/*
* File: Biquad2.cpp
*
* Version: 1.0
*
* Created: 8/29/19
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/*=============================================================================
Biquad2.cpp
=============================================================================*/
#include "Biquad2.h"
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
COMPONENT_ENTRY(Biquad2)
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Biquad2::Biquad2
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Biquad2::Biquad2(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
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Biquad2::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Biquad2::GetParameterValueStrings(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
CFArrayRef * outStrings)
{
return kAudioUnitErr_InvalidProperty;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Biquad2::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Biquad2::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_Indexed;
outParameterInfo.minValue = 1;
outParameterInfo.maxValue = 4;
outParameterInfo.defaultValue = kDefaultValue_ParamOne;
break;
case kParam_Two:
AUBase::FillInParameterName (outParameterInfo, kParameterTwoName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.flags |= kAudioUnitParameterFlag_DisplayLogarithmic;
outParameterInfo.minValue = 0.003;
outParameterInfo.maxValue = 1.0;
outParameterInfo.defaultValue = kDefaultValue_ParamTwo;
break;
case kParam_Three:
AUBase::FillInParameterName (outParameterInfo, kParameterThreeName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.flags |= kAudioUnitParameterFlag_DisplayLogarithmic;
outParameterInfo.minValue = 1.0;
outParameterInfo.maxValue = 50.0;
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 = -1.0;
outParameterInfo.maxValue = 1.0;
outParameterInfo.defaultValue = kDefaultValue_ParamFive;
break;
default:
result = kAudioUnitErr_InvalidParameter;
break;
}
} else {
result = kAudioUnitErr_InvalidParameter;
}
return result;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Biquad2::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Biquad2::GetPropertyInfo (AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
UInt32 & outDataSize,
Boolean & outWritable)
{
return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Biquad2::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Biquad2::GetProperty( AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
void * outData )
{
return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}
// Biquad2::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Biquad2::Initialize()
{
ComponentResult result = AUEffectBase::Initialize();
if (result == noErr)
Reset(kAudioUnitScope_Global, 0);
return result;
}
#pragma mark ____Biquad2EffectKernel
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Biquad2::Biquad2Kernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void Biquad2::Biquad2Kernel::Reset()
{
for (int x = 0; x < 11; x++) {biquad[x] = 0.0; b[x] = 0.0; f[x] = 0.0;}
frequencychase = 0.0015;
resonancechase = 0.001;
outputchase = 1.0;
wetchase = 1.0;
frequencysetting = -1.0;
resonancesetting = -1.0;
outputsetting = -1.0;
wetsetting = -2.0; //-1.0 is a possible setting here and this forces an update on chasespeed
chasespeed = 500.0;
fpd = 17;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Biquad2::Biquad2Kernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void Biquad2::Biquad2Kernel::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();
int type = GetParameter( kParam_One);
Float64 average = GetParameter( kParam_Two );
Float64 frequencytarget = average*0.39; //biquad[0], goes to 1.0
frequencytarget /= overallscale;
if (frequencytarget < 0.0015/overallscale) frequencytarget = 0.0015/overallscale;
Float64 resonancetarget = GetParameter( kParam_Three ); //biquad[1], goes to 50.0
if (resonancetarget < 1.0) resonancetarget = 1.0;
Float64 outputtarget = GetParameter( kParam_Four ); //scaled to res
if (type < 3) outputtarget /= sqrt(resonancetarget);
Float64 wettarget = GetParameter( kParam_Five ); //wet, goes -1.0 to 1.0
//biquad contains these values:
//[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
//[2] is a0 but you need distinct ones for additional biquad instances so it's here
//[3] is a1 but you need distinct ones for additional biquad instances so it's here
//[4] is a2 but you need distinct ones for additional biquad instances so it's here
//[5] is b1 but you need distinct ones for additional biquad instances so it's here
//[6] is b2 but you need distinct ones for additional biquad instances so it's here
//[7] is a stored delayed sample (freq and res are stored so you can move them sample by sample)
//[8] is a stored delayed sample (you have to include the coefficient making code if you do that)
//[9] is a stored delayed sample (you have to include the coefficient making code if you do that)
//[10] is a stored delayed sample (you have to include the coefficient making code if you do that)
Float64 K = tan(M_PI * biquad[0]);
Float64 norm = 1.0 / (1.0 + K / biquad[1] + K * K);
//finished setting up biquad
average = (1.0-average)*10.0; //max taps is 10, and low settings use more
if (type == 1 || type == 3) average = 1.0;
Float64 gain = average;
if (gain > 1.0) {f[0] = 1.0; gain -= 1.0;} else {f[0] = gain; gain = 0.0;}
if (gain > 1.0) {f[1] = 1.0; gain -= 1.0;} else {f[1] = gain; gain = 0.0;}
if (gain > 1.0) {f[2] = 1.0; gain -= 1.0;} else {f[2] = gain; gain = 0.0;}
if (gain > 1.0) {f[3] = 1.0; gain -= 1.0;} else {f[3] = gain; gain = 0.0;}
if (gain > 1.0) {f[4] = 1.0; gain -= 1.0;} else {f[4] = gain; gain = 0.0;}
if (gain > 1.0) {f[5] = 1.0; gain -= 1.0;} else {f[5] = gain; gain = 0.0;}
if (gain > 1.0) {f[6] = 1.0; gain -= 1.0;} else {f[6] = gain; gain = 0.0;}
if (gain > 1.0) {f[7] = 1.0; gain -= 1.0;} else {f[7] = gain; gain = 0.0;}
if (gain > 1.0) {f[8] = 1.0; gain -= 1.0;} else {f[8] = gain; gain = 0.0;}
if (gain > 1.0) {f[9] = 1.0; gain -= 1.0;} else {f[9] = gain; gain = 0.0;}
//there, now we have a neat little moving average with remainders
if (average < 1.0) average = 1.0;
f[0] /= average;
f[1] /= average;
f[2] /= average;
f[3] /= average;
f[4] /= average;
f[5] /= average;
f[6] /= average;
f[7] /= average;
f[8] /= average;
f[9] /= average;
//and now it's neatly scaled, too
//finished setting up average
while (nSampleFrames-- > 0) {
long double inputSample = *sourceP;
if (fabs(inputSample)<1.18e-37) inputSample = fpd * 1.18e-37;
long double drySample = *sourceP;
Float64 chasespeed = 50000;
if (frequencychase < frequencytarget) chasespeed = 500000;
chasespeed /= resonancechase;
chasespeed *= overallscale;
frequencychase = (((frequencychase*chasespeed)+frequencytarget)/(chasespeed+1.0));
Float64 fasterchase = 1000 * overallscale;
resonancechase = (((resonancechase*fasterchase)+resonancetarget)/(fasterchase+1.0));
outputchase = (((outputchase*fasterchase)+outputtarget)/(fasterchase+1.0));
wetchase = (((wetchase*fasterchase)+wettarget)/(fasterchase+1.0));
if (biquad[0] != frequencychase) {biquad[0] = frequencychase; K = tan(M_PI * biquad[0]);}
if (biquad[1] != resonancechase) {biquad[1] = resonancechase; norm = 1.0 / (1.0 + K / biquad[1] + K * K);}
if (type == 1) { //lowpass
biquad[2] = K * K * norm;
biquad[3] = 2.0 * biquad[2];
biquad[4] = biquad[2];
biquad[5] = 2.0 * (K * K - 1.0) * norm;
}
if (type == 2) { //highpass
biquad[2] = norm;
biquad[3] = -2.0 * biquad[2];
biquad[4] = biquad[2];
biquad[5] = 2.0 * (K * K - 1.0) * norm;
}
if (type == 3) { //bandpass
biquad[2] = K / biquad[1] * norm;
biquad[3] = 0.0; //bandpass can simplify the biquad kernel: leave out this multiply
biquad[4] = -biquad[2];
biquad[5] = 2.0 * (K * K - 1.0) * norm;
}
if (type == 4) { //notch
biquad[2] = (1.0 + K * K) * norm;
biquad[3] = 2.0 * (K * K - 1) * norm;
biquad[4] = biquad[2];
biquad[5] = biquad[3];
}
biquad[6] = (1.0 - K / biquad[1] + K * K) * norm;
inputSample = sin(inputSample);
//encode Console5: good cleanness
long double outSample = biquad[2]*inputSample+biquad[3]*biquad[7]+biquad[4]*biquad[8]-biquad[5]*biquad[9]-biquad[6]*biquad[10];
biquad[8] = biquad[7]; biquad[7] = inputSample; inputSample = outSample; biquad[10] = biquad[9]; biquad[9] = inputSample; //DF1
if (inputSample > 1.0) inputSample = 1.0;
if (inputSample < -1.0) inputSample = -1.0;
b[9] = b[8]; b[8] = b[7]; b[7] = b[6]; b[6] = b[5];
b[5] = b[4]; b[4] = b[3]; b[3] = b[2]; b[2] = b[1];
b[1] = b[0]; b[0] = inputSample;
inputSample *= f[0];
inputSample += (b[1] * f[1]);
inputSample += (b[2] * f[2]);
inputSample += (b[3] * f[3]);
inputSample += (b[4] * f[4]);
inputSample += (b[5] * f[5]);
inputSample += (b[6] * f[6]);
inputSample += (b[7] * f[7]);
inputSample += (b[8] * f[8]);
inputSample += (b[9] * f[9]); //intense averaging on deeper cutoffs
if (inputSample > 1.0) inputSample = 1.0;
if (inputSample < -1.0) inputSample = -1.0;
//without this, you can get a NaN condition where it spits out DC offset at full blast!
inputSample = asin(inputSample);
//amplitude aspect
if (inputSample > 1.0) inputSample = 1.0;
if (inputSample < -1.0) inputSample = -1.0;
//and then Console5 will spit out overs if you let it
if (outputchase < 1.0) {
inputSample *= outputchase;
}
if (wetchase < 1.0) {
inputSample = (inputSample*wetchase) + (drySample*(1.0-fabs(wetchase)));
//inv/dry/wet lets us turn LP into HP and band into notch
}
//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;
}
}
