/*
*	File:		BrassRider.cpp
*	
*	Version:	1.0
* 
*	Created:	5/15/10
*	
*	Copyright:  Copyright © 2010 Airwindows, Airwindows uses the MIT license
* 
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/*=============================================================================
	BrassRider.h
	
=============================================================================*/
#include "BrassRider.h"


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

COMPONENT_ENTRY(BrassRider)


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	BrassRider::BrassRider
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BrassRider::BrassRider(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
	
}


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


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	BrassRider::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult		BrassRider::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;
            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;
}

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

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// state that plugin supports only stereo-in/stereo-out processing
UInt32 BrassRider::SupportedNumChannels(const AUChannelInfo ** outInfo)
{
	if (outInfo != NULL)
	{
		static AUChannelInfo info;
		info.inChannels = 2;
		info.outChannels = 2;
		*outInfo = &info;
	}

	return 1;
}

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

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

#pragma mark ____BrassRiderEffectKernel

//-----------------------------------------------------------------------------------------
// this is called the reset the DSP state (clear buffers, reset counters, etc.)
ComponentResult		BrassRider::Reset(AudioUnitScope inScope, AudioUnitElement inElement)
{
	for(int count = 0; count < 80001; count++) {d[count] = 0.0; e[count] = 0.0;}
	control = 0.0;
	clamp = 0.0;
	highIIRL = 0.0;
	slewIIRL = 0.0;
	highIIR2L = 0.0;
	slewIIR2L = 0.0;
	lastSampleL = 0.0;
	lastSlewL = 0.0;
	highIIRR = 0.0;
	slewIIRR = 0.0;
	highIIR2R = 0.0;
	slewIIR2R = 0.0;
	lastSampleR = 0.0;
	lastSlewR = 0.0;
	gcount = 0;
	fpdL = 1.0; while (fpdL < 16386) fpdL = rand()*UINT32_MAX;
	fpdR = 1.0; while (fpdR < 16386) fpdR = rand()*UINT32_MAX;

	return noErr;
}


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	BrassRider::ProcessBufferLists
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
OSStatus		BrassRider::ProcessBufferLists(AudioUnitRenderActionFlags & ioActionFlags,
													const AudioBufferList & inBuffer,
                                                    AudioBufferList & outBuffer,
                                                    UInt32 			inFramesToProcess)
{

	Float32 * inputL = (Float32*)(inBuffer.mBuffers[0].mData);
	Float32 * inputR = (Float32*)(inBuffer.mBuffers[1].mData);
	Float32 * outputL = (Float32*)(outBuffer.mBuffers[0].mData);
	Float32 * outputR = (Float32*)(outBuffer.mBuffers[1].mData);
	UInt32 nSampleFrames = inFramesToProcess;
	Float64 limitOut = GetParameter( kParam_One )*16;
	int offsetA = 13500;
	int offsetB = 16700;
	Float64 wet = GetParameter( kParam_Two );
	
	while (nSampleFrames-- > 0) {
		double inputSampleL = *inputL;
		double inputSampleR = *inputR;
		//assign working variables
		if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpdL * 1.18e-17;
		if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
		double drySampleL = inputSampleL;
		double drySampleR = inputSampleR;

		inputSampleL *= limitOut;
		highIIRL = (highIIRL*0.5);
		highIIRL += (inputSampleL*0.5);
		inputSampleL -= highIIRL;
		highIIR2L = (highIIR2L*0.5);
		highIIR2L += (inputSampleL*0.5);
		inputSampleL -= highIIR2L;
		double slewSampleL = fabs(inputSampleL - lastSampleL);
		lastSampleL = inputSampleL;
		slewSampleL /= fabs(inputSampleL * lastSampleL)+0.2;
		slewIIRL = (slewIIRL*0.5);
		slewIIRL += (slewSampleL*0.5);
		slewSampleL = fabs(slewSampleL - slewIIRL);
		slewIIR2L = (slewIIR2L*0.5);
		slewIIR2L += (slewSampleL*0.5);
		slewSampleL = fabs(slewSampleL - slewIIR2L);
		double bridgerectifier = slewSampleL;
		//there's the left channel, now to feed it to overall clamp
		
		if (bridgerectifier > 3.1415) bridgerectifier = 0.0;
		bridgerectifier = sin(bridgerectifier);
		if (gcount < 0 || gcount > 40000) {gcount = 40000;}
		d[gcount+40000] = d[gcount] = bridgerectifier;
		control += (d[gcount] / (offsetA+1));
		control -= (d[gcount+offsetA] / offsetA);
		Float64 ramp = (control*control) * 16.0;
		e[gcount+40000] = e[gcount] = ramp;
		clamp += (e[gcount] / (offsetB+1));
		clamp -= (e[gcount+offsetB] / offsetB);
		if (clamp > wet*8) clamp = wet*8;
		gcount--;

		inputSampleR *= limitOut;
		highIIRR = (highIIRR*0.5);
		highIIRR += (inputSampleR*0.5);
		inputSampleR -= highIIRR;
		highIIR2R = (highIIR2R*0.5);
		highIIR2R += (inputSampleR*0.5);
		inputSampleR -= highIIR2R;
		double slewSampleR = fabs(inputSampleR - lastSampleR);
		lastSampleR = inputSampleR;
		slewSampleR /= fabs(inputSampleR * lastSampleR)+0.2;
		slewIIRR = (slewIIRR*0.5);
		slewIIRR += (slewSampleR*0.5);
		slewSampleR = fabs(slewSampleR - slewIIRR);
		slewIIR2R = (slewIIR2R*0.5);
		slewIIR2R += (slewSampleR*0.5);
		slewSampleR = fabs(slewSampleR - slewIIR2R);
		bridgerectifier = slewSampleR;
		//there's the right channel, now to feed it to overall clamp
		
		if (bridgerectifier > 3.1415) bridgerectifier = 0.0;
		bridgerectifier = sin(bridgerectifier);
		if (gcount < 0 || gcount > 40000) {gcount = 40000;}
		d[gcount+40000] = d[gcount] = bridgerectifier;
		control += (d[gcount] / (offsetA+1));
		control -= (d[gcount+offsetA] / offsetA);
		ramp = (control*control) * 16.0;
		e[gcount+40000] = e[gcount] = ramp;
		clamp += (e[gcount] / (offsetB+1));
		clamp -= (e[gcount+offsetB] / offsetB);
		if (clamp > wet*8) clamp = wet*8;
		gcount--;

		inputSampleL = (drySampleL * (1.0-wet)) + (drySampleL * clamp * wet * 16.0);
		inputSampleR = (drySampleR * (1.0-wet)) + (drySampleR * clamp * wet * 16.0);

		//begin 32 bit stereo floating point dither
		int expon; frexpf((float)inputSampleL, &expon);
		fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
		inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
		frexpf((float)inputSampleR, &expon);
		fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
		inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
		//end 32 bit stereo floating point dither
		
		*outputL = inputSampleL;
		*outputR = inputSampleR;
		
		inputL += 1;
		inputR += 1;
		outputL += 1;
		outputR += 1;
	}
return noErr;
}

