Commit 1381e3e2 authored by
sdp: Add support for parsing the extmap attribute from caps and storing inside caps
The extmap attribute allows mapping RTP extension header IDs to well-known RTP extension header specifications. See RFC8285 for details. We store the extmap attribute either as string in the caps extmap-X=extensionname where X is the integer extension header ID, or as 3-tuple of strings extmap-X=<direction,extensionname,extensionattributes> where direction or extensionattributes are allowed to be the empty string. Both formats are allowed because usually only the extension name is given and it's much simpler to handle in caps.
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