SampleAndHold.cxx

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/*
 * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
 *                         UNIVERSITAT POMPEU FABRA
 *
 *
 * 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 "SampleAndHold.hxx"
#include "ProcessingFactory.hxx"

namespace CLAM
{
namespace Hidden
{
        static const char * metadata[] = {
                "key", "SampleAndHold",
                "category", "Spectral Transformations",
                "description", "SampleAndHold",
                0
        };
        static FactoryRegistrator<ProcessingFactory, SampleAndHold> reg = metadata;
}

bool SampleAndHold::Do(const Spectrum& in, Spectrum& out)
{
        if ( !mConfig.GetPreserveOuts() )
        {
                out = in; //TODO big cludge for streaming
        }
        
        //first convert from ms to token size
        //mFrameSize should  be set somehow in the configuration! It is the difference between one frame center and the next
        mFrameSize = 1024;
        
        if(mTimeElapsed == 0 ||mAmount.GetLastValue()<1. ) mSpectrum = in;
        
        if (mTimeElapsed>mAmount.GetLastValue()) {
                        mTimeElapsed = 0;
                }
        else {
                 mTimeElapsed += mFrameSize / in.GetSpectralRange() / 0.002;
        }
        
        out = mSpectrum;

        return true;
}



}