diff options
Diffstat (limited to 'contrib/ffmpeg/libavcodec/ratecontrol.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/ratecontrol.c | 944 |
1 files changed, 944 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/ratecontrol.c b/contrib/ffmpeg/libavcodec/ratecontrol.c new file mode 100644 index 000000000..d96c837e6 --- /dev/null +++ b/contrib/ffmpeg/libavcodec/ratecontrol.c @@ -0,0 +1,944 @@ +/* + * Rate control for video encoders + * + * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file ratecontrol.c + * Rate control for video encoders. + */ + +#include "avcodec.h" +#include "dsputil.h" +#include "ratecontrol.h" +#include "mpegvideo.h" +#include "eval.h" + +#undef NDEBUG // allways check asserts, the speed effect is far too small to disable them +#include <assert.h> + +#ifndef M_E +#define M_E 2.718281828 +#endif + +static int init_pass2(MpegEncContext *s); +static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num); + +void ff_write_pass1_stats(MpegEncContext *s){ + 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", + s->current_picture_ptr->display_picture_number, s->current_picture_ptr->coded_picture_number, s->pict_type, + s->current_picture.quality, s->i_tex_bits, s->p_tex_bits, s->mv_bits, s->misc_bits, + 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); +} + +static inline double qp2bits(RateControlEntry *rce, double qp){ + if(qp<=0.0){ + av_log(NULL, AV_LOG_ERROR, "qp<=0.0\n"); + } + return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ qp; +} + +static inline double bits2qp(RateControlEntry *rce, double bits){ + if(bits<0.9){ + av_log(NULL, AV_LOG_ERROR, "bits<0.9\n"); + } + return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits+1)/ bits; +} + +int ff_rate_control_init(MpegEncContext *s) +{ + RateControlContext *rcc= &s->rc_context; + int i; + char *error = NULL; + static const char *const_names[]={ + "PI", + "E", + "iTex", + "pTex", + "tex", + "mv", + "fCode", + "iCount", + "mcVar", + "var", + "isI", + "isP", + "isB", + "avgQP", + "qComp", +/* "lastIQP", + "lastPQP", + "lastBQP", + "nextNonBQP",*/ + "avgIITex", + "avgPITex", + "avgPPTex", + "avgBPTex", + "avgTex", + NULL + }; + static double (*func1[])(void *, double)={ + (void *)bits2qp, + (void *)qp2bits, + NULL + }; + static const char *func1_names[]={ + "bits2qp", + "qp2bits", + NULL + }; + emms_c(); + + rcc->rc_eq_eval = ff_parse(s->avctx->rc_eq, const_names, func1, func1_names, NULL, NULL, &error); + if (!rcc->rc_eq_eval) { + av_log(s->avctx, AV_LOG_ERROR, "Error parsing rc_eq \"%s\": %s\n", s->avctx->rc_eq, error? error : ""); + return -1; + } + + for(i=0; i<5; i++){ + rcc->pred[i].coeff= FF_QP2LAMBDA * 7.0; + rcc->pred[i].count= 1.0; + + rcc->pred[i].decay= 0.4; + rcc->i_cplx_sum [i]= + rcc->p_cplx_sum [i]= + rcc->mv_bits_sum[i]= + rcc->qscale_sum [i]= + rcc->frame_count[i]= 1; // 1 is better cuz of 1/0 and such + rcc->last_qscale_for[i]=FF_QP2LAMBDA * 5; + } + rcc->buffer_index= s->avctx->rc_initial_buffer_occupancy; + + if(s->flags&CODEC_FLAG_PASS2){ + int i; + char *p; + + /* find number of pics */ + p= s->avctx->stats_in; + for(i=-1; p; i++){ + p= strchr(p+1, ';'); + } + i+= s->max_b_frames; + if(i<=0 || i>=INT_MAX / sizeof(RateControlEntry)) + return -1; + rcc->entry = (RateControlEntry*)av_mallocz(i*sizeof(RateControlEntry)); + rcc->num_entries= i; + + /* init all to skipped p frames (with b frames we might have a not encoded frame at the end FIXME) */ + for(i=0; i<rcc->num_entries; i++){ + RateControlEntry *rce= &rcc->entry[i]; + rce->pict_type= rce->new_pict_type=P_TYPE; + rce->qscale= rce->new_qscale=FF_QP2LAMBDA * 2; + rce->misc_bits= s->mb_num + 10; + rce->mb_var_sum= s->mb_num*100; + } + + /* read stats */ + p= s->avctx->stats_in; + for(i=0; i<rcc->num_entries - s->max_b_frames; i++){ + RateControlEntry *rce; + int picture_number; + int e; + char *next; + + next= strchr(p, ';'); + if(next){ + (*next)=0; //sscanf in unbelieavle slow on looong strings //FIXME copy / dont write + next++; + } + e= sscanf(p, " in:%d ", &picture_number); + + assert(picture_number >= 0); + assert(picture_number < rcc->num_entries); + rce= &rcc->entry[picture_number]; + + 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", + &rce->pict_type, &rce->qscale, &rce->i_tex_bits, &rce->p_tex_bits, &rce->mv_bits, &rce->misc_bits, + &rce->f_code, &rce->b_code, &rce->mc_mb_var_sum, &rce->mb_var_sum, &rce->i_count, &rce->skip_count, &rce->header_bits); + if(e!=14){ + av_log(s->avctx, AV_LOG_ERROR, "statistics are damaged at line %d, parser out=%d\n", i, e); + return -1; + } + + p= next; + } + + if(init_pass2(s) < 0) return -1; + + //FIXME maybe move to end + if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID) { +#ifdef CONFIG_XVID + return ff_xvid_rate_control_init(s); +#else + av_log(s->avctx, AV_LOG_ERROR, "XviD ratecontrol requires libavcodec compiled with XviD support\n"); + return -1; +#endif + } + } + + if(!(s->flags&CODEC_FLAG_PASS2)){ + + rcc->short_term_qsum=0.001; + rcc->short_term_qcount=0.001; + + rcc->pass1_rc_eq_output_sum= 0.001; + rcc->pass1_wanted_bits=0.001; + + /* init stuff with the user specified complexity */ + if(s->avctx->rc_initial_cplx){ + for(i=0; i<60*30; i++){ + double bits= s->avctx->rc_initial_cplx * (i/10000.0 + 1.0)*s->mb_num; + RateControlEntry rce; + double q; + + if (i%((s->gop_size+3)/4)==0) rce.pict_type= I_TYPE; + else if(i%(s->max_b_frames+1)) rce.pict_type= B_TYPE; + else rce.pict_type= P_TYPE; + + rce.new_pict_type= rce.pict_type; + rce.mc_mb_var_sum= bits*s->mb_num/100000; + rce.mb_var_sum = s->mb_num; + rce.qscale = FF_QP2LAMBDA * 2; + rce.f_code = 2; + rce.b_code = 1; + rce.misc_bits= 1; + + if(s->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 [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] ++; + + bits= rce.i_tex_bits + rce.p_tex_bits; + + q= get_qscale(s, &rce, rcc->pass1_wanted_bits/rcc->pass1_rc_eq_output_sum, i); + rcc->pass1_wanted_bits+= s->bit_rate/(1/av_q2d(s->avctx->time_base)); //FIXME missbehaves a little for variable fps + } + } + + } + + return 0; +} + +void ff_rate_control_uninit(MpegEncContext *s) +{ + RateControlContext *rcc= &s->rc_context; + emms_c(); + + ff_eval_free(rcc->rc_eq_eval); + av_freep(&rcc->entry); + +#ifdef CONFIG_XVID + if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID) + ff_xvid_rate_control_uninit(s); +#endif +} + +int ff_vbv_update(MpegEncContext *s, int frame_size){ + RateControlContext *rcc= &s->rc_context; + const double fps= 1/av_q2d(s->avctx->time_base); + const int buffer_size= s->avctx->rc_buffer_size; + const double min_rate= s->avctx->rc_min_rate/fps; + const double max_rate= s->avctx->rc_max_rate/fps; + +//printf("%d %f %d %f %f\n", buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate); + if(buffer_size){ + int left; + + rcc->buffer_index-= frame_size; + if(rcc->buffer_index < 0){ + av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n"); + rcc->buffer_index= 0; + } + + left= buffer_size - rcc->buffer_index - 1; + rcc->buffer_index += clip(left, min_rate, max_rate); + + if(rcc->buffer_index > buffer_size){ + int stuffing= ceil((rcc->buffer_index - buffer_size)/8); + + if(stuffing < 4 && s->codec_id == CODEC_ID_MPEG4) + stuffing=4; + rcc->buffer_index -= 8*stuffing; + + if(s->avctx->debug & FF_DEBUG_RC) + av_log(s->avctx, AV_LOG_DEBUG, "stuffing %d bytes\n", stuffing); + + return stuffing; + } + } + return 0; +} + +/** + * modifies the bitrate curve from pass1 for one frame + */ +static double get_qscale(MpegEncContext *s, RateControlEntry *rce, double rate_factor, int frame_num){ + RateControlContext *rcc= &s->rc_context; + AVCodecContext *a= s->avctx; + double q, bits; + const int pict_type= rce->new_pict_type; + const double mb_num= s->mb_num; + int i; + + double const_values[]={ + M_PI, + M_E, + rce->i_tex_bits*rce->qscale, + rce->p_tex_bits*rce->qscale, + (rce->i_tex_bits + rce->p_tex_bits)*(double)rce->qscale, + rce->mv_bits/mb_num, + rce->pict_type == B_TYPE ? (rce->f_code + rce->b_code)*0.5 : rce->f_code, + rce->i_count/mb_num, + rce->mc_mb_var_sum/mb_num, + rce->mb_var_sum/mb_num, + rce->pict_type == I_TYPE, + rce->pict_type == P_TYPE, + rce->pict_type == B_TYPE, + rcc->qscale_sum[pict_type] / (double)rcc->frame_count[pict_type], + a->qcompress, +/* rcc->last_qscale_for[I_TYPE], + rcc->last_qscale_for[P_TYPE], + rcc->last_qscale_for[B_TYPE], + rcc->next_non_b_qscale,*/ + rcc->i_cplx_sum[I_TYPE] / (double)rcc->frame_count[I_TYPE], + rcc->i_cplx_sum[P_TYPE] / (double)rcc->frame_count[P_TYPE], + rcc->p_cplx_sum[P_TYPE] / (double)rcc->frame_count[P_TYPE], + rcc->p_cplx_sum[B_TYPE] / (double)rcc->frame_count[B_TYPE], + (rcc->i_cplx_sum[pict_type] + rcc->p_cplx_sum[pict_type]) / (double)rcc->frame_count[pict_type], + 0 + }; + + bits= ff_parse_eval(rcc->rc_eq_eval, const_values, rce); + if (isnan(bits)) { + av_log(s->avctx, AV_LOG_ERROR, "Error evaluating rc_eq \"%s\"\n", s->avctx->rc_eq); + return -1; + } + + rcc->pass1_rc_eq_output_sum+= bits; + bits*=rate_factor; + if(bits<0.0) bits=0.0; + bits+= 1.0; //avoid 1/0 issues + + /* user override */ + for(i=0; i<s->avctx->rc_override_count; i++){ + RcOverride *rco= s->avctx->rc_override; + if(rco[i].start_frame > frame_num) continue; + if(rco[i].end_frame < frame_num) continue; + + if(rco[i].qscale) + bits= qp2bits(rce, rco[i].qscale); //FIXME move at end to really force it? + else + bits*= rco[i].quality_factor; + } + + q= bits2qp(rce, bits); + + /* I/B difference */ + if (pict_type==I_TYPE && s->avctx->i_quant_factor<0.0) + q= -q*s->avctx->i_quant_factor + s->avctx->i_quant_offset; + else if(pict_type==B_TYPE && s->avctx->b_quant_factor<0.0) + q= -q*s->avctx->b_quant_factor + s->avctx->b_quant_offset; + + return q; +} + +static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q){ + RateControlContext *rcc= &s->rc_context; + AVCodecContext *a= s->avctx; + const int pict_type= rce->new_pict_type; + const double last_p_q = rcc->last_qscale_for[P_TYPE]; + const double last_non_b_q= rcc->last_qscale_for[rcc->last_non_b_pict_type]; + + if (pict_type==I_TYPE && (a->i_quant_factor>0.0 || rcc->last_non_b_pict_type==P_TYPE)) + q= last_p_q *FFABS(a->i_quant_factor) + a->i_quant_offset; + else if(pict_type==B_TYPE && a->b_quant_factor>0.0) + q= last_non_b_q* a->b_quant_factor + a->b_quant_offset; + + /* last qscale / qdiff stuff */ + if(rcc->last_non_b_pict_type==pict_type || pict_type!=I_TYPE){ + double last_q= rcc->last_qscale_for[pict_type]; + const int maxdiff= FF_QP2LAMBDA * a->max_qdiff; + + if (q > last_q + maxdiff) q= last_q + maxdiff; + else if(q < last_q - maxdiff) q= last_q - maxdiff; + } + + rcc->last_qscale_for[pict_type]= q; //Note we cant do that after blurring + + if(pict_type!=B_TYPE) + rcc->last_non_b_pict_type= pict_type; + + return q; +} + +/** + * gets the qmin & qmax for pict_type + */ +static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pict_type){ + int qmin= s->avctx->lmin; + int qmax= s->avctx->lmax; + + assert(qmin <= qmax); + + if(pict_type==B_TYPE){ + qmin= (int)(qmin*FFABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5); + qmax= (int)(qmax*FFABS(s->avctx->b_quant_factor)+s->avctx->b_quant_offset + 0.5); + }else if(pict_type==I_TYPE){ + qmin= (int)(qmin*FFABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5); + qmax= (int)(qmax*FFABS(s->avctx->i_quant_factor)+s->avctx->i_quant_offset + 0.5); + } + + qmin= clip(qmin, 1, FF_LAMBDA_MAX); + qmax= clip(qmax, 1, FF_LAMBDA_MAX); + + if(qmax<qmin) qmax= qmin; + + *qmin_ret= qmin; + *qmax_ret= qmax; +} + +static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q, int frame_num){ + RateControlContext *rcc= &s->rc_context; + int qmin, qmax; + double bits; + const int pict_type= rce->new_pict_type; + const double buffer_size= s->avctx->rc_buffer_size; + const double fps= 1/av_q2d(s->avctx->time_base); + const double min_rate= s->avctx->rc_min_rate / fps; + const double max_rate= s->avctx->rc_max_rate / fps; + + get_qminmax(&qmin, &qmax, s, pict_type); + + /* modulation */ + if(s->avctx->rc_qmod_freq && frame_num%s->avctx->rc_qmod_freq==0 && pict_type==P_TYPE) + q*= s->avctx->rc_qmod_amp; + + bits= qp2bits(rce, q); +//printf("q:%f\n", q); + /* buffer overflow/underflow protection */ + if(buffer_size){ + double expected_size= rcc->buffer_index; + double q_limit; + + if(min_rate){ + double d= 2*(buffer_size - expected_size)/buffer_size; + if(d>1.0) d=1.0; + else if(d<0.0001) d=0.0001; + q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity); + + q_limit= bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index)*3, 1)); + if(q > q_limit){ + if(s->avctx->debug&FF_DEBUG_RC){ + av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit); + } + q= q_limit; + } + } + + if(max_rate){ + double d= 2*expected_size/buffer_size; + if(d>1.0) d=1.0; + else if(d<0.0001) d=0.0001; + q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity); + + q_limit= bits2qp(rce, FFMAX(rcc->buffer_index/3, 1)); + if(q < q_limit){ + if(s->avctx->debug&FF_DEBUG_RC){ + av_log(s->avctx, AV_LOG_DEBUG, "limiting QP %f -> %f\n", q, q_limit); + } + q= q_limit; + } + } + } +//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); + if(s->avctx->rc_qsquish==0.0 || qmin==qmax){ + if (q<qmin) q=qmin; + else if(q>qmax) q=qmax; + }else{ + double min2= log(qmin); + double max2= log(qmax); + + q= log(q); + q= (q - min2)/(max2-min2) - 0.5; + q*= -4.0; + q= 1.0/(1.0 + exp(q)); + q= q*(max2-min2) + min2; + + q= exp(q); + } + + return q; +} + +//---------------------------------- +// 1 Pass Code + +static double predict_size(Predictor *p, double q, double var) +{ + return p->coeff*var / (q*p->count); +} + +/* +static double predict_qp(Predictor *p, double size, double var) +{ +//printf("coeff:%f, count:%f, var:%f, size:%f//\n", p->coeff, p->count, var, size); + return p->coeff*var / (size*p->count); +} +*/ + +static void update_predictor(Predictor *p, double q, double var, double size) +{ + double new_coeff= size*q / (var + 1); + if(var<10) return; + + p->count*= p->decay; + p->coeff*= p->decay; + p->count++; + p->coeff+= new_coeff; +} + +static void adaptive_quantization(MpegEncContext *s, double q){ + int i; + const float lumi_masking= s->avctx->lumi_masking / (128.0*128.0); + const float dark_masking= s->avctx->dark_masking / (128.0*128.0); + const float temp_cplx_masking= s->avctx->temporal_cplx_masking; + const float spatial_cplx_masking = s->avctx->spatial_cplx_masking; + const float p_masking = s->avctx->p_masking; + const float border_masking = s->avctx->border_masking; + float bits_sum= 0.0; + float cplx_sum= 0.0; + float cplx_tab[s->mb_num]; + float bits_tab[s->mb_num]; + const int qmin= s->avctx->mb_lmin; + const int qmax= s->avctx->mb_lmax; + Picture * const pic= &s->current_picture; + const int mb_width = s->mb_width; + const int mb_height = s->mb_height; + + for(i=0; i<s->mb_num; i++){ + const int mb_xy= s->mb_index2xy[i]; + float temp_cplx= sqrt(pic->mc_mb_var[mb_xy]); //FIXME merge in pow() + float spat_cplx= sqrt(pic->mb_var[mb_xy]); + const int lumi= pic->mb_mean[mb_xy]; + float bits, cplx, factor; + int mb_x = mb_xy % s->mb_stride; + int mb_y = mb_xy / s->mb_stride; + int mb_distance; + float mb_factor = 0.0; +#if 0 + if(spat_cplx < q/3) spat_cplx= q/3; //FIXME finetune + if(temp_cplx < q/3) temp_cplx= q/3; //FIXME finetune +#endif + if(spat_cplx < 4) spat_cplx= 4; //FIXME finetune + if(temp_cplx < 4) temp_cplx= 4; //FIXME finetune + + if((s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_INTRA)){//FIXME hq mode + cplx= spat_cplx; + factor= 1.0 + p_masking; + }else{ + cplx= temp_cplx; + factor= pow(temp_cplx, - temp_cplx_masking); + } + factor*=pow(spat_cplx, - spatial_cplx_masking); + + if(lumi>127) + factor*= (1.0 - (lumi-128)*(lumi-128)*lumi_masking); + else + factor*= (1.0 - (lumi-128)*(lumi-128)*dark_masking); + + if(mb_x < mb_width/5){ + mb_distance = mb_width/5 - mb_x; + mb_factor = (float)mb_distance / (float)(mb_width/5); + }else if(mb_x > 4*mb_width/5){ + mb_distance = mb_x - 4*mb_width/5; + mb_factor = (float)mb_distance / (float)(mb_width/5); + } + if(mb_y < mb_height/5){ + mb_distance = mb_height/5 - mb_y; + mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5)); + }else if(mb_y > 4*mb_height/5){ + mb_distance = mb_y - 4*mb_height/5; + mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5)); + } + + factor*= 1.0 - border_masking*mb_factor; + + if(factor<0.00001) factor= 0.00001; + + bits= cplx*factor; + cplx_sum+= cplx; + bits_sum+= bits; + cplx_tab[i]= cplx; + bits_tab[i]= bits; + } + + /* handle qmin/qmax cliping */ + if(s->flags&CODEC_FLAG_NORMALIZE_AQP){ + float factor= bits_sum/cplx_sum; + for(i=0; i<s->mb_num; i++){ + float newq= q*cplx_tab[i]/bits_tab[i]; + newq*= factor; + + if (newq > qmax){ + bits_sum -= bits_tab[i]; + cplx_sum -= cplx_tab[i]*q/qmax; + } + else if(newq < qmin){ + bits_sum -= bits_tab[i]; + cplx_sum -= cplx_tab[i]*q/qmin; + } + } + if(bits_sum < 0.001) bits_sum= 0.001; + if(cplx_sum < 0.001) cplx_sum= 0.001; + } + + for(i=0; i<s->mb_num; i++){ + const int mb_xy= s->mb_index2xy[i]; + float newq= q*cplx_tab[i]/bits_tab[i]; + int intq; + + if(s->flags&CODEC_FLAG_NORMALIZE_AQP){ + newq*= bits_sum/cplx_sum; + } + + intq= (int)(newq + 0.5); + + if (intq > qmax) intq= qmax; + else if(intq < qmin) intq= qmin; +//if(i%s->mb_width==0) printf("\n"); +//printf("%2d%3d ", intq, ff_sqrt(s->mc_mb_var[i])); + s->lambda_table[mb_xy]= intq; + } +} + +void ff_get_2pass_fcode(MpegEncContext *s){ + RateControlContext *rcc= &s->rc_context; + int picture_number= s->picture_number; + RateControlEntry *rce; + + rce= &rcc->entry[picture_number]; + s->f_code= rce->f_code; + s->b_code= rce->b_code; +} + +//FIXME rd or at least approx for dquant + +float ff_rate_estimate_qscale(MpegEncContext *s, int dry_run) +{ + float q; + int qmin, qmax; + 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; + AVCodecContext *a= s->avctx; + RateControlEntry local_rce, *rce; + double bits; + double rate_factor; + int var; + const int pict_type= s->pict_type; + Picture * const pic= &s->current_picture; + emms_c(); + +#ifdef CONFIG_XVID + if((s->flags&CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID) + return ff_xvid_rate_estimate_qscale(s, dry_run); +#endif + + get_qminmax(&qmin, &qmax, s, pict_type); + + fps= 1/av_q2d(s->avctx->time_base); +//printf("input_pic_num:%d pic_num:%d frame_rate:%d\n", s->input_picture_number, s->picture_number, s->frame_rate); + /* update predictors */ + if(picture_number>2 && !dry_run){ + 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= (a->bit_rate_tolerance - diff)/a->bit_rate_tolerance; + if(br_compensation<=0.0) br_compensation=0.001; + + var= pict_type == I_TYPE ? pic->mb_var_sum : pic->mc_mb_var_sum; + + short_term_q = 0; /* avoid warning */ + 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= pic->mc_mb_var_sum; + rce->mb_var_sum = pic-> mb_var_sum; + rce->qscale = FF_QP2LAMBDA * 2; + rce->f_code = s->f_code; + rce->b_code = s->b_code; + rce->misc_bits= 1; + + 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_rc_eq_output_sum * br_compensation; + + q= get_qscale(s, rce, rate_factor, picture_number); + if (q < 0) + return -1; + + assert(q>0.0); +//printf("%f ", q); + q= get_diff_limited_q(s, rce, q); +//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*=a->qblur; + rcc->short_term_qcount*=a->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); + } + assert(q>0.0); + + q= modify_qscale(s, rce, q, picture_number); + + rcc->pass1_wanted_bits+= s->bit_rate/fps; + + assert(q>0.0); + } + + if(s->avctx->debug&FF_DEBUG_RC){ + 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", + av_get_pict_type_char(pict_type), qmin, q, qmax, picture_number, (int)wanted_bits/1000, (int)s->total_bits/1000, + br_compensation, short_term_q, s->frame_bits, pic->mb_var_sum, pic->mc_mb_var_sum, s->bit_rate/1000, (int)fps + ); + } + + if (q<qmin) q=qmin; + else if(q>qmax) q=qmax; + + if(s->adaptive_quant) + adaptive_quantization(s, q); + else + q= (int)(q + 0.5); + + if(!dry_run){ + rcc->last_qscale= q; + rcc->last_mc_mb_var_sum= pic->mc_mb_var_sum; + rcc->last_mb_var_sum= pic->mb_var_sum; + } +#if 0 +{ + static int mvsum=0, texsum=0; + mvsum += s->mv_bits; + texsum += s->i_tex_bits + s->p_tex_bits; + printf("%d %d//\n\n", mvsum, texsum); +} +#endif + return q; +} + +//---------------------------------------------- +// 2-Pass code + +static int init_pass2(MpegEncContext *s) +{ + RateControlContext *rcc= &s->rc_context; + AVCodecContext *a= s->avctx; + int i, toobig; + double fps= 1/av_q2d(s->avctx->time_base); + double complexity[5]={0,0,0,0,0}; // aproximate bits at quant=1 + uint64_t const_bits[5]={0,0,0,0,0}; // quantizer idependant bits + 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)(a->qblur*4) | 1; + double expected_bits; + double *qscale, *blured_qscale, qscale_sum; + + /* find complexity & const_bits & decide the pict_types */ + for(i=0; i<rcc->num_entries; i++){ + RateControlEntry *rce= &rcc->entry[i]; + + rce->new_pict_type= rce->pict_type; + 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){ + av_log(s->avctx, AV_LOG_ERROR, "requested bitrate is too low\n"); + return -1; + } + + qscale= av_malloc(sizeof(double)*rcc->num_entries); + blured_qscale= av_malloc(sizeof(double)*rcc->num_entries); + toobig = 0; + + 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 */ + for(i=rcc->num_entries-1; i>=0; i--){ + RateControlEntry *rce= &rcc->entry[i]; + + qscale[i]= get_diff_limited_q(s, rce, 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= a->qblur==0 ? 1.0 : exp(-d*d/(a->qblur * a->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]); + bits += 8*ff_vbv_update(s, bits); + + rce->expected_bits= expected_bits; + expected_bits += bits; + } + + /* + av_log(s->avctx, AV_LOG_INFO, + "expected_bits: %f all_available_bits: %d rate_factor: %f\n", + expected_bits, (int)all_available_bits, rate_factor); + */ + if(expected_bits > all_available_bits) { + rate_factor-= step; + ++toobig; + } + } + av_free(qscale); + av_free(blured_qscale); + + /* check bitrate calculations and print info */ + qscale_sum = 0.0; + for(i=0; i<rcc->num_entries; i++){ + /* av_log(s->avctx, AV_LOG_DEBUG, "[lavc rc] entry[%d].new_qscale = %.3f qp = %.3f\n", + i, rcc->entry[i].new_qscale, rcc->entry[i].new_qscale / FF_QP2LAMBDA); */ + qscale_sum += clip(rcc->entry[i].new_qscale / FF_QP2LAMBDA, s->avctx->qmin, s->avctx->qmax); + } + assert(toobig <= 40); + av_log(s->avctx, AV_LOG_DEBUG, + "[lavc rc] requested bitrate: %d bps expected bitrate: %d bps\n", + s->bit_rate, + (int)(expected_bits / ((double)all_available_bits/s->bit_rate))); + av_log(s->avctx, AV_LOG_DEBUG, + "[lavc rc] estimated target average qp: %.3f\n", + (float)qscale_sum / rcc->num_entries); + if (toobig == 0) { + av_log(s->avctx, AV_LOG_INFO, + "[lavc rc] Using all of requested bitrate is not " + "necessary for this video with these parameters.\n"); + } else if (toobig == 40) { + av_log(s->avctx, AV_LOG_ERROR, + "[lavc rc] Error: bitrate too low for this video " + "with these parameters.\n"); + return -1; + } else if (fabs(expected_bits/all_available_bits - 1.0) > 0.01) { + av_log(s->avctx, AV_LOG_ERROR, + "[lavc rc] Error: 2pass curve failed to converge\n"); + return -1; + } + + return 0; +} |