Add preliminary (library side only) LV2 port of MDA (open-sourced VST plugins).

git-svn-id: http://svn.drobilla.net/lad/mda-lv2@1321 a436a847-0d15-0410-975c-d299462d15a1

1 files changed, 180 insertions, 0 deletions

diff --git a/src/mdaOverdrive.cpp b/src/mdaOverdrive.cpp
new file mode 100644
index 0000000..ee72611
--- /dev/null
+++ b/src/mdaOverdrive.cpp
@@ -0,0 +1,180 @@
+#include "mdaOverdrive.h"
+  
+#include <math.h>

+

+
+AudioEffect *createEffectInstance(audioMasterCallback audioMaster)
+{
+  return new mdaOverdrive(audioMaster);
+}
+
+mdaOverdrive::mdaOverdrive(audioMasterCallback audioMaster)	: AudioEffectX(audioMaster, 1, 3)	// 1 program, 3 parameters
+{
+  fParam1 = 0.0f; 		
+  fParam2 = 0.0f;
+  fParam3 = 0.5f;
+
+  setNumInputs(2);		    
+	setNumOutputs(2);		    
+	setUniqueID("mdaO");    // identify
+	DECLARE_LVZ_DEPRECATED(canMono) ();				      
+	canProcessReplacing();	
+	strcpy(programName, "Soft Overdrive");	
+
+  filt1 = filt2 = 0.0f;
+  setParameter(0, 0.0f);

+}
+
+mdaOverdrive::~mdaOverdrive()
+{
+

+}
+
+bool  mdaOverdrive::getProductString(char* text) { strcpy(text, "mda Overdrive"); return true; }
+bool  mdaOverdrive::getVendorString(char* text)  { strcpy(text, "mda"); return true; }
+bool  mdaOverdrive::getEffectName(char* name)    { strcpy(name, "Overdrive"); return true; }
+
+void mdaOverdrive::setProgramName(char *name)
+{
+	strcpy(programName, name);
+}
+
+void mdaOverdrive::getProgramName(char *name)
+{
+	strcpy(name, programName);
+}
+
+void mdaOverdrive::setParameter(LvzInt32 index, float value)
+{
+	switch(index)
+  {
+    case 0: fParam1 = value; break;
+    case 1: fParam2 = value; break;
+    case 2: fParam3 = value; break;
+  }
+  filt = (float)pow(10.0,-1.6 * fParam2);
+  gain = (float)pow(10.0f, 2.0f * fParam3 - 1.0f);
+}
+
+float mdaOverdrive::getParameter(LvzInt32 index)
+{
+	float v=0;
+
+  switch(index)
+  {
+    case 0: v = fParam1; break;
+    case 1: v = fParam2; break;
+    case 2: v = fParam3; break;
+  }
+  return v;
+}
+
+void mdaOverdrive::getParameterName(LvzInt32 index, char *label)
+{
+	switch(index)
+  {
+    case 0: strcpy(label, "Drive   "); break;
+    case 1: strcpy(label, "Muffle  "); break;
+    case 2: strcpy(label, "Output  "); break;
+  }
+}
+
+#include <stdio.h>
+void long2string(long value, char *string) { sprintf(string, "%ld", value); }
+
+void mdaOverdrive::getParameterDisplay(LvzInt32 index, char *text)
+{
+	switch(index)
+  {
+    case 0: long2string((long)(100 * fParam1     ), text); break;
+    case 1: long2string((long)(100 * fParam2     ), text); break;
+    case 2: long2string((long)( 40 * fParam3 - 20), text); break;
+  }
+	
+}
+
+void mdaOverdrive::getParameterLabel(LvzInt32 index, char *label)
+{
+	switch(index)
+  {
+    case 0: strcpy(label, "%"); break;
+    case 1: strcpy(label, "%"); break;
+    case 2: strcpy(label, "dB"); break; 
+  }
+}
+
+//--------------------------------------------------------------------------------
+// process
+
+void mdaOverdrive::process(float **inputs, float **outputs, LvzInt32 sampleFrames)
+{
+	float *in1 = inputs[0];
+	float *in2 = inputs[1];
+	float *out1 = outputs[0];
+	float *out2 = outputs[1];
+	float a, b, c, d;
+  float i=fParam1, g=gain, aa, bb;
+  float f=filt, fa=filt1, fb=filt2;
+
+  --in1;	
+	--in2;
+	--out1;
+	--out2;
+	while(--sampleFrames >= 0)
+	{
+		a = *++in1;
+		b = *++in2;
+		
+    c = out1[1];
+		d = out2[1];
+
+    aa = (a>0.0f)? (float)sqrt(a) : (float)-sqrt(-a); //overdrive
+    bb = (b>0.0f)? (float)sqrt(b) : (float)-sqrt(-b); 
+
+    fa = fa + f * (i*(aa-a) + a - fa);                //filter 
+    fb = fb + f * (i*(bb-b) + b - fb);   
+
+    c += fa * g; 
+		d += fb * g;
+		    
+    *++out1 = c;
+		*++out2 = d;
+	}
+  if(fabs(fa)>1.0e-10) filt1 = fa; else filt1 = 0.0f; //catch denormals
+  if(fabs(fb)>1.0e-10) filt2 = fb; else filt2 = 0.0f;
+}
+
+void mdaOverdrive::processReplacing(float **inputs, float **outputs, LvzInt32 sampleFrames)
+{
+	float *in1 = inputs[0];
+	float *in2 = inputs[1];
+	float *out1 = outputs[0];
+	float *out2 = outputs[1];
+	float a, b, c, d;
+  float i=fParam1, g=gain, aa, bb;
+  float f=filt, fa=filt1, fb=filt2;
+  
+	--in1;	
+	--in2;
+	--out1;
+	--out2;
+	while(--sampleFrames >= 0)
+	{
+		a = *++in1;		
+		b = *++in2;
+		
+    aa = (a>0.0f)? (float)sqrt(a) : (float)-sqrt(-a); //overdrive
+    bb = (b>0.0f)? (float)sqrt(b) : (float)-sqrt(-b); 
+
+    fa = fa + f * (i*(aa-a) + a - fa);                //filter 
+    fb = fb + f * (i*(bb-b) + b - fb);   
+
+    c = fa * g; 
+		d = fb * g;
+
+    *++out1 = c;	
+		*++out2 = d;
+	}
+  if(fabs(fa)>1.0e-10) filt1 = fa; else filt1 = 0.0f; //catch denormals
+  if(fabs(fb)>1.0e-10) filt2 = fb; else filt2 = 0.0f;
+}