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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 "put_bits.h"
37 #include "ratecontrol.h"
38 #include "parser.h"
39 #include "mpeg12data.h"
40 #include "rl.h"
41 #include "videodsp.h"
42 
43 #include "libavutil/opt.h"
44 #include "libavutil/timecode.h"
45 
46 #define FRAME_SKIPPED 100 ///< return value for header parsers if frame is not coded
47 
48 enum OutputFormat {
49  FMT_MPEG1,
50  FMT_H261,
51  FMT_H263,
52  FMT_MJPEG,
53  FMT_H264,
54 };
55 
56 #define MPEG_BUF_SIZE (16 * 1024)
57 
58 #define QMAT_SHIFT_MMX 16
59 #define QMAT_SHIFT 21
60 
61 #define MAX_FCODE 7
62 #define MAX_MV 4096
63 
64 #define MAX_THREADS 32
65 #define MAX_PICTURE_COUNT 36
66 
67 #define ME_MAP_SIZE 64
68 #define ME_MAP_SHIFT 3
69 #define ME_MAP_MV_BITS 11
70 
71 #define MAX_MB_BYTES (30*16*16*3/8 + 120)
72 
73 #define INPLACE_OFFSET 16
74 
75 /* Start codes. */
76 #define SEQ_END_CODE 0x000001b7
77 #define SEQ_START_CODE 0x000001b3
78 #define GOP_START_CODE 0x000001b8
79 #define PICTURE_START_CODE 0x00000100
80 #define SLICE_MIN_START_CODE 0x00000101
81 #define SLICE_MAX_START_CODE 0x000001af
82 #define EXT_START_CODE 0x000001b5
83 #define USER_START_CODE 0x000001b2
84 
85 /**
86  * Value of Picture.reference when Picture is not a reference picture, but
87  * is held for delayed output.
88  */
89 #define DELAYED_PIC_REF 4
90 
91 struct MpegEncContext;
92 
93 /**
94  * Picture.
95  */
96 typedef struct Picture{
97  struct AVFrame f;
98 
99  int8_t *qscale_table_base;
100  int16_t (*motion_val_base[2])[2];
101  uint32_t *mb_type_base;
102 #define MB_TYPE_INTRA MB_TYPE_INTRA4x4 //default mb_type if there is just one type
103 #define IS_INTRA4x4(a) ((a)&MB_TYPE_INTRA4x4)
104 #define IS_INTRA16x16(a) ((a)&MB_TYPE_INTRA16x16)
105 #define IS_PCM(a) ((a)&MB_TYPE_INTRA_PCM)
106 #define IS_INTRA(a) ((a)&7)
107 #define IS_INTER(a) ((a)&(MB_TYPE_16x16|MB_TYPE_16x8|MB_TYPE_8x16|MB_TYPE_8x8))
108 #define IS_SKIP(a) ((a)&MB_TYPE_SKIP)
109 #define IS_INTRA_PCM(a) ((a)&MB_TYPE_INTRA_PCM)
110 #define IS_INTERLACED(a) ((a)&MB_TYPE_INTERLACED)
111 #define IS_DIRECT(a) ((a)&MB_TYPE_DIRECT2)
112 #define IS_GMC(a) ((a)&MB_TYPE_GMC)
113 #define IS_16X16(a) ((a)&MB_TYPE_16x16)
114 #define IS_16X8(a) ((a)&MB_TYPE_16x8)
115 #define IS_8X16(a) ((a)&MB_TYPE_8x16)
116 #define IS_8X8(a) ((a)&MB_TYPE_8x8)
117 #define IS_SUB_8X8(a) ((a)&MB_TYPE_16x16) //note reused
118 #define IS_SUB_8X4(a) ((a)&MB_TYPE_16x8) //note reused
119 #define IS_SUB_4X8(a) ((a)&MB_TYPE_8x16) //note reused
120 #define IS_SUB_4X4(a) ((a)&MB_TYPE_8x8) //note reused
121 #define IS_ACPRED(a) ((a)&MB_TYPE_ACPRED)
122 #define IS_QUANT(a) ((a)&MB_TYPE_QUANT)
123 #define IS_DIR(a, part, list) ((a) & (MB_TYPE_P0L0<<((part)+2*(list))))
124 #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
125 #define HAS_CBP(a) ((a)&MB_TYPE_CBP)
126 
127  int field_poc[2]; ///< h264 top/bottom POC
128  int poc; ///< h264 frame POC
129  int frame_num; ///< h264 frame_num (raw frame_num from slice header)
130  int mmco_reset; ///< h264 MMCO_RESET set this 1. Reordering code must not mix pictures before and after MMCO_RESET.
131  int pic_id; /**< h264 pic_num (short -> no wrap version of pic_num,
132  pic_num & max_pic_num; long -> long_pic_num) */
133  int long_ref; ///< 1->long term reference 0->short term reference
134  int ref_poc[2][2][32]; ///< h264 POCs of the frames/fields used as reference (FIXME need per slice)
135  int ref_count[2][2]; ///< number of entries in ref_poc (FIXME need per slice)
136  int mbaff; ///< h264 1 -> MBAFF frame 0-> not MBAFF
137  int field_picture; ///< whether or not the picture was encoded in separate fields
138  int sync; ///< has been decoded after a keyframe
139 
140  int mb_var_sum; ///< sum of MB variance for current frame
141  int mc_mb_var_sum; ///< motion compensated MB variance for current frame
142  uint16_t *mb_var; ///< Table for MB variances
143  uint16_t *mc_mb_var; ///< Table for motion compensated MB variances
144  uint8_t *mb_mean; ///< Table for MB luminance
145  int b_frame_score; /* */
146  void *owner2; ///< pointer to the context that allocated this picture
147  int needs_realloc; ///< Picture needs to be reallocated (eg due to a frame size change)
148  int period_since_free; ///< "cycles" since this Picture has been freed
149 } Picture;
150 
151 /**
152  * Motion estimation context.
153  */
154 typedef struct MotionEstContext{
155  AVCodecContext *avctx;
156  int skip; ///< set if ME is skipped for the current MB
157  int co_located_mv[4][2]; ///< mv from last P-frame for direct mode ME
158  int direct_basis_mv[4][2];
159  uint8_t *scratchpad; ///< data area for the ME algo, so that the ME does not need to malloc/free
160  uint8_t *best_mb;
161  uint8_t *temp_mb[2];
162  uint8_t *temp;
163  int best_bits;
164  uint32_t *map; ///< map to avoid duplicate evaluations
165  uint32_t *score_map; ///< map to store the scores
166  unsigned map_generation;
167  int pre_penalty_factor;
168  int penalty_factor; /**< an estimate of the bits required to
169  code a given mv value, e.g. (1,0) takes
170  more bits than (0,0). We have to
171  estimate whether any reduction in
172  residual is worth the extra bits. */
173  int sub_penalty_factor;
174  int mb_penalty_factor;
175  int flags;
176  int sub_flags;
177  int mb_flags;
178  int pre_pass; ///< = 1 for the pre pass
179  int dia_size;
180  int xmin;
181  int xmax;
182  int ymin;
183  int ymax;
184  int pred_x;
185  int pred_y;
186  uint8_t *src[4][4];
187  uint8_t *ref[4][4];
188  int stride;
189  int uvstride;
190  /* temp variables for picture complexity calculation */
191  int mc_mb_var_sum_temp;
192  int mb_var_sum_temp;
193  int scene_change_score;
194 /* cmp, chroma_cmp;*/
195  op_pixels_func (*hpel_put)[4];
196  op_pixels_func (*hpel_avg)[4];
197  qpel_mc_func (*qpel_put)[16];
198  qpel_mc_func (*qpel_avg)[16];
199  uint8_t (*mv_penalty)[MAX_MV*2+1]; ///< amount of bits needed to encode a MV
200  uint8_t *current_mv_penalty;
201  int (*sub_motion_search)(struct MpegEncContext * s,
202  int *mx_ptr, int *my_ptr, int dmin,
203  int src_index, int ref_index,
204  int size, int h);
205 }MotionEstContext;
206 
207 /**
208  * MpegEncContext.
209  */
210 typedef struct MpegEncContext {
211  AVClass *class;
212  struct AVCodecContext *avctx;
213  /* the following parameters must be initialized before encoding */
214  int width, height;///< picture size. must be a multiple of 16
215  int gop_size;
216  int intra_only; ///< if true, only intra pictures are generated
217  int bit_rate; ///< wanted bit rate
218  enum OutputFormat out_format; ///< output format
219  int h263_pred; ///< use mpeg4/h263 ac/dc predictions
220  int pb_frame; ///< PB frame mode (0 = none, 1 = base, 2 = improved)
221 
222 /* the following codec id fields are deprecated in favor of codec_id */
223  int h263_plus; ///< h263 plus headers
224  int h263_flv; ///< use flv h263 header
225 
226  enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
227  int fixed_qscale; ///< fixed qscale if non zero
228  int encoding; ///< true if we are encoding (vs decoding)
229  int flags; ///< AVCodecContext.flags (HQ, MV4, ...)
230  int flags2; ///< AVCodecContext.flags2
231  int max_b_frames; ///< max number of b-frames for encoding
232  int luma_elim_threshold;
233  int chroma_elim_threshold;
234  int strict_std_compliance; ///< strictly follow the std (MPEG4, ...)
235  int workaround_bugs; ///< workaround bugs in encoders which cannot be detected automatically
236  int codec_tag; ///< internal codec_tag upper case converted from avctx codec_tag
237  int stream_codec_tag; ///< internal stream_codec_tag upper case converted from avctx stream_codec_tag
238  /* the following fields are managed internally by the encoder */
239 
240  /* sequence parameters */
241  int context_initialized;
242  int input_picture_number; ///< used to set pic->display_picture_number, should not be used for/by anything else
243  int coded_picture_number; ///< used to set pic->coded_picture_number, should not be used for/by anything else
244  int picture_number; //FIXME remove, unclear definition
245  int picture_in_gop_number; ///< 0-> first pic in gop, ...
246  int mb_width, mb_height; ///< number of MBs horizontally & vertically
247  int mb_stride; ///< mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11
248  int b8_stride; ///< 2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
249  int b4_stride; ///< 4*mb_width+1 used for some 4x4 block arrays to allow simple addressing
250  int h_edge_pos, v_edge_pos;///< horizontal / vertical position of the right/bottom edge (pixel replication)
251  int mb_num; ///< number of MBs of a picture
252  int linesize; ///< line size, in bytes, may be different from width
253  int uvlinesize; ///< line size, for chroma in bytes, may be different from width
254  Picture *picture; ///< main picture buffer
255  Picture **input_picture; ///< next pictures on display order for encoding
256  Picture **reordered_input_picture; ///< pointer to the next pictures in codedorder for encoding
257 
258  int y_dc_scale, c_dc_scale;
259  int ac_pred;
260  int block_last_index[12]; ///< last non zero coefficient in block
261  int h263_aic; ///< Advanded INTRA Coding (AIC)
262 
263  /* scantables */
264  ScanTable inter_scantable; ///< if inter == intra then intra should be used to reduce tha cache usage
265  ScanTable intra_scantable;
266  ScanTable intra_h_scantable;
267  ScanTable intra_v_scantable;
268 
269  /* WARNING: changes above this line require updates to hardcoded
270  * offsets used in asm. */
271 
272  int64_t user_specified_pts;///< last non zero pts from AVFrame which was passed into avcodec_encode_video()
273  /**
274  * pts difference between the first and second input frame, used for
275  * calculating dts of the first frame when there's a delay */
276  int64_t dts_delta;
277  /**
278  * reordered pts to be used as dts for the next output frame when there's
279  * a delay */
280  int64_t reordered_pts;
281 
282  /** bit output */
283  PutBitContext pb;
284 
285  int start_mb_y; ///< start mb_y of this thread (so current thread should process start_mb_y <= row < end_mb_y)
286  int end_mb_y; ///< end mb_y of this thread (so current thread should process start_mb_y <= row < end_mb_y)
287  struct MpegEncContext *thread_context[MAX_THREADS];
288  int slice_context_count; ///< number of used thread_contexts
289 
290  /**
291  * copy of the previous picture structure.
292  * note, linesize & data, might not match the previous picture (for field pictures)
293  */
294  Picture last_picture;
295 
296  /**
297  * copy of the next picture structure.
298  * note, linesize & data, might not match the next picture (for field pictures)
299  */
300  Picture next_picture;
301 
302  /**
303  * copy of the source picture structure for encoding.
304  * note, linesize & data, might not match the source picture (for field pictures)
305  */
306  Picture new_picture;
307 
308  /**
309  * copy of the current picture structure.
310  * note, linesize & data, might not match the current picture (for field pictures)
311  */
312  Picture current_picture; ///< buffer to store the decompressed current picture
313 
314  Picture *last_picture_ptr; ///< pointer to the previous picture.
315  Picture *next_picture_ptr; ///< pointer to the next picture (for bidir pred)
316  Picture *current_picture_ptr; ///< pointer to the current picture
317  int picture_count; ///< number of allocated pictures (MAX_PICTURE_COUNT * avctx->thread_count)
318  int picture_range_start, picture_range_end; ///< the part of picture that this context can allocate in
319  uint8_t *visualization_buffer[3]; ///< temporary buffer vor MV visualization
320  int last_dc[3]; ///< last DC values for MPEG1
321  int16_t *dc_val_base;
322  int16_t *dc_val[3]; ///< used for mpeg4 DC prediction, all 3 arrays must be continuous
323  const uint8_t *y_dc_scale_table; ///< qscale -> y_dc_scale table
324  const uint8_t *c_dc_scale_table; ///< qscale -> c_dc_scale table
325  const uint8_t *chroma_qscale_table; ///< qscale -> chroma_qscale (h263)
326  uint8_t *coded_block_base;
327  uint8_t *coded_block; ///< used for coded block pattern prediction (msmpeg4v3, wmv1)
328  int16_t (*ac_val_base)[16];
329  int16_t (*ac_val[3])[16]; ///< used for for mpeg4 AC prediction, all 3 arrays must be continuous
330  int mb_skipped; ///< MUST BE SET only during DECODING
331  uint8_t *mbskip_table; /**< used to avoid copy if macroblock skipped (for black regions for example)
332  and used for b-frame encoding & decoding (contains skip table of next P Frame) */
333  uint8_t *mbintra_table; ///< used to avoid setting {ac, dc, cbp}-pred stuff to zero on inter MB decoding
334  uint8_t *cbp_table; ///< used to store cbp, ac_pred for partitioned decoding
335  uint8_t *pred_dir_table; ///< used to store pred_dir for partitioned decoding
336  uint8_t *edge_emu_buffer; ///< temporary buffer for if MVs point to out-of-frame data
337  uint8_t *rd_scratchpad; ///< scratchpad for rate distortion mb decision
338  uint8_t *obmc_scratchpad;
339  uint8_t *b_scratchpad; ///< scratchpad used for writing into write only buffers
340 
341  int qscale; ///< QP
342  int chroma_qscale; ///< chroma QP
343  unsigned int lambda; ///< lagrange multipler used in rate distortion
344  unsigned int lambda2; ///< (lambda*lambda) >> FF_LAMBDA_SHIFT
345  int *lambda_table;
346  int adaptive_quant; ///< use adaptive quantization
347  int dquant; ///< qscale difference to prev qscale
348  int closed_gop; ///< MPEG1/2 GOP is closed
349  int pict_type; ///< AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
350  int vbv_delay;
351  int last_pict_type; //FIXME removes
352  int last_non_b_pict_type; ///< used for mpeg4 gmc b-frames & ratecontrol
353  int droppable;
354  int frame_rate_index;
355  AVRational mpeg2_frame_rate_ext;
356  int last_lambda_for[5]; ///< last lambda for a specific pict type
357  int skipdct; ///< skip dct and code zero residual
358 
359  /* motion compensation */
360  int unrestricted_mv; ///< mv can point outside of the coded picture
361  int h263_long_vectors; ///< use horrible h263v1 long vector mode
362 
363  DSPContext dsp; ///< pointers for accelerated dsp functions
364  H264ChromaContext h264chroma;
365  VideoDSPContext vdsp;
366  int f_code; ///< forward MV resolution
367  int b_code; ///< backward MV resolution for B Frames (mpeg4)
368  int16_t (*p_mv_table_base)[2];
369  int16_t (*b_forw_mv_table_base)[2];
370  int16_t (*b_back_mv_table_base)[2];
371  int16_t (*b_bidir_forw_mv_table_base)[2];
372  int16_t (*b_bidir_back_mv_table_base)[2];
373  int16_t (*b_direct_mv_table_base)[2];
374  int16_t (*p_field_mv_table_base[2][2])[2];
375  int16_t (*b_field_mv_table_base[2][2][2])[2];
376  int16_t (*p_mv_table)[2]; ///< MV table (1MV per MB) p-frame encoding
377  int16_t (*b_forw_mv_table)[2]; ///< MV table (1MV per MB) forward mode b-frame encoding
378  int16_t (*b_back_mv_table)[2]; ///< MV table (1MV per MB) backward mode b-frame encoding
379  int16_t (*b_bidir_forw_mv_table)[2]; ///< MV table (1MV per MB) bidir mode b-frame encoding
380  int16_t (*b_bidir_back_mv_table)[2]; ///< MV table (1MV per MB) bidir mode b-frame encoding
381  int16_t (*b_direct_mv_table)[2]; ///< MV table (1MV per MB) direct mode b-frame encoding
382  int16_t (*p_field_mv_table[2][2])[2]; ///< MV table (2MV per MB) interlaced p-frame encoding
383  int16_t (*b_field_mv_table[2][2][2])[2];///< MV table (4MV per MB) interlaced b-frame encoding
384  uint8_t (*p_field_select_table[2]);
385  uint8_t (*b_field_select_table[2][2]);
386  int me_method; ///< ME algorithm
387  int mv_dir;
388 #define MV_DIR_FORWARD 1
389 #define MV_DIR_BACKWARD 2
390 #define MV_DIRECT 4 ///< bidirectional mode where the difference equals the MV of the last P/S/I-Frame (mpeg4)
391  int mv_type;
392 #define MV_TYPE_16X16 0 ///< 1 vector for the whole mb
393 #define MV_TYPE_8X8 1 ///< 4 vectors (h263, mpeg4 4MV)
394 #define MV_TYPE_16X8 2 ///< 2 vectors, one per 16x8 block
395 #define MV_TYPE_FIELD 3 ///< 2 vectors, one per field
396 #define MV_TYPE_DMV 4 ///< 2 vectors, special mpeg2 Dual Prime Vectors
397  /**motion vectors for a macroblock
398  first coordinate : 0 = forward 1 = backward
399  second " : depend on type
400  third " : 0 = x, 1 = y
401  */
402  int mv[2][4][2];
403  int field_select[2][2];
404  int last_mv[2][2][2]; ///< last MV, used for MV prediction in MPEG1 & B-frame MPEG4
405  uint8_t *fcode_tab; ///< smallest fcode needed for each MV
406  int16_t direct_scale_mv[2][64]; ///< precomputed to avoid divisions in ff_mpeg4_set_direct_mv
407 
408  MotionEstContext me;
409 
410  int no_rounding; /**< apply no rounding to motion compensation (MPEG4, msmpeg4, ...)
411  for b-frames rounding mode is always 0 */
412 
413  /* macroblock layer */
414  int mb_x, mb_y;
415  int mb_skip_run;
416  int mb_intra;
417  uint16_t *mb_type; ///< Table for candidate MB types for encoding
418 #define CANDIDATE_MB_TYPE_INTRA 0x01
419 #define CANDIDATE_MB_TYPE_INTER 0x02
420 #define CANDIDATE_MB_TYPE_INTER4V 0x04
421 #define CANDIDATE_MB_TYPE_SKIPPED 0x08
422 //#define MB_TYPE_GMC 0x10
423 
424 #define CANDIDATE_MB_TYPE_DIRECT 0x10
425 #define CANDIDATE_MB_TYPE_FORWARD 0x20
426 #define CANDIDATE_MB_TYPE_BACKWARD 0x40
427 #define CANDIDATE_MB_TYPE_BIDIR 0x80
428 
429 #define CANDIDATE_MB_TYPE_INTER_I 0x100
430 #define CANDIDATE_MB_TYPE_FORWARD_I 0x200
431 #define CANDIDATE_MB_TYPE_BACKWARD_I 0x400
432 #define CANDIDATE_MB_TYPE_BIDIR_I 0x800
433 
434 #define CANDIDATE_MB_TYPE_DIRECT0 0x1000
435 
436  int block_index[6]; ///< index to current MB in block based arrays with edges
437  int block_wrap[6];
438  uint8_t *dest[3];
439 
440  int *mb_index2xy; ///< mb_index -> mb_x + mb_y*mb_stride
441 
442  /** matrix transmitted in the bitstream */
443  uint16_t intra_matrix[64];
444  uint16_t chroma_intra_matrix[64];
445  uint16_t inter_matrix[64];
446  uint16_t chroma_inter_matrix[64];
447 #define QUANT_BIAS_SHIFT 8
448  int intra_quant_bias; ///< bias for the quantizer
449  int inter_quant_bias; ///< bias for the quantizer
450  int min_qcoeff; ///< minimum encodable coefficient
451  int max_qcoeff; ///< maximum encodable coefficient
452  int ac_esc_length; ///< num of bits needed to encode the longest esc
453  uint8_t *intra_ac_vlc_length;
454  uint8_t *intra_ac_vlc_last_length;
455  uint8_t *inter_ac_vlc_length;
456  uint8_t *inter_ac_vlc_last_length;
457  uint8_t *luma_dc_vlc_length;
458 #define UNI_AC_ENC_INDEX(run,level) ((run)*128 + (level))
459 
460  int coded_score[12];
461 
462  /** precomputed matrix (combine qscale and DCT renorm) */
463  int (*q_intra_matrix)[64];
464  int (*q_chroma_intra_matrix)[64];
465  int (*q_inter_matrix)[64];
466  /** identical to the above but for MMX & these are not permutated, second 64 entries are bias*/
467  uint16_t (*q_intra_matrix16)[2][64];
468  uint16_t (*q_chroma_intra_matrix16)[2][64];
469  uint16_t (*q_inter_matrix16)[2][64];
470 
471  /* noise reduction */
472  int (*dct_error_sum)[64];
473  int dct_count[2];
474  uint16_t (*dct_offset)[64];
475 
476  void *opaque; ///< private data for the user
477 
478  /* bit rate control */
479  int64_t total_bits;
480  int frame_bits; ///< bits used for the current frame
481  int stuffing_bits; ///< bits used for stuffing
482  int next_lambda; ///< next lambda used for retrying to encode a frame
483  RateControlContext rc_context; ///< contains stuff only accessed in ratecontrol.c
484 
485  /* statistics, used for 2-pass encoding */
486  int mv_bits;
487  int header_bits;
488  int i_tex_bits;
489  int p_tex_bits;
490  int i_count;
491  int f_count;
492  int b_count;
493  int skip_count;
494  int misc_bits; ///< cbp, mb_type
495  int last_bits; ///< temp var used for calculating the above vars
496 
497  /* error concealment / resync */
498  int resync_mb_x; ///< x position of last resync marker
499  int resync_mb_y; ///< y position of last resync marker
500  GetBitContext last_resync_gb; ///< used to search for the next resync marker
501  int mb_num_left; ///< number of MBs left in this video packet (for partitioned Slices only)
502  int next_p_frame_damaged; ///< set if the next p frame is damaged, to avoid showing trashed b frames
503  int err_recognition;
504 
505  ParseContext parse_context;
506 
507  /* H.263 specific */
508  int gob_index;
509  int obmc; ///< overlapped block motion compensation
510  int showed_packed_warning; ///< flag for having shown the warning about divxs invalid b frames
511  int mb_info; ///< interval for outputting info about mb offsets as side data
512  int prev_mb_info, last_mb_info;
513  uint8_t *mb_info_ptr;
514  int mb_info_size;
515 
516  /* H.263+ specific */
517  int umvplus; ///< == H263+ && unrestricted_mv
518  int h263_aic_dir; ///< AIC direction: 0 = left, 1 = top
519  int h263_slice_structured;
520  int alt_inter_vlc; ///< alternative inter vlc
521  int modified_quant;
522  int loop_filter;
523  int custom_pcf;
524 
525  /* mpeg4 specific */
526  int time_increment_bits; ///< number of bits to represent the fractional part of time
527  int last_time_base;
528  int time_base; ///< time in seconds of last I,P,S Frame
529  int64_t time; ///< time of current frame
530  int64_t last_non_b_time;
531  uint16_t pp_time; ///< time distance between the last 2 p,s,i frames
532  uint16_t pb_time; ///< time distance between the last b and p,s,i frame
533  uint16_t pp_field_time;
534  uint16_t pb_field_time; ///< like above, just for interlaced
535  int shape;
536  int vol_sprite_usage;
537  int sprite_width;
538  int sprite_height;
539  int sprite_left;
540  int sprite_top;
541  int sprite_brightness_change;
542  int num_sprite_warping_points;
543  int real_sprite_warping_points;
544  uint16_t sprite_traj[4][2]; ///< sprite trajectory points
545  int sprite_offset[2][2]; ///< sprite offset[isChroma][isMVY]
546  int sprite_delta[2][2]; ///< sprite_delta [isY][isMVY]
547  int sprite_shift[2]; ///< sprite shift [isChroma]
548  int mcsel;
549  int quant_precision;
550  int quarter_sample; ///< 1->qpel, 0->half pel ME/MC
551  int scalability;
552  int hierachy_type;
553  int enhancement_type;
554  int new_pred;
555  int reduced_res_vop;
556  int aspect_ratio_info; //FIXME remove
557  int sprite_warping_accuracy;
558  int low_latency_sprite;
559  int data_partitioning; ///< data partitioning flag from header
560  int partitioned_frame; ///< is current frame partitioned
561  int rvlc; ///< reversible vlc
562  int resync_marker; ///< could this stream contain resync markers
563  int low_delay; ///< no reordering needed / has no b-frames
564  int vo_type;
565  int vol_control_parameters; ///< does the stream contain the low_delay flag, used to workaround buggy encoders
566  int intra_dc_threshold; ///< QP above whch the ac VLC should be used for intra dc
567  int use_intra_dc_vlc;
568  PutBitContext tex_pb; ///< used for data partitioned VOPs
569  PutBitContext pb2; ///< used for data partitioned VOPs
570  int mpeg_quant;
571  int t_frame; ///< time distance of first I -> B, used for interlaced b frames
572  int padding_bug_score; ///< used to detect the VERY common padding bug in MPEG4
573  int cplx_estimation_trash_i;
574  int cplx_estimation_trash_p;
575  int cplx_estimation_trash_b;
576 
577  /* divx specific, used to workaround (many) bugs in divx5 */
578  int divx_version;
579  int divx_build;
580  int divx_packed;
581  uint8_t *bitstream_buffer; //Divx 5.01 puts several frames in a single one, this is used to reorder them
582  int bitstream_buffer_size;
583  unsigned int allocated_bitstream_buffer_size;
584 
585  int xvid_build;
586 
587  /* lavc specific stuff, used to workaround bugs in libavcodec */
588  int lavc_build;
589 
590  /* RV10 specific */
591  int rv10_version; ///< RV10 version: 0 or 3
592  int rv10_first_dc_coded[3];
593  int orig_width, orig_height;
594 
595  /* MJPEG specific */
596  struct MJpegContext *mjpeg_ctx;
597  int mjpeg_vsample[3]; ///< vertical sampling factors, default = {2, 1, 1}
598  int mjpeg_hsample[3]; ///< horizontal sampling factors, default = {2, 1, 1}
599  int esc_pos;
600 
601  /* MSMPEG4 specific */
602  int mv_table_index;
603  int rl_table_index;
604  int rl_chroma_table_index;
605  int dc_table_index;
606  int use_skip_mb_code;
607  int slice_height; ///< in macroblocks
608  int first_slice_line; ///< used in mpeg4 too to handle resync markers
609  int flipflop_rounding;
610  int msmpeg4_version; ///< 0=not msmpeg4, 1=mp41, 2=mp42, 3=mp43/divx3 4=wmv1/7 5=wmv2/8
611  int per_mb_rl_table;
612  int esc3_level_length;
613  int esc3_run_length;
614  /** [mb_intra][isChroma][level][run][last] */
615  int (*ac_stats)[2][MAX_LEVEL+1][MAX_RUN+1][2];
616  int inter_intra_pred;
617  int mspel;
618 
619  /* decompression specific */
620  GetBitContext gb;
621 
622  /* Mpeg1 specific */
623  int gop_picture_number; ///< index of the first picture of a GOP based on fake_pic_num & mpeg1 specific
624  int last_mv_dir; ///< last mv_dir, used for b frame encoding
625  int broken_link; ///< no_output_of_prior_pics_flag
626  uint8_t *vbv_delay_ptr; ///< pointer to vbv_delay in the bitstream
627 
628  /* MPEG-2-specific - I wished not to have to support this mess. */
629  int progressive_sequence;
630  int mpeg_f_code[2][2];
631  int picture_structure;
632 /* picture type */
633 #define PICT_TOP_FIELD 1
634 #define PICT_BOTTOM_FIELD 2
635 #define PICT_FRAME 3
636 
637  int intra_dc_precision;
638  int frame_pred_frame_dct;
639  int top_field_first;
640  int concealment_motion_vectors;
641  int q_scale_type;
642  int intra_vlc_format;
643  int alternate_scan;
644  int repeat_first_field;
645  int chroma_420_type;
646  int chroma_format;
647 #define CHROMA_420 1
648 #define CHROMA_422 2
649 #define CHROMA_444 3
650  int chroma_x_shift;//depend on pix_format, that depend on chroma_format
651  int chroma_y_shift;
652 
653  int progressive_frame;
654  int full_pel[2];
655  int interlaced_dct;
656  int first_slice;
657  int first_field; ///< is 1 for the first field of a field picture 0 otherwise
658  int drop_frame_timecode; ///< timecode is in drop frame format.
659  int scan_offset; ///< reserve space for SVCD scan offset user data.
660 
661  /* RTP specific */
662  int rtp_mode;
663 
664  char *tc_opt_str; ///< timecode option string
665  AVTimecode tc; ///< timecode context
666 
667  uint8_t *ptr_lastgob;
668  int swap_uv; //vcr2 codec is an MPEG-2 variant with U and V swapped
669  int16_t (*pblocks[12])[64];
670 
671  int16_t (*block)[64]; ///< points to one of the following blocks
672  int16_t (*blocks)[12][64]; // for HQ mode we need to keep the best block
673  int (*decode_mb)(struct MpegEncContext *s, int16_t block[6][64]); // used by some codecs to avoid a switch()
674 #define SLICE_OK 0
675 #define SLICE_ERROR -1
676 #define SLICE_END -2 ///<end marker found
677 #define SLICE_NOEND -3 ///<no end marker or error found but mb count exceeded
678 
679  void (*dct_unquantize_mpeg1_intra)(struct MpegEncContext *s,
680  int16_t *block/*align 16*/, int n, int qscale);
681  void (*dct_unquantize_mpeg1_inter)(struct MpegEncContext *s,
682  int16_t *block/*align 16*/, int n, int qscale);
683  void (*dct_unquantize_mpeg2_intra)(struct MpegEncContext *s,
684  int16_t *block/*align 16*/, int n, int qscale);
685  void (*dct_unquantize_mpeg2_inter)(struct MpegEncContext *s,
686  int16_t *block/*align 16*/, int n, int qscale);
687  void (*dct_unquantize_h263_intra)(struct MpegEncContext *s,
688  int16_t *block/*align 16*/, int n, int qscale);
689  void (*dct_unquantize_h263_inter)(struct MpegEncContext *s,
690  int16_t *block/*align 16*/, int n, int qscale);
691  void (*dct_unquantize_h261_intra)(struct MpegEncContext *s,
692  int16_t *block/*align 16*/, int n, int qscale);
693  void (*dct_unquantize_h261_inter)(struct MpegEncContext *s,
694  int16_t *block/*align 16*/, int n, int qscale);
695  void (*dct_unquantize_intra)(struct MpegEncContext *s, // unquantizer to use (mpeg4 can use both)
696  int16_t *block/*align 16*/, int n, int qscale);
697  void (*dct_unquantize_inter)(struct MpegEncContext *s, // unquantizer to use (mpeg4 can use both)
698  int16_t *block/*align 16*/, int n, int qscale);
699  int (*dct_quantize)(struct MpegEncContext *s, int16_t *block/*align 16*/, int n, int qscale, int *overflow);
700  int (*fast_dct_quantize)(struct MpegEncContext *s, int16_t *block/*align 16*/, int n, int qscale, int *overflow);
701  void (*denoise_dct)(struct MpegEncContext *s, int16_t *block);
702 
703  int mpv_flags; ///< flags set by private options
704  int quantizer_noise_shaping;
705 
706  /* temp buffers for rate control */
707  float *cplx_tab, *bits_tab;
708 
709  /* flag to indicate a reinitialization is required, e.g. after
710  * a frame size change */
711  int context_reinit;
712 
713  ERContext er;
714 } MpegEncContext;
715 
716 #define REBASE_PICTURE(pic, new_ctx, old_ctx) \
717  ((pic && pic >= old_ctx->picture && \
718  pic < old_ctx->picture + old_ctx->picture_count) ? \
719  &new_ctx->picture[pic - old_ctx->picture] : NULL)
720 
721 /* mpegvideo_enc common options */
722 #define FF_MPV_FLAG_SKIP_RD 0x0001
723 #define FF_MPV_FLAG_STRICT_GOP 0x0002
724 #define FF_MPV_FLAG_QP_RD 0x0004
725 #define FF_MPV_FLAG_CBP_RD 0x0008
726 
727 #define FF_MPV_OFFSET(x) offsetof(MpegEncContext, x)
728 #define FF_MPV_OPT_FLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
729 #define FF_MPV_COMMON_OPTS \
730 { "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" },\
731 { "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" },\
732 { "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" },\
733 { "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" },\
734 { "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" },\
735 { "luma_elim_threshold", "single coefficient elimination threshold for luminance (negative values also consider dc coefficient)",\
736  FF_MPV_OFFSET(luma_elim_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FF_MPV_OPT_FLAGS },\
737 { "chroma_elim_threshold", "single coefficient elimination threshold for chrominance (negative values also consider dc coefficient)",\
738  FF_MPV_OFFSET(chroma_elim_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FF_MPV_OPT_FLAGS },\
739 { "quantizer_noise_shaping", NULL, FF_MPV_OFFSET(quantizer_noise_shaping), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FF_MPV_OPT_FLAGS },
740 
741 extern const AVOption ff_mpv_generic_options[];
742 
743 #define FF_MPV_GENERIC_CLASS(name) \
744 static const AVClass name ## _class = {\
745  .class_name = #name " encoder",\
746  .item_name = av_default_item_name,\
747  .option = ff_mpv_generic_options,\
748  .version = LIBAVUTIL_VERSION_INT,\
749 };
750 
751 /**
752  * Set the given MpegEncContext to common defaults (same for encoding
753  * and decoding). The changed fields will not depend upon the prior
754  * state of the MpegEncContext.
755  */
756 void ff_MPV_common_defaults(MpegEncContext *s);
757 
758 void ff_MPV_decode_defaults(MpegEncContext *s);
759 int ff_MPV_common_init(MpegEncContext *s);
760 int ff_mpv_frame_size_alloc(MpegEncContext *s, int linesize);
761 int ff_MPV_common_frame_size_change(MpegEncContext *s);
762 void ff_MPV_common_end(MpegEncContext *s);
763 void ff_MPV_decode_mb(MpegEncContext *s, int16_t block[12][64]);
764 int ff_MPV_frame_start(MpegEncContext *s, AVCodecContext *avctx);
765 void ff_MPV_frame_end(MpegEncContext *s);
766 int ff_MPV_encode_init(AVCodecContext *avctx);
767 int ff_MPV_encode_end(AVCodecContext *avctx);
768 int ff_MPV_encode_picture(AVCodecContext *avctx, AVPacket *pkt,
769  AVFrame *frame, int *got_packet);
770 void ff_dct_encode_init_x86(MpegEncContext *s);
771 void ff_MPV_common_init_x86(MpegEncContext *s);
772 void ff_MPV_common_init_axp(MpegEncContext *s);
773 void ff_MPV_common_init_arm(MpegEncContext *s);
774 void ff_MPV_common_init_altivec(MpegEncContext *s);
775 void ff_MPV_common_init_bfin(MpegEncContext *s);
776 void ff_clean_intra_table_entries(MpegEncContext *s);
777 void ff_draw_horiz_band(AVCodecContext *avctx, DSPContext *dsp, Picture *cur,
778  Picture *last, int y, int h, int picture_structure,
779  int first_field, int draw_edges, int low_delay,
780  int v_edge_pos, int h_edge_pos);
781 void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h);
782 void ff_mpeg_flush(AVCodecContext *avctx);
783 void ff_print_debug_info(MpegEncContext *s, AVFrame *pict);
784 void ff_write_quant_matrix(PutBitContext *pb, uint16_t *matrix);
785 void ff_release_unused_pictures(MpegEncContext *s, int remove_current);
786 int ff_find_unused_picture(MpegEncContext *s, int shared);
787 void ff_denoise_dct(MpegEncContext *s, int16_t *block);
788 int ff_update_duplicate_context(MpegEncContext *dst, MpegEncContext *src);
789 int ff_MPV_lowest_referenced_row(MpegEncContext *s, int dir);
790 void ff_MPV_report_decode_progress(MpegEncContext *s);
791 int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src);
792 const uint8_t *avpriv_mpv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state);
793 void ff_set_qscale(MpegEncContext * s, int qscale);
794 
795 void ff_mpeg_er_frame_start(MpegEncContext *s);
796 
797 int ff_dct_common_init(MpegEncContext *s);
798 int ff_dct_encode_init(MpegEncContext *s);
799 void ff_convert_matrix(DSPContext *dsp, int (*qmat)[64], uint16_t (*qmat16)[2][64],
800  const uint16_t *quant_matrix, int bias, int qmin, int qmax, int intra);
801 int ff_dct_quantize_c(MpegEncContext *s, int16_t *block, int n, int qscale, int *overflow);
802 
803 void ff_init_block_index(MpegEncContext *s);
804 void ff_copy_picture(Picture *dst, Picture *src);
805 
806 void ff_MPV_motion(MpegEncContext *s,
807  uint8_t *dest_y, uint8_t *dest_cb,
808  uint8_t *dest_cr, int dir,
809  uint8_t **ref_picture,
810  op_pixels_func (*pix_op)[4],
811  qpel_mc_func (*qpix_op)[16]);
812 
813 /**
814  * Allocate a Picture.
815  * The pixels are allocated/set by calling get_buffer() if shared = 0.
816  */
817 int ff_alloc_picture(MpegEncContext *s, Picture *pic, int shared);
818 
819 extern const enum AVPixelFormat ff_pixfmt_list_420[];
820 
821 /**
822  * permute block according to permuatation.
823  * @param last last non zero element in scantable order
824  */
825 void ff_block_permute(int16_t *block, uint8_t *permutation, const uint8_t *scantable, int last);
826 
827 static inline void ff_update_block_index(MpegEncContext *s){
828  const int block_size= 8 >> s->avctx->lowres;
829 
830  s->block_index[0]+=2;
831  s->block_index[1]+=2;
832  s->block_index[2]+=2;
833  s->block_index[3]+=2;
834  s->block_index[4]++;
835  s->block_index[5]++;
836  s->dest[0]+= 2*block_size;
837  s->dest[1]+= block_size;
838  s->dest[2]+= block_size;
839 }
840 
841 static inline int get_bits_diff(MpegEncContext *s){
842  const int bits= put_bits_count(&s->pb);
843  const int last= s->last_bits;
844 
845  s->last_bits = bits;
846 
847  return bits - last;
848 }
849 
850 static inline int ff_h263_round_chroma(int x){
851  static const uint8_t h263_chroma_roundtab[16] = {
852  // 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
853  0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
854  };
855  return h263_chroma_roundtab[x & 0xf] + (x >> 3);
856 }
857 
858 /* motion_est.c */
859 void ff_estimate_p_frame_motion(MpegEncContext * s,
860  int mb_x, int mb_y);
861 void ff_estimate_b_frame_motion(MpegEncContext * s,
862  int mb_x, int mb_y);
863 int ff_get_best_fcode(MpegEncContext * s, int16_t (*mv_table)[2], int type);
864 void ff_fix_long_p_mvs(MpegEncContext * s);
865 void ff_fix_long_mvs(MpegEncContext * s, uint8_t *field_select_table, int field_select,
866  int16_t (*mv_table)[2], int f_code, int type, int truncate);
867 int ff_init_me(MpegEncContext *s);
868 int ff_pre_estimate_p_frame_motion(MpegEncContext * s, int mb_x, int mb_y);
869 int ff_epzs_motion_search(MpegEncContext * s, int *mx_ptr, int *my_ptr,
870  int P[10][2], int src_index, int ref_index, int16_t (*last_mv)[2],
871  int ref_mv_scale, int size, int h);
872 int ff_get_mb_score(MpegEncContext * s, int mx, int my, int src_index,
873  int ref_index, int size, int h, int add_rate);
874 
875 /* mpeg12.c */
876 extern const uint8_t ff_mpeg1_dc_scale_table[128];
877 extern const uint8_t * const ff_mpeg2_dc_scale_table[4];
878 
879 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number);
880 void ff_mpeg1_encode_mb(MpegEncContext *s,
881  int16_t block[6][64],
882  int motion_x, int motion_y);
883 void ff_mpeg1_encode_init(MpegEncContext *s);
884 void ff_mpeg1_encode_slice_header(MpegEncContext *s);
885 void ff_mpeg1_clean_buffers(MpegEncContext *s);
886 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s);
887 
888 extern const uint8_t ff_aic_dc_scale_table[32];
889 extern const uint8_t ff_h263_chroma_qscale_table[32];
890 extern const uint8_t ff_h263_loop_filter_strength[32];
891 
892 /* h261.c */
893 void ff_h261_loop_filter(MpegEncContext *s);
894 void ff_h261_reorder_mb_index(MpegEncContext* s);
895 void ff_h261_encode_mb(MpegEncContext *s,
896  int16_t block[6][64],
897  int motion_x, int motion_y);
898 void ff_h261_encode_picture_header(MpegEncContext * s, int picture_number);
899 void ff_h261_encode_init(MpegEncContext *s);
900 int ff_h261_get_picture_format(int width, int height);
901 
902 
903 /* rv10.c */
904 void ff_rv10_encode_picture_header(MpegEncContext *s, int picture_number);
905 int ff_rv_decode_dc(MpegEncContext *s, int n);
906 void ff_rv20_encode_picture_header(MpegEncContext *s, int picture_number);
907 
908 
909 /* msmpeg4.c */
910 void ff_msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number);
911 void ff_msmpeg4_encode_ext_header(MpegEncContext * s);
912 void ff_msmpeg4_encode_mb(MpegEncContext * s,
913  int16_t block[6][64],
914  int motion_x, int motion_y);
915 int ff_msmpeg4_decode_picture_header(MpegEncContext * s);
916 int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size);
917 int ff_msmpeg4_decode_init(AVCodecContext *avctx);
918 void ff_msmpeg4_encode_init(MpegEncContext *s);
919 int ff_wmv2_decode_picture_header(MpegEncContext * s);
920 int ff_wmv2_decode_secondary_picture_header(MpegEncContext * s);
921 void ff_wmv2_add_mb(MpegEncContext *s, int16_t block[6][64], uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr);
922 void ff_mspel_motion(MpegEncContext *s,
923  uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
924  uint8_t **ref_picture, op_pixels_func (*pix_op)[4],
925  int motion_x, int motion_y, int h);
926 int ff_wmv2_encode_picture_header(MpegEncContext * s, int picture_number);
927 void ff_wmv2_encode_mb(MpegEncContext * s,
928  int16_t block[6][64],
929  int motion_x, int motion_y);
930 
931 #endif /* AVCODEC_MPEGVIDEO_H */
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