/*
* File: BitGlitter.cpp
*
* Version: 1.0
*
* Created: 7/15/12
*
* Copyright: Copyright � 2012 Airwindows, All Rights Reserved
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/*=============================================================================
BitGlitter.cpp
=============================================================================*/
#include "BitGlitter.h"
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
COMPONENT_ENTRY(BitGlitter)
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BitGlitter::BitGlitter
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BitGlitter::BitGlitter(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 );
#if AU_DEBUG_DISPATCHER
mDebugDispatcher = new AUDebugDispatcher (this);
#endif
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BitGlitter::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BitGlitter::GetParameterValueStrings(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
CFArrayRef * outStrings)
{
return kAudioUnitErr_InvalidProperty;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BitGlitter::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BitGlitter::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 = -18.0;
outParameterInfo.maxValue = 18.0;
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 = -18.0;
outParameterInfo.maxValue = 18.0;
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;
default:
result = kAudioUnitErr_InvalidParameter;
break;
}
} else {
result = kAudioUnitErr_InvalidParameter;
}
return result;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BitGlitter::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BitGlitter::GetPropertyInfo (AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
UInt32 & outDataSize,
Boolean & outWritable)
{
return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BitGlitter::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BitGlitter::GetProperty( AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
void * outData )
{
return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}
// BitGlitter::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BitGlitter::Initialize()
{
ComponentResult result = AUEffectBase::Initialize();
if (result == noErr)
Reset(kAudioUnitScope_Global, 0);
return result;
}
#pragma mark ____BitGlitterEffectKernel
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BitGlitter::BitGlitterKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void BitGlitter::BitGlitterKernel::Reset()
{
ataLastSample = 0.0;
ataHalfwaySample = 0.0;
lastSample = 0.0;
heldSampleA = 0.0;
positionA = 0.0;
heldSampleB = 0.0;
positionB = 0.0;
lastOutputSample = 0.0;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BitGlitter::BitGlitterKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void BitGlitter::BitGlitterKernel::Process( const Float32 *inSourceP,
Float32 *inDestP,
UInt32 inFramesToProcess,
UInt32 inNumChannels,
bool &ioSilence )
{
UInt32 nSampleFrames = inFramesToProcess;
const Float32 *sourceP = inSourceP;
Float32 *destP = inDestP;
Float64 overallscale = 1.0;
overallscale /= 44100.0;
overallscale *= GetSampleRate();
Float64 factor = GetParameter( kParam_Two )+1.0;
factor = pow(factor,7)+2.0;
int divvy = (int)(factor*overallscale);
Float64 rateA = 1.0 / divvy;
Float64 rezA = 0.0016666666666667; //looks to be a fixed bitcrush
Float64 rateB = 1.61803398875 / divvy;
Float64 rezB = 0.0026666666666667; //looks to be a fixed bitcrush
Float64 offset;
Float64 ingain = pow(10.0,GetParameter( kParam_One )/14.0); //add adjustment factor
Float64 outgain = pow(10.0,GetParameter( kParam_Three )/14.0); //add adjustment factor
Float64 wet = GetParameter( kParam_Four );
while (nSampleFrames-- > 0) {
long double inputSample = *sourceP;
long double drySample = inputSample;
//first, the distortion section
inputSample *= ingain;
if (inputSample > 1.0) inputSample = 1.0;
if (inputSample < -1.0) inputSample = -1.0;
inputSample *= 1.2533141373155;
//clip to 1.2533141373155 to reach maximum output
inputSample = sin(inputSample * fabs(inputSample)) / ((inputSample == 0.0) ?1:fabs(inputSample));
ataDrySample = inputSample;
ataHalfwaySample = (inputSample + ataLastSample ) / 2.0;
ataLastSample = inputSample;
//setting up crude oversampling
//begin raw sample
positionA += rateA;
long double outputSample = heldSampleA;
if (positionA > 1.0)
{
positionA -= 1.0;
heldSampleA = (lastSample * positionA) + (inputSample * (1-positionA));
outputSample = (outputSample * 0.5) + (heldSampleA * 0.5);
//softens the edge of the derez
}
if (outputSample > 0)
{
offset = outputSample;
while (offset > 0) {offset -= rezA;}
outputSample -= offset;
//it's below 0 so subtracting adds the remainder
}
if (outputSample < 0)
{
offset = outputSample;
while (offset < 0) {offset += rezA;}
outputSample -= offset;
//it's above 0 so subtracting subtracts the remainder
}
outputSample *= (1.0 - rezA);
if (fabs(outputSample) < rezA) outputSample = 0.0;
inputSample = outputSample;
//end raw sample
//begin interpolated sample
positionB += rateB;
outputSample = heldSampleB;
if (positionB > 1.0)
{
positionB -= 1.0;
heldSampleB = (lastSample * positionB) + (ataHalfwaySample * (1-positionB));
outputSample = (outputSample * 0.5) + (heldSampleB * 0.5);
//softens the edge of the derez
}
if (outputSample > 0)
{
offset = outputSample;
while (offset > 0) {offset -= rezB;}
outputSample -= offset;
//it's below 0 so subtracting adds the remainder
}
if (outputSample < 0)
{
offset = outputSample;
while (offset < 0) {offset += rezB;}
outputSample -= offset;
//it's above 0 so subtracting subtracts the remainder
}
outputSample *= (1.0 - rezB);
if (fabs(outputSample) < rezB) outputSample = 0.0;
ataHalfwaySample = outputSample;
//end interpolated sample
inputSample += ataHalfwaySample;
inputSample /= 2.0;
//plain old blend the two
outputSample = (inputSample * (1.0-(wet/2))) + (lastOutputSample*(wet/2));
//darken to extent of wet in wet/dry, maximum 50%
lastOutputSample = inputSample;
outputSample *= outgain;
if (wet < 1.0) {
outputSample = (drySample * (1.0-wet)) + (outputSample * wet);
}
*destP = outputSample;
sourceP += inNumChannels; destP += inNumChannels;
}
}
