AU

File Format
Name	AU
Ontology	Electronic File Formats Audio and Music AU
Extension(s)	.au, .snd
MIME Type(s)	audio/basic
PRONOM	x-fmt/139
Wikidata ID	Q672985
Kaitai Struct Spec	au.ksy

Sun Microsystems audio file (.au) is an audio file format commonly used on Sun & NeXT operating systems.

Format

Files have a 24-byte header, followed by a optional description field of at least 4 bytes, then the audio data.

Identification

Files begin with signature bytes 2e 73 6e 64 (".snd").

Specifications

• Oracle Solaris 11.2 man pages: au(4)
• http://pubs.opengroup.org/external/auformat.html

Software

• SoX - Sound eXchange

Sample files

• https://hg.java.net/hg/solaris~on-src/file/b23a4dab3d50/usr/src/cmd/audio/samples/au
• dexvert samples — audio/au

Resources

• Wikipedia:Au file format
• Audio File Format Specifications: AU or NeXT/Sun sound file