I hope this isn't a foolish question. I'm lucky enough to have a laptop that supports Dolby Headphone output, but may upgrade in the next year. Now that I've upgraded my headphones to take advantage of a personal space surround sound experience with games, I'd like to keep using Dolby Headphone mode but it seems that very few computers (and fewer laptops) support it.
Does Dolby Headphone decoding require a dedicated chipset solution in the computer, or could it be processed in software? If it could be done via software, why doesn't Dolby seem to offer a paid app to do exactly that?
If I want to output Dolby Headphone mode from a laptop, are my buying choices limited to models which already support it? Since I own an astro mixamp (which I primarily use with consoles), would this pick up and decode a Dolby Digital signal from a laptop which doesn't natively support Dolby Headphone?