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 "ratecontrol.h"
29 #include "mpegvideo.h"
32 #undef NDEBUG // allways check asserts, the speed effect is far too small to disable them
36 #define M_E 2.718281828
39 static int init_pass2(MpegEncContext *s);
40 static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num);
42 void ff_write_pass1_stats(MpegEncContext *s){
43 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",
44 s->current_picture_ptr->display_picture_number, s->current_picture_ptr->coded_picture_number, s->pict_type,
45 s->current_picture.quality, s->i_tex_bits, s->p_tex_bits, s->mv_bits, s->misc_bits,
46 s->f_code, s->b_code, s->current_picture.mc_mb_var_sum, s->current_picture.mb_var_sum, s->i_count, s->skip_count, s->header_bits);
49 int ff_rate_control_init(MpegEncContext *s)
51 RateControlContext *rcc= &s->rc_context;
56 rcc->pred[i].coeff= FF_QP2LAMBDA * 7.0;
57 rcc->pred[i].count= 1.0;
59 rcc->pred[i].decay= 0.4;
64 rcc->frame_count[i]= 1; // 1 is better cuz of 1/0 and such
65 rcc->last_qscale_for[i]=FF_QP2LAMBDA * 5;
67 rcc->buffer_index= s->avctx->rc_initial_buffer_occupancy;
69 if(s->flags&CODEC_FLAG_PASS2){
73 /* find number of pics */
74 p= s->avctx->stats_in;
79 if(i<=0 || i>=INT_MAX / sizeof(RateControlEntry))
81 rcc->entry = (RateControlEntry*)av_mallocz(i*sizeof(RateControlEntry));
84 /* init all to skipped p frames (with b frames we might have a not encoded frame at the end FIXME) */
85 for(i=0; i<rcc->num_entries; i++){
86 RateControlEntry *rce= &rcc->entry[i];
87 rce->pict_type= rce->new_pict_type=P_TYPE;
88 rce->qscale= rce->new_qscale=FF_QP2LAMBDA * 2;
89 rce->misc_bits= s->mb_num + 10;
90 rce->mb_var_sum= s->mb_num*100;
94 p= s->avctx->stats_in;
95 for(i=0; i<rcc->num_entries - s->max_b_frames; i++){
96 RateControlEntry *rce;
101 next= strchr(p, ';');
103 (*next)=0; //sscanf in unbelieavle slow on looong strings //FIXME copy / dont write
106 e= sscanf(p, " in:%d ", &picture_number);
108 assert(picture_number >= 0);
109 assert(picture_number < rcc->num_entries);
110 rce= &rcc->entry[picture_number];
112 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",
113 &rce->pict_type, &rce->qscale, &rce->i_tex_bits, &rce->p_tex_bits, &rce->mv_bits, &rce->misc_bits,
114 &rce->f_code, &rce->b_code, &rce->mc_mb_var_sum, &rce->mb_var_sum, &rce->i_count, &rce->skip_count, &rce->header_bits);
116 av_log(s->avctx, AV_LOG_ERROR, "statistics are damaged at line %d, parser out=%d\n", i, e);
123 if(init_pass2(s) < 0) return -1;
125 //FIXME maybe move to end
126 if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID) {
128 return ff_xvid_rate_control_init(s);
130 av_log(s->avctx, AV_LOG_ERROR, "XviD ratecontrol requires libavcodec compiled with XviD support\n");
136 if(!(s->flags&CODEC_FLAG_PASS2)){
138 rcc->short_term_qsum=0.001;
139 rcc->short_term_qcount=0.001;
141 rcc->pass1_rc_eq_output_sum= 0.001;
142 rcc->pass1_wanted_bits=0.001;
144 /* init stuff with the user specified complexity */
145 if(s->avctx->rc_initial_cplx){
146 for(i=0; i<60*30; i++){
147 double bits= s->avctx->rc_initial_cplx * (i/10000.0 + 1.0)*s->mb_num;
148 RateControlEntry rce;
151 if (i%((s->gop_size+3)/4)==0) rce.pict_type= I_TYPE;
152 else if(i%(s->max_b_frames+1)) rce.pict_type= B_TYPE;
153 else rce.pict_type= P_TYPE;
155 rce.new_pict_type= rce.pict_type;
156 rce.mc_mb_var_sum= bits*s->mb_num/100000;
157 rce.mb_var_sum = s->mb_num;
158 rce.qscale = FF_QP2LAMBDA * 2;
163 if(s->pict_type== I_TYPE){
164 rce.i_count = s->mb_num;
165 rce.i_tex_bits= bits;
169 rce.i_count = 0; //FIXME we do know this approx
171 rce.p_tex_bits= bits*0.9;
172 rce.mv_bits= bits*0.1;
174 rcc->i_cplx_sum [rce.pict_type] += rce.i_tex_bits*rce.qscale;
175 rcc->p_cplx_sum [rce.pict_type] += rce.p_tex_bits*rce.qscale;
176 rcc->mv_bits_sum[rce.pict_type] += rce.mv_bits;
177 rcc->frame_count[rce.pict_type] ++;
179 bits= rce.i_tex_bits + rce.p_tex_bits;
181 q= get_qscale(s, &rce, rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum, i);
182 rcc->pass1_wanted_bits+= s->bit_rate/(1/av_q2d(s->avctx->time_base)); //FIXME missbehaves a little for variable fps
191 void ff_rate_control_uninit(MpegEncContext *s)
193 RateControlContext *rcc= &s->rc_context;
196 av_freep(&rcc->entry);
199 if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
200 ff_xvid_rate_control_uninit(s);
204 static inline double qp2bits(RateControlEntry *rce, double qp){
206 av_log(NULL, AV_LOG_ERROR, "qp<=0.0\n");
208 return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ qp;
211 static inline double bits2qp(RateControlEntry *rce, double bits){
213 av_log(NULL, AV_LOG_ERROR, "bits<0.9\n");
215 return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ bits;
218 int ff_vbv_update(MpegEncContext *s, int frame_size){
219 RateControlContext *rcc= &s->rc_context;
220 const double fps= 1/av_q2d(s->avctx->time_base);
221 const int buffer_size= s->avctx->rc_buffer_size;
222 const double min_rate= s->avctx->rc_min_rate/fps;
223 const double max_rate= s->avctx->rc_max_rate/fps;
225 //printf("%d %f %d %f %f\n", buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate);
229 rcc->buffer_index-= frame_size;
230 if(rcc->buffer_index < 0){
231 av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n");
232 rcc->buffer_index= 0;
235 left= buffer_size - rcc->buffer_index - 1;
236 rcc->buffer_index += clip(left, min_rate, max_rate);
238 if(rcc->buffer_index > buffer_size){
239 int stuffing= ceil((rcc->buffer_index - buffer_size)/8);
241 if(stuffing < 4 && s->codec_id == CODEC_ID_MPEG4)
243 rcc->buffer_index -= 8*stuffing;
245 if(s->avctx->debug & FF_DEBUG_RC)
246 av_log(s->avctx, AV_LOG_DEBUG, "stuffing %d bytes\n", stuffing);
255 * modifies the bitrate curve from pass1 for one frame
257 static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num){
258 RateControlContext *rcc= &s->rc_context;
259 AVCodecContext *a= s->avctx;
261 const int pict_type= rce->new_pict_type;
262 const double mb_num= s->mb_num;
266 double const_values[]={
269 rce->i_tex_bits*rce->qscale,
270 rce->p_tex_bits*rce->qscale,
271 (rce->i_tex_bits + rce->p_tex_bits)*(double)rce->qscale,
273 rce->pict_type == B_TYPE ? (rce->f_code + rce->b_code)*0.5 : rce->f_code,
275 rce->mc_mb_var_sum/mb_num,
276 rce->mb_var_sum/mb_num,
277 rce->pict_type == I_TYPE,
278 rce->pict_type == P_TYPE,
279 rce->pict_type == B_TYPE,
280 rcc->qscale_sum[pict_type] / (double)rcc->frame_count[pict_type],
282 /* rcc->last_qscale_for[I_TYPE],
283 rcc->last_qscale_for[P_TYPE],
284 rcc->last_qscale_for[B_TYPE],
285 rcc->next_non_b_qscale,*/
286 rcc->i_cplx_sum[I_TYPE] / (double)rcc->frame_count[I_TYPE],
287 rcc->i_cplx_sum[P_TYPE] / (double)rcc->frame_count[P_TYPE],
288 rcc->p_cplx_sum[P_TYPE] / (double)rcc->frame_count[P_TYPE],
289 rcc->p_cplx_sum[B_TYPE] / (double)rcc->frame_count[B_TYPE],
290 (rcc->i_cplx_sum[pict_type] + rcc->p_cplx_sum[pict_type]) / (double)rcc->frame_count[pict_type],
293 static const char *const_names[]={
320 static double (*func1[])(void *, double)={
325 static const char *func1_names[]={
331 bits= ff_eval2(s->avctx->rc_eq, const_values, const_names, func1, func1_names, NULL, NULL, rce, &error);
333 av_log(s->avctx, AV_LOG_ERROR, "Error evaluating rc_eq \"%s\": %s\n", s->avctx->rc_eq, error? error : "");
337 rcc->pass1_rc_eq_output_sum+= bits;
339 if(bits<0.0) bits=0.0;
340 bits+= 1.0; //avoid 1/0 issues
343 for(i=0; i<s->avctx->rc_override_count; i++){
344 RcOverride *rco= s->avctx->rc_override;
345 if(rco[i].start_frame > frame_num) continue;
346 if(rco[i].end_frame < frame_num) continue;
349 bits= qp2bits(rce, rco[i].qscale); //FIXME move at end to really force it?
351 bits*= rco[i].quality_factor;
354 q= bits2qp(rce, bits);
357 if (pict_type==I_TYPE && s->avctx->i_quant_factor<0.0)
358 q= -q*s->avctx->i_quant_factor + s->avctx->i_quant_offset;
359 else if(pict_type==B_TYPE && s->avctx->b_quant_factor<0.0)
360 q= -q*s->avctx->b_quant_factor + s->avctx->b_quant_offset;
365 static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q){
366 RateControlContext *rcc= &s->rc_context;
367 AVCodecContext *a= s->avctx;
368 const int pict_type= rce->new_pict_type;
369 const double last_p_q = rcc->last_qscale_for[P_TYPE];
370 const double last_non_b_q= rcc->last_qscale_for[rcc->last_non_b_pict_type];
372 if (pict_type==I_TYPE && (a->i_quant_factor>0.0 || rcc->last_non_b_pict_type==P_TYPE))
373 q= last_p_q *ABS(a->i_quant_factor) + a->i_quant_offset;
374 else if(pict_type==B_TYPE && a->b_quant_factor>0.0)
375 q= last_non_b_q* a->b_quant_factor + a->b_quant_offset;
377 /* last qscale / qdiff stuff */
378 if(rcc->last_non_b_pict_type==pict_type || pict_type!=I_TYPE){
379 double last_q= rcc->last_qscale_for[pict_type];
380 const int maxdiff= FF_QP2LAMBDA * a->max_qdiff;
382 if (q > last_q + maxdiff) q= last_q + maxdiff;
383 else if(q < last_q - maxdiff) q= last_q - maxdiff;
386 rcc->last_qscale_for[pict_type]= q; //Note we cant do that after blurring
388 if(pict_type!=B_TYPE)
389 rcc->last_non_b_pict_type= pict_type;
395 * gets the qmin & qmax for pict_type
397 static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pict_type){
398 int qmin= s->avctx->lmin;
399 int qmax= s->avctx->lmax;
401 assert(qmin <= qmax);
403 if(pict_type==B_TYPE){
404 qmin= (int)(qmin*ABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
405 qmax= (int)(qmax*ABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
406 }else if(pict_type==I_TYPE){
407 qmin= (int)(qmin*ABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
408 qmax= (int)(qmax*ABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
411 qmin= clip(qmin, 1, FF_LAMBDA_MAX);
412 qmax= clip(qmax, 1, FF_LAMBDA_MAX);
414 if(qmax<qmin) qmax= qmin;
420 static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q, int frame_num){
421 RateControlContext *rcc= &s->rc_context;
424 const int pict_type= rce->new_pict_type;
425 const double buffer_size= s->avctx->rc_buffer_size;
426 const double fps= 1/av_q2d(s->avctx->time_base);
427 const double min_rate= s->avctx->rc_min_rate / fps;
428 const double max_rate= s->avctx->rc_max_rate / fps;
430 get_qminmax(&qmin, &qmax, s, pict_type);
433 if(s->avctx->rc_qmod_freq && frame_num%s->avctx->rc_qmod_freq==0 && pict_type==P_TYPE)
434 q*= s->avctx->rc_qmod_amp;
436 bits= qp2bits(rce, q);
437 //printf("q:%f\n", q);
438 /* buffer overflow/underflow protection */
440 double expected_size= rcc->buffer_index;
444 double d= 2*(buffer_size - expected_size)/buffer_size;
446 else if(d<0.0001) d=0.0001;
447 q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
449 q_limit= bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index)*3, 1));
451 if(s->avctx->debug&FF_DEBUG_RC){
452 av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
459 double d= 2*expected_size/buffer_size;
461 else if(d<0.0001) d=0.0001;
462 q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
464 q_limit= bits2qp(rce, FFMAX(rcc->buffer_index/3, 1));
466 if(s->avctx->debug&FF_DEBUG_RC){
467 av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
473 //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);
474 if(s->avctx->rc_qsquish==0.0 || qmin==qmax){
476 else if(q>qmax) q=qmax;
478 double min2= log(qmin);
479 double max2= log(qmax);
482 q= (q - min2)/(max2-min2) - 0.5;
484 q= 1.0/(1.0 + exp(q));
485 q= q*(max2-min2) + min2;
493 //----------------------------------
496 static double predict_size(Predictor *p, double q, double var)
498 return p->coeff*var / (q*p->count);
502 static double predict_qp(Predictor *p, double size, double var)
504 //printf("coeff:%f, count:%f, var:%f, size:%f//\n", p->coeff, p->count, var, size);
505 return p->coeff*var / (size*p->count);
509 static void update_predictor(Predictor *p, double q, double var, double size)
511 double new_coeff= size*q / (var + 1);
517 p->coeff+= new_coeff;
520 static void adaptive_quantization(MpegEncContext *s, double q){
522 const float lumi_masking= s->avctx->lumi_masking / (128.0*128.0);
523 const float dark_masking= s->avctx->dark_masking / (128.0*128.0);
524 const float temp_cplx_masking= s->avctx->temporal_cplx_masking;
525 const float spatial_cplx_masking = s->avctx->spatial_cplx_masking;
526 const float p_masking = s->avctx->p_masking;
527 const float border_masking = s->avctx->border_masking;
530 float cplx_tab[s->mb_num];
531 float bits_tab[s->mb_num];
532 const int qmin= s->avctx->mb_lmin;
533 const int qmax= s->avctx->mb_lmax;
534 Picture * const pic= &s->current_picture;
535 const int mb_width = s->mb_width;
536 const int mb_height = s->mb_height;
538 for(i=0; i<s->mb_num; i++){
539 const int mb_xy= s->mb_index2xy[i];
540 float temp_cplx= sqrt(pic->mc_mb_var[mb_xy]); //FIXME merge in pow()
541 float spat_cplx= sqrt(pic->mb_var[mb_xy]);
542 const int lumi= pic->mb_mean[mb_xy];
543 float bits, cplx, factor;
544 int mb_x = mb_xy % s->mb_stride;
545 int mb_y = mb_xy / s->mb_stride;
547 float mb_factor = 0.0;
549 if(spat_cplx < q/3) spat_cplx= q/3; //FIXME finetune
550 if(temp_cplx < q/3) temp_cplx= q/3; //FIXME finetune
552 if(spat_cplx < 4) spat_cplx= 4; //FIXME finetune
553 if(temp_cplx < 4) temp_cplx= 4; //FIXME finetune
555 if((s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_INTRA)){//FIXME hq mode
557 factor= 1.0 + p_masking;
560 factor= pow(temp_cplx, - temp_cplx_masking);
562 factor*=pow(spat_cplx, - spatial_cplx_masking);
565 factor*= (1.0 - (lumi-128)*(lumi-128)*lumi_masking);
567 factor*= (1.0 - (lumi-128)*(lumi-128)*dark_masking);
569 if(mb_x < mb_width/5){
570 mb_distance = mb_width/5 - mb_x;
571 mb_factor = (float)mb_distance / (float)(mb_width/5);
572 }else if(mb_x > 4*mb_width/5){
573 mb_distance = mb_x - 4*mb_width/5;
574 mb_factor = (float)mb_distance / (float)(mb_width/5);
576 if(mb_y < mb_height/5){
577 mb_distance = mb_height/5 - mb_y;
578 mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
579 }else if(mb_y > 4*mb_height/5){
580 mb_distance = mb_y - 4*mb_height/5;
581 mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
584 factor*= 1.0 - border_masking*mb_factor;
586 if(factor<0.00001) factor= 0.00001;
595 /* handle qmin/qmax cliping */
596 if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
597 float factor= bits_sum/cplx_sum;
598 for(i=0; i<s->mb_num; i++){
599 float newq= q*cplx_tab[i]/bits_tab[i];
603 bits_sum -= bits_tab[i];
604 cplx_sum -= cplx_tab[i]*q/qmax;
606 else if(newq < qmin){
607 bits_sum -= bits_tab[i];
608 cplx_sum -= cplx_tab[i]*q/qmin;
611 if(bits_sum < 0.001) bits_sum= 0.001;
612 if(cplx_sum < 0.001) cplx_sum= 0.001;
615 for(i=0; i<s->mb_num; i++){
616 const int mb_xy= s->mb_index2xy[i];
617 float newq= q*cplx_tab[i]/bits_tab[i];
620 if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
621 newq*= bits_sum/cplx_sum;
624 intq= (int)(newq + 0.5);
626 if (intq > qmax) intq= qmax;
627 else if(intq < qmin) intq= qmin;
628 //if(i%s->mb_width==0) printf("\n");
629 //printf("%2d%3d ", intq, ff_sqrt(s->mc_mb_var[i]));
630 s->lambda_table[mb_xy]= intq;
634 void ff_get_2pass_fcode(MpegEncContext *s){
635 RateControlContext *rcc= &s->rc_context;
636 int picture_number= s->picture_number;
637 RateControlEntry *rce;
639 rce= &rcc->entry[picture_number];
640 s->f_code= rce->f_code;
641 s->b_code= rce->b_code;
644 //FIXME rd or at least approx for dquant
646 float ff_rate_estimate_qscale(MpegEncContext *s, int dry_run)
650 float br_compensation;
654 int picture_number= s->picture_number;
656 RateControlContext *rcc= &s->rc_context;
657 AVCodecContext *a= s->avctx;
658 RateControlEntry local_rce, *rce;
662 const int pict_type= s->pict_type;
663 Picture * const pic= &s->current_picture;
667 if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
668 return ff_xvid_rate_estimate_qscale(s, dry_run);
671 get_qminmax(&qmin, &qmax, s, pict_type);
673 fps= 1/av_q2d(s->avctx->time_base);
674 //printf("input_pic_num:%d pic_num:%d frame_rate:%d\n", s->input_picture_number, s->picture_number, s->frame_rate);
675 /* update predictors */
676 if(picture_number>2 && !dry_run){
677 const int last_var= s->last_pict_type == I_TYPE ? rcc->last_mb_var_sum : rcc->last_mc_mb_var_sum;
678 update_predictor(&rcc->pred[s->last_pict_type], rcc->last_qscale, sqrt(last_var), s->frame_bits);
681 if(s->flags&CODEC_FLAG_PASS2){
682 assert(picture_number>=0);
683 assert(picture_number<rcc->num_entries);
684 rce= &rcc->entry[picture_number];
685 wanted_bits= rce->expected_bits;
688 wanted_bits= (uint64_t)(s->bit_rate*(double)picture_number/fps);
691 diff= s->total_bits - wanted_bits;
692 br_compensation= (a->bit_rate_tolerance - diff)/a->bit_rate_tolerance;
693 if(br_compensation<=0.0) br_compensation=0.001;
695 var= pict_type == I_TYPE ? pic->mb_var_sum : pic->mc_mb_var_sum;
697 short_term_q = 0; /* avoid warning */
698 if(s->flags&CODEC_FLAG_PASS2){
699 if(pict_type!=I_TYPE)
700 assert(pict_type == rce->new_pict_type);
702 q= rce->new_qscale / br_compensation;
703 //printf("%f %f %f last:%d var:%d type:%d//\n", q, rce->new_qscale, br_compensation, s->frame_bits, var, pict_type);
706 rce->new_pict_type= pict_type;
707 rce->mc_mb_var_sum= pic->mc_mb_var_sum;
708 rce->mb_var_sum = pic-> mb_var_sum;
709 rce->qscale = FF_QP2LAMBDA * 2;
710 rce->f_code = s->f_code;
711 rce->b_code = s->b_code;
714 bits= predict_size(&rcc->pred[pict_type], rce->qscale, sqrt(var));
715 if(pict_type== I_TYPE){
716 rce->i_count = s->mb_num;
717 rce->i_tex_bits= bits;
721 rce->i_count = 0; //FIXME we do know this approx
723 rce->p_tex_bits= bits*0.9;
725 rce->mv_bits= bits*0.1;
727 rcc->i_cplx_sum [pict_type] += rce->i_tex_bits*rce->qscale;
728 rcc->p_cplx_sum [pict_type] += rce->p_tex_bits*rce->qscale;
729 rcc->mv_bits_sum[pict_type] += rce->mv_bits;
730 rcc->frame_count[pict_type] ++;
732 bits= rce->i_tex_bits + rce->p_tex_bits;
733 rate_factor= rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum * br_compensation;
735 q= get_qscale(s, rce, rate_factor, picture_number);
741 q= get_diff_limited_q(s, rce, q);
745 if(pict_type==P_TYPE || s->intra_only){ //FIXME type dependant blur like in 2-pass
746 rcc->short_term_qsum*=a->qblur;
747 rcc->short_term_qcount*=a->qblur;
749 rcc->short_term_qsum+= q;
750 rcc->short_term_qcount++;
752 q= short_term_q= rcc->short_term_qsum/rcc->short_term_qcount;
757 q= modify_qscale(s, rce, q, picture_number);
759 rcc->pass1_wanted_bits+= s->bit_rate/fps;
764 if(s->avctx->debug&FF_DEBUG_RC){
765 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",
766 av_get_pict_type_char(pict_type), qmin, q, qmax, picture_number, (int)wanted_bits/1000, (int)s->total_bits/1000,
767 br_compensation, short_term_q, s->frame_bits, pic->mb_var_sum, pic->mc_mb_var_sum, s->bit_rate/1000, (int)fps
772 else if(q>qmax) q=qmax;
774 if(s->adaptive_quant)
775 adaptive_quantization(s, q);
781 rcc->last_mc_mb_var_sum= pic->mc_mb_var_sum;
782 rcc->last_mb_var_sum= pic->mb_var_sum;
786 static int mvsum=0, texsum=0;
788 texsum += s->i_tex_bits + s->p_tex_bits;
789 printf("%d %d//\n\n", mvsum, texsum);
795 //----------------------------------------------
798 static int init_pass2(MpegEncContext *s)
800 RateControlContext *rcc= &s->rc_context;
801 AVCodecContext *a= s->avctx;
803 double fps= 1/av_q2d(s->avctx->time_base);
804 double complexity[5]={0,0,0,0,0}; // aproximate bits at quant=1
805 uint64_t const_bits[5]={0,0,0,0,0}; // quantizer idependant bits
806 uint64_t all_const_bits;
807 uint64_t all_available_bits= (uint64_t)(s->bit_rate*(double)rcc->num_entries/fps);
808 double rate_factor=0;
810 //int last_i_frame=-10000000;
811 const int filter_size= (int)(a->qblur*4) | 1;
812 double expected_bits;
813 double *qscale, *blured_qscale, qscale_sum;
815 /* find complexity & const_bits & decide the pict_types */
816 for(i=0; i<rcc->num_entries; i++){
817 RateControlEntry *rce= &rcc->entry[i];
819 rce->new_pict_type= rce->pict_type;
820 rcc->i_cplx_sum [rce->pict_type] += rce->i_tex_bits*rce->qscale;
821 rcc->p_cplx_sum [rce->pict_type] += rce->p_tex_bits*rce->qscale;
822 rcc->mv_bits_sum[rce->pict_type] += rce->mv_bits;
823 rcc->frame_count[rce->pict_type] ++;
825 complexity[rce->new_pict_type]+= (rce->i_tex_bits+ rce->p_tex_bits)*(double)rce->qscale;
826 const_bits[rce->new_pict_type]+= rce->mv_bits + rce->misc_bits;
828 all_const_bits= const_bits[I_TYPE] + const_bits[P_TYPE] + const_bits[B_TYPE];
830 if(all_available_bits < all_const_bits){
831 av_log(s->avctx, AV_LOG_ERROR, "requested bitrate is too low\n");
835 qscale= av_malloc(sizeof(double)*rcc->num_entries);
836 blured_qscale= av_malloc(sizeof(double)*rcc->num_entries);
839 for(step=256*256; step>0.0000001; step*=0.5){
843 rcc->buffer_index= s->avctx->rc_buffer_size/2;
846 for(i=0; i<rcc->num_entries; i++){
847 qscale[i]= get_qscale(s, &rcc->entry[i], rate_factor, i);
849 assert(filter_size%2==1);
851 /* fixed I/B QP relative to P mode */
852 for(i=rcc->num_entries-1; i>=0; i--){
853 RateControlEntry *rce= &rcc->entry[i];
855 qscale[i]= get_diff_limited_q(s, rce, qscale[i]);
859 for(i=0; i<rcc->num_entries; i++){
860 RateControlEntry *rce= &rcc->entry[i];
861 const int pict_type= rce->new_pict_type;
863 double q=0.0, sum=0.0;
865 for(j=0; j<filter_size; j++){
866 int index= i+j-filter_size/2;
868 double coeff= a->qblur==0 ? 1.0 : exp(-d*d/(a->qblur * a->qblur));
870 if(index < 0 || index >= rcc->num_entries) continue;
871 if(pict_type != rcc->entry[index].new_pict_type) continue;
872 q+= qscale[index] * coeff;
875 blured_qscale[i]= q/sum;
878 /* find expected bits */
879 for(i=0; i<rcc->num_entries; i++){
880 RateControlEntry *rce= &rcc->entry[i];
882 rce->new_qscale= modify_qscale(s, rce, blured_qscale[i], i);
883 bits= qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits;
884 //printf("%d %f\n", rce->new_bits, blured_qscale[i]);
885 bits += 8*ff_vbv_update(s, bits);
887 rce->expected_bits= expected_bits;
888 expected_bits += bits;
892 av_log(s->avctx, AV_LOG_INFO,
893 "expected_bits: %f all_available_bits: %d rate_factor: %f\n",
894 expected_bits, (int)all_available_bits, rate_factor);
896 if(expected_bits > all_available_bits) {
902 av_free(blured_qscale);
904 /* check bitrate calculations and print info */
906 for(i=0; i<rcc->num_entries; i++){
907 /* av_log(s->avctx, AV_LOG_DEBUG, "[lavc rc] entry[%d].new_qscale = %.3f qp = %.3f\n",
908 i, rcc->entry[i].new_qscale, rcc->entry[i].new_qscale / FF_QP2LAMBDA); */
909 qscale_sum += clip(rcc->entry[i].new_qscale / FF_QP2LAMBDA, s->avctx->qmin, s->avctx->qmax);
911 assert(toobig <= 40);
912 av_log(s->avctx, AV_LOG_DEBUG,
913 "[lavc rc] requested bitrate: %d bps expected bitrate: %d bps\n",
915 (int)(expected_bits / ((double)all_available_bits/s->bit_rate)));
916 av_log(s->avctx, AV_LOG_DEBUG,
917 "[lavc rc] estimated target average qp: %.3f\n",
918 (float)qscale_sum / rcc->num_entries);
920 av_log(s->avctx, AV_LOG_INFO,
921 "[lavc rc] Using all of requested bitrate is not "
922 "necessary for this video with these parameters.\n");
923 } else if (toobig == 40) {
924 av_log(s->avctx, AV_LOG_ERROR,
925 "[lavc rc] Error: bitrate too low for this video "
926 "with these parameters.\n");
928 } else if (fabs(expected_bits/all_available_bits - 1.0) > 0.01) {
929 av_log(s->avctx, AV_LOG_ERROR,
930 "[lavc rc] Error: 2pass curve failed to converge\n");