git.sesse.net Git - ffmpeg/blob - libavcodec/mpeg4videoenc.c

   1 /*
   2  * MPEG4 encoder.
   3  * Copyright (c) 2000,2001 Fabrice Bellard
   4  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "mpegvideo.h"
  24 #include "h263.h"
  25 #include "mpeg4video.h"
  26
  27 //The uni_DCtab_* tables below contain unified bits+length tables to encode DC
  28 //differences in mpeg4. Unified in the sense that the specification specifies
  29 //this encoding in several steps.
  30 static uint8_t uni_DCtab_lum_len[512];
  31 static uint8_t uni_DCtab_chrom_len[512];
  32 static uint16_t uni_DCtab_lum_bits[512];
  33 static uint16_t uni_DCtab_chrom_bits[512];
  34
  35 //unified encoding tables for run length encoding of coefficients
  36 //unified in the sense that the specification specifies the encoding in several steps.
  37 static uint32_t uni_mpeg4_intra_rl_bits[64*64*2*2];
  38 static uint8_t  uni_mpeg4_intra_rl_len [64*64*2*2];
  39 static uint32_t uni_mpeg4_inter_rl_bits[64*64*2*2];
  40 static uint8_t  uni_mpeg4_inter_rl_len [64*64*2*2];
  41 //#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128 + (run)*256 + (level))
  42 //#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run) + (level)*64)
  43 #define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run)*128 + (level))
  44
  45 /* mpeg4
  46 inter
  47 max level: 24/6
  48 max run: 53/63
  49
  50 intra
  51 max level: 53/16
  52 max run: 29/41
  53 */
  54
  55
  56 /**
  57  * Return the number of bits that encoding the 8x8 block in block would need.
  58  * @param[in]  block_last_index last index in scantable order that refers to a non zero element in block.
  59  */
  60 static inline int get_block_rate(MpegEncContext * s, DCTELEM block[64], int block_last_index, uint8_t scantable[64]){
  61     int last=0;
  62     int j;
  63     int rate=0;
  64
  65     for(j=1; j<=block_last_index; j++){
  66         const int index= scantable[j];
  67         int level= block[index];
  68         if(level){
  69             level+= 64;
  70             if((level&(~127)) == 0){
  71                 if(j<block_last_index) rate+= s->intra_ac_vlc_length     [UNI_AC_ENC_INDEX(j-last-1, level)];
  72                 else                   rate+= s->intra_ac_vlc_last_length[UNI_AC_ENC_INDEX(j-last-1, level)];
  73             }else
  74                 rate += s->ac_esc_length;
  75
  76             last= j;
  77         }
  78     }
  79
  80     return rate;
  81 }
  82
  83
  84 /**
  85  * Restore the ac coefficients in block that have been changed by decide_ac_pred().
  86  * This function also restores s->block_last_index.
  87  * @param[in,out] block MB coefficients, these will be restored
  88  * @param[in] dir ac prediction direction for each 8x8 block
  89  * @param[out] st scantable for each 8x8 block
  90  * @param[in] zigzag_last_index index refering to the last non zero coefficient in zigzag order
  91  */
  92 static inline void restore_ac_coeffs(MpegEncContext * s, DCTELEM block[6][64], const int dir[6], uint8_t *st[6], const int zigzag_last_index[6])
  93 {
  94     int i, n;
  95     memcpy(s->block_last_index, zigzag_last_index, sizeof(int)*6);
  96
  97     for(n=0; n<6; n++){
  98         int16_t *ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
  99
 100         st[n]= s->intra_scantable.permutated;
 101         if(dir[n]){
 102             /* top prediction */
 103             for(i=1; i<8; i++){
 104                 block[n][s->dsp.idct_permutation[i   ]] = ac_val[i+8];
 105             }
 106         }else{
 107             /* left prediction */
 108             for(i=1; i<8; i++){
 109                 block[n][s->dsp.idct_permutation[i<<3]]= ac_val[i  ];
 110             }
 111         }
 112     }
 113 }
 114
 115 /**
 116  * Return the optimal value (0 or 1) for the ac_pred element for the given MB in mpeg4.
 117  * This function will also update s->block_last_index and s->ac_val.
 118  * @param[in,out] block MB coefficients, these will be updated if 1 is returned
 119  * @param[in] dir ac prediction direction for each 8x8 block
 120  * @param[out] st scantable for each 8x8 block
 121  * @param[out] zigzag_last_index index refering to the last non zero coefficient in zigzag order
 122  */
 123 static inline int decide_ac_pred(MpegEncContext * s, DCTELEM block[6][64], const int dir[6], uint8_t *st[6], int zigzag_last_index[6])
 124 {
 125     int score= 0;
 126     int i, n;
 127     int8_t * const qscale_table= s->current_picture.qscale_table;
 128
 129     memcpy(zigzag_last_index, s->block_last_index, sizeof(int)*6);
 130
 131     for(n=0; n<6; n++){
 132         int16_t *ac_val, *ac_val1;
 133
 134         score -= get_block_rate(s, block[n], s->block_last_index[n], s->intra_scantable.permutated);
 135
 136         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
 137         ac_val1= ac_val;
 138         if(dir[n]){
 139             const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
 140             /* top prediction */
 141             ac_val-= s->block_wrap[n]*16;
 142             if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
 143                 /* same qscale */
 144                 for(i=1; i<8; i++){
 145                     const int level= block[n][s->dsp.idct_permutation[i   ]];
 146                     block[n][s->dsp.idct_permutation[i   ]] = level - ac_val[i+8];
 147                     ac_val1[i  ]=    block[n][s->dsp.idct_permutation[i<<3]];
 148                     ac_val1[i+8]= level;
 149                 }
 150             }else{
 151                 /* different qscale, we must rescale */
 152                 for(i=1; i<8; i++){
 153                     const int level= block[n][s->dsp.idct_permutation[i   ]];
 154                     block[n][s->dsp.idct_permutation[i   ]] = level - ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
 155                     ac_val1[i  ]=    block[n][s->dsp.idct_permutation[i<<3]];
 156                     ac_val1[i+8]= level;
 157                 }
 158             }
 159             st[n]= s->intra_h_scantable.permutated;
 160         }else{
 161             const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
 162             /* left prediction */
 163             ac_val-= 16;
 164             if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
 165                 /* same qscale */
 166                 for(i=1; i<8; i++){
 167                     const int level= block[n][s->dsp.idct_permutation[i<<3]];
 168                     block[n][s->dsp.idct_permutation[i<<3]]= level - ac_val[i];
 169                     ac_val1[i  ]= level;
 170                     ac_val1[i+8]=    block[n][s->dsp.idct_permutation[i   ]];
 171                 }
 172             }else{
 173                 /* different qscale, we must rescale */
 174                 for(i=1; i<8; i++){
 175                     const int level= block[n][s->dsp.idct_permutation[i<<3]];
 176                     block[n][s->dsp.idct_permutation[i<<3]]= level - ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
 177                     ac_val1[i  ]= level;
 178                     ac_val1[i+8]=    block[n][s->dsp.idct_permutation[i   ]];
 179                 }
 180             }
 181             st[n]= s->intra_v_scantable.permutated;
 182         }
 183
 184         for(i=63; i>0; i--) //FIXME optimize
 185             if(block[n][ st[n][i] ]) break;
 186         s->block_last_index[n]= i;
 187
 188         score += get_block_rate(s, block[n], s->block_last_index[n], st[n]);
 189     }
 190
 191     if(score < 0){
 192         return 1;
 193     }else{
 194         restore_ac_coeffs(s, block, dir, st, zigzag_last_index);
 195         return 0;
 196     }
 197 }
 198
 199 /**
 200  * modify mb_type & qscale so that encoding is acually possible in mpeg4
 201  */
 202 void ff_clean_mpeg4_qscales(MpegEncContext *s){
 203     int i;
 204     int8_t * const qscale_table= s->current_picture.qscale_table;
 205
 206     ff_clean_h263_qscales(s);
 207
 208     if(s->pict_type== FF_B_TYPE){
 209         int odd=0;
 210         /* ok, come on, this isn't funny anymore, there's more code for handling this mpeg4 mess than for the actual adaptive quantization */
 211
 212         for(i=0; i<s->mb_num; i++){
 213             int mb_xy= s->mb_index2xy[i];
 214             odd += qscale_table[mb_xy]&1;
 215         }
 216
 217         if(2*odd > s->mb_num) odd=1;
 218         else                  odd=0;
 219
 220         for(i=0; i<s->mb_num; i++){
 221             int mb_xy= s->mb_index2xy[i];
 222             if((qscale_table[mb_xy]&1) != odd)
 223                 qscale_table[mb_xy]++;
 224             if(qscale_table[mb_xy] > 31)
 225                 qscale_table[mb_xy]= 31;
 226         }
 227
 228         for(i=1; i<s->mb_num; i++){
 229             int mb_xy= s->mb_index2xy[i];
 230             if(qscale_table[mb_xy] != qscale_table[s->mb_index2xy[i-1]] && (s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_DIRECT)){
 231                 s->mb_type[mb_xy]|= CANDIDATE_MB_TYPE_BIDIR;
 232             }
 233         }
 234     }
 235 }
 236
 237
 238 /**
 239  * encodes the dc value.
 240  * @param n block index (0-3 are luma, 4-5 are chroma)
 241  */
 242 static inline void mpeg4_encode_dc(PutBitContext * s, int level, int n)
 243 {
 244 #if 1
 245     /* DC will overflow if level is outside the [-255,255] range. */
 246     level+=256;
 247     if (n < 4) {
 248         /* luminance */
 249         put_bits(s, uni_DCtab_lum_len[level], uni_DCtab_lum_bits[level]);
 250     } else {
 251         /* chrominance */
 252         put_bits(s, uni_DCtab_chrom_len[level], uni_DCtab_chrom_bits[level]);
 253     }
 254 #else
 255     int size, v;
 256     /* find number of bits */
 257     size = 0;
 258     v = abs(level);
 259     while (v) {
 260         v >>= 1;
 261         size++;
 262     }
 263
 264     if (n < 4) {
 265         /* luminance */
 266         put_bits(&s->pb, ff_mpeg4_DCtab_lum[size][1], ff_mpeg4_DCtab_lum[size][0]);
 267     } else {
 268         /* chrominance */
 269         put_bits(&s->pb, ff_mpeg4_DCtab_chrom[size][1], ff_mpeg4_DCtab_chrom[size][0]);
 270     }
 271
 272     /* encode remaining bits */
 273     if (size > 0) {
 274         if (level < 0)
 275             level = (-level) ^ ((1 << size) - 1);
 276         put_bits(&s->pb, size, level);
 277         if (size > 8)
 278             put_bits(&s->pb, 1, 1);
 279     }
 280 #endif
 281 }
 282
 283 static inline int mpeg4_get_dc_length(int level, int n){
 284     if (n < 4) {
 285         return uni_DCtab_lum_len[level + 256];
 286     } else {
 287         return uni_DCtab_chrom_len[level + 256];
 288     }
 289 }
 290
 291 /**
 292  * encodes a 8x8 block
 293  * @param n block index (0-3 are luma, 4-5 are chroma)
 294  */
 295 static inline void mpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n, int intra_dc,
 296                                uint8_t *scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb)
 297 {
 298     int i, last_non_zero;
 299 #if 0 //variables for the outcommented version
 300     int code, sign, last;
 301 #endif
 302     const RLTable *rl;
 303     uint32_t *bits_tab;
 304     uint8_t *len_tab;
 305     const int last_index = s->block_last_index[n];
 306
 307     if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
 308         /* mpeg4 based DC predictor */
 309         mpeg4_encode_dc(dc_pb, intra_dc, n);
 310         if(last_index<1) return;
 311         i = 1;
 312         rl = &ff_mpeg4_rl_intra;
 313         bits_tab= uni_mpeg4_intra_rl_bits;
 314         len_tab = uni_mpeg4_intra_rl_len;
 315     } else {
 316         if(last_index<0) return;
 317         i = 0;
 318         rl = &ff_h263_rl_inter;
 319         bits_tab= uni_mpeg4_inter_rl_bits;
 320         len_tab = uni_mpeg4_inter_rl_len;
 321     }
 322
 323     /* AC coefs */
 324     last_non_zero = i - 1;
 325 #if 1
 326     for (; i < last_index; i++) {
 327         int level = block[ scan_table[i] ];
 328         if (level) {
 329             int run = i - last_non_zero - 1;
 330             level+=64;
 331             if((level&(~127)) == 0){
 332                 const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
 333                 put_bits(ac_pb, len_tab[index], bits_tab[index]);
 334             }else{ //ESC3
 335                 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);
 336             }
 337             last_non_zero = i;
 338         }
 339     }
 340     /*if(i<=last_index)*/{
 341         int level = block[ scan_table[i] ];
 342         int run = i - last_non_zero - 1;
 343         level+=64;
 344         if((level&(~127)) == 0){
 345             const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
 346             put_bits(ac_pb, len_tab[index], bits_tab[index]);
 347         }else{ //ESC3
 348             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);
 349         }
 350     }
 351 #else
 352     for (; i <= last_index; i++) {
 353         const int slevel = block[ scan_table[i] ];
 354         if (slevel) {
 355             int level;
 356             int run = i - last_non_zero - 1;
 357             last = (i == last_index);
 358             sign = 0;
 359             level = slevel;
 360             if (level < 0) {
 361                 sign = 1;
 362                 level = -level;
 363             }
 364             code = get_rl_index(rl, last, run, level);
 365             put_bits(ac_pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
 366             if (code == rl->n) {
 367                 int level1, run1;
 368                 level1 = level - rl->max_level[last][run];
 369                 if (level1 < 1)
 370                     goto esc2;
 371                 code = get_rl_index(rl, last, run, level1);
 372                 if (code == rl->n) {
 373                 esc2:
 374                     put_bits(ac_pb, 1, 1);
 375                     if (level > MAX_LEVEL)
 376                         goto esc3;
 377                     run1 = run - rl->max_run[last][level] - 1;
 378                     if (run1 < 0)
 379                         goto esc3;
 380                     code = get_rl_index(rl, last, run1, level);
 381                     if (code == rl->n) {
 382                     esc3:
 383                         /* third escape */
 384                         put_bits(ac_pb, 1, 1);
 385                         put_bits(ac_pb, 1, last);
 386                         put_bits(ac_pb, 6, run);
 387                         put_bits(ac_pb, 1, 1);
 388                         put_sbits(ac_pb, 12, slevel);
 389                         put_bits(ac_pb, 1, 1);
 390                     } else {
 391                         /* second escape */
 392                         put_bits(ac_pb, 1, 0);
 393                         put_bits(ac_pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
 394                         put_bits(ac_pb, 1, sign);
 395                     }
 396                 } else {
 397                     /* first escape */
 398                     put_bits(ac_pb, 1, 0);
 399                     put_bits(ac_pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
 400                     put_bits(ac_pb, 1, sign);
 401                 }
 402             } else {
 403                 put_bits(ac_pb, 1, sign);
 404             }
 405             last_non_zero = i;
 406         }
 407     }
 408 #endif
 409 }
 410
 411 static int mpeg4_get_block_length(MpegEncContext * s, DCTELEM * block, int n, int intra_dc,
 412                                uint8_t *scan_table)
 413 {
 414     int i, last_non_zero;
 415     uint8_t *len_tab;
 416     const int last_index = s->block_last_index[n];
 417     int len=0;
 418
 419     if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
 420         /* mpeg4 based DC predictor */
 421         len += mpeg4_get_dc_length(intra_dc, n);
 422         if(last_index<1) return len;
 423         i = 1;
 424         len_tab = uni_mpeg4_intra_rl_len;
 425     } else {
 426         if(last_index<0) return 0;
 427         i = 0;
 428         len_tab = uni_mpeg4_inter_rl_len;
 429     }
 430
 431     /* AC coefs */
 432     last_non_zero = i - 1;
 433     for (; i < last_index; i++) {
 434         int level = block[ scan_table[i] ];
 435         if (level) {
 436             int run = i - last_non_zero - 1;
 437             level+=64;
 438             if((level&(~127)) == 0){
 439                 const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
 440                 len += len_tab[index];
 441             }else{ //ESC3
 442                 len += 7+2+1+6+1+12+1;
 443             }
 444             last_non_zero = i;
 445         }
 446     }
 447     /*if(i<=last_index)*/{
 448         int level = block[ scan_table[i] ];
 449         int run = i - last_non_zero - 1;
 450         level+=64;
 451         if((level&(~127)) == 0){
 452             const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
 453             len += len_tab[index];
 454         }else{ //ESC3
 455             len += 7+2+1+6+1+12+1;
 456         }
 457     }
 458
 459     return len;
 460 }
 461
 462 static inline void mpeg4_encode_blocks(MpegEncContext * s, DCTELEM block[6][64], int intra_dc[6],
 463                                uint8_t **scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb){
 464     int i;
 465
 466     if(scan_table){
 467         if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
 468             for (i = 0; i < 6; i++) {
 469                 skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, intra_dc[i], scan_table[i]));
 470             }
 471         }else{
 472             /* encode each block */
 473             for (i = 0; i < 6; i++) {
 474                 mpeg4_encode_block(s, block[i], i, intra_dc[i], scan_table[i], dc_pb, ac_pb);
 475             }
 476         }
 477     }else{
 478         if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
 479             for (i = 0; i < 6; i++) {
 480                 skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, 0, s->intra_scantable.permutated));
 481             }
 482         }else{
 483             /* encode each block */
 484             for (i = 0; i < 6; i++) {
 485                 mpeg4_encode_block(s, block[i], i, 0, s->intra_scantable.permutated, dc_pb, ac_pb);
 486             }
 487         }
 488     }
 489 }
 490
 491 //FIXME this is duplicated to h263.c
 492 static const int dquant_code[5]= {1,0,9,2,3};
 493
 494 void mpeg4_encode_mb(MpegEncContext * s,
 495                     DCTELEM block[6][64],
 496                     int motion_x, int motion_y)
 497 {
 498     int cbpc, cbpy, pred_x, pred_y;
 499     PutBitContext * const pb2    = s->data_partitioning                         ? &s->pb2    : &s->pb;
 500     PutBitContext * const tex_pb = s->data_partitioning && s->pict_type!=FF_B_TYPE ? &s->tex_pb : &s->pb;
 501     PutBitContext * const dc_pb  = s->data_partitioning && s->pict_type!=FF_I_TYPE ? &s->pb2    : &s->pb;
 502     const int interleaved_stats= (s->flags&CODEC_FLAG_PASS1) && !s->data_partitioning ? 1 : 0;
 503
 504     if (!s->mb_intra) {
 505         int i, cbp;
 506
 507         if(s->pict_type==FF_B_TYPE){
 508             static const int mb_type_table[8]= {-1, 3, 2, 1,-1,-1,-1, 0}; /* convert from mv_dir to type */
 509             int mb_type=  mb_type_table[s->mv_dir];
 510
 511             if(s->mb_x==0){
 512                 for(i=0; i<2; i++){
 513                     s->last_mv[i][0][0]=
 514                     s->last_mv[i][0][1]=
 515                     s->last_mv[i][1][0]=
 516                     s->last_mv[i][1][1]= 0;
 517                 }
 518             }
 519
 520             assert(s->dquant>=-2 && s->dquant<=2);
 521             assert((s->dquant&1)==0);
 522             assert(mb_type>=0);
 523
 524             /* nothing to do if this MB was skipped in the next P Frame */
 525             if(s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]){ //FIXME avoid DCT & ...
 526                 s->skip_count++;
 527                 s->mv[0][0][0]=
 528                 s->mv[0][0][1]=
 529                 s->mv[1][0][0]=
 530                 s->mv[1][0][1]= 0;
 531                 s->mv_dir= MV_DIR_FORWARD; //doesn't matter
 532                 s->qscale -= s->dquant;
 533 //                s->mb_skipped=1;
 534
 535                 return;
 536             }
 537
 538             cbp= get_b_cbp(s, block, motion_x, motion_y, mb_type);
 539
 540             if ((cbp | motion_x | motion_y | mb_type) ==0) {
 541                 /* direct MB with MV={0,0} */
 542                 assert(s->dquant==0);
 543
 544                 put_bits(&s->pb, 1, 1); /* mb not coded modb1=1 */
 545
 546                 if(interleaved_stats){
 547                     s->misc_bits++;
 548                     s->last_bits++;
 549                 }
 550                 s->skip_count++;
 551                 return;
 552             }
 553
 554             put_bits(&s->pb, 1, 0);     /* mb coded modb1=0 */
 555             put_bits(&s->pb, 1, cbp ? 0 : 1); /* modb2 */ //FIXME merge
 556             put_bits(&s->pb, mb_type+1, 1); // this table is so simple that we don't need it :)
 557             if(cbp) put_bits(&s->pb, 6, cbp);
 558
 559             if(cbp && mb_type){
 560                 if(s->dquant)
 561                     put_bits(&s->pb, 2, (s->dquant>>2)+3);
 562                 else
 563                     put_bits(&s->pb, 1, 0);
 564             }else
 565                 s->qscale -= s->dquant;
 566
 567             if(!s->progressive_sequence){
 568                 if(cbp)
 569                     put_bits(&s->pb, 1, s->interlaced_dct);
 570                 if(mb_type) // not direct mode
 571                     put_bits(&s->pb, 1, s->mv_type == MV_TYPE_FIELD);
 572             }
 573
 574             if(interleaved_stats){
 575                 s->misc_bits+= get_bits_diff(s);
 576             }
 577
 578             if(mb_type == 0){
 579                 assert(s->mv_dir & MV_DIRECT);
 580                 ff_h263_encode_motion_vector(s, motion_x, motion_y, 1);
 581                 s->b_count++;
 582                 s->f_count++;
 583             }else{
 584                 assert(mb_type > 0 && mb_type < 4);
 585                 if(s->mv_type != MV_TYPE_FIELD){
 586                     if(s->mv_dir & MV_DIR_FORWARD){
 587                         ff_h263_encode_motion_vector(s, s->mv[0][0][0] - s->last_mv[0][0][0],
 588                                                         s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 589                         s->last_mv[0][0][0]= s->last_mv[0][1][0]= s->mv[0][0][0];
 590                         s->last_mv[0][0][1]= s->last_mv[0][1][1]= s->mv[0][0][1];
 591                         s->f_count++;
 592                     }
 593                     if(s->mv_dir & MV_DIR_BACKWARD){
 594                         ff_h263_encode_motion_vector(s, s->mv[1][0][0] - s->last_mv[1][0][0],
 595                                                         s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 596                         s->last_mv[1][0][0]= s->last_mv[1][1][0]= s->mv[1][0][0];
 597                         s->last_mv[1][0][1]= s->last_mv[1][1][1]= s->mv[1][0][1];
 598                         s->b_count++;
 599                     }
 600                 }else{
 601                     if(s->mv_dir & MV_DIR_FORWARD){
 602                         put_bits(&s->pb, 1, s->field_select[0][0]);
 603                         put_bits(&s->pb, 1, s->field_select[0][1]);
 604                     }
 605                     if(s->mv_dir & MV_DIR_BACKWARD){
 606                         put_bits(&s->pb, 1, s->field_select[1][0]);
 607                         put_bits(&s->pb, 1, s->field_select[1][1]);
 608                     }
 609                     if(s->mv_dir & MV_DIR_FORWARD){
 610                         for(i=0; i<2; i++){
 611                             ff_h263_encode_motion_vector(s, s->mv[0][i][0] - s->last_mv[0][i][0]  ,
 612                                                             s->mv[0][i][1] - s->last_mv[0][i][1]/2, s->f_code);
 613                             s->last_mv[0][i][0]= s->mv[0][i][0];
 614                             s->last_mv[0][i][1]= s->mv[0][i][1]*2;
 615                         }
 616                         s->f_count++;
 617                     }
 618                     if(s->mv_dir & MV_DIR_BACKWARD){
 619                         for(i=0; i<2; i++){
 620                             ff_h263_encode_motion_vector(s, s->mv[1][i][0] - s->last_mv[1][i][0]  ,
 621                                                             s->mv[1][i][1] - s->last_mv[1][i][1]/2, s->b_code);
 622                             s->last_mv[1][i][0]= s->mv[1][i][0];
 623                             s->last_mv[1][i][1]= s->mv[1][i][1]*2;
 624                         }
 625                         s->b_count++;
 626                     }
 627                 }
 628             }
 629
 630             if(interleaved_stats){
 631                 s->mv_bits+= get_bits_diff(s);
 632             }
 633
 634             mpeg4_encode_blocks(s, block, NULL, NULL, NULL, &s->pb);
 635
 636             if(interleaved_stats){
 637                 s->p_tex_bits+= get_bits_diff(s);
 638             }
 639
 640         }else{ /* s->pict_type==FF_B_TYPE */
 641             cbp= get_p_cbp(s, block, motion_x, motion_y);
 642
 643             if ((cbp | motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16) {
 644                 /* check if the B frames can skip it too, as we must skip it if we skip here
 645                    why didn't they just compress the skip-mb bits instead of reusing them ?! */
 646                 if(s->max_b_frames>0){
 647                     int i;
 648                     int x,y, offset;
 649                     uint8_t *p_pic;
 650
 651                     x= s->mb_x*16;
 652                     y= s->mb_y*16;
 653
 654                     offset= x + y*s->linesize;
 655                     p_pic= s->new_picture.data[0] + offset;
 656
 657                     s->mb_skipped=1;
 658                     for(i=0; i<s->max_b_frames; i++){
 659                         uint8_t *b_pic;
 660                         int diff;
 661                         Picture *pic= s->reordered_input_picture[i+1];
 662
 663                         if(pic==NULL || pic->pict_type!=FF_B_TYPE) break;
 664
 665                         b_pic= pic->data[0] + offset;
 666                         if(pic->type != FF_BUFFER_TYPE_SHARED)
 667                             b_pic+= INPLACE_OFFSET;
 668
 669                         if(x+16 > s->width || y+16 > s->height){
 670                             int x1,y1;
 671                             int xe= FFMIN(16, s->width - x);
 672                             int ye= FFMIN(16, s->height- y);
 673                             diff=0;
 674                             for(y1=0; y1<ye; y1++){
 675                                 for(x1=0; x1<xe; x1++){
 676                                     diff+= FFABS(p_pic[x1+y1*s->linesize] - b_pic[x1+y1*s->linesize]);
 677                                 }
 678                             }
 679                             diff= diff*256/(xe*ye);
 680                         }else{
 681                             diff= s->dsp.sad[0](NULL, p_pic, b_pic, s->linesize, 16);
 682                         }
 683                         if(diff>s->qscale*70){ //FIXME check that 70 is optimal
 684                             s->mb_skipped=0;
 685                             break;
 686                         }
 687                     }
 688                 }else
 689                     s->mb_skipped=1;
 690
 691                 if(s->mb_skipped==1){
 692                     /* skip macroblock */
 693                     put_bits(&s->pb, 1, 1);
 694
 695                     if(interleaved_stats){
 696                         s->misc_bits++;
 697                         s->last_bits++;
 698                     }
 699                     s->skip_count++;
 700
 701                     return;
 702                 }
 703             }
 704
 705             put_bits(&s->pb, 1, 0);     /* mb coded */
 706             cbpc = cbp & 3;
 707             cbpy = cbp >> 2;
 708             cbpy ^= 0xf;
 709             if(s->mv_type==MV_TYPE_16X16){
 710                 if(s->dquant) cbpc+= 8;
 711                 put_bits(&s->pb,
 712                         ff_h263_inter_MCBPC_bits[cbpc],
 713                         ff_h263_inter_MCBPC_code[cbpc]);
 714
 715                 put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
 716                 if(s->dquant)
 717                     put_bits(pb2, 2, dquant_code[s->dquant+2]);
 718
 719                 if(!s->progressive_sequence){
 720                     if(cbp)
 721                         put_bits(pb2, 1, s->interlaced_dct);
 722                     put_bits(pb2, 1, 0);
 723                 }
 724
 725                 if(interleaved_stats){
 726                     s->misc_bits+= get_bits_diff(s);
 727                 }
 728
 729                 /* motion vectors: 16x16 mode */
 730                 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
 731
 732                 ff_h263_encode_motion_vector(s, motion_x - pred_x,
 733                                                 motion_y - pred_y, s->f_code);
 734             }else if(s->mv_type==MV_TYPE_FIELD){
 735                 if(s->dquant) cbpc+= 8;
 736                 put_bits(&s->pb,
 737                         ff_h263_inter_MCBPC_bits[cbpc],
 738                         ff_h263_inter_MCBPC_code[cbpc]);
 739
 740                 put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
 741                 if(s->dquant)
 742                     put_bits(pb2, 2, dquant_code[s->dquant+2]);
 743
 744                 assert(!s->progressive_sequence);
 745                 if(cbp)
 746                     put_bits(pb2, 1, s->interlaced_dct);
 747                 put_bits(pb2, 1, 1);
 748
 749                 if(interleaved_stats){
 750                     s->misc_bits+= get_bits_diff(s);
 751                 }
 752
 753                 /* motion vectors: 16x8 interlaced mode */
 754                 h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
 755                 pred_y /=2;
 756
 757                 put_bits(&s->pb, 1, s->field_select[0][0]);
 758                 put_bits(&s->pb, 1, s->field_select[0][1]);
 759
 760                 ff_h263_encode_motion_vector(s, s->mv[0][0][0] - pred_x,
 761                                                 s->mv[0][0][1] - pred_y, s->f_code);
 762                 ff_h263_encode_motion_vector(s, s->mv[0][1][0] - pred_x,
 763                                                 s->mv[0][1][1] - pred_y, s->f_code);
 764             }else{
 765                 assert(s->mv_type==MV_TYPE_8X8);
 766                 put_bits(&s->pb,
 767                         ff_h263_inter_MCBPC_bits[cbpc+16],
 768                         ff_h263_inter_MCBPC_code[cbpc+16]);
 769                 put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
 770
 771                 if(!s->progressive_sequence){
 772                     if(cbp)
 773                         put_bits(pb2, 1, s->interlaced_dct);
 774                 }
 775
 776                 if(interleaved_stats){
 777                     s->misc_bits+= get_bits_diff(s);
 778                 }
 779
 780                 for(i=0; i<4; i++){
 781                     /* motion vectors: 8x8 mode*/
 782                     h263_pred_motion(s, i, 0, &pred_x, &pred_y);
 783
 784                     ff_h263_encode_motion_vector(s, s->current_picture.motion_val[0][ s->block_index[i] ][0] - pred_x,
 785                                                     s->current_picture.motion_val[0][ s->block_index[i] ][1] - pred_y, s->f_code);
 786                 }
 787             }
 788
 789             if(interleaved_stats){
 790                 s->mv_bits+= get_bits_diff(s);
 791             }
 792
 793             mpeg4_encode_blocks(s, block, NULL, NULL, NULL, tex_pb);
 794
 795             if(interleaved_stats){
 796                 s->p_tex_bits+= get_bits_diff(s);
 797             }
 798             s->f_count++;
 799         }
 800     } else {
 801         int cbp;
 802         int dc_diff[6];   //dc values with the dc prediction subtracted
 803         int dir[6];  //prediction direction
 804         int zigzag_last_index[6];
 805         uint8_t *scan_table[6];
 806         int i;
 807
 808         for(i=0; i<6; i++){
 809             dc_diff[i]= ff_mpeg4_pred_dc(s, i, block[i][0], &dir[i], 1);
 810         }
 811
 812         if(s->flags & CODEC_FLAG_AC_PRED){
 813             s->ac_pred= decide_ac_pred(s, block, dir, scan_table, zigzag_last_index);
 814         }else{
 815             for(i=0; i<6; i++)
 816                 scan_table[i]= s->intra_scantable.permutated;
 817         }
 818
 819         /* compute cbp */
 820         cbp = 0;
 821         for (i = 0; i < 6; i++) {
 822             if (s->block_last_index[i] >= 1)
 823                 cbp |= 1 << (5 - i);
 824         }
 825
 826         cbpc = cbp & 3;
 827         if (s->pict_type == FF_I_TYPE) {
 828             if(s->dquant) cbpc+=4;
 829             put_bits(&s->pb,
 830                 ff_h263_intra_MCBPC_bits[cbpc],
 831                 ff_h263_intra_MCBPC_code[cbpc]);
 832         } else {
 833             if(s->dquant) cbpc+=8;
 834             put_bits(&s->pb, 1, 0);     /* mb coded */
 835             put_bits(&s->pb,
 836                 ff_h263_inter_MCBPC_bits[cbpc + 4],
 837                 ff_h263_inter_MCBPC_code[cbpc + 4]);
 838         }
 839         put_bits(pb2, 1, s->ac_pred);
 840         cbpy = cbp >> 2;
 841         put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
 842         if(s->dquant)
 843             put_bits(dc_pb, 2, dquant_code[s->dquant+2]);
 844
 845         if(!s->progressive_sequence){
 846             put_bits(dc_pb, 1, s->interlaced_dct);
 847         }
 848
 849         if(interleaved_stats){
 850             s->misc_bits+= get_bits_diff(s);
 851         }
 852
 853         mpeg4_encode_blocks(s, block, dc_diff, scan_table, dc_pb, tex_pb);
 854
 855         if(interleaved_stats){
 856             s->i_tex_bits+= get_bits_diff(s);
 857         }
 858         s->i_count++;
 859
 860         /* restore ac coeffs & last_index stuff if we messed them up with the prediction */
 861         if(s->ac_pred)
 862             restore_ac_coeffs(s, block, dir, scan_table, zigzag_last_index);
 863     }
 864 }
 865
 866 /**
 867  * add mpeg4 stuffing bits (01...1)
 868  */
 869 void ff_mpeg4_stuffing(PutBitContext * pbc)
 870 {
 871     int length;
 872     put_bits(pbc, 1, 0);
 873     length= (-put_bits_count(pbc))&7;
 874     if(length) put_bits(pbc, length, (1<<length)-1);
 875 }
 876
 877 /* must be called before writing the header */
 878 void ff_set_mpeg4_time(MpegEncContext * s){
 879     if(s->pict_type==FF_B_TYPE){
 880         ff_mpeg4_init_direct_mv(s);
 881     }else{
 882         s->last_time_base= s->time_base;
 883         s->time_base= s->time/s->avctx->time_base.den;
 884     }
 885 }
 886
 887 static void mpeg4_encode_gop_header(MpegEncContext * s){
 888     int hours, minutes, seconds;
 889     int64_t time;
 890
 891     put_bits(&s->pb, 16, 0);
 892     put_bits(&s->pb, 16, GOP_STARTCODE);
 893
 894     time= s->current_picture_ptr->pts;
 895     if(s->reordered_input_picture[1])
 896         time= FFMIN(time, s->reordered_input_picture[1]->pts);
 897     time= time*s->avctx->time_base.num;
 898
 899     seconds= time/s->avctx->time_base.den;
 900     minutes= seconds/60; seconds %= 60;
 901     hours= minutes/60; minutes %= 60;
 902     hours%=24;
 903
 904     put_bits(&s->pb, 5, hours);
 905     put_bits(&s->pb, 6, minutes);
 906     put_bits(&s->pb, 1, 1);
 907     put_bits(&s->pb, 6, seconds);
 908
 909     put_bits(&s->pb, 1, !!(s->flags&CODEC_FLAG_CLOSED_GOP));
 910     put_bits(&s->pb, 1, 0); //broken link == NO
 911
 912     s->last_time_base= time / s->avctx->time_base.den;
 913
 914     ff_mpeg4_stuffing(&s->pb);
 915 }
 916
 917 static void mpeg4_encode_visual_object_header(MpegEncContext * s){
 918     int profile_and_level_indication;
 919     int vo_ver_id;
 920
 921     if(s->avctx->profile != FF_PROFILE_UNKNOWN){
 922         profile_and_level_indication = s->avctx->profile << 4;
 923     }else if(s->max_b_frames || s->quarter_sample){
 924         profile_and_level_indication= 0xF0; // adv simple
 925     }else{
 926         profile_and_level_indication= 0x00; // simple
 927     }
 928
 929     if(s->avctx->level != FF_LEVEL_UNKNOWN){
 930         profile_and_level_indication |= s->avctx->level;
 931     }else{
 932         profile_and_level_indication |= 1; //level 1
 933     }
 934
 935     if(profile_and_level_indication>>4 == 0xF){
 936         vo_ver_id= 5;
 937     }else{
 938         vo_ver_id= 1;
 939     }
 940
 941     //FIXME levels
 942
 943     put_bits(&s->pb, 16, 0);
 944     put_bits(&s->pb, 16, VOS_STARTCODE);
 945
 946     put_bits(&s->pb, 8, profile_and_level_indication);
 947
 948     put_bits(&s->pb, 16, 0);
 949     put_bits(&s->pb, 16, VISUAL_OBJ_STARTCODE);
 950
 951     put_bits(&s->pb, 1, 1);
 952         put_bits(&s->pb, 4, vo_ver_id);
 953         put_bits(&s->pb, 3, 1); //priority
 954
 955     put_bits(&s->pb, 4, 1); //visual obj type== video obj
 956
 957     put_bits(&s->pb, 1, 0); //video signal type == no clue //FIXME
 958
 959     ff_mpeg4_stuffing(&s->pb);
 960 }
 961
 962 static void mpeg4_encode_vol_header(MpegEncContext * s, int vo_number, int vol_number)
 963 {
 964     int vo_ver_id;
 965
 966     if (!CONFIG_MPEG4_ENCODER)  return;
 967
 968     if(s->max_b_frames || s->quarter_sample){
 969         vo_ver_id= 5;
 970         s->vo_type= ADV_SIMPLE_VO_TYPE;
 971     }else{
 972         vo_ver_id= 1;
 973         s->vo_type= SIMPLE_VO_TYPE;
 974     }
 975
 976     put_bits(&s->pb, 16, 0);
 977     put_bits(&s->pb, 16, 0x100 + vo_number);        /* video obj */
 978     put_bits(&s->pb, 16, 0);
 979     put_bits(&s->pb, 16, 0x120 + vol_number);       /* video obj layer */
 980
 981     put_bits(&s->pb, 1, 0);             /* random access vol */
 982     put_bits(&s->pb, 8, s->vo_type);    /* video obj type indication */
 983     if(s->workaround_bugs & FF_BUG_MS) {
 984         put_bits(&s->pb, 1, 0);         /* is obj layer id= no */
 985     } else {
 986         put_bits(&s->pb, 1, 1);         /* is obj layer id= yes */
 987         put_bits(&s->pb, 4, vo_ver_id); /* is obj layer ver id */
 988         put_bits(&s->pb, 3, 1);         /* is obj layer priority */
 989     }
 990
 991     s->aspect_ratio_info= ff_h263_aspect_to_info(s->avctx->sample_aspect_ratio);
 992
 993     put_bits(&s->pb, 4, s->aspect_ratio_info);/* aspect ratio info */
 994     if (s->aspect_ratio_info == FF_ASPECT_EXTENDED){
 995         put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.num);
 996         put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.den);
 997     }
 998
 999     if(s->workaround_bugs & FF_BUG_MS) { //
1000         put_bits(&s->pb, 1, 0);         /* vol control parameters= no @@@ */
1001     } else {
1002         put_bits(&s->pb, 1, 1);         /* vol control parameters= yes */
1003         put_bits(&s->pb, 2, 1);         /* chroma format YUV 420/YV12 */
1004         put_bits(&s->pb, 1, s->low_delay);
1005         put_bits(&s->pb, 1, 0);         /* vbv parameters= no */
1006     }
1007
1008     put_bits(&s->pb, 2, RECT_SHAPE);    /* vol shape= rectangle */
1009     put_bits(&s->pb, 1, 1);             /* marker bit */
1010
1011     put_bits(&s->pb, 16, s->avctx->time_base.den);
1012     if (s->time_increment_bits < 1)
1013         s->time_increment_bits = 1;
1014     put_bits(&s->pb, 1, 1);             /* marker bit */
1015     put_bits(&s->pb, 1, 0);             /* fixed vop rate=no */
1016     put_bits(&s->pb, 1, 1);             /* marker bit */
1017     put_bits(&s->pb, 13, s->width);     /* vol width */
1018     put_bits(&s->pb, 1, 1);             /* marker bit */
1019     put_bits(&s->pb, 13, s->height);    /* vol height */
1020     put_bits(&s->pb, 1, 1);             /* marker bit */
1021     put_bits(&s->pb, 1, s->progressive_sequence ? 0 : 1);
1022     put_bits(&s->pb, 1, 1);             /* obmc disable */
1023     if (vo_ver_id == 1) {
1024         put_bits(&s->pb, 1, s->vol_sprite_usage);       /* sprite enable */
1025     }else{
1026         put_bits(&s->pb, 2, s->vol_sprite_usage);       /* sprite enable */
1027     }
1028
1029     put_bits(&s->pb, 1, 0);             /* not 8 bit == false */
1030     put_bits(&s->pb, 1, s->mpeg_quant); /* quant type= (0=h263 style)*/
1031
1032     if(s->mpeg_quant){
1033         ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
1034         ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
1035     }
1036
1037     if (vo_ver_id != 1)
1038         put_bits(&s->pb, 1, s->quarter_sample);
1039     put_bits(&s->pb, 1, 1);             /* complexity estimation disable */
1040     s->resync_marker= s->rtp_mode;
1041     put_bits(&s->pb, 1, s->resync_marker ? 0 : 1);/* resync marker disable */
1042     put_bits(&s->pb, 1, s->data_partitioning ? 1 : 0);
1043     if(s->data_partitioning){
1044         put_bits(&s->pb, 1, 0);         /* no rvlc */
1045     }
1046
1047     if (vo_ver_id != 1){
1048         put_bits(&s->pb, 1, 0);         /* newpred */
1049         put_bits(&s->pb, 1, 0);         /* reduced res vop */
1050     }
1051     put_bits(&s->pb, 1, 0);             /* scalability */
1052
1053     ff_mpeg4_stuffing(&s->pb);
1054
1055     /* user data */
1056     if(!(s->flags & CODEC_FLAG_BITEXACT)){
1057         put_bits(&s->pb, 16, 0);
1058         put_bits(&s->pb, 16, 0x1B2);    /* user_data */
1059         ff_put_string(&s->pb, LIBAVCODEC_IDENT, 0);
1060     }
1061 }
1062
1063 /* write mpeg4 VOP header */
1064 void mpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
1065 {
1066     int time_incr;
1067     int time_div, time_mod;
1068
1069     if(s->pict_type==FF_I_TYPE){
1070         if(!(s->flags&CODEC_FLAG_GLOBAL_HEADER)){
1071             if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT) //HACK, the reference sw is buggy
1072                 mpeg4_encode_visual_object_header(s);
1073             if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT || picture_number==0) //HACK, the reference sw is buggy
1074                 mpeg4_encode_vol_header(s, 0, 0);
1075         }
1076         if(!(s->workaround_bugs & FF_BUG_MS))
1077             mpeg4_encode_gop_header(s);
1078     }
1079
1080     s->partitioned_frame= s->data_partitioning && s->pict_type!=FF_B_TYPE;
1081
1082     put_bits(&s->pb, 16, 0);                /* vop header */
1083     put_bits(&s->pb, 16, VOP_STARTCODE);    /* vop header */
1084     put_bits(&s->pb, 2, s->pict_type - 1);  /* pict type: I = 0 , P = 1 */
1085
1086     assert(s->time>=0);
1087     time_div= s->time/s->avctx->time_base.den;
1088     time_mod= s->time%s->avctx->time_base.den;
1089     time_incr= time_div - s->last_time_base;
1090     assert(time_incr >= 0);
1091     while(time_incr--)
1092         put_bits(&s->pb, 1, 1);
1093
1094     put_bits(&s->pb, 1, 0);
1095
1096     put_bits(&s->pb, 1, 1);                             /* marker */
1097     put_bits(&s->pb, s->time_increment_bits, time_mod); /* time increment */
1098     put_bits(&s->pb, 1, 1);                             /* marker */
1099     put_bits(&s->pb, 1, 1);                             /* vop coded */
1100     if (    s->pict_type == FF_P_TYPE
1101         || (s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE)) {
1102         put_bits(&s->pb, 1, s->no_rounding);    /* rounding type */
1103     }
1104     put_bits(&s->pb, 3, 0);     /* intra dc VLC threshold */
1105     if(!s->progressive_sequence){
1106          put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
1107          put_bits(&s->pb, 1, s->alternate_scan);
1108     }
1109     //FIXME sprite stuff
1110
1111     put_bits(&s->pb, 5, s->qscale);
1112
1113     if (s->pict_type != FF_I_TYPE)
1114         put_bits(&s->pb, 3, s->f_code); /* fcode_for */
1115     if (s->pict_type == FF_B_TYPE)
1116         put_bits(&s->pb, 3, s->b_code); /* fcode_back */
1117 }
1118
1119
1120 static void init_uni_dc_tab(void)
1121 {
1122     int level, uni_code, uni_len;
1123
1124     for(level=-256; level<256; level++){
1125         int size, v, l;
1126         /* find number of bits */
1127         size = 0;
1128         v = abs(level);
1129         while (v) {
1130             v >>= 1;
1131             size++;
1132         }
1133
1134         if (level < 0)
1135             l= (-level) ^ ((1 << size) - 1);
1136         else
1137             l= level;
1138
1139         /* luminance */
1140         uni_code= ff_mpeg4_DCtab_lum[size][0];
1141         uni_len = ff_mpeg4_DCtab_lum[size][1];
1142
1143         if (size > 0) {
1144             uni_code<<=size; uni_code|=l;
1145             uni_len+=size;
1146             if (size > 8){
1147                 uni_code<<=1; uni_code|=1;
1148                 uni_len++;
1149             }
1150         }
1151         uni_DCtab_lum_bits[level+256]= uni_code;
1152         uni_DCtab_lum_len [level+256]= uni_len;
1153
1154         /* chrominance */
1155         uni_code= ff_mpeg4_DCtab_chrom[size][0];
1156         uni_len = ff_mpeg4_DCtab_chrom[size][1];
1157
1158         if (size > 0) {
1159             uni_code<<=size; uni_code|=l;
1160             uni_len+=size;
1161             if (size > 8){
1162                 uni_code<<=1; uni_code|=1;
1163                 uni_len++;
1164             }
1165         }
1166         uni_DCtab_chrom_bits[level+256]= uni_code;
1167         uni_DCtab_chrom_len [level+256]= uni_len;
1168
1169     }
1170 }
1171
1172 static void init_uni_mpeg4_rl_tab(RLTable *rl, uint32_t *bits_tab, uint8_t *len_tab){
1173     int slevel, run, last;
1174
1175     assert(MAX_LEVEL >= 64);
1176     assert(MAX_RUN   >= 63);
1177
1178     for(slevel=-64; slevel<64; slevel++){
1179         if(slevel==0) continue;
1180         for(run=0; run<64; run++){
1181             for(last=0; last<=1; last++){
1182                 const int index= UNI_MPEG4_ENC_INDEX(last, run, slevel+64);
1183                 int level= slevel < 0 ? -slevel : slevel;
1184                 int sign= slevel < 0 ? 1 : 0;
1185                 int bits, len, code;
1186                 int level1, run1;
1187
1188                 len_tab[index]= 100;
1189
1190                 /* ESC0 */
1191                 code= get_rl_index(rl, last, run, level);
1192                 bits= rl->table_vlc[code][0];
1193                 len=  rl->table_vlc[code][1];
1194                 bits=bits*2+sign; len++;
1195
1196                 if(code!=rl->n && len < len_tab[index]){
1197                     bits_tab[index]= bits;
1198                     len_tab [index]= len;
1199                 }
1200                 /* ESC1 */
1201                 bits= rl->table_vlc[rl->n][0];
1202                 len=  rl->table_vlc[rl->n][1];
1203                 bits=bits*2;    len++; //esc1
1204                 level1= level - rl->max_level[last][run];
1205                 if(level1>0){
1206                     code= get_rl_index(rl, last, run, level1);
1207                     bits<<= rl->table_vlc[code][1];
1208                     len  += rl->table_vlc[code][1];
1209                     bits += rl->table_vlc[code][0];
1210                     bits=bits*2+sign; len++;
1211
1212                     if(code!=rl->n && len < len_tab[index]){
1213                         bits_tab[index]= bits;
1214                         len_tab [index]= len;
1215                     }
1216                 }
1217                 /* ESC2 */
1218                 bits= rl->table_vlc[rl->n][0];
1219                 len=  rl->table_vlc[rl->n][1];
1220                 bits=bits*4+2;    len+=2; //esc2
1221                 run1 = run - rl->max_run[last][level] - 1;
1222                 if(run1>=0){
1223                     code= get_rl_index(rl, last, run1, level);
1224                     bits<<= rl->table_vlc[code][1];
1225                     len  += rl->table_vlc[code][1];
1226                     bits += rl->table_vlc[code][0];
1227                     bits=bits*2+sign; len++;
1228
1229                     if(code!=rl->n && len < len_tab[index]){
1230                         bits_tab[index]= bits;
1231                         len_tab [index]= len;
1232                     }
1233                 }
1234                 /* ESC3 */
1235                 bits= rl->table_vlc[rl->n][0];
1236                 len = rl->table_vlc[rl->n][1];
1237                 bits=bits*4+3;    len+=2; //esc3
1238                 bits=bits*2+last; len++;
1239                 bits=bits*64+run; len+=6;
1240                 bits=bits*2+1;    len++;  //marker
1241                 bits=bits*4096+(slevel&0xfff); len+=12;
1242                 bits=bits*2+1;    len++;  //marker
1243
1244                 if(len < len_tab[index]){
1245                     bits_tab[index]= bits;
1246                     len_tab [index]= len;
1247                 }
1248             }
1249         }
1250     }
1251 }
1252
1253 static av_cold int encode_init(AVCodecContext *avctx)
1254 {
1255     MpegEncContext *s = avctx->priv_data;
1256     int ret;
1257     static int done = 0;
1258
1259     if((ret=MPV_encode_init(avctx)) < 0)
1260         return ret;
1261
1262     if (!done) {
1263         done = 1;
1264
1265         init_uni_dc_tab();
1266
1267         init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
1268
1269         init_uni_mpeg4_rl_tab(&ff_mpeg4_rl_intra, uni_mpeg4_intra_rl_bits, uni_mpeg4_intra_rl_len);
1270         init_uni_mpeg4_rl_tab(&ff_h263_rl_inter, uni_mpeg4_inter_rl_bits, uni_mpeg4_inter_rl_len);
1271     }
1272
1273     s->min_qcoeff= -2048;
1274     s->max_qcoeff=  2047;
1275     s->intra_ac_vlc_length     = uni_mpeg4_intra_rl_len;
1276     s->intra_ac_vlc_last_length= uni_mpeg4_intra_rl_len + 128*64;
1277     s->inter_ac_vlc_length     = uni_mpeg4_inter_rl_len;
1278     s->inter_ac_vlc_last_length= uni_mpeg4_inter_rl_len + 128*64;
1279     s->luma_dc_vlc_length= uni_DCtab_lum_len;
1280     s->chroma_dc_vlc_length= uni_DCtab_chrom_len;
1281     s->ac_esc_length= 7+2+1+6+1+12+1;
1282     s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table;
1283     s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
1284
1285     if(s->flags & CODEC_FLAG_GLOBAL_HEADER){
1286
1287         s->avctx->extradata= av_malloc(1024);
1288         init_put_bits(&s->pb, s->avctx->extradata, 1024);
1289
1290         if(!(s->workaround_bugs & FF_BUG_MS))
1291             mpeg4_encode_visual_object_header(s);
1292         mpeg4_encode_vol_header(s, 0, 0);
1293
1294 //            ff_mpeg4_stuffing(&s->pb); ?
1295         flush_put_bits(&s->pb);
1296         s->avctx->extradata_size= (put_bits_count(&s->pb)+7)>>3;
1297     }
1298     return 0;
1299 }
1300
1301 void ff_mpeg4_init_partitions(MpegEncContext *s)
1302 {
1303     uint8_t *start= put_bits_ptr(&s->pb);
1304     uint8_t *end= s->pb.buf_end;
1305     int size= end - start;
1306     int pb_size = (((intptr_t)start + size/3)&(~3)) - (intptr_t)start;
1307     int tex_size= (size - 2*pb_size)&(~3);
1308
1309     set_put_bits_buffer_size(&s->pb, pb_size);
1310     init_put_bits(&s->tex_pb, start + pb_size           , tex_size);
1311     init_put_bits(&s->pb2   , start + pb_size + tex_size, pb_size);
1312 }
1313
1314 void ff_mpeg4_merge_partitions(MpegEncContext *s)
1315 {
1316     const int pb2_len   = put_bits_count(&s->pb2   );
1317     const int tex_pb_len= put_bits_count(&s->tex_pb);
1318     const int bits= put_bits_count(&s->pb);
1319
1320     if(s->pict_type==FF_I_TYPE){
1321         put_bits(&s->pb, 19, DC_MARKER);
1322         s->misc_bits+=19 + pb2_len + bits - s->last_bits;
1323         s->i_tex_bits+= tex_pb_len;
1324     }else{
1325         put_bits(&s->pb, 17, MOTION_MARKER);
1326         s->misc_bits+=17 + pb2_len;
1327         s->mv_bits+= bits - s->last_bits;
1328         s->p_tex_bits+= tex_pb_len;
1329     }
1330
1331     flush_put_bits(&s->pb2);
1332     flush_put_bits(&s->tex_pb);
1333
1334     set_put_bits_buffer_size(&s->pb, s->pb2.buf_end - s->pb.buf);
1335     ff_copy_bits(&s->pb, s->pb2.buf   , pb2_len);
1336     ff_copy_bits(&s->pb, s->tex_pb.buf, tex_pb_len);
1337     s->last_bits= put_bits_count(&s->pb);
1338 }
1339
1340
1341 void ff_mpeg4_encode_video_packet_header(MpegEncContext *s)
1342 {
1343     int mb_num_bits= av_log2(s->mb_num - 1) + 1;
1344
1345     put_bits(&s->pb, ff_mpeg4_get_video_packet_prefix_length(s), 0);
1346     put_bits(&s->pb, 1, 1);
1347
1348     put_bits(&s->pb, mb_num_bits, s->mb_x + s->mb_y*s->mb_width);
1349     put_bits(&s->pb, s->quant_precision, s->qscale);
1350     put_bits(&s->pb, 1, 0); /* no HEC */
1351 }
1352
1353 AVCodec ff_mpeg4_encoder = {
1354     "mpeg4",
1355     AVMEDIA_TYPE_VIDEO,
1356     CODEC_ID_MPEG4,
1357     sizeof(MpegEncContext),
1358     encode_init,
1359     MPV_encode_picture,
1360     MPV_encode_end,
1361     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
1362     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
1363     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
1364 };