/*
*	File:		GuitarConditioner.cpp
*	
*	Version:	1.0
* 
*	Created:	8/18/16
*	
*	Copyright:  Copyright © 2016 Airwindows, Airwindows uses the MIT license
* 
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*				software.
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/*=============================================================================
	GuitarConditioner.cpp
	
=============================================================================*/
#include "GuitarConditioner.h"


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

COMPONENT_ENTRY(GuitarConditioner)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	GuitarConditioner::GuitarConditioner
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GuitarConditioner::GuitarConditioner(AudioUnit component)
	: AUEffectBase(component)
{
	CreateElements();
	Globals()->UseIndexedParameters(kNumberOfParameters);
         
#if AU_DEBUG_DISPATCHER
	mDebugDispatcher = new AUDebugDispatcher (this);
#endif
	
}


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



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

	outParameterInfo.flags = 	kAudioUnitParameterFlag_IsWritable
						|		kAudioUnitParameterFlag_IsReadable;
    
    if (inScope == kAudioUnitScope_Global) {
        switch(inParameterID)
        {
            default:
                result = kAudioUnitErr_InvalidParameter;
                break;
            }
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    


	return result;
}

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

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

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

#pragma mark ____GuitarConditionerEffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	GuitarConditioner::GuitarConditionerKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		GuitarConditioner::GuitarConditionerKernel::Reset()
{
	fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
	fpFlip = true;
	lastSampleT = 0.0;
	lastSampleB = 0.0; //for Slews. T for treble, B for bass
	iirSampleTA = 0.0;
	iirSampleTB = 0.0;
	iirSampleBA = 0.0;
	iirSampleBB = 0.0; //for Highpasses
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	GuitarConditioner::GuitarConditionerKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		GuitarConditioner::GuitarConditionerKernel::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 inputSample;
	double treble;
	double bass;
	Float64 iirTreble = 0.287496/overallscale; //tight is -1
	Float64 iirBass = 0.085184/overallscale; //tight is 1
	iirTreble += iirTreble;
	iirBass += iirBass; //simple double when tight is -1 or 1
	Float64 tightBass = 0.6666666666;
	Float64 tightTreble = -0.3333333333;
	Float64 offset;
	Float64 clamp;
	Float64 threshTreble = 0.0081/overallscale;
	Float64 threshBass = 0.0256/overallscale;

	
	while (nSampleFrames-- > 0) {
		inputSample = *sourceP;
		if (fabs(inputSample)<1.18e-23) inputSample = fpd * 1.18e-17;
		
		
		treble = bass = inputSample;
		treble += treble; //+3dB on treble as the highpass is higher
		
		offset = (1 + tightTreble) + ((1-fabs(treble))*tightTreble); //treble HP
		if (offset < 0) offset = 0;
		if (offset > 1) offset = 1; //made offset for HP
		if (fpFlip) {
			iirSampleTA = (iirSampleTA * (1 - (offset * iirTreble))) + (treble * (offset * iirTreble));
			treble = treble - iirSampleTA;
		} else {
			iirSampleTB = (iirSampleTB * (1 - (offset * iirTreble))) + (treble * (offset * iirTreble));
			treble = treble - iirSampleTB;
		} //done treble HP
		
		offset = (1 - tightBass) + (fabs(bass)*tightBass); //bass HP
		if (offset < 0) offset = 0;
		if (offset > 1) offset = 1;
		if (fpFlip) {
			iirSampleBA = (iirSampleBA * (1 - (offset * iirBass))) + (bass * (offset * iirBass));
			bass = bass - iirSampleBA;
		} else {
			iirSampleBB = (iirSampleBB * (1 - (offset * iirBass))) + (bass * (offset * iirBass));
			bass = bass - iirSampleBB;
		} //done bass HP
		
		inputSample = treble;
		clamp = inputSample - lastSampleT;
		if (clamp > threshTreble)
			treble = lastSampleT + threshTreble;
		if (-clamp > threshTreble)
			treble = lastSampleT - threshTreble;
		lastSampleT = treble; //treble slew
		
		inputSample = bass;
		clamp = inputSample - lastSampleB;
		if (clamp > threshBass)
			bass = lastSampleB + threshBass;
		if (-clamp > threshBass)
			bass = lastSampleB - threshBass;
		lastSampleB = bass; //bass slew
		
		inputSample = treble + bass; //final merge
		fpFlip = !fpFlip;
		
		//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;
	}
}

