2 * Rate control for video encoders
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * Rate control for video encoders.
28 #include "mpegvideo.h"
30 #undef NDEBUG // allways check asserts, the speed effect is far too small to disable them
34 #define M_E 2.718281828
37 static int init_pass2(MpegEncContext *s);
38 static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num);
40 void ff_write_pass1_stats(MpegEncContext *s){
41 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",
42 s->current_picture_ptr->display_picture_number, s->current_picture_ptr->coded_picture_number, s->pict_type,
43 s->current_picture.quality, s->i_tex_bits, s->p_tex_bits, s->mv_bits, s->misc_bits,
44 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);
47 int ff_rate_control_init(MpegEncContext *s)
49 RateControlContext *rcc= &s->rc_context;
54 rcc->pred[i].coeff= FF_QP2LAMBDA * 7.0;
55 rcc->pred[i].count= 1.0;
57 rcc->pred[i].decay= 0.4;
62 rcc->frame_count[i]= 1; // 1 is better cuz of 1/0 and such
63 rcc->last_qscale_for[i]=FF_QP2LAMBDA * 5;
65 rcc->buffer_index= s->avctx->rc_initial_buffer_occupancy;
67 if(s->flags&CODEC_FLAG_PASS2){
71 /* find number of pics */
72 p= s->avctx->stats_in;
77 if(i<=0 || i>=INT_MAX / sizeof(RateControlEntry))
79 rcc->entry = (RateControlEntry*)av_mallocz(i*sizeof(RateControlEntry));
82 /* init all to skipped p frames (with b frames we might have a not encoded frame at the end FIXME) */
83 for(i=0; i<rcc->num_entries; i++){
84 RateControlEntry *rce= &rcc->entry[i];
85 rce->pict_type= rce->new_pict_type=P_TYPE;
86 rce->qscale= rce->new_qscale=FF_QP2LAMBDA * 2;
87 rce->misc_bits= s->mb_num + 10;
88 rce->mb_var_sum= s->mb_num*100;
92 p= s->avctx->stats_in;
93 for(i=0; i<rcc->num_entries - s->max_b_frames; i++){
94 RateControlEntry *rce;
101 (*next)=0; //sscanf in unbelieavle slow on looong strings //FIXME copy / dont write
104 e= sscanf(p, " in:%d ", &picture_number);
106 assert(picture_number >= 0);
107 assert(picture_number < rcc->num_entries);
108 rce= &rcc->entry[picture_number];
110 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",
111 &rce->pict_type, &rce->qscale, &rce->i_tex_bits, &rce->p_tex_bits, &rce->mv_bits, &rce->misc_bits,
112 &rce->f_code, &rce->b_code, &rce->mc_mb_var_sum, &rce->mb_var_sum, &rce->i_count, &rce->skip_count, &rce->header_bits);
114 av_log(s->avctx, AV_LOG_ERROR, "statistics are damaged at line %d, parser out=%d\n", i, e);
121 if(init_pass2(s) < 0) return -1;
123 //FIXME maybe move to end
124 if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID) {
126 return ff_xvid_rate_control_init(s);
128 av_log(s->avctx, AV_LOG_ERROR, "XviD ratecontrol requires libavcodec compiled with XviD support\n");
134 if(!(s->flags&CODEC_FLAG_PASS2)){
136 rcc->short_term_qsum=0.001;
137 rcc->short_term_qcount=0.001;
139 rcc->pass1_rc_eq_output_sum= 0.001;
140 rcc->pass1_wanted_bits=0.001;
142 /* init stuff with the user specified complexity */
143 if(s->avctx->rc_initial_cplx){
144 for(i=0; i<60*30; i++){
145 double bits= s->avctx->rc_initial_cplx * (i/10000.0 + 1.0)*s->mb_num;
146 RateControlEntry rce;
149 if (i%((s->gop_size+3)/4)==0) rce.pict_type= I_TYPE;
150 else if(i%(s->max_b_frames+1)) rce.pict_type= B_TYPE;
151 else rce.pict_type= P_TYPE;
153 rce.new_pict_type= rce.pict_type;
154 rce.mc_mb_var_sum= bits*s->mb_num/100000;
155 rce.mb_var_sum = s->mb_num;
156 rce.qscale = FF_QP2LAMBDA * 2;
161 if(s->pict_type== I_TYPE){
162 rce.i_count = s->mb_num;
163 rce.i_tex_bits= bits;
167 rce.i_count = 0; //FIXME we do know this approx
169 rce.p_tex_bits= bits*0.9;
170 rce.mv_bits= bits*0.1;
172 rcc->i_cplx_sum [rce.pict_type] += rce.i_tex_bits*rce.qscale;
173 rcc->p_cplx_sum [rce.pict_type] += rce.p_tex_bits*rce.qscale;
174 rcc->mv_bits_sum[rce.pict_type] += rce.mv_bits;
175 rcc->frame_count[rce.pict_type] ++;
177 bits= rce.i_tex_bits + rce.p_tex_bits;
179 q= get_qscale(s, &rce, rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum, i);
180 rcc->pass1_wanted_bits+= s->bit_rate/(1/av_q2d(s->avctx->time_base)); //FIXME missbehaves a little for variable fps
189 void ff_rate_control_uninit(MpegEncContext *s)
191 RateControlContext *rcc= &s->rc_context;
194 av_freep(&rcc->entry);
197 if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
198 ff_xvid_rate_control_uninit(s);
202 static inline double qp2bits(RateControlEntry *rce, double qp){
204 av_log(NULL, AV_LOG_ERROR, "qp<=0.0\n");
206 return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ qp;
209 static inline double bits2qp(RateControlEntry *rce, double bits){
211 av_log(NULL, AV_LOG_ERROR, "bits<0.9\n");
213 return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ bits;
216 int ff_vbv_update(MpegEncContext *s, int frame_size){
217 RateControlContext *rcc= &s->rc_context;
218 const double fps= 1/av_q2d(s->avctx->time_base);
219 const int buffer_size= s->avctx->rc_buffer_size;
220 const double min_rate= s->avctx->rc_min_rate/fps;
221 const double max_rate= s->avctx->rc_max_rate/fps;
223 //printf("%d %f %d %f %f\n", buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate);
227 rcc->buffer_index-= frame_size;
228 if(rcc->buffer_index < 0){
229 av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n");
230 rcc->buffer_index= 0;
233 left= buffer_size - rcc->buffer_index - 1;
234 rcc->buffer_index += clip(left, min_rate, max_rate);
236 if(rcc->buffer_index > buffer_size){
237 int stuffing= ceil((rcc->buffer_index - buffer_size)/8);
239 if(stuffing < 4 && s->codec_id == CODEC_ID_MPEG4)
241 rcc->buffer_index -= 8*stuffing;
243 if(s->avctx->debug & FF_DEBUG_RC)
244 av_log(s->avctx, AV_LOG_DEBUG, "stuffing %d bytes\n", stuffing);
253 * modifies the bitrate curve from pass1 for one frame
255 static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num){
256 RateControlContext *rcc= &s->rc_context;
257 AVCodecContext *a= s->avctx;
259 const int pict_type= rce->new_pict_type;
260 const double mb_num= s->mb_num;
263 double const_values[]={
266 rce->i_tex_bits*rce->qscale,
267 rce->p_tex_bits*rce->qscale,
268 (rce->i_tex_bits + rce->p_tex_bits)*(double)rce->qscale,
270 rce->pict_type == B_TYPE ? (rce->f_code + rce->b_code)*0.5 : rce->f_code,
272 rce->mc_mb_var_sum/mb_num,
273 rce->mb_var_sum/mb_num,
274 rce->pict_type == I_TYPE,
275 rce->pict_type == P_TYPE,
276 rce->pict_type == B_TYPE,
277 rcc->qscale_sum[pict_type] / (double)rcc->frame_count[pict_type],
279 /* rcc->last_qscale_for[I_TYPE],
280 rcc->last_qscale_for[P_TYPE],
281 rcc->last_qscale_for[B_TYPE],
282 rcc->next_non_b_qscale,*/
283 rcc->i_cplx_sum[I_TYPE] / (double)rcc->frame_count[I_TYPE],
284 rcc->i_cplx_sum[P_TYPE] / (double)rcc->frame_count[P_TYPE],
285 rcc->p_cplx_sum[P_TYPE] / (double)rcc->frame_count[P_TYPE],
286 rcc->p_cplx_sum[B_TYPE] / (double)rcc->frame_count[B_TYPE],
287 (rcc->i_cplx_sum[pict_type] + rcc->p_cplx_sum[pict_type]) / (double)rcc->frame_count[pict_type],
290 static const char *const_names[]={
317 static double (*func1[])(void *, double)={
322 static const char *func1_names[]={
328 bits= ff_eval(s->avctx->rc_eq, const_values, const_names, func1, func1_names, NULL, NULL, rce);
330 rcc->pass1_rc_eq_output_sum+= bits;
332 if(bits<0.0) bits=0.0;
333 bits+= 1.0; //avoid 1/0 issues
336 for(i=0; i<s->avctx->rc_override_count; i++){
337 RcOverride *rco= s->avctx->rc_override;
338 if(rco[i].start_frame > frame_num) continue;
339 if(rco[i].end_frame < frame_num) continue;
342 bits= qp2bits(rce, rco[i].qscale); //FIXME move at end to really force it?
344 bits*= rco[i].quality_factor;
347 q= bits2qp(rce, bits);
350 if (pict_type==I_TYPE && s->avctx->i_quant_factor<0.0)
351 q= -q*s->avctx->i_quant_factor + s->avctx->i_quant_offset;
352 else if(pict_type==B_TYPE && s->avctx->b_quant_factor<0.0)
353 q= -q*s->avctx->b_quant_factor + s->avctx->b_quant_offset;
358 static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q){
359 RateControlContext *rcc= &s->rc_context;
360 AVCodecContext *a= s->avctx;
361 const int pict_type= rce->new_pict_type;
362 const double last_p_q = rcc->last_qscale_for[P_TYPE];
363 const double last_non_b_q= rcc->last_qscale_for[rcc->last_non_b_pict_type];
365 if (pict_type==I_TYPE && (a->i_quant_factor>0.0 || rcc->last_non_b_pict_type==P_TYPE))
366 q= last_p_q *ABS(a->i_quant_factor) + a->i_quant_offset;
367 else if(pict_type==B_TYPE && a->b_quant_factor>0.0)
368 q= last_non_b_q* a->b_quant_factor + a->b_quant_offset;
370 /* last qscale / qdiff stuff */
371 if(rcc->last_non_b_pict_type==pict_type || pict_type!=I_TYPE){
372 double last_q= rcc->last_qscale_for[pict_type];
373 const int maxdiff= FF_QP2LAMBDA * a->max_qdiff;
375 if (q > last_q + maxdiff) q= last_q + maxdiff;
376 else if(q < last_q - maxdiff) q= last_q - maxdiff;
379 rcc->last_qscale_for[pict_type]= q; //Note we cant do that after blurring
381 if(pict_type!=B_TYPE)
382 rcc->last_non_b_pict_type= pict_type;
388 * gets the qmin & qmax for pict_type
390 static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pict_type){
391 int qmin= s->avctx->lmin;
392 int qmax= s->avctx->lmax;
394 assert(qmin <= qmax);
396 if(pict_type==B_TYPE){
397 qmin= (int)(qmin*ABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
398 qmax= (int)(qmax*ABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
399 }else if(pict_type==I_TYPE){
400 qmin= (int)(qmin*ABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
401 qmax= (int)(qmax*ABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
404 qmin= clip(qmin, 1, FF_LAMBDA_MAX);
405 qmax= clip(qmax, 1, FF_LAMBDA_MAX);
407 if(qmax<qmin) qmax= qmin;
413 static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q, int frame_num){
414 RateControlContext *rcc= &s->rc_context;
417 const int pict_type= rce->new_pict_type;
418 const double buffer_size= s->avctx->rc_buffer_size;
419 const double fps= 1/av_q2d(s->avctx->time_base);
420 const double min_rate= s->avctx->rc_min_rate / fps;
421 const double max_rate= s->avctx->rc_max_rate / fps;
423 get_qminmax(&qmin, &qmax, s, pict_type);
426 if(s->avctx->rc_qmod_freq && frame_num%s->avctx->rc_qmod_freq==0 && pict_type==P_TYPE)
427 q*= s->avctx->rc_qmod_amp;
429 bits= qp2bits(rce, q);
430 //printf("q:%f\n", q);
431 /* buffer overflow/underflow protection */
433 double expected_size= rcc->buffer_index;
437 double d= 2*(buffer_size - expected_size)/buffer_size;
439 else if(d<0.0001) d=0.0001;
440 q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
442 q_limit= bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index)*3, 1));
444 if(s->avctx->debug&FF_DEBUG_RC){
445 av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
452 double d= 2*expected_size/buffer_size;
454 else if(d<0.0001) d=0.0001;
455 q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
457 q_limit= bits2qp(rce, FFMAX(rcc->buffer_index/3, 1));
459 if(s->avctx->debug&FF_DEBUG_RC){
460 av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
466 //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);
467 if(s->avctx->rc_qsquish==0.0 || qmin==qmax){
469 else if(q>qmax) q=qmax;
471 double min2= log(qmin);
472 double max2= log(qmax);
475 q= (q - min2)/(max2-min2) - 0.5;
477 q= 1.0/(1.0 + exp(q));
478 q= q*(max2-min2) + min2;
486 //----------------------------------
489 static double predict_size(Predictor *p, double q, double var)
491 return p->coeff*var / (q*p->count);
495 static double predict_qp(Predictor *p, double size, double var)
497 //printf("coeff:%f, count:%f, var:%f, size:%f//\n", p->coeff, p->count, var, size);
498 return p->coeff*var / (size*p->count);
502 static void update_predictor(Predictor *p, double q, double var, double size)
504 double new_coeff= size*q / (var + 1);
510 p->coeff+= new_coeff;
513 static void adaptive_quantization(MpegEncContext *s, double q){
515 const float lumi_masking= s->avctx->lumi_masking / (128.0*128.0);
516 const float dark_masking= s->avctx->dark_masking / (128.0*128.0);
517 const float temp_cplx_masking= s->avctx->temporal_cplx_masking;
518 const float spatial_cplx_masking = s->avctx->spatial_cplx_masking;
519 const float p_masking = s->avctx->p_masking;
520 const float border_masking = s->avctx->border_masking;
523 float cplx_tab[s->mb_num];
524 float bits_tab[s->mb_num];
525 const int qmin= s->avctx->mb_lmin;
526 const int qmax= s->avctx->mb_lmax;
527 Picture * const pic= &s->current_picture;
528 const int mb_width = s->mb_width;
529 const int mb_height = s->mb_height;
531 for(i=0; i<s->mb_num; i++){
532 const int mb_xy= s->mb_index2xy[i];
533 float temp_cplx= sqrt(pic->mc_mb_var[mb_xy]); //FIXME merge in pow()
534 float spat_cplx= sqrt(pic->mb_var[mb_xy]);
535 const int lumi= pic->mb_mean[mb_xy];
536 float bits, cplx, factor;
537 int mb_x = mb_xy % s->mb_stride;
538 int mb_y = mb_xy / s->mb_stride;
540 float mb_factor = 0.0;
542 if(spat_cplx < q/3) spat_cplx= q/3; //FIXME finetune
543 if(temp_cplx < q/3) temp_cplx= q/3; //FIXME finetune
545 if(spat_cplx < 4) spat_cplx= 4; //FIXME finetune
546 if(temp_cplx < 4) temp_cplx= 4; //FIXME finetune
548 if((s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_INTRA)){//FIXME hq mode
550 factor= 1.0 + p_masking;
553 factor= pow(temp_cplx, - temp_cplx_masking);
555 factor*=pow(spat_cplx, - spatial_cplx_masking);
558 factor*= (1.0 - (lumi-128)*(lumi-128)*lumi_masking);
560 factor*= (1.0 - (lumi-128)*(lumi-128)*dark_masking);
562 if(mb_x < mb_width/5){
563 mb_distance = mb_width/5 - mb_x;
564 mb_factor = (float)mb_distance / (float)(mb_width/5);
565 }else if(mb_x > 4*mb_width/5){
566 mb_distance = mb_x - 4*mb_width/5;
567 mb_factor = (float)mb_distance / (float)(mb_width/5);
569 if(mb_y < mb_height/5){
570 mb_distance = mb_height/5 - mb_y;
571 mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
572 }else if(mb_y > 4*mb_height/5){
573 mb_distance = mb_y - 4*mb_height/5;
574 mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
577 factor*= 1.0 - border_masking*mb_factor;
579 if(factor<0.00001) factor= 0.00001;
588 /* handle qmin/qmax cliping */
589 if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
590 float factor= bits_sum/cplx_sum;
591 for(i=0; i<s->mb_num; i++){
592 float newq= q*cplx_tab[i]/bits_tab[i];
596 bits_sum -= bits_tab[i];
597 cplx_sum -= cplx_tab[i]*q/qmax;
599 else if(newq < qmin){
600 bits_sum -= bits_tab[i];
601 cplx_sum -= cplx_tab[i]*q/qmin;
604 if(bits_sum < 0.001) bits_sum= 0.001;
605 if(cplx_sum < 0.001) cplx_sum= 0.001;
608 for(i=0; i<s->mb_num; i++){
609 const int mb_xy= s->mb_index2xy[i];
610 float newq= q*cplx_tab[i]/bits_tab[i];
613 if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
614 newq*= bits_sum/cplx_sum;
617 intq= (int)(newq + 0.5);
619 if (intq > qmax) intq= qmax;
620 else if(intq < qmin) intq= qmin;
621 //if(i%s->mb_width==0) printf("\n");
622 //printf("%2d%3d ", intq, ff_sqrt(s->mc_mb_var[i]));
623 s->lambda_table[mb_xy]= intq;
627 void ff_get_2pass_fcode(MpegEncContext *s){
628 RateControlContext *rcc= &s->rc_context;
629 int picture_number= s->picture_number;
630 RateControlEntry *rce;
632 rce= &rcc->entry[picture_number];
633 s->f_code= rce->f_code;
634 s->b_code= rce->b_code;
637 //FIXME rd or at least approx for dquant
639 float ff_rate_estimate_qscale(MpegEncContext *s, int dry_run)
643 float br_compensation;
647 int picture_number= s->picture_number;
649 RateControlContext *rcc= &s->rc_context;
650 AVCodecContext *a= s->avctx;
651 RateControlEntry local_rce, *rce;
655 const int pict_type= s->pict_type;
656 Picture * const pic= &s->current_picture;
660 if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
661 return ff_xvid_rate_estimate_qscale(s, dry_run);
664 get_qminmax(&qmin, &qmax, s, pict_type);
666 fps= 1/av_q2d(s->avctx->time_base);
667 //printf("input_pic_num:%d pic_num:%d frame_rate:%d\n", s->input_picture_number, s->picture_number, s->frame_rate);
668 /* update predictors */
669 if(picture_number>2 && !dry_run){
670 const int last_var= s->last_pict_type == I_TYPE ? rcc->last_mb_var_sum : rcc->last_mc_mb_var_sum;
671 update_predictor(&rcc->pred[s->last_pict_type], rcc->last_qscale, sqrt(last_var), s->frame_bits);
674 if(s->flags&CODEC_FLAG_PASS2){
675 assert(picture_number>=0);
676 assert(picture_number<rcc->num_entries);
677 rce= &rcc->entry[picture_number];
678 wanted_bits= rce->expected_bits;
681 wanted_bits= (uint64_t)(s->bit_rate*(double)picture_number/fps);
684 diff= s->total_bits - wanted_bits;
685 br_compensation= (a->bit_rate_tolerance - diff)/a->bit_rate_tolerance;
686 if(br_compensation<=0.0) br_compensation=0.001;
688 var= pict_type == I_TYPE ? pic->mb_var_sum : pic->mc_mb_var_sum;
690 short_term_q = 0; /* avoid warning */
691 if(s->flags&CODEC_FLAG_PASS2){
692 if(pict_type!=I_TYPE)
693 assert(pict_type == rce->new_pict_type);
695 q= rce->new_qscale / br_compensation;
696 //printf("%f %f %f last:%d var:%d type:%d//\n", q, rce->new_qscale, br_compensation, s->frame_bits, var, pict_type);
699 rce->new_pict_type= pict_type;
700 rce->mc_mb_var_sum= pic->mc_mb_var_sum;
701 rce->mb_var_sum = pic-> mb_var_sum;
702 rce->qscale = FF_QP2LAMBDA * 2;
703 rce->f_code = s->f_code;
704 rce->b_code = s->b_code;
707 bits= predict_size(&rcc->pred[pict_type], rce->qscale, sqrt(var));
708 if(pict_type== I_TYPE){
709 rce->i_count = s->mb_num;
710 rce->i_tex_bits= bits;
714 rce->i_count = 0; //FIXME we do know this approx
716 rce->p_tex_bits= bits*0.9;
718 rce->mv_bits= bits*0.1;
720 rcc->i_cplx_sum [pict_type] += rce->i_tex_bits*rce->qscale;
721 rcc->p_cplx_sum [pict_type] += rce->p_tex_bits*rce->qscale;
722 rcc->mv_bits_sum[pict_type] += rce->mv_bits;
723 rcc->frame_count[pict_type] ++;
725 bits= rce->i_tex_bits + rce->p_tex_bits;
726 rate_factor= rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum * br_compensation;
728 q= get_qscale(s, rce, rate_factor, picture_number);
732 q= get_diff_limited_q(s, rce, q);
736 if(pict_type==P_TYPE || s->intra_only){ //FIXME type dependant blur like in 2-pass
737 rcc->short_term_qsum*=a->qblur;
738 rcc->short_term_qcount*=a->qblur;
740 rcc->short_term_qsum+= q;
741 rcc->short_term_qcount++;
743 q= short_term_q= rcc->short_term_qsum/rcc->short_term_qcount;
748 q= modify_qscale(s, rce, q, picture_number);
750 rcc->pass1_wanted_bits+= s->bit_rate/fps;
755 if(s->avctx->debug&FF_DEBUG_RC){
756 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",
757 av_get_pict_type_char(pict_type), qmin, q, qmax, picture_number, (int)wanted_bits/1000, (int)s->total_bits/1000,
758 br_compensation, short_term_q, s->frame_bits, pic->mb_var_sum, pic->mc_mb_var_sum, s->bit_rate/1000, (int)fps
763 else if(q>qmax) q=qmax;
765 if(s->adaptive_quant)
766 adaptive_quantization(s, q);
772 rcc->last_mc_mb_var_sum= pic->mc_mb_var_sum;
773 rcc->last_mb_var_sum= pic->mb_var_sum;
777 static int mvsum=0, texsum=0;
779 texsum += s->i_tex_bits + s->p_tex_bits;
780 printf("%d %d//\n\n", mvsum, texsum);
786 //----------------------------------------------
789 static int init_pass2(MpegEncContext *s)
791 RateControlContext *rcc= &s->rc_context;
792 AVCodecContext *a= s->avctx;
794 double fps= 1/av_q2d(s->avctx->time_base);
795 double complexity[5]={0,0,0,0,0}; // aproximate bits at quant=1
796 double avg_quantizer[5];
797 uint64_t const_bits[5]={0,0,0,0,0}; // quantizer idependant bits
798 uint64_t available_bits[5];
799 uint64_t all_const_bits;
800 uint64_t all_available_bits= (uint64_t)(s->bit_rate*(double)rcc->num_entries/fps);
801 double rate_factor=0;
803 //int last_i_frame=-10000000;
804 const int filter_size= (int)(a->qblur*4) | 1;
805 double expected_bits;
806 double *qscale, *blured_qscale;
808 /* find complexity & const_bits & decide the pict_types */
809 for(i=0; i<rcc->num_entries; i++){
810 RateControlEntry *rce= &rcc->entry[i];
812 rce->new_pict_type= rce->pict_type;
813 rcc->i_cplx_sum [rce->pict_type] += rce->i_tex_bits*rce->qscale;
814 rcc->p_cplx_sum [rce->pict_type] += rce->p_tex_bits*rce->qscale;
815 rcc->mv_bits_sum[rce->pict_type] += rce->mv_bits;
816 rcc->frame_count[rce->pict_type] ++;
818 complexity[rce->new_pict_type]+= (rce->i_tex_bits+ rce->p_tex_bits)*(double)rce->qscale;
819 const_bits[rce->new_pict_type]+= rce->mv_bits + rce->misc_bits;
821 all_const_bits= const_bits[I_TYPE] + const_bits[P_TYPE] + const_bits[B_TYPE];
823 if(all_available_bits < all_const_bits){
824 av_log(s->avctx, AV_LOG_ERROR, "requested bitrate is to low\n");
828 /* find average quantizers */
829 avg_quantizer[P_TYPE]=0;
830 for(step=256*256; step>0.0000001; step*=0.5){
831 double expected_bits=0;
832 avg_quantizer[P_TYPE]+= step;
834 avg_quantizer[I_TYPE]= avg_quantizer[P_TYPE]*ABS(s->avctx->i_quant_factor) + s->avctx->i_quant_offset;
835 avg_quantizer[B_TYPE]= avg_quantizer[P_TYPE]*ABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset;
839 + complexity[I_TYPE]/avg_quantizer[I_TYPE]
840 + complexity[P_TYPE]/avg_quantizer[P_TYPE]
841 + complexity[B_TYPE]/avg_quantizer[B_TYPE];
843 if(expected_bits < all_available_bits) avg_quantizer[P_TYPE]-= step;
844 //printf("%f %lld %f\n", expected_bits, all_available_bits, avg_quantizer[P_TYPE]);
846 //printf("qp_i:%f, qp_p:%f, qp_b:%f\n", avg_quantizer[I_TYPE],avg_quantizer[P_TYPE],avg_quantizer[B_TYPE]);
849 available_bits[i]= const_bits[i] + complexity[i]/avg_quantizer[i];
851 //printf("%lld %lld %lld %lld\n", available_bits[I_TYPE], available_bits[P_TYPE], available_bits[B_TYPE], all_available_bits);
853 qscale= av_malloc(sizeof(double)*rcc->num_entries);
854 blured_qscale= av_malloc(sizeof(double)*rcc->num_entries);
856 for(step=256*256; step>0.0000001; step*=0.5){
860 rcc->buffer_index= s->avctx->rc_buffer_size/2;
863 for(i=0; i<rcc->num_entries; i++){
864 qscale[i]= get_qscale(s, &rcc->entry[i], rate_factor, i);
866 assert(filter_size%2==1);
868 /* fixed I/B QP relative to P mode */
869 for(i=rcc->num_entries-1; i>=0; i--){
870 RateControlEntry *rce= &rcc->entry[i];
872 qscale[i]= get_diff_limited_q(s, rce, qscale[i]);
876 for(i=0; i<rcc->num_entries; i++){
877 RateControlEntry *rce= &rcc->entry[i];
878 const int pict_type= rce->new_pict_type;
880 double q=0.0, sum=0.0;
882 for(j=0; j<filter_size; j++){
883 int index= i+j-filter_size/2;
885 double coeff= a->qblur==0 ? 1.0 : exp(-d*d/(a->qblur * a->qblur));
887 if(index < 0 || index >= rcc->num_entries) continue;
888 if(pict_type != rcc->entry[index].new_pict_type) continue;
889 q+= qscale[index] * coeff;
892 blured_qscale[i]= q/sum;
895 /* find expected bits */
896 for(i=0; i<rcc->num_entries; i++){
897 RateControlEntry *rce= &rcc->entry[i];
899 rce->new_qscale= modify_qscale(s, rce, blured_qscale[i], i);
900 bits= qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits;
901 //printf("%d %f\n", rce->new_bits, blured_qscale[i]);
902 bits += 8*ff_vbv_update(s, bits);
904 rce->expected_bits= expected_bits;
905 expected_bits += bits;
908 // printf("%f %d %f\n", expected_bits, (int)all_available_bits, rate_factor);
909 if(expected_bits > all_available_bits) rate_factor-= step;
912 av_free(blured_qscale);
914 if(abs(expected_bits/all_available_bits - 1.0) > 0.01 ){
915 av_log(s->avctx, AV_LOG_ERROR, "Error: 2pass curve failed to converge\n");