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DAHDSR.cpp
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DAHDSR.cpp
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/*
==============================================================================
DAHDSR.cpp
Created: 6 Oct 2020 1:07:11pm
Author: Hayden Setlik
==============================================================================
*/
#include "DAHDSR.h"
float DAHDSR::process(float input)
{
switch(currentPhase)
{
case delayPhase:
{
if(valueOf(delayId) > 0)
{
if(samplesIntoPhase == 0)
samplesInPhase = phaseSafe(floor(delayTime * (sampleRate / 1000)));
samplesIntoPhase += 1;
if(samplesIntoPhase >= samplesInPhase)
{
currentPhase = attackPhase;
samplesIntoPhase = 0;
samplesInPhase = phaseSafe(floor(attackTime * (sampleRate / 1000)));
factor = exp((log(1.0f) - log(minLevel)) /samplesInPhase);
}
output = 0.0f;
}
else
{
currentPhase = attackPhase;
samplesInPhase = phaseSafe(floor(attackTime * (sampleRate / 1000)));
factor = exp((log(1.0f) - log(minLevel)) /samplesInPhase);
samplesIntoPhase = 0;
}
break;
}
case attackPhase:
{
if(samplesIntoPhase == 0)
output = minLevel;
output = output * factor;
samplesIntoPhase++;
if(samplesIntoPhase >= samplesInPhase)
{
currentPhase = holdPhase;
samplesIntoPhase = 0;
samplesInPhase = valueOf(holdId) * (sampleRate / 1000);
}
break;
}
case holdPhase:
{
if(holdTime != 0)
{
samplesIntoPhase += 1;
if(samplesIntoPhase > samplesInPhase)
{
currentPhase = decayPhase;
samplesIntoPhase = 0;
samplesInPhase = phaseSafe(decayTime * (sampleRate / 1000));
factor = exp((log(sustainLevel) - log(1.0f)) /samplesInPhase);
}
output = 1.0f;
}
else
{
currentPhase = decayPhase;
samplesIntoPhase = 0;
samplesInPhase = phaseSafe(decayTime * (sampleRate / 1000));
factor = exp((log(sustainLevel) - log(1.0f)) /samplesInPhase);;
}
break;
}
case decayPhase:
{
output = output * factor;
samplesIntoPhase += 1;
if(samplesIntoPhase >= samplesInPhase)
{
currentPhase = sustainPhase;
samplesIntoPhase = 0;
output = sustainLevel;
}
break;
}
case sustainPhase:
{
output = sustainLevel;
break;
}
case releasePhase:
{
output = output * factor;
samplesIntoPhase += 1;
if(samplesIntoPhase >= samplesInPhase)
currentPhase = noteOff;
break;
}
case noteOff:
{
samplesIntoPhase = 0;
output = 0.0f;
break;
}
default:
break;
}
if(isnan(output))
{
output = 0.0f;
printf("Envelope output is nan\n");
}
return input * output;
}