ratecontrol.c
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1 /*
2  * Rate control for video encoders
3  *
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of Libav.
7  *
8  * Libav 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.
12  *
13  * Libav 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.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
28 #include "libavutil/intmath.h"
29 #include "avcodec.h"
30 #include "dsputil.h"
31 #include "ratecontrol.h"
32 #include "mpegvideo.h"
33 #include "libavutil/eval.h"
34 
35 #undef NDEBUG // Always check asserts, the speed effect is far too small to disable them.
36 #include <assert.h>
37 
38 #ifndef M_E
39 #define M_E 2.718281828
40 #endif
41 
42 static int init_pass2(MpegEncContext *s);
43 static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num);
44 
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",
50 }
51 
52 static inline double qp2bits(RateControlEntry *rce, double qp){
53  if(qp<=0.0){
54  av_log(NULL, AV_LOG_ERROR, "qp<=0.0\n");
55  }
56  return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ qp;
57 }
58 
59 static inline double bits2qp(RateControlEntry *rce, double bits){
60  if(bits<0.9){
61  av_log(NULL, AV_LOG_ERROR, "bits<0.9\n");
62  }
63  return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ bits;
64 }
65 
67 {
69  int i, res;
70  static const char * const const_names[]={
71  "PI",
72  "E",
73  "iTex",
74  "pTex",
75  "tex",
76  "mv",
77  "fCode",
78  "iCount",
79  "mcVar",
80  "var",
81  "isI",
82  "isP",
83  "isB",
84  "avgQP",
85  "qComp",
86 /* "lastIQP",
87  "lastPQP",
88  "lastBQP",
89  "nextNonBQP",*/
90  "avgIITex",
91  "avgPITex",
92  "avgPPTex",
93  "avgBPTex",
94  "avgTex",
95  NULL
96  };
97  static double (* const func1[])(void *, double)={
98  (void *)bits2qp,
99  (void *)qp2bits,
100  NULL
101  };
102  static const char * const func1_names[]={
103  "bits2qp",
104  "qp2bits",
105  NULL
106  };
107  emms_c();
108 
109  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);
110  if (res < 0) {
111  av_log(s->avctx, AV_LOG_ERROR, "Error parsing rc_eq \"%s\"\n", s->avctx->rc_eq);
112  return res;
113  }
114 
115  for(i=0; i<5; i++){
116  rcc->pred[i].coeff= FF_QP2LAMBDA * 7.0;
117  rcc->pred[i].count= 1.0;
118 
119  rcc->pred[i].decay= 0.4;
120  rcc->i_cplx_sum [i]=
121  rcc->p_cplx_sum [i]=
122  rcc->mv_bits_sum[i]=
123  rcc->qscale_sum [i]=
124  rcc->frame_count[i]= 1; // 1 is better because of 1/0 and such
125  rcc->last_qscale_for[i]=FF_QP2LAMBDA * 5;
126  }
128 
129  if(s->flags&CODEC_FLAG_PASS2){
130  int i;
131  char *p;
132 
133  /* find number of pics */
134  p= s->avctx->stats_in;
135  for(i=-1; p; i++){
136  p= strchr(p+1, ';');
137  }
138  i+= s->max_b_frames;
139  if(i<=0 || i>=INT_MAX / sizeof(RateControlEntry))
140  return -1;
141  rcc->entry = av_mallocz(i*sizeof(RateControlEntry));
142  rcc->num_entries= i;
143 
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];
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;
151  }
152 
153  /* read stats */
154  p= s->avctx->stats_in;
155  for(i=0; i<rcc->num_entries - s->max_b_frames; i++){
156  RateControlEntry *rce;
157  int picture_number;
158  int e;
159  char *next;
160 
161  next= strchr(p, ';');
162  if(next){
163  (*next)=0; //sscanf in unbelievably slow on looong strings //FIXME copy / do not write
164  next++;
165  }
166  e= sscanf(p, " in:%d ", &picture_number);
167 
168  assert(picture_number >= 0);
169  assert(picture_number < rcc->num_entries);
170  rce= &rcc->entry[picture_number];
171 
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);
175  if(e!=14){
176  av_log(s->avctx, AV_LOG_ERROR, "statistics are damaged at line %d, parser out=%d\n", i, e);
177  return -1;
178  }
179 
180  p= next;
181  }
182 
183  if(init_pass2(s) < 0) return -1;
184 
185  //FIXME maybe move to end
187 #if CONFIG_LIBXVID
188  return ff_xvid_rate_control_init(s);
189 #else
190  av_log(s->avctx, AV_LOG_ERROR, "Xvid ratecontrol requires libavcodec compiled with Xvid support.\n");
191  return -1;
192 #endif
193  }
194  }
195 
196  if(!(s->flags&CODEC_FLAG_PASS2)){
197 
198  rcc->short_term_qsum=0.001;
199  rcc->short_term_qcount=0.001;
200 
201  rcc->pass1_rc_eq_output_sum= 0.001;
202  rcc->pass1_wanted_bits=0.001;
203 
204  if(s->avctx->qblur > 1.0){
205  av_log(s->avctx, AV_LOG_ERROR, "qblur too large\n");
206  return -1;
207  }
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;
213 
214  if (i%((s->gop_size+3)/4)==0) rce.pict_type= AV_PICTURE_TYPE_I;
215  else if(i%(s->max_b_frames+1)) rce.pict_type= AV_PICTURE_TYPE_B;
216  else rce.pict_type= AV_PICTURE_TYPE_P;
217 
218  rce.new_pict_type= rce.pict_type;
219  rce.mc_mb_var_sum= bits*s->mb_num/100000;
220  rce.mb_var_sum = s->mb_num;
221  rce.qscale = FF_QP2LAMBDA * 2;
222  rce.f_code = 2;
223  rce.b_code = 1;
224  rce.misc_bits= 1;
225 
226  if(s->pict_type== AV_PICTURE_TYPE_I){
227  rce.i_count = s->mb_num;
228  rce.i_tex_bits= bits;
229  rce.p_tex_bits= 0;
230  rce.mv_bits= 0;
231  }else{
232  rce.i_count = 0; //FIXME we do know this approx
233  rce.i_tex_bits= 0;
234  rce.p_tex_bits= bits*0.9;
235  rce.mv_bits= bits*0.1;
236  }
237  rcc->i_cplx_sum [rce.pict_type] += rce.i_tex_bits*rce.qscale;
238  rcc->p_cplx_sum [rce.pict_type] += rce.p_tex_bits*rce.qscale;
239  rcc->mv_bits_sum[rce.pict_type] += rce.mv_bits;
240  rcc->frame_count[rce.pict_type] ++;
241 
242  get_qscale(s, &rce, rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum, i);
243  rcc->pass1_wanted_bits+= s->bit_rate/(1/av_q2d(s->avctx->time_base)); //FIXME misbehaves a little for variable fps
244  }
245  }
246 
247  }
248 
249  return 0;
250 }
251 
253 {
254  RateControlContext *rcc= &s->rc_context;
255  emms_c();
256 
257  av_expr_free(rcc->rc_eq_eval);
258  av_freep(&rcc->entry);
259 
260 #if CONFIG_LIBXVID
263 #endif
264 }
265 
267  RateControlContext *rcc= &s->rc_context;
268  const double fps= 1/av_q2d(s->avctx->time_base);
269  const int buffer_size= s->avctx->rc_buffer_size;
270  const double min_rate= s->avctx->rc_min_rate/fps;
271  const double max_rate= s->avctx->rc_max_rate/fps;
272 
273  av_dlog(s, "%d %f %d %f %f\n",
274  buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate);
275  if(buffer_size){
276  int left;
277 
278  rcc->buffer_index-= frame_size;
279  if(rcc->buffer_index < 0){
280  av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n");
281  rcc->buffer_index= 0;
282  }
283 
284  left= buffer_size - rcc->buffer_index - 1;
285  rcc->buffer_index += av_clip(left, min_rate, max_rate);
286 
287  if(rcc->buffer_index > buffer_size){
288  int stuffing= ceil((rcc->buffer_index - buffer_size)/8);
289 
290  if(stuffing < 4 && s->codec_id == AV_CODEC_ID_MPEG4)
291  stuffing=4;
292  rcc->buffer_index -= 8*stuffing;
293 
294  if(s->avctx->debug & FF_DEBUG_RC)
295  av_log(s->avctx, AV_LOG_DEBUG, "stuffing %d bytes\n", stuffing);
296 
297  return stuffing;
298  }
299  }
300  return 0;
301 }
302 
306 static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num){
307  RateControlContext *rcc= &s->rc_context;
308  AVCodecContext *a= s->avctx;
309  double q, bits;
310  const int pict_type= rce->new_pict_type;
311  const double mb_num= s->mb_num;
312  int i;
313 
314  double const_values[]={
315  M_PI,
316  M_E,
317  rce->i_tex_bits*rce->qscale,
318  rce->p_tex_bits*rce->qscale,
319  (rce->i_tex_bits + rce->p_tex_bits)*(double)rce->qscale,
320  rce->mv_bits/mb_num,
321  rce->pict_type == AV_PICTURE_TYPE_B ? (rce->f_code + rce->b_code)*0.5 : rce->f_code,
322  rce->i_count/mb_num,
323  rce->mc_mb_var_sum/mb_num,
324  rce->mb_var_sum/mb_num,
328  rcc->qscale_sum[pict_type] / (double)rcc->frame_count[pict_type],
329  a->qcompress,
330 /* rcc->last_qscale_for[AV_PICTURE_TYPE_I],
331  rcc->last_qscale_for[AV_PICTURE_TYPE_P],
332  rcc->last_qscale_for[AV_PICTURE_TYPE_B],
333  rcc->next_non_b_qscale,*/
338  (rcc->i_cplx_sum[pict_type] + rcc->p_cplx_sum[pict_type]) / (double)rcc->frame_count[pict_type],
339  0
340  };
341 
342  bits = av_expr_eval(rcc->rc_eq_eval, const_values, rce);
343  if (isnan(bits)) {
344  av_log(s->avctx, AV_LOG_ERROR, "Error evaluating rc_eq \"%s\"\n", s->avctx->rc_eq);
345  return -1;
346  }
347 
349  bits*=rate_factor;
350  if(bits<0.0) bits=0.0;
351  bits+= 1.0; //avoid 1/0 issues
352 
353  /* user override */
354  for(i=0; i<s->avctx->rc_override_count; i++){
355  RcOverride *rco= s->avctx->rc_override;
356  if(rco[i].start_frame > frame_num) continue;
357  if(rco[i].end_frame < frame_num) continue;
358 
359  if(rco[i].qscale)
360  bits= qp2bits(rce, rco[i].qscale); //FIXME move at end to really force it?
361  else
362  bits*= rco[i].quality_factor;
363  }
364 
365  q= bits2qp(rce, bits);
366 
367  /* I/B difference */
368  if (pict_type==AV_PICTURE_TYPE_I && s->avctx->i_quant_factor<0.0)
369  q= -q*s->avctx->i_quant_factor + s->avctx->i_quant_offset;
370  else if(pict_type==AV_PICTURE_TYPE_B && s->avctx->b_quant_factor<0.0)
371  q= -q*s->avctx->b_quant_factor + s->avctx->b_quant_offset;
372  if(q<1) q=1;
373 
374  return q;
375 }
376 
377 static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q){
378  RateControlContext *rcc= &s->rc_context;
379  AVCodecContext *a= s->avctx;
380  const int pict_type= rce->new_pict_type;
381  const double last_p_q = rcc->last_qscale_for[AV_PICTURE_TYPE_P];
382  const double last_non_b_q= rcc->last_qscale_for[rcc->last_non_b_pict_type];
383 
384  if (pict_type==AV_PICTURE_TYPE_I && (a->i_quant_factor>0.0 || rcc->last_non_b_pict_type==AV_PICTURE_TYPE_P))
385  q= last_p_q *FFABS(a->i_quant_factor) + a->i_quant_offset;
386  else if(pict_type==AV_PICTURE_TYPE_B && a->b_quant_factor>0.0)
387  q= last_non_b_q* a->b_quant_factor + a->b_quant_offset;
388  if(q<1) q=1;
389 
390  /* last qscale / qdiff stuff */
391  if(rcc->last_non_b_pict_type==pict_type || pict_type!=AV_PICTURE_TYPE_I){
392  double last_q= rcc->last_qscale_for[pict_type];
393  const int maxdiff= FF_QP2LAMBDA * a->max_qdiff;
394 
395  if (q > last_q + maxdiff) q= last_q + maxdiff;
396  else if(q < last_q - maxdiff) q= last_q - maxdiff;
397  }
398 
399  rcc->last_qscale_for[pict_type]= q; //Note we cannot do that after blurring
400 
401  if(pict_type!=AV_PICTURE_TYPE_B)
402  rcc->last_non_b_pict_type= pict_type;
403 
404  return q;
405 }
406 
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;
413 
414  assert(qmin <= qmax);
415 
416  if(pict_type==AV_PICTURE_TYPE_B){
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==AV_PICTURE_TYPE_I){
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);
422  }
423 
424  qmin= av_clip(qmin, 1, FF_LAMBDA_MAX);
425  qmax= av_clip(qmax, 1, FF_LAMBDA_MAX);
426 
427  if(qmax<qmin) qmax= qmin;
428 
429  *qmin_ret= qmin;
430  *qmax_ret= qmax;
431 }
432 
433 static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q, int frame_num){
434  RateControlContext *rcc= &s->rc_context;
435  int qmin, qmax;
436  const int pict_type= rce->new_pict_type;
437  const double buffer_size= s->avctx->rc_buffer_size;
438  const double fps= 1/av_q2d(s->avctx->time_base);
439  const double min_rate= s->avctx->rc_min_rate / fps;
440  const double max_rate= s->avctx->rc_max_rate / fps;
441 
442  get_qminmax(&qmin, &qmax, s, pict_type);
443 
444  /* modulation */
445  if(s->avctx->rc_qmod_freq && frame_num%s->avctx->rc_qmod_freq==0 && pict_type==AV_PICTURE_TYPE_P)
446  q*= s->avctx->rc_qmod_amp;
447 
448  /* buffer overflow/underflow protection */
449  if(buffer_size){
450  double expected_size= rcc->buffer_index;
451  double q_limit;
452 
453  if(min_rate){
454  double d= 2*(buffer_size - expected_size)/buffer_size;
455  if(d>1.0) d=1.0;
456  else if(d<0.0001) d=0.0001;
457  q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
458 
459  q_limit= bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index) * s->avctx->rc_min_vbv_overflow_use, 1));
460  if(q > q_limit){
461  if(s->avctx->debug&FF_DEBUG_RC){
462  av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
463  }
464  q= q_limit;
465  }
466  }
467 
468  if(max_rate){
469  double d= 2*expected_size/buffer_size;
470  if(d>1.0) d=1.0;
471  else if(d<0.0001) d=0.0001;
472  q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
473 
474  q_limit= bits2qp(rce, FFMAX(rcc->buffer_index * s->avctx->rc_max_available_vbv_use, 1));
475  if(q < q_limit){
476  if(s->avctx->debug&FF_DEBUG_RC){
477  av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
478  }
479  q= q_limit;
480  }
481  }
482  }
483  av_dlog(s, "q:%f max:%f min:%f size:%f index:%f agr:%f\n",
484  q, max_rate, min_rate, buffer_size, rcc->buffer_index,
486  if(s->avctx->rc_qsquish==0.0 || qmin==qmax){
487  if (q<qmin) q=qmin;
488  else if(q>qmax) q=qmax;
489  }else{
490  double min2= log(qmin);
491  double max2= log(qmax);
492 
493  q= log(q);
494  q= (q - min2)/(max2-min2) - 0.5;
495  q*= -4.0;
496  q= 1.0/(1.0 + exp(q));
497  q= q*(max2-min2) + min2;
498 
499  q= exp(q);
500  }
501 
502  return q;
503 }
504 
505 //----------------------------------
506 // 1 Pass Code
507 
508 static double predict_size(Predictor *p, double q, double var)
509 {
510  return p->coeff*var / (q*p->count);
511 }
512 
513 static void update_predictor(Predictor *p, double q, double var, double size)
514 {
515  double new_coeff= size*q / (var + 1);
516  if(var<10) return;
517 
518  p->count*= p->decay;
519  p->coeff*= p->decay;
520  p->count++;
521  p->coeff+= new_coeff;
522 }
523 
524 static void adaptive_quantization(MpegEncContext *s, double q){
525  int i;
526  const float lumi_masking= s->avctx->lumi_masking / (128.0*128.0);
527  const float dark_masking= s->avctx->dark_masking / (128.0*128.0);
528  const float temp_cplx_masking= s->avctx->temporal_cplx_masking;
529  const float spatial_cplx_masking = s->avctx->spatial_cplx_masking;
530  const float p_masking = s->avctx->p_masking;
531  const float border_masking = s->avctx->border_masking;
532  float bits_sum= 0.0;
533  float cplx_sum= 0.0;
534  float *cplx_tab = s->cplx_tab;
535  float *bits_tab = s->bits_tab;
536  const int qmin= s->avctx->mb_lmin;
537  const int qmax= s->avctx->mb_lmax;
538  Picture * const pic= &s->current_picture;
539  const int mb_width = s->mb_width;
540  const int mb_height = s->mb_height;
541 
542  for(i=0; i<s->mb_num; i++){
543  const int mb_xy= s->mb_index2xy[i];
544  float temp_cplx= sqrt(pic->mc_mb_var[mb_xy]); //FIXME merge in pow()
545  float spat_cplx= sqrt(pic->mb_var[mb_xy]);
546  const int lumi= pic->mb_mean[mb_xy];
547  float bits, cplx, factor;
548  int mb_x = mb_xy % s->mb_stride;
549  int mb_y = mb_xy / s->mb_stride;
550  int mb_distance;
551  float mb_factor = 0.0;
552  if(spat_cplx < 4) spat_cplx= 4; //FIXME finetune
553  if(temp_cplx < 4) temp_cplx= 4; //FIXME finetune
554 
555  if((s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_INTRA)){//FIXME hq mode
556  cplx= spat_cplx;
557  factor= 1.0 + p_masking;
558  }else{
559  cplx= temp_cplx;
560  factor= pow(temp_cplx, - temp_cplx_masking);
561  }
562  factor*=pow(spat_cplx, - spatial_cplx_masking);
563 
564  if(lumi>127)
565  factor*= (1.0 - (lumi-128)*(lumi-128)*lumi_masking);
566  else
567  factor*= (1.0 - (lumi-128)*(lumi-128)*dark_masking);
568 
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);
575  }
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));
582  }
583 
584  factor*= 1.0 - border_masking*mb_factor;
585 
586  if(factor<0.00001) factor= 0.00001;
587 
588  bits= cplx*factor;
589  cplx_sum+= cplx;
590  bits_sum+= bits;
591  cplx_tab[i]= cplx;
592  bits_tab[i]= bits;
593  }
594 
595  /* handle qmin/qmax clipping */
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];
600  newq*= factor;
601 
602  if (newq > qmax){
603  bits_sum -= bits_tab[i];
604  cplx_sum -= cplx_tab[i]*q/qmax;
605  }
606  else if(newq < qmin){
607  bits_sum -= bits_tab[i];
608  cplx_sum -= cplx_tab[i]*q/qmin;
609  }
610  }
611  if(bits_sum < 0.001) bits_sum= 0.001;
612  if(cplx_sum < 0.001) cplx_sum= 0.001;
613  }
614 
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];
618  int intq;
619 
621  newq*= bits_sum/cplx_sum;
622  }
623 
624  intq= (int)(newq + 0.5);
625 
626  if (intq > qmax) intq= qmax;
627  else if(intq < qmin) intq= qmin;
628  s->lambda_table[mb_xy]= intq;
629  }
630 }
631 
633  RateControlContext *rcc= &s->rc_context;
634  int picture_number= s->picture_number;
635  RateControlEntry *rce;
636 
637  rce= &rcc->entry[picture_number];
638  s->f_code= rce->f_code;
639  s->b_code= rce->b_code;
640 }
641 
642 //FIXME rd or at least approx for dquant
643 
645 {
646  float q;
647  int qmin, qmax;
648  float br_compensation;
649  double diff;
650  double short_term_q;
651  double fps;
652  int picture_number= s->picture_number;
653  int64_t wanted_bits;
654  RateControlContext *rcc= &s->rc_context;
655  AVCodecContext *a= s->avctx;
656  RateControlEntry local_rce, *rce;
657  double bits;
658  double rate_factor;
659  int var;
660  const int pict_type= s->pict_type;
661  Picture * const pic= &s->current_picture;
662  emms_c();
663 
664 #if CONFIG_LIBXVID
666  return ff_xvid_rate_estimate_qscale(s, dry_run);
667 #endif
668 
669  get_qminmax(&qmin, &qmax, s, pict_type);
670 
671  fps= 1/av_q2d(s->avctx->time_base);
672  /* update predictors */
673  if(picture_number>2 && !dry_run){
674  const int last_var= s->last_pict_type == AV_PICTURE_TYPE_I ? rcc->last_mb_var_sum : rcc->last_mc_mb_var_sum;
675  update_predictor(&rcc->pred[s->last_pict_type], rcc->last_qscale, sqrt(last_var), s->frame_bits);
676  }
677 
678  if(s->flags&CODEC_FLAG_PASS2){
679  assert(picture_number>=0);
680  assert(picture_number<rcc->num_entries);
681  rce= &rcc->entry[picture_number];
682  wanted_bits= rce->expected_bits;
683  }else{
684  Picture *dts_pic;
685  rce= &local_rce;
686 
687  //FIXME add a dts field to AVFrame and ensure its set and use it here instead of reordering
688  //but the reordering is simpler for now until h.264 b pyramid must be handeld
689  if(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay)
690  dts_pic= s->current_picture_ptr;
691  else
692  dts_pic= s->last_picture_ptr;
693 
694  if (!dts_pic || dts_pic->f.pts == AV_NOPTS_VALUE)
695  wanted_bits= (uint64_t)(s->bit_rate*(double)picture_number/fps);
696  else
697  wanted_bits = (uint64_t)(s->bit_rate*(double)dts_pic->f.pts / fps);
698  }
699 
700  diff= s->total_bits - wanted_bits;
701  br_compensation= (a->bit_rate_tolerance - diff)/a->bit_rate_tolerance;
702  if(br_compensation<=0.0) br_compensation=0.001;
703 
704  var= pict_type == AV_PICTURE_TYPE_I ? pic->mb_var_sum : pic->mc_mb_var_sum;
705 
706  short_term_q = 0; /* avoid warning */
707  if(s->flags&CODEC_FLAG_PASS2){
708  if(pict_type!=AV_PICTURE_TYPE_I)
709  assert(pict_type == rce->new_pict_type);
710 
711  q= rce->new_qscale / br_compensation;
712  av_dlog(s, "%f %f %f last:%d var:%d type:%d//\n", q, rce->new_qscale,
713  br_compensation, s->frame_bits, var, pict_type);
714  }else{
715  rce->pict_type=
716  rce->new_pict_type= pict_type;
717  rce->mc_mb_var_sum= pic->mc_mb_var_sum;
718  rce->mb_var_sum = pic-> mb_var_sum;
719  rce->qscale = FF_QP2LAMBDA * 2;
720  rce->f_code = s->f_code;
721  rce->b_code = s->b_code;
722  rce->misc_bits= 1;
723 
724  bits= predict_size(&rcc->pred[pict_type], rce->qscale, sqrt(var));
725  if(pict_type== AV_PICTURE_TYPE_I){
726  rce->i_count = s->mb_num;
727  rce->i_tex_bits= bits;
728  rce->p_tex_bits= 0;
729  rce->mv_bits= 0;
730  }else{
731  rce->i_count = 0; //FIXME we do know this approx
732  rce->i_tex_bits= 0;
733  rce->p_tex_bits= bits*0.9;
734 
735  rce->mv_bits= bits*0.1;
736  }
737  rcc->i_cplx_sum [pict_type] += rce->i_tex_bits*rce->qscale;
738  rcc->p_cplx_sum [pict_type] += rce->p_tex_bits*rce->qscale;
739  rcc->mv_bits_sum[pict_type] += rce->mv_bits;
740  rcc->frame_count[pict_type] ++;
741 
742  bits= rce->i_tex_bits + rce->p_tex_bits;
743  rate_factor= rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum * br_compensation;
744 
745  q= get_qscale(s, rce, rate_factor, picture_number);
746  if (q < 0)
747  return -1;
748 
749  assert(q>0.0);
750  q= get_diff_limited_q(s, rce, q);
751  assert(q>0.0);
752 
753  if(pict_type==AV_PICTURE_TYPE_P || s->intra_only){ //FIXME type dependent blur like in 2-pass
754  rcc->short_term_qsum*=a->qblur;
755  rcc->short_term_qcount*=a->qblur;
756 
757  rcc->short_term_qsum+= q;
758  rcc->short_term_qcount++;
759  q= short_term_q= rcc->short_term_qsum/rcc->short_term_qcount;
760  }
761  assert(q>0.0);
762 
763  q= modify_qscale(s, rce, q, picture_number);
764 
765  rcc->pass1_wanted_bits+= s->bit_rate/fps;
766 
767  assert(q>0.0);
768  }
769 
770  if(s->avctx->debug&FF_DEBUG_RC){
771  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",
772  av_get_picture_type_char(pict_type), qmin, q, qmax, picture_number, (int)wanted_bits/1000, (int)s->total_bits/1000,
773  br_compensation, short_term_q, s->frame_bits, pic->mb_var_sum, pic->mc_mb_var_sum, s->bit_rate/1000, (int)fps
774  );
775  }
776 
777  if (q<qmin) q=qmin;
778  else if(q>qmax) q=qmax;
779 
780  if(s->adaptive_quant)
781  adaptive_quantization(s, q);
782  else
783  q= (int)(q + 0.5);
784 
785  if(!dry_run){
786  rcc->last_qscale= q;
788  rcc->last_mb_var_sum= pic->mb_var_sum;
789  }
790  return q;
791 }
792 
793 //----------------------------------------------
794 // 2-Pass code
795 
797 {
798  RateControlContext *rcc= &s->rc_context;
799  AVCodecContext *a= s->avctx;
800  int i, toobig;
801  double fps= 1/av_q2d(s->avctx->time_base);
802  double complexity[5]={0,0,0,0,0}; // approximate bits at quant=1
803  uint64_t const_bits[5]={0,0,0,0,0}; // quantizer independent bits
804  uint64_t all_const_bits;
805  uint64_t all_available_bits= (uint64_t)(s->bit_rate*(double)rcc->num_entries/fps);
806  double rate_factor=0;
807  double step;
808  //int last_i_frame=-10000000;
809  const int filter_size= (int)(a->qblur*4) | 1;
810  double expected_bits;
811  double *qscale, *blurred_qscale, qscale_sum;
812 
813  /* find complexity & const_bits & decide the pict_types */
814  for(i=0; i<rcc->num_entries; i++){
815  RateControlEntry *rce= &rcc->entry[i];
816 
817  rce->new_pict_type= rce->pict_type;
818  rcc->i_cplx_sum [rce->pict_type] += rce->i_tex_bits*rce->qscale;
819  rcc->p_cplx_sum [rce->pict_type] += rce->p_tex_bits*rce->qscale;
820  rcc->mv_bits_sum[rce->pict_type] += rce->mv_bits;
821  rcc->frame_count[rce->pict_type] ++;
822 
823  complexity[rce->new_pict_type]+= (rce->i_tex_bits+ rce->p_tex_bits)*(double)rce->qscale;
824  const_bits[rce->new_pict_type]+= rce->mv_bits + rce->misc_bits;
825  }
826  all_const_bits= const_bits[AV_PICTURE_TYPE_I] + const_bits[AV_PICTURE_TYPE_P] + const_bits[AV_PICTURE_TYPE_B];
827 
828  if(all_available_bits < all_const_bits){
829  av_log(s->avctx, AV_LOG_ERROR, "requested bitrate is too low\n");
830  return -1;
831  }
832 
833  qscale= av_malloc(sizeof(double)*rcc->num_entries);
834  blurred_qscale= av_malloc(sizeof(double)*rcc->num_entries);
835  toobig = 0;
836 
837  for(step=256*256; step>0.0000001; step*=0.5){
838  expected_bits=0;
839  rate_factor+= step;
840 
841  rcc->buffer_index= s->avctx->rc_buffer_size/2;
842 
843  /* find qscale */
844  for(i=0; i<rcc->num_entries; i++){
845  RateControlEntry *rce= &rcc->entry[i];
846  qscale[i]= get_qscale(s, &rcc->entry[i], rate_factor, i);
847  rcc->last_qscale_for[rce->pict_type] = qscale[i];
848  }
849  assert(filter_size%2==1);
850 
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];
854 
855  qscale[i]= get_diff_limited_q(s, rce, qscale[i]);
856  }
857 
858  /* smooth curve */
859  for(i=0; i<rcc->num_entries; i++){
860  RateControlEntry *rce= &rcc->entry[i];
861  const int pict_type= rce->new_pict_type;
862  int j;
863  double q=0.0, sum=0.0;
864 
865  for(j=0; j<filter_size; j++){
866  int index= i+j-filter_size/2;
867  double d= index-i;
868  double coeff= a->qblur==0 ? 1.0 : exp(-d*d/(a->qblur * a->qblur));
869 
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;
873  sum+= coeff;
874  }
875  blurred_qscale[i]= q/sum;
876  }
877 
878  /* find expected bits */
879  for(i=0; i<rcc->num_entries; i++){
880  RateControlEntry *rce= &rcc->entry[i];
881  double bits;
882  rce->new_qscale= modify_qscale(s, rce, blurred_qscale[i], i);
883  bits= qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits;
884  bits += 8*ff_vbv_update(s, bits);
885 
886  rce->expected_bits= expected_bits;
887  expected_bits += bits;
888  }
889 
890  av_dlog(s->avctx,
891  "expected_bits: %f all_available_bits: %d rate_factor: %f\n",
892  expected_bits, (int)all_available_bits, rate_factor);
893  if(expected_bits > all_available_bits) {
894  rate_factor-= step;
895  ++toobig;
896  }
897  }
898  av_free(qscale);
899  av_free(blurred_qscale);
900 
901  /* check bitrate calculations and print info */
902  qscale_sum = 0.0;
903  for(i=0; i<rcc->num_entries; i++){
904  av_dlog(s, "[lavc rc] entry[%d].new_qscale = %.3f qp = %.3f\n",
905  i,
906  rcc->entry[i].new_qscale,
907  rcc->entry[i].new_qscale / FF_QP2LAMBDA);
908  qscale_sum += av_clip(rcc->entry[i].new_qscale / FF_QP2LAMBDA, s->avctx->qmin, s->avctx->qmax);
909  }
910  assert(toobig <= 40);
912  "[lavc rc] requested bitrate: %d bps expected bitrate: %d bps\n",
913  s->bit_rate,
914  (int)(expected_bits / ((double)all_available_bits/s->bit_rate)));
916  "[lavc rc] estimated target average qp: %.3f\n",
917  (float)qscale_sum / rcc->num_entries);
918  if (toobig == 0) {
920  "[lavc rc] Using all of requested bitrate is not "
921  "necessary for this video with these parameters.\n");
922  } else if (toobig == 40) {
924  "[lavc rc] Error: bitrate too low for this video "
925  "with these parameters.\n");
926  return -1;
927  } else if (fabs(expected_bits/all_available_bits - 1.0) > 0.01) {
929  "[lavc rc] Error: 2pass curve failed to converge\n");
930  return -1;
931  }
932 
933  return 0;
934 }
int frame_bits
bits used for the current frame
Definition: mpegvideo.h:475
RateControlContext rc_context
contains stuff only accessed in ratecontrol.c
Definition: mpegvideo.h:477
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:61
int picture_number
Definition: mpegvideo.h:245
rate control context.
Definition: ratecontrol.h:63
int size
double pass1_rc_eq_output_sum
sum of the output of the rc equation, this is used for normalization
Definition: ratecontrol.h:71
uint8_t * mb_mean
Table for MB luminance.
Definition: mpegvideo.h:145
float qblur
amount of qscale smoothing over time (0.0-1.0)
Definition: avcodec.h:2278
RateControlEntry * entry
Definition: ratecontrol.h:66
float border_masking
Border processing masking, raises the quantizer for mbs on the borders of the picture.
Definition: avcodec.h:1973
uint16_t * mb_var
Table for MB variances.
Definition: mpegvideo.h:143
int rc_initial_buffer_occupancy
Number of bits which should be loaded into the rc buffer before decoding starts.
Definition: avcodec.h:2376
#define CANDIDATE_MB_TYPE_INTRA
Definition: mpegvideo.h:415
void ff_get_2pass_fcode(MpegEncContext *s)
Definition: ratecontrol.c:632
int mb_lmin
minimum MB lagrange multipler
Definition: avcodec.h:1980
static void update_predictor(Predictor *p, double q, double var, double size)
Definition: ratecontrol.c:513
double count
Definition: ratecontrol.h:37
char * stats_in
pass2 encoding statistics input buffer Concatenated stuff from stats_out of pass1 should be placed he...
Definition: avcodec.h:2510
mpegvideo header.
av_dlog(ac->avr,"%d samples - audio_convert: %s to %s (%s)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic?ac->func_descr_generic:ac->func_descr)
int av_expr_parse(AVExpr **expr, const char *s, const char *const *const_names, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), int log_offset, void *log_ctx)
Parse an expression.
Definition: eval.c:489
int mb_num
number of MBs of a picture
Definition: mpegvideo.h:252
int lmax
maximum Lagrange multipler
Definition: avcodec.h:2409
float i_quant_offset
qscale offset between P and I-frames
Definition: avcodec.h:1657
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1465
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:151
static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pict_type)
Get the qmin & qmax for pict_type.
Definition: ratecontrol.c:410
float p_masking
p block masking (0-> disabled)
Definition: avcodec.h:1685
int bit_rate_tolerance
number of bits the bitstream is allowed to diverge from the reference.
Definition: avcodec.h:1412
int mb_lmax
maximum MB lagrange multipler
Definition: avcodec.h:1987
uint8_t bits
Definition: crc.c:31
static av_always_inline av_const int isnan(float x)
Definition: libm.h:85
float b_quant_factor
qscale factor between IP and B-frames If > 0 then the last P-frame quantizer will be used (q= lastp_q...
Definition: avcodec.h:1597
#define emms_c()
Definition: internal.h:145
int64_t pts
presentation timestamp in time_base units (time when frame should be shown to user) If AV_NOPTS_VALUE...
Definition: avcodec.h:1088
int misc_bits
cbp, mb_type
Definition: mpegvideo.h:488
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:313
int rc_strategy
obsolete FIXME remove
Definition: avcodec.h:1600
static double av_q2d(AVRational a)
Convert rational to double.
Definition: rational.h:69
float * cplx_tab
Definition: mpegvideo.h:713
static const double const_values[]
Definition: opt.c:86
char av_get_picture_type_char(enum AVPictureType pict_type)
Return a single letter to describe the given picture type pict_type.
Definition: utils.c:43
int mb_height
number of MBs horizontally & vertically
Definition: mpegvideo.h:247
float lumi_masking
luminance masking (0-> disabled)
Definition: avcodec.h:1664
char * stats_out
pass1 encoding statistics output buffer
Definition: avcodec.h:2502
float rc_qmod_amp
Definition: avcodec.h:2309
int num_entries
number of RateControlEntries
Definition: ratecontrol.h:65
float quality_factor
Definition: avcodec.h:614
int intra_only
if true, only intra pictures are generated
Definition: mpegvideo.h:217
static const uint8_t frame_size[4]
Definition: g723_1_data.h:47
static void adaptive_quantization(MpegEncContext *s, double q)
Definition: ratecontrol.c:524
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:139
int64_t total_bits
Definition: mpegvideo.h:474
int qmax
maximum quantizer
Definition: avcodec.h:2292
void ff_write_pass1_stats(MpegEncContext *s)
Definition: ratecontrol.c:45
static double predict_size(Predictor *p, double q, double var)
Definition: ratecontrol.c:508
int rc_max_rate
maximum bitrate
Definition: avcodec.h:2339
void ff_rate_control_uninit(MpegEncContext *s)
Definition: ratecontrol.c:252
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:146
float i_quant_factor
qscale factor between P and I-frames If > 0 then the last p frame quantizer will be used (q= lastp_q*...
Definition: avcodec.h:1650
uint16_t * mb_type
Table for candidate MB types for encoding.
Definition: mpegvideo.h:414
const char * rc_eq
rate control equation
Definition: avcodec.h:2332
int low_delay
no reordering needed / has no b-frames
Definition: mpegvideo.h:570
enum AVCodecID codec_id
Definition: mov_chan.c:432
int ff_xvid_rate_control_init(MpegEncContext *s)
Definition: libxvid_rc.c:74
static const char *const const_names[]
Definition: opt.c:93
int rc_buffer_size
decoder bitstream buffer size
Definition: avcodec.h:2317
int * lambda_table
Definition: mpegvideo.h:346
int rc_override_count
ratecontrol override, see RcOverride
Definition: avcodec.h:2324
int display_picture_number
picture number in display order
Definition: avcodec.h:1115
AVExpr * rc_eq_eval
Definition: ratecontrol.h:87
#define M_E
Definition: ratecontrol.c:39
Picture * current_picture_ptr
pointer to the current picture
Definition: mpegvideo.h:317
Picture.
Definition: mpegvideo.h:94
float rc_max_available_vbv_use
Ratecontrol attempt to use, at maximum, of what can be used without an underflow. ...
Definition: avcodec.h:2362
float rc_min_vbv_overflow_use
Ratecontrol attempt to use, at least, times the amount needed to prevent a vbv overflow.
Definition: avcodec.h:2369
float ff_rate_estimate_qscale(MpegEncContext *s, int dry_run)
Definition: ratecontrol.c:644
float rc_qsquish
ratecontrol qmin qmax limiting method 0-> clipping, 1-> use a nice continuous function to limit qscal...
Definition: avcodec.h:2307
int quality
quality (between 1 (good) and FF_LAMBDA_MAX (bad))
Definition: avcodec.h:1122
int max_qdiff
maximum quantizer difference between frames
Definition: avcodec.h:2299
int lmin
minimum Lagrange multipler
Definition: avcodec.h:2402
double pass1_wanted_bits
bits which should have been outputed by the pass1 code (including complexity init) ...
Definition: ratecontrol.h:72
RcOverride * rc_override
Definition: avcodec.h:2325
int * mb_index2xy
mb_index -> mb_x + mb_y*mb_stride
Definition: mpegvideo.h:437
void ff_xvid_rate_control_uninit(MpegEncContext *s)
Definition: libxvid_rc.c:172
NULL
Definition: eval.c:52
uint16_t * mc_mb_var
Table for motion compensated MB variances.
Definition: mpegvideo.h:144
float rc_initial_cplx
initial complexity for pass1 ratecontrol
Definition: avcodec.h:2355
int coded_picture_number
picture number in bitstream order
Definition: avcodec.h:1109
double buffer_index
amount of bits in the video/audio buffer
Definition: ratecontrol.h:67
external API header
void av_expr_free(AVExpr *e)
Free a parsed expression previously created with av_expr_parse().
Definition: eval.c:192
double decay
Definition: ratecontrol.h:38
double coeff
Definition: ratecontrol.h:36
int debug
debug
Definition: avcodec.h:2568
main external API structure.
Definition: avcodec.h:1339
int qmin
minimum quantizer
Definition: avcodec.h:2285
static int start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
Definition: dxva2_h264.c:373
float spatial_cplx_masking
spatial complexity masking (0-> disabled)
Definition: avcodec.h:1678
float rc_buffer_aggressivity
Definition: avcodec.h:2348
int index
Definition: gxfenc.c:72
uint64_t p_cplx_sum[5]
Definition: ratecontrol.h:78
static int step
Definition: avplay.c:252
float b_quant_offset
qscale offset between IP and B-frames
Definition: avcodec.h:1626
int f_code
forward MV resolution
Definition: mpegvideo.h:363
double last_qscale_for[5]
last qscale for a specific pict type, used for max_diff & ipb factor stuff
Definition: ratecontrol.h:74
float qcompress
amount of qscale change between easy & hard scenes (0.0-1.0)
Definition: avcodec.h:2277
int max_b_frames
max number of b-frames for encoding
Definition: mpegvideo.h:232
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:349
int bit_rate
wanted bit rate
Definition: mpegvideo.h:218
float dark_masking
darkness masking (0-> disabled)
Definition: avcodec.h:1692
float temporal_cplx_masking
temporary complexity masking (0-> disabled)
Definition: avcodec.h:1671
uint64_t i_cplx_sum[5]
Definition: ratecontrol.h:77
int rc_qmod_freq
Definition: avcodec.h:2310
double short_term_qsum
sum of recent qscales
Definition: ratecontrol.h:69
MpegEncContext.
Definition: mpegvideo.h:211
uint64_t mv_bits_sum[5]
Definition: ratecontrol.h:79
struct AVCodecContext * avctx
Definition: mpegvideo.h:213
int mb_stride
mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11 ...
Definition: mpegvideo.h:248
static int init_pass2(MpegEncContext *s)
Definition: ratecontrol.c:796
static double qp2bits(RateControlEntry *rce, double qp)
Definition: ratecontrol.c:52
int last_pict_type
Definition: mpegvideo.h:350
int adaptive_quant
use adaptive quantization
Definition: mpegvideo.h:347
Picture * last_picture_ptr
pointer to the previous picture.
Definition: mpegvideo.h:315
Bi-dir predicted.
Definition: avutil.h:247
int ff_rate_control_init(MpegEncContext *s)
Definition: ratecontrol.c:66
int ff_vbv_update(MpegEncContext *s, int frame_size)
Definition: ratecontrol.c:266
static double bits2qp(RateControlEntry *rce, double bits)
Definition: ratecontrol.c:59
uint64_t qscale_sum[5]
Definition: ratecontrol.h:80
DSP utils.
static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num)
Modify the bitrate curve from pass1 for one frame.
Definition: ratecontrol.c:306
double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
Evaluate a previously parsed expression.
Definition: eval.c:539
ratecontrol header.
static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q)
Definition: ratecontrol.c:377
struct AVFrame f
Definition: mpegvideo.h:95
int mb_var_sum
sum of MB variance for current frame
Definition: mpegvideo.h:141
int flags
AVCodecContext.flags (HQ, MV4, ...)
Definition: mpegvideo.h:230
int mc_mb_var_sum
motion compensated MB variance for current frame
Definition: mpegvideo.h:142
uint64_t expected_bits
Definition: ratecontrol.h:49
int rc_min_rate
minimum bitrate
Definition: avcodec.h:2346
int b_code
backward MV resolution for B Frames (mpeg4)
Definition: mpegvideo.h:364
float * bits_tab
Definition: mpegvideo.h:713
double short_term_qcount
count of recent qscales
Definition: ratecontrol.h:70
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:158
Predictor pred[5]
Definition: ratecontrol.h:68
Predicted.
Definition: avutil.h:246
float ff_xvid_rate_estimate_qscale(MpegEncContext *s, int dry_run)
Definition: libxvid_rc.c:121
simple arithmetic expression evaluator
static int end_frame(AVCodecContext *avctx)
Definition: dxva2_h264.c:427
static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q, int frame_num)
Definition: ratecontrol.c:433