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359 lines
14 KiB
C++
359 lines
14 KiB
C++
/*
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* File: StereoChorus.cpp
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*
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* Version: 1.0
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*
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* Created: 2/7/22
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*
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* Copyright: Copyright © 2022 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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StereoChorus.cpp
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=============================================================================*/
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#include "StereoChorus.h"
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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COMPONENT_ENTRY(StereoChorus)
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// StereoChorus::StereoChorus
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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StereoChorus::StereoChorus(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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#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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// StereoChorus::GetParameterValueStrings
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult StereoChorus::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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// StereoChorus::GetParameterInfo
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult StereoChorus::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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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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// StereoChorus::GetPropertyInfo
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult StereoChorus::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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// state that plugin supports only stereo-in/stereo-out processing
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UInt32 StereoChorus::SupportedNumChannels(const AUChannelInfo ** outInfo)
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{
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if (outInfo != NULL)
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{
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static AUChannelInfo info;
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info.inChannels = 2;
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info.outChannels = 2;
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*outInfo = &info;
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}
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return 1;
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}
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// StereoChorus::GetProperty
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult StereoChorus::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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// StereoChorus::Initialize
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult StereoChorus::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 ____StereoChorusEffectKernel
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// StereoChorus::StereoChorusKernel::Reset()
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult StereoChorus::Reset(AudioUnitScope inScope, AudioUnitElement inElement)
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{
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for(int count = 0; count < 65535; count++) {pL[count] = 0;pR[count] = 0;}
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sweepL = 3.141592653589793238 / 2.7;
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sweepR = 3.141592653589793238;
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gcount = 0;
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airPrevL = 0.0;
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airEvenL = 0.0;
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airOddL = 0.0;
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airFactorL = 0.0;
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airPrevR = 0.0;
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airEvenR = 0.0;
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airOddR = 0.0;
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airFactorR = 0.0;
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flip = false;
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for(int count = 0; count < 6; count++) {lastRefL[count] = 0.0;lastRefR[count] = 0.0;}
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cycle = 0;
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fpdL = 1.0; while (fpdL < 16386) fpdL = rand()*UINT32_MAX;
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fpdR = 1.0; while (fpdR < 16386) fpdR = rand()*UINT32_MAX;
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return noErr;
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}
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// StereoChorus::ProcessBufferLists
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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OSStatus StereoChorus::ProcessBufferLists(AudioUnitRenderActionFlags & ioActionFlags,
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const AudioBufferList & inBuffer,
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AudioBufferList & outBuffer,
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UInt32 inFramesToProcess)
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{
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Float32 * inputL = (Float32*)(inBuffer.mBuffers[0].mData);
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Float32 * inputR = (Float32*)(inBuffer.mBuffers[1].mData);
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Float32 * outputL = (Float32*)(outBuffer.mBuffers[0].mData);
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Float32 * outputR = (Float32*)(outBuffer.mBuffers[1].mData);
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UInt32 nSampleFrames = inFramesToProcess;
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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 cycleEnd = floor(overallscale);
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if (cycleEnd < 1) cycleEnd = 1;
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if (cycleEnd > 4) cycleEnd = 4;
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//this is going to be 2 for 88.1 or 96k, 3 for silly people, 4 for 176 or 192k
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if (cycle > cycleEnd-1) cycle = cycleEnd-1; //sanity check
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double speed = pow(0.32+(GetParameter( kParam_One )/6),10);
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double depth = (GetParameter( kParam_Two )/60) / speed;
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double tupi = 3.141592653589793238 * 2.0;
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while (nSampleFrames-- > 0) {
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double inputSampleL = *inputL;
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double inputSampleR = *inputR;
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if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpdL * 1.18e-17;
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if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
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cycle++;
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if (cycle == cycleEnd) { //hit the end point and we do a chorus sample
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//assign working variables
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airFactorL = airPrevL - inputSampleL;
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if (flip) {airEvenL += airFactorL; airOddL -= airFactorL; airFactorL = airEvenL;}
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else {airOddL += airFactorL; airEvenL -= airFactorL; airFactorL = airOddL;}
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airOddL = (airOddL - ((airOddL - airEvenL)/256.0)) / 1.0001;
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airEvenL = (airEvenL - ((airEvenL - airOddL)/256.0)) / 1.0001;
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airPrevL = inputSampleL;
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inputSampleL += airFactorL;
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//left
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airFactorR = airPrevR - inputSampleR;
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if (flip) {airEvenR += airFactorR; airOddR -= airFactorR; airFactorR = airEvenR;}
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else {airOddR += airFactorR; airEvenR -= airFactorR; airFactorR = airOddR;}
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airOddR = (airOddR - ((airOddR - airEvenR)/256.0)) / 1.0001;
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airEvenR = (airEvenR - ((airEvenR - airOddR)/256.0)) / 1.0001;
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airPrevR = inputSampleR;
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inputSampleR += airFactorR;
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//right
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flip = !flip;
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//air, compensates for loss of highs in flanger's interpolation
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int tempL = 0;
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int tempR = 0;
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if (gcount < 1 || gcount > 32760) {gcount = 32760;}
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int count = gcount;
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pL[count+32760] = pL[count] = (int)(inputSampleL*8388352.0);
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//double buffer -8388352 to 8388352 is equal to 24 bit linear space
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double offset = depth + (depth * sin(sweepL));
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count += (int)floor(offset);
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tempL += (int)(pL[count] * (1-(offset-floor(offset)))); //less as value moves away from .0
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tempL += pL[count+1]; //we can assume always using this in one way or another?
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tempL += (int)(pL[count+2] * (offset-floor(offset))); //greater as value moves away from .0
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tempL -= (int)(((pL[count]-pL[count+1])-(pL[count+1]-pL[count+2]))/50); //interpolation hacks 'r us
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//left
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count = gcount;
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pR[count+32760] = pR[count] = (int)(inputSampleR*8388352.0);
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//double buffer -8388352 to 8388352 is equal to 24 bit linear space
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offset = depth + (depth * sin(sweepR));
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count += (int)floor(offset);
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tempR += (int)(pR[count] * (1-(offset-floor(offset)))); //less as value moves away from .0
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tempR += pR[count+1]; //we can assume always using this in one way or another?
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tempR += (int)(pR[count+2] * (offset-floor(offset))); //greater as value moves away from .0
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tempR -= (int)(((pR[count]-pR[count+1])-(pR[count+1]-pR[count+2]))/50); //interpolation hacks 'r us
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//right
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sweepL += speed;
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sweepR += speed;
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if (sweepL > tupi){sweepL -= tupi;}
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if (sweepR > tupi){sweepR -= tupi;}
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gcount--;
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//still scrolling through the samples, remember
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inputSampleL = ((double)(tempL/16776704.0));
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inputSampleR = ((double)(tempR/16776704.0));
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if (cycleEnd == 4) {
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lastRefL[0] = lastRefL[4]; //start from previous last
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lastRefL[2] = (lastRefL[0] + inputSampleL)/2; //half
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lastRefL[1] = (lastRefL[0] + lastRefL[2])/2; //one quarter
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lastRefL[3] = (lastRefL[2] + inputSampleL)/2; //three quarters
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lastRefL[4] = inputSampleL; //full
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lastRefR[0] = lastRefR[4]; //start from previous last
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lastRefR[2] = (lastRefR[0] + inputSampleR)/2; //half
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lastRefR[1] = (lastRefR[0] + lastRefR[2])/2; //one quarter
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lastRefR[3] = (lastRefR[2] + inputSampleR)/2; //three quarters
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lastRefR[4] = inputSampleR; //full
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}
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if (cycleEnd == 3) {
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lastRefL[0] = lastRefL[3]; //start from previous last
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lastRefL[2] = (lastRefL[0]+lastRefL[0]+inputSampleL)/3; //third
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lastRefL[1] = (lastRefL[0]+inputSampleL+inputSampleL)/3; //two thirds
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lastRefL[3] = inputSampleL; //full
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lastRefR[0] = lastRefR[3]; //start from previous last
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lastRefR[2] = (lastRefR[0]+lastRefR[0]+inputSampleR)/3; //third
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lastRefR[1] = (lastRefR[0]+inputSampleR+inputSampleR)/3; //two thirds
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lastRefR[3] = inputSampleR; //full
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}
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if (cycleEnd == 2) {
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lastRefL[0] = lastRefL[2]; //start from previous last
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lastRefL[1] = (lastRefL[0] + inputSampleL)/2; //half
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lastRefL[2] = inputSampleL; //full
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lastRefR[0] = lastRefR[2]; //start from previous last
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lastRefR[1] = (lastRefR[0] + inputSampleR)/2; //half
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lastRefR[2] = inputSampleR; //full
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}
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if (cycleEnd == 1) {
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lastRefL[0] = inputSampleL;
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lastRefR[0] = inputSampleR;
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}
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cycle = 0; //reset
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inputSampleL = lastRefL[cycle];
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inputSampleR = lastRefR[cycle];
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} else {
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inputSampleL = lastRefL[cycle];
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inputSampleR = lastRefR[cycle];
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//we are going through our references now
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}
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//begin 32 bit stereo floating point dither
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int expon; frexpf((float)inputSampleL, &expon);
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fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
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inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
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frexpf((float)inputSampleR, &expon);
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fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
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inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
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//end 32 bit stereo floating point dither
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*outputL = inputSampleL;
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*outputR = inputSampleR;
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//direct stereo out
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inputL += 1;
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inputR += 1;
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outputL += 1;
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outputR += 1;
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}
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return noErr;
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}
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