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OpenAL

OpenAL (Open Audio Library) is a cross-platform audio application programming interface (API). It is designed for efficient rendering of multichannel three-dimensional positional audio. Its API style and conventions deliberately resemble those of OpenGL. Early versions of the framework were open source software, but the later revisions are proprietary.

OpenAL is an environmental 3D audio library that aims to provide an open replacement for proprietary (and generally incompatible with one another) 3D audio systems such as EAX and A3D. OpenAL can add realism to a game by simulating attenuation (degradation of sound over distance), the Doppler effect (change in frequency as a result of motion), and material densities.