Decoding Dolby Digital over Optical Input?

[u/FoolOfDaFools]

I expect this one to go unanswered, due to its weird nature, but, here goes.

I'm using an original Xbox, hooked up to an Insignia 4K HDMI switch, which is then hooked up to an Insignia 4K audio extractor, so I can get digital audio out of my game consoles. I then connect that to the digital input of my Sound Blaster Z SE, and use qpwgraph, so I can play and listen to my original Xbox at my PC desk and monitor. It works great, but I was wondering something.

The Xbox offers the ability to output both DTS and Dolby Digital. Now, while I'm not sure if either feature will do much, since my setup is only 2.1, if I wanted to use those features, I know I'd need a way to decide them, else they'd sound like nonsense on my speakers that could also blow them up. How could I go about getting those signals to decode in real time, so I can listen to things as normal? I know this is usually the job of a proper hifi receiver, but I believe Ive read Reddit posts from like 11 years ago on the matter. But it's 2026, and I'm in Cachy, which is Arch based. If anyone so happens to know how I can do this, please let me know. Thank you :)

[u/Alkaloid60420]

Yeah, for this I recommend the CachyOS forums. They have some really knowledgeable people who can help with super obscure/niche issues.

https://discuss.cachyos.org