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399 lines
17 KiB
C++
Executable file
399 lines
17 KiB
C++
Executable file
/*
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* File: GlitchShifter.cpp
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*
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* Version: 1.0
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*
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* Created: 2/19/07
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*
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* Copyright: Copyright © 2007 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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GlitchShifter.h
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=============================================================================*/
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#include "GlitchShifter.h"
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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AUDIOCOMPONENT_ENTRY(AUBaseFactory, GlitchShifter)
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// GlitchShifter::GlitchShifter
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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GlitchShifter::GlitchShifter(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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// GlitchShifter::GetParameterValueStrings
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult GlitchShifter::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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// GlitchShifter::GetParameterInfo
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult GlitchShifter::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_Indexed;
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outParameterInfo.minValue = -12;
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outParameterInfo.maxValue = 12;
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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 = -1.0;
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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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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 = 0.0;
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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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// GlitchShifter::GetPropertyInfo
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult GlitchShifter::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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// GlitchShifter::GetProperty
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult GlitchShifter::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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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// GlitchShifter::Initialize
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult GlitchShifter::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 ____GlitchShifterEffectKernel
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// GlitchShifter::GlitchShifterKernel::Reset()
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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void GlitchShifter::GlitchShifterKernel::Reset()
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{
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for (int count = 0; count < 131074; count++) {p[count] = 0;}
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for (int count = 0; count < 257; count++) {offset[count] = 0; pastzero[count] = 0; previous[count] = 0; third[count] = 0; fourth[count] = 0;}
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gcount = 0;
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crosses = 0;
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realzeroes = 0;
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temp = 0;
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lasttemp = 0;
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thirdtemp = 0;
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fourthtemp = 0;
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lastwidth = 16386;
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sincezerocross = 0;
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airPrev = 0.0;
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airEven = 0.0;
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airOdd = 0.0;
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airFactor = 0.0;
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position = 0.0;
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flip = false;
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splicing = false;
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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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// GlitchShifter::GlitchShifterKernel::Process
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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void GlitchShifter::GlitchShifterKernel::Process( const Float32 *inSourceP,
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Float32 *inDestP,
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UInt32 inFramesToProcess,
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UInt32 inNumChannels, // for version 2 AudioUnits inNumChannels is always 1
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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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Float64 note = GetParameter( kParam_One );
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Float64 trim = GetParameter( kParam_Two );
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Float64 speed = ((1.0/12.0)*note)+trim;
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if (speed < 0) speed *= 0.5;
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//include sanity check- maximum pitch lowering cannot be to 0 hz.
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SInt32 width = (SInt32)(65536-((1-pow(1-GetParameter( kParam_Three ),2))*65530.0));
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Float64 bias = pow(GetParameter( kParam_Three ),3);
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Float64 feedback = GetParameter( kParam_Four )/1.5;
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Float64 wet = GetParameter( kParam_Five );
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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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airFactor = airPrev - inputSample;
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if (flip) {airEven += airFactor; airOdd -= airFactor; airFactor = airEven;}
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else {airOdd += airFactor; airEven -= airFactor; airFactor = airOdd;}
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airOdd = (airOdd - ((airOdd - airEven)/256.0)) / 1.0001;
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airEven = (airEven - ((airEven - airOdd)/256.0)) / 1.0001;
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airPrev = inputSample;
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inputSample += airFactor;
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flip = !flip;
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//air, compensates for loss of highs of interpolation
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if (lastwidth != width){crosses = 0; realzeroes = 0; lastwidth = width;}
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gcount++;
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if (gcount < 0 || gcount > width) {gcount = 0;}
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int count = gcount;
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int countone = count-1;
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int counttwo = count-2;
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while (count < 0){count += width;}
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while (countone < 0){countone += width;}
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while (counttwo < 0){counttwo += width;}
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while (count > width){count -= width;} //this can only happen with very insane variables
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while (countone > width){countone -= width;}
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while (counttwo > width){counttwo -= width;}
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//yay sanity checks
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//now we have counts zero, one, two, none of which have sanity checked values
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//we are tracking most recent samples and must SUBTRACT.
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p[count+width] = p[count] = (SInt32)((inputSample*8388352.0)+(Float64)(lasttemp*feedback));
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//double buffer -8388352 to 8388352 is equal to 24 bit linear space
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if ((p[countone] > 0 && p[count] < 0)||(p[countone] < 0 && p[count] > 0)) //source crossed zero
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{
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crosses++;
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realzeroes++;
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if (crosses > 256) {crosses = 0;} //wrap crosses to keep adding new crosses
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if (realzeroes > 256) {realzeroes = 256;} //don't wrap realzeroes, full buffer, use all
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offset[crosses] = count;
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pastzero[crosses] = p[count];
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previous[crosses] = p[countone];
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third[crosses] = p[counttwo];
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//we load the zero crosses register with crosses to examine
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//the purpose is amassing situations to compare potential zero splice points
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//and switch at the moment the wave angles are most similar
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} //we just put in a source zero cross in the registry
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position -= speed;
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if (position > width) {
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if (realzeroes > 0) { //we just caught up to the buffer end with zero crosses in the bin
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position = 0;
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Float64 diff = 99999999.0;
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int best = 0;
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int scan;
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for(scan = (realzeroes-1); scan >= 0; scan--) {
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int scanone = scan + crosses;
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if (scanone > 256){scanone -= 256;}
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//try to track the real most recent ones more closely
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Float64 howdiff = (Float64)((temp - pastzero[scanone]) + (lasttemp - previous[scanone]) + (thirdtemp - third[scanone]) + (fourthtemp - fourth[scanone]));
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//got difference factor between things
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howdiff -= (Float64)(scan*bias);
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//try to bias in favor of more recent crosses
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if (howdiff < diff) {diff = howdiff; best = scanone;}
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} //now we have 'best' as the closest match to the current rate of zero cross and positioning- a splice.
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position = offset[best]-sincezerocross;
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crosses = 0;
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realzeroes = 0;
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splicing = true; //we just kicked the delay tap back
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} else {
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position -= width; //with no zero crosses in the bin
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crosses = 0;
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realzeroes = 0;
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splicing = true; //so, hard splice it.
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}
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}
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if (position < 0) { //we just caught up to the dry tap
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if (realzeroes > 0) { //we just caught up to the dry tap with zero crosses in the bin
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position = 0;
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Float64 diff = 99999999.0;
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int best = 0;
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int scan;
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for(scan = (realzeroes-1); scan >= 0; scan--) {
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int scanone = scan + crosses;
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if (scanone > 256){scanone -= 256;}
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//try to track the real most recent ones more closely
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Float64 howdiff = (Float64)((temp - pastzero[scanone]) + (lasttemp - previous[scanone]) + (thirdtemp - third[scanone]) + (fourthtemp - fourth[scanone]));
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//got difference factor between things
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howdiff -= (Float64)(scan*bias);
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//try to bias in favor of more recent crosses
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if (howdiff < diff) {diff = howdiff; best = scanone;}
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} //now we have 'best' as the closest match to the current rate of zero cross and positioning- a splice.
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position = offset[best]-sincezerocross;
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crosses = 0;
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realzeroes = 0;
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splicing = true; //we just kicked the delay tap back
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} else {
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position += width; //with no zero crosses in the bin
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crosses = 0;
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realzeroes = 0;
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splicing = true; //so, hard splice it.
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}
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}
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count = gcount - (int)floor(position);
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//we go back because the buffer goes forward this time
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countone = count+1;
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counttwo = count+2;
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//now we have counts zero, one, two, none of which have sanity checked values
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//we are interpolating, we ADD
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while (count < 0){count += width;}
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while (countone < 0){countone += width;}
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while (counttwo < 0){counttwo += width;}
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while (count > width){count -= width;} //this can only happen with very insane variables
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while (countone > width){countone -= width;}
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while (counttwo > width){counttwo -= width;}
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//here's where we do our shift against the rotating buffer
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temp = 0;
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temp += (SInt32)(p[count] * (1-(position-floor(position)))); //less as value moves away from .0
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temp += p[count+1]; //we can assume always using this in one way or another?
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temp += (SInt32)(p[count+2] * (position-floor(position))); //greater as value moves away from .0
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temp -= (SInt32)(((p[count]-p[count+1])-(p[count+1]-p[count+2]))/50); //interpolation hacks 'r us
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temp /= 2; //gotta make temp be the same level scale as buffer
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//now we have our delay tap, which is going to do our pitch shifting
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if (abs(temp) > 8388352.0){temp = (lasttemp + (lasttemp - thirdtemp));}
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//kill ticks of bad buffer mojo by sticking with the trajectory. Ugly hack *shrug*
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sincezerocross++;
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if (sincezerocross < 0 || sincezerocross > width){sincezerocross = 0;} //just a sanity check
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if (splicing){temp = (temp + (lasttemp + (lasttemp - thirdtemp)))/2; splicing = false;}
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//do a smoother transition by taking the sample of transition and going half with it
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if ((lasttemp > 0 && temp < 0)||(lasttemp < 0 && temp > 0)) //delay tap crossed zero
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{
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sincezerocross = 0;
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} //we just restarted counting from the delay tap zero cross
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fourthtemp = thirdtemp;
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thirdtemp = lasttemp;
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lasttemp = temp;
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inputSample = ( *sourceP * (1-wet))+((Float64)(temp/(8388352.0))*wet);
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if (inputSample > 4.0) inputSample = 4.0;
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if (inputSample < -4.0) inputSample = -4.0;
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//this plugin can throw insane outputs so we'll put in a hard clip
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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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destP += inNumChannels;
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sourceP += inNumChannels;
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}
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}
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