/*
*	File:		TapeDelay.cpp
*	
*	Version:	1.0
* 
*	Created:	11/29/18
*	
*	Copyright:  Copyright © 2018 Airwindows, Airwindows uses the MIT license
* 
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/*=============================================================================
	TapeDelay.cpp
	
=============================================================================*/
#include "TapeDelay.h"


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

COMPONENT_ENTRY(TapeDelay)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	TapeDelay::TapeDelay
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
TapeDelay::TapeDelay(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 );
	SetParameter(kParam_Five, kDefaultValue_ParamFive );
	SetParameter(kParam_Six, kDefaultValue_ParamSix );
         
#if AU_DEBUG_DISPATCHER
	mDebugDispatcher = new AUDebugDispatcher (this);
#endif
	
}


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



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	TapeDelay::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			TapeDelay::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;
                outParameterInfo.defaultValue = kDefaultValue_ParamOne;
                break;
            case kParam_Two:
                AUBase::FillInParameterName (outParameterInfo, kParameterTwoName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1;
                outParameterInfo.defaultValue = kDefaultValue_ParamTwo;
                break;
            case kParam_Three:
                AUBase::FillInParameterName (outParameterInfo, kParameterThreeName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1;
                outParameterInfo.defaultValue = kDefaultValue_ParamThree;
                break;
            case kParam_Four:
                AUBase::FillInParameterName (outParameterInfo, kParameterFourName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = 0.0;
                outParameterInfo.maxValue = 1;
                outParameterInfo.defaultValue = kDefaultValue_ParamFour;
                break;
            case kParam_Five:
                AUBase::FillInParameterName (outParameterInfo, kParameterFiveName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
                outParameterInfo.minValue = -1.0;
                outParameterInfo.maxValue = 1.0;
                outParameterInfo.defaultValue = kDefaultValue_ParamFive;
                break;
            case kParam_Six:
                AUBase::FillInParameterName (outParameterInfo, kParameterSixName, false);
                outParameterInfo.unit = kAudioUnitParameterUnit_CustomUnit;
				outParameterInfo.unitName = kParameterSixUnit;
                outParameterInfo.minValue = 3;
                outParameterInfo.maxValue = 32;
                outParameterInfo.defaultValue = kDefaultValue_ParamSix;
                break;
			default:
                result = kAudioUnitErr_InvalidParameter;
                break;
            }
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    


	return result;
}

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

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

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

#pragma mark ____TapeDelayEffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	TapeDelay::TapeDelayKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		TapeDelay::TapeDelayKernel::Reset()
{
	for(int count = 0; count < 257; count++) {p[count] = 0;}
	for(delay = 0; delay < 44100; delay++) {d[delay] = 0.0;}
	maxdelay = 0;
	delay = 0;
	gcount = 0;
	chase = 0;
	fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	TapeDelay::TapeDelayKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		TapeDelay::TapeDelayKernel::Process(	const Float32 	*inSourceP,
                                                    Float32		 	*inDestP,
                                                    UInt32 			inFramesToProcess,
                                                    UInt32			inNumChannels, 
                                                    bool			&ioSilence )
{
	UInt32 nSampleFrames = inFramesToProcess;
	const Float32 *sourceP = inSourceP;
	Float32 *destP = inDestP;
	Float64 dry = pow(GetParameter( kParam_One ),2);
	Float64 wet = pow(GetParameter( kParam_Two ),2);
	int targetdelay = (int)(44000*GetParameter( kParam_Three ));
	Float64 feedback = (GetParameter( kParam_Four )*1.3);
	Float64 leanfat = GetParameter( kParam_Five );
	Float64 fatwet = fabs(leanfat);
	Float64 storedelay;
	int fatness = (int)GetParameter( kParam_Six );
	Float64 sum = 0.0;
	Float64 floattotal = 0.0;
	SInt32 sumtotal = 0;
	SInt32 count;
	
	
	while (nSampleFrames-- > 0) {
		double inputSample = *sourceP;

		if (fabs(inputSample)<1.18e-23) inputSample = fpd * 1.18e-17;

		if (gcount < 0 || gcount > 128) {gcount = 128;}
		count = gcount;
		if (delay < 0 || delay > maxdelay) {delay = maxdelay;}
		sum = inputSample + (d[delay]*feedback);
		p[count+128] = p[count] = sumtotal = (SInt32)(sum*8388608.0);
		switch (fatness)
		{
			case 32: sumtotal += p[count+127]; //note NO break statement.
			case 31: sumtotal += p[count+113]; //This jumps to the relevant tap
			case 30: sumtotal += p[count+109]; //and then includes all smaller taps.
			case 29: sumtotal += p[count+107];
			case 28: sumtotal += p[count+103];
			case 27: sumtotal += p[count+101];
			case 26: sumtotal += p[count+97];
			case 25: sumtotal += p[count+89];
			case 24: sumtotal += p[count+83];
			case 23: sumtotal += p[count+79];
			case 22: sumtotal += p[count+73];
			case 21: sumtotal += p[count+71];
			case 20: sumtotal += p[count+67];
			case 19: sumtotal += p[count+61];
			case 18: sumtotal += p[count+59];
			case 17: sumtotal += p[count+53];
			case 16: sumtotal += p[count+47];
			case 15: sumtotal += p[count+43];
			case 14: sumtotal += p[count+41];
			case 13: sumtotal += p[count+37];
			case 12: sumtotal += p[count+31];
			case 11: sumtotal += p[count+29];
			case 10: sumtotal += p[count+23];
			case 9: sumtotal += p[count+19];
			case 8: sumtotal += p[count+17];
			case 7: sumtotal += p[count+13];
			case 6: sumtotal += p[count+11];
			case 5: sumtotal += p[count+7];
			case 4: sumtotal += p[count+5];
			case 3: sumtotal += p[count+3];
			case 2: sumtotal += p[count+2];
			case 1: sumtotal += p[count+1];
		}
		
		floattotal = (Float64)(sumtotal/fatness+1);
		floattotal /= 8388608.0;
		floattotal *= fatwet;
		if (leanfat < 0) {storedelay = sum-floattotal;}
		else {storedelay = (sum * (1-fatwet))+floattotal;}
				
		chase += abs(maxdelay - targetdelay);
		if (chase > 9000)
		{
			if (maxdelay > targetdelay) {d[delay] = storedelay; maxdelay -= 1; delay -= 1; if (delay < 0) {delay = maxdelay;} d[delay] = storedelay;}
			if (maxdelay < targetdelay) {maxdelay += 1; delay += 1; if (delay > maxdelay) {delay = 0;} d[delay] = storedelay;}
			chase = 0;
		}
		else
		{
			d[delay] = storedelay;
		}
		
		gcount--;
		delay--;
		if (delay < 0 || delay > maxdelay) {delay = maxdelay;}
		//yes this is a second bounds check. it's cheap, check EVERY time
		inputSample = (inputSample * dry) + (d[delay] * wet);		

		//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;
	}
}

