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* Rate control for video encoders
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* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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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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* 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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* 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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* Rate control for video encoders.
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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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#define M_E 2.718281828
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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->current_picture_ptr->display_picture_number, s->current_picture_ptr->coded_picture_number, s->pict_type,
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s->current_picture.quality, 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->current_picture.mc_mb_var_sum, s->current_picture.mb_var_sum, s->i_count);
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int ff_rate_control_init(MpegEncContext *s)
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RateControlContext *rcc= &s->rc_context;
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rcc->pred[i].coeff= FF_QP2LAMBDA * 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->frame_count[i]= 1; // 1 is better cuz of 1/0 and such
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rcc->last_qscale_for[i]=FF_QP2LAMBDA * 5;
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rcc->buffer_index= s->avctx->rc_initial_buffer_occupancy;
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if(s->flags&CODEC_FLAG_PASS2){
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/* find number of pics */
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p= s->avctx->stats_in;
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rcc->entry = (RateControlEntry*)av_mallocz(i*sizeof(RateControlEntry));
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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=FF_QP2LAMBDA * 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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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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(*next)=0; //sscanf in unbelieavle slow on looong strings //FIXME copy / dont write
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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:%f 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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av_log(s->avctx, AV_LOG_ERROR, "statistics are damaged at line %d, parser out=%d\n", i, e);
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if(init_pass2(s) < 0) return -1;
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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_rc_eq_output_sum= 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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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 = FF_QP2LAMBDA * 2;
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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.i_count = 0; //FIXME we do know this approx
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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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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_rc_eq_output_sum, i);
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rcc->pass1_wanted_bits+= s->bit_rate/(s->avctx->frame_rate / (double)s->avctx->frame_rate_base);
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void ff_rate_control_uninit(MpegEncContext *s)
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RateControlContext *rcc= &s->rc_context;
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av_freep(&rcc->entry);
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static inline double qp2bits(RateControlEntry *rce, double qp){
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av_log(NULL, AV_LOG_ERROR, "qp<=0.0\n");
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return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ qp;
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static inline double bits2qp(RateControlEntry *rce, double bits){
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av_log(NULL, AV_LOG_ERROR, "bits<0.9\n");
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return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ bits;
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int ff_vbv_update(MpegEncContext *s, int frame_size){
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RateControlContext *rcc= &s->rc_context;
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const double fps= (double)s->avctx->frame_rate / (double)s->avctx->frame_rate_base;
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const int 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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//printf("%d %f %d %f %f\n", buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate);
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rcc->buffer_index-= frame_size;
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if(rcc->buffer_index < 0){
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av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n");
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rcc->buffer_index= 0;
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left= buffer_size - rcc->buffer_index - 1;
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rcc->buffer_index += clip(left, min_rate, max_rate);
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if(rcc->buffer_index > buffer_size){
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int stuffing= ceil((rcc->buffer_index - buffer_size)/8);
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if(stuffing < 4 && s->codec_id == CODEC_ID_MPEG4)
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rcc->buffer_index -= 8*stuffing;
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if(s->avctx->debug & FF_DEBUG_RC)
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av_log(s->avctx, AV_LOG_DEBUG, "stuffing %d bytes\n", stuffing);
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* modifies the bitrate curve from pass1 for one frame
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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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AVCodecContext *a= s->avctx;
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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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double const_values[]={
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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->pict_type == B_TYPE ? (rce->f_code + rce->b_code)*0.5 : rce->f_code,
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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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/* 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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static const char *const_names[]={
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static double (*func1[])(void *, double)={
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static const char *func1_names[]={
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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_rc_eq_output_sum+= bits;
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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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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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bits= qp2bits(rce, rco[i].qscale); //FIXME move at end to really force it?
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bits*= rco[i].quality_factor;
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q= bits2qp(rce, bits);
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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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static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q){
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RateControlContext *rcc= &s->rc_context;
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AVCodecContext *a= s->avctx;
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const int pict_type= rce->new_pict_type;
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const double last_p_q = rcc->last_qscale_for[P_TYPE];
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const double last_non_b_q= rcc->last_qscale_for[rcc->last_non_b_pict_type];
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if (pict_type==I_TYPE && (a->i_quant_factor>0.0 || rcc->last_non_b_pict_type==P_TYPE))
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q= last_p_q *ABS(a->i_quant_factor) + a->i_quant_offset;
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else if(pict_type==B_TYPE && a->b_quant_factor>0.0)
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q= last_non_b_q* a->b_quant_factor + a->b_quant_offset;
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/* last qscale / qdiff stuff */
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if(rcc->last_non_b_pict_type==pict_type || pict_type!=I_TYPE){
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double last_q= rcc->last_qscale_for[pict_type];
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const int maxdiff= FF_QP2LAMBDA * a->max_qdiff;
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if (q > last_q + maxdiff) q= last_q + maxdiff;
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else if(q < last_q - maxdiff) q= last_q - maxdiff;
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rcc->last_qscale_for[pict_type]= q; //Note we cant do that after blurring
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if(pict_type!=B_TYPE)
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rcc->last_non_b_pict_type= pict_type;
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* gets the qmin & qmax for pict_type
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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->avctx->lmin;
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int qmax= s->avctx->lmax;
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assert(qmin <= 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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qmin= clip(qmin, 1, FF_LAMBDA_MAX);
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qmax= clip(qmax, 1, FF_LAMBDA_MAX);
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if(qmax<qmin) qmax= qmin;
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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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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 fps= (double)s->avctx->frame_rate / (double)s->avctx->frame_rate_base;
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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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get_qminmax(&qmin, &qmax, s, pict_type);
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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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//printf("q:%f\n", q);
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/* buffer overflow/underflow protection */
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double expected_size= rcc->buffer_index;
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double d= 2*(buffer_size - expected_size)/buffer_size;
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else if(d<0.0001) d=0.0001;
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q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
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q_limit= bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index)*3, 1));
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if(s->avctx->debug&FF_DEBUG_RC){
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av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
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double d= 2*expected_size/buffer_size;
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else if(d<0.0001) d=0.0001;
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q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity);
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q_limit= bits2qp(rce, FFMAX(rcc->buffer_index/3, 1));
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if(s->avctx->debug&FF_DEBUG_RC){
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av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit);
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//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);
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if(s->avctx->rc_qsquish==0.0 || qmin==qmax){
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else if(q>qmax) q=qmax;
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double min2= log(qmin);
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double max2= log(qmax);
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q= (q - min2)/(max2-min2) - 0.5;
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q= 1.0/(1.0 + exp(q));
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q= q*(max2-min2) + min2;
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//----------------------------------
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static double predict_size(Predictor *p, double q, double var)
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return p->coeff*var / (q*p->count);
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static double predict_qp(Predictor *p, double size, double var)
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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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static void update_predictor(Predictor *p, double q, double var, double size)
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double new_coeff= size*q / (var + 1);
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p->coeff+= new_coeff;
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static void adaptive_quantization(MpegEncContext *s, double q){
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const float lumi_masking= s->avctx->lumi_masking / (128.0*128.0);
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const float dark_masking= s->avctx->dark_masking / (128.0*128.0);
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const float temp_cplx_masking= s->avctx->temporal_cplx_masking;
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const float spatial_cplx_masking = s->avctx->spatial_cplx_masking;
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const float p_masking = s->avctx->p_masking;
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float cplx_tab[s->mb_num];
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float bits_tab[s->mb_num];
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const int qmin= s->avctx->lmin;
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const int qmax= s->avctx->lmax;
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Picture * const pic= &s->current_picture;
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for(i=0; i<s->mb_num; i++){
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const int mb_xy= s->mb_index2xy[i];
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float temp_cplx= sqrt(pic->mc_mb_var[mb_xy]); //FIXME merge in pow()
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float spat_cplx= sqrt(pic->mb_var[mb_xy]);
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const int lumi= pic->mb_mean[mb_xy];
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float bits, cplx, factor;
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if(spat_cplx < q/3) spat_cplx= q/3; //FIXME finetune
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if(temp_cplx < q/3) temp_cplx= q/3; //FIXME finetune
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if(spat_cplx < 4) spat_cplx= 4; //FIXME finetune
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if(temp_cplx < 4) temp_cplx= 4; //FIXME finetune
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if((s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_INTRA)){//FIXME hq mode
525
factor= 1.0 + p_masking;
528
factor= pow(temp_cplx, - temp_cplx_masking);
530
factor*=pow(spat_cplx, - spatial_cplx_masking);
533
factor*= (1.0 - (lumi-128)*(lumi-128)*lumi_masking);
535
factor*= (1.0 - (lumi-128)*(lumi-128)*dark_masking);
537
if(factor<0.00001) factor= 0.00001;
546
/* handle qmin/qmax cliping */
547
if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
548
float factor= bits_sum/cplx_sum;
549
for(i=0; i<s->mb_num; i++){
550
float newq= q*cplx_tab[i]/bits_tab[i];
554
bits_sum -= bits_tab[i];
555
cplx_sum -= cplx_tab[i]*q/qmax;
557
else if(newq < qmin){
558
bits_sum -= bits_tab[i];
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cplx_sum -= cplx_tab[i]*q/qmin;
562
if(bits_sum < 0.001) bits_sum= 0.001;
563
if(cplx_sum < 0.001) cplx_sum= 0.001;
566
for(i=0; i<s->mb_num; i++){
567
const int mb_xy= s->mb_index2xy[i];
568
float newq= q*cplx_tab[i]/bits_tab[i];
571
if(s->flags&CODEC_FLAG_NORMALIZE_AQP){
572
newq*= bits_sum/cplx_sum;
575
intq= (int)(newq + 0.5);
577
if (intq > qmax) intq= qmax;
578
else if(intq < qmin) intq= qmin;
579
//if(i%s->mb_width==0) printf("\n");
580
//printf("%2d%3d ", intq, ff_sqrt(s->mc_mb_var[i]));
581
s->lambda_table[mb_xy]= intq;
584
//FIXME rd or at least approx for dquant
586
float ff_rate_estimate_qscale(MpegEncContext *s)
590
float br_compensation;
594
int picture_number= s->picture_number;
596
RateControlContext *rcc= &s->rc_context;
597
AVCodecContext *a= s->avctx;
598
RateControlEntry local_rce, *rce;
602
const int pict_type= s->pict_type;
603
Picture * const pic= &s->current_picture;
606
get_qminmax(&qmin, &qmax, s, pict_type);
608
fps= (double)s->avctx->frame_rate / (double)s->avctx->frame_rate_base;
609
//printf("input_pic_num:%d pic_num:%d frame_rate:%d\n", s->input_picture_number, s->picture_number, s->frame_rate);
610
/* update predictors */
611
if(picture_number>2){
612
const int last_var= s->last_pict_type == I_TYPE ? rcc->last_mb_var_sum : rcc->last_mc_mb_var_sum;
613
update_predictor(&rcc->pred[s->last_pict_type], rcc->last_qscale, sqrt(last_var), s->frame_bits);
616
if(s->flags&CODEC_FLAG_PASS2){
617
assert(picture_number>=0);
618
assert(picture_number<rcc->num_entries);
619
rce= &rcc->entry[picture_number];
620
wanted_bits= rce->expected_bits;
623
wanted_bits= (uint64_t)(s->bit_rate*(double)picture_number/fps);
626
diff= s->total_bits - wanted_bits;
627
br_compensation= (a->bit_rate_tolerance - diff)/a->bit_rate_tolerance;
628
if(br_compensation<=0.0) br_compensation=0.001;
630
var= pict_type == I_TYPE ? pic->mb_var_sum : pic->mc_mb_var_sum;
632
short_term_q = 0; /* avoid warning */
633
if(s->flags&CODEC_FLAG_PASS2){
634
if(pict_type!=I_TYPE)
635
assert(pict_type == rce->new_pict_type);
637
q= rce->new_qscale / br_compensation;
638
//printf("%f %f %f last:%d var:%d type:%d//\n", q, rce->new_qscale, br_compensation, s->frame_bits, var, pict_type);
641
rce->new_pict_type= pict_type;
642
rce->mc_mb_var_sum= pic->mc_mb_var_sum;
643
rce->mb_var_sum = pic-> mb_var_sum;
644
rce->qscale = FF_QP2LAMBDA * 2;
645
rce->f_code = s->f_code;
646
rce->b_code = s->b_code;
649
bits= predict_size(&rcc->pred[pict_type], rce->qscale, sqrt(var));
650
if(pict_type== I_TYPE){
651
rce->i_count = s->mb_num;
652
rce->i_tex_bits= bits;
656
rce->i_count = 0; //FIXME we do know this approx
658
rce->p_tex_bits= bits*0.9;
660
rce->mv_bits= bits*0.1;
662
rcc->i_cplx_sum [pict_type] += rce->i_tex_bits*rce->qscale;
663
rcc->p_cplx_sum [pict_type] += rce->p_tex_bits*rce->qscale;
664
rcc->mv_bits_sum[pict_type] += rce->mv_bits;
665
rcc->frame_count[pict_type] ++;
667
bits= rce->i_tex_bits + rce->p_tex_bits;
668
rate_factor= rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum * br_compensation;
670
q= get_qscale(s, rce, rate_factor, picture_number);
674
q= get_diff_limited_q(s, rce, q);
678
if(pict_type==P_TYPE || s->intra_only){ //FIXME type dependant blur like in 2-pass
679
rcc->short_term_qsum*=a->qblur;
680
rcc->short_term_qcount*=a->qblur;
682
rcc->short_term_qsum+= q;
683
rcc->short_term_qcount++;
685
q= short_term_q= rcc->short_term_qsum/rcc->short_term_qcount;
690
q= modify_qscale(s, rce, q, picture_number);
692
rcc->pass1_wanted_bits+= s->bit_rate/fps;
697
if(s->avctx->debug&FF_DEBUG_RC){
698
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",
699
av_get_pict_type_char(pict_type), qmin, q, qmax, picture_number, (int)wanted_bits/1000, (int)s->total_bits/1000,
700
br_compensation, short_term_q, s->frame_bits, pic->mb_var_sum, pic->mc_mb_var_sum, s->bit_rate/1000, (int)fps
705
else if(q>qmax) q=qmax;
707
if(s->adaptive_quant)
708
adaptive_quantization(s, q);
713
rcc->last_mc_mb_var_sum= pic->mc_mb_var_sum;
714
rcc->last_mb_var_sum= pic->mb_var_sum;
717
static int mvsum=0, texsum=0;
719
texsum += s->i_tex_bits + s->p_tex_bits;
720
printf("%d %d//\n\n", mvsum, texsum);
726
//----------------------------------------------
729
static int init_pass2(MpegEncContext *s)
731
RateControlContext *rcc= &s->rc_context;
732
AVCodecContext *a= s->avctx;
734
double fps= (double)s->avctx->frame_rate / (double)s->avctx->frame_rate_base;
735
double complexity[5]={0,0,0,0,0}; // aproximate bits at quant=1
736
double avg_quantizer[5];
737
uint64_t const_bits[5]={0,0,0,0,0}; // quantizer idependant bits
738
uint64_t available_bits[5];
739
uint64_t all_const_bits;
740
uint64_t all_available_bits= (uint64_t)(s->bit_rate*(double)rcc->num_entries/fps);
741
double rate_factor=0;
743
//int last_i_frame=-10000000;
744
const int filter_size= (int)(a->qblur*4) | 1;
745
double expected_bits;
746
double *qscale, *blured_qscale;
748
/* find complexity & const_bits & decide the pict_types */
749
for(i=0; i<rcc->num_entries; i++){
750
RateControlEntry *rce= &rcc->entry[i];
752
rce->new_pict_type= rce->pict_type;
753
rcc->i_cplx_sum [rce->pict_type] += rce->i_tex_bits*rce->qscale;
754
rcc->p_cplx_sum [rce->pict_type] += rce->p_tex_bits*rce->qscale;
755
rcc->mv_bits_sum[rce->pict_type] += rce->mv_bits;
756
rcc->frame_count[rce->pict_type] ++;
758
complexity[rce->new_pict_type]+= (rce->i_tex_bits+ rce->p_tex_bits)*(double)rce->qscale;
759
const_bits[rce->new_pict_type]+= rce->mv_bits + rce->misc_bits;
761
all_const_bits= const_bits[I_TYPE] + const_bits[P_TYPE] + const_bits[B_TYPE];
763
if(all_available_bits < all_const_bits){
764
av_log(s->avctx, AV_LOG_ERROR, "requested bitrate is to low\n");
768
/* find average quantizers */
769
avg_quantizer[P_TYPE]=0;
770
for(step=256*256; step>0.0000001; step*=0.5){
771
double expected_bits=0;
772
avg_quantizer[P_TYPE]+= step;
774
avg_quantizer[I_TYPE]= avg_quantizer[P_TYPE]*ABS(s->avctx->i_quant_factor) + s->avctx->i_quant_offset;
775
avg_quantizer[B_TYPE]= avg_quantizer[P_TYPE]*ABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset;
779
+ complexity[I_TYPE]/avg_quantizer[I_TYPE]
780
+ complexity[P_TYPE]/avg_quantizer[P_TYPE]
781
+ complexity[B_TYPE]/avg_quantizer[B_TYPE];
783
if(expected_bits < all_available_bits) avg_quantizer[P_TYPE]-= step;
784
//printf("%f %lld %f\n", expected_bits, all_available_bits, avg_quantizer[P_TYPE]);
786
//printf("qp_i:%f, qp_p:%f, qp_b:%f\n", avg_quantizer[I_TYPE],avg_quantizer[P_TYPE],avg_quantizer[B_TYPE]);
789
available_bits[i]= const_bits[i] + complexity[i]/avg_quantizer[i];
791
//printf("%lld %lld %lld %lld\n", available_bits[I_TYPE], available_bits[P_TYPE], available_bits[B_TYPE], all_available_bits);
793
qscale= av_malloc(sizeof(double)*rcc->num_entries);
794
blured_qscale= av_malloc(sizeof(double)*rcc->num_entries);
796
for(step=256*256; step>0.0000001; step*=0.5){
800
rcc->buffer_index= s->avctx->rc_buffer_size/2;
803
for(i=0; i<rcc->num_entries; i++){
804
qscale[i]= get_qscale(s, &rcc->entry[i], rate_factor, i);
806
assert(filter_size%2==1);
808
/* fixed I/B QP relative to P mode */
809
for(i=rcc->num_entries-1; i>=0; i--){
810
RateControlEntry *rce= &rcc->entry[i];
812
qscale[i]= get_diff_limited_q(s, rce, qscale[i]);
816
for(i=0; i<rcc->num_entries; i++){
817
RateControlEntry *rce= &rcc->entry[i];
818
const int pict_type= rce->new_pict_type;
820
double q=0.0, sum=0.0;
822
for(j=0; j<filter_size; j++){
823
int index= i+j-filter_size/2;
825
double coeff= a->qblur==0 ? 1.0 : exp(-d*d/(a->qblur * a->qblur));
827
if(index < 0 || index >= rcc->num_entries) continue;
828
if(pict_type != rcc->entry[index].new_pict_type) continue;
829
q+= qscale[index] * coeff;
832
blured_qscale[i]= q/sum;
835
/* find expected bits */
836
for(i=0; i<rcc->num_entries; i++){
837
RateControlEntry *rce= &rcc->entry[i];
839
rce->new_qscale= modify_qscale(s, rce, blured_qscale[i], i);
840
bits= qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits;
841
//printf("%d %f\n", rce->new_bits, blured_qscale[i]);
842
bits += 8*ff_vbv_update(s, bits);
844
rce->expected_bits= expected_bits;
845
expected_bits += bits;
848
// printf("%f %d %f\n", expected_bits, (int)all_available_bits, rate_factor);
849
if(expected_bits > all_available_bits) rate_factor-= step;
852
av_free(blured_qscale);
854
if(abs(expected_bits/all_available_bits - 1.0) > 0.01 ){
855
av_log(s->avctx, AV_LOG_ERROR, "Error: 2pass curve failed to converge\n");