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/log.h"
  24 #include "libavutil/opt.h"
  25 #include "mpegvideo.h"
  26 #include "h263.h"
  27 #include "mpeg4video.h"
  28
  29 //The uni_DCtab_* tables below contain unified bits+length tables to encode DC
  30 //differences in mpeg4. Unified in the sense that the specification specifies
  31 //this encoding in several steps.
  32 static uint8_t uni_DCtab_lum_len[512];
  33 static uint8_t uni_DCtab_chrom_len[512];
  34 static uint16_t uni_DCtab_lum_bits[512];
  35 static uint16_t uni_DCtab_chrom_bits[512];
  36
  37 //unified encoding tables for run length encoding of coefficients
  38 //unified in the sense that the specification specifies the encoding in several steps.
  39 static uint32_t uni_mpeg4_intra_rl_bits[64*64*2*2];
  40 static uint8_t  uni_mpeg4_intra_rl_len [64*64*2*2];
  41 static uint32_t uni_mpeg4_inter_rl_bits[64*64*2*2];
  42 static uint8_t  uni_mpeg4_inter_rl_len [64*64*2*2];
  43 //#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128 + (run)*256 + (level))
  44 //#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run) + (level)*64)
  45 #define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run)*128 + (level))
  46
  47 /* mpeg4
  48 inter
  49 max level: 24/6
  50 max run: 53/63
  51
  52 intra
  53 max level: 53/16
  54 max run: 29/41
  55 */
  56
  57
  58 /**
  59  * Return the number of bits that encoding the 8x8 block in block would need.
  60  * @param[in]  block_last_index last index in scantable order that refers to a non zero element in block.
  61  */
  62 static inline int get_block_rate(MpegEncContext * s, DCTELEM block[64], int block_last_index, uint8_t scantable[64]){
  63     int last=0;
  64     int j;
  65     int rate=0;
  66
  67     for(j=1; j<=block_last_index; j++){
  68         const int index= scantable[j];
  69         int level= block[index];
  70         if(level){
  71             level+= 64;
  72             if((level&(~127)) == 0){
  73                 if(j<block_last_index) rate+= s->intra_ac_vlc_length     [UNI_AC_ENC_INDEX(j-last-1, level)];
  74                 else                   rate+= s->intra_ac_vlc_last_length[UNI_AC_ENC_INDEX(j-last-1, level)];
  75             }else
  76                 rate += s->ac_esc_length;
  77
  78             last= j;
  79         }
  80     }
  81
  82     return rate;
  83 }
  84
  85
  86 /**
  87  * Restore the ac coefficients in block that have been changed by decide_ac_pred().
  88  * This function also restores s->block_last_index.
  89  * @param[in,out] block MB coefficients, these will be restored
  90  * @param[in] dir ac prediction direction for each 8x8 block
  91  * @param[out] st scantable for each 8x8 block
  92  * @param[in] zigzag_last_index index refering to the last non zero coefficient in zigzag order
  93  */
  94 static inline void restore_ac_coeffs(MpegEncContext * s, DCTELEM block[6][64], const int dir[6], uint8_t *st[6], const int zigzag_last_index[6])
  95 {
  96     int i, n;
  97     memcpy(s->block_last_index, zigzag_last_index, sizeof(int)*6);
  98
  99     for(n=0; n<6; n++){
 100         int16_t *ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
 101
 102         st[n]= s->intra_scantable.permutated;
 103         if(dir[n]){
 104             /* top prediction */
 105             for(i=1; i<8; i++){
 106                 block[n][s->dsp.idct_permutation[i   ]] = ac_val[i+8];
 107             }
 108         }else{
 109             /* left prediction */
 110             for(i=1; i<8; i++){
 111                 block[n][s->dsp.idct_permutation[i<<3]]= ac_val[i  ];
 112             }
 113         }
 114     }
 115 }
 116
 117 /**
 118  * Return the optimal value (0 or 1) for the ac_pred element for the given MB in mpeg4.
 119  * This function will also update s->block_last_index and s->ac_val.
 120  * @param[in,out] block MB coefficients, these will be updated if 1 is returned
 121  * @param[in] dir ac prediction direction for each 8x8 block
 122  * @param[out] st scantable for each 8x8 block
 123  * @param[out] zigzag_last_index index refering to the last non zero coefficient in zigzag order
 124  */
 125 static inline int decide_ac_pred(MpegEncContext * s, DCTELEM block[6][64], const int dir[6], uint8_t *st[6], int zigzag_last_index[6])
 126 {
 127     int score= 0;
 128     int i, n;
 129     int8_t * const qscale_table = s->current_picture.f.qscale_table;
 130
 131     memcpy(zigzag_last_index, s->block_last_index, sizeof(int)*6);
 132
 133     for(n=0; n<6; n++){
 134         int16_t *ac_val, *ac_val1;
 135
 136         score -= get_block_rate(s, block[n], s->block_last_index[n], s->intra_scantable.permutated);
 137
 138         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
 139         ac_val1= ac_val;
 140         if(dir[n]){
 141             const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
 142             /* top prediction */
 143             ac_val-= s->block_wrap[n]*16;
 144             if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
 145                 /* same qscale */
 146                 for(i=1; i<8; i++){
 147                     const int level= block[n][s->dsp.idct_permutation[i   ]];
 148                     block[n][s->dsp.idct_permutation[i   ]] = level - ac_val[i+8];
 149                     ac_val1[i  ]=    block[n][s->dsp.idct_permutation[i<<3]];
 150                     ac_val1[i+8]= level;
 151                 }
 152             }else{
 153                 /* different qscale, we must rescale */
 154                 for(i=1; i<8; i++){
 155                     const int level= block[n][s->dsp.idct_permutation[i   ]];
 156                     block[n][s->dsp.idct_permutation[i   ]] = level - ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
 157                     ac_val1[i  ]=    block[n][s->dsp.idct_permutation[i<<3]];
 158                     ac_val1[i+8]= level;
 159                 }
 160             }
 161             st[n]= s->intra_h_scantable.permutated;
 162         }else{
 163             const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
 164             /* left prediction */
 165             ac_val-= 16;
 166             if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
 167                 /* same qscale */
 168                 for(i=1; i<8; i++){
 169                     const int level= block[n][s->dsp.idct_permutation[i<<3]];
 170                     block[n][s->dsp.idct_permutation[i<<3]]= level - ac_val[i];
 171                     ac_val1[i  ]= level;
 172                     ac_val1[i+8]=    block[n][s->dsp.idct_permutation[i   ]];
 173                 }
 174             }else{
 175                 /* different qscale, we must rescale */
 176                 for(i=1; i<8; i++){
 177                     const int level= block[n][s->dsp.idct_permutation[i<<3]];
 178                     block[n][s->dsp.idct_permutation[i<<3]]= level - ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
 179                     ac_val1[i  ]= level;
 180                     ac_val1[i+8]=    block[n][s->dsp.idct_permutation[i   ]];
 181                 }
 182             }
 183             st[n]= s->intra_v_scantable.permutated;
 184         }
 185
 186         for(i=63; i>0; i--) //FIXME optimize
 187             if(block[n][ st[n][i] ]) break;
 188         s->block_last_index[n]= i;
 189
 190         score += get_block_rate(s, block[n], s->block_last_index[n], st[n]);
 191     }
 192
 193     if(score < 0){
 194         return 1;
 195     }else{
 196         restore_ac_coeffs(s, block, dir, st, zigzag_last_index);
 197         return 0;
 198     }
 199 }
 200
 201 /**
 202  * modify mb_type & qscale so that encoding is acually possible in mpeg4
 203  */
 204 void ff_clean_mpeg4_qscales(MpegEncContext *s){
 205     int i;
 206     int8_t * const qscale_table = s->current_picture.f.qscale_table;
 207
 208     ff_clean_h263_qscales(s);
 209
 210     if(s->pict_type== AV_PICTURE_TYPE_B){
 211         int odd=0;
 212         /* ok, come on, this isn't funny anymore, there's more code for handling this mpeg4 mess than for the actual adaptive quantization */
 213
 214         for(i=0; i<s->mb_num; i++){
 215             int mb_xy= s->mb_index2xy[i];
 216             odd += qscale_table[mb_xy]&1;
 217         }
 218
 219         if(2*odd > s->mb_num) odd=1;
 220         else                  odd=0;
 221
 222         for(i=0; i<s->mb_num; i++){
 223             int mb_xy= s->mb_index2xy[i];
 224             if((qscale_table[mb_xy]&1) != odd)
 225                 qscale_table[mb_xy]++;
 226             if(qscale_table[mb_xy] > 31)
 227                 qscale_table[mb_xy]= 31;
 228         }
 229
 230         for(i=1; i<s->mb_num; i++){
 231             int mb_xy= s->mb_index2xy[i];
 232             if(qscale_table[mb_xy] != qscale_table[s->mb_index2xy[i-1]] && (s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_DIRECT)){
 233                 s->mb_type[mb_xy]|= CANDIDATE_MB_TYPE_BIDIR;
 234             }
 235         }
 236     }
 237 }
 238
 239
 240 /**
 241  * Encode the dc value.
 242  * @param n block index (0-3 are luma, 4-5 are chroma)
 243  */
 244 static inline void mpeg4_encode_dc(PutBitContext * s, int level, int n)
 245 {
 246 #if 1
 247     /* DC will overflow if level is outside the [-255,255] range. */
 248     level+=256;
 249     if (n < 4) {
 250         /* luminance */
 251         put_bits(s, uni_DCtab_lum_len[level], uni_DCtab_lum_bits[level]);
 252     } else {
 253         /* chrominance */
 254         put_bits(s, uni_DCtab_chrom_len[level], uni_DCtab_chrom_bits[level]);
 255     }
 256 #else
 257     int size, v;
 258     /* find number of bits */
 259     size = 0;
 260     v = abs(level);
 261     while (v) {
 262         v >>= 1;
 263         size++;
 264     }
 265
 266     if (n < 4) {
 267         /* luminance */
 268         put_bits(&s->pb, ff_mpeg4_DCtab_lum[size][1], ff_mpeg4_DCtab_lum[size][0]);
 269     } else {
 270         /* chrominance */
 271         put_bits(&s->pb, ff_mpeg4_DCtab_chrom[size][1], ff_mpeg4_DCtab_chrom[size][0]);
 272     }
 273
 274     /* encode remaining bits */
 275     if (size > 0) {
 276         if (level < 0)
 277             level = (-level) ^ ((1 << size) - 1);
 278         put_bits(&s->pb, size, level);
 279         if (size > 8)
 280             put_bits(&s->pb, 1, 1);
 281     }
 282 #endif
 283 }
 284
 285 static inline int mpeg4_get_dc_length(int level, int n){
 286     if (n < 4) {
 287         return uni_DCtab_lum_len[level + 256];
 288     } else {
 289         return uni_DCtab_chrom_len[level + 256];
 290     }
 291 }
 292
 293 /**
 294  * Encode an 8x8 block.
 295  * @param n block index (0-3 are luma, 4-5 are chroma)
 296  */
 297 static inline void mpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n, int intra_dc,
 298                                uint8_t *scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb)
 299 {
 300     int i, last_non_zero;
 301     uint32_t *bits_tab;
 302     uint8_t *len_tab;
 303     const int last_index = s->block_last_index[n];
 304
 305     if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
 306         /* mpeg4 based DC predictor */
 307         mpeg4_encode_dc(dc_pb, intra_dc, n);
 308         if(last_index<1) return;
 309         i = 1;
 310         bits_tab= uni_mpeg4_intra_rl_bits;
 311         len_tab = uni_mpeg4_intra_rl_len;
 312     } else {
 313         if(last_index<0) return;
 314         i = 0;
 315         bits_tab= uni_mpeg4_inter_rl_bits;
 316         len_tab = uni_mpeg4_inter_rl_len;
 317     }
 318
 319     /* AC coefs */
 320     last_non_zero = i - 1;
 321     for (; i < last_index; i++) {
 322         int level = block[ scan_table[i] ];
 323         if (level) {
 324             int run = i - last_non_zero - 1;
 325             level+=64;
 326             if((level&(~127)) == 0){
 327                 const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
 328                 put_bits(ac_pb, len_tab[index], bits_tab[index]);
 329             }else{ //ESC3
 330                 put_bits(ac_pb, 7+2+1+6+1+12+1, (3<<23)+(3<<21)+(0<<20)+(run<<14)+(1<<13)+(((level-64)&0xfff)<<1)+1);
 331             }
 332             last_non_zero = i;
 333         }
 334     }
 335     /*if(i<=last_index)*/{
 336         int level = block[ scan_table[i] ];
 337         int run = i - last_non_zero - 1;
 338         level+=64;
 339         if((level&(~127)) == 0){
 340             const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
 341             put_bits(ac_pb, len_tab[index], bits_tab[index]);
 342         }else{ //ESC3
 343             put_bits(ac_pb, 7+2+1+6+1+12+1, (3<<23)+(3<<21)+(1<<20)+(run<<14)+(1<<13)+(((level-64)&0xfff)<<1)+1);
 344         }
 345     }
 346 }
 347
 348 static int mpeg4_get_block_length(MpegEncContext * s, DCTELEM * block, int n, int intra_dc,
 349                                uint8_t *scan_table)
 350 {
 351     int i, last_non_zero;
 352     uint8_t *len_tab;
 353     const int last_index = s->block_last_index[n];
 354     int len=0;
 355
 356     if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
 357         /* mpeg4 based DC predictor */
 358         len += mpeg4_get_dc_length(intra_dc, n);
 359         if(last_index<1) return len;
 360         i = 1;
 361         len_tab = uni_mpeg4_intra_rl_len;
 362     } else {
 363         if(last_index<0) return 0;
 364         i = 0;
 365         len_tab = uni_mpeg4_inter_rl_len;
 366     }
 367
 368     /* AC coefs */
 369     last_non_zero = i - 1;
 370     for (; i < last_index; i++) {
 371         int level = block[ scan_table[i] ];
 372         if (level) {
 373             int run = i - last_non_zero - 1;
 374             level+=64;
 375             if((level&(~127)) == 0){
 376                 const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
 377                 len += len_tab[index];
 378             }else{ //ESC3
 379                 len += 7+2+1+6+1+12+1;
 380             }
 381             last_non_zero = i;
 382         }
 383     }
 384     /*if(i<=last_index)*/{
 385         int level = block[ scan_table[i] ];
 386         int run = i - last_non_zero - 1;
 387         level+=64;
 388         if((level&(~127)) == 0){
 389             const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
 390             len += len_tab[index];
 391         }else{ //ESC3
 392             len += 7+2+1+6+1+12+1;
 393         }
 394     }
 395
 396     return len;
 397 }
 398
 399 static inline void mpeg4_encode_blocks(MpegEncContext * s, DCTELEM block[6][64], int intra_dc[6],
 400                                uint8_t **scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb){
 401     int i;
 402
 403     if(scan_table){
 404         if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
 405             for (i = 0; i < 6; i++) {
 406                 skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, intra_dc[i], scan_table[i]));
 407             }
 408         }else{
 409             /* encode each block */
 410             for (i = 0; i < 6; i++) {
 411                 mpeg4_encode_block(s, block[i], i, intra_dc[i], scan_table[i], dc_pb, ac_pb);
 412             }
 413         }
 414     }else{
 415         if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
 416             for (i = 0; i < 6; i++) {
 417                 skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, 0, s->intra_scantable.permutated));
 418             }
 419         }else{
 420             /* encode each block */
 421             for (i = 0; i < 6; i++) {
 422                 mpeg4_encode_block(s, block[i], i, 0, s->intra_scantable.permutated, dc_pb, ac_pb);
 423             }
 424         }
 425     }
 426 }
 427
 428 static inline int get_b_cbp(MpegEncContext * s, DCTELEM block[6][64],
 429                             int motion_x, int motion_y, int mb_type)
 430 {
 431     int cbp = 0, i;
 432
 433     if (s->flags & CODEC_FLAG_CBP_RD) {
 434         int score = 0;
 435         const int lambda = s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
 436
 437         for (i = 0; i < 6; i++)
 438             if (s->coded_score[i] < 0) {
 439                 score += s->coded_score[i];
 440                 cbp   |= 1 << (5 - i);
 441             }
 442
 443         if (cbp) {
 444             int zero_score = -6;
 445             if ((motion_x | motion_y | s->dquant | mb_type) == 0)
 446                 zero_score -= 4; //2*MV + mb_type + cbp bit
 447
 448             zero_score *= lambda;
 449             if (zero_score <= score)
 450                 cbp = 0;
 451         }
 452
 453         for (i = 0; i < 6; i++) {
 454             if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i)) & 1) == 0) {
 455                 s->block_last_index[i] = -1;
 456                 s->dsp.clear_block(s->block[i]);
 457             }
 458         }
 459     } else {
 460         for (i = 0; i < 6; i++) {
 461             if (s->block_last_index[i] >= 0)
 462                 cbp |= 1 << (5 - i);
 463         }
 464     }
 465     return cbp;
 466 }
 467
 468 //FIXME this is duplicated to h263.c
 469 static const int dquant_code[5]= {1,0,9,2,3};
 470
 471 void ff_mpeg4_encode_mb(MpegEncContext * s,
 472                         DCTELEM block[6][64],
 473                         int motion_x, int motion_y)
 474 {
 475     int cbpc, cbpy, pred_x, pred_y;
 476     PutBitContext * const pb2    = s->data_partitioning                         ? &s->pb2    : &s->pb;
 477     PutBitContext * const tex_pb = s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B ? &s->tex_pb : &s->pb;
 478     PutBitContext * const dc_pb  = s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_I ? &s->pb2    : &s->pb;
 479     const int interleaved_stats= (s->flags&CODEC_FLAG_PASS1) && !s->data_partitioning ? 1 : 0;
 480
 481     if (!s->mb_intra) {
 482         int i, cbp;
 483
 484         if(s->pict_type==AV_PICTURE_TYPE_B){
 485             static const int mb_type_table[8]= {-1, 3, 2, 1,-1,-1,-1, 0}; /* convert from mv_dir to type */
 486             int mb_type=  mb_type_table[s->mv_dir];
 487
 488             if(s->mb_x==0){
 489                 for(i=0; i<2; i++){
 490                     s->last_mv[i][0][0]=
 491                     s->last_mv[i][0][1]=
 492                     s->last_mv[i][1][0]=
 493                     s->last_mv[i][1][1]= 0;
 494                 }
 495             }
 496
 497             assert(s->dquant>=-2 && s->dquant<=2);
 498             assert((s->dquant&1)==0);
 499             assert(mb_type>=0);
 500
 501             /* nothing to do if this MB was skipped in the next P Frame */
 502             if (s->next_picture.f.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]) { //FIXME avoid DCT & ...
 503                 s->skip_count++;
 504                 s->mv[0][0][0]=
 505                 s->mv[0][0][1]=
 506                 s->mv[1][0][0]=
 507                 s->mv[1][0][1]= 0;
 508                 s->mv_dir= MV_DIR_FORWARD; //doesn't matter
 509                 s->qscale -= s->dquant;
 510 //                s->mb_skipped=1;
 511
 512                 return;
 513             }
 514
 515             cbp= get_b_cbp(s, block, motion_x, motion_y, mb_type);
 516
 517             if ((cbp | motion_x | motion_y | mb_type) ==0) {
 518                 /* direct MB with MV={0,0} */
 519                 assert(s->dquant==0);
 520
 521                 put_bits(&s->pb, 1, 1); /* mb not coded modb1=1 */
 522
 523                 if(interleaved_stats){
 524                     s->misc_bits++;
 525                     s->last_bits++;
 526                 }
 527                 s->skip_count++;
 528                 return;
 529             }
 530
 531             put_bits(&s->pb, 1, 0);     /* mb coded modb1=0 */
 532             put_bits(&s->pb, 1, cbp ? 0 : 1); /* modb2 */ //FIXME merge
 533             put_bits(&s->pb, mb_type+1, 1); // this table is so simple that we don't need it :)
 534             if(cbp) put_bits(&s->pb, 6, cbp);
 535
 536             if(cbp && mb_type){
 537                 if(s->dquant)
 538                     put_bits(&s->pb, 2, (s->dquant>>2)+3);
 539                 else
 540                     put_bits(&s->pb, 1, 0);
 541             }else
 542                 s->qscale -= s->dquant;
 543
 544             if(!s->progressive_sequence){
 545                 if(cbp)
 546                     put_bits(&s->pb, 1, s->interlaced_dct);
 547                 if(mb_type) // not direct mode
 548                     put_bits(&s->pb, 1, s->mv_type == MV_TYPE_FIELD);
 549             }
 550
 551             if(interleaved_stats){
 552                 s->misc_bits+= get_bits_diff(s);
 553             }
 554
 555             if(mb_type == 0){
 556                 assert(s->mv_dir & MV_DIRECT);
 557                 ff_h263_encode_motion_vector(s, motion_x, motion_y, 1);
 558                 s->b_count++;
 559                 s->f_count++;
 560             }else{
 561                 assert(mb_type > 0 && mb_type < 4);
 562                 if(s->mv_type != MV_TYPE_FIELD){
 563                     if(s->mv_dir & MV_DIR_FORWARD){
 564                         ff_h263_encode_motion_vector(s, s->mv[0][0][0] - s->last_mv[0][0][0],
 565                                                         s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 566                         s->last_mv[0][0][0]= s->last_mv[0][1][0]= s->mv[0][0][0];
 567                         s->last_mv[0][0][1]= s->last_mv[0][1][1]= s->mv[0][0][1];
 568                         s->f_count++;
 569                     }
 570                     if(s->mv_dir & MV_DIR_BACKWARD){
 571                         ff_h263_encode_motion_vector(s, s->mv[1][0][0] - s->last_mv[1][0][0],
 572                                                         s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 573                         s->last_mv[1][0][0]= s->last_mv[1][1][0]= s->mv[1][0][0];
 574                         s->last_mv[1][0][1]= s->last_mv[1][1][1]= s->mv[1][0][1];
 575                         s->b_count++;
 576                     }
 577                 }else{
 578                     if(s->mv_dir & MV_DIR_FORWARD){
 579                         put_bits(&s->pb, 1, s->field_select[0][0]);
 580                         put_bits(&s->pb, 1, s->field_select[0][1]);
 581                     }
 582                     if(s->mv_dir & MV_DIR_BACKWARD){
 583                         put_bits(&s->pb, 1, s->field_select[1][0]);
 584                         put_bits(&s->pb, 1, s->field_select[1][1]);
 585                     }
 586                     if(s->mv_dir & MV_DIR_FORWARD){
 587                         for(i=0; i<2; i++){
 588                             ff_h263_encode_motion_vector(s, s->mv[0][i][0] - s->last_mv[0][i][0]  ,
 589                                                             s->mv[0][i][1] - s->last_mv[0][i][1]/2, s->f_code);
 590                             s->last_mv[0][i][0]= s->mv[0][i][0];
 591                             s->last_mv[0][i][1]= s->mv[0][i][1]*2;
 592                         }
 593                         s->f_count++;
 594                     }
 595                     if(s->mv_dir & MV_DIR_BACKWARD){
 596                         for(i=0; i<2; i++){
 597                             ff_h263_encode_motion_vector(s, s->mv[1][i][0] - s->last_mv[1][i][0]  ,
 598                                                             s->mv[1][i][1] - s->last_mv[1][i][1]/2, s->b_code);
 599                             s->last_mv[1][i][0]= s->mv[1][i][0];
 600                             s->last_mv[1][i][1]= s->mv[1][i][1]*2;
 601                         }
 602                         s->b_count++;
 603                     }
 604                 }
 605             }
 606
 607             if(interleaved_stats){
 608                 s->mv_bits+= get_bits_diff(s);
 609             }
 610
 611             mpeg4_encode_blocks(s, block, NULL, NULL, NULL, &s->pb);
 612
 613             if(interleaved_stats){
 614                 s->p_tex_bits+= get_bits_diff(s);
 615             }
 616
 617         }else{ /* s->pict_type==AV_PICTURE_TYPE_B */
 618             cbp= get_p_cbp(s, block, motion_x, motion_y);
 619
 620             if ((cbp | motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16) {
 621                 /* check if the B frames can skip it too, as we must skip it if we skip here
 622                    why didn't they just compress the skip-mb bits instead of reusing them ?! */
 623                 if(s->max_b_frames>0){
 624                     int i;
 625                     int x,y, offset;
 626                     uint8_t *p_pic;
 627
 628                     x= s->mb_x*16;
 629                     y= s->mb_y*16;
 630                     if(x+16 > s->width)  x= s->width-16;
 631                     if(y+16 > s->height) y= s->height-16;
 632
 633                     offset= x + y*s->linesize;
 634                     p_pic = s->new_picture.f.data[0] + offset;
 635
 636                     s->mb_skipped=1;
 637                     for(i=0; i<s->max_b_frames; i++){
 638                         uint8_t *b_pic;
 639                         int diff;
 640                         Picture *pic= s->reordered_input_picture[i+1];
 641
 642                         if (pic == NULL || pic->f.pict_type != AV_PICTURE_TYPE_B)
 643                             break;
 644
 645                         b_pic = pic->f.data[0] + offset;
 646                         if (pic->f.type != FF_BUFFER_TYPE_SHARED)
 647                             b_pic+= INPLACE_OFFSET;
 648                         diff= s->dsp.sad[0](NULL, p_pic, b_pic, s->linesize, 16);
 649                         if(diff>s->qscale*70){ //FIXME check that 70 is optimal
 650                             s->mb_skipped=0;
 651                             break;
 652                         }
 653                     }
 654                 }else
 655                     s->mb_skipped=1;
 656
 657                 if(s->mb_skipped==1){
 658                     /* skip macroblock */
 659                     put_bits(&s->pb, 1, 1);
 660
 661                     if(interleaved_stats){
 662                         s->misc_bits++;
 663                         s->last_bits++;
 664                     }
 665                     s->skip_count++;
 666
 667                     return;
 668                 }
 669             }
 670
 671             put_bits(&s->pb, 1, 0);     /* mb coded */
 672             cbpc = cbp & 3;
 673             cbpy = cbp >> 2;
 674             cbpy ^= 0xf;
 675             if(s->mv_type==MV_TYPE_16X16){
 676                 if(s->dquant) cbpc+= 8;
 677                 put_bits(&s->pb,
 678                         ff_h263_inter_MCBPC_bits[cbpc],
 679                         ff_h263_inter_MCBPC_code[cbpc]);
 680
 681                 put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
 682                 if(s->dquant)
 683                     put_bits(pb2, 2, dquant_code[s->dquant+2]);
 684
 685                 if(!s->progressive_sequence){
 686                     if(cbp)
 687                         put_bits(pb2, 1, s->interlaced_dct);
 688                     put_bits(pb2, 1, 0);
 689                 }
 690
 691                 if(interleaved_stats){
 692                     s->misc_bits+= get_bits_diff(s);
 693                 }
 694
 695                 /* motion vectors: 16x16 mode */
 696                 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
 697
 698                 ff_h263_encode_motion_vector(s, motion_x - pred_x,
 699                                                 motion_y - pred_y, s->f_code);
 700             }else if(s->mv_type==MV_TYPE_FIELD){
 701                 if(s->dquant) cbpc+= 8;
 702                 put_bits(&s->pb,
 703                         ff_h263_inter_MCBPC_bits[cbpc],
 704                         ff_h263_inter_MCBPC_code[cbpc]);
 705
 706                 put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
 707                 if(s->dquant)
 708                     put_bits(pb2, 2, dquant_code[s->dquant+2]);
 709
 710                 assert(!s->progressive_sequence);
 711                 if(cbp)
 712                     put_bits(pb2, 1, s->interlaced_dct);
 713                 put_bits(pb2, 1, 1);
 714
 715                 if(interleaved_stats){
 716                     s->misc_bits+= get_bits_diff(s);
 717                 }
 718
 719                 /* motion vectors: 16x8 interlaced mode */
 720                 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
 721                 pred_y /=2;
 722
 723                 put_bits(&s->pb, 1, s->field_select[0][0]);
 724                 put_bits(&s->pb, 1, s->field_select[0][1]);
 725
 726                 ff_h263_encode_motion_vector(s, s->mv[0][0][0] - pred_x,
 727                                                 s->mv[0][0][1] - pred_y, s->f_code);
 728                 ff_h263_encode_motion_vector(s, s->mv[0][1][0] - pred_x,
 729                                                 s->mv[0][1][1] - pred_y, s->f_code);
 730             }else{
 731                 assert(s->mv_type==MV_TYPE_8X8);
 732                 put_bits(&s->pb,
 733                         ff_h263_inter_MCBPC_bits[cbpc+16],
 734                         ff_h263_inter_MCBPC_code[cbpc+16]);
 735                 put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
 736
 737                 if(!s->progressive_sequence){
 738                     if(cbp)
 739                         put_bits(pb2, 1, s->interlaced_dct);
 740                 }
 741
 742                 if(interleaved_stats){
 743                     s->misc_bits+= get_bits_diff(s);
 744                 }
 745
 746                 for(i=0; i<4; i++){
 747                     /* motion vectors: 8x8 mode*/
 748                     ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
 749
 750                     ff_h263_encode_motion_vector(s, s->current_picture.f.motion_val[0][ s->block_index[i] ][0] - pred_x,
 751                                                     s->current_picture.f.motion_val[0][ s->block_index[i] ][1] - pred_y, s->f_code);
 752                 }
 753             }
 754
 755             if(interleaved_stats){
 756                 s->mv_bits+= get_bits_diff(s);
 757             }
 758
 759             mpeg4_encode_blocks(s, block, NULL, NULL, NULL, tex_pb);
 760
 761             if(interleaved_stats){
 762                 s->p_tex_bits+= get_bits_diff(s);
 763             }
 764             s->f_count++;
 765         }
 766     } else {
 767         int cbp;
 768         int dc_diff[6];   //dc values with the dc prediction subtracted
 769         int dir[6];  //prediction direction
 770         int zigzag_last_index[6];
 771         uint8_t *scan_table[6];
 772         int i;
 773
 774         for(i=0; i<6; i++){
 775             dc_diff[i]= ff_mpeg4_pred_dc(s, i, block[i][0], &dir[i], 1);
 776         }
 777
 778         if(s->flags & CODEC_FLAG_AC_PRED){
 779             s->ac_pred= decide_ac_pred(s, block, dir, scan_table, zigzag_last_index);
 780         }else{
 781             for(i=0; i<6; i++)
 782                 scan_table[i]= s->intra_scantable.permutated;
 783         }
 784
 785         /* compute cbp */
 786         cbp = 0;
 787         for (i = 0; i < 6; i++) {
 788             if (s->block_last_index[i] >= 1)
 789                 cbp |= 1 << (5 - i);
 790         }
 791
 792         cbpc = cbp & 3;
 793         if (s->pict_type == AV_PICTURE_TYPE_I) {
 794             if(s->dquant) cbpc+=4;
 795             put_bits(&s->pb,
 796                 ff_h263_intra_MCBPC_bits[cbpc],
 797                 ff_h263_intra_MCBPC_code[cbpc]);
 798         } else {
 799             if(s->dquant) cbpc+=8;
 800             put_bits(&s->pb, 1, 0);     /* mb coded */
 801             put_bits(&s->pb,
 802                 ff_h263_inter_MCBPC_bits[cbpc + 4],
 803                 ff_h263_inter_MCBPC_code[cbpc + 4]);
 804         }
 805         put_bits(pb2, 1, s->ac_pred);
 806         cbpy = cbp >> 2;
 807         put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
 808         if(s->dquant)
 809             put_bits(dc_pb, 2, dquant_code[s->dquant+2]);
 810
 811         if(!s->progressive_sequence){
 812             put_bits(dc_pb, 1, s->interlaced_dct);
 813         }
 814
 815         if(interleaved_stats){
 816             s->misc_bits+= get_bits_diff(s);
 817         }
 818
 819         mpeg4_encode_blocks(s, block, dc_diff, scan_table, dc_pb, tex_pb);
 820
 821         if(interleaved_stats){
 822             s->i_tex_bits+= get_bits_diff(s);
 823         }
 824         s->i_count++;
 825
 826         /* restore ac coeffs & last_index stuff if we messed them up with the prediction */
 827         if(s->ac_pred)
 828             restore_ac_coeffs(s, block, dir, scan_table, zigzag_last_index);
 829     }
 830 }
 831
 832 /**
 833  * add mpeg4 stuffing bits (01...1)
 834  */
 835 void ff_mpeg4_stuffing(PutBitContext * pbc)
 836 {
 837     int length;
 838     put_bits(pbc, 1, 0);
 839     length= (-put_bits_count(pbc))&7;
 840     if(length) put_bits(pbc, length, (1<<length)-1);
 841 }
 842
 843 /* must be called before writing the header */
 844 void ff_set_mpeg4_time(MpegEncContext * s){
 845     if(s->pict_type==AV_PICTURE_TYPE_B){
 846         ff_mpeg4_init_direct_mv(s);
 847     }else{
 848         s->last_time_base= s->time_base;
 849         s->time_base= s->time/s->avctx->time_base.den;
 850     }
 851 }
 852
 853 static void mpeg4_encode_gop_header(MpegEncContext * s){
 854     int hours, minutes, seconds;
 855     int64_t time;
 856
 857     put_bits(&s->pb, 16, 0);
 858     put_bits(&s->pb, 16, GOP_STARTCODE);
 859
 860     time = s->current_picture_ptr->f.pts;
 861     if(s->reordered_input_picture[1])
 862         time = FFMIN(time, s->reordered_input_picture[1]->f.pts);
 863     time= time*s->avctx->time_base.num;
 864
 865     seconds= time/s->avctx->time_base.den;
 866     minutes= seconds/60; seconds %= 60;
 867     hours= minutes/60; minutes %= 60;
 868     hours%=24;
 869
 870     put_bits(&s->pb, 5, hours);
 871     put_bits(&s->pb, 6, minutes);
 872     put_bits(&s->pb, 1, 1);
 873     put_bits(&s->pb, 6, seconds);
 874
 875     put_bits(&s->pb, 1, !!(s->flags&CODEC_FLAG_CLOSED_GOP));
 876     put_bits(&s->pb, 1, 0); //broken link == NO
 877
 878     s->last_time_base= time / s->avctx->time_base.den;
 879
 880     ff_mpeg4_stuffing(&s->pb);
 881 }
 882
 883 static void mpeg4_encode_visual_object_header(MpegEncContext * s){
 884     int profile_and_level_indication;
 885     int vo_ver_id;
 886
 887     if(s->avctx->profile != FF_PROFILE_UNKNOWN){
 888         profile_and_level_indication = s->avctx->profile << 4;
 889     }else if(s->max_b_frames || s->quarter_sample){
 890         profile_and_level_indication= 0xF0; // adv simple
 891     }else{
 892         profile_and_level_indication= 0x00; // simple
 893     }
 894
 895     if(s->avctx->level != FF_LEVEL_UNKNOWN){
 896         profile_and_level_indication |= s->avctx->level;
 897     }else{
 898         profile_and_level_indication |= 1; //level 1
 899     }
 900
 901     if(profile_and_level_indication>>4 == 0xF){
 902         vo_ver_id= 5;
 903     }else{
 904         vo_ver_id= 1;
 905     }
 906
 907     //FIXME levels
 908
 909     put_bits(&s->pb, 16, 0);
 910     put_bits(&s->pb, 16, VOS_STARTCODE);
 911
 912     put_bits(&s->pb, 8, profile_and_level_indication);
 913
 914     put_bits(&s->pb, 16, 0);
 915     put_bits(&s->pb, 16, VISUAL_OBJ_STARTCODE);
 916
 917     put_bits(&s->pb, 1, 1);
 918         put_bits(&s->pb, 4, vo_ver_id);
 919         put_bits(&s->pb, 3, 1); //priority
 920
 921     put_bits(&s->pb, 4, 1); //visual obj type== video obj
 922
 923     put_bits(&s->pb, 1, 0); //video signal type == no clue //FIXME
 924
 925     ff_mpeg4_stuffing(&s->pb);
 926 }
 927
 928 static void mpeg4_encode_vol_header(MpegEncContext * s, int vo_number, int vol_number)
 929 {
 930     int vo_ver_id;
 931
 932     if (!CONFIG_MPEG4_ENCODER)  return;
 933
 934     if(s->max_b_frames || s->quarter_sample){
 935         vo_ver_id= 5;
 936         s->vo_type= ADV_SIMPLE_VO_TYPE;
 937     }else{
 938         vo_ver_id= 1;
 939         s->vo_type= SIMPLE_VO_TYPE;
 940     }
 941
 942     put_bits(&s->pb, 16, 0);
 943     put_bits(&s->pb, 16, 0x100 + vo_number);        /* video obj */
 944     put_bits(&s->pb, 16, 0);
 945     put_bits(&s->pb, 16, 0x120 + vol_number);       /* video obj layer */
 946
 947     put_bits(&s->pb, 1, 0);             /* random access vol */
 948     put_bits(&s->pb, 8, s->vo_type);    /* video obj type indication */
 949     if(s->workaround_bugs & FF_BUG_MS) {
 950         put_bits(&s->pb, 1, 0);         /* is obj layer id= no */
 951     } else {
 952         put_bits(&s->pb, 1, 1);         /* is obj layer id= yes */
 953         put_bits(&s->pb, 4, vo_ver_id); /* is obj layer ver id */
 954         put_bits(&s->pb, 3, 1);         /* is obj layer priority */
 955     }
 956
 957     s->aspect_ratio_info= ff_h263_aspect_to_info(s->avctx->sample_aspect_ratio);
 958
 959     put_bits(&s->pb, 4, s->aspect_ratio_info);/* aspect ratio info */
 960     if (s->aspect_ratio_info == FF_ASPECT_EXTENDED){
 961         put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.num);
 962         put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.den);
 963     }
 964
 965     if(s->workaround_bugs & FF_BUG_MS) { //
 966         put_bits(&s->pb, 1, 0);         /* vol control parameters= no @@@ */
 967     } else {
 968         put_bits(&s->pb, 1, 1);         /* vol control parameters= yes */
 969         put_bits(&s->pb, 2, 1);         /* chroma format YUV 420/YV12 */
 970         put_bits(&s->pb, 1, s->low_delay);
 971         put_bits(&s->pb, 1, 0);         /* vbv parameters= no */
 972     }
 973
 974     put_bits(&s->pb, 2, RECT_SHAPE);    /* vol shape= rectangle */
 975     put_bits(&s->pb, 1, 1);             /* marker bit */
 976
 977     put_bits(&s->pb, 16, s->avctx->time_base.den);
 978     if (s->time_increment_bits < 1)
 979         s->time_increment_bits = 1;
 980     put_bits(&s->pb, 1, 1);             /* marker bit */
 981     put_bits(&s->pb, 1, 0);             /* fixed vop rate=no */
 982     put_bits(&s->pb, 1, 1);             /* marker bit */
 983     put_bits(&s->pb, 13, s->width);     /* vol width */
 984     put_bits(&s->pb, 1, 1);             /* marker bit */
 985     put_bits(&s->pb, 13, s->height);    /* vol height */
 986     put_bits(&s->pb, 1, 1);             /* marker bit */
 987     put_bits(&s->pb, 1, s->progressive_sequence ? 0 : 1);
 988     put_bits(&s->pb, 1, 1);             /* obmc disable */
 989     if (vo_ver_id == 1) {
 990         put_bits(&s->pb, 1, s->vol_sprite_usage);       /* sprite enable */
 991     }else{
 992         put_bits(&s->pb, 2, s->vol_sprite_usage);       /* sprite enable */
 993     }
 994
 995     put_bits(&s->pb, 1, 0);             /* not 8 bit == false */
 996     put_bits(&s->pb, 1, s->mpeg_quant); /* quant type= (0=h263 style)*/
 997
 998     if(s->mpeg_quant){
 999         ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
1000         ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
1001     }
1002
1003     if (vo_ver_id != 1)
1004         put_bits(&s->pb, 1, s->quarter_sample);
1005     put_bits(&s->pb, 1, 1);             /* complexity estimation disable */
1006     s->resync_marker= s->rtp_mode;
1007     put_bits(&s->pb, 1, s->resync_marker ? 0 : 1);/* resync marker disable */
1008     put_bits(&s->pb, 1, s->data_partitioning ? 1 : 0);
1009     if(s->data_partitioning){
1010         put_bits(&s->pb, 1, 0);         /* no rvlc */
1011     }
1012
1013     if (vo_ver_id != 1){
1014         put_bits(&s->pb, 1, 0);         /* newpred */
1015         put_bits(&s->pb, 1, 0);         /* reduced res vop */
1016     }
1017     put_bits(&s->pb, 1, 0);             /* scalability */
1018
1019     ff_mpeg4_stuffing(&s->pb);
1020
1021     /* user data */
1022     if(!(s->flags & CODEC_FLAG_BITEXACT)){
1023         put_bits(&s->pb, 16, 0);
1024         put_bits(&s->pb, 16, 0x1B2);    /* user_data */
1025         ff_put_string(&s->pb, LIBAVCODEC_IDENT, 0);
1026     }
1027 }
1028
1029 /* write mpeg4 VOP header */
1030 void ff_mpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
1031 {
1032     int time_incr;
1033     int time_div, time_mod;
1034
1035     if(s->pict_type==AV_PICTURE_TYPE_I){
1036         if(!(s->flags&CODEC_FLAG_GLOBAL_HEADER)){
1037             if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT) //HACK, the reference sw is buggy
1038                 mpeg4_encode_visual_object_header(s);
1039             if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT || picture_number==0) //HACK, the reference sw is buggy
1040                 mpeg4_encode_vol_header(s, 0, 0);
1041         }
1042         if(!(s->workaround_bugs & FF_BUG_MS))
1043             mpeg4_encode_gop_header(s);
1044     }
1045
1046     s->partitioned_frame= s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B;
1047
1048     put_bits(&s->pb, 16, 0);                /* vop header */
1049     put_bits(&s->pb, 16, VOP_STARTCODE);    /* vop header */
1050     put_bits(&s->pb, 2, s->pict_type - 1);  /* pict type: I = 0 , P = 1 */
1051
1052     assert(s->time>=0);
1053     time_div= s->time/s->avctx->time_base.den;
1054     time_mod= s->time%s->avctx->time_base.den;
1055     time_incr= time_div - s->last_time_base;
1056     assert(time_incr >= 0);
1057     while(time_incr--)
1058         put_bits(&s->pb, 1, 1);
1059
1060     put_bits(&s->pb, 1, 0);
1061
1062     put_bits(&s->pb, 1, 1);                             /* marker */
1063     put_bits(&s->pb, s->time_increment_bits, time_mod); /* time increment */
1064     put_bits(&s->pb, 1, 1);                             /* marker */
1065     put_bits(&s->pb, 1, 1);                             /* vop coded */
1066     if (    s->pict_type == AV_PICTURE_TYPE_P
1067         || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE)) {
1068         put_bits(&s->pb, 1, s->no_rounding);    /* rounding type */
1069     }
1070     put_bits(&s->pb, 3, 0);     /* intra dc VLC threshold */
1071     if(!s->progressive_sequence){
1072          put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
1073          put_bits(&s->pb, 1, s->alternate_scan);
1074     }
1075     //FIXME sprite stuff
1076
1077     put_bits(&s->pb, 5, s->qscale);
1078
1079     if (s->pict_type != AV_PICTURE_TYPE_I)
1080         put_bits(&s->pb, 3, s->f_code); /* fcode_for */
1081     if (s->pict_type == AV_PICTURE_TYPE_B)
1082         put_bits(&s->pb, 3, s->b_code); /* fcode_back */
1083 }
1084
1085
1086 static void init_uni_dc_tab(void)
1087 {
1088     int level, uni_code, uni_len;
1089
1090     for(level=-256; level<256; level++){
1091         int size, v, l;
1092         /* find number of bits */
1093         size = 0;
1094         v = abs(level);
1095         while (v) {
1096             v >>= 1;
1097             size++;
1098         }
1099
1100         if (level < 0)
1101             l= (-level) ^ ((1 << size) - 1);
1102         else
1103             l= level;
1104
1105         /* luminance */
1106         uni_code= ff_mpeg4_DCtab_lum[size][0];
1107         uni_len = ff_mpeg4_DCtab_lum[size][1];
1108
1109         if (size > 0) {
1110             uni_code<<=size; uni_code|=l;
1111             uni_len+=size;
1112             if (size > 8){
1113                 uni_code<<=1; uni_code|=1;
1114                 uni_len++;
1115             }
1116         }
1117         uni_DCtab_lum_bits[level+256]= uni_code;
1118         uni_DCtab_lum_len [level+256]= uni_len;
1119
1120         /* chrominance */
1121         uni_code= ff_mpeg4_DCtab_chrom[size][0];
1122         uni_len = ff_mpeg4_DCtab_chrom[size][1];
1123
1124         if (size > 0) {
1125             uni_code<<=size; uni_code|=l;
1126             uni_len+=size;
1127             if (size > 8){
1128                 uni_code<<=1; uni_code|=1;
1129                 uni_len++;
1130             }
1131         }
1132         uni_DCtab_chrom_bits[level+256]= uni_code;
1133         uni_DCtab_chrom_len [level+256]= uni_len;
1134
1135     }
1136 }
1137
1138 static void init_uni_mpeg4_rl_tab(RLTable *rl, uint32_t *bits_tab, uint8_t *len_tab){
1139     int slevel, run, last;
1140
1141     assert(MAX_LEVEL >= 64);
1142     assert(MAX_RUN   >= 63);
1143
1144     for(slevel=-64; slevel<64; slevel++){
1145         if(slevel==0) continue;
1146         for(run=0; run<64; run++){
1147             for(last=0; last<=1; last++){
1148                 const int index= UNI_MPEG4_ENC_INDEX(last, run, slevel+64);
1149                 int level= slevel < 0 ? -slevel : slevel;
1150                 int sign= slevel < 0 ? 1 : 0;
1151                 int bits, len, code;
1152                 int level1, run1;
1153
1154                 len_tab[index]= 100;
1155
1156                 /* ESC0 */
1157                 code= get_rl_index(rl, last, run, level);
1158                 bits= rl->table_vlc[code][0];
1159                 len=  rl->table_vlc[code][1];
1160                 bits=bits*2+sign; len++;
1161
1162                 if(code!=rl->n && len < len_tab[index]){
1163                     bits_tab[index]= bits;
1164                     len_tab [index]= len;
1165                 }
1166                 /* ESC1 */
1167                 bits= rl->table_vlc[rl->n][0];
1168                 len=  rl->table_vlc[rl->n][1];
1169                 bits=bits*2;    len++; //esc1
1170                 level1= level - rl->max_level[last][run];
1171                 if(level1>0){
1172                     code= get_rl_index(rl, last, run, level1);
1173                     bits<<= rl->table_vlc[code][1];
1174                     len  += rl->table_vlc[code][1];
1175                     bits += rl->table_vlc[code][0];
1176                     bits=bits*2+sign; len++;
1177
1178                     if(code!=rl->n && len < len_tab[index]){
1179                         bits_tab[index]= bits;
1180                         len_tab [index]= len;
1181                     }
1182                 }
1183                 /* ESC2 */
1184                 bits= rl->table_vlc[rl->n][0];
1185                 len=  rl->table_vlc[rl->n][1];
1186                 bits=bits*4+2;    len+=2; //esc2
1187                 run1 = run - rl->max_run[last][level] - 1;
1188                 if(run1>=0){
1189                     code= get_rl_index(rl, last, run1, level);
1190                     bits<<= rl->table_vlc[code][1];
1191                     len  += rl->table_vlc[code][1];
1192                     bits += rl->table_vlc[code][0];
1193                     bits=bits*2+sign; len++;
1194
1195                     if(code!=rl->n && len < len_tab[index]){
1196                         bits_tab[index]= bits;
1197                         len_tab [index]= len;
1198                     }
1199                 }
1200                 /* ESC3 */
1201                 bits= rl->table_vlc[rl->n][0];
1202                 len = rl->table_vlc[rl->n][1];
1203                 bits=bits*4+3;    len+=2; //esc3
1204                 bits=bits*2+last; len++;
1205                 bits=bits*64+run; len+=6;
1206                 bits=bits*2+1;    len++;  //marker
1207                 bits=bits*4096+(slevel&0xfff); len+=12;
1208                 bits=bits*2+1;    len++;  //marker
1209
1210                 if(len < len_tab[index]){
1211                     bits_tab[index]= bits;
1212                     len_tab [index]= len;
1213                 }
1214             }
1215         }
1216     }
1217 }
1218
1219 static av_cold int encode_init(AVCodecContext *avctx)
1220 {
1221     MpegEncContext *s = avctx->priv_data;
1222     int ret;
1223     static int done = 0;
1224
1225     if((ret=ff_MPV_encode_init(avctx)) < 0)
1226         return ret;
1227
1228     if (!done) {
1229         done = 1;
1230
1231         init_uni_dc_tab();
1232
1233         ff_init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
1234
1235         init_uni_mpeg4_rl_tab(&ff_mpeg4_rl_intra, uni_mpeg4_intra_rl_bits, uni_mpeg4_intra_rl_len);
1236         init_uni_mpeg4_rl_tab(&ff_h263_rl_inter, uni_mpeg4_inter_rl_bits, uni_mpeg4_inter_rl_len);
1237     }
1238
1239     s->min_qcoeff= -2048;
1240     s->max_qcoeff=  2047;
1241     s->intra_ac_vlc_length     = uni_mpeg4_intra_rl_len;
1242     s->intra_ac_vlc_last_length= uni_mpeg4_intra_rl_len + 128*64;
1243     s->inter_ac_vlc_length     = uni_mpeg4_inter_rl_len;
1244     s->inter_ac_vlc_last_length= uni_mpeg4_inter_rl_len + 128*64;
1245     s->luma_dc_vlc_length= uni_DCtab_lum_len;
1246     s->ac_esc_length= 7+2+1+6+1+12+1;
1247     s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table;
1248     s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
1249
1250     if(s->flags & CODEC_FLAG_GLOBAL_HEADER){
1251
1252         s->avctx->extradata= av_malloc(1024);
1253         init_put_bits(&s->pb, s->avctx->extradata, 1024);
1254
1255         if(!(s->workaround_bugs & FF_BUG_MS))
1256             mpeg4_encode_visual_object_header(s);
1257         mpeg4_encode_vol_header(s, 0, 0);
1258
1259 //            ff_mpeg4_stuffing(&s->pb); ?
1260         flush_put_bits(&s->pb);
1261         s->avctx->extradata_size= (put_bits_count(&s->pb)+7)>>3;
1262     }
1263     return 0;
1264 }
1265
1266 void ff_mpeg4_init_partitions(MpegEncContext *s)
1267 {
1268     uint8_t *start= put_bits_ptr(&s->pb);
1269     uint8_t *end= s->pb.buf_end;
1270     int size= end - start;
1271     int pb_size = (((intptr_t)start + size/3)&(~3)) - (intptr_t)start;
1272     int tex_size= (size - 2*pb_size)&(~3);
1273
1274     set_put_bits_buffer_size(&s->pb, pb_size);
1275     init_put_bits(&s->tex_pb, start + pb_size           , tex_size);
1276     init_put_bits(&s->pb2   , start + pb_size + tex_size, pb_size);
1277 }
1278
1279 void ff_mpeg4_merge_partitions(MpegEncContext *s)
1280 {
1281     const int pb2_len   = put_bits_count(&s->pb2   );
1282     const int tex_pb_len= put_bits_count(&s->tex_pb);
1283     const int bits= put_bits_count(&s->pb);
1284
1285     if(s->pict_type==AV_PICTURE_TYPE_I){
1286         put_bits(&s->pb, 19, DC_MARKER);
1287         s->misc_bits+=19 + pb2_len + bits - s->last_bits;
1288         s->i_tex_bits+= tex_pb_len;
1289     }else{
1290         put_bits(&s->pb, 17, MOTION_MARKER);
1291         s->misc_bits+=17 + pb2_len;
1292         s->mv_bits+= bits - s->last_bits;
1293         s->p_tex_bits+= tex_pb_len;
1294     }
1295
1296     flush_put_bits(&s->pb2);
1297     flush_put_bits(&s->tex_pb);
1298
1299     set_put_bits_buffer_size(&s->pb, s->pb2.buf_end - s->pb.buf);
1300     avpriv_copy_bits(&s->pb, s->pb2.buf   , pb2_len);
1301     avpriv_copy_bits(&s->pb, s->tex_pb.buf, tex_pb_len);
1302     s->last_bits= put_bits_count(&s->pb);
1303 }
1304
1305
1306 void ff_mpeg4_encode_video_packet_header(MpegEncContext *s)
1307 {
1308     int mb_num_bits= av_log2(s->mb_num - 1) + 1;
1309
1310     put_bits(&s->pb, ff_mpeg4_get_video_packet_prefix_length(s), 0);
1311     put_bits(&s->pb, 1, 1);
1312
1313     put_bits(&s->pb, mb_num_bits, s->mb_x + s->mb_y*s->mb_width);
1314     put_bits(&s->pb, s->quant_precision, s->qscale);
1315     put_bits(&s->pb, 1, 0); /* no HEC */
1316 }
1317
1318 #define OFFSET(x) offsetof(MpegEncContext, x)
1319 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
1320 static const AVOption options[] = {
1321     { "data_partitioning",       "Use data partitioning.",      OFFSET(data_partitioning), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
1322     { "alternate_scan",          "Enable alternate scantable.", OFFSET(alternate_scan),    AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
1323     { NULL },
1324 };
1325
1326 static const AVClass mpeg4enc_class = {
1327     .class_name = "MPEG4 encoder",
1328     .item_name  = av_default_item_name,
1329     .option     = options,
1330     .version    = LIBAVUTIL_VERSION_INT,
1331 };
1332
1333 AVCodec ff_mpeg4_encoder = {
1334     .name           = "mpeg4",
1335     .type           = AVMEDIA_TYPE_VIDEO,
1336     .id             = CODEC_ID_MPEG4,
1337     .priv_data_size = sizeof(MpegEncContext),
1338     .init           = encode_init,
1339     .encode         = ff_MPV_encode_picture,
1340     .close          = ff_MPV_encode_end,
1341     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
1342     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1343     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
1344     .priv_class     = &mpeg4enc_class,
1345 };