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206 lines
No EOL
8 KiB
C++
Executable file
206 lines
No EOL
8 KiB
C++
Executable file
/* ========================================
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* SpatializeDither - SpatializeDither.h
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* Copyright (c) 2016 airwindows, Airwindows uses the MIT license
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* ======================================== */
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#ifndef __SpatializeDither_H
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#include "SpatializeDither.h"
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#endif
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void SpatializeDither::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 contingentRnd;
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double absSample;
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double contingent;
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double randyConstant = 1.61803398874989484820458683436563811772030917980576;
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double omegaConstant = 0.56714329040978387299996866221035554975381578718651;
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double expConstant = 0.06598803584531253707679018759684642493857704825279;
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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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if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
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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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if (inputSampleL > 0) inputSampleL += 0.383;
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if (inputSampleL < 0) inputSampleL -= 0.383;
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if (inputSampleR > 0) inputSampleR += 0.383;
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if (inputSampleR < 0) inputSampleR -= 0.383;
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//adjusting to permit more information drug outta the noisefloor
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contingentRnd = (double(fpdL)/UINT32_MAX);
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fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
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contingentRnd += ((double(fpdL)/UINT32_MAX)-1.0);
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contingentRnd *= randyConstant; //produce TPDF dist, scale
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contingentRnd -= contingentErrL*omegaConstant; //include err
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absSample = fabs(inputSampleL);
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contingentErrL = absSample - floor(absSample); //get next err
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contingent = contingentErrL * 2.0; //scale of quantization levels
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if (contingent > 1.0) contingent = ((-contingent+2.0)*omegaConstant) + expConstant;
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else contingent = (contingent * omegaConstant) + expConstant;
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//zero is next to a quantization level, one is exactly between them
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if (flip) contingentRnd = (contingentRnd * (1.0-contingent)) + contingent + 0.5;
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else contingentRnd = (contingentRnd * (1.0-contingent)) - contingent + 0.5;
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inputSampleL += (contingentRnd * contingent);
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//Contingent Dither
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inputSampleL = floor(inputSampleL);
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contingentRnd = (double(fpdR)/UINT32_MAX);
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fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
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contingentRnd += ((double(fpdR)/UINT32_MAX)-1.0);
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contingentRnd *= randyConstant; //produce TPDF dist, scale
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contingentRnd -= contingentErrR*omegaConstant; //include err
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absSample = fabs(inputSampleR);
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contingentErrR = absSample - floor(absSample); //get next err
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contingent = contingentErrR * 2.0; //scale of quantization levels
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if (contingent > 1.0) contingent = ((-contingent+2.0)*omegaConstant) + expConstant;
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else contingent = (contingent * omegaConstant) + expConstant;
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//zero is next to a quantization level, one is exactly between them
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if (flip) contingentRnd = (contingentRnd * (1.0-contingent)) + contingent + 0.5;
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else contingentRnd = (contingentRnd * (1.0-contingent)) - contingent + 0.5;
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inputSampleR += (contingentRnd * contingent);
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//Contingent Dither
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inputSampleR = floor(inputSampleR);
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//note: this does not dither for values exactly the same as 16 bit values-
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//which forces the dither to gate at 0.0. It goes to digital black,
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//and does a teeny parallel-compression thing when almost at digital black.
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flip = !flip;
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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 SpatializeDither::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 contingentRnd;
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double absSample;
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double contingent;
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double randyConstant = 1.61803398874989484820458683436563811772030917980576;
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double omegaConstant = 0.56714329040978387299996866221035554975381578718651;
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double expConstant = 0.06598803584531253707679018759684642493857704825279;
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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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if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
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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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if (inputSampleL > 0) inputSampleL += 0.383;
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if (inputSampleL < 0) inputSampleL -= 0.383;
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if (inputSampleR > 0) inputSampleR += 0.383;
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if (inputSampleR < 0) inputSampleR -= 0.383;
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//adjusting to permit more information drug outta the noisefloor
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contingentRnd = (double(fpdL)/UINT32_MAX);
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fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
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contingentRnd += ((double(fpdL)/UINT32_MAX)-1.0);
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contingentRnd *= randyConstant; //produce TPDF dist, scale
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contingentRnd -= contingentErrL*omegaConstant; //include err
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absSample = fabs(inputSampleL);
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contingentErrL = absSample - floor(absSample); //get next err
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contingent = contingentErrL * 2.0; //scale of quantization levels
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if (contingent > 1.0) contingent = ((-contingent+2.0)*omegaConstant) + expConstant;
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else contingent = (contingent * omegaConstant) + expConstant;
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//zero is next to a quantization level, one is exactly between them
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if (flip) contingentRnd = (contingentRnd * (1.0-contingent)) + contingent + 0.5;
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else contingentRnd = (contingentRnd * (1.0-contingent)) - contingent + 0.5;
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inputSampleL += (contingentRnd * contingent);
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//Contingent Dither
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inputSampleL = floor(inputSampleL);
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contingentRnd = (double(fpdR)/UINT32_MAX);
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fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
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contingentRnd += ((double(fpdR)/UINT32_MAX)-1.0);
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contingentRnd *= randyConstant; //produce TPDF dist, scale
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contingentRnd -= contingentErrR*omegaConstant; //include err
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absSample = fabs(inputSampleR);
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contingentErrR = absSample - floor(absSample); //get next err
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contingent = contingentErrR * 2.0; //scale of quantization levels
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if (contingent > 1.0) contingent = ((-contingent+2.0)*omegaConstant) + expConstant;
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else contingent = (contingent * omegaConstant) + expConstant;
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//zero is next to a quantization level, one is exactly between them
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if (flip) contingentRnd = (contingentRnd * (1.0-contingent)) + contingent + 0.5;
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else contingentRnd = (contingentRnd * (1.0-contingent)) - contingent + 0.5;
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inputSampleR += (contingentRnd * contingent);
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//Contingent Dither
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inputSampleR = floor(inputSampleR);
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//note: this does not dither for values exactly the same as 16 bit values-
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//which forces the dither to gate at 0.0. It goes to digital black,
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//and does a teeny parallel-compression thing when almost at digital black.
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flip = !flip;
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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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} |