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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 "h263dsp.h"
37 #include "hpeldsp.h"
38 #include "put_bits.h"
39 #include "ratecontrol.h"
40 #include "parser.h"
41 #include "mpeg12data.h"
42 #include "rl.h"
43 #include "thread.h"
44 #include "videodsp.h"
45 
46 #include "libavutil/opt.h"
47 #include "libavutil/timecode.h"
48 
49 #define FRAME_SKIPPED 100 ///< return value for header parsers if frame is not coded
50 
56 };
57 
58 #define MPEG_BUF_SIZE (16 * 1024)
59 
60 #define QMAT_SHIFT_MMX 16
61 #define QMAT_SHIFT 21
62 
63 #define MAX_FCODE 7
64 #define MAX_MV 4096
65 
66 #define MAX_THREADS 32
67 #define MAX_PICTURE_COUNT 36
68 
69 #define MAX_B_FRAMES 16
70 
71 #define ME_MAP_SIZE 64
72 #define ME_MAP_SHIFT 3
73 #define ME_MAP_MV_BITS 11
74 
75 #define MAX_MB_BYTES (30*16*16*3/8 + 120)
76 
77 #define INPLACE_OFFSET 16
78 
79 /* Start codes. */
80 #define SEQ_END_CODE 0x000001b7
81 #define SEQ_START_CODE 0x000001b3
82 #define GOP_START_CODE 0x000001b8
83 #define PICTURE_START_CODE 0x00000100
84 #define SLICE_MIN_START_CODE 0x00000101
85 #define SLICE_MAX_START_CODE 0x000001af
86 #define EXT_START_CODE 0x000001b5
87 #define USER_START_CODE 0x000001b2
88 
89 /**
90  * Value of Picture.reference when Picture is not a reference picture, but
91  * is held for delayed output.
92  */
93 #define DELAYED_PIC_REF 4
94 
95 struct MpegEncContext;
96 
97 /**
98  * Picture.
99  */
100 typedef struct Picture{
101  struct AVFrame f;
102  uint8_t avframe_padding[1024]; // hack to allow linking to a avutil with larger AVFrame
104 
106  int8_t *qscale_table;
107 
109  int16_t (*motion_val[2])[2];
110 
112  uint32_t *mb_type;
113 
114 #if !FF_API_MB_TYPE
115 #define MB_TYPE_INTRA4x4 0x0001
116 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
117 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
118 #define MB_TYPE_16x16 0x0008
119 #define MB_TYPE_16x8 0x0010
120 #define MB_TYPE_8x16 0x0020
121 #define MB_TYPE_8x8 0x0040
122 #define MB_TYPE_INTERLACED 0x0080
123 #define MB_TYPE_DIRECT2 0x0100 //FIXME
124 #define MB_TYPE_ACPRED 0x0200
125 #define MB_TYPE_GMC 0x0400
126 #define MB_TYPE_SKIP 0x0800
127 #define MB_TYPE_P0L0 0x1000
128 #define MB_TYPE_P1L0 0x2000
129 #define MB_TYPE_P0L1 0x4000
130 #define MB_TYPE_P1L1 0x8000
131 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
132 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
133 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
134 #define MB_TYPE_QUANT 0x00010000
135 #define MB_TYPE_CBP 0x00020000
136 #endif
137 
140 
142  int8_t *ref_index[2];
143 
145  uint16_t *mb_var; ///< Table for MB variances
146 
148  uint16_t *mc_mb_var; ///< Table for motion compensated MB variances
149 
150  int alloc_mb_width; ///< mb_width used to allocate tables
151  int alloc_mb_height; ///< mb_height used to allocate tables
152 
154  uint8_t *mb_mean; ///< Table for MB luminance
155 
157  /**
158  * hardware accelerator private data
159  */
161 
162 #define MB_TYPE_INTRA MB_TYPE_INTRA4x4 //default mb_type if there is just one type
163 #define IS_INTRA4x4(a) ((a)&MB_TYPE_INTRA4x4)
164 #define IS_INTRA16x16(a) ((a)&MB_TYPE_INTRA16x16)
165 #define IS_PCM(a) ((a)&MB_TYPE_INTRA_PCM)
166 #define IS_INTRA(a) ((a)&7)
167 #define IS_INTER(a) ((a)&(MB_TYPE_16x16|MB_TYPE_16x8|MB_TYPE_8x16|MB_TYPE_8x8))
168 #define IS_SKIP(a) ((a)&MB_TYPE_SKIP)
169 #define IS_INTRA_PCM(a) ((a)&MB_TYPE_INTRA_PCM)
170 #define IS_INTERLACED(a) ((a)&MB_TYPE_INTERLACED)
171 #define IS_DIRECT(a) ((a)&MB_TYPE_DIRECT2)
172 #define IS_GMC(a) ((a)&MB_TYPE_GMC)
173 #define IS_16X16(a) ((a)&MB_TYPE_16x16)
174 #define IS_16X8(a) ((a)&MB_TYPE_16x8)
175 #define IS_8X16(a) ((a)&MB_TYPE_8x16)
176 #define IS_8X8(a) ((a)&MB_TYPE_8x8)
177 #define IS_SUB_8X8(a) ((a)&MB_TYPE_16x16) //note reused
178 #define IS_SUB_8X4(a) ((a)&MB_TYPE_16x8) //note reused
179 #define IS_SUB_4X8(a) ((a)&MB_TYPE_8x16) //note reused
180 #define IS_SUB_4X4(a) ((a)&MB_TYPE_8x8) //note reused
181 #define IS_ACPRED(a) ((a)&MB_TYPE_ACPRED)
182 #define IS_QUANT(a) ((a)&MB_TYPE_QUANT)
183 #define IS_DIR(a, part, list) ((a) & (MB_TYPE_P0L0<<((part)+2*(list))))
184 #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
185 #define HAS_CBP(a) ((a)&MB_TYPE_CBP)
186 
187  int field_poc[2]; ///< h264 top/bottom POC
188  int poc; ///< h264 frame POC
189  int frame_num; ///< h264 frame_num (raw frame_num from slice header)
190  int mmco_reset; ///< h264 MMCO_RESET set this 1. Reordering code must not mix pictures before and after MMCO_RESET.
191  int pic_id; /**< h264 pic_num (short -> no wrap version of pic_num,
192  pic_num & max_pic_num; long -> long_pic_num) */
193  int long_ref; ///< 1->long term reference 0->short term reference
194  int ref_poc[2][2][32]; ///< h264 POCs of the frames/fields used as reference (FIXME need per slice)
195  int ref_count[2][2]; ///< number of entries in ref_poc (FIXME need per slice)
196  int mbaff; ///< h264 1 -> MBAFF frame 0-> not MBAFF
197  int field_picture; ///< whether or not the picture was encoded in separate fields
198 
199  int64_t mb_var_sum; ///< sum of MB variance for current frame
200  int64_t mc_mb_var_sum; ///< motion compensated MB variance for current frame
201 
203  int needs_realloc; ///< Picture needs to be reallocated (eg due to a frame size change)
204 
206  int shared;
207  int recovered; ///< Picture at IDR or recovery point + recovery count
209 
210  int crop;
212  int crop_top;
213 } Picture;
214 
215 /**
216  * Motion estimation context.
217  */
218 typedef struct MotionEstContext{
220  int skip; ///< set if ME is skipped for the current MB
221  int co_located_mv[4][2]; ///< mv from last P-frame for direct mode ME
222  int direct_basis_mv[4][2];
223  uint8_t *scratchpad; ///< data area for the ME algo, so that the ME does not need to malloc/free
228  uint32_t *map; ///< map to avoid duplicate evaluations
229  uint32_t *score_map; ///< map to store the scores
230  unsigned map_generation;
232  int penalty_factor; /**< an estimate of the bits required to
233  code a given mv value, e.g. (1,0) takes
234  more bits than (0,0). We have to
235  estimate whether any reduction in
236  residual is worth the extra bits. */
239  int flags;
241  int mb_flags;
242  int pre_pass; ///< = 1 for the pre pass
243  int dia_size;
244  int xmin;
245  int xmax;
246  int ymin;
247  int ymax;
248  int pred_x;
249  int pred_y;
250  uint8_t *src[4][4];
251  uint8_t *ref[4][4];
252  int stride;
253  int uvstride;
254  /* temp variables for picture complexity calculation */
258 /* cmp, chroma_cmp;*/
263  uint8_t (*mv_penalty)[MAX_MV*2+1]; ///< amount of bits needed to encode a MV
266  int *mx_ptr, int *my_ptr, int dmin,
267  int src_index, int ref_index,
268  int size, int h);
270 
271 /**
272  * MpegEncContext.
273  */
274 typedef struct MpegEncContext {
275  AVClass *class;
277  /* the following parameters must be initialized before encoding */
278  int width, height;///< picture size. must be a multiple of 16
279  int gop_size;
280  int intra_only; ///< if true, only intra pictures are generated
281  int bit_rate; ///< wanted bit rate
282  enum OutputFormat out_format; ///< output format
283  int h263_pred; ///< use mpeg4/h263 ac/dc predictions
284  int pb_frame; ///< PB frame mode (0 = none, 1 = base, 2 = improved)
285 
286 /* the following codec id fields are deprecated in favor of codec_id */
287  int h263_plus; ///< h263 plus headers
288  int h263_flv; ///< use flv h263 header
289 
290  enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
291  int fixed_qscale; ///< fixed qscale if non zero
292  int encoding; ///< true if we are encoding (vs decoding)
293  int flags; ///< AVCodecContext.flags (HQ, MV4, ...)
294  int flags2; ///< AVCodecContext.flags2
295  int max_b_frames; ///< max number of b-frames for encoding
298  int strict_std_compliance; ///< strictly follow the std (MPEG4, ...)
299  int workaround_bugs; ///< workaround bugs in encoders which cannot be detected automatically
300  int codec_tag; ///< internal codec_tag upper case converted from avctx codec_tag
301  int stream_codec_tag; ///< internal stream_codec_tag upper case converted from avctx stream_codec_tag
302  /* the following fields are managed internally by the encoder */
303 
304  /* sequence parameters */
306  int input_picture_number; ///< used to set pic->display_picture_number, should not be used for/by anything else
307  int coded_picture_number; ///< used to set pic->coded_picture_number, should not be used for/by anything else
308  int picture_number; //FIXME remove, unclear definition
309  int picture_in_gop_number; ///< 0-> first pic in gop, ...
310  int mb_width, mb_height; ///< number of MBs horizontally & vertically
311  int mb_stride; ///< mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11
312  int b8_stride; ///< 2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
313  int b4_stride; ///< 4*mb_width+1 used for some 4x4 block arrays to allow simple addressing
314  int h_edge_pos, v_edge_pos;///< horizontal / vertical position of the right/bottom edge (pixel replication)
315  int mb_num; ///< number of MBs of a picture
316  ptrdiff_t linesize; ///< line size, in bytes, may be different from width
317  ptrdiff_t uvlinesize; ///< line size, for chroma in bytes, may be different from width
318  Picture *picture; ///< main picture buffer
319  Picture **input_picture; ///< next pictures on display order for encoding
320  Picture **reordered_input_picture; ///< pointer to the next pictures in codedorder for encoding
321 
323  int ac_pred;
324  int block_last_index[12]; ///< last non zero coefficient in block
325  int h263_aic; ///< Advanded INTRA Coding (AIC)
326 
327  /* scantables */
328  ScanTable inter_scantable; ///< if inter == intra then intra should be used to reduce tha cache usage
332 
333  /* WARNING: changes above this line require updates to hardcoded
334  * offsets used in asm. */
335 
336  int64_t user_specified_pts; ///< last non-zero pts from AVFrame which was passed into avcodec_encode_video2()
337  /**
338  * pts difference between the first and second input frame, used for
339  * calculating dts of the first frame when there's a delay */
340  int64_t dts_delta;
341  /**
342  * reordered pts to be used as dts for the next output frame when there's
343  * a delay */
344  int64_t reordered_pts;
345 
346  /** bit output */
348 
349  int start_mb_y; ///< start mb_y of this thread (so current thread should process start_mb_y <= row < end_mb_y)
350  int end_mb_y; ///< end mb_y of this thread (so current thread should process start_mb_y <= row < end_mb_y)
352  int slice_context_count; ///< number of used thread_contexts
353 
354  /**
355  * copy of the previous picture structure.
356  * note, linesize & data, might not match the previous picture (for field pictures)
357  */
359 
360  /**
361  * copy of the next picture structure.
362  * note, linesize & data, might not match the next picture (for field pictures)
363  */
365 
366  /**
367  * copy of the source picture structure for encoding.
368  * note, linesize & data, might not match the source picture (for field pictures)
369  */
371 
372  /**
373  * copy of the current picture structure.
374  * note, linesize & data, might not match the current picture (for field pictures)
375  */
376  Picture current_picture; ///< buffer to store the decompressed current picture
377 
378  Picture *last_picture_ptr; ///< pointer to the previous picture.
379  Picture *next_picture_ptr; ///< pointer to the next picture (for bidir pred)
380  Picture *current_picture_ptr; ///< pointer to the current picture
381  int last_dc[3]; ///< last DC values for MPEG1
382  int16_t *dc_val_base;
383  int16_t *dc_val[3]; ///< used for mpeg4 DC prediction, all 3 arrays must be continuous
384  const uint8_t *y_dc_scale_table; ///< qscale -> y_dc_scale table
385  const uint8_t *c_dc_scale_table; ///< qscale -> c_dc_scale table
386  const uint8_t *chroma_qscale_table; ///< qscale -> chroma_qscale (h263)
388  uint8_t *coded_block; ///< used for coded block pattern prediction (msmpeg4v3, wmv1)
389  int16_t (*ac_val_base)[16];
390  int16_t (*ac_val[3])[16]; ///< used for mpeg4 AC prediction, all 3 arrays must be continuous
391  int mb_skipped; ///< MUST BE SET only during DECODING
392  uint8_t *mbskip_table; /**< used to avoid copy if macroblock skipped (for black regions for example)
393  and used for b-frame encoding & decoding (contains skip table of next P Frame) */
394  uint8_t *mbintra_table; ///< used to avoid setting {ac, dc, cbp}-pred stuff to zero on inter MB decoding
395  uint8_t *cbp_table; ///< used to store cbp, ac_pred for partitioned decoding
396  uint8_t *pred_dir_table; ///< used to store pred_dir for partitioned decoding
397  uint8_t *edge_emu_buffer; ///< temporary buffer for if MVs point to out-of-frame data
398  uint8_t *rd_scratchpad; ///< scratchpad for rate distortion mb decision
400  uint8_t *b_scratchpad; ///< scratchpad used for writing into write only buffers
401 
402  int qscale; ///< QP
403  int chroma_qscale; ///< chroma QP
404  unsigned int lambda; ///< lagrange multipler used in rate distortion
405  unsigned int lambda2; ///< (lambda*lambda) >> FF_LAMBDA_SHIFT
407  int adaptive_quant; ///< use adaptive quantization
408  int dquant; ///< qscale difference to prev qscale
409  int closed_gop; ///< MPEG1/2 GOP is closed
410  int pict_type; ///< AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
412  int last_pict_type; //FIXME removes
413  int last_non_b_pict_type; ///< used for mpeg4 gmc b-frames & ratecontrol
417  int last_lambda_for[5]; ///< last lambda for a specific pict type
418  int skipdct; ///< skip dct and code zero residual
419 
420  /* motion compensation */
421  int unrestricted_mv; ///< mv can point outside of the coded picture
422  int h263_long_vectors; ///< use horrible h263v1 long vector mode
423 
424  DSPContext dsp; ///< pointers for accelerated dsp functions
429  int f_code; ///< forward MV resolution
430  int b_code; ///< backward MV resolution for B Frames (mpeg4)
431  int16_t (*p_mv_table_base)[2];
432  int16_t (*b_forw_mv_table_base)[2];
433  int16_t (*b_back_mv_table_base)[2];
436  int16_t (*b_direct_mv_table_base)[2];
437  int16_t (*p_field_mv_table_base[2][2])[2];
438  int16_t (*b_field_mv_table_base[2][2][2])[2];
439  int16_t (*p_mv_table)[2]; ///< MV table (1MV per MB) p-frame encoding
440  int16_t (*b_forw_mv_table)[2]; ///< MV table (1MV per MB) forward mode b-frame encoding
441  int16_t (*b_back_mv_table)[2]; ///< MV table (1MV per MB) backward mode b-frame encoding
442  int16_t (*b_bidir_forw_mv_table)[2]; ///< MV table (1MV per MB) bidir mode b-frame encoding
443  int16_t (*b_bidir_back_mv_table)[2]; ///< MV table (1MV per MB) bidir mode b-frame encoding
444  int16_t (*b_direct_mv_table)[2]; ///< MV table (1MV per MB) direct mode b-frame encoding
445  int16_t (*p_field_mv_table[2][2])[2]; ///< MV table (2MV per MB) interlaced p-frame encoding
446  int16_t (*b_field_mv_table[2][2][2])[2];///< MV table (4MV per MB) interlaced b-frame encoding
449  int me_method; ///< ME algorithm
450  int mv_dir;
451 #define MV_DIR_FORWARD 1
452 #define MV_DIR_BACKWARD 2
453 #define MV_DIRECT 4 ///< bidirectional mode where the difference equals the MV of the last P/S/I-Frame (mpeg4)
454  int mv_type;
455 #define MV_TYPE_16X16 0 ///< 1 vector for the whole mb
456 #define MV_TYPE_8X8 1 ///< 4 vectors (h263, mpeg4 4MV)
457 #define MV_TYPE_16X8 2 ///< 2 vectors, one per 16x8 block
458 #define MV_TYPE_FIELD 3 ///< 2 vectors, one per field
459 #define MV_TYPE_DMV 4 ///< 2 vectors, special mpeg2 Dual Prime Vectors
460  /**motion vectors for a macroblock
461  first coordinate : 0 = forward 1 = backward
462  second " : depend on type
463  third " : 0 = x, 1 = y
464  */
465  int mv[2][4][2];
466  int field_select[2][2];
467  int last_mv[2][2][2]; ///< last MV, used for MV prediction in MPEG1 & B-frame MPEG4
468  uint8_t *fcode_tab; ///< smallest fcode needed for each MV
469  int16_t direct_scale_mv[2][64]; ///< precomputed to avoid divisions in ff_mpeg4_set_direct_mv
470 
472 
473  int no_rounding; /**< apply no rounding to motion compensation (MPEG4, msmpeg4, ...)
474  for b-frames rounding mode is always 0 */
475 
476  /* macroblock layer */
477  int mb_x, mb_y;
479  int mb_intra;
480  uint16_t *mb_type; ///< Table for candidate MB types for encoding
481 #define CANDIDATE_MB_TYPE_INTRA 0x01
482 #define CANDIDATE_MB_TYPE_INTER 0x02
483 #define CANDIDATE_MB_TYPE_INTER4V 0x04
484 #define CANDIDATE_MB_TYPE_SKIPPED 0x08
485 //#define MB_TYPE_GMC 0x10
486 
487 #define CANDIDATE_MB_TYPE_DIRECT 0x10
488 #define CANDIDATE_MB_TYPE_FORWARD 0x20
489 #define CANDIDATE_MB_TYPE_BACKWARD 0x40
490 #define CANDIDATE_MB_TYPE_BIDIR 0x80
491 
492 #define CANDIDATE_MB_TYPE_INTER_I 0x100
493 #define CANDIDATE_MB_TYPE_FORWARD_I 0x200
494 #define CANDIDATE_MB_TYPE_BACKWARD_I 0x400
495 #define CANDIDATE_MB_TYPE_BIDIR_I 0x800
496 
497 #define CANDIDATE_MB_TYPE_DIRECT0 0x1000
498 
499  int block_index[6]; ///< index to current MB in block based arrays with edges
500  int block_wrap[6];
502 
503  int *mb_index2xy; ///< mb_index -> mb_x + mb_y*mb_stride
504 
505  /** matrix transmitted in the bitstream */
506  uint16_t intra_matrix[64];
507  uint16_t chroma_intra_matrix[64];
508  uint16_t inter_matrix[64];
509  uint16_t chroma_inter_matrix[64];
510 #define QUANT_BIAS_SHIFT 8
511  int intra_quant_bias; ///< bias for the quantizer
512  int inter_quant_bias; ///< bias for the quantizer
513  int min_qcoeff; ///< minimum encodable coefficient
514  int max_qcoeff; ///< maximum encodable coefficient
515  int ac_esc_length; ///< num of bits needed to encode the longest esc
521 #define UNI_AC_ENC_INDEX(run,level) ((run)*128 + (level))
522 
523  int coded_score[12];
524 
525  /** precomputed matrix (combine qscale and DCT renorm) */
526  int (*q_intra_matrix)[64];
528  int (*q_inter_matrix)[64];
529  /** identical to the above but for MMX & these are not permutated, second 64 entries are bias*/
530  uint16_t (*q_intra_matrix16)[2][64];
531  uint16_t (*q_chroma_intra_matrix16)[2][64];
532  uint16_t (*q_inter_matrix16)[2][64];
533 
534  /* noise reduction */
535  int (*dct_error_sum)[64];
536  int dct_count[2];
537  uint16_t (*dct_offset)[64];
538 
539  void *opaque; ///< private data for the user
540 
541  /* bit rate control */
542  int64_t total_bits;
543  int frame_bits; ///< bits used for the current frame
544  int stuffing_bits; ///< bits used for stuffing
545  int next_lambda; ///< next lambda used for retrying to encode a frame
546  RateControlContext rc_context; ///< contains stuff only accessed in ratecontrol.c
547 
548  /* statistics, used for 2-pass encoding */
549  int mv_bits;
553  int i_count;
554  int f_count;
555  int b_count;
557  int misc_bits; ///< cbp, mb_type
558  int last_bits; ///< temp var used for calculating the above vars
559 
560  /* error concealment / resync */
561  int resync_mb_x; ///< x position of last resync marker
562  int resync_mb_y; ///< y position of last resync marker
563  GetBitContext last_resync_gb; ///< used to search for the next resync marker
564  int mb_num_left; ///< number of MBs left in this video packet (for partitioned Slices only)
565  int next_p_frame_damaged; ///< set if the next p frame is damaged, to avoid showing trashed b frames
567 
569 
570  /* H.263 specific */
572  int obmc; ///< overlapped block motion compensation
573  int mb_info; ///< interval for outputting info about mb offsets as side data
577  int ehc_mode;
578 
579  /* H.263+ specific */
580  int umvplus; ///< == H263+ && unrestricted_mv
581  int h263_aic_dir; ///< AIC direction: 0 = left, 1 = top
583  int alt_inter_vlc; ///< alternative inter vlc
587 
588  /* mpeg4 specific */
589  ///< number of bits to represent the fractional part of time (encoder only)
592  int time_base; ///< time in seconds of last I,P,S Frame
593  int64_t time; ///< time of current frame
595  uint16_t pp_time; ///< time distance between the last 2 p,s,i frames
596  uint16_t pb_time; ///< time distance between the last b and p,s,i frame
597  uint16_t pp_field_time;
598  uint16_t pb_field_time; ///< like above, just for interlaced
600  int sprite_offset[2][2]; ///< sprite offset[isChroma][isMVY]
601  int sprite_delta[2][2]; ///< sprite_delta [isY][isMVY]
602  int mcsel;
604  int quarter_sample; ///< 1->qpel, 0->half pel ME/MC
605  int aspect_ratio_info; //FIXME remove
607  int data_partitioning; ///< data partitioning flag from header
608  int partitioned_frame; ///< is current frame partitioned
609  int low_delay; ///< no reordering needed / has no b-frames
610  int vo_type;
611  int vol_control_parameters; ///< does the stream contain the low_delay flag, used to workaround buggy encoders
612  PutBitContext tex_pb; ///< used for data partitioned VOPs
613  PutBitContext pb2; ///< used for data partitioned VOPs
615  int padding_bug_score; ///< used to detect the VERY common padding bug in MPEG4
616 
617  /* divx specific, used to workaround (many) bugs in divx5 */
619  uint8_t *bitstream_buffer; //Divx 5.01 puts several frames in a single one, this is used to reorder them
622 
623  /* RV10 specific */
624  int rv10_version; ///< RV10 version: 0 or 3
627 
628  /* MJPEG specific */
630  int esc_pos;
631 
632  /* MSMPEG4 specific */
638  int slice_height; ///< in macroblocks
639  int first_slice_line; ///< used in mpeg4 too to handle resync markers
641  int msmpeg4_version; ///< 0=not msmpeg4, 1=mp41, 2=mp42, 3=mp43/divx3 4=wmv1/7 5=wmv2/8
645  /** [mb_intra][isChroma][level][run][last] */
646  int (*ac_stats)[2][MAX_LEVEL+1][MAX_RUN+1][2];
648  int mspel;
649 
650  /* decompression specific */
652 
653  /* Mpeg1 specific */
654  int gop_picture_number; ///< index of the first picture of a GOP based on fake_pic_num & mpeg1 specific
655  int last_mv_dir; ///< last mv_dir, used for b frame encoding
656  uint8_t *vbv_delay_ptr; ///< pointer to vbv_delay in the bitstream
657 
658  /* MPEG-2-specific - I wished not to have to support this mess. */
660  int mpeg_f_code[2][2];
662 /* picture type */
663 #define PICT_TOP_FIELD 1
664 #define PICT_BOTTOM_FIELD 2
665 #define PICT_FRAME 3
666 
677 #define CHROMA_420 1
678 #define CHROMA_422 2
679 #define CHROMA_444 3
680  int chroma_x_shift;//depend on pix_format, that depend on chroma_format
682 
684  int full_pel[2];
686  int first_field; ///< is 1 for the first field of a field picture 0 otherwise
687  int drop_frame_timecode; ///< timecode is in drop frame format.
688  int scan_offset; ///< reserve space for SVCD scan offset user data.
689 
690  /* RTP specific */
691  int rtp_mode;
692 
693  char *tc_opt_str; ///< timecode option string
694  AVTimecode tc; ///< timecode context
695 
697  int swap_uv; //vcr2 codec is an MPEG-2 variant with U and V swapped
698  int pack_pblocks; //xvmc needs to keep blocks without gaps.
699  int16_t (*pblocks[12])[64];
700 
701  int16_t (*block)[64]; ///< points to one of the following blocks
702  int16_t (*blocks)[12][64]; // for HQ mode we need to keep the best block
703  int (*decode_mb)(struct MpegEncContext *s, int16_t block[6][64]); // used by some codecs to avoid a switch()
704 #define SLICE_OK 0
705 #define SLICE_ERROR -1
706 #define SLICE_END -2 ///<end marker found
707 #define SLICE_NOEND -3 ///<no end marker or error found but mb count exceeded
708 
710  int16_t *block/*align 16*/, int n, int qscale);
712  int16_t *block/*align 16*/, int n, int qscale);
714  int16_t *block/*align 16*/, int n, int qscale);
716  int16_t *block/*align 16*/, int n, int qscale);
718  int16_t *block/*align 16*/, int n, int qscale);
720  int16_t *block/*align 16*/, int n, int qscale);
722  int16_t *block/*align 16*/, int n, int qscale);
724  int16_t *block/*align 16*/, int n, int qscale);
725  void (*dct_unquantize_intra)(struct MpegEncContext *s, // unquantizer to use (mpeg4 can use both)
726  int16_t *block/*align 16*/, int n, int qscale);
727  void (*dct_unquantize_inter)(struct MpegEncContext *s, // unquantizer to use (mpeg4 can use both)
728  int16_t *block/*align 16*/, int n, int qscale);
729  int (*dct_quantize)(struct MpegEncContext *s, int16_t *block/*align 16*/, int n, int qscale, int *overflow);
730  int (*fast_dct_quantize)(struct MpegEncContext *s, int16_t *block/*align 16*/, int n, int qscale, int *overflow);
731  void (*denoise_dct)(struct MpegEncContext *s, int16_t *block);
732 
733  int mpv_flags; ///< flags set by private options
735 
736  /* temp buffers for rate control */
737  float *cplx_tab, *bits_tab;
738 
739  /* flag to indicate a reinitialization is required, e.g. after
740  * a frame size change */
742 
744 
746 
747  /* temporary frames used by b_frame_strategy = 2 */
750 
751 #define REBASE_PICTURE(pic, new_ctx, old_ctx) \
752  ((pic && pic >= old_ctx->picture && \
753  pic < old_ctx->picture + MAX_PICTURE_COUNT) ? \
754  &new_ctx->picture[pic - old_ctx->picture] : NULL)
755 
756 /* mpegvideo_enc common options */
757 #define FF_MPV_FLAG_SKIP_RD 0x0001
758 #define FF_MPV_FLAG_STRICT_GOP 0x0002
759 #define FF_MPV_FLAG_QP_RD 0x0004
760 #define FF_MPV_FLAG_CBP_RD 0x0008
761 
762 #define FF_MPV_OFFSET(x) offsetof(MpegEncContext, x)
763 #define FF_MPV_OPT_FLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
764 #define FF_MPV_COMMON_OPTS \
765 { "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" },\
766 { "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" },\
767 { "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" },\
768 { "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" },\
769 { "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" },\
770 { "luma_elim_threshold", "single coefficient elimination threshold for luminance (negative values also consider dc coefficient)",\
771  FF_MPV_OFFSET(luma_elim_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FF_MPV_OPT_FLAGS },\
772 { "chroma_elim_threshold", "single coefficient elimination threshold for chrominance (negative values also consider dc coefficient)",\
773  FF_MPV_OFFSET(chroma_elim_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FF_MPV_OPT_FLAGS },\
774 { "quantizer_noise_shaping", NULL, FF_MPV_OFFSET(quantizer_noise_shaping), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FF_MPV_OPT_FLAGS },\
775 { "error_rate", "Simulate errors in the bitstream to test error concealment.", \
776  FF_MPV_OFFSET(error_rate), 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  */
794 
799 void ff_MPV_decode_mb(MpegEncContext *s, int16_t block[12][64]);
805  const AVFrame *frame, int *got_packet);
813  int y, int h, int picture_structure, int first_field,
814  int low_delay);
815 void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h);
817 
820  int *low_delay,
821  int mb_width, int mb_height, int mb_stride, int quarter_sample);
822 
823 int ff_mpv_export_qp_table(MpegEncContext *s, AVFrame *f, Picture *p, int qp_type);
824 
825 void ff_write_quant_matrix(PutBitContext *pb, uint16_t *matrix);
826 int ff_find_unused_picture(MpegEncContext *s, int shared);
827 void ff_denoise_dct(MpegEncContext *s, int16_t *block);
832 void ff_set_qscale(MpegEncContext * s, int qscale);
833 
835 
838 void ff_convert_matrix(DSPContext *dsp, int (*qmat)[64], uint16_t (*qmat16)[2][64],
839  const uint16_t *quant_matrix, int bias, int qmin, int qmax, int intra);
840 int ff_dct_quantize_c(MpegEncContext *s, int16_t *block, int n, int qscale, int *overflow);
841 
843 
845  uint8_t *dest_y, uint8_t *dest_cb,
846  uint8_t *dest_cr, int dir,
848  op_pixels_func (*pix_op)[4],
849  qpel_mc_func (*qpix_op)[16]);
850 
851 /**
852  * Allocate a Picture.
853  * The pixels are allocated/set by calling get_buffer() if shared = 0.
854  */
855 int ff_alloc_picture(MpegEncContext *s, Picture *pic, int shared);
856 
857 extern const enum AVPixelFormat ff_pixfmt_list_420[];
858 
859 /**
860  * permute block according to permuatation.
861  * @param last last non zero element in scantable order
862  */
863 void ff_block_permute(int16_t *block, uint8_t *permutation, const uint8_t *scantable, int last);
864 
865 static inline void ff_update_block_index(MpegEncContext *s){
866  const int block_size= 8 >> s->avctx->lowres;
867 
868  s->block_index[0]+=2;
869  s->block_index[1]+=2;
870  s->block_index[2]+=2;
871  s->block_index[3]+=2;
872  s->block_index[4]++;
873  s->block_index[5]++;
874  s->dest[0]+= 2*block_size;
875  s->dest[1]+= block_size;
876  s->dest[2]+= block_size;
877 }
878 
879 static inline int get_bits_diff(MpegEncContext *s){
880  const int bits= put_bits_count(&s->pb);
881  const int last= s->last_bits;
882 
883  s->last_bits = bits;
884 
885  return bits - last;
886 }
887 
888 static inline int ff_h263_round_chroma(int x){
889  static const uint8_t h263_chroma_roundtab[16] = {
890  // 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
891  0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
892  };
893  return h263_chroma_roundtab[x & 0xf] + (x >> 3);
894 }
895 
896 /* motion_est.c */
898  int mb_x, int mb_y);
900  int mb_x, int mb_y);
901 int ff_get_best_fcode(MpegEncContext * s, int16_t (*mv_table)[2], int type);
903 void ff_fix_long_mvs(MpegEncContext * s, uint8_t *field_select_table, int field_select,
904  int16_t (*mv_table)[2], int f_code, int type, int truncate);
905 int ff_init_me(MpegEncContext *s);
907 int ff_epzs_motion_search(MpegEncContext * s, int *mx_ptr, int *my_ptr,
908  int P[10][2], int src_index, int ref_index, int16_t (*last_mv)[2],
909  int ref_mv_scale, int size, int h);
910 int ff_get_mb_score(MpegEncContext * s, int mx, int my, int src_index,
911  int ref_index, int size, int h, int add_rate);
912 
913 /* mpeg12.c */
914 extern const uint8_t ff_mpeg1_dc_scale_table[128];
915 extern const uint8_t * const ff_mpeg2_dc_scale_table[4];
916 
919  int16_t block[6][64],
920  int motion_x, int motion_y);
923 
924 extern const uint8_t ff_aic_dc_scale_table[32];
925 extern const uint8_t ff_h263_chroma_qscale_table[32];
926 
927 /* rv10.c */
929 int ff_rv_decode_dc(MpegEncContext *s, int n);
931 
932 
933 /* msmpeg4.c */
937  int16_t block[6][64],
938  int motion_x, int motion_y);
940 int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size);
945 void ff_wmv2_add_mb(MpegEncContext *s, int16_t block[6][64], uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr);
947  uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
948  uint8_t **ref_picture, op_pixels_func (*pix_op)[4],
949  int motion_x, int motion_y, int h);
952  int16_t block[6][64],
953  int motion_x, int motion_y);
954 
958 
959 
960 #endif /* AVCODEC_MPEGVIDEO_H */