/**
 * 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.docs.tutorial.fund.audio;

import java.net.MalformedURLException;
import java.net.URL;

import org.openimaj.audio.analysis.FourierTransform;
import org.openimaj.audio.filters.EQFilter;
import org.openimaj.audio.filters.EQFilter.EQType;
import org.openimaj.video.xuggle.XuggleAudio;
import org.openimaj.vis.general.BarVisualisation;

/**
 * Example that demonstrates chaining of audio processors as well as visualising
 * the output of an FFT operation.
 *
 * @author David Dupplaw (dpd@ecs.soton.ac.uk)
 * @created 18 Jun 2013
 * @version $Author$, $Revision$, $Date$
 */
public class FFTEQ
{
        /**
         * Main method
         *
         * @param args Command-line args (unused)
         * @throws MalformedURLException
         */
        public static void main( final String[] args ) throws MalformedURLException
        {
                // Open a URL to the sine wave sweep. If you have downloaded
                // this file you should use a new File(<filename>) here.
                final XuggleAudio xa = new XuggleAudio(
                        new URL( "http://www.audiocheck.net/download.php?" +
                                        "filename=Audio/audiocheck.net_sweep20-20klin.wav" ) );

                // Create an EQ processor to pre-process the audio before doing the FFT
                // It will be a low-pass filter with a cut-off at 5KHz
                final EQFilter eq = new EQFilter( xa, EQType.LPF, 5000 );

                // Create the Fourier transform processor chained to the audio decoder
                final FourierTransform fft = new FourierTransform( eq );

                // Create a visualisation to show our FFT and open the window now
                // To avoid the visualisation scaling up the values once the peak
                // fades out, we need to disable auto scaling.
                final BarVisualisation bv = new BarVisualisation( 400, 200 );
                bv.setMaxValue( 1E12 );
                bv.setAutoScale( false );
                bv.showWindow( "FFTs" );

                // Loop through the sample chunks from the audio capture thread
                // sending each one through the feature extractor and displaying
                // the results in the visualisation.
                while( fft.nextSampleChunk() != null )
                {
                        final float[][] ffts = fft.getMagnitudes();
                        bv.setData( ffts[0] );
                }
        }
}