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libavcodec/mpeg4videoenc.c

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00001 /*
00002  * MPEG4 encoder.
00003  * Copyright (c) 2000,2001 Fabrice Bellard
00004  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
00005  *
00006  * This file is part of Libav.
00007  *
00008  * Libav is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * Libav is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with Libav; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 #include "libavutil/log.h"
00024 #include "libavutil/opt.h"
00025 #include "mpegvideo.h"
00026 #include "h263.h"
00027 #include "mpeg4video.h"
00028 
00029 //The uni_DCtab_* tables below contain unified bits+length tables to encode DC
00030 //differences in mpeg4. Unified in the sense that the specification specifies
00031 //this encoding in several steps.
00032 static uint8_t uni_DCtab_lum_len[512];
00033 static uint8_t uni_DCtab_chrom_len[512];
00034 static uint16_t uni_DCtab_lum_bits[512];
00035 static uint16_t uni_DCtab_chrom_bits[512];
00036 
00037 //unified encoding tables for run length encoding of coefficients
00038 //unified in the sense that the specification specifies the encoding in several steps.
00039 static uint32_t uni_mpeg4_intra_rl_bits[64*64*2*2];
00040 static uint8_t  uni_mpeg4_intra_rl_len [64*64*2*2];
00041 static uint32_t uni_mpeg4_inter_rl_bits[64*64*2*2];
00042 static uint8_t  uni_mpeg4_inter_rl_len [64*64*2*2];
00043 //#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128 + (run)*256 + (level))
00044 //#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run) + (level)*64)
00045 #define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run)*128 + (level))
00046 
00047 /* mpeg4
00048 inter
00049 max level: 24/6
00050 max run: 53/63
00051 
00052 intra
00053 max level: 53/16
00054 max run: 29/41
00055 */
00056 
00057 
00062 static inline int get_block_rate(MpegEncContext * s, DCTELEM block[64], int block_last_index, uint8_t scantable[64]){
00063     int last=0;
00064     int j;
00065     int rate=0;
00066 
00067     for(j=1; j<=block_last_index; j++){
00068         const int index= scantable[j];
00069         int level= block[index];
00070         if(level){
00071             level+= 64;
00072             if((level&(~127)) == 0){
00073                 if(j<block_last_index) rate+= s->intra_ac_vlc_length     [UNI_AC_ENC_INDEX(j-last-1, level)];
00074                 else                   rate+= s->intra_ac_vlc_last_length[UNI_AC_ENC_INDEX(j-last-1, level)];
00075             }else
00076                 rate += s->ac_esc_length;
00077 
00078             last= j;
00079         }
00080     }
00081 
00082     return rate;
00083 }
00084 
00085 
00094 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])
00095 {
00096     int i, n;
00097     memcpy(s->block_last_index, zigzag_last_index, sizeof(int)*6);
00098 
00099     for(n=0; n<6; n++){
00100         int16_t *ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
00101 
00102         st[n]= s->intra_scantable.permutated;
00103         if(dir[n]){
00104             /* top prediction */
00105             for(i=1; i<8; i++){
00106                 block[n][s->dsp.idct_permutation[i   ]] = ac_val[i+8];
00107             }
00108         }else{
00109             /* left prediction */
00110             for(i=1; i<8; i++){
00111                 block[n][s->dsp.idct_permutation[i<<3]]= ac_val[i  ];
00112             }
00113         }
00114     }
00115 }
00116 
00125 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])
00126 {
00127     int score= 0;
00128     int i, n;
00129     int8_t * const qscale_table = s->current_picture.f.qscale_table;
00130 
00131     memcpy(zigzag_last_index, s->block_last_index, sizeof(int)*6);
00132 
00133     for(n=0; n<6; n++){
00134         int16_t *ac_val, *ac_val1;
00135 
00136         score -= get_block_rate(s, block[n], s->block_last_index[n], s->intra_scantable.permutated);
00137 
00138         ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
00139         ac_val1= ac_val;
00140         if(dir[n]){
00141             const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
00142             /* top prediction */
00143             ac_val-= s->block_wrap[n]*16;
00144             if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
00145                 /* same qscale */
00146                 for(i=1; i<8; i++){
00147                     const int level= block[n][s->dsp.idct_permutation[i   ]];
00148                     block[n][s->dsp.idct_permutation[i   ]] = level - ac_val[i+8];
00149                     ac_val1[i  ]=    block[n][s->dsp.idct_permutation[i<<3]];
00150                     ac_val1[i+8]= level;
00151                 }
00152             }else{
00153                 /* different qscale, we must rescale */
00154                 for(i=1; i<8; i++){
00155                     const int level= block[n][s->dsp.idct_permutation[i   ]];
00156                     block[n][s->dsp.idct_permutation[i   ]] = level - ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
00157                     ac_val1[i  ]=    block[n][s->dsp.idct_permutation[i<<3]];
00158                     ac_val1[i+8]= level;
00159                 }
00160             }
00161             st[n]= s->intra_h_scantable.permutated;
00162         }else{
00163             const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
00164             /* left prediction */
00165             ac_val-= 16;
00166             if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
00167                 /* same qscale */
00168                 for(i=1; i<8; i++){
00169                     const int level= block[n][s->dsp.idct_permutation[i<<3]];
00170                     block[n][s->dsp.idct_permutation[i<<3]]= level - ac_val[i];
00171                     ac_val1[i  ]= level;
00172                     ac_val1[i+8]=    block[n][s->dsp.idct_permutation[i   ]];
00173                 }
00174             }else{
00175                 /* different qscale, we must rescale */
00176                 for(i=1; i<8; i++){
00177                     const int level= block[n][s->dsp.idct_permutation[i<<3]];
00178                     block[n][s->dsp.idct_permutation[i<<3]]= level - ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
00179                     ac_val1[i  ]= level;
00180                     ac_val1[i+8]=    block[n][s->dsp.idct_permutation[i   ]];
00181                 }
00182             }
00183             st[n]= s->intra_v_scantable.permutated;
00184         }
00185 
00186         for(i=63; i>0; i--) //FIXME optimize
00187             if(block[n][ st[n][i] ]) break;
00188         s->block_last_index[n]= i;
00189 
00190         score += get_block_rate(s, block[n], s->block_last_index[n], st[n]);
00191     }
00192 
00193     if(score < 0){
00194         return 1;
00195     }else{
00196         restore_ac_coeffs(s, block, dir, st, zigzag_last_index);
00197         return 0;
00198     }
00199 }
00200 
00204 void ff_clean_mpeg4_qscales(MpegEncContext *s){
00205     int i;
00206     int8_t * const qscale_table = s->current_picture.f.qscale_table;
00207 
00208     ff_clean_h263_qscales(s);
00209 
00210     if(s->pict_type== AV_PICTURE_TYPE_B){
00211         int odd=0;
00212         /* ok, come on, this isn't funny anymore, there's more code for handling this mpeg4 mess than for the actual adaptive quantization */
00213 
00214         for(i=0; i<s->mb_num; i++){
00215             int mb_xy= s->mb_index2xy[i];
00216             odd += qscale_table[mb_xy]&1;
00217         }
00218 
00219         if(2*odd > s->mb_num) odd=1;
00220         else                  odd=0;
00221 
00222         for(i=0; i<s->mb_num; i++){
00223             int mb_xy= s->mb_index2xy[i];
00224             if((qscale_table[mb_xy]&1) != odd)
00225                 qscale_table[mb_xy]++;
00226             if(qscale_table[mb_xy] > 31)
00227                 qscale_table[mb_xy]= 31;
00228         }
00229 
00230         for(i=1; i<s->mb_num; i++){
00231             int mb_xy= s->mb_index2xy[i];
00232             if(qscale_table[mb_xy] != qscale_table[s->mb_index2xy[i-1]] && (s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_DIRECT)){
00233                 s->mb_type[mb_xy]|= CANDIDATE_MB_TYPE_BIDIR;
00234             }
00235         }
00236     }
00237 }
00238 
00239 
00244 static inline void mpeg4_encode_dc(PutBitContext * s, int level, int n)
00245 {
00246 #if 1
00247     /* DC will overflow if level is outside the [-255,255] range. */
00248     level+=256;
00249     if (n < 4) {
00250         /* luminance */
00251         put_bits(s, uni_DCtab_lum_len[level], uni_DCtab_lum_bits[level]);
00252     } else {
00253         /* chrominance */
00254         put_bits(s, uni_DCtab_chrom_len[level], uni_DCtab_chrom_bits[level]);
00255     }
00256 #else
00257     int size, v;
00258     /* find number of bits */
00259     size = 0;
00260     v = abs(level);
00261     while (v) {
00262         v >>= 1;
00263         size++;
00264     }
00265 
00266     if (n < 4) {
00267         /* luminance */
00268         put_bits(&s->pb, ff_mpeg4_DCtab_lum[size][1], ff_mpeg4_DCtab_lum[size][0]);
00269     } else {
00270         /* chrominance */
00271         put_bits(&s->pb, ff_mpeg4_DCtab_chrom[size][1], ff_mpeg4_DCtab_chrom[size][0]);
00272     }
00273 
00274     /* encode remaining bits */
00275     if (size > 0) {
00276         if (level < 0)
00277             level = (-level) ^ ((1 << size) - 1);
00278         put_bits(&s->pb, size, level);
00279         if (size > 8)
00280             put_bits(&s->pb, 1, 1);
00281     }
00282 #endif
00283 }
00284 
00285 static inline int mpeg4_get_dc_length(int level, int n){
00286     if (n < 4) {
00287         return uni_DCtab_lum_len[level + 256];
00288     } else {
00289         return uni_DCtab_chrom_len[level + 256];
00290     }
00291 }
00292 
00297 static inline void mpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n, int intra_dc,
00298                                uint8_t *scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb)
00299 {
00300     int i, last_non_zero;
00301     uint32_t *bits_tab;
00302     uint8_t *len_tab;
00303     const int last_index = s->block_last_index[n];
00304 
00305     if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
00306         /* mpeg4 based DC predictor */
00307         mpeg4_encode_dc(dc_pb, intra_dc, n);
00308         if(last_index<1) return;
00309         i = 1;
00310         bits_tab= uni_mpeg4_intra_rl_bits;
00311         len_tab = uni_mpeg4_intra_rl_len;
00312     } else {
00313         if(last_index<0) return;
00314         i = 0;
00315         bits_tab= uni_mpeg4_inter_rl_bits;
00316         len_tab = uni_mpeg4_inter_rl_len;
00317     }
00318 
00319     /* AC coefs */
00320     last_non_zero = i - 1;
00321     for (; i < last_index; i++) {
00322         int level = block[ scan_table[i] ];
00323         if (level) {
00324             int run = i - last_non_zero - 1;
00325             level+=64;
00326             if((level&(~127)) == 0){
00327                 const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
00328                 put_bits(ac_pb, len_tab[index], bits_tab[index]);
00329             }else{ //ESC3
00330                 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);
00331             }
00332             last_non_zero = i;
00333         }
00334     }
00335     /*if(i<=last_index)*/{
00336         int level = block[ scan_table[i] ];
00337         int run = i - last_non_zero - 1;
00338         level+=64;
00339         if((level&(~127)) == 0){
00340             const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
00341             put_bits(ac_pb, len_tab[index], bits_tab[index]);
00342         }else{ //ESC3
00343             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);
00344         }
00345     }
00346 }
00347 
00348 static int mpeg4_get_block_length(MpegEncContext * s, DCTELEM * block, int n, int intra_dc,
00349                                uint8_t *scan_table)
00350 {
00351     int i, last_non_zero;
00352     uint8_t *len_tab;
00353     const int last_index = s->block_last_index[n];
00354     int len=0;
00355 
00356     if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
00357         /* mpeg4 based DC predictor */
00358         len += mpeg4_get_dc_length(intra_dc, n);
00359         if(last_index<1) return len;
00360         i = 1;
00361         len_tab = uni_mpeg4_intra_rl_len;
00362     } else {
00363         if(last_index<0) return 0;
00364         i = 0;
00365         len_tab = uni_mpeg4_inter_rl_len;
00366     }
00367 
00368     /* AC coefs */
00369     last_non_zero = i - 1;
00370     for (; i < last_index; i++) {
00371         int level = block[ scan_table[i] ];
00372         if (level) {
00373             int run = i - last_non_zero - 1;
00374             level+=64;
00375             if((level&(~127)) == 0){
00376                 const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
00377                 len += len_tab[index];
00378             }else{ //ESC3
00379                 len += 7+2+1+6+1+12+1;
00380             }
00381             last_non_zero = i;
00382         }
00383     }
00384     /*if(i<=last_index)*/{
00385         int level = block[ scan_table[i] ];
00386         int run = i - last_non_zero - 1;
00387         level+=64;
00388         if((level&(~127)) == 0){
00389             const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
00390             len += len_tab[index];
00391         }else{ //ESC3
00392             len += 7+2+1+6+1+12+1;
00393         }
00394     }
00395 
00396     return len;
00397 }
00398 
00399 static inline void mpeg4_encode_blocks(MpegEncContext * s, DCTELEM block[6][64], int intra_dc[6],
00400                                uint8_t **scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb){
00401     int i;
00402 
00403     if(scan_table){
00404         if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
00405             for (i = 0; i < 6; i++) {
00406                 skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, intra_dc[i], scan_table[i]));
00407             }
00408         }else{
00409             /* encode each block */
00410             for (i = 0; i < 6; i++) {
00411                 mpeg4_encode_block(s, block[i], i, intra_dc[i], scan_table[i], dc_pb, ac_pb);
00412             }
00413         }
00414     }else{
00415         if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
00416             for (i = 0; i < 6; i++) {
00417                 skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, 0, s->intra_scantable.permutated));
00418             }
00419         }else{
00420             /* encode each block */
00421             for (i = 0; i < 6; i++) {
00422                 mpeg4_encode_block(s, block[i], i, 0, s->intra_scantable.permutated, dc_pb, ac_pb);
00423             }
00424         }
00425     }
00426 }
00427 
00428 static inline int get_b_cbp(MpegEncContext * s, DCTELEM block[6][64],
00429                             int motion_x, int motion_y, int mb_type)
00430 {
00431     int cbp = 0, i;
00432 
00433     if (s->flags & CODEC_FLAG_CBP_RD) {
00434         int score = 0;
00435         const int lambda = s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
00436 
00437         for (i = 0; i < 6; i++)
00438             if (s->coded_score[i] < 0) {
00439                 score += s->coded_score[i];
00440                 cbp   |= 1 << (5 - i);
00441             }
00442 
00443         if (cbp) {
00444             int zero_score = -6;
00445             if ((motion_x | motion_y | s->dquant | mb_type) == 0)
00446                 zero_score -= 4; //2*MV + mb_type + cbp bit
00447 
00448             zero_score *= lambda;
00449             if (zero_score <= score)
00450                 cbp = 0;
00451         }
00452 
00453         for (i = 0; i < 6; i++) {
00454             if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i)) & 1) == 0) {
00455                 s->block_last_index[i] = -1;
00456                 s->dsp.clear_block(s->block[i]);
00457             }
00458         }
00459     } else {
00460         for (i = 0; i < 6; i++) {
00461             if (s->block_last_index[i] >= 0)
00462                 cbp |= 1 << (5 - i);
00463         }
00464     }
00465     return cbp;
00466 }
00467 
00468 //FIXME this is duplicated to h263.c
00469 static const int dquant_code[5]= {1,0,9,2,3};
00470 
00471 void mpeg4_encode_mb(MpegEncContext * s,
00472                     DCTELEM block[6][64],
00473                     int motion_x, int motion_y)
00474 {
00475     int cbpc, cbpy, pred_x, pred_y;
00476     PutBitContext * const pb2    = s->data_partitioning                         ? &s->pb2    : &s->pb;
00477     PutBitContext * const tex_pb = s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B ? &s->tex_pb : &s->pb;
00478     PutBitContext * const dc_pb  = s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_I ? &s->pb2    : &s->pb;
00479     const int interleaved_stats= (s->flags&CODEC_FLAG_PASS1) && !s->data_partitioning ? 1 : 0;
00480 
00481     if (!s->mb_intra) {
00482         int i, cbp;
00483 
00484         if(s->pict_type==AV_PICTURE_TYPE_B){
00485             static const int mb_type_table[8]= {-1, 3, 2, 1,-1,-1,-1, 0}; /* convert from mv_dir to type */
00486             int mb_type=  mb_type_table[s->mv_dir];
00487 
00488             if(s->mb_x==0){
00489                 for(i=0; i<2; i++){
00490                     s->last_mv[i][0][0]=
00491                     s->last_mv[i][0][1]=
00492                     s->last_mv[i][1][0]=
00493                     s->last_mv[i][1][1]= 0;
00494                 }
00495             }
00496 
00497             assert(s->dquant>=-2 && s->dquant<=2);
00498             assert((s->dquant&1)==0);
00499             assert(mb_type>=0);
00500 
00501             /* nothing to do if this MB was skipped in the next P Frame */
00502             if (s->next_picture.f.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]) { //FIXME avoid DCT & ...
00503                 s->skip_count++;
00504                 s->mv[0][0][0]=
00505                 s->mv[0][0][1]=
00506                 s->mv[1][0][0]=
00507                 s->mv[1][0][1]= 0;
00508                 s->mv_dir= MV_DIR_FORWARD; //doesn't matter
00509                 s->qscale -= s->dquant;
00510 //                s->mb_skipped=1;
00511 
00512                 return;
00513             }
00514 
00515             cbp= get_b_cbp(s, block, motion_x, motion_y, mb_type);
00516 
00517             if ((cbp | motion_x | motion_y | mb_type) ==0) {
00518                 /* direct MB with MV={0,0} */
00519                 assert(s->dquant==0);
00520 
00521                 put_bits(&s->pb, 1, 1); /* mb not coded modb1=1 */
00522 
00523                 if(interleaved_stats){
00524                     s->misc_bits++;
00525                     s->last_bits++;
00526                 }
00527                 s->skip_count++;
00528                 return;
00529             }
00530 
00531             put_bits(&s->pb, 1, 0);     /* mb coded modb1=0 */
00532             put_bits(&s->pb, 1, cbp ? 0 : 1); /* modb2 */ //FIXME merge
00533             put_bits(&s->pb, mb_type+1, 1); // this table is so simple that we don't need it :)
00534             if(cbp) put_bits(&s->pb, 6, cbp);
00535 
00536             if(cbp && mb_type){
00537                 if(s->dquant)
00538                     put_bits(&s->pb, 2, (s->dquant>>2)+3);
00539                 else
00540                     put_bits(&s->pb, 1, 0);
00541             }else
00542                 s->qscale -= s->dquant;
00543 
00544             if(!s->progressive_sequence){
00545                 if(cbp)
00546                     put_bits(&s->pb, 1, s->interlaced_dct);
00547                 if(mb_type) // not direct mode
00548                     put_bits(&s->pb, 1, s->mv_type == MV_TYPE_FIELD);
00549             }
00550 
00551             if(interleaved_stats){
00552                 s->misc_bits+= get_bits_diff(s);
00553             }
00554 
00555             if(mb_type == 0){
00556                 assert(s->mv_dir & MV_DIRECT);
00557                 ff_h263_encode_motion_vector(s, motion_x, motion_y, 1);
00558                 s->b_count++;
00559                 s->f_count++;
00560             }else{
00561                 assert(mb_type > 0 && mb_type < 4);
00562                 if(s->mv_type != MV_TYPE_FIELD){
00563                     if(s->mv_dir & MV_DIR_FORWARD){
00564                         ff_h263_encode_motion_vector(s, s->mv[0][0][0] - s->last_mv[0][0][0],
00565                                                         s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
00566                         s->last_mv[0][0][0]= s->last_mv[0][1][0]= s->mv[0][0][0];
00567                         s->last_mv[0][0][1]= s->last_mv[0][1][1]= s->mv[0][0][1];
00568                         s->f_count++;
00569                     }
00570                     if(s->mv_dir & MV_DIR_BACKWARD){
00571                         ff_h263_encode_motion_vector(s, s->mv[1][0][0] - s->last_mv[1][0][0],
00572                                                         s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
00573                         s->last_mv[1][0][0]= s->last_mv[1][1][0]= s->mv[1][0][0];
00574                         s->last_mv[1][0][1]= s->last_mv[1][1][1]= s->mv[1][0][1];
00575                         s->b_count++;
00576                     }
00577                 }else{
00578                     if(s->mv_dir & MV_DIR_FORWARD){
00579                         put_bits(&s->pb, 1, s->field_select[0][0]);
00580                         put_bits(&s->pb, 1, s->field_select[0][1]);
00581                     }
00582                     if(s->mv_dir & MV_DIR_BACKWARD){
00583                         put_bits(&s->pb, 1, s->field_select[1][0]);
00584                         put_bits(&s->pb, 1, s->field_select[1][1]);
00585                     }
00586                     if(s->mv_dir & MV_DIR_FORWARD){
00587                         for(i=0; i<2; i++){
00588                             ff_h263_encode_motion_vector(s, s->mv[0][i][0] - s->last_mv[0][i][0]  ,
00589                                                             s->mv[0][i][1] - s->last_mv[0][i][1]/2, s->f_code);
00590                             s->last_mv[0][i][0]= s->mv[0][i][0];
00591                             s->last_mv[0][i][1]= s->mv[0][i][1]*2;
00592                         }
00593                         s->f_count++;
00594                     }
00595                     if(s->mv_dir & MV_DIR_BACKWARD){
00596                         for(i=0; i<2; i++){
00597                             ff_h263_encode_motion_vector(s, s->mv[1][i][0] - s->last_mv[1][i][0]  ,
00598                                                             s->mv[1][i][1] - s->last_mv[1][i][1]/2, s->b_code);
00599                             s->last_mv[1][i][0]= s->mv[1][i][0];
00600                             s->last_mv[1][i][1]= s->mv[1][i][1]*2;
00601                         }
00602                         s->b_count++;
00603                     }
00604                 }
00605             }
00606 
00607             if(interleaved_stats){
00608                 s->mv_bits+= get_bits_diff(s);
00609             }
00610 
00611             mpeg4_encode_blocks(s, block, NULL, NULL, NULL, &s->pb);
00612 
00613             if(interleaved_stats){
00614                 s->p_tex_bits+= get_bits_diff(s);
00615             }
00616 
00617         }else{ /* s->pict_type==AV_PICTURE_TYPE_B */
00618             cbp= get_p_cbp(s, block, motion_x, motion_y);
00619 
00620             if ((cbp | motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16) {
00621                 /* check if the B frames can skip it too, as we must skip it if we skip here
00622                    why didn't they just compress the skip-mb bits instead of reusing them ?! */
00623                 if(s->max_b_frames>0){
00624                     int i;
00625                     int x,y, offset;
00626                     uint8_t *p_pic;
00627 
00628                     x= s->mb_x*16;
00629                     y= s->mb_y*16;
00630                     if(x+16 > s->width)  x= s->width-16;
00631                     if(y+16 > s->height) y= s->height-16;
00632 
00633                     offset= x + y*s->linesize;
00634                     p_pic = s->new_picture.f.data[0] + offset;
00635 
00636                     s->mb_skipped=1;
00637                     for(i=0; i<s->max_b_frames; i++){
00638                         uint8_t *b_pic;
00639                         int diff;
00640                         Picture *pic= s->reordered_input_picture[i+1];
00641 
00642                         if (pic == NULL || pic->f.pict_type != AV_PICTURE_TYPE_B)
00643                             break;
00644 
00645                         b_pic = pic->f.data[0] + offset;
00646                         if (pic->f.type != FF_BUFFER_TYPE_SHARED)
00647                             b_pic+= INPLACE_OFFSET;
00648                         diff= s->dsp.sad[0](NULL, p_pic, b_pic, s->linesize, 16);
00649                         if(diff>s->qscale*70){ //FIXME check that 70 is optimal
00650                             s->mb_skipped=0;
00651                             break;
00652                         }
00653                     }
00654                 }else
00655                     s->mb_skipped=1;
00656 
00657                 if(s->mb_skipped==1){
00658                     /* skip macroblock */
00659                     put_bits(&s->pb, 1, 1);
00660 
00661                     if(interleaved_stats){
00662                         s->misc_bits++;
00663                         s->last_bits++;
00664                     }
00665                     s->skip_count++;
00666 
00667                     return;
00668                 }
00669             }
00670 
00671             put_bits(&s->pb, 1, 0);     /* mb coded */
00672             cbpc = cbp & 3;
00673             cbpy = cbp >> 2;
00674             cbpy ^= 0xf;
00675             if(s->mv_type==MV_TYPE_16X16){
00676                 if(s->dquant) cbpc+= 8;
00677                 put_bits(&s->pb,
00678                         ff_h263_inter_MCBPC_bits[cbpc],
00679                         ff_h263_inter_MCBPC_code[cbpc]);
00680 
00681                 put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
00682                 if(s->dquant)
00683                     put_bits(pb2, 2, dquant_code[s->dquant+2]);
00684 
00685                 if(!s->progressive_sequence){
00686                     if(cbp)
00687                         put_bits(pb2, 1, s->interlaced_dct);
00688                     put_bits(pb2, 1, 0);
00689                 }
00690 
00691                 if(interleaved_stats){
00692                     s->misc_bits+= get_bits_diff(s);
00693                 }
00694 
00695                 /* motion vectors: 16x16 mode */
00696                 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
00697 
00698                 ff_h263_encode_motion_vector(s, motion_x - pred_x,
00699                                                 motion_y - pred_y, s->f_code);
00700             }else if(s->mv_type==MV_TYPE_FIELD){
00701                 if(s->dquant) cbpc+= 8;
00702                 put_bits(&s->pb,
00703                         ff_h263_inter_MCBPC_bits[cbpc],
00704                         ff_h263_inter_MCBPC_code[cbpc]);
00705 
00706                 put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
00707                 if(s->dquant)
00708                     put_bits(pb2, 2, dquant_code[s->dquant+2]);
00709 
00710                 assert(!s->progressive_sequence);
00711                 if(cbp)
00712                     put_bits(pb2, 1, s->interlaced_dct);
00713                 put_bits(pb2, 1, 1);
00714 
00715                 if(interleaved_stats){
00716                     s->misc_bits+= get_bits_diff(s);
00717                 }
00718 
00719                 /* motion vectors: 16x8 interlaced mode */
00720                 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
00721                 pred_y /=2;
00722 
00723                 put_bits(&s->pb, 1, s->field_select[0][0]);
00724                 put_bits(&s->pb, 1, s->field_select[0][1]);
00725 
00726                 ff_h263_encode_motion_vector(s, s->mv[0][0][0] - pred_x,
00727                                                 s->mv[0][0][1] - pred_y, s->f_code);
00728                 ff_h263_encode_motion_vector(s, s->mv[0][1][0] - pred_x,
00729                                                 s->mv[0][1][1] - pred_y, s->f_code);
00730             }else{
00731                 assert(s->mv_type==MV_TYPE_8X8);
00732                 put_bits(&s->pb,
00733                         ff_h263_inter_MCBPC_bits[cbpc+16],
00734                         ff_h263_inter_MCBPC_code[cbpc+16]);
00735                 put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
00736 
00737                 if(!s->progressive_sequence){
00738                     if(cbp)
00739                         put_bits(pb2, 1, s->interlaced_dct);
00740                 }
00741 
00742                 if(interleaved_stats){
00743                     s->misc_bits+= get_bits_diff(s);
00744                 }
00745 
00746                 for(i=0; i<4; i++){
00747                     /* motion vectors: 8x8 mode*/
00748                     ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
00749 
00750                     ff_h263_encode_motion_vector(s, s->current_picture.f.motion_val[0][ s->block_index[i] ][0] - pred_x,
00751                                                     s->current_picture.f.motion_val[0][ s->block_index[i] ][1] - pred_y, s->f_code);
00752                 }
00753             }
00754 
00755             if(interleaved_stats){
00756                 s->mv_bits+= get_bits_diff(s);
00757             }
00758 
00759             mpeg4_encode_blocks(s, block, NULL, NULL, NULL, tex_pb);
00760 
00761             if(interleaved_stats){
00762                 s->p_tex_bits+= get_bits_diff(s);
00763             }
00764             s->f_count++;
00765         }
00766     } else {
00767         int cbp;
00768         int dc_diff[6];   //dc values with the dc prediction subtracted
00769         int dir[6];  //prediction direction
00770         int zigzag_last_index[6];
00771         uint8_t *scan_table[6];
00772         int i;
00773 
00774         for(i=0; i<6; i++){
00775             dc_diff[i]= ff_mpeg4_pred_dc(s, i, block[i][0], &dir[i], 1);
00776         }
00777 
00778         if(s->flags & CODEC_FLAG_AC_PRED){
00779             s->ac_pred= decide_ac_pred(s, block, dir, scan_table, zigzag_last_index);
00780         }else{
00781             for(i=0; i<6; i++)
00782                 scan_table[i]= s->intra_scantable.permutated;
00783         }
00784 
00785         /* compute cbp */
00786         cbp = 0;
00787         for (i = 0; i < 6; i++) {
00788             if (s->block_last_index[i] >= 1)
00789                 cbp |= 1 << (5 - i);
00790         }
00791 
00792         cbpc = cbp & 3;
00793         if (s->pict_type == AV_PICTURE_TYPE_I) {
00794             if(s->dquant) cbpc+=4;
00795             put_bits(&s->pb,
00796                 ff_h263_intra_MCBPC_bits[cbpc],
00797                 ff_h263_intra_MCBPC_code[cbpc]);
00798         } else {
00799             if(s->dquant) cbpc+=8;
00800             put_bits(&s->pb, 1, 0);     /* mb coded */
00801             put_bits(&s->pb,
00802                 ff_h263_inter_MCBPC_bits[cbpc + 4],
00803                 ff_h263_inter_MCBPC_code[cbpc + 4]);
00804         }
00805         put_bits(pb2, 1, s->ac_pred);
00806         cbpy = cbp >> 2;
00807         put_bits(pb2, ff_h263_cbpy_tab[cbpy][1], ff_h263_cbpy_tab[cbpy][0]);
00808         if(s->dquant)
00809             put_bits(dc_pb, 2, dquant_code[s->dquant+2]);
00810 
00811         if(!s->progressive_sequence){
00812             put_bits(dc_pb, 1, s->interlaced_dct);
00813         }
00814 
00815         if(interleaved_stats){
00816             s->misc_bits+= get_bits_diff(s);
00817         }
00818 
00819         mpeg4_encode_blocks(s, block, dc_diff, scan_table, dc_pb, tex_pb);
00820 
00821         if(interleaved_stats){
00822             s->i_tex_bits+= get_bits_diff(s);
00823         }
00824         s->i_count++;
00825 
00826         /* restore ac coeffs & last_index stuff if we messed them up with the prediction */
00827         if(s->ac_pred)
00828             restore_ac_coeffs(s, block, dir, scan_table, zigzag_last_index);
00829     }
00830 }
00831 
00835 void ff_mpeg4_stuffing(PutBitContext * pbc)
00836 {
00837     int length;
00838     put_bits(pbc, 1, 0);
00839     length= (-put_bits_count(pbc))&7;
00840     if(length) put_bits(pbc, length, (1<<length)-1);
00841 }
00842 
00843 /* must be called before writing the header */
00844 void ff_set_mpeg4_time(MpegEncContext * s){
00845     if(s->pict_type==AV_PICTURE_TYPE_B){
00846         ff_mpeg4_init_direct_mv(s);
00847     }else{
00848         s->last_time_base= s->time_base;
00849         s->time_base= s->time/s->avctx->time_base.den;
00850     }
00851 }
00852 
00853 static void mpeg4_encode_gop_header(MpegEncContext * s){
00854     int hours, minutes, seconds;
00855     int64_t time;
00856 
00857     put_bits(&s->pb, 16, 0);
00858     put_bits(&s->pb, 16, GOP_STARTCODE);
00859 
00860     time = s->current_picture_ptr->f.pts;
00861     if(s->reordered_input_picture[1])
00862         time = FFMIN(time, s->reordered_input_picture[1]->f.pts);
00863     time= time*s->avctx->time_base.num;
00864 
00865     seconds= time/s->avctx->time_base.den;
00866     minutes= seconds/60; seconds %= 60;
00867     hours= minutes/60; minutes %= 60;
00868     hours%=24;
00869 
00870     put_bits(&s->pb, 5, hours);
00871     put_bits(&s->pb, 6, minutes);
00872     put_bits(&s->pb, 1, 1);
00873     put_bits(&s->pb, 6, seconds);
00874 
00875     put_bits(&s->pb, 1, !!(s->flags&CODEC_FLAG_CLOSED_GOP));
00876     put_bits(&s->pb, 1, 0); //broken link == NO
00877 
00878     s->last_time_base= time / s->avctx->time_base.den;
00879 
00880     ff_mpeg4_stuffing(&s->pb);
00881 }
00882 
00883 static void mpeg4_encode_visual_object_header(MpegEncContext * s){
00884     int profile_and_level_indication;
00885     int vo_ver_id;
00886 
00887     if(s->avctx->profile != FF_PROFILE_UNKNOWN){
00888         profile_and_level_indication = s->avctx->profile << 4;
00889     }else if(s->max_b_frames || s->quarter_sample){
00890         profile_and_level_indication= 0xF0; // adv simple
00891     }else{
00892         profile_and_level_indication= 0x00; // simple
00893     }
00894 
00895     if(s->avctx->level != FF_LEVEL_UNKNOWN){
00896         profile_and_level_indication |= s->avctx->level;
00897     }else{
00898         profile_and_level_indication |= 1; //level 1
00899     }
00900 
00901     if(profile_and_level_indication>>4 == 0xF){
00902         vo_ver_id= 5;
00903     }else{
00904         vo_ver_id= 1;
00905     }
00906 
00907     //FIXME levels
00908 
00909     put_bits(&s->pb, 16, 0);
00910     put_bits(&s->pb, 16, VOS_STARTCODE);
00911 
00912     put_bits(&s->pb, 8, profile_and_level_indication);
00913 
00914     put_bits(&s->pb, 16, 0);
00915     put_bits(&s->pb, 16, VISUAL_OBJ_STARTCODE);
00916 
00917     put_bits(&s->pb, 1, 1);
00918         put_bits(&s->pb, 4, vo_ver_id);
00919         put_bits(&s->pb, 3, 1); //priority
00920 
00921     put_bits(&s->pb, 4, 1); //visual obj type== video obj
00922 
00923     put_bits(&s->pb, 1, 0); //video signal type == no clue //FIXME
00924 
00925     ff_mpeg4_stuffing(&s->pb);
00926 }
00927 
00928 static void mpeg4_encode_vol_header(MpegEncContext * s, int vo_number, int vol_number)
00929 {
00930     int vo_ver_id;
00931 
00932     if (!CONFIG_MPEG4_ENCODER)  return;
00933 
00934     if(s->max_b_frames || s->quarter_sample){
00935         vo_ver_id= 5;
00936         s->vo_type= ADV_SIMPLE_VO_TYPE;
00937     }else{
00938         vo_ver_id= 1;
00939         s->vo_type= SIMPLE_VO_TYPE;
00940     }
00941 
00942     put_bits(&s->pb, 16, 0);
00943     put_bits(&s->pb, 16, 0x100 + vo_number);        /* video obj */
00944     put_bits(&s->pb, 16, 0);
00945     put_bits(&s->pb, 16, 0x120 + vol_number);       /* video obj layer */
00946 
00947     put_bits(&s->pb, 1, 0);             /* random access vol */
00948     put_bits(&s->pb, 8, s->vo_type);    /* video obj type indication */
00949     if(s->workaround_bugs & FF_BUG_MS) {
00950         put_bits(&s->pb, 1, 0);         /* is obj layer id= no */
00951     } else {
00952         put_bits(&s->pb, 1, 1);         /* is obj layer id= yes */
00953         put_bits(&s->pb, 4, vo_ver_id); /* is obj layer ver id */
00954         put_bits(&s->pb, 3, 1);         /* is obj layer priority */
00955     }
00956 
00957     s->aspect_ratio_info= ff_h263_aspect_to_info(s->avctx->sample_aspect_ratio);
00958 
00959     put_bits(&s->pb, 4, s->aspect_ratio_info);/* aspect ratio info */
00960     if (s->aspect_ratio_info == FF_ASPECT_EXTENDED){
00961         put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.num);
00962         put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.den);
00963     }
00964 
00965     if(s->workaround_bugs & FF_BUG_MS) { //
00966         put_bits(&s->pb, 1, 0);         /* vol control parameters= no @@@ */
00967     } else {
00968         put_bits(&s->pb, 1, 1);         /* vol control parameters= yes */
00969         put_bits(&s->pb, 2, 1);         /* chroma format YUV 420/YV12 */
00970         put_bits(&s->pb, 1, s->low_delay);
00971         put_bits(&s->pb, 1, 0);         /* vbv parameters= no */
00972     }
00973 
00974     put_bits(&s->pb, 2, RECT_SHAPE);    /* vol shape= rectangle */
00975     put_bits(&s->pb, 1, 1);             /* marker bit */
00976 
00977     put_bits(&s->pb, 16, s->avctx->time_base.den);
00978     if (s->time_increment_bits < 1)
00979         s->time_increment_bits = 1;
00980     put_bits(&s->pb, 1, 1);             /* marker bit */
00981     put_bits(&s->pb, 1, 0);             /* fixed vop rate=no */
00982     put_bits(&s->pb, 1, 1);             /* marker bit */
00983     put_bits(&s->pb, 13, s->width);     /* vol width */
00984     put_bits(&s->pb, 1, 1);             /* marker bit */
00985     put_bits(&s->pb, 13, s->height);    /* vol height */
00986     put_bits(&s->pb, 1, 1);             /* marker bit */
00987     put_bits(&s->pb, 1, s->progressive_sequence ? 0 : 1);
00988     put_bits(&s->pb, 1, 1);             /* obmc disable */
00989     if (vo_ver_id == 1) {
00990         put_bits(&s->pb, 1, s->vol_sprite_usage);       /* sprite enable */
00991     }else{
00992         put_bits(&s->pb, 2, s->vol_sprite_usage);       /* sprite enable */
00993     }
00994 
00995     put_bits(&s->pb, 1, 0);             /* not 8 bit == false */
00996     put_bits(&s->pb, 1, s->mpeg_quant); /* quant type= (0=h263 style)*/
00997 
00998     if(s->mpeg_quant){
00999         ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
01000         ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
01001     }
01002 
01003     if (vo_ver_id != 1)
01004         put_bits(&s->pb, 1, s->quarter_sample);
01005     put_bits(&s->pb, 1, 1);             /* complexity estimation disable */
01006     s->resync_marker= s->rtp_mode;
01007     put_bits(&s->pb, 1, s->resync_marker ? 0 : 1);/* resync marker disable */
01008     put_bits(&s->pb, 1, s->data_partitioning ? 1 : 0);
01009     if(s->data_partitioning){
01010         put_bits(&s->pb, 1, 0);         /* no rvlc */
01011     }
01012 
01013     if (vo_ver_id != 1){
01014         put_bits(&s->pb, 1, 0);         /* newpred */
01015         put_bits(&s->pb, 1, 0);         /* reduced res vop */
01016     }
01017     put_bits(&s->pb, 1, 0);             /* scalability */
01018 
01019     ff_mpeg4_stuffing(&s->pb);
01020 
01021     /* user data */
01022     if(!(s->flags & CODEC_FLAG_BITEXACT)){
01023         put_bits(&s->pb, 16, 0);
01024         put_bits(&s->pb, 16, 0x1B2);    /* user_data */
01025         ff_put_string(&s->pb, LIBAVCODEC_IDENT, 0);
01026     }
01027 }
01028 
01029 /* write mpeg4 VOP header */
01030 void mpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
01031 {
01032     int time_incr;
01033     int time_div, time_mod;
01034 
01035     if(s->pict_type==AV_PICTURE_TYPE_I){
01036         if(!(s->flags&CODEC_FLAG_GLOBAL_HEADER)){
01037             if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT) //HACK, the reference sw is buggy
01038                 mpeg4_encode_visual_object_header(s);
01039             if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT || picture_number==0) //HACK, the reference sw is buggy
01040                 mpeg4_encode_vol_header(s, 0, 0);
01041         }
01042         if(!(s->workaround_bugs & FF_BUG_MS))
01043             mpeg4_encode_gop_header(s);
01044     }
01045 
01046     s->partitioned_frame= s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B;
01047 
01048     put_bits(&s->pb, 16, 0);                /* vop header */
01049     put_bits(&s->pb, 16, VOP_STARTCODE);    /* vop header */
01050     put_bits(&s->pb, 2, s->pict_type - 1);  /* pict type: I = 0 , P = 1 */
01051 
01052     assert(s->time>=0);
01053     time_div= s->time/s->avctx->time_base.den;
01054     time_mod= s->time%s->avctx->time_base.den;
01055     time_incr= time_div - s->last_time_base;
01056     assert(time_incr >= 0);
01057     while(time_incr--)
01058         put_bits(&s->pb, 1, 1);
01059 
01060     put_bits(&s->pb, 1, 0);
01061 
01062     put_bits(&s->pb, 1, 1);                             /* marker */
01063     put_bits(&s->pb, s->time_increment_bits, time_mod); /* time increment */
01064     put_bits(&s->pb, 1, 1);                             /* marker */
01065     put_bits(&s->pb, 1, 1);                             /* vop coded */
01066     if (    s->pict_type == AV_PICTURE_TYPE_P
01067         || (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE)) {
01068         put_bits(&s->pb, 1, s->no_rounding);    /* rounding type */
01069     }
01070     put_bits(&s->pb, 3, 0);     /* intra dc VLC threshold */
01071     if(!s->progressive_sequence){
01072          put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
01073          put_bits(&s->pb, 1, s->alternate_scan);
01074     }
01075     //FIXME sprite stuff
01076 
01077     put_bits(&s->pb, 5, s->qscale);
01078 
01079     if (s->pict_type != AV_PICTURE_TYPE_I)
01080         put_bits(&s->pb, 3, s->f_code); /* fcode_for */
01081     if (s->pict_type == AV_PICTURE_TYPE_B)
01082         put_bits(&s->pb, 3, s->b_code); /* fcode_back */
01083 }
01084 
01085 
01086 static void init_uni_dc_tab(void)
01087 {
01088     int level, uni_code, uni_len;
01089 
01090     for(level=-256; level<256; level++){
01091         int size, v, l;
01092         /* find number of bits */
01093         size = 0;
01094         v = abs(level);
01095         while (v) {
01096             v >>= 1;
01097             size++;
01098         }
01099 
01100         if (level < 0)
01101             l= (-level) ^ ((1 << size) - 1);
01102         else
01103             l= level;
01104 
01105         /* luminance */
01106         uni_code= ff_mpeg4_DCtab_lum[size][0];
01107         uni_len = ff_mpeg4_DCtab_lum[size][1];
01108 
01109         if (size > 0) {
01110             uni_code<<=size; uni_code|=l;
01111             uni_len+=size;
01112             if (size > 8){
01113                 uni_code<<=1; uni_code|=1;
01114                 uni_len++;
01115             }
01116         }
01117         uni_DCtab_lum_bits[level+256]= uni_code;
01118         uni_DCtab_lum_len [level+256]= uni_len;
01119 
01120         /* chrominance */
01121         uni_code= ff_mpeg4_DCtab_chrom[size][0];
01122         uni_len = ff_mpeg4_DCtab_chrom[size][1];
01123 
01124         if (size > 0) {
01125             uni_code<<=size; uni_code|=l;
01126             uni_len+=size;
01127             if (size > 8){
01128                 uni_code<<=1; uni_code|=1;
01129                 uni_len++;
01130             }
01131         }
01132         uni_DCtab_chrom_bits[level+256]= uni_code;
01133         uni_DCtab_chrom_len [level+256]= uni_len;
01134 
01135     }
01136 }
01137 
01138 static void init_uni_mpeg4_rl_tab(RLTable *rl, uint32_t *bits_tab, uint8_t *len_tab){
01139     int slevel, run, last;
01140 
01141     assert(MAX_LEVEL >= 64);
01142     assert(MAX_RUN   >= 63);
01143 
01144     for(slevel=-64; slevel<64; slevel++){
01145         if(slevel==0) continue;
01146         for(run=0; run<64; run++){
01147             for(last=0; last<=1; last++){
01148                 const int index= UNI_MPEG4_ENC_INDEX(last, run, slevel+64);
01149                 int level= slevel < 0 ? -slevel : slevel;
01150                 int sign= slevel < 0 ? 1 : 0;
01151                 int bits, len, code;
01152                 int level1, run1;
01153 
01154                 len_tab[index]= 100;
01155 
01156                 /* ESC0 */
01157                 code= get_rl_index(rl, last, run, level);
01158                 bits= rl->table_vlc[code][0];
01159                 len=  rl->table_vlc[code][1];
01160                 bits=bits*2+sign; len++;
01161 
01162                 if(code!=rl->n && len < len_tab[index]){
01163                     bits_tab[index]= bits;
01164                     len_tab [index]= len;
01165                 }
01166                 /* ESC1 */
01167                 bits= rl->table_vlc[rl->n][0];
01168                 len=  rl->table_vlc[rl->n][1];
01169                 bits=bits*2;    len++; //esc1
01170                 level1= level - rl->max_level[last][run];
01171                 if(level1>0){
01172                     code= get_rl_index(rl, last, run, level1);
01173                     bits<<= rl->table_vlc[code][1];
01174                     len  += rl->table_vlc[code][1];
01175                     bits += rl->table_vlc[code][0];
01176                     bits=bits*2+sign; len++;
01177 
01178                     if(code!=rl->n && len < len_tab[index]){
01179                         bits_tab[index]= bits;
01180                         len_tab [index]= len;
01181                     }
01182                 }
01183                 /* ESC2 */
01184                 bits= rl->table_vlc[rl->n][0];
01185                 len=  rl->table_vlc[rl->n][1];
01186                 bits=bits*4+2;    len+=2; //esc2
01187                 run1 = run - rl->max_run[last][level] - 1;
01188                 if(run1>=0){
01189                     code= get_rl_index(rl, last, run1, level);
01190                     bits<<= rl->table_vlc[code][1];
01191                     len  += rl->table_vlc[code][1];
01192                     bits += rl->table_vlc[code][0];
01193                     bits=bits*2+sign; len++;
01194 
01195                     if(code!=rl->n && len < len_tab[index]){
01196                         bits_tab[index]= bits;
01197                         len_tab [index]= len;
01198                     }
01199                 }
01200                 /* ESC3 */
01201                 bits= rl->table_vlc[rl->n][0];
01202                 len = rl->table_vlc[rl->n][1];
01203                 bits=bits*4+3;    len+=2; //esc3
01204                 bits=bits*2+last; len++;
01205                 bits=bits*64+run; len+=6;
01206                 bits=bits*2+1;    len++;  //marker
01207                 bits=bits*4096+(slevel&0xfff); len+=12;
01208                 bits=bits*2+1;    len++;  //marker
01209 
01210                 if(len < len_tab[index]){
01211                     bits_tab[index]= bits;
01212                     len_tab [index]= len;
01213                 }
01214             }
01215         }
01216     }
01217 }
01218 
01219 static av_cold int encode_init(AVCodecContext *avctx)
01220 {
01221     MpegEncContext *s = avctx->priv_data;
01222     int ret;
01223     static int done = 0;
01224 
01225     if((ret=MPV_encode_init(avctx)) < 0)
01226         return ret;
01227 
01228     if (!done) {
01229         done = 1;
01230 
01231         init_uni_dc_tab();
01232 
01233         ff_init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
01234 
01235         init_uni_mpeg4_rl_tab(&ff_mpeg4_rl_intra, uni_mpeg4_intra_rl_bits, uni_mpeg4_intra_rl_len);
01236         init_uni_mpeg4_rl_tab(&ff_h263_rl_inter, uni_mpeg4_inter_rl_bits, uni_mpeg4_inter_rl_len);
01237     }
01238 
01239     s->min_qcoeff= -2048;
01240     s->max_qcoeff=  2047;
01241     s->intra_ac_vlc_length     = uni_mpeg4_intra_rl_len;
01242     s->intra_ac_vlc_last_length= uni_mpeg4_intra_rl_len + 128*64;
01243     s->inter_ac_vlc_length     = uni_mpeg4_inter_rl_len;
01244     s->inter_ac_vlc_last_length= uni_mpeg4_inter_rl_len + 128*64;
01245     s->luma_dc_vlc_length= uni_DCtab_lum_len;
01246     s->ac_esc_length= 7+2+1+6+1+12+1;
01247     s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table;
01248     s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
01249 
01250     if(s->flags & CODEC_FLAG_GLOBAL_HEADER){
01251 
01252         s->avctx->extradata= av_malloc(1024);
01253         init_put_bits(&s->pb, s->avctx->extradata, 1024);
01254 
01255         if(!(s->workaround_bugs & FF_BUG_MS))
01256             mpeg4_encode_visual_object_header(s);
01257         mpeg4_encode_vol_header(s, 0, 0);
01258 
01259 //            ff_mpeg4_stuffing(&s->pb); ?
01260         flush_put_bits(&s->pb);
01261         s->avctx->extradata_size= (put_bits_count(&s->pb)+7)>>3;
01262     }
01263     return 0;
01264 }
01265 
01266 void ff_mpeg4_init_partitions(MpegEncContext *s)
01267 {
01268     uint8_t *start= put_bits_ptr(&s->pb);
01269     uint8_t *end= s->pb.buf_end;
01270     int size= end - start;
01271     int pb_size = (((intptr_t)start + size/3)&(~3)) - (intptr_t)start;
01272     int tex_size= (size - 2*pb_size)&(~3);
01273 
01274     set_put_bits_buffer_size(&s->pb, pb_size);
01275     init_put_bits(&s->tex_pb, start + pb_size           , tex_size);
01276     init_put_bits(&s->pb2   , start + pb_size + tex_size, pb_size);
01277 }
01278 
01279 void ff_mpeg4_merge_partitions(MpegEncContext *s)
01280 {
01281     const int pb2_len   = put_bits_count(&s->pb2   );
01282     const int tex_pb_len= put_bits_count(&s->tex_pb);
01283     const int bits= put_bits_count(&s->pb);
01284 
01285     if(s->pict_type==AV_PICTURE_TYPE_I){
01286         put_bits(&s->pb, 19, DC_MARKER);
01287         s->misc_bits+=19 + pb2_len + bits - s->last_bits;
01288         s->i_tex_bits+= tex_pb_len;
01289     }else{
01290         put_bits(&s->pb, 17, MOTION_MARKER);
01291         s->misc_bits+=17 + pb2_len;
01292         s->mv_bits+= bits - s->last_bits;
01293         s->p_tex_bits+= tex_pb_len;
01294     }
01295 
01296     flush_put_bits(&s->pb2);
01297     flush_put_bits(&s->tex_pb);
01298 
01299     set_put_bits_buffer_size(&s->pb, s->pb2.buf_end - s->pb.buf);
01300     avpriv_copy_bits(&s->pb, s->pb2.buf   , pb2_len);
01301     avpriv_copy_bits(&s->pb, s->tex_pb.buf, tex_pb_len);
01302     s->last_bits= put_bits_count(&s->pb);
01303 }
01304 
01305 
01306 void ff_mpeg4_encode_video_packet_header(MpegEncContext *s)
01307 {
01308     int mb_num_bits= av_log2(s->mb_num - 1) + 1;
01309 
01310     put_bits(&s->pb, ff_mpeg4_get_video_packet_prefix_length(s), 0);
01311     put_bits(&s->pb, 1, 1);
01312 
01313     put_bits(&s->pb, mb_num_bits, s->mb_x + s->mb_y*s->mb_width);
01314     put_bits(&s->pb, s->quant_precision, s->qscale);
01315     put_bits(&s->pb, 1, 0); /* no HEC */
01316 }
01317 
01318 #define OFFSET(x) offsetof(MpegEncContext, x)
01319 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
01320 static const AVOption options[] = {
01321     { "data_partitioning",       "Use data partitioning.",      OFFSET(data_partitioning), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
01322     { "alternate_scan",          "Enable alternate scantable.", OFFSET(alternate_scan),    AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
01323     { NULL },
01324 };
01325 
01326 static const AVClass mpeg4enc_class = {
01327     .class_name = "MPEG4 encoder",
01328     .item_name  = av_default_item_name,
01329     .option     = options,
01330     .version    = LIBAVUTIL_VERSION_INT,
01331 };
01332 
01333 AVCodec ff_mpeg4_encoder = {
01334     .name           = "mpeg4",
01335     .type           = AVMEDIA_TYPE_VIDEO,
01336     .id             = CODEC_ID_MPEG4,
01337     .priv_data_size = sizeof(MpegEncContext),
01338     .init           = encode_init,
01339     .encode         = MPV_encode_picture,
01340     .close          = MPV_encode_end,
01341     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
01342     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
01343     .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
01344     .priv_class     = &mpeg4enc_class,
01345 };
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