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311 lines
13 KiB
C++
Executable file
311 lines
13 KiB
C++
Executable file
/*
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* File: TapeHack2.cpp
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*
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* Version: 1.0
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*
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* Created: 1/8/26
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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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TapeHack2.cpp
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=============================================================================*/
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#include "TapeHack2.h"
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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COMPONENT_ENTRY(TapeHack2)
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// TapeHack2::TapeHack2
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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TapeHack2::TapeHack2(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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#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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// TapeHack2::GetParameterValueStrings
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult TapeHack2::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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// TapeHack2::GetParameterInfo
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult TapeHack2::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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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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// TapeHack2::GetPropertyInfo
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult TapeHack2::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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// TapeHack2::GetProperty
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult TapeHack2::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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// TapeHack2::Initialize
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult TapeHack2::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 ____TapeHack2EffectKernel
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// TapeHack2::TapeHack2Kernel::Reset()
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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void TapeHack2::TapeHack2Kernel::Reset()
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{
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for (int x = 0; x < 33; x++) {avg32L[x] = 0.0; post32L[x] = 0.0;}
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for (int x = 0; x < 17; x++) {avg16L[x] = 0.0; post16L[x] = 0.0;}
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for (int x = 0; x < 9; x++) {avg8L[x] = 0.0; post8L[x] = 0.0;}
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for (int x = 0; x < 5; x++) {avg4L[x] = 0.0; post4L[x] = 0.0;}
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for (int x = 0; x < 3; x++) {avg2L[x] = 0.0; post2L[x] = 0.0;}
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avgPos = 0;
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lastDarkL = 0.0;
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//preTapeHack
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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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// TapeHack2::TapeHack2Kernel::Process
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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void TapeHack2::TapeHack2Kernel::Process( const Float32 *inSourceP,
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Float32 *inDestP,
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UInt32 inFramesToProcess,
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UInt32 inNumChannels,
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bool &ioSilence )
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{
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UInt32 nSampleFrames = inFramesToProcess;
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const Float32 *sourceP = inSourceP;
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Float32 *destP = inDestP;
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double overallscale = 1.0;
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overallscale /= 44100.0;
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overallscale *= GetSampleRate();
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int spacing = floor(overallscale*2.0);
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if (spacing < 2) spacing = 2; if (spacing > 32) spacing = 32;
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double inputGain = GetParameter( kParam_A )*10.0;
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double outputGain = GetParameter( kParam_B )*0.9239;
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double wet = GetParameter( kParam_C );
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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 drySampleL = inputSampleL;
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//begin Left
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inputSampleL *= inputGain;
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double darkSampleL = inputSampleL;
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if (avgPos > 31) avgPos = 0;
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if (spacing > 31) {
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avg32L[avgPos] = darkSampleL;
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darkSampleL = 0.0;
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for (int x = 0; x < 32; x++) {darkSampleL += avg32L[x];}
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darkSampleL /= 32.0;
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} if (spacing > 15) {
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avg16L[avgPos%16] = darkSampleL;
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darkSampleL = 0.0;
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for (int x = 0; x < 16; x++) {darkSampleL += avg16L[x];}
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darkSampleL /= 16.0;
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} if (spacing > 7) {
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avg8L[avgPos%8] = darkSampleL;
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darkSampleL = 0.0;
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for (int x = 0; x < 8; x++) {darkSampleL += avg8L[x];}
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darkSampleL /= 8.0;
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} if (spacing > 3) {
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avg4L[avgPos%4] = darkSampleL;
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darkSampleL = 0.0;
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for (int x = 0; x < 4; x++) {darkSampleL += avg4L[x];}
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darkSampleL /= 4.0;
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} if (spacing > 1) {
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avg2L[avgPos%2] = darkSampleL;
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darkSampleL = 0.0;
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for (int x = 0; x < 2; x++) {darkSampleL += avg2L[x];}
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darkSampleL /= 2.0;
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} //only update after the post-distortion filter stage
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double avgSlewL = fmin(fabs(lastDarkL-inputSampleL)*0.12*overallscale,1.0);
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avgSlewL = 1.0-(1.0-avgSlewL*1.0-avgSlewL);
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inputSampleL = (inputSampleL*(1.0-avgSlewL)) + (darkSampleL*avgSlewL);
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lastDarkL = darkSampleL;
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inputSampleL = fmax(fmin(inputSampleL,2.305929007734908),-2.305929007734908);
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double addtwo = inputSampleL * inputSampleL;
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double empower = inputSampleL * addtwo; // inputSampleL to the third power
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inputSampleL -= (empower / 6.0);
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empower *= addtwo; // to the fifth power
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inputSampleL += (empower / 69.0);
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empower *= addtwo; //seventh
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inputSampleL -= (empower / 2530.08);
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empower *= addtwo; //ninth
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inputSampleL += (empower / 224985.6);
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empower *= addtwo; //eleventh
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inputSampleL -= (empower / 9979200.0f);
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//this is a degenerate form of a Taylor Series to approximate sin()
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darkSampleL = inputSampleL;
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if (avgPos > 31) avgPos = 0;
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if (spacing > 31) {
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post32L[avgPos] = darkSampleL;
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darkSampleL = 0.0;
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for (int x = 0; x < 32; x++) {darkSampleL += post32L[x];}
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darkSampleL /= 32.0;
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} if (spacing > 15) {
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post16L[avgPos%16] = darkSampleL;
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darkSampleL = 0.0;
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for (int x = 0; x < 16; x++) {darkSampleL += post16L[x];}
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darkSampleL /= 16.0;
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} if (spacing > 7) {
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post8L[avgPos%8] = darkSampleL;
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darkSampleL = 0.0;
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for (int x = 0; x < 8; x++) {darkSampleL += post8L[x];}
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darkSampleL /= 8.0;
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} if (spacing > 3) {
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post4L[avgPos%4] = darkSampleL;
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darkSampleL = 0.0;
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for (int x = 0; x < 4; x++) {darkSampleL += post4L[x];}
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darkSampleL /= 4.0;
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} if (spacing > 1) {
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post2L[avgPos%2] = darkSampleL;
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darkSampleL = 0.0;
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for (int x = 0; x < 2; x++) {darkSampleL += post2L[x];}
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darkSampleL /= 2.0;
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} avgPos++;
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inputSampleL = (inputSampleL*(1.0-avgSlewL)) + (darkSampleL*avgSlewL);
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//use the previously calculated depth of the filter
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inputSampleL = (inputSampleL * outputGain * wet) + (drySampleL * (1.0-wet));
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//end Left
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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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