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/*
* File: BiquadOneHalf.cpp
*
* Version: 1.0
*
* Created: 12/20/19
*
* Copyright: Copyright � 2019 Airwindows, All Rights Reserved
*
* Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc. ("Apple") in
* consideration of your agreement to the following terms, and your use, installation, modification
* or redistribution of this Apple software constitutes acceptance of these terms. If you do
* not agree with these terms, please do not use, install, modify or redistribute this Apple
* software.
*
* In consideration of your agreement to abide by the following terms, and subject to these terms,
* Apple grants you a personal, non-exclusive license, under Apple's copyrights in this
* original Apple software (the "Apple Software"), to use, reproduce, modify and redistribute the
* Apple Software, with or without modifications, in source and/or binary forms; provided that if you
* redistribute the Apple Software in its entirety and without modifications, you must retain this
* notice and the following text and disclaimers in all such redistributions of the Apple Software.
* Neither the name, trademarks, service marks or logos of Apple Computer, Inc. may be used to
* endorse or promote products derived from the Apple Software without specific prior written
* permission from Apple. Except as expressly stated in this notice, no other rights or
* licenses, express or implied, are granted by Apple herein, including but not limited to any
* patent rights that may be infringed by your derivative works or by other works in which the
* Apple Software may be incorporated.
*
* The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO WARRANTIES, EXPRESS OR
* IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE
* OR IN COMBINATION WITH YOUR PRODUCTS.
*
* IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE,
* REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER
* UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN
* IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/*=============================================================================
BiquadOneHalf.cpp
=============================================================================*/
#include "BiquadOneHalf.h"
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
COMPONENT_ENTRY(BiquadOneHalf)
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BiquadOneHalf::BiquadOneHalf
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BiquadOneHalf::BiquadOneHalf(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
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BiquadOneHalf::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BiquadOneHalf::GetParameterValueStrings(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
CFArrayRef * outStrings)
{
return kAudioUnitErr_InvalidProperty;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BiquadOneHalf::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BiquadOneHalf::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 = 1.0;
outParameterInfo.maxValue = 4.0;
outParameterInfo.defaultValue = kDefaultValue_ParamOne;
break;
case kParam_Two:
AUBase::FillInParameterName (outParameterInfo, kParameterTwoName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.flags |= kAudioUnitParameterFlag_DisplayLogarithmic;
outParameterInfo.minValue = 0.0001;
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 = 0.01;
outParameterInfo.maxValue = 30.0;
outParameterInfo.defaultValue = kDefaultValue_ParamThree;
break;
case kParam_Four:
AUBase::FillInParameterName (outParameterInfo, kParameterFourName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.minValue = -1.0;
outParameterInfo.maxValue = 1.0;
outParameterInfo.defaultValue = kDefaultValue_ParamFour;
break;
default:
result = kAudioUnitErr_InvalidParameter;
break;
}
} else {
result = kAudioUnitErr_InvalidParameter;
}
return result;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BiquadOneHalf::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BiquadOneHalf::GetPropertyInfo (AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
UInt32 & outDataSize,
Boolean & outWritable)
{
return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BiquadOneHalf::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BiquadOneHalf::GetProperty( AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
void * outData )
{
return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}
// BiquadOneHalf::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BiquadOneHalf::Initialize()
{
ComponentResult result = AUEffectBase::Initialize();
if (result == noErr)
Reset(kAudioUnitScope_Global, 0);
return result;
}
#pragma mark ____BiquadOneHalfEffectKernel
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BiquadOneHalf::BiquadOneHalfKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void BiquadOneHalf::BiquadOneHalfKernel::Reset()
{
for (int x = 0; x < 9; x++) {biquadA[x] = 0.0;biquadB[x] = 0.0;}
flip = false;
fpd = 17;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BiquadOneHalf::BiquadOneHalfKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void BiquadOneHalf::BiquadOneHalfKernel::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();
int type = GetParameter( kParam_One);
//originalbiquad[0] = 600.0/GetSampleRate(); //fixed frequency, 600hz
//interleavedbiquad[0] = 1200.0/GetSampleRate(); //fixed frequency, 600hz
//using the interleaved biquad you have to specify double the frequency you otherwise would,
//and it still must remain less than 0.5 in total
biquadA[0] = GetParameter( kParam_Two )*0.499;
if (biquadA[0] < 0.0001) biquadA[0] = 0.0001;
biquadA[1] = GetParameter( kParam_Three );
if (biquadA[1] < 0.0001) biquadA[1] = 0.0001;
Float64 wet = GetParameter( kParam_Four );
//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)
//to build a dedicated filter, rename 'biquad' to whatever the new filter is, then
//put this code either within the sample buffer (for smoothly modulating freq or res)
//or in this 'read the controls' area (for letting you change freq and res with controls)
//or in 'reset' if the freq and res are absolutely fixed (use GetSampleRate to define freq)
if (type == 1) { //lowpass
double K = tan(M_PI * biquadA[0]);
double norm = 1.0 / (1.0 + K / biquadA[1] + K * K);
biquadA[2] = K * K * norm;
biquadA[3] = 2.0 * biquadA[2];
biquadA[4] = biquadA[2];
biquadA[5] = 2.0 * (K * K - 1.0) * norm;
biquadA[6] = (1.0 - K / biquadA[1] + K * K) * norm;
}
if (type == 2) { //highpass
double K = tan(M_PI * biquadA[0]);
double norm = 1.0 / (1.0 + K / biquadA[1] + K * K);
biquadA[2] = norm;
biquadA[3] = -2.0 * biquadA[2];
biquadA[4] = biquadA[2];
biquadA[5] = 2.0 * (K * K - 1.0) * norm;
biquadA[6] = (1.0 - K / biquadA[1] + K * K) * norm;
}
if (type == 3) { //bandpass
double K = tan(M_PI * biquadA[0]);
double norm = 1.0 / (1.0 + K / biquadA[1] + K * K);
biquadA[2] = K / biquadA[1] * norm;
biquadA[3] = 0.0; //bandpass can simplify the biquad kernel: leave out this multiply
biquadA[4] = -biquadA[2];
biquadA[5] = 2.0 * (K * K - 1.0) * norm;
biquadA[6] = (1.0 - K / biquadA[1] + K * K) * norm;
}
if (type == 4) { //notch
double K = tan(M_PI * biquadA[0]);
double norm = 1.0 / (1.0 + K / biquadA[1] + K * K);
biquadA[2] = (1.0 + K * K) * norm;
biquadA[3] = 2.0 * (K * K - 1) * norm;
biquadA[4] = biquadA[2];
biquadA[5] = biquadA[3];
biquadA[6] = (1.0 - K / biquadA[1] + K * K) * norm;
}
for (int x = 0; x < 9; x++) {biquadB[x] = biquadA[x];}
while (nSampleFrames-- > 0) {
long double inputSample = *sourceP;
if (fabs(inputSample)<1.18e-37) inputSample = fpd * 1.18e-37;
long double drySample = *sourceP;
inputSample = sin(inputSample);
//encode Console5: good cleanness
long double tempSample;
if (flip)
{
tempSample = (inputSample * biquadA[2]) + biquadA[7];
biquadA[7] = (inputSample * biquadA[3]) - (tempSample * biquadA[5]) + biquadA[8];
biquadA[8] = (inputSample * biquadA[4]) - (tempSample * biquadA[6]);
inputSample = tempSample; //interleaved biquad
}
else
{
tempSample = (inputSample * biquadB[2]) + biquadB[7];
biquadB[7] = (inputSample * biquadB[3]) - (tempSample * biquadB[5]) + biquadB[8];
biquadB[8] = (inputSample * biquadB[4]) - (tempSample * biquadB[6]);
inputSample = tempSample; //interleaved biquad
}
flip = !flip;
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 (wet < 1.0) {
inputSample = (inputSample*wet) + (drySample*(1.0-fabs(wet)));
//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;
}
}
/*
if (type == 5) { //peak, but I prefer to assemble this from bandpass/notch
double biquad[0] = freq; // 0.000001 to 0.499999 is near-zero to near-Nyquist
double biquad[1] = reso; // 0.000001 to >10 is resonance, 0.7071 is Butterworth
double peakGain = boost; //negative or positive gain, in dB
if (peakGain >= 0) { // boost
double V = pow(10, fabs(peakGain) / 20.0);
double K = tan(M_PI * biquad[0]);
double norm = 1 / (1 + 1/biquad[1] * K + K * K);
biquad[2] = (1 + V/biquad[1] * K + K * K) * norm;
biquad[3] = 2 * (K * K - 1) * norm;
biquad[4] = (1 - V/biquad[1] * K + K * K) * norm;
biquad[5] = biquad[3];
biquad[6] = (1 - 1/biquad[1] * K + K * K) * norm;
} else {// cut
double V = pow(10, fabs(peakGain) / 20.0);
double K = tan(M_PI * biquad[0]);
double norm = 1 / (1 + V/biquad[1] * K + K * K);
biquad[2] = (1 + 1/biquad[1] * K + K * K) * norm;
biquad[3] = 2 * (K * K - 1) * norm;
biquad[4] = (1 - 1/biquad[1] * K + K * K) * norm;
biquad[5] = biquad[3];
biquad[6] = (1 - V/biquad[1] * K + K * K) * norm;
}
}
if (type == 6) { //lowshelf, but I prefer to assemble this from raw lowpass/highpass
double biquad[0] = freq; // 0.000001 to 0.499999 is near-zero to near-Nyquist
double peakGain = 0.0; //negative or positive gain, in dB
if (peakGain >= 0) { // boost
double V = pow(10, fabs(peakGain) / 20.0);
double K = tan(M_PI * biquad[0]);
double norm = 1 / (1 + sqrt(2) * K + K * K);
biquad[2] = (1 + sqrt(2*V) * K + V * K * K) * norm;
biquad[3] = 2 * (V * K * K - 1) * norm;
biquad[4] = (1 - sqrt(2*V) * K + V * K * K) * norm;
biquad[5] = 2 * (K * K - 1) * norm;
biquad[6] = (1 - sqrt(2) * K + K * K) * norm;
} else { // cut
double V = pow(10, fabs(peakGain) / 20.0);
double K = tan(M_PI * biquad[0]);
double norm = 1 / (1 + sqrt(2*V) * K + V * K * K);
biquad[2] = (1 + sqrt(2) * K + K * K) * norm;
biquad[3] = 2 * (K * K - 1) * norm;
biquad[4] = (1 - sqrt(2) * K + K * K) * norm;
biquad[5] = 2 * (V * K * K - 1) * norm;
biquad[6] = (1 - sqrt(2*V) * K + V * K * K) * norm;
}
}
if (type == 7) { //highshelf, but I prefer to assemble this from raw lowpass/highpass
double biquad[0] = freq; // 0.000001 to 0.499999 is near-zero to near-Nyquist
double peakGain = 0.0; //negative or positive gain, in dB
if (peakGain >= 0) { // boost
double V = pow(10, fabs(peakGain) / 20.0);
double K = tan(M_PI * biquad[0]);
double norm = 1 / (1 + sqrt(2) * K + K * K);
biquad[2] = (V + sqrt(2*V) * K + K * K) * norm;
biquad[3] = 2 * (K * K - V) * norm;
biquad[4] = (V - sqrt(2*V) * K + K * K) * norm;
biquad[5] = 2 * (K * K - 1) * norm;
biquad[6] = (1 - sqrt(2) * K + K * K) * norm;
} else { // cut
double V = pow(10, fabs(peakGain) / 20.0);
double K = tan(M_PI * biquad[0]);
double norm = 1 / (V + sqrt(2*V) * K + K * K);
biquad[2] = (1 + sqrt(2) * K + K * K) * norm;
biquad[3] = 2 * (K * K - 1) * norm;
biquad[4] = (1 - sqrt(2) * K + K * K) * norm;
biquad[5] = 2 * (K * K - V) * norm;
biquad[6] = (V - sqrt(2*V) * K + K * K) * norm;
}
}
*/
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