/* ========================================
* DeRez - DeRez.h
* Copyright (c) 2016 airwindows, All rights reserved
* ======================================== */
#ifndef __DeRez_H
#include "DeRez.h"
#endif
void DeRez::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 targetA = pow(A,3)+0.0005;
if (targetA > 1.0) targetA = 1.0;
double soften = (1.0 + targetA)/2;
double targetB = pow(1.0-B,3) / 3;
targetA /= overallscale;
while (--sampleFrames >= 0)
{
long double inputSampleL = *in1;
long double inputSampleR = *in2;
if (inputSampleL<1.2e-38 && -inputSampleL<1.2e-38 && (targetB == 0)) {
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 && (targetB == 0)) {
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.
}
long double drySampleL = inputSampleL;
long double drySampleR = inputSampleR;
incrementA = ((incrementA*999.0)+targetA)/1000.0;
incrementB = ((incrementB*999.0)+targetB)/1000.0;
//incrementA is the frequency derez
//incrementB is the bit depth derez
position += incrementA;
long double outputSampleL = heldSampleL;
long double outputSampleR = heldSampleR;
if (position > 1.0)
{
position -= 1.0;
heldSampleL = (lastSampleL * position) + (inputSampleL * (1.0-position));
outputSampleL = (outputSampleL * (1.0-soften)) + (heldSampleL * soften);
//softens the edge of the derez
heldSampleR = (lastSampleR * position) + (inputSampleR * (1.0-position));
outputSampleR = (outputSampleR * (1.0-soften)) + (heldSampleR * soften);
//softens the edge of the derez
}
inputSampleL = outputSampleL;
inputSampleR = outputSampleR;
long double offset;
if (incrementB > 0.0005)
{
if (inputSampleL > 0)
{
offset = inputSampleL;
while (offset > 0) {offset -= incrementB;}
inputSampleL -= offset;
//it's below 0 so subtracting adds the remainder
}
if (inputSampleR > 0)
{
offset = inputSampleR;
while (offset > 0) {offset -= incrementB;}
inputSampleR -= offset;
//it's below 0 so subtracting adds the remainder
}
if (inputSampleL < 0)
{
offset = inputSampleL;
while (offset < 0) {offset += incrementB;}
inputSampleL -= offset;
//it's above 0 so subtracting subtracts the remainder
}
if (inputSampleR < 0)
{
offset = inputSampleR;
while (offset < 0) {offset += incrementB;}
inputSampleR -= offset;
//it's above 0 so subtracting subtracts the remainder
}
inputSampleL *= (1.0 - incrementB);
inputSampleR *= (1.0 - incrementB);
}
lastSampleL = drySampleL;
lastSampleR = drySampleR;
//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 DeRez::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 targetA = pow(A,3)+0.0005;
if (targetA > 1.0) targetA = 1.0;
double soften = (1.0 + targetA)/2;
double targetB = pow(1.0-B,3) / 3;
targetA /= overallscale;
while (--sampleFrames >= 0)
{
long double inputSampleL = *in1;
long double inputSampleR = *in2;
if (inputSampleL<1.2e-38 && -inputSampleL<1.2e-38 && (targetB == 0)) {
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 && (targetB == 0)) {
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.
}
long double drySampleL = inputSampleL;
long double drySampleR = inputSampleR;
incrementA = ((incrementA*999.0)+targetA)/1000.0;
incrementB = ((incrementB*999.0)+targetB)/1000.0;
//incrementA is the frequency derez
//incrementB is the bit depth derez
position += incrementA;
long double outputSampleL = heldSampleL;
long double outputSampleR = heldSampleR;
if (position > 1.0)
{
position -= 1.0;
heldSampleL = (lastSampleL * position) + (inputSampleL * (1.0-position));
outputSampleL = (outputSampleL * (1.0-soften)) + (heldSampleL * soften);
//softens the edge of the derez
heldSampleR = (lastSampleR * position) + (inputSampleR * (1.0-position));
outputSampleR = (outputSampleR * (1.0-soften)) + (heldSampleR * soften);
//softens the edge of the derez
}
inputSampleL = outputSampleL;
inputSampleR = outputSampleR;
long double offset;
if (incrementB > 0.0005)
{
if (inputSampleL > 0)
{
offset = inputSampleL;
while (offset > 0) {offset -= incrementB;}
inputSampleL -= offset;
//it's below 0 so subtracting adds the remainder
}
if (inputSampleR > 0)
{
offset = inputSampleR;
while (offset > 0) {offset -= incrementB;}
inputSampleR -= offset;
//it's below 0 so subtracting adds the remainder
}
if (inputSampleL < 0)
{
offset = inputSampleL;
while (offset < 0) {offset += incrementB;}
inputSampleL -= offset;
//it's above 0 so subtracting subtracts the remainder
}
if (inputSampleR < 0)
{
offset = inputSampleR;
while (offset < 0) {offset += incrementB;}
inputSampleR -= offset;
//it's above 0 so subtracting subtracts the remainder
}
inputSampleL *= (1.0 - incrementB);
inputSampleR *= (1.0 - incrementB);
}
lastSampleL = drySampleL;
lastSampleR = drySampleR;
//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++;
}
}
