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Code:



 

 /*

* AudioChannel.java

*

* This file is part of the Java Sound Examples.

*/



/*

* Copyright (c) 1999, 2000 by Matthias Pfisterer

*

*

* This program is free software; you can redistribute it and/or modify

* it under the terms of the GNU Library 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 Library General Public License for more details.

*

* You should have received a copy of the GNU Library General Public

* License along with this program; if not, write to the Free Software

* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*

*/



/*

|<--- this code is formatted to fit into 80 columns --->|

*/



import java.io.InputStream;

import java.io.IOException;

import java.net.URL;

import java.util.ArrayList;

import java.util.List;



import javax.sound.sampled.AudioFormat;

import javax.sound.sampled.AudioInputStream;

import javax.sound.sampled.AudioSystem;

import javax.sound.sampled.LineUnavailableException;

import javax.sound.sampled.LineListener;

import javax.sound.sampled.LineEvent;

import javax.sound.sampled.Mixer;

import javax.sound.sampled.SourceDataLine;

import javax.sound.sampled.DataLine;

import javax.sound.sampled.FloatControl;

import javax.sound.sampled.BooleanControl;



// IDEA: can this class be derived from AudioStream??



public class AudioChannel

        extends Thread {

    private static final boolean DEBUG = true;

    private static final int BUFFER_SIZE = 16384;



    private List m_audioStreamQueue;

    private SourceDataLine m_line;

    private byte[] m_dataArray;



/*

* Uses the passed Mixer.

*/



    public AudioChannel(SourceDataLine line) {

        super("AudioChannel");

/* Setting this thread to daemon means that this thread

doesn't prevent the VM from exiting even if it is

still running.

*/

        setDaemon(true);

// TODO: check if priority makes sense

        setPriority(9);

        m_line = line;

        m_audioStreamQueue = new ArrayList();

// TODO: make size configurable

        int nBufSizeInFrames = 0;

        if (m_line.getBufferSize() > 0) {

            nBufSizeInFrames = m_line.getBufferSize() / 2;

        } else {

            nBufSizeInFrames = 4096;

        }

        m_dataArray = new byte[nBufSizeInFrames];

    }





    public AudioFormat getFormat() {

        return m_line.getFormat();

    }





    public boolean addAudioInputStream(AudioInputStream audioStream) {

        if (DEBUG) {

            out("AudioChannel.addAudioInputStream(): called.");

        }

        if (!getFormat().matches(audioStream.getFormat())) {

            if (DEBUG) {

                out("AudioChannel.addAudioInputStream(): audio formats do not match, trying to convert.");

            }

            AudioInputStream asold = audioStream;

            audioStream = AudioSystem.getAudioInputStream(getFormat(), asold);

            if (audioStream == null) {

                out("### AudioChannel.addAudioInputStream(): could not convert.");

                return false;

            }

            if (DEBUG) {

                out(" converted");

            }

        }

        synchronized (m_audioStreamQueue) {

            m_audioStreamQueue.add(audioStream);

            m_audioStreamQueue.notifyAll();

        }

        if (DEBUG) {

            out("AudioChannel.addAudioInputStream(): enqueued " + audioStream);

        }

        return true;

    }



// TODO: termination of loop



    public void run() {

        if (DEBUG) {

            out("AudioChannel.run(): starting");

        }

        while (true) {

            AudioInputStream audioStream = null;

            synchronized (m_audioStreamQueue) {

                while (m_audioStreamQueue.size() == 0) {

                    try {

                        m_audioStreamQueue.wait();

                    }

                    catch (InterruptedException e) {

                        e.printStackTrace();

                    }

                }

                audioStream = (AudioInputStream) m_audioStreamQueue.remove(0);

            }

            if (DEBUG) {

                out("AudioChannel.run(): playing " + audioStream);

            }

            int nBytesRead;

            while (true) {

                try {

                    nBytesRead = audioStream.read(m_dataArray);

                    if (nBytesRead == -1) {

// m_line.write(null, 0, 0);

                        break;

                    }

                    int nBytesWritten = m_line.write(m_dataArray, 0, nBytesRead);

// Contract.check(nBytesWritten == nBytesRead);

                }

                catch (IOException e) {

                    e.printStackTrace();

                    break;

                }

            }

        }

    }





    public void closeChannel() {

// TODO:

    }





    public void startChannel() {

// TODO:

        m_line.start();

        super.start();

    }



// should not block, but trigger the termination



    public void stopChannel() {

// TODO: do some mystery to

// a) stop the line (without interupting current plays)

// b) stop the Thread

    }





    private static void out(String strMessage) {

        System.out.println(strMessage);

    }

}



/*** AudioChannel.java ***/