/*
* File: Hermepass.cpp
*
* Version: 1.0
*
* Created: 3/15/17
*
* Copyright: Copyright � 2017 Airwindows, All Rights Reserved
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/*=============================================================================
Hermepass.cpp
=============================================================================*/
#include "Hermepass.h"
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
COMPONENT_ENTRY(Hermepass)
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Hermepass::Hermepass
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Hermepass::Hermepass(AudioUnit component)
: AUEffectBase(component)
{
CreateElements();
Globals()->UseIndexedParameters(kNumberOfParameters);
SetParameter(kParam_One, kDefaultValue_ParamOne );
SetParameter(kParam_Two, kDefaultValue_ParamTwo );
#if AU_DEBUG_DISPATCHER
mDebugDispatcher = new AUDebugDispatcher (this);
#endif
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Hermepass::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Hermepass::GetParameterValueStrings(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
CFArrayRef * outStrings)
{
return kAudioUnitErr_InvalidProperty;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Hermepass::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Hermepass::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;
default:
result = kAudioUnitErr_InvalidParameter;
break;
}
} else {
result = kAudioUnitErr_InvalidParameter;
}
return result;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Hermepass::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Hermepass::GetPropertyInfo (AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
UInt32 & outDataSize,
Boolean & outWritable)
{
return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Hermepass::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Hermepass::GetProperty( AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
void * outData )
{
return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}
// Hermepass::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Hermepass::Initialize()
{
ComponentResult result = AUEffectBase::Initialize();
if (result == noErr)
Reset(kAudioUnitScope_Global, 0);
return result;
}
#pragma mark ____HermepassEffectKernel
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Hermepass::HermepassKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void Hermepass::HermepassKernel::Reset()
{
iirA = 0.0;
iirB = 0.0;
iirC = 0.0;
iirD = 0.0;
iirE = 0.0;
iirF = 0.0;
iirG = 0.0;
iirH = 0.0;
fpNShape = 0.0;
fpFlip = true;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Hermepass::HermepassKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void Hermepass::HermepassKernel::Process( const Float32 *inSourceP,
Float32 *inDestP,
UInt32 inFramesToProcess,
UInt32 inNumChannels,
bool &ioSilence )
{
UInt32 nSampleFrames = inFramesToProcess;
const Float32 *sourceP = inSourceP;
Float32 *destP = inDestP;
long double overallscale = 1.0;
overallscale /= 44100.0;
overallscale *= GetSampleRate();
long double fpOld = 0.618033988749894848204586; //golden ratio!
long double fpNew = 1.0 - fpOld;
Float64 rangescale = 0.1 / overallscale;
Float64 cutoff = pow(GetParameter( kParam_One ),3);
Float64 slope = pow(GetParameter( kParam_Two ),3) * 6.0;
Float64 newA = cutoff * rangescale;
Float64 newB = newA; //other part of interleaved IIR is the same
Float64 newC = cutoff * rangescale; //first extra pole is the same
cutoff = (cutoff * fpOld) + (0.00001 * fpNew);
Float64 newD = cutoff * rangescale;
cutoff = (cutoff * fpOld) + (0.00001 * fpNew);
Float64 newE = cutoff * rangescale;
cutoff = (cutoff * fpOld) + (0.00001 * fpNew);
Float64 newF = cutoff * rangescale;
cutoff = (cutoff * fpOld) + (0.00001 * fpNew);
Float64 newG = cutoff * rangescale;
cutoff = (cutoff * fpOld) + (0.00001 * fpNew);
Float64 newH = cutoff * rangescale;
//converge toward the unvarying fixed cutoff value
Float64 oldA = 1.0 - newA;
Float64 oldB = 1.0 - newB;
Float64 oldC = 1.0 - newC;
Float64 oldD = 1.0 - newD;
Float64 oldE = 1.0 - newE;
Float64 oldF = 1.0 - newF;
Float64 oldG = 1.0 - newG;
Float64 oldH = 1.0 - newH;
Float64 polesC;
Float64 polesD;
Float64 polesE;
Float64 polesF;
Float64 polesG;
Float64 polesH;
polesC = slope; if (slope > 1.0) polesC = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
polesD = slope; if (slope > 1.0) polesD = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
polesE = slope; if (slope > 1.0) polesE = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
polesF = slope; if (slope > 1.0) polesF = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
polesG = slope; if (slope > 1.0) polesG = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
polesH = slope; if (slope > 1.0) polesH = 1.0; slope -= 1.0; if (slope < 0.0) slope = 0.0;
//each one will either be 0.0, the fractional slope value, or 1
long double inputSample;
Float64 tempSample;
Float64 correction;
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.
}
tempSample = inputSample;
if (fpFlip) {
iirA = (iirA * oldA) + (tempSample * newA); tempSample -= iirA; correction = iirA;
} else {
iirB = (iirB * oldB) + (tempSample * newB); tempSample -= iirB; correction = iirB;
}
iirC = (iirC * oldC) + (tempSample * newC); tempSample -= iirC;
iirD = (iirD * oldD) + (tempSample * newD); tempSample -= iirD;
iirE = (iirE * oldE) + (tempSample * newE); tempSample -= iirE;
iirF = (iirF * oldF) + (tempSample * newF); tempSample -= iirF;
iirG = (iirG * oldG) + (tempSample * newG); tempSample -= iirG;
iirH = (iirH * oldH) + (tempSample * newH); tempSample -= iirH;
//set up all the iir filters in case they are used
if (polesC == 1.0) correction += iirC; if (polesC > 0.0 && polesC < 1.0) correction += (iirC * polesC);
if (polesD == 1.0) correction += iirD; if (polesD > 0.0 && polesD < 1.0) correction += (iirD * polesD);
if (polesE == 1.0) correction += iirE; if (polesE > 0.0 && polesE < 1.0) correction += (iirE * polesE);
if (polesF == 1.0) correction += iirF; if (polesF > 0.0 && polesF < 1.0) correction += (iirF * polesF);
if (polesG == 1.0) correction += iirG; if (polesG > 0.0 && polesG < 1.0) correction += (iirG * polesG);
if (polesH == 1.0) correction += iirH; if (polesH > 0.0 && polesH < 1.0) correction += (iirH * polesH);
//each of these are added directly if they're fully engaged,
//multiplied by 0-1 if they are the interpolated one, or skipped if they are beyond the interpolated one.
//the purpose is to do all the math at the floating point exponent nearest to the tiny value in use.
//also, it's formatted that way to easily substitute the next variable: this could be written as a loop
//with everything an array value. However, this makes just as much sense for this few poles.
inputSample -= correction;
fpFlip = !fpFlip;
//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;
}
}
