mirror of https://git.ffmpeg.org/ffmpeg.git
403 lines
14 KiB
C
403 lines
14 KiB
C
/*
|
|
* Rate control for video encoders
|
|
*
|
|
* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* This library 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 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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 this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#include "avcodec.h"
|
|
#include "dsputil.h"
|
|
#include "mpegvideo.h"
|
|
|
|
#define STATS_FILE "lavc_stats.txt"
|
|
|
|
static int init_pass2(MpegEncContext *s);
|
|
|
|
void ff_write_pass1_stats(MpegEncContext *s){
|
|
RateControlContext *rcc= &s->rc_context;
|
|
// fprintf(c->stats_file, "type:%d q:%d icount:%d pcount:%d scount:%d itex:%d ptex%d mv:%d misc:%d fcode:%d bcode:%d\")
|
|
fprintf(rcc->stats_file, "in:%d out:%d type:%d q:%d itex:%d ptex:%d mv:%d misc:%d fcode:%d bcode:%d\n",
|
|
s->picture_number, s->input_picture_number - s->max_b_frames, s->pict_type,
|
|
s->qscale, s->i_tex_bits, s->p_tex_bits, s->mv_bits, s->misc_bits, s->f_code, s->b_code);
|
|
}
|
|
|
|
int ff_rate_control_init(MpegEncContext *s)
|
|
{
|
|
RateControlContext *rcc= &s->rc_context;
|
|
emms_c();
|
|
|
|
if(s->flags&CODEC_FLAG_PASS1){
|
|
rcc->stats_file= fopen(STATS_FILE, "w");
|
|
if(!rcc->stats_file){
|
|
fprintf(stderr, "failed to open " STATS_FILE "\n");
|
|
return -1;
|
|
}
|
|
} else if(s->flags&CODEC_FLAG_PASS2){
|
|
int size;
|
|
int i;
|
|
|
|
rcc->stats_file= fopen(STATS_FILE, "r");
|
|
if(!rcc->stats_file){
|
|
fprintf(stderr, "failed to open " STATS_FILE "\n");
|
|
return -1;
|
|
}
|
|
|
|
/* find number of pics without reading the file twice :) */
|
|
fseek(rcc->stats_file, 0, SEEK_END);
|
|
size= ftell(rcc->stats_file);
|
|
fseek(rcc->stats_file, 0, SEEK_SET);
|
|
|
|
size/= 64; // we need at least 64 byte to store a line ...
|
|
rcc->entry = (RateControlEntry*)av_mallocz(size*sizeof(RateControlEntry));
|
|
|
|
for(i=0; !feof(rcc->stats_file); i++){
|
|
RateControlEntry *rce;
|
|
int picture_number;
|
|
int e;
|
|
|
|
e= fscanf(rcc->stats_file, "in:%d ", &picture_number);
|
|
rce= &rcc->entry[picture_number];
|
|
e+=fscanf(rcc->stats_file, "out:%*d type:%d q:%d itex:%d ptex:%d mv:%d misc:%d fcode:%*d bcode:%*d\n",
|
|
&rce->pict_type, &rce->qscale, &rce->i_tex_bits, &rce->p_tex_bits, &rce->mv_bits, &rce->misc_bits);
|
|
if(e!=7){
|
|
fprintf(stderr, STATS_FILE " is damaged\n");
|
|
return -1;
|
|
}
|
|
}
|
|
rcc->num_entries= i;
|
|
|
|
if(init_pass2(s) < 0) return -1;
|
|
}
|
|
|
|
/* no 2pass stuff, just normal 1-pass */
|
|
//initial values, they dont really matter as they will be totally different within a few frames
|
|
s->i_pred.coeff= s->p_pred.coeff= 7.0;
|
|
s->i_pred.count= s->p_pred.count= 1.0;
|
|
|
|
s->i_pred.decay= s->p_pred.decay= 0.4;
|
|
|
|
// use more bits at the beginning, otherwise high motion at the begin will look like shit
|
|
s->qsum=100 * s->qmin;
|
|
s->qcount=100;
|
|
|
|
s->short_term_qsum=0.001;
|
|
s->short_term_qcount=0.001;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void ff_rate_control_uninit(MpegEncContext *s)
|
|
{
|
|
RateControlContext *rcc= &s->rc_context;
|
|
emms_c();
|
|
|
|
if(rcc->stats_file)
|
|
fclose(rcc->stats_file);
|
|
rcc->stats_file = NULL;
|
|
av_freep(&rcc->entry);
|
|
}
|
|
|
|
//----------------------------------
|
|
// 1 Pass Code
|
|
|
|
static double predict(Predictor *p, double q, double var)
|
|
{
|
|
return p->coeff*var / (q*p->count);
|
|
}
|
|
|
|
static void update_predictor(Predictor *p, double q, double var, double size)
|
|
{
|
|
double new_coeff= size*q / (var + 1);
|
|
if(var<1000) return;
|
|
|
|
p->count*= p->decay;
|
|
p->coeff*= p->decay;
|
|
p->count++;
|
|
p->coeff+= new_coeff;
|
|
}
|
|
|
|
int ff_rate_estimate_qscale(MpegEncContext *s)
|
|
{
|
|
int qmin= s->qmin;
|
|
int qmax= s->qmax;
|
|
int rate_q=5;
|
|
float q;
|
|
int qscale;
|
|
float br_compensation;
|
|
double diff;
|
|
double short_term_q;
|
|
double long_term_q;
|
|
double fps;
|
|
int picture_number= s->input_picture_number - s->max_b_frames;
|
|
int64_t wanted_bits;
|
|
emms_c();
|
|
|
|
fps= (double)s->frame_rate / FRAME_RATE_BASE;
|
|
wanted_bits= (uint64_t)(s->bit_rate*(double)picture_number/fps);
|
|
// printf("%d %d %d\n", picture_number, (int)wanted_bits, (int)s->total_bits);
|
|
|
|
if(s->pict_type==B_TYPE){
|
|
qmin= (int)(qmin*s->b_quant_factor+s->b_quant_offset + 0.5);
|
|
qmax= (int)(qmax*s->b_quant_factor+s->b_quant_offset + 0.5);
|
|
}
|
|
if(qmin<1) qmin=1;
|
|
if(qmax>31) qmax=31;
|
|
if(qmax<=qmin) qmax= qmin;
|
|
|
|
/* update predictors */
|
|
if(picture_number>2){
|
|
if(s->pict_type!=B_TYPE && s->last_non_b_pict_type == P_TYPE){
|
|
//printf("%d %d %d %f\n", s->qscale, s->last_mc_mb_var, s->frame_bits, s->p_pred.coeff);
|
|
update_predictor(&s->p_pred, s->last_non_b_qscale, s->last_non_b_mc_mb_var, s->pb_frame_bits);
|
|
}
|
|
}
|
|
|
|
if(s->pict_type == I_TYPE){
|
|
short_term_q= s->short_term_qsum/s->short_term_qcount;
|
|
|
|
long_term_q= s->qsum/s->qcount*(s->total_bits+1)/(wanted_bits+1); //+1 to avoid nan & 0
|
|
|
|
q= 1/((1/long_term_q - 1/short_term_q)*s->qcompress + 1/short_term_q);
|
|
}else if(s->pict_type==B_TYPE){
|
|
q= (int)(s->last_non_b_qscale*s->b_quant_factor+s->b_quant_offset + 0.5);
|
|
}else{ //P Frame
|
|
int i;
|
|
int diff, best_diff=1000000000;
|
|
for(i=1; i<=31; i++){
|
|
diff= predict(&s->p_pred, i, s->mc_mb_var_sum) - (double)s->bit_rate/fps;
|
|
if(diff<0) diff= -diff;
|
|
if(diff<best_diff){
|
|
best_diff= diff;
|
|
rate_q= i;
|
|
}
|
|
}
|
|
s->short_term_qsum*=s->qblur;
|
|
s->short_term_qcount*=s->qblur;
|
|
|
|
s->short_term_qsum+= rate_q;
|
|
s->short_term_qcount++;
|
|
short_term_q= s->short_term_qsum/s->short_term_qcount;
|
|
|
|
long_term_q= s->qsum/s->qcount*(s->total_bits+1)/(wanted_bits+1); //+1 to avoid nan & 0
|
|
|
|
// q= (long_term_q - short_term_q)*s->qcompress + short_term_q;
|
|
q= 1/((1/long_term_q - 1/short_term_q)*s->qcompress + 1/short_term_q);
|
|
}
|
|
|
|
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;
|
|
q/=br_compensation;
|
|
//printf("%f %f %f\n", q, br_compensation, short_term_q);
|
|
qscale= (int)(q + 0.5);
|
|
if (qscale<qmin) qscale=qmin;
|
|
else if(qscale>qmax) qscale=qmax;
|
|
|
|
if(s->pict_type!=B_TYPE){
|
|
s->qsum+= qscale;
|
|
s->qcount++;
|
|
if (qscale<s->last_non_b_qscale-s->max_qdiff) qscale=s->last_non_b_qscale-s->max_qdiff;
|
|
else if(qscale>s->last_non_b_qscale+s->max_qdiff) qscale=s->last_non_b_qscale+s->max_qdiff;
|
|
}
|
|
//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);
|
|
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);
|
|
int num_frames[5]={0,0,0,0,0};
|
|
double rate_factor=0;
|
|
double step;
|
|
int last_i_frame=-10000000;
|
|
|
|
/* 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;
|
|
}
|
|
}
|
|
|
|
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;
|
|
num_frames[rce->new_pict_type]++;
|
|
}
|
|
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;
|
|
}
|
|
|
|
// avg_complexity= complexity/rcc->num_entries;
|
|
avg_quantizer[P_TYPE]=
|
|
avg_quantizer[I_TYPE]= (complexity[I_TYPE]+complexity[P_TYPE] + complexity[B_TYPE]/s->b_quant_factor)
|
|
/ (all_available_bits - all_const_bits);
|
|
avg_quantizer[B_TYPE]= avg_quantizer[P_TYPE]*s->b_quant_factor + s->b_quant_offset;
|
|
//printf("avg quantizer: %f %f\n", 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);
|
|
|
|
for(step=256*256; step>0.0000001; step*=0.5){
|
|
uint64_t expected_bits=0;
|
|
rate_factor+= step;
|
|
/* find qscale */
|
|
for(i=0; i<rcc->num_entries; i++){
|
|
RateControlEntry *rce= &rcc->entry[i];
|
|
double short_term_q, q, bits_left;
|
|
const int pict_type= rce->new_pict_type;
|
|
int qmin= s->qmin;
|
|
int qmax= s->qmax;
|
|
|
|
if(pict_type==B_TYPE){
|
|
qmin= (int)(qmin*s->b_quant_factor+s->b_quant_offset + 0.5);
|
|
qmax= (int)(qmax*s->b_quant_factor+s->b_quant_offset + 0.5);
|
|
}
|
|
if(qmin<1) qmin=1;
|
|
if(qmax>31) qmax=31;
|
|
if(qmax<=qmin) qmax= qmin;
|
|
|
|
switch(s->rc_strategy){
|
|
case 0:
|
|
bits_left= available_bits[pict_type]/num_frames[pict_type]*rate_factor - rce->misc_bits - rce->mv_bits;
|
|
if(bits_left<1.0) bits_left=1.0;
|
|
short_term_q= rce->qscale*(rce->i_tex_bits + rce->p_tex_bits)/bits_left;
|
|
break;
|
|
case 1:
|
|
bits_left= (available_bits[pict_type] - const_bits[pict_type])/num_frames[pict_type]*rate_factor;
|
|
if(bits_left<1.0) bits_left=1.0;
|
|
short_term_q= rce->qscale*(rce->i_tex_bits + rce->p_tex_bits)/bits_left;
|
|
break;
|
|
case 2:
|
|
bits_left= available_bits[pict_type]/num_frames[pict_type]*rate_factor;
|
|
if(bits_left<1.0) bits_left=1.0;
|
|
short_term_q= rce->qscale*(rce->i_tex_bits + rce->p_tex_bits + rce->misc_bits + rce->mv_bits)/bits_left;
|
|
break;
|
|
default:
|
|
fprintf(stderr, "unknown strategy\n");
|
|
short_term_q=3; //gcc warning fix
|
|
}
|
|
|
|
if(short_term_q>31.0) short_term_q=31.0;
|
|
else if (short_term_q<1.0) short_term_q=1.0;
|
|
|
|
q= 1/((1/avg_quantizer[pict_type] - 1/short_term_q)*s->qcompress + 1/short_term_q);
|
|
if (q<qmin) q=qmin;
|
|
else if(q>qmax) q=qmax;
|
|
printf("lq:%f, sq:%f t:%f q:%f\n", avg_quantizer[rce->pict_type], short_term_q, bits_left, q);
|
|
rce->new_qscale= q;
|
|
}
|
|
|
|
/* smooth curve */
|
|
|
|
/* find expected bits */
|
|
for(i=0; i<rcc->num_entries; i++){
|
|
RateControlEntry *rce= &rcc->entry[i];
|
|
double factor= rce->qscale / rce->new_qscale;
|
|
|
|
rce->expected_bits= expected_bits;
|
|
expected_bits += (int)(rce->misc_bits + rce->mv_bits + (rce->i_tex_bits + rce->p_tex_bits)*factor + 0.5);
|
|
}
|
|
|
|
// printf("%d %d %f\n", (int)expected_bits, (int)all_available_bits, rate_factor);
|
|
if(expected_bits > all_available_bits) rate_factor-= step;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ff_rate_estimate_qscale_pass2(MpegEncContext *s)
|
|
{
|
|
int qmin= s->qmin;
|
|
int qmax= s->qmax;
|
|
float q;
|
|
int qscale;
|
|
float br_compensation;
|
|
double diff;
|
|
int picture_number= s->picture_number;
|
|
RateControlEntry *rce= &s->rc_context.entry[picture_number];
|
|
int64_t wanted_bits= rce->expected_bits;
|
|
emms_c();
|
|
|
|
// printf("%d %d %d\n", picture_number, (int)wanted_bits, (int)s->total_bits);
|
|
|
|
if(s->pict_type==B_TYPE){
|
|
qmin= (int)(qmin*s->b_quant_factor+s->b_quant_offset + 0.5);
|
|
qmax= (int)(qmax*s->b_quant_factor+s->b_quant_offset + 0.5);
|
|
}
|
|
if(qmin<1) qmin=1;
|
|
if(qmax>31) qmax=31;
|
|
if(qmax<=qmin) qmax= qmin;
|
|
|
|
q= rce->new_qscale;
|
|
|
|
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;
|
|
q/=br_compensation;
|
|
|
|
qscale= (int)(q + 0.5);
|
|
if (qscale<qmin) qscale=qmin;
|
|
else if(qscale>qmax) qscale=qmax;
|
|
// printf("%d %d %d %d type:%d\n", qmin, qscale, qmax, picture_number, s->pict_type); fflush(stdout);
|
|
return qscale;
|
|
}
|