/*
*	File:		Pressure4Mono.cpp
*	
*	Version:	1.0
* 
*	Created:	9/8/16
*	
*	Copyright:  Copyright © 2016 Airwindows, Airwindows uses the MIT license
* 
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/*=============================================================================
	Pressure4Mono.cpp
	
=============================================================================*/
#include "Pressure4Mono.h"


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

COMPONENT_ENTRY(Pressure4Mono)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Pressure4Mono::Pressure4Mono
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Pressure4Mono::Pressure4Mono(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
	
}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Pressure4Mono::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Pressure4Mono::GetParameterValueStrings(AudioUnitScope		inScope,
                                                                AudioUnitParameterID	inParameterID,
                                                                CFArrayRef *		outStrings)
{
        
    return kAudioUnitErr_InvalidProperty;
}



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Pressure4Mono::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Pressure4Mono::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 = -1.0;
                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;
			default:
                result = kAudioUnitErr_InvalidParameter;
                break;
            }
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    


	return result;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Pressure4Mono::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Pressure4Mono::GetPropertyInfo (AudioUnitPropertyID	inID,
                                                        AudioUnitScope		inScope,
                                                        AudioUnitElement	inElement,
                                                        UInt32 &		outDataSize,
                                                        Boolean &		outWritable)
{
	return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Pressure4Mono::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			Pressure4Mono::GetProperty(	AudioUnitPropertyID inID,
                                                        AudioUnitScope 		inScope,
                                                        AudioUnitElement 	inElement,
                                                        void *			outData )
{
	return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}

//	Pressure4Mono::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Pressure4Mono::Initialize()
{
    ComponentResult result = AUEffectBase::Initialize();
    if (result == noErr)
        Reset(kAudioUnitScope_Global, 0);
    return result;
}

#pragma mark ____Pressure4MonoEffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Pressure4Mono::Pressure4MonoKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		Pressure4Mono::Pressure4MonoKernel::Reset()
{
	fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
	muSpeedA = 10000;
	muSpeedB = 10000;
	muCoefficientA = 1;
	muCoefficientB = 1;
	muVary = 1;
	flip = false;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Pressure4Mono::Pressure4MonoKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		Pressure4Mono::Pressure4MonoKernel::Process(	const Float32 	*inSourceP,
                                                    Float32		 	*inDestP,
                                                    UInt32 			inFramesToProcess,
                                                    UInt32			inNumChannels, 
                                                    bool			&ioSilence )
{
	UInt32 nSampleFrames = inFramesToProcess;
	const Float32 *sourceP = inSourceP;
	Float64 overallscale = 1.0;
	overallscale /= 44100.0;
	overallscale *= GetSampleRate();
	Float32 *destP = inDestP;
	Float64 threshold = 1.0 - (GetParameter( kParam_One ) * 0.95);
	Float64 muMakeupGain = 1.0 / threshold;
	//gain settings around threshold
	Float64 release = pow((1.28-GetParameter( kParam_Two )),5)*32768.0;
	release /= overallscale;
	Float64 fastest = sqrt(release);
	//speed settings around release
	double bridgerectifier;
	Float64 coefficient;
	Float64 mewiness = GetParameter( kParam_Three );
	Float64 outputGain = GetParameter( kParam_Four );
	Float64 unmewiness;
	bool positivemu;
	if (mewiness >= 0)
	{
		positivemu = true;
		unmewiness = 1.0-mewiness;
	}
	else
	{
		positivemu = false;
		mewiness = -mewiness;
		unmewiness = 1.0-mewiness;
	}
	// µ µ µ µ µ µ µ µ µ µ µ µ is the kitten song o/~
	double inputSample;
	
	while (nSampleFrames-- > 0) {
		inputSample = *sourceP;
		if (fabs(inputSample)<1.18e-23) inputSample = fpd * 1.18e-17;
		
		
		sourceP += inNumChannels;	// advance to next frame (e.g. if stereo, we're advancing 2 samples);
		inputSample = inputSample * muMakeupGain;
		
		if (flip)
		{
			if (fabs(inputSample) > threshold)
			{
				muVary = threshold / fabs(inputSample);
				muAttack = sqrt(fabs(muSpeedA));
				muCoefficientA = muCoefficientA * (muAttack-1.0);
				if (muVary < threshold)
				{
					muCoefficientA = muCoefficientA + threshold;
				}
				else
				{
					muCoefficientA = muCoefficientA + muVary;
				}
				muCoefficientA = muCoefficientA / muAttack;
			}
			else
			{
				muCoefficientA = muCoefficientA * ((muSpeedA * muSpeedA)-1.0);
				muCoefficientA = muCoefficientA + 1.0;
				muCoefficientA = muCoefficientA / (muSpeedA * muSpeedA);
			}
			muNewSpeed = muSpeedA * (muSpeedA-1);
			muNewSpeed = muNewSpeed + fabs(inputSample*release)+fastest;
			muSpeedA = muNewSpeed / muSpeedA;
		}
		else
		{
			if (fabs(inputSample) > threshold)
			{
				muVary = threshold / fabs(inputSample);
				muAttack = sqrt(fabs(muSpeedB));
				muCoefficientB = muCoefficientB * (muAttack-1);
				if (muVary < threshold)
				{
					muCoefficientB = muCoefficientB + threshold;
				}
				else
				{
					muCoefficientB = muCoefficientB + muVary;
				}
				muCoefficientB = muCoefficientB / muAttack;
			}
			else
			{
				muCoefficientB = muCoefficientB * ((muSpeedB * muSpeedB)-1.0);
				muCoefficientB = muCoefficientB + 1.0;
				muCoefficientB = muCoefficientB / (muSpeedB * muSpeedB);
			}
			muNewSpeed = muSpeedB * (muSpeedB-1);
			muNewSpeed = muNewSpeed + fabs(inputSample*release)+fastest;
			muSpeedB = muNewSpeed / muSpeedB;
		}
		//got coefficients, adjusted speeds
		
		if (flip)
		{
			if (positivemu) coefficient = pow(muCoefficientA,2);
			else coefficient = sqrt(muCoefficientA);
			coefficient = (coefficient*mewiness)+(muCoefficientA*unmewiness);
			inputSample *= coefficient;
		}
		else
		{
			if (positivemu) coefficient = pow(muCoefficientB,2);
			else coefficient = sqrt(muCoefficientB);
			coefficient = (coefficient*mewiness)+(muCoefficientB*unmewiness);
			inputSample *= coefficient;
		}
		//applied compression with vari-vari-µ-µ-µ-µ-µ-µ-is-the-kitten-song o/~
		//applied gain correction to control output level- tends to constrain sound rather than inflate it
		
		if (outputGain != 1.0) {
			inputSample *= outputGain;
		}
		
		bridgerectifier = fabs(inputSample);
		if (bridgerectifier > 1.57079633) bridgerectifier = 1.0;
		else bridgerectifier = sin(bridgerectifier);
		if (inputSample > 0){inputSample = bridgerectifier;}
		else {inputSample = -bridgerectifier;}
		//second stage of overdrive to prevent overs and allow bloody loud extremeness
		flip = !flip;
		
		//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;
		destP += inNumChannels;
	}
}