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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_envelope_adsr_impl.cc
downloadtdemultimedia-e2de64d6f1beb9e492daf5b886e19933c1fa41dd.tar.gz
tdemultimedia-e2de64d6f1beb9e492daf5b886e19933c1fa41dd.zip
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
Diffstat (limited to 'arts/modules/synth/synth_envelope_adsr_impl.cc')
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diff --git a/arts/modules/synth/synth_envelope_adsr_impl.cc b/arts/modules/synth/synth_envelope_adsr_impl.cc
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+ /*
+
+ Copyright (C) 2000 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 "artsmodulessynth.h"
+#include "debug.h"
+#include "stdsynthmodule.h"
+
+using namespace Arts;
+
+class Synth_ENVELOPE_ADSR_impl : virtual public Synth_ENVELOPE_ADSR_skel,
+ virtual public StdSynthModule
+{
+protected:
+ enum { NOOUT, ATTACK, SUSTAIN, DECAY, RELEASE } currentphase;
+ float level,increment,decrement;
+public:
+ void streamInit()
+ {
+ currentphase = NOOUT;
+ level = 0;
+ }
+ void calculateBlock(unsigned long samples);
+};
+
+void Synth_ENVELOPE_ADSR_impl::calculateBlock(unsigned long samples)
+{
+ /* FIXME:
+ * should be rewritten as generic envelope, would certainly
+ * be faster & more flexible
+ */
+ unsigned long i;
+
+ for(i=0;i<samples;i++)
+ {
+ done[i] = 0;
+ if(active[i] < 0.5)
+ {
+ if(currentphase == NOOUT)
+ {
+ level = 0;
+ done[i] = 1;
+ }
+ else
+ {
+ if(currentphase != RELEASE) {
+ artsdebug("ADSR: entering release phase\n");
+ currentphase = RELEASE;
+ decrement = level / (release[i] * samplingRateFloat);
+ }
+ level -= decrement;
+ if(level <= 0)
+ {
+ level = 0;
+ currentphase = NOOUT;
+ }
+ }
+ }
+ else
+ {
+ switch(currentphase)
+ {
+ //quickly kill the note that is still there (channel busy ;)
+ case RELEASE:
+ level -= 1/200;
+ if(level <= 0) {
+ currentphase = NOOUT;
+ level = 0;
+ }
+ break;
+ case NOOUT:
+ artsdebug("ADSR: entering attack\n");
+ increment = 1 / (attack[i] * samplingRateFloat);
+ currentphase = ATTACK;
+ break;
+ case ATTACK:
+ level += increment;
+ if (level >= 1)
+ {
+ level = 1;
+ currentphase = DECAY;
+ decrement = (1-sustain[i]) /
+ (decay[i] * samplingRateFloat);
+ }
+ break;
+ case DECAY:
+ level -= decrement;
+ if (level <= sustain[i])
+ {
+ level = sustain[i];
+ currentphase = SUSTAIN;
+ }
+ break;
+ case SUSTAIN:
+ level = sustain[i];
+ break;
+ }
+ }
+ outvalue[i] = invalue[i] * level;
+ }
+}
+
+REGISTER_IMPLEMENTATION(Synth_ENVELOPE_ADSR_impl);