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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 "blockdsp.h"
33 #include "error_resilience.h"
34 #include "fdctdsp.h"
35 #include "get_bits.h"
36 #include "h264chroma.h"
37 #include "h263dsp.h"
38 #include "hpeldsp.h"
39 #include "idctdsp.h"
40 #include "me_cmp.h"
41 #include "mpegvideodsp.h"
42 #include "mpegvideoencdsp.h"
43 #include "pixblockdsp.h"
44 #include "put_bits.h"
45 #include "ratecontrol.h"
46 #include "parser.h"
47 #include "mpeg12data.h"
48 #include "qpeldsp.h"
49 #include "rl.h"
50 #include "thread.h"
51 #include "videodsp.h"
52 
53 #include "libavutil/opt.h"
54 #include "libavutil/timecode.h"
55 
56 #define FRAME_SKIPPED 100 ///< return value for header parsers if frame is not coded
57 
58 enum OutputFormat {
59  FMT_MPEG1,
60  FMT_H261,
61  FMT_H263,
62  FMT_MJPEG,
63 };
64 
65 #define MAX_FCODE 7
66 #define MAX_MV 4096
67 
68 #define MAX_THREADS 32
69 #define MAX_PICTURE_COUNT 36
70 
71 #define MAX_B_FRAMES 16
72 
73 #define ME_MAP_SIZE 64
74 
75 #define MAX_MB_BYTES (30*16*16*3/8 + 120)
76 
77 #define INPLACE_OFFSET 16
78 
79 #define EDGE_WIDTH 16
80 
81 /* Start codes. */
82 #define SEQ_END_CODE 0x000001b7
83 #define SEQ_START_CODE 0x000001b3
84 #define GOP_START_CODE 0x000001b8
85 #define PICTURE_START_CODE 0x00000100
86 #define SLICE_MIN_START_CODE 0x00000101
87 #define SLICE_MAX_START_CODE 0x000001af
88 #define EXT_START_CODE 0x000001b5
89 #define USER_START_CODE 0x000001b2
90 
91 /* encoding scans */
92 extern const uint8_t ff_alternate_horizontal_scan[64];
93 extern const uint8_t ff_alternate_vertical_scan[64];
94 
95 struct MpegEncContext;
96 
97 /**
98  * Picture.
99  */
100 typedef struct Picture{
101  struct AVFrame *f;
102  ThreadFrame tf;
103 
104  AVBufferRef *qscale_table_buf;
105  int8_t *qscale_table;
106 
107  AVBufferRef *motion_val_buf[2];
108  int16_t (*motion_val[2])[2];
109 
110  AVBufferRef *mb_type_buf;
111  uint32_t *mb_type; ///< types and macros are defined in mpegutils.h
112 
113  AVBufferRef *mbskip_table_buf;
114  uint8_t *mbskip_table;
115 
116  AVBufferRef *ref_index_buf[2];
117  int8_t *ref_index[2];
118 
119  AVBufferRef *mb_var_buf;
120  uint16_t *mb_var; ///< Table for MB variances
121 
122  AVBufferRef *mc_mb_var_buf;
123  uint16_t *mc_mb_var; ///< Table for motion compensated MB variances
124 
125  int alloc_mb_width; ///< mb_width used to allocate tables
126  int alloc_mb_height; ///< mb_height used to allocate tables
127 
128  AVBufferRef *mb_mean_buf;
129  uint8_t *mb_mean; ///< Table for MB luminance
130 
131  AVBufferRef *hwaccel_priv_buf;
132  /**
133  * hardware accelerator private data
134  */
135  void *hwaccel_picture_private;
136 
137  int field_picture; ///< whether or not the picture was encoded in separate fields
138 
139  int64_t mb_var_sum; ///< sum of MB variance for current frame
140  int64_t mc_mb_var_sum; ///< motion compensated MB variance for current frame
141 
142  int b_frame_score;
143  int needs_realloc; ///< Picture needs to be reallocated (eg due to a frame size change)
144 
145  int reference;
146  int shared;
147 
148  uint64_t error[AV_NUM_DATA_POINTERS];
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  int64_t mc_mb_var_sum_temp;
192  int64_t 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 
213  int y_dc_scale, c_dc_scale;
214  int ac_pred;
215  int block_last_index[12]; ///< last non zero coefficient in block
216  int h263_aic; ///< Advanded INTRA Coding (AIC)
217 
218  /* scantables */
219  ScanTable inter_scantable; ///< if inter == intra then intra should be used to reduce tha cache usage
220  ScanTable intra_scantable;
221  ScanTable intra_h_scantable;
222  ScanTable intra_v_scantable;
223 
224  /* WARNING: changes above this line require updates to hardcoded
225  * offsets used in asm. */
226 
227  struct AVCodecContext *avctx;
228  /* the following parameters must be initialized before encoding */
229  int width, height;///< picture size. must be a multiple of 16
230  int gop_size;
231  int intra_only; ///< if true, only intra pictures are generated
232  int bit_rate; ///< wanted bit rate
233  enum OutputFormat out_format; ///< output format
234  int h263_pred; ///< use mpeg4/h263 ac/dc predictions
235  int pb_frame; ///< PB frame mode (0 = none, 1 = base, 2 = improved)
236 
237 /* the following codec id fields are deprecated in favor of codec_id */
238  int h263_plus; ///< h263 plus headers
239  int h263_flv; ///< use flv h263 header
240 
241  enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
242  int fixed_qscale; ///< fixed qscale if non zero
243  int encoding; ///< true if we are encoding (vs decoding)
244  int flags; ///< AVCodecContext.flags (HQ, MV4, ...)
245  int flags2; ///< AVCodecContext.flags2
246  int max_b_frames; ///< max number of b-frames for encoding
247  int luma_elim_threshold;
248  int chroma_elim_threshold;
249  int strict_std_compliance; ///< strictly follow the std (MPEG4, ...)
250  int workaround_bugs; ///< workaround bugs in encoders which cannot be detected automatically
251  int codec_tag; ///< internal codec_tag upper case converted from avctx codec_tag
252  int stream_codec_tag; ///< internal stream_codec_tag upper case converted from avctx stream_codec_tag
253  /* the following fields are managed internally by the encoder */
254 
255  /* sequence parameters */
256  int context_initialized;
257  int input_picture_number; ///< used to set pic->display_picture_number, should not be used for/by anything else
258  int coded_picture_number; ///< used to set pic->coded_picture_number, should not be used for/by anything else
259  int picture_number; //FIXME remove, unclear definition
260  int picture_in_gop_number; ///< 0-> first pic in gop, ...
261  int mb_width, mb_height; ///< number of MBs horizontally & vertically
262  int mb_stride; ///< mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11
263  int b8_stride; ///< 2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
264  int h_edge_pos, v_edge_pos;///< horizontal / vertical position of the right/bottom edge (pixel replication)
265  int mb_num; ///< number of MBs of a picture
266  ptrdiff_t linesize; ///< line size, in bytes, may be different from width
267  ptrdiff_t uvlinesize; ///< line size, for chroma in bytes, may be different from width
268  Picture *picture; ///< main picture buffer
269  Picture **input_picture; ///< next pictures on display order for encoding
270  Picture **reordered_input_picture; ///< pointer to the next pictures in codedorder for encoding
271 
272  int64_t user_specified_pts; ///< last non-zero pts from AVFrame which was passed into avcodec_encode_video2()
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 last_dc[3]; ///< last DC values for MPEG1
318  int16_t *dc_val_base;
319  int16_t *dc_val[3]; ///< used for mpeg4 DC prediction, all 3 arrays must be continuous
320  const uint8_t *y_dc_scale_table; ///< qscale -> y_dc_scale table
321  const uint8_t *c_dc_scale_table; ///< qscale -> c_dc_scale table
322  const uint8_t *chroma_qscale_table; ///< qscale -> chroma_qscale (h263)
323  uint8_t *coded_block_base;
324  uint8_t *coded_block; ///< used for coded block pattern prediction (msmpeg4v3, wmv1)
325  int16_t (*ac_val_base)[16];
326  int16_t (*ac_val[3])[16]; ///< used for mpeg4 AC prediction, all 3 arrays must be continuous
327  int mb_skipped; ///< MUST BE SET only during DECODING
328  uint8_t *mbskip_table; /**< used to avoid copy if macroblock skipped (for black regions for example)
329  and used for b-frame encoding & decoding (contains skip table of next P Frame) */
330  uint8_t *mbintra_table; ///< used to avoid setting {ac, dc, cbp}-pred stuff to zero on inter MB decoding
331  uint8_t *cbp_table; ///< used to store cbp, ac_pred for partitioned decoding
332  uint8_t *pred_dir_table; ///< used to store pred_dir for partitioned decoding
333  uint8_t *edge_emu_buffer; ///< temporary buffer for if MVs point to out-of-frame data
334  uint8_t *rd_scratchpad; ///< scratchpad for rate distortion mb decision
335  uint8_t *obmc_scratchpad;
336  uint8_t *b_scratchpad; ///< scratchpad used for writing into write only buffers
337 
338  int qscale; ///< QP
339  int chroma_qscale; ///< chroma QP
340  unsigned int lambda; ///< lagrange multipler used in rate distortion
341  unsigned int lambda2; ///< (lambda*lambda) >> FF_LAMBDA_SHIFT
342  int *lambda_table;
343  int adaptive_quant; ///< use adaptive quantization
344  int dquant; ///< qscale difference to prev qscale
345  int closed_gop; ///< MPEG1/2 GOP is closed
346  int pict_type; ///< AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
347  int vbv_delay;
348  int last_pict_type; //FIXME removes
349  int last_non_b_pict_type; ///< used for mpeg4 gmc b-frames & ratecontrol
350  int droppable;
351  int frame_rate_index;
352  AVRational mpeg2_frame_rate_ext;
353  int last_lambda_for[5]; ///< last lambda for a specific pict type
354  int skipdct; ///< skip dct and code zero residual
355 
356  /* motion compensation */
357  int unrestricted_mv; ///< mv can point outside of the coded picture
358  int h263_long_vectors; ///< use horrible h263v1 long vector mode
359 
360  BlockDSPContext bdsp;
361  FDCTDSPContext fdsp;
362  H264ChromaContext h264chroma;
363  HpelDSPContext hdsp;
364  IDCTDSPContext idsp;
365  MECmpContext mecc;
366  MpegVideoDSPContext mdsp;
367  MpegvideoEncDSPContext mpvencdsp;
368  PixblockDSPContext pdsp;
369  QpelDSPContext qdsp;
370  VideoDSPContext vdsp;
371  H263DSPContext h263dsp;
372  int f_code; ///< forward MV resolution
373  int b_code; ///< backward MV resolution for B Frames (mpeg4)
374  int16_t (*p_mv_table_base)[2];
375  int16_t (*b_forw_mv_table_base)[2];
376  int16_t (*b_back_mv_table_base)[2];
377  int16_t (*b_bidir_forw_mv_table_base)[2];
378  int16_t (*b_bidir_back_mv_table_base)[2];
379  int16_t (*b_direct_mv_table_base)[2];
380  int16_t (*p_field_mv_table_base[2][2])[2];
381  int16_t (*b_field_mv_table_base[2][2][2])[2];
382  int16_t (*p_mv_table)[2]; ///< MV table (1MV per MB) p-frame encoding
383  int16_t (*b_forw_mv_table)[2]; ///< MV table (1MV per MB) forward mode b-frame encoding
384  int16_t (*b_back_mv_table)[2]; ///< MV table (1MV per MB) backward mode b-frame encoding
385  int16_t (*b_bidir_forw_mv_table)[2]; ///< MV table (1MV per MB) bidir mode b-frame encoding
386  int16_t (*b_bidir_back_mv_table)[2]; ///< MV table (1MV per MB) bidir mode b-frame encoding
387  int16_t (*b_direct_mv_table)[2]; ///< MV table (1MV per MB) direct mode b-frame encoding
388  int16_t (*p_field_mv_table[2][2])[2]; ///< MV table (2MV per MB) interlaced p-frame encoding
389  int16_t (*b_field_mv_table[2][2][2])[2];///< MV table (4MV per MB) interlaced b-frame encoding
390  uint8_t (*p_field_select_table[2]);
391  uint8_t (*b_field_select_table[2][2]);
392  int me_method; ///< ME algorithm
393  int mv_dir;
394 #define MV_DIR_FORWARD 1
395 #define MV_DIR_BACKWARD 2
396 #define MV_DIRECT 4 ///< bidirectional mode where the difference equals the MV of the last P/S/I-Frame (mpeg4)
397  int mv_type;
398 #define MV_TYPE_16X16 0 ///< 1 vector for the whole mb
399 #define MV_TYPE_8X8 1 ///< 4 vectors (h263, mpeg4 4MV)
400 #define MV_TYPE_16X8 2 ///< 2 vectors, one per 16x8 block
401 #define MV_TYPE_FIELD 3 ///< 2 vectors, one per field
402 #define MV_TYPE_DMV 4 ///< 2 vectors, special mpeg2 Dual Prime Vectors
403  /**motion vectors for a macroblock
404  first coordinate : 0 = forward 1 = backward
405  second " : depend on type
406  third " : 0 = x, 1 = y
407  */
408  int mv[2][4][2];
409  int field_select[2][2];
410  int last_mv[2][2][2]; ///< last MV, used for MV prediction in MPEG1 & B-frame MPEG4
411  uint8_t *fcode_tab; ///< smallest fcode needed for each MV
412  int16_t direct_scale_mv[2][64]; ///< precomputed to avoid divisions in ff_mpeg4_set_direct_mv
413 
414  MotionEstContext me;
415 
416  int no_rounding; /**< apply no rounding to motion compensation (MPEG4, msmpeg4, ...)
417  for b-frames rounding mode is always 0 */
418 
419  /* macroblock layer */
420  int mb_x, mb_y;
421  int mb_skip_run;
422  int mb_intra;
423  uint16_t *mb_type; ///< Table for candidate MB types for encoding (defines in mpegutils.h)
424 
425  int block_index[6]; ///< index to current MB in block based arrays with edges
426  int block_wrap[6];
427  uint8_t *dest[3];
428 
429  int *mb_index2xy; ///< mb_index -> mb_x + mb_y*mb_stride
430 
431  /** matrix transmitted in the bitstream */
432  uint16_t intra_matrix[64];
433  uint16_t chroma_intra_matrix[64];
434  uint16_t inter_matrix[64];
435  uint16_t chroma_inter_matrix[64];
436 
437  int intra_quant_bias; ///< bias for the quantizer
438  int inter_quant_bias; ///< bias for the quantizer
439  int min_qcoeff; ///< minimum encodable coefficient
440  int max_qcoeff; ///< maximum encodable coefficient
441  int ac_esc_length; ///< num of bits needed to encode the longest esc
442  uint8_t *intra_ac_vlc_length;
443  uint8_t *intra_ac_vlc_last_length;
444  uint8_t *inter_ac_vlc_length;
445  uint8_t *inter_ac_vlc_last_length;
446  uint8_t *luma_dc_vlc_length;
447 #define UNI_AC_ENC_INDEX(run,level) ((run)*128 + (level))
448 
449  int coded_score[12];
450 
451  /** precomputed matrix (combine qscale and DCT renorm) */
452  int (*q_intra_matrix)[64];
453  int (*q_chroma_intra_matrix)[64];
454  int (*q_inter_matrix)[64];
455  /** identical to the above but for MMX & these are not permutated, second 64 entries are bias*/
456  uint16_t (*q_intra_matrix16)[2][64];
457  uint16_t (*q_chroma_intra_matrix16)[2][64];
458  uint16_t (*q_inter_matrix16)[2][64];
459 
460  /* noise reduction */
461  int (*dct_error_sum)[64];
462  int dct_count[2];
463  uint16_t (*dct_offset)[64];
464 
465  /* bit rate control */
466  int64_t total_bits;
467  int frame_bits; ///< bits used for the current frame
468  int stuffing_bits; ///< bits used for stuffing
469  int next_lambda; ///< next lambda used for retrying to encode a frame
470  RateControlContext rc_context; ///< contains stuff only accessed in ratecontrol.c
471 
472  /* statistics, used for 2-pass encoding */
473  int mv_bits;
474  int header_bits;
475  int i_tex_bits;
476  int p_tex_bits;
477  int i_count;
478  int f_count;
479  int b_count;
480  int skip_count;
481  int misc_bits; ///< cbp, mb_type
482  int last_bits; ///< temp var used for calculating the above vars
483 
484  /* error concealment / resync */
485  int resync_mb_x; ///< x position of last resync marker
486  int resync_mb_y; ///< y position of last resync marker
487  GetBitContext last_resync_gb; ///< used to search for the next resync marker
488  int mb_num_left; ///< number of MBs left in this video packet (for partitioned Slices only)
489  int next_p_frame_damaged; ///< set if the next p frame is damaged, to avoid showing trashed b frames
490  int err_recognition;
491 
492  ParseContext parse_context;
493 
494  /* H.263 specific */
495  int gob_index;
496  int obmc; ///< overlapped block motion compensation
497  int mb_info; ///< interval for outputting info about mb offsets as side data
498  int prev_mb_info, last_mb_info;
499  uint8_t *mb_info_ptr;
500  int mb_info_size;
501  int ehc_mode;
502 
503  /* H.263+ specific */
504  int umvplus; ///< == H263+ && unrestricted_mv
505  int h263_aic_dir; ///< AIC direction: 0 = left, 1 = top
506  int h263_slice_structured;
507  int alt_inter_vlc; ///< alternative inter vlc
508  int modified_quant;
509  int loop_filter;
510  int custom_pcf;
511 
512  /* mpeg4 specific */
513  ///< number of bits to represent the fractional part of time (encoder only)
514  int time_increment_bits;
515  int last_time_base;
516  int time_base; ///< time in seconds of last I,P,S Frame
517  int64_t time; ///< time of current frame
518  int64_t last_non_b_time;
519  uint16_t pp_time; ///< time distance between the last 2 p,s,i frames
520  uint16_t pb_time; ///< time distance between the last b and p,s,i frame
521  uint16_t pp_field_time;
522  uint16_t pb_field_time; ///< like above, just for interlaced
523  int real_sprite_warping_points;
524  int sprite_offset[2][2]; ///< sprite offset[isChroma][isMVY]
525  int sprite_delta[2][2]; ///< sprite_delta [isY][isMVY]
526  int mcsel;
527  int quant_precision;
528  int quarter_sample; ///< 1->qpel, 0->half pel ME/MC
529  int aspect_ratio_info; //FIXME remove
530  int sprite_warping_accuracy;
531  int data_partitioning; ///< data partitioning flag from header
532  int partitioned_frame; ///< is current frame partitioned
533  int low_delay; ///< no reordering needed / has no b-frames
534  int vo_type;
535  PutBitContext tex_pb; ///< used for data partitioned VOPs
536  PutBitContext pb2; ///< used for data partitioned VOPs
537  int mpeg_quant;
538  int padding_bug_score; ///< used to detect the VERY common padding bug in MPEG4
539 
540  /* divx specific, used to workaround (many) bugs in divx5 */
541  int divx_packed;
542  uint8_t *bitstream_buffer; //Divx 5.01 puts several frames in a single one, this is used to reorder them
543  int bitstream_buffer_size;
544  unsigned int allocated_bitstream_buffer_size;
545 
546  /* RV10 specific */
547  int rv10_version; ///< RV10 version: 0 or 3
548  int rv10_first_dc_coded[3];
549 
550  /* MJPEG specific */
551  struct MJpegContext *mjpeg_ctx;
552  int esc_pos;
553 
554  /* MSMPEG4 specific */
555  int mv_table_index;
556  int rl_table_index;
557  int rl_chroma_table_index;
558  int dc_table_index;
559  int use_skip_mb_code;
560  int slice_height; ///< in macroblocks
561  int first_slice_line; ///< used in mpeg4 too to handle resync markers
562  int flipflop_rounding;
563  int msmpeg4_version; ///< 0=not msmpeg4, 1=mp41, 2=mp42, 3=mp43/divx3 4=wmv1/7 5=wmv2/8
564  int per_mb_rl_table;
565  int esc3_level_length;
566  int esc3_run_length;
567  /** [mb_intra][isChroma][level][run][last] */
568  int (*ac_stats)[2][MAX_LEVEL+1][MAX_RUN+1][2];
569  int inter_intra_pred;
570  int mspel;
571 
572  /* decompression specific */
573  GetBitContext gb;
574 
575  /* Mpeg1 specific */
576  int gop_picture_number; ///< index of the first picture of a GOP based on fake_pic_num & mpeg1 specific
577  int last_mv_dir; ///< last mv_dir, used for b frame encoding
578  uint8_t *vbv_delay_ptr; ///< pointer to vbv_delay in the bitstream
579 
580  /* MPEG-2-specific - I wished not to have to support this mess. */
581  int progressive_sequence;
582  int mpeg_f_code[2][2];
583 
584  // picture structure defines are loaded from mpegutils.h
585  int picture_structure;
586 
587  int intra_dc_precision;
588  int frame_pred_frame_dct;
589  int top_field_first;
590  int concealment_motion_vectors;
591  int q_scale_type;
592  int intra_vlc_format;
593  int alternate_scan;
594  int seq_disp_ext;
595  int repeat_first_field;
596  int chroma_420_type;
597  int chroma_format;
598 #define CHROMA_420 1
599 #define CHROMA_422 2
600 #define CHROMA_444 3
601  int chroma_x_shift;//depend on pix_format, that depend on chroma_format
602  int chroma_y_shift;
603 
604  int progressive_frame;
605  int full_pel[2];
606  int interlaced_dct;
607  int first_field; ///< is 1 for the first field of a field picture 0 otherwise
608  int drop_frame_timecode; ///< timecode is in drop frame format.
609  int scan_offset; ///< reserve space for SVCD scan offset user data.
610 
611  /* RTP specific */
612  int rtp_mode;
613 
614  char *tc_opt_str; ///< timecode option string
615  AVTimecode tc; ///< timecode context
616 
617  uint8_t *ptr_lastgob;
618  int swap_uv; //vcr2 codec is an MPEG-2 variant with U and V swapped
619  int pack_pblocks; //xvmc needs to keep blocks without gaps.
620  int16_t (*pblocks[12])[64];
621 
622  int16_t (*block)[64]; ///< points to one of the following blocks
623  int16_t (*blocks)[12][64]; // for HQ mode we need to keep the best block
624  int (*decode_mb)(struct MpegEncContext *s, int16_t block[6][64]); // used by some codecs to avoid a switch()
625 #define SLICE_OK 0
626 #define SLICE_ERROR -1
627 #define SLICE_END -2 ///<end marker found
628 #define SLICE_NOEND -3 ///<no end marker or error found but mb count exceeded
629 
630  void (*dct_unquantize_mpeg1_intra)(struct MpegEncContext *s,
631  int16_t *block/*align 16*/, int n, int qscale);
632  void (*dct_unquantize_mpeg1_inter)(struct MpegEncContext *s,
633  int16_t *block/*align 16*/, int n, int qscale);
634  void (*dct_unquantize_mpeg2_intra)(struct MpegEncContext *s,
635  int16_t *block/*align 16*/, int n, int qscale);
636  void (*dct_unquantize_mpeg2_inter)(struct MpegEncContext *s,
637  int16_t *block/*align 16*/, int n, int qscale);
638  void (*dct_unquantize_h263_intra)(struct MpegEncContext *s,
639  int16_t *block/*align 16*/, int n, int qscale);
640  void (*dct_unquantize_h263_inter)(struct MpegEncContext *s,
641  int16_t *block/*align 16*/, int n, int qscale);
642  void (*dct_unquantize_intra)(struct MpegEncContext *s, // unquantizer to use (mpeg4 can use both)
643  int16_t *block/*align 16*/, int n, int qscale);
644  void (*dct_unquantize_inter)(struct MpegEncContext *s, // unquantizer to use (mpeg4 can use both)
645  int16_t *block/*align 16*/, int n, int qscale);
646  int (*dct_quantize)(struct MpegEncContext *s, int16_t *block/*align 16*/, int n, int qscale, int *overflow);
647  int (*fast_dct_quantize)(struct MpegEncContext *s, int16_t *block/*align 16*/, int n, int qscale, int *overflow);
648  void (*denoise_dct)(struct MpegEncContext *s, int16_t *block);
649 
650  int mpv_flags; ///< flags set by private options
651  int quantizer_noise_shaping;
652 
653  /* temp buffers for rate control */
654  float *cplx_tab, *bits_tab;
655 
656  /* flag to indicate a reinitialization is required, e.g. after
657  * a frame size change */
658  int context_reinit;
659 
660  ERContext er;
661 
662  int error_rate;
663 
664  /* temporary frames used by b_frame_strategy = 2 */
665  AVFrame *tmp_frames[MAX_B_FRAMES + 2];
666 } MpegEncContext;
667 
668 #define REBASE_PICTURE(pic, new_ctx, old_ctx) \
669  ((pic && pic >= old_ctx->picture && \
670  pic < old_ctx->picture + MAX_PICTURE_COUNT) ? \
671  &new_ctx->picture[pic - old_ctx->picture] : NULL)
672 
673 /* mpegvideo_enc common options */
674 #define FF_MPV_FLAG_SKIP_RD 0x0001
675 #define FF_MPV_FLAG_STRICT_GOP 0x0002
676 #define FF_MPV_FLAG_QP_RD 0x0004
677 #define FF_MPV_FLAG_CBP_RD 0x0008
678 #define FF_MPV_FLAG_NAQ 0x0010
679 #define FF_MPV_FLAG_MV0 0x0020
680 
681 #define FF_MPV_OFFSET(x) offsetof(MpegEncContext, x)
682 #define FF_MPV_OPT_FLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
683 #define FF_MPV_COMMON_OPTS \
684 { "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" },\
685 { "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" },\
686 { "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" },\
687 { "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" },\
688 { "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" },\
689 { "naq", "normalize adaptive quantization", 0, AV_OPT_TYPE_CONST, { .i64 = FF_MPV_FLAG_NAQ }, 0, 0, FF_MPV_OPT_FLAGS, "mpv_flags" },\
690 { "mv0", "always try a mb with mv=<0,0>", 0, AV_OPT_TYPE_CONST, { .i64 = FF_MPV_FLAG_MV0 }, 0, 0, FF_MPV_OPT_FLAGS, "mpv_flags" },\
691 { "luma_elim_threshold", "single coefficient elimination threshold for luminance (negative values also consider dc coefficient)",\
692  FF_MPV_OFFSET(luma_elim_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FF_MPV_OPT_FLAGS },\
693 { "chroma_elim_threshold", "single coefficient elimination threshold for chrominance (negative values also consider dc coefficient)",\
694  FF_MPV_OFFSET(chroma_elim_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FF_MPV_OPT_FLAGS },\
695 { "quantizer_noise_shaping", NULL, FF_MPV_OFFSET(quantizer_noise_shaping), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FF_MPV_OPT_FLAGS },\
696 { "error_rate", "Simulate errors in the bitstream to test error concealment.", \
697  FF_MPV_OFFSET(error_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FF_MPV_OPT_FLAGS },
698 
699 extern const AVOption ff_mpv_generic_options[];
700 
701 #define FF_MPV_GENERIC_CLASS(name) \
702 static const AVClass name ## _class = {\
703  .class_name = #name " encoder",\
704  .item_name = av_default_item_name,\
705  .option = ff_mpv_generic_options,\
706  .version = LIBAVUTIL_VERSION_INT,\
707 };
708 
709 /**
710  * Set the given MpegEncContext to common defaults (same for encoding
711  * and decoding). The changed fields will not depend upon the prior
712  * state of the MpegEncContext.
713  */
714 void ff_mpv_common_defaults(MpegEncContext *s);
715 
716 void ff_dct_encode_init_x86(MpegEncContext *s);
717 
718 int ff_mpv_common_init(MpegEncContext *s);
719 void ff_mpv_common_init_arm(MpegEncContext *s);
720 void ff_mpv_common_init_axp(MpegEncContext *s);
721 void ff_mpv_common_init_neon(MpegEncContext *s);
722 void ff_mpv_common_init_ppc(MpegEncContext *s);
723 void ff_mpv_common_init_x86(MpegEncContext *s);
724 
725 int ff_mpv_common_frame_size_change(MpegEncContext *s);
726 void ff_mpv_common_end(MpegEncContext *s);
727 
728 void ff_mpv_decode_defaults(MpegEncContext *s);
729 void ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx);
730 void ff_mpv_decode_mb(MpegEncContext *s, int16_t block[12][64]);
731 void ff_mpv_report_decode_progress(MpegEncContext *s);
732 
733 int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx);
734 void ff_mpv_frame_end(MpegEncContext *s);
735 
736 int ff_mpv_lowest_referenced_row(MpegEncContext *s, int dir);
737 
738 int ff_mpv_encode_init(AVCodecContext *avctx);
739 void ff_mpv_encode_init_x86(MpegEncContext *s);
740 
741 int ff_mpv_encode_end(AVCodecContext *avctx);
742 int ff_mpv_encode_picture(AVCodecContext *avctx, AVPacket *pkt,
743  const AVFrame *frame, int *got_packet);
744 
745 void ff_clean_intra_table_entries(MpegEncContext *s);
746 void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h);
747 void ff_mpeg_flush(AVCodecContext *avctx);
748 
749 void ff_print_debug_info(MpegEncContext *s, Picture *p, AVFrame *pict);
750 void ff_print_debug_info2(AVCodecContext *avctx, AVFrame *pict, uint8_t *mbskip_table,
751  uint32_t *mbtype_table, int8_t *qscale_table, int16_t (*motion_val[2])[2],
752  int *low_delay,
753  int mb_width, int mb_height, int mb_stride, int quarter_sample);
754 
755 int ff_mpv_export_qp_table(MpegEncContext *s, AVFrame *f, Picture *p, int qp_type);
756 
757 void ff_write_quant_matrix(PutBitContext *pb, uint16_t *matrix);
758 int ff_find_unused_picture(MpegEncContext *s, int shared);
759 void ff_denoise_dct(MpegEncContext *s, int16_t *block);
760 int ff_update_duplicate_context(MpegEncContext *dst, MpegEncContext *src);
761 int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src);
762 void ff_set_qscale(MpegEncContext * s, int qscale);
763 
764 void ff_mpv_idct_init(MpegEncContext *s);
765 int ff_dct_encode_init(MpegEncContext *s);
766 void ff_convert_matrix(MpegEncContext *s, int (*qmat)[64], uint16_t (*qmat16)[2][64],
767  const uint16_t *quant_matrix, int bias, int qmin, int qmax, int intra);
768 int ff_dct_quantize_c(MpegEncContext *s, int16_t *block, int n, int qscale, int *overflow);
769 
770 void ff_init_block_index(MpegEncContext *s);
771 
772 void ff_mpv_motion(MpegEncContext *s,
773  uint8_t *dest_y, uint8_t *dest_cb,
774  uint8_t *dest_cr, int dir,
775  uint8_t **ref_picture,
776  op_pixels_func (*pix_op)[4],
777  qpel_mc_func (*qpix_op)[16]);
778 
779 /**
780  * Allocate a Picture.
781  * The pixels are allocated/set by calling get_buffer() if shared = 0.
782  */
783 int ff_alloc_picture(MpegEncContext *s, Picture *pic, int shared);
784 
785 /**
786  * permute block according to permuatation.
787  * @param last last non zero element in scantable order
788  */
789 void ff_block_permute(int16_t *block, uint8_t *permutation, const uint8_t *scantable, int last);
790 
791 static inline void ff_update_block_index(MpegEncContext *s){
792  const int block_size= 8 >> s->avctx->lowres;
793 
794  s->block_index[0]+=2;
795  s->block_index[1]+=2;
796  s->block_index[2]+=2;
797  s->block_index[3]+=2;
798  s->block_index[4]++;
799  s->block_index[5]++;
800  s->dest[0]+= 2*block_size;
801  s->dest[1]+= block_size;
802  s->dest[2]+= block_size;
803 }
804 
805 static inline int get_bits_diff(MpegEncContext *s){
806  const int bits= put_bits_count(&s->pb);
807  const int last= s->last_bits;
808 
809  s->last_bits = bits;
810 
811  return bits - last;
812 }
813 
814 static inline int ff_h263_round_chroma(int x){
815  static const uint8_t h263_chroma_roundtab[16] = {
816  // 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
817  0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
818  };
819  return h263_chroma_roundtab[x & 0xf] + (x >> 3);
820 }
821 
822 /* motion_est.c */
823 void ff_estimate_p_frame_motion(MpegEncContext * s,
824  int mb_x, int mb_y);
825 void ff_estimate_b_frame_motion(MpegEncContext * s,
826  int mb_x, int mb_y);
827 int ff_get_best_fcode(MpegEncContext * s, int16_t (*mv_table)[2], int type);
828 void ff_fix_long_p_mvs(MpegEncContext * s);
829 void ff_fix_long_mvs(MpegEncContext * s, uint8_t *field_select_table, int field_select,
830  int16_t (*mv_table)[2], int f_code, int type, int truncate);
831 int ff_init_me(MpegEncContext *s);
832 int ff_pre_estimate_p_frame_motion(MpegEncContext * s, int mb_x, int mb_y);
833 int ff_epzs_motion_search(MpegEncContext * s, int *mx_ptr, int *my_ptr,
834  int P[10][2], int src_index, int ref_index, int16_t (*last_mv)[2],
835  int ref_mv_scale, int size, int h);
836 int ff_get_mb_score(MpegEncContext * s, int mx, int my, int src_index,
837  int ref_index, int size, int h, int add_rate);
838 
839 /* mpeg12.c */
840 extern const uint8_t ff_mpeg1_dc_scale_table[128];
841 extern const uint8_t * const ff_mpeg2_dc_scale_table[4];
842 
843 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number);
844 void ff_mpeg1_encode_mb(MpegEncContext *s,
845  int16_t block[6][64],
846  int motion_x, int motion_y);
847 void ff_mpeg1_encode_init(MpegEncContext *s);
848 void ff_mpeg1_encode_slice_header(MpegEncContext *s);
849 
850 extern const uint8_t ff_aic_dc_scale_table[32];
851 extern const uint8_t ff_h263_chroma_qscale_table[32];
852 
853 /* rv10.c */
854 void ff_rv10_encode_picture_header(MpegEncContext *s, int picture_number);
855 int ff_rv_decode_dc(MpegEncContext *s, int n);
856 void ff_rv20_encode_picture_header(MpegEncContext *s, int picture_number);
857 
858 
859 /* msmpeg4.c */
860 void ff_msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number);
861 void ff_msmpeg4_encode_ext_header(MpegEncContext * s);
862 void ff_msmpeg4_encode_mb(MpegEncContext * s,
863  int16_t block[6][64],
864  int motion_x, int motion_y);
865 int ff_msmpeg4_decode_picture_header(MpegEncContext * s);
866 int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size);
867 int ff_msmpeg4_decode_init(AVCodecContext *avctx);
868 void ff_msmpeg4_encode_init(MpegEncContext *s);
869 int ff_wmv2_decode_picture_header(MpegEncContext * s);
870 int ff_wmv2_decode_secondary_picture_header(MpegEncContext * s);
871 void ff_wmv2_add_mb(MpegEncContext *s, int16_t block[6][64], uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr);
872 void ff_mspel_motion(MpegEncContext *s,
873  uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
874  uint8_t **ref_picture, op_pixels_func (*pix_op)[4],
875  int motion_x, int motion_y, int h);
876 int ff_wmv2_encode_picture_header(MpegEncContext * s, int picture_number);
877 void ff_wmv2_encode_mb(MpegEncContext * s,
878  int16_t block[6][64],
879  int motion_x, int motion_y);
880 
881 int ff_mpeg_ref_picture(MpegEncContext *s, Picture *dst, Picture *src);
882 void ff_mpeg_unref_picture(MpegEncContext *s, Picture *picture);
883 void ff_free_picture_tables(Picture *pic);
884 
885 
886 #endif /* AVCODEC_MPEGVIDEO_H */
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