Floating Point Dither For All

4 files changed, 22 insertions, 54 deletions

diff --git a/plugins/WinVST/Aura/.vs/VSTProject/v14/.suo b/plugins/WinVST/Aura/.vs/VSTProject/v14/.suo
index 885f4c3..ef870fa 100755
--- a/plugins/WinVST/Aura/.vs/VSTProject/v14/.suo
+++ b/plugins/WinVST/Aura/.vs/VSTProject/v14/.suo
diff --git a/plugins/WinVST/Aura/Aura.cpp b/plugins/WinVST/Aura/Aura.cpp
index d011564..8663d3b 100755
--- a/plugins/WinVST/Aura/Aura.cpp
+++ b/plugins/WinVST/Aura/Aura.cpp
@@ -24,11 +24,8 @@ Aura::Aura(audioMasterCallback audioMaster) :
 	lastSampleR = 0.0;
 	previousVelocityR = 0.0;
 
-	fpNShapeLA = 0.0;
-	fpNShapeLB = 0.0;
-	fpNShapeRA = 0.0;
-	fpNShapeRB = 0.0;
-	fpFlip = true;
+	fpNShapeL = 0.0;
+	fpNShapeR = 0.0;
 	//this is reset: values being initialized only once. Startup values, whatever they are.
 	
     _canDo.insert("plugAsChannelInsert"); // plug-in can be used as a channel insert effect.
diff --git a/plugins/WinVST/Aura/Aura.h b/plugins/WinVST/Aura/Aura.h
index 557169d..22d4653 100755
--- a/plugins/WinVST/Aura/Aura.h
+++ b/plugins/WinVST/Aura/Aura.h
@@ -53,11 +53,8 @@ private:
     char _programName[kVstMaxProgNameLen + 1];
     std::set< std::string > _canDo;
     
-	long double fpNShapeLA;
-	long double fpNShapeLB;
-	long double fpNShapeRA;
-	long double fpNShapeRB;
-	bool fpFlip;
+	long double fpNShapeL;
+	long double fpNShapeR;
 	//default stuff
 	long double lastSampleL;
 	double previousVelocityL;
diff --git a/plugins/WinVST/Aura/AuraProc.cpp b/plugins/WinVST/Aura/AuraProc.cpp
index daf54d6..089a873 100755
--- a/plugins/WinVST/Aura/AuraProc.cpp
+++ b/plugins/WinVST/Aura/AuraProc.cpp
@@ -14,9 +14,6 @@ void Aura::processReplacing(float **inputs, float **outputs, VstInt32 sampleFram
     float* out1 = outputs[0];
     float* out2 = outputs[1];
 
-	float fpTemp;
-	long double fpOld = 0.618033988749894848204586; //golden ratio!
-	long double fpNew = 1.0 - fpOld;	
 
 	double correctionL;
 	double correctionR;
@@ -211,25 +208,14 @@ void Aura::processReplacing(float **inputs, float **outputs, VstInt32 sampleFram
 			inputSampleR = (inputSampleR * wet) + (drySampleR * dry);
 		}		
 		
-		//noise shaping to 32-bit floating point
-		if (fpFlip) {
-			fpTemp = inputSampleL;
-			fpNShapeLA = (fpNShapeLA*fpOld)+((inputSampleL-fpTemp)*fpNew);
-			inputSampleL += fpNShapeLA;
-			fpTemp = inputSampleR;
-			fpNShapeRA = (fpNShapeRA*fpOld)+((inputSampleR-fpTemp)*fpNew);
-			inputSampleR += fpNShapeRA;
-		}
-		else {
-			fpTemp = inputSampleL;
-			fpNShapeLB = (fpNShapeLB*fpOld)+((inputSampleL-fpTemp)*fpNew);
-			inputSampleL += fpNShapeLB;
-			fpTemp = inputSampleR;
-			fpNShapeRB = (fpNShapeRB*fpOld)+((inputSampleR-fpTemp)*fpNew);
-			inputSampleR += fpNShapeRB;
-		}
-		fpFlip = !fpFlip;
-		//end noise shaping on 32 bit output
+		//stereo 32 bit dither, made small and tidy.
+		int expon; frexpf((float)inputSampleL, &expon);
+		long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
+		inputSampleL += (dither-fpNShapeL); fpNShapeL = dither;
+		frexpf((float)inputSampleR, &expon);
+		dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
+		inputSampleR += (dither-fpNShapeR); fpNShapeR = dither;
+		//end 32 bit dither
 		
 		*out1 = inputSampleL;
 		*out2 = inputSampleR;
@@ -248,9 +234,6 @@ void Aura::processDoubleReplacing(double **inputs, double **outputs, VstInt32 sa
     double* out1 = outputs[0];
     double* out2 = outputs[1];
 
-	double fpTemp;
-	long double fpOld = 0.618033988749894848204586; //golden ratio!
-	long double fpNew = 1.0 - fpOld;	
 	
 	double correctionL;
 	double correctionR;
@@ -445,25 +428,16 @@ void Aura::processDoubleReplacing(double **inputs, double **outputs, VstInt32 sa
 			inputSampleR = (inputSampleR * wet) + (drySampleR * dry);
 		}		
 		
-		//noise shaping to 64-bit floating point
-		if (fpFlip) {
-			fpTemp = inputSampleL;
-			fpNShapeLA = (fpNShapeLA*fpOld)+((inputSampleL-fpTemp)*fpNew);
-			inputSampleL += fpNShapeLA;
-			fpTemp = inputSampleR;
-			fpNShapeRA = (fpNShapeRA*fpOld)+((inputSampleR-fpTemp)*fpNew);
-			inputSampleR += fpNShapeRA;
-		}
-		else {
-			fpTemp = inputSampleL;
-			fpNShapeLB = (fpNShapeLB*fpOld)+((inputSampleL-fpTemp)*fpNew);
-			inputSampleL += fpNShapeLB;
-			fpTemp = inputSampleR;
-			fpNShapeRB = (fpNShapeRB*fpOld)+((inputSampleR-fpTemp)*fpNew);
-			inputSampleR += fpNShapeRB;
-		}
-		fpFlip = !fpFlip;
-		//end noise shaping on 64 bit output
+		//stereo 64 bit dither, made small and tidy.
+		int expon; frexp((double)inputSampleL, &expon);
+		long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
+		dither /= 536870912.0; //needs this to scale to 64 bit zone
+		inputSampleL += (dither-fpNShapeL); fpNShapeL = dither;
+		frexp((double)inputSampleR, &expon);
+		dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
+		dither /= 536870912.0; //needs this to scale to 64 bit zone
+		inputSampleR += (dither-fpNShapeR); fpNShapeR = dither;
+		//end 64 bit dither
 		
 		*out1 = inputSampleL;
 		*out2 = inputSampleR;