/*
*	File:		MackEQ.cpp
*	
*	Version:	1.0
* 
*	Created:	4/5/21
*	
*	Copyright:  Copyright © 2021 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.
*
*/
/*=============================================================================
	MackEQ.cpp
	
=============================================================================*/
#include "MackEQ.h"


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

AUDIOCOMPONENT_ENTRY(AUBaseFactory, MackEQ)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	MackEQ::MackEQ
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
MackEQ::MackEQ(AudioUnit component)
	: AUEffectBase(component)
{
	CreateElements();
	Globals()->UseIndexedParameters(kNumberOfParameters);
	SetParameter(kParam_One, kDefaultValue_ParamOne );
	SetParameter(kParam_Two, kDefaultValue_ParamTwo );
	SetParameter(kParam_Three, kDefaultValue_ParamThree );
	SetParameter(kParam_Four, kDefaultValue_ParamFour );
	SetParameter(kParam_Five, kDefaultValue_ParamFive );
         
#if AU_DEBUG_DISPATCHER
	mDebugDispatcher = new AUDebugDispatcher (this);
#endif
	
}


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



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

	outParameterInfo.flags = 	kAudioUnitParameterFlag_IsWritable
						|		kAudioUnitParameterFlag_IsReadable;
    
    if (inScope == kAudioUnitScope_Global) {
        switch(inParameterID)
        {
           case kParam_One:
                AUBase::FillInParameterName (outParameterInfo, kParameterOneName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamOne;
                break;
            case kParam_Two:
                AUBase::FillInParameterName (outParameterInfo, kParameterTwoName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamTwo;
                break;
            case kParam_Three:
                AUBase::FillInParameterName (outParameterInfo, kParameterThreeName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamThree;
                break;
           case kParam_Four:
                AUBase::FillInParameterName (outParameterInfo, kParameterFourName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamFour;
                break;
           case kParam_Five:
                AUBase::FillInParameterName (outParameterInfo, kParameterFiveName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamFive;
                break;
           default:
                result = kAudioUnitErr_InvalidParameter;
                break;
            }
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    


	return result;
}

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

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

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

#pragma mark ____MackEQEffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	MackEQ::MackEQKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		MackEQ::MackEQKernel::Reset()
{
	iirSampleA = 0.0;
	iirSampleB = 0.0;
	iirSampleC = 0.0;
	iirSampleD = 0.0;
	iirSampleE = 0.0;
	iirSampleF = 0.0;
	for (int x = 0; x < 11; x++) {biquadA[x] = 0.0; biquadB[x] = 0.0; biquadC[x] = 0.0; biquadD[x] = 0.0;}
	fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	MackEQ::MackEQKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		MackEQ::MackEQKernel::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();
	
	double inTrim = GetParameter( kParam_One )*10.0;
	inTrim *= inTrim;
	
	double gainHigh = pow(GetParameter( kParam_Two ),2)*4.0;
	double outHigh = sqrt(GetParameter( kParam_Two ));
	double gainBass = pow(GetParameter( kParam_Three ),2)*4.0;
	double outBass = sqrt(GetParameter( kParam_Three ));
	double outPad = GetParameter( kParam_Four );
	double wet = GetParameter( kParam_Five );
	
	double iirAmountA = 0.001860867/overallscale;
	double iirAmountB = 0.000287496/overallscale;
	double iirBassMid = 0.159/overallscale;
	double iirMidHigh = 0.236/overallscale;
	
	biquadD[0] = biquadC[0] = biquadB[0] = biquadA[0] = 19160.0 / GetSampleRate();
    biquadA[1] = 0.431684981684982;
	biquadB[1] = 1.1582298;
	biquadC[1] = 0.657027382751269;
	biquadD[1] = 1.076210852946577;
	
	double K = tan(M_PI * biquadA[0]); //lowpass
	double norm = 1.0 / (1.0 + K / biquadA[1] + K * K);
	biquadA[2] = K * K * norm;
	biquadA[3] = 2.0 * biquadA[2];
	biquadA[4] = biquadA[2];
	biquadA[5] = 2.0 * (K * K - 1.0) * norm;
	biquadA[6] = (1.0 - K / biquadA[1] + K * K) * norm;
	
	K = tan(M_PI * biquadB[0]);
	norm = 1.0 / (1.0 + K / biquadB[1] + K * K);
	biquadB[2] = K * K * norm;
	biquadB[3] = 2.0 * biquadB[2];
	biquadB[4] = biquadB[2];
	biquadB[5] = 2.0 * (K * K - 1.0) * norm;
	biquadB[6] = (1.0 - K / biquadB[1] + K * K) * norm;
	
	K = tan(M_PI * biquadC[0]);
	norm = 1.0 / (1.0 + K / biquadC[1] + K * K);
	biquadC[2] = K * K * norm;
	biquadC[3] = 2.0 * biquadC[2];
	biquadC[4] = biquadC[2];
	biquadC[5] = 2.0 * (K * K - 1.0) * norm;
	biquadC[6] = (1.0 - K / biquadC[1] + K * K) * norm;
	
	K = tan(M_PI * biquadD[0]);
	norm = 1.0 / (1.0 + K / biquadD[1] + K * K);
	biquadD[2] = K * K * norm;
	biquadD[3] = 2.0 * biquadD[2];
	biquadD[4] = biquadD[2];
	biquadD[5] = 2.0 * (K * K - 1.0) * norm;
	biquadD[6] = (1.0 - K / biquadD[1] + K * K) * norm;
		
	while (nSampleFrames-- > 0) {
		double inputSample = *sourceP;
		if (fabs(inputSample)<1.18e-23) inputSample = fpd * 1.18e-17;
		double drySample = inputSample;

		if (fabs(iirSampleA)<1.18e-37) iirSampleA = 0.0;
		iirSampleA = (iirSampleA * (1.0 - iirAmountA)) + (inputSample * iirAmountA);
		inputSample -= iirSampleA;
		
		if (inTrim != 1.0) inputSample *= inTrim;
		
		//begin Mackity input stage
		double outSample = biquadA[2]*inputSample+biquadA[3]*biquadA[7]+biquadA[4]*biquadA[8]-biquadA[5]*biquadA[9]-biquadA[6]*biquadA[10];
		biquadA[8] = biquadA[7]; biquadA[7] = inputSample; inputSample = outSample; biquadA[10] = biquadA[9]; biquadA[9] = inputSample; //DF1		
		
		if (inputSample > 1.0) inputSample = 1.0;
		if (inputSample < -1.0) inputSample = -1.0;
		inputSample -= pow(inputSample,5)*0.1768;
		
		outSample = biquadB[2]*inputSample+biquadB[3]*biquadB[7]+biquadB[4]*biquadB[8]-biquadB[5]*biquadB[9]-biquadB[6]*biquadB[10];
		biquadB[8] = biquadB[7]; biquadB[7] = inputSample; inputSample = outSample; biquadB[10] = biquadB[9]; biquadB[9] = inputSample; //DF1
		
		if (fabs(iirSampleB)<1.18e-37) iirSampleB = 0.0;
		iirSampleB = (iirSampleB * (1.0 - iirAmountB)) + (inputSample * iirAmountB);
		inputSample -= iirSampleB;
		//end Mackity input stage
		
		//begin EQ section
		if (fabs(iirSampleC)<1.18e-37) iirSampleC = 0.0;
		iirSampleC = (iirSampleC * (1.0 - iirBassMid)) + (inputSample * iirBassMid);
		
		double bassSample = iirSampleC;
		double midSample = inputSample - bassSample;

		if (gainBass != 1.0) bassSample *= gainBass;
		if (bassSample > 1.0) bassSample = 1.0;
		if (bassSample < -1.0) bassSample = -1.0;
		bassSample -= pow(bassSample,5)*0.1768;
		
		if (fabs(iirSampleD)<1.18e-37) iirSampleD = 0.0;
		iirSampleD = (iirSampleD * (1.0 - iirBassMid)) + (bassSample * iirBassMid);
		bassSample = iirSampleD;
		//we've taken the bass sample, made the mids from it, distorted it
		//and hit it with another pole of darkening.
		//mid sample is still normal from undistorted bass
		
		if (fabs(iirSampleE)<1.18e-37) iirSampleE = 0.0;
		iirSampleE = (iirSampleE * (1.0 - iirMidHigh)) + (midSample * iirMidHigh);
		double highSample = midSample - iirSampleE;
		midSample = iirSampleE;
		//here is where we make the high sample out of the mid, and take highs
		//away from the mid.
		
		if (fabs(iirSampleF)<1.18e-37) iirSampleF = 0.0;
		iirSampleF = (iirSampleF * (1.0 - iirMidHigh)) + (highSample * iirMidHigh);
		highSample -= iirSampleF;
		
		if (gainHigh != 1.0) highSample *= gainHigh;
		if (highSample > 1.0) highSample = 1.0;
		if (highSample < -1.0) highSample = -1.0;
		highSample -= pow(highSample,5)*0.1768;
		//highpassing HighSample another stage, before distorting it
		
		inputSample = ((bassSample*outBass) + midSample + (highSample*outHigh))*4.0;
		//end EQ section
		
		outSample = biquadC[2]*inputSample+biquadC[3]*biquadC[7]+biquadC[4]*biquadC[8]-biquadC[5]*biquadC[9]-biquadC[6]*biquadC[10];
		biquadC[8] = biquadC[7]; biquadC[7] = inputSample; inputSample = outSample; biquadC[10] = biquadC[9]; biquadC[9] = inputSample; //DF1
		
		if (inputSample > 1.0) inputSample = 1.0;
		if (inputSample < -1.0) inputSample = -1.0;
		inputSample -= pow(inputSample,5)*0.1768;
		
		outSample = biquadD[2]*inputSample+biquadD[3]*biquadD[7]+biquadD[4]*biquadD[8]-biquadD[5]*biquadD[9]-biquadD[6]*biquadD[10];
		biquadD[8] = biquadD[7]; biquadD[7] = inputSample; inputSample = outSample; biquadD[10] = biquadD[9]; biquadD[9] = inputSample; //DF1
				
		if (outPad != 1.0) inputSample *= outPad;

		if (wet !=1.0) {
			inputSample = (inputSample * wet) + (drySample * (1.0-wet));
		}
		//Dry/Wet control, defaults to the last slider

		//begin 32 bit floating point dither
		int expon; frexpf((float)inputSample, &expon);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		inputSample += ((double(fpd)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
		//end 32 bit floating point dither
		
		*destP = inputSample;
		
		sourceP += inNumChannels; destP += inNumChannels;
	}
}

