As you can see, both OpenAL and SDL support all major platforms.
Creative as a multiplatform positional audio SDK. It is very easy to use.
computers running Microsoft Windows only. It has two components - DirectSound
and DirectMusic. DirectSound is older, more archaic, and more low-level,
while DirectMusic is the "way of the future", supporting more
high-level loading and playing of audio files and interactive music. It
is specifically geared toward games, but is useful for any audio application.
audio SDK with very basic functionality. It is geared toward playback
more than anything, so don't expect to use it to create a professional
studio recording application.
Steinberg, ASIO is specifically geared toward professional audio applications
and is supported by most major Windows-based multitracking applications,
including Steinberg's own Cubase series.
multiplatform API. If asked which API was the best, this would be our
answer. The price, however, reflects the quality, although it is more
accessible to non-commercial developers via its freeware licensing.
Linux Sound Architecture, a sound programming interface for Linux. Although
it is well-written, the documentation is terrible. Your best bet is to
look at some source code.
The Open Sound System, used with Linux kernels prior
to 2.6 and on Solaris.
Core Audio is the MacOS audio SDK.