pub fn setup_of(
description: &SessionDescription,
stream: &MediaDescription,
) -> Option<Setup>Expand description
The setup role that applies to a stream: media level first, then the session default.
RFC 4145 allows a=setup at either level. Offer/answer and the eventual handshake must use
this same resolver or a session-level answer can be signalled correctly and acted on as though
it were missing.