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

   1 /*
   2  * Rate control for video encoders
   3  *
   4  * Copyright (c) 2002-2004 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 /**
  24  * @file ratecontrol.c
  25  * Rate control for video encoders.
  26  */
  27
  28 #include "avcodec.h"
  29 #include "dsputil.h"
  30 #include "ratecontrol.h"
  31 #include "mpegvideo.h"
  32 #include "eval.h"
  33
  34 #undef NDEBUG // Always check asserts, the speed effect is far too small to disable them.
  35 #include <assert.h>
  36
  37 #ifndef M_E
  38 #define M_E 2.718281828
  39 #endif
  40
  41 static int init_pass2(MpegEncContext *s);
  42 static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num);
  43
  44 void ff_write_pass1_stats(MpegEncContext *s){
  45     snprintf(s->avctx->stats_out, 256, "in:%d out:%d type:%d q:%d itex:%d ptex:%d mv:%d misc:%d fcode:%d bcode:%d mc-var:%d var:%d icount:%d skipcount:%d hbits:%d;\n",
  46             s->current_picture_ptr->display_picture_number, s->current_picture_ptr->coded_picture_number, s->pict_type,
  47             s->current_picture.quality, s->i_tex_bits, s->p_tex_bits, s->mv_bits, s->misc_bits,
  48             s->f_code, s->b_code, s->current_picture.mc_mb_var_sum, s->current_picture.mb_var_sum, s->i_count, s->skip_count, s->header_bits);
  49 }
  50
  51 static inline double qp2bits(RateControlEntry *rce, double qp){
  52     if(qp<=0.0){
  53         av_log(NULL, AV_LOG_ERROR, "qp<=0.0\n");
  54     }
  55     return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ qp;
  56 }
  57
  58 static inline double bits2qp(RateControlEntry *rce, double bits){
  59     if(bits<0.9){
  60         av_log(NULL, AV_LOG_ERROR, "bits<0.9\n");
  61     }
  62     return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ bits;
  63 }
  64
  65 int ff_rate_control_init(MpegEncContext *s)
  66 {
  67     RateControlContext *rcc= &s->rc_context;
  68     int i;
  69     char *error = NULL;
  70     static const char *const_names[]={
  71         "PI",
  72         "E",
  73         "iTex",
  74         "pTex",
  75         "tex",
  76         "mv",
  77         "fCode",
  78         "iCount",
  79         "mcVar",
  80         "var",
  81         "isI",
  82         "isP",
  83         "isB",
  84         "avgQP",
  85         "qComp",
  86 /*        "lastIQP",
  87         "lastPQP",
  88         "lastBQP",
  89         "nextNonBQP",*/
  90         "avgIITex",
  91         "avgPITex",
  92         "avgPPTex",
  93         "avgBPTex",
  94         "avgTex",
  95         NULL
  96     };
  97     static double (*func1[])(void *, double)={
  98         (void *)bits2qp,
  99         (void *)qp2bits,
 100         NULL
 101     };
 102     static const char *func1_names[]={
 103         "bits2qp",
 104         "qp2bits",
 105         NULL
 106     };
 107     emms_c();
 108
 109     rcc->rc_eq_eval = ff_parse(s->avctx->rc_eq, const_names, func1, func1_names, NULL, NULL, &error);
 110     if (!rcc->rc_eq_eval) {
 111         av_log(s->avctx, AV_LOG_ERROR, "Error parsing rc_eq \"%s\": %s\n", s->avctx->rc_eq, error? error : "");
 112         return -1;
 113     }
 114
 115     for(i=0; i<5; i++){
 116         rcc->pred[i].coeff= FF_QP2LAMBDA * 7.0;
 117         rcc->pred[i].count= 1.0;
 118
 119         rcc->pred[i].decay= 0.4;
 120         rcc->i_cplx_sum [i]=
 121         rcc->p_cplx_sum [i]=
 122         rcc->mv_bits_sum[i]=
 123         rcc->qscale_sum [i]=
 124         rcc->frame_count[i]= 1; // 1 is better cuz of 1/0 and such
 125         rcc->last_qscale_for[i]=FF_QP2LAMBDA * 5;
 126     }
 127     rcc->buffer_index= s->avctx->rc_initial_buffer_occupancy;
 128
 129     if(s->flags&CODEC_FLAG_PASS2){
 130         int i;
 131         char *p;
 132
 133         /* find number of pics */
 134         p= s->avctx->stats_in;
 135         for(i=-1; p; i++){
 136             p= strchr(p+1, ';');
 137         }
 138         i+= s->max_b_frames;
 139         if(i<=0 || i>=INT_MAX / sizeof(RateControlEntry))
 140             return -1;
 141         rcc->entry = (RateControlEntry*)av_mallocz(i*sizeof(RateControlEntry));
 142         rcc->num_entries= i;
 143
 144         /* init all to skipped p frames (with b frames we might have a not encoded frame at the end FIXME) */
 145         for(i=0; i<rcc->num_entries; i++){
 146             RateControlEntry *rce= &rcc->entry[i];
 147             rce->pict_type= rce->new_pict_type=P_TYPE;
 148             rce->qscale= rce->new_qscale=FF_QP2LAMBDA * 2;
 149             rce->misc_bits= s->mb_num + 10;
 150             rce->mb_var_sum= s->mb_num*100;
 151         }
 152
 153         /* read stats */
 154         p= s->avctx->stats_in;
 155         for(i=0; i<rcc->num_entries - s->max_b_frames; i++){
 156             RateControlEntry *rce;
 157             int picture_number;
 158             int e;
 159             char *next;
 160
 161             next= strchr(p, ';');
 162             if(next){
 163                 (*next)=0; //sscanf in unbelieavle slow on looong strings //FIXME copy / dont write
 164                 next++;
 165             }
 166             e= sscanf(p, " in:%d ", &picture_number);
 167
 168             assert(picture_number >= 0);
 169             assert(picture_number < rcc->num_entries);
 170             rce= &rcc->entry[picture_number];
 171
 172             e+=sscanf(p, " in:%*d out:%*d type:%d q:%f itex:%d ptex:%d mv:%d misc:%d fcode:%d bcode:%d mc-var:%d var:%d icount:%d skipcount:%d hbits:%d",
 173                    &rce->pict_type, &rce->qscale, &rce->i_tex_bits, &rce->p_tex_bits, &rce->mv_bits, &rce->misc_bits,
 174                    &rce->f_code, &rce->b_code, &rce->mc_mb_var_sum, &rce->mb_var_sum, &rce->i_count, &rce->skip_count, &rce->header_bits);
 175             if(e!=14){
 176                 av_log(s->avctx, AV_LOG_ERROR, "statistics are damaged at line %d, parser out=%d\n", i, e);
 177                 return -1;
 178             }
 179
 180             p= next;
 181         }
 182
 183         if(init_pass2(s) < 0) return -1;
 184
 185         //FIXME maybe move to end
 186         if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID) {
 187 #ifdef CONFIG_XVID
 188             return ff_xvid_rate_control_init(s);
 189 #else
 190             av_log(s->avctx, AV_LOG_ERROR, "XviD ratecontrol requires libavcodec compiled with XviD support\n");
 191             return -1;
 192 #endif
 193         }
 194     }
 195
 196     if(!(s->flags&CODEC_FLAG_PASS2)){
 197
 198         rcc->short_term_qsum=0.001;
 199         rcc->short_term_qcount=0.001;
 200
 201         rcc->pass1_rc_eq_output_sum= 0.001;
 202         rcc->pass1_wanted_bits=0.001;
 203
 204         /* init stuff with the user specified complexity */
 205         if(s->avctx->rc_initial_cplx){
 206             for(i=0; i<60*30; i++){
 207                 double bits= s->avctx->rc_initial_cplx * (i/10000.0 + 1.0)*s->mb_num;
 208                 RateControlEntry rce;
 209                 double q;
 210
 211                 if     (i%((s->gop_size+3)/4)==0) rce.pict_type= I_TYPE;
 212                 else if(i%(s->max_b_frames+1))    rce.pict_type= B_TYPE;
 213                 else                              rce.pict_type= P_TYPE;
 214
 215                 rce.new_pict_type= rce.pict_type;
 216                 rce.mc_mb_var_sum= bits*s->mb_num/100000;
 217                 rce.mb_var_sum   = s->mb_num;
 218                 rce.qscale   = FF_QP2LAMBDA * 2;
 219                 rce.f_code   = 2;
 220                 rce.b_code   = 1;
 221                 rce.misc_bits= 1;
 222
 223                 if(s->pict_type== I_TYPE){
 224                     rce.i_count   = s->mb_num;
 225                     rce.i_tex_bits= bits;
 226                     rce.p_tex_bits= 0;
 227                     rce.mv_bits= 0;
 228                 }else{
 229                     rce.i_count   = 0; //FIXME we do know this approx
 230                     rce.i_tex_bits= 0;
 231                     rce.p_tex_bits= bits*0.9;
 232                     rce.mv_bits= bits*0.1;
 233                 }
 234                 rcc->i_cplx_sum [rce.pict_type] += rce.i_tex_bits*rce.qscale;
 235                 rcc->p_cplx_sum [rce.pict_type] += rce.p_tex_bits*rce.qscale;
 236                 rcc->mv_bits_sum[rce.pict_type] += rce.mv_bits;
 237                 rcc->frame_count[rce.pict_type] ++;
 238
 239                 bits= rce.i_tex_bits + rce.p_tex_bits;
 240
 241                 q= get_qscale(s, &rce, rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum, i);
 242                 rcc->pass1_wanted_bits+= s->bit_rate/(1/av_q2d(s->avctx->time_base)); //FIXME missbehaves a little for variable fps
 243             }
 244         }
 245
 246     }
 247
 248     return 0;
 249 }
 250
 251 void ff_rate_control_uninit(MpegEncContext *s)
 252 {
 253     RateControlContext *rcc= &s->rc_context;
 254     emms_c();
 255
 256     ff_eval_free(rcc->rc_eq_eval);
 257     av_freep(&rcc->entry);
 258
 259 #ifdef CONFIG_XVID
 260     if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
 261         ff_xvid_rate_control_uninit(s);
 262 #endif
 263 }
 264
 265 int ff_vbv_update(MpegEncContext *s, int frame_size){
 266     RateControlContext *rcc= &s->rc_context;
 267     const double fps= 1/av_q2d(s->avctx->time_base);
 268     const int buffer_size= s->avctx->rc_buffer_size;
 269     const double min_rate= s->avctx->rc_min_rate/fps;
 270     const double max_rate= s->avctx->rc_max_rate/fps;
 271
 272 //printf("%d %f %d %f %f\n", buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate);
 273     if(buffer_size){
 274         int left;
 275
 276         rcc->buffer_index-= frame_size;
 277         if(rcc->buffer_index < 0){
 278             av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n");
 279             rcc->buffer_index= 0;
 280         }
 281
 282         left= buffer_size - rcc->buffer_index - 1;
 283         rcc->buffer_index += av_clip(left, min_rate, max_rate);
 284
 285         if(rcc->buffer_index > buffer_size){
 286             int stuffing= ceil((rcc->buffer_index - buffer_size)/8);
 287
 288             if(stuffing < 4 && s->codec_id == CODEC_ID_MPEG4)
 289                 stuffing=4;
 290             rcc->buffer_index -= 8*stuffing;
 291
 292             if(s->avctx->debug & FF_DEBUG_RC)
 293                 av_log(s->avctx, AV_LOG_DEBUG, "stuffing %d bytes\n", stuffing);
 294
 295             return stuffing;
 296         }
 297     }
 298     return 0;
 299 }
 300
 301 /**
 302  * modifies the bitrate curve from pass1 for one frame
 303  */
 304 static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num){
 305     RateControlContext *rcc= &s->rc_context;
 306     AVCodecContext *a= s->avctx;
 307     double q, bits;
 308     const int pict_type= rce->new_pict_type;
 309     const double mb_num= s->mb_num;
 310     int i;
 311
 312     double const_values[]={
 313         M_PI,
 314         M_E,
 315         rce->i_tex_bits*rce->qscale,
 316         rce->p_tex_bits*rce->qscale,
 317         (rce->i_tex_bits + rce->p_tex_bits)*(double)rce->qscale,
 318         rce->mv_bits/mb_num,
 319         rce->pict_type == B_TYPE ? (rce->f_code + rce->b_code)*0.5 : rce->f_code,
 320         rce->i_count/mb_num,
 321         rce->mc_mb_var_sum/mb_num,
 322         rce->mb_var_sum/mb_num,
 323         rce->pict_type == I_TYPE,
 324         rce->pict_type == P_TYPE,
 325         rce->pict_type == B_TYPE,
 326         rcc->qscale_sum[pict_type] / (double)rcc->frame_count[pict_type],
 327         a->qcompress,
 328 /*        rcc->last_qscale_for[I_TYPE],
 329         rcc->last_qscale_for[P_TYPE],
 330         rcc->last_qscale_for[B_TYPE],
 331         rcc->next_non_b_qscale,*/
 332         rcc->i_cplx_sum[I_TYPE] / (double)rcc->frame_count[I_TYPE],
 333         rcc->i_cplx_sum[P_TYPE] / (double)rcc->frame_count[P_TYPE],
 334         rcc->p_cplx_sum[P_TYPE] / (double)rcc->frame_count[P_TYPE],
 335         rcc->p_cplx_sum[B_TYPE] / (double)rcc->frame_count[B_TYPE],
 336         (rcc->i_cplx_sum[pict_type] + rcc->p_cplx_sum[pict_type]) / (double)rcc->frame_count[pict_type],
 337         0
 338     };
 339
 340     bits= ff_parse_eval(rcc->rc_eq_eval, const_values, rce);
 341     if (isnan(bits)) {
 342         av_log(s->avctx, AV_LOG_ERROR, "Error evaluating rc_eq \"%s\"\n", s->avctx->rc_eq);
 343         return -1;
 344     }
 345
 346     rcc->pass1_rc_eq_output_sum+= bits;
 347     bits*=rate_factor;
 348     if(bits<0.0) bits=0.0;
 349     bits+= 1.0; //avoid 1/0 issues
 350
 351     /* user override */
 352     for(i=0; i<s->avctx->rc_override_count; i++){
 353         RcOverride *rco= s->avctx->rc_override;
 354         if(rco[i].start_frame > frame_num) continue;
 355         if(rco[i].end_frame   < frame_num) continue;
 356
 357         if(rco[i].qscale)
 358             bits= qp2bits(rce, rco[i].qscale); //FIXME move at end to really force it?
 359         else
 360             bits*= rco[i].quality_factor;
 361     }
 362
 363     q= bits2qp(rce, bits);
 364
 365     /* I/B difference */
 366     if     (pict_type==I_TYPE && s->avctx->i_quant_factor<0.0)
 367         q= -q*s->avctx->i_quant_factor + s->avctx->i_quant_offset;
 368     else if(pict_type==B_TYPE && s->avctx->b_quant_factor<0.0)
 369         q= -q*s->avctx->b_quant_factor + s->avctx->b_quant_offset;
 370
 371     return q;
 372 }
 373
 374 static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q){
 375     RateControlContext *rcc= &s->rc_context;
 376     AVCodecContext *a= s->avctx;
 377     const int pict_type= rce->new_pict_type;
 378     const double last_p_q    = rcc->last_qscale_for[P_TYPE];
 379     const double last_non_b_q= rcc->last_qscale_for[rcc->last_non_b_pict_type];
 380
 381     if     (pict_type==I_TYPE && (a->i_quant_factor>0.0 || rcc->last_non_b_pict_type==P_TYPE))
 382         q= last_p_q    *FFABS(a->i_quant_factor) + a->i_quant_offset;
 383     else if(pict_type==B_TYPE && a->b_quant_factor>0.0)
 384         q= last_non_b_q*    a->b_quant_factor  + a->b_quant_offset;
 385
 386     /* last qscale / qdiff stuff */
 387     if(rcc->last_non_b_pict_type==pict_type || pict_type!=I_TYPE){
 388         double last_q= rcc->last_qscale_for[pict_type];
 389         const int maxdiff= FF_QP2LAMBDA * a->max_qdiff;
 390
 391         if     (q > last_q + maxdiff) q= last_q + maxdiff;
 392         else if(q < last_q - maxdiff) q= last_q - maxdiff;
 393     }
 394
 395     rcc->last_qscale_for[pict_type]= q; //Note we cant do that after blurring
 396
 397     if(pict_type!=B_TYPE)
 398         rcc->last_non_b_pict_type= pict_type;
 399
 400     return q;
 401 }
 402
 403 /**
 404  * gets the qmin & qmax for pict_type
 405  */
 406 static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pict_type){
 407     int qmin= s->avctx->lmin;
 408     int qmax= s->avctx->lmax;
 409
 410     assert(qmin <= qmax);
 411
 412     if(pict_type==B_TYPE){
 413         qmin= (int)(qmin*FFABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
 414         qmax= (int)(qmax*FFABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
 415     }else if(pict_type==I_TYPE){
 416         qmin= (int)(qmin*FFABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
 417         qmax= (int)(qmax*FFABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
 418     }
 419
 420     qmin= av_clip(qmin, 1, FF_LAMBDA_MAX);
 421     qmax= av_clip(qmax, 1, FF_LAMBDA_MAX);
 422
 423     if(qmax<qmin) qmax= qmin;
 424
 425     *qmin_ret= qmin;
 426     *qmax_ret= qmax;
 427 }
 428
 429 static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q, int frame_num){
 430     RateControlContext *rcc= &s->rc_context;
 431     int qmin, qmax;
 432     double bits;
 433     const int pict_type= rce->new_pict_type;
 434     const double buffer_size= s->avctx->rc_buffer_size;
 435     const double fps= 1/av_q2d(s->avctx->time_base);
 436     const double min_rate= s->avctx->rc_min_rate / fps;
 437     const double max_rate= s->avctx->rc_max_rate / fps;
 438
 439     get_qminmax(&qmin, &qmax, s, pict_type);
 440
 441     /* modulation */
 442     if(s->avctx->rc_qmod_freq && frame_num%s->avctx->rc_qmod_freq==0 && pict_type==P_TYPE)
 443         q*= s->avctx->rc_qmod_amp;
 444
 445     bits= qp2bits(rce, q);
 446 //printf("q:%f\n", q);
 447     /* buffer overflow/underflow protection */
 448     if(buffer_size){
 449         double expected_size= rcc->buffer_index;
 450         double q_limit;
 451
 452         if(min_rate){
 453             double d= 2*(buffer_size - expected_size)/buffer_size;
 454             if(d>1.0) d=1.0;
 455             else if(d<0.0001) d=0.0001;
 456             q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
 457
 458             q_limit= bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index)*3, 1));
 459             if(q > q_limit){
 460                 if(s->avctx->debug&FF_DEBUG_RC){
 461                     av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
 462                 }
 463                 q= q_limit;
 464             }
 465         }
 466
 467         if(max_rate){
 468             double d= 2*expected_size/buffer_size;
 469             if(d>1.0) d=1.0;
 470             else if(d<0.0001) d=0.0001;
 471             q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
 472
 473             q_limit= bits2qp(rce, FFMAX(rcc->buffer_index/3, 1));
 474             if(q < q_limit){
 475                 if(s->avctx->debug&FF_DEBUG_RC){
 476                     av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
 477                 }
 478                 q= q_limit;
 479             }
 480         }
 481     }
 482 //printf("q:%f max:%f min:%f size:%f index:%d bits:%f agr:%f\n", q,max_rate, min_rate, buffer_size, rcc->buffer_index, bits, s->avctx->rc_buffer_aggressivity);
 483     if(s->avctx->rc_qsquish==0.0 || qmin==qmax){
 484         if     (q<qmin) q=qmin;
 485         else if(q>qmax) q=qmax;
 486     }else{
 487         double min2= log(qmin);
 488         double max2= log(qmax);
 489
 490         q= log(q);
 491         q= (q - min2)/(max2-min2) - 0.5;
 492         q*= -4.0;
 493         q= 1.0/(1.0 + exp(q));
 494         q= q*(max2-min2) + min2;
 495
 496         q= exp(q);
 497     }
 498
 499     return q;
 500 }
 501
 502 //----------------------------------
 503 // 1 Pass Code
 504
 505 static double predict_size(Predictor *p, double q, double var)
 506 {
 507      return p->coeff*var / (q*p->count);
 508 }
 509
 510 /*
 511 static double predict_qp(Predictor *p, double size, double var)
 512 {
 513 //printf("coeff:%f, count:%f, var:%f, size:%f//\n", p->coeff, p->count, var, size);
 514      return p->coeff*var / (size*p->count);
 515 }
 516 */
 517
 518 static void update_predictor(Predictor *p, double q, double var, double size)
 519 {
 520     double new_coeff= size*q / (var + 1);
 521     if(var<10) return;
 522
 523     p->count*= p->decay;
 524     p->coeff*= p->decay;
 525     p->count++;
 526     p->coeff+= new_coeff;
 527 }
 528
 529 static void adaptive_quantization(MpegEncContext *s, double q){
 530     int i;
 531     const float lumi_masking= s->avctx->lumi_masking / (128.0*128.0);
 532     const float dark_masking= s->avctx->dark_masking / (128.0*128.0);
 533     const float temp_cplx_masking= s->avctx->temporal_cplx_masking;
 534     const float spatial_cplx_masking = s->avctx->spatial_cplx_masking;
 535     const float p_masking = s->avctx->p_masking;
 536     const float border_masking = s->avctx->border_masking;
 537     float bits_sum= 0.0;
 538     float cplx_sum= 0.0;
 539     float cplx_tab[s->mb_num];
 540     float bits_tab[s->mb_num];
 541     const int qmin= s->avctx->mb_lmin;
 542     const int qmax= s->avctx->mb_lmax;
 543     Picture * const pic= &s->current_picture;
 544     const int mb_width = s->mb_width;
 545     const int mb_height = s->mb_height;
 546
 547     for(i=0; i<s->mb_num; i++){
 548         const int mb_xy= s->mb_index2xy[i];
 549         float temp_cplx= sqrt(pic->mc_mb_var[mb_xy]); //FIXME merge in pow()
 550         float spat_cplx= sqrt(pic->mb_var[mb_xy]);
 551         const int lumi= pic->mb_mean[mb_xy];
 552         float bits, cplx, factor;
 553         int mb_x = mb_xy % s->mb_stride;
 554         int mb_y = mb_xy / s->mb_stride;
 555         int mb_distance;
 556         float mb_factor = 0.0;
 557 #if 0
 558         if(spat_cplx < q/3) spat_cplx= q/3; //FIXME finetune
 559         if(temp_cplx < q/3) temp_cplx= q/3; //FIXME finetune
 560 #endif
 561         if(spat_cplx < 4) spat_cplx= 4; //FIXME finetune
 562         if(temp_cplx < 4) temp_cplx= 4; //FIXME finetune
 563
 564         if((s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_INTRA)){//FIXME hq mode
 565             cplx= spat_cplx;
 566             factor= 1.0 + p_masking;
 567         }else{
 568             cplx= temp_cplx;
 569             factor= pow(temp_cplx, - temp_cplx_masking);
 570         }
 571         factor*=pow(spat_cplx, - spatial_cplx_masking);
 572
 573         if(lumi>127)
 574             factor*= (1.0 - (lumi-128)*(lumi-128)*lumi_masking);
 575         else
 576             factor*= (1.0 - (lumi-128)*(lumi-128)*dark_masking);
 577
 578         if(mb_x < mb_width/5){
 579             mb_distance = mb_width/5 - mb_x;
 580             mb_factor = (float)mb_distance / (float)(mb_width/5);
 581         }else if(mb_x > 4*mb_width/5){
 582             mb_distance = mb_x - 4*mb_width/5;
 583             mb_factor = (float)mb_distance / (float)(mb_width/5);
 584         }
 585         if(mb_y < mb_height/5){
 586             mb_distance = mb_height/5 - mb_y;
 587             mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
 588         }else if(mb_y > 4*mb_height/5){
 589             mb_distance = mb_y - 4*mb_height/5;
 590             mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
 591         }
 592
 593         factor*= 1.0 - border_masking*mb_factor;
 594
 595         if(factor<0.00001) factor= 0.00001;
 596
 597         bits= cplx*factor;
 598         cplx_sum+= cplx;
 599         bits_sum+= bits;
 600         cplx_tab[i]= cplx;
 601         bits_tab[i]= bits;
 602     }
 603
 604     /* handle qmin/qmax cliping */
 605     if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
 606         float factor= bits_sum/cplx_sum;
 607         for(i=0; i<s->mb_num; i++){
 608             float newq= q*cplx_tab[i]/bits_tab[i];
 609             newq*= factor;
 610
 611             if     (newq > qmax){
 612                 bits_sum -= bits_tab[i];
 613                 cplx_sum -= cplx_tab[i]*q/qmax;
 614             }
 615             else if(newq < qmin){
 616                 bits_sum -= bits_tab[i];
 617                 cplx_sum -= cplx_tab[i]*q/qmin;
 618             }
 619         }
 620         if(bits_sum < 0.001) bits_sum= 0.001;
 621         if(cplx_sum < 0.001) cplx_sum= 0.001;
 622     }
 623
 624     for(i=0; i<s->mb_num; i++){
 625         const int mb_xy= s->mb_index2xy[i];
 626         float newq= q*cplx_tab[i]/bits_tab[i];
 627         int intq;
 628
 629         if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
 630             newq*= bits_sum/cplx_sum;
 631         }
 632
 633         intq= (int)(newq + 0.5);
 634
 635         if     (intq > qmax) intq= qmax;
 636         else if(intq < qmin) intq= qmin;
 637 //if(i%s->mb_width==0) printf("\n");
 638 //printf("%2d%3d ", intq, ff_sqrt(s->mc_mb_var[i]));
 639         s->lambda_table[mb_xy]= intq;
 640     }
 641 }
 642
 643 void ff_get_2pass_fcode(MpegEncContext *s){
 644     RateControlContext *rcc= &s->rc_context;
 645     int picture_number= s->picture_number;
 646     RateControlEntry *rce;
 647
 648     rce= &rcc->entry[picture_number];
 649     s->f_code= rce->f_code;
 650     s->b_code= rce->b_code;
 651 }
 652
 653 //FIXME rd or at least approx for dquant
 654
 655 float ff_rate_estimate_qscale(MpegEncContext *s, int dry_run)
 656 {
 657     float q;
 658     int qmin, qmax;
 659     float br_compensation;
 660     double diff;
 661     double short_term_q;
 662     double fps;
 663     int picture_number= s->picture_number;
 664     int64_t wanted_bits;
 665     RateControlContext *rcc= &s->rc_context;
 666     AVCodecContext *a= s->avctx;
 667     RateControlEntry local_rce, *rce;
 668     double bits;
 669     double rate_factor;
 670     int var;
 671     const int pict_type= s->pict_type;
 672     Picture * const pic= &s->current_picture;
 673     emms_c();
 674
 675 #ifdef CONFIG_XVID
 676     if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
 677         return ff_xvid_rate_estimate_qscale(s, dry_run);
 678 #endif
 679
 680     get_qminmax(&qmin, &qmax, s, pict_type);
 681
 682     fps= 1/av_q2d(s->avctx->time_base);
 683 //printf("input_pic_num:%d pic_num:%d frame_rate:%d\n", s->input_picture_number, s->picture_number, s->frame_rate);
 684         /* update predictors */
 685     if(picture_number>2 && !dry_run){
 686         const int last_var= s->last_pict_type == I_TYPE ? rcc->last_mb_var_sum : rcc->last_mc_mb_var_sum;
 687         update_predictor(&rcc->pred[s->last_pict_type], rcc->last_qscale, sqrt(last_var), s->frame_bits);
 688     }
 689
 690     if(s->flags&CODEC_FLAG_PASS2){
 691         assert(picture_number>=0);
 692         assert(picture_number<rcc->num_entries);
 693         rce= &rcc->entry[picture_number];
 694         wanted_bits= rce->expected_bits;
 695     }else{
 696         rce= &local_rce;
 697         wanted_bits= (uint64_t)(s->bit_rate*(double)picture_number/fps);
 698     }
 699
 700     diff= s->total_bits - wanted_bits;
 701     br_compensation= (a->bit_rate_tolerance - diff)/a->bit_rate_tolerance;
 702     if(br_compensation<=0.0) br_compensation=0.001;
 703
 704     var= pict_type == I_TYPE ? pic->mb_var_sum : pic->mc_mb_var_sum;
 705
 706     short_term_q = 0; /* avoid warning */
 707     if(s->flags&CODEC_FLAG_PASS2){
 708         if(pict_type!=I_TYPE)
 709             assert(pict_type == rce->new_pict_type);
 710
 711         q= rce->new_qscale / br_compensation;
 712 //printf("%f %f %f last:%d var:%d type:%d//\n", q, rce->new_qscale, br_compensation, s->frame_bits, var, pict_type);
 713     }else{
 714         rce->pict_type=
 715         rce->new_pict_type= pict_type;
 716         rce->mc_mb_var_sum= pic->mc_mb_var_sum;
 717         rce->mb_var_sum   = pic->   mb_var_sum;
 718         rce->qscale   = FF_QP2LAMBDA * 2;
 719         rce->f_code   = s->f_code;
 720         rce->b_code   = s->b_code;
 721         rce->misc_bits= 1;
 722
 723         bits= predict_size(&rcc->pred[pict_type], rce->qscale, sqrt(var));
 724         if(pict_type== I_TYPE){
 725             rce->i_count   = s->mb_num;
 726             rce->i_tex_bits= bits;
 727             rce->p_tex_bits= 0;
 728             rce->mv_bits= 0;
 729         }else{
 730             rce->i_count   = 0; //FIXME we do know this approx
 731             rce->i_tex_bits= 0;
 732             rce->p_tex_bits= bits*0.9;
 733
 734             rce->mv_bits= bits*0.1;
 735         }
 736         rcc->i_cplx_sum [pict_type] += rce->i_tex_bits*rce->qscale;
 737         rcc->p_cplx_sum [pict_type] += rce->p_tex_bits*rce->qscale;
 738         rcc->mv_bits_sum[pict_type] += rce->mv_bits;
 739         rcc->frame_count[pict_type] ++;
 740
 741         bits= rce->i_tex_bits + rce->p_tex_bits;
 742         rate_factor= rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum * br_compensation;
 743
 744         q= get_qscale(s, rce, rate_factor, picture_number);
 745         if (q < 0)
 746             return -1;
 747
 748         assert(q>0.0);
 749 //printf("%f ", q);
 750         q= get_diff_limited_q(s, rce, q);
 751 //printf("%f ", q);
 752         assert(q>0.0);
 753
 754         if(pict_type==P_TYPE || s->intra_only){ //FIXME type dependent blur like in 2-pass
 755             rcc->short_term_qsum*=a->qblur;
 756             rcc->short_term_qcount*=a->qblur;
 757
 758             rcc->short_term_qsum+= q;
 759             rcc->short_term_qcount++;
 760 //printf("%f ", q);
 761             q= short_term_q= rcc->short_term_qsum/rcc->short_term_qcount;
 762 //printf("%f ", q);
 763         }
 764         assert(q>0.0);
 765
 766         q= modify_qscale(s, rce, q, picture_number);
 767
 768         rcc->pass1_wanted_bits+= s->bit_rate/fps;
 769
 770         assert(q>0.0);
 771     }
 772
 773     if(s->avctx->debug&FF_DEBUG_RC){
 774         av_log(s->avctx, AV_LOG_DEBUG, "%c qp:%d<%2.1f<%d %d want:%d total:%d comp:%f st_q:%2.2f size:%d var:%d/%d br:%d fps:%d\n",
 775         av_get_pict_type_char(pict_type), qmin, q, qmax, picture_number, (int)wanted_bits/1000, (int)s->total_bits/1000,
 776         br_compensation, short_term_q, s->frame_bits, pic->mb_var_sum, pic->mc_mb_var_sum, s->bit_rate/1000, (int)fps
 777         );
 778     }
 779
 780     if     (q<qmin) q=qmin;
 781     else if(q>qmax) q=qmax;
 782
 783     if(s->adaptive_quant)
 784         adaptive_quantization(s, q);
 785     else
 786         q= (int)(q + 0.5);
 787
 788     if(!dry_run){
 789         rcc->last_qscale= q;
 790         rcc->last_mc_mb_var_sum= pic->mc_mb_var_sum;
 791         rcc->last_mb_var_sum= pic->mb_var_sum;
 792     }
 793 #if 0
 794 {
 795     static int mvsum=0, texsum=0;
 796     mvsum += s->mv_bits;
 797     texsum += s->i_tex_bits + s->p_tex_bits;
 798     printf("%d %d//\n\n", mvsum, texsum);
 799 }
 800 #endif
 801     return q;
 802 }
 803
 804 //----------------------------------------------
 805 // 2-Pass code
 806
 807 static int init_pass2(MpegEncContext *s)
 808 {
 809     RateControlContext *rcc= &s->rc_context;
 810     AVCodecContext *a= s->avctx;
 811     int i, toobig;
 812     double fps= 1/av_q2d(s->avctx->time_base);
 813     double complexity[5]={0,0,0,0,0};   // aproximate bits at quant=1
 814     uint64_t const_bits[5]={0,0,0,0,0}; // quantizer independent bits
 815     uint64_t all_const_bits;
 816     uint64_t all_available_bits= (uint64_t)(s->bit_rate*(double)rcc->num_entries/fps);
 817     double rate_factor=0;
 818     double step;
 819     //int last_i_frame=-10000000;
 820     const int filter_size= (int)(a->qblur*4) | 1;
 821     double expected_bits;
 822     double *qscale, *blured_qscale, qscale_sum;
 823
 824     /* find complexity & const_bits & decide the pict_types */
 825     for(i=0; i<rcc->num_entries; i++){
 826         RateControlEntry *rce= &rcc->entry[i];
 827
 828         rce->new_pict_type= rce->pict_type;
 829         rcc->i_cplx_sum [rce->pict_type] += rce->i_tex_bits*rce->qscale;
 830         rcc->p_cplx_sum [rce->pict_type] += rce->p_tex_bits*rce->qscale;
 831         rcc->mv_bits_sum[rce->pict_type] += rce->mv_bits;
 832         rcc->frame_count[rce->pict_type] ++;
 833
 834         complexity[rce->new_pict_type]+= (rce->i_tex_bits+ rce->p_tex_bits)*(double)rce->qscale;
 835         const_bits[rce->new_pict_type]+= rce->mv_bits + rce->misc_bits;
 836     }
 837     all_const_bits= const_bits[I_TYPE] + const_bits[P_TYPE] + const_bits[B_TYPE];
 838
 839     if(all_available_bits < all_const_bits){
 840         av_log(s->avctx, AV_LOG_ERROR, "requested bitrate is too low\n");
 841         return -1;
 842     }
 843
 844     qscale= av_malloc(sizeof(double)*rcc->num_entries);
 845     blured_qscale= av_malloc(sizeof(double)*rcc->num_entries);
 846     toobig = 0;
 847
 848     for(step=256*256; step>0.0000001; step*=0.5){
 849         expected_bits=0;
 850         rate_factor+= step;
 851
 852         rcc->buffer_index= s->avctx->rc_buffer_size/2;
 853
 854         /* find qscale */
 855         for(i=0; i<rcc->num_entries; i++){
 856             qscale[i]= get_qscale(s, &rcc->entry[i], rate_factor, i);
 857         }
 858         assert(filter_size%2==1);
 859
 860         /* fixed I/B QP relative to P mode */
 861         for(i=rcc->num_entries-1; i>=0; i--){
 862             RateControlEntry *rce= &rcc->entry[i];
 863
 864             qscale[i]= get_diff_limited_q(s, rce, qscale[i]);
 865         }
 866
 867         /* smooth curve */
 868         for(i=0; i<rcc->num_entries; i++){
 869             RateControlEntry *rce= &rcc->entry[i];
 870             const int pict_type= rce->new_pict_type;
 871             int j;
 872             double q=0.0, sum=0.0;
 873
 874             for(j=0; j<filter_size; j++){
 875                 int index= i+j-filter_size/2;
 876                 double d= index-i;
 877                 double coeff= a->qblur==0 ? 1.0 : exp(-d*d/(a->qblur * a->qblur));
 878
 879                 if(index < 0 || index >= rcc->num_entries) continue;
 880                 if(pict_type != rcc->entry[index].new_pict_type) continue;
 881                 q+= qscale[index] * coeff;
 882                 sum+= coeff;
 883             }
 884             blured_qscale[i]= q/sum;
 885         }
 886
 887         /* find expected bits */
 888         for(i=0; i<rcc->num_entries; i++){
 889             RateControlEntry *rce= &rcc->entry[i];
 890             double bits;
 891             rce->new_qscale= modify_qscale(s, rce, blured_qscale[i], i);
 892             bits= qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits;
 893 //printf("%d %f\n", rce->new_bits, blured_qscale[i]);
 894             bits += 8*ff_vbv_update(s, bits);
 895
 896             rce->expected_bits= expected_bits;
 897             expected_bits += bits;
 898         }
 899
 900         /*
 901         av_log(s->avctx, AV_LOG_INFO,
 902             "expected_bits: %f all_available_bits: %d rate_factor: %f\n",
 903             expected_bits, (int)all_available_bits, rate_factor);
 904         */
 905         if(expected_bits > all_available_bits) {
 906             rate_factor-= step;
 907             ++toobig;
 908         }
 909     }
 910     av_free(qscale);
 911     av_free(blured_qscale);
 912
 913     /* check bitrate calculations and print info */
 914     qscale_sum = 0.0;
 915     for(i=0; i<rcc->num_entries; i++){
 916         /* av_log(s->avctx, AV_LOG_DEBUG, "[lavc rc] entry[%d].new_qscale = %.3f  qp = %.3f\n",
 917             i, rcc->entry[i].new_qscale, rcc->entry[i].new_qscale / FF_QP2LAMBDA); */
 918         qscale_sum += av_clip(rcc->entry[i].new_qscale / FF_QP2LAMBDA, s->avctx->qmin, s->avctx->qmax);
 919     }
 920     assert(toobig <= 40);
 921     av_log(s->avctx, AV_LOG_DEBUG,
 922         "[lavc rc] requested bitrate: %d bps  expected bitrate: %d bps\n",
 923         s->bit_rate,
 924         (int)(expected_bits / ((double)all_available_bits/s->bit_rate)));
 925     av_log(s->avctx, AV_LOG_DEBUG,
 926         "[lavc rc] estimated target average qp: %.3f\n",
 927         (float)qscale_sum / rcc->num_entries);
 928     if (toobig == 0) {
 929         av_log(s->avctx, AV_LOG_INFO,
 930             "[lavc rc] Using all of requested bitrate is not "
 931             "necessary for this video with these parameters.\n");
 932     } else if (toobig == 40) {
 933         av_log(s->avctx, AV_LOG_ERROR,
 934             "[lavc rc] Error: bitrate too low for this video "
 935             "with these parameters.\n");
 936         return -1;
 937     } else if (fabs(expected_bits/all_available_bits - 1.0) > 0.01) {
 938         av_log(s->avctx, AV_LOG_ERROR,
 939             "[lavc rc] Error: 2pass curve failed to converge\n");
 940         return -1;
 941     }
 942
 943     return 0;
 944 }