The latest version of the "LIVE555 Streaming Media" software supports a new,
custom RTSP command: "REGISTER". This request is currently non-standard;
however, I will shortly be submitting an IETF Internet-Draft document that
describes it.
This command can be used to 'advertise' a RTSP stream (given by a "rtsp://"
URL) to a client application, or to a proxy server. In particular, a server
can use this command to advertise one of its own streams to a client
application (or proxy server), which then gets to reuse the TCP connection on
which it received the request. This can be useful if the server is behind a
firewall or NAT (e.g., on a mobile phone data network), but the client
application (or proxy server) is on the public Internet.
For (non-proxy) Servers:
====================
A LIVE555-based server application can 'advertise' one of its streams -
described by a "ServerMediaSession" object in a "RTSPServer" - by calling the
new member function:
"RTSPServer::registerStream()"
specifying the remote client application (or proxy server)'s name or IP
address, and port number. This will send a "REGISTER" request, advertising the
stream.
For Proxy Servers:
===============
To create a proxy server that automatically accepts incoming stream
'advertisements' (i.e., "REGISTER" requests), and proxies the advertised
"rtsp://" URL for each such incoming request, create a
"RTSPServerWithREGISTERProxying"
rather than a usual "RTSPServer".
(see "liveMedia/include/RTSPServer.hh").
(For an illustration of this, note how we implement the new '-R' command-line
option for the "LIVE555 Proxy Server".)
For Client Applications:
===================
A client application can create a simple server that accepts incoming
'advertisements' (i.e., "REGISTER" requests), and then automatically creates a
new "RTSPClient" object to handle the "rtsp://" URL specified by each such
incoming request. To do this, create a
"HandlerServerForREGISTERCommand"
object, by calling
"HandlerServerForREGISTERCommand::createNew()"
(see "liveMedia/include/RTSPClient.hh").
(For an illustration of this, note how we implement the new '-R' command-line
option for the "openRTSP" application.)
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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