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 23/** 24 * @file 25 * Rate control for video encoders. 26 */ 27 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 42static int init_pass2(MpegEncContext *s); 43static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num); 44 45void 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); 50} 51 52static 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 59static 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 66int ff_rate_control_init(MpegEncContext *s) 67{ 68 RateControlContext *rcc= &s->rc_context; 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 } 127 rcc->buffer_index= s->avctx->rc_initial_buffer_occupancy; 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]; 147 rce->pict_type= rce->new_pict_type=AV_PICTURE_TYPE_P; 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 186 if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID) { 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 252void ff_rate_control_uninit(MpegEncContext *s) 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 261 if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID) 262 ff_xvid_rate_control_uninit(s); 263#endif 264} 265 266int ff_vbv_update(MpegEncContext *s, int frame_size){ 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//printf("%d %f %d %f %f\n", buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate); 274 if(buffer_size){ 275 int left; 276 277 rcc->buffer_index-= frame_size; 278 if(rcc->buffer_index < 0){ 279 av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n"); 280 rcc->buffer_index= 0; 281 } 282 283 left= buffer_size - rcc->buffer_index - 1; 284 rcc->buffer_index += av_clip(left, min_rate, max_rate); 285 286 if(rcc->buffer_index > buffer_size){ 287 int stuffing= ceil((rcc->buffer_index - buffer_size)/8); 288 289 if(stuffing < 4 && s->codec_id == CODEC_ID_MPEG4) 290 stuffing=4; 291 rcc->buffer_index -= 8*stuffing; 292 293 if(s->avctx->debug & FF_DEBUG_RC) 294 av_log(s->avctx, AV_LOG_DEBUG, "stuffing %d bytes\n", stuffing); 295 296 return stuffing; 297 } 298 } 299 return 0; 300} 301 302/** 303 * Modify the bitrate curve from pass1 for one frame. 304 */ 305static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num){ 306 RateControlContext *rcc= &s->rc_context; 307 AVCodecContext *a= s->avctx; 308 double q, bits; 309 const int pict_type= rce->new_pict_type; 310 const double mb_num= s->mb_num; 311 int i; 312 313 double const_values[]={ 314 M_PI, 315 M_E, 316 rce->i_tex_bits*rce->qscale, 317 rce->p_tex_bits*rce->qscale, 318 (rce->i_tex_bits + rce->p_tex_bits)*(double)rce->qscale, 319 rce->mv_bits/mb_num, 320 rce->pict_type == AV_PICTURE_TYPE_B ? (rce->f_code + rce->b_code)*0.5 : rce->f_code, 321 rce->i_count/mb_num, 322 rce->mc_mb_var_sum/mb_num, 323 rce->mb_var_sum/mb_num, 324 rce->pict_type == AV_PICTURE_TYPE_I, 325 rce->pict_type == AV_PICTURE_TYPE_P, 326 rce->pict_type == AV_PICTURE_TYPE_B, 327 rcc->qscale_sum[pict_type] / (double)rcc->frame_count[pict_type], 328 a->qcompress, 329/* rcc->last_qscale_for[AV_PICTURE_TYPE_I], 330 rcc->last_qscale_for[AV_PICTURE_TYPE_P], 331 rcc->last_qscale_for[AV_PICTURE_TYPE_B], 332 rcc->next_non_b_qscale,*/ 333 rcc->i_cplx_sum[AV_PICTURE_TYPE_I] / (double)rcc->frame_count[AV_PICTURE_TYPE_I], 334 rcc->i_cplx_sum[AV_PICTURE_TYPE_P] / (double)rcc->frame_count[AV_PICTURE_TYPE_P], 335 rcc->p_cplx_sum[AV_PICTURE_TYPE_P] / (double)rcc->frame_count[AV_PICTURE_TYPE_P], 336 rcc->p_cplx_sum[AV_PICTURE_TYPE_B] / (double)rcc->frame_count[AV_PICTURE_TYPE_B], 337 (rcc->i_cplx_sum[pict_type] + rcc->p_cplx_sum[pict_type]) / (double)rcc->frame_count[pict_type], 338 0 339 }; 340 341 bits = av_expr_eval(rcc->rc_eq_eval, const_values, rce); 342 if (isnan(bits)) { 343 av_log(s->avctx, AV_LOG_ERROR, "Error evaluating rc_eq \"%s\"\n", s->avctx->rc_eq); 344 return -1; 345 } 346 347 rcc->pass1_rc_eq_output_sum+= bits; 348 bits*=rate_factor; 349 if(bits<0.0) bits=0.0; 350 bits+= 1.0; //avoid 1/0 issues 351 352 /* user override */ 353 for(i=0; i<s->avctx->rc_override_count; i++){ 354 RcOverride *rco= s->avctx->rc_override; 355 if(rco[i].start_frame > frame_num) continue; 356 if(rco[i].end_frame < frame_num) continue; 357 358 if(rco[i].qscale) 359 bits= qp2bits(rce, rco[i].qscale); //FIXME move at end to really force it? 360 else 361 bits*= rco[i].quality_factor; 362 } 363 364 q= bits2qp(rce, bits); 365 366 /* I/B difference */ 367 if (pict_type==AV_PICTURE_TYPE_I && s->avctx->i_quant_factor<0.0) 368 q= -q*s->avctx->i_quant_factor + s->avctx->i_quant_offset; 369 else if(pict_type==AV_PICTURE_TYPE_B && s->avctx->b_quant_factor<0.0) 370 q= -q*s->avctx->b_quant_factor + s->avctx->b_quant_offset; 371 if(q<1) q=1; 372 373 return q; 374} 375 376static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q){ 377 RateControlContext *rcc= &s->rc_context; 378 AVCodecContext *a= s->avctx; 379 const int pict_type= rce->new_pict_type; 380 const double last_p_q = rcc->last_qscale_for[AV_PICTURE_TYPE_P]; 381 const double last_non_b_q= rcc->last_qscale_for[rcc->last_non_b_pict_type]; 382 383 if (pict_type==AV_PICTURE_TYPE_I && (a->i_quant_factor>0.0 || rcc->last_non_b_pict_type==AV_PICTURE_TYPE_P)) 384 q= last_p_q *FFABS(a->i_quant_factor) + a->i_quant_offset; 385 else if(pict_type==AV_PICTURE_TYPE_B && a->b_quant_factor>0.0) 386 q= last_non_b_q* a->b_quant_factor + a->b_quant_offset; 387 if(q<1) q=1; 388 389 /* last qscale / qdiff stuff */ 390 if(rcc->last_non_b_pict_type==pict_type || pict_type!=AV_PICTURE_TYPE_I){ 391 double last_q= rcc->last_qscale_for[pict_type]; 392 const int maxdiff= FF_QP2LAMBDA * a->max_qdiff; 393 394 if (q > last_q + maxdiff) q= last_q + maxdiff; 395 else if(q < last_q - maxdiff) q= last_q - maxdiff; 396 } 397 398 rcc->last_qscale_for[pict_type]= q; //Note we cannot do that after blurring 399 400 if(pict_type!=AV_PICTURE_TYPE_B) 401 rcc->last_non_b_pict_type= pict_type; 402 403 return q; 404} 405 406/** 407 * Get the qmin & qmax for pict_type. 408 */ 409static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pict_type){ 410 int qmin= s->avctx->lmin; 411 int qmax= s->avctx->lmax; 412 413 assert(qmin <= qmax); 414 415 if(pict_type==AV_PICTURE_TYPE_B){ 416 qmin= (int)(qmin*FFABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5); 417 qmax= (int)(qmax*FFABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5); 418 }else if(pict_type==AV_PICTURE_TYPE_I){ 419 qmin= (int)(qmin*FFABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5); 420 qmax= (int)(qmax*FFABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5); 421 } 422 423 qmin= av_clip(qmin, 1, FF_LAMBDA_MAX); 424 qmax= av_clip(qmax, 1, FF_LAMBDA_MAX); 425 426 if(qmax<qmin) qmax= qmin; 427 428 *qmin_ret= qmin; 429 *qmax_ret= qmax; 430} 431 432static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q, int frame_num){ 433 RateControlContext *rcc= &s->rc_context; 434 int qmin, qmax; 435 const int pict_type= rce->new_pict_type; 436 const double buffer_size= s->avctx->rc_buffer_size; 437 const double fps= 1/av_q2d(s->avctx->time_base); 438 const double min_rate= s->avctx->rc_min_rate / fps; 439 const double max_rate= s->avctx->rc_max_rate / fps; 440 441 get_qminmax(&qmin, &qmax, s, pict_type); 442 443 /* modulation */ 444 if(s->avctx->rc_qmod_freq && frame_num%s->avctx->rc_qmod_freq==0 && pict_type==AV_PICTURE_TYPE_P) 445 q*= s->avctx->rc_qmod_amp; 446 447//printf("q:%f\n", q); 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//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); 484 if(s->avctx->rc_qsquish==0.0 || qmin==qmax){ 485 if (q<qmin) q=qmin; 486 else if(q>qmax) q=qmax; 487 }else{ 488 double min2= log(qmin); 489 double max2= log(qmax); 490 491 q= log(q); 492 q= (q - min2)/(max2-min2) - 0.5; 493 q*= -4.0; 494 q= 1.0/(1.0 + exp(q)); 495 q= q*(max2-min2) + min2; 496 497 q= exp(q); 498 } 499 500 return q; 501} 502 503//---------------------------------- 504// 1 Pass Code 505 506static double predict_size(Predictor *p, double q, double var) 507{ 508 return p->coeff*var / (q*p->count); 509} 510 511/* 512static double predict_qp(Predictor *p, double size, double var) 513{ 514//printf("coeff:%f, count:%f, var:%f, size:%f//\n", p->coeff, p->count, var, size); 515 return p->coeff*var / (size*p->count); 516} 517*/ 518 519static void update_predictor(Predictor *p, double q, double var, double size) 520{ 521 double new_coeff= size*q / (var + 1); 522 if(var<10) return; 523 524 p->count*= p->decay; 525 p->coeff*= p->decay; 526 p->count++; 527 p->coeff+= new_coeff; 528} 529 530static void adaptive_quantization(MpegEncContext *s, double q){ 531 int i; 532 const float lumi_masking= s->avctx->lumi_masking / (128.0*128.0); 533 const float dark_masking= s->avctx->dark_masking / (128.0*128.0); 534 const float temp_cplx_masking= s->avctx->temporal_cplx_masking; 535 const float spatial_cplx_masking = s->avctx->spatial_cplx_masking; 536 const float p_masking = s->avctx->p_masking; 537 const float border_masking = s->avctx->border_masking; 538 float bits_sum= 0.0; 539 float cplx_sum= 0.0; 540 float cplx_tab[s->mb_num]; 541 float bits_tab[s->mb_num]; 542 const int qmin= s->avctx->mb_lmin; 543 const int qmax= s->avctx->mb_lmax; 544 Picture * const pic= &s->current_picture; 545 const int mb_width = s->mb_width; 546 const int mb_height = s->mb_height; 547 548 for(i=0; i<s->mb_num; i++){ 549 const int mb_xy= s->mb_index2xy[i]; 550 float temp_cplx= sqrt(pic->mc_mb_var[mb_xy]); //FIXME merge in pow() 551 float spat_cplx= sqrt(pic->mb_var[mb_xy]); 552 const int lumi= pic->mb_mean[mb_xy]; 553 float bits, cplx, factor; 554 int mb_x = mb_xy % s->mb_stride; 555 int mb_y = mb_xy / s->mb_stride; 556 int mb_distance; 557 float mb_factor = 0.0; 558#if 0 559 if(spat_cplx < q/3) spat_cplx= q/3; //FIXME finetune 560 if(temp_cplx < q/3) temp_cplx= q/3; //FIXME finetune 561#endif 562 if(spat_cplx < 4) spat_cplx= 4; //FIXME finetune 563 if(temp_cplx < 4) temp_cplx= 4; //FIXME finetune 564 565 if((s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_INTRA)){//FIXME hq mode 566 cplx= spat_cplx; 567 factor= 1.0 + p_masking; 568 }else{ 569 cplx= temp_cplx; 570 factor= pow(temp_cplx, - temp_cplx_masking); 571 } 572 factor*=pow(spat_cplx, - spatial_cplx_masking); 573 574 if(lumi>127) 575 factor*= (1.0 - (lumi-128)*(lumi-128)*lumi_masking); 576 else 577 factor*= (1.0 - (lumi-128)*(lumi-128)*dark_masking); 578 579 if(mb_x < mb_width/5){ 580 mb_distance = mb_width/5 - mb_x; 581 mb_factor = (float)mb_distance / (float)(mb_width/5); 582 }else if(mb_x > 4*mb_width/5){ 583 mb_distance = mb_x - 4*mb_width/5; 584 mb_factor = (float)mb_distance / (float)(mb_width/5); 585 } 586 if(mb_y < mb_height/5){ 587 mb_distance = mb_height/5 - mb_y; 588 mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5)); 589 }else if(mb_y > 4*mb_height/5){ 590 mb_distance = mb_y - 4*mb_height/5; 591 mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5)); 592 } 593 594 factor*= 1.0 - border_masking*mb_factor; 595 596 if(factor<0.00001) factor= 0.00001; 597 598 bits= cplx*factor; 599 cplx_sum+= cplx; 600 bits_sum+= bits; 601 cplx_tab[i]= cplx; 602 bits_tab[i]= bits; 603 } 604 605 /* handle qmin/qmax clipping */ 606 if(s->flags&CODEC_FLAG_NORMALIZE_AQP){ 607 float factor= bits_sum/cplx_sum; 608 for(i=0; i<s->mb_num; i++){ 609 float newq= q*cplx_tab[i]/bits_tab[i]; 610 newq*= factor; 611 612 if (newq > qmax){ 613 bits_sum -= bits_tab[i]; 614 cplx_sum -= cplx_tab[i]*q/qmax; 615 } 616 else if(newq < qmin){ 617 bits_sum -= bits_tab[i]; 618 cplx_sum -= cplx_tab[i]*q/qmin; 619 } 620 } 621 if(bits_sum < 0.001) bits_sum= 0.001; 622 if(cplx_sum < 0.001) cplx_sum= 0.001; 623 } 624 625 for(i=0; i<s->mb_num; i++){ 626 const int mb_xy= s->mb_index2xy[i]; 627 float newq= q*cplx_tab[i]/bits_tab[i]; 628 int intq; 629 630 if(s->flags&CODEC_FLAG_NORMALIZE_AQP){ 631 newq*= bits_sum/cplx_sum; 632 } 633 634 intq= (int)(newq + 0.5); 635 636 if (intq > qmax) intq= qmax; 637 else if(intq < qmin) intq= qmin; 638//if(i%s->mb_width==0) printf("\n"); 639//printf("%2d%3d ", intq, ff_sqrt(s->mc_mb_var[i])); 640 s->lambda_table[mb_xy]= intq; 641 } 642} 643 644void ff_get_2pass_fcode(MpegEncContext *s){ 645 RateControlContext *rcc= &s->rc_context; 646 int picture_number= s->picture_number; 647 RateControlEntry *rce; 648 649 rce= &rcc->entry[picture_number]; 650 s->f_code= rce->f_code; 651 s->b_code= rce->b_code; 652} 653 654//FIXME rd or at least approx for dquant 655 656float ff_rate_estimate_qscale(MpegEncContext *s, int dry_run) 657{ 658 float q; 659 int qmin, qmax; 660 float br_compensation; 661 double diff; 662 double short_term_q; 663 double fps; 664 int picture_number= s->picture_number; 665 int64_t wanted_bits; 666 RateControlContext *rcc= &s->rc_context; 667 AVCodecContext *a= s->avctx; 668 RateControlEntry local_rce, *rce; 669 double bits; 670 double rate_factor; 671 int var; 672 const int pict_type= s->pict_type; 673 Picture * const pic= &s->current_picture; 674 emms_c(); 675 676#if CONFIG_LIBXVID 677 if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID) 678 return ff_xvid_rate_estimate_qscale(s, dry_run); 679#endif 680 681 get_qminmax(&qmin, &qmax, s, pict_type); 682 683 fps= 1/av_q2d(s->avctx->time_base); 684//printf("input_pic_num:%d pic_num:%d frame_rate:%d\n", s->input_picture_number, s->picture_number, s->frame_rate); 685 /* update predictors */ 686 if(picture_number>2 && !dry_run){ 687 const int last_var= s->last_pict_type == AV_PICTURE_TYPE_I ? rcc->last_mb_var_sum : rcc->last_mc_mb_var_sum; 688 update_predictor(&rcc->pred[s->last_pict_type], rcc->last_qscale, sqrt(last_var), s->frame_bits); 689 } 690 691 if(s->flags&CODEC_FLAG_PASS2){ 692 assert(picture_number>=0); 693 assert(picture_number<rcc->num_entries); 694 rce= &rcc->entry[picture_number]; 695 wanted_bits= rce->expected_bits; 696 }else{ 697 Picture *dts_pic; 698 rce= &local_rce; 699 700 //FIXME add a dts field to AVFrame and ensure its set and use it here instead of reordering 701 //but the reordering is simpler for now until h.264 b pyramid must be handeld 702 if(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) 703 dts_pic= s->current_picture_ptr; 704 else 705 dts_pic= s->last_picture_ptr; 706 707//if(dts_pic) 708// av_log(NULL, AV_LOG_ERROR, "%Ld %Ld %Ld %d\n", s->current_picture_ptr->pts, s->user_specified_pts, dts_pic->pts, picture_number); 709 710 if (!dts_pic || dts_pic->f.pts == AV_NOPTS_VALUE) 711 wanted_bits= (uint64_t)(s->bit_rate*(double)picture_number/fps); 712 else 713 wanted_bits = (uint64_t)(s->bit_rate*(double)dts_pic->f.pts / fps); 714 } 715 716 diff= s->total_bits - wanted_bits; 717 br_compensation= (a->bit_rate_tolerance - diff)/a->bit_rate_tolerance; 718 if(br_compensation<=0.0) br_compensation=0.001; 719 720 var= pict_type == AV_PICTURE_TYPE_I ? pic->mb_var_sum : pic->mc_mb_var_sum; 721 722 short_term_q = 0; /* avoid warning */ 723 if(s->flags&CODEC_FLAG_PASS2){ 724 if(pict_type!=AV_PICTURE_TYPE_I) 725 assert(pict_type == rce->new_pict_type); 726 727 q= rce->new_qscale / br_compensation; 728//printf("%f %f %f last:%d var:%d type:%d//\n", q, rce->new_qscale, br_compensation, s->frame_bits, var, pict_type); 729 }else{ 730 rce->pict_type= 731 rce->new_pict_type= pict_type; 732 rce->mc_mb_var_sum= pic->mc_mb_var_sum; 733 rce->mb_var_sum = pic-> mb_var_sum; 734 rce->qscale = FF_QP2LAMBDA * 2; 735 rce->f_code = s->f_code; 736 rce->b_code = s->b_code; 737 rce->misc_bits= 1; 738 739 bits= predict_size(&rcc->pred[pict_type], rce->qscale, sqrt(var)); 740 if(pict_type== AV_PICTURE_TYPE_I){ 741 rce->i_count = s->mb_num; 742 rce->i_tex_bits= bits; 743 rce->p_tex_bits= 0; 744 rce->mv_bits= 0; 745 }else{ 746 rce->i_count = 0; //FIXME we do know this approx 747 rce->i_tex_bits= 0; 748 rce->p_tex_bits= bits*0.9; 749 750 rce->mv_bits= bits*0.1; 751 } 752 rcc->i_cplx_sum [pict_type] += rce->i_tex_bits*rce->qscale; 753 rcc->p_cplx_sum [pict_type] += rce->p_tex_bits*rce->qscale; 754 rcc->mv_bits_sum[pict_type] += rce->mv_bits; 755 rcc->frame_count[pict_type] ++; 756 757 bits= rce->i_tex_bits + rce->p_tex_bits; 758 rate_factor= rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum * br_compensation; 759 760 q= get_qscale(s, rce, rate_factor, picture_number); 761 if (q < 0) 762 return -1; 763 764 assert(q>0.0); 765//printf("%f ", q); 766 q= get_diff_limited_q(s, rce, q); 767//printf("%f ", q); 768 assert(q>0.0); 769 770 if(pict_type==AV_PICTURE_TYPE_P || s->intra_only){ //FIXME type dependent blur like in 2-pass 771 rcc->short_term_qsum*=a->qblur; 772 rcc->short_term_qcount*=a->qblur; 773 774 rcc->short_term_qsum+= q; 775 rcc->short_term_qcount++; 776//printf("%f ", q); 777 q= short_term_q= rcc->short_term_qsum/rcc->short_term_qcount; 778//printf("%f ", q); 779 } 780 assert(q>0.0); 781 782 q= modify_qscale(s, rce, q, picture_number); 783 784 rcc->pass1_wanted_bits+= s->bit_rate/fps; 785 786 assert(q>0.0); 787 } 788 789 if(s->avctx->debug&FF_DEBUG_RC){ 790 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", 791 av_get_picture_type_char(pict_type), qmin, q, qmax, picture_number, (int)wanted_bits/1000, (int)s->total_bits/1000, 792 br_compensation, short_term_q, s->frame_bits, pic->mb_var_sum, pic->mc_mb_var_sum, s->bit_rate/1000, (int)fps 793 ); 794 } 795 796 if (q<qmin) q=qmin; 797 else if(q>qmax) q=qmax; 798 799 if(s->adaptive_quant) 800 adaptive_quantization(s, q); 801 else 802 q= (int)(q + 0.5); 803 804 if(!dry_run){ 805 rcc->last_qscale= q; 806 rcc->last_mc_mb_var_sum= pic->mc_mb_var_sum; 807 rcc->last_mb_var_sum= pic->mb_var_sum; 808 } 809 return q; 810} 811 812//---------------------------------------------- 813// 2-Pass code 814 815static int init_pass2(MpegEncContext *s) 816{ 817 RateControlContext *rcc= &s->rc_context; 818 AVCodecContext *a= s->avctx; 819 int i, toobig; 820 double fps= 1/av_q2d(s->avctx->time_base); 821 double complexity[5]={0,0,0,0,0}; // aproximate bits at quant=1 822 uint64_t const_bits[5]={0,0,0,0,0}; // quantizer independent bits 823 uint64_t all_const_bits; 824 uint64_t all_available_bits= (uint64_t)(s->bit_rate*(double)rcc->num_entries/fps); 825 double rate_factor=0; 826 double step; 827 //int last_i_frame=-10000000; 828 const int filter_size= (int)(a->qblur*4) | 1; 829 double expected_bits; 830 double *qscale, *blurred_qscale, qscale_sum; 831 832 /* find complexity & const_bits & decide the pict_types */ 833 for(i=0; i<rcc->num_entries; i++){ 834 RateControlEntry *rce= &rcc->entry[i]; 835 836 rce->new_pict_type= rce->pict_type; 837 rcc->i_cplx_sum [rce->pict_type] += rce->i_tex_bits*rce->qscale; 838 rcc->p_cplx_sum [rce->pict_type] += rce->p_tex_bits*rce->qscale; 839 rcc->mv_bits_sum[rce->pict_type] += rce->mv_bits; 840 rcc->frame_count[rce->pict_type] ++; 841 842 complexity[rce->new_pict_type]+= (rce->i_tex_bits+ rce->p_tex_bits)*(double)rce->qscale; 843 const_bits[rce->new_pict_type]+= rce->mv_bits + rce->misc_bits; 844 } 845 all_const_bits= const_bits[AV_PICTURE_TYPE_I] + const_bits[AV_PICTURE_TYPE_P] + const_bits[AV_PICTURE_TYPE_B]; 846 847 if(all_available_bits < all_const_bits){ 848 av_log(s->avctx, AV_LOG_ERROR, "requested bitrate is too low\n"); 849 return -1; 850 } 851 852 qscale= av_malloc(sizeof(double)*rcc->num_entries); 853 blurred_qscale= av_malloc(sizeof(double)*rcc->num_entries); 854 toobig = 0; 855 856 for(step=256*256; step>0.0000001; step*=0.5){ 857 expected_bits=0; 858 rate_factor+= step; 859 860 rcc->buffer_index= s->avctx->rc_buffer_size/2; 861 862 /* find qscale */ 863 for(i=0; i<rcc->num_entries; i++){ 864 RateControlEntry *rce= &rcc->entry[i]; 865 qscale[i]= get_qscale(s, &rcc->entry[i], rate_factor, i); 866 rcc->last_qscale_for[rce->pict_type] = qscale[i]; 867 } 868 assert(filter_size%2==1); 869 870 /* fixed I/B QP relative to P mode */ 871 for(i=rcc->num_entries-1; i>=0; i--){ 872 RateControlEntry *rce= &rcc->entry[i]; 873 874 qscale[i]= get_diff_limited_q(s, rce, qscale[i]); 875 } 876 877 /* smooth curve */ 878 for(i=0; i<rcc->num_entries; i++){ 879 RateControlEntry *rce= &rcc->entry[i]; 880 const int pict_type= rce->new_pict_type; 881 int j; 882 double q=0.0, sum=0.0; 883 884 for(j=0; j<filter_size; j++){ 885 int index= i+j-filter_size/2; 886 double d= index-i; 887 double coeff= a->qblur==0 ? 1.0 : exp(-d*d/(a->qblur * a->qblur)); 888 889 if(index < 0 || index >= rcc->num_entries) continue; 890 if(pict_type != rcc->entry[index].new_pict_type) continue; 891 q+= qscale[index] * coeff; 892 sum+= coeff; 893 } 894 blurred_qscale[i]= q/sum; 895 } 896 897 /* find expected bits */ 898 for(i=0; i<rcc->num_entries; i++){ 899 RateControlEntry *rce= &rcc->entry[i]; 900 double bits; 901 rce->new_qscale= modify_qscale(s, rce, blurred_qscale[i], i); 902 bits= qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits; 903//printf("%d %f\n", rce->new_bits, blurred_qscale[i]); 904 bits += 8*ff_vbv_update(s, bits); 905 906 rce->expected_bits= expected_bits; 907 expected_bits += bits; 908 } 909 910 /* 911 av_log(s->avctx, AV_LOG_INFO, 912 "expected_bits: %f all_available_bits: %d rate_factor: %f\n", 913 expected_bits, (int)all_available_bits, rate_factor); 914 */ 915 if(expected_bits > all_available_bits) { 916 rate_factor-= step; 917 ++toobig; 918 } 919 } 920 av_free(qscale); 921 av_free(blurred_qscale); 922 923 /* check bitrate calculations and print info */ 924 qscale_sum = 0.0; 925 for(i=0; i<rcc->num_entries; i++){ 926 /* av_log(s->avctx, AV_LOG_DEBUG, "[lavc rc] entry[%d].new_qscale = %.3f qp = %.3f\n", 927 i, rcc->entry[i].new_qscale, rcc->entry[i].new_qscale / FF_QP2LAMBDA); */ 928 qscale_sum += av_clip(rcc->entry[i].new_qscale / FF_QP2LAMBDA, s->avctx->qmin, s->avctx->qmax); 929 } 930 assert(toobig <= 40); 931 av_log(s->avctx, AV_LOG_DEBUG, 932 "[lavc rc] requested bitrate: %d bps expected bitrate: %d bps\n", 933 s->bit_rate, 934 (int)(expected_bits / ((double)all_available_bits/s->bit_rate))); 935 av_log(s->avctx, AV_LOG_DEBUG, 936 "[lavc rc] estimated target average qp: %.3f\n", 937 (float)qscale_sum / rcc->num_entries); 938 if (toobig == 0) { 939 av_log(s->avctx, AV_LOG_INFO, 940 "[lavc rc] Using all of requested bitrate is not " 941 "necessary for this video with these parameters.\n"); 942 } else if (toobig == 40) { 943 av_log(s->avctx, AV_LOG_ERROR, 944 "[lavc rc] Error: bitrate too low for this video " 945 "with these parameters.\n"); 946 return -1; 947 } else if (fabs(expected_bits/all_available_bits - 1.0) > 0.01) { 948 av_log(s->avctx, AV_LOG_ERROR, 949 "[lavc rc] Error: 2pass curve failed to converge\n"); 950 return -1; 951 } 952 953 return 0; 954} 955