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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 "get_bits.h"
34 #include "put_bits.h"
35 #include "ratecontrol.h"
36 #include "parser.h"
37 #include "mpeg12data.h"
38 #include "rl.h"
39 #include "videodsp.h"
40 
41 #include "libavutil/opt.h"
42 #include "libavutil/timecode.h"
43 
44 #define FRAME_SKIPPED 100 ///< return value for header parsers if frame is not coded
45 
46 enum OutputFormat {
47  FMT_MPEG1,
48  FMT_H261,
49  FMT_H263,
50  FMT_MJPEG,
51  FMT_H264,
52 };
53 
54 #define MPEG_BUF_SIZE (16 * 1024)
55 
56 #define QMAT_SHIFT_MMX 16
57 #define QMAT_SHIFT 21
58 
59 #define MAX_FCODE 7
60 #define MAX_MV 2048
61 
62 #define MAX_THREADS 32
63 
64 #define MAX_PICTURE_COUNT 34
65 
66 #define ME_MAP_SIZE 64
67 #define ME_MAP_SHIFT 3
68 #define ME_MAP_MV_BITS 11
69 
70 #define MAX_MB_BYTES (30*16*16*3/8 + 120)
71 
72 #define INPLACE_OFFSET 16
73 
74 /* Start codes. */
75 #define SEQ_END_CODE 0x000001b7
76 #define SEQ_START_CODE 0x000001b3
77 #define GOP_START_CODE 0x000001b8
78 #define PICTURE_START_CODE 0x00000100
79 #define SLICE_MIN_START_CODE 0x00000101
80 #define SLICE_MAX_START_CODE 0x000001af
81 #define EXT_START_CODE 0x000001b5
82 #define USER_START_CODE 0x000001b2
83 
84 /**
85  * Value of Picture.reference when Picture is not a reference picture, but
86  * is held for delayed output.
87  */
88 #define DELAYED_PIC_REF 4
89 
90 struct MpegEncContext;
91 
92 /**
93  * Picture.
94  */
95 typedef struct Picture{
96  struct AVFrame f;
97 
98  /**
99  * halfpel luma planes.
100  */
101  uint8_t *interpolated[3];
102  int8_t *qscale_table_base;
103  int16_t (*motion_val_base[2])[2];
104  uint32_t *mb_type_base;
105 #define MB_TYPE_INTRA MB_TYPE_INTRA4x4 //default mb_type if there is just one type
106 #define IS_INTRA4x4(a) ((a)&MB_TYPE_INTRA4x4)
107 #define IS_INTRA16x16(a) ((a)&MB_TYPE_INTRA16x16)
108 #define IS_PCM(a) ((a)&MB_TYPE_INTRA_PCM)
109 #define IS_INTRA(a) ((a)&7)
110 #define IS_INTER(a) ((a)&(MB_TYPE_16x16|MB_TYPE_16x8|MB_TYPE_8x16|MB_TYPE_8x8))
111 #define IS_SKIP(a) ((a)&MB_TYPE_SKIP)
112 #define IS_INTRA_PCM(a) ((a)&MB_TYPE_INTRA_PCM)
113 #define IS_INTERLACED(a) ((a)&MB_TYPE_INTERLACED)
114 #define IS_DIRECT(a) ((a)&MB_TYPE_DIRECT2)
115 #define IS_GMC(a) ((a)&MB_TYPE_GMC)
116 #define IS_16X16(a) ((a)&MB_TYPE_16x16)
117 #define IS_16X8(a) ((a)&MB_TYPE_16x8)
118 #define IS_8X16(a) ((a)&MB_TYPE_8x16)
119 #define IS_8X8(a) ((a)&MB_TYPE_8x8)
120 #define IS_SUB_8X8(a) ((a)&MB_TYPE_16x16) //note reused
121 #define IS_SUB_8X4(a) ((a)&MB_TYPE_16x8) //note reused
122 #define IS_SUB_4X8(a) ((a)&MB_TYPE_8x16) //note reused
123 #define IS_SUB_4X4(a) ((a)&MB_TYPE_8x8) //note reused
124 #define IS_ACPRED(a) ((a)&MB_TYPE_ACPRED)
125 #define IS_QUANT(a) ((a)&MB_TYPE_QUANT)
126 #define IS_DIR(a, part, list) ((a) & (MB_TYPE_P0L0<<((part)+2*(list))))
127 #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
128 #define HAS_CBP(a) ((a)&MB_TYPE_CBP)
129 
130  int field_poc[2]; ///< h264 top/bottom POC
131  int poc; ///< h264 frame POC
132  int frame_num; ///< h264 frame_num (raw frame_num from slice header)
133  int mmco_reset; ///< h264 MMCO_RESET set this 1. Reordering code must not mix pictures before and after MMCO_RESET.
134  int pic_id; /**< h264 pic_num (short -> no wrap version of pic_num,
135  pic_num & max_pic_num; long -> long_pic_num) */
136  int long_ref; ///< 1->long term reference 0->short term reference
137  int ref_poc[2][2][32]; ///< h264 POCs of the frames/fields used as reference (FIXME need per slice)
138  int ref_count[2][2]; ///< number of entries in ref_poc (FIXME need per slice)
139  int mbaff; ///< h264 1 -> MBAFF frame 0-> not MBAFF
140  int field_picture; ///< whether or not the picture was encoded in separate fields
141  int sync; ///< has been decoded after a keyframe
142 
143  int mb_var_sum; ///< sum of MB variance for current frame
144  int mc_mb_var_sum; ///< motion compensated MB variance for current frame
145  uint16_t *mb_var; ///< Table for MB variances
146  uint16_t *mc_mb_var; ///< Table for motion compensated MB variances
147  uint8_t *mb_mean; ///< Table for MB luminance
148  int32_t *mb_cmp_score; ///< Table for MB cmp scores, for mb decision FIXME remove
149  int b_frame_score; /* */
150  struct MpegEncContext *owner2; ///< pointer to the MpegEncContext that allocated this picture
151  int needs_realloc; ///< Picture needs to be reallocated (eg due to a frame size change)
152 } Picture;
153 
154 /**
155  * Motion estimation context.
156  */
157 typedef struct MotionEstContext{
158  AVCodecContext *avctx;
159  int skip; ///< set if ME is skipped for the current MB
160  int co_located_mv[4][2]; ///< mv from last P-frame for direct mode ME
161  int direct_basis_mv[4][2];
162  uint8_t *scratchpad; ///< data area for the ME algo, so that the ME does not need to malloc/free
163  uint8_t *best_mb;
164  uint8_t *temp_mb[2];
165  uint8_t *temp;
166  int best_bits;
167  uint32_t *map; ///< map to avoid duplicate evaluations
168  uint32_t *score_map; ///< map to store the scores
169  unsigned map_generation;
170  int pre_penalty_factor;
171  int penalty_factor; /**< an estimate of the bits required to
172  code a given mv value, e.g. (1,0) takes
173  more bits than (0,0). We have to
174  estimate whether any reduction in
175  residual is worth the extra bits. */
176  int sub_penalty_factor;
177  int mb_penalty_factor;
178  int flags;
179  int sub_flags;
180  int mb_flags;
181  int pre_pass; ///< = 1 for the pre pass
182  int dia_size;
183  int xmin;
184  int xmax;
185  int ymin;
186  int ymax;
187  int pred_x;
188  int pred_y;
189  uint8_t *src[4][4];
190  uint8_t *ref[4][4];
191  int stride;
192  int uvstride;
193  /* temp variables for picture complexity calculation */
194  int mc_mb_var_sum_temp;
195  int mb_var_sum_temp;
196  int scene_change_score;
197 /* cmp, chroma_cmp;*/
198  op_pixels_func (*hpel_put)[4];
199  op_pixels_func (*hpel_avg)[4];
200  qpel_mc_func (*qpel_put)[16];
201  qpel_mc_func (*qpel_avg)[16];
202  uint8_t (*mv_penalty)[MAX_MV*2+1]; ///< amount of bits needed to encode a MV
203  uint8_t *current_mv_penalty;
204  int (*sub_motion_search)(struct MpegEncContext * s,
205  int *mx_ptr, int *my_ptr, int dmin,
206  int src_index, int ref_index,
207  int size, int h);
208 }MotionEstContext;
209 
210 /**
211  * MpegEncContext.
212  */
213 typedef struct MpegEncContext {
214  AVClass *class;
215  struct AVCodecContext *avctx;
216  /* the following parameters must be initialized before encoding */
217  int width, height;///< picture size. must be a multiple of 16
218  int gop_size;
219  int intra_only; ///< if true, only intra pictures are generated
220  int bit_rate; ///< wanted bit rate
221  enum OutputFormat out_format; ///< output format
222  int h263_pred; ///< use mpeg4/h263 ac/dc predictions
223  int pb_frame; ///< PB frame mode (0 = none, 1 = base, 2 = improved)
224 
225 /* the following codec id fields are deprecated in favor of codec_id */
226  int h263_plus; ///< h263 plus headers
227  int h263_flv; ///< use flv h263 header
228 
229  enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
230  int fixed_qscale; ///< fixed qscale if non zero
231  int encoding; ///< true if we are encoding (vs decoding)
232  int flags; ///< AVCodecContext.flags (HQ, MV4, ...)
233  int flags2; ///< AVCodecContext.flags2
234  int max_b_frames; ///< max number of b-frames for encoding
235  int luma_elim_threshold;
236  int chroma_elim_threshold;
237  int strict_std_compliance; ///< strictly follow the std (MPEG4, ...)
238  int workaround_bugs; ///< workaround bugs in encoders which cannot be detected automatically
239  int codec_tag; ///< internal codec_tag upper case converted from avctx codec_tag
240  int stream_codec_tag; ///< internal stream_codec_tag upper case converted from avctx stream_codec_tag
241  /* the following fields are managed internally by the encoder */
242 
243  /* sequence parameters */
244  int context_initialized;
245  int input_picture_number; ///< used to set pic->display_picture_number, should not be used for/by anything else
246  int coded_picture_number; ///< used to set pic->coded_picture_number, should not be used for/by anything else
247  int picture_number; //FIXME remove, unclear definition
248  int picture_in_gop_number; ///< 0-> first pic in gop, ...
249  int mb_width, mb_height; ///< number of MBs horizontally & vertically
250  int mb_stride; ///< mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11
251  int b8_stride; ///< 2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
252  int b4_stride; ///< 4*mb_width+1 used for some 4x4 block arrays to allow simple addressing
253  int h_edge_pos, v_edge_pos;///< horizontal / vertical position of the right/bottom edge (pixel replication)
254  int mb_num; ///< number of MBs of a picture
255  int linesize; ///< line size, in bytes, may be different from width
256  int uvlinesize; ///< line size, for chroma in bytes, may be different from width
257  Picture *picture; ///< main picture buffer
258  Picture **input_picture; ///< next pictures on display order for encoding
259  Picture **reordered_input_picture; ///< pointer to the next pictures in codedorder for encoding
260 
261  int y_dc_scale, c_dc_scale;
262  int ac_pred;
263  int block_last_index[12]; ///< last non zero coefficient in block
264  int h263_aic; ///< Advanded INTRA Coding (AIC)
265 
266  /* scantables */
267  ScanTable inter_scantable; ///< if inter == intra then intra should be used to reduce tha cache usage
268  ScanTable intra_scantable;
269  ScanTable intra_h_scantable;
270  ScanTable intra_v_scantable;
271 
272  /* WARNING: changes above this line require updates to hardcoded
273  * offsets used in asm. */
274 
275  int64_t user_specified_pts;///< last non zero pts from AVFrame which was passed into avcodec_encode_video()
276  /**
277  * pts difference between the first and second input frame, used for
278  * calculating dts of the first frame when there's a delay */
279  int64_t dts_delta;
280  /**
281  * reordered pts to be used as dts for the next output frame when there's
282  * a delay */
283  int64_t reordered_pts;
284 
285  /** bit output */
286  PutBitContext pb;
287 
288  int start_mb_y; ///< start mb_y of this thread (so current thread should process start_mb_y <= row < end_mb_y)
289  int end_mb_y; ///< end mb_y of this thread (so current thread should process start_mb_y <= row < end_mb_y)
290  struct MpegEncContext *thread_context[MAX_THREADS];
291  int slice_context_count; ///< number of used thread_contexts
292 
293  /**
294  * copy of the previous picture structure.
295  * note, linesize & data, might not match the previous picture (for field pictures)
296  */
297  Picture last_picture;
298 
299  /**
300  * copy of the next picture structure.
301  * note, linesize & data, might not match the next picture (for field pictures)
302  */
303  Picture next_picture;
304 
305  /**
306  * copy of the source picture structure for encoding.
307  * note, linesize & data, might not match the source picture (for field pictures)
308  */
309  Picture new_picture;
310 
311  /**
312  * copy of the current picture structure.
313  * note, linesize & data, might not match the current picture (for field pictures)
314  */
315  Picture current_picture; ///< buffer to store the decompressed current picture
316 
317  Picture *last_picture_ptr; ///< pointer to the previous picture.
318  Picture *next_picture_ptr; ///< pointer to the next picture (for bidir pred)
319  Picture *current_picture_ptr; ///< pointer to the current picture
320  int picture_count; ///< number of allocated pictures (MAX_PICTURE_COUNT * avctx->thread_count)
321  int picture_range_start, picture_range_end; ///< the part of picture that this context can allocate in
322  uint8_t *visualization_buffer[3]; ///< temporary buffer vor MV visualization
323  int last_dc[3]; ///< last DC values for MPEG1
324  int16_t *dc_val_base;
325  int16_t *dc_val[3]; ///< used for mpeg4 DC prediction, all 3 arrays must be continuous
326  const uint8_t *y_dc_scale_table; ///< qscale -> y_dc_scale table
327  const uint8_t *c_dc_scale_table; ///< qscale -> c_dc_scale table
328  const uint8_t *chroma_qscale_table; ///< qscale -> chroma_qscale (h263)
329  uint8_t *coded_block_base;
330  uint8_t *coded_block; ///< used for coded block pattern prediction (msmpeg4v3, wmv1)
331  int16_t (*ac_val_base)[16];
332  int16_t (*ac_val[3])[16]; ///< used for for mpeg4 AC prediction, all 3 arrays must be continuous
333  int mb_skipped; ///< MUST BE SET only during DECODING
334  uint8_t *mbskip_table; /**< used to avoid copy if macroblock skipped (for black regions for example)
335  and used for b-frame encoding & decoding (contains skip table of next P Frame) */
336  uint8_t *mbintra_table; ///< used to avoid setting {ac, dc, cbp}-pred stuff to zero on inter MB decoding
337  uint8_t *cbp_table; ///< used to store cbp, ac_pred for partitioned decoding
338  uint8_t *pred_dir_table; ///< used to store pred_dir for partitioned decoding
339  uint8_t *edge_emu_buffer; ///< temporary buffer for if MVs point to out-of-frame data
340  uint8_t *rd_scratchpad; ///< scratchpad for rate distortion mb decision
341  uint8_t *obmc_scratchpad;
342  uint8_t *b_scratchpad; ///< scratchpad used for writing into write only buffers
343 
344  int qscale; ///< QP
345  int chroma_qscale; ///< chroma QP
346  unsigned int lambda; ///< lagrange multipler used in rate distortion
347  unsigned int lambda2; ///< (lambda*lambda) >> FF_LAMBDA_SHIFT
348  int *lambda_table;
349  int adaptive_quant; ///< use adaptive quantization
350  int dquant; ///< qscale difference to prev qscale
351  int closed_gop; ///< MPEG1/2 GOP is closed
352  int pict_type; ///< AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
353  int vbv_delay;
354  int last_pict_type; //FIXME removes
355  int last_non_b_pict_type; ///< used for mpeg4 gmc b-frames & ratecontrol
356  int droppable;
357  int frame_rate_index;
358  AVRational mpeg2_frame_rate_ext;
359  int last_lambda_for[5]; ///< last lambda for a specific pict type
360  int skipdct; ///< skip dct and code zero residual
361 
362  /* motion compensation */
363  int unrestricted_mv; ///< mv can point outside of the coded picture
364  int h263_long_vectors; ///< use horrible h263v1 long vector mode
365 
366  DSPContext dsp; ///< pointers for accelerated dsp functions
367  VideoDSPContext vdsp;
368  int f_code; ///< forward MV resolution
369  int b_code; ///< backward MV resolution for B Frames (mpeg4)
370  int16_t (*p_mv_table_base)[2];
371  int16_t (*b_forw_mv_table_base)[2];
372  int16_t (*b_back_mv_table_base)[2];
373  int16_t (*b_bidir_forw_mv_table_base)[2];
374  int16_t (*b_bidir_back_mv_table_base)[2];
375  int16_t (*b_direct_mv_table_base)[2];
376  int16_t (*p_field_mv_table_base[2][2])[2];
377  int16_t (*b_field_mv_table_base[2][2][2])[2];
378  int16_t (*p_mv_table)[2]; ///< MV table (1MV per MB) p-frame encoding
379  int16_t (*b_forw_mv_table)[2]; ///< MV table (1MV per MB) forward mode b-frame encoding
380  int16_t (*b_back_mv_table)[2]; ///< MV table (1MV per MB) backward mode b-frame encoding
381  int16_t (*b_bidir_forw_mv_table)[2]; ///< MV table (1MV per MB) bidir mode b-frame encoding
382  int16_t (*b_bidir_back_mv_table)[2]; ///< MV table (1MV per MB) bidir mode b-frame encoding
383  int16_t (*b_direct_mv_table)[2]; ///< MV table (1MV per MB) direct mode b-frame encoding
384  int16_t (*p_field_mv_table[2][2])[2]; ///< MV table (2MV per MB) interlaced p-frame encoding
385  int16_t (*b_field_mv_table[2][2][2])[2];///< MV table (4MV per MB) interlaced b-frame encoding
386  uint8_t (*p_field_select_table[2]);
387  uint8_t (*b_field_select_table[2][2]);
388  int me_method; ///< ME algorithm
389  int mv_dir;
390 #define MV_DIR_FORWARD 1
391 #define MV_DIR_BACKWARD 2
392 #define MV_DIRECT 4 ///< bidirectional mode where the difference equals the MV of the last P/S/I-Frame (mpeg4)
393  int mv_type;
394 #define MV_TYPE_16X16 0 ///< 1 vector for the whole mb
395 #define MV_TYPE_8X8 1 ///< 4 vectors (h263, mpeg4 4MV)
396 #define MV_TYPE_16X8 2 ///< 2 vectors, one per 16x8 block
397 #define MV_TYPE_FIELD 3 ///< 2 vectors, one per field
398 #define MV_TYPE_DMV 4 ///< 2 vectors, special mpeg2 Dual Prime Vectors
399  /**motion vectors for a macroblock
400  first coordinate : 0 = forward 1 = backward
401  second " : depend on type
402  third " : 0 = x, 1 = y
403  */
404  int mv[2][4][2];
405  int field_select[2][2];
406  int last_mv[2][2][2]; ///< last MV, used for MV prediction in MPEG1 & B-frame MPEG4
407  uint8_t *fcode_tab; ///< smallest fcode needed for each MV
408  int16_t direct_scale_mv[2][64]; ///< precomputed to avoid divisions in ff_mpeg4_set_direct_mv
409 
410  MotionEstContext me;
411 
412  int no_rounding; /**< apply no rounding to motion compensation (MPEG4, msmpeg4, ...)
413  for b-frames rounding mode is always 0 */
414 
415  /* macroblock layer */
416  int mb_x, mb_y;
417  int mb_skip_run;
418  int mb_intra;
419  uint16_t *mb_type; ///< Table for candidate MB types for encoding
420 #define CANDIDATE_MB_TYPE_INTRA 0x01
421 #define CANDIDATE_MB_TYPE_INTER 0x02
422 #define CANDIDATE_MB_TYPE_INTER4V 0x04
423 #define CANDIDATE_MB_TYPE_SKIPPED 0x08
424 //#define MB_TYPE_GMC 0x10
425 
426 #define CANDIDATE_MB_TYPE_DIRECT 0x10
427 #define CANDIDATE_MB_TYPE_FORWARD 0x20
428 #define CANDIDATE_MB_TYPE_BACKWARD 0x40
429 #define CANDIDATE_MB_TYPE_BIDIR 0x80
430 
431 #define CANDIDATE_MB_TYPE_INTER_I 0x100
432 #define CANDIDATE_MB_TYPE_FORWARD_I 0x200
433 #define CANDIDATE_MB_TYPE_BACKWARD_I 0x400
434 #define CANDIDATE_MB_TYPE_BIDIR_I 0x800
435 
436 #define CANDIDATE_MB_TYPE_DIRECT0 0x1000
437 
438  int block_index[6]; ///< index to current MB in block based arrays with edges
439  int block_wrap[6];
440  uint8_t *dest[3];
441 
442  int *mb_index2xy; ///< mb_index -> mb_x + mb_y*mb_stride
443 
444  /** matrix transmitted in the bitstream */
445  uint16_t intra_matrix[64];
446  uint16_t chroma_intra_matrix[64];
447  uint16_t inter_matrix[64];
448  uint16_t chroma_inter_matrix[64];
449 #define QUANT_BIAS_SHIFT 8
450  int intra_quant_bias; ///< bias for the quantizer
451  int inter_quant_bias; ///< bias for the quantizer
452  int min_qcoeff; ///< minimum encodable coefficient
453  int max_qcoeff; ///< maximum encodable coefficient
454  int ac_esc_length; ///< num of bits needed to encode the longest esc
455  uint8_t *intra_ac_vlc_length;
456  uint8_t *intra_ac_vlc_last_length;
457  uint8_t *inter_ac_vlc_length;
458  uint8_t *inter_ac_vlc_last_length;
459  uint8_t *luma_dc_vlc_length;
460 #define UNI_AC_ENC_INDEX(run,level) ((run)*128 + (level))
461 
462  int coded_score[12];
463 
464  /** precomputed matrix (combine qscale and DCT renorm) */
465  int (*q_intra_matrix)[64];
466  int (*q_chroma_intra_matrix)[64];
467  int (*q_inter_matrix)[64];
468  /** identical to the above but for MMX & these are not permutated, second 64 entries are bias*/
469  uint16_t (*q_intra_matrix16)[2][64];
470  uint16_t (*q_chroma_intra_matrix16)[2][64];
471  uint16_t (*q_inter_matrix16)[2][64];
472 
473  /* noise reduction */
474  int (*dct_error_sum)[64];
475  int dct_count[2];
476  uint16_t (*dct_offset)[64];
477 
478  void *opaque; ///< private data for the user
479 
480  /* bit rate control */
481  int64_t total_bits;
482  int frame_bits; ///< bits used for the current frame
483  int stuffing_bits; ///< bits used for stuffing
484  int next_lambda; ///< next lambda used for retrying to encode a frame
485  RateControlContext rc_context; ///< contains stuff only accessed in ratecontrol.c
486 
487  /* statistics, used for 2-pass encoding */
488  int mv_bits;
489  int header_bits;
490  int i_tex_bits;
491  int p_tex_bits;
492  int i_count;
493  int f_count;
494  int b_count;
495  int skip_count;
496  int misc_bits; ///< cbp, mb_type
497  int last_bits; ///< temp var used for calculating the above vars
498 
499  /* error concealment / resync */
500  int error_count, error_occurred;
501  uint8_t *error_status_table; ///< table of the error status of each MB
502 #define VP_START 1 ///< current MB is the first after a resync marker
503 #define ER_AC_ERROR 2
504 #define ER_DC_ERROR 4
505 #define ER_MV_ERROR 8
506 #define ER_AC_END 16
507 #define ER_DC_END 32
508 #define ER_MV_END 64
509 
510 #define ER_MB_ERROR (ER_AC_ERROR|ER_DC_ERROR|ER_MV_ERROR)
511 #define ER_MB_END (ER_AC_END|ER_DC_END|ER_MV_END)
512 
513  int resync_mb_x; ///< x position of last resync marker
514  int resync_mb_y; ///< y position of last resync marker
515  GetBitContext last_resync_gb; ///< used to search for the next resync marker
516  int mb_num_left; ///< number of MBs left in this video packet (for partitioned Slices only)
517  int next_p_frame_damaged; ///< set if the next p frame is damaged, to avoid showing trashed b frames
518  int err_recognition;
519 
520  ParseContext parse_context;
521 
522  /* H.263 specific */
523  int gob_index;
524  int obmc; ///< overlapped block motion compensation
525  int showed_packed_warning; ///< flag for having shown the warning about divxs invalid b frames
526  int mb_info; ///< interval for outputting info about mb offsets as side data
527  int prev_mb_info, last_mb_info;
528  uint8_t *mb_info_ptr;
529  int mb_info_size;
530 
531  /* H.263+ specific */
532  int umvplus; ///< == H263+ && unrestricted_mv
533  int h263_aic_dir; ///< AIC direction: 0 = left, 1 = top
534  int h263_slice_structured;
535  int alt_inter_vlc; ///< alternative inter vlc
536  int modified_quant;
537  int loop_filter;
538  int custom_pcf;
539 
540  /* mpeg4 specific */
541  int time_increment_bits; ///< number of bits to represent the fractional part of time
542  int last_time_base;
543  int time_base; ///< time in seconds of last I,P,S Frame
544  int64_t time; ///< time of current frame
545  int64_t last_non_b_time;
546  uint16_t pp_time; ///< time distance between the last 2 p,s,i frames
547  uint16_t pb_time; ///< time distance between the last b and p,s,i frame
548  uint16_t pp_field_time;
549  uint16_t pb_field_time; ///< like above, just for interlaced
550  int shape;
551  int vol_sprite_usage;
552  int sprite_width;
553  int sprite_height;
554  int sprite_left;
555  int sprite_top;
556  int sprite_brightness_change;
557  int num_sprite_warping_points;
558  int real_sprite_warping_points;
559  uint16_t sprite_traj[4][2]; ///< sprite trajectory points
560  int sprite_offset[2][2]; ///< sprite offset[isChroma][isMVY]
561  int sprite_delta[2][2]; ///< sprite_delta [isY][isMVY]
562  int sprite_shift[2]; ///< sprite shift [isChroma]
563  int mcsel;
564  int quant_precision;
565  int quarter_sample; ///< 1->qpel, 0->half pel ME/MC
566  int scalability;
567  int hierachy_type;
568  int enhancement_type;
569  int new_pred;
570  int reduced_res_vop;
571  int aspect_ratio_info; //FIXME remove
572  int sprite_warping_accuracy;
573  int low_latency_sprite;
574  int data_partitioning; ///< data partitioning flag from header
575  int partitioned_frame; ///< is current frame partitioned
576  int rvlc; ///< reversible vlc
577  int resync_marker; ///< could this stream contain resync markers
578  int low_delay; ///< no reordering needed / has no b-frames
579  int vo_type;
580  int vol_control_parameters; ///< does the stream contain the low_delay flag, used to workaround buggy encoders
581  int intra_dc_threshold; ///< QP above whch the ac VLC should be used for intra dc
582  int use_intra_dc_vlc;
583  PutBitContext tex_pb; ///< used for data partitioned VOPs
584  PutBitContext pb2; ///< used for data partitioned VOPs
585  int mpeg_quant;
586  int t_frame; ///< time distance of first I -> B, used for interlaced b frames
587  int padding_bug_score; ///< used to detect the VERY common padding bug in MPEG4
588  int cplx_estimation_trash_i;
589  int cplx_estimation_trash_p;
590  int cplx_estimation_trash_b;
591 
592  /* divx specific, used to workaround (many) bugs in divx5 */
593  int divx_version;
594  int divx_build;
595  int divx_packed;
596  uint8_t *bitstream_buffer; //Divx 5.01 puts several frames in a single one, this is used to reorder them
597  int bitstream_buffer_size;
598  unsigned int allocated_bitstream_buffer_size;
599 
600  int xvid_build;
601 
602  /* lavc specific stuff, used to workaround bugs in libavcodec */
603  int lavc_build;
604 
605  /* RV10 specific */
606  int rv10_version; ///< RV10 version: 0 or 3
607  int rv10_first_dc_coded[3];
608  int orig_width, orig_height;
609 
610  /* MJPEG specific */
611  struct MJpegContext *mjpeg_ctx;
612  int mjpeg_vsample[3]; ///< vertical sampling factors, default = {2, 1, 1}
613  int mjpeg_hsample[3]; ///< horizontal sampling factors, default = {2, 1, 1}
614  int esc_pos;
615 
616  /* MSMPEG4 specific */
617  int mv_table_index;
618  int rl_table_index;
619  int rl_chroma_table_index;
620  int dc_table_index;
621  int use_skip_mb_code;
622  int slice_height; ///< in macroblocks
623  int first_slice_line; ///< used in mpeg4 too to handle resync markers
624  int flipflop_rounding;
625  int msmpeg4_version; ///< 0=not msmpeg4, 1=mp41, 2=mp42, 3=mp43/divx3 4=wmv1/7 5=wmv2/8
626  int per_mb_rl_table;
627  int esc3_level_length;
628  int esc3_run_length;
629  /** [mb_intra][isChroma][level][run][last] */
630  int (*ac_stats)[2][MAX_LEVEL+1][MAX_RUN+1][2];
631  int inter_intra_pred;
632  int mspel;
633 
634  /* decompression specific */
635  GetBitContext gb;
636 
637  /* Mpeg1 specific */
638  int gop_picture_number; ///< index of the first picture of a GOP based on fake_pic_num & mpeg1 specific
639  int last_mv_dir; ///< last mv_dir, used for b frame encoding
640  int broken_link; ///< no_output_of_prior_pics_flag
641  uint8_t *vbv_delay_ptr; ///< pointer to vbv_delay in the bitstream
642 
643  /* MPEG-2-specific - I wished not to have to support this mess. */
644  int progressive_sequence;
645  int mpeg_f_code[2][2];
646  int picture_structure;
647 /* picture type */
648 #define PICT_TOP_FIELD 1
649 #define PICT_BOTTOM_FIELD 2
650 #define PICT_FRAME 3
651 
652  int intra_dc_precision;
653  int frame_pred_frame_dct;
654  int top_field_first;
655  int concealment_motion_vectors;
656  int q_scale_type;
657  int intra_vlc_format;
658  int alternate_scan;
659  int repeat_first_field;
660  int chroma_420_type;
661  int chroma_format;
662 #define CHROMA_420 1
663 #define CHROMA_422 2
664 #define CHROMA_444 3
665  int chroma_x_shift;//depend on pix_format, that depend on chroma_format
666  int chroma_y_shift;
667 
668  int progressive_frame;
669  int full_pel[2];
670  int interlaced_dct;
671  int first_slice;
672  int first_field; ///< is 1 for the first field of a field picture 0 otherwise
673  int drop_frame_timecode; ///< timecode is in drop frame format.
674  int scan_offset; ///< reserve space for SVCD scan offset user data.
675 
676  /* RTP specific */
677  int rtp_mode;
678 
679  char *tc_opt_str; ///< timecode option string
680  AVTimecode tc; ///< timecode context
681 
682  uint8_t *ptr_lastgob;
683  int swap_uv; //vcr2 codec is an MPEG-2 variant with U and V swapped
684  DCTELEM (*pblocks[12])[64];
685 
686  DCTELEM (*block)[64]; ///< points to one of the following blocks
687  DCTELEM (*blocks)[12][64]; // for HQ mode we need to keep the best block
688  int (*decode_mb)(struct MpegEncContext *s, DCTELEM block[6][64]); // used by some codecs to avoid a switch()
689 #define SLICE_OK 0
690 #define SLICE_ERROR -1
691 #define SLICE_END -2 ///<end marker found
692 #define SLICE_NOEND -3 ///<no end marker or error found but mb count exceeded
693 
694  void (*dct_unquantize_mpeg1_intra)(struct MpegEncContext *s,
695  DCTELEM *block/*align 16*/, int n, int qscale);
696  void (*dct_unquantize_mpeg1_inter)(struct MpegEncContext *s,
697  DCTELEM *block/*align 16*/, int n, int qscale);
698  void (*dct_unquantize_mpeg2_intra)(struct MpegEncContext *s,
699  DCTELEM *block/*align 16*/, int n, int qscale);
700  void (*dct_unquantize_mpeg2_inter)(struct MpegEncContext *s,
701  DCTELEM *block/*align 16*/, int n, int qscale);
702  void (*dct_unquantize_h263_intra)(struct MpegEncContext *s,
703  DCTELEM *block/*align 16*/, int n, int qscale);
704  void (*dct_unquantize_h263_inter)(struct MpegEncContext *s,
705  DCTELEM *block/*align 16*/, int n, int qscale);
706  void (*dct_unquantize_h261_intra)(struct MpegEncContext *s,
707  DCTELEM *block/*align 16*/, int n, int qscale);
708  void (*dct_unquantize_h261_inter)(struct MpegEncContext *s,
709  DCTELEM *block/*align 16*/, int n, int qscale);
710  void (*dct_unquantize_intra)(struct MpegEncContext *s, // unquantizer to use (mpeg4 can use both)
711  DCTELEM *block/*align 16*/, int n, int qscale);
712  void (*dct_unquantize_inter)(struct MpegEncContext *s, // unquantizer to use (mpeg4 can use both)
713  DCTELEM *block/*align 16*/, int n, int qscale);
714  int (*dct_quantize)(struct MpegEncContext *s, DCTELEM *block/*align 16*/, int n, int qscale, int *overflow);
715  int (*fast_dct_quantize)(struct MpegEncContext *s, DCTELEM *block/*align 16*/, int n, int qscale, int *overflow);
716  void (*denoise_dct)(struct MpegEncContext *s, DCTELEM *block);
717 
718  int mpv_flags; ///< flags set by private options
719  int quantizer_noise_shaping;
720 
721  /* error resilience stuff */
722  uint8_t *er_temp_buffer;
723 
724  /* temp buffers for rate control */
725  float *cplx_tab, *bits_tab;
726 
727  /* flag to indicate a reinitialization is required, e.g. after
728  * a frame size change */
729  int context_reinit;
730 } MpegEncContext;
731 
732 #define REBASE_PICTURE(pic, new_ctx, old_ctx) (pic ? \
733  (pic >= old_ctx->picture && pic < old_ctx->picture+old_ctx->picture_count ?\
734  &new_ctx->picture[pic - old_ctx->picture] : (Picture*) ((uint8_t*)pic - (uint8_t*)old_ctx + (uint8_t*)new_ctx))\
735  : NULL)
736 
737 /* mpegvideo_enc common options */
738 #define FF_MPV_FLAG_SKIP_RD 0x0001
739 #define FF_MPV_FLAG_STRICT_GOP 0x0002
740 #define FF_MPV_FLAG_QP_RD 0x0004
741 #define FF_MPV_FLAG_CBP_RD 0x0008
742 
743 #define FF_MPV_OFFSET(x) offsetof(MpegEncContext, x)
744 #define FF_MPV_OPT_FLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
745 #define FF_MPV_COMMON_OPTS \
746 { "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" },\
747 { "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" },\
748 { "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" },\
749 { "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" },\
750 { "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" },\
751 { "luma_elim_threshold", "single coefficient elimination threshold for luminance (negative values also consider dc coefficient)",\
752  FF_MPV_OFFSET(luma_elim_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FF_MPV_OPT_FLAGS },\
753 { "chroma_elim_threshold", "single coefficient elimination threshold for chrominance (negative values also consider dc coefficient)",\
754  FF_MPV_OFFSET(chroma_elim_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FF_MPV_OPT_FLAGS },\
755 { "quantizer_noise_shaping", NULL, FF_MPV_OFFSET(quantizer_noise_shaping), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FF_MPV_OPT_FLAGS },
756 
757 extern const AVOption ff_mpv_generic_options[];
758 
759 #define FF_MPV_GENERIC_CLASS(name) \
760 static const AVClass name ## _class = {\
761  .class_name = #name " encoder",\
762  .item_name = av_default_item_name,\
763  .option = ff_mpv_generic_options,\
764  .version = LIBAVUTIL_VERSION_INT,\
765 };
766 
767 /**
768  * Set the given MpegEncContext to common defaults (same for encoding
769  * and decoding). The changed fields will not depend upon the prior
770  * state of the MpegEncContext.
771  */
772 void ff_MPV_common_defaults(MpegEncContext *s);
773 
774 void ff_MPV_decode_defaults(MpegEncContext *s);
775 int ff_MPV_common_init(MpegEncContext *s);
776 int ff_mpv_frame_size_alloc(MpegEncContext *s, int linesize);
777 int ff_MPV_common_frame_size_change(MpegEncContext *s);
778 void ff_MPV_common_end(MpegEncContext *s);
779 void ff_MPV_decode_mb(MpegEncContext *s, DCTELEM block[12][64]);
780 int ff_MPV_frame_start(MpegEncContext *s, AVCodecContext *avctx);
781 void ff_MPV_frame_end(MpegEncContext *s);
782 int ff_MPV_encode_init(AVCodecContext *avctx);
783 int ff_MPV_encode_end(AVCodecContext *avctx);
784 int ff_MPV_encode_picture(AVCodecContext *avctx, AVPacket *pkt,
785  AVFrame *frame, int *got_packet);
786 void ff_dct_encode_init_x86(MpegEncContext *s);
787 void ff_MPV_common_init_x86(MpegEncContext *s);
788 void ff_MPV_common_init_axp(MpegEncContext *s);
789 void ff_MPV_common_init_arm(MpegEncContext *s);
790 void ff_MPV_common_init_altivec(MpegEncContext *s);
791 void ff_MPV_common_init_bfin(MpegEncContext *s);
792 void ff_clean_intra_table_entries(MpegEncContext *s);
793 void ff_draw_horiz_band(MpegEncContext *s, int y, int h);
794 void ff_mpeg_flush(AVCodecContext *avctx);
795 void ff_print_debug_info(MpegEncContext *s, AVFrame *pict);
796 void ff_write_quant_matrix(PutBitContext *pb, uint16_t *matrix);
797 void ff_release_unused_pictures(MpegEncContext *s, int remove_current);
798 int ff_find_unused_picture(MpegEncContext *s, int shared);
799 void ff_denoise_dct(MpegEncContext *s, DCTELEM *block);
800 int ff_update_duplicate_context(MpegEncContext *dst, MpegEncContext *src);
801 int ff_MPV_lowest_referenced_row(MpegEncContext *s, int dir);
802 void ff_MPV_report_decode_progress(MpegEncContext *s);
803 int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src);
804 const uint8_t *avpriv_mpv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state);
805 void ff_set_qscale(MpegEncContext * s, int qscale);
806 
807 void ff_er_frame_start(MpegEncContext *s);
808 void ff_er_frame_end(MpegEncContext *s);
809 void ff_er_add_slice(MpegEncContext *s, int startx, int starty, int endx, int endy, int status);
810 
811 int ff_dct_common_init(MpegEncContext *s);
812 int ff_dct_encode_init(MpegEncContext *s);
813 void ff_convert_matrix(DSPContext *dsp, int (*qmat)[64], uint16_t (*qmat16)[2][64],
814  const uint16_t *quant_matrix, int bias, int qmin, int qmax, int intra);
815 int ff_dct_quantize_c(MpegEncContext *s, DCTELEM *block, int n, int qscale, int *overflow);
816 
817 void ff_init_block_index(MpegEncContext *s);
818 void ff_copy_picture(Picture *dst, Picture *src);
819 
820 void ff_MPV_motion(MpegEncContext *s,
821  uint8_t *dest_y, uint8_t *dest_cb,
822  uint8_t *dest_cr, int dir,
823  uint8_t **ref_picture,
824  op_pixels_func (*pix_op)[4],
825  qpel_mc_func (*qpix_op)[16]);
826 
827 /**
828  * Allocate a Picture.
829  * The pixels are allocated/set by calling get_buffer() if shared = 0.
830  */
831 int ff_alloc_picture(MpegEncContext *s, Picture *pic, int shared);
832 
833 extern const enum AVPixelFormat ff_pixfmt_list_420[];
834 extern const enum AVPixelFormat ff_hwaccel_pixfmt_list_420[];
835 
836 static inline void ff_update_block_index(MpegEncContext *s){
837  const int block_size= 8 >> s->avctx->lowres;
838 
839  s->block_index[0]+=2;
840  s->block_index[1]+=2;
841  s->block_index[2]+=2;
842  s->block_index[3]+=2;
843  s->block_index[4]++;
844  s->block_index[5]++;
845  s->dest[0]+= 2*block_size;
846  s->dest[1]+= block_size;
847  s->dest[2]+= block_size;
848 }
849 
850 static inline int get_bits_diff(MpegEncContext *s){
851  const int bits= put_bits_count(&s->pb);
852  const int last= s->last_bits;
853 
854  s->last_bits = bits;
855 
856  return bits - last;
857 }
858 
859 static inline int ff_h263_round_chroma(int x){
860  static const uint8_t h263_chroma_roundtab[16] = {
861  // 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
862  0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
863  };
864  return h263_chroma_roundtab[x & 0xf] + (x >> 3);
865 }
866 
867 /* motion_est.c */
868 void ff_estimate_p_frame_motion(MpegEncContext * s,
869  int mb_x, int mb_y);
870 void ff_estimate_b_frame_motion(MpegEncContext * s,
871  int mb_x, int mb_y);
872 int ff_get_best_fcode(MpegEncContext * s, int16_t (*mv_table)[2], int type);
873 void ff_fix_long_p_mvs(MpegEncContext * s);
874 void ff_fix_long_mvs(MpegEncContext * s, uint8_t *field_select_table, int field_select,
875  int16_t (*mv_table)[2], int f_code, int type, int truncate);
876 int ff_init_me(MpegEncContext *s);
877 int ff_pre_estimate_p_frame_motion(MpegEncContext * s, int mb_x, int mb_y);
878 int ff_epzs_motion_search(MpegEncContext * s, int *mx_ptr, int *my_ptr,
879  int P[10][2], int src_index, int ref_index, int16_t (*last_mv)[2],
880  int ref_mv_scale, int size, int h);
881 int ff_get_mb_score(MpegEncContext * s, int mx, int my, int src_index,
882  int ref_index, int size, int h, int add_rate);
883 
884 /* mpeg12.c */
885 extern const uint8_t ff_mpeg1_dc_scale_table[128];
886 extern const uint8_t * const ff_mpeg2_dc_scale_table[4];
887 
888 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number);
889 void ff_mpeg1_encode_mb(MpegEncContext *s,
890  DCTELEM block[6][64],
891  int motion_x, int motion_y);
892 void ff_mpeg1_encode_init(MpegEncContext *s);
893 void ff_mpeg1_encode_slice_header(MpegEncContext *s);
894 void ff_mpeg1_clean_buffers(MpegEncContext *s);
895 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s);
896 
897 extern const uint8_t ff_aic_dc_scale_table[32];
898 extern const uint8_t ff_h263_chroma_qscale_table[32];
899 extern const uint8_t ff_h263_loop_filter_strength[32];
900 
901 /* h261.c */
902 void ff_h261_loop_filter(MpegEncContext *s);
903 void ff_h261_reorder_mb_index(MpegEncContext* s);
904 void ff_h261_encode_mb(MpegEncContext *s,
905  DCTELEM block[6][64],
906  int motion_x, int motion_y);
907 void ff_h261_encode_picture_header(MpegEncContext * s, int picture_number);
908 void ff_h261_encode_init(MpegEncContext *s);
909 int ff_h261_get_picture_format(int width, int height);
910 
911 
912 /* rv10.c */
913 void ff_rv10_encode_picture_header(MpegEncContext *s, int picture_number);
914 int ff_rv_decode_dc(MpegEncContext *s, int n);
915 void ff_rv20_encode_picture_header(MpegEncContext *s, int picture_number);
916 
917 
918 /* msmpeg4.c */
919 void ff_msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number);
920 void ff_msmpeg4_encode_ext_header(MpegEncContext * s);
921 void ff_msmpeg4_encode_mb(MpegEncContext * s,
922  DCTELEM block[6][64],
923  int motion_x, int motion_y);
924 int ff_msmpeg4_decode_picture_header(MpegEncContext * s);
925 int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size);
926 int ff_msmpeg4_decode_init(AVCodecContext *avctx);
927 void ff_msmpeg4_encode_init(MpegEncContext *s);
928 int ff_wmv2_decode_picture_header(MpegEncContext * s);
929 int ff_wmv2_decode_secondary_picture_header(MpegEncContext * s);
930 void ff_wmv2_add_mb(MpegEncContext *s, DCTELEM block[6][64], uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr);
931 void ff_mspel_motion(MpegEncContext *s,
932  uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
933  uint8_t **ref_picture, op_pixels_func (*pix_op)[4],
934  int motion_x, int motion_y, int h);
935 int ff_wmv2_encode_picture_header(MpegEncContext * s, int picture_number);
936 void ff_wmv2_encode_mb(MpegEncContext * s,
937  DCTELEM block[6][64],
938  int motion_x, int motion_y);
939 
940 #endif /* AVCODEC_MPEGVIDEO_H */
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