/*
*	File:		YNotNotch.cpp
*	
*	Version:	1.0
* 
*	Created:	9/21/23
*	
*	Copyright:  Copyright © 2023 Airwindows, Airwindows uses the MIT license
* 
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/*=============================================================================
	YNotNotch.cpp
	
=============================================================================*/
#include "YNotNotch.h"


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

COMPONENT_ENTRY(YNotNotch)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	YNotNotch::YNotNotch
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
YNotNotch::YNotNotch(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 );
	SetParameter(kParam_Six, kDefaultValue_ParamSix );
         
#if AU_DEBUG_DISPATCHER
	mDebugDispatcher = new AUDebugDispatcher (this);
#endif
	
}


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



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	YNotNotch::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			YNotNotch::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;
           case kParam_Six:
                AUBase::FillInParameterName (outParameterInfo, kParameterSixName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamSix;
                break;
           default:
                result = kAudioUnitErr_InvalidParameter;
                break;
            }
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    


	return result;
}

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

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

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

#pragma mark ____YNotNotchEffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	YNotNotch::YNotNotchKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		YNotNotch::YNotNotchKernel::Reset()
{
	for (int x = 0; x < biq_total; x++) {biquad[x] = 0.0;}
	for (int x = 0; x < fix_total; x++) {fixA[x] = 0.0; fixB[x] = 0.0;}
	fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	YNotNotch::YNotNotchKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		YNotNotch::YNotNotchKernel::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;
	
	biquad[biq_freq] = pow(GetParameter( kParam_Two ),3)*20000.0;
	if (biquad[biq_freq] < 15.0) biquad[biq_freq] = 15.0;
	biquad[biq_freq] /= GetSampleRate();
    biquad[biq_reso] = (pow(GetParameter( kParam_Three ),2)*15.0)+0.0001;
	double K = tan(M_PI * biquad[biq_freq]);
	double norm = 1.0 / (1.0 + K / biquad[biq_reso] + K * K);
	biquad[biq_a0] = (1.0 + K * K) * norm;
	biquad[biq_a1] = 2.0 * (K * K - 1) * norm;
	biquad[biq_a2] = biquad[biq_a0];
	biquad[biq_b1] = biquad[biq_a1];
	biquad[biq_b2] = (1.0 - K / biquad[biq_reso] + K * K) * norm;
	//for the coefficient-interpolated biquad filter
	
	double powFactor = pow(GetParameter( kParam_Four )+0.9,4);
	
	//1.0 == target neutral
	
	double outTrim = GetParameter( kParam_Five );
	
	double wet = GetParameter( kParam_Six );
	
	fixA[fix_freq] = fixB[fix_freq] = 20000.0 / GetSampleRate();
    fixA[fix_reso] = fixB[fix_reso] = 0.7071; //butterworth Q
	
	K = tan(M_PI * fixA[fix_freq]);
	norm = 1.0 / (1.0 + K / fixA[fix_reso] + K * K);
	fixA[fix_a0] = fixB[fix_a0] = K * K * norm;
	fixA[fix_a1] = fixB[fix_a1] = 2.0 * fixA[fix_a0];
	fixA[fix_a2] = fixB[fix_a2] = fixA[fix_a0];
	fixA[fix_b1] = fixB[fix_b1] = 2.0 * (K * K - 1.0) * norm;
	fixA[fix_b2] = fixB[fix_b2] = (1.0 - K / fixA[fix_reso] + K * K) * norm;
	//for the fixed-position biquad filter
	
	while (nSampleFrames-- > 0) {
		double inputSample = *sourceP;
		if (fabs(inputSample)<1.18e-23) inputSample = fpd * 1.18e-17;
		double drySample = *sourceP;
		
		inputSample *= inTrim;
		
		double temp = (inputSample * fixA[fix_a0]) + fixA[fix_sL1];
		fixA[fix_sL1] = (inputSample * fixA[fix_a1]) - (temp * fixA[fix_b1]) + fixA[fix_sL2];
		fixA[fix_sL2] = (inputSample * fixA[fix_a2]) - (temp * fixA[fix_b2]);
		inputSample = temp; //fixed biquad filtering ultrasonics
		
		//encode/decode courtesy of torridgristle under the MIT license
		if (inputSample > 1.0) inputSample = 1.0;
		else if (inputSample > 0.0) inputSample = 1.0 - pow(1.0-inputSample,powFactor);
		if (inputSample < -1.0) inputSample = -1.0;
		else if (inputSample < 0.0) inputSample = -1.0 + pow(1.0+inputSample,powFactor);
		
		temp = (inputSample * biquad[biq_a0]) + biquad[biq_sL1];
		biquad[biq_sL1] =  (inputSample * biquad[biq_a1]) - (temp * biquad[biq_b1]) + biquad[biq_sL2];
		biquad[biq_sL2] = (inputSample * biquad[biq_a2]) - (temp * biquad[biq_b2]);
		inputSample = temp; //coefficient interpolating biquad filter
		
		//encode/decode courtesy of torridgristle under the MIT license
		if (inputSample > 1.0) inputSample = 1.0;
		else if (inputSample > 0.0) inputSample = 1.0 - pow(1.0-inputSample,(1.0/powFactor));
		if (inputSample < -1.0) inputSample = -1.0;
		else if (inputSample < 0.0) inputSample = -1.0 + pow(1.0+inputSample,(1.0/powFactor));
		
		inputSample *= outTrim;
		
		temp = (inputSample * fixB[fix_a0]) + fixB[fix_sL1];
		fixB[fix_sL1] = (inputSample * fixB[fix_a1]) - (temp * fixB[fix_b1]) + fixB[fix_sL2];
		fixB[fix_sL2] = (inputSample * fixB[fix_a2]) - (temp * fixB[fix_b2]);
		inputSample = temp; //fixed biquad filtering ultrasonics
		
		if (wet < 1.0) {
			inputSample = (inputSample*wet) + (drySample*(1.0-wet));
		}
		
		//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;
	}
}

