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/* ========================================
* Interstage - Interstage.h
* Copyright (c) 2016 airwindows, All rights reserved
* ======================================== */
#ifndef __Interstage_H
#include "Interstage.h"
#endif
void Interstage::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 firstStage = 0.381966011250105 / overallscale;
double iirAmount = 0.00295 / overallscale;
double threshold = 0.381966011250105 / overallscale;
while (--sampleFrames >= 0)
{
long double inputSampleL = *in1;
long double inputSampleR = *in2;
if (fabs(inputSampleL)<1.18e-37) inputSampleL = fpd * 1.18e-37;
if (fabs(inputSampleR)<1.18e-37) inputSampleR = fpd * 1.18e-37;
long double drySampleL = inputSampleL;
long double drySampleR = inputSampleR;
inputSampleL = (inputSampleL+lastSampleL)*0.5;
inputSampleR = (inputSampleR+lastSampleR)*0.5; //start the lowpassing with an average
if (flip) {
iirSampleAL = (iirSampleAL * (1 - firstStage)) + (inputSampleL * firstStage); inputSampleL = iirSampleAL;
iirSampleCL = (iirSampleCL * (1 - iirAmount)) + (inputSampleL * iirAmount); inputSampleL = iirSampleCL;
iirSampleEL = (iirSampleEL * (1 - iirAmount)) + (inputSampleL * iirAmount); inputSampleL = iirSampleEL;
inputSampleL = drySampleL - inputSampleL;
//make highpass
if (inputSampleL - iirSampleAL > threshold) inputSampleL = iirSampleAL + threshold;
if (inputSampleL - iirSampleAL < -threshold) inputSampleL = iirSampleAL - threshold;
//slew limit against lowpassed reference point
iirSampleAR = (iirSampleAR * (1 - firstStage)) + (inputSampleR * firstStage); inputSampleR = iirSampleAR;
iirSampleCR = (iirSampleCR * (1 - iirAmount)) + (inputSampleR * iirAmount); inputSampleR = iirSampleCR;
iirSampleER = (iirSampleER * (1 - iirAmount)) + (inputSampleR * iirAmount); inputSampleR = iirSampleER;
inputSampleR = drySampleR - inputSampleR;
//make highpass
if (inputSampleR - iirSampleAR > threshold) inputSampleR = iirSampleAR + threshold;
if (inputSampleR - iirSampleAR < -threshold) inputSampleR = iirSampleAR - threshold;
//slew limit against lowpassed reference point
} else {
iirSampleBL = (iirSampleBL * (1 - firstStage)) + (inputSampleL * firstStage); inputSampleL = iirSampleBL;
iirSampleDL = (iirSampleDL * (1 - iirAmount)) + (inputSampleL * iirAmount); inputSampleL = iirSampleDL;
iirSampleFL = (iirSampleFL * (1 - iirAmount)) + (inputSampleL * iirAmount); inputSampleL = iirSampleFL;
inputSampleL = drySampleL - inputSampleL;
//make highpass
if (inputSampleL - iirSampleBL > threshold) inputSampleL = iirSampleBL + threshold;
if (inputSampleL - iirSampleBL < -threshold) inputSampleL = iirSampleBL - threshold;
//slew limit against lowpassed reference point
iirSampleBR = (iirSampleBR * (1 - firstStage)) + (inputSampleR * firstStage); inputSampleR = iirSampleBR;
iirSampleDR = (iirSampleDR * (1 - iirAmount)) + (inputSampleR * iirAmount); inputSampleR = iirSampleDR;
iirSampleFR = (iirSampleFR * (1 - iirAmount)) + (inputSampleR * iirAmount); inputSampleR = iirSampleFR;
inputSampleR = drySampleR - inputSampleR;
//make highpass
if (inputSampleR - iirSampleBR > threshold) inputSampleR = iirSampleBR + threshold;
if (inputSampleR - iirSampleBR < -threshold) inputSampleR = iirSampleBR - threshold;
//slew limit against lowpassed reference point
}
flip = !flip;
lastSampleL = inputSampleL;
lastSampleR = inputSampleR;
//begin 32 bit stereo floating point dither
int expon; frexpf((float)inputSampleL, &expon);
fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
inputSampleL += ((double(fpd)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
frexpf((float)inputSampleR, &expon);
fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
inputSampleR += ((double(fpd)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
//end 32 bit stereo floating point dither
*out1 = inputSampleL;
*out2 = inputSampleR;
*in1++;
*in2++;
*out1++;
*out2++;
}
}
void Interstage::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 firstStage = 0.381966011250105 / overallscale;
double iirAmount = 0.00295 / overallscale;
double threshold = 0.381966011250105 / overallscale;
while (--sampleFrames >= 0)
{
long double inputSampleL = *in1;
long double inputSampleR = *in2;
if (fabs(inputSampleL)<1.18e-43) inputSampleL = fpd * 1.18e-43;
if (fabs(inputSampleR)<1.18e-43) inputSampleR = fpd * 1.18e-43;
long double drySampleL = inputSampleL;
long double drySampleR = inputSampleR;
inputSampleL = (inputSampleL+lastSampleL)*0.5;
inputSampleR = (inputSampleR+lastSampleR)*0.5; //start the lowpassing with an average
if (flip) {
iirSampleAL = (iirSampleAL * (1 - firstStage)) + (inputSampleL * firstStage); inputSampleL = iirSampleAL;
iirSampleCL = (iirSampleCL * (1 - iirAmount)) + (inputSampleL * iirAmount); inputSampleL = iirSampleCL;
iirSampleEL = (iirSampleEL * (1 - iirAmount)) + (inputSampleL * iirAmount); inputSampleL = iirSampleEL;
inputSampleL = drySampleL - inputSampleL;
//make highpass
if (inputSampleL - iirSampleAL > threshold) inputSampleL = iirSampleAL + threshold;
if (inputSampleL - iirSampleAL < -threshold) inputSampleL = iirSampleAL - threshold;
//slew limit against lowpassed reference point
iirSampleAR = (iirSampleAR * (1 - firstStage)) + (inputSampleR * firstStage); inputSampleR = iirSampleAR;
iirSampleCR = (iirSampleCR * (1 - iirAmount)) + (inputSampleR * iirAmount); inputSampleR = iirSampleCR;
iirSampleER = (iirSampleER * (1 - iirAmount)) + (inputSampleR * iirAmount); inputSampleR = iirSampleER;
inputSampleR = drySampleR - inputSampleR;
//make highpass
if (inputSampleR - iirSampleAR > threshold) inputSampleR = iirSampleAR + threshold;
if (inputSampleR - iirSampleAR < -threshold) inputSampleR = iirSampleAR - threshold;
//slew limit against lowpassed reference point
} else {
iirSampleBL = (iirSampleBL * (1 - firstStage)) + (inputSampleL * firstStage); inputSampleL = iirSampleBL;
iirSampleDL = (iirSampleDL * (1 - iirAmount)) + (inputSampleL * iirAmount); inputSampleL = iirSampleDL;
iirSampleFL = (iirSampleFL * (1 - iirAmount)) + (inputSampleL * iirAmount); inputSampleL = iirSampleFL;
inputSampleL = drySampleL - inputSampleL;
//make highpass
if (inputSampleL - iirSampleBL > threshold) inputSampleL = iirSampleBL + threshold;
if (inputSampleL - iirSampleBL < -threshold) inputSampleL = iirSampleBL - threshold;
//slew limit against lowpassed reference point
iirSampleBR = (iirSampleBR * (1 - firstStage)) + (inputSampleR * firstStage); inputSampleR = iirSampleBR;
iirSampleDR = (iirSampleDR * (1 - iirAmount)) + (inputSampleR * iirAmount); inputSampleR = iirSampleDR;
iirSampleFR = (iirSampleFR * (1 - iirAmount)) + (inputSampleR * iirAmount); inputSampleR = iirSampleFR;
inputSampleR = drySampleR - inputSampleR;
//make highpass
if (inputSampleR - iirSampleBR > threshold) inputSampleR = iirSampleBR + threshold;
if (inputSampleR - iirSampleBR < -threshold) inputSampleR = iirSampleBR - threshold;
//slew limit against lowpassed reference point
}
flip = !flip;
lastSampleL = inputSampleL;
lastSampleR = inputSampleR;
//begin 64 bit stereo floating point dither
int expon; frexp((double)inputSampleL, &expon);
fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
inputSampleL += ((double(fpd)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
frexp((double)inputSampleR, &expon);
fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
inputSampleR += ((double(fpd)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
//end 64 bit stereo floating point dither
*out1 = inputSampleL;
*out2 = inputSampleR;
*in1++;
*in2++;
*out1++;
*out2++;
}
}
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