/* ========================================
 *  Average - Average.h
 *  Copyright (c) 2016 airwindows, All rights reserved
 * ======================================== */

#ifndef __Average_H
#include "Average.h"
#endif

void Average::processReplacing(float **inputs, float **outputs, VstInt32 sampleFrames) 
{
    float* in1  =  inputs[0];
    float* in2  =  inputs[1];
    float* out1 = outputs[0];
    float* out2 = outputs[1];
	
	
	double correctionSample;
	double accumulatorSampleL;
	double accumulatorSampleR;
	double drySampleL;
	double drySampleR;
	double inputSampleL;
	double inputSampleR;
	
	double overallscale = (A * 9.0)+1.0;
	double wet = B;
	double dry = 1.0 - wet;
	double gain = overallscale;
	
	if (gain > 1.0) {f[0] = 1.0; gain -= 1.0;} else {f[0] = gain; gain = 0.0;}
	if (gain > 1.0) {f[1] = 1.0; gain -= 1.0;} else {f[1] = gain; gain = 0.0;}
	if (gain > 1.0) {f[2] = 1.0; gain -= 1.0;} else {f[2] = gain; gain = 0.0;}
	if (gain > 1.0) {f[3] = 1.0; gain -= 1.0;} else {f[3] = gain; gain = 0.0;}
	if (gain > 1.0) {f[4] = 1.0; gain -= 1.0;} else {f[4] = gain; gain = 0.0;}
	if (gain > 1.0) {f[5] = 1.0; gain -= 1.0;} else {f[5] = gain; gain = 0.0;}
	if (gain > 1.0) {f[6] = 1.0; gain -= 1.0;} else {f[6] = gain; gain = 0.0;}
	if (gain > 1.0) {f[7] = 1.0; gain -= 1.0;} else {f[7] = gain; gain = 0.0;}
	if (gain > 1.0) {f[8] = 1.0; gain -= 1.0;} else {f[8] = gain; gain = 0.0;}
	if (gain > 1.0) {f[9] = 1.0; gain -= 1.0;} else {f[9] = gain; gain = 0.0;}
	//there, now we have a neat little moving average with remainders
	
	if (overallscale < 1.0) overallscale = 1.0;
	f[0] /= overallscale;
	f[1] /= overallscale;
	f[2] /= overallscale;
	f[3] /= overallscale;
	f[4] /= overallscale;
	f[5] /= overallscale;
	f[6] /= overallscale;
	f[7] /= overallscale;
	f[8] /= overallscale;
	f[9] /= overallscale;
	//and now it's neatly scaled, too
	
    while (--sampleFrames >= 0)
    {
		inputSampleL = *in1;
		inputSampleR = *in2;
		if (inputSampleL<1.2e-38 && -inputSampleL<1.2e-38) {
			static int noisesource = 0;
			//this declares a variable before anything else is compiled. It won't keep assigning
			//it to 0 for every sample, it's as if the declaration doesn't exist in this context,
			//but it lets me add this denormalization fix in a single place rather than updating
			//it in three different locations. The variable isn't thread-safe but this is only
			//a random seed and we can share it with whatever.
			noisesource = noisesource % 1700021; noisesource++;
			int residue = noisesource * noisesource;
			residue = residue % 170003; residue *= residue;
			residue = residue % 17011; residue *= residue;
			residue = residue % 1709; residue *= residue;
			residue = residue % 173; residue *= residue;
			residue = residue % 17;
			double applyresidue = residue;
			applyresidue *= 0.00000001;
			applyresidue *= 0.00000001;
			inputSampleL = applyresidue;
		}
		if (inputSampleR<1.2e-38 && -inputSampleR<1.2e-38) {
			static int noisesource = 0;
			noisesource = noisesource % 1700021; noisesource++;
			int residue = noisesource * noisesource;
			residue = residue % 170003; residue *= residue;
			residue = residue % 17011; residue *= residue;
			residue = residue % 1709; residue *= residue;
			residue = residue % 173; residue *= residue;
			residue = residue % 17;
			double applyresidue = residue;
			applyresidue *= 0.00000001;
			applyresidue *= 0.00000001;
			inputSampleR = applyresidue;
			//this denormalization routine produces a white noise at -300 dB which the noise
			//shaping will interact with to produce a bipolar output, but the noise is actually
			//all positive. That should stop any variables from going denormal, and the routine
			//only kicks in if digital black is input. As a final touch, if you save to 24-bit
			//the silence will return to being digital black again.
		}
		drySampleL = inputSampleL;
		drySampleR = inputSampleR;

		bL[9] = bL[8]; bL[8] = bL[7]; bL[7] = bL[6]; bL[6] = bL[5];
		bL[5] = bL[4]; bL[4] = bL[3]; bL[3] = bL[2]; bL[2] = bL[1];
		bL[1] = bL[0]; bL[0] = accumulatorSampleL = inputSampleL;

		bR[9] = bR[8]; bR[8] = bR[7]; bR[7] = bR[6]; bR[6] = bR[5];
		bR[5] = bR[4]; bR[4] = bR[3]; bR[3] = bR[2]; bR[2] = bR[1];
		bR[1] = bR[0]; bR[0] = accumulatorSampleR = inputSampleR;
		//primitive way of doing this: for larger batches of samples, you might
		//try using a circular buffer like in a reverb. If you add the new sample
		//and subtract the one on the end you can keep a running tally of the samples
		//between. Beware of tiny floating-point math errors eventually screwing up
		//your system, though!
		
		accumulatorSampleL *= f[0];
		accumulatorSampleL += (bL[1] * f[1]);
		accumulatorSampleL += (bL[2] * f[2]);
		accumulatorSampleL += (bL[3] * f[3]);
		accumulatorSampleL += (bL[4] * f[4]);
		accumulatorSampleL += (bL[5] * f[5]);
		accumulatorSampleL += (bL[6] * f[6]);
		accumulatorSampleL += (bL[7] * f[7]);
		accumulatorSampleL += (bL[8] * f[8]);
		accumulatorSampleL += (bL[9] * f[9]);

		accumulatorSampleR *= f[0];
		accumulatorSampleR += (bR[1] * f[1]);
		accumulatorSampleR += (bR[2] * f[2]);
		accumulatorSampleR += (bR[3] * f[3]);
		accumulatorSampleR += (bR[4] * f[4]);
		accumulatorSampleR += (bR[5] * f[5]);
		accumulatorSampleR += (bR[6] * f[6]);
		accumulatorSampleR += (bR[7] * f[7]);
		accumulatorSampleR += (bR[8] * f[8]);
		accumulatorSampleR += (bR[9] * f[9]);
		//we are doing our repetitive calculations on a separate value
		
		correctionSample = inputSampleL - accumulatorSampleL;
		//we're gonna apply the total effect of all these calculations as a single subtract
		inputSampleL -= correctionSample;

		correctionSample = inputSampleR - accumulatorSampleR;
		inputSampleR -= correctionSample;
		//our one math operation on the input data coming in
		
		if (wet < 1.0) {
			inputSampleL = (inputSampleL * wet) + (drySampleL * dry);
			inputSampleR = (inputSampleR * wet) + (drySampleR * dry);
		}
		//dry/wet control only applies if you're using it. We don't do a multiply by 1.0
		//if it 'won't change anything' but our sample might be at a very different scaling
		//in the floating point system.
		
		
		//stereo 32 bit dither, made small and tidy.
		int expon; frexpf((float)inputSampleL, &expon);
		long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
		inputSampleL += (dither-fpNShapeL); fpNShapeL = dither;
		frexpf((float)inputSampleR, &expon);
		dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
		inputSampleR += (dither-fpNShapeR); fpNShapeR = dither;
		//end 32 bit dither

		*out1 = inputSampleL;
		*out2 = inputSampleR;

		*in1++;
		*in2++;
		*out1++;
		*out2++;
    }
}

void Average::processDoubleReplacing(double **inputs, double **outputs, VstInt32 sampleFrames) 
{
    double* in1  =  inputs[0];
    double* in2  =  inputs[1];
    double* out1 = outputs[0];
    double* out2 = outputs[1];	
	double correctionSample;
	double accumulatorSampleL;
	double accumulatorSampleR;
	double drySampleL;
	double drySampleR;
	double inputSampleL;
	double inputSampleR;
	
	double overallscale = (A * 9.0)+1.0;
	double wet = B;
	double dry = 1.0 - wet;
	double gain = overallscale;
	
	if (gain > 1.0) {f[0] = 1.0; gain -= 1.0;} else {f[0] = gain; gain = 0.0;}
	if (gain > 1.0) {f[1] = 1.0; gain -= 1.0;} else {f[1] = gain; gain = 0.0;}
	if (gain > 1.0) {f[2] = 1.0; gain -= 1.0;} else {f[2] = gain; gain = 0.0;}
	if (gain > 1.0) {f[3] = 1.0; gain -= 1.0;} else {f[3] = gain; gain = 0.0;}
	if (gain > 1.0) {f[4] = 1.0; gain -= 1.0;} else {f[4] = gain; gain = 0.0;}
	if (gain > 1.0) {f[5] = 1.0; gain -= 1.0;} else {f[5] = gain; gain = 0.0;}
	if (gain > 1.0) {f[6] = 1.0; gain -= 1.0;} else {f[6] = gain; gain = 0.0;}
	if (gain > 1.0) {f[7] = 1.0; gain -= 1.0;} else {f[7] = gain; gain = 0.0;}
	if (gain > 1.0) {f[8] = 1.0; gain -= 1.0;} else {f[8] = gain; gain = 0.0;}
	if (gain > 1.0) {f[9] = 1.0; gain -= 1.0;} else {f[9] = gain; gain = 0.0;}
	//there, now we have a neat little moving average with remainders
	
	if (overallscale < 1.0) overallscale = 1.0;
	f[0] /= overallscale;
	f[1] /= overallscale;
	f[2] /= overallscale;
	f[3] /= overallscale;
	f[4] /= overallscale;
	f[5] /= overallscale;
	f[6] /= overallscale;
	f[7] /= overallscale;
	f[8] /= overallscale;
	f[9] /= overallscale;
	//and now it's neatly scaled, too
	
    while (--sampleFrames >= 0)
    {
		inputSampleL = *in1;
		inputSampleR = *in2;
		if (inputSampleL<1.2e-38 && -inputSampleL<1.2e-38) {
			static int noisesource = 0;
			//this declares a variable before anything else is compiled. It won't keep assigning
			//it to 0 for every sample, it's as if the declaration doesn't exist in this context,
			//but it lets me add this denormalization fix in a single place rather than updating
			//it in three different locations. The variable isn't thread-safe but this is only
			//a random seed and we can share it with whatever.
			noisesource = noisesource % 1700021; noisesource++;
			int residue = noisesource * noisesource;
			residue = residue % 170003; residue *= residue;
			residue = residue % 17011; residue *= residue;
			residue = residue % 1709; residue *= residue;
			residue = residue % 173; residue *= residue;
			residue = residue % 17;
			double applyresidue = residue;
			applyresidue *= 0.00000001;
			applyresidue *= 0.00000001;
			inputSampleL = applyresidue;
		}
		if (inputSampleR<1.2e-38 && -inputSampleR<1.2e-38) {
			static int noisesource = 0;
			noisesource = noisesource % 1700021; noisesource++;
			int residue = noisesource * noisesource;
			residue = residue % 170003; residue *= residue;
			residue = residue % 17011; residue *= residue;
			residue = residue % 1709; residue *= residue;
			residue = residue % 173; residue *= residue;
			residue = residue % 17;
			double applyresidue = residue;
			applyresidue *= 0.00000001;
			applyresidue *= 0.00000001;
			inputSampleR = applyresidue;
			//this denormalization routine produces a white noise at -300 dB which the noise
			//shaping will interact with to produce a bipolar output, but the noise is actually
			//all positive. That should stop any variables from going denormal, and the routine
			//only kicks in if digital black is input. As a final touch, if you save to 24-bit
			//the silence will return to being digital black again.
		}
		drySampleL = inputSampleL;
		drySampleR = inputSampleR;
		
		bL[9] = bL[8]; bL[8] = bL[7]; bL[7] = bL[6]; bL[6] = bL[5];
		bL[5] = bL[4]; bL[4] = bL[3]; bL[3] = bL[2]; bL[2] = bL[1];
		bL[1] = bL[0]; bL[0] = accumulatorSampleL = inputSampleL;
		
		bR[9] = bR[8]; bR[8] = bR[7]; bR[7] = bR[6]; bR[6] = bR[5];
		bR[5] = bR[4]; bR[4] = bR[3]; bR[3] = bR[2]; bR[2] = bR[1];
		bR[1] = bR[0]; bR[0] = accumulatorSampleR = inputSampleR;
		//primitive way of doing this: for larger batches of samples, you might
		//try using a circular buffer like in a reverb. If you add the new sample
		//and subtract the one on the end you can keep a running tally of the samples
		//between. Beware of tiny floating-point math errors eventually screwing up
		//your system, though!
		
		accumulatorSampleL *= f[0];
		accumulatorSampleL += (bL[1] * f[1]);
		accumulatorSampleL += (bL[2] * f[2]);
		accumulatorSampleL += (bL[3] * f[3]);
		accumulatorSampleL += (bL[4] * f[4]);
		accumulatorSampleL += (bL[5] * f[5]);
		accumulatorSampleL += (bL[6] * f[6]);
		accumulatorSampleL += (bL[7] * f[7]);
		accumulatorSampleL += (bL[8] * f[8]);
		accumulatorSampleL += (bL[9] * f[9]);
		
		accumulatorSampleR *= f[0];
		accumulatorSampleR += (bR[1] * f[1]);
		accumulatorSampleR += (bR[2] * f[2]);
		accumulatorSampleR += (bR[3] * f[3]);
		accumulatorSampleR += (bR[4] * f[4]);
		accumulatorSampleR += (bR[5] * f[5]);
		accumulatorSampleR += (bR[6] * f[6]);
		accumulatorSampleR += (bR[7] * f[7]);
		accumulatorSampleR += (bR[8] * f[8]);
		accumulatorSampleR += (bR[9] * f[9]);
		//we are doing our repetitive calculations on a separate value
		
		correctionSample = inputSampleL - accumulatorSampleL;
		//we're gonna apply the total effect of all these calculations as a single subtract
		inputSampleL -= correctionSample;
		
		correctionSample = inputSampleR - accumulatorSampleR;
		inputSampleR -= correctionSample;
		//our one math operation on the input data coming in
		
		if (wet < 1.0) {
			inputSampleL = (inputSampleL * wet) + (drySampleL * dry);
			inputSampleR = (inputSampleR * wet) + (drySampleR * dry);
		}
		//dry/wet control only applies if you're using it. We don't do a multiply by 1.0
		//if it 'won't change anything' but our sample might be at a very different scaling
		//in the floating point system.
		
		//stereo 64 bit dither, made small and tidy.
		int expon; frexp((double)inputSampleL, &expon);
		long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
		dither /= 536870912.0; //needs this to scale to 64 bit zone
		inputSampleL += (dither-fpNShapeL); fpNShapeL = dither;
		frexp((double)inputSampleR, &expon);
		dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
		dither /= 536870912.0; //needs this to scale to 64 bit zone
		inputSampleR += (dither-fpNShapeR); fpNShapeR = dither;
		//end 64 bit dither

		*out1 = inputSampleL;
		*out2 = inputSampleR;

		*in1++;
		*in2++;
		*out1++;
		*out2++;
    }
}