Mega Code Archive
Sound Applet
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* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
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import java.applet.AudioClip;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.net.URL;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JPanel;
public class SoundApplet extends JApplet implements ActionListener,
ItemListener {
AppletSoundList soundList;
String auFile = "spacemusic.au";
String aiffFile = "flute+hrn+mrmba.aif";
String midiFile = "trippygaia1.mid";
String rmfFile = "jungle.rmf";
String wavFile = "bottle-open.wav";
String chosenFile;
AudioClip onceClip, loopClip;
JComboBox formats;
JButton playButton, loopButton, stopButton;
boolean looping = false;
public void init() {
String[] fileTypes = { auFile, aiffFile, midiFile, rmfFile, wavFile };
formats = new JComboBox(fileTypes);
formats.setSelectedIndex(0);
chosenFile = (String) formats.getSelectedItem();
formats.addItemListener(this);
playButton = new JButton("Play");
playButton.addActionListener(this);
loopButton = new JButton("Loop");
loopButton.addActionListener(this);
stopButton = new JButton("Stop");
stopButton.addActionListener(this);
stopButton.setEnabled(false);
JPanel controlPanel = new JPanel();
controlPanel.add(formats);
controlPanel.add(playButton);
controlPanel.add(loopButton);
controlPanel.add(stopButton);
getContentPane().add(controlPanel);
startLoadingSounds();
}
public void itemStateChanged(ItemEvent e) {
chosenFile = (String) formats.getSelectedItem();
soundList.startLoading(chosenFile);
}
void startLoadingSounds() {
//Start asynchronous sound loading.
soundList = new AppletSoundList(this, getCodeBase());
soundList.startLoading(auFile);
soundList.startLoading(aiffFile);
soundList.startLoading(midiFile);
soundList.startLoading(rmfFile);
soundList.startLoading(wavFile);
}
public void stop() {
onceClip.stop(); //Cut short the one-time sound.
if (looping) {
loopClip.stop(); //Stop the sound loop.
}
}
public void start() {
if (looping) {
loopClip.loop(); //Restart the sound loop.
}
}
public void actionPerformed(ActionEvent event) {
//PLAY BUTTON
Object source = event.getSource();
if (source == playButton) {
//Try to get the AudioClip.
onceClip = soundList.getClip(chosenFile);
onceClip.play(); //Play it once.
stopButton.setEnabled(true);
showStatus("Playing sound " + chosenFile + ".");
if (onceClip == null) {
showStatus("Sound " + chosenFile + " not loaded yet.");
}
return;
}
//START LOOP BUTTON
if (source == loopButton) {
loopClip = soundList.getClip(chosenFile);
looping = true;
loopClip.loop(); //Start the sound loop.
loopButton.setEnabled(false); //Disable loop button.
stopButton.setEnabled(true);
showStatus("Playing sound " + chosenFile + " continuously.");
if (loopClip == null) {
showStatus("Sound " + chosenFile + " not loaded yet.");
}
return;
}
//STOP LOOP BUTTON
if (source == stopButton) {
if (looping) {
looping = false;
loopClip.stop(); //Stop the sound loop.
loopButton.setEnabled(true); //Enable start button.
} else if (onceClip != null) {
onceClip.stop();
}
stopButton.setEnabled(false);
showStatus("Stopped playing " + chosenFile + ".");
return;
}
}
}
//Loads and holds a bunch of audio files whose locations are specified
//relative to a fixed base URL.
class AppletSoundList extends java.util.Hashtable {
JApplet applet;
URL baseURL;
public AppletSoundList(JApplet applet, URL baseURL) {
super(5); //Initialize Hashtable with capacity of 5 entries.
this.applet = applet;
this.baseURL = baseURL;
}
public void startLoading(String relativeURL) {
new AppletSoundLoader(applet, this, baseURL, relativeURL);
}
public AudioClip getClip(String relativeURL) {
return (AudioClip) get(relativeURL);
}
public void putClip(AudioClip clip, String relativeURL) {
put(relativeURL, clip);
}
}
class AppletSoundLoader extends Thread {
JApplet applet;
AppletSoundList soundList;
URL baseURL;
String relativeURL;
public AppletSoundLoader(JApplet applet, AppletSoundList soundList,
URL baseURL, String relativeURL) {
this.applet = applet;
this.soundList = soundList;
this.baseURL = baseURL;
this.relativeURL = relativeURL;
setPriority(MIN_PRIORITY);
start();
}
public void run() {
AudioClip audioClip = applet.getAudioClip(baseURL, relativeURL);
soundList.putClip(audioClip, relativeURL);
}
}
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