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330 lines
15 KiB
C++
330 lines
15 KiB
C++
/*
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* File: ZLowpass.cpp
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*
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* Version: 1.0
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*
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* Created: 4/27/21
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*
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* Copyright: Copyright © 2021 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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ZLowpass.cpp
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=============================================================================*/
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#include "ZLowpass.h"
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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COMPONENT_ENTRY(ZLowpass)
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// ZLowpass::ZLowpass
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ZLowpass::ZLowpass(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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#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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// ZLowpass::GetParameterValueStrings
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult ZLowpass::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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// ZLowpass::GetParameterInfo
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult ZLowpass::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.minValue = 0.0;
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outParameterInfo.maxValue = 1.0;
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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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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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// ZLowpass::GetPropertyInfo
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult ZLowpass::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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// ZLowpass::GetProperty
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult ZLowpass::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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// ZLowpass::Initialize
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult ZLowpass::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 ____ZLowpassEffectKernel
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// ZLowpass::ZLowpassKernel::Reset()
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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void ZLowpass::ZLowpassKernel::Reset()
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{
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for (int x = 0; x < 11; x++) {biquadA[x] = 0.0; biquadB[x] = 0.0; biquadC[x] = 0.0; biquadD[x] = 0.0; biquadE[x] = 0.0; biquadF[x] = 0.0;}
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iirSampleA = 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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// ZLowpass::ZLowpassKernel::Process
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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void ZLowpass::ZLowpassKernel::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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biquadA[0] = ((pow(GetParameter( kParam_Two ),3)*18930.0)/GetSampleRate())+0.00162;
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double clipFactor = 1.212-((1.0-GetParameter( kParam_Two ))*0.496);
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biquadA[1] = 0.7071;
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double K = tan(M_PI * biquadA[0]);
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double norm = 1.0 / (1.0 + K / biquadA[1] + K * K);
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biquadA[2] = K * K * norm;
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biquadA[3] = 2.0 * biquadA[2];
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biquadA[4] = biquadA[2];
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biquadA[5] = 2.0 * (K * K - 1.0) * norm;
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biquadA[6] = (1.0 - K / biquadA[1] + K * K) * norm;
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for (int x = 0; x < 7; x++) {biquadD[x] = biquadC[x] = biquadB[x] = biquadA[x];}
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//opamp stuff
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double inTrim = GetParameter( kParam_One )*10.0;
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inTrim *= inTrim; inTrim *= inTrim;
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double outPad = GetParameter( kParam_Three )*10.0;
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double iirAmountA = 0.00069/overallscale;
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biquadF[0] = biquadE[0] = 15500.0 / GetSampleRate();
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biquadF[1] = biquadE[1] = 0.935;
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K = tan(M_PI * biquadE[0]); //lowpass
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norm = 1.0 / (1.0 + K / biquadE[1] + K * K);
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biquadE[2] = K * K * norm;
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biquadE[3] = 2.0 * biquadE[2];
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biquadE[4] = biquadE[2];
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biquadE[5] = 2.0 * (K * K - 1.0) * norm;
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biquadE[6] = (1.0 - K / biquadE[1] + K * K) * norm;
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for (int x = 0; x < 7; x++) biquadF[x] = biquadE[x];
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//end opamp stuff
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double trim = 0.1+(3.712*biquadA[0]);
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double wet = pow(GetParameter( kParam_Four ),2);
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double aWet = 1.0;
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double bWet = 1.0;
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double cWet = 1.0;
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double dWet = wet*4.0;
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//four-stage wet/dry control using progressive stages that bypass when not engaged
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if (dWet < 1.0) {aWet = dWet; bWet = 0.0; cWet = 0.0; dWet = 0.0;}
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else if (dWet < 2.0) {bWet = dWet - 1.0; cWet = 0.0; dWet = 0.0;}
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else if (dWet < 3.0) {cWet = dWet - 2.0; dWet = 0.0;}
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else {dWet -= 3.0;}
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//this is one way to make a little set of dry/wet stages that are successively added to the
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//output as the control is turned up. Each one independently goes from 0-1 and stays at 1
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//beyond that point: this is a way to progressively add a 'black box' sound processing
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//which lets you fall through to simpler processing at lower settings.
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double outSample = 0.0;
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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 = inputSample;
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double overallDrySample = drySample;
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if (inTrim != 1.0) inputSample *= inTrim;
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if (inputSample > 1.0) inputSample = 1.0; if (inputSample < -1.0) inputSample = -1.0;
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inputSample *= trim;
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inputSample /= clipFactor;
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outSample = biquadA[2]*inputSample+biquadA[3]*biquadA[7]+biquadA[4]*biquadA[8]-biquadA[5]*biquadA[9]-biquadA[6]*biquadA[10];
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biquadA[8] = biquadA[7]; biquadA[7] = inputSample; biquadA[10] = biquadA[9];
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if (outSample > 1.0) outSample = 1.0;
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if (outSample < -1.0) outSample = -1.0;
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drySample = inputSample = biquadA[9] = outSample; //DF1
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if (bWet > 0.0) {
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inputSample /= clipFactor;
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outSample = biquadB[2]*inputSample+biquadB[3]*biquadB[7]+biquadB[4]*biquadB[8]-biquadB[5]*biquadB[9]-biquadB[6]*biquadB[10];
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biquadB[8] = biquadB[7]; biquadB[7] = inputSample; biquadB[10] = biquadB[9];
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if (outSample > 1.0) outSample = 1.0;
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if (outSample < -1.0) outSample = -1.0;
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biquadB[9] = outSample; //DF1
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drySample = inputSample = (outSample * bWet) + (drySample * (1.0-bWet));
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}
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if (cWet > 0.0) {
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inputSample /= clipFactor;
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outSample = biquadC[2]*inputSample+biquadC[3]*biquadC[7]+biquadC[4]*biquadC[8]-biquadC[5]*biquadC[9]-biquadC[6]*biquadC[10];
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biquadC[8] = biquadC[7]; biquadC[7] = inputSample; biquadC[10] = biquadC[9];
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if (outSample > 1.0) outSample = 1.0;
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if (outSample < -1.0) outSample = -1.0;
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biquadC[9] = outSample; //DF1
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drySample = inputSample = (outSample * cWet) + (drySample * (1.0-cWet));
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}
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if (dWet > 0.0) {
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inputSample /= clipFactor;
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outSample = biquadD[2]*inputSample+biquadD[3]*biquadD[7]+biquadD[4]*biquadD[8]-biquadD[5]*biquadD[9]-biquadD[6]*biquadD[10];
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biquadD[8] = biquadD[7]; biquadD[7] = inputSample; biquadD[10] = biquadD[9];
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if (outSample > 1.0) outSample = 1.0;
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if (outSample < -1.0) outSample = -1.0;
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biquadD[9] = outSample; //DF1
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drySample = inputSample = (outSample * dWet) + (drySample * (1.0-dWet));
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}
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inputSample /= clipFactor;
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//opamp stage
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if (fabs(iirSampleA)<1.18e-37) iirSampleA = 0.0;
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iirSampleA = (iirSampleA * (1.0 - iirAmountA)) + (inputSample * iirAmountA);
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inputSample -= iirSampleA;
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outSample = biquadE[2]*inputSample+biquadE[3]*biquadE[7]+biquadE[4]*biquadE[8]-biquadE[5]*biquadE[9]-biquadE[6]*biquadE[10];
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biquadE[8] = biquadE[7]; biquadE[7] = inputSample; inputSample = outSample; biquadE[10] = biquadE[9]; biquadE[9] = inputSample; //DF1
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if (inputSample > 1.0) inputSample = 1.0; if (inputSample < -1.0) inputSample = -1.0;
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inputSample -= (inputSample*inputSample*inputSample*inputSample*inputSample*0.1768);
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outSample = biquadF[2]*inputSample+biquadF[3]*biquadF[7]+biquadF[4]*biquadF[8]-biquadF[5]*biquadF[9]-biquadF[6]*biquadF[10];
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biquadF[8] = biquadF[7]; biquadF[7] = inputSample; inputSample = outSample; biquadF[10] = biquadF[9]; biquadF[9] = inputSample; //DF1
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if (outPad != 1.0) inputSample *= outPad;
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//end opamp stage
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if (aWet !=1.0) {
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inputSample = (inputSample * aWet) + (overallDrySample * (1.0-aWet));
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}
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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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