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323 lines
14 KiB
C++
Executable file
323 lines
14 KiB
C++
Executable file
/*
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* File: BiquadNonLin.cpp
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*
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* Version: 1.0
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*
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* Created: 3/5/24
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*
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* Copyright: Copyright © 2024 Airwindows, Airwindows uses the MIT license
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*
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* Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc. ("Apple") in
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* consideration of your agreement to the following terms, and your use, installation, modification
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* or redistribution of this Apple software constitutes acceptance of these terms. If you do
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* not agree with these terms, please do not use, install, modify or redistribute this Apple
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* software.
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*
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* In consideration of your agreement to abide by the following terms, and subject to these terms,
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* Apple grants you a personal, non-exclusive license, under Apple's copyrights in this
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* original Apple software (the "Apple Software"), to use, reproduce, modify and redistribute the
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* Apple Software, with or without modifications, in source and/or binary forms; provided that if you
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* redistribute the Apple Software in its entirety and without modifications, you must retain this
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* notice and the following text and disclaimers in all such redistributions of the Apple Software.
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* Neither the name, trademarks, service marks or logos of Apple Computer, Inc. may be used to
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* endorse or promote products derived from the Apple Software without specific prior written
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* permission from Apple. Except as expressly stated in this notice, no other rights or
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* licenses, express or implied, are granted by Apple herein, including but not limited to any
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* patent rights that may be infringed by your derivative works or by other works in which the
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* Apple Software may be incorporated.
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*
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* The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO WARRANTIES, EXPRESS OR
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* IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE
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* OR IN COMBINATION WITH YOUR PRODUCTS.
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*
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* IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE,
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* REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER
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* UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN
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* IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/*=============================================================================
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BiquadNonLin.cpp
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=============================================================================*/
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#include "BiquadNonLin.h"
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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AUDIOCOMPONENT_ENTRY(AUBaseFactory, BiquadNonLin)
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// BiquadNonLin::BiquadNonLin
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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BiquadNonLin::BiquadNonLin(AudioUnit component)
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: AUEffectBase(component)
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{
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CreateElements();
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Globals()->UseIndexedParameters(kNumberOfParameters);
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SetParameter(kParam_One, kDefaultValue_ParamOne );
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SetParameter(kParam_Two, kDefaultValue_ParamTwo );
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SetParameter(kParam_Three, kDefaultValue_ParamThree );
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SetParameter(kParam_Four, kDefaultValue_ParamFour );
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SetParameter(kParam_Five, kDefaultValue_ParamFive );
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#if AU_DEBUG_DISPATCHER
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mDebugDispatcher = new AUDebugDispatcher (this);
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#endif
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}
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// BiquadNonLin::GetParameterValueStrings
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult BiquadNonLin::GetParameterValueStrings(AudioUnitScope inScope,
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AudioUnitParameterID inParameterID,
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CFArrayRef * outStrings)
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{
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return kAudioUnitErr_InvalidProperty;
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}
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// BiquadNonLin::GetParameterInfo
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult BiquadNonLin::GetParameterInfo(AudioUnitScope inScope,
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AudioUnitParameterID inParameterID,
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AudioUnitParameterInfo &outParameterInfo )
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{
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ComponentResult result = noErr;
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outParameterInfo.flags = kAudioUnitParameterFlag_IsWritable
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| kAudioUnitParameterFlag_IsReadable;
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if (inScope == kAudioUnitScope_Global) {
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switch(inParameterID)
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{
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case kParam_One:
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AUBase::FillInParameterName (outParameterInfo, kParameterOneName, false);
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outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
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outParameterInfo.minValue = 0.0;
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outParameterInfo.maxValue = 1.0;
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outParameterInfo.defaultValue = kDefaultValue_ParamOne;
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break;
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case kParam_Two:
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AUBase::FillInParameterName (outParameterInfo, kParameterTwoName, false);
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outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
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outParameterInfo.minValue = 0.0;
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outParameterInfo.maxValue = 1.0;
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outParameterInfo.defaultValue = kDefaultValue_ParamTwo;
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break;
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case kParam_Three:
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AUBase::FillInParameterName (outParameterInfo, kParameterThreeName, false);
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outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
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outParameterInfo.flags |= kAudioUnitParameterFlag_DisplayLogarithmic;
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outParameterInfo.minValue = 0.01;
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outParameterInfo.maxValue = 30.0;
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outParameterInfo.defaultValue = kDefaultValue_ParamThree;
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break;
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case kParam_Four:
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AUBase::FillInParameterName (outParameterInfo, kParameterFourName, false);
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outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
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outParameterInfo.minValue = 0.0;
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outParameterInfo.maxValue = 1.0;
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outParameterInfo.defaultValue = kDefaultValue_ParamFour;
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break;
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case kParam_Five:
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AUBase::FillInParameterName (outParameterInfo, kParameterFiveName, false);
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outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
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outParameterInfo.minValue = -1.0;
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outParameterInfo.maxValue = 1.0;
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outParameterInfo.defaultValue = kDefaultValue_ParamFive;
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break;
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default:
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result = kAudioUnitErr_InvalidParameter;
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break;
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}
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} else {
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result = kAudioUnitErr_InvalidParameter;
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}
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return result;
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}
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// BiquadNonLin::GetPropertyInfo
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult BiquadNonLin::GetPropertyInfo (AudioUnitPropertyID inID,
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AudioUnitScope inScope,
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AudioUnitElement inElement,
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UInt32 & outDataSize,
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Boolean & outWritable)
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{
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return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
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}
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// BiquadNonLin::GetProperty
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult BiquadNonLin::GetProperty( AudioUnitPropertyID inID,
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AudioUnitScope inScope,
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AudioUnitElement inElement,
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void * outData )
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{
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return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
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}
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// BiquadNonLin::Initialize
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult BiquadNonLin::Initialize()
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{
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ComponentResult result = AUEffectBase::Initialize();
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if (result == noErr)
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Reset(kAudioUnitScope_Global, 0);
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return result;
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}
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#pragma mark ____BiquadNonLinEffectKernel
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// BiquadNonLin::BiquadNonLinKernel::Reset()
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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void BiquadNonLin::BiquadNonLinKernel::Reset()
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{
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for (int x = 0; x < biq_total; x++) {biquad[x] = 0.0;}
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fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
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}
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// BiquadNonLin::BiquadNonLinKernel::Process
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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void BiquadNonLin::BiquadNonLinKernel::Process( const Float32 *inSourceP,
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Float32 *inDestP,
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UInt32 inFramesToProcess,
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UInt32 inNumChannels,
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bool &ioSilence )
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{
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UInt32 nSampleFrames = inFramesToProcess;
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const Float32 *sourceP = inSourceP;
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Float32 *destP = inDestP;
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double overallscale = 1.0;
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overallscale /= 44100.0;
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overallscale *= GetSampleRate();
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int type = 0;
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if (GetParameter( kParam_One ) > 0.5) type = 1;
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biquad[biq_freq] = ((pow(GetParameter( kParam_Two ),3)*20000.0)/GetSampleRate());
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if (biquad[biq_freq] < 0.0001) biquad[biq_freq] = 0.0001;
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biquad[biq_reso] = GetParameter( kParam_Three );
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if (biquad[biq_reso] < 0.0001) biquad[biq_reso] = 0.0001;
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double nonLin = pow(GetParameter( kParam_Four ),2);
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//if you're using a 0.5 for a lowpass fixed frequency, value is 0.25
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double wet = GetParameter( kParam_Five );
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//biquad contains these values:
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//[0] is frequency: 0.000001 to 0.499999 is near-zero to near-Nyquist
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//[1] is resonance, 0.7071 is Butterworth. Also can't be zero
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//[2] is a0 but you need distinct ones for additional biquad instances so it's here
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//[3] is a1 but you need distinct ones for additional biquad instances so it's here
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//[4] is a2 but you need distinct ones for additional biquad instances so it's here
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//[5] is b1 but you need distinct ones for additional biquad instances so it's here
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//[6] is b2 but you need distinct ones for additional biquad instances so it's here
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//[7] is LEFT stored delayed sample (freq and res are stored so you can move them sample by sample)
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//[8] is LEFT stored delayed sample (you have to include the coefficient making code if you do that)
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//[9] is RIGHT stored delayed sample (freq and res are stored so you can move them sample by sample)
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//[10] is RIGHT stored delayed sample (you have to include the coefficient making code if you do that)
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//to build a dedicated filter, rename 'biquad' to whatever the new filter is, then
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//put this code either within the sample buffer (for smoothly modulating freq or res)
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//or in this 'read the controls' area (for letting you change freq and res with controls)
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//or in 'reset' if the freq and res are absolutely fixed (use GetSampleRate to define freq)
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biquad[biq_aA0] = biquad[biq_aB0];
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biquad[biq_aA1] = biquad[biq_aB1];
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biquad[biq_aA2] = biquad[biq_aB2];
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biquad[biq_bA1] = biquad[biq_bB1];
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biquad[biq_bA2] = biquad[biq_bB2];
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//previous run through the buffer is still in the filter, so we move it
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//to the A section and now it's the new starting point.
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if (type == 0) { //lowpass
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double K = tan(M_PI * biquad[biq_freq]);
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double norm = 1.0 / (1.0 + K / biquad[biq_reso] + K * K);
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biquad[biq_aB0] = K * K * norm;
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biquad[biq_aB1] = 2.0 * biquad[biq_aB0];
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biquad[biq_aB2] = biquad[biq_aB0];
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biquad[biq_bB1] = 2.0 * (K * K - 1.0) * norm;
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biquad[biq_bB2] = (1.0 - K / biquad[biq_reso] + K * K) * norm;
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}
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if (type == 1) { //bandpass
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double K = tan(M_PI * biquad[biq_freq]);
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double norm = 1.0 / (1.0 + K / biquad[biq_reso] + K * K);
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biquad[biq_aB0] = K / biquad[biq_reso] * norm;
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biquad[biq_aB1] = 0.0; //bandpass can simplify the biquad kernel: leave out this multiply
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biquad[biq_aB2] = -biquad[biq_aB0];
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biquad[biq_bB1] = 2.0 * (K * K - 1.0) * norm;
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biquad[biq_bB2] = (1.0 - K / biquad[biq_reso] + K * K) * norm;
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}
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if (biquad[biq_aA0] == 0.0) { // if we have just started, start directly with raw info
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biquad[biq_aA0] = biquad[biq_aB0];
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biquad[biq_aA1] = biquad[biq_aB1];
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biquad[biq_aA2] = biquad[biq_aB2];
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biquad[biq_bA1] = biquad[biq_bB1];
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biquad[biq_bA2] = biquad[biq_bB2];
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}
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while (nSampleFrames-- > 0) {
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double inputSample = *sourceP;
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if (fabs(inputSample)<1.18e-23) inputSample = fpd * 1.18e-17;
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double drySample = *sourceP;
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double buf = (double)nSampleFrames/inFramesToProcess;
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biquad[biq_a0] = (biquad[biq_aA0]*buf)+(biquad[biq_aB0]*(1.0-buf));
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biquad[biq_a1] = (biquad[biq_aA1]*buf)+(biquad[biq_aB1]*(1.0-buf));
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biquad[biq_a2] = (biquad[biq_aA2]*buf)+(biquad[biq_aB2]*(1.0-buf));
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biquad[biq_b1] = (biquad[biq_bA1]*buf)+(biquad[biq_bB1]*(1.0-buf));
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biquad[biq_b2] = (biquad[biq_bA2]*buf)+(biquad[biq_bB2]*(1.0-buf));
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double dia0 = fabs(biquad[biq_a0]*(1.0+(inputSample*nonLin))); if (dia0 > 1.0) dia0 = 1.0;
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double dia2 = dia0; //if lowpass, use this in both places
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if (type == 1) dia2 = -dia2;
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//if bandpass, you must reverse polarity
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double tempSample = (inputSample * dia0) + biquad[biq_sL1];
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biquad[biq_sL1] = (inputSample * biquad[biq_a1]) - (tempSample * biquad[biq_b1]) + biquad[biq_sL2];
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biquad[biq_sL2] = (inputSample * dia2) - (tempSample * biquad[biq_b2]);
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inputSample = tempSample;
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inputSample *= wet;
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if (wet > 0.0) {
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inputSample += (drySample*(1.0-wet));
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} else {
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inputSample += drySample;
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} //inv/dry/wet lets us turn LP into HP and band into notch
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//begin 32 bit floating point dither
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int expon; frexpf((float)inputSample, &expon);
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fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
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inputSample += ((double(fpd)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
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//end 32 bit floating point dither
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*destP = inputSample;
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sourceP += inNumChannels; destP += inNumChannels;
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}
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}
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