Re: [MMUSIC] Bundle offer with different ports - where to expect media?
Justin Uberti <juberti@google.com> Wed, 22 May 2013 05:01 UTC
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From: Justin Uberti <juberti@google.com>
Date: Tue, 21 May 2013 22:00:56 -0700
Message-ID: <CAOJ7v-2xXb=uz3jBAKSXhyJ2mU9BGvYHZ=dkeKcZTWov7udWKQ@mail.gmail.com>
To: Martin Thomson <martin.thomson@gmail.com>
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Cc: mmusic <mmusic@ietf.org>, Paul Kyzivat <pkyzivat@alum.mit.edu>, Christer Holmberg <christer.holmberg@ericsson.com>
Subject: Re: [MMUSIC] Bundle offer with different ports - where to expect media?
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On Tue, May 21, 2013 at 4:29 PM, Martin Thomson <martin.thomson@gmail.com>wrote: > On 21 May 2013 15:38, Justin Uberti <juberti@google.com> wrote: > > Lots of discussion here; is this an accurate summary of the discussed > > behavior? > > Yeah, this discussion was too much for me to track properly. > > > 1) BUNDLE offerers must be able to receive on any port (until they get a > > BUNDLE-compatible answer) > > 2) Once the answer is received, bundling is activated, and BUNDLEs use > the > > port of the first non-rejected m= line in the offer > > 2a) at this point, the other ports can be discarded > > 3) All m= lines offered in a BUNDLE must be present in the answer, unless > > they are rejected > > 3a) no selective unbundling/BUNDLE splitting is permitted > > Only one qualm with that last item. Agree with the splitting, but I > believe that the restriction on unbundling only applies if you create > an offer that assumes bundle support (i.e., same transport parameters > on every m-line). This is the optimized option that I expect we'll > need a constraint for in WebRTC. In that case, you don't have a port > to use for the unbundled m-line. > > It should be possible to have a new m-line negotiated out of a bundle > (but not into another bundle). It's just a refinement of the > answerer-does-not-support-BUNDLE case. > I agree. This carries over into subsequent offers - if you add a m= line that assumes BUNDLEing (i.e. uses the same transport parameters as an existing m= line), the recipient cannot choose to unBUNDLE it. Taking into account Emil's suggestion as well, this leads to this restatement of the rules: 1.1) An offerer must be prepared to receive unbundled traffic on the offered ports, as if talking to a legacy endpoint. 1.2) An offerer must be prepared to receive bundled traffic on any port, except the port associated with the last m= line. 2) Once the answer is received, the decision on bundled/unbundled and which ports to use is finalized. 2.1) BUNDLEd m= lines use the port of the m= line that appears first in the bundle. 2.2) Unused ports can be discarded at this point. 3.1) m= lines offered with distinct ports may be omitted from the bundle answer, in line with RFC 5888. 3.2) m= lines offered with the same port may not be omitted from the bundle answer, since there is no unbundled port from them to fall back to. 3.3) m= lines that are rejected are omitted from the bundle answer, per RFC 5888. Quick check on 2.1: are we using the m= line that appears first in the SDP, or the m= line that appears first in the a=group:BUNDLE?
- [MMUSIC] Bundle offer with different ports - wher… Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Hutton, Andrew
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Hutton, Andrew
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Cullen Jennings (fluffy)
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Justin Uberti
- Re: [MMUSIC] Bundle offer with different ports - … Justin Uberti
- Re: [MMUSIC] Bundle offer with different ports - … Eric Rescorla
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Martin Thomson
- Re: [MMUSIC] Bundle offer with different ports - … Justin Uberti
- Re: [MMUSIC] Bundle offer with different ports - … Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] Bundle offer with different ports - … Kevin Dempsey
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] Bundle offer with different ports - … Justin Uberti
- Re: [MMUSIC] Bundle offer with different ports - … Justin Uberti
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] Bundle offer with different ports - … Dale R. Worley
- Re: [MMUSIC] Bundle offer with different ports - … Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Suhas Nandakumar
- Re: [MMUSIC] Bundle offer with different ports - … Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Emil Ivov
- Re: [MMUSIC] Bundle offer with different ports - … Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Cullen Jennings (fluffy)
- Re: [MMUSIC] Bundle offer with different ports - … Cullen Jennings (fluffy)
- [MMUSIC] When a bundle offer is forked Paul Kyzivat
- Re: [MMUSIC] When a bundle offer is forked Parthasarathi R
- Re: [MMUSIC] When a bundle offer is forked Paul Kyzivat
- Re: [MMUSIC] Bundle offer with different ports - … Martin Thomson
- Re: [MMUSIC] When a bundle offer is forked Martin Thomson
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] When a bundle offer is forked Paul Kyzivat
- Re: [MMUSIC] When a bundle offer is forked Dale R. Worley
- Re: [MMUSIC] Bundle offer with different ports - … Martin Thomson
- Re: [MMUSIC] When a bundle offer is forked Christer Holmberg
- Re: [MMUSIC] When a bundle offer is forked Parthasarathi R
- Re: [MMUSIC] When a bundle offer is forked Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] When a bundle offer is forked Parthasarathi R
- Re: [MMUSIC] When a bundle offer is forked Christer Holmberg
- Re: [MMUSIC] Bundle offer with different ports - … Martin Thomson
- Re: [MMUSIC] Bundle offer with different ports - … Martin Thomson
- Re: [MMUSIC] Bundle offer with different ports - … Paul Kyzivat
- Re: [MMUSIC] Bundle offer with different ports - … Martin Thomson
- Re: [MMUSIC] When a bundle offer is forked Cullen Jennings (fluffy)