git.sesse.net Git - ffmpeg/blob - 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 "mpegvideo.h"
  24 #include "h263.h"
  25 #include "mpeg4video.h"
  26
  27 //The uni_DCtab_* tables below contain unified bits+length tables to encode DC
  28 //differences in mpeg4. Unified in the sense that the specification specifies
  29 //this encoding in several steps.
  30 static uint8_t uni_DCtab_lum_len[512];
  31 static uint8_t uni_DCtab_chrom_len[512];
  32 static uint16_t uni_DCtab_lum_bits[512];
  33 static uint16_t uni_DCtab_chrom_bits[512];
  34
  35 //unified encoding tables for run length encoding of coefficients
  36 //unified in the sense that the specification specifies the encoding in several steps.
  37 static uint32_t uni_mpeg4_intra_rl_bits[64*64*2*2];
  38 static uint8_t  uni_mpeg4_intra_rl_len [64*64*2*2];
  39 static uint32_t uni_mpeg4_inter_rl_bits[64*64*2*2];
  40 static uint8_t  uni_mpeg4_inter_rl_len [64*64*2*2];
  41 //#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128 + (run)*256 + (level))
  42 //#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run) + (level)*64)
  43 #define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run)*128 + (level))
  44
  45 /* mpeg4
  46 inter
  47 max level: 24/6
  48 max run: 53/63
  49
  50 intra
  51 max level: 53/16
  52 max run: 29/41
  53 */
  54
  55
  56 /**
  57  * Return the number of bits that encoding the 8x8 block in block would need.
  58  * @param[in]  block_last_index last index in scantable order that refers to a non zero element in block.
  59  */
  60 static inline int get_block_rate(MpegEncContext * s, DCTELEM block[64], int block_last_index, uint8_t scantable[64]){
  61     int last=0;
  62     int j;
  63     int rate=0;
  64
  65     for(j=1; j<=block_last_index; j++){
  66         const int index= scantable[j];
  67         int level= block[index];
  68         if(level){
  69             level+= 64;
  70             if((level&(~127)) == 0){
  71                 if(j<block_last_index) rate+= s->intra_ac_vlc_length     [UNI_AC_ENC_INDEX(j-last-1, level)];
  72                 else                   rate+= s->intra_ac_vlc_last_length[UNI_AC_ENC_INDEX(j-last-1, level)];
  73             }else
  74                 rate += s->ac_esc_length;
  75
  76             last= j;
  77         }
  78     }
  79
  80     return rate;
  81 }
  82
  83
  84 /**
  85  * Restore the ac coefficients in block that have been changed by decide_ac_pred().
  86  * This function also restores s->block_last_index.
  87  * @param[in,out] block MB coefficients, these will be restored
  88  * @param[in] dir ac prediction direction for each 8x8 block
  89  * @param[out] st scantable for each 8x8 block
  90  * @param[in] zigzag_last_index index refering to the last non zero coefficient in zigzag order
  91  */
  92 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])
  93 {
  94     int i, n;
  95     memcpy(s->block_last_index, zigzag_last_index, sizeof(int)*6);
  96
  97     for(n=0; n<6; n++){
  98         int16_t *ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
  99
 100         st[n]= s->intra_scantable.permutated;
 101         if(dir[n]){
 102             /* top prediction */
 103             for(i=1; i<8; i++){
 104                 block[n][s->dsp.idct_permutation[i   ]] = ac_val[i+8];
 105             }
 106         }else{
 107             /* left prediction */
 108             for(i=1; i<8; i++){
 109                 block[n][s->dsp.idct_permutation[i<<3]]= ac_val[i  ];
 110             }
 111         }
 112     }
 113 }
 114
 115 /**
 116  * Return the optimal value (0 or 1) for the ac_pred element for the given MB in mpeg4.
 117  * This function will also update s->block_last_index and s->ac_val.
 118  * @param[in,out] block MB coefficients, these will be updated if 1 is returned
 119  * @param[in] dir ac prediction direction for each 8x8 block
 120  * @param[out] st scantable for each 8x8 block
 121  * @param[out] zigzag_last_index index refering to the last non zero coefficient in zigzag order
 122  */
 123 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])
 124 {
 125     int score= 0;
 126     int i, n;
 127     int8_t * const qscale_table= s->current_picture.qscale_table;
 128
 129     memcpy(zigzag_last_index, s->block_last_index, sizeof(int)*6);
 130
 131     for(n=0; n<6; n++){
 132         int16_t *ac_val, *ac_val1;
 133
 134         score -= get_block_rate(s, block[n], s->block_last_index[n], s->intra_scantable.permutated);
 135
 136         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
 137         ac_val1= ac_val;
 138         if(dir[n]){
 139             const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
 140             /* top prediction */
 141             ac_val-= s->block_wrap[n]*16;
 142             if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
 143                 /* same qscale */
 144                 for(i=1; i<8; i++){
 145                     const int level= block[n][s->dsp.idct_permutation[i   ]];
 146                     block[n][s->dsp.idct_permutation[i   ]] = level - ac_val[i+8];
 147                     ac_val1[i  ]=    block[n][s->dsp.idct_permutation[i<<3]];
 148                     ac_val1[i+8]= level;
 149                 }
 150             }else{
 151                 /* different qscale, we must rescale */
 152                 for(i=1; i<8; i++){
 153                     const int level= block[n][s->dsp.idct_permutation[i   ]];
 154                     block[n][s->dsp.idct_permutation[i   ]] = level - ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
 155                     ac_val1[i  ]=    block[n][s->dsp.idct_permutation[i<<3]];
 156                     ac_val1[i+8]= level;
 157                 }
 158             }
 159             st[n]= s->intra_h_scantable.permutated;
 160         }else{
 161             const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
 162             /* left prediction */
 163             ac_val-= 16;
 164             if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
 165                 /* same qscale */
 166                 for(i=1; i<8; i++){
 167                     const int level= block[n][s->dsp.idct_permutation[i<<3]];
 168                     block[n][s->dsp.idct_permutation[i<<3]]= level - ac_val[i];
 169                     ac_val1[i  ]= level;
 170                     ac_val1[i+8]=    block[n][s->dsp.idct_permutation[i   ]];
 171                 }
 172             }else{
 173                 /* different qscale, we must rescale */
 174                 for(i=1; i<8; i++){
 175                     const int level= block[n][s->dsp.idct_permutation[i<<3]];
 176                     block[n][s->dsp.idct_permutation[i<<3]]= level - ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
 177                     ac_val1[i  ]= level;
 178                     ac_val1[i+8]=    block[n][s->dsp.idct_permutation[i   ]];
 179                 }
 180             }
 181             st[n]= s->intra_v_scantable.permutated;
 182         }
 183
 184         for(i=63; i>0; i--) //FIXME optimize
 185             if(block[n][ st[n][i] ]) break;
 186         s->block_last_index[n]= i;
 187
 188         score += get_block_rate(s, block[n], s->block_last_index[n], st[n]);
 189     }
 190
 191     if(score < 0){
 192         return 1;
 193     }else{
 194         restore_ac_coeffs(s, block, dir, st, zigzag_last_index);
 195         return 0;
 196     }
 197 }
 198
 199 /**
 200  * modify mb_type & qscale so that encoding is acually possible in mpeg4
 201  */
 202 void ff_clean_mpeg4_qscales(MpegEncContext *s){
 203     int i;
 204     int8_t * const qscale_table= s->current_picture.qscale_table;
 205
 206     ff_clean_h263_qscales(s);
 207
 208     if(s->pict_type== AV_PICTURE_TYPE_B){
 209         int odd=0;
 210         /* ok, come on, this isn't funny anymore, there's more code for handling this mpeg4 mess than for the actual adaptive quantization */
 211
 212         for(i=0; i<s->mb_num; i++){
 213             int mb_xy= s->mb_index2xy[i];
 214             odd += qscale_table[mb_xy]&1;
 215         }
 216
 217         if(2*odd > s->mb_num) odd=1;
 218         else                  odd=0;
 219
 220         for(i=0; i<s->mb_num; i++){
 221             int mb_xy= s->mb_index2xy[i];
 222             if((qscale_table[mb_xy]&1) != odd)
 223                 qscale_table[mb_xy]++;
 224             if(qscale_table[mb_xy] > 31)
 225                 qscale_table[mb_xy]= 31;
 226         }
 227
 228         for(i=1; i<s->mb_num; i++){
 229             int mb_xy= s->mb_index2xy[i];
 230             if(qscale_table[mb_xy] != qscale_table[s->mb_index2xy[i-1]] && (s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_DIRECT)){
 231                 s->mb_type[mb_xy]|= CANDIDATE_MB_TYPE_BIDIR;
 232             }
 233         }
 234     }
 235 }
 236
 237
 238 /**
 239  * encodes the dc value.
 240  * @param n block index (0-3 are luma, 4-5 are chroma)
 241  */
 242 static inline void mpeg4_encode_dc(PutBitContext * s, int level, int n)
 243 {
 244 #if 1
 245     /* DC will overflow if level is outside the [-255,255] range. */
 246     level+=256;
 247     if (n < 4) {
 248         /* luminance */
 249         put_bits(s, uni_DCtab_lum_len[level], uni_DCtab_lum_bits[level]);
 250     } else {
 251         /* chrominance */
 252         put_bits(s, uni_DCtab_chrom_len[level], uni_DCtab_chrom_bits[level]);
 253     }
 254 #else
 255     int size, v;
 256     /* find number of bits */
 257     size = 0;
 258     v = abs(level);
 259     while (v) {
 260         v >>= 1;
 261         size++;
 262     }
 263
 264     if (n < 4) {
 265         /* luminance */
 266         put_bits(&s->pb, ff_mpeg4_DCtab_lum[size][1], ff_mpeg4_DCtab_lum[size][0]);
 267     } else {
 268         /* chrominance */
 269         put_bits(&s->pb, ff_mpeg4_DCtab_chrom[size][1], ff_mpeg4_DCtab_chrom[size][0]);
 270     }
 271
 272     /* encode remaining bits */
 273     if (size > 0) {
 274         if (level < 0)
 275             level = (-level) ^ ((1 << size) - 1);
 276         put_bits(&s->pb, size, level);
 277         if (size > 8)
 278             put_bits(&s->pb, 1, 1);
 279     }
 280 #endif
 281 }
 282
 283 static inline int mpeg4_get_dc_length(int level, int n){
 284     if (n < 4) {
 285         return uni_DCtab_lum_len[level + 256];
 286     } else {
 287         return uni_DCtab_chrom_len[level + 256];
 288     }
 289 }
 290
 291 /**
 292  * encodes a 8x8 block
 293  * @param n block index (0-3 are luma, 4-5 are chroma)
 294  */
 295 static inline void mpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n, int intra_dc,
 296                                uint8_t *scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb)
 297 {
 298     int i, last_non_zero;
 299     uint32_t *bits_tab;
 300     uint8_t *len_tab;
 301     const int last_index = s->block_last_index[n];
 302
 303     if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
 304         /* mpeg4 based DC predictor */
 305         mpeg4_encode_dc(dc_pb, intra_dc, n);
 306         if(last_index<1) return;
 307         i = 1;
 308         bits_tab= uni_mpeg4_intra_rl_bits;
 309         len_tab = uni_mpeg4_intra_rl_len;
 310     } else {
 311         if(last_index<0) return;
 312         i = 0;
 313         bits_tab= uni_mpeg4_inter_rl_bits;
 314         len_tab = uni_mpeg4_inter_rl_len;
 315     }
 316
 317     /* AC coefs */
 318     last_non_zero = i - 1;
 319     for (; i < last_index; i++) {
 320         int level = block[ scan_table[i] ];
 321         if (level) {
 322             int run = i - last_non_zero - 1;
 323             level+=64;
 324             if((level&(~127)) == 0){
 325                 const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
 326                 put_bits(ac_pb, len_tab[index], bits_tab[index]);
 327             }else{ //ESC3
 328                 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);
 329             }
 330             last_non_zero = i;
 331         }
 332     }
 333     /*if(i<=last_index)*/{
 334         int level = block[ scan_table[i] ];
 335         int run = i - last_non_zero - 1;
 336         level+=64;
 337         if((level&(~127)) == 0){
 338             const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
 339             put_bits(ac_pb, len_tab[index], bits_tab[index]);
 340         }else{ //ESC3
 341             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);
 342         }
 343     }
 344 }
 345
 346 static int mpeg4_get_block_length(MpegEncContext * s, DCTELEM * block, int n, int intra_dc,
 347                                uint8_t *scan_table)
 348 {
 349     int i, last_non_zero;
 350     uint8_t *len_tab;
 351     const int last_index = s->block_last_index[n];
 352     int len=0;
 353
 354     if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
 355         /* mpeg4 based DC predictor */
 356         len += mpeg4_get_dc_length(intra_dc, n);
 357         if(last_index<1) return len;
 358         i = 1;
 359         len_tab = uni_mpeg4_intra_rl_len;
 360     } else {
 361         if(last_index<0) return 0;
 362         i = 0;
 363         len_tab = uni_mpeg4_inter_rl_len;
 364     }
 365
 366     /* AC coefs */
 367     last_non_zero = i - 1;
 368     for (; i < last_index; i++) {
 369         int level = block[ scan_table[i] ];
 370         if (level) {
 371             int run = i - last_non_zero - 1;
 372             level+=64;
 373             if((level&(~127)) == 0){
 374                 const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
 375                 len += len_tab[index];
 376             }else{ //ESC3
 377                 len += 7+2+1+6+1+12+1;
 378             }
 379             last_non_zero = i;
 380         }
 381     }
 382     /*if(i<=last_index)*/{
 383         int level = block[ scan_table[i] ];
 384         int run = i - last_non_zero - 1;
 385         level+=64;
 386         if((level&(~127)) == 0){
 387             const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
 388             len += len_tab[index];
 389         }else{ //ESC3
 390             len += 7+2+1+6+1+12+1;
 391         }
 392     }
 393
 394     return len;
 395 }
 396
 397 static inline void mpeg4_encode_blocks(MpegEncContext * s, DCTELEM block[6][64], int intra_dc[6],
 398                                uint8_t **scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb){
 399     int i;
 400
 401     if(scan_table){
 402         if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
 403             for (i = 0; i < 6; i++) {
 404                 skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, intra_dc[i], scan_table[i]));
 405             }
 406         }else{
 407             /* encode each block */
 408             for (i = 0; i < 6; i++) {
 409                 mpeg4_encode_block(s, block[i], i, intra_dc[i], scan_table[i], dc_pb, ac_pb);
 410             }
 411         }
 412     }else{
 413         if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
 414             for (i = 0; i < 6; i++) {
 415                 skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, 0, s->intra_scantable.permutated));
 416             }
 417         }else{
 418             /* encode each block */
 419             for (i = 0; i < 6; i++) {
 420                 mpeg4_encode_block(s, block[i], i, 0, s->intra_scantable.permutated, dc_pb, ac_pb);
 421             }
 422         }
 423     }
 424 }
 425
 426 //FIXME this is duplicated to h263.c
 427 static const int dquant_code[5]= {1,0,9,2,3};
 428
 429 void mpeg4_encode_mb(MpegEncContext * s,
 430                     DCTELEM block[6][64],
 431                     int motion_x, int motion_y)
 432 {
 433     int cbpc, cbpy, pred_x, pred_y;
 434     PutBitContext * const pb2    = s->data_partitioning                         ? &s->pb2    : &s->pb;
 435     PutBitContext * const tex_pb = s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B ? &s->tex_pb : &s->pb;
 436     PutBitContext * const dc_pb  = s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_I ? &s->pb2    : &s->pb;
 437     const int interleaved_stats= (s->flags&CODEC_FLAG_PASS1) && !s->data_partitioning ? 1 : 0;
 438
 439     if (!s->mb_intra) {
 440         int i, cbp;
 441
 442         if(s->pict_type==AV_PICTURE_TYPE_B){
 443             static const int mb_type_table[8]= {-1, 3, 2, 1,-1,-1,-1, 0}; /* convert from mv_dir to type */
 444             int mb_type=  mb_type_table[s->mv_dir];
 445
 446             if(s->mb_x==0){
 447                 for(i=0; i<2; i++){
 448                     s->last_mv[i][0][0]=
 449                     s->last_mv[i][0][1]=
 450                     s->last_mv[i][1][0]=
 451                     s->last_mv[i][1][1]= 0;
 452                 }
 453             }
 454
 455             assert(s->dquant>=-2 && s->dquant<=2);
 456             assert((s->dquant&1)==0);
 457             assert(mb_type>=0);
 458
 459             /* nothing to do if this MB was skipped in the next P Frame */
 460             if(s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]){ //FIXME avoid DCT & ...
 461                 s->skip_count++;
 462                 s->mv[0][0][0]=
 463                 s->mv[0][0][1]=
 464                 s->mv[1][0][0]=
 465                 s->mv[1][0][1]= 0;
 466                 s->mv_dir= MV_DIR_FORWARD; //doesn't matter
 467                 s->qscale -= s->dquant;
 468 //                s->mb_skipped=1;
 469
 470                 return;
 471             }
 472
 473             cbp= get_b_cbp(s, block, motion_x, motion_y, mb_type);
 474
 475             if ((cbp | motion_x | motion_y | mb_type) ==0) {
 476                 /* direct MB with MV={0,0} */
 477                 assert(s->dquant==0);
 478
 479                 put_bits(&s->pb, 1, 1); /* mb not coded modb1=1 */
 480
 481                 if(interleaved_stats){
 482                     s->misc_bits++;
 483                     s->last_bits++;
 484                 }
 485                 s->skip_count++;
 486                 return;
 487             }
 488
 489             put_bits(&s->pb, 1, 0);     /* mb coded modb1=0 */
 490             put_bits(&s->pb, 1, cbp ? 0 : 1); /* modb2 */ //FIXME merge
 491             put_bits(&s->pb, mb_type+1, 1); // this table is so simple that we don't need it :)
 492             if(cbp) put_bits(&s->pb, 6, cbp);
 493
 494             if(cbp && mb_type){
 495                 if(s->dquant)
 496                     put_bits(&s->pb, 2, (s->dquant>>2)+3);
 497                 else
 498                     put_bits(&s->pb, 1, 0);
 499             }else
 500                 s->qscale -= s->dquant;
 501
 502             if(!s->progressive_sequence){
 503                 if(cbp)
 504                     put_bits(&s->pb, 1, s->interlaced_dct);
 505                 if(mb_type) // not direct mode
 506                     put_bits(&s->pb, 1, s->mv_type == MV_TYPE_FIELD);
 507             }
 508
 509             if(interleaved_stats){
 510                 s->misc_bits+= get_bits_diff(s);
 511             }
 512
 513             if(mb_type == 0){
 514                 assert(s->mv_dir & MV_DIRECT);
 515                 ff_h263_encode_motion_vector(s, motion_x, motion_y, 1);
 516                 s->b_count++;
 517                 s->f_count++;
 518             }else{
 519                 assert(mb_type > 0 && mb_type < 4);
 520                 if(s->mv_type != MV_TYPE_FIELD){
 521                     if(s->mv_dir & MV_DIR_FORWARD){
 522                         ff_h263_encode_motion_vector(s, s->mv[0][0][0] - s->last_mv[0][0][0],
 523                                                         s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 524                         s->last_mv[0][0][0]= s->last_mv[0][1][0]= s->mv[0][0][0];
 525                         s->last_mv[0][0][1]= s->last_mv[0][1][1]= s->mv[0][0][1];
 526                         s->f_count++;
 527                     }
 528                     if(s->mv_dir & MV_DIR_BACKWARD){
 529                         ff_h263_encode_motion_vector(s, s->mv[1][0][0] - s->last_mv[1][0][0],
 530                                                         s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 531                         s->last_mv[1][0][0]= s->last_mv[1][1][0]= s->mv[1][0][0];
 532                         s->last_mv[1][0][1]= s->last_mv[1][1][1]= s->mv[1][0][1];
 533                         s->b_count++;
 534                     }
 535                 }else{
 536                     if(s->mv_dir & MV_DIR_FORWARD){
 537                         put_bits(&s->pb, 1, s->field_select[0][0]);
 538                         put_bits(&s->pb, 1, s->field_select[0][1]);
 539                     }
 540                     if(s->mv_dir & MV_DIR_BACKWARD){
 541                         put_bits(&s->pb, 1, s->field_select[1][0]);
 542                         put_bits(&s->pb, 1, s->field_select[1][1]);
 543                     }
 544                     if(s->mv_dir & MV_DIR_FORWARD){
 545                         for(i=0; i<2; i++){
 546                             ff_h263_encode_motion_vector(s, s->mv[0][i][0] - s->last_mv[0][i][0]  ,
 547                                                             s->mv[0][i][1] - s->last_mv[0][i][1]/2, s->f_code);
 548                             s->last_mv[0][i][0]= s->mv[0][i][0];
 549                             s->last_mv[0][i][1]= s->mv[0][i][1]*2;
 550                         }
 551                         s->f_count++;
 552                     }
 553                     if(s->mv_dir & MV_DIR_BACKWARD){
 554                         for(i=0; i<2; i++){
 555                             ff_h263_encode_motion_vector(s, s->mv[1][i][0] - s->last_mv[1][i][0]  ,
 556                                                             s->mv[1][i][1] - s->last_mv[1][i][1]/2, s->b_code);
 557                             s->last_mv[1][i][0]= s->mv[1][i][0];
 558                             s->last_mv[1][i][1]= s->mv[1][i][1]*2;
 559                         }
 560                         s->b_count++;
 561                     }
 562                 }
 563             }
 564
 565             if(interleaved_stats){
 566                 s->mv_bits+= get_bits_diff(s);
 567             }
 568
 569             mpeg4_encode_blocks(s, block, NULL, NULL, NULL, &s->pb);
 570
 571             if(interleaved_stats){
 572                 s->p_tex_bits+= get_bits_diff(s);
 573             }
 574
 575         }else{ /* s->pict_type==AV_PICTURE_TYPE_B */
 576             cbp= get_p_cbp(s, block, motion_x, motion_y);
 577
 578             if ((cbp | motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16) {
 579                 /* check if the B frames can skip it too, as we must skip it if we skip here
 580                    why didn't they just compress the skip-mb bits instead of reusing them ?! */
 581                 if(s->max_b_frames>0){
 582                     int i;
 583                     int x,y, offset;
 584                     uint8_t *p_pic;
 585
 586                     x= s->mb_x*16;
 587                     y= s->mb_y*16;
 588
 589                     offset= x + y*s->linesize;
 590                     p_pic= s->new_picture.data[0] + offset;
 591
 592                     s->mb_skipped=1;
 593                     for(i=0; i<s->max_b_frames; i++){
 594                         uint8_t *b_pic;
 595                         int diff;
 596                         Picture *pic= s->reordered_input_picture[i+1];
 597
 598                         if(pic==NULL || pic->pict_type!=AV_PICTURE_TYPE_B) break;
 599
 600                         b_pic= pic->data[0] + offset;
 601                         if(pic->type != FF_BUFFER_TYPE_SHARED)
 602                             b_pic+= INPLACE_OFFSET;
 603
 604                         if(x+16 > s->width || y+16 > s->height){
 605                             int x1,y1;
 606                             int xe= FFMIN(16, s->width - x);
 607                             int ye= FFMIN(16, s->height- y);
 608                             diff=0;
 609                             for(y1=0; y1<ye; y1++){
 610                                 for(x1=0; x1<xe; x1++){
 611                                     diff+= FFABS(p_pic[x1+y1*s->linesize] - b_pic[x1+y1*s->linesize]);
 612                                 }
 613                             }
 614                             diff= diff*256/(xe*ye);
 615                         }else{
 616                             diff= s->dsp.sad[0](NULL, p_pic, b_pic, s->linesize, 16);
 617                         }
 618                         if(diff>s->qscale*70){ //FIXME check that 70 is optimal
 619                             s->mb_skipped=0;
 620                             break;
 621                         }
 622                     }
 623                 }else
 624                     s->mb_skipped=1;
 625
 626                 if(s->mb_skipped==1){
 627                     /* skip macroblock */
 628                     put_bits(&s->pb, 1, 1);
 629
 630                     if(interleaved_stats){
 631                         s->misc_bits++;
 632                         s->last_bits++;
 633                     }
 634                     s->skip_count++;
 635
 636                     return;
 637                 }
 638             }
 639
 640             put_bits(&s->pb, 1, 0);     /* mb coded */
 641             cbpc = cbp & 3;
 642             cbpy = cbp >> 2;
 643             cbpy ^= 0xf;
 644             if(s->mv_type==MV_TYPE_16X16){
 645                 if(s->dquant) cbpc+= 8;
 646                 put_bits(&s->pb,
 647                         ff_h263_inter_MCBPC_bits[cbpc],
 648                         ff_h263_inter_MCBPC_code[cbpc]);
 649
 650                 put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
 651                 if(s->dquant)
 652                     put_bits(pb2, 2, dquant_code[s->dquant+2]);
 653
 654                 if(!s->progressive_sequence){
 655                     if(cbp)
 656                         put_bits(pb2, 1, s->interlaced_dct);
 657                     put_bits(pb2, 1, 0);
 658                 }
 659
 660                 if(interleaved_stats){
 661                     s->misc_bits+= get_bits_diff(s);
 662                 }
 663
 664                 /* motion vectors: 16x16 mode */
 665                 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
 666
 667                 ff_h263_encode_motion_vector(s, motion_x - pred_x,
 668                                                 motion_y - pred_y, s->f_code);
 669             }else if(s->mv_type==MV_TYPE_FIELD){
 670                 if(s->dquant) cbpc+= 8;
 671                 put_bits(&s->pb,
 672                         ff_h263_inter_MCBPC_bits[cbpc],
 673                         ff_h263_inter_MCBPC_code[cbpc]);
 674
 675                 put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
 676                 if(s->dquant)
 677                     put_bits(pb2, 2, dquant_code[s->dquant+2]);
 678
 679                 assert(!s->progressive_sequence);
 680                 if(cbp)
 681                     put_bits(pb2, 1, s->interlaced_dct);
 682                 put_bits(pb2, 1, 1);
 683
 684                 if(interleaved_stats){
 685                     s->misc_bits+= get_bits_diff(s);
 686                 }
 687
 688                 /* motion vectors: 16x8 interlaced mode */
 689                 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
 690                 pred_y /=2;
 691
 692                 put_bits(&s->pb, 1, s->field_select[0][0]);
 693                 put_bits(&s->pb, 1, s->field_select[0][1]);
 694
 695                 ff_h263_encode_motion_vector(s, s->mv[0][0][0] - pred_x,
 696                                                 s->mv[0][0][1] - pred_y, s->f_code);
 697                 ff_h263_encode_motion_vector(s, s->mv[0][1][0] - pred_x,
 698                                                 s->mv[0][1][1] - pred_y, s->f_code);
 699             }else{
 700                 assert(s->mv_type==MV_TYPE_8X8);
 701                 put_bits(&s->pb,
 702                         ff_h263_inter_MCBPC_bits[cbpc+16],
 703                         ff_h263_inter_MCBPC_code[cbpc+16]);
 704                 put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
 705
 706                 if(!s->progressive_sequence){
 707                     if(cbp)
 708                         put_bits(pb2, 1, s->interlaced_dct);
 709                 }
 710
 711                 if(interleaved_stats){
 712                     s->misc_bits+= get_bits_diff(s);
 713                 }
 714
 715                 for(i=0; i<4; i++){
 716                     /* motion vectors: 8x8 mode*/
 717                     h263_pred_motion(s, i, 0, &pred_x, &pred_y);
 718
 719                     ff_h263_encode_motion_vector(s, s->current_picture.motion_val[0][ s->block_index[i] ][0] - pred_x,
 720                                                     s->current_picture.motion_val[0][ s->block_index[i] ][1] - pred_y, s->f_code);
 721                 }
 722             }
 723
 724             if(interleaved_stats){
 725                 s->mv_bits+= get_bits_diff(s);
 726             }
 727
 728             mpeg4_encode_blocks(s, block, NULL, NULL, NULL, tex_pb);
 729
 730             if(interleaved_stats){
 731                 s->p_tex_bits+= get_bits_diff(s);
 732             }
 733             s->f_count++;
 734         }
 735     } else {
 736         int cbp;
 737         int dc_diff[6];   //dc values with the dc prediction subtracted
 738         int dir[6];  //prediction direction
 739         int zigzag_last_index[6];
 740         uint8_t *scan_table[6];
 741         int i;
 742
 743         for(i=0; i<6; i++){
 744             dc_diff[i]= ff_mpeg4_pred_dc(s, i, block[i][0], &dir[i], 1);
 745         }
 746
 747         if(s->flags & CODEC_FLAG_AC_PRED){
 748             s->ac_pred= decide_ac_pred(s, block, dir, scan_table, zigzag_last_index);
 749         }else{
 750             for(i=0; i<6; i++)
 751                 scan_table[i]= s->intra_scantable.permutated;
 752         }
 753
 754         /* compute cbp */
 755         cbp = 0;
 756         for (i = 0; i < 6; i++) {
 757             if (s->block_last_index[i] >= 1)
 758                 cbp |= 1 << (5 - i);
 759         }
 760
 761         cbpc = cbp & 3;
 762         if (s->pict_type == AV_PICTURE_TYPE_I) {
 763             if(s->dquant) cbpc+=4;
 764             put_bits(&s->pb,
 765                 ff_h263_intra_MCBPC_bits[cbpc],
 766                 ff_h263_intra_MCBPC_code[cbpc]);
 767         } else {
 768             if(s->dquant) cbpc+=8;
 769             put_bits(&s->pb, 1, 0);     /* mb coded */
 770             put_bits(&s->pb,
 771                 ff_h263_inter_MCBPC_bits[cbpc + 4],
 772                 ff_h263_inter_MCBPC_code[cbpc + 4]);
 773         }
 774         put_bits(pb2, 1, s->ac_pred);
 775         cbpy = cbp >> 2;
 776         put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
 777         if(s->dquant)
 778             put_bits(dc_pb, 2, dquant_code[s->dquant+2]);
 779
 780         if(!s->progressive_sequence){
 781             put_bits(dc_pb, 1, s->interlaced_dct);
 782         }
 783
 784         if(interleaved_stats){
 785             s->misc_bits+= get_bits_diff(s);
 786         }
 787
 788         mpeg4_encode_blocks(s, block, dc_diff, scan_table, dc_pb, tex_pb);
 789
 790         if(interleaved_stats){
 791             s->i_tex_bits+= get_bits_diff(s);
 792         }
 793         s->i_count++;
 794
 795         /* restore ac coeffs & last_index stuff if we messed them up with the prediction */
 796         if(s->ac_pred)
 797             restore_ac_coeffs(s, block, dir, scan_table, zigzag_last_index);
 798     }
 799 }
 800
 801 /**
 802  * add mpeg4 stuffing bits (01...1)
 803  */
 804 void ff_mpeg4_stuffing(PutBitContext * pbc)
 805 {
 806     int length;
 807     put_bits(pbc, 1, 0);
 808     length= (-put_bits_count(pbc))&7;
 809     if(length) put_bits(pbc, length, (1<<length)-1);
 810 }
 811
 812 /* must be called before writing the header */
 813 void ff_set_mpeg4_time(MpegEncContext * s){
 814     if(s->pict_type==AV_PICTURE_TYPE_B){
 815         ff_mpeg4_init_direct_mv(s);
 816     }else{
 817         s->last_time_base= s->time_base;
 818         s->time_base= FFUDIV(s->time, s->avctx->time_base.den);
 819     }
 820 }
 821
 822 static void mpeg4_encode_gop_header(MpegEncContext * s){
 823     int hours, minutes, seconds;
 824     int64_t time;
 825
 826     put_bits(&s->pb, 16, 0);
 827     put_bits(&s->pb, 16, GOP_STARTCODE);
 828
 829     time= s->current_picture_ptr->pts;
 830     if(s->reordered_input_picture[1])
 831         time= FFMIN(time, s->reordered_input_picture[1]->pts);
 832     time= time*s->avctx->time_base.num;
 833     s->last_time_base= FFUDIV(time, s->avctx->time_base.den);
 834
 835     seconds= FFUDIV(time, s->avctx->time_base.den);
 836     minutes= FFUDIV(seconds, 60); FFUMOD(seconds, 60);
 837     hours  = FFUDIV(minutes, 60); FFUMOD(minutes, 60);
 838     hours  = FFUMOD(hours  , 24);
 839
 840     put_bits(&s->pb, 5, hours);
 841     put_bits(&s->pb, 6, minutes);
 842     put_bits(&s->pb, 1, 1);
 843     put_bits(&s->pb, 6, seconds);
 844
 845     put_bits(&s->pb, 1, !!(s->flags&CODEC_FLAG_CLOSED_GOP));
 846     put_bits(&s->pb, 1, 0); //broken link == NO
 847
 848     ff_mpeg4_stuffing(&s->pb);
 849 }
 850
 851 static void mpeg4_encode_visual_object_header(MpegEncContext * s){
 852     int profile_and_level_indication;
 853     int vo_ver_id;
 854
 855     if(s->avctx->profile != FF_PROFILE_UNKNOWN){
 856         profile_and_level_indication = s->avctx->profile << 4;
 857     }else if(s->max_b_frames || s->quarter_sample){
 858         profile_and_level_indication= 0xF0; // adv simple
 859     }else{
 860         profile_and_level_indication= 0x00; // simple
 861     }
 862
 863     if(s->avctx->level != FF_LEVEL_UNKNOWN){
 864         profile_and_level_indication |= s->avctx->level;
 865     }else{
 866         profile_and_level_indication |= 1; //level 1
 867     }
 868
 869     if(profile_and_level_indication>>4 == 0xF){
 870         vo_ver_id= 5;
 871     }else{
 872         vo_ver_id= 1;
 873     }
 874
 875     //FIXME levels
 876
 877     put_bits(&s->pb, 16, 0);
 878     put_bits(&s->pb, 16, VOS_STARTCODE);
 879
 880     put_bits(&s->pb, 8, profile_and_level_indication);
 881
 882     put_bits(&s->pb, 16, 0);
 883     put_bits(&s->pb, 16, VISUAL_OBJ_STARTCODE);
 884
 885     put_bits(&s->pb, 1, 1);
 886         put_bits(&s->pb, 4, vo_ver_id);
 887         put_bits(&s->pb, 3, 1); //priority
 888
 889     put_bits(&s->pb, 4, 1); //visual obj type== video obj
 890
 891     put_bits(&s->pb, 1, 0); //video signal type == no clue //FIXME
 892
 893     ff_mpeg4_stuffing(&s->pb);
 894 }
 895
 896 static void mpeg4_encode_vol_header(MpegEncContext * s, int vo_number, int vol_number)
 897 {
 898     int vo_ver_id;
 899
 900     if (!CONFIG_MPEG4_ENCODER)  return;
 901
 902     if(s->max_b_frames || s->quarter_sample){
 903         vo_ver_id= 5;
 904         s->vo_type= ADV_SIMPLE_VO_TYPE;
 905     }else{
 906         vo_ver_id= 1;
 907         s->vo_type= SIMPLE_VO_TYPE;
 908     }
 909
 910     put_bits(&s->pb, 16, 0);
 911     put_bits(&s->pb, 16, 0x100 + vo_number);        /* video obj */
 912     put_bits(&s->pb, 16, 0);
 913     put_bits(&s->pb, 16, 0x120 + vol_number);       /* video obj layer */
 914
 915     put_bits(&s->pb, 1, 0);             /* random access vol */
 916     put_bits(&s->pb, 8, s->vo_type);    /* video obj type indication */
 917     if(s->workaround_bugs & FF_BUG_MS) {
 918         put_bits(&s->pb, 1, 0);         /* is obj layer id= no */
 919     } else {
 920         put_bits(&s->pb, 1, 1);         /* is obj layer id= yes */
 921         put_bits(&s->pb, 4, vo_ver_id); /* is obj layer ver id */
 922         put_bits(&s->pb, 3, 1);         /* is obj layer priority */
 923     }
 924
 925     s->aspect_ratio_info= ff_h263_aspect_to_info(s->avctx->sample_aspect_ratio);
 926
 927     put_bits(&s->pb, 4, s->aspect_ratio_info);/* aspect ratio info */
 928     if (s->aspect_ratio_info == FF_ASPECT_EXTENDED){
 929         put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.num);
 930         put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.den);
 931     }
 932
 933     if(s->workaround_bugs & FF_BUG_MS) { //
 934         put_bits(&s->pb, 1, 0);         /* vol control parameters= no @@@ */
 935     } else {
 936         put_bits(&s->pb, 1, 1);         /* vol control parameters= yes */
 937         put_bits(&s->pb, 2, 1);         /* chroma format YUV 420/YV12 */
 938         put_bits(&s->pb, 1, s->low_delay);
 939         put_bits(&s->pb, 1, 0);         /* vbv parameters= no */
 940     }
 941
 942     put_bits(&s->pb, 2, RECT_SHAPE);    /* vol shape= rectangle */
 943     put_bits(&s->pb, 1, 1);             /* marker bit */
 944
 945     put_bits(&s->pb, 16, s->avctx->time_base.den);
 946     if (s->time_increment_bits < 1)
 947         s->time_increment_bits = 1;
 948     put_bits(&s->pb, 1, 1);             /* marker bit */
 949     put_bits(&s->pb, 1, 0);             /* fixed vop rate=no */
 950     put_bits(&s->pb, 1, 1);             /* marker bit */
 951     put_bits(&s->pb, 13, s->width);     /* vol width */
 952     put_bits(&s->pb, 1, 1);             /* marker bit */
 953     put_bits(&s->pb, 13, s->height);    /* vol height */
 954     put_bits(&s->pb, 1, 1);             /* marker bit */
 955     put_bits(&s->pb, 1, s->progressive_sequence ? 0 : 1);
 956     put_bits(&s->pb, 1, 1);             /* obmc disable */
 957     if (vo_ver_id == 1) {
 958         put_bits(&s->pb, 1, s->vol_sprite_usage);       /* sprite enable */
 959     }else{
 960         put_bits(&s->pb, 2, s->vol_sprite_usage);       /* sprite enable */
 961     }
 962
 963     put_bits(&s->pb, 1, 0);             /* not 8 bit == false */
 964     put_bits(&s->pb, 1, s->mpeg_quant); /* quant type= (0=h263 style)*/
 965
 966     if(s->mpeg_quant){
 967         ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 968         ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 969     }
 970
 971     if (vo_ver_id != 1)
 972         put_bits(&s->pb, 1, s->quarter_sample);
 973     put_bits(&s->pb, 1, 1);             /* complexity estimation disable */
 974     s->resync_marker= s->rtp_mode;
 975     put_bits(&s->pb, 1, s->resync_marker ? 0 : 1);/* resync marker disable */
 976     put_bits(&s->pb, 1, s->data_partitioning ? 1 : 0);
 977     if(s->data_partitioning){
 978         put_bits(&s->pb, 1, 0);         /* no rvlc */
 979     }
 980
 981     if (vo_ver_id != 1){
 982         put_bits(&s->pb, 1, 0);         /* newpred */
 983         put_bits(&s->pb, 1, 0);         /* reduced res vop */
 984     }
 985     put_bits(&s->pb, 1, 0);             /* scalability */
 986
 987     ff_mpeg4_stuffing(&s->pb);
 988
 989     /* user data */
 990     if(!(s->flags & CODEC_FLAG_BITEXACT)){
 991         put_bits(&s->pb, 16, 0);
 992         put_bits(&s->pb, 16, 0x1B2);    /* user_data */
 993         ff_put_string(&s->pb, LIBAVCODEC_IDENT, 0);
 994     }
 995 }
 996
 997 /* write mpeg4 VOP header */
 998 void mpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
 999 {
1000     int time_incr;
1001     int time_div, time_mod;
1002
1003     if(s->pict_type==AV_PICTURE_TYPE_I){
1004         if(!(s->flags&CODEC_FLAG_GLOBAL_HEADER)){
1005             if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT) //HACK, the reference sw is buggy
1006                 mpeg4_encode_visual_object_header(s);
1007             if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT || picture_number==0) //HACK, the reference sw is buggy
1008                 mpeg4_encode_vol_header(s, 0, 0);
1009         }
1010         if(!(s->workaround_bugs & FF_BUG_MS))
1011             mpeg4_encode_gop_header(s);
1012     }
1013
1014     s->partitioned_frame= s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B;
1015
1016     put_bits(&s->pb, 16, 0);                /* vop header */
1017     put_bits(&s->pb, 16, VOP_STARTCODE);    /* vop header */
1018     put_bits(&s->pb, 2, s->pict_type - 1);  /* pict type: I = 0 , P = 1 */
1019
1020     time_div= FFUDIV(s->time, s->avctx->time_base.den);
1021     time_mod= FFUMOD(s->time, s->avctx->time_base.den);
1022     time_incr= time_div - s->last_time_base;
1023     assert(time_incr >= 0);
1024     while(time_incr--)
1025         put_bits(&s->pb, 1, 1);
1026
1027     put_bits(&s->pb, 1, 0);
1028
1029     put_bits(&s->pb, 1, 1);                             /* marker */
1030     put_bits(&s->pb, s->time_increment_bits, time_mod); /* time increment */
1031     put_bits(&s->pb, 1, 1);                             /* marker */
1032     put_bits(&s->pb, 1, 1);                             /* vop coded */
1033     if (    s->pict_type == AV_PICTURE_TYPE_P
1034         || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE)) {
1035         put_bits(&s->pb, 1, s->no_rounding);    /* rounding type */
1036     }
1037     put_bits(&s->pb, 3, 0);     /* intra dc VLC threshold */
1038     if(!s->progressive_sequence){
1039          put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
1040          put_bits(&s->pb, 1, s->alternate_scan);
1041     }
1042     //FIXME sprite stuff
1043
1044     put_bits(&s->pb, 5, s->qscale);
1045
1046     if (s->pict_type != AV_PICTURE_TYPE_I)
1047         put_bits(&s->pb, 3, s->f_code); /* fcode_for */
1048     if (s->pict_type == AV_PICTURE_TYPE_B)
1049         put_bits(&s->pb, 3, s->b_code); /* fcode_back */
1050 }
1051
1052
1053 static void init_uni_dc_tab(void)
1054 {
1055     int level, uni_code, uni_len;
1056
1057     for(level=-256; level<256; level++){
1058         int size, v, l;
1059         /* find number of bits */
1060         size = 0;
1061         v = abs(level);
1062         while (v) {
1063             v >>= 1;
1064             size++;
1065         }
1066
1067         if (level < 0)
1068             l= (-level) ^ ((1 << size) - 1);
1069         else
1070             l= level;
1071
1072         /* luminance */
1073         uni_code= ff_mpeg4_DCtab_lum[size][0];
1074         uni_len = ff_mpeg4_DCtab_lum[size][1];
1075
1076         if (size > 0) {
1077             uni_code<<=size; uni_code|=l;
1078             uni_len+=size;
1079             if (size > 8){
1080                 uni_code<<=1; uni_code|=1;
1081                 uni_len++;
1082             }
1083         }
1084         uni_DCtab_lum_bits[level+256]= uni_code;
1085         uni_DCtab_lum_len [level+256]= uni_len;
1086
1087         /* chrominance */
1088         uni_code= ff_mpeg4_DCtab_chrom[size][0];
1089         uni_len = ff_mpeg4_DCtab_chrom[size][1];
1090
1091         if (size > 0) {
1092             uni_code<<=size; uni_code|=l;
1093             uni_len+=size;
1094             if (size > 8){
1095                 uni_code<<=1; uni_code|=1;
1096                 uni_len++;
1097             }
1098         }
1099         uni_DCtab_chrom_bits[level+256]= uni_code;
1100         uni_DCtab_chrom_len [level+256]= uni_len;
1101
1102     }
1103 }
1104
1105 static void init_uni_mpeg4_rl_tab(RLTable *rl, uint32_t *bits_tab, uint8_t *len_tab){
1106     int slevel, run, last;
1107
1108     assert(MAX_LEVEL >= 64);
1109     assert(MAX_RUN   >= 63);
1110
1111     for(slevel=-64; slevel<64; slevel++){
1112         if(slevel==0) continue;
1113         for(run=0; run<64; run++){
1114             for(last=0; last<=1; last++){
1115                 const int index= UNI_MPEG4_ENC_INDEX(last, run, slevel+64);
1116                 int level= slevel < 0 ? -slevel : slevel;
1117                 int sign= slevel < 0 ? 1 : 0;
1118                 int bits, len, code;
1119                 int level1, run1;
1120
1121                 len_tab[index]= 100;
1122
1123                 /* ESC0 */
1124                 code= get_rl_index(rl, last, run, level);
1125                 bits= rl->table_vlc[code][0];
1126                 len=  rl->table_vlc[code][1];
1127                 bits=bits*2+sign; len++;
1128
1129                 if(code!=rl->n && len < len_tab[index]){
1130                     bits_tab[index]= bits;
1131                     len_tab [index]= len;
1132                 }
1133                 /* ESC1 */
1134                 bits= rl->table_vlc[rl->n][0];
1135                 len=  rl->table_vlc[rl->n][1];
1136                 bits=bits*2;    len++; //esc1
1137                 level1= level - rl->max_level[last][run];
1138                 if(level1>0){
1139                     code= get_rl_index(rl, last, run, level1);
1140                     bits<<= rl->table_vlc[code][1];
1141                     len  += rl->table_vlc[code][1];
1142                     bits += rl->table_vlc[code][0];
1143                     bits=bits*2+sign; len++;
1144
1145                     if(code!=rl->n && len < len_tab[index]){
1146                         bits_tab[index]= bits;
1147                         len_tab [index]= len;
1148                     }
1149                 }
1150                 /* ESC2 */
1151                 bits= rl->table_vlc[rl->n][0];
1152                 len=  rl->table_vlc[rl->n][1];
1153                 bits=bits*4+2;    len+=2; //esc2
1154                 run1 = run - rl->max_run[last][level] - 1;
1155                 if(run1>=0){
1156                     code= get_rl_index(rl, last, run1, level);
1157                     bits<<= rl->table_vlc[code][1];
1158                     len  += rl->table_vlc[code][1];
1159                     bits += rl->table_vlc[code][0];
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                 }
1167                 /* ESC3 */
1168                 bits= rl->table_vlc[rl->n][0];
1169                 len = rl->table_vlc[rl->n][1];
1170                 bits=bits*4+3;    len+=2; //esc3
1171                 bits=bits*2+last; len++;
1172                 bits=bits*64+run; len+=6;
1173                 bits=bits*2+1;    len++;  //marker
1174                 bits=bits*4096+(slevel&0xfff); len+=12;
1175                 bits=bits*2+1;    len++;  //marker
1176
1177                 if(len < len_tab[index]){
1178                     bits_tab[index]= bits;
1179                     len_tab [index]= len;
1180                 }
1181             }
1182         }
1183     }
1184 }
1185
1186 static av_cold int encode_init(AVCodecContext *avctx)
1187 {
1188     MpegEncContext *s = avctx->priv_data;
1189     int ret;
1190     static int done = 0;
1191
1192     if((ret=MPV_encode_init(avctx)) < 0)
1193         return ret;
1194
1195     if (!done) {
1196         done = 1;
1197
1198         init_uni_dc_tab();
1199
1200         init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
1201
1202         init_uni_mpeg4_rl_tab(&ff_mpeg4_rl_intra, uni_mpeg4_intra_rl_bits, uni_mpeg4_intra_rl_len);
1203         init_uni_mpeg4_rl_tab(&ff_h263_rl_inter, uni_mpeg4_inter_rl_bits, uni_mpeg4_inter_rl_len);
1204     }
1205
1206     s->min_qcoeff= -2048;
1207     s->max_qcoeff=  2047;
1208     s->intra_ac_vlc_length     = uni_mpeg4_intra_rl_len;
1209     s->intra_ac_vlc_last_length= uni_mpeg4_intra_rl_len + 128*64;
1210     s->inter_ac_vlc_length     = uni_mpeg4_inter_rl_len;
1211     s->inter_ac_vlc_last_length= uni_mpeg4_inter_rl_len + 128*64;
1212     s->luma_dc_vlc_length= uni_DCtab_lum_len;
1213     s->chroma_dc_vlc_length= uni_DCtab_chrom_len;
1214     s->ac_esc_length= 7+2+1+6+1+12+1;
1215     s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table;
1216     s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
1217
1218     if(s->flags & CODEC_FLAG_GLOBAL_HEADER){
1219
1220         s->avctx->extradata= av_malloc(1024);
1221         init_put_bits(&s->pb, s->avctx->extradata, 1024);
1222
1223         if(!(s->workaround_bugs & FF_BUG_MS))
1224             mpeg4_encode_visual_object_header(s);
1225         mpeg4_encode_vol_header(s, 0, 0);
1226
1227 //            ff_mpeg4_stuffing(&s->pb); ?
1228         flush_put_bits(&s->pb);
1229         s->avctx->extradata_size= (put_bits_count(&s->pb)+7)>>3;
1230     }
1231     return 0;
1232 }
1233
1234 void ff_mpeg4_init_partitions(MpegEncContext *s)
1235 {
1236     uint8_t *start= put_bits_ptr(&s->pb);
1237     uint8_t *end= s->pb.buf_end;
1238     int size= end - start;
1239     int pb_size = (((intptr_t)start + size/3)&(~3)) - (intptr_t)start;
1240     int tex_size= (size - 2*pb_size)&(~3);
1241
1242     set_put_bits_buffer_size(&s->pb, pb_size);
1243     init_put_bits(&s->tex_pb, start + pb_size           , tex_size);
1244     init_put_bits(&s->pb2   , start + pb_size + tex_size, pb_size);
1245 }
1246
1247 void ff_mpeg4_merge_partitions(MpegEncContext *s)
1248 {
1249     const int pb2_len   = put_bits_count(&s->pb2   );
1250     const int tex_pb_len= put_bits_count(&s->tex_pb);
1251     const int bits= put_bits_count(&s->pb);
1252
1253     if(s->pict_type==AV_PICTURE_TYPE_I){
1254         put_bits(&s->pb, 19, DC_MARKER);
1255         s->misc_bits+=19 + pb2_len + bits - s->last_bits;
1256         s->i_tex_bits+= tex_pb_len;
1257     }else{
1258         put_bits(&s->pb, 17, MOTION_MARKER);
1259         s->misc_bits+=17 + pb2_len;
1260         s->mv_bits+= bits - s->last_bits;
1261         s->p_tex_bits+= tex_pb_len;
1262     }
1263
1264     flush_put_bits(&s->pb2);
1265     flush_put_bits(&s->tex_pb);
1266
1267     set_put_bits_buffer_size(&s->pb, s->pb2.buf_end - s->pb.buf);
1268     ff_copy_bits(&s->pb, s->pb2.buf   , pb2_len);
1269     ff_copy_bits(&s->pb, s->tex_pb.buf, tex_pb_len);
1270     s->last_bits= put_bits_count(&s->pb);
1271 }
1272
1273
1274 void ff_mpeg4_encode_video_packet_header(MpegEncContext *s)
1275 {
1276     int mb_num_bits= av_log2(s->mb_num - 1) + 1;
1277
1278     put_bits(&s->pb, ff_mpeg4_get_video_packet_prefix_length(s), 0);
1279     put_bits(&s->pb, 1, 1);
1280
1281     put_bits(&s->pb, mb_num_bits, s->mb_x + s->mb_y*s->mb_width);
1282     put_bits(&s->pb, s->quant_precision, s->qscale);
1283     put_bits(&s->pb, 1, 0); /* no HEC */
1284 }
1285
1286 AVCodec ff_mpeg4_encoder = {
1287     "mpeg4",
1288     AVMEDIA_TYPE_VIDEO,
1289     CODEC_ID_MPEG4,
1290     sizeof(MpegEncContext),
1291     encode_init,
1292     MPV_encode_picture,
1293     MPV_encode_end,
1294     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
1295     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1296     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
1297 };