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198 lines
6.2 KiB
C++
Executable file
198 lines
6.2 KiB
C++
Executable file
/* ========================================
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* PaulWide - PaulWide.h
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* Copyright (c) 2016 airwindows, Airwindows uses the MIT license
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* ======================================== */
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#ifndef __PaulWide_H
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#include "PaulWide.h"
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#endif
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void PaulWide::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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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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//Paul Frindle: It's true that the dither itself can sound different
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//if it's given a different freq response and you get to hear it.
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//The one we use most is triangular single pole high pass dither.
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//It not freq bent enough sound odd, but is slightly less audible than
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//flat dither. It can also be easily made by taking one sample of dither
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//away from the previous one - this gives you the triangular PDF and the
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//filtering in one go :-)
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double currentDither = (double(fpdL)/UINT32_MAX);
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double ditherL = currentDither;
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ditherL -= previousDitherL;
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previousDitherL = currentDither;
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//TPDF: two 0-1 random noises
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currentDither = (double(fpdR)/UINT32_MAX);
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double ditherR = currentDither;
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ditherR -= previousDitherR;
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previousDitherR = currentDither;
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//TPDF: two 0-1 random noises
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if (fabs(ditherL-ditherR) < 0.5) {
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fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
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currentDither = (double(fpdL)/UINT32_MAX);
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ditherL = currentDither;
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ditherL -= previousDitherL;
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previousDitherL = currentDither;
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}
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if (fabs(ditherL-ditherR) < 0.5) {
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fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
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currentDither = (double(fpdR)/UINT32_MAX);
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ditherR = currentDither;
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ditherR -= previousDitherR;
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previousDitherR = currentDither;
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}
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if (fabs(ditherL-ditherR) < 0.5) {
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fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
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currentDither = (double(fpdL)/UINT32_MAX);
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ditherL = currentDither;
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ditherL -= previousDitherL;
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previousDitherL = currentDither;
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}
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inputSampleL = floor(inputSampleL+ditherL);
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inputSampleR = floor(inputSampleR+ditherR);
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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 PaulWide::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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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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//Paul Frindle: It's true that the dither itself can sound different
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//if it's given a different freq response and you get to hear it.
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//The one we use most is triangular single pole high pass dither.
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//It not freq bent enough sound odd, but is slightly less audible than
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//flat dither. It can also be easily made by taking one sample of dither
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//away from the previous one - this gives you the triangular PDF and the
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//filtering in one go :-)
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double currentDither = (double(fpdL)/UINT32_MAX);
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double ditherL = currentDither;
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ditherL -= previousDitherL;
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previousDitherL = currentDither;
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//TPDF: two 0-1 random noises
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currentDither = (double(fpdR)/UINT32_MAX);
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double ditherR = currentDither;
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ditherR -= previousDitherR;
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previousDitherR = currentDither;
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//TPDF: two 0-1 random noises
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if (fabs(ditherL-ditherR) < 0.5) {
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fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
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currentDither = (double(fpdL)/UINT32_MAX);
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ditherL = currentDither;
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ditherL -= previousDitherL;
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previousDitherL = currentDither;
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}
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if (fabs(ditherL-ditherR) < 0.5) {
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fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
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currentDither = (double(fpdR)/UINT32_MAX);
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ditherR = currentDither;
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ditherR -= previousDitherR;
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previousDitherR = currentDither;
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}
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if (fabs(ditherL-ditherR) < 0.5) {
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fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
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currentDither = (double(fpdL)/UINT32_MAX);
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ditherL = currentDither;
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ditherL -= previousDitherL;
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previousDitherL = currentDither;
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}
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inputSampleL = floor(inputSampleL+ditherL);
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inputSampleR = floor(inputSampleR+ditherR);
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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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