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src/rfw-ugens.cpp

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+/*
+ *  rfw-ugens.cpp
+ *  Plugins
+ *
+ *  Created by Rob Watson on 17/December/2008.
+ *  Copyright 2008 __MyCompanyName__. All rights reserved.
+ *
+ *  https://github.com/rfwatson
+ */
+/*
+	SuperCollider real time audio synthesis system
+ Copyright (c) 2002 James McCartney. All rights reserved.
+	http://www.audiosynth.com
+ 
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+ 
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+ 
+ You should have received a copy of the GNU General Public License
+ auint32 with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+
+#include "SC_PlugIn.h"
+
+static InterfaceTable *ft; 
+
+#define ENVLEN 2000.0 // TODO modulate
+
+struct SwitchDelay : public Unit  {
+    float *buffer;
+    float prev_samp, offset_start, offset_current;
+    uint32 writepos, readpos, decaytime, bufsize, offset_timer;
+    char crossfading;
+};
+
+struct AverageOutput : public Unit  {
+    float average, prev_trig;
+    uint32 count;
+};
+
+extern "C" {  	
+	void SwitchDelay_next(SwitchDelay *unit, int inNumSamples);
+	void SwitchDelay_Ctor(SwitchDelay* unit);
+	void SwitchDelay_Dtor(SwitchDelay* unit);
+	
+	void AverageOutput_next(AverageOutput *unit, int inNumSamples);
+	void AverageOutput_Ctor(AverageOutput* unit);
+}
+
+
+void SwitchDelay_Ctor( SwitchDelay* unit ) {
+	RGen& rgen = *unit->mParent->mRGen;
+
+    float *buffer;
+
+    unit->bufsize = (uint32)(SAMPLERATE * ZIN0(5));
+    buffer = unit->buffer = (float *)RTAlloc(unit->mWorld, unit->bufsize * sizeof(float));
+    
+    for(int i=0; i<unit->bufsize; ++i) 
+        *(buffer+i)=0.; // TODO use memset or something here
+            
+    unit->decaytime = (uint32)(ZIN0(3) * SAMPLERATE);
+    unit->writepos = 0;
+    unit->prev_samp = 0.;
+    unit->offset_start = 0.;
+    unit->offset_current = 0.;
+    unit->offset_timer = ENVLEN;
+    unit->crossfading = 0;
+    unit->readpos = ((unit->bufsize - unit->decaytime) + unit->bufsize) % unit->bufsize;
+        
+	SETCALC(SwitchDelay_next);
+}
+
+
+void SwitchDelay_Dtor(SwitchDelay *unit) {
+    RTFree(unit->mWorld, unit->buffer);
+}
+
+void SwitchDelay_next( SwitchDelay *unit, int inNumSamples ) {
+    int i;
+    float recval, readval, ratio;
+    
+    float *out = OUT(0);
+    float *in = IN(0);                            
+    float *buffer = unit->buffer;
+        
+    float drylevel = ZIN0(1);
+    float wetlevel = ZIN0(2);
+    float delayfactor = ZIN0(4);
+    float prev_samp = unit->prev_samp;
+    float offset_current = unit->offset_current;
+    float offset_start = unit->offset_start;
+
+    uint32 decaytime = (uint32)(ZIN0(3) * SAMPLERATE);    
+    uint32 bufsize = unit->bufsize;
+    uint32 offset_timer = unit->offset_timer;
+    uint32 writepos = unit->writepos;
+    uint32 readpos = ((writepos - decaytime) + (bufsize)) % bufsize;
+
+    char crossfading = unit->crossfading;
+
+    if(decaytime != unit->decaytime) { // move the read pointer
+        float newval, oldval, offset;
+        
+        newval = buffer[((readpos - decaytime) + bufsize) % bufsize];
+        oldval = buffer[readpos] + offset_current; // adding the current offset means that we can modulate again mid-crossfade.
+        offset = oldval - newval;
+        
+        crossfading = 1;
+        offset_start = offset;
+        offset_current = offset;
+        offset_timer = ENVLEN;
+    }
+    
+    // limit the delay multiplier to reasonable numbers
+    if(delayfactor < 0.) delayfactor = 0.;
+    if(delayfactor > 0.9) delayfactor = 0.9;
+    
+    for(i=0; i < inNumSamples; ++i) {
+        recval = in[i];
+        readval = buffer[readpos] + offset_current;
+        
+        recval = recval + (prev_samp * delayfactor);
+        out[i] = (in[i] * drylevel) + (readval * wetlevel);
+        
+        buffer[writepos] = recval;
+        prev_samp = readval;
+        
+        readpos = (readpos + 1) % bufsize;
+        writepos = (writepos + 1) % bufsize;
+        
+        if(crossfading) {
+            --offset_timer;        
+            
+            if(offset_timer > 0.) { // still crossfading
+                ratio = (offset_timer / ENVLEN);
+                offset_current = offset_start * ratio;
+            } else { // all done
+                crossfading = 0;
+                offset_current = 0.;        
+            }
+        }    
+    }
+    
+    unit->crossfading = crossfading;
+    unit->offset_start = offset_start;
+    unit->offset_current = offset_current;
+    unit->offset_timer = offset_timer;
+    unit->decaytime = decaytime;
+    unit->writepos = writepos;
+    unit->readpos = readpos;
+    unit->prev_samp = prev_samp;
+}	 
+
+
+void AverageOutput_Ctor( AverageOutput* unit ) {
+    unit->average = 0.;
+    unit->count = 0;
+    unit->prev_trig = 0.;
+	
+	RGen& rgen = *unit->mParent->mRGen;
+	
+	SETCALC(AverageOutput_next);
+}
+
+
+void AverageOutput_next( AverageOutput *unit, int inNumSamples ) {
+    int i;
+    float *in = IN(0);
+    float *out = ZOUT(0);
+    float trig = ZIN0(1);
+    float prev_trig = unit->prev_trig;
+    double average = unit->average;
+    uint32 count = unit->count;
+    
+    if(prev_trig <= 0. && trig > 0.) {
+        average = 0.;
+        count = 0;
+    }
+    		
+	for (i=0; i<inNumSamples; ++i) {
+        average = ((count * average) + *(in+i)) / ++count;
+        ZXP(out) = average;
+	}
+    
+    unit->prev_trig = trig;
+	  unit->count = count;
+    unit->average = average;
+}	
+
+
+extern "C" void load(InterfaceTable *inTable) {
+	ft = inTable;	
+	DefineDtorUnit(SwitchDelay);
+	DefineSimpleUnit(AverageOutput);
+}
+
+