Philippe Gorley authored Dec 05, 2018 and Adrien Béraud committed Dec 05, 2018

Have an intermediate object subscribe to the media sources while also
keeping a copy of the stream name. The recorder can then keep a
reference to these to figure out the source of the frame, instead of
knowing what objects it subscribes to.

Change-Id: I4a34c8b035301eefc90645cf6cb500dbcd879f91