airwindows/plugins/MacVST/uLawEncode/source/uLawEncodeProc.cpp

/* ========================================
 *  uLawEncode - uLawEncode.h
 *  Copyright (c) 2016 airwindows, Airwindows uses the MIT license
 * ======================================== */

#ifndef __uLawEncode_H
#include "uLawEncode.h"
#endif

void uLawEncode::processReplacing(float **inputs, float **outputs, VstInt32 sampleFrames) 
{
    float* in1  =  inputs[0];
    float* in2  =  inputs[1];
    float* out1 = outputs[0];
    float* out2 = outputs[1];

	double overallscale = 1.0;
	overallscale /= 44100.0;
	overallscale *= getSampleRate();

	double gain = A;
	double wet = B;
	//removed extra dry variable
	
    while (--sampleFrames >= 0)
    {
		double inputSampleL = *in1;
		double inputSampleR = *in2;

		static int noisesourceL = 0;
		static int noisesourceR = 850010;
		int residue;
		double applyresidue;
		
		noisesourceL = noisesourceL % 1700021; noisesourceL++;
		residue = noisesourceL * noisesourceL;
		residue = residue % 170003; residue *= residue;
		residue = residue % 17011; residue *= residue;
		residue = residue % 1709; residue *= residue;
		residue = residue % 173; residue *= residue;
		residue = residue % 17;
		applyresidue = residue;
		applyresidue *= 0.00000001;
		applyresidue *= 0.00000001;
		inputSampleL += applyresidue;
		if (inputSampleL<1.2e-38 && -inputSampleL<1.2e-38) {
			inputSampleL -= applyresidue;
		}
		
		noisesourceR = noisesourceR % 1700021; noisesourceR++;
		residue = noisesourceR * noisesourceR;
		residue = residue % 170003; residue *= residue;
		residue = residue % 17011; residue *= residue;
		residue = residue % 1709; residue *= residue;
		residue = residue % 173; residue *= residue;
		residue = residue % 17;
		applyresidue = residue;
		applyresidue *= 0.00000001;
		applyresidue *= 0.00000001;
		inputSampleR += applyresidue;
		if (inputSampleR<1.2e-38 && -inputSampleR<1.2e-38) {
			inputSampleR -= applyresidue;
		}
		//for live air, we always apply the dither noise. Then, if our result is 
		//effectively digital black, we'll subtract it auLawEncode. We want a 'air' hiss
		double drySampleL = inputSampleL;
		double drySampleR = inputSampleR;

		if (gain != 1.0) {
			inputSampleL *= gain;
			inputSampleR *= gain;
		}
		
		if (inputSampleL > 1.0) inputSampleL = 1.0;
		if (inputSampleL < -1.0) inputSampleL = -1.0;
		
		if (inputSampleR > 1.0) inputSampleR = 1.0;
		if (inputSampleR < -1.0) inputSampleR = -1.0;
		
		if (inputSampleL > 0) inputSampleL = log(1.0+(255*fabs(inputSampleL))) / log(256);
		if (inputSampleL < 0) inputSampleL = -log(1.0+(255*fabs(inputSampleL))) / log(256);
		
		if (inputSampleR > 0) inputSampleR = log(1.0+(255*fabs(inputSampleR))) / log(256);
		if (inputSampleR < 0) inputSampleR = -log(1.0+(255*fabs(inputSampleR))) / log(256);
		
		if (wet !=1.0) {
			inputSampleL = (inputSampleL * wet) + (drySampleL * (1.0-wet));
			inputSampleR = (inputSampleR * wet) + (drySampleR * (1.0-wet));
		}
		
		//begin 32 bit stereo floating point dither
		int expon; frexpf((float)inputSampleL, &expon);
		fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
		inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
		frexpf((float)inputSampleR, &expon);
		fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
		inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
		//end 32 bit stereo floating point dither
		
		*out1 = inputSampleL;
		*out2 = inputSampleR;

		*in1++;
		*in2++;
		*out1++;
		*out2++;
    }
}

void uLawEncode::processDoubleReplacing(double **inputs, double **outputs, VstInt32 sampleFrames) 
{
    double* in1  =  inputs[0];
    double* in2  =  inputs[1];
    double* out1 = outputs[0];
    double* out2 = outputs[1];

	double overallscale = 1.0;
	overallscale /= 44100.0;
	overallscale *= getSampleRate();

	double gain = A;
	double wet = B;
	//removed extra dry variable

    while (--sampleFrames >= 0)
    {
		double inputSampleL = *in1;
		double inputSampleR = *in2;

		static int noisesourceL = 0;
		static int noisesourceR = 850010;
		int residue;
		double applyresidue;
		
		noisesourceL = noisesourceL % 1700021; noisesourceL++;
		residue = noisesourceL * noisesourceL;
		residue = residue % 170003; residue *= residue;
		residue = residue % 17011; residue *= residue;
		residue = residue % 1709; residue *= residue;
		residue = residue % 173; residue *= residue;
		residue = residue % 17;
		applyresidue = residue;
		applyresidue *= 0.00000001;
		applyresidue *= 0.00000001;
		inputSampleL += applyresidue;
		if (inputSampleL<1.2e-38 && -inputSampleL<1.2e-38) {
			inputSampleL -= applyresidue;
		}
		
		noisesourceR = noisesourceR % 1700021; noisesourceR++;
		residue = noisesourceR * noisesourceR;
		residue = residue % 170003; residue *= residue;
		residue = residue % 17011; residue *= residue;
		residue = residue % 1709; residue *= residue;
		residue = residue % 173; residue *= residue;
		residue = residue % 17;
		applyresidue = residue;
		applyresidue *= 0.00000001;
		applyresidue *= 0.00000001;
		inputSampleR += applyresidue;
		if (inputSampleR<1.2e-38 && -inputSampleR<1.2e-38) {
			inputSampleR -= applyresidue;
		}
		//for live air, we always apply the dither noise. Then, if our result is 
		//effectively digital black, we'll subtract it auLawEncode. We want a 'air' hiss
		double drySampleL = inputSampleL;
		double drySampleR = inputSampleR;
		
		if (gain != 1.0) {
			inputSampleL *= gain;
			inputSampleR *= gain;
		}
		
		if (inputSampleL > 1.0) inputSampleL = 1.0;
		if (inputSampleL < -1.0) inputSampleL = -1.0;
		
		if (inputSampleR > 1.0) inputSampleR = 1.0;
		if (inputSampleR < -1.0) inputSampleR = -1.0;
		
		if (inputSampleL > 0) inputSampleL = log(1.0+(255*fabs(inputSampleL))) / log(256);
		if (inputSampleL < 0) inputSampleL = -log(1.0+(255*fabs(inputSampleL))) / log(256);
		
		if (inputSampleR > 0) inputSampleR = log(1.0+(255*fabs(inputSampleR))) / log(256);
		if (inputSampleR < 0) inputSampleR = -log(1.0+(255*fabs(inputSampleR))) / log(256);
		
		if (wet !=1.0) {
			inputSampleL = (inputSampleL * wet) + (drySampleL * (1.0-wet));
			inputSampleR = (inputSampleR * wet) + (drySampleR * (1.0-wet));
		}
		
		//begin 64 bit stereo floating point dither
		//int expon; frexp((double)inputSampleL, &expon);
		fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
		//inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
		//frexp((double)inputSampleR, &expon);
		fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
		//inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
		//end 64 bit stereo floating point dither
		
		*out1 = inputSampleL;
		*out2 = inputSampleR;

		*in1++;
		*in2++;
		*out1++;
		*out2++;
    }
}