FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
mpeg4videoenc.c
Go to the documentation of this file.
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/attributes.h"
24 #include "libavutil/log.h"
25 #include "libavutil/opt.h"
26 #include "mpegvideo.h"
27 #include "h263.h"
28 #include "mpeg4video.h"
29 
30 //The uni_DCtab_* tables below contain unified bits+length tables to encode DC
31 //differences in mpeg4. Unified in the sense that the specification specifies
32 //this encoding in several steps.
35 static uint16_t uni_DCtab_lum_bits[512];
36 static uint16_t uni_DCtab_chrom_bits[512];
37 
38 //unified encoding tables for run length encoding of coefficients
39 //unified in the sense that the specification specifies the encoding in several steps.
40 static uint32_t uni_mpeg4_intra_rl_bits[64*64*2*2];
41 static uint8_t uni_mpeg4_intra_rl_len [64*64*2*2];
42 static uint32_t uni_mpeg4_inter_rl_bits[64*64*2*2];
43 static uint8_t uni_mpeg4_inter_rl_len [64*64*2*2];
44 //#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128 + (run)*256 + (level))
45 //#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run) + (level)*64)
46 #define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run)*128 + (level))
47 
48 /* mpeg4
49 inter
50 max level: 24/6
51 max run: 53/63
52 
53 intra
54 max level: 53/16
55 max run: 29/41
56 */
57 
58 
59 /**
60  * Return the number of bits that encoding the 8x8 block in block would need.
61  * @param[in] block_last_index last index in scantable order that refers to a non zero element in block.
62  */
63 static inline int get_block_rate(MpegEncContext * s, int16_t block[64], int block_last_index, uint8_t scantable[64]){
64  int last=0;
65  int j;
66  int rate=0;
67 
68  for(j=1; j<=block_last_index; j++){
69  const int index= scantable[j];
70  int level= block[index];
71  if(level){
72  level+= 64;
73  if((level&(~127)) == 0){
74  if(j<block_last_index) rate+= s->intra_ac_vlc_length [UNI_AC_ENC_INDEX(j-last-1, level)];
75  else rate+= s->intra_ac_vlc_last_length[UNI_AC_ENC_INDEX(j-last-1, level)];
76  }else
77  rate += s->ac_esc_length;
78 
79  last= j;
80  }
81  }
82 
83  return rate;
84 }
85 
86 
87 /**
88  * Restore the ac coefficients in block that have been changed by decide_ac_pred().
89  * This function also restores s->block_last_index.
90  * @param[in,out] block MB coefficients, these will be restored
91  * @param[in] dir ac prediction direction for each 8x8 block
92  * @param[out] st scantable for each 8x8 block
93  * @param[in] zigzag_last_index index referring to the last non zero coefficient in zigzag order
94  */
95 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])
96 {
97  int i, n;
98  memcpy(s->block_last_index, zigzag_last_index, sizeof(int)*6);
99 
100  for(n=0; n<6; n++){
101  int16_t *ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
102 
103  st[n]= s->intra_scantable.permutated;
104  if(dir[n]){
105  /* top prediction */
106  for(i=1; i<8; i++){
107  block[n][s->dsp.idct_permutation[i ]] = ac_val[i+8];
108  }
109  }else{
110  /* left prediction */
111  for(i=1; i<8; i++){
112  block[n][s->dsp.idct_permutation[i<<3]]= ac_val[i ];
113  }
114  }
115  }
116 }
117 
118 /**
119  * Return the optimal value (0 or 1) for the ac_pred element for the given MB in mpeg4.
120  * This function will also update s->block_last_index and s->ac_val.
121  * @param[in,out] block MB coefficients, these will be updated if 1 is returned
122  * @param[in] dir ac prediction direction for each 8x8 block
123  * @param[out] st scantable for each 8x8 block
124  * @param[out] zigzag_last_index index referring to the last non zero coefficient in zigzag order
125  */
126 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])
127 {
128  int score= 0;
129  int i, n;
130  int8_t * const qscale_table = s->current_picture.qscale_table;
131 
132  memcpy(zigzag_last_index, s->block_last_index, sizeof(int)*6);
133 
134  for(n=0; n<6; n++){
135  int16_t *ac_val, *ac_val1;
136 
137  score -= get_block_rate(s, block[n], s->block_last_index[n], s->intra_scantable.permutated);
138 
139  ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
140  ac_val1= ac_val;
141  if(dir[n]){
142  const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
143  /* top prediction */
144  ac_val-= s->block_wrap[n]*16;
145  if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
146  /* same qscale */
147  for(i=1; i<8; i++){
148  const int level= block[n][s->dsp.idct_permutation[i ]];
149  block[n][s->dsp.idct_permutation[i ]] = level - ac_val[i+8];
150  ac_val1[i ]= block[n][s->dsp.idct_permutation[i<<3]];
151  ac_val1[i+8]= level;
152  }
153  }else{
154  /* different qscale, we must rescale */
155  for(i=1; i<8; i++){
156  const int level= block[n][s->dsp.idct_permutation[i ]];
157  block[n][s->dsp.idct_permutation[i ]] = level - ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
158  ac_val1[i ]= block[n][s->dsp.idct_permutation[i<<3]];
159  ac_val1[i+8]= level;
160  }
161  }
163  }else{
164  const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
165  /* left prediction */
166  ac_val-= 16;
167  if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
168  /* same qscale */
169  for(i=1; i<8; i++){
170  const int level= block[n][s->dsp.idct_permutation[i<<3]];
171  block[n][s->dsp.idct_permutation[i<<3]]= level - ac_val[i];
172  ac_val1[i ]= level;
173  ac_val1[i+8]= block[n][s->dsp.idct_permutation[i ]];
174  }
175  }else{
176  /* different qscale, we must rescale */
177  for(i=1; i<8; i++){
178  const int level= block[n][s->dsp.idct_permutation[i<<3]];
179  block[n][s->dsp.idct_permutation[i<<3]]= level - ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
180  ac_val1[i ]= level;
181  ac_val1[i+8]= block[n][s->dsp.idct_permutation[i ]];
182  }
183  }
185  }
186 
187  for(i=63; i>0; i--) //FIXME optimize
188  if(block[n][ st[n][i] ]) break;
189  s->block_last_index[n]= i;
190 
191  score += get_block_rate(s, block[n], s->block_last_index[n], st[n]);
192  }
193 
194  if(score < 0){
195  return 1;
196  }else{
197  restore_ac_coeffs(s, block, dir, st, zigzag_last_index);
198  return 0;
199  }
200 }
201 
202 /**
203  * modify mb_type & qscale so that encoding is actually possible in mpeg4
204  */
206  int i;
207  int8_t * const qscale_table = s->current_picture.qscale_table;
208 
210 
211  if(s->pict_type== AV_PICTURE_TYPE_B){
212  int odd=0;
213  /* ok, come on, this isn't funny anymore, there's more code for handling this mpeg4 mess than for the actual adaptive quantization */
214 
215  for(i=0; i<s->mb_num; i++){
216  int mb_xy= s->mb_index2xy[i];
217  odd += qscale_table[mb_xy]&1;
218  }
219 
220  if(2*odd > s->mb_num) odd=1;
221  else odd=0;
222 
223  for(i=0; i<s->mb_num; i++){
224  int mb_xy= s->mb_index2xy[i];
225  if((qscale_table[mb_xy]&1) != odd)
226  qscale_table[mb_xy]++;
227  if(qscale_table[mb_xy] > 31)
228  qscale_table[mb_xy]= 31;
229  }
230 
231  for(i=1; i<s->mb_num; i++){
232  int mb_xy= s->mb_index2xy[i];
233  if(qscale_table[mb_xy] != qscale_table[s->mb_index2xy[i-1]] && (s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_DIRECT)){
234  s->mb_type[mb_xy]|= CANDIDATE_MB_TYPE_BIDIR;
235  }
236  }
237  }
238 }
239 
240 
241 /**
242  * Encode the dc value.
243  * @param n block index (0-3 are luma, 4-5 are chroma)
244  */
245 static inline void mpeg4_encode_dc(PutBitContext * s, int level, int n)
246 {
247 #if 1
248  /* DC will overflow if level is outside the [-255,255] range. */
249  level+=256;
250  if (n < 4) {
251  /* luminance */
252  put_bits(s, uni_DCtab_lum_len[level], uni_DCtab_lum_bits[level]);
253  } else {
254  /* chrominance */
256  }
257 #else
258  int size, v;
259  /* find number of bits */
260  size = 0;
261  v = abs(level);
262  while (v) {
263  v >>= 1;
264  size++;
265  }
266 
267  if (n < 4) {
268  /* luminance */
269  put_bits(&s->pb, ff_mpeg4_DCtab_lum[size][1], ff_mpeg4_DCtab_lum[size][0]);
270  } else {
271  /* chrominance */
272  put_bits(&s->pb, ff_mpeg4_DCtab_chrom[size][1], ff_mpeg4_DCtab_chrom[size][0]);
273  }
274 
275  /* encode remaining bits */
276  if (size > 0) {
277  if (level < 0)
278  level = (-level) ^ ((1 << size) - 1);
279  put_bits(&s->pb, size, level);
280  if (size > 8)
281  put_bits(&s->pb, 1, 1);
282  }
283 #endif
284 }
285 
286 static inline int mpeg4_get_dc_length(int level, int n){
287  if (n < 4) {
288  return uni_DCtab_lum_len[level + 256];
289  } else {
290  return uni_DCtab_chrom_len[level + 256];
291  }
292 }
293 
294 /**
295  * Encode an 8x8 block.
296  * @param n block index (0-3 are luma, 4-5 are chroma)
297  */
298 static inline void mpeg4_encode_block(MpegEncContext * s, int16_t * block, int n, int intra_dc,
299  uint8_t *scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb)
300 {
301  int i, last_non_zero;
302  uint32_t *bits_tab;
303  uint8_t *len_tab;
304  const int last_index = s->block_last_index[n];
305 
306  if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
307  /* mpeg4 based DC predictor */
308  mpeg4_encode_dc(dc_pb, intra_dc, n);
309  if(last_index<1) return;
310  i = 1;
311  bits_tab= uni_mpeg4_intra_rl_bits;
312  len_tab = uni_mpeg4_intra_rl_len;
313  } else {
314  if(last_index<0) return;
315  i = 0;
316  bits_tab= uni_mpeg4_inter_rl_bits;
317  len_tab = uni_mpeg4_inter_rl_len;
318  }
319 
320  /* AC coefs */
321  last_non_zero = i - 1;
322  for (; i < last_index; i++) {
323  int level = block[ scan_table[i] ];
324  if (level) {
325  int run = i - last_non_zero - 1;
326  level+=64;
327  if((level&(~127)) == 0){
328  const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
329  put_bits(ac_pb, len_tab[index], bits_tab[index]);
330  }else{ //ESC3
331  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);
332  }
333  last_non_zero = i;
334  }
335  }
336  /*if(i<=last_index)*/{
337  int level = block[ scan_table[i] ];
338  int run = i - last_non_zero - 1;
339  level+=64;
340  if((level&(~127)) == 0){
341  const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
342  put_bits(ac_pb, len_tab[index], bits_tab[index]);
343  }else{ //ESC3
344  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);
345  }
346  }
347 }
348 
349 static int mpeg4_get_block_length(MpegEncContext * s, int16_t * block, int n, int intra_dc,
350  uint8_t *scan_table)
351 {
352  int i, last_non_zero;
353  uint8_t *len_tab;
354  const int last_index = s->block_last_index[n];
355  int len=0;
356 
357  if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
358  /* mpeg4 based DC predictor */
359  len += mpeg4_get_dc_length(intra_dc, n);
360  if(last_index<1) return len;
361  i = 1;
362  len_tab = uni_mpeg4_intra_rl_len;
363  } else {
364  if(last_index<0) return 0;
365  i = 0;
366  len_tab = uni_mpeg4_inter_rl_len;
367  }
368 
369  /* AC coefs */
370  last_non_zero = i - 1;
371  for (; i < last_index; i++) {
372  int level = block[ scan_table[i] ];
373  if (level) {
374  int run = i - last_non_zero - 1;
375  level+=64;
376  if((level&(~127)) == 0){
377  const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
378  len += len_tab[index];
379  }else{ //ESC3
380  len += 7+2+1+6+1+12+1;
381  }
382  last_non_zero = i;
383  }
384  }
385  /*if(i<=last_index)*/{
386  int level = block[ scan_table[i] ];
387  int run = i - last_non_zero - 1;
388  level+=64;
389  if((level&(~127)) == 0){
390  const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
391  len += len_tab[index];
392  }else{ //ESC3
393  len += 7+2+1+6+1+12+1;
394  }
395  }
396 
397  return len;
398 }
399 
400 static inline void mpeg4_encode_blocks(MpegEncContext * s, int16_t block[6][64], int intra_dc[6],
401  uint8_t **scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb){
402  int i;
403 
404  if(scan_table){
405  if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
406  for (i = 0; i < 6; i++) {
407  skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, intra_dc[i], scan_table[i]));
408  }
409  }else{
410  /* encode each block */
411  for (i = 0; i < 6; i++) {
412  mpeg4_encode_block(s, block[i], i, intra_dc[i], scan_table[i], dc_pb, ac_pb);
413  }
414  }
415  }else{
416  if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
417  for (i = 0; i < 6; i++) {
419  }
420  }else{
421  /* encode each block */
422  for (i = 0; i < 6; i++) {
423  mpeg4_encode_block(s, block[i], i, 0, s->intra_scantable.permutated, dc_pb, ac_pb);
424  }
425  }
426  }
427 }
428 
429 static inline int get_b_cbp(MpegEncContext * s, int16_t block[6][64],
430  int motion_x, int motion_y, int mb_type)
431 {
432  int cbp = 0, i;
433 
434  if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {
435  int score = 0;
436  const int lambda = s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
437 
438  for (i = 0; i < 6; i++)
439  if (s->coded_score[i] < 0) {
440  score += s->coded_score[i];
441  cbp |= 1 << (5 - i);
442  }
443 
444  if (cbp) {
445  int zero_score = -6;
446  if ((motion_x | motion_y | s->dquant | mb_type) == 0)
447  zero_score -= 4; //2*MV + mb_type + cbp bit
448 
449  zero_score *= lambda;
450  if (zero_score <= score)
451  cbp = 0;
452  }
453 
454  for (i = 0; i < 6; i++) {
455  if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i)) & 1) == 0) {
456  s->block_last_index[i] = -1;
457  s->dsp.clear_block(s->block[i]);
458  }
459  }
460  } else {
461  for (i = 0; i < 6; i++) {
462  if (s->block_last_index[i] >= 0)
463  cbp |= 1 << (5 - i);
464  }
465  }
466  return cbp;
467 }
468 
469 //FIXME this is duplicated to h263.c
470 static const int dquant_code[5]= {1,0,9,2,3};
471 
473  int16_t block[6][64],
474  int motion_x, int motion_y)
475 {
476  int cbpc, cbpy, pred_x, pred_y;
477  PutBitContext * const pb2 = s->data_partitioning ? &s->pb2 : &s->pb;
478  PutBitContext * const tex_pb = s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B ? &s->tex_pb : &s->pb;
479  PutBitContext * const dc_pb = s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_I ? &s->pb2 : &s->pb;
480  const int interleaved_stats= (s->flags&CODEC_FLAG_PASS1) && !s->data_partitioning ? 1 : 0;
481 
482  if (!s->mb_intra) {
483  int i, cbp;
484 
486  static const int mb_type_table[8]= {-1, 3, 2, 1,-1,-1,-1, 0}; /* convert from mv_dir to type */
487  int mb_type= mb_type_table[s->mv_dir];
488 
489  if(s->mb_x==0){
490  for(i=0; i<2; i++){
491  s->last_mv[i][0][0]=
492  s->last_mv[i][0][1]=
493  s->last_mv[i][1][0]=
494  s->last_mv[i][1][1]= 0;
495  }
496  }
497 
498  av_assert2(s->dquant>=-2 && s->dquant<=2);
499  av_assert2((s->dquant&1)==0);
500  av_assert2(mb_type>=0);
501 
502  /* nothing to do if this MB was skipped in the next P Frame */
503  if (s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]) { //FIXME avoid DCT & ...
504  s->skip_count++;
505  s->mv[0][0][0]=
506  s->mv[0][0][1]=
507  s->mv[1][0][0]=
508  s->mv[1][0][1]= 0;
509  s->mv_dir= MV_DIR_FORWARD; //doesn't matter
510  s->qscale -= s->dquant;
511 // s->mb_skipped=1;
512 
513  return;
514  }
515 
516  cbp= get_b_cbp(s, block, motion_x, motion_y, mb_type);
517 
518  if ((cbp | motion_x | motion_y | mb_type) ==0) {
519  /* direct MB with MV={0,0} */
520  av_assert2(s->dquant==0);
521 
522  put_bits(&s->pb, 1, 1); /* mb not coded modb1=1 */
523 
524  if(interleaved_stats){
525  s->misc_bits++;
526  s->last_bits++;
527  }
528  s->skip_count++;
529  return;
530  }
531 
532  put_bits(&s->pb, 1, 0); /* mb coded modb1=0 */
533  put_bits(&s->pb, 1, cbp ? 0 : 1); /* modb2 */ //FIXME merge
534  put_bits(&s->pb, mb_type+1, 1); // this table is so simple that we don't need it :)
535  if(cbp) put_bits(&s->pb, 6, cbp);
536 
537  if(cbp && mb_type){
538  if(s->dquant)
539  put_bits(&s->pb, 2, (s->dquant>>2)+3);
540  else
541  put_bits(&s->pb, 1, 0);
542  }else
543  s->qscale -= s->dquant;
544 
545  if(!s->progressive_sequence){
546  if(cbp)
547  put_bits(&s->pb, 1, s->interlaced_dct);
548  if(mb_type) // not direct mode
549  put_bits(&s->pb, 1, s->mv_type == MV_TYPE_FIELD);
550  }
551 
552  if(interleaved_stats){
553  s->misc_bits+= get_bits_diff(s);
554  }
555 
556  if(mb_type == 0){
558  ff_h263_encode_motion_vector(s, motion_x, motion_y, 1);
559  s->b_count++;
560  s->f_count++;
561  }else{
562  av_assert2(mb_type > 0 && mb_type < 4);
563  if(s->mv_type != MV_TYPE_FIELD){
564  if(s->mv_dir & MV_DIR_FORWARD){
565  ff_h263_encode_motion_vector(s, s->mv[0][0][0] - s->last_mv[0][0][0],
566  s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
567  s->last_mv[0][0][0]= s->last_mv[0][1][0]= s->mv[0][0][0];
568  s->last_mv[0][0][1]= s->last_mv[0][1][1]= s->mv[0][0][1];
569  s->f_count++;
570  }
571  if(s->mv_dir & MV_DIR_BACKWARD){
572  ff_h263_encode_motion_vector(s, s->mv[1][0][0] - s->last_mv[1][0][0],
573  s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
574  s->last_mv[1][0][0]= s->last_mv[1][1][0]= s->mv[1][0][0];
575  s->last_mv[1][0][1]= s->last_mv[1][1][1]= s->mv[1][0][1];
576  s->b_count++;
577  }
578  }else{
579  if(s->mv_dir & MV_DIR_FORWARD){
580  put_bits(&s->pb, 1, s->field_select[0][0]);
581  put_bits(&s->pb, 1, s->field_select[0][1]);
582  }
583  if(s->mv_dir & MV_DIR_BACKWARD){
584  put_bits(&s->pb, 1, s->field_select[1][0]);
585  put_bits(&s->pb, 1, s->field_select[1][1]);
586  }
587  if(s->mv_dir & MV_DIR_FORWARD){
588  for(i=0; i<2; i++){
589  ff_h263_encode_motion_vector(s, s->mv[0][i][0] - s->last_mv[0][i][0] ,
590  s->mv[0][i][1] - s->last_mv[0][i][1]/2, s->f_code);
591  s->last_mv[0][i][0]= s->mv[0][i][0];
592  s->last_mv[0][i][1]= s->mv[0][i][1]*2;
593  }
594  s->f_count++;
595  }
596  if(s->mv_dir & MV_DIR_BACKWARD){
597  for(i=0; i<2; i++){
598  ff_h263_encode_motion_vector(s, s->mv[1][i][0] - s->last_mv[1][i][0] ,
599  s->mv[1][i][1] - s->last_mv[1][i][1]/2, s->b_code);
600  s->last_mv[1][i][0]= s->mv[1][i][0];
601  s->last_mv[1][i][1]= s->mv[1][i][1]*2;
602  }
603  s->b_count++;
604  }
605  }
606  }
607 
608  if(interleaved_stats){
609  s->mv_bits+= get_bits_diff(s);
610  }
611 
612  mpeg4_encode_blocks(s, block, NULL, NULL, NULL, &s->pb);
613 
614  if(interleaved_stats){
615  s->p_tex_bits+= get_bits_diff(s);
616  }
617 
618  }else{ /* s->pict_type==AV_PICTURE_TYPE_B */
619  cbp= get_p_cbp(s, block, motion_x, motion_y);
620 
621  if ((cbp | motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16) {
622  /* check if the B frames can skip it too, as we must skip it if we skip here
623  why didn't they just compress the skip-mb bits instead of reusing them ?! */
624  if(s->max_b_frames>0){
625  int i;
626  int x,y, offset;
627  uint8_t *p_pic;
628 
629  x= s->mb_x*16;
630  y= s->mb_y*16;
631 
632  offset= x + y*s->linesize;
633  p_pic = s->new_picture.f.data[0] + offset;
634 
635  s->mb_skipped=1;
636  for(i=0; i<s->max_b_frames; i++){
637  uint8_t *b_pic;
638  int diff;
639  Picture *pic= s->reordered_input_picture[i+1];
640 
641  if (pic == NULL || pic->f.pict_type != AV_PICTURE_TYPE_B)
642  break;
643 
644  b_pic = pic->f.data[0] + offset;
645  if (!pic->shared)
646  b_pic+= INPLACE_OFFSET;
647 
648  if(x+16 > s->width || y+16 > s->height){
649  int x1,y1;
650  int xe= FFMIN(16, s->width - x);
651  int ye= FFMIN(16, s->height- y);
652  diff=0;
653  for(y1=0; y1<ye; y1++){
654  for(x1=0; x1<xe; x1++){
655  diff+= FFABS(p_pic[x1+y1*s->linesize] - b_pic[x1+y1*s->linesize]);
656  }
657  }
658  diff= diff*256/(xe*ye);
659  }else{
660  diff= s->dsp.sad[0](NULL, p_pic, b_pic, s->linesize, 16);
661  }
662  if(diff>s->qscale*70){ //FIXME check that 70 is optimal
663  s->mb_skipped=0;
664  break;
665  }
666  }
667  }else
668  s->mb_skipped=1;
669 
670  if(s->mb_skipped==1){
671  /* skip macroblock */
672  put_bits(&s->pb, 1, 1);
673 
674  if(interleaved_stats){
675  s->misc_bits++;
676  s->last_bits++;
677  }
678  s->skip_count++;
679 
680  return;
681  }
682  }
683 
684  put_bits(&s->pb, 1, 0); /* mb coded */
685  cbpc = cbp & 3;
686  cbpy = cbp >> 2;
687  cbpy ^= 0xf;
688  if(s->mv_type==MV_TYPE_16X16){
689  if(s->dquant) cbpc+= 8;
690  put_bits(&s->pb,
693 
694  put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
695  if(s->dquant)
696  put_bits(pb2, 2, dquant_code[s->dquant+2]);
697 
698  if(!s->progressive_sequence){
699  if(cbp)
700  put_bits(pb2, 1, s->interlaced_dct);
701  put_bits(pb2, 1, 0);
702  }
703 
704  if(interleaved_stats){
705  s->misc_bits+= get_bits_diff(s);
706  }
707 
708  /* motion vectors: 16x16 mode */
709  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
710 
711  ff_h263_encode_motion_vector(s, motion_x - pred_x,
712  motion_y - pred_y, s->f_code);
713  }else if(s->mv_type==MV_TYPE_FIELD){
714  if(s->dquant) cbpc+= 8;
715  put_bits(&s->pb,
718 
719  put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
720  if(s->dquant)
721  put_bits(pb2, 2, dquant_code[s->dquant+2]);
722 
724  if(cbp)
725  put_bits(pb2, 1, s->interlaced_dct);
726  put_bits(pb2, 1, 1);
727 
728  if(interleaved_stats){
729  s->misc_bits+= get_bits_diff(s);
730  }
731 
732  /* motion vectors: 16x8 interlaced mode */
733  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
734  pred_y /=2;
735 
736  put_bits(&s->pb, 1, s->field_select[0][0]);
737  put_bits(&s->pb, 1, s->field_select[0][1]);
738 
739  ff_h263_encode_motion_vector(s, s->mv[0][0][0] - pred_x,
740  s->mv[0][0][1] - pred_y, s->f_code);
741  ff_h263_encode_motion_vector(s, s->mv[0][1][0] - pred_x,
742  s->mv[0][1][1] - pred_y, s->f_code);
743  }else{
745  put_bits(&s->pb,
746  ff_h263_inter_MCBPC_bits[cbpc+16],
747  ff_h263_inter_MCBPC_code[cbpc+16]);
748  put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
749 
750  if(!s->progressive_sequence){
751  if(cbp)
752  put_bits(pb2, 1, s->interlaced_dct);
753  }
754 
755  if(interleaved_stats){
756  s->misc_bits+= get_bits_diff(s);
757  }
758 
759  for(i=0; i<4; i++){
760  /* motion vectors: 8x8 mode*/
761  ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
762 
764  s->current_picture.motion_val[0][ s->block_index[i] ][1] - pred_y, s->f_code);
765  }
766  }
767 
768  if(interleaved_stats){
769  s->mv_bits+= get_bits_diff(s);
770  }
771 
772  mpeg4_encode_blocks(s, block, NULL, NULL, NULL, tex_pb);
773 
774  if(interleaved_stats){
775  s->p_tex_bits+= get_bits_diff(s);
776  }
777  s->f_count++;
778  }
779  } else {
780  int cbp;
781  int dc_diff[6]; //dc values with the dc prediction subtracted
782  int dir[6]; //prediction direction
783  int zigzag_last_index[6];
784  uint8_t *scan_table[6];
785  int i;
786 
787  for(i=0; i<6; i++){
788  dc_diff[i]= ff_mpeg4_pred_dc(s, i, block[i][0], &dir[i], 1);
789  }
790 
791  if(s->flags & CODEC_FLAG_AC_PRED){
792  s->ac_pred= decide_ac_pred(s, block, dir, scan_table, zigzag_last_index);
793  }else{
794  for(i=0; i<6; i++)
795  scan_table[i]= s->intra_scantable.permutated;
796  }
797 
798  /* compute cbp */
799  cbp = 0;
800  for (i = 0; i < 6; i++) {
801  if (s->block_last_index[i] >= 1)
802  cbp |= 1 << (5 - i);
803  }
804 
805  cbpc = cbp & 3;
806  if (s->pict_type == AV_PICTURE_TYPE_I) {
807  if(s->dquant) cbpc+=4;
808  put_bits(&s->pb,
811  } else {
812  if(s->dquant) cbpc+=8;
813  put_bits(&s->pb, 1, 0); /* mb coded */
814  put_bits(&s->pb,
815  ff_h263_inter_MCBPC_bits[cbpc + 4],
816  ff_h263_inter_MCBPC_code[cbpc + 4]);
817  }
818  put_bits(pb2, 1, s->ac_pred);
819  cbpy = cbp >> 2;
820  put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
821  if(s->dquant)
822  put_bits(dc_pb, 2, dquant_code[s->dquant+2]);
823 
824  if(!s->progressive_sequence){
825  put_bits(dc_pb, 1, s->interlaced_dct);
826  }
827 
828  if(interleaved_stats){
829  s->misc_bits+= get_bits_diff(s);
830  }
831 
832  mpeg4_encode_blocks(s, block, dc_diff, scan_table, dc_pb, tex_pb);
833 
834  if(interleaved_stats){
835  s->i_tex_bits+= get_bits_diff(s);
836  }
837  s->i_count++;
838 
839  /* restore ac coeffs & last_index stuff if we messed them up with the prediction */
840  if(s->ac_pred)
841  restore_ac_coeffs(s, block, dir, scan_table, zigzag_last_index);
842  }
843 }
844 
845 /**
846  * add mpeg4 stuffing bits (01...1)
847  */
849 {
850  int length;
851  put_bits(pbc, 1, 0);
852  length= (-put_bits_count(pbc))&7;
853  if(length) put_bits(pbc, length, (1<<length)-1);
854 }
855 
856 /* must be called before writing the header */
860  }else{
861  s->last_time_base= s->time_base;
862  s->time_base= FFUDIV(s->time, s->avctx->time_base.den);
863  }
864 }
865 
867  int hours, minutes, seconds;
868  int64_t time;
869 
870  put_bits(&s->pb, 16, 0);
871  put_bits(&s->pb, 16, GOP_STARTCODE);
872 
873  time = s->current_picture_ptr->f.pts;
874  if(s->reordered_input_picture[1])
875  time = FFMIN(time, s->reordered_input_picture[1]->f.pts);
876  time= time*s->avctx->time_base.num;
877  s->last_time_base= FFUDIV(time, s->avctx->time_base.den);
878 
879  seconds= FFUDIV(time, s->avctx->time_base.den);
880  minutes= FFUDIV(seconds, 60); seconds = FFUMOD(seconds, 60);
881  hours = FFUDIV(minutes, 60); minutes = FFUMOD(minutes, 60);
882  hours = FFUMOD(hours , 24);
883 
884  put_bits(&s->pb, 5, hours);
885  put_bits(&s->pb, 6, minutes);
886  put_bits(&s->pb, 1, 1);
887  put_bits(&s->pb, 6, seconds);
888 
889  put_bits(&s->pb, 1, !!(s->flags&CODEC_FLAG_CLOSED_GOP));
890  put_bits(&s->pb, 1, 0); //broken link == NO
891 
892  ff_mpeg4_stuffing(&s->pb);
893 }
894 
896  int profile_and_level_indication;
897  int vo_ver_id;
898 
899  if(s->avctx->profile != FF_PROFILE_UNKNOWN){
900  profile_and_level_indication = s->avctx->profile << 4;
901  }else if(s->max_b_frames || s->quarter_sample){
902  profile_and_level_indication= 0xF0; // adv simple
903  }else{
904  profile_and_level_indication= 0x00; // simple
905  }
906 
907  if(s->avctx->level != FF_LEVEL_UNKNOWN){
908  profile_and_level_indication |= s->avctx->level;
909  }else{
910  profile_and_level_indication |= 1; //level 1
911  }
912 
913  if(profile_and_level_indication>>4 == 0xF){
914  vo_ver_id= 5;
915  }else{
916  vo_ver_id= 1;
917  }
918 
919  //FIXME levels
920 
921  put_bits(&s->pb, 16, 0);
922  put_bits(&s->pb, 16, VOS_STARTCODE);
923 
924  put_bits(&s->pb, 8, profile_and_level_indication);
925 
926  put_bits(&s->pb, 16, 0);
927  put_bits(&s->pb, 16, VISUAL_OBJ_STARTCODE);
928 
929  put_bits(&s->pb, 1, 1);
930  put_bits(&s->pb, 4, vo_ver_id);
931  put_bits(&s->pb, 3, 1); //priority
932 
933  put_bits(&s->pb, 4, 1); //visual obj type== video obj
934 
935  put_bits(&s->pb, 1, 0); //video signal type == no clue //FIXME
936 
937  ff_mpeg4_stuffing(&s->pb);
938 }
939 
940 static void mpeg4_encode_vol_header(MpegEncContext * s, int vo_number, int vol_number)
941 {
942  int vo_ver_id;
943 
944  if (!CONFIG_MPEG4_ENCODER) return;
945 
946  if(s->max_b_frames || s->quarter_sample){
947  vo_ver_id= 5;
949  }else{
950  vo_ver_id= 1;
952  }
953 
954  put_bits(&s->pb, 16, 0);
955  put_bits(&s->pb, 16, 0x100 + vo_number); /* video obj */
956  put_bits(&s->pb, 16, 0);
957  put_bits(&s->pb, 16, 0x120 + vol_number); /* video obj layer */
958 
959  put_bits(&s->pb, 1, 0); /* random access vol */
960  put_bits(&s->pb, 8, s->vo_type); /* video obj type indication */
961  if(s->workaround_bugs & FF_BUG_MS) {
962  put_bits(&s->pb, 1, 0); /* is obj layer id= no */
963  } else {
964  put_bits(&s->pb, 1, 1); /* is obj layer id= yes */
965  put_bits(&s->pb, 4, vo_ver_id); /* is obj layer ver id */
966  put_bits(&s->pb, 3, 1); /* is obj layer priority */
967  }
968 
970 
971  put_bits(&s->pb, 4, s->aspect_ratio_info);/* aspect ratio info */
975  put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.num);
976  put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.den);
977  }
978 
979  if(s->workaround_bugs & FF_BUG_MS) { //
980  put_bits(&s->pb, 1, 0); /* vol control parameters= no @@@ */
981  } else {
982  put_bits(&s->pb, 1, 1); /* vol control parameters= yes */
983  put_bits(&s->pb, 2, 1); /* chroma format YUV 420/YV12 */
984  put_bits(&s->pb, 1, s->low_delay);
985  put_bits(&s->pb, 1, 0); /* vbv parameters= no */
986  }
987 
988  put_bits(&s->pb, 2, RECT_SHAPE); /* vol shape= rectangle */
989  put_bits(&s->pb, 1, 1); /* marker bit */
990 
991  put_bits(&s->pb, 16, s->avctx->time_base.den);
992  if (s->time_increment_bits < 1)
993  s->time_increment_bits = 1;
994  put_bits(&s->pb, 1, 1); /* marker bit */
995  put_bits(&s->pb, 1, 0); /* fixed vop rate=no */
996  put_bits(&s->pb, 1, 1); /* marker bit */
997  put_bits(&s->pb, 13, s->width); /* vol width */
998  put_bits(&s->pb, 1, 1); /* marker bit */
999  put_bits(&s->pb, 13, s->height); /* vol height */
1000  put_bits(&s->pb, 1, 1); /* marker bit */
1001  put_bits(&s->pb, 1, s->progressive_sequence ? 0 : 1);
1002  put_bits(&s->pb, 1, 1); /* obmc disable */
1003  if (vo_ver_id == 1) {
1004  put_bits(&s->pb, 1, s->vol_sprite_usage); /* sprite enable */
1005  }else{
1006  put_bits(&s->pb, 2, s->vol_sprite_usage); /* sprite enable */
1007  }
1008 
1009  put_bits(&s->pb, 1, 0); /* not 8 bit == false */
1010  put_bits(&s->pb, 1, s->mpeg_quant); /* quant type= (0=h263 style)*/
1011 
1012  if(s->mpeg_quant){
1015  }
1016 
1017  if (vo_ver_id != 1)
1018  put_bits(&s->pb, 1, s->quarter_sample);
1019  put_bits(&s->pb, 1, 1); /* complexity estimation disable */
1020  s->resync_marker= s->rtp_mode;
1021  put_bits(&s->pb, 1, s->resync_marker ? 0 : 1);/* resync marker disable */
1022  put_bits(&s->pb, 1, s->data_partitioning ? 1 : 0);
1023  if(s->data_partitioning){
1024  put_bits(&s->pb, 1, 0); /* no rvlc */
1025  }
1026 
1027  if (vo_ver_id != 1){
1028  put_bits(&s->pb, 1, 0); /* newpred */
1029  put_bits(&s->pb, 1, 0); /* reduced res vop */
1030  }
1031  put_bits(&s->pb, 1, 0); /* scalability */
1032 
1033  ff_mpeg4_stuffing(&s->pb);
1034 
1035  /* user data */
1036  if(!(s->flags & CODEC_FLAG_BITEXACT)){
1037  put_bits(&s->pb, 16, 0);
1038  put_bits(&s->pb, 16, 0x1B2); /* user_data */
1040  }
1041 }
1042 
1043 /* write mpeg4 VOP header */
1045 {
1046  int time_incr;
1047  int time_div, time_mod;
1048 
1049  if(s->pict_type==AV_PICTURE_TYPE_I){
1050  if(!(s->flags&CODEC_FLAG_GLOBAL_HEADER)){
1051  if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT) //HACK, the reference sw is buggy
1053  if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT || picture_number==0) //HACK, the reference sw is buggy
1054  mpeg4_encode_vol_header(s, 0, 0);
1055  }
1056  if(!(s->workaround_bugs & FF_BUG_MS))
1058  }
1059 
1061 
1062  put_bits(&s->pb, 16, 0); /* vop header */
1063  put_bits(&s->pb, 16, VOP_STARTCODE); /* vop header */
1064  put_bits(&s->pb, 2, s->pict_type - 1); /* pict type: I = 0 , P = 1 */
1065 
1066  time_div= FFUDIV(s->time, s->avctx->time_base.den);
1067  time_mod= FFUMOD(s->time, s->avctx->time_base.den);
1068  time_incr= time_div - s->last_time_base;
1069  av_assert0(time_incr >= 0);
1070  while(time_incr--)
1071  put_bits(&s->pb, 1, 1);
1072 
1073  put_bits(&s->pb, 1, 0);
1074 
1075  put_bits(&s->pb, 1, 1); /* marker */
1076  put_bits(&s->pb, s->time_increment_bits, time_mod); /* time increment */
1077  put_bits(&s->pb, 1, 1); /* marker */
1078  put_bits(&s->pb, 1, 1); /* vop coded */
1079  if ( s->pict_type == AV_PICTURE_TYPE_P
1081  put_bits(&s->pb, 1, s->no_rounding); /* rounding type */
1082  }
1083  put_bits(&s->pb, 3, 0); /* intra dc VLC threshold */
1084  if(!s->progressive_sequence){
1086  put_bits(&s->pb, 1, s->alternate_scan);
1087  }
1088  //FIXME sprite stuff
1089 
1090  put_bits(&s->pb, 5, s->qscale);
1091 
1092  if (s->pict_type != AV_PICTURE_TYPE_I)
1093  put_bits(&s->pb, 3, s->f_code); /* fcode_for */
1094  if (s->pict_type == AV_PICTURE_TYPE_B)
1095  put_bits(&s->pb, 3, s->b_code); /* fcode_back */
1096 }
1097 
1098 
1099 static av_cold void init_uni_dc_tab(void)
1100 {
1101  int level, uni_code, uni_len;
1102 
1103  for(level=-256; level<256; level++){
1104  int size, v, l;
1105  /* find number of bits */
1106  size = 0;
1107  v = abs(level);
1108  while (v) {
1109  v >>= 1;
1110  size++;
1111  }
1112 
1113  if (level < 0)
1114  l= (-level) ^ ((1 << size) - 1);
1115  else
1116  l= level;
1117 
1118  /* luminance */
1119  uni_code= ff_mpeg4_DCtab_lum[size][0];
1120  uni_len = ff_mpeg4_DCtab_lum[size][1];
1121 
1122  if (size > 0) {
1123  uni_code<<=size; uni_code|=l;
1124  uni_len+=size;
1125  if (size > 8){
1126  uni_code<<=1; uni_code|=1;
1127  uni_len++;
1128  }
1129  }
1130  uni_DCtab_lum_bits[level+256]= uni_code;
1131  uni_DCtab_lum_len [level+256]= uni_len;
1132 
1133  /* chrominance */
1134  uni_code= ff_mpeg4_DCtab_chrom[size][0];
1135  uni_len = ff_mpeg4_DCtab_chrom[size][1];
1136 
1137  if (size > 0) {
1138  uni_code<<=size; uni_code|=l;
1139  uni_len+=size;
1140  if (size > 8){
1141  uni_code<<=1; uni_code|=1;
1142  uni_len++;
1143  }
1144  }
1145  uni_DCtab_chrom_bits[level+256]= uni_code;
1146  uni_DCtab_chrom_len [level+256]= uni_len;
1147 
1148  }
1149 }
1150 
1151 static av_cold void init_uni_mpeg4_rl_tab(RLTable *rl, uint32_t *bits_tab,
1152  uint8_t *len_tab)
1153 {
1154  int slevel, run, last;
1155 
1156  av_assert0(MAX_LEVEL >= 64);
1157  av_assert0(MAX_RUN >= 63);
1158 
1159  for(slevel=-64; slevel<64; slevel++){
1160  if(slevel==0) continue;
1161  for(run=0; run<64; run++){
1162  for(last=0; last<=1; last++){
1163  const int index= UNI_MPEG4_ENC_INDEX(last, run, slevel+64);
1164  int level= slevel < 0 ? -slevel : slevel;
1165  int sign= slevel < 0 ? 1 : 0;
1166  int bits, len, code;
1167  int level1, run1;
1168 
1169  len_tab[index]= 100;
1170 
1171  /* ESC0 */
1172  code= get_rl_index(rl, last, run, level);
1173  bits= rl->table_vlc[code][0];
1174  len= rl->table_vlc[code][1];
1175  bits=bits*2+sign; len++;
1176 
1177  if(code!=rl->n && len < len_tab[index]){
1178  bits_tab[index]= bits;
1179  len_tab [index]= len;
1180  }
1181  /* ESC1 */
1182  bits= rl->table_vlc[rl->n][0];
1183  len= rl->table_vlc[rl->n][1];
1184  bits=bits*2; len++; //esc1
1185  level1= level - rl->max_level[last][run];
1186  if(level1>0){
1187  code= get_rl_index(rl, last, run, level1);
1188  bits<<= rl->table_vlc[code][1];
1189  len += rl->table_vlc[code][1];
1190  bits += rl->table_vlc[code][0];
1191  bits=bits*2+sign; len++;
1192 
1193  if(code!=rl->n && len < len_tab[index]){
1194  bits_tab[index]= bits;
1195  len_tab [index]= len;
1196  }
1197  }
1198  /* ESC2 */
1199  bits= rl->table_vlc[rl->n][0];
1200  len= rl->table_vlc[rl->n][1];
1201  bits=bits*4+2; len+=2; //esc2
1202  run1 = run - rl->max_run[last][level] - 1;
1203  if(run1>=0){
1204  code= get_rl_index(rl, last, run1, level);
1205  bits<<= rl->table_vlc[code][1];
1206  len += rl->table_vlc[code][1];
1207  bits += rl->table_vlc[code][0];
1208  bits=bits*2+sign; len++;
1209 
1210  if(code!=rl->n && len < len_tab[index]){
1211  bits_tab[index]= bits;
1212  len_tab [index]= len;
1213  }
1214  }
1215  /* ESC3 */
1216  bits= rl->table_vlc[rl->n][0];
1217  len = rl->table_vlc[rl->n][1];
1218  bits=bits*4+3; len+=2; //esc3
1219  bits=bits*2+last; len++;
1220  bits=bits*64+run; len+=6;
1221  bits=bits*2+1; len++; //marker
1222  bits=bits*4096+(slevel&0xfff); len+=12;
1223  bits=bits*2+1; len++; //marker
1224 
1225  if(len < len_tab[index]){
1226  bits_tab[index]= bits;
1227  len_tab [index]= len;
1228  }
1229  }
1230  }
1231  }
1232 }
1233 
1235 {
1236  MpegEncContext *s = avctx->priv_data;
1237  int ret;
1238  static int done = 0;
1239 
1240  if (avctx->width >= (1<<13) || avctx->height >= (1<<13)) {
1241  av_log(avctx, AV_LOG_ERROR, "dimensions too large for MPEG-4\n");
1242  return AVERROR(EINVAL);
1243  }
1244 
1245  if((ret=ff_MPV_encode_init(avctx)) < 0)
1246  return ret;
1247 
1248  if (!done) {
1249  done = 1;
1250 
1251  init_uni_dc_tab();
1252 
1254 
1257  }
1258 
1259  s->min_qcoeff= -2048;
1260  s->max_qcoeff= 2047;
1266  s->ac_esc_length= 7+2+1+6+1+12+1;
1269 
1271 
1272  s->avctx->extradata= av_malloc(1024);
1273  init_put_bits(&s->pb, s->avctx->extradata, 1024);
1274 
1275  if(!(s->workaround_bugs & FF_BUG_MS))
1277  mpeg4_encode_vol_header(s, 0, 0);
1278 
1279 // ff_mpeg4_stuffing(&s->pb); ?
1280  flush_put_bits(&s->pb);
1281  s->avctx->extradata_size= (put_bits_count(&s->pb)+7)>>3;
1282  }
1283  return 0;
1284 }
1285 
1287 {
1288  uint8_t *start= put_bits_ptr(&s->pb);
1289  uint8_t *end= s->pb.buf_end;
1290  int size= end - start;
1291  int pb_size = (((intptr_t)start + size/3)&(~3)) - (intptr_t)start;
1292  int tex_size= (size - 2*pb_size)&(~3);
1293 
1294  set_put_bits_buffer_size(&s->pb, pb_size);
1295  init_put_bits(&s->tex_pb, start + pb_size , tex_size);
1296  init_put_bits(&s->pb2 , start + pb_size + tex_size, pb_size);
1297 }
1298 
1300 {
1301  const int pb2_len = put_bits_count(&s->pb2 );
1302  const int tex_pb_len= put_bits_count(&s->tex_pb);
1303  const int bits= put_bits_count(&s->pb);
1304 
1305  if(s->pict_type==AV_PICTURE_TYPE_I){
1306  put_bits(&s->pb, 19, DC_MARKER);
1307  s->misc_bits+=19 + pb2_len + bits - s->last_bits;
1308  s->i_tex_bits+= tex_pb_len;
1309  }else{
1310  put_bits(&s->pb, 17, MOTION_MARKER);
1311  s->misc_bits+=17 + pb2_len;
1312  s->mv_bits+= bits - s->last_bits;
1313  s->p_tex_bits+= tex_pb_len;
1314  }
1315 
1316  flush_put_bits(&s->pb2);
1317  flush_put_bits(&s->tex_pb);
1318 
1319  set_put_bits_buffer_size(&s->pb, s->pb2.buf_end - s->pb.buf);
1320  avpriv_copy_bits(&s->pb, s->pb2.buf , pb2_len);
1321  avpriv_copy_bits(&s->pb, s->tex_pb.buf, tex_pb_len);
1322  s->last_bits= put_bits_count(&s->pb);
1323 }
1324 
1325 
1327 {
1328  int mb_num_bits= av_log2(s->mb_num - 1) + 1;
1329 
1331  put_bits(&s->pb, 1, 1);
1332 
1333  put_bits(&s->pb, mb_num_bits, s->mb_x + s->mb_y*s->mb_width);
1334  put_bits(&s->pb, s->quant_precision, s->qscale);
1335  put_bits(&s->pb, 1, 0); /* no HEC */
1336 }
1337 
1338 #define OFFSET(x) offsetof(MpegEncContext, x)
1339 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
1340 static const AVOption options[] = {
1341  { "data_partitioning", "Use data partitioning.", OFFSET(data_partitioning), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1342  { "alternate_scan", "Enable alternate scantable.", OFFSET(alternate_scan), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1344  { NULL },
1345 };
1346 
1347 static const AVClass mpeg4enc_class = {
1348  .class_name = "MPEG4 encoder",
1349  .item_name = av_default_item_name,
1350  .option = options,
1351  .version = LIBAVUTIL_VERSION_INT,
1352 };
1353 
1355  .name = "mpeg4",
1356  .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
1357  .type = AVMEDIA_TYPE_VIDEO,
1358  .id = AV_CODEC_ID_MPEG4,
1359  .priv_data_size = sizeof(MpegEncContext),
1360  .init = encode_init,
1361  .encode2 = ff_MPV_encode_picture,
1363  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
1364  .capabilities = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1365  .priv_class = &mpeg4enc_class,
1366 };