Marsyas  0.6.0-alpha
/usr/src/RPM/BUILD/marsyas-0.6.0/src/marsyas/marsystems/OverlapAdd.cpp
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00001 /*
00002 ** Copyright (C) 1998-2010 George Tzanetakis <gtzan@cs.uvic.ca>
00003 **
00004 ** This program is free software; you can redistribute it and/or modify
00005 ** it under the terms of the GNU General Public License as published by
00006 ** the Free Software Foundation; either version 2 of the License, or
00007 ** (at your option) any later version.
00008 **
00009 ** This program is distributed in the hope that it will be useful,
00010 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012 ** GNU General Public License for more details.
00013 **
00014 ** You should have received a copy of the GNU General Public License
00015 ** along with this program; if not, write to the Free Software
00016 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00017 */
00018 
00019 #include "OverlapAdd.h"
00020 #include <algorithm>
00021 
00022 using std::ostringstream;
00023 using std::max;
00024 
00025 using namespace Marsyas;
00026 
00027 OverlapAdd::OverlapAdd(mrs_string name):MarSystem("OverlapAdd",name)
00028 {
00029   this->addControls ();
00030 }
00031 
00032 OverlapAdd::~OverlapAdd()
00033 {
00034 }
00035 
00036 void
00037 OverlapAdd::addControls()
00038 {
00039   addctrl("mrs_natural/ratioBlock2Hop", 2);
00040 }
00041 
00042 MarSystem*
00043 OverlapAdd::clone() const
00044 {
00045   return new OverlapAdd(*this);
00046 }
00047 
00048 void
00049 OverlapAdd::myUpdate(MarControlPtr sender)
00050 {
00051   (void) sender;  //suppress warning of unused parameter(s)
00052   mrs_natural ratio = max((mrs_natural)1,getctrl("mrs_natural/ratioBlock2Hop")->to<mrs_natural>());
00053   setctrl("mrs_natural/onSamples", ctrl_inSamples_->to<mrs_natural>()/ratio);
00054   setctrl("mrs_natural/onObservations", ctrl_inObservations_->to<mrs_natural>());
00055   setctrl("mrs_real/osrate", getctrl("mrs_real/israte")->to<mrs_real>());
00056 
00057   back_.stretch(ctrl_onObservations_->to<mrs_natural>(), ctrl_inSamples_->to<mrs_natural>()-ctrl_onSamples_->to<mrs_natural>());
00058 }
00059 
00060 void
00061 OverlapAdd::myProcess(realvec& in, realvec& out)
00062 {
00063   mrs_natural t,o;
00064   for(o=0 ; o<onObservations_; o++)
00065   {
00066     // compute output
00067     for(t=0; t<onSamples_; t++)
00068       out(o, t) = back_(o, t)+in(o, t);
00069 
00070     // old code
00071     //for(t=0;t<onSamples_;t++)
00072     //  back_(o, t) = in(o, t+onSamples_);
00073 
00074     // shift internal buffer and add new samples
00075     for (t = onSamples_; t < inSamples_ - onSamples_; t++)
00076       back_(o,t-onSamples_) =  back_(o,t) + in(o,t);
00077 
00078     // copy the non-overlapping samples
00079     for (t = inSamples_-onSamples_; t < inSamples_; t++)
00080       back_(o,t-onSamples_) =  in(o,t);
00081   }
00082 }
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