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https://github.com/airwindows/airwindows.git
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228 lines
No EOL
7.2 KiB
C++
Executable file
228 lines
No EOL
7.2 KiB
C++
Executable file
/* ========================================
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* NodeDither - NodeDither.h
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* Copyright (c) 2016 airwindows, All rights reserved
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* ======================================== */
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#ifndef __NodeDither_H
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#include "NodeDither.h"
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#endif
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void NodeDither::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 overallscale = 1.0;
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overallscale /= 44100.0;
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overallscale *= getSampleRate();
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int offsetA = (int)((A*100) * overallscale);
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if (offsetA < 1) offsetA = 1;
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if (offsetA > 2440) offsetA = 2440;
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int phase = floor(B*1.999);
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//0 default is out of phase, 1 is in phase
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long double inputSampleL;
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long double inputSampleR;
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double currentDitherL;
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double currentDitherR;
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while (--sampleFrames >= 0)
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{
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inputSampleL = *in1;
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inputSampleR = *in2;
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if (inputSampleL<1.2e-38 && -inputSampleL<1.2e-38) {
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static int noisesource = 0;
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//this declares a variable before anything else is compiled. It won't keep assigning
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//it to 0 for every sample, it's as if the declaration doesn't exist in this context,
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//but it lets me add this denormalization fix in a single place rather than updating
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//it in three different locations. The variable isn't thread-safe but this is only
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//a random seed and we can share it with whatever.
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noisesource = noisesource % 1700021; noisesource++;
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int residue = noisesource * noisesource;
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residue = residue % 170003; residue *= residue;
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residue = residue % 17011; residue *= residue;
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residue = residue % 1709; residue *= residue;
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residue = residue % 173; residue *= residue;
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residue = residue % 17;
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double applyresidue = residue;
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applyresidue *= 0.00000001;
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applyresidue *= 0.00000001;
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inputSampleL = applyresidue;
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}
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if (inputSampleR<1.2e-38 && -inputSampleR<1.2e-38) {
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static int noisesource = 0;
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noisesource = noisesource % 1700021; noisesource++;
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int residue = noisesource * noisesource;
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residue = residue % 170003; residue *= residue;
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residue = residue % 17011; residue *= residue;
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residue = residue % 1709; residue *= residue;
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residue = residue % 173; residue *= residue;
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residue = residue % 17;
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double applyresidue = residue;
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applyresidue *= 0.00000001;
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applyresidue *= 0.00000001;
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inputSampleR = applyresidue;
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//this denormalization routine produces a white noise at -300 dB which the noise
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//shaping will interact with to produce a bipolar output, but the noise is actually
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//all positive. That should stop any variables from going denormal, and the routine
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//only kicks in if digital black is input. As a final touch, if you save to 24-bit
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//the silence will return to being digital black again.
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}
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inputSampleL *= 8388608.0;
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inputSampleR *= 8388608.0;
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//0-1 is now one bit, now we dither
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if (gcount < 0 || gcount > 2450) {gcount = 2450;}
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currentDitherL = (rand()/(double)RAND_MAX);
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inputSampleL += currentDitherL;
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currentDitherR = (rand()/(double)RAND_MAX);
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inputSampleR += currentDitherR;
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if (phase == 1) {
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inputSampleL -= 1.0;
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inputSampleL += dL[gcount+offsetA];
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inputSampleR -= 1.0;
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inputSampleR += dR[gcount+offsetA];
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} else {
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inputSampleL -= dL[gcount+offsetA];
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inputSampleR -= dR[gcount+offsetA];
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}
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//in phase means adding, otherwise we subtract
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inputSampleL = floor(inputSampleL);
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inputSampleR = floor(inputSampleR);
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dL[gcount+2450] = dL[gcount] = currentDitherL;
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dR[gcount+2450] = dR[gcount] = currentDitherR;
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gcount--;
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inputSampleL /= 8388608.0;
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inputSampleR /= 8388608.0;
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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 NodeDither::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 overallscale = 1.0;
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overallscale /= 44100.0;
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overallscale *= getSampleRate();
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int offsetA = (int)((A*100) * overallscale);
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if (offsetA < 1) offsetA = 1;
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if (offsetA > 2440) offsetA = 2440;
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int phase = floor(B*1.999);
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//0 default is out of phase, 1 is in phase
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long double inputSampleL;
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long double inputSampleR;
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double currentDitherL;
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double currentDitherR;
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while (--sampleFrames >= 0)
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{
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inputSampleL = *in1;
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inputSampleR = *in2;
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if (inputSampleL<1.2e-38 && -inputSampleL<1.2e-38) {
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static int noisesource = 0;
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//this declares a variable before anything else is compiled. It won't keep assigning
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//it to 0 for every sample, it's as if the declaration doesn't exist in this context,
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//but it lets me add this denormalization fix in a single place rather than updating
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//it in three different locations. The variable isn't thread-safe but this is only
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//a random seed and we can share it with whatever.
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noisesource = noisesource % 1700021; noisesource++;
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int residue = noisesource * noisesource;
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residue = residue % 170003; residue *= residue;
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residue = residue % 17011; residue *= residue;
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residue = residue % 1709; residue *= residue;
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residue = residue % 173; residue *= residue;
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residue = residue % 17;
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double applyresidue = residue;
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applyresidue *= 0.00000001;
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applyresidue *= 0.00000001;
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inputSampleL = applyresidue;
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}
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if (inputSampleR<1.2e-38 && -inputSampleR<1.2e-38) {
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static int noisesource = 0;
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noisesource = noisesource % 1700021; noisesource++;
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int residue = noisesource * noisesource;
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residue = residue % 170003; residue *= residue;
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residue = residue % 17011; residue *= residue;
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residue = residue % 1709; residue *= residue;
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residue = residue % 173; residue *= residue;
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residue = residue % 17;
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double applyresidue = residue;
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applyresidue *= 0.00000001;
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applyresidue *= 0.00000001;
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inputSampleR = applyresidue;
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//this denormalization routine produces a white noise at -300 dB which the noise
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//shaping will interact with to produce a bipolar output, but the noise is actually
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//all positive. That should stop any variables from going denormal, and the routine
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//only kicks in if digital black is input. As a final touch, if you save to 24-bit
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//the silence will return to being digital black again.
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}
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inputSampleL *= 8388608.0;
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inputSampleR *= 8388608.0;
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//0-1 is now one bit, now we dither
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if (gcount < 0 || gcount > 2450) {gcount = 2450;}
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currentDitherL = (rand()/(double)RAND_MAX);
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inputSampleL += currentDitherL;
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currentDitherR = (rand()/(double)RAND_MAX);
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inputSampleR += currentDitherR;
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if (phase == 1) {
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inputSampleL -= 1.0;
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inputSampleL += dL[gcount+offsetA];
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inputSampleR -= 1.0;
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inputSampleR += dR[gcount+offsetA];
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} else {
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inputSampleL -= dL[gcount+offsetA];
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inputSampleR -= dR[gcount+offsetA];
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}
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//in phase means adding, otherwise we subtract
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inputSampleL = floor(inputSampleL);
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inputSampleR = floor(inputSampleR);
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dL[gcount+2450] = dL[gcount] = currentDitherL;
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dR[gcount+2450] = dR[gcount] = currentDitherR;
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gcount--;
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inputSampleL /= 8388608.0;
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inputSampleR /= 8388608.0;
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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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} |