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 // Always 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 static inline double qp2bits(RateControlEntry *rce, double qp){
53 av_log(NULL, AV_LOG_ERROR, "qp<=0.0\n");
55 return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ qp;
58 static inline double bits2qp(RateControlEntry *rce, double bits){
60 av_log(NULL, AV_LOG_ERROR, "bits<0.9\n");
62 return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ bits;
65 int ff_rate_control_init(MpegEncContext *s)
67 RateControlContext *rcc= &s->rc_context;
70 static const char *const_names[]={
97 static double (*func1[])(void *, double)={
102 static const char *func1_names[]={
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 : "");
116 rcc->pred[i].coeff= FF_QP2LAMBDA * 7.0;
117 rcc->pred[i].count= 1.0;
119 rcc->pred[i].decay= 0.4;
124 rcc->frame_count[i]= 1; // 1 is better cuz of 1/0 and such
125 rcc->last_qscale_for[i]=FF_QP2LAMBDA * 5;
127 rcc->buffer_index= s->avctx->rc_initial_buffer_occupancy;
129 if(s->flags&CODEC_FLAG_PASS2){
133 /* find number of pics */
134 p= s->avctx->stats_in;
139 if(i<=0 || i>=INT_MAX / sizeof(RateControlEntry))
141 rcc->entry = (RateControlEntry*)av_mallocz(i*sizeof(RateControlEntry));
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;
154 p= s->avctx->stats_in;
155 for(i=0; i<rcc->num_entries - s->max_b_frames; i++){
156 RateControlEntry *rce;
161 next= strchr(p, ';');
163 (*next)=0; //sscanf in unbelievably slow on looong strings //FIXME copy / do not write
166 e= sscanf(p, " in:%d ", &picture_number);
168 assert(picture_number >= 0);
169 assert(picture_number < rcc->num_entries);
170 rce= &rcc->entry[picture_number];
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);
176 av_log(s->avctx, AV_LOG_ERROR, "statistics are damaged at line %d, parser out=%d\n", i, e);
183 if(init_pass2(s) < 0) return -1;
185 //FIXME maybe move to end
186 if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID) {
187 #ifdef CONFIG_LIBXVID
188 return ff_xvid_rate_control_init(s);
190 av_log(s->avctx, AV_LOG_ERROR, "XviD ratecontrol requires libavcodec compiled with XviD support\n");
196 if(!(s->flags&CODEC_FLAG_PASS2)){
198 rcc->short_term_qsum=0.001;
199 rcc->short_term_qcount=0.001;
201 rcc->pass1_rc_eq_output_sum= 0.001;
202 rcc->pass1_wanted_bits=0.001;
204 if(s->avctx->qblur > 1.0){
205 av_log(s->avctx, AV_LOG_ERROR, "qblur too large\n");
208 /* init stuff with the user specified complexity */
209 if(s->avctx->rc_initial_cplx){
210 for(i=0; i<60*30; i++){
211 double bits= s->avctx->rc_initial_cplx * (i/10000.0 + 1.0)*s->mb_num;
212 RateControlEntry rce;
215 if (i%((s->gop_size+3)/4)==0) rce.pict_type= I_TYPE;
216 else if(i%(s->max_b_frames+1)) rce.pict_type= B_TYPE;
217 else rce.pict_type= P_TYPE;
219 rce.new_pict_type= rce.pict_type;
220 rce.mc_mb_var_sum= bits*s->mb_num/100000;
221 rce.mb_var_sum = s->mb_num;
222 rce.qscale = FF_QP2LAMBDA * 2;
227 if(s->pict_type== I_TYPE){
228 rce.i_count = s->mb_num;
229 rce.i_tex_bits= bits;
233 rce.i_count = 0; //FIXME we do know this approx
235 rce.p_tex_bits= bits*0.9;
236 rce.mv_bits= bits*0.1;
238 rcc->i_cplx_sum [rce.pict_type] += rce.i_tex_bits*rce.qscale;
239 rcc->p_cplx_sum [rce.pict_type] += rce.p_tex_bits*rce.qscale;
240 rcc->mv_bits_sum[rce.pict_type] += rce.mv_bits;
241 rcc->frame_count[rce.pict_type] ++;
243 bits= rce.i_tex_bits + rce.p_tex_bits;
245 q= get_qscale(s, &rce, rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum, i);
246 rcc->pass1_wanted_bits+= s->bit_rate/(1/av_q2d(s->avctx->time_base)); //FIXME missbehaves a little for variable fps
255 void ff_rate_control_uninit(MpegEncContext *s)
257 RateControlContext *rcc= &s->rc_context;
260 ff_eval_free(rcc->rc_eq_eval);
261 av_freep(&rcc->entry);
263 #ifdef CONFIG_LIBXVID
264 if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
265 ff_xvid_rate_control_uninit(s);
269 int ff_vbv_update(MpegEncContext *s, int frame_size){
270 RateControlContext *rcc= &s->rc_context;
271 const double fps= 1/av_q2d(s->avctx->time_base);
272 const int buffer_size= s->avctx->rc_buffer_size;
273 const double min_rate= s->avctx->rc_min_rate/fps;
274 const double max_rate= s->avctx->rc_max_rate/fps;
276 //printf("%d %f %d %f %f\n", buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate);
280 rcc->buffer_index-= frame_size;
281 if(rcc->buffer_index < 0){
282 av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n");
283 rcc->buffer_index= 0;
286 left= buffer_size - rcc->buffer_index - 1;
287 rcc->buffer_index += av_clip(left, min_rate, max_rate);
289 if(rcc->buffer_index > buffer_size){
290 int stuffing= ceil((rcc->buffer_index - buffer_size)/8);
292 if(stuffing < 4 && s->codec_id == CODEC_ID_MPEG4)
294 rcc->buffer_index -= 8*stuffing;
296 if(s->avctx->debug & FF_DEBUG_RC)
297 av_log(s->avctx, AV_LOG_DEBUG, "stuffing %d bytes\n", stuffing);
306 * modifies the bitrate curve from pass1 for one frame
308 static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num){
309 RateControlContext *rcc= &s->rc_context;
310 AVCodecContext *a= s->avctx;
312 const int pict_type= rce->new_pict_type;
313 const double mb_num= s->mb_num;
316 double const_values[]={
319 rce->i_tex_bits*rce->qscale,
320 rce->p_tex_bits*rce->qscale,
321 (rce->i_tex_bits + rce->p_tex_bits)*(double)rce->qscale,
323 rce->pict_type == B_TYPE ? (rce->f_code + rce->b_code)*0.5 : rce->f_code,
325 rce->mc_mb_var_sum/mb_num,
326 rce->mb_var_sum/mb_num,
327 rce->pict_type == I_TYPE,
328 rce->pict_type == P_TYPE,
329 rce->pict_type == B_TYPE,
330 rcc->qscale_sum[pict_type] / (double)rcc->frame_count[pict_type],
332 /* rcc->last_qscale_for[I_TYPE],
333 rcc->last_qscale_for[P_TYPE],
334 rcc->last_qscale_for[B_TYPE],
335 rcc->next_non_b_qscale,*/
336 rcc->i_cplx_sum[I_TYPE] / (double)rcc->frame_count[I_TYPE],
337 rcc->i_cplx_sum[P_TYPE] / (double)rcc->frame_count[P_TYPE],
338 rcc->p_cplx_sum[P_TYPE] / (double)rcc->frame_count[P_TYPE],
339 rcc->p_cplx_sum[B_TYPE] / (double)rcc->frame_count[B_TYPE],
340 (rcc->i_cplx_sum[pict_type] + rcc->p_cplx_sum[pict_type]) / (double)rcc->frame_count[pict_type],
344 bits= ff_parse_eval(rcc->rc_eq_eval, const_values, rce);
346 av_log(s->avctx, AV_LOG_ERROR, "Error evaluating rc_eq \"%s\"\n", s->avctx->rc_eq);
350 rcc->pass1_rc_eq_output_sum+= bits;
352 if(bits<0.0) bits=0.0;
353 bits+= 1.0; //avoid 1/0 issues
356 for(i=0; i<s->avctx->rc_override_count; i++){
357 RcOverride *rco= s->avctx->rc_override;
358 if(rco[i].start_frame > frame_num) continue;
359 if(rco[i].end_frame < frame_num) continue;
362 bits= qp2bits(rce, rco[i].qscale); //FIXME move at end to really force it?
364 bits*= rco[i].quality_factor;
367 q= bits2qp(rce, bits);
370 if (pict_type==I_TYPE && s->avctx->i_quant_factor<0.0)
371 q= -q*s->avctx->i_quant_factor + s->avctx->i_quant_offset;
372 else if(pict_type==B_TYPE && s->avctx->b_quant_factor<0.0)
373 q= -q*s->avctx->b_quant_factor + s->avctx->b_quant_offset;
378 static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q){
379 RateControlContext *rcc= &s->rc_context;
380 AVCodecContext *a= s->avctx;
381 const int pict_type= rce->new_pict_type;
382 const double last_p_q = rcc->last_qscale_for[P_TYPE];
383 const double last_non_b_q= rcc->last_qscale_for[rcc->last_non_b_pict_type];
385 if (pict_type==I_TYPE && (a->i_quant_factor>0.0 || rcc->last_non_b_pict_type==P_TYPE))
386 q= last_p_q *FFABS(a->i_quant_factor) + a->i_quant_offset;
387 else if(pict_type==B_TYPE && a->b_quant_factor>0.0)
388 q= last_non_b_q* a->b_quant_factor + a->b_quant_offset;
390 /* last qscale / qdiff stuff */
391 if(rcc->last_non_b_pict_type==pict_type || pict_type!=I_TYPE){
392 double last_q= rcc->last_qscale_for[pict_type];
393 const int maxdiff= FF_QP2LAMBDA * a->max_qdiff;
395 if (q > last_q + maxdiff) q= last_q + maxdiff;
396 else if(q < last_q - maxdiff) q= last_q - maxdiff;
399 rcc->last_qscale_for[pict_type]= q; //Note we cannot do that after blurring
401 if(pict_type!=B_TYPE)
402 rcc->last_non_b_pict_type= pict_type;
408 * gets the qmin & qmax for pict_type
410 static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pict_type){
411 int qmin= s->avctx->lmin;
412 int qmax= s->avctx->lmax;
414 assert(qmin <= qmax);
416 if(pict_type==B_TYPE){
417 qmin= (int)(qmin*FFABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
418 qmax= (int)(qmax*FFABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
419 }else if(pict_type==I_TYPE){
420 qmin= (int)(qmin*FFABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
421 qmax= (int)(qmax*FFABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
424 qmin= av_clip(qmin, 1, FF_LAMBDA_MAX);
425 qmax= av_clip(qmax, 1, FF_LAMBDA_MAX);
427 if(qmax<qmin) qmax= qmin;
433 static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q, int frame_num){
434 RateControlContext *rcc= &s->rc_context;
437 const int pict_type= rce->new_pict_type;
438 const double buffer_size= s->avctx->rc_buffer_size;
439 const double fps= 1/av_q2d(s->avctx->time_base);
440 const double min_rate= s->avctx->rc_min_rate / fps;
441 const double max_rate= s->avctx->rc_max_rate / fps;
443 get_qminmax(&qmin, &qmax, s, pict_type);
446 if(s->avctx->rc_qmod_freq && frame_num%s->avctx->rc_qmod_freq==0 && pict_type==P_TYPE)
447 q*= s->avctx->rc_qmod_amp;
449 bits= qp2bits(rce, q);
450 //printf("q:%f\n", q);
451 /* buffer overflow/underflow protection */
453 double expected_size= rcc->buffer_index;
457 double d= 2*(buffer_size - expected_size)/buffer_size;
459 else if(d<0.0001) d=0.0001;
460 q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
462 q_limit= bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index)*3, 1));
464 if(s->avctx->debug&FF_DEBUG_RC){
465 av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
472 double d= 2*expected_size/buffer_size;
474 else if(d<0.0001) d=0.0001;
475 q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
477 q_limit= bits2qp(rce, FFMAX(rcc->buffer_index/3, 1));
479 if(s->avctx->debug&FF_DEBUG_RC){
480 av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
486 //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);
487 if(s->avctx->rc_qsquish==0.0 || qmin==qmax){
489 else if(q>qmax) q=qmax;
491 double min2= log(qmin);
492 double max2= log(qmax);
495 q= (q - min2)/(max2-min2) - 0.5;
497 q= 1.0/(1.0 + exp(q));
498 q= q*(max2-min2) + min2;
506 //----------------------------------
509 static double predict_size(Predictor *p, double q, double var)
511 return p->coeff*var / (q*p->count);
515 static double predict_qp(Predictor *p, double size, double var)
517 //printf("coeff:%f, count:%f, var:%f, size:%f//\n", p->coeff, p->count, var, size);
518 return p->coeff*var / (size*p->count);
522 static void update_predictor(Predictor *p, double q, double var, double size)
524 double new_coeff= size*q / (var + 1);
530 p->coeff+= new_coeff;
533 static void adaptive_quantization(MpegEncContext *s, double q){
535 const float lumi_masking= s->avctx->lumi_masking / (128.0*128.0);
536 const float dark_masking= s->avctx->dark_masking / (128.0*128.0);
537 const float temp_cplx_masking= s->avctx->temporal_cplx_masking;
538 const float spatial_cplx_masking = s->avctx->spatial_cplx_masking;
539 const float p_masking = s->avctx->p_masking;
540 const float border_masking = s->avctx->border_masking;
543 float cplx_tab[s->mb_num];
544 float bits_tab[s->mb_num];
545 const int qmin= s->avctx->mb_lmin;
546 const int qmax= s->avctx->mb_lmax;
547 Picture * const pic= &s->current_picture;
548 const int mb_width = s->mb_width;
549 const int mb_height = s->mb_height;
551 for(i=0; i<s->mb_num; i++){
552 const int mb_xy= s->mb_index2xy[i];
553 float temp_cplx= sqrt(pic->mc_mb_var[mb_xy]); //FIXME merge in pow()
554 float spat_cplx= sqrt(pic->mb_var[mb_xy]);
555 const int lumi= pic->mb_mean[mb_xy];
556 float bits, cplx, factor;
557 int mb_x = mb_xy % s->mb_stride;
558 int mb_y = mb_xy / s->mb_stride;
560 float mb_factor = 0.0;
562 if(spat_cplx < q/3) spat_cplx= q/3; //FIXME finetune
563 if(temp_cplx < q/3) temp_cplx= q/3; //FIXME finetune
565 if(spat_cplx < 4) spat_cplx= 4; //FIXME finetune
566 if(temp_cplx < 4) temp_cplx= 4; //FIXME finetune
568 if((s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_INTRA)){//FIXME hq mode
570 factor= 1.0 + p_masking;
573 factor= pow(temp_cplx, - temp_cplx_masking);
575 factor*=pow(spat_cplx, - spatial_cplx_masking);
578 factor*= (1.0 - (lumi-128)*(lumi-128)*lumi_masking);
580 factor*= (1.0 - (lumi-128)*(lumi-128)*dark_masking);
582 if(mb_x < mb_width/5){
583 mb_distance = mb_width/5 - mb_x;
584 mb_factor = (float)mb_distance / (float)(mb_width/5);
585 }else if(mb_x > 4*mb_width/5){
586 mb_distance = mb_x - 4*mb_width/5;
587 mb_factor = (float)mb_distance / (float)(mb_width/5);
589 if(mb_y < mb_height/5){
590 mb_distance = mb_height/5 - mb_y;
591 mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
592 }else if(mb_y > 4*mb_height/5){
593 mb_distance = mb_y - 4*mb_height/5;
594 mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
597 factor*= 1.0 - border_masking*mb_factor;
599 if(factor<0.00001) factor= 0.00001;
608 /* handle qmin/qmax clipping */
609 if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
610 float factor= bits_sum/cplx_sum;
611 for(i=0; i<s->mb_num; i++){
612 float newq= q*cplx_tab[i]/bits_tab[i];
616 bits_sum -= bits_tab[i];
617 cplx_sum -= cplx_tab[i]*q/qmax;
619 else if(newq < qmin){
620 bits_sum -= bits_tab[i];
621 cplx_sum -= cplx_tab[i]*q/qmin;
624 if(bits_sum < 0.001) bits_sum= 0.001;
625 if(cplx_sum < 0.001) cplx_sum= 0.001;
628 for(i=0; i<s->mb_num; i++){
629 const int mb_xy= s->mb_index2xy[i];
630 float newq= q*cplx_tab[i]/bits_tab[i];
633 if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
634 newq*= bits_sum/cplx_sum;
637 intq= (int)(newq + 0.5);
639 if (intq > qmax) intq= qmax;
640 else if(intq < qmin) intq= qmin;
641 //if(i%s->mb_width==0) printf("\n");
642 //printf("%2d%3d ", intq, ff_sqrt(s->mc_mb_var[i]));
643 s->lambda_table[mb_xy]= intq;
647 void ff_get_2pass_fcode(MpegEncContext *s){
648 RateControlContext *rcc= &s->rc_context;
649 int picture_number= s->picture_number;
650 RateControlEntry *rce;
652 rce= &rcc->entry[picture_number];
653 s->f_code= rce->f_code;
654 s->b_code= rce->b_code;
657 //FIXME rd or at least approx for dquant
659 float ff_rate_estimate_qscale(MpegEncContext *s, int dry_run)
663 float br_compensation;
667 int picture_number= s->picture_number;
669 RateControlContext *rcc= &s->rc_context;
670 AVCodecContext *a= s->avctx;
671 RateControlEntry local_rce, *rce;
675 const int pict_type= s->pict_type;
676 Picture * const pic= &s->current_picture;
679 #ifdef CONFIG_LIBXVID
680 if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
681 return ff_xvid_rate_estimate_qscale(s, dry_run);
684 get_qminmax(&qmin, &qmax, s, pict_type);
686 fps= 1/av_q2d(s->avctx->time_base);
687 //printf("input_pic_num:%d pic_num:%d frame_rate:%d\n", s->input_picture_number, s->picture_number, s->frame_rate);
688 /* update predictors */
689 if(picture_number>2 && !dry_run){
690 const int last_var= s->last_pict_type == I_TYPE ? rcc->last_mb_var_sum : rcc->last_mc_mb_var_sum;
691 update_predictor(&rcc->pred[s->last_pict_type], rcc->last_qscale, sqrt(last_var), s->frame_bits);
694 if(s->flags&CODEC_FLAG_PASS2){
695 assert(picture_number>=0);
696 assert(picture_number<rcc->num_entries);
697 rce= &rcc->entry[picture_number];
698 wanted_bits= rce->expected_bits;
701 wanted_bits= (uint64_t)(s->bit_rate*(double)picture_number/fps);
704 diff= s->total_bits - wanted_bits;
705 br_compensation= (a->bit_rate_tolerance - diff)/a->bit_rate_tolerance;
706 if(br_compensation<=0.0) br_compensation=0.001;
708 var= pict_type == I_TYPE ? pic->mb_var_sum : pic->mc_mb_var_sum;
710 short_term_q = 0; /* avoid warning */
711 if(s->flags&CODEC_FLAG_PASS2){
712 if(pict_type!=I_TYPE)
713 assert(pict_type == rce->new_pict_type);
715 q= rce->new_qscale / br_compensation;
716 //printf("%f %f %f last:%d var:%d type:%d//\n", q, rce->new_qscale, br_compensation, s->frame_bits, var, pict_type);
719 rce->new_pict_type= pict_type;
720 rce->mc_mb_var_sum= pic->mc_mb_var_sum;
721 rce->mb_var_sum = pic-> mb_var_sum;
722 rce->qscale = FF_QP2LAMBDA * 2;
723 rce->f_code = s->f_code;
724 rce->b_code = s->b_code;
727 bits= predict_size(&rcc->pred[pict_type], rce->qscale, sqrt(var));
728 if(pict_type== I_TYPE){
729 rce->i_count = s->mb_num;
730 rce->i_tex_bits= bits;
734 rce->i_count = 0; //FIXME we do know this approx
736 rce->p_tex_bits= bits*0.9;
738 rce->mv_bits= bits*0.1;
740 rcc->i_cplx_sum [pict_type] += rce->i_tex_bits*rce->qscale;
741 rcc->p_cplx_sum [pict_type] += rce->p_tex_bits*rce->qscale;
742 rcc->mv_bits_sum[pict_type] += rce->mv_bits;
743 rcc->frame_count[pict_type] ++;
745 bits= rce->i_tex_bits + rce->p_tex_bits;
746 rate_factor= rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum * br_compensation;
748 q= get_qscale(s, rce, rate_factor, picture_number);
754 q= get_diff_limited_q(s, rce, q);
758 if(pict_type==P_TYPE || s->intra_only){ //FIXME type dependent blur like in 2-pass
759 rcc->short_term_qsum*=a->qblur;
760 rcc->short_term_qcount*=a->qblur;
762 rcc->short_term_qsum+= q;
763 rcc->short_term_qcount++;
765 q= short_term_q= rcc->short_term_qsum/rcc->short_term_qcount;
770 q= modify_qscale(s, rce, q, picture_number);
772 rcc->pass1_wanted_bits+= s->bit_rate/fps;
777 if(s->avctx->debug&FF_DEBUG_RC){
778 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",
779 av_get_pict_type_char(pict_type), qmin, q, qmax, picture_number, (int)wanted_bits/1000, (int)s->total_bits/1000,
780 br_compensation, short_term_q, s->frame_bits, pic->mb_var_sum, pic->mc_mb_var_sum, s->bit_rate/1000, (int)fps
785 else if(q>qmax) q=qmax;
787 if(s->adaptive_quant)
788 adaptive_quantization(s, q);
794 rcc->last_mc_mb_var_sum= pic->mc_mb_var_sum;
795 rcc->last_mb_var_sum= pic->mb_var_sum;
799 static int mvsum=0, texsum=0;
801 texsum += s->i_tex_bits + s->p_tex_bits;
802 printf("%d %d//\n\n", mvsum, texsum);
808 //----------------------------------------------
811 static int init_pass2(MpegEncContext *s)
813 RateControlContext *rcc= &s->rc_context;
814 AVCodecContext *a= s->avctx;
816 double fps= 1/av_q2d(s->avctx->time_base);
817 double complexity[5]={0,0,0,0,0}; // aproximate bits at quant=1
818 uint64_t const_bits[5]={0,0,0,0,0}; // quantizer independent bits
819 uint64_t all_const_bits;
820 uint64_t all_available_bits= (uint64_t)(s->bit_rate*(double)rcc->num_entries/fps);
821 double rate_factor=0;
823 //int last_i_frame=-10000000;
824 const int filter_size= (int)(a->qblur*4) | 1;
825 double expected_bits;
826 double *qscale, *blured_qscale, qscale_sum;
828 /* find complexity & const_bits & decide the pict_types */
829 for(i=0; i<rcc->num_entries; i++){
830 RateControlEntry *rce= &rcc->entry[i];
832 rce->new_pict_type= rce->pict_type;
833 rcc->i_cplx_sum [rce->pict_type] += rce->i_tex_bits*rce->qscale;
834 rcc->p_cplx_sum [rce->pict_type] += rce->p_tex_bits*rce->qscale;
835 rcc->mv_bits_sum[rce->pict_type] += rce->mv_bits;
836 rcc->frame_count[rce->pict_type] ++;
838 complexity[rce->new_pict_type]+= (rce->i_tex_bits+ rce->p_tex_bits)*(double)rce->qscale;
839 const_bits[rce->new_pict_type]+= rce->mv_bits + rce->misc_bits;
841 all_const_bits= const_bits[I_TYPE] + const_bits[P_TYPE] + const_bits[B_TYPE];
843 if(all_available_bits < all_const_bits){
844 av_log(s->avctx, AV_LOG_ERROR, "requested bitrate is too low\n");
848 qscale= av_malloc(sizeof(double)*rcc->num_entries);
849 blured_qscale= av_malloc(sizeof(double)*rcc->num_entries);
852 for(step=256*256; step>0.0000001; step*=0.5){
856 rcc->buffer_index= s->avctx->rc_buffer_size/2;
859 for(i=0; i<rcc->num_entries; i++){
860 qscale[i]= get_qscale(s, &rcc->entry[i], rate_factor, i);
862 assert(filter_size%2==1);
864 /* fixed I/B QP relative to P mode */
865 for(i=rcc->num_entries-1; i>=0; i--){
866 RateControlEntry *rce= &rcc->entry[i];
868 qscale[i]= get_diff_limited_q(s, rce, qscale[i]);
872 for(i=0; i<rcc->num_entries; i++){
873 RateControlEntry *rce= &rcc->entry[i];
874 const int pict_type= rce->new_pict_type;
876 double q=0.0, sum=0.0;
878 for(j=0; j<filter_size; j++){
879 int index= i+j-filter_size/2;
881 double coeff= a->qblur==0 ? 1.0 : exp(-d*d/(a->qblur * a->qblur));
883 if(index < 0 || index >= rcc->num_entries) continue;
884 if(pict_type != rcc->entry[index].new_pict_type) continue;
885 q+= qscale[index] * coeff;
888 blured_qscale[i]= q/sum;
891 /* find expected bits */
892 for(i=0; i<rcc->num_entries; i++){
893 RateControlEntry *rce= &rcc->entry[i];
895 rce->new_qscale= modify_qscale(s, rce, blured_qscale[i], i);
896 bits= qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits;
897 //printf("%d %f\n", rce->new_bits, blured_qscale[i]);
898 bits += 8*ff_vbv_update(s, bits);
900 rce->expected_bits= expected_bits;
901 expected_bits += bits;
905 av_log(s->avctx, AV_LOG_INFO,
906 "expected_bits: %f all_available_bits: %d rate_factor: %f\n",
907 expected_bits, (int)all_available_bits, rate_factor);
909 if(expected_bits > all_available_bits) {
915 av_free(blured_qscale);
917 /* check bitrate calculations and print info */
919 for(i=0; i<rcc->num_entries; i++){
920 /* av_log(s->avctx, AV_LOG_DEBUG, "[lavc rc] entry[%d].new_qscale = %.3f qp = %.3f\n",
921 i, rcc->entry[i].new_qscale, rcc->entry[i].new_qscale / FF_QP2LAMBDA); */
922 qscale_sum += av_clip(rcc->entry[i].new_qscale / FF_QP2LAMBDA, s->avctx->qmin, s->avctx->qmax);
924 assert(toobig <= 40);
925 av_log(s->avctx, AV_LOG_DEBUG,
926 "[lavc rc] requested bitrate: %d bps expected bitrate: %d bps\n",
928 (int)(expected_bits / ((double)all_available_bits/s->bit_rate)));
929 av_log(s->avctx, AV_LOG_DEBUG,
930 "[lavc rc] estimated target average qp: %.3f\n",
931 (float)qscale_sum / rcc->num_entries);
933 av_log(s->avctx, AV_LOG_INFO,
934 "[lavc rc] Using all of requested bitrate is not "
935 "necessary for this video with these parameters.\n");
936 } else if (toobig == 40) {
937 av_log(s->avctx, AV_LOG_ERROR,
938 "[lavc rc] Error: bitrate too low for this video "
939 "with these parameters.\n");
941 } else if (fabs(expected_bits/all_available_bits - 1.0) > 0.01) {
942 av_log(s->avctx, AV_LOG_ERROR,
943 "[lavc rc] Error: 2pass curve failed to converge\n");