/* ========================================
* StereoFX - StereoFX.h
* Copyright (c) 2016 airwindows, All rights reserved
* ======================================== */
#ifndef __StereoFX_H
#include "StereoFX.h"
#endif
void StereoFX::processReplacing(float **inputs, float **outputs, VstInt32 sampleFrames)
{
float* in1 = inputs[0];
float* in2 = inputs[1];
float* out1 = outputs[0];
float* out2 = outputs[1];
double overallscale = 1.0;
overallscale /= 44100.0;
overallscale *= getSampleRate();
long double inputSampleL;
long double inputSampleR;
long double mid;
long double side;
//High Impact section
double stereowide = A;
double centersquish = C;
double density = stereowide * 2.4;
double sustain = 1.0 - (1.0/(1.0 + (density/7.0)));
//this way, enhance increases up to 50% and then mid falls off beyond that
double bridgerectifier;
double count;
//Highpass section
double iirAmount = pow(B,3)/overallscale;
double tight = -0.33333333333333;
double offset;
//we are setting it up so that to either extreme we can get an audible sound,
//but sort of scaled so small adjustments don't shift the cutoff frequency yet.
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.
}
//assign working variables
mid = inputSampleL + inputSampleR;
side = inputSampleL - inputSampleR;
//assign mid and side. Now, High Impact code
count = density;
while (count > 1.0)
{
bridgerectifier = fabs(side)*1.57079633;
if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633;
//max value for sine function
bridgerectifier = sin(bridgerectifier);
if (side > 0.0) side = bridgerectifier;
else side = -bridgerectifier;
count = count - 1.0;
}
//we have now accounted for any really high density settings.
bridgerectifier = fabs(side)*1.57079633;
if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633;
//max value for sine function
bridgerectifier = sin(bridgerectifier);
if (side > 0) side = (side*(1-count))+(bridgerectifier*count);
else side = (side*(1-count))-(bridgerectifier*count);
//blend according to density control
//done first density. Next, sustain-reducer
bridgerectifier = fabs(side)*1.57079633;
if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633;
bridgerectifier = (1-cos(bridgerectifier))*3.141592653589793;
if (side > 0) side = (side*(1-sustain))+(bridgerectifier*sustain);
else side = (side*(1-sustain))-(bridgerectifier*sustain);
//done with High Impact code
//now, Highpass code
offset = 0.666666666666666 + ((1-fabs(side))*tight);
if (offset < 0) offset = 0;
if (offset > 1) offset = 1;
if (flip)
{
iirSampleA = (iirSampleA * (1 - (offset * iirAmount))) + (side * (offset * iirAmount));
side = side - iirSampleA;
}
else
{
iirSampleB = (iirSampleB * (1 - (offset * iirAmount))) + (side * (offset * iirAmount));
side = side - iirSampleB;
}
//done with Highpass code
bridgerectifier = fabs(mid)/1.273239544735162;
if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633;
bridgerectifier = sin(bridgerectifier)*1.273239544735162;
if (mid > 0) mid = (mid*(1-centersquish))+(bridgerectifier*centersquish);
else mid = (mid*(1-centersquish))-(bridgerectifier*centersquish);
//done with the mid saturating section.
inputSampleL = (mid+side)/2.0;
inputSampleR = (mid-side)/2.0;
//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 StereoFX::processDoubleReplacing(double **inputs, double **outputs, VstInt32 sampleFrames)
{
double* in1 = inputs[0];
double* in2 = inputs[1];
double* out1 = outputs[0];
double* out2 = outputs[1];
double overallscale = 1.0;
overallscale /= 44100.0;
overallscale *= getSampleRate();
long double inputSampleL;
long double inputSampleR;
long double mid;
long double side;
//High Impact section
double stereowide = A;
double centersquish = C;
double density = stereowide * 2.4;
double sustain = 1.0 - (1.0/(1.0 + (density/7.0)));
//this way, enhance increases up to 50% and then mid falls off beyond that
double bridgerectifier;
double count;
//Highpass section
double iirAmount = pow(B,3)/overallscale;
double tight = -0.33333333333333;
double offset;
//we are setting it up so that to either extreme we can get an audible sound,
//but sort of scaled so small adjustments don't shift the cutoff frequency yet.
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.
}
//assign working variables
mid = inputSampleL + inputSampleR;
side = inputSampleL - inputSampleR;
//assign mid and side. Now, High Impact code
count = density;
while (count > 1.0)
{
bridgerectifier = fabs(side)*1.57079633;
if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633;
//max value for sine function
bridgerectifier = sin(bridgerectifier);
if (side > 0.0) side = bridgerectifier;
else side = -bridgerectifier;
count = count - 1.0;
}
//we have now accounted for any really high density settings.
bridgerectifier = fabs(side)*1.57079633;
if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633;
//max value for sine function
bridgerectifier = sin(bridgerectifier);
if (side > 0) side = (side*(1-count))+(bridgerectifier*count);
else side = (side*(1-count))-(bridgerectifier*count);
//blend according to density control
//done first density. Next, sustain-reducer
bridgerectifier = fabs(side)*1.57079633;
if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633;
bridgerectifier = (1-cos(bridgerectifier))*3.141592653589793;
if (side > 0) side = (side*(1-sustain))+(bridgerectifier*sustain);
else side = (side*(1-sustain))-(bridgerectifier*sustain);
//done with High Impact code
//now, Highpass code
offset = 0.666666666666666 + ((1-fabs(side))*tight);
if (offset < 0) offset = 0;
if (offset > 1) offset = 1;
if (flip)
{
iirSampleA = (iirSampleA * (1 - (offset * iirAmount))) + (side * (offset * iirAmount));
side = side - iirSampleA;
}
else
{
iirSampleB = (iirSampleB * (1 - (offset * iirAmount))) + (side * (offset * iirAmount));
side = side - iirSampleB;
}
//done with Highpass code
bridgerectifier = fabs(mid)/1.273239544735162;
if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633;
bridgerectifier = sin(bridgerectifier)*1.273239544735162;
if (mid > 0) mid = (mid*(1-centersquish))+(bridgerectifier*centersquish);
else mid = (mid*(1-centersquish))-(bridgerectifier*centersquish);
//done with the mid saturating section.
inputSampleL = (mid+side)/2.0;
inputSampleR = (mid-side)/2.0;
//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++;
}
}
