/*
* File: Tape.cpp
*
* Version: 1.0
*
* Created: 1/21/20
*
* Copyright: Copyright � 2020 Airwindows, All Rights Reserved
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/*=============================================================================
Tape.cpp
=============================================================================*/
#include "Tape.h"
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
COMPONENT_ENTRY(Tape)
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Tape::Tape
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tape::Tape(AudioUnit component)
: AUEffectBase(component)
{
CreateElements();
Globals()->UseIndexedParameters(kNumberOfParameters);
SetParameter(kParam_One, kDefaultValue_ParamOne );
#if AU_DEBUG_DISPATCHER
mDebugDispatcher = new AUDebugDispatcher (this);
#endif
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Tape::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Tape::GetParameterValueStrings(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
CFArrayRef * outStrings)
{
return kAudioUnitErr_InvalidProperty;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Tape::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Tape::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;
default:
result = kAudioUnitErr_InvalidParameter;
break;
}
} else {
result = kAudioUnitErr_InvalidParameter;
}
return result;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Tape::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Tape::GetPropertyInfo (AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
UInt32 & outDataSize,
Boolean & outWritable)
{
return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Tape::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Tape::GetProperty( AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
void * outData )
{
return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}
// Tape::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Tape::Initialize()
{
ComponentResult result = AUEffectBase::Initialize();
if (result == noErr)
Reset(kAudioUnitScope_Global, 0);
return result;
}
#pragma mark ____TapeEffectKernel
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Tape::TapeKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void Tape::TapeKernel::Reset()
{
iirMidRollerA = 0.0;
iirMidRollerB = 0.0;
iirHeadBumpA = 0.0;
iirHeadBumpB = 0.0;
flip = false;
for (int x = 0; x < 9; x++) {biquadA[x] = 0.0;biquadB[x] = 0.0;biquadC[x] = 0.0;biquadD[x] = 0.0;}
lastSample = 0.0;
fpd = 17;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Tape::TapeKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void Tape::TapeKernel::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();
Float64 inputgain = pow(10.0,GetParameter( kParam_One )/20.0);
Float64 HeadBumpFreq = 0.12/overallscale;
Float64 softness = 0.618033988749894848204586;
Float64 RollAmount = (1.0 - softness) / overallscale;
//[0] is frequency: 0.000001 to 0.499999 is near-zero to near-Nyquist
//[1] is resonance, 0.7071 is Butterworth. Also can't be zero
biquadA[0] = biquadB[0] = 0.0072/overallscale;
biquadA[1] = biquadB[1] = 0.0009;
double K = tan(M_PI * biquadB[0]);
double norm = 1.0 / (1.0 + K / biquadB[1] + K * K);
biquadA[2] = biquadB[2] = K / biquadB[1] * norm;
biquadA[4] = biquadB[4] = -biquadB[2];
biquadA[5] = biquadB[5] = 2.0 * (K * K - 1.0) * norm;
biquadA[6] = biquadB[6] = (1.0 - K / biquadB[1] + K * K) * norm;
biquadC[0] = biquadD[0] = 0.032/overallscale;
biquadC[1] = biquadD[1] = 0.0007;
K = tan(M_PI * biquadD[0]);
norm = 1.0 / (1.0 + K / biquadD[1] + K * K);
biquadC[2] = biquadD[2] = K / biquadD[1] * norm;
biquadC[4] = biquadD[4] = -biquadD[2];
biquadC[5] = biquadD[5] = 2.0 * (K * K - 1.0) * norm;
biquadC[6] = biquadD[6] = (1.0 - K / biquadD[1] + K * K) * norm;
while (nSampleFrames-- > 0) {
long double inputSample = *sourceP;
if (fabs(inputSample)<1.18e-37) inputSample = fpd * 1.18e-37;
long double drySample = inputSample;
long double HighsSample = 0.0;
long double NonHighsSample = 0.0;
long double tempSample;
if (flip)
{
iirMidRollerA = (iirMidRollerA * (1.0 - RollAmount)) + (inputSample * RollAmount);
HighsSample = inputSample - iirMidRollerA;
NonHighsSample = iirMidRollerA;
iirHeadBumpA += (inputSample * 0.05);
iirHeadBumpA -= (iirHeadBumpA * iirHeadBumpA * iirHeadBumpA * HeadBumpFreq);
iirHeadBumpA = sin(iirHeadBumpA);
tempSample = (iirHeadBumpA * biquadA[2]) + biquadA[7];
biquadA[7] = (iirHeadBumpA * biquadA[3]) - (tempSample * biquadA[5]) + biquadA[8];
biquadA[8] = (iirHeadBumpA * biquadA[4]) - (tempSample * biquadA[6]);
iirHeadBumpA = tempSample; //interleaved biquad
if (iirHeadBumpA > 1.0) iirHeadBumpA = 1.0;
if (iirHeadBumpA < -1.0) iirHeadBumpA = -1.0;
iirHeadBumpA = asin(iirHeadBumpA);
inputSample = sin(inputSample);
tempSample = (inputSample * biquadC[2]) + biquadC[7];
biquadC[7] = (inputSample * biquadC[3]) - (tempSample * biquadC[5]) + biquadC[8];
biquadC[8] = (inputSample * biquadC[4]) - (tempSample * biquadC[6]);
inputSample = tempSample; //interleaved biquad
if (inputSample > 1.0) inputSample = 1.0;
if (inputSample < -1.0) inputSample = -1.0;
inputSample = asin(inputSample);
} else {
iirMidRollerB = (iirMidRollerB * (1.0 - RollAmount)) + (inputSample * RollAmount);
HighsSample = inputSample - iirMidRollerB;
NonHighsSample = iirMidRollerB;
iirHeadBumpB += (inputSample * 0.05);
iirHeadBumpB -= (iirHeadBumpB * iirHeadBumpB * iirHeadBumpB * HeadBumpFreq);
iirHeadBumpB = sin(iirHeadBumpB);
tempSample = (iirHeadBumpB * biquadB[2]) + biquadB[7];
biquadB[7] = (iirHeadBumpB * biquadB[3]) - (tempSample * biquadB[5]) + biquadB[8];
biquadB[8] = (iirHeadBumpB * biquadB[4]) - (tempSample * biquadB[6]);
iirHeadBumpB = tempSample; //interleaved biquad
if (iirHeadBumpB > 1.0) iirHeadBumpB = 1.0;
if (iirHeadBumpB < -1.0) iirHeadBumpB = -1.0;
iirHeadBumpB = asin(iirHeadBumpB);
inputSample = sin(inputSample);
tempSample = (inputSample * biquadD[2]) + biquadD[7];
biquadD[7] = (inputSample * biquadD[3]) - (tempSample * biquadD[5]) + biquadD[8];
biquadD[8] = (inputSample * biquadD[4]) - (tempSample * biquadD[6]);
inputSample = tempSample; //interleaved biquad
if (inputSample > 1.0) inputSample = 1.0;
if (inputSample < -1.0) inputSample = -1.0;
inputSample = asin(inputSample);
}
flip = !flip;
long double groundSample = drySample - inputSample; //set up UnBox
if (inputgain != 1.0) {
inputSample *= inputgain;
} //gain boost inside UnBox: do not boost fringe audio
long double applySoften = fabs(HighsSample)*1.57079633;
if (applySoften > 1.57079633) applySoften = 1.57079633;
applySoften = 1-cos(applySoften);
if (HighsSample > 0) inputSample -= applySoften;
if (HighsSample < 0) inputSample += applySoften;
//apply Soften depending on polarity
if (inputSample > 1.2533141373155) inputSample = 1.2533141373155;
if (inputSample < -1.2533141373155) inputSample = -1.2533141373155;
//clip to 1.2533141373155 to reach maximum output
inputSample = sin(inputSample * fabs(inputSample)) / ((inputSample == 0.0) ?1:fabs(inputSample));
//Spiral, for cleanest most optimal tape effect
Float64 suppress = (1.0-fabs(inputSample)) * 0.00013;
if (iirHeadBumpA > suppress) iirHeadBumpA -= suppress;
if (iirHeadBumpA < -suppress) iirHeadBumpA += suppress;
if (iirHeadBumpB > suppress) iirHeadBumpB -= suppress;
if (iirHeadBumpB < -suppress) iirHeadBumpB += suppress;
//restrain resonant quality of head bump algorithm
inputSample += groundSample; //apply UnBox processing
inputSample += ((iirHeadBumpA + iirHeadBumpB) * 0.1);//and head bump
if (lastSample >= 0.99)
{
if (inputSample < 0.99) lastSample = ((0.99*softness) + (inputSample * (1.0-softness)));
else lastSample = 0.99;
}
if (lastSample <= -0.99)
{
if (inputSample > -0.99) lastSample = ((-0.99*softness) + (inputSample * (1.0-softness)));
else lastSample = -0.99;
}
if (inputSample > 0.99)
{
if (lastSample < 0.99) inputSample = ((0.99*softness) + (lastSample * (1.0-softness)));
else inputSample = 0.99;
}
if (inputSample < -0.99)
{
if (lastSample > -0.99) inputSample = ((-0.99*softness) + (lastSample * (1.0-softness)));
else inputSample = -0.99;
}
lastSample = inputSample;
if (inputSample > 0.99) inputSample = 0.99;
if (inputSample < -0.99) inputSample = -0.99;
//final iron bar
//begin 32 bit floating point dither
int expon; frexpf((float)inputSample, &expon);
fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
inputSample += ((double(fpd)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
//end 32 bit floating point dither
*destP = inputSample;
sourceP += inNumChannels; destP += inNumChannels;
}
}
