mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-26 03:11:51 +02:00
755 lines
25 KiB
C
755 lines
25 KiB
C
/*
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* Rate control for video encoders
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*
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* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <math.h>
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#include "common.h"
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
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#undef NDEBUG // allways check asserts, the speed effect is far too small to disable them
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#include <assert.h>
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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#ifndef M_E
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#define M_E 2.718281828
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#endif
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static int init_pass2(MpegEncContext *s);
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static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num);
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void ff_write_pass1_stats(MpegEncContext *s){
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sprintf(s->avctx->stats_out, "in:%d out:%d type:%d q:%d itex:%d ptex:%d mv:%d misc:%d fcode:%d bcode:%d mc-var:%d var:%d icount:%d;\n",
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s->picture_number, s->input_picture_number - s->max_b_frames, s->pict_type,
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s->qscale, s->i_tex_bits, s->p_tex_bits, s->mv_bits, s->misc_bits,
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s->f_code, s->b_code, s->mc_mb_var_sum, s->mb_var_sum, s->i_count);
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}
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int ff_rate_control_init(MpegEncContext *s)
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{
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RateControlContext *rcc= &s->rc_context;
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int i;
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emms_c();
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for(i=0; i<5; i++){
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rcc->pred[i].coeff= 7.0;
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rcc->pred[i].count= 1.0;
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rcc->pred[i].decay= 0.4;
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rcc->i_cplx_sum [i]=
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rcc->p_cplx_sum [i]=
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rcc->mv_bits_sum[i]=
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rcc->qscale_sum [i]=
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rcc->frame_count[i]= 1; // 1 is better cuz of 1/0 and such
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rcc->last_qscale_for[i]=5;
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}
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rcc->buffer_index= s->avctx->rc_buffer_size/2;
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rcc->next_non_b_qscale=10;
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rcc->next_p_qscale=10;
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if(s->flags&CODEC_FLAG_PASS2){
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int i;
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char *p;
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/* find number of pics */
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p= s->avctx->stats_in;
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for(i=-1; p; i++){
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p= strchr(p+1, ';');
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}
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i+= s->max_b_frames;
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rcc->entry = (RateControlEntry*)av_mallocz(i*sizeof(RateControlEntry));
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rcc->num_entries= i;
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/* init all to skiped p frames (with b frames we might have a not encoded frame at the end FIXME) */
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for(i=0; i<rcc->num_entries; i++){
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RateControlEntry *rce= &rcc->entry[i];
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rce->pict_type= rce->new_pict_type=P_TYPE;
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rce->qscale= rce->new_qscale=2;
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rce->misc_bits= s->mb_num + 10;
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rce->mb_var_sum= s->mb_num*100;
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}
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/* read stats */
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p= s->avctx->stats_in;
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for(i=0; i<rcc->num_entries - s->max_b_frames; i++){
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RateControlEntry *rce;
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int picture_number;
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int e;
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char *next;
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next= strchr(p, ';');
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if(next){
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(*next)=0; //sscanf in unbelieavle slow on looong strings //FIXME copy / dont write
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next++;
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}
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e= sscanf(p, " in:%d ", &picture_number);
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assert(picture_number >= 0);
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assert(picture_number < rcc->num_entries);
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rce= &rcc->entry[picture_number];
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e+=sscanf(p, " 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",
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&rce->pict_type, &rce->qscale, &rce->i_tex_bits, &rce->p_tex_bits, &rce->mv_bits, &rce->misc_bits,
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&rce->f_code, &rce->b_code, &rce->mc_mb_var_sum, &rce->mb_var_sum, &rce->i_count);
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if(e!=12){
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fprintf(stderr, "statistics are damaged at line %d, parser out=%d\n", i, e);
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return -1;
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}
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p= next;
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}
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if(init_pass2(s) < 0) return -1;
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}
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if(!(s->flags&CODEC_FLAG_PASS2)){
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rcc->short_term_qsum=0.001;
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rcc->short_term_qcount=0.001;
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rcc->pass1_bits =0.001;
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rcc->pass1_wanted_bits=0.001;
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/* init stuff with the user specified complexity */
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if(s->avctx->rc_initial_cplx){
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for(i=0; i<60*30; i++){
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double bits= s->avctx->rc_initial_cplx * (i/10000.0 + 1.0)*s->mb_num;
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RateControlEntry rce;
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double q;
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if (i%((s->gop_size+3)/4)==0) rce.pict_type= I_TYPE;
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else if(i%(s->max_b_frames+1)) rce.pict_type= B_TYPE;
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else rce.pict_type= P_TYPE;
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rce.new_pict_type= rce.pict_type;
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rce.mc_mb_var_sum= bits*s->mb_num/100000;
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rce.mb_var_sum = s->mb_num;
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rce.qscale = 2;
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rce.f_code = 2;
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rce.b_code = 1;
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rce.misc_bits= 1;
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if(s->pict_type== I_TYPE){
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rce.i_count = s->mb_num;
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rce.i_tex_bits= bits;
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rce.p_tex_bits= 0;
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rce.mv_bits= 0;
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}else{
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rce.i_count = 0; //FIXME we do know this approx
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rce.i_tex_bits= 0;
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rce.p_tex_bits= bits*0.9;
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rce.mv_bits= bits*0.1;
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}
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rcc->i_cplx_sum [rce.pict_type] += rce.i_tex_bits*rce.qscale;
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rcc->p_cplx_sum [rce.pict_type] += rce.p_tex_bits*rce.qscale;
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rcc->mv_bits_sum[rce.pict_type] += rce.mv_bits;
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rcc->frame_count[rce.pict_type] ++;
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bits= rce.i_tex_bits + rce.p_tex_bits;
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q= get_qscale(s, &rce, rcc->pass1_wanted_bits/rcc->pass1_bits, i);
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rcc->pass1_wanted_bits+= s->bit_rate/(s->frame_rate / (double)FRAME_RATE_BASE);
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}
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}
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}
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return 0;
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}
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void ff_rate_control_uninit(MpegEncContext *s)
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{
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RateControlContext *rcc= &s->rc_context;
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emms_c();
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av_freep(&rcc->entry);
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}
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static inline double qp2bits(RateControlEntry *rce, double qp){
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if(qp<=0.0){
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fprintf(stderr, "qp<=0.0\n");
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}
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return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ qp;
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}
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static inline double bits2qp(RateControlEntry *rce, double bits){
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if(bits<0.9){
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fprintf(stderr, "bits<0.9\n");
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}
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return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ bits;
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}
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static void update_rc_buffer(MpegEncContext *s, int frame_size){
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RateControlContext *rcc= &s->rc_context;
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const double fps= (double)s->frame_rate / FRAME_RATE_BASE;
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const double buffer_size= s->avctx->rc_buffer_size;
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const double min_rate= s->avctx->rc_min_rate/fps;
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const double max_rate= s->avctx->rc_max_rate/fps;
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if(buffer_size){
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rcc->buffer_index-= frame_size;
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if(rcc->buffer_index < buffer_size/2 /*FIXME /2 */ || min_rate==0){
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rcc->buffer_index+= max_rate;
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if(rcc->buffer_index >= buffer_size)
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rcc->buffer_index= buffer_size-1;
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}else{
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rcc->buffer_index+= min_rate;
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}
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if(rcc->buffer_index < 0)
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fprintf(stderr, "rc buffer underflow\n");
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if(rcc->buffer_index >= s->avctx->rc_buffer_size)
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fprintf(stderr, "rc buffer overflow\n");
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}
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}
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/**
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* modifies the bitrate curve from pass1 for one frame
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*/
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static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num){
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RateControlContext *rcc= &s->rc_context;
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double q, bits;
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const int pict_type= rce->new_pict_type;
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const double mb_num= s->mb_num;
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int i;
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const double last_q= rcc->last_qscale_for[pict_type];
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double const_values[]={
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M_PI,
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M_E,
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rce->i_tex_bits*rce->qscale,
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rce->p_tex_bits*rce->qscale,
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(rce->i_tex_bits + rce->p_tex_bits)*(double)rce->qscale,
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rce->mv_bits/mb_num,
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rce->pict_type == B_TYPE ? (rce->f_code + rce->b_code)*0.5 : rce->f_code,
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rce->i_count/mb_num,
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rce->mc_mb_var_sum/mb_num,
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rce->mb_var_sum/mb_num,
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rce->pict_type == I_TYPE,
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rce->pict_type == P_TYPE,
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rce->pict_type == B_TYPE,
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rcc->qscale_sum[pict_type] / (double)rcc->frame_count[pict_type],
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s->qcompress,
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/* rcc->last_qscale_for[I_TYPE],
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rcc->last_qscale_for[P_TYPE],
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rcc->last_qscale_for[B_TYPE],
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rcc->next_non_b_qscale,*/
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rcc->i_cplx_sum[I_TYPE] / (double)rcc->frame_count[I_TYPE],
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rcc->i_cplx_sum[P_TYPE] / (double)rcc->frame_count[P_TYPE],
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rcc->p_cplx_sum[P_TYPE] / (double)rcc->frame_count[P_TYPE],
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rcc->p_cplx_sum[B_TYPE] / (double)rcc->frame_count[B_TYPE],
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(rcc->i_cplx_sum[pict_type] + rcc->p_cplx_sum[pict_type]) / (double)rcc->frame_count[pict_type],
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0
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};
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char *const_names[]={
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"PI",
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"E",
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"iTex",
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"pTex",
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"tex",
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"mv",
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"fCode",
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"iCount",
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"mcVar",
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"var",
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"isI",
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"isP",
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"isB",
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"avgQP",
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"qComp",
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/* "lastIQP",
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"lastPQP",
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"lastBQP",
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"nextNonBQP",*/
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"avgIITex",
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"avgPITex",
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"avgPPTex",
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"avgBPTex",
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"avgTex",
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NULL
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};
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static double (*func1[])(void *, double)={
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bits2qp,
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qp2bits,
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NULL
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};
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char *func1_names[]={
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"bits2qp",
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"qp2bits",
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NULL
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};
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bits= ff_eval(s->avctx->rc_eq, const_values, const_names, func1, func1_names, NULL, NULL, rce);
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rcc->pass1_bits+= bits;
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bits*=rate_factor;
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if(bits<0.0) bits=0.0;
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bits+= 1.0; //avoid 1/0 issues
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/* user override */
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for(i=0; i<s->avctx->rc_override_count; i++){
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RcOverride *rco= s->avctx->rc_override;
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if(rco[i].start_frame > frame_num) continue;
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if(rco[i].end_frame < frame_num) continue;
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if(rco[i].qscale)
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bits= qp2bits(rce, rco[i].qscale); //FIXME move at end to really force it?
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else
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bits*= rco[i].quality_factor;
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}
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q= bits2qp(rce, bits);
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/* I/B difference */
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if (pict_type==I_TYPE && s->avctx->i_quant_factor<0.0)
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q= -q*s->avctx->i_quant_factor + s->avctx->i_quant_offset;
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else if(pict_type==B_TYPE && s->avctx->b_quant_factor<0.0)
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q= -q*s->avctx->b_quant_factor + s->avctx->b_quant_offset;
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/* last qscale / qdiff stuff */
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if (q > last_q + s->max_qdiff) q= last_q + s->max_qdiff;
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else if(q < last_q - s->max_qdiff) q= last_q - s->max_qdiff;
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rcc->last_qscale_for[pict_type]= q; //Note we cant do that after blurring
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return q;
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}
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/**
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* gets the qmin & qmax for pict_type
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*/
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static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pict_type){
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int qmin= s->qmin;
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int qmax= s->qmax;
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if(pict_type==B_TYPE){
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qmin= (int)(qmin*ABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
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qmax= (int)(qmax*ABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5);
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}else if(pict_type==I_TYPE){
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qmin= (int)(qmin*ABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
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qmax= (int)(qmax*ABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5);
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}
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if(qmin<1) qmin=1;
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if(qmin==1 && s->qmin>1) qmin=2; //avoid qmin=1 unless the user wants qmin=1
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if(qmin<3 && s->max_qcoeff<=128 && pict_type==I_TYPE) qmin=3; //reduce cliping problems
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if(qmax>31) qmax=31;
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if(qmax<=qmin) qmax= qmin= (qmax+qmin+1)>>1;
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*qmin_ret= qmin;
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*qmax_ret= qmax;
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}
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static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q, int frame_num){
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RateControlContext *rcc= &s->rc_context;
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int qmin, qmax;
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double bits;
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const int pict_type= rce->new_pict_type;
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const double buffer_size= s->avctx->rc_buffer_size;
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const double min_rate= s->avctx->rc_min_rate;
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const double max_rate= s->avctx->rc_max_rate;
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get_qminmax(&qmin, &qmax, s, pict_type);
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/* modulation */
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if(s->avctx->rc_qmod_freq && frame_num%s->avctx->rc_qmod_freq==0 && pict_type==P_TYPE)
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q*= s->avctx->rc_qmod_amp;
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bits= qp2bits(rce, q);
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/* buffer overflow/underflow protection */
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if(buffer_size){
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double expected_size= rcc->buffer_index - bits;
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if(min_rate){
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double d= 2*(buffer_size - (expected_size + min_rate))/buffer_size;
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if(d>1.0) d=1.0;
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q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
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}
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if(max_rate){
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double d= 2*expected_size/buffer_size;
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if(d>1.0) d=1.0;
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q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
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}
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}
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if(s->avctx->rc_qsquish==0.0 || qmin==qmax){
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if (q<qmin) q=qmin;
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else if(q>qmax) q=qmax;
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}else{
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double min2= log(qmin);
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double max2= log(qmax);
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q= log(q);
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q= (q - min2)/(max2-min2) - 0.5;
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q*= -4.0;
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q= 1.0/(1.0 + exp(q));
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q= q*(max2-min2) + min2;
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q= exp(q);
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}
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return q;
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}
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//----------------------------------
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// 1 Pass Code
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static double predict_size(Predictor *p, double q, double var)
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{
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return p->coeff*var / (q*p->count);
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}
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static double predict_qp(Predictor *p, double size, double var)
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{
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//printf("coeff:%f, count:%f, var:%f, size:%f//\n", p->coeff, p->count, var, size);
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return p->coeff*var / (size*p->count);
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}
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static void update_predictor(Predictor *p, double q, double var, double size)
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{
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double new_coeff= size*q / (var + 1);
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if(var<10) return;
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p->count*= p->decay;
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p->coeff*= p->decay;
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p->count++;
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p->coeff+= new_coeff;
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}
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int ff_rate_estimate_qscale(MpegEncContext *s)
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{
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float q;
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int qscale, qmin, qmax;
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float br_compensation;
|
|
double diff;
|
|
double short_term_q;
|
|
double fps;
|
|
int picture_number= s->picture_number;
|
|
int64_t wanted_bits;
|
|
RateControlContext *rcc= &s->rc_context;
|
|
RateControlEntry local_rce, *rce;
|
|
double bits;
|
|
double rate_factor;
|
|
int var;
|
|
const int pict_type= s->pict_type;
|
|
emms_c();
|
|
|
|
get_qminmax(&qmin, &qmax, s, pict_type);
|
|
|
|
fps= (double)s->frame_rate / FRAME_RATE_BASE;
|
|
//printf("input_picture_number:%d picture_number:%d\n", s->input_picture_number, s->picture_number);
|
|
/* update predictors */
|
|
if(picture_number>2){
|
|
const int last_var= s->last_pict_type == I_TYPE ? rcc->last_mb_var_sum : rcc->last_mc_mb_var_sum;
|
|
update_predictor(&rcc->pred[s->last_pict_type], rcc->last_qscale, sqrt(last_var), s->frame_bits);
|
|
}
|
|
|
|
if(s->flags&CODEC_FLAG_PASS2){
|
|
assert(picture_number>=0);
|
|
assert(picture_number<rcc->num_entries);
|
|
rce= &rcc->entry[picture_number];
|
|
wanted_bits= rce->expected_bits;
|
|
}else{
|
|
rce= &local_rce;
|
|
wanted_bits= (uint64_t)(s->bit_rate*(double)picture_number/fps);
|
|
}
|
|
|
|
diff= s->total_bits - wanted_bits;
|
|
br_compensation= (s->bit_rate_tolerance - diff)/s->bit_rate_tolerance;
|
|
if(br_compensation<=0.0) br_compensation=0.001;
|
|
|
|
var= pict_type == I_TYPE ? s->mb_var_sum : s->mc_mb_var_sum;
|
|
|
|
if(s->flags&CODEC_FLAG_PASS2){
|
|
if(pict_type!=I_TYPE)
|
|
assert(pict_type == rce->new_pict_type);
|
|
|
|
q= rce->new_qscale / br_compensation;
|
|
//printf("%f %f %f last:%d var:%d type:%d//\n", q, rce->new_qscale, br_compensation, s->frame_bits, var, pict_type);
|
|
}else{
|
|
rce->pict_type=
|
|
rce->new_pict_type= pict_type;
|
|
rce->mc_mb_var_sum= s->mc_mb_var_sum;
|
|
rce->mb_var_sum = s-> mb_var_sum;
|
|
rce->qscale = 2;
|
|
rce->f_code = s->f_code;
|
|
rce->b_code = s->b_code;
|
|
rce->misc_bits= 1;
|
|
|
|
if(picture_number>0)
|
|
update_rc_buffer(s, s->frame_bits);
|
|
|
|
bits= predict_size(&rcc->pred[pict_type], rce->qscale, sqrt(var));
|
|
if(pict_type== I_TYPE){
|
|
rce->i_count = s->mb_num;
|
|
rce->i_tex_bits= bits;
|
|
rce->p_tex_bits= 0;
|
|
rce->mv_bits= 0;
|
|
}else{
|
|
rce->i_count = 0; //FIXME we do know this approx
|
|
rce->i_tex_bits= 0;
|
|
rce->p_tex_bits= bits*0.9;
|
|
|
|
rce->mv_bits= bits*0.1;
|
|
}
|
|
rcc->i_cplx_sum [pict_type] += rce->i_tex_bits*rce->qscale;
|
|
rcc->p_cplx_sum [pict_type] += rce->p_tex_bits*rce->qscale;
|
|
rcc->mv_bits_sum[pict_type] += rce->mv_bits;
|
|
rcc->frame_count[pict_type] ++;
|
|
|
|
bits= rce->i_tex_bits + rce->p_tex_bits;
|
|
rate_factor= rcc->pass1_wanted_bits/rcc->pass1_bits * br_compensation;
|
|
|
|
q= get_qscale(s, rce, rate_factor, picture_number);
|
|
|
|
assert(q>0.0);
|
|
//printf("%f ", q);
|
|
if (pict_type==I_TYPE && s->avctx->i_quant_factor>0.0)
|
|
q= rcc->next_p_qscale*s->avctx->i_quant_factor + s->avctx->i_quant_offset;
|
|
else if(pict_type==B_TYPE && s->avctx->b_quant_factor>0.0)
|
|
q= rcc->next_non_b_qscale*s->avctx->b_quant_factor + s->avctx->b_quant_offset;
|
|
//printf("%f ", q);
|
|
assert(q>0.0);
|
|
|
|
if(pict_type==P_TYPE || s->intra_only){ //FIXME type dependant blur like in 2-pass
|
|
rcc->short_term_qsum*=s->qblur;
|
|
rcc->short_term_qcount*=s->qblur;
|
|
|
|
rcc->short_term_qsum+= q;
|
|
rcc->short_term_qcount++;
|
|
//printf("%f ", q);
|
|
q= short_term_q= rcc->short_term_qsum/rcc->short_term_qcount;
|
|
//printf("%f ", q);
|
|
}
|
|
q= modify_qscale(s, rce, q, picture_number);
|
|
|
|
rcc->pass1_wanted_bits+= s->bit_rate/fps;
|
|
|
|
assert(q>0.0);
|
|
|
|
if(pict_type != B_TYPE) rcc->next_non_b_qscale= q;
|
|
if(pict_type == P_TYPE) rcc->next_p_qscale= q;
|
|
}
|
|
//printf("qmin:%d, qmax:%d, q:%f\n", qmin, qmax, q);
|
|
|
|
|
|
if (q<qmin) q=qmin;
|
|
else if(q>qmax) q=qmax;
|
|
|
|
// printf("%f %d %d %d\n", q, picture_number, (int)wanted_bits, (int)s->total_bits);
|
|
|
|
|
|
//printf("%f %f %f\n", q, br_compensation, short_term_q);
|
|
qscale= (int)(q + 0.5);
|
|
//printf("%d ", qscale);
|
|
|
|
//printf("q:%d diff:%d comp:%f rate_q:%d st_q:%f fvar:%d last_size:%d\n", qscale, (int)diff, br_compensation,
|
|
// rate_q, short_term_q, s->mc_mb_var, s->frame_bits);
|
|
//printf("%d %d\n", s->bit_rate, (int)fps);
|
|
|
|
rcc->last_qscale= qscale;
|
|
rcc->last_mc_mb_var_sum= s->mc_mb_var_sum;
|
|
rcc->last_mb_var_sum= s->mb_var_sum;
|
|
return qscale;
|
|
}
|
|
|
|
//----------------------------------------------
|
|
// 2-Pass code
|
|
|
|
static int init_pass2(MpegEncContext *s)
|
|
{
|
|
RateControlContext *rcc= &s->rc_context;
|
|
int i;
|
|
double fps= (double)s->frame_rate / FRAME_RATE_BASE;
|
|
double complexity[5]={0,0,0,0,0}; // aproximate bits at quant=1
|
|
double avg_quantizer[5];
|
|
uint64_t const_bits[5]={0,0,0,0,0}; // quantizer idependant bits
|
|
uint64_t available_bits[5];
|
|
uint64_t all_const_bits;
|
|
uint64_t all_available_bits= (uint64_t)(s->bit_rate*(double)rcc->num_entries/fps);
|
|
double rate_factor=0;
|
|
double step;
|
|
int last_i_frame=-10000000;
|
|
const int filter_size= (int)(s->qblur*4) | 1;
|
|
double expected_bits;
|
|
double *qscale, *blured_qscale;
|
|
|
|
/* find complexity & const_bits & decide the pict_types */
|
|
for(i=0; i<rcc->num_entries; i++){
|
|
RateControlEntry *rce= &rcc->entry[i];
|
|
|
|
if(s->b_frame_strategy==0 || s->max_b_frames==0){
|
|
rce->new_pict_type= rce->pict_type;
|
|
}else{
|
|
int j;
|
|
int next_non_b_type=P_TYPE;
|
|
|
|
switch(rce->pict_type){
|
|
case I_TYPE:
|
|
if(i-last_i_frame>s->gop_size/2){ //FIXME this is not optimal
|
|
rce->new_pict_type= I_TYPE;
|
|
last_i_frame= i;
|
|
}else{
|
|
rce->new_pict_type= P_TYPE; // will be caught by the scene detection anyway
|
|
}
|
|
break;
|
|
case P_TYPE:
|
|
rce->new_pict_type= P_TYPE;
|
|
break;
|
|
case B_TYPE:
|
|
for(j=i+1; j<i+s->max_b_frames+2 && j<rcc->num_entries; j++){
|
|
if(rcc->entry[j].pict_type != B_TYPE){
|
|
next_non_b_type= rcc->entry[j].pict_type;
|
|
break;
|
|
}
|
|
}
|
|
if(next_non_b_type==I_TYPE)
|
|
rce->new_pict_type= P_TYPE;
|
|
else
|
|
rce->new_pict_type= B_TYPE;
|
|
break;
|
|
}
|
|
}
|
|
rcc->i_cplx_sum [rce->pict_type] += rce->i_tex_bits*rce->qscale;
|
|
rcc->p_cplx_sum [rce->pict_type] += rce->p_tex_bits*rce->qscale;
|
|
rcc->mv_bits_sum[rce->pict_type] += rce->mv_bits;
|
|
rcc->frame_count[rce->pict_type] ++;
|
|
|
|
complexity[rce->new_pict_type]+= (rce->i_tex_bits+ rce->p_tex_bits)*(double)rce->qscale;
|
|
const_bits[rce->new_pict_type]+= rce->mv_bits + rce->misc_bits;
|
|
}
|
|
all_const_bits= const_bits[I_TYPE] + const_bits[P_TYPE] + const_bits[B_TYPE];
|
|
|
|
if(all_available_bits < all_const_bits){
|
|
fprintf(stderr, "requested bitrate is to low\n");
|
|
return -1;
|
|
}
|
|
|
|
/* find average quantizers */
|
|
avg_quantizer[P_TYPE]=0;
|
|
for(step=256*256; step>0.0000001; step*=0.5){
|
|
double expected_bits=0;
|
|
avg_quantizer[P_TYPE]+= step;
|
|
|
|
avg_quantizer[I_TYPE]= avg_quantizer[P_TYPE]*ABS(s->avctx->i_quant_factor) + s->avctx->i_quant_offset;
|
|
avg_quantizer[B_TYPE]= avg_quantizer[P_TYPE]*ABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset;
|
|
|
|
expected_bits=
|
|
+ all_const_bits
|
|
+ complexity[I_TYPE]/avg_quantizer[I_TYPE]
|
|
+ complexity[P_TYPE]/avg_quantizer[P_TYPE]
|
|
+ complexity[B_TYPE]/avg_quantizer[B_TYPE];
|
|
|
|
if(expected_bits < all_available_bits) avg_quantizer[P_TYPE]-= step;
|
|
//printf("%f %lld %f\n", expected_bits, all_available_bits, avg_quantizer[P_TYPE]);
|
|
}
|
|
//printf("qp_i:%f, qp_p:%f, qp_b:%f\n", avg_quantizer[I_TYPE],avg_quantizer[P_TYPE],avg_quantizer[B_TYPE]);
|
|
|
|
for(i=0; i<5; i++){
|
|
available_bits[i]= const_bits[i] + complexity[i]/avg_quantizer[i];
|
|
}
|
|
//printf("%lld %lld %lld %lld\n", available_bits[I_TYPE], available_bits[P_TYPE], available_bits[B_TYPE], all_available_bits);
|
|
|
|
qscale= malloc(sizeof(double)*rcc->num_entries);
|
|
blured_qscale= malloc(sizeof(double)*rcc->num_entries);
|
|
|
|
for(step=256*256; step>0.0000001; step*=0.5){
|
|
expected_bits=0;
|
|
rate_factor+= step;
|
|
|
|
rcc->buffer_index= s->avctx->rc_buffer_size/2;
|
|
|
|
/* find qscale */
|
|
for(i=0; i<rcc->num_entries; i++){
|
|
qscale[i]= get_qscale(s, &rcc->entry[i], rate_factor, i);
|
|
}
|
|
assert(filter_size%2==1);
|
|
|
|
/* fixed I/B QP relative to P mode */
|
|
rcc->next_non_b_qscale= 10;
|
|
rcc->next_p_qscale= 10;
|
|
for(i=rcc->num_entries-1; i>=0; i--){
|
|
RateControlEntry *rce= &rcc->entry[i];
|
|
const int pict_type= rce->new_pict_type;
|
|
|
|
if (pict_type==I_TYPE && s->avctx->i_quant_factor>0.0)
|
|
qscale[i]= rcc->next_p_qscale*s->avctx->i_quant_factor + s->avctx->i_quant_offset;
|
|
else if(pict_type==B_TYPE && s->avctx->b_quant_factor>0.0)
|
|
qscale[i]= rcc->next_non_b_qscale*s->avctx->b_quant_factor + s->avctx->b_quant_offset;
|
|
|
|
if(pict_type!=B_TYPE)
|
|
rcc->next_non_b_qscale= qscale[i];
|
|
if(pict_type==P_TYPE)
|
|
rcc->next_p_qscale= qscale[i];
|
|
}
|
|
|
|
/* smooth curve */
|
|
for(i=0; i<rcc->num_entries; i++){
|
|
RateControlEntry *rce= &rcc->entry[i];
|
|
const int pict_type= rce->new_pict_type;
|
|
int j;
|
|
double q=0.0, sum=0.0;
|
|
|
|
for(j=0; j<filter_size; j++){
|
|
int index= i+j-filter_size/2;
|
|
double d= index-i;
|
|
double coeff= s->qblur==0 ? 1.0 : exp(-d*d/(s->qblur * s->qblur));
|
|
|
|
if(index < 0 || index >= rcc->num_entries) continue;
|
|
if(pict_type != rcc->entry[index].new_pict_type) continue;
|
|
q+= qscale[index] * coeff;
|
|
sum+= coeff;
|
|
}
|
|
blured_qscale[i]= q/sum;
|
|
}
|
|
|
|
/* find expected bits */
|
|
for(i=0; i<rcc->num_entries; i++){
|
|
RateControlEntry *rce= &rcc->entry[i];
|
|
double bits;
|
|
rce->new_qscale= modify_qscale(s, rce, blured_qscale[i], i);
|
|
bits= qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits;
|
|
//printf("%d %f\n", rce->new_bits, blured_qscale[i]);
|
|
update_rc_buffer(s, bits);
|
|
|
|
rce->expected_bits= expected_bits;
|
|
expected_bits += bits;
|
|
}
|
|
|
|
// printf("%f %d %f\n", expected_bits, (int)all_available_bits, rate_factor);
|
|
if(expected_bits > all_available_bits) rate_factor-= step;
|
|
}
|
|
free(qscale);
|
|
free(blured_qscale);
|
|
|
|
if(abs(expected_bits/all_available_bits - 1.0) > 0.01 ){
|
|
fprintf(stderr, "Error: 2pass curve failed to converge\n");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|