/* ========================================
* Coils - Coils.h
* Copyright (c) 2016 airwindows, All rights reserved
* ======================================== */
#ifndef __Coils_H
#include "Coils.h"
#endif
void Coils::processReplacing(float **inputs, float **outputs, VstInt32 sampleFrames)
{
float* in1 = inputs[0];
float* in2 = inputs[1];
float* out1 = outputs[0];
float* out2 = outputs[1];
//[0] is frequency: 0.000001 to 0.499999 is near-zero to near-Nyquist
//[1] is resonance, 0.7071 is Butterworth. Also can't be zero
double boost = 1.0-pow(A,2);
if (boost < 0.001) boost = 0.001; //there's a divide, we can't have this be zero
figureL[0] = figureR[0] = 600.0/getSampleRate(); //fixed frequency, 600hz
figureL[1] = figureR[1] = 0.023; //resonance
double offset = (B*2.0)-1.0;
double sinOffset = sin(offset); //we can cache this, it's expensive
double wet = C;
double K = tan(M_PI * figureR[0]);
double norm = 1.0 / (1.0 + K / figureR[1] + K * K);
figureL[2] = figureR[2] = K / figureR[1] * norm;
figureL[4] = figureR[4] = -figureR[2];
figureL[5] = figureR[5] = 2.0 * (K * K - 1.0) * norm;
figureL[6] = figureR[6] = (1.0 - K / figureR[1] + K * K) * norm;
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;
//long double tempSample = (inputSample * figure[2]) + figure[7];
//figure[7] = -(tempSample * figure[5]) + figure[8];
//figure[8] = (inputSample * figure[4]) - (tempSample * figure[6]);
//inputSample = tempSample + sin(drySample-tempSample);
//or
//inputSample = tempSample + ((sin(((drySample-tempSample)/boost)+offset)-sinOffset)*boost);
//
//given a bandlimited inputSample, freq 600hz and Q of 0.023, this restores a lot of
//the full frequencies but distorts like a real transformer. Purest case, and since
//we are not using a high Q we can remove the extra sin/asin on the biquad.
long double tempSample = (inputSampleL * figureL[2]) + figureL[7];
figureL[7] = -(tempSample * figureL[5]) + figureL[8];
figureL[8] = (inputSampleL * figureL[4]) - (tempSample * figureL[6]);
inputSampleL = tempSample + ((sin(((drySampleL-tempSample)/boost)+offset)-sinOffset)*boost);
//given a bandlimited inputSample, freq 600hz and Q of 0.023, this restores a lot of
//the full frequencies but distorts like a real transformer. Since
//we are not using a high Q we can remove the extra sin/asin on the biquad.
tempSample = (inputSampleR * figureR[2]) + figureR[7];
figureR[7] = -(tempSample * figureR[5]) + figureR[8];
figureR[8] = (inputSampleR * figureR[4]) - (tempSample * figureR[6]);
inputSampleR = tempSample + ((sin(((drySampleR-tempSample)/boost)+offset)-sinOffset)*boost);
//given a bandlimited inputSample, freq 600hz and Q of 0.023, this restores a lot of
//the full frequencies but distorts like a real transformer. Since
//we are not using a high Q we can remove the extra sin/asin on the biquad.
if (wet !=1.0) {
inputSampleL = (inputSampleL * wet) + (drySampleL * (1.0-wet));
inputSampleR = (inputSampleR * wet) + (drySampleR * (1.0-wet));
}
//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 Coils::processDoubleReplacing(double **inputs, double **outputs, VstInt32 sampleFrames)
{
double* in1 = inputs[0];
double* in2 = inputs[1];
double* out1 = outputs[0];
double* out2 = outputs[1];
//[0] is frequency: 0.000001 to 0.499999 is near-zero to near-Nyquist
//[1] is resonance, 0.7071 is Butterworth. Also can't be zero
double boost = 1.0-pow(A,2);
if (boost < 0.001) boost = 0.001; //there's a divide, we can't have this be zero
figureL[0] = figureR[0] = 600.0/getSampleRate(); //fixed frequency, 600hz
figureL[1] = figureR[1] = 0.023; //resonance
double offset = (B*2.0)-1.0;
double sinOffset = sin(offset); //we can cache this, it's expensive
double wet = C;
double K = tan(M_PI * figureR[0]);
double norm = 1.0 / (1.0 + K / figureR[1] + K * K);
figureL[2] = figureR[2] = K / figureR[1] * norm;
figureL[4] = figureR[4] = -figureR[2];
figureL[5] = figureR[5] = 2.0 * (K * K - 1.0) * norm;
figureL[6] = figureR[6] = (1.0 - K / figureR[1] + K * K) * norm;
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;
//long double tempSample = (inputSample * figure[2]) + figure[7];
//figure[7] = -(tempSample * figure[5]) + figure[8];
//figure[8] = (inputSample * figure[4]) - (tempSample * figure[6]);
//inputSample = tempSample + sin(drySample-tempSample);
//or
//inputSample = tempSample + ((sin(((drySample-tempSample)/boost)+offset)-sinOffset)*boost);
//
//given a bandlimited inputSample, freq 600hz and Q of 0.023, this restores a lot of
//the full frequencies but distorts like a real transformer. Purest case, and since
//we are not using a high Q we can remove the extra sin/asin on the biquad.
long double tempSample = (inputSampleL * figureL[2]) + figureL[7];
figureL[7] = -(tempSample * figureL[5]) + figureL[8];
figureL[8] = (inputSampleL * figureL[4]) - (tempSample * figureL[6]);
inputSampleL = tempSample + ((sin(((drySampleL-tempSample)/boost)+offset)-sinOffset)*boost);
//given a bandlimited inputSample, freq 600hz and Q of 0.023, this restores a lot of
//the full frequencies but distorts like a real transformer. Since
//we are not using a high Q we can remove the extra sin/asin on the biquad.
tempSample = (inputSampleR * figureR[2]) + figureR[7];
figureR[7] = -(tempSample * figureR[5]) + figureR[8];
figureR[8] = (inputSampleR * figureR[4]) - (tempSample * figureR[6]);
inputSampleR = tempSample + ((sin(((drySampleR-tempSample)/boost)+offset)-sinOffset)*boost);
//given a bandlimited inputSample, freq 600hz and Q of 0.023, this restores a lot of
//the full frequencies but distorts like a real transformer. Since
//we are not using a high Q we can remove the extra sin/asin on the biquad.
if (wet !=1.0) {
inputSampleL = (inputSampleL * wet) + (drySampleL * (1.0-wet));
inputSampleR = (inputSampleR * wet) + (drySampleR * (1.0-wet));
}
//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++;
}
}
