Merge remote-tracking branch 'qatar/master'
[ffmpeg.git] / libavcodec / mpeg4videoenc.c
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.
32 static uint8_t uni_DCtab_lum_len[512];
33 static uint8_t uni_DCtab_chrom_len[512];
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, DCTELEM 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 refering to the last non zero coefficient in zigzag order
93  */
94 static inline void restore_ac_coeffs(MpegEncContext * s, DCTELEM 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 refering to the last non zero coefficient in zigzag order
124  */
125 static inline int decide_ac_pred(MpegEncContext * s, DCTELEM 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 acually possible in mpeg4
203  */
204 void ff_clean_mpeg4_qscales(MpegEncContext *s){
205     int i;
206     int8_t * const qscale_table = s->current_picture.f.qscale_table;
207
208     ff_clean_h263_qscales(s);
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  * encodes 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 */
254         put_bits(s, uni_DCtab_chrom_len[level], uni_DCtab_chrom_bits[level]);
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  * encodes a 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, DCTELEM * 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, DCTELEM * 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, DCTELEM 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++) {
417                 skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, 0, s->intra_scantable.permutated));
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, DCTELEM block[6][64],
429                             int motion_x, int motion_y, int mb_type)
430 {
431     int cbp = 0, i;
432
433     if (s->flags & CODEC_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
471 void mpeg4_encode_mb(MpegEncContext * s,
472                     DCTELEM 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
484         if(s->pict_type==AV_PICTURE_TYPE_B){
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             assert(s->dquant>=-2 && s->dquant<=2);
498             assert((s->dquant&1)==0);
499             assert(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                 assert(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){
556                 assert(s->mv_dir & MV_DIRECT);
557                 ff_h263_encode_motion_vector(s, motion_x, motion_y, 1);
558                 s->b_count++;
559                 s->f_count++;
560             }else{
561                 assert(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,
690                         ff_h263_inter_MCBPC_bits[cbpc],
691                         ff_h263_inter_MCBPC_code[cbpc]);
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                 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,
715                         ff_h263_inter_MCBPC_bits[cbpc],
716                         ff_h263_inter_MCBPC_code[cbpc]);
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
722                 assert(!s->progressive_sequence);
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                 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{
743                 assert(s->mv_type==MV_TYPE_8X8);
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                     h263_pred_motion(s, i, 0, &pred_x, &pred_y);
761
762                     ff_h263_encode_motion_vector(s, s->current_picture.f.motion_val[0][ s->block_index[i] ][0] - pred_x,
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,
808                 ff_h263_intra_MCBPC_bits[cbpc],
809                 ff_h263_intra_MCBPC_code[cbpc]);
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  */
847 void ff_mpeg4_stuffing(PutBitContext * pbc)
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 */
856 void ff_set_mpeg4_time(MpegEncContext * s){
857     if(s->pict_type==AV_PICTURE_TYPE_B){
858         ff_mpeg4_init_direct_mv(s);
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
865 static void mpeg4_encode_gop_header(MpegEncContext * s){
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
894 static void mpeg4_encode_visual_object_header(MpegEncContext * s){
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;
947         s->vo_type= ADV_SIMPLE_VO_TYPE;
948     }else{
949         vo_ver_id= 1;
950         s->vo_type= SIMPLE_VO_TYPE;
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
968     s->aspect_ratio_info= ff_h263_aspect_to_info(s->avctx->sample_aspect_ratio);
969
970     put_bits(&s->pb, 4, s->aspect_ratio_info);/* aspect ratio info */
971     if (s->aspect_ratio_info == FF_ASPECT_EXTENDED){
972         put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.num);
973         put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.den);
974     }
975
976     if(s->workaround_bugs & FF_BUG_MS) { //
977         put_bits(&s->pb, 1, 0);         /* vol control parameters= no @@@ */
978     } else {
979         put_bits(&s->pb, 1, 1);         /* vol control parameters= yes */
980         put_bits(&s->pb, 2, 1);         /* chroma format YUV 420/YV12 */
981         put_bits(&s->pb, 1, s->low_delay);
982         put_bits(&s->pb, 1, 0);         /* vbv parameters= no */
983     }
984
985     put_bits(&s->pb, 2, RECT_SHAPE);    /* vol shape= rectangle */
986     put_bits(&s->pb, 1, 1);             /* marker bit */
987
988     put_bits(&s->pb, 16, s->avctx->time_base.den);
989     if (s->time_increment_bits < 1)
990         s->time_increment_bits = 1;
991     put_bits(&s->pb, 1, 1);             /* marker bit */
992     put_bits(&s->pb, 1, 0);             /* fixed vop rate=no */
993     put_bits(&s->pb, 1, 1);             /* marker bit */
994     put_bits(&s->pb, 13, s->width);     /* vol width */
995     put_bits(&s->pb, 1, 1);             /* marker bit */
996     put_bits(&s->pb, 13, s->height);    /* vol height */
997     put_bits(&s->pb, 1, 1);             /* marker bit */
998     put_bits(&s->pb, 1, s->progressive_sequence ? 0 : 1);
999     put_bits(&s->pb, 1, 1);             /* obmc disable */
1000     if (vo_ver_id == 1) {
1001         put_bits(&s->pb, 1, s->vol_sprite_usage);       /* sprite enable */
1002     }else{
1003         put_bits(&s->pb, 2, s->vol_sprite_usage);       /* sprite enable */
1004     }
1005
1006     put_bits(&s->pb, 1, 0);             /* not 8 bit == false */
1007     put_bits(&s->pb, 1, s->mpeg_quant); /* quant type= (0=h263 style)*/
1008
1009     if(s->mpeg_quant){
1010         ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
1011         ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
1012     }
1013
1014     if (vo_ver_id != 1)
1015         put_bits(&s->pb, 1, s->quarter_sample);
1016     put_bits(&s->pb, 1, 1);             /* complexity estimation disable */
1017     s->resync_marker= s->rtp_mode;
1018     put_bits(&s->pb, 1, s->resync_marker ? 0 : 1);/* resync marker disable */
1019     put_bits(&s->pb, 1, s->data_partitioning ? 1 : 0);
1020     if(s->data_partitioning){
1021         put_bits(&s->pb, 1, 0);         /* no rvlc */
1022     }
1023
1024     if (vo_ver_id != 1){
1025         put_bits(&s->pb, 1, 0);         /* newpred */
1026         put_bits(&s->pb, 1, 0);         /* reduced res vop */
1027     }
1028     put_bits(&s->pb, 1, 0);             /* scalability */
1029
1030     ff_mpeg4_stuffing(&s->pb);
1031
1032     /* user data */
1033     if(!(s->flags & CODEC_FLAG_BITEXACT)){
1034         put_bits(&s->pb, 16, 0);
1035         put_bits(&s->pb, 16, 0x1B2);    /* user_data */
1036         ff_put_string(&s->pb, LIBAVCODEC_IDENT, 0);
1037     }
1038 }
1039
1040 /* write mpeg4 VOP header */
1041 void mpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
1042 {
1043     int time_incr;
1044     int time_div, time_mod;
1045
1046     if(s->pict_type==AV_PICTURE_TYPE_I){
1047         if(!(s->flags&CODEC_FLAG_GLOBAL_HEADER)){
1048             if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT) //HACK, the reference sw is buggy
1049                 mpeg4_encode_visual_object_header(s);
1050             if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT || picture_number==0) //HACK, the reference sw is buggy
1051                 mpeg4_encode_vol_header(s, 0, 0);
1052         }
1053         if(!(s->workaround_bugs & FF_BUG_MS))
1054             mpeg4_encode_gop_header(s);
1055     }
1056
1057     s->partitioned_frame= s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B;
1058
1059     put_bits(&s->pb, 16, 0);                /* vop header */
1060     put_bits(&s->pb, 16, VOP_STARTCODE);    /* vop header */
1061     put_bits(&s->pb, 2, s->pict_type - 1);  /* pict type: I = 0 , P = 1 */
1062
1063     time_div= FFUDIV(s->time, s->avctx->time_base.den);
1064     time_mod= FFUMOD(s->time, s->avctx->time_base.den);
1065     time_incr= time_div - s->last_time_base;
1066     assert(time_incr >= 0);
1067     while(time_incr--)
1068         put_bits(&s->pb, 1, 1);
1069
1070     put_bits(&s->pb, 1, 0);
1071
1072     put_bits(&s->pb, 1, 1);                             /* marker */
1073     put_bits(&s->pb, s->time_increment_bits, time_mod); /* time increment */
1074     put_bits(&s->pb, 1, 1);                             /* marker */
1075     put_bits(&s->pb, 1, 1);                             /* vop coded */
1076     if (    s->pict_type == AV_PICTURE_TYPE_P
1077         || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE)) {
1078         put_bits(&s->pb, 1, s->no_rounding);    /* rounding type */
1079     }
1080     put_bits(&s->pb, 3, 0);     /* intra dc VLC threshold */
1081     if(!s->progressive_sequence){
1082          put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
1083          put_bits(&s->pb, 1, s->alternate_scan);
1084     }
1085     //FIXME sprite stuff
1086
1087     put_bits(&s->pb, 5, s->qscale);
1088
1089     if (s->pict_type != AV_PICTURE_TYPE_I)
1090         put_bits(&s->pb, 3, s->f_code); /* fcode_for */
1091     if (s->pict_type == AV_PICTURE_TYPE_B)
1092         put_bits(&s->pb, 3, s->b_code); /* fcode_back */
1093 }
1094
1095
1096 static void init_uni_dc_tab(void)
1097 {
1098     int level, uni_code, uni_len;
1099
1100     for(level=-256; level<256; level++){
1101         int size, v, l;
1102         /* find number of bits */
1103         size = 0;
1104         v = abs(level);
1105         while (v) {
1106             v >>= 1;
1107             size++;
1108         }
1109
1110         if (level < 0)
1111             l= (-level) ^ ((1 << size) - 1);
1112         else
1113             l= level;
1114
1115         /* luminance */
1116         uni_code= ff_mpeg4_DCtab_lum[size][0];
1117         uni_len = ff_mpeg4_DCtab_lum[size][1];
1118
1119         if (size > 0) {
1120             uni_code<<=size; uni_code|=l;
1121             uni_len+=size;
1122             if (size > 8){
1123                 uni_code<<=1; uni_code|=1;
1124                 uni_len++;
1125             }
1126         }
1127         uni_DCtab_lum_bits[level+256]= uni_code;
1128         uni_DCtab_lum_len [level+256]= uni_len;
1129
1130         /* chrominance */
1131         uni_code= ff_mpeg4_DCtab_chrom[size][0];
1132         uni_len = ff_mpeg4_DCtab_chrom[size][1];
1133
1134         if (size > 0) {
1135             uni_code<<=size; uni_code|=l;
1136             uni_len+=size;
1137             if (size > 8){
1138                 uni_code<<=1; uni_code|=1;
1139                 uni_len++;
1140             }
1141         }
1142         uni_DCtab_chrom_bits[level+256]= uni_code;
1143         uni_DCtab_chrom_len [level+256]= uni_len;
1144
1145     }
1146 }
1147
1148 static void init_uni_mpeg4_rl_tab(RLTable *rl, uint32_t *bits_tab, uint8_t *len_tab){
1149     int slevel, run, last;
1150
1151     assert(MAX_LEVEL >= 64);
1152     assert(MAX_RUN   >= 63);
1153
1154     for(slevel=-64; slevel<64; slevel++){
1155         if(slevel==0) continue;
1156         for(run=0; run<64; run++){
1157             for(last=0; last<=1; last++){
1158                 const int index= UNI_MPEG4_ENC_INDEX(last, run, slevel+64);
1159                 int level= slevel < 0 ? -slevel : slevel;
1160                 int sign= slevel < 0 ? 1 : 0;
1161                 int bits, len, code;
1162                 int level1, run1;
1163
1164                 len_tab[index]= 100;
1165
1166                 /* ESC0 */
1167                 code= get_rl_index(rl, last, run, level);
1168                 bits= rl->table_vlc[code][0];
1169                 len=  rl->table_vlc[code][1];
1170                 bits=bits*2+sign; len++;
1171
1172                 if(code!=rl->n && len < len_tab[index]){
1173                     bits_tab[index]= bits;
1174                     len_tab [index]= len;
1175                 }
1176                 /* ESC1 */
1177                 bits= rl->table_vlc[rl->n][0];
1178                 len=  rl->table_vlc[rl->n][1];
1179                 bits=bits*2;    len++; //esc1
1180                 level1= level - rl->max_level[last][run];
1181                 if(level1>0){
1182                     code= get_rl_index(rl, last, run, level1);
1183                     bits<<= rl->table_vlc[code][1];
1184                     len  += rl->table_vlc[code][1];
1185                     bits += rl->table_vlc[code][0];
1186                     bits=bits*2+sign; len++;
1187
1188                     if(code!=rl->n && len < len_tab[index]){
1189                         bits_tab[index]= bits;
1190                         len_tab [index]= len;
1191                     }
1192                 }
1193                 /* ESC2 */
1194                 bits= rl->table_vlc[rl->n][0];
1195                 len=  rl->table_vlc[rl->n][1];
1196                 bits=bits*4+2;    len+=2; //esc2
1197                 run1 = run - rl->max_run[last][level] - 1;
1198                 if(run1>=0){
1199                     code= get_rl_index(rl, last, run1, level);
1200                     bits<<= rl->table_vlc[code][1];
1201                     len  += rl->table_vlc[code][1];
1202                     bits += rl->table_vlc[code][0];
1203                     bits=bits*2+sign; len++;
1204
1205                     if(code!=rl->n && len < len_tab[index]){
1206                         bits_tab[index]= bits;
1207                         len_tab [index]= len;
1208                     }
1209                 }
1210                 /* ESC3 */
1211                 bits= rl->table_vlc[rl->n][0];
1212                 len = rl->table_vlc[rl->n][1];
1213                 bits=bits*4+3;    len+=2; //esc3
1214                 bits=bits*2+last; len++;
1215                 bits=bits*64+run; len+=6;
1216                 bits=bits*2+1;    len++;  //marker
1217                 bits=bits*4096+(slevel&0xfff); len+=12;
1218                 bits=bits*2+1;    len++;  //marker
1219
1220                 if(len < len_tab[index]){
1221                     bits_tab[index]= bits;
1222                     len_tab [index]= len;
1223                 }
1224             }
1225         }
1226     }
1227 }
1228
1229 static av_cold int encode_init(AVCodecContext *avctx)
1230 {
1231     MpegEncContext *s = avctx->priv_data;
1232     int ret;
1233     static int done = 0;
1234
1235     if((ret=MPV_encode_init(avctx)) < 0)
1236         return ret;
1237
1238     if (!done) {
1239         done = 1;
1240
1241         init_uni_dc_tab();
1242
1243         init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
1244
1245         init_uni_mpeg4_rl_tab(&ff_mpeg4_rl_intra, uni_mpeg4_intra_rl_bits, uni_mpeg4_intra_rl_len);
1246         init_uni_mpeg4_rl_tab(&ff_h263_rl_inter, uni_mpeg4_inter_rl_bits, uni_mpeg4_inter_rl_len);
1247     }
1248
1249     s->min_qcoeff= -2048;
1250     s->max_qcoeff=  2047;
1251     s->intra_ac_vlc_length     = uni_mpeg4_intra_rl_len;
1252     s->intra_ac_vlc_last_length= uni_mpeg4_intra_rl_len + 128*64;
1253     s->inter_ac_vlc_length     = uni_mpeg4_inter_rl_len;
1254     s->inter_ac_vlc_last_length= uni_mpeg4_inter_rl_len + 128*64;
1255     s->luma_dc_vlc_length= uni_DCtab_lum_len;
1256     s->ac_esc_length= 7+2+1+6+1+12+1;
1257     s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table;
1258     s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
1259
1260     if(s->flags & CODEC_FLAG_GLOBAL_HEADER){
1261
1262         s->avctx->extradata= av_malloc(1024);
1263         init_put_bits(&s->pb, s->avctx->extradata, 1024);
1264
1265         if(!(s->workaround_bugs & FF_BUG_MS))
1266             mpeg4_encode_visual_object_header(s);
1267         mpeg4_encode_vol_header(s, 0, 0);
1268
1269 //            ff_mpeg4_stuffing(&s->pb); ?
1270         flush_put_bits(&s->pb);
1271         s->avctx->extradata_size= (put_bits_count(&s->pb)+7)>>3;
1272     }
1273     return 0;
1274 }
1275
1276 void ff_mpeg4_init_partitions(MpegEncContext *s)
1277 {
1278     uint8_t *start= put_bits_ptr(&s->pb);
1279     uint8_t *end= s->pb.buf_end;
1280     int size= end - start;
1281     int pb_size = (((intptr_t)start + size/3)&(~3)) - (intptr_t)start;
1282     int tex_size= (size - 2*pb_size)&(~3);
1283
1284     set_put_bits_buffer_size(&s->pb, pb_size);
1285     init_put_bits(&s->tex_pb, start + pb_size           , tex_size);
1286     init_put_bits(&s->pb2   , start + pb_size + tex_size, pb_size);
1287 }
1288
1289 void ff_mpeg4_merge_partitions(MpegEncContext *s)
1290 {
1291     const int pb2_len   = put_bits_count(&s->pb2   );
1292     const int tex_pb_len= put_bits_count(&s->tex_pb);
1293     const int bits= put_bits_count(&s->pb);
1294
1295     if(s->pict_type==AV_PICTURE_TYPE_I){
1296         put_bits(&s->pb, 19, DC_MARKER);
1297         s->misc_bits+=19 + pb2_len + bits - s->last_bits;
1298         s->i_tex_bits+= tex_pb_len;
1299     }else{
1300         put_bits(&s->pb, 17, MOTION_MARKER);
1301         s->misc_bits+=17 + pb2_len;
1302         s->mv_bits+= bits - s->last_bits;
1303         s->p_tex_bits+= tex_pb_len;
1304     }
1305
1306     flush_put_bits(&s->pb2);
1307     flush_put_bits(&s->tex_pb);
1308
1309     set_put_bits_buffer_size(&s->pb, s->pb2.buf_end - s->pb.buf);
1310     avpriv_copy_bits(&s->pb, s->pb2.buf   , pb2_len);
1311     avpriv_copy_bits(&s->pb, s->tex_pb.buf, tex_pb_len);
1312     s->last_bits= put_bits_count(&s->pb);
1313 }
1314
1315
1316 void ff_mpeg4_encode_video_packet_header(MpegEncContext *s)
1317 {
1318     int mb_num_bits= av_log2(s->mb_num - 1) + 1;
1319
1320     put_bits(&s->pb, ff_mpeg4_get_video_packet_prefix_length(s), 0);
1321     put_bits(&s->pb, 1, 1);
1322
1323     put_bits(&s->pb, mb_num_bits, s->mb_x + s->mb_y*s->mb_width);
1324     put_bits(&s->pb, s->quant_precision, s->qscale);
1325     put_bits(&s->pb, 1, 0); /* no HEC */
1326 }
1327
1328 #define OFFSET(x) offsetof(MpegEncContext, x)
1329 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
1330 static const AVOption options[] = {
1331     { "data_partitioning",       "Use data partitioning.",      OFFSET(data_partitioning), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
1332     { "alternate_scan",          "Enable alternate scantable.", OFFSET(alternate_scan),    AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
1333     { NULL },
1334 };
1335
1336 static const AVClass mpeg4enc_class = {
1337     .class_name = "MPEG4 encoder",
1338     .item_name  = av_default_item_name,
1339     .option     = options,
1340     .version    = LIBAVUTIL_VERSION_INT,
1341 };
1342
1343 AVCodec ff_mpeg4_encoder = {
1344     .name           = "mpeg4",
1345     .type           = AVMEDIA_TYPE_VIDEO,
1346     .id             = CODEC_ID_MPEG4,
1347     .priv_data_size = sizeof(MpegEncContext),
1348     .init           = encode_init,
1349     .encode         = MPV_encode_picture,
1350     .close          = MPV_encode_end,
1351     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
1352     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1353     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
1354     .priv_class     = &mpeg4enc_class,
1355 };