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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 
63 };
64 
65 #define MPEG_BUF_SIZE (16 * 1024)
66 
67 #define QMAT_SHIFT_MMX 16
68 #define QMAT_SHIFT 21
69 
70 #define MAX_FCODE 7
71 #define MAX_MV 4096
72 
73 #define MAX_THREADS 32
74 #define MAX_PICTURE_COUNT 36
75 
76 #define MAX_B_FRAMES 16
77 
78 #define ME_MAP_SIZE 64
79 #define ME_MAP_SHIFT 3
80 #define ME_MAP_MV_BITS 11
81 
82 #define MAX_MB_BYTES (30*16*16*3/8 + 120)
83 
84 #define INPLACE_OFFSET 16
85 
86 #define EDGE_WIDTH 16
87 
88 /* Start codes. */
89 #define SEQ_END_CODE 0x000001b7
90 #define SEQ_START_CODE 0x000001b3
91 #define GOP_START_CODE 0x000001b8
92 #define PICTURE_START_CODE 0x00000100
93 #define SLICE_MIN_START_CODE 0x00000101
94 #define SLICE_MAX_START_CODE 0x000001af
95 #define EXT_START_CODE 0x000001b5
96 #define USER_START_CODE 0x000001b2
97 
98 /* encoding scans */
99 extern const uint8_t ff_alternate_horizontal_scan[64];
100 extern const uint8_t ff_alternate_vertical_scan[64];
101 
102 struct MpegEncContext;
103 
104 /**
105  * Picture.
106  */
107 typedef struct Picture{
108  struct AVFrame *f;
110 
112  int8_t *qscale_table;
113 
115  int16_t (*motion_val[2])[2];
116 
118  uint32_t *mb_type; ///< types and macros are defined in mpegutils.h
119 
122 
124  int8_t *ref_index[2];
125 
127  uint16_t *mb_var; ///< Table for MB variances
128 
130  uint16_t *mc_mb_var; ///< Table for motion compensated MB variances
131 
132  int alloc_mb_width; ///< mb_width used to allocate tables
133  int alloc_mb_height; ///< mb_height used to allocate tables
134 
136  uint8_t *mb_mean; ///< Table for MB luminance
137 
139  /**
140  * hardware accelerator private data
141  */
143 
144  int field_picture; ///< whether or not the picture was encoded in separate fields
145 
146  int64_t mb_var_sum; ///< sum of MB variance for current frame
147  int64_t mc_mb_var_sum; ///< motion compensated MB variance for current frame
148 
150  int needs_realloc; ///< Picture needs to be reallocated (eg due to a frame size change)
151 
153  int shared;
154 
156 } Picture;
157 
158 /**
159  * Motion estimation context.
160  */
161 typedef struct MotionEstContext{
163  int skip; ///< set if ME is skipped for the current MB
164  int co_located_mv[4][2]; ///< mv from last P-frame for direct mode ME
165  int direct_basis_mv[4][2];
166  uint8_t *scratchpad; ///< data area for the ME algo, so that the ME does not need to malloc/free
171  uint32_t *map; ///< map to avoid duplicate evaluations
172  uint32_t *score_map; ///< map to store the scores
173  unsigned map_generation;
175  int penalty_factor; /**< an estimate of the bits required to
176  code a given mv value, e.g. (1,0) takes
177  more bits than (0,0). We have to
178  estimate whether any reduction in
179  residual is worth the extra bits. */
182  int flags;
184  int mb_flags;
185  int pre_pass; ///< = 1 for the pre pass
186  int dia_size;
187  int xmin;
188  int xmax;
189  int ymin;
190  int ymax;
191  int pred_x;
192  int pred_y;
193  uint8_t *src[4][4];
194  uint8_t *ref[4][4];
195  int stride;
196  int uvstride;
197  /* temp variables for picture complexity calculation */
201 /* cmp, chroma_cmp;*/
206  uint8_t (*mv_penalty)[MAX_MV*2+1]; ///< amount of bits needed to encode a MV
209  int *mx_ptr, int *my_ptr, int dmin,
210  int src_index, int ref_index,
211  int size, int h);
213 
214 /**
215  * MpegEncContext.
216  */
217 typedef struct MpegEncContext {
218  AVClass *class;
219 
221  int ac_pred;
222  int block_last_index[12]; ///< last non zero coefficient in block
223  int h263_aic; ///< Advanded INTRA Coding (AIC)
224 
225  /* scantables */
226  ScanTable inter_scantable; ///< if inter == intra then intra should be used to reduce tha cache usage
230 
231  /* WARNING: changes above this line require updates to hardcoded
232  * offsets used in asm. */
233 
235  /* the following parameters must be initialized before encoding */
236  int width, height;///< picture size. must be a multiple of 16
237  int gop_size;
238  int intra_only; ///< if true, only intra pictures are generated
239  int bit_rate; ///< wanted bit rate
240  enum OutputFormat out_format; ///< output format
241  int h263_pred; ///< use mpeg4/h263 ac/dc predictions
242  int pb_frame; ///< PB frame mode (0 = none, 1 = base, 2 = improved)
243 
244 /* the following codec id fields are deprecated in favor of codec_id */
245  int h263_plus; ///< h263 plus headers
246  int h263_flv; ///< use flv h263 header
247 
248  enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
249  int fixed_qscale; ///< fixed qscale if non zero
250  int encoding; ///< true if we are encoding (vs decoding)
251  int flags; ///< AVCodecContext.flags (HQ, MV4, ...)
252  int flags2; ///< AVCodecContext.flags2
253  int max_b_frames; ///< max number of b-frames for encoding
256  int strict_std_compliance; ///< strictly follow the std (MPEG4, ...)
257  int workaround_bugs; ///< workaround bugs in encoders which cannot be detected automatically
258  int codec_tag; ///< internal codec_tag upper case converted from avctx codec_tag
259  int stream_codec_tag; ///< internal stream_codec_tag upper case converted from avctx stream_codec_tag
260  /* the following fields are managed internally by the encoder */
261 
262  /* sequence parameters */
264  int input_picture_number; ///< used to set pic->display_picture_number, should not be used for/by anything else
265  int coded_picture_number; ///< used to set pic->coded_picture_number, should not be used for/by anything else
266  int picture_number; //FIXME remove, unclear definition
267  int picture_in_gop_number; ///< 0-> first pic in gop, ...
268  int mb_width, mb_height; ///< number of MBs horizontally & vertically
269  int mb_stride; ///< mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11
270  int b8_stride; ///< 2*mb_width+1 used for some 8x8 block arrays to allow simple addressing
271  int h_edge_pos, v_edge_pos;///< horizontal / vertical position of the right/bottom edge (pixel replication)
272  int mb_num; ///< number of MBs of a picture
273  ptrdiff_t linesize; ///< line size, in bytes, may be different from width
274  ptrdiff_t uvlinesize; ///< line size, for chroma in bytes, may be different from width
275  Picture *picture; ///< main picture buffer
276  Picture **input_picture; ///< next pictures on display order for encoding
277  Picture **reordered_input_picture; ///< pointer to the next pictures in codedorder for encoding
278 
279  int64_t user_specified_pts; ///< last non-zero pts from AVFrame which was passed into avcodec_encode_video2()
280  /**
281  * pts difference between the first and second input frame, used for
282  * calculating dts of the first frame when there's a delay */
283  int64_t dts_delta;
284  /**
285  * reordered pts to be used as dts for the next output frame when there's
286  * a delay */
287  int64_t reordered_pts;
288 
289  /** bit output */
291 
292  int start_mb_y; ///< start mb_y of this thread (so current thread should process start_mb_y <= row < end_mb_y)
293  int end_mb_y; ///< end mb_y of this thread (so current thread should process start_mb_y <= row < end_mb_y)
295  int slice_context_count; ///< number of used thread_contexts
296 
297  /**
298  * copy of the previous picture structure.
299  * note, linesize & data, might not match the previous picture (for field pictures)
300  */
302 
303  /**
304  * copy of the next picture structure.
305  * note, linesize & data, might not match the next picture (for field pictures)
306  */
308 
309  /**
310  * copy of the source picture structure for encoding.
311  * note, linesize & data, might not match the source picture (for field pictures)
312  */
314 
315  /**
316  * copy of the current picture structure.
317  * note, linesize & data, might not match the current picture (for field pictures)
318  */
319  Picture current_picture; ///< buffer to store the decompressed current picture
320 
321  Picture *last_picture_ptr; ///< pointer to the previous picture.
322  Picture *next_picture_ptr; ///< pointer to the next picture (for bidir pred)
323  Picture *current_picture_ptr; ///< pointer to the current picture
324  int last_dc[3]; ///< last DC values for MPEG1
325  int16_t *dc_val_base;
326  int16_t *dc_val[3]; ///< used for mpeg4 DC prediction, all 3 arrays must be continuous
327  const uint8_t *y_dc_scale_table; ///< qscale -> y_dc_scale table
328  const uint8_t *c_dc_scale_table; ///< qscale -> c_dc_scale table
329  const uint8_t *chroma_qscale_table; ///< qscale -> chroma_qscale (h263)
331  uint8_t *coded_block; ///< used for coded block pattern prediction (msmpeg4v3, wmv1)
332  int16_t (*ac_val_base)[16];
333  int16_t (*ac_val[3])[16]; ///< used for mpeg4 AC prediction, all 3 arrays must be continuous
334  int mb_skipped; ///< MUST BE SET only during DECODING
335  uint8_t *mbskip_table; /**< used to avoid copy if macroblock skipped (for black regions for example)
336  and used for b-frame encoding & decoding (contains skip table of next P Frame) */
337  uint8_t *mbintra_table; ///< used to avoid setting {ac, dc, cbp}-pred stuff to zero on inter MB decoding
338  uint8_t *cbp_table; ///< used to store cbp, ac_pred for partitioned decoding
339  uint8_t *pred_dir_table; ///< used to store pred_dir for partitioned decoding
340  uint8_t *edge_emu_buffer; ///< temporary buffer for if MVs point to out-of-frame data
341  uint8_t *rd_scratchpad; ///< scratchpad for rate distortion mb decision
343  uint8_t *b_scratchpad; ///< scratchpad used for writing into write only buffers
344 
345  int qscale; ///< QP
346  int chroma_qscale; ///< chroma QP
347  unsigned int lambda; ///< lagrange multipler used in rate distortion
348  unsigned int lambda2; ///< (lambda*lambda) >> FF_LAMBDA_SHIFT
350  int adaptive_quant; ///< use adaptive quantization
351  int dquant; ///< qscale difference to prev qscale
352  int closed_gop; ///< MPEG1/2 GOP is closed
353  int pict_type; ///< AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
355  int last_pict_type; //FIXME removes
356  int last_non_b_pict_type; ///< used for mpeg4 gmc b-frames & ratecontrol
360  int last_lambda_for[5]; ///< last lambda for a specific pict type
361  int skipdct; ///< skip dct and code zero residual
362 
363  /* motion compensation */
364  int unrestricted_mv; ///< mv can point outside of the coded picture
365  int h263_long_vectors; ///< use horrible h263v1 long vector mode
366 
379  int f_code; ///< forward MV resolution
380  int b_code; ///< backward MV resolution for B Frames (mpeg4)
381  int16_t (*p_mv_table_base)[2];
382  int16_t (*b_forw_mv_table_base)[2];
383  int16_t (*b_back_mv_table_base)[2];
386  int16_t (*b_direct_mv_table_base)[2];
387  int16_t (*p_field_mv_table_base[2][2])[2];
388  int16_t (*b_field_mv_table_base[2][2][2])[2];
389  int16_t (*p_mv_table)[2]; ///< MV table (1MV per MB) p-frame encoding
390  int16_t (*b_forw_mv_table)[2]; ///< MV table (1MV per MB) forward mode b-frame encoding
391  int16_t (*b_back_mv_table)[2]; ///< MV table (1MV per MB) backward mode b-frame encoding
392  int16_t (*b_bidir_forw_mv_table)[2]; ///< MV table (1MV per MB) bidir mode b-frame encoding
393  int16_t (*b_bidir_back_mv_table)[2]; ///< MV table (1MV per MB) bidir mode b-frame encoding
394  int16_t (*b_direct_mv_table)[2]; ///< MV table (1MV per MB) direct mode b-frame encoding
395  int16_t (*p_field_mv_table[2][2])[2]; ///< MV table (2MV per MB) interlaced p-frame encoding
396  int16_t (*b_field_mv_table[2][2][2])[2];///< MV table (4MV per MB) interlaced b-frame encoding
399  int me_method; ///< ME algorithm
400  int mv_dir;
401 #define MV_DIR_FORWARD 1
402 #define MV_DIR_BACKWARD 2
403 #define MV_DIRECT 4 ///< bidirectional mode where the difference equals the MV of the last P/S/I-Frame (mpeg4)
404  int mv_type;
405 #define MV_TYPE_16X16 0 ///< 1 vector for the whole mb
406 #define MV_TYPE_8X8 1 ///< 4 vectors (h263, mpeg4 4MV)
407 #define MV_TYPE_16X8 2 ///< 2 vectors, one per 16x8 block
408 #define MV_TYPE_FIELD 3 ///< 2 vectors, one per field
409 #define MV_TYPE_DMV 4 ///< 2 vectors, special mpeg2 Dual Prime Vectors
410  /**motion vectors for a macroblock
411  first coordinate : 0 = forward 1 = backward
412  second " : depend on type
413  third " : 0 = x, 1 = y
414  */
415  int mv[2][4][2];
416  int field_select[2][2];
417  int last_mv[2][2][2]; ///< last MV, used for MV prediction in MPEG1 & B-frame MPEG4
418  uint8_t *fcode_tab; ///< smallest fcode needed for each MV
419  int16_t direct_scale_mv[2][64]; ///< precomputed to avoid divisions in ff_mpeg4_set_direct_mv
420 
422 
423  int no_rounding; /**< apply no rounding to motion compensation (MPEG4, msmpeg4, ...)
424  for b-frames rounding mode is always 0 */
425 
426  /* macroblock layer */
427  int mb_x, mb_y;
429  int mb_intra;
430  uint16_t *mb_type; ///< Table for candidate MB types for encoding (defines in mpegutils.h)
431 
432  int block_index[6]; ///< index to current MB in block based arrays with edges
433  int block_wrap[6];
435 
436  int *mb_index2xy; ///< mb_index -> mb_x + mb_y*mb_stride
437 
438  /** matrix transmitted in the bitstream */
439  uint16_t intra_matrix[64];
440  uint16_t chroma_intra_matrix[64];
441  uint16_t inter_matrix[64];
442  uint16_t chroma_inter_matrix[64];
443 #define QUANT_BIAS_SHIFT 8
444  int intra_quant_bias; ///< bias for the quantizer
445  int inter_quant_bias; ///< bias for the quantizer
446  int min_qcoeff; ///< minimum encodable coefficient
447  int max_qcoeff; ///< maximum encodable coefficient
448  int ac_esc_length; ///< num of bits needed to encode the longest esc
454 #define UNI_AC_ENC_INDEX(run,level) ((run)*128 + (level))
455 
456  int coded_score[12];
457 
458  /** precomputed matrix (combine qscale and DCT renorm) */
459  int (*q_intra_matrix)[64];
461  int (*q_inter_matrix)[64];
462  /** identical to the above but for MMX & these are not permutated, second 64 entries are bias*/
463  uint16_t (*q_intra_matrix16)[2][64];
464  uint16_t (*q_chroma_intra_matrix16)[2][64];
465  uint16_t (*q_inter_matrix16)[2][64];
466 
467  /* noise reduction */
468  int (*dct_error_sum)[64];
469  int dct_count[2];
470  uint16_t (*dct_offset)[64];
471 
472  void *opaque; ///< private data for the user
473 
474  /* bit rate control */
475  int64_t total_bits;
476  int frame_bits; ///< bits used for the current frame
477  int stuffing_bits; ///< bits used for stuffing
478  int next_lambda; ///< next lambda used for retrying to encode a frame
479  RateControlContext rc_context; ///< contains stuff only accessed in ratecontrol.c
480 
481  /* statistics, used for 2-pass encoding */
482  int mv_bits;
486  int i_count;
487  int f_count;
488  int b_count;
490  int misc_bits; ///< cbp, mb_type
491  int last_bits; ///< temp var used for calculating the above vars
492 
493  /* error concealment / resync */
494  int resync_mb_x; ///< x position of last resync marker
495  int resync_mb_y; ///< y position of last resync marker
496  GetBitContext last_resync_gb; ///< used to search for the next resync marker
497  int mb_num_left; ///< number of MBs left in this video packet (for partitioned Slices only)
498  int next_p_frame_damaged; ///< set if the next p frame is damaged, to avoid showing trashed b frames
500 
502 
503  /* H.263 specific */
505  int obmc; ///< overlapped block motion compensation
506  int mb_info; ///< interval for outputting info about mb offsets as side data
510  int ehc_mode;
511 
512  /* H.263+ specific */
513  int umvplus; ///< == H263+ && unrestricted_mv
514  int h263_aic_dir; ///< AIC direction: 0 = left, 1 = top
516  int alt_inter_vlc; ///< alternative inter vlc
520 
521  /* mpeg4 specific */
522  ///< number of bits to represent the fractional part of time (encoder only)
525  int time_base; ///< time in seconds of last I,P,S Frame
526  int64_t time; ///< time of current frame
528  uint16_t pp_time; ///< time distance between the last 2 p,s,i frames
529  uint16_t pb_time; ///< time distance between the last b and p,s,i frame
530  uint16_t pp_field_time;
531  uint16_t pb_field_time; ///< like above, just for interlaced
533  int sprite_offset[2][2]; ///< sprite offset[isChroma][isMVY]
534  int sprite_delta[2][2]; ///< sprite_delta [isY][isMVY]
535  int mcsel;
537  int quarter_sample; ///< 1->qpel, 0->half pel ME/MC
538  int aspect_ratio_info; //FIXME remove
540  int data_partitioning; ///< data partitioning flag from header
541  int partitioned_frame; ///< is current frame partitioned
542  int low_delay; ///< no reordering needed / has no b-frames
543  int vo_type;
544  int vol_control_parameters; ///< does the stream contain the low_delay flag, used to workaround buggy encoders
545  PutBitContext tex_pb; ///< used for data partitioned VOPs
546  PutBitContext pb2; ///< used for data partitioned VOPs
548  int padding_bug_score; ///< used to detect the VERY common padding bug in MPEG4
549 
550  /* divx specific, used to workaround (many) bugs in divx5 */
552  uint8_t *bitstream_buffer; //Divx 5.01 puts several frames in a single one, this is used to reorder them
555 
556  /* RV10 specific */
557  int rv10_version; ///< RV10 version: 0 or 3
559 
560  /* MJPEG specific */
562  int esc_pos;
563 
564  /* MSMPEG4 specific */
570  int slice_height; ///< in macroblocks
571  int first_slice_line; ///< used in mpeg4 too to handle resync markers
573  int msmpeg4_version; ///< 0=not msmpeg4, 1=mp41, 2=mp42, 3=mp43/divx3 4=wmv1/7 5=wmv2/8
577  /** [mb_intra][isChroma][level][run][last] */
578  int (*ac_stats)[2][MAX_LEVEL+1][MAX_RUN+1][2];
580  int mspel;
581 
582  /* decompression specific */
584 
585  /* Mpeg1 specific */
586  int gop_picture_number; ///< index of the first picture of a GOP based on fake_pic_num & mpeg1 specific
587  int last_mv_dir; ///< last mv_dir, used for b frame encoding
588  uint8_t *vbv_delay_ptr; ///< pointer to vbv_delay in the bitstream
589 
590  /* MPEG-2-specific - I wished not to have to support this mess. */
592  int mpeg_f_code[2][2];
593 
594  // picture structure defines are loaded from mpegutils.h
596 
608 #define CHROMA_420 1
609 #define CHROMA_422 2
610 #define CHROMA_444 3
611  int chroma_x_shift;//depend on pix_format, that depend on chroma_format
613 
615  int full_pel[2];
617  int first_field; ///< is 1 for the first field of a field picture 0 otherwise
618  int drop_frame_timecode; ///< timecode is in drop frame format.
619  int scan_offset; ///< reserve space for SVCD scan offset user data.
620 
621  /* RTP specific */
622  int rtp_mode;
623 
624  char *tc_opt_str; ///< timecode option string
625  AVTimecode tc; ///< timecode context
626 
628  int swap_uv; //vcr2 codec is an MPEG-2 variant with U and V swapped
629  int pack_pblocks; //xvmc needs to keep blocks without gaps.
630  int16_t (*pblocks[12])[64];
631 
632  int16_t (*block)[64]; ///< points to one of the following blocks
633  int16_t (*blocks)[12][64]; // for HQ mode we need to keep the best block
634  int (*decode_mb)(struct MpegEncContext *s, int16_t block[6][64]); // used by some codecs to avoid a switch()
635 #define SLICE_OK 0
636 #define SLICE_ERROR -1
637 #define SLICE_END -2 ///<end marker found
638 #define SLICE_NOEND -3 ///<no end marker or error found but mb count exceeded
639 
641  int16_t *block/*align 16*/, int n, int qscale);
643  int16_t *block/*align 16*/, int n, int qscale);
645  int16_t *block/*align 16*/, int n, int qscale);
647  int16_t *block/*align 16*/, int n, int qscale);
649  int16_t *block/*align 16*/, int n, int qscale);
651  int16_t *block/*align 16*/, int n, int qscale);
653  int16_t *block/*align 16*/, int n, int qscale);
655  int16_t *block/*align 16*/, int n, int qscale);
656  void (*dct_unquantize_intra)(struct MpegEncContext *s, // unquantizer to use (mpeg4 can use both)
657  int16_t *block/*align 16*/, int n, int qscale);
658  void (*dct_unquantize_inter)(struct MpegEncContext *s, // unquantizer to use (mpeg4 can use both)
659  int16_t *block/*align 16*/, int n, int qscale);
660  int (*dct_quantize)(struct MpegEncContext *s, int16_t *block/*align 16*/, int n, int qscale, int *overflow);
661  int (*fast_dct_quantize)(struct MpegEncContext *s, int16_t *block/*align 16*/, int n, int qscale, int *overflow);
662  void (*denoise_dct)(struct MpegEncContext *s, int16_t *block);
663 
664  int mpv_flags; ///< flags set by private options
666 
667  /* temp buffers for rate control */
668  float *cplx_tab, *bits_tab;
669 
670  /* flag to indicate a reinitialization is required, e.g. after
671  * a frame size change */
673 
675 
677 
678  /* temporary frames used by b_frame_strategy = 2 */
681 
682 #define REBASE_PICTURE(pic, new_ctx, old_ctx) \
683  ((pic && pic >= old_ctx->picture && \
684  pic < old_ctx->picture + MAX_PICTURE_COUNT) ? \
685  &new_ctx->picture[pic - old_ctx->picture] : NULL)
686 
687 /* mpegvideo_enc common options */
688 #define FF_MPV_FLAG_SKIP_RD 0x0001
689 #define FF_MPV_FLAG_STRICT_GOP 0x0002
690 #define FF_MPV_FLAG_QP_RD 0x0004
691 #define FF_MPV_FLAG_CBP_RD 0x0008
692 #define FF_MPV_FLAG_NAQ 0x0010
693 #define FF_MPV_FLAG_MV0 0x0020
694 
695 #define FF_MPV_OFFSET(x) offsetof(MpegEncContext, x)
696 #define FF_MPV_OPT_FLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
697 #define FF_MPV_COMMON_OPTS \
698 { "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" },\
699 { "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" },\
700 { "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" },\
701 { "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" },\
702 { "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" },\
703 { "naq", "normalize adaptive quantization", 0, AV_OPT_TYPE_CONST, { .i64 = FF_MPV_FLAG_NAQ }, 0, 0, FF_MPV_OPT_FLAGS, "mpv_flags" },\
704 { "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" },\
705 { "luma_elim_threshold", "single coefficient elimination threshold for luminance (negative values also consider dc coefficient)",\
706  FF_MPV_OFFSET(luma_elim_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FF_MPV_OPT_FLAGS },\
707 { "chroma_elim_threshold", "single coefficient elimination threshold for chrominance (negative values also consider dc coefficient)",\
708  FF_MPV_OFFSET(chroma_elim_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, FF_MPV_OPT_FLAGS },\
709 { "quantizer_noise_shaping", NULL, FF_MPV_OFFSET(quantizer_noise_shaping), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FF_MPV_OPT_FLAGS },\
710 { "error_rate", "Simulate errors in the bitstream to test error concealment.", \
711  FF_MPV_OFFSET(error_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FF_MPV_OPT_FLAGS },
712 
713 extern const AVOption ff_mpv_generic_options[];
714 
715 #define FF_MPV_GENERIC_CLASS(name) \
716 static const AVClass name ## _class = {\
717  .class_name = #name " encoder",\
718  .item_name = av_default_item_name,\
719  .option = ff_mpv_generic_options,\
720  .version = LIBAVUTIL_VERSION_INT,\
721 };
722 
723 /**
724  * Set the given MpegEncContext to common defaults (same for encoding
725  * and decoding). The changed fields will not depend upon the prior
726  * state of the MpegEncContext.
727  */
729 
734 void ff_MPV_decode_mb(MpegEncContext *s, int16_t block[12][64]);
740  const AVFrame *frame, int *got_packet);
748 void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h);
750 
753  uint32_t *mbtype_table, int8_t *qscale_table, int16_t (*motion_val[2])[2],
754  int *low_delay,
755  int mb_width, int mb_height, int mb_stride, int quarter_sample);
756 
757 int ff_mpv_export_qp_table(MpegEncContext *s, AVFrame *f, Picture *p, int qp_type);
758 
759 void ff_write_quant_matrix(PutBitContext *pb, uint16_t *matrix);
760 int ff_find_unused_picture(MpegEncContext *s, int shared);
761 void ff_denoise_dct(MpegEncContext *s, int16_t *block);
766 void ff_set_qscale(MpegEncContext * s, int qscale);
767 
770 void ff_convert_matrix(MpegEncContext *s, int (*qmat)[64], uint16_t (*qmat16)[2][64],
771  const uint16_t *quant_matrix, int bias, int qmin, int qmax, int intra);
772 int ff_dct_quantize_c(MpegEncContext *s, int16_t *block, int n, int qscale, int *overflow);
773 
775 
777  uint8_t *dest_y, uint8_t *dest_cb,
778  uint8_t *dest_cr, int dir,
779  uint8_t **ref_picture,
780  op_pixels_func (*pix_op)[4],
781  qpel_mc_func (*qpix_op)[16]);
782 
783 /**
784  * Allocate a Picture.
785  * The pixels are allocated/set by calling get_buffer() if shared = 0.
786  */
787 int ff_alloc_picture(MpegEncContext *s, Picture *pic, int shared);
788 
789 /**
790  * permute block according to permuatation.
791  * @param last last non zero element in scantable order
792  */
793 void ff_block_permute(int16_t *block, uint8_t *permutation, const uint8_t *scantable, int last);
794 
795 static inline void ff_update_block_index(MpegEncContext *s){
796  const int block_size= 8 >> s->avctx->lowres;
797 
798  s->block_index[0]+=2;
799  s->block_index[1]+=2;
800  s->block_index[2]+=2;
801  s->block_index[3]+=2;
802  s->block_index[4]++;
803  s->block_index[5]++;
804  s->dest[0]+= 2*block_size;
805  s->dest[1]+= block_size;
806  s->dest[2]+= block_size;
807 }
808 
809 static inline int get_bits_diff(MpegEncContext *s){
810  const int bits= put_bits_count(&s->pb);
811  const int last= s->last_bits;
812 
813  s->last_bits = bits;
814 
815  return bits - last;
816 }
817 
818 static inline int ff_h263_round_chroma(int x){
819  static const uint8_t h263_chroma_roundtab[16] = {
820  // 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
821  0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
822  };
823  return h263_chroma_roundtab[x & 0xf] + (x >> 3);
824 }
825 
826 /* motion_est.c */
828  int mb_x, int mb_y);
830  int mb_x, int mb_y);
831 int ff_get_best_fcode(MpegEncContext * s, int16_t (*mv_table)[2], int type);
833 void ff_fix_long_mvs(MpegEncContext * s, uint8_t *field_select_table, int field_select,
834  int16_t (*mv_table)[2], int f_code, int type, int truncate);
835 int ff_init_me(MpegEncContext *s);
837 int ff_epzs_motion_search(MpegEncContext * s, int *mx_ptr, int *my_ptr,
838  int P[10][2], int src_index, int ref_index, int16_t (*last_mv)[2],
839  int ref_mv_scale, int size, int h);
840 int ff_get_mb_score(MpegEncContext * s, int mx, int my, int src_index,
841  int ref_index, int size, int h, int add_rate);
842 
843 /* mpeg12.c */
844 extern const uint8_t ff_mpeg1_dc_scale_table[128];
845 extern const uint8_t * const ff_mpeg2_dc_scale_table[4];
846 
849  int16_t block[6][64],
850  int motion_x, int motion_y);
853 
854 extern const uint8_t ff_aic_dc_scale_table[32];
855 extern const uint8_t ff_h263_chroma_qscale_table[32];
856 
857 /* rv10.c */
859 int ff_rv_decode_dc(MpegEncContext *s, int n);
861 
862 
863 /* msmpeg4.c */
867  int16_t block[6][64],
868  int motion_x, int motion_y);
870 int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size);
875 void ff_wmv2_add_mb(MpegEncContext *s, int16_t block[6][64], uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr);
877  uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
878  uint8_t **ref_picture, op_pixels_func (*pix_op)[4],
879  int motion_x, int motion_y, int h);
882  int16_t block[6][64],
883  int motion_x, int motion_y);
884 
888 
889 
890 #endif /* AVCODEC_MPEGVIDEO_H */