/* ========================================
* Tremolo - Tremolo.h
* Copyright (c) 2016 airwindows, All rights reserved
* ======================================== */
#ifndef __Tremolo_H
#include "Tremolo.h"
#endif
void Tremolo::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();
float fpTemp;
long double fpOld = 0.618033988749894848204586; //golden ratio!
long double fpNew = 1.0 - fpOld;
speedChase = pow(A,4);
depthChase = B;
double speedSpeed = 300 / (fabs( lastSpeed - speedChase)+1.0);
double depthSpeed = 300 / (fabs( lastDepth - depthChase)+1.0);
lastSpeed = speedChase;
lastDepth = depthChase;
double speed;
double depth;
double skew;
double density;
double tupi = 3.141592653589793238;
double control;
double tempcontrol;
double thickness;
double out;
double bridgerectifier;
double offset;
long double inputSampleL;
long double inputSampleR;
long double drySampleL;
long double drySampleR;
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;
speedAmount = (((speedAmount*speedSpeed)+speedChase)/(speedSpeed + 1.0));
depthAmount = (((depthAmount*depthSpeed)+depthChase)/(depthSpeed + 1.0));
speed = 0.0001+(speedAmount/1000.0);
speed /= overallscale;
depth = 1.0 - pow(1.0-depthAmount,5);
skew = 1.0+pow(depthAmount,9);
density = ((1.0-depthAmount)*2.0) - 1.0;
offset = sin(sweep);
sweep += speed;
if (sweep > tupi){sweep -= tupi;}
control = fabs(offset);
if (density > 0)
{
tempcontrol = sin(control);
control = (control * (1.0-density))+(tempcontrol * density);
}
else
{
tempcontrol = 1-cos(control);
control = (control * (1.0+density))+(tempcontrol * -density);
}
//produce either boosted or starved version of control signal
//will go from 0 to 1
thickness = ((control * 2.0) - 1.0)*skew;
out = fabs(thickness);
//do L
bridgerectifier = fabs(inputSampleL);
if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633;
//max value for sine function
if (thickness > 0) bridgerectifier = sin(bridgerectifier);
else bridgerectifier = 1-cos(bridgerectifier);
//produce either boosted or starved version
if (inputSampleL > 0) inputSampleL = (inputSampleL*(1-out))+(bridgerectifier*out);
else inputSampleL = (inputSampleL*(1-out))-(bridgerectifier*out);
//blend according to density control
inputSampleL *= (1.0 - control);
inputSampleL *= 2.0;
//apply tremolo, apply gain boost to compensate for volume loss
inputSampleL = (drySampleL * (1-depth)) + (inputSampleL*depth);
//end L
//do R
bridgerectifier = fabs(inputSampleR);
if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633;
//max value for sine function
if (thickness > 0) bridgerectifier = sin(bridgerectifier);
else bridgerectifier = 1-cos(bridgerectifier);
//produce either boosted or starved version
if (inputSampleR > 0) inputSampleR = (inputSampleR*(1-out))+(bridgerectifier*out);
else inputSampleR = (inputSampleR*(1-out))-(bridgerectifier*out);
//blend according to density control
inputSampleR *= (1.0 - control);
inputSampleR *= 2.0;
//apply tremolo, apply gain boost to compensate for volume loss
inputSampleR = (drySampleR * (1-depth)) + (inputSampleR*depth);
//end R
//noise shaping to 32-bit floating point
if (fpFlip) {
fpTemp = inputSampleL;
fpNShapeLA = (fpNShapeLA*fpOld)+((inputSampleL-fpTemp)*fpNew);
inputSampleL += fpNShapeLA;
fpTemp = inputSampleR;
fpNShapeRA = (fpNShapeRA*fpOld)+((inputSampleR-fpTemp)*fpNew);
inputSampleR += fpNShapeRA;
}
else {
fpTemp = inputSampleL;
fpNShapeLB = (fpNShapeLB*fpOld)+((inputSampleL-fpTemp)*fpNew);
inputSampleL += fpNShapeLB;
fpTemp = inputSampleR;
fpNShapeRB = (fpNShapeRB*fpOld)+((inputSampleR-fpTemp)*fpNew);
inputSampleR += fpNShapeRB;
}
fpFlip = !fpFlip;
//end noise shaping on 32 bit output
*out1 = inputSampleL;
*out2 = inputSampleR;
*in1++;
*in2++;
*out1++;
*out2++;
}
}
void Tremolo::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 fpTemp; //this is different from singlereplacing
long double fpOld = 0.618033988749894848204586; //golden ratio!
long double fpNew = 1.0 - fpOld;
speedChase = pow(A,4);
depthChase = B;
double speedSpeed = 300 / (fabs( lastSpeed - speedChase)+1.0);
double depthSpeed = 300 / (fabs( lastDepth - depthChase)+1.0);
lastSpeed = speedChase;
lastDepth = depthChase;
double speed;
double depth;
double skew;
double density;
double tupi = 3.141592653589793238;
double control;
double tempcontrol;
double thickness;
double out;
double bridgerectifier;
double offset;
long double inputSampleL;
long double inputSampleR;
long double drySampleL;
long double drySampleR;
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;
speedAmount = (((speedAmount*speedSpeed)+speedChase)/(speedSpeed + 1.0));
depthAmount = (((depthAmount*depthSpeed)+depthChase)/(depthSpeed + 1.0));
speed = 0.0001+(speedAmount/1000.0);
speed /= overallscale;
depth = 1.0 - pow(1.0-depthAmount,5);
skew = 1.0+pow(depthAmount,9);
density = ((1.0-depthAmount)*2.0) - 1.0;
offset = sin(sweep);
sweep += speed;
if (sweep > tupi){sweep -= tupi;}
control = fabs(offset);
if (density > 0)
{
tempcontrol = sin(control);
control = (control * (1.0-density))+(tempcontrol * density);
}
else
{
tempcontrol = 1-cos(control);
control = (control * (1.0+density))+(tempcontrol * -density);
}
//produce either boosted or starved version of control signal
//will go from 0 to 1
thickness = ((control * 2.0) - 1.0)*skew;
out = fabs(thickness);
//do L
bridgerectifier = fabs(inputSampleL);
if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633;
//max value for sine function
if (thickness > 0) bridgerectifier = sin(bridgerectifier);
else bridgerectifier = 1-cos(bridgerectifier);
//produce either boosted or starved version
if (inputSampleL > 0) inputSampleL = (inputSampleL*(1-out))+(bridgerectifier*out);
else inputSampleL = (inputSampleL*(1-out))-(bridgerectifier*out);
//blend according to density control
inputSampleL *= (1.0 - control);
inputSampleL *= 2.0;
//apply tremolo, apply gain boost to compensate for volume loss
inputSampleL = (drySampleL * (1-depth)) + (inputSampleL*depth);
//end L
//do R
bridgerectifier = fabs(inputSampleR);
if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633;
//max value for sine function
if (thickness > 0) bridgerectifier = sin(bridgerectifier);
else bridgerectifier = 1-cos(bridgerectifier);
//produce either boosted or starved version
if (inputSampleR > 0) inputSampleR = (inputSampleR*(1-out))+(bridgerectifier*out);
else inputSampleR = (inputSampleR*(1-out))-(bridgerectifier*out);
//blend according to density control
inputSampleR *= (1.0 - control);
inputSampleR *= 2.0;
//apply tremolo, apply gain boost to compensate for volume loss
inputSampleR = (drySampleR * (1-depth)) + (inputSampleR*depth);
//end R
//noise shaping to 64-bit floating point
if (fpFlip) {
fpTemp = inputSampleL;
fpNShapeLA = (fpNShapeLA*fpOld)+((inputSampleL-fpTemp)*fpNew);
inputSampleL += fpNShapeLA;
fpTemp = inputSampleR;
fpNShapeRA = (fpNShapeRA*fpOld)+((inputSampleR-fpTemp)*fpNew);
inputSampleR += fpNShapeRA;
}
else {
fpTemp = inputSampleL;
fpNShapeLB = (fpNShapeLB*fpOld)+((inputSampleL-fpTemp)*fpNew);
inputSampleL += fpNShapeLB;
fpTemp = inputSampleR;
fpNShapeRB = (fpNShapeRB*fpOld)+((inputSampleR-fpTemp)*fpNew);
inputSampleR += fpNShapeRB;
}
fpFlip = !fpFlip;
//end noise shaping on 64 bit output
*out1 = inputSampleL;
*out2 = inputSampleR;
*in1++;
*in2++;
*out1++;
*out2++;
}
}
