/*
*	File:		Calibre.cpp
*	
*	Version:	1.0
* 
*	Created:	1/11/20
*	
*	Copyright:  Copyright © 2020 Airwindows, Airwindows uses the MIT license
* 
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/*=============================================================================
	Calibre.cpp
	
=============================================================================*/
#include "Calibre.h"


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

AUDIOCOMPONENT_ENTRY(AUBaseFactory, Calibre)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Calibre::Calibre
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Calibre::Calibre(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 );
         
#if AU_DEBUG_DISPATCHER
	mDebugDispatcher = new AUDebugDispatcher (this);
#endif
	
}


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



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Calibre::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Calibre::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 = 3.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamTwo;
                break;
            case kParam_Three:
                AUBase::FillInParameterName (outParameterInfo, kParameterThreeName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 3.0;
                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;
			default:
                result = kAudioUnitErr_InvalidParameter;
                break;
            }
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    


	return result;
}

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

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

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

#pragma mark ____CalibreEffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Calibre::CalibreKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		Calibre::CalibreKernel::Reset()
{
	for(int count = 0; count < 34; count++) {b[count] = 0;}
	lastSample = 0.0;
	fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Calibre::CalibreKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		Calibre::CalibreKernel::Process(	const Float32 	*inSourceP,
                                                    Float32		 	*inDestP,
                                                    UInt32 			inFramesToProcess,
                                                    UInt32			inNumChannels, 
                                                    bool			&ioSilence )
{
	UInt32 nSampleFrames = inFramesToProcess;
	const Float32 *sourceP = inSourceP;
	Float32 *destP = inDestP;
	
	Float64 threshold = GetParameter( kParam_One );
	Float64 hardness;
	Float64 breakup = (1.0-(threshold/2.0))*3.14159265358979;
	Float64 bridgerectifier;
	Float64 sqdrive = GetParameter( kParam_Two );
	if (sqdrive > 1.0) sqdrive *= sqdrive;
	sqdrive = sqrt(sqdrive);
	Float64 indrive = GetParameter( kParam_Three );
	if (indrive > 1.0) indrive *= indrive;
	indrive *= (1.0+(0.1935*sqdrive));
	//no gain loss of convolution for APIcolypse
	//calibrate this to match noise level with character at 1.0
	//you get for instance 0.819 and 1.0-0.819 is 0.181
	Float64 randy;
	Float64 outlevel = GetParameter( kParam_Four );
	
	if (threshold < 1) hardness = 1.0 / (1.0-threshold);
	else hardness = 999999999999999999999.0;
	//set up hardness to exactly fill gap between threshold and 0db
	//if threshold is literally 1 then hardness is infinite, so we make it very big
	
	while (nSampleFrames-- > 0) {
		double inputSample = *sourceP;
		if (fabs(inputSample)<1.18e-23) inputSample = fpd * 1.18e-17;

		
		inputSample = *sourceP * indrive;
		//calibrated to match gain through convolution and -0.3 correction
		if (sqdrive > 0.0){
			b[33] = b[32]; b[32] = b[31]; 
			b[31] = b[30]; b[30] = b[29]; b[29] = b[28]; b[28] = b[27]; b[27] = b[26]; b[26] = b[25]; b[25] = b[24]; b[24] = b[23]; 
			b[23] = b[22]; b[22] = b[21]; b[21] = b[20]; b[20] = b[19]; b[19] = b[18]; b[18] = b[17]; b[17] = b[16]; b[16] = b[15]; 
			b[15] = b[14]; b[14] = b[13]; b[13] = b[12]; b[12] = b[11]; b[11] = b[10]; b[10] = b[9]; b[9] = b[8]; b[8] = b[7]; 
			b[7] = b[6]; b[6] = b[5]; b[5] = b[4]; b[4] = b[3]; b[3] = b[2]; b[2] = b[1]; b[1] = b[0]; b[0] = inputSample * sqdrive;
			inputSample -= (b[1] * (0.23505923670562212  - (0.00028312859289245*fabs(b[1]))));
			inputSample += (b[2] * (0.08188436704577637  - (0.00008817721351341*fabs(b[2]))));
			inputSample -= (b[3] * (0.05075798481700617  - (0.00018817166632483*fabs(b[3]))));
			inputSample -= (b[4] * (0.00455811821873093  + (0.00001922902995296*fabs(b[4]))));
			inputSample -= (b[5] * (0.00027610521433660  - (0.00013252525469291*fabs(b[5]))));
			inputSample -= (b[6] * (0.03529246280346626  - (0.00002772989223299*fabs(b[6]))));
			inputSample += (b[7] * (0.01784111585586136  + (0.00010230276997291*fabs(b[7]))));
			inputSample -= (b[8] * (0.04394950700298298  - (0.00005910607126944*fabs(b[8]))));
			inputSample += (b[9] * (0.01990770780547606  + (0.00007640328340556*fabs(b[9]))));
			inputSample -= (b[10] * (0.04073629569741782  - (0.00007712327117090*fabs(b[10]))));
			inputSample += (b[11] * (0.01349648572795252  + (0.00005959130575917*fabs(b[11]))));
			inputSample -= (b[12] * (0.03191590248003717  - (0.00008418000575151*fabs(b[12]))));
			inputSample += (b[13] * (0.00348795527924766  + (0.00005489156318238*fabs(b[13]))));
			inputSample -= (b[14] * (0.02198496281481767  - (0.00008471601187581*fabs(b[14]))));
			inputSample -= (b[15] * (0.00504771152505089  - (0.00005525060587917*fabs(b[15]))));
			inputSample -= (b[16] * (0.01391075698598491  - (0.00007929630732607*fabs(b[16]))));
			inputSample -= (b[17] * (0.01142762504081717  - (0.00005967036737742*fabs(b[17]))));
			inputSample -= (b[18] * (0.00893541815021255  - (0.00007535697758141*fabs(b[18]))));
			inputSample -= (b[19] * (0.01459704973464936  - (0.00005969199602841*fabs(b[19]))));
			inputSample -= (b[20] * (0.00694755135226282  - (0.00006930127097865*fabs(b[20]))));
			inputSample -= (b[21] * (0.01516695630808575  - (0.00006365800069826*fabs(b[21]))));
			inputSample -= (b[22] * (0.00705917318113651  - (0.00006497209096539*fabs(b[22]))));
			inputSample -= (b[23] * (0.01420501209177591  - (0.00006555654576113*fabs(b[23]))));
			inputSample -= (b[24] * (0.00815905656808701  - (0.00006105622534761*fabs(b[24]))));
			inputSample -= (b[25] * (0.01274326525552961  - (0.00006542652857017*fabs(b[25]))));
			inputSample -= (b[26] * (0.00937146927845488  - (0.00006051267868722*fabs(b[26]))));
			inputSample -= (b[27] * (0.01146573981165209  - (0.00006381511607749*fabs(b[27]))));
			inputSample -= (b[28] * (0.01021294359409007  - (0.00005930397856398*fabs(b[28]))));
			inputSample -= (b[29] * (0.01065217095323532  - (0.00006371505438319*fabs(b[29]))));
			inputSample -= (b[30] * (0.01058751196699751  - (0.00006042857480233*fabs(b[30]))));
			inputSample -= (b[31] * (0.01026557827762401  - (0.00006007776163871*fabs(b[31]))));
			inputSample -= (b[32] * (0.01060929183604604  - (0.00006114703012726*fabs(b[32]))));
			inputSample -= (b[33] * (0.01014533525058528  - (0.00005963567932887*fabs(b[33]))));}
		
		if (fabs(inputSample) > threshold)
		{
			bridgerectifier = (fabs(inputSample)-threshold)*hardness;
			//skip flat area if any, scale to distortion limit
			if (bridgerectifier > breakup) bridgerectifier = breakup;
			//max value for sine function, 'breakup' modeling for trashed console tone
			//more hardness = more solidness behind breakup modeling. more softness, more 'grunge' and sag
			bridgerectifier = sin(bridgerectifier)/hardness;
			//do the sine factor, scale back to proper amount
			if (inputSample > 0) inputSample = bridgerectifier+threshold;
			else inputSample = -(bridgerectifier+threshold);
		}
		//otherwise we leave it untouched by the overdrive stuff
		randy = ((double(fpd)/UINT32_MAX)*0.042);
		inputSample = ((inputSample*(1-randy))+(lastSample*randy)) * outlevel;
		lastSample = inputSample;
		
		
		
		

		
		//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;
	}
}

