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Re: [MMUSIC] Simulcast and 5576 source attributes?

Bo Burman <bo.burman@ericsson.com> Mon, 13 November 2017 03:49 UTC

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From: Bo Burman <bo.burman@ericsson.com>
To: Jonathan Lennox <jonathan@vidyo.com>, mmusic <mmusic@ietf.org>
Thread-Topic: [MMUSIC] Simulcast and 5576 source attributes?
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Subject: Re: [MMUSIC] Simulcast and 5576 source attributes?
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One "certain case" is when using a 1:1 mapping of rid-id and RTP PT, in combination with a 1:1 mapping of SSRC and RTP PT. This would e.g. be:
a=rid:<rid-id1> pt=<pt1>
a=ssrc:<ssrc1> fmtp:<pt1>
a=rid:<rid-id2> pt=<pt2>
a=ssrc:<ssrc2> fmtp:<pt2>
a=simulcast:send 1,2

This way, ssrc1 can be known to use rid-id1 and ssrc2 rid-id2, via knowledge what RTP PT they use. Therefore, which simulcast stream uses which SSRC is also known.

Cheers
Bo
(as individual)


-------- Original Message --------
Subject: [MMUSIC] Simulcast and 5576 source attributes?
From: Jonathan Lennox <jonathan@vidyo.com>
Date: 9 nov. 2017 15:25
To: mmusic <mmusic@ietf.org>

The latest Simulcast draft (draft-ietf-mmusic-sdp-simulcast-10) has a paragraph at the end of Section 5.1 that says:

   It is possible to use source-specific signaling [RFC5576] with
   "a=simulcast", but it is only in certain cases possible to learn from
   that signaling which SSRC will belong to a particular simulcast
   stream.

However, there’s no other mention of 5576 in the document, and no registration of any 5576-style source-specific attributes.

What are the “certain cases”? It’s not clear to me there’s any way for the currently-registered 5576 attributes to tell you which SSRC corresponds to which simulcast stream, prior to receiving RID in RTCP or header extensions.  (Notably, there’s no rid source attribute.)


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