/*
* File: Capacitor.cpp
*
* Version: 1.0
*
* Created: 2/1/17
*
* Copyright: Copyright � 2017 Airwindows, All Rights Reserved
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/*=============================================================================
Capacitor.cpp
=============================================================================*/
#include "Capacitor.h"
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
COMPONENT_ENTRY(Capacitor)
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Capacitor::Capacitor
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Capacitor::Capacitor(AudioUnit component)
: AUEffectBase(component)
{
CreateElements();
Globals()->UseIndexedParameters(kNumberOfParameters);
SetParameter(kParam_One, kDefaultValue_ParamOne );
SetParameter(kParam_Two, kDefaultValue_ParamTwo );
SetParameter(kParam_Three, kDefaultValue_ParamThree );
#if AU_DEBUG_DISPATCHER
mDebugDispatcher = new AUDebugDispatcher (this);
#endif
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Capacitor::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Capacitor::GetParameterValueStrings(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
CFArrayRef * outStrings)
{
return kAudioUnitErr_InvalidProperty;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Capacitor::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Capacitor::GetParameterInfo(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
AudioUnitParameterInfo &outParameterInfo )
{
ComponentResult result = noErr;
outParameterInfo.flags = kAudioUnitParameterFlag_IsWritable
| kAudioUnitParameterFlag_IsReadable;
if (inScope == kAudioUnitScope_Global) {
switch(inParameterID)
{
case kParam_One:
AUBase::FillInParameterName (outParameterInfo, kParameterOneName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.minValue = 0.0;
outParameterInfo.maxValue = 1.0;
outParameterInfo.defaultValue = kDefaultValue_ParamOne;
break;
case kParam_Two:
AUBase::FillInParameterName (outParameterInfo, kParameterTwoName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.minValue = 0.0;
outParameterInfo.maxValue = 1.0;
outParameterInfo.defaultValue = kDefaultValue_ParamTwo;
break;
case kParam_Three:
AUBase::FillInParameterName (outParameterInfo, kParameterThreeName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.minValue = 0.0;
outParameterInfo.maxValue = 1.0;
outParameterInfo.defaultValue = kDefaultValue_ParamThree;
break;
default:
result = kAudioUnitErr_InvalidParameter;
break;
}
} else {
result = kAudioUnitErr_InvalidParameter;
}
return result;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Capacitor::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Capacitor::GetPropertyInfo (AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
UInt32 & outDataSize,
Boolean & outWritable)
{
return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Capacitor::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Capacitor::GetProperty( AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
void * outData )
{
return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}
// Capacitor::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Capacitor::Initialize()
{
ComponentResult result = AUEffectBase::Initialize();
if (result == noErr)
Reset(kAudioUnitScope_Global, 0);
return result;
}
#pragma mark ____CapacitorEffectKernel
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Capacitor::CapacitorKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void Capacitor::CapacitorKernel::Reset()
{
iirHighpassA = 0.0;
iirHighpassB = 0.0;
iirHighpassC = 0.0;
iirHighpassD = 0.0;
iirHighpassE = 0.0;
iirHighpassF = 0.0;
iirLowpassA = 0.0;
iirLowpassB = 0.0;
iirLowpassC = 0.0;
iirLowpassD = 0.0;
iirLowpassE = 0.0;
iirLowpassF = 0.0;
count = 0;
lowpassChase = 0.0;
highpassChase = 0.0;
wetChase = 0.0;
lowpassAmount = 1.0;
highpassAmount = 0.0;
wet = 1.0;
lastLowpass = 1000.0;
lastHighpass = 1000.0;
lastWet = 1000.0;
fpNShape = 0.0;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Capacitor::CapacitorKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void Capacitor::CapacitorKernel::Process( const Float32 *inSourceP,
Float32 *inDestP,
UInt32 inFramesToProcess,
UInt32 inNumChannels,
bool &ioSilence )
{
UInt32 nSampleFrames = inFramesToProcess;
const Float32 *sourceP = inSourceP;
Float32 *destP = inDestP;
lowpassChase = pow(GetParameter( kParam_One ),2);
highpassChase = pow(GetParameter( kParam_Two ),2);
wetChase = GetParameter( kParam_Three );
//should not scale with sample rate, because values reaching 1 are important
//to its ability to bypass when set to max
Float64 lowpassSpeed = 300 / (fabs( lastLowpass - lowpassChase)+1.0);
Float64 highpassSpeed = 300 / (fabs( lastHighpass - highpassChase)+1.0);
Float64 wetSpeed = 300 / (fabs( lastWet - wetChase)+1.0);
lastLowpass = lowpassChase;
lastHighpass = highpassChase;
lastWet = wetChase;
Float64 invLowpass;
Float64 invHighpass;
Float64 dry;
long double inputSample;
Float32 drySample;
while (nSampleFrames-- > 0) {
inputSample = *sourceP;
if (inputSample<1.2e-38 && -inputSample<1.2e-38) {
static int noisesource = 0;
//this declares a variable before anything else is compiled. It won't keep assigning
//it to 0 for every sample, it's as if the declaration doesn't exist in this context,
//but it lets me add this denormalization fix in a single place rather than updating
//it in three different locations. The variable isn't thread-safe but this is only
//a random seed and we can share it with whatever.
noisesource = noisesource % 1700021; noisesource++;
int residue = noisesource * noisesource;
residue = residue % 170003; residue *= residue;
residue = residue % 17011; residue *= residue;
residue = residue % 1709; residue *= residue;
residue = residue % 173; residue *= residue;
residue = residue % 17;
double applyresidue = residue;
applyresidue *= 0.00000001;
applyresidue *= 0.00000001;
inputSample = applyresidue;
//this denormalization routine produces a white noise at -300 dB which the noise
//shaping will interact with to produce a bipolar output, but the noise is actually
//all positive. That should stop any variables from going denormal, and the routine
//only kicks in if digital black is input. As a final touch, if you save to 24-bit
//the silence will return to being digital black again.
}
drySample = inputSample;
lowpassAmount = (((lowpassAmount*lowpassSpeed)+lowpassChase)/(lowpassSpeed + 1.0)); invLowpass = 1.0 - lowpassAmount;
highpassAmount = (((highpassAmount*highpassSpeed)+highpassChase)/(highpassSpeed + 1.0)); invHighpass = 1.0 - highpassAmount;
wet = (((wet*wetSpeed)+wetChase)/(wetSpeed+1.0)); dry = 1.0 - wet;
count++; if (count > 5) count = 0; switch (count)
{
case 0:
iirHighpassA = (iirHighpassA * invHighpass) + (inputSample * highpassAmount); inputSample -= iirHighpassA;
iirLowpassA = (iirLowpassA * invLowpass) + (inputSample * lowpassAmount); inputSample = iirLowpassA;
iirHighpassB = (iirHighpassB * invHighpass) + (inputSample * highpassAmount); inputSample -= iirHighpassB;
iirLowpassB = (iirLowpassB * invLowpass) + (inputSample * lowpassAmount); inputSample = iirLowpassB;
iirHighpassD = (iirHighpassD * invHighpass) + (inputSample * highpassAmount); inputSample -= iirHighpassD;
iirLowpassD = (iirLowpassD * invLowpass) + (inputSample * lowpassAmount); inputSample = iirLowpassD;
break;
case 1:
iirHighpassA = (iirHighpassA * invHighpass) + (inputSample * highpassAmount); inputSample -= iirHighpassA;
iirLowpassA = (iirLowpassA * invLowpass) + (inputSample * lowpassAmount); inputSample = iirLowpassA;
iirHighpassC = (iirHighpassC * invHighpass) + (inputSample * highpassAmount); inputSample -= iirHighpassC;
iirLowpassC = (iirLowpassC * invLowpass) + (inputSample * lowpassAmount); inputSample = iirLowpassC;
iirHighpassE = (iirHighpassE * invHighpass) + (inputSample * highpassAmount); inputSample -= iirHighpassE;
iirLowpassE = (iirLowpassE * invLowpass) + (inputSample * lowpassAmount); inputSample = iirLowpassE;
break;
case 2:
iirHighpassA = (iirHighpassA * invHighpass) + (inputSample * highpassAmount); inputSample -= iirHighpassA;
iirLowpassA = (iirLowpassA * invLowpass) + (inputSample * lowpassAmount); inputSample = iirLowpassA;
iirHighpassB = (iirHighpassB * invHighpass) + (inputSample * highpassAmount); inputSample -= iirHighpassB;
iirLowpassB = (iirLowpassB * invLowpass) + (inputSample * lowpassAmount); inputSample = iirLowpassB;
iirHighpassF = (iirHighpassF * invHighpass) + (inputSample * highpassAmount); inputSample -= iirHighpassF;
iirLowpassF = (iirLowpassF * invLowpass) + (inputSample * lowpassAmount); inputSample = iirLowpassF;
break;
case 3:
iirHighpassA = (iirHighpassA * invHighpass) + (inputSample * highpassAmount); inputSample -= iirHighpassA;
iirLowpassA = (iirLowpassA * invLowpass) + (inputSample * lowpassAmount); inputSample = iirLowpassA;
iirHighpassC = (iirHighpassC * invHighpass) + (inputSample * highpassAmount); inputSample -= iirHighpassC;
iirLowpassC = (iirLowpassC * invLowpass) + (inputSample * lowpassAmount); inputSample = iirLowpassC;
iirHighpassD = (iirHighpassD * invHighpass) + (inputSample * highpassAmount); inputSample -= iirHighpassD;
iirLowpassD = (iirLowpassD * invLowpass) + (inputSample * lowpassAmount); inputSample = iirLowpassD;
break;
case 4:
iirHighpassA = (iirHighpassA * invHighpass) + (inputSample * highpassAmount); inputSample -= iirHighpassA;
iirLowpassA = (iirLowpassA * invLowpass) + (inputSample * lowpassAmount); inputSample = iirLowpassA;
iirHighpassB = (iirHighpassB * invHighpass) + (inputSample * highpassAmount); inputSample -= iirHighpassB;
iirLowpassB = (iirLowpassB * invLowpass) + (inputSample * lowpassAmount); inputSample = iirLowpassB;
iirHighpassE = (iirHighpassE * invHighpass) + (inputSample * highpassAmount); inputSample -= iirHighpassE;
iirLowpassE = (iirLowpassE * invLowpass) + (inputSample * lowpassAmount); inputSample = iirLowpassE;
break;
case 5:
iirHighpassA = (iirHighpassA * invHighpass) + (inputSample * highpassAmount); inputSample -= iirHighpassA;
iirLowpassA = (iirLowpassA * invLowpass) + (inputSample * lowpassAmount); inputSample = iirLowpassA;
iirHighpassC = (iirHighpassC * invHighpass) + (inputSample * highpassAmount); inputSample -= iirHighpassC;
iirLowpassC = (iirLowpassC * invLowpass) + (inputSample * lowpassAmount); inputSample = iirLowpassC;
iirHighpassF = (iirHighpassF * invHighpass) + (inputSample * highpassAmount); inputSample -= iirHighpassF;
iirLowpassF = (iirLowpassF * invLowpass) + (inputSample * lowpassAmount); inputSample = iirLowpassF;
break;
}
//Highpass Filter chunk. This is three poles of IIR highpass, with a 'gearbox' that progressively
//steepens the filter after minimizing artifacts.
inputSample = (drySample * dry) + (inputSample * wet);
//32 bit dither, made small and tidy.
int expon; frexpf((Float32)inputSample, &expon);
long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
inputSample += (dither-fpNShape); fpNShape = dither;
//end 32 bit dither
*destP = inputSample;
sourceP += inNumChannels; destP += inNumChannels;
}
}
