mirror of
https://github.com/airwindows/airwindows.git
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153 lines
No EOL
4.3 KiB
C++
Executable file
153 lines
No EOL
4.3 KiB
C++
Executable file
/* ========================================
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* TapeDither - TapeDither.h
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* Copyright (c) 2016 airwindows, Airwindows uses the MIT license
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* ======================================== */
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#ifndef __TapeDither_H
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#include "TapeDither.h"
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#endif
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void TapeDither::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 currentDitherL;
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double currentDitherR;
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int processing = (VstInt32)( A * 1.999 );
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bool highres = false;
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if (processing == 1) highres = true;
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float scaleFactor;
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if (highres) scaleFactor = 8388608.0;
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else scaleFactor = 32768.0;
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float derez = B;
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if (derez > 0.0) scaleFactor *= pow(1.0-derez,6);
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if (scaleFactor < 0.0001) scaleFactor = 0.0001;
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float outScale = scaleFactor;
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if (outScale < 8.0) outScale = 8.0;
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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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fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
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if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
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fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
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inputSampleL *= scaleFactor;
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inputSampleR *= scaleFactor;
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//0-1 is now one bit, now we dither
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currentDitherL = (double(fpdL)/UINT32_MAX);
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currentDitherR = (double(fpdR)/UINT32_MAX);
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inputSampleL += currentDitherL;
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inputSampleR += currentDitherR;
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inputSampleL -= previousDither4L;
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inputSampleR -= previousDither4R;
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inputSampleL = floor(inputSampleL);
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inputSampleR = floor(inputSampleR);
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previousDither4L = previousDither3L;
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previousDither3L = previousDither2L;
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previousDither2L = previousDither1L;
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previousDither1L = currentDitherL;
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previousDither4R = previousDither3R;
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previousDither3R = previousDither2R;
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previousDither2R = previousDither1R;
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previousDither1R = currentDitherR;
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inputSampleL /= outScale;
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inputSampleR /= outScale;
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fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
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fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
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//pseudorandom number updater
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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 TapeDither::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 currentDitherL;
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double currentDitherR;
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int processing = (VstInt32)( A * 1.999 );
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bool highres = false;
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if (processing == 1) highres = true;
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float scaleFactor;
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if (highres) scaleFactor = 8388608.0;
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else scaleFactor = 32768.0;
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float derez = B;
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if (derez > 0.0) scaleFactor *= pow(1.0-derez,6);
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if (scaleFactor < 0.0001) scaleFactor = 0.0001;
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float outScale = scaleFactor;
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if (outScale < 8.0) outScale = 8.0;
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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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fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
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if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
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fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
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inputSampleL *= scaleFactor;
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inputSampleR *= scaleFactor;
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//0-1 is now one bit, now we dither
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currentDitherL = (double(fpdL)/UINT32_MAX);
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currentDitherR = (double(fpdR)/UINT32_MAX);
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inputSampleL += currentDitherL;
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inputSampleR += currentDitherR;
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inputSampleL -= previousDither4L;
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inputSampleR -= previousDither4R;
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inputSampleL = floor(inputSampleL);
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inputSampleR = floor(inputSampleR);
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previousDither4L = previousDither3L;
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previousDither3L = previousDither2L;
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previousDither2L = previousDither1L;
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previousDither1L = currentDitherL;
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previousDither4R = previousDither3R;
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previousDither3R = previousDither2R;
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previousDither2R = previousDither1R;
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previousDither1R = currentDitherR;
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inputSampleL /= outScale;
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inputSampleR /= outScale;
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fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
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fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
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//pseudorandom number updater
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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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} |