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Diffstat (limited to 'plugins/MacVST/SpatializeDither/source/SpatializeDitherProc.cpp')
| -rwxr-xr-x | plugins/MacVST/SpatializeDither/source/SpatializeDitherProc.cpp | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/plugins/MacVST/SpatializeDither/source/SpatializeDitherProc.cpp b/plugins/MacVST/SpatializeDither/source/SpatializeDitherProc.cpp new file mode 100755 index 0000000..aa092f0 --- /dev/null +++ b/plugins/MacVST/SpatializeDither/source/SpatializeDitherProc.cpp @@ -0,0 +1,244 @@ +/* ======================================== + * SpatializeDither - SpatializeDither.h + * Copyright (c) 2016 airwindows, All rights reserved + * ======================================== */ + +#ifndef __SpatializeDither_H +#include "SpatializeDither.h" +#endif + +void SpatializeDither::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 contingentRnd; + double absSample; + double contingent; + double randyConstant = 1.61803398874989484820458683436563811772030917980576; + double omegaConstant = 0.56714329040978387299996866221035554975381578718651; + double expConstant = 0.06598803584531253707679018759684642493857704825279; + + + 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 + + if (inputSampleL > 0) inputSampleL += 0.383; + if (inputSampleL < 0) inputSampleL -= 0.383; + if (inputSampleR > 0) inputSampleR += 0.383; + if (inputSampleR < 0) inputSampleR -= 0.383; + //adjusting to permit more information drug outta the noisefloor + + contingentRnd = (((rand()/(double)RAND_MAX)+(rand()/(double)RAND_MAX))-1.0) * randyConstant; //produce TPDF dist, scale + contingentRnd -= contingentErrL*omegaConstant; //include err + absSample = fabs(inputSampleL); + contingentErrL = absSample - floor(absSample); //get next err + contingent = contingentErrL * 2.0; //scale of quantization levels + if (contingent > 1.0) contingent = ((-contingent+2.0)*omegaConstant) + expConstant; + else contingent = (contingent * omegaConstant) + expConstant; + //zero is next to a quantization level, one is exactly between them + if (flip) contingentRnd = (contingentRnd * (1.0-contingent)) + contingent + 0.5; + else contingentRnd = (contingentRnd * (1.0-contingent)) - contingent + 0.5; + inputSampleL += (contingentRnd * contingent); + //Contingent Dither + inputSampleL = floor(inputSampleL); + + contingentRnd = (((rand()/(double)RAND_MAX)+(rand()/(double)RAND_MAX))-1.0) * randyConstant; //produce TPDF dist, scale + contingentRnd -= contingentErrR*omegaConstant; //include err + absSample = fabs(inputSampleR); + contingentErrR = absSample - floor(absSample); //get next err + contingent = contingentErrR * 2.0; //scale of quantization levels + if (contingent > 1.0) contingent = ((-contingent+2.0)*omegaConstant) + expConstant; + else contingent = (contingent * omegaConstant) + expConstant; + //zero is next to a quantization level, one is exactly between them + if (flip) contingentRnd = (contingentRnd * (1.0-contingent)) + contingent + 0.5; + else contingentRnd = (contingentRnd * (1.0-contingent)) - contingent + 0.5; + inputSampleR += (contingentRnd * contingent); + //Contingent Dither + inputSampleR = floor(inputSampleR); + + //note: this does not dither for values exactly the same as 16 bit values- + //which forces the dither to gate at 0.0. It goes to digital black, + //and does a teeny parallel-compression thing when almost at digital black. + flip = !flip; + + + inputSampleL /= 8388608.0; + inputSampleR /= 8388608.0; + + *out1 = inputSampleL; + *out2 = inputSampleR; + + *in1++; + *in2++; + *out1++; + *out2++; + } +} + +void SpatializeDither::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 contingentRnd; + double absSample; + double contingent; + double randyConstant = 1.61803398874989484820458683436563811772030917980576; + double omegaConstant = 0.56714329040978387299996866221035554975381578718651; + double expConstant = 0.06598803584531253707679018759684642493857704825279; + + + 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 + + if (inputSampleL > 0) inputSampleL += 0.383; + if (inputSampleL < 0) inputSampleL -= 0.383; + if (inputSampleR > 0) inputSampleR += 0.383; + if (inputSampleR < 0) inputSampleR -= 0.383; + //adjusting to permit more information drug outta the noisefloor + + contingentRnd = (((rand()/(double)RAND_MAX)+(rand()/(double)RAND_MAX))-1.0) * randyConstant; //produce TPDF dist, scale + contingentRnd -= contingentErrL*omegaConstant; //include err + absSample = fabs(inputSampleL); + contingentErrL = absSample - floor(absSample); //get next err + contingent = contingentErrL * 2.0; //scale of quantization levels + if (contingent > 1.0) contingent = ((-contingent+2.0)*omegaConstant) + expConstant; + else contingent = (contingent * omegaConstant) + expConstant; + //zero is next to a quantization level, one is exactly between them + if (flip) contingentRnd = (contingentRnd * (1.0-contingent)) + contingent + 0.5; + else contingentRnd = (contingentRnd * (1.0-contingent)) - contingent + 0.5; + inputSampleL += (contingentRnd * contingent); + //Contingent Dither + inputSampleL = floor(inputSampleL); + + contingentRnd = (((rand()/(double)RAND_MAX)+(rand()/(double)RAND_MAX))-1.0) * randyConstant; //produce TPDF dist, scale + contingentRnd -= contingentErrR*omegaConstant; //include err + absSample = fabs(inputSampleR); + contingentErrR = absSample - floor(absSample); //get next err + contingent = contingentErrR * 2.0; //scale of quantization levels + if (contingent > 1.0) contingent = ((-contingent+2.0)*omegaConstant) + expConstant; + else contingent = (contingent * omegaConstant) + expConstant; + //zero is next to a quantization level, one is exactly between them + if (flip) contingentRnd = (contingentRnd * (1.0-contingent)) + contingent + 0.5; + else contingentRnd = (contingentRnd * (1.0-contingent)) - contingent + 0.5; + inputSampleR += (contingentRnd * contingent); + //Contingent Dither + inputSampleR = floor(inputSampleR); + + //note: this does not dither for values exactly the same as 16 bit values- + //which forces the dither to gate at 0.0. It goes to digital black, + //and does a teeny parallel-compression thing when almost at digital black. + flip = !flip; + + + inputSampleL /= 8388608.0; + inputSampleR /= 8388608.0; + + *out1 = inputSampleL; + *out2 = inputSampleR; + + *in1++; + *in2++; + *out1++; + *out2++; + } +}
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