Seth Hampson 7fa6ee6250 Adds support for "-" to a=ssrc msid lines.
Currently with in Unified Plan an initial offer will include both
"a=ssrc:... msid:..." lines and "a=msid:... ..." lines. The a=ssrc line
is added in order to support signaling to a Plan B endpoint. Although if
no stream is associated to a given track it will only be signaled in the
"a=msid" line with "-". The "a=ssrc msid" line will simply put an empty
string for the msid, which does not interoperate with FF. This change
adds support so that both lines will signal a "-".

Bug: webrtc:9880
Change-Id: I73655ce3c11a924b508616d820555bf24aae1bd3
Reviewed-on: https://webrtc-review.googlesource.com/c/106605
Commit-Queue: Seth Hampson <shampson@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Reviewed-by: Seth Hampson <shampson@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25241}
2018-10-17 20:55:10 +00:00
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