mirror of
https://github.com/airwindows/airwindows.git
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325 lines
14 KiB
C++
Executable file
325 lines
14 KiB
C++
Executable file
/*
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* File: ZAcidLowpass.cpp
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*
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* Version: 1.0
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*
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* Created: 2/10/26
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*
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* Copyright: Copyright © 2026 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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ZAcidLowpass.cpp
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=============================================================================*/
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#include "ZAcidLowpass.h"
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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AUDIOCOMPONENT_ENTRY(AUBaseFactory, ZAcidLowpass)
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// ZAcidLowpass::ZAcidLowpass
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ZAcidLowpass::ZAcidLowpass(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_A, kDefaultValue_ParamA );
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SetParameter(kParam_B, kDefaultValue_ParamB );
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SetParameter(kParam_C, kDefaultValue_ParamC );
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SetParameter(kParam_D, kDefaultValue_ParamD );
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SetParameter(kParam_E, kDefaultValue_ParamE );
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SetParameter(kParam_F, kDefaultValue_ParamF );
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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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// ZAcidLowpass::GetParameterValueStrings
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult ZAcidLowpass::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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// ZAcidLowpass::GetParameterInfo
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult ZAcidLowpass::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_A:
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AUBase::FillInParameterName (outParameterInfo, kParameterAName, 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_ParamA;
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break;
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case kParam_B:
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AUBase::FillInParameterName (outParameterInfo, kParameterBName, 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_ParamB;
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break;
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case kParam_C:
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AUBase::FillInParameterName (outParameterInfo, kParameterCName, 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_ParamC;
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break;
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case kParam_D:
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AUBase::FillInParameterName (outParameterInfo, kParameterDName, 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_ParamD;
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break;
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case kParam_E:
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AUBase::FillInParameterName (outParameterInfo, kParameterEName, 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_ParamE;
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break;
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case kParam_F:
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AUBase::FillInParameterName (outParameterInfo, kParameterFName, 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_ParamF;
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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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// ZAcidLowpass::GetPropertyInfo
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult ZAcidLowpass::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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// ZAcidLowpass::GetProperty
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult ZAcidLowpass::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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// ZAcidLowpass::Initialize
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult ZAcidLowpass::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 ____ZAcidLowpassEffectKernel
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// ZAcidLowpass::ZAcidLowpassKernel::Reset()
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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void ZAcidLowpass::ZAcidLowpassKernel::Reset()
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{
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for (int x = 0; x < bez_total; x++) {bezA[x] = 0.0;}
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bezA[bez_cycle] = 1.0;
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for (int x = 0; x < 11; x++) {biquadE[x] = 0.0; biquadF[x] = 0.0;}
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iirSampleA = 0.0;
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cutoffA = 0.5; cutoffB = 0.5;
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overA = 0.0; overB = 0.0;
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underA = 1.0; underB = 1.0;
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meltdownA = 0.0; meltdownB = 0.0;
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inTrimA = 0.1; inTrimB = 0.1;
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outTrimA = 1.0; outTrimB = 1.0;
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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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// ZAcidLowpass::ZAcidLowpassKernel::Process
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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void ZAcidLowpass::ZAcidLowpassKernel::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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cutoffA = cutoffB;
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cutoffB = pow(GetParameter( kParam_A ),3.0)/overallscale;
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cutoffB /= (2.0/pow(overallscale,0.5-((overallscale-1.0)*0.0375)));
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if (cutoffB < 0.0001) cutoffB = 0.0001; if (cutoffB > 1.0) cutoffB = 1.0;
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overA = overB;
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overB = GetParameter( kParam_B );
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underA = underB;
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underB = GetParameter( kParam_C );
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meltdownA = meltdownB;
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meltdownB = GetParameter( kParam_D );
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//opamp stuff
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inTrimA = inTrimB;
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inTrimB = GetParameter( kParam_E )*10.0;
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inTrimB *= inTrimB; inTrimB *= inTrimB;
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outTrimA = outTrimB;
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outTrimB = GetParameter( kParam_F );
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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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double K = tan(M_PI * biquadE[0]); //lowpass
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double 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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while (nSampleFrames-- > 0) {
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double inputSampleL = *sourceP;
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if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpd * 1.18e-17;
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double temp = (double)nSampleFrames/inFramesToProcess;
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double cutoff = (cutoffA*temp)+(cutoffB*(1.0-temp));
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double over = (overA*temp)+(overB*(1.0-temp));
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double under = (underA*temp)+(underB*(1.0-temp));
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double meltdown = (meltdownA*temp)+(meltdownB*(1.0-temp));
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double inTrim = (inTrimA*temp)+(inTrimB*(1.0-temp));
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double outTrim = (outTrimA*temp)+(outTrimB*(1.0-temp));
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double acidTrim = 1.0-pow(cutoff*0.5,1.0/(cutoff*0.5));
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bezA[bez_cycle] += cutoff;
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bezA[bez_SampL] += (inputSampleL * cutoff);
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if (bezA[bez_cycle] > 1.0) { //hit the end point and we do a reverb sample
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bezA[bez_cycle] -= 1.0;
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bezA[bez_DL] = bezA[bez_CL];
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bezA[bez_CL] = bezA[bez_BL];
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bezA[bez_BL] = bezA[bez_AL];
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bezA[bez_AL] = (bezA[bez_SampL]*(1.0-meltdown))+(inputSampleL*meltdown);
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bezA[bez_SampL] = 0.0;
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}
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double X = bezA[bez_cycle]*acidTrim;
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double midL = bezA[bez_DL] * pow(1.0-X,3.0);
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midL += bezA[bez_CL] * 3.0 * pow(1.0-X,2.0) * X;
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midL += bezA[bez_BL] * 3.0 * (1.0-X) * X * X;
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midL += bezA[bez_AL] * pow(X,3.0);
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inputSampleL = (midL*under) + ((inputSampleL - midL)*over);
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if (inTrim != 1.0) inputSampleL *= inTrim;
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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)) + (inputSampleL * iirAmountA);
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inputSampleL -= iirSampleA;
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double outSample = biquadE[2]*inputSampleL+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] = inputSampleL; inputSampleL = outSample; biquadE[10] = biquadE[9]; biquadE[9] = inputSampleL; //DF1
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if (inputSampleL > 1.0) inputSampleL = 1.0; if (inputSampleL < -1.0) inputSampleL = -1.0;
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inputSampleL -= (inputSampleL*inputSampleL*inputSampleL*inputSampleL*inputSampleL*0.1768);
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outSample = biquadF[2]*inputSampleL+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] = inputSampleL; inputSampleL = outSample; biquadF[10] = biquadF[9]; biquadF[9] = inputSampleL; //DF1
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if (outTrim != 1.0) inputSampleL *= outTrim;
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//end opamp stage
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//begin 32 bit floating point dither
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int expon; frexpf((float)inputSampleL, &expon);
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fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
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inputSampleL += ((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 = inputSampleL;
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sourceP += inNumChannels; destP += inNumChannels;
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}
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}
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