Libao

Libao is a cross-platform audio library that allows programs to output audio using a simple API on a wide variety of platforms. It currently supports:

• Null output (handy for testing without a sound device)
• WAV files
• AU files
• RAW files
• OSS (Open Sound System, used on Linux and FreeBSD)
• ALSA (Advanced Linux Sound Architecture)
• aRts (Analog RealTime Synth, used by KDE)
• PulseAudio (next generation GNOME sound server)
• esd (EsounD or Enlightened Sound Daemon)
• MacOS X
• Windows (98 and later)
• AIX
• Sun/NetBSD/OpenBSD
• IRIX
• NAS (Network Audio Server)
• Roar Audio
• OpenBSD SNDIO

More Info

http://xiph.org/ao/