors (h263, mpeg4 4MV)
427 #define MV_TYPE_16X8 2 ///< 2 vectors, one per 16x8 block
428 #define MV_TYPE_FIELD 3 ///< 2 vectors, one per field
429 #define MV_TYPE_DMV 4 ///< 2 vectors, special mpeg2 Dual Prime Vectors
430  /**motion vectors for a macroblock
431  first coordinate : 0 = forward 1 = backward
432  second " : depend on type
433  third " : 0 = x, 1 = y
434  */
435  int mv[2][4][2];
436  int field_select[2][2];
437  int last_mv[2][2][2]; ///< last MV, used for MV prediction in MPEG1 & B-frame MPEG4
438  uint8_t *fcode_tab; ///< smallest fcode needed for each MV
439  int16_t direct_scale_mv[2][64]; ///< precomputed to avoid divisions in ff_mpeg4_set_direct_mv
440 
441  MotionEstContext me;
442 
443  int no_rounding; /**< apply no rounding to motion compensation (MPEG4, msmpeg4, ...)
444  for b-frames rounding mode is always 0 */
445 
446  /* macroblock layer */
447  int mb_x, mb_y;
448  int mb_skip_run;
449  int mb_intra;
450  uint16_t *mb_type; ///< Table for candidate MB types for encoding
451 #define CANDIDATE_MB_TYPE_INTRA 0x01
452 #define CANDIDATE_MB_TYPE_INTER 0x02
453 #define CANDIDATE_MB_TYPE_INTER4V 0x04
454 #define CANDIDATE_MB_TYPE_SKIPPED 0x08
455 //#define MB_TYPE_GMC 0x10
456 
457 #define CANDIDATE_MB_TYPE_DIRECT 0x10
458 #define CANDIDATE_MB_TYPE_FORWARD 0x20
459 #define CANDIDATE_MB_TYPE_BACKWARD 0x40
460 #define CANDIDATE_MB_TYPE_BIDIR 0x80
461 
462 #define CANDIDATE_MB_TYPE_INTER_I 0x100
463 #define CANDIDATE_MB_TYPE_FORWARD_I 0x200
464 #define CANDIDATE_MB_TYPE_BACKWARD_I 0x400
465 #define CANDIDATE_MB_TYPE_BIDIR_I 0x800
466 
467 #define CANDIDATE_MB_TYPE_DIRECT0 0x1000
468 
469  int block_index[6]; ///< index to current MB in block based arrays with edges
470  int block_wrap[6];
471  uint8_t *dest[3];
472 
473  int *mb_index2xy; ///< mb_index -> mb_x + mb_y*mb_stride
474 
475  /** matrix transmitted in the bitstream */
476  uint16_t intra_matrix[64];
477  uint16_t chroma_intra_matrix[64];
478  uint16_t inter_matrix[64];
479  uint16_t chroma_inter_matrix[64];
480 #define QUANT_BIAS_SHIFT 8
481  int intra_quant_bias; ///< bias for the quantizer
482  int inter_quant_bias; ///< bias for the quantizer
483  int min_qcoeff; ///< minimum encodable coefficient
484  int max_qcoeff; ///< maximum encodable coefficient
485  int ac_esc_length; ///< num of bits needed to encode the longest esc
486  uint8_t *intra_ac_vlc_length;
487  uint8_t *intra_ac_vlc_last_length;
488  uint8_t *inter_ac_vlc_length;
489  uint8_t *inter_ac_vlc_last_length;
490  uint8_t *luma_dc_vlc_length;
491 #define UNI_AC_ENC_INDEX(run,level) ((run)*128 + (level))
492 
493  int coded_score[12];
494 
495  /** precomputed matrix (combine qscale and DCT renorm) */
496  int (*q_intra_matrix)[64];
497  int (*q_chroma_intra_matrix)[64];
498  int (*q_inter_matrix)[64];
499  /** identical to the above but for MMX & these are not permutated, second 64 entries are bias*/
500  uint16_t (*q_intra_matrix16)[2][64];
501  uint16_t (*q_chroma_intra_matrix16)[2][64];
502  uint16_t (*q_inter_matrix16)[2][64];
503 
504  /* noise reduction */
505  int (*dct_error_sum)[64];
506  int dct_count[2];
507  uint16_t (*dct_offset)[64];
508 
509  void *opaque; ///< private data for the user
510 
511  /* bit rate control */
512  int64_t total_bits;
513  int frame_bits; ///< bits used for the current frame
514  int stuffing_bits; ///< bits used for stuffing
515  int next_lambda; ///< next lambda used for retrying to encode a frame
516  RateControlContext rc_context; ///< contains stuff only accessed in ratecontrol.c
517 
518  /* statistics, used for 2-pass encoding */
519  int mv_bits;
520  int header_bits;
521  int i_tex_bits;
522  int p_tex_bits;
523  int i_count;
524  int f_count;
525  int b_count;
526  int skip_count;
527  int misc_bits; ///< cbp, mb_type
528  int last_bits; ///< temp var used for calculating the above vars
529 
530  /* error concealment / resync */
531  int resync_mb_x; ///< x position of last resync marker
532  int resync_mb_y; ///< y position of last resync marker
533  GetBitContext last_resync_gb; ///< used to search for the next resync marker
534  int mb_num_left; ///< number of MBs left in this video packet (for partitioned Slices only)
535  int next_p_frame_damaged; ///< set if the next p frame is damaged, to avoid showing trashed b frames
536  int err_recognition;
537 
538  ParseContext parse_context;
539 
540  /* H.263 specific */
541  int gob_index;
542  int obmc; ///< overlapped block motion compensation
543  int showed_packed_warning; ///< flag for having shown the warning about divxs invalid b frames
544  int mb_info; ///< interval for outputting info about mb offsets as side data
545  int prev_mb_info, last_mb_info;
546  uint8_t *mb_info_ptr;
547  int mb_info_size;
548  int ehc_mode;
549 
550  /* H.263+ specific */
551  int umvplus; ///< == H263+ && unrestricted_mv
552  int h263_aic_dir; ///< AIC direction: 0 = left, 1 = top
553  int h263_slice_structured;
554  int alt_inter_vlc; ///< alternative inter vlc
555  int modified_quant;
556  int loop_filter;
557  int custom_pcf;
558 
559  /* mpeg4 specific */
560  int time_increment_bits; ///< number of bits to represent the fractional part of time
561  int last_time_base;
562  int time_base; ///< time in seconds of last I,P,S Frame
563  int64_t time; ///< time of current frame
564  int64_t last_non_b_time;
565  uint16_t pp_time; ///< time distance between the last 2 p,s,i frames
566  uint16_t pb_time; ///< time distance between the last b and p,s,i frame
567  uint16_t pp_field_time;
568  uint16_t pb_field_time; ///< like above, just for interlaced
569  int shape;
570  int vol_sprite_usage;
571  int sprite_width;
572  int sprite_height;
573  int sprite_left;
574  int sprite_top;
575  int sprite_brightness_change;
576  int num_sprite_warping_points;
577  int real_sprite_warping_points;
578  uint16_t sprite_traj[4][2]; ///< sprite trajectory points
579  int sprite_offset[2][2]; ///< sprite offset[isChroma][isMVY]
580  int sprite_delta[2][2]; ///< sprite_delta [isY][isMVY]
581  int sprite_shift[2]; ///< sprite shift [isChroma]
582  int mcsel;
583  int quant_precision;
584  int quarter_sample; ///< 1->qpel, 0->half pel ME/MC
585  int scalability;
586  int hierachy_type;
587  int enhancement_type;
588  int new_pred;
589  int reduced_res_vop;
590  int aspect_ratio_info; //FIXME remove
591  int sprite_warping_accuracy;
592  int low_latency_sprite;
593  int data_partitioning; ///< data partitioning flag from header
594  int partitioned_frame; ///< is current frame partitioned
595  int rvlc; ///< reversible vlc
596  int resync_marker; ///< could this stream contain resync markers
597  int low_delay; ///< no reordering needed / has no b-frames
598  int vo_type;
599  int vol_control_parameters; ///< does the stream contain the low_delay flag, used to workaround buggy encoders
600  int intra_dc_threshold; ///< QP above whch the ac VLC should be used for intra dc
601  int use_intra_dc_vlc;
602  PutBitContext tex_pb; ///< used for data partitioned VOPs
603  PutBitContext pb2; ///< used for data partitioned VOPs
604  int mpeg_quant;
605  int t_frame; ///< time distance of first I -> B, used for interlaced b frames
606  int padding_bug_score; ///< used to detect the VERY common padding bug in MPEG4
607  int cplx_estimation_trash_i;
608  int cplx_estimation_trash_p;
609  int cplx_estimation_trash_b;
610 
611  /* divx specific, used to workaround (many) bugs in divx5 */
612  int divx_version;
613  int divx_build;
614  int divx_packed;
615  uint8_t *bitstream_buffer; //Divx 5.01 puts several frames in a single one, this is used to reorder them
616  int bitstream_buffer_size;
617  unsigned int allocated_bitstream_buffer_size;
618 
619  int xvid_build;
620 
621  /* lavc specific stuff, used to workaround bugs in libavcodec */
622  int lavc_build;
623 
624  /* RV10 specific */
625  int rv10_version; ///< RV10 version: 0 or 3
626  int rv10_first_dc_coded[3];
627  int orig_width, orig_height;
628 
629  /* MJPEG specific */
630  struct MJpegContext *mjpeg_ctx;
631  int mjpeg_vsample[3]; ///< vertical sampling factors, default = {2, 1, 1}
632  int mjpeg_hsample[3]; ///< horizontal sampling factors, default = {2, 1, 1}
633  int esc_pos;
634 
635  /* MSMPEG4 specific */
636  int mv_table_index;
637  int rl_table_index;
638  int rl_chroma_table_index;
639  int dc_table_index;
640  int use_skip_mb_code;
641  int slice_height; ///< in macroblocks
642  int first_slice_line; ///< used in mpeg4 too to handle resync markers
643  int flipflop_rounding;
644  int msmpeg4_version; ///< 0=not msmpeg4, 1=mp41, 2=mp42, 3=mp43/divx3 4=wmv1/7 5=wmv2/8
645  int per_mb_rl_table;
646  int esc3_level_length;
647  int esc3_run_length;
648  /** [mb_intra][isChroma][level][run][last] */
649  int (*ac_stats)[2][MAX_LEVEL+1][MAX_RUN+1][2];
650  int inter_intra_pred;
651  int mspel;
652 
653  /* decompression specific */
654  GetBitContext gb;
655 
656  /* Mpeg1 specific */
657  int gop_picture_number; ///< index of the first picture of a GOP based on fake_pic_num & mpeg1 specific
658  int last_mv_dir; ///< last mv_dir, used for b frame encoding
659  int broken_link; ///< no_output_of_prior_pics_flag
660  uint8_t *vbv_delay_ptr; ///< pointer to vbv_delay in the bitstream
661 
662  /* MPEG-2-specific - I wished not to have to support this mess. */
663  int progressive_sequence;
664  int mpeg_f_code[2][2];
665  int picture_structure;
666 /* picture type */
667 #define PICT_TOP_FIELD 1
668 #define PICT_BOTTOM_FIELD 2
669 #define PICT_FRAME 3
670 
671  int intra_dc_precision;
672  int frame_pred_frame_dct;
673  int top_field_first;
674  int concealment_motion_vectors;
675  int q_scale_type;
676  int intra_vlc_format;
677  int alternate_scan;
678  int repeat_first_field;
679  int chroma_420_type;
680  int chroma_format;
681 #define CHROMA_420 1
682 #define CHROMA_422 2
683 #define CHROMA_444 3
684  int chroma_x_shift;//depend on pix_format, that depend on chroma_format
685  int chroma_y_shift;
686 
687  int progressive_frame;
688  int full_pel[2];
689  int interlaced_dct;
690  int first_slice;
691  int first_field; ///< is 1 for the first field of a field picture 0 otherwise
692  int drop_frame_timecode; ///< timecode is in drop frame format.
693  int scan_offset; ///< reserve space for SVCD scan offset user data.
694 
695  /* RTP specific */
696  int rtp_mode;
697 
698  char *tc_opt_str; ///< timecode option string
699  AVTimecode tc; ///< timecode context
700 
701  uint8_t *ptr_lastgob;
702  int swap_uv; //vcr2 codec is an MPEG-2 variant with U and V swapped
703  int16_t (*pblocks[12])[64];
704 
705  int16_t (*block)[64]; ///< points to one of the following blocks
706  int16_t (*blocks)[12][64]; // for HQ mode we need to keep the best block
707  int (*decode_mb)(struct MpegEncContext *s, int16_t block[6][64]); // used by some codecs to avoid a switch()
708 #define SLICE_OK 0
709 #define SLICE_ERROR -1
710 #define SLICE_END -2 ///<end marker found
711 #define SLICE_NOEND -3 ///<no end marker or error found but mb count exceeded
712 
713  void (*dct_unquantize_mpeg1_intra)(struct MpegEncContext *s,
714  int16_t *block/*align 16*/, int n, int qscale);
715  void (*dct_unquantize_mpeg1_inter)(struct MpegEncContext *s,
716  int16_t *block/*align 16*/, int n, int qscale);
717  void (*dct_unquantize_mpeg2_intra)(struct MpegEncContext *s,
718  int16_t *block/*align 16*/, int n, int qscale);
719  void (*dct_unquantize_mpeg2_inter)(struct MpegEncContext *s,
720  int16_t *block/*align 16*/, int n, int qscale);
721  void (*dct_unquantize_h263_intra)(struct MpegEncContext *s,
722  int16_t *block/*align 16*/, int n, int qscale);
723  void (*dct_unquantize_h263_inter)(struct MpegEncContext *s,
724  int16_t *block/*align 16*/, int n, int qscale);
725  void (*dct_unquantize_h261_intra)(struct MpegEncContext *s,
726  int16_t *block/*align 16*/, int n, int qscale);
727  void (*dct_unquantize_h261_inter)(struct MpegEncContext *s,
728  int16_t *block/*align 16*/, int n, int qscale);
729  void (*dct_unquantize_intra)(struct MpegEncContext *s, // unquantizer to use (mpeg4 can use both)
730  int16_t *block/*align 16*/, int n, int qscale);
731  void (*dct_unquantize_inter)(struct MpegEncContext *s, // unquantizer to use (mpeg4 can use both)
732  int16_t *block/*align 16*/, int n, int qscale);
733  int (*dct_quantize)(struct MpegEncContext *s, int16_t *block/*align 16*/, int n, int qscale, int *overflow);
734  int (*fast_dct_quantize)(struct MpegEncContext *s, int16_t *block/*align 16*/, int n, int qscale, int *overflow);
735  void (*denoise_dct)(struct MpegEncContext *s, int16_t *block);
736 
737  int mpv_flags; ///< flags set by private options
738  int quantizer_noise_shaping;
739 
740  /* temp buffers for rate control */
741  float *cplx_tab, *bits_tab;
742 
743  /* flag to indicate a reinitialization is required, e.g. after
744  * a frame size change */
745  int context_reinit;
746 
747  ERContext er;
748 
749  /* temporary frames used by b_frame_strategy = 2 */
750  AVFrame *tmp_frames[FF_MAX_B_FRAMES + 2];
751 } MpegEncContext;
752 
753 #define REBASE_PICTURE(pic, new_ctx, old_ctx) \
754  ((pic && pic >= old_ctx->picture && \
755  pic < old_ctx->picture + MAX_PICTURE_COUNT) ? \
756  &new_ctx->picture[pic - old_ctx->picture] : NULL)
757 
758 /* mpegvideo_enc common options */
759 #define FF_MPV_FLAG_SKIP_RD 0x0001
760 #define FF_MPV_FLAG_STRICT_GOP 0x0002
761 #define FF_MPV_FLAG_QP_RD 0x0004
762 #define FF_MPV_FLAG_CBP_RD 0x0008
763 
764 #define FF_MPV_OFFSET(x) offsetof(MpegEncContext, x)
765 #define FF_MPV_OPT_FLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
766 #define FF_MPV_COMMON_OPTS \
767 { "mpv_flags", "Flags common for all mpegvideo-based encoders.", FF_MPV_OFFSET(mpv_flags), AV_OPT_TYPE_FLAGS, { .i64 = 0 }, INT_MIN, INT_MAX, FF_MPV_OPT_FLAGS, "mpv_flags" },\
768 { "skip_rd", "RD optimal MB level residual skipping", 0, AV_OPT_TYPE_CONST, { .i64 = FF_MPV_FLAG_SKIP_RD }, 0, 0, FF_MPV_OPT_FLAGS, "mpv_flags" },\
769 { "strict_gop", "Strictly enforce gop size", 0, AV_OPT_TYPE_CONST, { .i64 = FF_MPV_FLAG_STRICT_GOP }, 0, 0, FF_MPV_OPT_FLAGS, "mpv_flags" },\
770 { "qp_rd", "Use rate distortion optimization for qp selection", 0, AV_OPT_TYPE_CONST, { .i64 = FF_MPV_FLAG_QP_RD }, 0, 0, FF_MPV_OPT_FLAGS, "mpv_flags" },\
771 { "cbp_rd", "use rate distortion optimization for CBP", 0, AV_OPT_TYPE_CONST, { .i64 = FF_MPV_FLAG_CBP_RD }, 0, 0, FF_MPV_OPT_FLAGS, "mpv_flags" },\
772 { "luma_elim_threshold", "single coefficient elimination threshold for luminance (negative values also consider dc coefficient)",\
773  FF_MPV_OFFSET(luma_elim_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FF_MPV_OPT_FLAGS },\
774 { "chroma_elim_threshold", "single coefficient elimination threshold for chrominance (negative values also consider dc coefficient)",\
775  FF_MPV_OFFSET(chroma_elim_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FF_MPV_OPT_FLAGS },\
776 { "quantizer_noise_shaping", NULL, FF_MPV_OFFSET(quantizer_noise_shaping), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FF_MPV_OPT_FLAGS },
777 
778 extern const AVOption ff_mpv_generic_options[];
779 
780 #define FF_MPV_GENERIC_CLASS(name) \
781 static const AVClass name ## _class = {\
782  .class_name = #name " encoder",\
783  .item_name = av_default_item_name,\
784  .option = ff_mpv_generic_options,\
785  .version = LIBAVUTIL_VERSION_INT,\
786 };
787 
788 /**
789  * Set the given MpegEncContext to common defaults (same for encoding
790  * and decoding). The changed fields will not depend upon the prior
791  * state of the MpegEncContext.
792  */
793 void ff_MPV_common_defaults(MpegEncContext *s);
794 
795 void ff_MPV_decode_defaults(MpegEncContext *s);
796 int ff_MPV_common_init(MpegEncContext *s);
797 int ff_mpv_frame_size_alloc(MpegEncContext *s, int linesize);
798 int ff_MPV_common_frame_size_change(MpegEncContext *s);
799 void ff_MPV_common_end(MpegEncContext *s);
800 void ff_MPV_decode_mb(MpegEncContext *s, int16_t block[12][64]);
801 int ff_MPV_frame_start(MpegEncContext *s, AVCodecContext *avctx);
802 void ff_MPV_frame_end(MpegEncContext *s);
803 int ff_MPV_encode_init(AVCodecContext *avctx);
804 int ff_MPV_encode_end(AVCodecContext *avctx);
805 int ff_MPV_encode_picture(AVCodecContext *avctx, AVPacket *pkt,
806  AVFrame *frame, int *got_packet);
807 void ff_dct_encode_init_x86(MpegEncContext *s);
808 void ff_MPV_common_init_x86(MpegEncContext *s);
809 void ff_MPV_common_init_axp(MpegEncContext *s);
810 void ff_MPV_common_init_arm(MpegEncContext *s);
811 void ff_MPV_common_init_bfin(MpegEncContext *s);
812 void ff_MPV_common_init_ppc(MpegEncContext *s);
813 void ff_clean_intra_table_entries(MpegEncContext *s);
814 void ff_draw_horiz_band(AVCodecContext *avctx, DSPContext *dsp, Picture *cur,
815  Picture *last, int y, int h, int picture_structure,
816  int first_field, int draw_edges, int low_delay,
817  int v_edge_pos, int h_edge_pos);
818 void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h);
819 void ff_mpeg_flush(AVCodecContext *avctx);
820 
821 void ff_print_debug_info(MpegEncContext *s, Picture *p, AVFrame *pict);
822 void ff_print_debug_info2(AVCodecContext *avctx, Picture *p, AVFrame *pict, uint8_t *mbskip_table,
823  int *low_delay,
824  int mb_width, int mb_height, int mb_stride, int quarter_sample);
825 
826 int ff_mpv_export_qp_table(MpegEncContext *s, AVFrame *f, Picture *p, int qp_type);
827 
828 void ff_write_quant_matrix(PutBitContext *pb, uint16_t *matrix);
829 void ff_release_unused_pictures(MpegEncContext *s, int remove_current);
830 int ff_find_unused_picture(MpegEncContext *s, int shared);
831 void ff_denoise_dct(MpegEncContext *s, int16_t *block);
832 int ff_update_duplicate_context(MpegEncContext *dst, MpegEncContext *src);
833 int ff_MPV_lowest_referenced_row(MpegEncContext *s, int dir);
834 void ff_MPV_report_decode_progress(MpegEncContext *s);
835 int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src);
836 void ff_set_qscale(MpegEncContext * s, int qscale);
837 
838 void ff_mpeg_er_frame_start(MpegEncContext *s);
839 
840 int ff_dct_common_init(MpegEncContext *s);
841 int ff_dct_encode_init(MpegEncContext *s);
842 void ff_convert_matrix(DSPContext *dsp, int (*qmat)[64], uint16_t (*qmat16)[2][64],
843  const uint16_t *quant_matrix, int bias, int qmin, int qmax, int intra);
844 int ff_dct_quantize_c(MpegEncContext *s, int16_t *block, int n, int qscale, int *overflow);
845 
846 void ff_init_block_index(MpegEncContext *s);
847 
848 void ff_MPV_motion(MpegEncContext *s,
849  uint8_t *dest_y, uint8_t *dest_cb,
850  uint8_t *dest_cr, int dir,
851  uint8_t **ref_picture,
852  op_pixels_func (*pix_op)[4],
853  qpel_mc_func (*qpix_op)[16]);
854 
855 /**
856  * Allocate a Picture.
857  * The pixels are allocated/set by calling get_buffer() if shared = 0.
858  */
859 int ff_alloc_picture(MpegEncContext *s, Picture *pic, int shared);
860 
861 extern const enum AVPixelFormat ff_pixfmt_list_420[];
862 
863 /**
864  * permute block according to permuatation.
865  * @param last last non zero element in scantable order
866  */
867 void ff_block_permute(int16_t *block, uint8_t *permutation, const uint8_t *scantable, int last);
868 
869 static inline void ff_update_block_index(MpegEncContext *s){
870  const int block_size= 8 >> s->avctx->lowres;
871 
872  s->block_index[0]+=2;
873  s->block_index[1]+=2;
874  s->block_index[2]+=2;
875  s->block_index[3]+=2;
876  s->block_index[4]++;
877  s->block_index[5]++;
878  s->dest[0]+= 2*block_size;
879  s->dest[1]+= block_size;
880  s->dest[2]+= block_size;
881 }
882 
883 static inline int get_bits_diff(MpegEncContext *s){
884  const int bits= put_bits_count(&s->pb);
885  const int last= s->last_bits;
886 
887  s->last_bits = bits;
888 
889  return bits - last;
890 }
891 
892 static inline int ff_h263_round_chroma(int x){
893  static const uint8_t h263_chroma_roundtab[16] = {
894  // 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
895  0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
896  };
897  return h263_chroma_roundtab[x & 0xf] + (x >> 3);
898 }
899 
900 /* motion_est.c */
901 void ff_estimate_p_frame_motion(MpegEncContext * s,
902  int mb_x, int mb_y);
903 void ff_estimate_b_frame_motion(MpegEncContext * s,
904  int mb_x, int mb_y);
905 int ff_get_best_fcode(MpegEncContext * s, int16_t (*mv_table)[2], int type);
906 void ff_fix_long_p_mvs(MpegEncContext * s);
907 void ff_fix_long_mvs(MpegEncContext * s, uint8_t *field_select_table, int field_select,
908  int16_t (*mv_table)[2], int f_code, int type, int truncate);
909 int ff_init_me(MpegEncContext *s);
910 int ff_pre_estimate_p_frame_motion(MpegEncContext * s, int mb_x, int mb_y);
911 int ff_epzs_motion_search(MpegEncContext * s, int *mx_ptr, int *my_ptr,
912  int P[10][2], int src_index, int ref_index, int16_t (*last_mv)[2],
913  int ref_mv_scale, int size, int h);
914 int ff_get_mb_score(MpegEncContext * s, int mx, int my, int src_index,
915  int ref_index, int size, int h, int add_rate);
916 
917 /* mpeg12.c */
918 extern const uint8_t ff_mpeg1_dc_scale_table[128];
919 extern const uint8_t * const ff_mpeg2_dc_scale_table[4];
920 
921 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number);
922 void ff_mpeg1_encode_mb(MpegEncContext *s,
923  int16_t block[6][64],
924  int motion_x, int motion_y);
925 void ff_mpeg1_encode_init(MpegEncContext *s);
926 void ff_mpeg1_encode_slice_header(MpegEncContext *s);
927 
928 extern const uint8_t ff_aic_dc_scale_table[32];
929 extern const uint8_t ff_h263_chroma_qscale_table[32];
930 extern const uint8_t ff_h263_loop_filter_strength[32];
931 
932 /* rv10.c */
933 void ff_rv10_encode_picture_header(MpegEncContext *s, int picture_number);
934 int ff_rv_decode_dc(MpegEncContext *s, int n);
935 void ff_rv20_encode_picture_header(MpegEncContext *s, int picture_number);
936 
937 
938 /* msmpeg4.c */
939 void ff_msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number);
940 void ff_msmpeg4_encode_ext_header(MpegEncContext * s);
941 void ff_msmpeg4_encode_mb(MpegEncContext * s,
942  int16_t block[6][64],
943  int motion_x, int motion_y);
944 int ff_msmpeg4_decode_picture_header(MpegEncContext * s);
945 int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size);
946 int ff_msmpeg4_decode_init(AVCodecContext *avctx);
947 void ff_msmpeg4_encode_init(MpegEncContext *s);
948 int ff_wmv2_decode_picture_header(MpegEncContext * s);
949 int ff_wmv2_decode_secondary_picture_header(MpegEncContext * s);
950 void ff_wmv2_add_mb(MpegEncContext *s, int16_t block[6][64], uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr);
951 void ff_mspel_motion(MpegEncContext *s,
952  uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
953  uint8_t **ref_picture, op_pixels_func (*pix_op)[4],
954  int motion_x, int motion_y, int h);
955 int ff_wmv2_encode_picture_header(MpegEncContext * s, int picture_number);
956 void ff_wmv2_encode_mb(MpegEncContext * s,
957  int16_t block[6][64],
958  int motion_x, int motion_y);
959 
960 int ff_mpeg_ref_picture(MpegEncContext *s, Picture *dst, Picture *src);
961 void ff_mpeg_unref_picture(MpegEncContext *s, Picture *picture);
962 
963 
964 #endif /* AVCODEC_MPEGVIDEO_H */
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