SIPLEX is a program that demonstrates two SRT features:¶

- using one UDP outgoing port for multiple connecting SRT sockets - setting a resource ID on a socket visible on the listener side

The <SRT URI> will be input or output depending on the further -i/-o option. The URIs specified as -i INPUT... will be used for input and therefore SRT for output, and in the other way around if you use -o OUTPUT... For every such URI you must specify additionally a parameter named 'id', which will be interperted by the application and used to set resource id on an SRT socket when connecting or to match with the id extracted from the accepted socket of incoming connection. Example:

Sender:

srt-multiplex srt://remhost:2000 -i udp://:5000?id=low udp://:6000?id=high

Receiver:

srt-multiplex srt://:2000 -o output-high.ts?id=high output-low.ts?id=low

Here you create a Sender which will connect to 'remhost' port 2000 using multiple SRT sockets, all of which will be using the same outgoing port. Here the port is autoselected by the first socket when connecting, every next one will reuse that port. Alternatively you can enforce the outgoing port using 'port' parameter in the SRT URI.

Then for every input resource a separate connection is made and appropriate resource id will be set to particular socket assigned to that resource according to the 'id' parameter. When the listener side (here Receiver) gets the socket accepted, it will have the resource id set just as the caller side did, in which case srt-multiplex will search for this id among the registered resources and match the resource (output here) with this id. If the resource is not found, the connection is closed immediately. This works the same way regardless of which direction is used by caller or listener