lavc: move get_b_cbp() from h263.h to mpeg4videoenc.c
[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 Libav.
7  *
8  * Libav 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  * Libav 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 Libav; 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                     if(x+16 > s->width)  x= s->width-16;
631                     if(y+16 > s->height) y= s->height-16;
632
633                     offset= x + y*s->linesize;
634                     p_pic = s->new_picture.f.data[0] + offset;
635
636                     s->mb_skipped=1;
637                     for(i=0; i<s->max_b_frames; i++){
638                         uint8_t *b_pic;
639                         int diff;
640                         Picture *pic= s->reordered_input_picture[i+1];
641
642                         if (pic == NULL || pic->f.pict_type != AV_PICTURE_TYPE_B)
643                             break;
644
645                         b_pic = pic->f.data[0] + offset;
646                         if (pic->f.type != FF_BUFFER_TYPE_SHARED)
647                             b_pic+= INPLACE_OFFSET;
648                         diff= s->dsp.sad[0](NULL, p_pic, b_pic, s->linesize, 16);
649                         if(diff>s->qscale*70){ //FIXME check that 70 is optimal
650                             s->mb_skipped=0;
651                             break;
652                         }
653                     }
654                 }else
655                     s->mb_skipped=1;
656
657                 if(s->mb_skipped==1){
658                     /* skip macroblock */
659                     put_bits(&s->pb, 1, 1);
660
661                     if(interleaved_stats){
662                         s->misc_bits++;
663                         s->last_bits++;
664                     }
665                     s->skip_count++;
666
667                     return;
668                 }
669             }
670
671             put_bits(&s->pb, 1, 0);     /* mb coded */
672             cbpc = cbp & 3;
673             cbpy = cbp >> 2;
674             cbpy ^= 0xf;
675             if(s->mv_type==MV_TYPE_16X16){
676                 if(s->dquant) cbpc+= 8;
677                 put_bits(&s->pb,
678                         ff_h263_inter_MCBPC_bits[cbpc],
679                         ff_h263_inter_MCBPC_code[cbpc]);
680
681                 put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
682                 if(s->dquant)
683                     put_bits(pb2, 2, dquant_code[s->dquant+2]);
684
685                 if(!s->progressive_sequence){
686                     if(cbp)
687                         put_bits(pb2, 1, s->interlaced_dct);
688                     put_bits(pb2, 1, 0);
689                 }
690
691                 if(interleaved_stats){
692                     s->misc_bits+= get_bits_diff(s);
693                 }
694
695                 /* motion vectors: 16x16 mode */
696                 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
697
698                 ff_h263_encode_motion_vector(s, motion_x - pred_x,
699                                                 motion_y - pred_y, s->f_code);
700             }else if(s->mv_type==MV_TYPE_FIELD){
701                 if(s->dquant) cbpc+= 8;
702                 put_bits(&s->pb,
703                         ff_h263_inter_MCBPC_bits[cbpc],
704                         ff_h263_inter_MCBPC_code[cbpc]);
705
706                 put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
707                 if(s->dquant)
708                     put_bits(pb2, 2, dquant_code[s->dquant+2]);
709
710                 assert(!s->progressive_sequence);
711                 if(cbp)
712                     put_bits(pb2, 1, s->interlaced_dct);
713                 put_bits(pb2, 1, 1);
714
715                 if(interleaved_stats){
716                     s->misc_bits+= get_bits_diff(s);
717                 }
718
719                 /* motion vectors: 16x8 interlaced mode */
720                 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
721                 pred_y /=2;
722
723                 put_bits(&s->pb, 1, s->field_select[0][0]);
724                 put_bits(&s->pb, 1, s->field_select[0][1]);
725
726                 ff_h263_encode_motion_vector(s, s->mv[0][0][0] - pred_x,
727                                                 s->mv[0][0][1] - pred_y, s->f_code);
728                 ff_h263_encode_motion_vector(s, s->mv[0][1][0] - pred_x,
729                                                 s->mv[0][1][1] - pred_y, s->f_code);
730             }else{
731                 assert(s->mv_type==MV_TYPE_8X8);
732                 put_bits(&s->pb,
733                         ff_h263_inter_MCBPC_bits[cbpc+16],
734                         ff_h263_inter_MCBPC_code[cbpc+16]);
735                 put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
736
737                 if(!s->progressive_sequence){
738                     if(cbp)
739                         put_bits(pb2, 1, s->interlaced_dct);
740                 }
741
742                 if(interleaved_stats){
743                     s->misc_bits+= get_bits_diff(s);
744                 }
745
746                 for(i=0; i<4; i++){
747                     /* motion vectors: 8x8 mode*/
748                     h263_pred_motion(s, i, 0, &pred_x, &pred_y);
749
750                     ff_h263_encode_motion_vector(s, s->current_picture.f.motion_val[0][ s->block_index[i] ][0] - pred_x,
751                                                     s->current_picture.f.motion_val[0][ s->block_index[i] ][1] - pred_y, s->f_code);
752                 }
753             }
754
755             if(interleaved_stats){
756                 s->mv_bits+= get_bits_diff(s);
757             }
758
759             mpeg4_encode_blocks(s, block, NULL, NULL, NULL, tex_pb);
760
761             if(interleaved_stats){
762                 s->p_tex_bits+= get_bits_diff(s);
763             }
764             s->f_count++;
765         }
766     } else {
767         int cbp;
768         int dc_diff[6];   //dc values with the dc prediction subtracted
769         int dir[6];  //prediction direction
770         int zigzag_last_index[6];
771         uint8_t *scan_table[6];
772         int i;
773
774         for(i=0; i<6; i++){
775             dc_diff[i]= ff_mpeg4_pred_dc(s, i, block[i][0], &dir[i], 1);
776         }
777
778         if(s->flags & CODEC_FLAG_AC_PRED){
779             s->ac_pred= decide_ac_pred(s, block, dir, scan_table, zigzag_last_index);
780         }else{
781             for(i=0; i<6; i++)
782                 scan_table[i]= s->intra_scantable.permutated;
783         }
784
785         /* compute cbp */
786         cbp = 0;
787         for (i = 0; i < 6; i++) {
788             if (s->block_last_index[i] >= 1)
789                 cbp |= 1 << (5 - i);
790         }
791
792         cbpc = cbp & 3;
793         if (s->pict_type == AV_PICTURE_TYPE_I) {
794             if(s->dquant) cbpc+=4;
795             put_bits(&s->pb,
796                 ff_h263_intra_MCBPC_bits[cbpc],
797                 ff_h263_intra_MCBPC_code[cbpc]);
798         } else {
799             if(s->dquant) cbpc+=8;
800             put_bits(&s->pb, 1, 0);     /* mb coded */
801             put_bits(&s->pb,
802                 ff_h263_inter_MCBPC_bits[cbpc + 4],
803                 ff_h263_inter_MCBPC_code[cbpc + 4]);
804         }
805         put_bits(pb2, 1, s->ac_pred);
806         cbpy = cbp >> 2;
807         put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
808         if(s->dquant)
809             put_bits(dc_pb, 2, dquant_code[s->dquant+2]);
810
811         if(!s->progressive_sequence){
812             put_bits(dc_pb, 1, s->interlaced_dct);
813         }
814
815         if(interleaved_stats){
816             s->misc_bits+= get_bits_diff(s);
817         }
818
819         mpeg4_encode_blocks(s, block, dc_diff, scan_table, dc_pb, tex_pb);
820
821         if(interleaved_stats){
822             s->i_tex_bits+= get_bits_diff(s);
823         }
824         s->i_count++;
825
826         /* restore ac coeffs & last_index stuff if we messed them up with the prediction */
827         if(s->ac_pred)
828             restore_ac_coeffs(s, block, dir, scan_table, zigzag_last_index);
829     }
830 }
831
832 /**
833  * add mpeg4 stuffing bits (01...1)
834  */
835 void ff_mpeg4_stuffing(PutBitContext * pbc)
836 {
837     int length;
838     put_bits(pbc, 1, 0);
839     length= (-put_bits_count(pbc))&7;
840     if(length) put_bits(pbc, length, (1<<length)-1);
841 }
842
843 /* must be called before writing the header */
844 void ff_set_mpeg4_time(MpegEncContext * s){
845     if(s->pict_type==AV_PICTURE_TYPE_B){
846         ff_mpeg4_init_direct_mv(s);
847     }else{
848         s->last_time_base= s->time_base;
849         s->time_base= s->time/s->avctx->time_base.den;
850     }
851 }
852
853 static void mpeg4_encode_gop_header(MpegEncContext * s){
854     int hours, minutes, seconds;
855     int64_t time;
856
857     put_bits(&s->pb, 16, 0);
858     put_bits(&s->pb, 16, GOP_STARTCODE);
859
860     time = s->current_picture_ptr->f.pts;
861     if(s->reordered_input_picture[1])
862         time = FFMIN(time, s->reordered_input_picture[1]->f.pts);
863     time= time*s->avctx->time_base.num;
864
865     seconds= time/s->avctx->time_base.den;
866     minutes= seconds/60; seconds %= 60;
867     hours= minutes/60; minutes %= 60;
868     hours%=24;
869
870     put_bits(&s->pb, 5, hours);
871     put_bits(&s->pb, 6, minutes);
872     put_bits(&s->pb, 1, 1);
873     put_bits(&s->pb, 6, seconds);
874
875     put_bits(&s->pb, 1, !!(s->flags&CODEC_FLAG_CLOSED_GOP));
876     put_bits(&s->pb, 1, 0); //broken link == NO
877
878     s->last_time_base= time / s->avctx->time_base.den;
879
880     ff_mpeg4_stuffing(&s->pb);
881 }
882
883 static void mpeg4_encode_visual_object_header(MpegEncContext * s){
884     int profile_and_level_indication;
885     int vo_ver_id;
886
887     if(s->avctx->profile != FF_PROFILE_UNKNOWN){
888         profile_and_level_indication = s->avctx->profile << 4;
889     }else if(s->max_b_frames || s->quarter_sample){
890         profile_and_level_indication= 0xF0; // adv simple
891     }else{
892         profile_and_level_indication= 0x00; // simple
893     }
894
895     if(s->avctx->level != FF_LEVEL_UNKNOWN){
896         profile_and_level_indication |= s->avctx->level;
897     }else{
898         profile_and_level_indication |= 1; //level 1
899     }
900
901     if(profile_and_level_indication>>4 == 0xF){
902         vo_ver_id= 5;
903     }else{
904         vo_ver_id= 1;
905     }
906
907     //FIXME levels
908
909     put_bits(&s->pb, 16, 0);
910     put_bits(&s->pb, 16, VOS_STARTCODE);
911
912     put_bits(&s->pb, 8, profile_and_level_indication);
913
914     put_bits(&s->pb, 16, 0);
915     put_bits(&s->pb, 16, VISUAL_OBJ_STARTCODE);
916
917     put_bits(&s->pb, 1, 1);
918         put_bits(&s->pb, 4, vo_ver_id);
919         put_bits(&s->pb, 3, 1); //priority
920
921     put_bits(&s->pb, 4, 1); //visual obj type== video obj
922
923     put_bits(&s->pb, 1, 0); //video signal type == no clue //FIXME
924
925     ff_mpeg4_stuffing(&s->pb);
926 }
927
928 static void mpeg4_encode_vol_header(MpegEncContext * s, int vo_number, int vol_number)
929 {
930     int vo_ver_id;
931
932     if (!CONFIG_MPEG4_ENCODER)  return;
933
934     if(s->max_b_frames || s->quarter_sample){
935         vo_ver_id= 5;
936         s->vo_type= ADV_SIMPLE_VO_TYPE;
937     }else{
938         vo_ver_id= 1;
939         s->vo_type= SIMPLE_VO_TYPE;
940     }
941
942     put_bits(&s->pb, 16, 0);
943     put_bits(&s->pb, 16, 0x100 + vo_number);        /* video obj */
944     put_bits(&s->pb, 16, 0);
945     put_bits(&s->pb, 16, 0x120 + vol_number);       /* video obj layer */
946
947     put_bits(&s->pb, 1, 0);             /* random access vol */
948     put_bits(&s->pb, 8, s->vo_type);    /* video obj type indication */
949     if(s->workaround_bugs & FF_BUG_MS) {
950         put_bits(&s->pb, 1, 0);         /* is obj layer id= no */
951     } else {
952         put_bits(&s->pb, 1, 1);         /* is obj layer id= yes */
953         put_bits(&s->pb, 4, vo_ver_id); /* is obj layer ver id */
954         put_bits(&s->pb, 3, 1);         /* is obj layer priority */
955     }
956
957     s->aspect_ratio_info= ff_h263_aspect_to_info(s->avctx->sample_aspect_ratio);
958
959     put_bits(&s->pb, 4, s->aspect_ratio_info);/* aspect ratio info */
960     if (s->aspect_ratio_info == FF_ASPECT_EXTENDED){
961         put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.num);
962         put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.den);
963     }
964
965     if(s->workaround_bugs & FF_BUG_MS) { //
966         put_bits(&s->pb, 1, 0);         /* vol control parameters= no @@@ */
967     } else {
968         put_bits(&s->pb, 1, 1);         /* vol control parameters= yes */
969         put_bits(&s->pb, 2, 1);         /* chroma format YUV 420/YV12 */
970         put_bits(&s->pb, 1, s->low_delay);
971         put_bits(&s->pb, 1, 0);         /* vbv parameters= no */
972     }
973
974     put_bits(&s->pb, 2, RECT_SHAPE);    /* vol shape= rectangle */
975     put_bits(&s->pb, 1, 1);             /* marker bit */
976
977     put_bits(&s->pb, 16, s->avctx->time_base.den);
978     if (s->time_increment_bits < 1)
979         s->time_increment_bits = 1;
980     put_bits(&s->pb, 1, 1);             /* marker bit */
981     put_bits(&s->pb, 1, 0);             /* fixed vop rate=no */
982     put_bits(&s->pb, 1, 1);             /* marker bit */
983     put_bits(&s->pb, 13, s->width);     /* vol width */
984     put_bits(&s->pb, 1, 1);             /* marker bit */
985     put_bits(&s->pb, 13, s->height);    /* vol height */
986     put_bits(&s->pb, 1, 1);             /* marker bit */
987     put_bits(&s->pb, 1, s->progressive_sequence ? 0 : 1);
988     put_bits(&s->pb, 1, 1);             /* obmc disable */
989     if (vo_ver_id == 1) {
990         put_bits(&s->pb, 1, s->vol_sprite_usage);       /* sprite enable */
991     }else{
992         put_bits(&s->pb, 2, s->vol_sprite_usage);       /* sprite enable */
993     }
994
995     put_bits(&s->pb, 1, 0);             /* not 8 bit == false */
996     put_bits(&s->pb, 1, s->mpeg_quant); /* quant type= (0=h263 style)*/
997
998     if(s->mpeg_quant){
999         ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
1000         ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
1001     }
1002
1003     if (vo_ver_id != 1)
1004         put_bits(&s->pb, 1, s->quarter_sample);
1005     put_bits(&s->pb, 1, 1);             /* complexity estimation disable */
1006     s->resync_marker= s->rtp_mode;
1007     put_bits(&s->pb, 1, s->resync_marker ? 0 : 1);/* resync marker disable */
1008     put_bits(&s->pb, 1, s->data_partitioning ? 1 : 0);
1009     if(s->data_partitioning){
1010         put_bits(&s->pb, 1, 0);         /* no rvlc */
1011     }
1012
1013     if (vo_ver_id != 1){
1014         put_bits(&s->pb, 1, 0);         /* newpred */
1015         put_bits(&s->pb, 1, 0);         /* reduced res vop */
1016     }
1017     put_bits(&s->pb, 1, 0);             /* scalability */
1018
1019     ff_mpeg4_stuffing(&s->pb);
1020
1021     /* user data */
1022     if(!(s->flags & CODEC_FLAG_BITEXACT)){
1023         put_bits(&s->pb, 16, 0);
1024         put_bits(&s->pb, 16, 0x1B2);    /* user_data */
1025         ff_put_string(&s->pb, LIBAVCODEC_IDENT, 0);
1026     }
1027 }
1028
1029 /* write mpeg4 VOP header */
1030 void mpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
1031 {
1032     int time_incr;
1033     int time_div, time_mod;
1034
1035     if(s->pict_type==AV_PICTURE_TYPE_I){
1036         if(!(s->flags&CODEC_FLAG_GLOBAL_HEADER)){
1037             if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT) //HACK, the reference sw is buggy
1038                 mpeg4_encode_visual_object_header(s);
1039             if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT || picture_number==0) //HACK, the reference sw is buggy
1040                 mpeg4_encode_vol_header(s, 0, 0);
1041         }
1042         if(!(s->workaround_bugs & FF_BUG_MS))
1043             mpeg4_encode_gop_header(s);
1044     }
1045
1046     s->partitioned_frame= s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B;
1047
1048     put_bits(&s->pb, 16, 0);                /* vop header */
1049     put_bits(&s->pb, 16, VOP_STARTCODE);    /* vop header */
1050     put_bits(&s->pb, 2, s->pict_type - 1);  /* pict type: I = 0 , P = 1 */
1051
1052     assert(s->time>=0);
1053     time_div= s->time/s->avctx->time_base.den;
1054     time_mod= s->time%s->avctx->time_base.den;
1055     time_incr= time_div - s->last_time_base;
1056     assert(time_incr >= 0);
1057     while(time_incr--)
1058         put_bits(&s->pb, 1, 1);
1059
1060     put_bits(&s->pb, 1, 0);
1061
1062     put_bits(&s->pb, 1, 1);                             /* marker */
1063     put_bits(&s->pb, s->time_increment_bits, time_mod); /* time increment */
1064     put_bits(&s->pb, 1, 1);                             /* marker */
1065     put_bits(&s->pb, 1, 1);                             /* vop coded */
1066     if (    s->pict_type == AV_PICTURE_TYPE_P
1067         || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE)) {
1068         put_bits(&s->pb, 1, s->no_rounding);    /* rounding type */
1069     }
1070     put_bits(&s->pb, 3, 0);     /* intra dc VLC threshold */
1071     if(!s->progressive_sequence){
1072          put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
1073          put_bits(&s->pb, 1, s->alternate_scan);
1074     }
1075     //FIXME sprite stuff
1076
1077     put_bits(&s->pb, 5, s->qscale);
1078
1079     if (s->pict_type != AV_PICTURE_TYPE_I)
1080         put_bits(&s->pb, 3, s->f_code); /* fcode_for */
1081     if (s->pict_type == AV_PICTURE_TYPE_B)
1082         put_bits(&s->pb, 3, s->b_code); /* fcode_back */
1083 }
1084
1085
1086 static void init_uni_dc_tab(void)
1087 {
1088     int level, uni_code, uni_len;
1089
1090     for(level=-256; level<256; level++){
1091         int size, v, l;
1092         /* find number of bits */
1093         size = 0;
1094         v = abs(level);
1095         while (v) {
1096             v >>= 1;
1097             size++;
1098         }
1099
1100         if (level < 0)
1101             l= (-level) ^ ((1 << size) - 1);
1102         else
1103             l= level;
1104
1105         /* luminance */
1106         uni_code= ff_mpeg4_DCtab_lum[size][0];
1107         uni_len = ff_mpeg4_DCtab_lum[size][1];
1108
1109         if (size > 0) {
1110             uni_code<<=size; uni_code|=l;
1111             uni_len+=size;
1112             if (size > 8){
1113                 uni_code<<=1; uni_code|=1;
1114                 uni_len++;
1115             }
1116         }
1117         uni_DCtab_lum_bits[level+256]= uni_code;
1118         uni_DCtab_lum_len [level+256]= uni_len;
1119
1120         /* chrominance */
1121         uni_code= ff_mpeg4_DCtab_chrom[size][0];
1122         uni_len = ff_mpeg4_DCtab_chrom[size][1];
1123
1124         if (size > 0) {
1125             uni_code<<=size; uni_code|=l;
1126             uni_len+=size;
1127             if (size > 8){
1128                 uni_code<<=1; uni_code|=1;
1129                 uni_len++;
1130             }
1131         }
1132         uni_DCtab_chrom_bits[level+256]= uni_code;
1133         uni_DCtab_chrom_len [level+256]= uni_len;
1134
1135     }
1136 }
1137
1138 static void init_uni_mpeg4_rl_tab(RLTable *rl, uint32_t *bits_tab, uint8_t *len_tab){
1139     int slevel, run, last;
1140
1141     assert(MAX_LEVEL >= 64);
1142     assert(MAX_RUN   >= 63);
1143
1144     for(slevel=-64; slevel<64; slevel++){
1145         if(slevel==0) continue;
1146         for(run=0; run<64; run++){
1147             for(last=0; last<=1; last++){
1148                 const int index= UNI_MPEG4_ENC_INDEX(last, run, slevel+64);
1149                 int level= slevel < 0 ? -slevel : slevel;
1150                 int sign= slevel < 0 ? 1 : 0;
1151                 int bits, len, code;
1152                 int level1, run1;
1153
1154                 len_tab[index]= 100;
1155
1156                 /* ESC0 */
1157                 code= get_rl_index(rl, last, run, level);
1158                 bits= rl->table_vlc[code][0];
1159                 len=  rl->table_vlc[code][1];
1160                 bits=bits*2+sign; len++;
1161
1162                 if(code!=rl->n && len < len_tab[index]){
1163                     bits_tab[index]= bits;
1164                     len_tab [index]= len;
1165                 }
1166                 /* ESC1 */
1167                 bits= rl->table_vlc[rl->n][0];
1168                 len=  rl->table_vlc[rl->n][1];
1169                 bits=bits*2;    len++; //esc1
1170                 level1= level - rl->max_level[last][run];
1171                 if(level1>0){
1172                     code= get_rl_index(rl, last, run, level1);
1173                     bits<<= rl->table_vlc[code][1];
1174                     len  += rl->table_vlc[code][1];
1175                     bits += rl->table_vlc[code][0];
1176                     bits=bits*2+sign; len++;
1177
1178                     if(code!=rl->n && len < len_tab[index]){
1179                         bits_tab[index]= bits;
1180                         len_tab [index]= len;
1181                     }
1182                 }
1183                 /* ESC2 */
1184                 bits= rl->table_vlc[rl->n][0];
1185                 len=  rl->table_vlc[rl->n][1];
1186                 bits=bits*4+2;    len+=2; //esc2
1187                 run1 = run - rl->max_run[last][level] - 1;
1188                 if(run1>=0){
1189                     code= get_rl_index(rl, last, run1, level);
1190                     bits<<= rl->table_vlc[code][1];
1191                     len  += rl->table_vlc[code][1];
1192                     bits += rl->table_vlc[code][0];
1193                     bits=bits*2+sign; len++;
1194
1195                     if(code!=rl->n && len < len_tab[index]){
1196                         bits_tab[index]= bits;
1197                         len_tab [index]= len;
1198                     }
1199                 }
1200                 /* ESC3 */
1201                 bits= rl->table_vlc[rl->n][0];
1202                 len = rl->table_vlc[rl->n][1];
1203                 bits=bits*4+3;    len+=2; //esc3
1204                 bits=bits*2+last; len++;
1205                 bits=bits*64+run; len+=6;
1206                 bits=bits*2+1;    len++;  //marker
1207                 bits=bits*4096+(slevel&0xfff); len+=12;
1208                 bits=bits*2+1;    len++;  //marker
1209
1210                 if(len < len_tab[index]){
1211                     bits_tab[index]= bits;
1212                     len_tab [index]= len;
1213                 }
1214             }
1215         }
1216     }
1217 }
1218
1219 static av_cold int encode_init(AVCodecContext *avctx)
1220 {
1221     MpegEncContext *s = avctx->priv_data;
1222     int ret;
1223     static int done = 0;
1224
1225     if((ret=MPV_encode_init(avctx)) < 0)
1226         return ret;
1227
1228     if (!done) {
1229         done = 1;
1230
1231         init_uni_dc_tab();
1232
1233         init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
1234
1235         init_uni_mpeg4_rl_tab(&ff_mpeg4_rl_intra, uni_mpeg4_intra_rl_bits, uni_mpeg4_intra_rl_len);
1236         init_uni_mpeg4_rl_tab(&ff_h263_rl_inter, uni_mpeg4_inter_rl_bits, uni_mpeg4_inter_rl_len);
1237     }
1238
1239     s->min_qcoeff= -2048;
1240     s->max_qcoeff=  2047;
1241     s->intra_ac_vlc_length     = uni_mpeg4_intra_rl_len;
1242     s->intra_ac_vlc_last_length= uni_mpeg4_intra_rl_len + 128*64;
1243     s->inter_ac_vlc_length     = uni_mpeg4_inter_rl_len;
1244     s->inter_ac_vlc_last_length= uni_mpeg4_inter_rl_len + 128*64;
1245     s->luma_dc_vlc_length= uni_DCtab_lum_len;
1246     s->ac_esc_length= 7+2+1+6+1+12+1;
1247     s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table;
1248     s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
1249
1250     if(s->flags & CODEC_FLAG_GLOBAL_HEADER){
1251
1252         s->avctx->extradata= av_malloc(1024);
1253         init_put_bits(&s->pb, s->avctx->extradata, 1024);
1254
1255         if(!(s->workaround_bugs & FF_BUG_MS))
1256             mpeg4_encode_visual_object_header(s);
1257         mpeg4_encode_vol_header(s, 0, 0);
1258
1259 //            ff_mpeg4_stuffing(&s->pb); ?
1260         flush_put_bits(&s->pb);
1261         s->avctx->extradata_size= (put_bits_count(&s->pb)+7)>>3;
1262     }
1263     return 0;
1264 }
1265
1266 void ff_mpeg4_init_partitions(MpegEncContext *s)
1267 {
1268     uint8_t *start= put_bits_ptr(&s->pb);
1269     uint8_t *end= s->pb.buf_end;
1270     int size= end - start;
1271     int pb_size = (((intptr_t)start + size/3)&(~3)) - (intptr_t)start;
1272     int tex_size= (size - 2*pb_size)&(~3);
1273
1274     set_put_bits_buffer_size(&s->pb, pb_size);
1275     init_put_bits(&s->tex_pb, start + pb_size           , tex_size);
1276     init_put_bits(&s->pb2   , start + pb_size + tex_size, pb_size);
1277 }
1278
1279 void ff_mpeg4_merge_partitions(MpegEncContext *s)
1280 {
1281     const int pb2_len   = put_bits_count(&s->pb2   );
1282     const int tex_pb_len= put_bits_count(&s->tex_pb);
1283     const int bits= put_bits_count(&s->pb);
1284
1285     if(s->pict_type==AV_PICTURE_TYPE_I){
1286         put_bits(&s->pb, 19, DC_MARKER);
1287         s->misc_bits+=19 + pb2_len + bits - s->last_bits;
1288         s->i_tex_bits+= tex_pb_len;
1289     }else{
1290         put_bits(&s->pb, 17, MOTION_MARKER);
1291         s->misc_bits+=17 + pb2_len;
1292         s->mv_bits+= bits - s->last_bits;
1293         s->p_tex_bits+= tex_pb_len;
1294     }
1295
1296     flush_put_bits(&s->pb2);
1297     flush_put_bits(&s->tex_pb);
1298
1299     set_put_bits_buffer_size(&s->pb, s->pb2.buf_end - s->pb.buf);
1300     avpriv_copy_bits(&s->pb, s->pb2.buf   , pb2_len);
1301     avpriv_copy_bits(&s->pb, s->tex_pb.buf, tex_pb_len);
1302     s->last_bits= put_bits_count(&s->pb);
1303 }
1304
1305
1306 void ff_mpeg4_encode_video_packet_header(MpegEncContext *s)
1307 {
1308     int mb_num_bits= av_log2(s->mb_num - 1) + 1;
1309
1310     put_bits(&s->pb, ff_mpeg4_get_video_packet_prefix_length(s), 0);
1311     put_bits(&s->pb, 1, 1);
1312
1313     put_bits(&s->pb, mb_num_bits, s->mb_x + s->mb_y*s->mb_width);
1314     put_bits(&s->pb, s->quant_precision, s->qscale);
1315     put_bits(&s->pb, 1, 0); /* no HEC */
1316 }
1317
1318 #define OFFSET(x) offsetof(MpegEncContext, x)
1319 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
1320 static const AVOption options[] = {
1321     { "data_partitioning",       "Use data partitioning.",      OFFSET(data_partitioning), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
1322     { "alternate_scan",          "Enable alternate scantable.", OFFSET(alternate_scan),    AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
1323     { NULL },
1324 };
1325
1326 static const AVClass mpeg4enc_class = {
1327     .class_name = "MPEG4 encoder",
1328     .item_name  = av_default_item_name,
1329     .option     = options,
1330     .version    = LIBAVUTIL_VERSION_INT,
1331 };
1332
1333 AVCodec ff_mpeg4_encoder = {
1334     .name           = "mpeg4",
1335     .type           = AVMEDIA_TYPE_VIDEO,
1336     .id             = CODEC_ID_MPEG4,
1337     .priv_data_size = sizeof(MpegEncContext),
1338     .init           = encode_init,
1339     .encode         = MPV_encode_picture,
1340     .close          = MPV_encode_end,
1341     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
1342     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1343     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
1344     .priv_class     = &mpeg4enc_class,
1345 };