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 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/attributes.h"
  24 #include "libavutil/log.h"
  25 #include "libavutil/opt.h"
  26 #include "mpegvideo.h"
  27 #include "h263.h"
  28 #include "mpeg4video.h"
  29
  30 //The uni_DCtab_* tables below contain unified bits+length tables to encode DC
  31 //differences in mpeg4. Unified in the sense that the specification specifies
  32 //this encoding in several steps.
  33 static uint8_t uni_DCtab_lum_len[512];
  34 static uint8_t uni_DCtab_chrom_len[512];
  35 static uint16_t uni_DCtab_lum_bits[512];
  36 static uint16_t uni_DCtab_chrom_bits[512];
  37
  38 //unified encoding tables for run length encoding of coefficients
  39 //unified in the sense that the specification specifies the encoding in several steps.
  40 static uint32_t uni_mpeg4_intra_rl_bits[64*64*2*2];
  41 static uint8_t  uni_mpeg4_intra_rl_len [64*64*2*2];
  42 static uint32_t uni_mpeg4_inter_rl_bits[64*64*2*2];
  43 static uint8_t  uni_mpeg4_inter_rl_len [64*64*2*2];
  44 //#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128 + (run)*256 + (level))
  45 //#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run) + (level)*64)
  46 #define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run)*128 + (level))
  47
  48 /* mpeg4
  49 inter
  50 max level: 24/6
  51 max run: 53/63
  52
  53 intra
  54 max level: 53/16
  55 max run: 29/41
  56 */
  57
  58
  59 /**
  60  * Return the number of bits that encoding the 8x8 block in block would need.
  61  * @param[in]  block_last_index last index in scantable order that refers to a non zero element in block.
  62  */
  63 static inline int get_block_rate(MpegEncContext * s, int16_t block[64], int block_last_index, uint8_t scantable[64]){
  64     int last=0;
  65     int j;
  66     int rate=0;
  67
  68     for(j=1; j<=block_last_index; j++){
  69         const int index= scantable[j];
  70         int level= block[index];
  71         if(level){
  72             level+= 64;
  73             if((level&(~127)) == 0){
  74                 if(j<block_last_index) rate+= s->intra_ac_vlc_length     [UNI_AC_ENC_INDEX(j-last-1, level)];
  75                 else                   rate+= s->intra_ac_vlc_last_length[UNI_AC_ENC_INDEX(j-last-1, level)];
  76             }else
  77                 rate += s->ac_esc_length;
  78
  79             last= j;
  80         }
  81     }
  82
  83     return rate;
  84 }
  85
  86
  87 /**
  88  * Restore the ac coefficients in block that have been changed by decide_ac_pred().
  89  * This function also restores s->block_last_index.
  90  * @param[in,out] block MB coefficients, these will be restored
  91  * @param[in] dir ac prediction direction for each 8x8 block
  92  * @param[out] st scantable for each 8x8 block
  93  * @param[in] zigzag_last_index index referring to the last non zero coefficient in zigzag order
  94  */
  95 static inline void restore_ac_coeffs(MpegEncContext * s, int16_t block[6][64], const int dir[6], uint8_t *st[6], const int zigzag_last_index[6])
  96 {
  97     int i, n;
  98     memcpy(s->block_last_index, zigzag_last_index, sizeof(int)*6);
  99
 100     for(n=0; n<6; n++){
 101         int16_t *ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
 102
 103         st[n]= s->intra_scantable.permutated;
 104         if(dir[n]){
 105             /* top prediction */
 106             for(i=1; i<8; i++){
 107                 block[n][s->dsp.idct_permutation[i   ]] = ac_val[i+8];
 108             }
 109         }else{
 110             /* left prediction */
 111             for(i=1; i<8; i++){
 112                 block[n][s->dsp.idct_permutation[i<<3]]= ac_val[i  ];
 113             }
 114         }
 115     }
 116 }
 117
 118 /**
 119  * Return the optimal value (0 or 1) for the ac_pred element for the given MB in mpeg4.
 120  * This function will also update s->block_last_index and s->ac_val.
 121  * @param[in,out] block MB coefficients, these will be updated if 1 is returned
 122  * @param[in] dir ac prediction direction for each 8x8 block
 123  * @param[out] st scantable for each 8x8 block
 124  * @param[out] zigzag_last_index index referring to the last non zero coefficient in zigzag order
 125  */
 126 static inline int decide_ac_pred(MpegEncContext * s, int16_t block[6][64], const int dir[6], uint8_t *st[6], int zigzag_last_index[6])
 127 {
 128     int score= 0;
 129     int i, n;
 130     int8_t * const qscale_table = s->current_picture.qscale_table;
 131
 132     memcpy(zigzag_last_index, s->block_last_index, sizeof(int)*6);
 133
 134     for(n=0; n<6; n++){
 135         int16_t *ac_val, *ac_val1;
 136
 137         score -= get_block_rate(s, block[n], s->block_last_index[n], s->intra_scantable.permutated);
 138
 139         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
 140         ac_val1= ac_val;
 141         if(dir[n]){
 142             const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
 143             /* top prediction */
 144             ac_val-= s->block_wrap[n]*16;
 145             if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
 146                 /* same qscale */
 147                 for(i=1; i<8; i++){
 148                     const int level= block[n][s->dsp.idct_permutation[i   ]];
 149                     block[n][s->dsp.idct_permutation[i   ]] = level - ac_val[i+8];
 150                     ac_val1[i  ]=    block[n][s->dsp.idct_permutation[i<<3]];
 151                     ac_val1[i+8]= level;
 152                 }
 153             }else{
 154                 /* different qscale, we must rescale */
 155                 for(i=1; i<8; i++){
 156                     const int level= block[n][s->dsp.idct_permutation[i   ]];
 157                     block[n][s->dsp.idct_permutation[i   ]] = level - ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
 158                     ac_val1[i  ]=    block[n][s->dsp.idct_permutation[i<<3]];
 159                     ac_val1[i+8]= level;
 160                 }
 161             }
 162             st[n]= s->intra_h_scantable.permutated;
 163         }else{
 164             const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
 165             /* left prediction */
 166             ac_val-= 16;
 167             if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
 168                 /* same qscale */
 169                 for(i=1; i<8; i++){
 170                     const int level= block[n][s->dsp.idct_permutation[i<<3]];
 171                     block[n][s->dsp.idct_permutation[i<<3]]= level - ac_val[i];
 172                     ac_val1[i  ]= level;
 173                     ac_val1[i+8]=    block[n][s->dsp.idct_permutation[i   ]];
 174                 }
 175             }else{
 176                 /* different qscale, we must rescale */
 177                 for(i=1; i<8; i++){
 178                     const int level= block[n][s->dsp.idct_permutation[i<<3]];
 179                     block[n][s->dsp.idct_permutation[i<<3]]= level - ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
 180                     ac_val1[i  ]= level;
 181                     ac_val1[i+8]=    block[n][s->dsp.idct_permutation[i   ]];
 182                 }
 183             }
 184             st[n]= s->intra_v_scantable.permutated;
 185         }
 186
 187         for(i=63; i>0; i--) //FIXME optimize
 188             if(block[n][ st[n][i] ]) break;
 189         s->block_last_index[n]= i;
 190
 191         score += get_block_rate(s, block[n], s->block_last_index[n], st[n]);
 192     }
 193
 194     if(score < 0){
 195         return 1;
 196     }else{
 197         restore_ac_coeffs(s, block, dir, st, zigzag_last_index);
 198         return 0;
 199     }
 200 }
 201
 202 /**
 203  * modify mb_type & qscale so that encoding is acually possible in mpeg4
 204  */
 205 void ff_clean_mpeg4_qscales(MpegEncContext *s){
 206     int i;
 207     int8_t * const qscale_table = s->current_picture.qscale_table;
 208
 209     ff_clean_h263_qscales(s);
 210
 211     if(s->pict_type== AV_PICTURE_TYPE_B){
 212         int odd=0;
 213         /* ok, come on, this isn't funny anymore, there's more code for handling this mpeg4 mess than for the actual adaptive quantization */
 214
 215         for(i=0; i<s->mb_num; i++){
 216             int mb_xy= s->mb_index2xy[i];
 217             odd += qscale_table[mb_xy]&1;
 218         }
 219
 220         if(2*odd > s->mb_num) odd=1;
 221         else                  odd=0;
 222
 223         for(i=0; i<s->mb_num; i++){
 224             int mb_xy= s->mb_index2xy[i];
 225             if((qscale_table[mb_xy]&1) != odd)
 226                 qscale_table[mb_xy]++;
 227             if(qscale_table[mb_xy] > 31)
 228                 qscale_table[mb_xy]= 31;
 229         }
 230
 231         for(i=1; i<s->mb_num; i++){
 232             int mb_xy= s->mb_index2xy[i];
 233             if(qscale_table[mb_xy] != qscale_table[s->mb_index2xy[i-1]] && (s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_DIRECT)){
 234                 s->mb_type[mb_xy]|= CANDIDATE_MB_TYPE_BIDIR;
 235             }
 236         }
 237     }
 238 }
 239
 240
 241 /**
 242  * Encode the dc value.
 243  * @param n block index (0-3 are luma, 4-5 are chroma)
 244  */
 245 static inline void mpeg4_encode_dc(PutBitContext * s, int level, int n)
 246 {
 247 #if 1
 248     /* DC will overflow if level is outside the [-255,255] range. */
 249     level+=256;
 250     if (n < 4) {
 251         /* luminance */
 252         put_bits(s, uni_DCtab_lum_len[level], uni_DCtab_lum_bits[level]);
 253     } else {
 254         /* chrominance */
 255         put_bits(s, uni_DCtab_chrom_len[level], uni_DCtab_chrom_bits[level]);
 256     }
 257 #else
 258     int size, v;
 259     /* find number of bits */
 260     size = 0;
 261     v = abs(level);
 262     while (v) {
 263         v >>= 1;
 264         size++;
 265     }
 266
 267     if (n < 4) {
 268         /* luminance */
 269         put_bits(&s->pb, ff_mpeg4_DCtab_lum[size][1], ff_mpeg4_DCtab_lum[size][0]);
 270     } else {
 271         /* chrominance */
 272         put_bits(&s->pb, ff_mpeg4_DCtab_chrom[size][1], ff_mpeg4_DCtab_chrom[size][0]);
 273     }
 274
 275     /* encode remaining bits */
 276     if (size > 0) {
 277         if (level < 0)
 278             level = (-level) ^ ((1 << size) - 1);
 279         put_bits(&s->pb, size, level);
 280         if (size > 8)
 281             put_bits(&s->pb, 1, 1);
 282     }
 283 #endif
 284 }
 285
 286 static inline int mpeg4_get_dc_length(int level, int n){
 287     if (n < 4) {
 288         return uni_DCtab_lum_len[level + 256];
 289     } else {
 290         return uni_DCtab_chrom_len[level + 256];
 291     }
 292 }
 293
 294 /**
 295  * Encode an 8x8 block.
 296  * @param n block index (0-3 are luma, 4-5 are chroma)
 297  */
 298 static inline void mpeg4_encode_block(MpegEncContext * s, int16_t * block, int n, int intra_dc,
 299                                uint8_t *scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb)
 300 {
 301     int i, last_non_zero;
 302     uint32_t *bits_tab;
 303     uint8_t *len_tab;
 304     const int last_index = s->block_last_index[n];
 305
 306     if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
 307         /* mpeg4 based DC predictor */
 308         mpeg4_encode_dc(dc_pb, intra_dc, n);
 309         if(last_index<1) return;
 310         i = 1;
 311         bits_tab= uni_mpeg4_intra_rl_bits;
 312         len_tab = uni_mpeg4_intra_rl_len;
 313     } else {
 314         if(last_index<0) return;
 315         i = 0;
 316         bits_tab= uni_mpeg4_inter_rl_bits;
 317         len_tab = uni_mpeg4_inter_rl_len;
 318     }
 319
 320     /* AC coefs */
 321     last_non_zero = i - 1;
 322     for (; i < last_index; i++) {
 323         int level = block[ scan_table[i] ];
 324         if (level) {
 325             int run = i - last_non_zero - 1;
 326             level+=64;
 327             if((level&(~127)) == 0){
 328                 const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
 329                 put_bits(ac_pb, len_tab[index], bits_tab[index]);
 330             }else{ //ESC3
 331                 put_bits(ac_pb, 7+2+1+6+1+12+1, (3<<23)+(3<<21)+(0<<20)+(run<<14)+(1<<13)+(((level-64)&0xfff)<<1)+1);
 332             }
 333             last_non_zero = i;
 334         }
 335     }
 336     /*if(i<=last_index)*/{
 337         int level = block[ scan_table[i] ];
 338         int run = i - last_non_zero - 1;
 339         level+=64;
 340         if((level&(~127)) == 0){
 341             const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
 342             put_bits(ac_pb, len_tab[index], bits_tab[index]);
 343         }else{ //ESC3
 344             put_bits(ac_pb, 7+2+1+6+1+12+1, (3<<23)+(3<<21)+(1<<20)+(run<<14)+(1<<13)+(((level-64)&0xfff)<<1)+1);
 345         }
 346     }
 347 }
 348
 349 static int mpeg4_get_block_length(MpegEncContext * s, int16_t * block, int n, int intra_dc,
 350                                uint8_t *scan_table)
 351 {
 352     int i, last_non_zero;
 353     uint8_t *len_tab;
 354     const int last_index = s->block_last_index[n];
 355     int len=0;
 356
 357     if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
 358         /* mpeg4 based DC predictor */
 359         len += mpeg4_get_dc_length(intra_dc, n);
 360         if(last_index<1) return len;
 361         i = 1;
 362         len_tab = uni_mpeg4_intra_rl_len;
 363     } else {
 364         if(last_index<0) return 0;
 365         i = 0;
 366         len_tab = uni_mpeg4_inter_rl_len;
 367     }
 368
 369     /* AC coefs */
 370     last_non_zero = i - 1;
 371     for (; i < last_index; i++) {
 372         int level = block[ scan_table[i] ];
 373         if (level) {
 374             int run = i - last_non_zero - 1;
 375             level+=64;
 376             if((level&(~127)) == 0){
 377                 const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
 378                 len += len_tab[index];
 379             }else{ //ESC3
 380                 len += 7+2+1+6+1+12+1;
 381             }
 382             last_non_zero = i;
 383         }
 384     }
 385     /*if(i<=last_index)*/{
 386         int level = block[ scan_table[i] ];
 387         int run = i - last_non_zero - 1;
 388         level+=64;
 389         if((level&(~127)) == 0){
 390             const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
 391             len += len_tab[index];
 392         }else{ //ESC3
 393             len += 7+2+1+6+1+12+1;
 394         }
 395     }
 396
 397     return len;
 398 }
 399
 400 static inline void mpeg4_encode_blocks(MpegEncContext * s, int16_t block[6][64], int intra_dc[6],
 401                                uint8_t **scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb){
 402     int i;
 403
 404     if(scan_table){
 405         if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
 406             for (i = 0; i < 6; i++) {
 407                 skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, intra_dc[i], scan_table[i]));
 408             }
 409         }else{
 410             /* encode each block */
 411             for (i = 0; i < 6; i++) {
 412                 mpeg4_encode_block(s, block[i], i, intra_dc[i], scan_table[i], dc_pb, ac_pb);
 413             }
 414         }
 415     }else{
 416         if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
 417             for (i = 0; i < 6; i++) {
 418                 skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, 0, s->intra_scantable.permutated));
 419             }
 420         }else{
 421             /* encode each block */
 422             for (i = 0; i < 6; i++) {
 423                 mpeg4_encode_block(s, block[i], i, 0, s->intra_scantable.permutated, dc_pb, ac_pb);
 424             }
 425         }
 426     }
 427 }
 428
 429 static inline int get_b_cbp(MpegEncContext * s, int16_t block[6][64],
 430                             int motion_x, int motion_y, int mb_type)
 431 {
 432     int cbp = 0, i;
 433
 434     if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {
 435         int score = 0;
 436         const int lambda = s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
 437
 438         for (i = 0; i < 6; i++)
 439             if (s->coded_score[i] < 0) {
 440                 score += s->coded_score[i];
 441                 cbp   |= 1 << (5 - i);
 442             }
 443
 444         if (cbp) {
 445             int zero_score = -6;
 446             if ((motion_x | motion_y | s->dquant | mb_type) == 0)
 447                 zero_score -= 4; //2*MV + mb_type + cbp bit
 448
 449             zero_score *= lambda;
 450             if (zero_score <= score)
 451                 cbp = 0;
 452         }
 453
 454         for (i = 0; i < 6; i++) {
 455             if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i)) & 1) == 0) {
 456                 s->block_last_index[i] = -1;
 457                 s->dsp.clear_block(s->block[i]);
 458             }
 459         }
 460     } else {
 461         for (i = 0; i < 6; i++) {
 462             if (s->block_last_index[i] >= 0)
 463                 cbp |= 1 << (5 - i);
 464         }
 465     }
 466     return cbp;
 467 }
 468
 469 //FIXME this is duplicated to h263.c
 470 static const int dquant_code[5]= {1,0,9,2,3};
 471
 472 void ff_mpeg4_encode_mb(MpegEncContext * s,
 473                         int16_t block[6][64],
 474                         int motion_x, int motion_y)
 475 {
 476     int cbpc, cbpy, pred_x, pred_y;
 477     PutBitContext * const pb2    = s->data_partitioning                         ? &s->pb2    : &s->pb;
 478     PutBitContext * const tex_pb = s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B ? &s->tex_pb : &s->pb;
 479     PutBitContext * const dc_pb  = s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_I ? &s->pb2    : &s->pb;
 480     const int interleaved_stats= (s->flags&CODEC_FLAG_PASS1) && !s->data_partitioning ? 1 : 0;
 481
 482     if (!s->mb_intra) {
 483         int i, cbp;
 484
 485         if(s->pict_type==AV_PICTURE_TYPE_B){
 486             static const int mb_type_table[8]= {-1, 3, 2, 1,-1,-1,-1, 0}; /* convert from mv_dir to type */
 487             int mb_type=  mb_type_table[s->mv_dir];
 488
 489             if(s->mb_x==0){
 490                 for(i=0; i<2; i++){
 491                     s->last_mv[i][0][0]=
 492                     s->last_mv[i][0][1]=
 493                     s->last_mv[i][1][0]=
 494                     s->last_mv[i][1][1]= 0;
 495                 }
 496             }
 497
 498             assert(s->dquant>=-2 && s->dquant<=2);
 499             assert((s->dquant&1)==0);
 500             assert(mb_type>=0);
 501
 502             /* nothing to do if this MB was skipped in the next P Frame */
 503             if (s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]) { //FIXME avoid DCT & ...
 504                 s->skip_count++;
 505                 s->mv[0][0][0]=
 506                 s->mv[0][0][1]=
 507                 s->mv[1][0][0]=
 508                 s->mv[1][0][1]= 0;
 509                 s->mv_dir= MV_DIR_FORWARD; //doesn't matter
 510                 s->qscale -= s->dquant;
 511 //                s->mb_skipped=1;
 512
 513                 return;
 514             }
 515
 516             cbp= get_b_cbp(s, block, motion_x, motion_y, mb_type);
 517
 518             if ((cbp | motion_x | motion_y | mb_type) ==0) {
 519                 /* direct MB with MV={0,0} */
 520                 assert(s->dquant==0);
 521
 522                 put_bits(&s->pb, 1, 1); /* mb not coded modb1=1 */
 523
 524                 if(interleaved_stats){
 525                     s->misc_bits++;
 526                     s->last_bits++;
 527                 }
 528                 s->skip_count++;
 529                 return;
 530             }
 531
 532             put_bits(&s->pb, 1, 0);     /* mb coded modb1=0 */
 533             put_bits(&s->pb, 1, cbp ? 0 : 1); /* modb2 */ //FIXME merge
 534             put_bits(&s->pb, mb_type+1, 1); // this table is so simple that we don't need it :)
 535             if(cbp) put_bits(&s->pb, 6, cbp);
 536
 537             if(cbp && mb_type){
 538                 if(s->dquant)
 539                     put_bits(&s->pb, 2, (s->dquant>>2)+3);
 540                 else
 541                     put_bits(&s->pb, 1, 0);
 542             }else
 543                 s->qscale -= s->dquant;
 544
 545             if(!s->progressive_sequence){
 546                 if(cbp)
 547                     put_bits(&s->pb, 1, s->interlaced_dct);
 548                 if(mb_type) // not direct mode
 549                     put_bits(&s->pb, 1, s->mv_type == MV_TYPE_FIELD);
 550             }
 551
 552             if(interleaved_stats){
 553                 s->misc_bits+= get_bits_diff(s);
 554             }
 555
 556             if(mb_type == 0){
 557                 assert(s->mv_dir & MV_DIRECT);
 558                 ff_h263_encode_motion_vector(s, motion_x, motion_y, 1);
 559                 s->b_count++;
 560                 s->f_count++;
 561             }else{
 562                 assert(mb_type > 0 && mb_type < 4);
 563                 if(s->mv_type != MV_TYPE_FIELD){
 564                     if(s->mv_dir & MV_DIR_FORWARD){
 565                         ff_h263_encode_motion_vector(s, s->mv[0][0][0] - s->last_mv[0][0][0],
 566                                                         s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 567                         s->last_mv[0][0][0]= s->last_mv[0][1][0]= s->mv[0][0][0];
 568                         s->last_mv[0][0][1]= s->last_mv[0][1][1]= s->mv[0][0][1];
 569                         s->f_count++;
 570                     }
 571                     if(s->mv_dir & MV_DIR_BACKWARD){
 572                         ff_h263_encode_motion_vector(s, s->mv[1][0][0] - s->last_mv[1][0][0],
 573                                                         s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 574                         s->last_mv[1][0][0]= s->last_mv[1][1][0]= s->mv[1][0][0];
 575                         s->last_mv[1][0][1]= s->last_mv[1][1][1]= s->mv[1][0][1];
 576                         s->b_count++;
 577                     }
 578                 }else{
 579                     if(s->mv_dir & MV_DIR_FORWARD){
 580                         put_bits(&s->pb, 1, s->field_select[0][0]);
 581                         put_bits(&s->pb, 1, s->field_select[0][1]);
 582                     }
 583                     if(s->mv_dir & MV_DIR_BACKWARD){
 584                         put_bits(&s->pb, 1, s->field_select[1][0]);
 585                         put_bits(&s->pb, 1, s->field_select[1][1]);
 586                     }
 587                     if(s->mv_dir & MV_DIR_FORWARD){
 588                         for(i=0; i<2; i++){
 589                             ff_h263_encode_motion_vector(s, s->mv[0][i][0] - s->last_mv[0][i][0]  ,
 590                                                             s->mv[0][i][1] - s->last_mv[0][i][1]/2, s->f_code);
 591                             s->last_mv[0][i][0]= s->mv[0][i][0];
 592                             s->last_mv[0][i][1]= s->mv[0][i][1]*2;
 593                         }
 594                         s->f_count++;
 595                     }
 596                     if(s->mv_dir & MV_DIR_BACKWARD){
 597                         for(i=0; i<2; i++){
 598                             ff_h263_encode_motion_vector(s, s->mv[1][i][0] - s->last_mv[1][i][0]  ,
 599                                                             s->mv[1][i][1] - s->last_mv[1][i][1]/2, s->b_code);
 600                             s->last_mv[1][i][0]= s->mv[1][i][0];
 601                             s->last_mv[1][i][1]= s->mv[1][i][1]*2;
 602                         }
 603                         s->b_count++;
 604                     }
 605                 }
 606             }
 607
 608             if(interleaved_stats){
 609                 s->mv_bits+= get_bits_diff(s);
 610             }
 611
 612             mpeg4_encode_blocks(s, block, NULL, NULL, NULL, &s->pb);
 613
 614             if(interleaved_stats){
 615                 s->p_tex_bits+= get_bits_diff(s);
 616             }
 617
 618         }else{ /* s->pict_type==AV_PICTURE_TYPE_B */
 619             cbp= get_p_cbp(s, block, motion_x, motion_y);
 620
 621             if ((cbp | motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16) {
 622                 /* check if the B frames can skip it too, as we must skip it if we skip here
 623                    why didn't they just compress the skip-mb bits instead of reusing them ?! */
 624                 if(s->max_b_frames>0){
 625                     int i;
 626                     int x,y, offset;
 627                     uint8_t *p_pic;
 628
 629                     x= s->mb_x*16;
 630                     y= s->mb_y*16;
 631                     if(x+16 > s->width)  x= s->width-16;
 632                     if(y+16 > s->height) y= s->height-16;
 633
 634                     offset= x + y*s->linesize;
 635                     p_pic = s->new_picture.f.data[0] + offset;
 636
 637                     s->mb_skipped=1;
 638                     for(i=0; i<s->max_b_frames; i++){
 639                         uint8_t *b_pic;
 640                         int diff;
 641                         Picture *pic= s->reordered_input_picture[i+1];
 642
 643                         if (pic == NULL || pic->f.pict_type != AV_PICTURE_TYPE_B)
 644                             break;
 645
 646                         b_pic = pic->f.data[0] + offset;
 647                         if (!pic->shared)
 648                             b_pic+= INPLACE_OFFSET;
 649                         diff= s->dsp.sad[0](NULL, p_pic, b_pic, s->linesize, 16);
 650                         if(diff>s->qscale*70){ //FIXME check that 70 is optimal
 651                             s->mb_skipped=0;
 652                             break;
 653                         }
 654                     }
 655                 }else
 656                     s->mb_skipped=1;
 657
 658                 if(s->mb_skipped==1){
 659                     /* skip macroblock */
 660                     put_bits(&s->pb, 1, 1);
 661
 662                     if(interleaved_stats){
 663                         s->misc_bits++;
 664                         s->last_bits++;
 665                     }
 666                     s->skip_count++;
 667
 668                     return;
 669                 }
 670             }
 671
 672             put_bits(&s->pb, 1, 0);     /* mb coded */
 673             cbpc = cbp & 3;
 674             cbpy = cbp >> 2;
 675             cbpy ^= 0xf;
 676             if(s->mv_type==MV_TYPE_16X16){
 677                 if(s->dquant) cbpc+= 8;
 678                 put_bits(&s->pb,
 679                         ff_h263_inter_MCBPC_bits[cbpc],
 680                         ff_h263_inter_MCBPC_code[cbpc]);
 681
 682                 put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
 683                 if(s->dquant)
 684                     put_bits(pb2, 2, dquant_code[s->dquant+2]);
 685
 686                 if(!s->progressive_sequence){
 687                     if(cbp)
 688                         put_bits(pb2, 1, s->interlaced_dct);
 689                     put_bits(pb2, 1, 0);
 690                 }
 691
 692                 if(interleaved_stats){
 693                     s->misc_bits+= get_bits_diff(s);
 694                 }
 695
 696                 /* motion vectors: 16x16 mode */
 697                 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
 698
 699                 ff_h263_encode_motion_vector(s, motion_x - pred_x,
 700                                                 motion_y - pred_y, s->f_code);
 701             }else if(s->mv_type==MV_TYPE_FIELD){
 702                 if(s->dquant) cbpc+= 8;
 703                 put_bits(&s->pb,
 704                         ff_h263_inter_MCBPC_bits[cbpc],
 705                         ff_h263_inter_MCBPC_code[cbpc]);
 706
 707                 put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
 708                 if(s->dquant)
 709                     put_bits(pb2, 2, dquant_code[s->dquant+2]);
 710
 711                 assert(!s->progressive_sequence);
 712                 if(cbp)
 713                     put_bits(pb2, 1, s->interlaced_dct);
 714                 put_bits(pb2, 1, 1);
 715
 716                 if(interleaved_stats){
 717                     s->misc_bits+= get_bits_diff(s);
 718                 }
 719
 720                 /* motion vectors: 16x8 interlaced mode */
 721                 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
 722                 pred_y /=2;
 723
 724                 put_bits(&s->pb, 1, s->field_select[0][0]);
 725                 put_bits(&s->pb, 1, s->field_select[0][1]);
 726
 727                 ff_h263_encode_motion_vector(s, s->mv[0][0][0] - pred_x,
 728                                                 s->mv[0][0][1] - pred_y, s->f_code);
 729                 ff_h263_encode_motion_vector(s, s->mv[0][1][0] - pred_x,
 730                                                 s->mv[0][1][1] - pred_y, s->f_code);
 731             }else{
 732                 assert(s->mv_type==MV_TYPE_8X8);
 733                 put_bits(&s->pb,
 734                         ff_h263_inter_MCBPC_bits[cbpc+16],
 735                         ff_h263_inter_MCBPC_code[cbpc+16]);
 736                 put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
 737
 738                 if(!s->progressive_sequence){
 739                     if(cbp)
 740                         put_bits(pb2, 1, s->interlaced_dct);
 741                 }
 742
 743                 if(interleaved_stats){
 744                     s->misc_bits+= get_bits_diff(s);
 745                 }
 746
 747                 for(i=0; i<4; i++){
 748                     /* motion vectors: 8x8 mode*/
 749                     ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
 750
 751                     ff_h263_encode_motion_vector(s, s->current_picture.motion_val[0][ s->block_index[i] ][0] - pred_x,
 752                                                     s->current_picture.motion_val[0][ s->block_index[i] ][1] - pred_y, s->f_code);
 753                 }
 754             }
 755
 756             if(interleaved_stats){
 757                 s->mv_bits+= get_bits_diff(s);
 758             }
 759
 760             mpeg4_encode_blocks(s, block, NULL, NULL, NULL, tex_pb);
 761
 762             if(interleaved_stats){
 763                 s->p_tex_bits+= get_bits_diff(s);
 764             }
 765             s->f_count++;
 766         }
 767     } else {
 768         int cbp;
 769         int dc_diff[6];   //dc values with the dc prediction subtracted
 770         int dir[6];  //prediction direction
 771         int zigzag_last_index[6];
 772         uint8_t *scan_table[6];
 773         int i;
 774
 775         for(i=0; i<6; i++){
 776             dc_diff[i]= ff_mpeg4_pred_dc(s, i, block[i][0], &dir[i], 1);
 777         }
 778
 779         if(s->flags & CODEC_FLAG_AC_PRED){
 780             s->ac_pred= decide_ac_pred(s, block, dir, scan_table, zigzag_last_index);
 781         }else{
 782             for(i=0; i<6; i++)
 783                 scan_table[i]= s->intra_scantable.permutated;
 784         }
 785
 786         /* compute cbp */
 787         cbp = 0;
 788         for (i = 0; i < 6; i++) {
 789             if (s->block_last_index[i] >= 1)
 790                 cbp |= 1 << (5 - i);
 791         }
 792
 793         cbpc = cbp & 3;
 794         if (s->pict_type == AV_PICTURE_TYPE_I) {
 795             if(s->dquant) cbpc+=4;
 796             put_bits(&s->pb,
 797                 ff_h263_intra_MCBPC_bits[cbpc],
 798                 ff_h263_intra_MCBPC_code[cbpc]);
 799         } else {
 800             if(s->dquant) cbpc+=8;
 801             put_bits(&s->pb, 1, 0);     /* mb coded */
 802             put_bits(&s->pb,
 803                 ff_h263_inter_MCBPC_bits[cbpc + 4],
 804                 ff_h263_inter_MCBPC_code[cbpc + 4]);
 805         }
 806         put_bits(pb2, 1, s->ac_pred);
 807         cbpy = cbp >> 2;
 808         put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
 809         if(s->dquant)
 810             put_bits(dc_pb, 2, dquant_code[s->dquant+2]);
 811
 812         if(!s->progressive_sequence){
 813             put_bits(dc_pb, 1, s->interlaced_dct);
 814         }
 815
 816         if(interleaved_stats){
 817             s->misc_bits+= get_bits_diff(s);
 818         }
 819
 820         mpeg4_encode_blocks(s, block, dc_diff, scan_table, dc_pb, tex_pb);
 821
 822         if(interleaved_stats){
 823             s->i_tex_bits+= get_bits_diff(s);
 824         }
 825         s->i_count++;
 826
 827         /* restore ac coeffs & last_index stuff if we messed them up with the prediction */
 828         if(s->ac_pred)
 829             restore_ac_coeffs(s, block, dir, scan_table, zigzag_last_index);
 830     }
 831 }
 832
 833 /**
 834  * add mpeg4 stuffing bits (01...1)
 835  */
 836 void ff_mpeg4_stuffing(PutBitContext * pbc)
 837 {
 838     int length;
 839     put_bits(pbc, 1, 0);
 840     length= (-put_bits_count(pbc))&7;
 841     if(length) put_bits(pbc, length, (1<<length)-1);
 842 }
 843
 844 /* must be called before writing the header */
 845 void ff_set_mpeg4_time(MpegEncContext * s){
 846     if(s->pict_type==AV_PICTURE_TYPE_B){
 847         ff_mpeg4_init_direct_mv(s);
 848     }else{
 849         s->last_time_base= s->time_base;
 850         s->time_base= s->time/s->avctx->time_base.den;
 851     }
 852 }
 853
 854 static void mpeg4_encode_gop_header(MpegEncContext * s){
 855     int hours, minutes, seconds;
 856     int64_t time;
 857
 858     put_bits(&s->pb, 16, 0);
 859     put_bits(&s->pb, 16, GOP_STARTCODE);
 860
 861     time = s->current_picture_ptr->f.pts;
 862     if(s->reordered_input_picture[1])
 863         time = FFMIN(time, s->reordered_input_picture[1]->f.pts);
 864     time= time*s->avctx->time_base.num;
 865
 866     seconds= time/s->avctx->time_base.den;
 867     minutes= seconds/60; seconds %= 60;
 868     hours= minutes/60; minutes %= 60;
 869     hours%=24;
 870
 871     put_bits(&s->pb, 5, hours);
 872     put_bits(&s->pb, 6, minutes);
 873     put_bits(&s->pb, 1, 1);
 874     put_bits(&s->pb, 6, seconds);
 875
 876     put_bits(&s->pb, 1, !!(s->flags&CODEC_FLAG_CLOSED_GOP));
 877     put_bits(&s->pb, 1, 0); //broken link == NO
 878
 879     s->last_time_base= time / s->avctx->time_base.den;
 880
 881     ff_mpeg4_stuffing(&s->pb);
 882 }
 883
 884 static void mpeg4_encode_visual_object_header(MpegEncContext * s){
 885     int profile_and_level_indication;
 886     int vo_ver_id;
 887
 888     if(s->avctx->profile != FF_PROFILE_UNKNOWN){
 889         profile_and_level_indication = s->avctx->profile << 4;
 890     }else if(s->max_b_frames || s->quarter_sample){
 891         profile_and_level_indication= 0xF0; // adv simple
 892     }else{
 893         profile_and_level_indication= 0x00; // simple
 894     }
 895
 896     if(s->avctx->level != FF_LEVEL_UNKNOWN){
 897         profile_and_level_indication |= s->avctx->level;
 898     }else{
 899         profile_and_level_indication |= 1; //level 1
 900     }
 901
 902     if(profile_and_level_indication>>4 == 0xF){
 903         vo_ver_id= 5;
 904     }else{
 905         vo_ver_id= 1;
 906     }
 907
 908     //FIXME levels
 909
 910     put_bits(&s->pb, 16, 0);
 911     put_bits(&s->pb, 16, VOS_STARTCODE);
 912
 913     put_bits(&s->pb, 8, profile_and_level_indication);
 914
 915     put_bits(&s->pb, 16, 0);
 916     put_bits(&s->pb, 16, VISUAL_OBJ_STARTCODE);
 917
 918     put_bits(&s->pb, 1, 1);
 919         put_bits(&s->pb, 4, vo_ver_id);
 920         put_bits(&s->pb, 3, 1); //priority
 921
 922     put_bits(&s->pb, 4, 1); //visual obj type== video obj
 923
 924     put_bits(&s->pb, 1, 0); //video signal type == no clue //FIXME
 925
 926     ff_mpeg4_stuffing(&s->pb);
 927 }
 928
 929 static void mpeg4_encode_vol_header(MpegEncContext * s, int vo_number, int vol_number)
 930 {
 931     int vo_ver_id;
 932
 933     if (!CONFIG_MPEG4_ENCODER)  return;
 934
 935     if(s->max_b_frames || s->quarter_sample){
 936         vo_ver_id= 5;
 937         s->vo_type= ADV_SIMPLE_VO_TYPE;
 938     }else{
 939         vo_ver_id= 1;
 940         s->vo_type= SIMPLE_VO_TYPE;
 941     }
 942
 943     put_bits(&s->pb, 16, 0);
 944     put_bits(&s->pb, 16, 0x100 + vo_number);        /* video obj */
 945     put_bits(&s->pb, 16, 0);
 946     put_bits(&s->pb, 16, 0x120 + vol_number);       /* video obj layer */
 947
 948     put_bits(&s->pb, 1, 0);             /* random access vol */
 949     put_bits(&s->pb, 8, s->vo_type);    /* video obj type indication */
 950     if(s->workaround_bugs & FF_BUG_MS) {
 951         put_bits(&s->pb, 1, 0);         /* is obj layer id= no */
 952     } else {
 953         put_bits(&s->pb, 1, 1);         /* is obj layer id= yes */
 954         put_bits(&s->pb, 4, vo_ver_id); /* is obj layer ver id */
 955         put_bits(&s->pb, 3, 1);         /* is obj layer priority */
 956     }
 957
 958     s->aspect_ratio_info= ff_h263_aspect_to_info(s->avctx->sample_aspect_ratio);
 959
 960     put_bits(&s->pb, 4, s->aspect_ratio_info);/* aspect ratio info */
 961     if (s->aspect_ratio_info == FF_ASPECT_EXTENDED){
 962         put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.num);
 963         put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.den);
 964     }
 965
 966     if(s->workaround_bugs & FF_BUG_MS) { //
 967         put_bits(&s->pb, 1, 0);         /* vol control parameters= no @@@ */
 968     } else {
 969         put_bits(&s->pb, 1, 1);         /* vol control parameters= yes */
 970         put_bits(&s->pb, 2, 1);         /* chroma format YUV 420/YV12 */
 971         put_bits(&s->pb, 1, s->low_delay);
 972         put_bits(&s->pb, 1, 0);         /* vbv parameters= no */
 973     }
 974
 975     put_bits(&s->pb, 2, RECT_SHAPE);    /* vol shape= rectangle */
 976     put_bits(&s->pb, 1, 1);             /* marker bit */
 977
 978     put_bits(&s->pb, 16, s->avctx->time_base.den);
 979     if (s->time_increment_bits < 1)
 980         s->time_increment_bits = 1;
 981     put_bits(&s->pb, 1, 1);             /* marker bit */
 982     put_bits(&s->pb, 1, 0);             /* fixed vop rate=no */
 983     put_bits(&s->pb, 1, 1);             /* marker bit */
 984     put_bits(&s->pb, 13, s->width);     /* vol width */
 985     put_bits(&s->pb, 1, 1);             /* marker bit */
 986     put_bits(&s->pb, 13, s->height);    /* vol height */
 987     put_bits(&s->pb, 1, 1);             /* marker bit */
 988     put_bits(&s->pb, 1, s->progressive_sequence ? 0 : 1);
 989     put_bits(&s->pb, 1, 1);             /* obmc disable */
 990     if (vo_ver_id == 1) {
 991         put_bits(&s->pb, 1, s->vol_sprite_usage);       /* sprite enable */
 992     }else{
 993         put_bits(&s->pb, 2, s->vol_sprite_usage);       /* sprite enable */
 994     }
 995
 996     put_bits(&s->pb, 1, 0);             /* not 8 bit == false */
 997     put_bits(&s->pb, 1, s->mpeg_quant); /* quant type= (0=h263 style)*/
 998
 999     if(s->mpeg_quant){
1000         ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
1001         ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
1002     }
1003
1004     if (vo_ver_id != 1)
1005         put_bits(&s->pb, 1, s->quarter_sample);
1006     put_bits(&s->pb, 1, 1);             /* complexity estimation disable */
1007     s->resync_marker= s->rtp_mode;
1008     put_bits(&s->pb, 1, s->resync_marker ? 0 : 1);/* resync marker disable */
1009     put_bits(&s->pb, 1, s->data_partitioning ? 1 : 0);
1010     if(s->data_partitioning){
1011         put_bits(&s->pb, 1, 0);         /* no rvlc */
1012     }
1013
1014     if (vo_ver_id != 1){
1015         put_bits(&s->pb, 1, 0);         /* newpred */
1016         put_bits(&s->pb, 1, 0);         /* reduced res vop */
1017     }
1018     put_bits(&s->pb, 1, 0);             /* scalability */
1019
1020     ff_mpeg4_stuffing(&s->pb);
1021
1022     /* user data */
1023     if(!(s->flags & CODEC_FLAG_BITEXACT)){
1024         put_bits(&s->pb, 16, 0);
1025         put_bits(&s->pb, 16, 0x1B2);    /* user_data */
1026         avpriv_put_string(&s->pb, LIBAVCODEC_IDENT, 0);
1027     }
1028 }
1029
1030 /* write mpeg4 VOP header */
1031 void ff_mpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
1032 {
1033     int time_incr;
1034     int time_div, time_mod;
1035
1036     if(s->pict_type==AV_PICTURE_TYPE_I){
1037         if(!(s->flags&CODEC_FLAG_GLOBAL_HEADER)){
1038             if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT) //HACK, the reference sw is buggy
1039                 mpeg4_encode_visual_object_header(s);
1040             if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT || picture_number==0) //HACK, the reference sw is buggy
1041                 mpeg4_encode_vol_header(s, 0, 0);
1042         }
1043         if(!(s->workaround_bugs & FF_BUG_MS))
1044             mpeg4_encode_gop_header(s);
1045     }
1046
1047     s->partitioned_frame= s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B;
1048
1049     put_bits(&s->pb, 16, 0);                /* vop header */
1050     put_bits(&s->pb, 16, VOP_STARTCODE);    /* vop header */
1051     put_bits(&s->pb, 2, s->pict_type - 1);  /* pict type: I = 0 , P = 1 */
1052
1053     assert(s->time>=0);
1054     time_div= s->time/s->avctx->time_base.den;
1055     time_mod= s->time%s->avctx->time_base.den;
1056     time_incr= time_div - s->last_time_base;
1057     assert(time_incr >= 0);
1058     while(time_incr--)
1059         put_bits(&s->pb, 1, 1);
1060
1061     put_bits(&s->pb, 1, 0);
1062
1063     put_bits(&s->pb, 1, 1);                             /* marker */
1064     put_bits(&s->pb, s->time_increment_bits, time_mod); /* time increment */
1065     put_bits(&s->pb, 1, 1);                             /* marker */
1066     put_bits(&s->pb, 1, 1);                             /* vop coded */
1067     if (    s->pict_type == AV_PICTURE_TYPE_P
1068         || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE)) {
1069         put_bits(&s->pb, 1, s->no_rounding);    /* rounding type */
1070     }
1071     put_bits(&s->pb, 3, 0);     /* intra dc VLC threshold */
1072     if(!s->progressive_sequence){
1073          put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
1074          put_bits(&s->pb, 1, s->alternate_scan);
1075     }
1076     //FIXME sprite stuff
1077
1078     put_bits(&s->pb, 5, s->qscale);
1079
1080     if (s->pict_type != AV_PICTURE_TYPE_I)
1081         put_bits(&s->pb, 3, s->f_code); /* fcode_for */
1082     if (s->pict_type == AV_PICTURE_TYPE_B)
1083         put_bits(&s->pb, 3, s->b_code); /* fcode_back */
1084 }
1085
1086
1087 static av_cold void init_uni_dc_tab(void)
1088 {
1089     int level, uni_code, uni_len;
1090
1091     for(level=-256; level<256; level++){
1092         int size, v, l;
1093         /* find number of bits */
1094         size = 0;
1095         v = abs(level);
1096         while (v) {
1097             v >>= 1;
1098             size++;
1099         }
1100
1101         if (level < 0)
1102             l= (-level) ^ ((1 << size) - 1);
1103         else
1104             l= level;
1105
1106         /* luminance */
1107         uni_code= ff_mpeg4_DCtab_lum[size][0];
1108         uni_len = ff_mpeg4_DCtab_lum[size][1];
1109
1110         if (size > 0) {
1111             uni_code<<=size; uni_code|=l;
1112             uni_len+=size;
1113             if (size > 8){
1114                 uni_code<<=1; uni_code|=1;
1115                 uni_len++;
1116             }
1117         }
1118         uni_DCtab_lum_bits[level+256]= uni_code;
1119         uni_DCtab_lum_len [level+256]= uni_len;
1120
1121         /* chrominance */
1122         uni_code= ff_mpeg4_DCtab_chrom[size][0];
1123         uni_len = ff_mpeg4_DCtab_chrom[size][1];
1124
1125         if (size > 0) {
1126             uni_code<<=size; uni_code|=l;
1127             uni_len+=size;
1128             if (size > 8){
1129                 uni_code<<=1; uni_code|=1;
1130                 uni_len++;
1131             }
1132         }
1133         uni_DCtab_chrom_bits[level+256]= uni_code;
1134         uni_DCtab_chrom_len [level+256]= uni_len;
1135
1136     }
1137 }
1138
1139 static av_cold void init_uni_mpeg4_rl_tab(RLTable *rl, uint32_t *bits_tab,
1140                                           uint8_t *len_tab)
1141 {
1142     int slevel, run, last;
1143
1144     assert(MAX_LEVEL >= 64);
1145     assert(MAX_RUN   >= 63);
1146
1147     for(slevel=-64; slevel<64; slevel++){
1148         if(slevel==0) continue;
1149         for(run=0; run<64; run++){
1150             for(last=0; last<=1; last++){
1151                 const int index= UNI_MPEG4_ENC_INDEX(last, run, slevel+64);
1152                 int level= slevel < 0 ? -slevel : slevel;
1153                 int sign= slevel < 0 ? 1 : 0;
1154                 int bits, len, code;
1155                 int level1, run1;
1156
1157                 len_tab[index]= 100;
1158
1159                 /* ESC0 */
1160                 code= get_rl_index(rl, last, run, level);
1161                 bits= rl->table_vlc[code][0];
1162                 len=  rl->table_vlc[code][1];
1163                 bits=bits*2+sign; len++;
1164
1165                 if(code!=rl->n && len < len_tab[index]){
1166                     bits_tab[index]= bits;
1167                     len_tab [index]= len;
1168                 }
1169                 /* ESC1 */
1170                 bits= rl->table_vlc[rl->n][0];
1171                 len=  rl->table_vlc[rl->n][1];
1172                 bits=bits*2;    len++; //esc1
1173                 level1= level - rl->max_level[last][run];
1174                 if(level1>0){
1175                     code= get_rl_index(rl, last, run, level1);
1176                     bits<<= rl->table_vlc[code][1];
1177                     len  += rl->table_vlc[code][1];
1178                     bits += rl->table_vlc[code][0];
1179                     bits=bits*2+sign; len++;
1180
1181                     if(code!=rl->n && len < len_tab[index]){
1182                         bits_tab[index]= bits;
1183                         len_tab [index]= len;
1184                     }
1185                 }
1186                 /* ESC2 */
1187                 bits= rl->table_vlc[rl->n][0];
1188                 len=  rl->table_vlc[rl->n][1];
1189                 bits=bits*4+2;    len+=2; //esc2
1190                 run1 = run - rl->max_run[last][level] - 1;
1191                 if(run1>=0){
1192                     code= get_rl_index(rl, last, run1, level);
1193                     bits<<= rl->table_vlc[code][1];
1194                     len  += rl->table_vlc[code][1];
1195                     bits += rl->table_vlc[code][0];
1196                     bits=bits*2+sign; len++;
1197
1198                     if(code!=rl->n && len < len_tab[index]){
1199                         bits_tab[index]= bits;
1200                         len_tab [index]= len;
1201                     }
1202                 }
1203                 /* ESC3 */
1204                 bits= rl->table_vlc[rl->n][0];
1205                 len = rl->table_vlc[rl->n][1];
1206                 bits=bits*4+3;    len+=2; //esc3
1207                 bits=bits*2+last; len++;
1208                 bits=bits*64+run; len+=6;
1209                 bits=bits*2+1;    len++;  //marker
1210                 bits=bits*4096+(slevel&0xfff); len+=12;
1211                 bits=bits*2+1;    len++;  //marker
1212
1213                 if(len < len_tab[index]){
1214                     bits_tab[index]= bits;
1215                     len_tab [index]= len;
1216                 }
1217             }
1218         }
1219     }
1220 }
1221
1222 static av_cold int encode_init(AVCodecContext *avctx)
1223 {
1224     MpegEncContext *s = avctx->priv_data;
1225     int ret;
1226     static int done = 0;
1227
1228     if((ret=ff_MPV_encode_init(avctx)) < 0)
1229         return ret;
1230
1231     if (!done) {
1232         done = 1;
1233
1234         init_uni_dc_tab();
1235
1236         ff_init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
1237
1238         init_uni_mpeg4_rl_tab(&ff_mpeg4_rl_intra, uni_mpeg4_intra_rl_bits, uni_mpeg4_intra_rl_len);
1239         init_uni_mpeg4_rl_tab(&ff_h263_rl_inter, uni_mpeg4_inter_rl_bits, uni_mpeg4_inter_rl_len);
1240     }
1241
1242     s->min_qcoeff= -2048;
1243     s->max_qcoeff=  2047;
1244     s->intra_ac_vlc_length     = uni_mpeg4_intra_rl_len;
1245     s->intra_ac_vlc_last_length= uni_mpeg4_intra_rl_len + 128*64;
1246     s->inter_ac_vlc_length     = uni_mpeg4_inter_rl_len;
1247     s->inter_ac_vlc_last_length= uni_mpeg4_inter_rl_len + 128*64;
1248     s->luma_dc_vlc_length= uni_DCtab_lum_len;
1249     s->ac_esc_length= 7+2+1+6+1+12+1;
1250     s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table;
1251     s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
1252
1253     if(s->flags & CODEC_FLAG_GLOBAL_HEADER){
1254
1255         s->avctx->extradata= av_malloc(1024);
1256         init_put_bits(&s->pb, s->avctx->extradata, 1024);
1257
1258         if(!(s->workaround_bugs & FF_BUG_MS))
1259             mpeg4_encode_visual_object_header(s);
1260         mpeg4_encode_vol_header(s, 0, 0);
1261
1262 //            ff_mpeg4_stuffing(&s->pb); ?
1263         flush_put_bits(&s->pb);
1264         s->avctx->extradata_size= (put_bits_count(&s->pb)+7)>>3;
1265     }
1266     return 0;
1267 }
1268
1269 void ff_mpeg4_init_partitions(MpegEncContext *s)
1270 {
1271     uint8_t *start= put_bits_ptr(&s->pb);
1272     uint8_t *end= s->pb.buf_end;
1273     int size= end - start;
1274     int pb_size = (((intptr_t)start + size/3)&(~3)) - (intptr_t)start;
1275     int tex_size= (size - 2*pb_size)&(~3);
1276
1277     set_put_bits_buffer_size(&s->pb, pb_size);
1278     init_put_bits(&s->tex_pb, start + pb_size           , tex_size);
1279     init_put_bits(&s->pb2   , start + pb_size + tex_size, pb_size);
1280 }
1281
1282 void ff_mpeg4_merge_partitions(MpegEncContext *s)
1283 {
1284     const int pb2_len   = put_bits_count(&s->pb2   );
1285     const int tex_pb_len= put_bits_count(&s->tex_pb);
1286     const int bits= put_bits_count(&s->pb);
1287
1288     if(s->pict_type==AV_PICTURE_TYPE_I){
1289         put_bits(&s->pb, 19, DC_MARKER);
1290         s->misc_bits+=19 + pb2_len + bits - s->last_bits;
1291         s->i_tex_bits+= tex_pb_len;
1292     }else{
1293         put_bits(&s->pb, 17, MOTION_MARKER);
1294         s->misc_bits+=17 + pb2_len;
1295         s->mv_bits+= bits - s->last_bits;
1296         s->p_tex_bits+= tex_pb_len;
1297     }
1298
1299     flush_put_bits(&s->pb2);
1300     flush_put_bits(&s->tex_pb);
1301
1302     set_put_bits_buffer_size(&s->pb, s->pb2.buf_end - s->pb.buf);
1303     avpriv_copy_bits(&s->pb, s->pb2.buf   , pb2_len);
1304     avpriv_copy_bits(&s->pb, s->tex_pb.buf, tex_pb_len);
1305     s->last_bits= put_bits_count(&s->pb);
1306 }
1307
1308
1309 void ff_mpeg4_encode_video_packet_header(MpegEncContext *s)
1310 {
1311     int mb_num_bits= av_log2(s->mb_num - 1) + 1;
1312
1313     put_bits(&s->pb, ff_mpeg4_get_video_packet_prefix_length(s), 0);
1314     put_bits(&s->pb, 1, 1);
1315
1316     put_bits(&s->pb, mb_num_bits, s->mb_x + s->mb_y*s->mb_width);
1317     put_bits(&s->pb, s->quant_precision, s->qscale);
1318     put_bits(&s->pb, 1, 0); /* no HEC */
1319 }
1320
1321 #define OFFSET(x) offsetof(MpegEncContext, x)
1322 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
1323 static const AVOption options[] = {
1324     { "data_partitioning",       "Use data partitioning.",      OFFSET(data_partitioning), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1325     { "alternate_scan",          "Enable alternate scantable.", OFFSET(alternate_scan),    AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
1326     FF_MPV_COMMON_OPTS
1327     { NULL },
1328 };
1329
1330 static const AVClass mpeg4enc_class = {
1331     .class_name = "MPEG4 encoder",
1332     .item_name  = av_default_item_name,
1333     .option     = options,
1334     .version    = LIBAVUTIL_VERSION_INT,
1335 };
1336
1337 AVCodec ff_mpeg4_encoder = {
1338     .name           = "mpeg4",
1339     .type           = AVMEDIA_TYPE_VIDEO,
1340     .id             = AV_CODEC_ID_MPEG4,
1341     .priv_data_size = sizeof(MpegEncContext),
1342     .init           = encode_init,
1343     .encode2        = ff_MPV_encode_picture,
1344     .close          = ff_MPV_encode_end,
1345     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
1346     .capabilities   = CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1347     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
1348     .priv_class     = &mpeg4enc_class,
1349 };