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194 lines
No EOL
6 KiB
C++
Executable file
194 lines
No EOL
6 KiB
C++
Executable file
/* ========================================
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* PurestGain - PurestGain.h
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* Copyright (c) 2016 airwindows, Airwindows uses the MIT license
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* ======================================== */
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#ifndef __PurestGain_H
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#include "PurestGain.h"
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#endif
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void PurestGain::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 inputgain = (A * 80.0)-40.0;
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if (settingchase != inputgain) {
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chasespeed *= 2.0;
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settingchase = inputgain;
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//increment the slowness for each fader movement
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//continuous alteration makes it react smoother
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//sudden jump to setting, not so much
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}
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if (chasespeed > 2500.0) chasespeed = 2500.0;
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//bail out if it's too extreme
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if (gainchase < -60.0) {
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gainchase = pow(10.0,inputgain/20.0);
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//shouldn't even be a negative number
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//this is about starting at whatever's set, when
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//plugin is instantiated.
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//Otherwise it's the target, in dB.
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}
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double targetgain;
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//done with top controller
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double targetBgain = B;
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if (gainBchase < 0.0) gainBchase = targetBgain;
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//this one is not a dB value, but straight multiplication
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//done with slow fade controller
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double outputgain;
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double inputSampleL;
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double inputSampleR;
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//A is 0-1 (you can't feed other values to VST hosts, it's always 0-1 internally)
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//B is 0-1 and you need to multiply it by 100 if you want to use the 'percent'
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//C is 0-1 and if you can use a 0-1 value you can use it directly
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//D is 0-1 and you must set global parameters in PurestGain.SetParameter() to use it as a 'popup'
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//assign values here, possibly using const values as they won't change in this context
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while (--sampleFrames >= 0)
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{
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targetgain = pow(10.0,settingchase/20.0);
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//now we have the target in our temp variable
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chasespeed *= 0.9999;
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chasespeed -= 0.01;
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if (chasespeed < 350.0) chasespeed = 350.0;
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//we have our chase speed compensated for recent fader activity
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gainchase = (((gainchase*chasespeed)+targetgain)/(chasespeed+1.0));
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//gainchase is chasing the target, as a simple multiply gain factor
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gainBchase = (((gainBchase*4000)+targetBgain)/4001);
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//gainchase is chasing the target, as a simple multiply gain factor
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outputgain = gainchase * gainBchase;
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//directly multiply the dB gain by the straight multiply gain
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inputSampleL = *in1;
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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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if (1.0 == outputgain)
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{
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*out1 = *in1;
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*out2 = *in2;
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} else {
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inputSampleL *= outputgain;
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inputSampleR *= outputgain;
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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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}
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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 PurestGain::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 inputgain = (A * 80.0)-40.0;
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if (settingchase != inputgain) {
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chasespeed *= 2.0;
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settingchase = inputgain;
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//increment the slowness for each fader movement
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//continuous alteration makes it react smoother
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//sudden jump to setting, not so much
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}
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if (chasespeed > 2500.0) chasespeed = 2500.0;
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//bail out if it's too extreme
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if (gainchase < -60.0) {
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gainchase = pow(10.0,inputgain/20.0);
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//shouldn't even be a negative number
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//this is about starting at whatever's set, when
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//plugin is instantiated.
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//Otherwise it's the target, in dB.
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}
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double targetgain;
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//done with top controller
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double targetBgain = B;
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if (gainBchase < 0.0) gainBchase = targetBgain;
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//this one is not a dB value, but straight multiplication
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//done with slow fade controller
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double outputgain;
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double inputSampleL;
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double inputSampleR;
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while (--sampleFrames >= 0)
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{
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targetgain = pow(10.0,settingchase/20.0);
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//now we have the target in our temp variable
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chasespeed *= 0.9999;
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chasespeed -= 0.01;
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if (chasespeed < 350.0) chasespeed = 350.0;
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//we have our chase speed compensated for recent fader activity
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gainchase = (((gainchase*chasespeed)+targetgain)/(chasespeed+1.0));
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//gainchase is chasing the target, as a simple multiply gain factor
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gainBchase = (((gainBchase*4000)+targetBgain)/4001);
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//gainchase is chasing the target, as a simple multiply gain factor
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outputgain = gainchase * gainBchase;
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//directly multiply the dB gain by the straight multiply gain
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inputSampleL = *in1;
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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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if (1.0 == outputgain)
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{
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*out1 = *in1;
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*out2 = *in2;
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} else {
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inputSampleL *= outputgain;
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inputSampleR *= outputgain;
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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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}
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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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} |