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287 lines
12 KiB
C++
Executable file
287 lines
12 KiB
C++
Executable file
/* ========================================
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* BiquadPlus - BiquadPlus.h
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* Copyright (c) 2016 airwindows, Airwindows uses the MIT license
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* ======================================== */
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#ifndef __BiquadPlus_H
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#include "BiquadPlus.h"
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#endif
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void BiquadPlus::processReplacing(float **inputs, float **outputs, VstInt32 sampleFrames)
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{
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float* in1 = inputs[0];
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float* in2 = inputs[1];
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float* out1 = outputs[0];
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float* out2 = outputs[1];
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VstInt32 inFramesToProcess = sampleFrames; //vst doesn't give us this as a separate variable so we'll make it
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double overallscale = 1.0;
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overallscale /= 44100.0;
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overallscale *= getSampleRate();
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int type = ceil((A*3.999)+0.00001);
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biquad[biq_freq] = ((B*B*B*20000.0)/getSampleRate());
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if (biquad[biq_freq] < 0.0001) biquad[biq_freq] = 0.0001;
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biquad[biq_reso] = (C*C*C*29.99)+0.01;
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if (biquad[biq_reso] < 0.0001) biquad[biq_reso] = 0.0001;
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double wet = (D*2.0)-1.0;
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//biquad contains these values:
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//[0] is frequency: 0.000001 to 0.499999 is near-zero to near-Nyquist
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//[1] is resonance, 0.7071 is Butterworth. Also can't be zero
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//[2] is a0 but you need distinct ones for additional biquad instances so it's here
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//[3] is a1 but you need distinct ones for additional biquad instances so it's here
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//[4] is a2 but you need distinct ones for additional biquad instances so it's here
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//[5] is b1 but you need distinct ones for additional biquad instances so it's here
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//[6] is b2 but you need distinct ones for additional biquad instances so it's here
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//[7] is LEFT stored delayed sample (freq and res are stored so you can move them sample by sample)
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//[8] is LEFT stored delayed sample (you have to include the coefficient making code if you do that)
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//[9] is RIGHT stored delayed sample (freq and res are stored so you can move them sample by sample)
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//[10] is RIGHT stored delayed sample (you have to include the coefficient making code if you do that)
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//to build a dedicated filter, rename 'biquad' to whatever the new filter is, then
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//put this code either within the sample buffer (for smoothly modulating freq or res)
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//or in this 'read the controls' area (for letting you change freq and res with controls)
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//or in 'reset' if the freq and res are absolutely fixed (use GetSampleRate to define freq)
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biquad[biq_aA0] = biquad[biq_aB0];
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biquad[biq_aA1] = biquad[biq_aB1];
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biquad[biq_aA2] = biquad[biq_aB2];
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biquad[biq_bA1] = biquad[biq_bB1];
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biquad[biq_bA2] = biquad[biq_bB2];
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//previous run through the buffer is still in the filter, so we move it
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//to the A section and now it's the new starting point.
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if (type == 1) { //lowpass
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double K = tan(M_PI * biquad[biq_freq]);
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double norm = 1.0 / (1.0 + K / biquad[biq_reso] + K * K);
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biquad[biq_aB0] = K * K * norm;
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biquad[biq_aB1] = 2.0 * biquad[biq_aB0];
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biquad[biq_aB2] = biquad[biq_aB0];
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biquad[biq_bB1] = 2.0 * (K * K - 1.0) * norm;
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biquad[biq_bB2] = (1.0 - K / biquad[biq_reso] + K * K) * norm;
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}
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if (type == 2) { //highpass
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double K = tan(M_PI * biquad[biq_freq]);
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double norm = 1.0 / (1.0 + K / biquad[biq_reso] + K * K);
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biquad[biq_aB0] = norm;
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biquad[biq_aB1] = -2.0 * biquad[biq_aB0];
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biquad[biq_aB2] = biquad[biq_aB0];
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biquad[biq_bB1] = 2.0 * (K * K - 1.0) * norm;
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biquad[biq_bB2] = (1.0 - K / biquad[biq_reso] + K * K) * norm;
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}
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if (type == 3) { //bandpass
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double K = tan(M_PI * biquad[biq_freq]);
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double norm = 1.0 / (1.0 + K / biquad[biq_reso] + K * K);
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biquad[biq_aB0] = K / biquad[biq_reso] * norm;
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biquad[biq_aB1] = 0.0; //bandpass can simplify the biquad kernel: leave out this multiply
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biquad[biq_aB2] = -biquad[biq_aB0];
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biquad[biq_bB1] = 2.0 * (K * K - 1.0) * norm;
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biquad[biq_bB2] = (1.0 - K / biquad[biq_reso] + K * K) * norm;
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}
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if (type == 4) { //notch
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double K = tan(M_PI * biquad[biq_freq]);
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double norm = 1.0 / (1.0 + K / biquad[biq_reso] + K * K);
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biquad[biq_aB0] = (1.0 + K * K) * norm;
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biquad[biq_aB1] = 2.0 * (K * K - 1) * norm;
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biquad[biq_aB2] = biquad[biq_aB0];
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biquad[biq_bB1] = biquad[biq_aB1];
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biquad[biq_bB2] = (1.0 - K / biquad[biq_reso] + K * K) * norm;
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}
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if (biquad[biq_aA0] == 0.0) { // if we have just started, start directly with raw info
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biquad[biq_aA0] = biquad[biq_aB0];
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biquad[biq_aA1] = biquad[biq_aB1];
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biquad[biq_aA2] = biquad[biq_aB2];
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biquad[biq_bA1] = biquad[biq_bB1];
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biquad[biq_bA2] = biquad[biq_bB2];
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}
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while (--sampleFrames >= 0)
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{
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double inputSampleL = *in1;
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double inputSampleR = *in2;
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if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpdL * 1.18e-17;
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if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
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double drySampleL = inputSampleL;
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double drySampleR = inputSampleR;
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double buf = (double)sampleFrames/inFramesToProcess;
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biquad[biq_a0] = (biquad[biq_aA0]*buf)+(biquad[biq_aB0]*(1.0-buf));
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biquad[biq_a1] = (biquad[biq_aA1]*buf)+(biquad[biq_aB1]*(1.0-buf));
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biquad[biq_a2] = (biquad[biq_aA2]*buf)+(biquad[biq_aB2]*(1.0-buf));
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biquad[biq_b1] = (biquad[biq_bA1]*buf)+(biquad[biq_bB1]*(1.0-buf));
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biquad[biq_b2] = (biquad[biq_bA2]*buf)+(biquad[biq_bB2]*(1.0-buf));
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double tempSample = (inputSampleL * biquad[biq_a0]) + biquad[biq_sL1];
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biquad[biq_sL1] = (inputSampleL * biquad[biq_a1]) - (tempSample * biquad[biq_b1]) + biquad[biq_sL2];
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biquad[biq_sL2] = (inputSampleL * biquad[biq_a2]) - (tempSample * biquad[biq_b2]);
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inputSampleL = tempSample;
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tempSample = (inputSampleR * biquad[biq_a0]) + biquad[biq_sR1];
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biquad[biq_sR1] = (inputSampleR * biquad[biq_a1]) - (tempSample * biquad[biq_b1]) + biquad[biq_sR2];
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biquad[biq_sR2] = (inputSampleR * biquad[biq_a2]) - (tempSample * biquad[biq_b2]);
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inputSampleR = tempSample;
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if (wet < 1.0) {
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inputSampleL = (inputSampleL*wet) + (drySampleL*(1.0-fabs(wet)));
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inputSampleR = (inputSampleR*wet) + (drySampleR*(1.0-fabs(wet)));
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//inv/dry/wet lets us turn LP into HP and band into notch
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}
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//begin 32 bit stereo floating point dither
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int expon; frexpf((float)inputSampleL, &expon);
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fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
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inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
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frexpf((float)inputSampleR, &expon);
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fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
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inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
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//end 32 bit stereo floating point dither
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*out1 = inputSampleL;
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*out2 = inputSampleR;
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in1++;
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in2++;
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out1++;
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out2++;
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}
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}
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void BiquadPlus::processDoubleReplacing(double **inputs, double **outputs, VstInt32 sampleFrames)
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{
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double* in1 = inputs[0];
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double* in2 = inputs[1];
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double* out1 = outputs[0];
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double* out2 = outputs[1];
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VstInt32 inFramesToProcess = sampleFrames; //vst doesn't give us this as a separate variable so we'll make it
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double overallscale = 1.0;
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overallscale /= 44100.0;
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overallscale *= getSampleRate();
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int type = ceil((A*3.999)+0.00001);
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biquad[biq_freq] = ((B*B*B*20000.0)/getSampleRate());
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if (biquad[biq_freq] < 0.0001) biquad[biq_freq] = 0.0001;
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biquad[biq_reso] = (C*C*C*29.99)+0.01;
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if (biquad[biq_reso] < 0.0001) biquad[biq_reso] = 0.0001;
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double wet = (D*2.0)-1.0;
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//to build a dedicated filter, rename 'biquad' to whatever the new filter is, then
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//put this code either within the sample buffer (for smoothly modulating freq or res)
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//or in this 'read the controls' area (for letting you change freq and res with controls)
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//or in 'reset' if the freq and res are absolutely fixed (use GetSampleRate to define freq)
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biquad[biq_aA0] = biquad[biq_aB0];
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biquad[biq_aA1] = biquad[biq_aB1];
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biquad[biq_aA2] = biquad[biq_aB2];
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biquad[biq_bA1] = biquad[biq_bB1];
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biquad[biq_bA2] = biquad[biq_bB2];
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//previous run through the buffer is still in the filter, so we move it
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//to the A section and now it's the new starting point.
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if (type == 1) { //lowpass
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double K = tan(M_PI * biquad[biq_freq]);
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double norm = 1.0 / (1.0 + K / biquad[biq_reso] + K * K);
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biquad[biq_aB0] = K * K * norm;
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biquad[biq_aB1] = 2.0 * biquad[biq_aB0];
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biquad[biq_aB2] = biquad[biq_aB0];
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biquad[biq_bB1] = 2.0 * (K * K - 1.0) * norm;
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biquad[biq_bB2] = (1.0 - K / biquad[biq_reso] + K * K) * norm;
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}
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if (type == 2) { //highpass
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double K = tan(M_PI * biquad[biq_freq]);
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double norm = 1.0 / (1.0 + K / biquad[biq_reso] + K * K);
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biquad[biq_aB0] = norm;
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biquad[biq_aB1] = -2.0 * biquad[biq_aB0];
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biquad[biq_aB2] = biquad[biq_aB0];
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biquad[biq_bB1] = 2.0 * (K * K - 1.0) * norm;
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biquad[biq_bB2] = (1.0 - K / biquad[biq_reso] + K * K) * norm;
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}
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if (type == 3) { //bandpass
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double K = tan(M_PI * biquad[biq_freq]);
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double norm = 1.0 / (1.0 + K / biquad[biq_reso] + K * K);
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biquad[biq_aB0] = K / biquad[biq_reso] * norm;
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biquad[biq_aB1] = 0.0; //bandpass can simplify the biquad kernel: leave out this multiply
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biquad[biq_aB2] = -biquad[biq_aB0];
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biquad[biq_bB1] = 2.0 * (K * K - 1.0) * norm;
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biquad[biq_bB2] = (1.0 - K / biquad[biq_reso] + K * K) * norm;
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}
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if (type == 4) { //notch
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double K = tan(M_PI * biquad[biq_freq]);
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double norm = 1.0 / (1.0 + K / biquad[biq_reso] + K * K);
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biquad[biq_aB0] = (1.0 + K * K) * norm;
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biquad[biq_aB1] = 2.0 * (K * K - 1) * norm;
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biquad[biq_aB2] = biquad[biq_aB0];
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biquad[biq_bB1] = biquad[biq_aB1];
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biquad[biq_bB2] = (1.0 - K / biquad[biq_reso] + K * K) * norm;
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}
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if (biquad[biq_aA0] == 0.0) { // if we have just started, start directly with raw info
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biquad[biq_aA0] = biquad[biq_aB0];
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biquad[biq_aA1] = biquad[biq_aB1];
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biquad[biq_aA2] = biquad[biq_aB2];
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biquad[biq_bA1] = biquad[biq_bB1];
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biquad[biq_bA2] = biquad[biq_bB2];
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}
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while (--sampleFrames >= 0)
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{
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double inputSampleL = *in1;
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double inputSampleR = *in2;
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if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpdL * 1.18e-17;
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if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
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double drySampleL = inputSampleL;
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double drySampleR = inputSampleR;
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double buf = (double)sampleFrames/inFramesToProcess;
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biquad[biq_a0] = (biquad[biq_aA0]*buf)+(biquad[biq_aB0]*(1.0-buf));
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biquad[biq_a1] = (biquad[biq_aA1]*buf)+(biquad[biq_aB1]*(1.0-buf));
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biquad[biq_a2] = (biquad[biq_aA2]*buf)+(biquad[biq_aB2]*(1.0-buf));
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biquad[biq_b1] = (biquad[biq_bA1]*buf)+(biquad[biq_bB1]*(1.0-buf));
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biquad[biq_b2] = (biquad[biq_bA2]*buf)+(biquad[biq_bB2]*(1.0-buf));
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double tempSample = (inputSampleL * biquad[biq_a0]) + biquad[biq_sL1];
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biquad[biq_sL1] = (inputSampleL * biquad[biq_a1]) - (tempSample * biquad[biq_b1]) + biquad[biq_sL2];
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biquad[biq_sL2] = (inputSampleL * biquad[biq_a2]) - (tempSample * biquad[biq_b2]);
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inputSampleL = tempSample;
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tempSample = (inputSampleR * biquad[biq_a0]) + biquad[biq_sR1];
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biquad[biq_sR1] = (inputSampleR * biquad[biq_a1]) - (tempSample * biquad[biq_b1]) + biquad[biq_sR2];
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biquad[biq_sR2] = (inputSampleR * biquad[biq_a2]) - (tempSample * biquad[biq_b2]);
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inputSampleR = tempSample;
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if (wet < 1.0) {
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inputSampleL = (inputSampleL*wet) + (drySampleL*(1.0-fabs(wet)));
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inputSampleR = (inputSampleR*wet) + (drySampleR*(1.0-fabs(wet)));
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//inv/dry/wet lets us turn LP into HP and band into notch
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}
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//begin 64 bit stereo floating point dither
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//int expon; frexp((double)inputSampleL, &expon);
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fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
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//inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
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//frexp((double)inputSampleR, &expon);
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fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
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//inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
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//end 64 bit stereo floating point dither
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*out1 = inputSampleL;
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*out2 = inputSampleR;
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in1++;
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in2++;
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out1++;
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out2++;
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}
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}
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