/*
* File: Compresaturator.cpp
*
* Version: 1.0
*
* Created: 11/30/18
*
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/*=============================================================================
Compresaturator.cpp
=============================================================================*/
#include "Compresaturator.h"
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
COMPONENT_ENTRY(Compresaturator)
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Compresaturator::Compresaturator
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Compresaturator::Compresaturator(AudioUnit component)
: AUEffectBase(component)
{
CreateElements();
Globals()->UseIndexedParameters(kNumberOfParameters);
SetParameter(kParam_One, kDefaultValue_ParamOne );
SetParameter(kParam_Two, kDefaultValue_ParamTwo );
SetParameter(kParam_Three, kDefaultValue_ParamThree );
SetParameter(kParam_Four, kDefaultValue_ParamFour );
SetParameter(kParam_Five, kDefaultValue_ParamFive );
#if AU_DEBUG_DISPATCHER
mDebugDispatcher = new AUDebugDispatcher (this);
#endif
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Compresaturator::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Compresaturator::GetParameterValueStrings(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
CFArrayRef * outStrings)
{
return kAudioUnitErr_InvalidProperty;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Compresaturator::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Compresaturator::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_Decibels;
outParameterInfo.minValue = -12.0;
outParameterInfo.maxValue = 12.0;
outParameterInfo.defaultValue = kDefaultValue_ParamOne;
break;
case kParam_Two:
AUBase::FillInParameterName (outParameterInfo, kParameterTwoName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Percent;
outParameterInfo.minValue = 0.0;
outParameterInfo.maxValue = 100.0;
outParameterInfo.defaultValue = kDefaultValue_ParamTwo;
break;
case kParam_Three:
AUBase::FillInParameterName (outParameterInfo, kParameterThreeName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_CustomUnit;
outParameterInfo.flags |= kAudioUnitParameterFlag_DisplayLogarithmic;
outParameterInfo.unitName = kParameterThreeUnit;
outParameterInfo.minValue = 50.0;
outParameterInfo.maxValue = 5000.0;
outParameterInfo.defaultValue = kDefaultValue_ParamThree;
break;
case kParam_Four:
AUBase::FillInParameterName (outParameterInfo, kParameterFourName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.minValue = 0.0;
outParameterInfo.maxValue = 1.0;
outParameterInfo.defaultValue = kDefaultValue_ParamFour;
break;
case kParam_Five:
AUBase::FillInParameterName (outParameterInfo, kParameterFiveName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.minValue = 0.0;
outParameterInfo.maxValue = 1.0;
outParameterInfo.defaultValue = kDefaultValue_ParamFive;
break;
default:
result = kAudioUnitErr_InvalidParameter;
break;
}
} else {
result = kAudioUnitErr_InvalidParameter;
}
return result;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Compresaturator::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Compresaturator::GetPropertyInfo (AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
UInt32 & outDataSize,
Boolean & outWritable)
{
return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Compresaturator::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Compresaturator::GetProperty( AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
void * outData )
{
return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}
// Compresaturator::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Compresaturator::Initialize()
{
ComponentResult result = AUEffectBase::Initialize();
if (result == noErr)
Reset(kAudioUnitScope_Global, 0);
return result;
}
#pragma mark ____CompresaturatorEffectKernel
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Compresaturator::CompresaturatorKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void Compresaturator::CompresaturatorKernel::Reset()
{
for(int count = 0; count < 10990; count++) {d[count] = 0.0;}
dCount = 0;
lastWidth = 500;
padFactor = 0;
fpd = 17;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Compresaturator::CompresaturatorKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void Compresaturator::CompresaturatorKernel::Process( const Float32 *inSourceP,
Float32 *inDestP,
UInt32 inFramesToProcess,
UInt32 inNumChannels,
bool &ioSilence )
{
UInt32 nSampleFrames = inFramesToProcess;
const Float32 *sourceP = inSourceP;
Float32 *destP = inDestP;
Float64 inputgain = pow(10.0,GetParameter( kParam_One )/20.0);
Float64 satComp = GetParameter( kParam_Two ) / 50;
int widestRange = GetParameter( kParam_Three );
satComp += (((Float64)widestRange/3000.0)*satComp);
//set the max wideness of comp zone, minimum range boosted (too much?)
Float64 output = GetParameter( kParam_Four );
Float64 wet = GetParameter( kParam_Five );
while (nSampleFrames-- > 0) {
long double inputSample = *sourceP;
long double temp = inputSample;
static int noisesource = 0;
int residue;
double applyresidue;
noisesource = noisesource % 1700021; noisesource++;
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;
applyresidue = residue;
applyresidue *= 0.00000001;
applyresidue *= 0.00000001;
inputSample += applyresidue;
if (inputSample<1.2e-38 && -inputSample<1.2e-38) {
inputSample -= applyresidue;
}
//for live air, we always apply the dither noise. Then, if our result is
//effectively digital black, we'll subtract it again. We want a 'air' hiss
long double drySample = inputSample;
if (dCount < 1 || dCount > 5000) {dCount = 5000;}
Float64 variSpeed = 1.0 + ((padFactor/lastWidth)*satComp);
if (variSpeed < 1.0) variSpeed = 1.0;
Float64 totalgain = inputgain / variSpeed;
if (totalgain != 1.0) {
inputSample *= totalgain;
if (totalgain < 1.0) {
temp *= totalgain;
//no boosting beyond unity please
}
}
long double bridgerectifier = fabs(inputSample);
Float64 overspill = 0;
int targetWidth = widestRange;
//we now have defaults and an absolute input value to work with
if (bridgerectifier < 0.01) padFactor *= 0.9999;
//in silences we bring back padFactor if it got out of hand
if (bridgerectifier > 1.57079633) {
bridgerectifier = 1.57079633;
targetWidth = 8;
}
//if our output's gone beyond saturating to distorting, we begin chasing the
//buffer size smaller. Anytime we don't have that, we expand (smoothest sound, only adding to an increasingly subdivided buffer)
bridgerectifier = sin(bridgerectifier);
if (inputSample > 0) {
inputSample = bridgerectifier;
overspill = temp - bridgerectifier;
}
if (inputSample < 0) {
inputSample = -bridgerectifier;
overspill = (-temp) - bridgerectifier;
}
//drive section
d[dCount + 5000] = d[dCount] = overspill * satComp;
//we now have a big buffer to draw from, which is always positive amount of overspill
dCount--;
padFactor += d[dCount];
Float64 randy = (rand()/(double)RAND_MAX);
if ((targetWidth*randy) > lastWidth) {
//we are expanding the buffer so we don't remove this trailing sample
lastWidth += 1;
} else {
padFactor -= d[dCount+lastWidth];
//zero change, or target is smaller and we are shrinking
if (targetWidth < lastWidth) {
lastWidth -= 1;
if (lastWidth < 2) lastWidth = 2;
//sanity check as randy can give us target zero
padFactor -= d[dCount+lastWidth];
}
}
//variable attack/release speed more rapid as comp intensity increases
//implemented in a way where we're repeatedly not altering the buffer as it expands, which makes the comp artifacts smoother
if (padFactor < 0) padFactor = 0;
if (output < 1.0) {
inputSample *= output;
}
if (wet < 1.0) {
inputSample = (inputSample * wet) + (drySample * (1.0-wet));
}
//begin 32 bit floating point dither
int expon; frexpf((float)inputSample, &expon);
fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
inputSample += static_cast<int32_t>(fpd) * 5.960464655174751e-36L * pow(2,expon+62);
//end 32 bit floating point dither
*destP = inputSample;
sourceP += inNumChannels; destP += inNumChannels;
}
}
