- Create an AudioClip object
- Load .au sound file into AudioClip
- Play sounds once or loop continuously
- Stop playback
Here's how the code for these steps looks:
import java.applet.*;
AudioClip ac = getAudioClip(getCodeBase(), soundFile);
ac.play(); //play once
ac.stop(); //stop playing
ac.loop(); //play continuously
It would seem logical to use this same code to play audio clips in a Java application. Unfortunately, if you do that you will
get errors from the compiler. Why? Because the AudioClip object and the getAudioClip() method are part of the
java.applet package -- and are not part of applications. The good news is we can dive down and make things work ourselves.
The trick to solving this problem is to use some
undocumented features that are provided by Sun in its JDK. Taking a peek inside the
classes.zip file from the Sun JDK (using any of the various zipfile utilities), we find not only the standard Java packages such as
java.applet but also
sun.audio. (These are in the directory sun/audio.)
The
sun.audio package contains everything we need to be able to play audio clips! Here's the code:
import sun.audio.*; //import the sun.audio package
import java.io.*;
//** add this into your application code as appropriate
// Open an input stream to the audio file.
InputStream in = new FileInputStream(Filename);
// Create an AudioStream object from the input stream.
AudioStream as = new AudioStream(in);
// Use the static class member "player" from class AudioPlayer to play
// clip.
AudioPlayer.player.start(as);
// Similarly, to stop the audio.
AudioPlayer.player.stop(as);
To use a URL as the audio stream source, substitute the following for the input stream and audio stream setup:
AudioStream as = new AudioStream (url.openStream());
Playing the audio stream continuously adds a bit more complexity:
// Create audio stream as discussed previously.
// Create AudioData source.
AudioData data = as.getData();
// Create ContinuousAudioDataStream.
ContinuousAudioDataStream cas = new ContinuousAudioDataStream (data);
// Play audio.
AudioPlayer.player.play (cas);
// Similarly, to stop the audio.
AudioPlayer.player.stop (cas);
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