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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
commite2de64d6f1beb9e492daf5b886e19933c1fa41dd (patch)
tree9047cf9e6b5c43878d5bf82660adae77ceee097a /arts/modules/synth/synth_fm_source_impl.cc
downloadtdemultimedia-e2de64d6f1beb9e492daf5b886e19933c1fa41dd.tar.gz
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Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
BUG:215923 git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdemultimedia@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
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+ /*
+
+ Copyright (C) 2000 Jeff Tranter
+ tranter@pobox.com
+
+ 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 "artsmodulessynth.h"
+#include "stdsynthmodule.h"
+
+using namespace Arts;
+
+// This is used for frequency modulation. Put your frequency to the
+// frequency input and put another signal on the modulator input. Then
+// set modlevel to something, say 0.3. The frequency will be modulated
+// with modulator then. Just try it. Works nice when you put a
+// feedback in there, that means take a combination of the delayed
+// output signal from the Synth_FM_SOURCE (you need to put it to some
+// oscillator as it only takes the role of Synth_FREQUENCY) and some
+// other signal to get good results. Works nicely in combination with
+// Synth_WAVE_SIN oscillators.
+
+class Synth_FM_SOURCE_impl : virtual public Synth_FM_SOURCE_skel,
+ virtual public StdSynthModule
+{
+protected:
+ static const int SAMPLINGRATE = 44100;
+ float posn;
+
+public:
+ void streamInit() { posn = 0; }
+
+ void calculateBlock(unsigned long samples)
+ {
+ for (unsigned long i=0; i<samples; i++)
+ {
+ float pinc = frequency[i] / (float) SAMPLINGRATE;
+ posn += pinc;
+ if (posn > 1)
+ posn -= 1;
+ pos[i] = posn + modulator[i] * modlevel[i];
+ }
+ }
+};
+
+REGISTER_IMPLEMENTATION(Synth_FM_SOURCE_impl);