/*
* File: TapeDelay.cpp
*
* Version: 1.0
*
* Created: 11/29/18
*
* Copyright: Copyright � 2018 Airwindows, All Rights Reserved
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/*=============================================================================
TapeDelay.cpp
=============================================================================*/
#include "TapeDelay.h"
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
COMPONENT_ENTRY(TapeDelay)
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// TapeDelay::TapeDelay
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
TapeDelay::TapeDelay(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 );
SetParameter(kParam_Six, kDefaultValue_ParamSix );
#if AU_DEBUG_DISPATCHER
mDebugDispatcher = new AUDebugDispatcher (this);
#endif
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// TapeDelay::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult TapeDelay::GetParameterValueStrings(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
CFArrayRef * outStrings)
{
return kAudioUnitErr_InvalidProperty;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// TapeDelay::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult TapeDelay::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;
outParameterInfo.defaultValue = kDefaultValue_ParamOne;
break;
case kParam_Two:
AUBase::FillInParameterName (outParameterInfo, kParameterTwoName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.minValue = 0.0;
outParameterInfo.maxValue = 1;
outParameterInfo.defaultValue = kDefaultValue_ParamTwo;
break;
case kParam_Three:
AUBase::FillInParameterName (outParameterInfo, kParameterThreeName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.minValue = 0.0;
outParameterInfo.maxValue = 1;
outParameterInfo.defaultValue = kDefaultValue_ParamThree;
break;
case kParam_Four:
AUBase::FillInParameterName (outParameterInfo, kParameterFourName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.minValue = 0.0;
outParameterInfo.maxValue = 1;
outParameterInfo.defaultValue = kDefaultValue_ParamFour;
break;
case kParam_Five:
AUBase::FillInParameterName (outParameterInfo, kParameterFiveName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.minValue = -1.0;
outParameterInfo.maxValue = 1.0;
outParameterInfo.defaultValue = kDefaultValue_ParamFive;
break;
case kParam_Six:
AUBase::FillInParameterName (outParameterInfo, kParameterSixName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_CustomUnit;
outParameterInfo.unitName = kParameterSixUnit;
outParameterInfo.minValue = 3;
outParameterInfo.maxValue = 32;
outParameterInfo.defaultValue = kDefaultValue_ParamSix;
break;
default:
result = kAudioUnitErr_InvalidParameter;
break;
}
} else {
result = kAudioUnitErr_InvalidParameter;
}
return result;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// TapeDelay::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult TapeDelay::GetPropertyInfo (AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
UInt32 & outDataSize,
Boolean & outWritable)
{
return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// TapeDelay::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult TapeDelay::GetProperty( AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
void * outData )
{
return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}
// TapeDelay::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult TapeDelay::Initialize()
{
ComponentResult result = AUEffectBase::Initialize();
if (result == noErr)
Reset(kAudioUnitScope_Global, 0);
return result;
}
#pragma mark ____TapeDelayEffectKernel
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// TapeDelay::TapeDelayKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void TapeDelay::TapeDelayKernel::Reset()
{
for(int count = 0; count < 257; count++) {p[count] = 0;}
for(delay = 0; delay < 44100; delay++) {d[delay] = 0.0;}
maxdelay = 0;
delay = 0;
gcount = 0;
chase = 0;
fpNShape = 0.0;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// TapeDelay::TapeDelayKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void TapeDelay::TapeDelayKernel::Process( const Float32 *inSourceP,
Float32 *inDestP,
UInt32 inFramesToProcess,
UInt32 inNumChannels,
bool &ioSilence )
{
UInt32 nSampleFrames = inFramesToProcess;
const Float32 *sourceP = inSourceP;
Float32 *destP = inDestP;
Float64 dry = pow(GetParameter( kParam_One ),2);
Float64 wet = pow(GetParameter( kParam_Two ),2);
int targetdelay = (int)(44000*GetParameter( kParam_Three ));
Float64 feedback = (GetParameter( kParam_Four )*1.3);
Float64 leanfat = GetParameter( kParam_Five );
Float64 fatwet = fabs(leanfat);
Float64 storedelay;
int fatness = (int)GetParameter( kParam_Six );
Float64 sum = 0.0;
Float64 floattotal = 0.0;
SInt32 sumtotal = 0;
SInt32 count;
while (nSampleFrames-- > 0) {
long double inputSample = *sourceP;
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
if (gcount < 0 || gcount > 128) {gcount = 128;}
count = gcount;
if (delay < 0 || delay > maxdelay) {delay = maxdelay;}
sum = inputSample + (d[delay]*feedback);
p[count+128] = p[count] = sumtotal = (SInt32)(sum*8388608.0);
switch (fatness)
{
case 32: sumtotal += p[count+127]; //note NO break statement.
case 31: sumtotal += p[count+113]; //This jumps to the relevant tap
case 30: sumtotal += p[count+109]; //and then includes all smaller taps.
case 29: sumtotal += p[count+107];
case 28: sumtotal += p[count+103];
case 27: sumtotal += p[count+101];
case 26: sumtotal += p[count+97];
case 25: sumtotal += p[count+89];
case 24: sumtotal += p[count+83];
case 23: sumtotal += p[count+79];
case 22: sumtotal += p[count+73];
case 21: sumtotal += p[count+71];
case 20: sumtotal += p[count+67];
case 19: sumtotal += p[count+61];
case 18: sumtotal += p[count+59];
case 17: sumtotal += p[count+53];
case 16: sumtotal += p[count+47];
case 15: sumtotal += p[count+43];
case 14: sumtotal += p[count+41];
case 13: sumtotal += p[count+37];
case 12: sumtotal += p[count+31];
case 11: sumtotal += p[count+29];
case 10: sumtotal += p[count+23];
case 9: sumtotal += p[count+19];
case 8: sumtotal += p[count+17];
case 7: sumtotal += p[count+13];
case 6: sumtotal += p[count+11];
case 5: sumtotal += p[count+7];
case 4: sumtotal += p[count+5];
case 3: sumtotal += p[count+3];
case 2: sumtotal += p[count+2];
case 1: sumtotal += p[count+1];
}
floattotal = (Float64)(sumtotal/fatness+1);
floattotal /= 8388608.0;
floattotal *= fatwet;
if (leanfat < 0) {storedelay = sum-floattotal;}
else {storedelay = (sum * (1-fatwet))+floattotal;}
chase += abs(maxdelay - targetdelay);
if (chase > 9000)
{
if (maxdelay > targetdelay) {d[delay] = storedelay; maxdelay -= 1; delay -= 1; if (delay < 0) {delay = maxdelay;} d[delay] = storedelay;}
if (maxdelay < targetdelay) {maxdelay += 1; delay += 1; if (delay > maxdelay) {delay = 0;} d[delay] = storedelay;}
chase = 0;
}
else
{
d[delay] = storedelay;
}
gcount--;
delay--;
if (delay < 0 || delay > maxdelay) {delay = maxdelay;}
//yes this is a second bounds check. it's cheap, check EVERY time
inputSample = (inputSample * dry) + (d[delay] * 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;
}
}
