Is something like this possible / doable with centova ?

http://mixstream.net/streaming/stream-authentication.php

Can somehow be able to authenticate users who wants to listen to a stream ?
something like pay-to-listen (for premium services for example, no ads stations etc)

I saw icecast has something like that.

Could be somehow integrated in centova?

http://www.icecast.org/docs/icecast-2.3.1/icecast2_listenerauth.html