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mpeg4videoenc.c
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1 /*
2  * MPEG4 encoder.
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
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 #include "libavutil/log.h"
24 #include "libavutil/opt.h"
25 #include "mpegvideo.h"
26 #include "h263.h"
27 #include "mpeg4video.h"
28 
29 //The uni_DCtab_* tables below contain unified bits+length tables to encode DC
30 //differences in mpeg4. Unified in the sense that the specification specifies
31 //this encoding in several steps.
34 static uint16_t uni_DCtab_lum_bits[512];
35 static uint16_t uni_DCtab_chrom_bits[512];
36 
37 //unified encoding tables for run length encoding of coefficients
38 //unified in the sense that the specification specifies the encoding in several steps.
39 static uint32_t uni_mpeg4_intra_rl_bits[64*64*2*2];
40 static uint8_t uni_mpeg4_intra_rl_len [64*64*2*2];
41 static uint32_t uni_mpeg4_inter_rl_bits[64*64*2*2];
42 static uint8_t uni_mpeg4_inter_rl_len [64*64*2*2];
43 //#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128 + (run)*256 + (level))
44 //#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run) + (level)*64)
45 #define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run)*128 + (level))
46 
47 /* mpeg4
48 inter
49 max level: 24/6
50 max run: 53/63
51 
52 intra
53 max level: 53/16
54 max run: 29/41
55 */
56 
57 
58 /**
59  * Return the number of bits that encoding the 8x8 block in block would need.
60  * @param[in] block_last_index last index in scantable order that refers to a non zero element in block.
61  */
62 static inline int get_block_rate(MpegEncContext * s, int16_t block[64], int block_last_index, uint8_t scantable[64]){
63  int last=0;
64  int j;
65  int rate=0;
66 
67  for(j=1; j<=block_last_index; j++){
68  const int index= scantable[j];
69  int level= block[index];
70  if(level){
71  level+= 64;
72  if((level&(~127)) == 0){
73  if(j<block_last_index) rate+= s->intra_ac_vlc_length [UNI_AC_ENC_INDEX(j-last-1, level)];
74  else rate+= s->intra_ac_vlc_last_length[UNI_AC_ENC_INDEX(j-last-1, level)];
75  }else
76  rate += s->ac_esc_length;
77 
78  last= j;
79  }
80  }
81 
82  return rate;
83 }
84 
85 
86 /**
87  * Restore the ac coefficients in block that have been changed by decide_ac_pred().
88  * This function also restores s->block_last_index.
89  * @param[in,out] block MB coefficients, these will be restored
90  * @param[in] dir ac prediction direction for each 8x8 block
91  * @param[out] st scantable for each 8x8 block
92  * @param[in] zigzag_last_index index referring to the last non zero coefficient in zigzag order
93  */
94 static inline void restore_ac_coeffs(MpegEncContext * s, int16_t block[6][64], const int dir[6], uint8_t *st[6], const int zigzag_last_index[6])
95 {
96  int i, n;
97  memcpy(s->block_last_index, zigzag_last_index, sizeof(int)*6);
98 
99  for(n=0; n<6; n++){
100  int16_t *ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
101 
102  st[n]= s->intra_scantable.permutated;
103  if(dir[n]){
104  /* top prediction */
105  for(i=1; i<8; i++){
106  block[n][s->dsp.idct_permutation[i ]] = ac_val[i+8];
107  }
108  }else{
109  /* left prediction */
110  for(i=1; i<8; i++){
111  block[n][s->dsp.idct_permutation[i<<3]]= ac_val[i ];
112  }
113  }
114  }
115 }
116 
117 /**
118  * Return the optimal value (0 or 1) for the ac_pred element for the given MB in mpeg4.
119  * This function will also update s->block_last_index and s->ac_val.
120  * @param[in,out] block MB coefficients, these will be updated if 1 is returned
121  * @param[in] dir ac prediction direction for each 8x8 block
122  * @param[out] st scantable for each 8x8 block
123  * @param[out] zigzag_last_index index referring to the last non zero coefficient in zigzag order
124  */
125 static inline int decide_ac_pred(MpegEncContext * s, int16_t block[6][64], const int dir[6], uint8_t *st[6], int zigzag_last_index[6])
126 {
127  int score= 0;
128  int i, n;
129  int8_t * const qscale_table = s->current_picture.f.qscale_table;
130 
131  memcpy(zigzag_last_index, s->block_last_index, sizeof(int)*6);
132 
133  for(n=0; n<6; n++){
134  int16_t *ac_val, *ac_val1;
135 
136  score -= get_block_rate(s, block[n], s->block_last_index[n], s->intra_scantable.permutated);
137 
138  ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
139  ac_val1= ac_val;
140  if(dir[n]){
141  const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
142  /* top prediction */
143  ac_val-= s->block_wrap[n]*16;
144  if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
145  /* same qscale */
146  for(i=1; i<8; i++){
147  const int level= block[n][s->dsp.idct_permutation[i ]];
148  block[n][s->dsp.idct_permutation[i ]] = level - ac_val[i+8];
149  ac_val1[i ]= block[n][s->dsp.idct_permutation[i<<3]];
150  ac_val1[i+8]= level;
151  }
152  }else{
153  /* different qscale, we must rescale */
154  for(i=1; i<8; i++){
155  const int level= block[n][s->dsp.idct_permutation[i ]];
156  block[n][s->dsp.idct_permutation[i ]] = level - ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
157  ac_val1[i ]= block[n][s->dsp.idct_permutation[i<<3]];
158  ac_val1[i+8]= level;
159  }
160  }
161  st[n]= s->intra_h_scantable.permutated;
162  }else{
163  const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
164  /* left prediction */
165  ac_val-= 16;
166  if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
167  /* same qscale */
168  for(i=1; i<8; i++){
169  const int level= block[n][s->dsp.idct_permutation[i<<3]];
170  block[n][s->dsp.idct_permutation[i<<3]]= level - ac_val[i];
171  ac_val1[i ]= level;
172  ac_val1[i+8]= block[n][s->dsp.idct_permutation[i ]];
173  }
174  }else{
175  /* different qscale, we must rescale */
176  for(i=1; i<8; i++){
177  const int level= block[n][s->dsp.idct_permutation[i<<3]];
178  block[n][s->dsp.idct_permutation[i<<3]]= level - ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
179  ac_val1[i ]= level;
180  ac_val1[i+8]= block[n][s->dsp.idct_permutation[i ]];
181  }
182  }
183  st[n]= s->intra_v_scantable.permutated;
184  }
185 
186  for(i=63; i>0; i--) //FIXME optimize
187  if(block[n][ st[n][i] ]) break;
188  s->block_last_index[n]= i;
189 
190  score += get_block_rate(s, block[n], s->block_last_index[n], st[n]);
191  }
192 
193  if(score < 0){
194  return 1;
195  }else{
196  restore_ac_coeffs(s, block, dir, st, zigzag_last_index);
197  return 0;
198  }
199 }
200 
201 /**
202  * modify mb_type & qscale so that encoding is actually possible in mpeg4
203  */
205  int i;
206  int8_t * const qscale_table = s->current_picture.f.qscale_table;
207 
209 
210  if(s->pict_type== AV_PICTURE_TYPE_B){
211  int odd=0;
212  /* ok, come on, this isn't funny anymore, there's more code for handling this mpeg4 mess than for the actual adaptive quantization */
213 
214  for(i=0; i<s->mb_num; i++){
215  int mb_xy= s->mb_index2xy[i];
216  odd += qscale_table[mb_xy]&1;
217  }
218 
219  if(2*odd > s->mb_num) odd=1;
220  else odd=0;
221 
222  for(i=0; i<s->mb_num; i++){
223  int mb_xy= s->mb_index2xy[i];
224  if((qscale_table[mb_xy]&1) != odd)
225  qscale_table[mb_xy]++;
226  if(qscale_table[mb_xy] > 31)
227  qscale_table[mb_xy]= 31;
228  }
229 
230  for(i=1; i<s->mb_num; i++){
231  int mb_xy= s->mb_index2xy[i];
232  if(qscale_table[mb_xy] != qscale_table[s->mb_index2xy[i-1]] && (s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_DIRECT)){
233  s->mb_type[mb_xy]|= CANDIDATE_MB_TYPE_BIDIR;
234  }
235  }
236  }
237 }
238 
239 
240 /**
241  * Encode the dc value.
242  * @param n block index (0-3 are luma, 4-5 are chroma)
243  */
244 static inline void mpeg4_encode_dc(PutBitContext * s, int level, int n)
245 {
246 #if 1
247  /* DC will overflow if level is outside the [-255,255] range. */
248  level+=256;
249  if (n < 4) {
250  /* luminance */
251  put_bits(s, uni_DCtab_lum_len[level], uni_DCtab_lum_bits[level]);
252  } else {
253  /* chrominance */
255  }
256 #else
257  int size, v;
258  /* find number of bits */
259  size = 0;
260  v = abs(level);
261  while (v) {
262  v >>= 1;
263  size++;
264  }
265 
266  if (n < 4) {
267  /* luminance */
268  put_bits(&s->pb, ff_mpeg4_DCtab_lum[size][1], ff_mpeg4_DCtab_lum[size][0]);
269  } else {
270  /* chrominance */
271  put_bits(&s->pb, ff_mpeg4_DCtab_chrom[size][1], ff_mpeg4_DCtab_chrom[size][0]);
272  }
273 
274  /* encode remaining bits */
275  if (size > 0) {
276  if (level < 0)
277  level = (-level) ^ ((1 << size) - 1);
278  put_bits(&s->pb, size, level);
279  if (size > 8)
280  put_bits(&s->pb, 1, 1);
281  }
282 #endif
283 }
284 
285 static inline int mpeg4_get_dc_length(int level, int n){
286  if (n < 4) {
287  return uni_DCtab_lum_len[level + 256];
288  } else {
289  return uni_DCtab_chrom_len[level + 256];
290  }
291 }
292 
293 /**
294  * Encode an 8x8 block.
295  * @param n block index (0-3 are luma, 4-5 are chroma)
296  */
297 static inline void mpeg4_encode_block(MpegEncContext * s, int16_t * block, int n, int intra_dc,
298  uint8_t *scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb)
299 {
300  int i, last_non_zero;
301  uint32_t *bits_tab;
302  uint8_t *len_tab;
303  const int last_index = s->block_last_index[n];
304 
305  if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
306  /* mpeg4 based DC predictor */
307  mpeg4_encode_dc(dc_pb, intra_dc, n);
308  if(last_index<1) return;
309  i = 1;
310  bits_tab= uni_mpeg4_intra_rl_bits;
311  len_tab = uni_mpeg4_intra_rl_len;
312  } else {
313  if(last_index<0) return;
314  i = 0;
315  bits_tab= uni_mpeg4_inter_rl_bits;
316  len_tab = uni_mpeg4_inter_rl_len;
317  }
318 
319  /* AC coefs */
320  last_non_zero = i - 1;
321  for (; i < last_index; i++) {
322  int level = block[ scan_table[i] ];
323  if (level) {
324  int run = i - last_non_zero - 1;
325  level+=64;
326  if((level&(~127)) == 0){
327  const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
328  put_bits(ac_pb, len_tab[index], bits_tab[index]);
329  }else{ //ESC3
330  put_bits(ac_pb, 7+2+1+6+1+12+1, (3<<23)+(3<<21)+(0<<20)+(run<<14)+(1<<13)+(((level-64)&0xfff)<<1)+1);
331  }
332  last_non_zero = i;
333  }
334  }
335  /*if(i<=last_index)*/{
336  int level = block[ scan_table[i] ];
337  int run = i - last_non_zero - 1;
338  level+=64;
339  if((level&(~127)) == 0){
340  const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
341  put_bits(ac_pb, len_tab[index], bits_tab[index]);
342  }else{ //ESC3
343  put_bits(ac_pb, 7+2+1+6+1+12+1, (3<<23)+(3<<21)+(1<<20)+(run<<14)+(1<<13)+(((level-64)&0xfff)<<1)+1);
344  }
345  }
346 }
347 
348 static int mpeg4_get_block_length(MpegEncContext * s, int16_t * block, int n, int intra_dc,
349  uint8_t *scan_table)
350 {
351  int i, last_non_zero;
352  uint8_t *len_tab;
353  const int last_index = s->block_last_index[n];
354  int len=0;
355 
356  if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
357  /* mpeg4 based DC predictor */
358  len += mpeg4_get_dc_length(intra_dc, n);
359  if(last_index<1) return len;
360  i = 1;
361  len_tab = uni_mpeg4_intra_rl_len;
362  } else {
363  if(last_index<0) return 0;
364  i = 0;
365  len_tab = uni_mpeg4_inter_rl_len;
366  }
367 
368  /* AC coefs */
369  last_non_zero = i - 1;
370  for (; i < last_index; i++) {
371  int level = block[ scan_table[i] ];
372  if (level) {
373  int run = i - last_non_zero - 1;
374  level+=64;
375  if((level&(~127)) == 0){
376  const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
377  len += len_tab[index];
378  }else{ //ESC3
379  len += 7+2+1+6+1+12+1;
380  }
381  last_non_zero = i;
382  }
383  }
384  /*if(i<=last_index)*/{
385  int level = block[ scan_table[i] ];
386  int run = i - last_non_zero - 1;
387  level+=64;
388  if((level&(~127)) == 0){
389  const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
390  len += len_tab[index];
391  }else{ //ESC3
392  len += 7+2+1+6+1+12+1;
393  }
394  }
395 
396  return len;
397 }
398 
399 static inline void mpeg4_encode_blocks(MpegEncContext * s, int16_t block[6][64], int intra_dc[6],
400  uint8_t **scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb){
401  int i;
402 
403  if(scan_table){
404  if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
405  for (i = 0; i < 6; i++) {
406  skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, intra_dc[i], scan_table[i]));
407  }
408  }else{
409  /* encode each block */
410  for (i = 0; i < 6; i++) {
411  mpeg4_encode_block(s, block[i], i, intra_dc[i], scan_table[i], dc_pb, ac_pb);
412  }
413  }
414  }else{
415  if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
416  for (i = 0; i < 6; i++) {
418  }
419  }else{
420  /* encode each block */
421  for (i = 0; i < 6; i++) {
422  mpeg4_encode_block(s, block[i], i, 0, s->intra_scantable.permutated, dc_pb, ac_pb);
423  }
424  }
425  }
426 }
427 
428 static inline int get_b_cbp(MpegEncContext * s, int16_t block[6][64],
429  int motion_x, int motion_y, int mb_type)
430 {
431  int cbp = 0, i;
432 
433  if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {
434  int score = 0;
435  const int lambda = s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
436 
437  for (i = 0; i < 6; i++)
438  if (s->coded_score[i] < 0) {
439  score += s->coded_score[i];
440  cbp |= 1 << (5 - i);
441  }
442 
443  if (cbp) {
444  int zero_score = -6;
445  if ((motion_x | motion_y | s->dquant | mb_type) == 0)
446  zero_score -= 4; //2*MV + mb_type + cbp bit
447 
448  zero_score *= lambda;
449  if (zero_score <= score)
450  cbp = 0;
451  }
452 
453  for (i = 0; i < 6; i++) {
454  if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i)) & 1) == 0) {
455  s->block_last_index[i] = -1;
456  s->dsp.clear_block(s->block[i]);
457  }
458  }
459  } else {
460  for (i = 0; i < 6; i++) {
461  if (s->block_last_index[i] >= 0)
462  cbp |= 1 << (5 - i);
463  }
464  }
465  return cbp;
466 }
467 
468 //FIXME this is duplicated to h263.c
469 static const int dquant_code[5]= {1,0,9,2,3};
470 
472  int16_t block[6][64],
473  int motion_x, int motion_y)
474 {
475  int cbpc, cbpy, pred_x, pred_y;
476  PutBitContext * const pb2 = s->data_partitioning ? &s->pb2 : &s->pb;
477  PutBitContext * const tex_pb = s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B ? &s->tex_pb : &s->pb;
478  PutBitContext * const dc_pb = s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_I ? &s->pb2 : &s->pb;
479  const int interleaved_stats= (s->flags&CODEC_FLAG_PASS1) && !s->data_partitioning ? 1 : 0;
480 
481  if (!s->mb_intra) {
482  int i, cbp;
483 
485  static const int mb_type_table[8]= {-1, 3, 2, 1,-1,-1,-1, 0}; /* convert from mv_dir to type */
486  int mb_type= mb_type_table[s->mv_dir];
487 
488  if(s->mb_x==0){
489  for(i=0; i<2; i++){
490  s->last_mv[i][0][0]=
491  s->last_mv[i][0][1]=
492  s->last_mv[i][1][0]=
493  s->last_mv[i][1][1]= 0;
494  }
495  }
496 
497  av_assert2(s->dquant>=-2 && s->dquant<=2);
498  av_assert2((s->dquant&1)==0);
499  av_assert2(mb_type>=0);
500 
501  /* nothing to do if this MB was skipped in the next P Frame */
502  if (s->next_picture.f.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]) { //FIXME avoid DCT & ...
503  s->skip_count++;
504  s->mv[0][0][0]=
505  s->mv[0][0][1]=
506  s->mv[1][0][0]=
507  s->mv[1][0][1]= 0;
508  s->mv_dir= MV_DIR_FORWARD; //doesn't matter
509  s->qscale -= s->dquant;
510 // s->mb_skipped=1;
511 
512  return;
513  }
514 
515  cbp= get_b_cbp(s, block, motion_x, motion_y, mb_type);
516 
517  if ((cbp | motion_x | motion_y | mb_type) ==0) {
518  /* direct MB with MV={0,0} */
519  av_assert2(s->dquant==0);
520 
521  put_bits(&s->pb, 1, 1); /* mb not coded modb1=1 */
522 
523  if(interleaved_stats){
524  s->misc_bits++;
525  s->last_bits++;
526  }
527  s->skip_count++;
528  return;
529  }
530 
531  put_bits(&s->pb, 1, 0); /* mb coded modb1=0 */
532  put_bits(&s->pb, 1, cbp ? 0 : 1); /* modb2 */ //FIXME merge
533  put_bits(&s->pb, mb_type+1, 1); // this table is so simple that we don't need it :)
534  if(cbp) put_bits(&s->pb, 6, cbp);
535 
536  if(cbp && mb_type){
537  if(s->dquant)
538  put_bits(&s->pb, 2, (s->dquant>>2)+3);
539  else
540  put_bits(&s->pb, 1, 0);
541  }else
542  s->qscale -= s->dquant;
543 
544  if(!s->progressive_sequence){
545  if(cbp)
546  put_bits(&s->pb, 1, s->interlaced_dct);
547  if(mb_type) // not direct mode
548  put_bits(&s->pb, 1, s->mv_type == MV_TYPE_FIELD);
549  }
550 
551  if(interleaved_stats){
552  s->misc_bits+= get_bits_diff(s);
553  }
554 
555  if(mb_type == 0){
557  ff_h263_encode_motion_vector(s, motion_x, motion_y, 1);
558  s->b_count++;
559  s->f_count++;
560  }else{
561  av_assert2(mb_type > 0 && mb_type < 4);
562  if(s->mv_type != MV_TYPE_FIELD){
563  if(s->mv_dir & MV_DIR_FORWARD){
564  ff_h263_encode_motion_vector(s, s->mv[0][0][0] - s->last_mv[0][0][0],
565  s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
566  s->last_mv[0][0][0]= s->last_mv[0][1][0]= s->mv[0][0][0];
567  s->last_mv[0][0][1]= s->last_mv[0][1][1]= s->mv[0][0][1];
568  s->f_count++;
569  }
570  if(s->mv_dir & MV_DIR_BACKWARD){
571  ff_h263_encode_motion_vector(s, s->mv[1][0][0] - s->last_mv[1][0][0],
572  s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
573  s->last_mv[1][0][0]= s->last_mv[1][1][0]= s->mv[1][0][0];
574  s->last_mv[1][0][1]= s->last_mv[1][1][1]= s->mv[1][0][1];
575  s->b_count++;
576  }
577  }else{
578  if(s->mv_dir & MV_DIR_FORWARD){
579  put_bits(&s->pb, 1, s->field_select[0][0]);
580  put_bits(&s->pb, 1, s->field_select[0][1]);
581  }
582  if(s->mv_dir & MV_DIR_BACKWARD){
583  put_bits(&s->pb, 1, s->field_select[1][0]);
584  put_bits(&s->pb, 1, s->field_select[1][1]);
585  }
586  if(s->mv_dir & MV_DIR_FORWARD){
587  for(i=0; i<2; i++){
588  ff_h263_encode_motion_vector(s, s->mv[0][i][0] - s->last_mv[0][i][0] ,
589  s->mv[0][i][1] - s->last_mv[0][i][1]/2, s->f_code);
590  s->last_mv[0][i][0]= s->mv[0][i][0];
591  s->last_mv[0][i][1]= s->mv[0][i][1]*2;
592  }
593  s->f_count++;
594  }
595  if(s->mv_dir & MV_DIR_BACKWARD){
596  for(i=0; i<2; i++){
597  ff_h263_encode_motion_vector(s, s->mv[1][i][0] - s->last_mv[1][i][0] ,
598  s->mv[1][i][1] - s->last_mv[1][i][1]/2, s->b_code);
599  s->last_mv[1][i][0]= s->mv[1][i][0];
600  s->last_mv[1][i][1]= s->mv[1][i][1]*2;
601  }
602  s->b_count++;
603  }
604  }
605  }
606 
607  if(interleaved_stats){
608  s->mv_bits+= get_bits_diff(s);
609  }
610 
611  mpeg4_encode_blocks(s, block, NULL, NULL, NULL, &s->pb);
612 
613  if(interleaved_stats){
614  s->p_tex_bits+= get_bits_diff(s);
615  }
616 
617  }else{ /* s->pict_type==AV_PICTURE_TYPE_B */
618  cbp= get_p_cbp(s, block, motion_x, motion_y);
619 
620  if ((cbp | motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16) {
621  /* check if the B frames can skip it too, as we must skip it if we skip here
622  why didn't they just compress the skip-mb bits instead of reusing them ?! */
623  if(s->max_b_frames>0){
624  int i;
625  int x,y, offset;
626  uint8_t *p_pic;
627 
628  x= s->mb_x*16;
629  y= s->mb_y*16;
630 
631  offset= x + y*s->linesize;
632  p_pic = s->new_picture.f.data[0] + offset;
633 
634  s->mb_skipped=1;
635  for(i=0; i<s->max_b_frames; i++){
636  uint8_t *b_pic;
637  int diff;
638  Picture *pic= s->reordered_input_picture[i+1];
639 
640  if (pic == NULL || pic->f.pict_type != AV_PICTURE_TYPE_B)
641  break;
642 
643  b_pic = pic->f.data[0] + offset;
644  if (pic->f.type != FF_BUFFER_TYPE_SHARED)
645  b_pic+= INPLACE_OFFSET;
646 
647  if(x+16 > s->width || y+16 > s->height){
648  int x1,y1;
649  int xe= FFMIN(16, s->width - x);
650  int ye= FFMIN(16, s->height- y);
651  diff=0;
652  for(y1=0; y1<ye; y1++){
653  for(x1=0; x1<xe; x1++){
654  diff+= FFABS(p_pic[x1+y1*s->linesize] - b_pic[x1+y1*s->linesize]);
655  }
656  }
657  diff= diff*256/(xe*ye);
658  }else{
659  diff= s->dsp.sad[0](NULL, p_pic, b_pic, s->linesize, 16);
660  }
661  if(diff>s->qscale*70){ //FIXME check that 70 is optimal
662  s->mb_skipped=0;
663  break;
664  }
665  }
666  }else
667  s->mb_skipped=1;
668 
669  if(s->mb_skipped==1){
670  /* skip macroblock */
671  put_bits(&s->pb, 1, 1);
672 
673  if(interleaved_stats){
674  s->misc_bits++;
675  s->last_bits++;
676  }
677  s->skip_count++;
678 
679  return;
680  }
681  }
682 
683  put_bits(&s->pb, 1, 0); /* mb coded */
684  cbpc = cbp & 3;
685  cbpy = cbp >> 2;
686  cbpy ^= 0xf;
687  if(s->mv_type==MV_TYPE_16X16){
688  if(s->dquant) cbpc+= 8;
689  put_bits(&s->pb,
692 
693  put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
694  if(s->dquant)
695  put_bits(pb2, 2, dquant_code[s->dquant+2]);
696 
697  if(!s->progressive_sequence){
698  if(cbp)
699  put_bits(pb2, 1, s->interlaced_dct);
700  put_bits(pb2, 1, 0);
701  }
702 
703  if(interleaved_stats){
704  s->misc_bits+= get_bits_diff(s);
705  }
706 
707  /* motion vectors: 16x16 mode */
708  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
709 
710  ff_h263_encode_motion_vector(s, motion_x - pred_x,
711  motion_y - pred_y, s->f_code);
712  }else if(s->mv_type==MV_TYPE_FIELD){
713  if(s->dquant) cbpc+= 8;
714  put_bits(&s->pb,
717 
718  put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
719  if(s->dquant)
720  put_bits(pb2, 2, dquant_code[s->dquant+2]);
721 
723  if(cbp)
724  put_bits(pb2, 1, s->interlaced_dct);
725  put_bits(pb2, 1, 1);
726 
727  if(interleaved_stats){
728  s->misc_bits+= get_bits_diff(s);
729  }
730 
731  /* motion vectors: 16x8 interlaced mode */
732  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
733  pred_y /=2;
734 
735  put_bits(&s->pb, 1, s->field_select[0][0]);
736  put_bits(&s->pb, 1, s->field_select[0][1]);
737 
738  ff_h263_encode_motion_vector(s, s->mv[0][0][0] - pred_x,
739  s->mv[0][0][1] - pred_y, s->f_code);
740  ff_h263_encode_motion_vector(s, s->mv[0][1][0] - pred_x,
741  s->mv[0][1][1] - pred_y, s->f_code);
742  }else{
744  put_bits(&s->pb,
745  ff_h263_inter_MCBPC_bits[cbpc+16],
746  ff_h263_inter_MCBPC_code[cbpc+16]);
747  put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
748 
749  if(!s->progressive_sequence){
750  if(cbp)
751  put_bits(pb2, 1, s->interlaced_dct);
752  }
753 
754  if(interleaved_stats){
755  s->misc_bits+= get_bits_diff(s);
756  }
757 
758  for(i=0; i<4; i++){
759  /* motion vectors: 8x8 mode*/
760  ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
761 
763  s->current_picture.f.motion_val[0][ s->block_index[i] ][1] - pred_y, s->f_code);
764  }
765  }
766 
767  if(interleaved_stats){
768  s->mv_bits+= get_bits_diff(s);
769  }
770 
771  mpeg4_encode_blocks(s, block, NULL, NULL, NULL, tex_pb);
772 
773  if(interleaved_stats){
774  s->p_tex_bits+= get_bits_diff(s);
775  }
776  s->f_count++;
777  }
778  } else {
779  int cbp;
780  int dc_diff[6]; //dc values with the dc prediction subtracted
781  int dir[6]; //prediction direction
782  int zigzag_last_index[6];
783  uint8_t *scan_table[6];
784  int i;
785 
786  for(i=0; i<6; i++){
787  dc_diff[i]= ff_mpeg4_pred_dc(s, i, block[i][0], &dir[i], 1);
788  }
789 
790  if(s->flags & CODEC_FLAG_AC_PRED){
791  s->ac_pred= decide_ac_pred(s, block, dir, scan_table, zigzag_last_index);
792  }else{
793  for(i=0; i<6; i++)
794  scan_table[i]= s->intra_scantable.permutated;
795  }
796 
797  /* compute cbp */
798  cbp = 0;
799  for (i = 0; i < 6; i++) {
800  if (s->block_last_index[i] >= 1)
801  cbp |= 1 << (5 - i);
802  }
803 
804  cbpc = cbp & 3;
805  if (s->pict_type == AV_PICTURE_TYPE_I) {
806  if(s->dquant) cbpc+=4;
807  put_bits(&s->pb,
810  } else {
811  if(s->dquant) cbpc+=8;
812  put_bits(&s->pb, 1, 0); /* mb coded */
813  put_bits(&s->pb,
814  ff_h263_inter_MCBPC_bits[cbpc + 4],
815  ff_h263_inter_MCBPC_code[cbpc + 4]);
816  }
817  put_bits(pb2, 1, s->ac_pred);
818  cbpy = cbp >> 2;
819  put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
820  if(s->dquant)
821  put_bits(dc_pb, 2, dquant_code[s->dquant+2]);
822 
823  if(!s->progressive_sequence){
824  put_bits(dc_pb, 1, s->interlaced_dct);
825  }
826 
827  if(interleaved_stats){
828  s->misc_bits+= get_bits_diff(s);
829  }
830 
831  mpeg4_encode_blocks(s, block, dc_diff, scan_table, dc_pb, tex_pb);
832 
833  if(interleaved_stats){
834  s->i_tex_bits+= get_bits_diff(s);
835  }
836  s->i_count++;
837 
838  /* restore ac coeffs & last_index stuff if we messed them up with the prediction */
839  if(s->ac_pred)
840  restore_ac_coeffs(s, block, dir, scan_table, zigzag_last_index);
841  }
842 }
843 
844 /**
845  * add mpeg4 stuffing bits (01...1)
846  */
848 {
849  int length;
850  put_bits(pbc, 1, 0);
851  length= (-put_bits_count(pbc))&7;
852  if(length) put_bits(pbc, length, (1<<length)-1);
853 }
854 
855 /* must be called before writing the header */
859  }else{
860  s->last_time_base= s->time_base;
861  s->time_base= FFUDIV(s->time, s->avctx->time_base.den);
862  }
863 }
864 
866  int hours, minutes, seconds;
867  int64_t time;
868 
869  put_bits(&s->pb, 16, 0);
870  put_bits(&s->pb, 16, GOP_STARTCODE);
871 
872  time = s->current_picture_ptr->f.pts;
873  if(s->reordered_input_picture[1])
874  time = FFMIN(time, s->reordered_input_picture[1]->f.pts);
875  time= time*s->avctx->time_base.num;
876  s->last_time_base= FFUDIV(time, s->avctx->time_base.den);
877 
878  seconds= FFUDIV(time, s->avctx->time_base.den);
879  minutes= FFUDIV(seconds, 60); seconds = FFUMOD(seconds, 60);
880  hours = FFUDIV(minutes, 60); minutes = FFUMOD(minutes, 60);
881  hours = FFUMOD(hours , 24);
882 
883  put_bits(&s->pb, 5, hours);
884  put_bits(&s->pb, 6, minutes);
885  put_bits(&s->pb, 1, 1);
886  put_bits(&s->pb, 6, seconds);
887 
888  put_bits(&s->pb, 1, !!(s->flags&CODEC_FLAG_CLOSED_GOP));
889  put_bits(&s->pb, 1, 0); //broken link == NO
890 
891  ff_mpeg4_stuffing(&s->pb);
892 }
893 
895  int profile_and_level_indication;
896  int vo_ver_id;
897 
898  if(s->avctx->profile != FF_PROFILE_UNKNOWN){
899  profile_and_level_indication = s->avctx->profile << 4;
900  }else if(s->max_b_frames || s->quarter_sample){
901  profile_and_level_indication= 0xF0; // adv simple
902  }else{
903  profile_and_level_indication= 0x00; // simple
904  }
905 
906  if(s->avctx->level != FF_LEVEL_UNKNOWN){
907  profile_and_level_indication |= s->avctx->level;
908  }else{
909  profile_and_level_indication |= 1; //level 1
910  }
911 
912  if(profile_and_level_indication>>4 == 0xF){
913  vo_ver_id= 5;
914  }else{
915  vo_ver_id= 1;
916  }
917 
918  //FIXME levels
919 
920  put_bits(&s->pb, 16, 0);
921  put_bits(&s->pb, 16, VOS_STARTCODE);
922 
923  put_bits(&s->pb, 8, profile_and_level_indication);
924 
925  put_bits(&s->pb, 16, 0);
926  put_bits(&s->pb, 16, VISUAL_OBJ_STARTCODE);
927 
928  put_bits(&s->pb, 1, 1);
929  put_bits(&s->pb, 4, vo_ver_id);
930  put_bits(&s->pb, 3, 1); //priority
931 
932  put_bits(&s->pb, 4, 1); //visual obj type== video obj
933 
934  put_bits(&s->pb, 1, 0); //video signal type == no clue //FIXME
935 
936  ff_mpeg4_stuffing(&s->pb);
937 }
938 
939 static void mpeg4_encode_vol_header(MpegEncContext * s, int vo_number, int vol_number)
940 {
941  int vo_ver_id;
942 
943  if (!CONFIG_MPEG4_ENCODER) return;
944 
945  if(s->max_b_frames || s->quarter_sample){
946  vo_ver_id= 5;
948  }else{
949  vo_ver_id= 1;
951  }
952 
953  put_bits(&s->pb, 16, 0);
954  put_bits(&s->pb, 16, 0x100 + vo_number); /* video obj */
955  put_bits(&s->pb, 16, 0);
956  put_bits(&s->pb, 16, 0x120 + vol_number); /* video obj layer */
957 
958  put_bits(&s->pb, 1, 0); /* random access vol */
959  put_bits(&s->pb, 8, s->vo_type); /* video obj type indication */
960  if(s->workaround_bugs & FF_BUG_MS) {
961  put_bits(&s->pb, 1, 0); /* is obj layer id= no */
962  } else {
963  put_bits(&s->pb, 1, 1); /* is obj layer id= yes */
964  put_bits(&s->pb, 4, vo_ver_id); /* is obj layer ver id */
965  put_bits(&s->pb, 3, 1); /* is obj layer priority */
966  }
967 
969 
970  put_bits(&s->pb, 4, s->aspect_ratio_info);/* aspect ratio info */
974  put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.num);
975  put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.den);
976  }
977 
978  if(s->workaround_bugs & FF_BUG_MS) { //
979  put_bits(&s->pb, 1, 0); /* vol control parameters= no @@@ */
980  } else {
981  put_bits(&s->pb, 1, 1); /* vol control parameters= yes */
982  put_bits(&s->pb, 2, 1); /* chroma format YUV 420/YV12 */
983  put_bits(&s->pb, 1, s->low_delay);
984  put_bits(&s->pb, 1, 0); /* vbv parameters= no */
985  }
986 
987  put_bits(&s->pb, 2, RECT_SHAPE); /* vol shape= rectangle */
988  put_bits(&s->pb, 1, 1); /* marker bit */
989 
990  put_bits(&s->pb, 16, s->avctx->time_base.den);
991  if (s->time_increment_bits < 1)
992  s->time_increment_bits = 1;
993  put_bits(&s->pb, 1, 1); /* marker bit */
994  put_bits(&s->pb, 1, 0); /* fixed vop rate=no */
995  put_bits(&s->pb, 1, 1); /* marker bit */
996  put_bits(&s->pb, 13, s->width); /* vol width */
997  put_bits(&s->pb, 1, 1); /* marker bit */
998  put_bits(&s->pb, 13, s->height); /* vol height */
999  put_bits(&s->pb, 1, 1); /* marker bit */
1000  put_bits(&s->pb, 1, s->progressive_sequence ? 0 : 1);
1001  put_bits(&s->pb, 1, 1); /* obmc disable */
1002  if (vo_ver_id == 1) {
1003  put_bits(&s->pb, 1, s->vol_sprite_usage); /* sprite enable */
1004  }else{
1005  put_bits(&s->pb, 2, s->vol_sprite_usage); /* sprite enable */
1006  }
1007 
1008  put_bits(&s->pb, 1, 0); /* not 8 bit == false */
1009  put_bits(&s->pb, 1, s->mpeg_quant); /* quant type= (0=h263 style)*/
1010 
1011  if(s->mpeg_quant){
1014  }
1015 
1016  if (vo_ver_id != 1)
1017  put_bits(&s->pb, 1, s->quarter_sample);
1018  put_bits(&s->pb, 1, 1); /* complexity estimation disable */
1019  s->resync_marker= s->rtp_mode;
1020  put_bits(&s->pb, 1, s->resync_marker ? 0 : 1);/* resync marker disable */
1021  put_bits(&s->pb, 1, s->data_partitioning ? 1 : 0);
1022  if(s->data_partitioning){
1023  put_bits(&s->pb, 1, 0); /* no rvlc */
1024  }
1025 
1026  if (vo_ver_id != 1){
1027  put_bits(&s->pb, 1, 0); /* newpred */
1028  put_bits(&s->pb, 1, 0); /* reduced res vop */
1029  }
1030  put_bits(&s->pb, 1, 0); /* scalability */
1031 
1032  ff_mpeg4_stuffing(&s->pb);
1033 
1034  /* user data */
1035  if(!(s->flags & CODEC_FLAG_BITEXACT)){
1036  put_bits(&s->pb, 16, 0);
1037  put_bits(&s->pb, 16, 0x1B2); /* user_data */
1039  }
1040 }
1041 
1042 /* write mpeg4 VOP header */
1043 void ff_mpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
1044 {
1045  int time_incr;
1046  int time_div, time_mod;
1047 
1048  if(s->pict_type==AV_PICTURE_TYPE_I){
1049  if(!(s->flags&CODEC_FLAG_GLOBAL_HEADER)){
1050  if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT) //HACK, the reference sw is buggy
1052  if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT || picture_number==0) //HACK, the reference sw is buggy
1053  mpeg4_encode_vol_header(s, 0, 0);
1054  }
1055  if(!(s->workaround_bugs & FF_BUG_MS))
1057  }
1058 
1060 
1061  put_bits(&s->pb, 16, 0); /* vop header */
1062  put_bits(&s->pb, 16, VOP_STARTCODE); /* vop header */
1063  put_bits(&s->pb, 2, s->pict_type - 1); /* pict type: I = 0 , P = 1 */
1064 
1065  time_div= FFUDIV(s->time, s->avctx->time_base.den);
1066  time_mod= FFUMOD(s->time, s->avctx->time_base.den);
1067  time_incr= time_div - s->last_time_base;
1068  av_assert0(time_incr >= 0);
1069  while(time_incr--)
1070  put_bits(&s->pb, 1, 1);
1071 
1072  put_bits(&s->pb, 1, 0);
1073 
1074  put_bits(&s->pb, 1, 1); /* marker */
1075  put_bits(&s->pb, s->time_increment_bits, time_mod); /* time increment */
1076  put_bits(&s->pb, 1, 1); /* marker */
1077  put_bits(&s->pb, 1, 1); /* vop coded */
1078  if ( s->pict_type == AV_PICTURE_TYPE_P
1080  put_bits(&s->pb, 1, s->no_rounding); /* rounding type */
1081  }
1082  put_bits(&s->pb, 3, 0); /* intra dc VLC threshold */
1083  if(!s->progressive_sequence){
1085  put_bits(&s->pb, 1, s->alternate_scan);
1086  }
1087  //FIXME sprite stuff
1088 
1089  put_bits(&s->pb, 5, s->qscale);
1090 
1091  if (s->pict_type != AV_PICTURE_TYPE_I)
1092  put_bits(&s->pb, 3, s->f_code); /* fcode_for */
1093  if (s->pict_type == AV_PICTURE_TYPE_B)
1094  put_bits(&s->pb, 3, s->b_code); /* fcode_back */
1095 }
1096 
1097 
1098 static void init_uni_dc_tab(void)
1099 {
1100  int level, uni_code, uni_len;
1101 
1102  for(level=-256; level<256; level++){
1103  int size, v, l;
1104  /* find number of bits */
1105  size = 0;
1106  v = abs(level);
1107  while (v) {
1108  v >>= 1;
1109  size++;
1110  }
1111 
1112  if (level < 0)
1113  l= (-level) ^ ((1 << size) - 1);
1114  else
1115  l= level;
1116 
1117  /* luminance */
1118  uni_code= ff_mpeg4_DCtab_lum[size][0];
1119  uni_len = ff_mpeg4_DCtab_lum[size][1];
1120 
1121  if (size > 0) {
1122  uni_code<<=size; uni_code|=l;
1123  uni_len+=size;
1124  if (size > 8){
1125  uni_code<<=1; uni_code|=1;
1126  uni_len++;
1127  }
1128  }
1129  uni_DCtab_lum_bits[level+256]= uni_code;
1130  uni_DCtab_lum_len [level+256]= uni_len;
1131 
1132  /* chrominance */
1133  uni_code= ff_mpeg4_DCtab_chrom[size][0];
1134  uni_len = ff_mpeg4_DCtab_chrom[size][1];
1135 
1136  if (size > 0) {
1137  uni_code<<=size; uni_code|=l;
1138  uni_len+=size;
1139  if (size > 8){
1140  uni_code<<=1; uni_code|=1;
1141  uni_len++;
1142  }
1143  }
1144  uni_DCtab_chrom_bits[level+256]= uni_code;
1145  uni_DCtab_chrom_len [level+256]= uni_len;
1146 
1147  }
1148 }
1149 
1150 static void init_uni_mpeg4_rl_tab(RLTable *rl, uint32_t *bits_tab, uint8_t *len_tab){
1151  int slevel, run, last;
1152 
1153  av_assert0(MAX_LEVEL >= 64);
1154  av_assert0(MAX_RUN >= 63);
1155 
1156  for(slevel=-64; slevel<64; slevel++){
1157  if(slevel==0) continue;
1158  for(run=0; run<64; run++){
1159  for(last=0; last<=1; last++){
1160  const int index= UNI_MPEG4_ENC_INDEX(last, run, slevel+64);
1161  int level= slevel < 0 ? -slevel : slevel;
1162  int sign= slevel < 0 ? 1 : 0;
1163  int bits, len, code;
1164  int level1, run1;
1165 
1166  len_tab[index]= 100;
1167 
1168  /* ESC0 */
1169  code= get_rl_index(rl, last, run, level);
1170  bits= rl->table_vlc[code][0];
1171  len= rl->table_vlc[code][1];
1172  bits=bits*2+sign; len++;
1173 
1174  if(code!=rl->n && len < len_tab[index]){
1175  bits_tab[index]= bits;
1176  len_tab [index]= len;
1177  }
1178  /* ESC1 */
1179  bits= rl->table_vlc[rl->n][0];
1180  len= rl->table_vlc[rl->n][1];
1181  bits=bits*2; len++; //esc1
1182  level1= level - rl->max_level[last][run];
1183  if(level1>0){
1184  code= get_rl_index(rl, last, run, level1);
1185  bits<<= rl->table_vlc[code][1];
1186  len += rl->table_vlc[code][1];
1187  bits += rl->table_vlc[code][0];
1188  bits=bits*2+sign; len++;
1189 
1190  if(code!=rl->n && len < len_tab[index]){
1191  bits_tab[index]= bits;
1192  len_tab [index]= len;
1193  }
1194  }
1195  /* ESC2 */
1196  bits= rl->table_vlc[rl->n][0];
1197  len= rl->table_vlc[rl->n][1];
1198  bits=bits*4+2; len+=2; //esc2
1199  run1 = run - rl->max_run[last][level] - 1;
1200  if(run1>=0){
1201  code= get_rl_index(rl, last, run1, level);
1202  bits<<= rl->table_vlc[code][1];
1203  len += rl->table_vlc[code][1];
1204  bits += rl->table_vlc[code][0];
1205  bits=bits*2+sign; len++;
1206 
1207  if(code!=rl->n && len < len_tab[index]){
1208  bits_tab[index]= bits;
1209  len_tab [index]= len;
1210  }
1211  }
1212  /* ESC3 */
1213  bits= rl->table_vlc[rl->n][0];
1214  len = rl->table_vlc[rl->n][1];
1215  bits=bits*4+3; len+=2; //esc3
1216  bits=bits*2+last; len++;
1217  bits=bits*64+run; len+=6;
1218  bits=bits*2+1; len++; //marker
1219  bits=bits*4096+(slevel&0xfff); len+=12;
1220  bits=bits*2+1; len++; //marker
1221 
1222  if(len < len_tab[index]){
1223  bits_tab[index]= bits;
1224  len_tab [index]= len;
1225  }
1226  }
1227  }
1228  }
1229 }
1230 
1232 {
1233  MpegEncContext *s = avctx->priv_data;
1234  int ret;
1235  static int done = 0;
1236 
1237  if (avctx->width >= (1<<13) || avctx->height >= (1<<13)) {
1238  av_log(avctx, AV_LOG_ERROR, "dimensions too large for MPEG-4\n");
1239  return AVERROR(EINVAL);
1240  }
1241 
1242  if((ret=ff_MPV_encode_init(avctx)) < 0)
1243  return ret;
1244 
1245  if (!done) {
1246  done = 1;
1247 
1248  init_uni_dc_tab();
1249 
1251 
1254  }
1255 
1256  s->min_qcoeff= -2048;
1257  s->max_qcoeff= 2047;
1263  s->ac_esc_length= 7+2+1+6+1+12+1;
1266 
1268 
1269  s->avctx->extradata= av_malloc(1024);
1270  init_put_bits(&s->pb, s->avctx->extradata, 1024);
1271 
1272  if(!(s->workaround_bugs & FF_BUG_MS))
1274  mpeg4_encode_vol_header(s, 0, 0);
1275 
1276 // ff_mpeg4_stuffing(&s->pb); ?
1277  flush_put_bits(&s->pb);
1278  s->avctx->extradata_size= (put_bits_count(&s->pb)+7)>>3;
1279  }
1280  return 0;
1281 }
1282 
1284 {
1285  uint8_t *start= put_bits_ptr(&s->pb);
1286  uint8_t *end= s->pb.buf_end;
1287  int size= end - start;
1288  int pb_size = (((intptr_t)start + size/3)&(~3)) - (intptr_t)start;
1289  int tex_size= (size - 2*pb_size)&(~3);
1290 
1291  set_put_bits_buffer_size(&s->pb, pb_size);
1292  init_put_bits(&s->tex_pb, start + pb_size , tex_size);
1293  init_put_bits(&s->pb2 , start + pb_size + tex_size, pb_size);
1294 }
1295 
1297 {
1298  const int pb2_len = put_bits_count(&s->pb2 );
1299  const int tex_pb_len= put_bits_count(&s->tex_pb);
1300  const int bits= put_bits_count(&s->pb);
1301 
1302  if(s->pict_type==AV_PICTURE_TYPE_I){
1303  put_bits(&s->pb, 19, DC_MARKER);
1304  s->misc_bits+=19 + pb2_len + bits - s->last_bits;
1305  s->i_tex_bits+= tex_pb_len;
1306  }else{
1307  put_bits(&s->pb, 17, MOTION_MARKER);
1308  s->misc_bits+=17 + pb2_len;
1309  s->mv_bits+= bits - s->last_bits;
1310  s->p_tex_bits+= tex_pb_len;
1311  }
1312 
1313  flush_put_bits(&s->pb2);
1314  flush_put_bits(&s->tex_pb);
1315 
1316  set_put_bits_buffer_size(&s->pb, s->pb2.buf_end - s->pb.buf);
1317  avpriv_copy_bits(&s->pb, s->pb2.buf , pb2_len);
1318  avpriv_copy_bits(&s->pb, s->tex_pb.buf, tex_pb_len);
1319  s->last_bits= put_bits_count(&s->pb);
1320 }
1321 
1322 
1324 {
1325  int mb_num_bits= av_log2(s->mb_num - 1) + 1;
1326 
1328  put_bits(&s->pb, 1, 1);
1329 
1330  put_bits(&s->pb, mb_num_bits, s->mb_x + s->mb_y*s->mb_width);
1331  put_bits(&s->pb, s->quant_precision, s->qscale);
1332  put_bits(&s->pb, 1, 0); /* no HEC */
1333 }
1334 
1335 #define OFFSET(x) offsetof(MpegEncContext, x)
1336 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
1337 static const AVOption options[] = {
1338  { "data_partitioning", "Use data partitioning.", OFFSET(data_partitioning), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1339  { "alternate_scan", "Enable alternate scantable.", OFFSET(alternate_scan), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1341  { NULL },
1342 };
1343 
1344 static const AVClass mpeg4enc_class = {
1345  .class_name = "MPEG4 encoder",
1346  .item_name = av_default_item_name,
1347  .option = options,
1348  .version = LIBAVUTIL_VERSION_INT,
1349 };
1350 
1352  .name = "mpeg4",
1353  .type = AVMEDIA_TYPE_VIDEO,
1354  .id = AV_CODEC_ID_MPEG4,
1355  .priv_data_size = sizeof(MpegEncContext),
1356  .init = encode_init,
1357  .encode2 = ff_MPV_encode_picture,
1359  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
1360  .capabilities = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1361  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
1362  .priv_class = &mpeg4enc_class,
1363 };