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Diffstat (limited to 'plugins/LinuxVST/src/Slew/SlewProc.cpp')
| -rwxr-xr-x | plugins/LinuxVST/src/Slew/SlewProc.cpp | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/plugins/LinuxVST/src/Slew/SlewProc.cpp b/plugins/LinuxVST/src/Slew/SlewProc.cpp new file mode 100755 index 0000000..5618bb7 --- /dev/null +++ b/plugins/LinuxVST/src/Slew/SlewProc.cpp @@ -0,0 +1,188 @@ +/* ======================================== + * Slew - Slew.h + * Created 8/12/11 by SPIAdmin + * Copyright (c) 2011 __MyCompanyName__, All rights reserved + * ======================================== */ + +#ifndef __Slew_H +#include "Slew.h" +#endif + +void Slew::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(); + + double inputSampleL; + double inputSampleR; + double outputSampleL; + double outputSampleR; + + double clamp; + double threshold = pow((1-gain),4)/overallscale; + + + + 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. + } + + clamp = inputSampleL - lastSampleL; + outputSampleL = inputSampleL; + if (clamp > threshold) + outputSampleL = lastSampleL + threshold; + if (-clamp > threshold) + outputSampleL = lastSampleL - threshold; + lastSampleL = outputSampleL; + + clamp = inputSampleR - lastSampleR; + outputSampleR = inputSampleR; + if (clamp > threshold) + outputSampleR = lastSampleR + threshold; + if (-clamp > threshold) + outputSampleR = lastSampleR - threshold; + lastSampleR = outputSampleR; + + *out1 = outputSampleL; + *out2 = outputSampleR; + + *in1++; + *in2++; + *out1++; + *out2++; + } +} + +void Slew::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 inputSampleL; + double inputSampleR; + double outputSampleL; + double outputSampleR; + + double clamp; + double threshold = pow((1-gain),4)/overallscale; + + + 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. + } + + clamp = inputSampleL - lastSampleL; + outputSampleL = inputSampleL; + if (clamp > threshold) + outputSampleL = lastSampleL + threshold; + if (-clamp > threshold) + outputSampleL = lastSampleL - threshold; + lastSampleL = outputSampleL; + + clamp = inputSampleR - lastSampleR; + outputSampleR = inputSampleR; + if (clamp > threshold) + outputSampleR = lastSampleR + threshold; + if (-clamp > threshold) + outputSampleR = lastSampleR - threshold; + lastSampleR = outputSampleR; + + *out1 = outputSampleL; + *out2 = outputSampleR; + + *in1++; + *in2++; + *out1++; + *out2++; + } +}
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