et-sdl-sound provides SDL-based replacement for deprecated OSS-based sound systems of Enemy Territory, Return to Castle Wolfenstein and Quake III Arena. To put it short, et-sdl-sound is a working ALSA support hack for ET, RTCW and Q3 (and all mods for those binaries).
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At one point, Open Hub analyzed source code for this project based on code location(s) available at that time. Since then, the code locations have been removed.