> Now, a better question is, what's magic about 6970
grep 6970 liveMedia/include/*.hh
There’s nothing ‘magic’ about port number 6970; however, it was the default
starting port number for Apple's (formerly frequently used, but now defunct)
"QuickTime Media Server", so I decided to make this the default starting port
number for our RTSP server - in case people’s firewalls were set up to allow
port numbers in a small range, starting with 6970.
Our RTSP server implementation (actually, “OnDemandServerMediaSubsession”, for
unicast clients) chooses a port number to use for each client session. It does
this by iterating over port numbers - beginning with the starting port number -
until it finds one that is not in use (anywhere on the same host). *** This is
normal behavior; there is no ‘bug’ here. ***
You *could* change the starting port number by setting the “initialPortNum”
parameter (to something other than its default value of 6970) in the call to
the “ProxyServerMediaSession” constructor. To do this, though, you would need
to define your own subclass of “ProxyServerMediaSession”.
NOTE, HOWEVER, that this (‘per client session’) port number is COMPLETELY
SEPARATE from the RTSP server’s base port number (e.g., 554 or 8554) - which is
what the “-p” option specifies. So it’s completely irrelevant to your real
question:
> What I was trying to figure out was how get the proxy to just terminate if
> the specified port in the -p option was not available
This is real easy. Call
RTSPServer::createNew()
with the port number as (2nd) parameter. If the port is unavailable, then this
“createNew()” call will return NULL.
(See, for example, code in “proxyServer/live555ProxyServer.cpp”.)
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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