2 * Rate control for video encoders
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
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.
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.
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
25 * Rate control for video encoders.
30 #include "ratecontrol.h"
31 #include "mpegvideo.h"
34 #undef NDEBUG // allways check asserts, the speed effect is far too small to disable them
38 #define M_E 2.718281828
41 static int init_pass2(MpegEncContext *s);
42 static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num);
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);
51 int ff_rate_control_init(MpegEncContext *s)
53 RateControlContext *rcc= &s->rc_context;
58 rcc->pred[i].coeff= FF_QP2LAMBDA * 7.0;
59 rcc->pred[i].count= 1.0;
61 rcc->pred[i].decay= 0.4;
66 rcc->frame_count[i]= 1; // 1 is better cuz of 1/0 and such
67 rcc->last_qscale_for[i]=FF_QP2LAMBDA * 5;
69 rcc->buffer_index= s->avctx->rc_initial_buffer_occupancy;
71 if(s->flags&CODEC_FLAG_PASS2){
75 /* find number of pics */
76 p= s->avctx->stats_in;
81 if(i<=0 || i>=INT_MAX / sizeof(RateControlEntry))
83 rcc->entry = (RateControlEntry*)av_mallocz(i*sizeof(RateControlEntry));
86 /* init all to skipped p frames (with b frames we might have a not encoded frame at the end FIXME) */
87 for(i=0; i<rcc->num_entries; i++){
88 RateControlEntry *rce= &rcc->entry[i];
89 rce->pict_type= rce->new_pict_type=P_TYPE;
90 rce->qscale= rce->new_qscale=FF_QP2LAMBDA * 2;
91 rce->misc_bits= s->mb_num + 10;
92 rce->mb_var_sum= s->mb_num*100;
96 p= s->avctx->stats_in;
97 for(i=0; i<rcc->num_entries - s->max_b_frames; i++){
98 RateControlEntry *rce;
103 next= strchr(p, ';');
105 (*next)=0; //sscanf in unbelieavle slow on looong strings //FIXME copy / dont write
108 e= sscanf(p, " in:%d ", &picture_number);
110 assert(picture_number >= 0);
111 assert(picture_number < rcc->num_entries);
112 rce= &rcc->entry[picture_number];
114 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",
115 &rce->pict_type, &rce->qscale, &rce->i_tex_bits, &rce->p_tex_bits, &rce->mv_bits, &rce->misc_bits,
116 &rce->f_code, &rce->b_code, &rce->mc_mb_var_sum, &rce->mb_var_sum, &rce->i_count, &rce->skip_count, &rce->header_bits);
118 av_log(s->avctx, AV_LOG_ERROR, "statistics are damaged at line %d, parser out=%d\n", i, e);
125 if(init_pass2(s) < 0) return -1;
127 //FIXME maybe move to end
128 if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID) {
130 return ff_xvid_rate_control_init(s);
132 av_log(s->avctx, AV_LOG_ERROR, "XviD ratecontrol requires libavcodec compiled with XviD support\n");
138 if(!(s->flags&CODEC_FLAG_PASS2)){
140 rcc->short_term_qsum=0.001;
141 rcc->short_term_qcount=0.001;
143 rcc->pass1_rc_eq_output_sum= 0.001;
144 rcc->pass1_wanted_bits=0.001;
146 /* init stuff with the user specified complexity */
147 if(s->avctx->rc_initial_cplx){
148 for(i=0; i<60*30; i++){
149 double bits= s->avctx->rc_initial_cplx * (i/10000.0 + 1.0)*s->mb_num;
150 RateControlEntry rce;
153 if (i%((s->gop_size+3)/4)==0) rce.pict_type= I_TYPE;
154 else if(i%(s->max_b_frames+1)) rce.pict_type= B_TYPE;
155 else rce.pict_type= P_TYPE;
157 rce.new_pict_type= rce.pict_type;
158 rce.mc_mb_var_sum= bits*s->mb_num/100000;
159 rce.mb_var_sum = s->mb_num;
160 rce.qscale = FF_QP2LAMBDA * 2;
165 if(s->pict_type== I_TYPE){
166 rce.i_count = s->mb_num;
167 rce.i_tex_bits= bits;
171 rce.i_count = 0; //FIXME we do know this approx
173 rce.p_tex_bits= bits*0.9;
174 rce.mv_bits= bits*0.1;
176 rcc->i_cplx_sum [rce.pict_type] += rce.i_tex_bits*rce.qscale;
177 rcc->p_cplx_sum [rce.pict_type] += rce.p_tex_bits*rce.qscale;
178 rcc->mv_bits_sum[rce.pict_type] += rce.mv_bits;
179 rcc->frame_count[rce.pict_type] ++;
181 bits= rce.i_tex_bits + rce.p_tex_bits;
183 q= get_qscale(s, &rce, rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum, i);
184 rcc->pass1_wanted_bits+= s->bit_rate/(1/av_q2d(s->avctx->time_base)); //FIXME missbehaves a little for variable fps
193 void ff_rate_control_uninit(MpegEncContext *s)
195 RateControlContext *rcc= &s->rc_context;
198 av_freep(&rcc->entry);
201 if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
202 ff_xvid_rate_control_uninit(s);
206 static inline double qp2bits(RateControlEntry *rce, double qp){
208 av_log(NULL, AV_LOG_ERROR, "qp<=0.0\n");
210 return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ qp;
213 static inline double bits2qp(RateControlEntry *rce, double bits){
215 av_log(NULL, AV_LOG_ERROR, "bits<0.9\n");
217 return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ bits;
220 int ff_vbv_update(MpegEncContext *s, int frame_size){
221 RateControlContext *rcc= &s->rc_context;
222 const double fps= 1/av_q2d(s->avctx->time_base);
223 const int buffer_size= s->avctx->rc_buffer_size;
224 const double min_rate= s->avctx->rc_min_rate/fps;
225 const double max_rate= s->avctx->rc_max_rate/fps;
227 //printf("%d %f %d %f %f\n", buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate);
231 rcc->buffer_index-= frame_size;
232 if(rcc->buffer_index < 0){
233 av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n");
234 rcc->buffer_index= 0;
237 left= buffer_size - rcc->buffer_index - 1;
238 rcc->buffer_index += clip(left, min_rate, max_rate);
240 if(rcc->buffer_index > buffer_size){
241 int stuffing= ceil((rcc->buffer_index - buffer_size)/8);
243 if(stuffing < 4 && s->codec_id == CODEC_ID_MPEG4)
245 rcc->buffer_index -= 8*stuffing;
247 if(s->avctx->debug & FF_DEBUG_RC)
248 av_log(s->avctx, AV_LOG_DEBUG, "stuffing %d bytes\n", stuffing);
257 * modifies the bitrate curve from pass1 for one frame
259 static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num){
260 RateControlContext *rcc= &s->rc_context;
261 AVCodecContext *a= s->avctx;
263 const int pict_type= rce->new_pict_type;
264 const double mb_num= s->mb_num;
268 double const_values[]={
271 rce->i_tex_bits*rce->qscale,
272 rce->p_tex_bits*rce->qscale,
273 (rce->i_tex_bits + rce->p_tex_bits)*(double)rce->qscale,
275 rce->pict_type == B_TYPE ? (rce->f_code + rce->b_code)*0.5 : rce->f_code,
277 rce->mc_mb_var_sum/mb_num,
278 rce->mb_var_sum/mb_num,
279 rce->pict_type == I_TYPE,
280 rce->pict_type == P_TYPE,
281 rce->pict_type == B_TYPE,
282 rcc->qscale_sum[pict_type] / (double)rcc->frame_count[pict_type],
284 /* rcc->last_qscale_for[I_TYPE],
285 rcc->last_qscale_for[P_TYPE],
286 rcc->last_qscale_for[B_TYPE],
287 rcc->next_non_b_qscale,*/
288 rcc->i_cplx_sum[I_TYPE] / (double)rcc->frame_count[I_TYPE],
289 rcc->i_cplx_sum[P_TYPE] / (double)rcc->frame_count[P_TYPE],
290 rcc->p_cplx_sum[P_TYPE] / (double)rcc->frame_count[P_TYPE],
291 rcc->p_cplx_sum[B_TYPE] / (double)rcc->frame_count[B_TYPE],
292 (rcc->i_cplx_sum[pict_type] + rcc->p_cplx_sum[pict_type]) / (double)rcc->frame_count[pict_type],
295 static const char *const_names[]={
322 static double (*func1[])(void *, double)={
327 static const char *func1_names[]={
333 bits= ff_eval2(s->avctx->rc_eq, const_values, const_names, func1, func1_names, NULL, NULL, rce, &error);
335 av_log(s->avctx, AV_LOG_ERROR, "Error evaluating rc_eq \"%s\": %s\n", s->avctx->rc_eq, error? error : "");
339 rcc->pass1_rc_eq_output_sum+= bits;
341 if(bits<0.0) bits=0.0;
342 bits+= 1.0; //avoid 1/0 issues
345 for(i=0; i<s->avctx->rc_override_count; i++){
346 RcOverride *rco= s->avctx->rc_override;
347 if(rco[i].start_frame > frame_num) continue;
348 if(rco[i].end_frame < frame_num) continue;
351 bits= qp2bits(rce, rco[i].qscale); //FIXME move at end to really force it?
353 bits*= rco[i].quality_factor;
356 q= bits2qp(rce, bits);
359 if (pict_type==I_TYPE && s->avctx->i_quant_factor<0.0)
360 q= -q*s->avctx->i_quant_factor + s->avctx->i_quant_offset;
361 else if(pict_type==B_TYPE && s->avctx->b_quant_factor<0.0)
362 q= -q*s->avctx->b_quant_factor + s->avctx->b_quant_offset;
367 static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q){
368 RateControlContext *rcc= &s->rc_context;
369 AVCodecContext *a= s->avctx;
370 const int pict_type= rce->new_pict_type;
371 const double last_p_q = rcc->last_qscale_for[P_TYPE];
372 const double last_non_b_q= rcc->last_qscale_for[rcc->last_non_b_pict_type];
374 if (pict_type==I_TYPE && (a->i_quant_factor>0.0 || rcc->last_non_b_pict_type==P_TYPE))
375 q= last_p_q *ABS(a->i_quant_factor) + a->i_quant_offset;
376 else if(pict_type==B_TYPE && a->b_quant_factor>0.0)
377 q= last_non_b_q* a->b_quant_factor + a->b_quant_offset;
379 /* last qscale / qdiff stuff */
380 if(rcc->last_non_b_pict_type==pict_type || pict_type!=I_TYPE){
381 double last_q= rcc->last_qscale_for[pict_type];
382 const int maxdiff= FF_QP2LAMBDA * a->max_qdiff;
384 if (q > last_q + maxdiff) q= last_q + maxdiff;
385 else if(q < last_q - maxdiff) q= last_q - maxdiff;
388 rcc->last_qscale_for[pict_type]= q; //Note we cant do that after blurring
390 if(pict_type!=B_TYPE)
391 rcc->last_non_b_pict_type= pict_type;
397 * gets the qmin & qmax for pict_type
399 static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pict_type){
400 int qmin= s->avctx->lmin;
401 int qmax= s->avctx->lmax;
403 assert(qmin <= qmax);
405 if(pict_type==B_TYPE){
406 qmin= (int)(qmin*ABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
407 qmax= (int)(qmax*ABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
408 }else if(pict_type==I_TYPE){
409 qmin= (int)(qmin*ABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
410 qmax= (int)(qmax*ABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
413 qmin= clip(qmin, 1, FF_LAMBDA_MAX);
414 qmax= clip(qmax, 1, FF_LAMBDA_MAX);
416 if(qmax<qmin) qmax= qmin;
422 static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q, int frame_num){
423 RateControlContext *rcc= &s->rc_context;
426 const int pict_type= rce->new_pict_type;
427 const double buffer_size= s->avctx->rc_buffer_size;
428 const double fps= 1/av_q2d(s->avctx->time_base);
429 const double min_rate= s->avctx->rc_min_rate / fps;
430 const double max_rate= s->avctx->rc_max_rate / fps;
432 get_qminmax(&qmin, &qmax, s, pict_type);
435 if(s->avctx->rc_qmod_freq && frame_num%s->avctx->rc_qmod_freq==0 && pict_type==P_TYPE)
436 q*= s->avctx->rc_qmod_amp;
438 bits= qp2bits(rce, q);
439 //printf("q:%f\n", q);
440 /* buffer overflow/underflow protection */
442 double expected_size= rcc->buffer_index;
446 double d= 2*(buffer_size - expected_size)/buffer_size;
448 else if(d<0.0001) d=0.0001;
449 q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
451 q_limit= bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index)*3, 1));
453 if(s->avctx->debug&FF_DEBUG_RC){
454 av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
461 double d= 2*expected_size/buffer_size;
463 else if(d<0.0001) d=0.0001;
464 q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
466 q_limit= bits2qp(rce, FFMAX(rcc->buffer_index/3, 1));
468 if(s->avctx->debug&FF_DEBUG_RC){
469 av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
475 //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);
476 if(s->avctx->rc_qsquish==0.0 || qmin==qmax){
478 else if(q>qmax) q=qmax;
480 double min2= log(qmin);
481 double max2= log(qmax);
484 q= (q - min2)/(max2-min2) - 0.5;
486 q= 1.0/(1.0 + exp(q));
487 q= q*(max2-min2) + min2;
495 //----------------------------------
498 static double predict_size(Predictor *p, double q, double var)
500 return p->coeff*var / (q*p->count);
504 static double predict_qp(Predictor *p, double size, double var)
506 //printf("coeff:%f, count:%f, var:%f, size:%f//\n", p->coeff, p->count, var, size);
507 return p->coeff*var / (size*p->count);
511 static void update_predictor(Predictor *p, double q, double var, double size)
513 double new_coeff= size*q / (var + 1);
519 p->coeff+= new_coeff;
522 static void adaptive_quantization(MpegEncContext *s, double q){
524 const float lumi_masking= s->avctx->lumi_masking / (128.0*128.0);
525 const float dark_masking= s->avctx->dark_masking / (128.0*128.0);
526 const float temp_cplx_masking= s->avctx->temporal_cplx_masking;
527 const float spatial_cplx_masking = s->avctx->spatial_cplx_masking;
528 const float p_masking = s->avctx->p_masking;
529 const float border_masking = s->avctx->border_masking;
532 float cplx_tab[s->mb_num];
533 float bits_tab[s->mb_num];
534 const int qmin= s->avctx->mb_lmin;
535 const int qmax= s->avctx->mb_lmax;
536 Picture * const pic= &s->current_picture;
537 const int mb_width = s->mb_width;
538 const int mb_height = s->mb_height;
540 for(i=0; i<s->mb_num; i++){
541 const int mb_xy= s->mb_index2xy[i];
542 float temp_cplx= sqrt(pic->mc_mb_var[mb_xy]); //FIXME merge in pow()
543 float spat_cplx= sqrt(pic->mb_var[mb_xy]);
544 const int lumi= pic->mb_mean[mb_xy];
545 float bits, cplx, factor;
546 int mb_x = mb_xy % s->mb_stride;
547 int mb_y = mb_xy / s->mb_stride;
549 float mb_factor = 0.0;
551 if(spat_cplx < q/3) spat_cplx= q/3; //FIXME finetune
552 if(temp_cplx < q/3) temp_cplx= q/3; //FIXME finetune
554 if(spat_cplx < 4) spat_cplx= 4; //FIXME finetune
555 if(temp_cplx < 4) temp_cplx= 4; //FIXME finetune
557 if((s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_INTRA)){//FIXME hq mode
559 factor= 1.0 + p_masking;
562 factor= pow(temp_cplx, - temp_cplx_masking);
564 factor*=pow(spat_cplx, - spatial_cplx_masking);
567 factor*= (1.0 - (lumi-128)*(lumi-128)*lumi_masking);
569 factor*= (1.0 - (lumi-128)*(lumi-128)*dark_masking);
571 if(mb_x < mb_width/5){
572 mb_distance = mb_width/5 - mb_x;
573 mb_factor = (float)mb_distance / (float)(mb_width/5);
574 }else if(mb_x > 4*mb_width/5){
575 mb_distance = mb_x - 4*mb_width/5;
576 mb_factor = (float)mb_distance / (float)(mb_width/5);
578 if(mb_y < mb_height/5){
579 mb_distance = mb_height/5 - mb_y;
580 mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
581 }else if(mb_y > 4*mb_height/5){
582 mb_distance = mb_y - 4*mb_height/5;
583 mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
586 factor*= 1.0 - border_masking*mb_factor;
588 if(factor<0.00001) factor= 0.00001;
597 /* handle qmin/qmax cliping */
598 if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
599 float factor= bits_sum/cplx_sum;
600 for(i=0; i<s->mb_num; i++){
601 float newq= q*cplx_tab[i]/bits_tab[i];
605 bits_sum -= bits_tab[i];
606 cplx_sum -= cplx_tab[i]*q/qmax;
608 else if(newq < qmin){
609 bits_sum -= bits_tab[i];
610 cplx_sum -= cplx_tab[i]*q/qmin;
613 if(bits_sum < 0.001) bits_sum= 0.001;
614 if(cplx_sum < 0.001) cplx_sum= 0.001;
617 for(i=0; i<s->mb_num; i++){
618 const int mb_xy= s->mb_index2xy[i];
619 float newq= q*cplx_tab[i]/bits_tab[i];
622 if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
623 newq*= bits_sum/cplx_sum;
626 intq= (int)(newq + 0.5);
628 if (intq > qmax) intq= qmax;
629 else if(intq < qmin) intq= qmin;
630 //if(i%s->mb_width==0) printf("\n");
631 //printf("%2d%3d ", intq, ff_sqrt(s->mc_mb_var[i]));
632 s->lambda_table[mb_xy]= intq;
636 void ff_get_2pass_fcode(MpegEncContext *s){
637 RateControlContext *rcc= &s->rc_context;
638 int picture_number= s->picture_number;
639 RateControlEntry *rce;
641 rce= &rcc->entry[picture_number];
642 s->f_code= rce->f_code;
643 s->b_code= rce->b_code;
646 //FIXME rd or at least approx for dquant
648 float ff_rate_estimate_qscale(MpegEncContext *s, int dry_run)
652 float br_compensation;
656 int picture_number= s->picture_number;
658 RateControlContext *rcc= &s->rc_context;
659 AVCodecContext *a= s->avctx;
660 RateControlEntry local_rce, *rce;
664 const int pict_type= s->pict_type;
665 Picture * const pic= &s->current_picture;
669 if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
670 return ff_xvid_rate_estimate_qscale(s, dry_run);
673 get_qminmax(&qmin, &qmax, s, pict_type);
675 fps= 1/av_q2d(s->avctx->time_base);
676 //printf("input_pic_num:%d pic_num:%d frame_rate:%d\n", s->input_picture_number, s->picture_number, s->frame_rate);
677 /* update predictors */
678 if(picture_number>2 && !dry_run){
679 const int last_var= s->last_pict_type == I_TYPE ? rcc->last_mb_var_sum : rcc->last_mc_mb_var_sum;
680 update_predictor(&rcc->pred[s->last_pict_type], rcc->last_qscale, sqrt(last_var), s->frame_bits);
683 if(s->flags&CODEC_FLAG_PASS2){
684 assert(picture_number>=0);
685 assert(picture_number<rcc->num_entries);
686 rce= &rcc->entry[picture_number];
687 wanted_bits= rce->expected_bits;
690 wanted_bits= (uint64_t)(s->bit_rate*(double)picture_number/fps);
693 diff= s->total_bits - wanted_bits;
694 br_compensation= (a->bit_rate_tolerance - diff)/a->bit_rate_tolerance;
695 if(br_compensation<=0.0) br_compensation=0.001;
697 var= pict_type == I_TYPE ? pic->mb_var_sum : pic->mc_mb_var_sum;
699 short_term_q = 0; /* avoid warning */
700 if(s->flags&CODEC_FLAG_PASS2){
701 if(pict_type!=I_TYPE)
702 assert(pict_type == rce->new_pict_type);
704 q= rce->new_qscale / br_compensation;
705 //printf("%f %f %f last:%d var:%d type:%d//\n", q, rce->new_qscale, br_compensation, s->frame_bits, var, pict_type);
708 rce->new_pict_type= pict_type;
709 rce->mc_mb_var_sum= pic->mc_mb_var_sum;
710 rce->mb_var_sum = pic-> mb_var_sum;
711 rce->qscale = FF_QP2LAMBDA * 2;
712 rce->f_code = s->f_code;
713 rce->b_code = s->b_code;
716 bits= predict_size(&rcc->pred[pict_type], rce->qscale, sqrt(var));
717 if(pict_type== I_TYPE){
718 rce->i_count = s->mb_num;
719 rce->i_tex_bits= bits;
723 rce->i_count = 0; //FIXME we do know this approx
725 rce->p_tex_bits= bits*0.9;
727 rce->mv_bits= bits*0.1;
729 rcc->i_cplx_sum [pict_type] += rce->i_tex_bits*rce->qscale;
730 rcc->p_cplx_sum [pict_type] += rce->p_tex_bits*rce->qscale;
731 rcc->mv_bits_sum[pict_type] += rce->mv_bits;
732 rcc->frame_count[pict_type] ++;
734 bits= rce->i_tex_bits + rce->p_tex_bits;
735 rate_factor= rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum * br_compensation;
737 q= get_qscale(s, rce, rate_factor, picture_number);
743 q= get_diff_limited_q(s, rce, q);
747 if(pict_type==P_TYPE || s->intra_only){ //FIXME type dependant blur like in 2-pass
748 rcc->short_term_qsum*=a->qblur;
749 rcc->short_term_qcount*=a->qblur;
751 rcc->short_term_qsum+= q;
752 rcc->short_term_qcount++;
754 q= short_term_q= rcc->short_term_qsum/rcc->short_term_qcount;
759 q= modify_qscale(s, rce, q, picture_number);
761 rcc->pass1_wanted_bits+= s->bit_rate/fps;
766 if(s->avctx->debug&FF_DEBUG_RC){
767 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",
768 av_get_pict_type_char(pict_type), qmin, q, qmax, picture_number, (int)wanted_bits/1000, (int)s->total_bits/1000,
769 br_compensation, short_term_q, s->frame_bits, pic->mb_var_sum, pic->mc_mb_var_sum, s->bit_rate/1000, (int)fps
774 else if(q>qmax) q=qmax;
776 if(s->adaptive_quant)
777 adaptive_quantization(s, q);
783 rcc->last_mc_mb_var_sum= pic->mc_mb_var_sum;
784 rcc->last_mb_var_sum= pic->mb_var_sum;
788 static int mvsum=0, texsum=0;
790 texsum += s->i_tex_bits + s->p_tex_bits;
791 printf("%d %d//\n\n", mvsum, texsum);
797 //----------------------------------------------
800 static int init_pass2(MpegEncContext *s)
802 RateControlContext *rcc= &s->rc_context;
803 AVCodecContext *a= s->avctx;
805 double fps= 1/av_q2d(s->avctx->time_base);
806 double complexity[5]={0,0,0,0,0}; // aproximate bits at quant=1
807 uint64_t const_bits[5]={0,0,0,0,0}; // quantizer idependant bits
808 uint64_t all_const_bits;
809 uint64_t all_available_bits= (uint64_t)(s->bit_rate*(double)rcc->num_entries/fps);
810 double rate_factor=0;
812 //int last_i_frame=-10000000;
813 const int filter_size= (int)(a->qblur*4) | 1;
814 double expected_bits;
815 double *qscale, *blured_qscale, qscale_sum;
817 /* find complexity & const_bits & decide the pict_types */
818 for(i=0; i<rcc->num_entries; i++){
819 RateControlEntry *rce= &rcc->entry[i];
821 rce->new_pict_type= rce->pict_type;
822 rcc->i_cplx_sum [rce->pict_type] += rce->i_tex_bits*rce->qscale;
823 rcc->p_cplx_sum [rce->pict_type] += rce->p_tex_bits*rce->qscale;
824 rcc->mv_bits_sum[rce->pict_type] += rce->mv_bits;
825 rcc->frame_count[rce->pict_type] ++;
827 complexity[rce->new_pict_type]+= (rce->i_tex_bits+ rce->p_tex_bits)*(double)rce->qscale;
828 const_bits[rce->new_pict_type]+= rce->mv_bits + rce->misc_bits;
830 all_const_bits= const_bits[I_TYPE] + const_bits[P_TYPE] + const_bits[B_TYPE];
832 if(all_available_bits < all_const_bits){
833 av_log(s->avctx, AV_LOG_ERROR, "requested bitrate is too low\n");
837 qscale= av_malloc(sizeof(double)*rcc->num_entries);
838 blured_qscale= av_malloc(sizeof(double)*rcc->num_entries);
841 for(step=256*256; step>0.0000001; step*=0.5){
845 rcc->buffer_index= s->avctx->rc_buffer_size/2;
848 for(i=0; i<rcc->num_entries; i++){
849 qscale[i]= get_qscale(s, &rcc->entry[i], rate_factor, i);
851 assert(filter_size%2==1);
853 /* fixed I/B QP relative to P mode */
854 for(i=rcc->num_entries-1; i>=0; i--){
855 RateControlEntry *rce= &rcc->entry[i];
857 qscale[i]= get_diff_limited_q(s, rce, qscale[i]);
861 for(i=0; i<rcc->num_entries; i++){
862 RateControlEntry *rce= &rcc->entry[i];
863 const int pict_type= rce->new_pict_type;
865 double q=0.0, sum=0.0;
867 for(j=0; j<filter_size; j++){
868 int index= i+j-filter_size/2;
870 double coeff= a->qblur==0 ? 1.0 : exp(-d*d/(a->qblur * a->qblur));
872 if(index < 0 || index >= rcc->num_entries) continue;
873 if(pict_type != rcc->entry[index].new_pict_type) continue;
874 q+= qscale[index] * coeff;
877 blured_qscale[i]= q/sum;
880 /* find expected bits */
881 for(i=0; i<rcc->num_entries; i++){
882 RateControlEntry *rce= &rcc->entry[i];
884 rce->new_qscale= modify_qscale(s, rce, blured_qscale[i], i);
885 bits= qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits;
886 //printf("%d %f\n", rce->new_bits, blured_qscale[i]);
887 bits += 8*ff_vbv_update(s, bits);
889 rce->expected_bits= expected_bits;
890 expected_bits += bits;
894 av_log(s->avctx, AV_LOG_INFO,
895 "expected_bits: %f all_available_bits: %d rate_factor: %f\n",
896 expected_bits, (int)all_available_bits, rate_factor);
898 if(expected_bits > all_available_bits) {
904 av_free(blured_qscale);
906 /* check bitrate calculations and print info */
908 for(i=0; i<rcc->num_entries; i++){
909 /* av_log(s->avctx, AV_LOG_DEBUG, "[lavc rc] entry[%d].new_qscale = %.3f qp = %.3f\n",
910 i, rcc->entry[i].new_qscale, rcc->entry[i].new_qscale / FF_QP2LAMBDA); */
911 qscale_sum += clip(rcc->entry[i].new_qscale / FF_QP2LAMBDA, s->avctx->qmin, s->avctx->qmax);
913 assert(toobig <= 40);
914 av_log(s->avctx, AV_LOG_DEBUG,
915 "[lavc rc] requested bitrate: %d bps expected bitrate: %d bps\n",
917 (int)(expected_bits / ((double)all_available_bits/s->bit_rate)));
918 av_log(s->avctx, AV_LOG_DEBUG,
919 "[lavc rc] estimated target average qp: %.3f\n",
920 (float)qscale_sum / rcc->num_entries);
922 av_log(s->avctx, AV_LOG_INFO,
923 "[lavc rc] Using all of requested bitrate is not "
924 "necessary for this video with these parameters.\n");
925 } else if (toobig == 40) {
926 av_log(s->avctx, AV_LOG_ERROR,
927 "[lavc rc] Error: bitrate too low for this video "
928 "with these parameters.\n");
930 } else if (fabs(expected_bits/all_available_bits - 1.0) > 0.01) {
931 av_log(s->avctx, AV_LOG_ERROR,
932 "[lavc rc] Error: 2pass curve failed to converge\n");