/*

  * Copyright (c) 2002-2014, Mairie de Paris

  * All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met:

  *

  *  1. Redistributions of source code must retain the above copyright notice

  *     and the following disclaimer.

  *

  *  2. Redistributions in binary form must reproduce the above copyright notice

  *     and the following disclaimer in the documentation and/or other materials

  *     provided with the distribution.

  *

  *  3. Neither the name of 'Mairie de Paris' nor 'Lutece' 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 HOLDERS 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.

  *

  * License 1.0

  */

 package fr.paris.lutece.plugins.captcha.modules.jcaptcha.service.sound;

 import fr.paris.lutece.portal.service.util.AppLogService;

 import java.io.ByteArrayOutputStream;

 import java.io.File;

 import java.io.IOException;

 import java.util.ArrayList;

 import java.util.List;

 import javax.sound.sampled.AudioFileFormat;

 import javax.sound.sampled.AudioFormat;

 import javax.sound.sampled.AudioInputStream;

 import javax.sound.sampled.AudioSystem;

 /**

  *

  */

 public final class AudioConcat

 {

     /**

      *

      *

      */

     private AudioConcat(  )

     {

     }

     /**

      * Return byte array of concatened audio files

      *

      * @param files

      *            to cancatenate

      * @return byte array of concatened audio files

      */

     public static ByteArrayOutputStream concat( File... files )

     {

         List<AudioInputStream> audioInputStreamList = new ArrayList<AudioInputStream>(  );

         AudioInputStream audioInputStream = null;

         AudioFormat audioFormat = null;

         for ( File soundFile : files )

         {

             try

             {

                 audioInputStream = AudioSystem.getAudioInputStream( soundFile );

             }

             catch ( Exception e )

             {

                 AppLogService.error( e.getMessage(  ), e );

             }

             audioInputStreamList.add( audioInputStream );

             AudioFormat format = audioInputStream.getFormat(  );

             if ( audioFormat == null )

             {

                 audioFormat = format;

             }

         }

         return concat( audioInputStreamList, audioFormat );

     }

     /**

      * Return byte array of concatened stream list.

      *

      * @param audioInputStreamList

      *            the list to contatenate

      * @param audioFormat

      *            the result format

      * @return byte array of concatened stream list.

      */

     public static ByteArrayOutputStream concat( List<AudioInputStream> audioInputStreamList, AudioFormat audioFormat )

     {

         AudioInputStream audioInputStream = new SequenceAudioInputStream( audioFormat, audioInputStreamList );

         ByteArrayOutputStream outputStream = new ByteArrayOutputStream(  );

         try

         {

             AudioSystem.write( audioInputStream, AudioFileFormat.Type.WAVE, outputStream );

             outputStream.flush(  );

             outputStream.close(  );

         }

         catch ( IOException e )

         {

             AppLogService.error( e.getMessage(  ), e );

         }

         return outputStream;

     }

 }