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= (double)s->avctx->frame_rate / (double)s->avctx->frame_rate_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 && !( s->flags&CODEC_FLAG_PASS1)){ //MEANX: Dont do min/max in pass1
q=bitrate_constraint(s, rce, q, frame_num);
}
//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;
}
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 independent 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, *blurred_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[FF_I_TYPE] + const_bits[FF_P_TYPE] + const_bits[FF_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);
blurred_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;
}
blurred_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, blurred_qscale[i], i);
bits= qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits;
//printf("%d %f\n", rce->new_bits, blurred_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(blurred_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 += av_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;
}
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, frame_num);
/* modulation */
if(s->avctx->rc_qmod_freq && frame_num%s->avctx->rc_qmod_freq==0 && pict_type==FF_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) * s->avctx->rc_min_vbv_overflow_use, 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 * s->avctx->rc_max_available_vbv_use, 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;
}
/**
* 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 == FF_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 == FF_I_TYPE,
rce->pict_type == FF_P_TYPE,
rce->pict_type == FF_B_TYPE,
rcc->qscale_sum[pict_type] / (double)rcc->frame_count[pict_type],
a->qcompress,
/* rcc->last_qscale_for[FF_I_TYPE],
rcc->last_qscale_for[FF_P_TYPE],
rcc->last_qscale_for[FF_B_TYPE],
rcc->next_non_b_qscale,*/
rcc->i_cplx_sum[FF_I_TYPE] / (double)rcc->frame_count[FF_I_TYPE],
rcc->i_cplx_sum[FF_P_TYPE] / (double)rcc->frame_count[FF_P_TYPE],
rcc->p_cplx_sum[FF_P_TYPE] / (double)rcc->frame_count[FF_P_TYPE],
rcc->p_cplx_sum[FF_B_TYPE] / (double)rcc->frame_count[FF_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);
#ifdef __GNUC__
if (isnan(bits)) {
av_log(s->avctx, AV_LOG_ERROR, "Error evaluating rc_eq \"%s\"\n", s->avctx->rc_eq);
return -1;
}
#endif
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==FF_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==FF_B_TYPE && s->avctx->b_quant_factor<0.0)
q= -q*s->avctx->b_quant_factor + s->avctx->b_quant_offset;
if(q<1) q=1;
return q;
}
static int init_pass2(MpegEncContext *s)
{
RateControlContext *rcc= &s->rc_context;
AVCodecContext *a= s->avctx;
int i;
double fps= (double)s->avctx->frame_rate / (double)s->avctx->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)(a->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];
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 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= av_malloc(sizeof(double)*rcc->num_entries);
blured_qscale= av_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 */
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;
}
// printf("%f %d %f\n", expected_bits, (int)all_available_bits, rate_factor);
if(expected_bits > all_available_bits) rate_factor-= step;
}
av_free(qscale);
av_free(blured_qscale);
if(abs(expected_bits/all_available_bits - 1.0) > 0.01 ){
av_log(s->avctx, AV_LOG_ERROR, "Error: 2pass curve failed to converge\n");
return -1;
}
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
};
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
};
bits= ff_eval(s->avctx->rc_eq, const_values, const_names, func1, func1_names, NULL, NULL, rce);
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;
}