/*
* File: BiquadStereo.cpp
*
* Version: 1.0
*
* Created: 6/29/19
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/*=============================================================================
BiquadStereo.cpp
=============================================================================*/
#include "BiquadStereo.h"
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
COMPONENT_ENTRY(BiquadStereo)
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BiquadStereo::BiquadStereo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BiquadStereo::BiquadStereo(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
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BiquadStereo::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BiquadStereo::GetParameterValueStrings(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
CFArrayRef * outStrings)
{
return kAudioUnitErr_InvalidProperty;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BiquadStereo::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BiquadStereo::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;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BiquadStereo::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BiquadStereo::GetPropertyInfo (AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
UInt32 & outDataSize,
Boolean & outWritable)
{
return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// state that plugin supports only stereo-in/stereo-out processing
UInt32 BiquadStereo::SupportedNumChannels(const AUChannelInfo ** outInfo)
{
if (outInfo != NULL)
{
static AUChannelInfo info;
info.inChannels = 2;
info.outChannels = 2;
*outInfo = &info;
}
return 1;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BiquadStereo::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BiquadStereo::GetProperty( AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
void * outData )
{
return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}
// BiquadStereo::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BiquadStereo::Initialize()
{
ComponentResult result = AUEffectBase::Initialize();
if (result == noErr)
Reset(kAudioUnitScope_Global, 0);
return result;
}
#pragma mark ____BiquadStereoEffectKernel
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BiquadStereo::BiquadStereoKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BiquadStereo::Reset(AudioUnitScope inScope, AudioUnitElement inElement)
{
for (int x = 0; x < 11; x++) {biquad[x] = 0.0;}
fpd = 17;
return noErr;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BiquadStereo::ProcessBufferLists
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
OSStatus BiquadStereo::ProcessBufferLists(AudioUnitRenderActionFlags & ioActionFlags,
const AudioBufferList & inBuffer,
AudioBufferList & outBuffer,
UInt32 inFramesToProcess)
{
Float32 * inputL = (Float32*)(inBuffer.mBuffers[0].mData);
Float32 * inputR = (Float32*)(inBuffer.mBuffers[1].mData);
Float32 * outputL = (Float32*)(outBuffer.mBuffers[0].mData);
Float32 * outputR = (Float32*)(outBuffer.mBuffers[1].mData);
UInt32 nSampleFrames = inFramesToProcess;
long double overallscale = 1.0;
overallscale /= 44100.0;
overallscale *= GetSampleRate();
int type = GetParameter( kParam_One);
biquad[0] = GetParameter( kParam_Two )*0.499;
if (biquad[0] < 0.0001) biquad[0] = 0.0001;
biquad[1] = GetParameter( kParam_Three );
if (biquad[1] < 0.0001) biquad[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 LEFT stored delayed sample (freq and res are stored so you can move them sample by sample)
//[8] is LEFT stored delayed sample (you have to include the coefficient making code if you do that)
//[9] is RIGHT stored delayed sample (freq and res are stored so you can move them sample by sample)
//[10] is RIGHT 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 * biquad[0]);
double norm = 1.0 / (1.0 + K / biquad[1] + K * K);
biquad[2] = K * K * norm;
biquad[3] = 2.0 * biquad[2];
biquad[4] = biquad[2];
biquad[5] = 2.0 * (K * K - 1.0) * norm;
biquad[6] = (1.0 - K / biquad[1] + K * K) * norm;
}
if (type == 2) { //highpass
double K = tan(M_PI * biquad[0]);
double norm = 1.0 / (1.0 + K / biquad[1] + K * K);
biquad[2] = norm;
biquad[3] = -2.0 * biquad[2];
biquad[4] = biquad[2];
biquad[5] = 2.0 * (K * K - 1.0) * norm;
biquad[6] = (1.0 - K / biquad[1] + K * K) * norm;
}
if (type == 3) { //bandpass
double K = tan(M_PI * biquad[0]);
double norm = 1.0 / (1.0 + K / biquad[1] + K * K);
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;
biquad[6] = (1.0 - K / biquad[1] + K * K) * norm;
}
if (type == 4) { //notch
double K = tan(M_PI * biquad[0]);
double norm = 1.0 / (1.0 + K / biquad[1] + K * K);
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;
}
while (nSampleFrames-- > 0) {
long double inputSampleL = *inputL;
long double inputSampleR = *inputR;
if (fabs(inputSampleL)<1.18e-37) inputSampleL = fpd * 1.18e-37;
if (fabs(inputSampleR)<1.18e-37) inputSampleR = fpd * 1.18e-37;
long double drySampleL = inputSampleL;
long double drySampleR = inputSampleR;
inputSampleL = sin(inputSampleL);
inputSampleR = sin(inputSampleR);
//encode Console5: good cleanness
/*
long double mid = inputSampleL + inputSampleR;
long double side = inputSampleL - inputSampleR;
//assign mid and side.Between these sections, you can do mid/side processing
long double tempSampleM = (mid * biquad[2]) + biquad[7];
biquad[7] = (mid * biquad[3]) - (tempSampleM * biquad[5]) + biquad[8];
biquad[8] = (mid * biquad[4]) - (tempSampleM * biquad[6]);
mid = tempSampleM; //like mono AU, 7 and 8 store mid channel
long double tempSampleS = (side * biquad[2]) + biquad[9];
biquad[9] = (side * biquad[3]) - (tempSampleS * biquad[5]) + biquad[10];
biquad[10] = (side * biquad[4]) - (tempSampleS * biquad[6]);
inputSampleR = tempSampleS; //note: 9 and 10 store the side channel
inputSampleL = (mid+side)/2.0;
inputSampleR = (mid-side)/2.0;
//unassign mid and side
*/
long double tempSampleL = (inputSampleL * biquad[2]) + biquad[7];
biquad[7] = (inputSampleL * biquad[3]) - (tempSampleL * biquad[5]) + biquad[8];
biquad[8] = (inputSampleL * biquad[4]) - (tempSampleL * biquad[6]);
inputSampleL = tempSampleL; //like mono AU, 7 and 8 store L channel
long double tempSampleR = (inputSampleR * biquad[2]) + biquad[9];
biquad[9] = (inputSampleR * biquad[3]) - (tempSampleR * biquad[5]) + biquad[10];
biquad[10] = (inputSampleR * biquad[4]) - (tempSampleR * biquad[6]);
inputSampleR = tempSampleR; //note: 9 and 10 store the R channel
if (inputSampleL > 1.0) inputSampleL = 1.0;
if (inputSampleL < -1.0) inputSampleL = -1.0;
if (inputSampleR > 1.0) inputSampleR = 1.0;
if (inputSampleR < -1.0) inputSampleR = -1.0;
//without this, you can get a NaN condition where it spits out DC offset at full blast!
inputSampleL = asin(inputSampleL);
inputSampleR = asin(inputSampleR);
//amplitude aspect
if (wet < 1.0) {
inputSampleL = (inputSampleL*wet) + (drySampleL*(1.0-fabs(wet)));
inputSampleR = (inputSampleR*wet) + (drySampleR*(1.0-fabs(wet)));
//inv/dry/wet lets us turn LP into HP and band into notch
}
//begin 32 bit stereo floating point dither
int expon; frexpf((float)inputSampleL, &expon);
fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
inputSampleL += ((double(fpd)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
frexpf((float)inputSampleR, &expon);
fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
inputSampleR += ((double(fpd)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
//end 32 bit stereo floating point dither
*outputL = inputSampleL;
*outputR = inputSampleR;
//direct stereo out
inputL += 1;
inputR += 1;
outputL += 1;
outputR += 1;
}
return noErr;
}
