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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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;\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);
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",
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);
114 av_log(s->avctx, AV_LOG_ERROR, "statistics are damaged at line %d, parser out=%d\n", i, e);
120 if(init_pass2(s) < 0) return -1;
123 if(!(s->flags&CODEC_FLAG_PASS2)){
125 rcc->short_term_qsum=0.001;
126 rcc->short_term_qcount=0.001;
128 rcc->pass1_rc_eq_output_sum= 0.001;
129 rcc->pass1_wanted_bits=0.001;
131 /* init stuff with the user specified complexity */
132 if(s->avctx->rc_initial_cplx){
133 for(i=0; i<60*30; i++){
134 double bits= s->avctx->rc_initial_cplx * (i/10000.0 + 1.0)*s->mb_num;
135 RateControlEntry rce;
138 if (i%((s->gop_size+3)/4)==0) rce.pict_type= I_TYPE;
139 else if(i%(s->max_b_frames+1)) rce.pict_type= B_TYPE;
140 else rce.pict_type= P_TYPE;
142 rce.new_pict_type= rce.pict_type;
143 rce.mc_mb_var_sum= bits*s->mb_num/100000;
144 rce.mb_var_sum = s->mb_num;
145 rce.qscale = FF_QP2LAMBDA * 2;
150 if(s->pict_type== I_TYPE){
151 rce.i_count = s->mb_num;
152 rce.i_tex_bits= bits;
156 rce.i_count = 0; //FIXME we do know this approx
158 rce.p_tex_bits= bits*0.9;
159 rce.mv_bits= bits*0.1;
161 rcc->i_cplx_sum [rce.pict_type] += rce.i_tex_bits*rce.qscale;
162 rcc->p_cplx_sum [rce.pict_type] += rce.p_tex_bits*rce.qscale;
163 rcc->mv_bits_sum[rce.pict_type] += rce.mv_bits;
164 rcc->frame_count[rce.pict_type] ++;
166 bits= rce.i_tex_bits + rce.p_tex_bits;
168 q= get_qscale(s, &rce, rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum, i);
169 rcc->pass1_wanted_bits+= s->bit_rate/(1/av_q2d(s->avctx->time_base)); //FIXME missbehaves a little for variable fps
178 void ff_rate_control_uninit(MpegEncContext *s)
180 RateControlContext *rcc= &s->rc_context;
183 av_freep(&rcc->entry);
186 static inline double qp2bits(RateControlEntry *rce, double qp){
188 av_log(NULL, AV_LOG_ERROR, "qp<=0.0\n");
190 return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ qp;
193 static inline double bits2qp(RateControlEntry *rce, double bits){
195 av_log(NULL, AV_LOG_ERROR, "bits<0.9\n");
197 return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ bits;
200 int ff_vbv_update(MpegEncContext *s, int frame_size){
201 RateControlContext *rcc= &s->rc_context;
202 const double fps= 1/av_q2d(s->avctx->time_base);
203 const int buffer_size= s->avctx->rc_buffer_size;
204 const double min_rate= s->avctx->rc_min_rate/fps;
205 const double max_rate= s->avctx->rc_max_rate/fps;
207 //printf("%d %f %d %f %f\n", buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate);
211 rcc->buffer_index-= frame_size;
212 if(rcc->buffer_index < 0){
213 av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n");
214 rcc->buffer_index= 0;
217 left= buffer_size - rcc->buffer_index - 1;
218 rcc->buffer_index += clip(left, min_rate, max_rate);
220 if(rcc->buffer_index > buffer_size){
221 int stuffing= ceil((rcc->buffer_index - buffer_size)/8);
223 if(stuffing < 4 && s->codec_id == CODEC_ID_MPEG4)
225 rcc->buffer_index -= 8*stuffing;
227 if(s->avctx->debug & FF_DEBUG_RC)
228 av_log(s->avctx, AV_LOG_DEBUG, "stuffing %d bytes\n", stuffing);
237 * modifies the bitrate curve from pass1 for one frame
239 static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num){
240 RateControlContext *rcc= &s->rc_context;
241 AVCodecContext *a= s->avctx;
243 const int pict_type= rce->new_pict_type;
244 const double mb_num= s->mb_num;
247 double const_values[]={
250 rce->i_tex_bits*rce->qscale,
251 rce->p_tex_bits*rce->qscale,
252 (rce->i_tex_bits + rce->p_tex_bits)*(double)rce->qscale,
254 rce->pict_type == B_TYPE ? (rce->f_code + rce->b_code)*0.5 : rce->f_code,
256 rce->mc_mb_var_sum/mb_num,
257 rce->mb_var_sum/mb_num,
258 rce->pict_type == I_TYPE,
259 rce->pict_type == P_TYPE,
260 rce->pict_type == B_TYPE,
261 rcc->qscale_sum[pict_type] / (double)rcc->frame_count[pict_type],
263 /* rcc->last_qscale_for[I_TYPE],
264 rcc->last_qscale_for[P_TYPE],
265 rcc->last_qscale_for[B_TYPE],
266 rcc->next_non_b_qscale,*/
267 rcc->i_cplx_sum[I_TYPE] / (double)rcc->frame_count[I_TYPE],
268 rcc->i_cplx_sum[P_TYPE] / (double)rcc->frame_count[P_TYPE],
269 rcc->p_cplx_sum[P_TYPE] / (double)rcc->frame_count[P_TYPE],
270 rcc->p_cplx_sum[B_TYPE] / (double)rcc->frame_count[B_TYPE],
271 (rcc->i_cplx_sum[pict_type] + rcc->p_cplx_sum[pict_type]) / (double)rcc->frame_count[pict_type],
274 static const char *const_names[]={
301 static double (*func1[])(void *, double)={
306 static const char *func1_names[]={
312 bits= ff_eval(s->avctx->rc_eq, const_values, const_names, func1, func1_names, NULL, NULL, rce);
314 rcc->pass1_rc_eq_output_sum+= bits;
316 if(bits<0.0) bits=0.0;
317 bits+= 1.0; //avoid 1/0 issues
320 for(i=0; i<s->avctx->rc_override_count; i++){
321 RcOverride *rco= s->avctx->rc_override;
322 if(rco[i].start_frame > frame_num) continue;
323 if(rco[i].end_frame < frame_num) continue;
326 bits= qp2bits(rce, rco[i].qscale); //FIXME move at end to really force it?
328 bits*= rco[i].quality_factor;
331 q= bits2qp(rce, bits);
334 if (pict_type==I_TYPE && s->avctx->i_quant_factor<0.0)
335 q= -q*s->avctx->i_quant_factor + s->avctx->i_quant_offset;
336 else if(pict_type==B_TYPE && s->avctx->b_quant_factor<0.0)
337 q= -q*s->avctx->b_quant_factor + s->avctx->b_quant_offset;
342 static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q){
343 RateControlContext *rcc= &s->rc_context;
344 AVCodecContext *a= s->avctx;
345 const int pict_type= rce->new_pict_type;
346 const double last_p_q = rcc->last_qscale_for[P_TYPE];
347 const double last_non_b_q= rcc->last_qscale_for[rcc->last_non_b_pict_type];
349 if (pict_type==I_TYPE && (a->i_quant_factor>0.0 || rcc->last_non_b_pict_type==P_TYPE))
350 q= last_p_q *ABS(a->i_quant_factor) + a->i_quant_offset;
351 else if(pict_type==B_TYPE && a->b_quant_factor>0.0)
352 q= last_non_b_q* a->b_quant_factor + a->b_quant_offset;
354 /* last qscale / qdiff stuff */
355 if(rcc->last_non_b_pict_type==pict_type || pict_type!=I_TYPE){
356 double last_q= rcc->last_qscale_for[pict_type];
357 const int maxdiff= FF_QP2LAMBDA * a->max_qdiff;
359 if (q > last_q + maxdiff) q= last_q + maxdiff;
360 else if(q < last_q - maxdiff) q= last_q - maxdiff;
363 rcc->last_qscale_for[pict_type]= q; //Note we cant do that after blurring
365 if(pict_type!=B_TYPE)
366 rcc->last_non_b_pict_type= pict_type;
372 * gets the qmin & qmax for pict_type
374 static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pict_type){
375 int qmin= s->avctx->lmin;
376 int qmax= s->avctx->lmax;
378 assert(qmin <= qmax);
380 if(pict_type==B_TYPE){
381 qmin= (int)(qmin*ABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
382 qmax= (int)(qmax*ABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
383 }else if(pict_type==I_TYPE){
384 qmin= (int)(qmin*ABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
385 qmax= (int)(qmax*ABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
388 qmin= clip(qmin, 1, FF_LAMBDA_MAX);
389 qmax= clip(qmax, 1, FF_LAMBDA_MAX);
391 if(qmax<qmin) qmax= qmin;
397 static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q, int frame_num){
398 RateControlContext *rcc= &s->rc_context;
401 const int pict_type= rce->new_pict_type;
402 const double buffer_size= s->avctx->rc_buffer_size;
403 const double fps= 1/av_q2d(s->avctx->time_base);
404 const double min_rate= s->avctx->rc_min_rate / fps;
405 const double max_rate= s->avctx->rc_max_rate / fps;
407 get_qminmax(&qmin, &qmax, s, pict_type);
410 if(s->avctx->rc_qmod_freq && frame_num%s->avctx->rc_qmod_freq==0 && pict_type==P_TYPE)
411 q*= s->avctx->rc_qmod_amp;
413 bits= qp2bits(rce, q);
414 //printf("q:%f\n", q);
415 /* buffer overflow/underflow protection */
417 double expected_size= rcc->buffer_index;
421 double d= 2*(buffer_size - expected_size)/buffer_size;
423 else if(d<0.0001) d=0.0001;
424 q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
426 q_limit= bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index)*3, 1));
428 if(s->avctx->debug&FF_DEBUG_RC){
429 av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
436 double d= 2*expected_size/buffer_size;
438 else if(d<0.0001) d=0.0001;
439 q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
441 q_limit= bits2qp(rce, FFMAX(rcc->buffer_index/3, 1));
443 if(s->avctx->debug&FF_DEBUG_RC){
444 av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
450 //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);
451 if(s->avctx->rc_qsquish==0.0 || qmin==qmax){
453 else if(q>qmax) q=qmax;
455 double min2= log(qmin);
456 double max2= log(qmax);
459 q= (q - min2)/(max2-min2) - 0.5;
461 q= 1.0/(1.0 + exp(q));
462 q= q*(max2-min2) + min2;
470 //----------------------------------
473 static double predict_size(Predictor *p, double q, double var)
475 return p->coeff*var / (q*p->count);
479 static double predict_qp(Predictor *p, double size, double var)
481 //printf("coeff:%f, count:%f, var:%f, size:%f//\n", p->coeff, p->count, var, size);
482 return p->coeff*var / (size*p->count);
486 static void update_predictor(Predictor *p, double q, double var, double size)
488 double new_coeff= size*q / (var + 1);
494 p->coeff+= new_coeff;
497 static void adaptive_quantization(MpegEncContext *s, double q){
499 const float lumi_masking= s->avctx->lumi_masking / (128.0*128.0);
500 const float dark_masking= s->avctx->dark_masking / (128.0*128.0);
501 const float temp_cplx_masking= s->avctx->temporal_cplx_masking;
502 const float spatial_cplx_masking = s->avctx->spatial_cplx_masking;
503 const float p_masking = s->avctx->p_masking;
504 const float border_masking = s->avctx->border_masking;
507 float cplx_tab[s->mb_num];
508 float bits_tab[s->mb_num];
509 const int qmin= s->avctx->mb_lmin;
510 const int qmax= s->avctx->mb_lmax;
511 Picture * const pic= &s->current_picture;
512 const int mb_width = s->mb_width;
513 const int mb_height = s->mb_height;
515 for(i=0; i<s->mb_num; i++){
516 const int mb_xy= s->mb_index2xy[i];
517 float temp_cplx= sqrt(pic->mc_mb_var[mb_xy]); //FIXME merge in pow()
518 float spat_cplx= sqrt(pic->mb_var[mb_xy]);
519 const int lumi= pic->mb_mean[mb_xy];
520 float bits, cplx, factor;
521 int mb_x = mb_xy % s->mb_stride;
522 int mb_y = mb_xy / s->mb_stride;
524 float mb_factor = 0.0;
526 if(spat_cplx < q/3) spat_cplx= q/3; //FIXME finetune
527 if(temp_cplx < q/3) temp_cplx= q/3; //FIXME finetune
529 if(spat_cplx < 4) spat_cplx= 4; //FIXME finetune
530 if(temp_cplx < 4) temp_cplx= 4; //FIXME finetune
532 if((s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_INTRA)){//FIXME hq mode
534 factor= 1.0 + p_masking;
537 factor= pow(temp_cplx, - temp_cplx_masking);
539 factor*=pow(spat_cplx, - spatial_cplx_masking);
542 factor*= (1.0 - (lumi-128)*(lumi-128)*lumi_masking);
544 factor*= (1.0 - (lumi-128)*(lumi-128)*dark_masking);
546 if(mb_x < mb_width/5){
547 mb_distance = mb_width/5 - mb_x;
548 mb_factor = (float)mb_distance / (float)(mb_width/5);
549 }else if(mb_x > 4*mb_width/5){
550 mb_distance = mb_x - 4*mb_width/5;
551 mb_factor = (float)mb_distance / (float)(mb_width/5);
553 if(mb_y < mb_height/5){
554 mb_distance = mb_height/5 - mb_y;
555 mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
556 }else if(mb_y > 4*mb_height/5){
557 mb_distance = mb_y - 4*mb_height/5;
558 mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
561 factor*= 1.0 - border_masking*mb_factor;
563 if(factor<0.00001) factor= 0.00001;
572 /* handle qmin/qmax cliping */
573 if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
574 float factor= bits_sum/cplx_sum;
575 for(i=0; i<s->mb_num; i++){
576 float newq= q*cplx_tab[i]/bits_tab[i];
580 bits_sum -= bits_tab[i];
581 cplx_sum -= cplx_tab[i]*q/qmax;
583 else if(newq < qmin){
584 bits_sum -= bits_tab[i];
585 cplx_sum -= cplx_tab[i]*q/qmin;
588 if(bits_sum < 0.001) bits_sum= 0.001;
589 if(cplx_sum < 0.001) cplx_sum= 0.001;
592 for(i=0; i<s->mb_num; i++){
593 const int mb_xy= s->mb_index2xy[i];
594 float newq= q*cplx_tab[i]/bits_tab[i];
597 if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
598 newq*= bits_sum/cplx_sum;
601 intq= (int)(newq + 0.5);
603 if (intq > qmax) intq= qmax;
604 else if(intq < qmin) intq= qmin;
605 //if(i%s->mb_width==0) printf("\n");
606 //printf("%2d%3d ", intq, ff_sqrt(s->mc_mb_var[i]));
607 s->lambda_table[mb_xy]= intq;
610 //FIXME rd or at least approx for dquant
612 float ff_rate_estimate_qscale(MpegEncContext *s)
616 float br_compensation;
620 int picture_number= s->picture_number;
622 RateControlContext *rcc= &s->rc_context;
623 AVCodecContext *a= s->avctx;
624 RateControlEntry local_rce, *rce;
628 const int pict_type= s->pict_type;
629 Picture * const pic= &s->current_picture;
632 get_qminmax(&qmin, &qmax, s, pict_type);
634 fps= 1/av_q2d(s->avctx->time_base);
635 //printf("input_pic_num:%d pic_num:%d frame_rate:%d\n", s->input_picture_number, s->picture_number, s->frame_rate);
636 /* update predictors */
637 if(picture_number>2){
638 const int last_var= s->last_pict_type == I_TYPE ? rcc->last_mb_var_sum : rcc->last_mc_mb_var_sum;
639 update_predictor(&rcc->pred[s->last_pict_type], rcc->last_qscale, sqrt(last_var), s->frame_bits);
642 if(s->flags&CODEC_FLAG_PASS2){
643 assert(picture_number>=0);
644 assert(picture_number<rcc->num_entries);
645 rce= &rcc->entry[picture_number];
646 wanted_bits= rce->expected_bits;
649 wanted_bits= (uint64_t)(s->bit_rate*(double)picture_number/fps);
652 diff= s->total_bits - wanted_bits;
653 br_compensation= (a->bit_rate_tolerance - diff)/a->bit_rate_tolerance;
654 if(br_compensation<=0.0) br_compensation=0.001;
656 var= pict_type == I_TYPE ? pic->mb_var_sum : pic->mc_mb_var_sum;
658 short_term_q = 0; /* avoid warning */
659 if(s->flags&CODEC_FLAG_PASS2){
660 if(pict_type!=I_TYPE)
661 assert(pict_type == rce->new_pict_type);
663 q= rce->new_qscale / br_compensation;
664 //printf("%f %f %f last:%d var:%d type:%d//\n", q, rce->new_qscale, br_compensation, s->frame_bits, var, pict_type);
667 rce->new_pict_type= pict_type;
668 rce->mc_mb_var_sum= pic->mc_mb_var_sum;
669 rce->mb_var_sum = pic-> mb_var_sum;
670 rce->qscale = FF_QP2LAMBDA * 2;
671 rce->f_code = s->f_code;
672 rce->b_code = s->b_code;
675 bits= predict_size(&rcc->pred[pict_type], rce->qscale, sqrt(var));
676 if(pict_type== I_TYPE){
677 rce->i_count = s->mb_num;
678 rce->i_tex_bits= bits;
682 rce->i_count = 0; //FIXME we do know this approx
684 rce->p_tex_bits= bits*0.9;
686 rce->mv_bits= bits*0.1;
688 rcc->i_cplx_sum [pict_type] += rce->i_tex_bits*rce->qscale;
689 rcc->p_cplx_sum [pict_type] += rce->p_tex_bits*rce->qscale;
690 rcc->mv_bits_sum[pict_type] += rce->mv_bits;
691 rcc->frame_count[pict_type] ++;
693 bits= rce->i_tex_bits + rce->p_tex_bits;
694 rate_factor= rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum * br_compensation;
696 q= get_qscale(s, rce, rate_factor, picture_number);
700 q= get_diff_limited_q(s, rce, q);
704 if(pict_type==P_TYPE || s->intra_only){ //FIXME type dependant blur like in 2-pass
705 rcc->short_term_qsum*=a->qblur;
706 rcc->short_term_qcount*=a->qblur;
708 rcc->short_term_qsum+= q;
709 rcc->short_term_qcount++;
711 q= short_term_q= rcc->short_term_qsum/rcc->short_term_qcount;
716 q= modify_qscale(s, rce, q, picture_number);
718 rcc->pass1_wanted_bits+= s->bit_rate/fps;
723 if(s->avctx->debug&FF_DEBUG_RC){
724 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",
725 av_get_pict_type_char(pict_type), qmin, q, qmax, picture_number, (int)wanted_bits/1000, (int)s->total_bits/1000,
726 br_compensation, short_term_q, s->frame_bits, pic->mb_var_sum, pic->mc_mb_var_sum, s->bit_rate/1000, (int)fps
731 else if(q>qmax) q=qmax;
733 if(s->adaptive_quant)
734 adaptive_quantization(s, q);
739 rcc->last_mc_mb_var_sum= pic->mc_mb_var_sum;
740 rcc->last_mb_var_sum= pic->mb_var_sum;
743 static int mvsum=0, texsum=0;
745 texsum += s->i_tex_bits + s->p_tex_bits;
746 printf("%d %d//\n\n", mvsum, texsum);
752 //----------------------------------------------
755 static int init_pass2(MpegEncContext *s)
757 RateControlContext *rcc= &s->rc_context;
758 AVCodecContext *a= s->avctx;
760 double fps= 1/av_q2d(s->avctx->time_base);
761 double complexity[5]={0,0,0,0,0}; // aproximate bits at quant=1
762 double avg_quantizer[5];
763 uint64_t const_bits[5]={0,0,0,0,0}; // quantizer idependant bits
764 uint64_t available_bits[5];
765 uint64_t all_const_bits;
766 uint64_t all_available_bits= (uint64_t)(s->bit_rate*(double)rcc->num_entries/fps);
767 double rate_factor=0;
769 //int last_i_frame=-10000000;
770 const int filter_size= (int)(a->qblur*4) | 1;
771 double expected_bits;
772 double *qscale, *blured_qscale;
774 /* find complexity & const_bits & decide the pict_types */
775 for(i=0; i<rcc->num_entries; i++){
776 RateControlEntry *rce= &rcc->entry[i];
778 rce->new_pict_type= rce->pict_type;
779 rcc->i_cplx_sum [rce->pict_type] += rce->i_tex_bits*rce->qscale;
780 rcc->p_cplx_sum [rce->pict_type] += rce->p_tex_bits*rce->qscale;
781 rcc->mv_bits_sum[rce->pict_type] += rce->mv_bits;
782 rcc->frame_count[rce->pict_type] ++;
784 complexity[rce->new_pict_type]+= (rce->i_tex_bits+ rce->p_tex_bits)*(double)rce->qscale;
785 const_bits[rce->new_pict_type]+= rce->mv_bits + rce->misc_bits;
787 all_const_bits= const_bits[I_TYPE] + const_bits[P_TYPE] + const_bits[B_TYPE];
789 if(all_available_bits < all_const_bits){
790 av_log(s->avctx, AV_LOG_ERROR, "requested bitrate is to low\n");
794 /* find average quantizers */
795 avg_quantizer[P_TYPE]=0;
796 for(step=256*256; step>0.0000001; step*=0.5){
797 double expected_bits=0;
798 avg_quantizer[P_TYPE]+= step;
800 avg_quantizer[I_TYPE]= avg_quantizer[P_TYPE]*ABS(s->avctx->i_quant_factor) + s->avctx->i_quant_offset;
801 avg_quantizer[B_TYPE]= avg_quantizer[P_TYPE]*ABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset;
805 + complexity[I_TYPE]/avg_quantizer[I_TYPE]
806 + complexity[P_TYPE]/avg_quantizer[P_TYPE]
807 + complexity[B_TYPE]/avg_quantizer[B_TYPE];
809 if(expected_bits < all_available_bits) avg_quantizer[P_TYPE]-= step;
810 //printf("%f %lld %f\n", expected_bits, all_available_bits, avg_quantizer[P_TYPE]);
812 //printf("qp_i:%f, qp_p:%f, qp_b:%f\n", avg_quantizer[I_TYPE],avg_quantizer[P_TYPE],avg_quantizer[B_TYPE]);
815 available_bits[i]= const_bits[i] + complexity[i]/avg_quantizer[i];
817 //printf("%lld %lld %lld %lld\n", available_bits[I_TYPE], available_bits[P_TYPE], available_bits[B_TYPE], all_available_bits);
819 qscale= av_malloc(sizeof(double)*rcc->num_entries);
820 blured_qscale= av_malloc(sizeof(double)*rcc->num_entries);
822 for(step=256*256; step>0.0000001; step*=0.5){
826 rcc->buffer_index= s->avctx->rc_buffer_size/2;
829 for(i=0; i<rcc->num_entries; i++){
830 qscale[i]= get_qscale(s, &rcc->entry[i], rate_factor, i);
832 assert(filter_size%2==1);
834 /* fixed I/B QP relative to P mode */
835 for(i=rcc->num_entries-1; i>=0; i--){
836 RateControlEntry *rce= &rcc->entry[i];
838 qscale[i]= get_diff_limited_q(s, rce, qscale[i]);
842 for(i=0; i<rcc->num_entries; i++){
843 RateControlEntry *rce= &rcc->entry[i];
844 const int pict_type= rce->new_pict_type;
846 double q=0.0, sum=0.0;
848 for(j=0; j<filter_size; j++){
849 int index= i+j-filter_size/2;
851 double coeff= a->qblur==0 ? 1.0 : exp(-d*d/(a->qblur * a->qblur));
853 if(index < 0 || index >= rcc->num_entries) continue;
854 if(pict_type != rcc->entry[index].new_pict_type) continue;
855 q+= qscale[index] * coeff;
858 blured_qscale[i]= q/sum;
861 /* find expected bits */
862 for(i=0; i<rcc->num_entries; i++){
863 RateControlEntry *rce= &rcc->entry[i];
865 rce->new_qscale= modify_qscale(s, rce, blured_qscale[i], i);
866 bits= qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits;
867 //printf("%d %f\n", rce->new_bits, blured_qscale[i]);
868 bits += 8*ff_vbv_update(s, bits);
870 rce->expected_bits= expected_bits;
871 expected_bits += bits;
874 // printf("%f %d %f\n", expected_bits, (int)all_available_bits, rate_factor);
875 if(expected_bits > all_available_bits) rate_factor-= step;
878 av_free(blured_qscale);
880 if(abs(expected_bits/all_available_bits - 1.0) > 0.01 ){
881 av_log(s->avctx, AV_LOG_ERROR, "Error: 2pass curve failed to converge\n");