/*
*	File:		VinylDither.cpp
*	
*	Version:	1.0
* 
*	Created:	11/17/16
*	
*	Copyright:  Copyright � 2016 Airwindows, Airwindows uses the MIT license
* 
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/*=============================================================================
	VinylDither.cpp
	
=============================================================================*/
#include "VinylDither.h"


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

COMPONENT_ENTRY(VinylDither)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	VinylDither::VinylDither
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
VinylDither::VinylDither(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
	
}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	VinylDither::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			VinylDither::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_CD,
			kMenuItem_HD,
		};
		*outStrings = CFArrayCreate (
									 NULL,
									 (const void **) strings,
									 (sizeof (strings) / sizeof (strings [0])),
									 NULL
									 );
		return noErr;
	}
    return kAudioUnitErr_InvalidProperty;
}



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	VinylDither::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			VinylDither::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 = kCD;
                outParameterInfo.maxValue = kHD;
                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;
			default:
                result = kAudioUnitErr_InvalidParameter;
                break;
		}
	} else {
        result = kAudioUnitErr_InvalidParameter;
    }
    


	return result;
}

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

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

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

#pragma mark ____VinylDitherEffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	VinylDither::VinylDitherKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		VinylDither::VinylDitherKernel::Reset()
{
	NSOdd = 0.0;
	prev = 0.0;
	ns[0] = 0;
	ns[1] = 0;
	ns[2] = 0;
	ns[3] = 0;
	ns[4] = 0;
	ns[5] = 0;
	ns[6] = 0;
	ns[7] = 0;
	ns[8] = 0;
	ns[9] = 0;
	ns[10] = 0;
	ns[11] = 0;
	ns[12] = 0;
	ns[13] = 0;
	ns[14] = 0;
	ns[15] = 0;
	fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	VinylDither::VinylDitherKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		VinylDither::VinylDitherKernel::Process(	const Float32 	*inSourceP,
                                                    Float32		 	*inDestP,
                                                    UInt32 			inFramesToProcess,
                                                    UInt32			inNumChannels, 
                                                    bool			&ioSilence )
{
	UInt32 nSampleFrames = inFramesToProcess;
	const Float32 *sourceP = inSourceP;
	Float32 *destP = inDestP;
	
	double inputSample;
	Float64 absSample;
	
	bool highres = false;
	if (GetParameter( kParam_One ) == 1) highres = true;
	Float32 scaleFactor;
	if (highres) scaleFactor = 8388608.0;
	else scaleFactor = 32768.0;
	Float32 derez = GetParameter( kParam_Two );
	if (derez > 0.0) scaleFactor *= pow(1.0-derez,6);
	if (scaleFactor < 0.0001) scaleFactor = 0.0001;
	Float32 outScale = scaleFactor;
	if (outScale < 8.0) outScale = 8.0;
	
	
	while (nSampleFrames-- > 0) {
		inputSample = *sourceP;
		if (fabs(inputSample)<1.18e-23) inputSample = fpd * 1.18e-17;
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		
		
		inputSample *= scaleFactor;
		//0-1 is now one bit, now we dither
		
		absSample = ((double(fpd)/UINT32_MAX) - 0.5);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		ns[0] += absSample; ns[0] /= 2; absSample -= ns[0];
		absSample += ((double(fpd)/UINT32_MAX) - 0.5);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		ns[1] += absSample; ns[1] /= 2; absSample -= ns[1];
		absSample += ((double(fpd)/UINT32_MAX) - 0.5);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		ns[2] += absSample; ns[2] /= 2; absSample -= ns[2];
		absSample += ((double(fpd)/UINT32_MAX) - 0.5);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		ns[3] += absSample; ns[3] /= 2; absSample -= ns[3];
		absSample += ((double(fpd)/UINT32_MAX) - 0.5);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		ns[4] += absSample; ns[4] /= 2; absSample -= ns[4];
		absSample += ((double(fpd)/UINT32_MAX) - 0.5);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		ns[5] += absSample; ns[5] /= 2; absSample -= ns[5];
		absSample += ((double(fpd)/UINT32_MAX) - 0.5);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		ns[6] += absSample; ns[6] /= 2; absSample -= ns[6];
		absSample += ((double(fpd)/UINT32_MAX) - 0.5);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		ns[7] += absSample; ns[7] /= 2; absSample -= ns[7];
		absSample += ((double(fpd)/UINT32_MAX) - 0.5);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		ns[8] += absSample; ns[8] /= 2; absSample -= ns[8];
		absSample += ((double(fpd)/UINT32_MAX) - 0.5);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		ns[9] += absSample; ns[9] /= 2; absSample -= ns[9];
		absSample += ((double(fpd)/UINT32_MAX) - 0.5);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		ns[10] += absSample; ns[10] /= 2; absSample -= ns[10];
		absSample += ((double(fpd)/UINT32_MAX) - 0.5);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		ns[11] += absSample; ns[11] /= 2; absSample -= ns[11];
		absSample += ((double(fpd)/UINT32_MAX) - 0.5);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		ns[12] += absSample; ns[12] /= 2; absSample -= ns[12];
		absSample += ((double(fpd)/UINT32_MAX) - 0.5);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		ns[13] += absSample; ns[13] /= 2; absSample -= ns[13];
		absSample += ((double(fpd)/UINT32_MAX) - 0.5);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		ns[14] += absSample; ns[14] /= 2; absSample -= ns[14];
		absSample += ((double(fpd)/UINT32_MAX) - 0.5);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		ns[15] += absSample; ns[15] /= 2; absSample -= ns[15];
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		absSample += inputSample;
		//install noise and then shape it
		
		//NSOdd /= 1.0001; //NSDensity
		
		if (NSOdd > 0) NSOdd -= 0.97;
		if (NSOdd < 0) NSOdd += 0.97;
		
		NSOdd -= (NSOdd * NSOdd * NSOdd * 0.475);
		
		NSOdd += prev;
		absSample += (NSOdd*0.475);
		prev = floor(absSample) - inputSample;
		inputSample = floor(absSample);
		//TenNines dither
		
		inputSample /= outScale;
		
		*destP = inputSample;
		sourceP += inNumChannels; destP += inNumChannels;
	}
}

