Re: [MMUSIC] "a=extmap" with BUNDLE
Byron Campen <docfaraday@gmail.com> Mon, 27 March 2017 17:55 UTC
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To: Taylor Brandstetter <deadbeef@google.com>, Iñaki Baz Castillo <ibc@aliax.net>
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Cc: mmusic WG <mmusic@ietf.org>
From: Byron Campen <docfaraday@gmail.com>
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Date: Mon, 27 Mar 2017 12:55:27 -0500
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Subject: Re: [MMUSIC] "a=extmap" with BUNDLE
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Would it not be sufficient to specify that bundled m-sections not use the same identifier for _different_ extensions? There's no ambiguity if you use '3' for mid on every m-section, which is the kind of thing implementations do now anyway. Best regards, Byron Campen On 3/27/17 12:44 PM, Taylor Brandstetter wrote: > If extension IDs aren't unique across bundled m= sections, then on > receiving a packet, an implementation may need to determine which m= > section it's "associated" with before knowing how to interpret the > extension IDs. To do this, it may need to use the MID, which means > that at a minimum, the MID extension must be using a unique ID. > > But this increases implementation complexity without much benefit (the > benefit being that by sharing IDs, you could more easily avoid running > out of spare IDs). So I'd be in favor of just requiring them to be unique. > > On Sat, Mar 25, 2017 at 6:35 PM, Iñaki Baz Castillo <ibc@aliax.net > <mailto:ibc@aliax.net>> wrote: > > 2017-03-24 19:28 GMT+01:00 Taylor Brandstetter > <deadbeef@google.com <mailto:deadbeef@google.com>>: > > saw that. Which means that individual documents are responsible > for defining > > how their extensions work with BUNDLE. > > > > But something still would need to define the general > restrictions for using > > "extmap" with BUNDLE, such as the ID restriction. Or is that > just something > > that's common sense and doesn't need to be specified? > > https://tools.ietf.org/html/rfc5285#section-6 > <https://tools.ietf.org/html/rfc5285#section-6> just mandates that the > IDs must be unique within a m= section, but at the end, all the WebRC > implementations use unique ID values across the entire SDP. > > There are some RTP extensions, such as > http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01 > <http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01>, > that work at *transport* level (rather than at m= section level), but > nothing prevents such a spec to work even if its ID is not unique > within the m= sections. > > This is, IMHO we don't need a global behavior/requirement for the ID > values within bundled m= sections. > > > -- > Iñaki Baz Castillo > <ibc@aliax.net <mailto:ibc@aliax.net>> > > > > > _______________________________________________ > mmusic mailing list > mmusic@ietf.org > https://www.ietf.org/mailman/listinfo/mmusic
- [MMUSIC] "a=extmap" with BUNDLE Taylor Brandstetter
- Re: [MMUSIC] "a=extmap" with BUNDLE Suhas Nandakumar
- Re: [MMUSIC] "a=extmap" with BUNDLE Taylor Brandstetter
- Re: [MMUSIC] "a=extmap" with BUNDLE Iñaki Baz Castillo
- Re: [MMUSIC] "a=extmap" with BUNDLE Taylor Brandstetter
- Re: [MMUSIC] "a=extmap" with BUNDLE Byron Campen
- Re: [MMUSIC] "a=extmap" with BUNDLE Iñaki Baz Castillo
- Re: [MMUSIC] "a=extmap" with BUNDLE Iñaki Baz Castillo
- Re: [MMUSIC] "a=extmap" with BUNDLE Taylor Brandstetter
- Re: [MMUSIC] "a=extmap" with BUNDLE Iñaki Baz Castillo
- Re: [MMUSIC] "a=extmap" with BUNDLE Paul Kyzivat
- Re: [MMUSIC] "a=extmap" with BUNDLE Mo Zanaty (mzanaty)
- Re: [MMUSIC] "a=extmap" with BUNDLE Suhas Nandakumar
- Re: [MMUSIC] "a=extmap" with BUNDLE Iñaki Baz Castillo