1 files changed, 96 insertions, 0 deletions
diff --git a/arts/modules/synth/synth_fx_cflanger_impl.cpp b/arts/modules/synth/synth_fx_cflanger_impl.cpp
new file mode 100644
index 00000000..3f67fd7a
--- /dev/null
+++ b/arts/modules/synth/synth_fx_cflanger_impl.cpp
@@ -0,0 +1,96 @@
+/*
+
+    Copyright (C) 2000 Jeff Tranter
+                       tranter@pobox.com
+                       Stefan Westerfeld
+                       stefan@space.twc.de
+    
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+  
+    This library 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
+    Library General Public License for more details.
+   
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+
+    */
+
+#include <math.h>
+#include "artsmodulessynth.h"
+#include "stdsynthmodule.h"
+
+using namespace Arts;
+
+class Synth_FX_CFLANGER_impl : virtual public Synth_FX_CFLANGER_skel,
+							virtual public StdSynthModule
+{
+protected:
+	float _mintime;
+	float _maxtime;
+	enum { SAMPLINGRATE = 44100, MAXDELAY = 44100 };
+	float *dbuffer;
+	unsigned long dbpos;
+	float center;
+	float range;
+ 
+public:
+	Synth_FX_CFLANGER_impl()
+	{
+		dbuffer=new float[MAXDELAY];
+	}
+	~Synth_FX_CFLANGER_impl()
+	{
+		delete [] dbuffer;
+	}
+
+	float mintime() { return _mintime; }
+
+	void mintime(float newMintime) { _mintime = newMintime; }
+
+	float maxtime() { return _maxtime; }
+
+	void maxtime(float newMaxtime) { _maxtime = newMaxtime; }
+
+	void streamInit()
+	{
+		center = (_maxtime + _mintime) / 2;
+		range = _maxtime - center;
+		for (int i=0; i<MAXDELAY; i++)
+			dbuffer[i] = 0;
+		dbpos = 0;
+	}
+
+	void calculateBlock(unsigned long samples)
+	{
+		unsigned long i;
+		float delay, floor_delay;
+		long start_pos, end_pos;
+		float start_val, end_val;
+ 
+		for(i=0; i<samples; i++)
+		{
+			dbuffer[dbpos] = invalue[i];
+			// Delaytime i.e. = 35ms + (+/- LFO[-1 bis 1] * 15ms) / 1000 * 44100
+			delay = ((center + (lfo[i] * range)) / 1000.0) * (float) SAMPLINGRATE;
+			floor_delay = floor(delay);
+			start_pos = dbpos - (long)(floor_delay);
+			end_pos = start_pos-1;
+			if (start_pos < 0) start_pos += MAXDELAY; // wrapping exception
+			if (end_pos < 0) end_pos += MAXDELAY;
+			start_val = dbuffer[start_pos];
+			end_val = dbuffer[end_pos];
+			outvalue[i] = start_val + ((delay - floor_delay) * (end_val - start_val));
+			dbpos++;
+			if (dbpos == MAXDELAY) dbpos = 0;
+		}
+	}
+};
+
+REGISTER_IMPLEMENTATION(Synth_FX_CFLANGER_impl);