How to get gstream rtspsrc location uri or name of the element of current frame?

I have several rtspsrc source and using in my pipeline to make filter/calculations/object detection.

Is there any way to get current frame name or the rtspsrc location from the c++ to decide to branching the program ?

ie:

rtspsrc location=rtsp:///?h264x=4 name=source_2 message-forward=true rtspsrc location=rtsp:///?h264x=4 name=source_3 message-forward=true rtspsrc location=rtsp:///?h264x=4 name=source_4 message-forward=true

I want to get location=... or the name for current frame in my developed plugin.

Best