javasound.java

用JAVA实现录音机功能

/*
 * @(#)JavaSound.java	1.15	00/01/31
 *
 * Copyright (c) 1999 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
 * modify and redistribute this software in source and binary code form,
 * provided that i) this copyright notice and license appear on all copies of
 * the software; and ii) Licensee does not utilize the software in a manner
 * which is disparaging to Sun.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
 * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
 * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
 * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * This software is not designed or intended for use in on-line control of
 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
 * the design, construction, operation or maintenance of any nuclear
 * facility. Licensee represents and warrants that it will not use or
 * redistribute the Software for such purposes.
 */


import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import java.io.File;
import java.util.Vector;
import javax.sound.sampled.*;
import javax.sound.midi.*;


/**
 * The Java Sound Samples : MidiSynth, Juke, CapturePlayback, Groove.
 *
 * @version @(#)JavaSound.java	1.15 00/01/31
 * @author Brian Lichtenwalter  
 */
public class JavaSound extends JPanel implements ChangeListener, Runnable {

    Vector demos = new Vector(4);
    JTabbedPane tabPane = new JTabbedPane();
    int width = 760, height = 500;
    int index;


    public JavaSound(String audioDirectory) {

        setLayout(new BorderLayout());

        JMenuBar menuBar = new JMenuBar();
       
        if (JavaSoundApplet.applet == null) {
            JMenu fileMenu = (JMenu) menuBar.add(new JMenu("File"));
            JMenuItem item = (JMenuItem) fileMenu.add(new JMenuItem("Exit"));
            item.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) { System.exit(0); }
            });
        }
        JMenu options = (JMenu) menuBar.add(new JMenu("Options"));
        JMenuItem item = (JMenuItem) options.add(new JMenuItem("Applet Info"));
        item.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) { showInfoDialog(); }
        });
        add(menuBar, BorderLayout.NORTH);

        tabPane.addChangeListener(this);

        EmptyBorder eb = new EmptyBorder(5,5,5,5);
        BevelBorder bb = new BevelBorder(BevelBorder.LOWERED);
        CompoundBorder cb = new CompoundBorder(eb,bb);
        JPanel p = new JPanel(new BorderLayout());
        p.setBorder(new CompoundBorder(cb,new EmptyBorder(0,0,90,0)));
        final Juke juke = new Juke(audioDirectory);
        p.add(juke);
        demos.add(juke);
        tabPane.addTab("Juke Box", p);

        new Thread(this).start();

        add(tabPane, BorderLayout.CENTER);
    }


    public void stateChanged(ChangeEvent e) {
        close();
        System.gc();
        index = tabPane.getSelectedIndex();
        open();
    }


    public void close() {
        ((ControlContext) demos.get(index)).close();
    }


    public void open() {
        ((ControlContext) demos.get(index)).open();
    }


    public Dimension getPreferredSize() {
        return new Dimension(width, height);
    }


    public static void showInfoDialog() {
        final String msg = 
            "When running the Java Sound demo as an applet these permissions\n" +
            "are necessary in order to load/save files and record audio :  \n\n"+
            "grant { \n" +
            "  permission java.io.FilePermission \"<<ALL FILES>>\", \"read, write\";\n" +
            "  permission javax.sound.sampled.AudioPermission \"record\"; \n" +
            "  permission java.util.PropertyPermission \"user.dir\", \"read\";\n"+
            "}; \n\n" +
            "The permissions need to be added to the .java.policy file.";
        new Thread(new Runnable() {
            public void run() {
                JOptionPane.showMessageDialog(null, msg, "Applet Info", JOptionPane.INFORMATION_MESSAGE);
            }
        }).start();
    }



    /**
     * Lazy load the tabbed pane with CapturePlayback, MidiSynth and Groove.
     */
    public void run() {
        EmptyBorder eb = new EmptyBorder(5,5,5,5);
        BevelBorder bb = new BevelBorder(BevelBorder.LOWERED);
        CompoundBorder cb = new CompoundBorder(eb,bb);
        JPanel p = new JPanel(new BorderLayout());
        p.setBorder(new CompoundBorder(cb,new EmptyBorder(0,0,90,0)));
        CapturePlayback capturePlayback = new CapturePlayback();
        demos.add(capturePlayback);
        p.add(capturePlayback);
        tabPane.addTab("Capture/Playback", p);

        MidiSynth midiSynth = new MidiSynth();
        demos.add(midiSynth);
        tabPane.addTab("Midi Synthesizer", midiSynth);

        p = new JPanel(new BorderLayout());
        p.setBorder(new CompoundBorder(cb,new EmptyBorder(0,0,5,20)));
        Groove groove = new Groove();
        demos.add(groove);
        p.add(groove);
        tabPane.addTab("Groove Box", p);
    }


    public static void main(String[] args) {

        try { 
            if (MidiSystem.getSequencer() == null) {
                System.err.println("MidiSystem Sequencer Unavailable, exiting!");
                System.exit(1);
            } else if (AudioSystem.getMixer(null) == null) {
                System.err.println("AudioSystem Unavailable, exiting!");
                System.exit(1);
            }
        } catch (Exception ex) { ex.printStackTrace(); System.exit(1); }

        String media = "./audio";
        if (args.length > 0) {
            File file = new File(args[0]);
            if (file == null && !file.isDirectory()) {
                System.out.println("usage: java JavaSound audioDirectory");
            } else {
                media = args[0];
            }
        }

        final JavaSound demo = new JavaSound(media);
        JFrame f = new JFrame("Java Sound Demo");
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {System.exit(0);}
            public void windowDeiconified(WindowEvent e) { demo.open(); }
            public void windowIconified(WindowEvent e) { demo.close(); }
        });
        f.getContentPane().add("Center", demo);
        f.pack();
        Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
        f.setLocation(d.width/2 - demo.width/2, d.height/2 - demo.height/2);
        f.setSize(new Dimension(demo.width, demo.height));
        f.setVisible(true);
    }
}