[MMUSIC] Modifying an approved document: MSID

Ted pointed out to me that I sent this to the wrong group.

Chairs and members, please advise.

-------- Forwarded Message --------
Subject: 	[rtcweb] Modifying an approved document: MSID
Date: 	Wed, 18 Jan 2017 23:22:14 +0100
From: 	Harald Alvestrand <harald@alvestrand.no>
To: 	rtcweb@ietf.org <rtcweb@ietf.org>

When reviewing the implications of the PeerConnection API change to
support AddTrack rather than AddStream, I found an issue.

This issue concerns draft-ietf-rtcweb-msid, which is currently in
REF-WAIT state (I believe).

The issue is that it is possible to add a track without specifying a
stream. Since the track's ID needs to be carried, we have to send an
"a=msid" line, but the track's ID is the *second* field on that line,
with the first being the stream's ID.

This creates a problem.

Suggested fix: Insert two lines in the document:

1) On SDP generation:

"If there is no stream associated with the track, use the reserved ID
value '-'"

2) On SDP parsing

"If the stream ID is the reserved value '-', the track is not associated
with a stream, and no stream is signalled or created."

If this is OK with the community, I'll issue an updated draft with this
change.

-- 
Surveillance is pervasive. Go Dark.

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