Floating Point Dither For All

3 files changed, 375 insertions, 0 deletions

diff --git a/plugins/MacVST/DitherFloat/source/DitherFloat.cpp b/plugins/MacVST/DitherFloat/source/DitherFloat.cpp
new file mode 100755
index 0000000..ffd9e94
--- /dev/null
+++ b/plugins/MacVST/DitherFloat/source/DitherFloat.cpp
@@ -0,0 +1,127 @@
+/* ========================================
+ *  DitherFloat - DitherFloat.h
+ *  Copyright (c) 2016 airwindows, All rights reserved
+ * ======================================== */
+
+#ifndef __DitherFloat_H
+#include "DitherFloat.h"
+#endif
+
+AudioEffect* createEffectInstance(audioMasterCallback audioMaster) {return new DitherFloat(audioMaster);}
+
+DitherFloat::DitherFloat(audioMasterCallback audioMaster) :
+    AudioEffectX(audioMaster, kNumPrograms, kNumParameters)
+{
+	A = 0.0;
+	B = 1.0;
+	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.
+    _canDo.insert("plugAsSend"); // plug-in can be used as a send effect.
+    _canDo.insert("x2in2out"); 
+    setNumInputs(kNumInputs);
+    setNumOutputs(kNumOutputs);
+    setUniqueID(kUniqueId);
+    canProcessReplacing();     // supports output replacing
+    canDoubleReplacing();      // supports double precision processing
+	programsAreChunks(true);
+    vst_strncpy (_programName, "Default", kVstMaxProgNameLen); // default program name
+}
+
+DitherFloat::~DitherFloat() {}
+VstInt32 DitherFloat::getVendorVersion () {return 1000;}
+void DitherFloat::setProgramName(char *name) {vst_strncpy (_programName, name, kVstMaxProgNameLen);}
+void DitherFloat::getProgramName(char *name) {vst_strncpy (name, _programName, kVstMaxProgNameLen);}
+//airwindows likes to ignore this stuff. Make your own programs, and make a different plugin rather than
+//trying to do versioning and preventing people from using older versions. Maybe they like the old one!
+
+static float pinParameter(float data)
+{
+	if (data < 0.0f) return 0.0f;
+	if (data > 1.0f) return 1.0f;
+	return data;
+}
+
+VstInt32 DitherFloat::getChunk (void** data, bool isPreset)
+{
+	float *chunkData = (float *)calloc(kNumParameters, sizeof(float));
+	chunkData[0] = A;
+	chunkData[1] = B;
+	/* Note: The way this is set up, it will break if you manage to save settings on an Intel
+	 machine and load them on a PPC Mac. However, it's fine if you stick to the machine you 
+	 started with. */
+	
+	*data = chunkData;
+	return kNumParameters * sizeof(float);
+}
+
+VstInt32 DitherFloat::setChunk (void* data, VstInt32 byteSize, bool isPreset)
+{	
+	float *chunkData = (float *)data;
+	A = pinParameter(chunkData[0]);
+	B = pinParameter(chunkData[1]);
+	/* We're ignoring byteSize as we found it to be a filthy liar */
+	
+	/* calculate any other fields you need here - you could copy in 
+	 code from setParameter() here. */
+	return 0;
+}
+
+void DitherFloat::setParameter(VstInt32 index, float value) {
+    switch (index) {
+        case kParamA: A = value; break;
+        case kParamB: B = value; break;
+        default: throw; // unknown parameter, shouldn't happen!
+    }
+}
+
+float DitherFloat::getParameter(VstInt32 index) {
+    switch (index) {
+        case kParamA: return A; break;
+        case kParamB: return B; break;
+        default: break; // unknown parameter, shouldn't happen!
+    } return 0.0; //we only need to update the relevant name, this is simple to manage
+}
+
+void DitherFloat::getParameterName(VstInt32 index, char *text) {
+    switch (index) {
+        case kParamA: vst_strncpy (text, "Offset", kVstMaxParamStrLen); break;
+		case kParamB: vst_strncpy (text, "Dither", kVstMaxParamStrLen); break;
+        default: break; // unknown parameter, shouldn't happen!
+    } //this is our labels for displaying in the VST host
+}
+
+void DitherFloat::getParameterDisplay(VstInt32 index, char *text) {
+    switch (index) {
+        case kParamA: int2string ((VstInt32)(A * 32), text, kVstMaxParamStrLen); break;
+        case kParamB: float2string (B, text, kVstMaxParamStrLen); break;
+        default: break; // unknown parameter, shouldn't happen!
+	} //this displays the values and handles 'popups' where it's discrete choices
+}
+
+void DitherFloat::getParameterLabel(VstInt32 index, char *text) {
+    switch (index) {
+        case kParamA: vst_strncpy (text, "", kVstMaxParamStrLen); break;
+        case kParamB: vst_strncpy (text, "", kVstMaxParamStrLen); break;
+		default: break; // unknown parameter, shouldn't happen!
+    }
+}
+
+VstInt32 DitherFloat::canDo(char *text) 
+{ return (_canDo.find(text) == _canDo.end()) ? -1: 1; } // 1 = yes, -1 = no, 0 = don't know
+
+bool DitherFloat::getEffectName(char* name) {
+    vst_strncpy(name, "DitherFloat", kVstMaxProductStrLen); return true;
+}
+
+VstPlugCategory DitherFloat::getPlugCategory() {return kPlugCategEffect;}
+
+bool DitherFloat::getProductString(char* text) {
+  	vst_strncpy (text, "airwindows DitherFloat", kVstMaxProductStrLen); return true;
+}
+
+bool DitherFloat::getVendorString(char* text) {
+  	vst_strncpy (text, "airwindows", kVstMaxVendorStrLen); return true;
+}
diff --git a/plugins/MacVST/DitherFloat/source/DitherFloat.h b/plugins/MacVST/DitherFloat/source/DitherFloat.h
new file mode 100755
index 0000000..b8ddf51
--- /dev/null
+++ b/plugins/MacVST/DitherFloat/source/DitherFloat.h
@@ -0,0 +1,64 @@
+/* ========================================
+ *  DitherFloat - DitherFloat.h
+ *  Created 8/12/11 by SPIAdmin 
+ *  Copyright (c) 2011 __MyCompanyName__, All rights reserved
+ * ======================================== */
+
+#ifndef __DitherFloat_H
+#define __DitherFloat_H
+
+#ifndef __audioeffect__
+#include "audioeffectx.h"
+#endif
+
+#include <set>
+#include <string>
+#include <math.h>
+
+enum {
+	kParamA = 0,
+	kParamB = 1,
+  kNumParameters = 2
+}; //
+
+const int kNumPrograms = 0;
+const int kNumInputs = 2;
+const int kNumOutputs = 2;
+const unsigned long kUniqueId = 'dthf';    //Change this to what the AU identity is!
+
+class DitherFloat : 
+    public AudioEffectX 
+{
+public:
+    DitherFloat(audioMasterCallback audioMaster);
+    ~DitherFloat();
+    virtual bool getEffectName(char* name);                       // The plug-in name
+    virtual VstPlugCategory getPlugCategory();                    // The general category for the plug-in
+    virtual bool getProductString(char* text);                    // This is a unique plug-in string provided by Steinberg
+    virtual bool getVendorString(char* text);                     // Vendor info
+    virtual VstInt32 getVendorVersion();                          // Version number
+    virtual void processReplacing (float** inputs, float** outputs, VstInt32 sampleFrames);
+    virtual void processDoubleReplacing (double** inputs, double** outputs, VstInt32 sampleFrames);
+    virtual void getProgramName(char *name);                      // read the name from the host
+    virtual void setProgramName(char *name);                      // changes the name of the preset displayed in the host
+	virtual VstInt32 getChunk (void** data, bool isPreset);
+	virtual VstInt32 setChunk (void* data, VstInt32 byteSize, bool isPreset);
+    virtual float getParameter(VstInt32 index);                   // get the parameter value at the specified index
+    virtual void setParameter(VstInt32 index, float value);       // set the parameter at index to value
+    virtual void getParameterLabel(VstInt32 index, char *text);  // label for the parameter (eg dB)
+    virtual void getParameterName(VstInt32 index, char *text);    // name of the parameter
+    virtual void getParameterDisplay(VstInt32 index, char *text); // text description of the current value    
+    virtual VstInt32 canDo(char *text);
+private:
+    char _programName[kVstMaxProgNameLen + 1];
+    std::set< std::string > _canDo;
+    
+	long double fpNShapeL;
+	long double fpNShapeR;
+	//default stuff
+
+    float A;
+    float B;
+};
+
+#endif
diff --git a/plugins/MacVST/DitherFloat/source/DitherFloatProc.cpp b/plugins/MacVST/DitherFloat/source/DitherFloatProc.cpp
new file mode 100755
index 0000000..3c76a1a
--- /dev/null
+++ b/plugins/MacVST/DitherFloat/source/DitherFloatProc.cpp
@@ -0,0 +1,184 @@
+/* ========================================
+ *  DitherFloat - DitherFloat.h
+ *  Copyright (c) 2016 airwindows, All rights reserved
+ * ======================================== */
+
+#ifndef __DitherFloat_H
+#include "DitherFloat.h"
+#endif
+
+void DitherFloat::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();
+
+	int floatOffset = (A * 32);
+	long double blend = B;
+	
+	long double gain = 0;
+	
+	switch (floatOffset)
+	{
+		case 0: gain = 1.0; break;
+		case 1: gain = 2.0; break;
+		case 2: gain = 4.0; break;
+		case 3: gain = 8.0; break;
+		case 4: gain = 16.0; break;
+		case 5: gain = 32.0; break;
+		case 6: gain = 64.0; break;
+		case 7: gain = 128.0; break;
+		case 8: gain = 256.0; break;
+		case 9: gain = 512.0; break;
+		case 10: gain = 1024.0; break;
+		case 11: gain = 2048.0; break;
+		case 12: gain = 4096.0; break;
+		case 13: gain = 8192.0; break;
+		case 14: gain = 16384.0; break;
+		case 15: gain = 32768.0; break;
+		case 16: gain = 65536.0; break;
+		case 17: gain = 131072.0; break;
+		case 18: gain = 262144.0; break;
+		case 19: gain = 524288.0; break;
+		case 20: gain = 1048576.0; break;
+		case 21: gain = 2097152.0; break;
+		case 22: gain = 4194304.0; break;
+		case 23: gain = 8388608.0; break;
+		case 24: gain = 16777216.0; break;
+		case 25: gain = 33554432.0; break;
+		case 26: gain = 67108864.0; break;
+		case 27: gain = 134217728.0; break;
+		case 28: gain = 268435456.0; break;
+		case 29: gain = 536870912.0; break;
+		case 30: gain = 1073741824.0; break;
+		case 31: gain = 2147483648.0; break;
+		case 32: gain = 4294967296.0; break;
+	}
+	//we are directly punching in the gain values rather than calculating them
+    
+    while (--sampleFrames >= 0)
+    {
+		long double inputSampleL = *in1 + (gain-1);
+		long double inputSampleR = *in2 + (gain-1);
+		
+		
+		
+		//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) * blend;	//remove 'blend' for real use, it's for the demo;
+		inputSampleL += (dither-fpNShapeL); fpNShapeL = dither;
+		frexpf((float)inputSampleR, &expon);
+		dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62) * blend;	//remove 'blend' for real use, it's for the demo;
+		inputSampleR += (dither-fpNShapeR); fpNShapeR = dither;
+		//end 32 bit dither
+		
+		
+		
+		inputSampleL = (float)inputSampleL; //equivalent of 'floor' for 32 bit floating point
+		inputSampleR = (float)inputSampleR; //equivalent of 'floor' for 32 bit floating point
+		//We do that separately, we're truncating to floating point WHILE heavily offset.
+
+		*out1 = inputSampleL - (gain-1);
+		*out2 = inputSampleR - (gain-1);
+
+		*in1++;
+		*in2++;
+		*out1++;
+		*out2++;
+    }
+}
+
+void DitherFloat::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();
+	
+	int floatOffset = (A * 32);
+	long double blend = B;
+	
+	long double gain = 0;
+	
+	switch (floatOffset)
+	{
+		case 0: gain = 1.0; break;
+		case 1: gain = 2.0; break;
+		case 2: gain = 4.0; break;
+		case 3: gain = 8.0; break;
+		case 4: gain = 16.0; break;
+		case 5: gain = 32.0; break;
+		case 6: gain = 64.0; break;
+		case 7: gain = 128.0; break;
+		case 8: gain = 256.0; break;
+		case 9: gain = 512.0; break;
+		case 10: gain = 1024.0; break;
+		case 11: gain = 2048.0; break;
+		case 12: gain = 4096.0; break;
+		case 13: gain = 8192.0; break;
+		case 14: gain = 16384.0; break;
+		case 15: gain = 32768.0; break;
+		case 16: gain = 65536.0; break;
+		case 17: gain = 131072.0; break;
+		case 18: gain = 262144.0; break;
+		case 19: gain = 524288.0; break;
+		case 20: gain = 1048576.0; break;
+		case 21: gain = 2097152.0; break;
+		case 22: gain = 4194304.0; break;
+		case 23: gain = 8388608.0; break;
+		case 24: gain = 16777216.0; break;
+		case 25: gain = 33554432.0; break;
+		case 26: gain = 67108864.0; break;
+		case 27: gain = 134217728.0; break;
+		case 28: gain = 268435456.0; break;
+		case 29: gain = 536870912.0; break;
+		case 30: gain = 1073741824.0; break;
+		case 31: gain = 2147483648.0; break;
+		case 32: gain = 4294967296.0; break;
+	}
+	//we are directly punching in the gain values rather than calculating them
+    	
+    while (--sampleFrames >= 0)
+    {
+		long double inputSampleL = *in1 + (gain-1);
+		long double inputSampleR = *in2 + (gain-1);
+		
+		
+		
+		//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) * blend;	//remove 'blend' for real use, it's for the demo;
+		inputSampleL += (dither-fpNShapeL); fpNShapeL = dither;
+		frexpf((float)inputSampleR, &expon);
+		dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62) * blend;	//remove 'blend' for real use, it's for the demo;
+		inputSampleR += (dither-fpNShapeR); fpNShapeR = dither;
+		//end 32 bit dither
+		
+		
+		
+		inputSampleL = (float)inputSampleL; //equivalent of 'floor' for 32 bit floating point
+		inputSampleR = (float)inputSampleR; //equivalent of 'floor' for 32 bit floating point
+		//We do that separately, we're truncating to floating point WHILE heavily offset.
+		
+		//note for 64 bit version: this is not for actually dithering 64 bit floats!
+		//This is specifically for demonstrating the sound of 32 bit floating point dither
+		//even over a 64 bit buss. Therefore it should be using float, above!
+		
+		*out1 = inputSampleL - (gain-1);
+		*out2 = inputSampleR - (gain-1);
+
+		*in1++;
+		*in2++;
+		*out1++;
+		*out2++;
+    }
+}