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Diffstat (limited to 'plugins/WinVST/Channel4/Channel4Proc.cpp')
| -rwxr-xr-x | plugins/WinVST/Channel4/Channel4Proc.cpp | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/plugins/WinVST/Channel4/Channel4Proc.cpp b/plugins/WinVST/Channel4/Channel4Proc.cpp new file mode 100755 index 0000000..380e52c --- /dev/null +++ b/plugins/WinVST/Channel4/Channel4Proc.cpp @@ -0,0 +1,288 @@ +/* ======================================== + * Channel4 - Channel4.h + * Copyright (c) 2016 airwindows, All rights reserved + * ======================================== */ + +#ifndef __Channel4_H +#include "Channel4.h" +#endif + +void Channel4::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(); + float fpTemp; + double fpOld = 0.618033988749894848204586; //golden ratio! + double fpNew = 1.0 - fpOld; + + const double localiirAmount = iirAmount / overallscale; + const double localthreshold = threshold / overallscale; + const double density = pow(drive,2); //this doesn't relate to the plugins Density and Drive much + double clamp; + long double bridgerectifier; + + long double inputSampleL; + long double inputSampleR; + + while (--sampleFrames >= 0) + { + inputSampleL = *in1; + inputSampleR = *in2; + if (inputSampleL<1.2e-38 && -inputSampleL<1.2e-38) { + static int noisesource = 0; + //this declares a variable before anything else is compiled. It won't keep assigning + //it to 0 for every sample, it's as if the declaration doesn't exist in this context, + //but it lets me add this denormalization fix in a single place rather than updating + //it in three different locations. The variable isn't thread-safe but this is only + //a random seed and we can share it with whatever. + noisesource = noisesource % 1700021; noisesource++; + int residue = noisesource * noisesource; + residue = residue % 170003; residue *= residue; + residue = residue % 17011; residue *= residue; + residue = residue % 1709; residue *= residue; + residue = residue % 173; residue *= residue; + residue = residue % 17; + double applyresidue = residue; + applyresidue *= 0.00000001; + applyresidue *= 0.00000001; + inputSampleL = applyresidue; + } + if (inputSampleR<1.2e-38 && -inputSampleR<1.2e-38) { + static int noisesource = 0; + noisesource = noisesource % 1700021; noisesource++; + int residue = noisesource * noisesource; + residue = residue % 170003; residue *= residue; + residue = residue % 17011; residue *= residue; + residue = residue % 1709; residue *= residue; + residue = residue % 173; residue *= residue; + residue = residue % 17; + double applyresidue = residue; + applyresidue *= 0.00000001; + applyresidue *= 0.00000001; + inputSampleR = applyresidue; + //this denormalization routine produces a white noise at -300 dB which the noise + //shaping will interact with to produce a bipolar output, but the noise is actually + //all positive. That should stop any variables from going denormal, and the routine + //only kicks in if digital black is input. As a final touch, if you save to 24-bit + //the silence will return to being digital black again. + } + + if (fpFlip) + { + iirSampleLA = (iirSampleLA * (1 - localiirAmount)) + (inputSampleL * localiirAmount); + inputSampleL = inputSampleL - iirSampleLA; + iirSampleRA = (iirSampleRA * (1 - localiirAmount)) + (inputSampleR * localiirAmount); + inputSampleR = inputSampleR - iirSampleRA; + } + else + { + iirSampleLB = (iirSampleLB * (1 - localiirAmount)) + (inputSampleL * localiirAmount); + inputSampleL = inputSampleL - iirSampleLB; + iirSampleRB = (iirSampleRB * (1 - localiirAmount)) + (inputSampleR * localiirAmount); + inputSampleR = inputSampleR - iirSampleRB; + } + //highpass section + + bridgerectifier = fabs(inputSampleL)*1.57079633; + if (bridgerectifier > 1.57079633) bridgerectifier = 1.0; + else bridgerectifier = sin(bridgerectifier); + if (inputSampleL > 0) inputSampleL = (inputSampleL*(1-density))+(bridgerectifier*density); + else inputSampleL = (inputSampleL*(1-density))-(bridgerectifier*density); + + bridgerectifier = fabs(inputSampleR)*1.57079633; + if (bridgerectifier > 1.57079633) bridgerectifier = 1.0; + else bridgerectifier = sin(bridgerectifier); + if (inputSampleR > 0) inputSampleR = (inputSampleR*(1-density))+(bridgerectifier*density); + else inputSampleR = (inputSampleR*(1-density))-(bridgerectifier*density); + //drive section + + clamp = inputSampleL - lastSampleL; + if (clamp > localthreshold) + inputSampleL = lastSampleL + localthreshold; + if (-clamp > localthreshold) + inputSampleL = lastSampleL - localthreshold; + lastSampleL = inputSampleL; + + clamp = inputSampleR - lastSampleR; + if (clamp > localthreshold) + inputSampleR = lastSampleR + localthreshold; + if (-clamp > localthreshold) + inputSampleR = lastSampleR - localthreshold; + lastSampleR = inputSampleR; + //slew section + + //noise shaping to 32-bit floating point + if (fpFlip) { + fpTemp = inputSampleL; + fpNShapeLA = (fpNShapeLA*fpOld)+((inputSampleL-fpTemp)*fpNew); + inputSampleL += fpNShapeLA; + fpTemp = inputSampleR; + fpNShapeRA = (fpNShapeRA*fpOld)+((inputSampleR-fpTemp)*fpNew); + inputSampleR += fpNShapeRA; + } + else { + fpTemp = inputSampleL; + fpNShapeLB = (fpNShapeLB*fpOld)+((inputSampleL-fpTemp)*fpNew); + inputSampleL += fpNShapeLB; + fpTemp = inputSampleR; + fpNShapeRB = (fpNShapeRB*fpOld)+((inputSampleR-fpTemp)*fpNew); + inputSampleR += fpNShapeRB; + } + fpFlip = !fpFlip; + //end noise shaping on 32 bit output + + *out1 = inputSampleL; + *out2 = inputSampleR; + + *in1++; + *in2++; + *out1++; + *out2++; + } +} + +void Channel4::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(); + double fpTemp; //this is different from singlereplacing + double fpOld = 0.618033988749894848204586; //golden ratio! + double fpNew = 1.0 - fpOld; + + const double localiirAmount = iirAmount / overallscale; + const double localthreshold = threshold / overallscale; + const double density = pow(drive,2); //this doesn't relate to the plugins Density and Drive much + double clamp; + long double bridgerectifier; + + long double inputSampleL; + long double inputSampleR; + + while (--sampleFrames >= 0) + { + inputSampleL = *in1; + inputSampleR = *in2; + if (inputSampleL<1.2e-38 && -inputSampleL<1.2e-38) { + static int noisesource = 0; + //this declares a variable before anything else is compiled. It won't keep assigning + //it to 0 for every sample, it's as if the declaration doesn't exist in this context, + //but it lets me add this denormalization fix in a single place rather than updating + //it in three different locations. The variable isn't thread-safe but this is only + //a random seed and we can share it with whatever. + noisesource = noisesource % 1700021; noisesource++; + int residue = noisesource * noisesource; + residue = residue % 170003; residue *= residue; + residue = residue % 17011; residue *= residue; + residue = residue % 1709; residue *= residue; + residue = residue % 173; residue *= residue; + residue = residue % 17; + double applyresidue = residue; + applyresidue *= 0.00000001; + applyresidue *= 0.00000001; + inputSampleL = applyresidue; + } + if (inputSampleR<1.2e-38 && -inputSampleR<1.2e-38) { + static int noisesource = 0; + noisesource = noisesource % 1700021; noisesource++; + int residue = noisesource * noisesource; + residue = residue % 170003; residue *= residue; + residue = residue % 17011; residue *= residue; + residue = residue % 1709; residue *= residue; + residue = residue % 173; residue *= residue; + residue = residue % 17; + double applyresidue = residue; + applyresidue *= 0.00000001; + applyresidue *= 0.00000001; + inputSampleR = applyresidue; + //this denormalization routine produces a white noise at -300 dB which the noise + //shaping will interact with to produce a bipolar output, but the noise is actually + //all positive. That should stop any variables from going denormal, and the routine + //only kicks in if digital black is input. As a final touch, if you save to 24-bit + //the silence will return to being digital black again. + } + + if (fpFlip) + { + iirSampleLA = (iirSampleLA * (1 - localiirAmount)) + (inputSampleL * localiirAmount); + inputSampleL = inputSampleL - iirSampleLA; + iirSampleRA = (iirSampleRA * (1 - localiirAmount)) + (inputSampleR * localiirAmount); + inputSampleR = inputSampleR - iirSampleRA; + } + else + { + iirSampleLB = (iirSampleLB * (1 - localiirAmount)) + (inputSampleL * localiirAmount); + inputSampleL = inputSampleL - iirSampleLB; + iirSampleRB = (iirSampleRB * (1 - localiirAmount)) + (inputSampleR * localiirAmount); + inputSampleR = inputSampleR - iirSampleRB; + } + //highpass section + + bridgerectifier = fabs(inputSampleL)*1.57079633; + if (bridgerectifier > 1.57079633) bridgerectifier = 1.0; + else bridgerectifier = sin(bridgerectifier); + if (inputSampleL > 0) inputSampleL = (inputSampleL*(1-density))+(bridgerectifier*density); + else inputSampleL = (inputSampleL*(1-density))-(bridgerectifier*density); + + bridgerectifier = fabs(inputSampleR)*1.57079633; + if (bridgerectifier > 1.57079633) bridgerectifier = 1.0; + else bridgerectifier = sin(bridgerectifier); + if (inputSampleR > 0) inputSampleR = (inputSampleR*(1-density))+(bridgerectifier*density); + else inputSampleR = (inputSampleR*(1-density))-(bridgerectifier*density); + //drive section + + clamp = inputSampleL - lastSampleL; + if (clamp > localthreshold) + inputSampleL = lastSampleL + localthreshold; + if (-clamp > localthreshold) + inputSampleL = lastSampleL - localthreshold; + lastSampleL = inputSampleL; + + clamp = inputSampleR - lastSampleR; + if (clamp > localthreshold) + inputSampleR = lastSampleR + localthreshold; + if (-clamp > localthreshold) + inputSampleR = lastSampleR - localthreshold; + lastSampleR = inputSampleR; + //slew section + + //noise shaping to 64-bit floating point + if (fpFlip) { + fpTemp = inputSampleL; + fpNShapeLA = (fpNShapeLA*fpOld)+((inputSampleL-fpTemp)*fpNew); + inputSampleL += fpNShapeLA; + fpTemp = inputSampleR; + fpNShapeRA = (fpNShapeRA*fpOld)+((inputSampleR-fpTemp)*fpNew); + inputSampleR += fpNShapeRA; + } + else { + fpTemp = inputSampleL; + fpNShapeLB = (fpNShapeLB*fpOld)+((inputSampleL-fpTemp)*fpNew); + inputSampleL += fpNShapeLB; + fpTemp = inputSampleR; + fpNShapeRB = (fpNShapeRB*fpOld)+((inputSampleR-fpTemp)*fpNew); + inputSampleR += fpNShapeRB; + } + fpFlip = !fpFlip; + //end noise shaping on 64 bit output + + *out1 = inputSampleL; + *out2 = inputSampleR; + + *in1++; + *in2++; + *out1++; + *out2++; + } +}
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