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SDP has the syntax:
a=extmap:<id>/<direction> <uri>
The / part is optional (and rarely seen it in the wild).
The current MediaEngine API makes it seem like it's possible to provide many directions for each map (it takes a Vec). This commit changes that sov only single optional direction can be provided.
This simplifies internal matching logic and fixes a bug where setting the transceiver direction
inactive
, would (incorrectly) result in no extmaps matching for the m-line.