Re:Source code for Quake 2 rerelease
by rasz on Friday August 11, 2023 @03:07PM
(#37092586)
Original Doom used proprietary DMX audio library https://doomwiki.org/wiki/DMX, didnt stop Carmack and Raven from releasing sources.
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Per the article they only open sourced the Linux port, which had already had DMX stripped out and replaced with an open source alternative.
Engines have grown a bit more complex since then anyway, there isn't an open source library that could easily replace Wwise.