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146 lines
4.3 KiB
C++
Executable file
146 lines
4.3 KiB
C++
Executable file
/* ========================================
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* SoftGate - SoftGate.h
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* Copyright (c) 2016 airwindows, Airwindows uses the MIT license
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* ======================================== */
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#ifndef __SoftGate_H
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#include "SoftGate.h"
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#endif
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void SoftGate::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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double overallscale = 1.0;
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overallscale /= 44100.0;
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overallscale *= getSampleRate();
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double threshold = pow(A,6);
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double recovery = pow((B*0.5),6);
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recovery /= overallscale;
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double baseline = pow(C,6);
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double invrec = 1.0 - recovery;
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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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storedL[1] = storedL[0];
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storedL[0] = inputSampleL;
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diffL = storedL[0] - storedL[1];
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storedR[1] = storedR[0];
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storedR[0] = inputSampleR;
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diffR = storedR[0] - storedR[1];
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if (gate > 0) {gate = ((gate-baseline) * invrec) + baseline;}
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if ((fabs(diffR) > threshold) || (fabs(diffL) > threshold)) {gate = 1.1;}
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else {gate = (gate * invrec); if (threshold > 0) {gate += ((fabs(inputSampleL)/threshold) * recovery);gate += ((fabs(inputSampleR)/threshold) * recovery);}}
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if (gate < 0) gate = 0;
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if (gate < 1.0)
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{
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storedL[0] = storedL[1] + (diffL * gate);
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storedR[0] = storedR[1] + (diffR * gate);
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}
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if (gate < 1) {
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inputSampleL = (inputSampleL * gate) + (storedL[0] * (1.0-gate));
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inputSampleR = (inputSampleR * gate) + (storedR[0] * (1.0-gate));
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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 SoftGate::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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double overallscale = 1.0;
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overallscale /= 44100.0;
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overallscale *= getSampleRate();
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double threshold = pow(A,6);
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double recovery = pow((B*0.5),6);
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recovery /= overallscale;
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double baseline = pow(C,6);
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double invrec = 1.0 - recovery;
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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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storedL[1] = storedL[0];
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storedL[0] = inputSampleL;
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diffL = storedL[0] - storedL[1];
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storedR[1] = storedR[0];
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storedR[0] = inputSampleR;
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diffR = storedR[0] - storedR[1];
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if (gate > 0) {gate = ((gate-baseline) * invrec) + baseline;}
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if ((fabs(diffR) > threshold) || (fabs(diffL) > threshold)) {gate = 1.1;}
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else {gate = (gate * invrec); if (threshold > 0) {gate += ((fabs(inputSampleL)/threshold) * recovery);gate += ((fabs(inputSampleR)/threshold) * recovery);}}
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if (gate < 0) gate = 0;
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if (gate < 1.0)
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{
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storedL[0] = storedL[1] + (diffL * gate);
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storedR[0] = storedR[1] + (diffR * gate);
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}
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if (gate < 1) {
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inputSampleL = (inputSampleL * gate) + (storedL[0] * (1.0-gate));
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inputSampleR = (inputSampleR * gate) + (storedR[0] * (1.0-gate));
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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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