/*
 *  Copyright 2006 Columbia University.
 *
 *  This file is part of MEAPsoft.
 *
 *  MEAPsoft is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  MEAPsoft 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 MEAPsoft; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 *  02110-1301 USA
 *
 *  See the file "COPYING" for the text of the license.
 */

package com.meapsoft.featextractors;

import com.meapsoft.STFT;
import com.meapsoft.FeatFile;

/**
 * Extension of FeatureExtractor that takes a FeatFile instead of FFT
 * data. This allows meta features to be extracted from whole groups
 * of already extracted features.
 *
 * @author Mike Mandel (mim@ee.columbia.edu)/Douglas Repetto
 */

public abstract class MetaFeatureExtractor extends FeatureExtractor
{
	//not used in a meta feature extractor
	public double[] features(STFT stft, long startFrame, int length) 
	{        
		return null;
	}
	
    /**
     * Extract meta features from featFile.  Clears the original
     * features.
     */
	public void features(FeatFile featFile)
    {
        features(featFile, true);
    }

	public abstract void features(FeatFile featFile, boolean clearOriginalFeatures);
}