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#include "VolCtrl.h"
#include <cmath>
static double lin2log_vol(double v)
{
return v>0 ? 20.0*log10(v) : -100.0;
}
static double log2lin_vol(double v)
{
return v<=-100.0 ? 0 : pow(10.0,v/20.0);
}
static double lin2log_pan(double p)
{
if (p==0) return 0;
else return lin2log_vol(1.0-fabs(p)) * (p>0 ? -1 : 1);
}
static double log2lin_pan(double p)
{
if (p==0) return 0;
else return (1.0-log2lin_vol(-fabs(p))) * (p>0 ? 1 :-1);
}
void DsVolCtrl::MapVol(double Vol,double Pan,double &OutNewVol,double &OutNewPan)
{
DestVolHack=Vol;
DestPanHack=Pan;
double NewVol = 0.0;
double NewPan = 0.0;
switch(VolMode)
{
case 0:
NewVol=lin2log_vol(Vol);
NewPan=lin2log_pan(Pan);
NewVol=Vol>0 ? 20*log10(Vol) : -100.0;//in negative db
if (Pan==0) NewPan=0;
else
{
double d= 1.0 - fabs(Pan);
d = d>0 ? 20*log10(d) : -1000.0;
if (Pan>0) d=-d;
NewPan=d;
}
break;
case 1:
{
double left,right;
NewVol=left=right=(double)LogVolMin * (Vol-1.0);
left+=lin2log_vol(sqrt(0.5-0.5*Pan));
right+=lin2log_vol(sqrt(0.5+0.5*Pan));
//NewVol=left>right ? left : right;
NewPan=right-left;
}
break;
case 2:
{
double left,right;
NewVol=left=right=100.0 * (pow(Vol,0.25)-1.0);
left+=lin2log_vol(sqrt(0.5-0.5*Pan));
right+=lin2log_vol(sqrt(0.5+0.5*Pan));
//NewVol=left>right ? left : right;
NewPan=right-left;
}
break;
}
if (NewVol<-100.0) NewVol=-100.0;
else if (NewVol>0) NewVol=0;
if (NewPan<-100.0) NewPan=-100.0;
else if (NewPan>100.0) NewPan=100.0;
OutNewVol=NewVol;
OutNewPan=NewPan;
}
DsVolCtrl::DsVolCtrl(int _VolMode,double _LogVolMin,bool _LogFades)
{
IsFading=0;
LogFades=_LogFades;
VolMode=_VolMode;
LogVolMin=_LogVolMin;
FadeSrcTime=FadeDstTime=-1;
CurTime=0;
CurVol=1;
LastVol=0;
CurPan=0;
LastPan=0;
DestPanHack = 0;
DestVolHack = 0;
FadeDstPan = 0;
FadeDstVol = 0;
FadeSrcPan = 0;
FadeSrcVol = 0;
}
void DsVolCtrl::SetFade(__int64 duration,double destvol,double destpan)
{
FadeSrcTime=CurTime;
FadeDstTime=CurTime+duration;
FadeSrcVol=CurVol;
FadeSrcPan=CurPan;
IsFading=1;
MapVol(destvol,destpan,FadeDstVol,FadeDstPan);
}
void DsVolCtrl::SetTime(__int64 time)
{
CurTime=time;
}
void DsVolCtrl::SetVolume(double vol)
{
if (Fading()) SetFade(FadeDstTime-CurTime,vol,DestPanHack);
else MapVol(vol,DestPanHack,CurVol,CurPan);
}
void DsVolCtrl::SetPan(double pan)
{
if (Fading()) SetFade(FadeDstTime-CurTime,DestVolHack,pan);
else MapVol(DestVolHack,pan,CurVol,CurPan);
}
void DsVolCtrl::Apply(IDirectSoundBuffer * pDSB)
{
if (Fading())
{
if (LogFades)
{
CurVol= FadeSrcVol + (FadeDstVol-FadeSrcVol) * (double)(CurTime-FadeSrcTime) / (double)(FadeDstTime-FadeSrcTime);
CurPan= FadeSrcPan + (FadeDstPan-FadeSrcPan) * (double)(CurTime-FadeSrcTime) / (double)(FadeDstTime-FadeSrcTime);
}
else
{
double SrcVol=log2lin_vol(FadeSrcVol);
double DstVol=log2lin_vol(FadeDstVol);
double SrcPan=log2lin_pan(FadeSrcPan);
double DstPan=log2lin_pan(FadeDstPan);
CurVol=lin2log_vol( SrcVol + (DstVol-SrcVol) * (double)(CurTime-FadeSrcTime) / (double)(FadeDstTime-FadeSrcTime) );
CurPan=lin2log_pan( SrcPan + (DstPan-SrcPan) * (double)(CurTime-FadeSrcTime) / (double)(FadeDstTime-FadeSrcTime) );
}
}
else if (FadeDstTime>=0)
{
CurVol=FadeDstVol;
CurPan=FadeDstPan;
FadeDstTime=-1;
IsFading=0;
}
if (CurVol!=LastVol)
{
LastVol=CurVol;
pDSB->SetVolume((long)(CurVol*100.0));
}
if (CurPan!=LastPan)
{
LastPan=CurPan;
pDSB->SetPan((long)(CurPan*100.0));
}
}
bool DsVolCtrl::Fading()
{
return IsFading && CurTime<FadeDstTime;
}
__int64 DsVolCtrl::RelFade(__int64 max,double destvol)
{
return (__int64)(fabs(destvol-DestVolHack)*(double)max);
}
double DsVolCtrl::Stat_GetVolLeft()
{
return CurPan<0 ? CurVol : CurVol - CurPan;
}
double DsVolCtrl::Stat_GetVolRight()
{
return CurPan>0 ? CurVol : CurVol + CurPan;
}
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