> I'm creating an audio "client" using RTPSource. I have a custom
> MediaSink-derived class which takes the traffic and routes it to my
> computer's audio device. Works great.
>
> What I'd like to do, however, is retrieve the sender's IP address (the IP
> address of the sender which is sending traffic to the port/ip as specified by
> my GroupSocks). How do I do this?
Unfortunately the sender’s IP address (and port number) aren’t exposed directly
by our “*RTPSource” code, but there is a hack that you can use to get this.
The trick (hack) is to define a subclass of the “Groupsock” class, and, in your
subclass, reimplement the virtual function
virtual Boolean handleRead(unsigned char* buffer, unsigned
bufferMaxSize, unsigned& bytesRead, struct sockaddr_in& fromAddressAndPort);
In your subclass, you would implement this virtual function as follows:
Boolean yourGroupsockSubclass::handleRead(unsigned char* buffer,
unsigned bufferMaxSize,
unsigned& bytesRead, struct
sockaddr_in& fromAddressAndPort) {
Boolean result = Groupsock::handleRead(buffer, bufferMaxSize,
bytesRead, fromAddressAndPort);
if (result) {
// “fromAddressAndPort” is the sender’s IP address (and
port number); record it
}
return result;
}
Then, you would create your “RTPSource” object with an object of your
“Groupsock" subclass, rather than with a regular “Groupsock”.
Also:
> RTCPInstance* rtcpInstance =
> RTCPInstance::createNew(*environment, &rtcpGroupSock, 5000, CNAME,
> NULL, rtpSource);
Before doing this, you should call
rtcpGroupSock.changeDestinationParameters()
with the sender’s IP address and port number, so that RTCP “RR” packets go back
to the sender. (And if you want to use “rtpGroupSock” to send audio back to
the sender (via a “RTPSink” object), then you should call
“changeDestinationParameters()” on “rtpGroupSock” as well.)
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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