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A project for various tests that don't quite constitute demos but might be useful to look at.

There is a newer version: 1.3.8

/**
 * Copyright (c) 2011, The University of Southampton and the individual contributors.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 *   * 	Redistributions of source code must retain the above copyright notice,
 * 	this list of conditions and the following disclaimer.
 *
 *   *	Redistributions in binary form must reproduce the above copyright notice,
 * 	this list of conditions and the following disclaimer in the documentation
 * 	and/or other materials provided with the distribution.
 *
 *   *	Neither the name of the University of Southampton nor the names of its
 * 	contributors may be used to endorse or promote products derived from this
 * 	software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/**
 * 
 */
package org.openimaj.demos.sandbox.audio;

import java.io.File;

import org.openimaj.audio.AudioStream;
import org.openimaj.audio.SampleChunk;
import org.openimaj.audio.analysis.PowerCepstrumTransform;
import org.openimaj.image.DisplayUtilities;
import org.openimaj.image.FImage;
import org.openimaj.video.xuggle.XuggleAudio;

/**
 *	
 *
 *	@author David Dupplaw ([email protected])
 *  @created 23 Jul 2012
 *	@version $Author$, $Revision$, $Date$
 */
public class PowerCepstrumVis
{
	/**
	 * 
	 *	@param as
	 *	@throws Exception
	 */
	public PowerCepstrumVis( AudioStream as ) throws Exception
    {
		FImage img = new FImage( 1000, 600 );

		PowerCepstrumTransform pct = new PowerCepstrumTransform();
		
		SampleChunk sc = null;
		while( (sc = as.nextSampleChunk()) != null )
		{
			pct.process( sc );
			float[][] c = pct.getLastCepstrum();
			for( int i = 0; i < c[0].length; i++ )
				img.setPixel( img.getWidth()-1, i, c[0][i]/50f );
			img.shiftLeftInplace();
			
			DisplayUtilities.displayName( img, "Power Cepstrum" );
		}
    }
	
	/**
	 * 
	 *	@param args
	 *	@throws Exception
	 */
	public static void main( String[] args ) throws Exception
    {
		XuggleAudio as = new XuggleAudio( new File("/home/dd/mel.mp4" ) );
	    new PowerCepstrumVis( as );
    }
}