/*
*	File:		DitherFloat.cpp
*	
*	Version:	1.0
* 
*	Created:	1/11/19
*	
*	Copyright:  Copyright © 2019 Airwindows, Airwindows uses the MIT license
* 
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/*=============================================================================
	DitherFloat.cpp
	
=============================================================================*/
#include "DitherFloat.h"

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

AUDIOCOMPONENT_ENTRY(AUBaseFactory, DitherFloat)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	DitherFloat::DitherFloat
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DitherFloat::DitherFloat(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
	
}


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



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	DitherFloat::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult			DitherFloat::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 = 0.0;
                outParameterInfo.maxValue = 32.0;
                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;
}

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

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

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

#pragma mark ____DitherFloatEffectKernel



//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	DitherFloat::DitherFloatKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		DitherFloat::DitherFloatKernel::Reset()
{
	fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	DitherFloat::DitherFloatKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void		DitherFloat::DitherFloatKernel::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();

	int floatOffset = GetParameter( kParam_One );
	double blend = GetParameter( kParam_Two );

	double gain = 0;
	
	switch (floatOffset)
	{
		case 0: gain = 1.0; break;
		case 1: gain = 2.0; break;
		case 2: gain = 4.0; break;
		case 3: gain = 8.0; break;
		case 4: gain = 16.0; break;
		case 5: gain = 32.0; break;
		case 6: gain = 64.0; break;
		case 7: gain = 128.0; break;
		case 8: gain = 256.0; break;
		case 9: gain = 512.0; break;
		case 10: gain = 1024.0; break;
		case 11: gain = 2048.0; break;
		case 12: gain = 4096.0; break;
		case 13: gain = 8192.0; break;
		case 14: gain = 16384.0; break;
		case 15: gain = 32768.0; break;
		case 16: gain = 65536.0; break;
		case 17: gain = 131072.0; break;
		case 18: gain = 262144.0; break;
		case 19: gain = 524288.0; break;
		case 20: gain = 1048576.0; break;
		case 21: gain = 2097152.0; break;
		case 22: gain = 4194304.0; break;
		case 23: gain = 8388608.0; break;
		case 24: gain = 16777216.0; break;
		case 25: gain = 33554432.0; break;
		case 26: gain = 67108864.0; break;
		case 27: gain = 134217728.0; break;
		case 28: gain = 268435456.0; break;
		case 29: gain = 536870912.0; break;
		case 30: gain = 1073741824.0; break;
		case 31: gain = 2147483648.0; break;
		case 32: gain = 4294967296.0; break;
	}
	//we are directly punching in the gain values rather than calculating them
	//gain *= gain; //for testing with double precision, 64 bit
	
	while (nSampleFrames-- > 0) {
		double inputSample = *sourceP + (gain-1); //this offsets the float into total truncation-land.
		

		
		//begin 32 bit floating point dither
		int expon; frexpf((float)inputSample, &expon);
		fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
		inputSample += (fpd*3.4e-36l*pow(2,expon+62) * blend);	//remove 'blend' for real use, it's for the demo	
		//end 32 bit floating point dither

		/* copy and paste into code, fpd is a uint32_t initialized as 17 (NOT 0)
		 
		//begin 32 bit floating point dither
		int expon; frexpf((float)inputSample, &expon);
		fpd ^= fpd<<13; fpd ^= fpd>>17; fpd ^= fpd<<5;
		inputSample += (fpd*3.4e-36l*pow(2,expon+62));	
		//end 32 bit floating point dither
		
		//begin 64 bit floating point dither
		int expon; frexp((double)inputSample, &expon);
		fpd ^= fpd<<13; fpd ^= fpd>>17; fpd ^= fpd<<5;
		inputSample += (fpd*6.4e-45l*pow(2,expon+62));	
		//end 64 bit floating point dither
		 
		*/
		
		
		inputSample = (float)inputSample; //equivalent of 'floor' for 32 bit floating point
		//We do that separately, we're truncating to floating point WHILE heavily offset.
		
		*destP = inputSample - (gain-1); //this de-offsets the float.
		sourceP += inNumChannels; destP += inNumChannels;
	}
}

