/home/maxime/Projets/Mixxx/1.10/mixxx/src/engine/enginexfader.cpp

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#include "defs.h"
#include "enginexfader.h"

float EngineXfader::getCalibration(float transform)
{
        //get the transform_root of -3db (.5)
        return pow(.5, 1./transform);
}

void EngineXfader::getXfadeGains(float &gain1, float &gain2, float xfadePosition, float transform, float calibration)
{
        //Apply Calibration
        if(calibration != 0.)
                xfadePosition *= calibration;
         
        float xfadePositionLeft = xfadePosition - calibration;
        float xfadePositionRight = xfadePosition + calibration;

        if(xfadePositionLeft < 0) //on left side
        {
                xfadePositionLeft *= -1;
                gain2 = (1. - (1. * pow(xfadePositionLeft, transform)));
        }
        else
                gain2 = 1.;
        if(xfadePositionRight > 0) //right side
        {
                gain1 = (1. - (1. * pow(xfadePositionRight, transform)));
        }
        else
                gain1 = 1.;
        
        //prevent phase reversal
        if(gain1 < 0.)
                gain1 = 0.;
        if(gain2 < 0.)
                gain2 = 0.;

}