/home/marsyas/marsyas/src/marsyas/PowerToAverageRatio.cpp

/*
** Copyright (C) 1998-2010 George Tzanetakis <gtzan@cs.uvic.ca>
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#include "common.h" 
#include "PowerToAverageRatio.h"

using std::ostringstream;
using namespace Marsyas;

PowerToAverageRatio::PowerToAverageRatio(mrs_string name) : MarSystem("PowerToAverageRatio", name)
{
    addControls();
}

PowerToAverageRatio::PowerToAverageRatio(const PowerToAverageRatio& a) : MarSystem(a)
{
}


PowerToAverageRatio::~PowerToAverageRatio()
{
}

MarSystem*
PowerToAverageRatio::clone() const
{
    return new PowerToAverageRatio(*this);
}

void
PowerToAverageRatio::addControls()
{

}

void
PowerToAverageRatio::myUpdate(MarControlPtr sender)
{
    MRSDIAG("PowerToAverageRatio.cpp - PowerToAverageRatio:myUpdate");

    MarSystem::myUpdate(sender);

    // overwrite default settings as needed
    ctrl_onSamples_->setValue((mrs_natural)1, NOUPDATE);

    // Add prefix to the observation names.
    mrs_string inObsNames = ctrl_inObsNames_->to<mrs_string>();
    ctrl_onObsNames_->setValue(obsNamesAddPrefix(inObsNames, "PowerToAverageRatio_"), NOUPDATE);
}

void
PowerToAverageRatio::myProcess(realvec& in, realvec& out)
{
    mrs_natural t,o;

    for (o = 0; o < inObservations_; o++)
    {
        mrs_real samp_max = 0.0;
        mrs_real rms = 0.0;
        for (t = 0; t < inSamples_; t++)
        {
            mrs_real samp_abs = fabs(in(o,t));
            if (samp_max < samp_abs)
                samp_max = samp_abs;
            rms += samp_abs*samp_abs;
        }
        if (inSamples_ > 0)
            rms = sqrt( rms/inSamples_ );

        if (rms != 0)
            out(o,0) = samp_max / rms;
        else
            out(o,0) = 0.0;
    }
}

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