/*
*	File:		Slew2.cpp
*	
*	Version:	1.0
* 
*	Created:	9/24/10
*	
*	Copyright:  Copyright © 2010 Airwindows, Airwindows uses the MIT license
* 
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/*=============================================================================
	Slew2.h
	
=============================================================================*/
#include "Slew2.h"


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

COMPONENT_ENTRY(Slew2)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Slew2::Slew2
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Slew2::Slew2(AudioUnit component)
	: AUEffectBase(component)
{
	CreateElements();
	Globals()->UseIndexedParameters(kNumberOfParameters);
	SetParameter(kParam_One, kDefaultValue_ParamOne );
        
#if AU_DEBUG_DISPATCHER
	mDebugDispatcher = new AUDebugDispatcher (this);
#endif
	
}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Slew2::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult		Slew2::GetParameterValueStrings(AudioUnitScope		inScope,
                                                                AudioUnitParameterID	inParameterID,
                                                                CFArrayRef *		outStrings)
{
        
    return kAudioUnitErr_InvalidProperty;
}



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Slew2::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult		Slew2::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;
           default:
                result = kAudioUnitErr_InvalidParameter;
                break;
            }
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    


	return result;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Slew2::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult		Slew2::GetPropertyInfo (AudioUnitPropertyID	inID,
                                                        AudioUnitScope		inScope,
                                                        AudioUnitElement	inElement,
                                                        UInt32 &		outDataSize,
                                                        Boolean &		outWritable)
{
	return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Slew2::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult		Slew2::GetProperty(	AudioUnitPropertyID inID,
                                                        AudioUnitScope 		inScope,
                                                        AudioUnitElement 	inElement,
                                                        void *			outData )
{
	return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Slew2::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Slew2::Initialize()
{
    ComponentResult result = AUEffectBase::Initialize();
    if (result == noErr)
        Reset(kAudioUnitScope_Global, 0);
    return result;
}

#pragma mark ____Slew2EffectKernel


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Slew2::Slew2Kernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		Slew2::Slew2Kernel::Reset()
{
	ataLast3Sample = ataLast2Sample = ataLast1Sample = 0.0;
	ataHalfwaySample = ataHalfDrySample = ataHalfDiffSample = 0.0;
	ataA = ataB = ataC = ataDrySample = ataDiffSample = ataPrevDiffSample = 0.0;
	ataUpsampleHighTweak = 0.0414213562373095048801688; //more adds treble to upsampling
	ataDecay = 0.915965594177219015; //Catalan's constant, more adds focus and clarity
	ataFlip = false; //end reset of antialias parameters
	lastSample = 0.0;
	fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	Slew2::Slew2Kernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		Slew2::Slew2Kernel::Process(	const Float32 	*inSourceP,
                                                    Float32		 	*inDestP,
                                                    UInt32 			inFramesToProcess,
                                                    UInt32			inNumChannels,
                                                    bool			&ioSilence )
{
	UInt32 nSampleFrames = inFramesToProcess;
	const Float32 *sourceP = inSourceP;
	Float32 *destP = inDestP;
	Float64 overallscale = 2.0;
	overallscale /= 44100.0;
	overallscale *= GetSampleRate();
	Float64 inputSample;
	Float64 clamp;
	Float64 threshold = pow((1-GetParameter( kParam_One )),4)/overallscale;
	
	while (nSampleFrames-- > 0) {
		inputSample = *sourceP;
		if (fabs(inputSample)<1.18e-23) inputSample = fpd * 1.18e-17;
		ataDrySample = inputSample;
		
		ataHalfDrySample = ataHalfwaySample = (inputSample + ataLast1Sample + ((-ataLast2Sample + ataLast3Sample) * ataUpsampleHighTweak)) / 2.0;
		ataLast3Sample = ataLast2Sample; ataLast2Sample = ataLast1Sample; ataLast1Sample = inputSample;
		//setting up oversampled special antialiasing
	//begin first half- change inputSample -> ataHalfwaySample, ataDrySample -> ataHalfDrySample
		clamp = ataHalfwaySample - ataHalfDrySample;
		if (clamp > threshold)
			ataHalfwaySample = lastSample + threshold;
		if (-clamp > threshold)
			ataHalfwaySample = lastSample - threshold;
		lastSample = ataHalfwaySample;
		

	//end first half
		//begin antialiasing section for halfway sample
		ataC = ataHalfwaySample - ataHalfDrySample;
		if (ataFlip) {ataA *= ataDecay; ataB *= ataDecay; ataA += ataC; ataB -= ataC; ataC = ataA;}
		else {ataB *= ataDecay; ataA *= ataDecay; ataB += ataC; ataA -= ataC; ataC = ataB;}
		ataHalfDiffSample = (ataC * ataDecay); ataFlip = !ataFlip;
		//end antialiasing section for halfway sample
	//begin second half- inputSample and ataDrySample handled separately here
		
		clamp = inputSample - lastSample;
		if (clamp > threshold)
			inputSample = lastSample + threshold;
		if (-clamp > threshold)
			inputSample = lastSample - threshold;
		lastSample = inputSample;
		

	//end second half
		//begin antialiasing section for input sample
		ataC = inputSample - ataDrySample;
		if (ataFlip) {ataA *= ataDecay; ataB *= ataDecay; ataA += ataC; ataB -= ataC; ataC = ataA;}
		else {ataB *= ataDecay; ataA *= ataDecay; ataB += ataC; ataA -= ataC; ataC = ataB;}
		ataDiffSample = (ataC * ataDecay); ataFlip = !ataFlip;
		//end antialiasing section for input sample
		inputSample = ataDrySample; inputSample += ((ataDiffSample + ataHalfDiffSample + ataPrevDiffSample) / 0.734);
		ataPrevDiffSample = ataDiffSample / 2.0;
		//apply processing as difference to non-oversampled raw input

		//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;
		//built in output trim and dry/wet by default
		
		sourceP += inNumChannels; destP += inNumChannels;
	}
}

