I assume by "recording" you mean reading from an microphone source? (I can't imagine any other way to figure out if an application is recording.)
Also, I'm not sure whether turning the icon red is enough to convey "an application is using the microphone". Maybe we can get some design input before implementing this?
By the way, this will most likely be implemented in indicator-sound, not pulseaudio.
I assume by "recording" you mean reading from an microphone source? (I can't imagine any other way to figure out if an application is recording.)
Also, I'm not sure whether turning the icon red is enough to convey "an application is using the microphone". Maybe we can get some design input before implementing this?
By the way, this will most likely be implemented in indicator-sound, not pulseaudio.