/*
*	File:		TapeHack2.cpp
*	
*	Version:	1.0
* 
*	Created:	1/8/26
*	
*	Copyright:  Copyright © 2026 Airwindows, Airwindows uses the MIT license
* 
*	Disclaimer:	IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc. ("Apple") in 
*				consideration of your agreement to the following terms, and your use, installation, modification 
*				or redistribution of this Apple software constitutes acceptance of these terms.  If you do 
*				not agree with these terms, please do not use, install, modify or redistribute this Apple 
*				software.
*
*				In consideration of your agreement to abide by the following terms, and subject to these terms, 
*				Apple grants you a personal, non-exclusive license, under Apple's copyrights in this 
*				original Apple software (the "Apple Software"), to use, reproduce, modify and redistribute the 
*				Apple Software, with or without modifications, in source and/or binary forms; provided that if you 
*				redistribute the Apple Software in its entirety and without modifications, you must retain this 
*				notice and the following text and disclaimers in all such redistributions of the Apple Software. 
*				Neither the name, trademarks, service marks or logos of Apple Computer, Inc. may be used to 
*				endorse or promote products derived from the Apple Software without specific prior written 
*				permission from Apple.  Except as expressly stated in this notice, no other rights or 
*				licenses, express or implied, are granted by Apple herein, including but not limited to any 
*				patent rights that may be infringed by your derivative works or by other works in which the 
*				Apple Software may be incorporated.
*
*				The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO WARRANTIES, EXPRESS OR 
*				IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY 
*				AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE 
*				OR IN COMBINATION WITH YOUR PRODUCTS.
*
*				IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL 
*				DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 
*				OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, 
*				REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER 
*				UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN 
*				IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/*=============================================================================
	TapeHack2.cpp
	
=============================================================================*/
#include "TapeHack2.h"


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

COMPONENT_ENTRY(TapeHack2)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	TapeHack2::TapeHack2
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
TapeHack2::TapeHack2(AudioUnit component)
	: AUEffectBase(component)
{
	CreateElements();
	Globals()->UseIndexedParameters(kNumberOfParameters);
	SetParameter(kParam_A, kDefaultValue_ParamA );
	SetParameter(kParam_B, kDefaultValue_ParamB );
	SetParameter(kParam_C, kDefaultValue_ParamC );
         
#if AU_DEBUG_DISPATCHER
	mDebugDispatcher = new AUDebugDispatcher (this);
#endif
	
}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	TapeHack2::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			TapeHack2::GetParameterValueStrings(AudioUnitScope		inScope,
                                                                AudioUnitParameterID	inParameterID,
                                                                CFArrayRef *		outStrings)
{
        
    return kAudioUnitErr_InvalidProperty;
}



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	TapeHack2::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			TapeHack2::GetParameterInfo(AudioUnitScope		inScope,
                                                        AudioUnitParameterID	inParameterID,
                                                        AudioUnitParameterInfo	&outParameterInfo )
{
	ComponentResult result = noErr;

	outParameterInfo.flags = 	kAudioUnitParameterFlag_IsWritable
						|		kAudioUnitParameterFlag_IsReadable;
    
    if (inScope == kAudioUnitScope_Global) {
        switch(inParameterID)
        {
            case kParam_A:
                AUBase::FillInParameterName (outParameterInfo, kParameterAName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamA;
                break;
            case kParam_B:
                AUBase::FillInParameterName (outParameterInfo, kParameterBName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamB;
                break;
            case kParam_C:
                AUBase::FillInParameterName (outParameterInfo, kParameterCName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamC;
                break;
			default:
                result = kAudioUnitErr_InvalidParameter;
                break;
            }
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    


	return result;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	TapeHack2::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			TapeHack2::GetPropertyInfo (AudioUnitPropertyID	inID,
                                                        AudioUnitScope		inScope,
                                                        AudioUnitElement	inElement,
                                                        UInt32 &		outDataSize,
                                                        Boolean &		outWritable)
{
	return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	TapeHack2::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			TapeHack2::GetProperty(	AudioUnitPropertyID inID,
                                                        AudioUnitScope 		inScope,
                                                        AudioUnitElement 	inElement,
                                                        void *			outData )
{
	return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}

//	TapeHack2::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult TapeHack2::Initialize()
{
    ComponentResult result = AUEffectBase::Initialize();
    if (result == noErr)
        Reset(kAudioUnitScope_Global, 0);
    return result;
}

#pragma mark ____TapeHack2EffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	TapeHack2::TapeHack2Kernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		TapeHack2::TapeHack2Kernel::Reset()
{
	for (int x = 0; x < 33; x++) {avg32L[x] = 0.0; post32L[x] = 0.0;}
	for (int x = 0; x < 17; x++) {avg16L[x] = 0.0; post16L[x] = 0.0;}
	for (int x = 0; x < 9; x++) {avg8L[x] = 0.0; post8L[x] = 0.0;}
	for (int x = 0; x < 5; x++) {avg4L[x] = 0.0; post4L[x] = 0.0;}
	for (int x = 0; x < 3; x++) {avg2L[x] = 0.0; post2L[x] = 0.0;}
	avgPos = 0;
	lastDarkL = 0.0;
	//preTapeHack
	
	fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	TapeHack2::TapeHack2Kernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		TapeHack2::TapeHack2Kernel::Process(	const Float32 	*inSourceP,
                                                    Float32		 	*inDestP,
                                                    UInt32 			inFramesToProcess,
                                                    UInt32			inNumChannels, 
                                                    bool			&ioSilence )
{
	UInt32 nSampleFrames = inFramesToProcess;
	const Float32 *sourceP = inSourceP;
	Float32 *destP = inDestP;
	double overallscale = 1.0;
	overallscale /= 44100.0;
	overallscale *= GetSampleRate();
	int spacing = floor(overallscale*2.0);
	if (spacing < 2) spacing = 2; if (spacing > 32) spacing = 32;

	double inputGain = GetParameter( kParam_A )*10.0;
	double outputGain = GetParameter( kParam_B )*0.9239;
	double wet = GetParameter( kParam_C );
	
	while (nSampleFrames-- > 0) {
		double inputSampleL = *sourceP;
		if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpd * 1.18e-17;
		double drySampleL = inputSampleL;

		//begin Left
		inputSampleL *= inputGain;
		double darkSampleL = inputSampleL;
		if (avgPos > 31) avgPos = 0;
		if (spacing > 31) {
			avg32L[avgPos] = darkSampleL;
			darkSampleL = 0.0;
			for (int x = 0; x < 32; x++) {darkSampleL += avg32L[x];}
			darkSampleL /= 32.0;
		} if (spacing > 15) {
			avg16L[avgPos%16] = darkSampleL;
			darkSampleL = 0.0;
			for (int x = 0; x < 16; x++) {darkSampleL += avg16L[x];}
			darkSampleL /= 16.0;
		} if (spacing > 7) {
			avg8L[avgPos%8] = darkSampleL;
			darkSampleL = 0.0;
			for (int x = 0; x < 8; x++) {darkSampleL += avg8L[x];}
			darkSampleL /= 8.0;
		} if (spacing > 3) {
			avg4L[avgPos%4] = darkSampleL;
			darkSampleL = 0.0;
			for (int x = 0; x < 4; x++) {darkSampleL += avg4L[x];}
			darkSampleL /= 4.0;
		} if (spacing > 1) {
			avg2L[avgPos%2] = darkSampleL;
			darkSampleL = 0.0;
			for (int x = 0; x < 2; x++) {darkSampleL += avg2L[x];}
			darkSampleL /= 2.0; 
		} //only update after the post-distortion filter stage
		
		double avgSlewL = fmin(fabs(lastDarkL-inputSampleL)*0.12*overallscale,1.0);
		avgSlewL = 1.0-(1.0-avgSlewL*1.0-avgSlewL);
		inputSampleL = (inputSampleL*(1.0-avgSlewL)) + (darkSampleL*avgSlewL);
		lastDarkL = darkSampleL;

		inputSampleL = fmax(fmin(inputSampleL,2.305929007734908),-2.305929007734908);
		double addtwo = inputSampleL * inputSampleL;
		double empower = inputSampleL * addtwo; // inputSampleL to the third power
		inputSampleL -= (empower / 6.0);
		empower *= addtwo; // to the fifth power
		inputSampleL += (empower / 69.0);
		empower *= addtwo; //seventh
		inputSampleL -= (empower / 2530.08);
		empower *= addtwo; //ninth
		inputSampleL += (empower / 224985.6);
		empower *= addtwo; //eleventh
		inputSampleL -= (empower / 9979200.0f);
		//this is a degenerate form of a Taylor Series to approximate sin()
		
		darkSampleL = inputSampleL;
		if (avgPos > 31) avgPos = 0;
		if (spacing > 31) {
			post32L[avgPos] = darkSampleL;
			darkSampleL = 0.0;
			for (int x = 0; x < 32; x++) {darkSampleL += post32L[x];}
			darkSampleL /= 32.0;
		} if (spacing > 15) {
			post16L[avgPos%16] = darkSampleL;
			darkSampleL = 0.0;
			for (int x = 0; x < 16; x++) {darkSampleL += post16L[x];}
			darkSampleL /= 16.0;
		} if (spacing > 7) {
			post8L[avgPos%8] = darkSampleL;
			darkSampleL = 0.0;
			for (int x = 0; x < 8; x++) {darkSampleL += post8L[x];}
			darkSampleL /= 8.0;
		} if (spacing > 3) {
			post4L[avgPos%4] = darkSampleL;
			darkSampleL = 0.0;
			for (int x = 0; x < 4; x++) {darkSampleL += post4L[x];}
			darkSampleL /= 4.0;
		} if (spacing > 1) {
			post2L[avgPos%2] = darkSampleL;
			darkSampleL = 0.0;
			for (int x = 0; x < 2; x++) {darkSampleL += post2L[x];}
			darkSampleL /= 2.0; 
		} avgPos++;
		inputSampleL = (inputSampleL*(1.0-avgSlewL)) + (darkSampleL*avgSlewL);
		//use the previously calculated depth of the filter
		
		inputSampleL = (inputSampleL * outputGain * wet) + (drySampleL * (1.0-wet));
		//end Left
		
		//begin 32 bit floating point dither
		int expon; frexpf((float)inputSampleL, &expon);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		inputSampleL += ((double(fpd)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
		//end 32 bit floating point dither
		
		*destP = inputSampleL;
		
		sourceP += inNumChannels; destP += inNumChannels;
	}
}

