diff options
Diffstat (limited to 'plugins/MacVST/TapeDither/source/TapeDitherProc.cpp')
| -rwxr-xr-x | plugins/MacVST/TapeDither/source/TapeDitherProc.cpp | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/plugins/MacVST/TapeDither/source/TapeDitherProc.cpp b/plugins/MacVST/TapeDither/source/TapeDitherProc.cpp new file mode 100755 index 0000000..b45702c --- /dev/null +++ b/plugins/MacVST/TapeDither/source/TapeDitherProc.cpp @@ -0,0 +1,196 @@ +/* ======================================== + * TapeDither - TapeDither.h + * Copyright (c) 2016 airwindows, All rights reserved + * ======================================== */ + +#ifndef __TapeDither_H +#include "TapeDither.h" +#endif + +void TapeDither::processReplacing(float **inputs, float **outputs, VstInt32 sampleFrames) +{ + float* in1 = inputs[0]; + float* in2 = inputs[1]; + float* out1 = outputs[0]; + float* out2 = outputs[1]; + + long double inputSampleL; + long double inputSampleR; + + double currentDitherL; + double currentDitherR; + + 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. + } + + inputSampleL *= 8388608.0; + inputSampleR *= 8388608.0; + //0-1 is now one bit, now we dither + + currentDitherL = (rand()/(double)RAND_MAX); + currentDitherR = (rand()/(double)RAND_MAX); + + inputSampleL += currentDitherL; + inputSampleR += currentDitherR; + inputSampleL -= previousDither4L; + inputSampleR -= previousDither4R; + + inputSampleL = floor(inputSampleL); + inputSampleR = floor(inputSampleR); + + previousDither4L = previousDither3L; + previousDither3L = previousDither2L; + previousDither2L = previousDither1L; + previousDither1L = currentDitherL; + + previousDither4R = previousDither3R; + previousDither3R = previousDither2R; + previousDither2R = previousDither1R; + previousDither1R = currentDitherR; + + inputSampleL /= 8388608.0; + inputSampleR /= 8388608.0; + + *out1 = inputSampleL; + *out2 = inputSampleR; + + *in1++; + *in2++; + *out1++; + *out2++; + } +} + +void TapeDither::processDoubleReplacing(double **inputs, double **outputs, VstInt32 sampleFrames) +{ + double* in1 = inputs[0]; + double* in2 = inputs[1]; + double* out1 = outputs[0]; + double* out2 = outputs[1]; + + long double inputSampleL; + long double inputSampleR; + + double currentDitherL; + double currentDitherR; + + 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. + } + + inputSampleL *= 8388608.0; + inputSampleR *= 8388608.0; + //0-1 is now one bit, now we dither + + currentDitherL = (rand()/(double)RAND_MAX); + currentDitherR = (rand()/(double)RAND_MAX); + + inputSampleL += currentDitherL; + inputSampleR += currentDitherR; + inputSampleL -= previousDither4L; + inputSampleR -= previousDither4R; + + inputSampleL = floor(inputSampleL); + inputSampleR = floor(inputSampleR); + + previousDither4L = previousDither3L; + previousDither3L = previousDither2L; + previousDither2L = previousDither1L; + previousDither1L = currentDitherL; + + previousDither4R = previousDither3R; + previousDither3R = previousDither2R; + previousDither2R = previousDither1R; + previousDither1R = currentDitherR; + + inputSampleL /= 8388608.0; + inputSampleR /= 8388608.0; + + *out1 = inputSampleL; + *out2 = inputSampleR; + + *in1++; + *in2++; + *out1++; + *out2++; + } +}
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