/home/marsyas/marsyas/src/marsyas/SpectralFlatnessAllBands.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 "SpectralFlatnessAllBands.h"

using std::ostringstream;
using namespace Marsyas;

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

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


SpectralFlatnessAllBands::~SpectralFlatnessAllBands()
{
}

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

void
SpectralFlatnessAllBands::addControls()
{
}

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

    MarSystem::myUpdate(sender);

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

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

}

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

    // swap Observations_ and Samples_ because it's intended
    // for spectral!

    for (t = 0; t < inSamples_; t++)
    {
        // we use log scale to calculate the geometric
        // mean, to avoid going lower than E-308, which is
        // the lower limit for doubles in C++.
        mrs_real geometric_mean = 0.0; // in log scale
        mrs_real arithmetic_mean = 0.0;
        for (o = 0; o < inObservations_; o++)
        {
            geometric_mean += log( in(o,t) ); // in log scale
            arithmetic_mean += in(o,t);
        }
        if (inObservations_ > 0) {
            geometric_mean /= inObservations_; // in log scale
            arithmetic_mean /= inObservations_;
        }
        geometric_mean = exp( geometric_mean ); // no more log scale
        if (arithmetic_mean > 0) {
            out(0, t) = geometric_mean / arithmetic_mean;
        } else {
            out(0, t) = 0.0;
        }
    }

}

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