/* ========================================
* Biquad - Biquad.h
* Copyright (c) 2016 airwindows, All rights reserved
* ======================================== */
#ifndef __Biquad_H
#include "Biquad.h"
#endif
void Biquad::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();
int type = ceil((A*3.999)+0.00001);
biquad[0] = ((B*B*B*0.9999)+0.0001)*0.499;
if (biquad[0] < 0.0001) biquad[0] = 0.0001;
biquad[1] = (C*C*C*29.99)+0.01;
if (biquad[1] < 0.0001) biquad[1] = 0.0001;
double wet = (D*2.0)-1.0;
//biquad contains these values:
//[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
//[2] is a0 but you need distinct ones for additional biquad instances so it's here
//[3] is a1 but you need distinct ones for additional biquad instances so it's here
//[4] is a2 but you need distinct ones for additional biquad instances so it's here
//[5] is b1 but you need distinct ones for additional biquad instances so it's here
//[6] is b2 but you need distinct ones for additional biquad instances so it's here
//[7] is LEFT stored delayed sample (freq and res are stored so you can move them sample by sample)
//[8] is LEFT stored delayed sample (you have to include the coefficient making code if you do that)
//[9] is RIGHT stored delayed sample (freq and res are stored so you can move them sample by sample)
//[10] is RIGHT stored delayed sample (you have to include the coefficient making code if you do that)
//to build a dedicated filter, rename 'biquad' to whatever the new filter is, then
//put this code either within the sample buffer (for smoothly modulating freq or res)
//or in this 'read the controls' area (for letting you change freq and res with controls)
//or in 'reset' if the freq and res are absolutely fixed (use GetSampleRate to define freq)
if (type == 1) { //lowpass
double K = tan(M_PI * biquad[0]);
double norm = 1.0 / (1.0 + K / biquad[1] + K * K);
biquad[2] = K * K * norm;
biquad[3] = 2.0 * biquad[2];
biquad[4] = biquad[2];
biquad[5] = 2.0 * (K * K - 1.0) * norm;
biquad[6] = (1.0 - K / biquad[1] + K * K) * norm;
}
if (type == 2) { //highpass
double K = tan(M_PI * biquad[0]);
double norm = 1.0 / (1.0 + K / biquad[1] + K * K);
biquad[2] = norm;
biquad[3] = -2.0 * biquad[2];
biquad[4] = biquad[2];
biquad[5] = 2.0 * (K * K - 1.0) * norm;
biquad[6] = (1.0 - K / biquad[1] + K * K) * norm;
}
if (type == 3) { //bandpass
double K = tan(M_PI * biquad[0]);
double norm = 1.0 / (1.0 + K / biquad[1] + K * K);
biquad[2] = K / biquad[1] * norm;
biquad[3] = 0.0; //bandpass can simplify the biquad kernel: leave out this multiply
biquad[4] = -biquad[2];
biquad[5] = 2.0 * (K * K - 1.0) * norm;
biquad[6] = (1.0 - K / biquad[1] + K * K) * norm;
}
if (type == 4) { //notch
double K = tan(M_PI * biquad[0]);
double norm = 1.0 / (1.0 + K / biquad[1] + K * K);
biquad[2] = (1.0 + K * K) * norm;
biquad[3] = 2.0 * (K * K - 1) * norm;
biquad[4] = biquad[2];
biquad[5] = biquad[3];
biquad[6] = (1.0 - K / biquad[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;
inputSampleL = sin(inputSampleL);
inputSampleR = sin(inputSampleR);
//encode Console5: good cleanness
/*
long double mid = inputSampleL + inputSampleR;
long double side = inputSampleL - inputSampleR;
//assign mid and side.Between these sections, you can do mid/side processing
long double tempSampleM = (mid * biquad[2]) + biquad[7];
biquad[7] = (mid * biquad[3]) - (tempSampleM * biquad[5]) + biquad[8];
biquad[8] = (mid * biquad[4]) - (tempSampleM * biquad[6]);
mid = tempSampleM; //like mono AU, 7 and 8 store mid channel
long double tempSampleS = (side * biquad[2]) + biquad[9];
biquad[9] = (side * biquad[3]) - (tempSampleS * biquad[5]) + biquad[10];
biquad[10] = (side * biquad[4]) - (tempSampleS * biquad[6]);
inputSampleR = tempSampleS; //note: 9 and 10 store the side channel
inputSampleL = (mid+side)/2.0;
inputSampleR = (mid-side)/2.0;
//unassign mid and side
*/
long double tempSampleL = (inputSampleL * biquad[2]) + biquad[7];
biquad[7] = (inputSampleL * biquad[3]) - (tempSampleL * biquad[5]) + biquad[8];
biquad[8] = (inputSampleL * biquad[4]) - (tempSampleL * biquad[6]);
inputSampleL = tempSampleL; //like mono AU, 7 and 8 store L channel
long double tempSampleR = (inputSampleR * biquad[2]) + biquad[9];
biquad[9] = (inputSampleR * biquad[3]) - (tempSampleR * biquad[5]) + biquad[10];
biquad[10] = (inputSampleR * biquad[4]) - (tempSampleR * biquad[6]);
inputSampleR = tempSampleR; //note: 9 and 10 store the R channel
if (inputSampleL > 1.0) inputSampleL = 1.0;
if (inputSampleL < -1.0) inputSampleL = -1.0;
if (inputSampleR > 1.0) inputSampleR = 1.0;
if (inputSampleR < -1.0) inputSampleR = -1.0;
//without this, you can get a NaN condition where it spits out DC offset at full blast!
inputSampleL = asin(inputSampleL);
inputSampleR = asin(inputSampleR);
//amplitude aspect
if (wet < 1.0) {
inputSampleL = (inputSampleL*wet) + (drySampleL*(1.0-fabs(wet)));
inputSampleR = (inputSampleR*wet) + (drySampleR*(1.0-fabs(wet)));
//inv/dry/wet lets us turn LP into HP and band into notch
}
//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 Biquad::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();
int type = ceil((A*3.999)+0.00001);
biquad[0] = ((B*B*B*0.9999)+0.0001)*0.499;
if (biquad[0] < 0.0001) biquad[0] = 0.0001;
biquad[1] = (C*C*C*29.99)+0.01;
if (biquad[1] < 0.0001) biquad[1] = 0.0001;
double wet = (D*2.0)-1.0;
//biquad contains these values:
//[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
//[2] is a0 but you need distinct ones for additional biquad instances so it's here
//[3] is a1 but you need distinct ones for additional biquad instances so it's here
//[4] is a2 but you need distinct ones for additional biquad instances so it's here
//[5] is b1 but you need distinct ones for additional biquad instances so it's here
//[6] is b2 but you need distinct ones for additional biquad instances so it's here
//[7] is LEFT stored delayed sample (freq and res are stored so you can move them sample by sample)
//[8] is LEFT stored delayed sample (you have to include the coefficient making code if you do that)
//[9] is RIGHT stored delayed sample (freq and res are stored so you can move them sample by sample)
//[10] is RIGHT stored delayed sample (you have to include the coefficient making code if you do that)
//to build a dedicated filter, rename 'biquad' to whatever the new filter is, then
//put this code either within the sample buffer (for smoothly modulating freq or res)
//or in this 'read the controls' area (for letting you change freq and res with controls)
//or in 'reset' if the freq and res are absolutely fixed (use GetSampleRate to define freq)
if (type == 1) { //lowpass
double K = tan(M_PI * biquad[0]);
double norm = 1.0 / (1.0 + K / biquad[1] + K * K);
biquad[2] = K * K * norm;
biquad[3] = 2.0 * biquad[2];
biquad[4] = biquad[2];
biquad[5] = 2.0 * (K * K - 1.0) * norm;
biquad[6] = (1.0 - K / biquad[1] + K * K) * norm;
}
if (type == 2) { //highpass
double K = tan(M_PI * biquad[0]);
double norm = 1.0 / (1.0 + K / biquad[1] + K * K);
biquad[2] = norm;
biquad[3] = -2.0 * biquad[2];
biquad[4] = biquad[2];
biquad[5] = 2.0 * (K * K - 1.0) * norm;
biquad[6] = (1.0 - K / biquad[1] + K * K) * norm;
}
if (type == 3) { //bandpass
double K = tan(M_PI * biquad[0]);
double norm = 1.0 / (1.0 + K / biquad[1] + K * K);
biquad[2] = K / biquad[1] * norm;
biquad[3] = 0.0; //bandpass can simplify the biquad kernel: leave out this multiply
biquad[4] = -biquad[2];
biquad[5] = 2.0 * (K * K - 1.0) * norm;
biquad[6] = (1.0 - K / biquad[1] + K * K) * norm;
}
if (type == 4) { //notch
double K = tan(M_PI * biquad[0]);
double norm = 1.0 / (1.0 + K / biquad[1] + K * K);
biquad[2] = (1.0 + K * K) * norm;
biquad[3] = 2.0 * (K * K - 1) * norm;
biquad[4] = biquad[2];
biquad[5] = biquad[3];
biquad[6] = (1.0 - K / biquad[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;
inputSampleL = sin(inputSampleL);
inputSampleR = sin(inputSampleR);
//encode Console5: good cleanness
/*
long double mid = inputSampleL + inputSampleR;
long double side = inputSampleL - inputSampleR;
//assign mid and side.Between these sections, you can do mid/side processing
long double tempSampleM = (mid * biquad[2]) + biquad[7];
biquad[7] = (mid * biquad[3]) - (tempSampleM * biquad[5]) + biquad[8];
biquad[8] = (mid * biquad[4]) - (tempSampleM * biquad[6]);
mid = tempSampleM; //like mono AU, 7 and 8 store mid channel
long double tempSampleS = (side * biquad[2]) + biquad[9];
biquad[9] = (side * biquad[3]) - (tempSampleS * biquad[5]) + biquad[10];
biquad[10] = (side * biquad[4]) - (tempSampleS * biquad[6]);
inputSampleR = tempSampleS; //note: 9 and 10 store the side channel
inputSampleL = (mid+side)/2.0;
inputSampleR = (mid-side)/2.0;
//unassign mid and side
*/
long double tempSampleL = (inputSampleL * biquad[2]) + biquad[7];
biquad[7] = (inputSampleL * biquad[3]) - (tempSampleL * biquad[5]) + biquad[8];
biquad[8] = (inputSampleL * biquad[4]) - (tempSampleL * biquad[6]);
inputSampleL = tempSampleL; //like mono AU, 7 and 8 store L channel
long double tempSampleR = (inputSampleR * biquad[2]) + biquad[9];
biquad[9] = (inputSampleR * biquad[3]) - (tempSampleR * biquad[5]) + biquad[10];
biquad[10] = (inputSampleR * biquad[4]) - (tempSampleR * biquad[6]);
inputSampleR = tempSampleR; //note: 9 and 10 store the R channel
if (inputSampleL > 1.0) inputSampleL = 1.0;
if (inputSampleL < -1.0) inputSampleL = -1.0;
if (inputSampleR > 1.0) inputSampleR = 1.0;
if (inputSampleR < -1.0) inputSampleR = -1.0;
//without this, you can get a NaN condition where it spits out DC offset at full blast!
inputSampleL = asin(inputSampleL);
inputSampleR = asin(inputSampleR);
//amplitude aspect
if (wet < 1.0) {
inputSampleL = (inputSampleL*wet) + (drySampleL*(1.0-fabs(wet)));
inputSampleR = (inputSampleR*wet) + (drySampleR*(1.0-fabs(wet)));
//inv/dry/wet lets us turn LP into HP and band into notch
}
//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++;
}
}
