AU : Java Glossary

by Roedy Green ©1996-2008 Canadian Mind Products
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AU

a format for sound files that Java and Unix systems use. Sometimes called Sun Audio Format. Applets play the files with Applet.getAudioClip and Applet.play methods. Applications use AudioPlayer.player.start( inputstream ). I have written a Java class called Sound to to generate *.AU files in RAM mathematically. You can Download it free.. It also converts *.AU files encoded with 8-bit mu-law back into 16-bit linear samples for mathematical analysis. Java can only play 8 bit, mu-law-encoded, 8000 Hz, one-channel (mono), AU files. There are other AU variants it cannot handle yet. How do you play sounds one after the other? How do you know when one has finished. You can estimate the time a sample will take to play by the sample count (or more roughly by the simple length of the file.) An AudioPlayer implementation might:

Enqueue AU files to be played.
Play all the AU files given to it simultaneously.
Fail, perhaps annoying the user with a dialog box, if you give it more than one at a time.

You have to code defensively.

To convert Microsoft Windows WAVfiles to AU format you need some sort of utility such as the shareware Goldwave.

AU files are very bulky. Often MP3 files are used to save transmission time.

Click to test your browser’s AU support . You can also test to see if you browser supports *.au files at this amusing web page.

AIF
Applets: using sound
Goldwave
JMF: Java Media Framework streaming video
MP3
sound
wav
WMF

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