Detect when audio is active

I've not looked into what APIs might be available but I would love to have the AFK detection be able to detect when I'm on a video conference and listening / speaking versus actually AFK. Given the various audio privacy features I'm hopeful we can find some hooks to check for active programs bound to a mic input versus just speaker output.

It might be sane to say if a microphone is present AND it's bound to an application then extend the AFK timeout to say 30 minutes. This wouldn't really cover webinar style one way presentations but at least we can get halfway there :)