/* ========================================
* PurestGain - PurestGain.h
* Copyright (c) 2016 airwindows, All rights reserved
* ======================================== */
#ifndef __PurestGain_H
#include "PurestGain.h"
#endif
void PurestGain::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();
double inputgain = (A * 80.0)-40.0;
if (settingchase != inputgain) {
chasespeed *= 2.0;
settingchase = inputgain;
//increment the slowness for each fader movement
//continuous alteration makes it react smoother
//sudden jump to setting, not so much
}
if (chasespeed > 2500.0) chasespeed = 2500.0;
//bail out if it's too extreme
if (gainchase < -60.0) {
gainchase = pow(10.0,inputgain/20.0);
//shouldn't even be a negative number
//this is about starting at whatever's set, when
//plugin is instantiated.
//Otherwise it's the target, in dB.
}
double targetgain;
//done with top controller
double targetBgain = B;
if (gainBchase < 0.0) gainBchase = targetBgain;
//this one is not a dB value, but straight multiplication
//done with slow fade controller
double outputgain;
long double inputSampleL;
long double inputSampleR;
//A is 0-1 (you can't feed other values to VST hosts, it's always 0-1 internally)
//B is 0-1 and you need to multiply it by 100 if you want to use the 'percent'
//C is 0-1 and if you can use a 0-1 value you can use it directly
//D is 0-1 and you must set global parameters in PurestGain.SetParameter() to use it as a 'popup'
//assign values here, possibly using const values as they won't change in this context
while (--sampleFrames >= 0)
{
targetgain = pow(10.0,settingchase/20.0);
//now we have the target in our temp variable
chasespeed *= 0.9999;
chasespeed -= 0.01;
if (chasespeed < 350.0) chasespeed = 350.0;
//we have our chase speed compensated for recent fader activity
gainchase = (((gainchase*chasespeed)+targetgain)/(chasespeed+1.0));
//gainchase is chasing the target, as a simple multiply gain factor
gainBchase = (((gainBchase*4000)+targetBgain)/4001);
//gainchase is chasing the target, as a simple multiply gain factor
outputgain = gainchase * gainBchase;
//directly multiply the dB gain by the straight multiply gain
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.
}
if (1.0 == outputgain)
{
*out1 = *in1;
*out2 = *in2;
} else {
inputSampleL *= outputgain;
inputSampleR *= outputgain;
//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 PurestGain::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();
double inputgain = (A * 80.0)-40.0;
if (settingchase != inputgain) {
chasespeed *= 2.0;
settingchase = inputgain;
//increment the slowness for each fader movement
//continuous alteration makes it react smoother
//sudden jump to setting, not so much
}
if (chasespeed > 2500.0) chasespeed = 2500.0;
//bail out if it's too extreme
if (gainchase < -60.0) {
gainchase = pow(10.0,inputgain/20.0);
//shouldn't even be a negative number
//this is about starting at whatever's set, when
//plugin is instantiated.
//Otherwise it's the target, in dB.
}
double targetgain;
//done with top controller
double targetBgain = B;
if (gainBchase < 0.0) gainBchase = targetBgain;
//this one is not a dB value, but straight multiplication
//done with slow fade controller
double outputgain;
long double inputSampleL;
long double inputSampleR;
while (--sampleFrames >= 0)
{
targetgain = pow(10.0,settingchase/20.0);
//now we have the target in our temp variable
chasespeed *= 0.9999;
chasespeed -= 0.01;
if (chasespeed < 350.0) chasespeed = 350.0;
//we have our chase speed compensated for recent fader activity
gainchase = (((gainchase*chasespeed)+targetgain)/(chasespeed+1.0));
//gainchase is chasing the target, as a simple multiply gain factor
gainBchase = (((gainBchase*4000)+targetBgain)/4001);
//gainchase is chasing the target, as a simple multiply gain factor
outputgain = gainchase * gainBchase;
//directly multiply the dB gain by the straight multiply gain
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.
}
if (1.0 == outputgain)
{
*out1 = *in1;
*out2 = *in2;
} else {
inputSampleL *= outputgain;
inputSampleR *= outputgain;
//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++;
}
}
