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.
28 #include "libavutil/intmath.h"
31 #include "ratecontrol.h"
32 #include "mpegvideo.h"
33 #include "libavutil/eval.h"
35 #undef NDEBUG // Always check asserts, the speed effect is far too small to disable them.
39 #define M_E 2.718281828
42 static int init_pass2(MpegEncContext *s);
43 static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num);
45 void ff_write_pass1_stats(MpegEncContext *s){
46 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",
47 s->current_picture_ptr->f.display_picture_number, s->current_picture_ptr->f.coded_picture_number, s->pict_type,
48 s->current_picture.f.quality, s->i_tex_bits, s->p_tex_bits, s->mv_bits, s->misc_bits,
49 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);
52 static double get_fps(AVCodecContext *avctx){
53 return 1.0 / av_q2d(avctx->time_base) / FFMAX(avctx->ticks_per_frame, 1);
56 static inline double qp2bits(RateControlEntry *rce, double qp){
58 av_log(NULL, AV_LOG_ERROR, "qp<=0.0\n");
60 return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ qp;
63 static inline double bits2qp(RateControlEntry *rce, double bits){
65 av_log(NULL, AV_LOG_ERROR, "bits<0.9\n");
67 return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ bits;
70 int ff_rate_control_init(MpegEncContext *s)
72 RateControlContext *rcc= &s->rc_context;
74 static const char * const const_names[]={
101 static double (* const func1[])(void *, double)={
106 static const char * const func1_names[]={
113 if (!s->avctx->rc_max_available_vbv_use && s->avctx->rc_buffer_size) {
114 if (s->avctx->rc_max_rate) {
115 s->avctx->rc_max_available_vbv_use = av_clipf(s->avctx->rc_max_rate/(s->avctx->rc_buffer_size*get_fps(s->avctx)), 1.0/0.3, 1.0);
117 s->avctx->rc_max_available_vbv_use = 1.0;
120 res = av_expr_parse(&rcc->rc_eq_eval, s->avctx->rc_eq ? s->avctx->rc_eq : "tex^qComp", const_names, func1_names, func1, NULL, NULL, 0, s->avctx);
122 av_log(s->avctx, AV_LOG_ERROR, "Error parsing rc_eq \"%s\"\n", s->avctx->rc_eq);
127 rcc->pred[i].coeff= FF_QP2LAMBDA * 7.0;
128 rcc->pred[i].count= 1.0;
130 rcc->pred[i].decay= 0.4;
135 rcc->frame_count[i]= 1; // 1 is better because of 1/0 and such
136 rcc->last_qscale_for[i]=FF_QP2LAMBDA * 5;
138 rcc->buffer_index= s->avctx->rc_initial_buffer_occupancy;
139 if (!rcc->buffer_index)
140 rcc->buffer_index = s->avctx->rc_buffer_size * 3 / 4;
142 if(s->flags&CODEC_FLAG_PASS2){
146 /* find number of pics */
147 p= s->avctx->stats_in;
152 if(i<=0 || i>=INT_MAX / sizeof(RateControlEntry))
154 rcc->entry = av_mallocz(i*sizeof(RateControlEntry));
157 /* init all to skipped p frames (with b frames we might have a not encoded frame at the end FIXME) */
158 for(i=0; i<rcc->num_entries; i++){
159 RateControlEntry *rce= &rcc->entry[i];
160 rce->pict_type= rce->new_pict_type=AV_PICTURE_TYPE_P;
161 rce->qscale= rce->new_qscale=FF_QP2LAMBDA * 2;
162 rce->misc_bits= s->mb_num + 10;
163 rce->mb_var_sum= s->mb_num*100;
167 p= s->avctx->stats_in;
168 for(i=0; i<rcc->num_entries - s->max_b_frames; i++){
169 RateControlEntry *rce;
174 next= strchr(p, ';');
176 (*next)=0; //sscanf in unbelievably slow on looong strings //FIXME copy / do not write
179 e= sscanf(p, " in:%d ", &picture_number);
181 assert(picture_number >= 0);
182 assert(picture_number < rcc->num_entries);
183 rce= &rcc->entry[picture_number];
185 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",
186 &rce->pict_type, &rce->qscale, &rce->i_tex_bits, &rce->p_tex_bits, &rce->mv_bits, &rce->misc_bits,
187 &rce->f_code, &rce->b_code, &rce->mc_mb_var_sum, &rce->mb_var_sum, &rce->i_count, &rce->skip_count, &rce->header_bits);
189 av_log(s->avctx, AV_LOG_ERROR, "statistics are damaged at line %d, parser out=%d\n", i, e);
196 if(init_pass2(s) < 0) return -1;
198 //FIXME maybe move to end
199 if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID) {
201 return ff_xvid_rate_control_init(s);
203 av_log(s->avctx, AV_LOG_ERROR, "Xvid ratecontrol requires libavcodec compiled with Xvid support.\n");
209 if(!(s->flags&CODEC_FLAG_PASS2)){
211 rcc->short_term_qsum=0.001;
212 rcc->short_term_qcount=0.001;
214 rcc->pass1_rc_eq_output_sum= 0.001;
215 rcc->pass1_wanted_bits=0.001;
217 if(s->avctx->qblur > 1.0){
218 av_log(s->avctx, AV_LOG_ERROR, "qblur too large\n");
221 /* init stuff with the user specified complexity */
222 if(s->avctx->rc_initial_cplx){
223 for(i=0; i<60*30; i++){
224 double bits= s->avctx->rc_initial_cplx * (i/10000.0 + 1.0)*s->mb_num;
225 RateControlEntry rce;
227 if (i%((s->gop_size+3)/4)==0) rce.pict_type= AV_PICTURE_TYPE_I;
228 else if(i%(s->max_b_frames+1)) rce.pict_type= AV_PICTURE_TYPE_B;
229 else rce.pict_type= AV_PICTURE_TYPE_P;
231 rce.new_pict_type= rce.pict_type;
232 rce.mc_mb_var_sum= bits*s->mb_num/100000;
233 rce.mb_var_sum = s->mb_num;
234 rce.qscale = FF_QP2LAMBDA * 2;
239 if(s->pict_type== AV_PICTURE_TYPE_I){
240 rce.i_count = s->mb_num;
241 rce.i_tex_bits= bits;
245 rce.i_count = 0; //FIXME we do know this approx
247 rce.p_tex_bits= bits*0.9;
248 rce.mv_bits= bits*0.1;
250 rcc->i_cplx_sum [rce.pict_type] += rce.i_tex_bits*rce.qscale;
251 rcc->p_cplx_sum [rce.pict_type] += rce.p_tex_bits*rce.qscale;
252 rcc->mv_bits_sum[rce.pict_type] += rce.mv_bits;
253 rcc->frame_count[rce.pict_type] ++;
255 get_qscale(s, &rce, rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum, i);
256 rcc->pass1_wanted_bits+= s->bit_rate/get_fps(s->avctx); //FIXME misbehaves a little for variable fps
265 void ff_rate_control_uninit(MpegEncContext *s)
267 RateControlContext *rcc= &s->rc_context;
270 av_expr_free(rcc->rc_eq_eval);
271 av_freep(&rcc->entry);
274 if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
275 ff_xvid_rate_control_uninit(s);
279 int ff_vbv_update(MpegEncContext *s, int frame_size){
280 RateControlContext *rcc= &s->rc_context;
281 const double fps= get_fps(s->avctx);
282 const int buffer_size= s->avctx->rc_buffer_size;
283 const double min_rate= s->avctx->rc_min_rate/fps;
284 const double max_rate= s->avctx->rc_max_rate/fps;
286 //av_log(0,0, "%d %f %d %f %f\n", buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate);
290 rcc->buffer_index-= frame_size;
291 if(rcc->buffer_index < 0){
292 av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n");
293 rcc->buffer_index= 0;
296 left= buffer_size - rcc->buffer_index - 1;
297 rcc->buffer_index += av_clip(left, min_rate, max_rate);
299 if(rcc->buffer_index > buffer_size){
300 int stuffing= ceil((rcc->buffer_index - buffer_size)/8);
302 if(stuffing < 4 && s->codec_id == AV_CODEC_ID_MPEG4)
304 rcc->buffer_index -= 8*stuffing;
306 if(s->avctx->debug & FF_DEBUG_RC)
307 av_log(s->avctx, AV_LOG_DEBUG, "stuffing %d bytes\n", stuffing);
316 * Modify the bitrate curve from pass1 for one frame.
318 static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num){
319 RateControlContext *rcc= &s->rc_context;
320 AVCodecContext *a= s->avctx;
322 const int pict_type= rce->new_pict_type;
323 const double mb_num= s->mb_num;
326 double const_values[]={
329 rce->i_tex_bits*rce->qscale,
330 rce->p_tex_bits*rce->qscale,
331 (rce->i_tex_bits + rce->p_tex_bits)*(double)rce->qscale,
333 rce->pict_type == AV_PICTURE_TYPE_B ? (rce->f_code + rce->b_code)*0.5 : rce->f_code,
335 rce->mc_mb_var_sum/mb_num,
336 rce->mb_var_sum/mb_num,
337 rce->pict_type == AV_PICTURE_TYPE_I,
338 rce->pict_type == AV_PICTURE_TYPE_P,
339 rce->pict_type == AV_PICTURE_TYPE_B,
340 rcc->qscale_sum[pict_type] / (double)rcc->frame_count[pict_type],
342 /* rcc->last_qscale_for[AV_PICTURE_TYPE_I],
343 rcc->last_qscale_for[AV_PICTURE_TYPE_P],
344 rcc->last_qscale_for[AV_PICTURE_TYPE_B],
345 rcc->next_non_b_qscale,*/
346 rcc->i_cplx_sum[AV_PICTURE_TYPE_I] / (double)rcc->frame_count[AV_PICTURE_TYPE_I],
347 rcc->i_cplx_sum[AV_PICTURE_TYPE_P] / (double)rcc->frame_count[AV_PICTURE_TYPE_P],
348 rcc->p_cplx_sum[AV_PICTURE_TYPE_P] / (double)rcc->frame_count[AV_PICTURE_TYPE_P],
349 rcc->p_cplx_sum[AV_PICTURE_TYPE_B] / (double)rcc->frame_count[AV_PICTURE_TYPE_B],
350 (rcc->i_cplx_sum[pict_type] + rcc->p_cplx_sum[pict_type]) / (double)rcc->frame_count[pict_type],
354 bits = av_expr_eval(rcc->rc_eq_eval, const_values, rce);
356 av_log(s->avctx, AV_LOG_ERROR, "Error evaluating rc_eq \"%s\"\n", s->avctx->rc_eq);
360 rcc->pass1_rc_eq_output_sum+= bits;
362 if(bits<0.0) bits=0.0;
363 bits+= 1.0; //avoid 1/0 issues
366 for(i=0; i<s->avctx->rc_override_count; i++){
367 RcOverride *rco= s->avctx->rc_override;
368 if(rco[i].start_frame > frame_num) continue;
369 if(rco[i].end_frame < frame_num) continue;
372 bits= qp2bits(rce, rco[i].qscale); //FIXME move at end to really force it?
374 bits*= rco[i].quality_factor;
377 q= bits2qp(rce, bits);
380 if (pict_type==AV_PICTURE_TYPE_I && s->avctx->i_quant_factor<0.0)
381 q= -q*s->avctx->i_quant_factor + s->avctx->i_quant_offset;
382 else if(pict_type==AV_PICTURE_TYPE_B && s->avctx->b_quant_factor<0.0)
383 q= -q*s->avctx->b_quant_factor + s->avctx->b_quant_offset;
389 static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q){
390 RateControlContext *rcc= &s->rc_context;
391 AVCodecContext *a= s->avctx;
392 const int pict_type= rce->new_pict_type;
393 const double last_p_q = rcc->last_qscale_for[AV_PICTURE_TYPE_P];
394 const double last_non_b_q= rcc->last_qscale_for[rcc->last_non_b_pict_type];
396 if (pict_type==AV_PICTURE_TYPE_I && (a->i_quant_factor>0.0 || rcc->last_non_b_pict_type==AV_PICTURE_TYPE_P))
397 q= last_p_q *FFABS(a->i_quant_factor) + a->i_quant_offset;
398 else if(pict_type==AV_PICTURE_TYPE_B && a->b_quant_factor>0.0)
399 q= last_non_b_q* a->b_quant_factor + a->b_quant_offset;
402 /* last qscale / qdiff stuff */
403 if(rcc->last_non_b_pict_type==pict_type || pict_type!=AV_PICTURE_TYPE_I){
404 double last_q= rcc->last_qscale_for[pict_type];
405 const int maxdiff= FF_QP2LAMBDA * a->max_qdiff;
407 if (q > last_q + maxdiff) q= last_q + maxdiff;
408 else if(q < last_q - maxdiff) q= last_q - maxdiff;
411 rcc->last_qscale_for[pict_type]= q; //Note we cannot do that after blurring
413 if(pict_type!=AV_PICTURE_TYPE_B)
414 rcc->last_non_b_pict_type= pict_type;
420 * Get the qmin & qmax for pict_type.
422 static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pict_type){
423 int qmin= s->avctx->lmin;
424 int qmax= s->avctx->lmax;
426 assert(qmin <= qmax);
428 if(pict_type==AV_PICTURE_TYPE_B){
429 qmin= (int)(qmin*FFABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
430 qmax= (int)(qmax*FFABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
431 }else if(pict_type==AV_PICTURE_TYPE_I){
432 qmin= (int)(qmin*FFABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
433 qmax= (int)(qmax*FFABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
436 qmin= av_clip(qmin, 1, FF_LAMBDA_MAX);
437 qmax= av_clip(qmax, 1, FF_LAMBDA_MAX);
439 if(qmax<qmin) qmax= qmin;
445 static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q, int frame_num){
446 RateControlContext *rcc= &s->rc_context;
448 const int pict_type= rce->new_pict_type;
449 const double buffer_size= s->avctx->rc_buffer_size;
450 const double fps= get_fps(s->avctx);
451 const double min_rate= s->avctx->rc_min_rate / fps;
452 const double max_rate= s->avctx->rc_max_rate / fps;
454 get_qminmax(&qmin, &qmax, s, pict_type);
457 if(s->avctx->rc_qmod_freq && frame_num%s->avctx->rc_qmod_freq==0 && pict_type==AV_PICTURE_TYPE_P)
458 q*= s->avctx->rc_qmod_amp;
460 //printf("q:%f\n", q);
461 /* buffer overflow/underflow protection */
463 double expected_size= rcc->buffer_index;
467 double d= 2*(buffer_size - expected_size)/buffer_size;
469 else if(d<0.0001) d=0.0001;
470 q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
472 q_limit= bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index) * s->avctx->rc_min_vbv_overflow_use, 1));
474 if(s->avctx->debug&FF_DEBUG_RC){
475 av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
482 double d= 2*expected_size/buffer_size;
484 else if(d<0.0001) d=0.0001;
485 q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
487 q_limit= bits2qp(rce, FFMAX(rcc->buffer_index * s->avctx->rc_max_available_vbv_use, 1));
489 if(s->avctx->debug&FF_DEBUG_RC){
490 av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
496 //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);
497 if(s->avctx->rc_qsquish==0.0 || qmin==qmax){
499 else if(q>qmax) q=qmax;
501 double min2= log(qmin);
502 double max2= log(qmax);
505 q= (q - min2)/(max2-min2) - 0.5;
507 q= 1.0/(1.0 + exp(q));
508 q= q*(max2-min2) + min2;
516 //----------------------------------
519 static double predict_size(Predictor *p, double q, double var)
521 return p->coeff*var / (q*p->count);
524 static void update_predictor(Predictor *p, double q, double var, double size)
526 double new_coeff= size*q / (var + 1);
532 p->coeff+= new_coeff;
535 static void adaptive_quantization(MpegEncContext *s, double q){
537 const float lumi_masking= s->avctx->lumi_masking / (128.0*128.0);
538 const float dark_masking= s->avctx->dark_masking / (128.0*128.0);
539 const float temp_cplx_masking= s->avctx->temporal_cplx_masking;
540 const float spatial_cplx_masking = s->avctx->spatial_cplx_masking;
541 const float p_masking = s->avctx->p_masking;
542 const float border_masking = s->avctx->border_masking;
545 float *cplx_tab = s->cplx_tab;
546 float *bits_tab = s->bits_tab;
547 const int qmin= s->avctx->mb_lmin;
548 const int qmax= s->avctx->mb_lmax;
549 Picture * const pic= &s->current_picture;
550 const int mb_width = s->mb_width;
551 const int mb_height = s->mb_height;
553 for(i=0; i<s->mb_num; i++){
554 const int mb_xy= s->mb_index2xy[i];
555 float temp_cplx= sqrt(pic->mc_mb_var[mb_xy]); //FIXME merge in pow()
556 float spat_cplx= sqrt(pic->mb_var[mb_xy]);
557 const int lumi= pic->mb_mean[mb_xy];
558 float bits, cplx, factor;
559 int mb_x = mb_xy % s->mb_stride;
560 int mb_y = mb_xy / s->mb_stride;
562 float mb_factor = 0.0;
563 if(spat_cplx < 4) spat_cplx= 4; //FIXME finetune
564 if(temp_cplx < 4) temp_cplx= 4; //FIXME finetune
566 if((s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_INTRA)){//FIXME hq mode
568 factor= 1.0 + p_masking;
571 factor= pow(temp_cplx, - temp_cplx_masking);
573 factor*=pow(spat_cplx, - spatial_cplx_masking);
576 factor*= (1.0 - (lumi-128)*(lumi-128)*lumi_masking);
578 factor*= (1.0 - (lumi-128)*(lumi-128)*dark_masking);
580 if(mb_x < mb_width/5){
581 mb_distance = mb_width/5 - mb_x;
582 mb_factor = (float)mb_distance / (float)(mb_width/5);
583 }else if(mb_x > 4*mb_width/5){
584 mb_distance = mb_x - 4*mb_width/5;
585 mb_factor = (float)mb_distance / (float)(mb_width/5);
587 if(mb_y < mb_height/5){
588 mb_distance = mb_height/5 - mb_y;
589 mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
590 }else if(mb_y > 4*mb_height/5){
591 mb_distance = mb_y - 4*mb_height/5;
592 mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
595 factor*= 1.0 - border_masking*mb_factor;
597 if(factor<0.00001) factor= 0.00001;
606 /* handle qmin/qmax clipping */
607 if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
608 float factor= bits_sum/cplx_sum;
609 for(i=0; i<s->mb_num; i++){
610 float newq= q*cplx_tab[i]/bits_tab[i];
614 bits_sum -= bits_tab[i];
615 cplx_sum -= cplx_tab[i]*q/qmax;
617 else if(newq < qmin){
618 bits_sum -= bits_tab[i];
619 cplx_sum -= cplx_tab[i]*q/qmin;
622 if(bits_sum < 0.001) bits_sum= 0.001;
623 if(cplx_sum < 0.001) cplx_sum= 0.001;
626 for(i=0; i<s->mb_num; i++){
627 const int mb_xy= s->mb_index2xy[i];
628 float newq= q*cplx_tab[i]/bits_tab[i];
631 if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
632 newq*= bits_sum/cplx_sum;
635 intq= (int)(newq + 0.5);
637 if (intq > qmax) intq= qmax;
638 else if(intq < qmin) intq= qmin;
639 //if(i%s->mb_width==0) printf("\n");
640 //printf("%2d%3d ", intq, ff_sqrt(s->mc_mb_var[i]));
641 s->lambda_table[mb_xy]= intq;
645 void ff_get_2pass_fcode(MpegEncContext *s){
646 RateControlContext *rcc= &s->rc_context;
647 int picture_number= s->picture_number;
648 RateControlEntry *rce;
650 rce= &rcc->entry[picture_number];
651 s->f_code= rce->f_code;
652 s->b_code= rce->b_code;
655 //FIXME rd or at least approx for dquant
657 float ff_rate_estimate_qscale(MpegEncContext *s, int dry_run)
661 float br_compensation;
665 int picture_number= s->picture_number;
667 RateControlContext *rcc= &s->rc_context;
668 AVCodecContext *a= s->avctx;
669 RateControlEntry local_rce, *rce;
673 const int pict_type= s->pict_type;
674 Picture * const pic= &s->current_picture;
678 if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
679 return ff_xvid_rate_estimate_qscale(s, dry_run);
682 get_qminmax(&qmin, &qmax, s, pict_type);
684 fps= get_fps(s->avctx);
685 //printf("input_pic_num:%d pic_num:%d frame_rate:%d\n", s->input_picture_number, s->picture_number, s->frame_rate);
686 /* update predictors */
687 if(picture_number>2 && !dry_run){
688 const int last_var= s->last_pict_type == AV_PICTURE_TYPE_I ? rcc->last_mb_var_sum : rcc->last_mc_mb_var_sum;
689 av_assert1(s->frame_bits >= s->stuffing_bits);
690 update_predictor(&rcc->pred[s->last_pict_type], rcc->last_qscale, sqrt(last_var), s->frame_bits - s->stuffing_bits);
693 if(s->flags&CODEC_FLAG_PASS2){
694 assert(picture_number>=0);
695 assert(picture_number<rcc->num_entries);
696 rce= &rcc->entry[picture_number];
697 wanted_bits= rce->expected_bits;
702 //FIXME add a dts field to AVFrame and ensure its set and use it here instead of reordering
703 //but the reordering is simpler for now until h.264 b pyramid must be handeld
704 if(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay)
705 dts_pic= s->current_picture_ptr;
707 dts_pic= s->last_picture_ptr;
710 // av_log(NULL, AV_LOG_ERROR, "%"PRId64" %"PRId64" %"PRId64" %d\n", s->current_picture_ptr->pts, s->user_specified_pts, dts_pic->pts, picture_number);
712 if (!dts_pic || dts_pic->f.pts == AV_NOPTS_VALUE)
713 wanted_bits= (uint64_t)(s->bit_rate*(double)picture_number/fps);
715 wanted_bits = (uint64_t)(s->bit_rate*(double)dts_pic->f.pts / fps);
718 diff= s->total_bits - wanted_bits;
719 br_compensation= (a->bit_rate_tolerance - diff)/a->bit_rate_tolerance;
720 if(br_compensation<=0.0) br_compensation=0.001;
722 var= pict_type == AV_PICTURE_TYPE_I ? pic->mb_var_sum : pic->mc_mb_var_sum;
724 short_term_q = 0; /* avoid warning */
725 if(s->flags&CODEC_FLAG_PASS2){
726 if(pict_type!=AV_PICTURE_TYPE_I)
727 assert(pict_type == rce->new_pict_type);
729 q= rce->new_qscale / br_compensation;
730 //printf("%f %f %f last:%d var:%d type:%d//\n", q, rce->new_qscale, br_compensation, s->frame_bits, var, pict_type);
733 rce->new_pict_type= pict_type;
734 rce->mc_mb_var_sum= pic->mc_mb_var_sum;
735 rce->mb_var_sum = pic-> mb_var_sum;
736 rce->qscale = FF_QP2LAMBDA * 2;
737 rce->f_code = s->f_code;
738 rce->b_code = s->b_code;
741 bits= predict_size(&rcc->pred[pict_type], rce->qscale, sqrt(var));
742 if(pict_type== AV_PICTURE_TYPE_I){
743 rce->i_count = s->mb_num;
744 rce->i_tex_bits= bits;
748 rce->i_count = 0; //FIXME we do know this approx
750 rce->p_tex_bits= bits*0.9;
752 rce->mv_bits= bits*0.1;
754 rcc->i_cplx_sum [pict_type] += rce->i_tex_bits*rce->qscale;
755 rcc->p_cplx_sum [pict_type] += rce->p_tex_bits*rce->qscale;
756 rcc->mv_bits_sum[pict_type] += rce->mv_bits;
757 rcc->frame_count[pict_type] ++;
759 bits= rce->i_tex_bits + rce->p_tex_bits;
760 rate_factor= rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum * br_compensation;
762 q= get_qscale(s, rce, rate_factor, picture_number);
768 q= get_diff_limited_q(s, rce, q);
772 if(pict_type==AV_PICTURE_TYPE_P || s->intra_only){ //FIXME type dependent blur like in 2-pass
773 rcc->short_term_qsum*=a->qblur;
774 rcc->short_term_qcount*=a->qblur;
776 rcc->short_term_qsum+= q;
777 rcc->short_term_qcount++;
779 q= short_term_q= rcc->short_term_qsum/rcc->short_term_qcount;
784 q= modify_qscale(s, rce, q, picture_number);
786 rcc->pass1_wanted_bits+= s->bit_rate/fps;
791 if(s->avctx->debug&FF_DEBUG_RC){
792 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",
793 av_get_picture_type_char(pict_type), qmin, q, qmax, picture_number, (int)wanted_bits/1000, (int)s->total_bits/1000,
794 br_compensation, short_term_q, s->frame_bits, pic->mb_var_sum, pic->mc_mb_var_sum, s->bit_rate/1000, (int)fps
799 else if(q>qmax) q=qmax;
801 if(s->adaptive_quant)
802 adaptive_quantization(s, q);
808 rcc->last_mc_mb_var_sum= pic->mc_mb_var_sum;
809 rcc->last_mb_var_sum= pic->mb_var_sum;
814 //----------------------------------------------
817 static int init_pass2(MpegEncContext *s)
819 RateControlContext *rcc= &s->rc_context;
820 AVCodecContext *a= s->avctx;
822 double fps= get_fps(s->avctx);
823 double complexity[5]={0,0,0,0,0}; // aproximate bits at quant=1
824 uint64_t const_bits[5]={0,0,0,0,0}; // quantizer independent bits
825 uint64_t all_const_bits;
826 uint64_t all_available_bits= (uint64_t)(s->bit_rate*(double)rcc->num_entries/fps);
827 double rate_factor=0;
829 //int last_i_frame=-10000000;
830 const int filter_size= (int)(a->qblur*4) | 1;
831 double expected_bits;
832 double *qscale, *blurred_qscale, qscale_sum;
834 /* find complexity & const_bits & decide the pict_types */
835 for(i=0; i<rcc->num_entries; i++){
836 RateControlEntry *rce= &rcc->entry[i];
838 rce->new_pict_type= rce->pict_type;
839 rcc->i_cplx_sum [rce->pict_type] += rce->i_tex_bits*rce->qscale;
840 rcc->p_cplx_sum [rce->pict_type] += rce->p_tex_bits*rce->qscale;
841 rcc->mv_bits_sum[rce->pict_type] += rce->mv_bits;
842 rcc->frame_count[rce->pict_type] ++;
844 complexity[rce->new_pict_type]+= (rce->i_tex_bits+ rce->p_tex_bits)*(double)rce->qscale;
845 const_bits[rce->new_pict_type]+= rce->mv_bits + rce->misc_bits;
847 all_const_bits= const_bits[AV_PICTURE_TYPE_I] + const_bits[AV_PICTURE_TYPE_P] + const_bits[AV_PICTURE_TYPE_B];
849 if(all_available_bits < all_const_bits){
850 av_log(s->avctx, AV_LOG_ERROR, "requested bitrate is too low\n");
854 qscale= av_malloc(sizeof(double)*rcc->num_entries);
855 blurred_qscale= av_malloc(sizeof(double)*rcc->num_entries);
858 for(step=256*256; step>0.0000001; step*=0.5){
862 rcc->buffer_index= s->avctx->rc_buffer_size/2;
865 for(i=0; i<rcc->num_entries; i++){
866 RateControlEntry *rce= &rcc->entry[i];
867 qscale[i]= get_qscale(s, &rcc->entry[i], rate_factor, i);
868 rcc->last_qscale_for[rce->pict_type] = qscale[i];
870 assert(filter_size%2==1);
872 /* fixed I/B QP relative to P mode */
873 for(i=FFMAX(0, rcc->num_entries-300); i<rcc->num_entries; i++){
874 RateControlEntry *rce= &rcc->entry[i];
876 qscale[i]= get_diff_limited_q(s, rce, qscale[i]);
879 for(i=rcc->num_entries-1; i>=0; i--){
880 RateControlEntry *rce= &rcc->entry[i];
882 qscale[i]= get_diff_limited_q(s, rce, qscale[i]);
886 for(i=0; i<rcc->num_entries; i++){
887 RateControlEntry *rce= &rcc->entry[i];
888 const int pict_type= rce->new_pict_type;
890 double q=0.0, sum=0.0;
892 for(j=0; j<filter_size; j++){
893 int index= i+j-filter_size/2;
895 double coeff= a->qblur==0 ? 1.0 : exp(-d*d/(a->qblur * a->qblur));
897 if(index < 0 || index >= rcc->num_entries) continue;
898 if(pict_type != rcc->entry[index].new_pict_type) continue;
899 q+= qscale[index] * coeff;
902 blurred_qscale[i]= q/sum;
905 /* find expected bits */
906 for(i=0; i<rcc->num_entries; i++){
907 RateControlEntry *rce= &rcc->entry[i];
909 rce->new_qscale= modify_qscale(s, rce, blurred_qscale[i], i);
910 bits= qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits;
911 //printf("%d %f\n", rce->new_bits, blurred_qscale[i]);
912 bits += 8*ff_vbv_update(s, bits);
914 rce->expected_bits= expected_bits;
915 expected_bits += bits;
919 av_log(s->avctx, AV_LOG_INFO,
920 "expected_bits: %f all_available_bits: %d rate_factor: %f\n",
921 expected_bits, (int)all_available_bits, rate_factor);
923 if(expected_bits > all_available_bits) {
929 av_free(blurred_qscale);
931 /* check bitrate calculations and print info */
933 for(i=0; i<rcc->num_entries; i++){
934 /* av_log(s->avctx, AV_LOG_DEBUG, "[lavc rc] entry[%d].new_qscale = %.3f qp = %.3f\n",
935 i, rcc->entry[i].new_qscale, rcc->entry[i].new_qscale / FF_QP2LAMBDA); */
936 qscale_sum += av_clip(rcc->entry[i].new_qscale / FF_QP2LAMBDA, s->avctx->qmin, s->avctx->qmax);
938 assert(toobig <= 40);
939 av_log(s->avctx, AV_LOG_DEBUG,
940 "[lavc rc] requested bitrate: %d bps expected bitrate: %d bps\n",
942 (int)(expected_bits / ((double)all_available_bits/s->bit_rate)));
943 av_log(s->avctx, AV_LOG_DEBUG,
944 "[lavc rc] estimated target average qp: %.3f\n",
945 (float)qscale_sum / rcc->num_entries);
947 av_log(s->avctx, AV_LOG_INFO,
948 "[lavc rc] Using all of requested bitrate is not "
949 "necessary for this video with these parameters.\n");
950 } else if (toobig == 40) {
951 av_log(s->avctx, AV_LOG_ERROR,
952 "[lavc rc] Error: bitrate too low for this video "
953 "with these parameters.\n");
955 } else if (fabs(expected_bits/all_available_bits - 1.0) > 0.01) {
956 av_log(s->avctx, AV_LOG_ERROR,
957 "[lavc rc] Error: 2pass curve failed to converge\n");