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-rw-r--r--arts/modules/synth/synth_fx_cflanger_impl.cc96
1 files changed, 96 insertions, 0 deletions
diff --git a/arts/modules/synth/synth_fx_cflanger_impl.cc b/arts/modules/synth/synth_fx_cflanger_impl.cc
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+/*
+
+ 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., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, 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);