/*
*	File:		Channel4.cpp
*	
*	Version:	1.0
* 
*	Created:	12/3/14
*	
*	Copyright:  Copyright © 2014 Airwindows, Airwindows uses the MIT license
* 
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/*=============================================================================
	Channel4.cpp
	
=============================================================================*/
#include "Channel4.h"


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

AUDIOCOMPONENT_ENTRY(AUBaseFactory, Channel4)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Channel4::Channel4
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Channel4::Channel4(AudioUnit component)
: AUEffectBase(component)
{
	CreateElements();
	Globals()->UseIndexedParameters(kNumberOfParameters);
	SetParameter(kParam_One, kDefaultValue_ParamOne );
	SetParameter(kParam_Two, kDefaultValue_ParamTwo );
	
#if AU_DEBUG_DISPATCHER
	mDebugDispatcher = new AUDebugDispatcher (this);
#endif
	
}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Channel4::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult		Channel4::GetParameterValueStrings(AudioUnitScope		inScope,
													   AudioUnitParameterID	inParameterID,
													   CFArrayRef *		outStrings)
{
    if ((inScope == kAudioUnitScope_Global) && (inParameterID == kParam_One)) //ID must be actual name of parameter identifier, not number
	{
		if (outStrings == NULL) return noErr;
		CFStringRef strings [] =
		{
			kMenuItem_Neve,
			kMenuItem_API,
			kMenuItem_SSL,
		};
		*outStrings = CFArrayCreate (
									 NULL,
									 (const void **) strings,
									 (sizeof (strings) / sizeof (strings [0])),
									 NULL
									 );
		return noErr;
	}
    return kAudioUnitErr_InvalidProperty;
}



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Channel4::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult		Channel4::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_Indexed;
                outParameterInfo.minValue = kNeve;
                outParameterInfo.maxValue = kSSL;
                outParameterInfo.defaultValue = kDefaultValue_ParamOne;
                break;
            case kParam_Two:
                AUBase::FillInParameterName (outParameterInfo, kParameterTwoName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Percent;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 100.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamTwo;
                break;
            default:
                result = kAudioUnitErr_InvalidParameter;
                break;
		}
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    
	
	
	return result;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Channel4::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult		Channel4::GetPropertyInfo (AudioUnitPropertyID	inID,
											   AudioUnitScope		inScope,
											   AudioUnitElement	inElement,
											   UInt32 &		outDataSize,
											   Boolean &		outWritable)
{
	return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Channel4::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult		Channel4::GetProperty(	AudioUnitPropertyID inID,
										  AudioUnitScope 		inScope,
										  AudioUnitElement 	inElement,
										  void *			outData )
{
	return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Channel4::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Channel4::Initialize()
{
    ComponentResult result = AUEffectBase::Initialize();
    if (result == noErr)
        Reset(kAudioUnitScope_Global, 0);
    return result;
}

#pragma mark ____Channel4EffectKernel


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Channel4::Channel4Kernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		Channel4::Channel4Kernel::Reset()
{
	fpNShapeA = 0.0;
	fpNShapeB = 0.0;
	iirSampleA = 0.0;
	iirSampleB = 0.0;
	flip = false;
	lastSample = 0.0;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Channel4::Channel4Kernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		Channel4::Channel4Kernel::Process(	const Float32 	*inSourceP,
											  Float32		 	*inDestP,
											  UInt32 			inFramesToProcess,
											  UInt32			inNumChannels,
											  bool			&ioSilence )
{
	UInt32 nSampleFrames = inFramesToProcess;
	const Float32 *sourceP = inSourceP;
	Float32 *destP = inDestP;
	Float64 overallscale = 1.0;
	overallscale /= 44100.0;
	overallscale *= GetSampleRate();
	int console = (int) GetParameter( kParam_One );
	Float64 density = pow(GetParameter( kParam_Two )/100.0,2);
	double bridgerectifier;
	Float64 iirAmount = 0.005832;
	Float64 threshold = 0.33362176;
	Float64 clamp;
	double inputSample;
	Float32 fpTemp;
	Float64 fpOld = 0.618033988749894848204586; //golden ratio!
	Float64 fpNew = 1.0 - fpOld;
	
	switch (console)
	{
		case 1: iirAmount = 0.005832; threshold = 0.33362176; break; //Neve
		case 2: iirAmount = 0.004096; threshold = 0.59969536; break; //API
		case 3: iirAmount = 0.004913; threshold = 0.84934656; break; //SSL
	}
	iirAmount /= overallscale;
	threshold /= overallscale; //now with 96K AND working selector!
	
	while (nSampleFrames-- > 0) {
		inputSample = *sourceP;
		
		if (flip)
		{
			iirSampleA = (iirSampleA * (1 - iirAmount)) + (inputSample * iirAmount);
			inputSample = inputSample - iirSampleA;
		}
		else
		{
			iirSampleB = (iirSampleB * (1 - iirAmount)) + (inputSample * iirAmount);
			inputSample = inputSample - iirSampleB;
		}
		//highpass section
		bridgerectifier = fabs(inputSample)*1.57079633;
		if (bridgerectifier > 1.57079633) bridgerectifier = 1.0;
		else bridgerectifier = sin(bridgerectifier);
		if (inputSample > 0) inputSample = (inputSample*(1-density))+(bridgerectifier*density);
		else inputSample = (inputSample*(1-density))-(bridgerectifier*density);
		//drive section
		clamp = inputSample - lastSample;
		if (clamp > threshold)
			inputSample = lastSample + threshold;
		if (-clamp > threshold)
			inputSample = lastSample - threshold;
		lastSample = inputSample;
		//slew section
		
		//noise shaping to 32-bit floating point
		if (flip) {
			fpTemp = inputSample;
			fpNShapeA = (fpNShapeA*fpOld)+((inputSample-fpTemp)*fpNew);
			inputSample += fpNShapeA;
		}
		else {
			fpTemp = inputSample;
			fpNShapeB = (fpNShapeB*fpOld)+((inputSample-fpTemp)*fpNew);
			inputSample += fpNShapeB;
		}
		//end noise shaping on 32 bit output
		flip = !flip;
		
		*destP = inputSample;
		sourceP += inNumChannels;
		destP += inNumChannels;
	}
}