Re: [MMUSIC] BUNDLE and RTCP
Thomas Stach <thomass.stach@gmail.com> Mon, 19 October 2015 05:50 UTC
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To: Christer Holmberg <christer.holmberg@ericsson.com>,
"mmusic@ietf.org" <mmusic@ietf.org>
References: <7594FB04B1934943A5C02806D1A2204B37B66DC9@ESESSMB209.ericsson.se>
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From: Thomas Stach <thomass.stach@gmail.com>
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Date: Mon, 19 Oct 2015 07:50:14 +0200
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Subject: Re: [MMUSIC] BUNDLE and RTCP
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Christer, of course there are many possibilities. However it would be good to have some explicit signalling. Without inventing new signalling elements, you could use the first RTP m-line that appears in the a=group:BUNDLE attribute in the answer. So if you have in the offer: a=group:BUNDLE foo bar baz m=data channel 10000 a=mid:foo m=rtp 11111 a=mid:bar a=rtcp: 15000 m=rtp 11222 a=mid:baz a=rtcp: 20000 If you get back in the answer: a=group:BUNDLE foo bar baz ... then your RTCP port is 15000 If you get back a=group:BUNDLE foo baz bar then RTCP would go to 20000. Although I haven't thought it through completely it too much this could also work reasonably well of the answerer accepts only a subset of the offered m-lines. What do yo think? Regards Thomas Am 18.10.2015 um 19:53 schrieb Christer Holmberg: > > Hi, > > Note that the issue exists even without bundle-only m- lines: > > m=data channel 10000 > > m=rtp 11111 > > a=rtcp: 15000 > > m=rtp 11222 > > a=rtcp: 20000 > > Again, if the data channel m- line is selected as the offerer BUNDLE > address, which port will be used for RTCP? > > Regards, > > Christer > > *From:*mmusic [mailto:mmusic-bounces@ietf.org] *On Behalf Of *Christer > Holmberg > *Sent:* 18 October 2015 20:47 > *To:* mmusic@ietf.org > *Subject:* [MMUSIC] BUNDLE and RTCP > > Hi, > > During the proto write-up process of BUNDLE, an issue came up. > > Assume the following BUNDLE offer, with one non-bundle-only data > channel m- line and one bundle-only RTP m- line: > > m=data channel 10000 > > m=rtp 0 > > a=bundle-only > > Now, if bundle is accepted, the RTP m- line will get port 10000, as > defined in BUNDLE. So far so good. > > Now, if bundle is accepted, the data channel m- line will be selected > as the offerer BUNDLE address, and RTP will use port 1000. > > So far so good. > > Next, assume we want to negotiate an explicit RTCP port for RTP. As > the non-bundle-only m- line is not RTP (and therefore cannot contain > an rtcp attribute), we have to add the actual RTCP port value to the > bundle-only m- line: > > m=data channel 10000 > > m=rtp 0 > > a=bundle-only > > a=rtcp: 20000 > > So far so good. > > Now, assume we also have one non-bundle-only RTP m- line: > > m=data channel 10000 > > m=rtp 11111 > > a=rtcp: 15000 > > m=rtp 0 > > a=bundle-only > > a=rtcp: 20000 > > Now, assume the data channel m- line is selected as the offerer BUNDLE > address. It means that port 10000 will also be used for RTP. But, > which port will be used for RTCP? 15000 or 20000? > > Regards, > > Christer > > > > _______________________________________________ > mmusic mailing list > mmusic@ietf.org > https://www.ietf.org/mailman/listinfo/mmusic
- [MMUSIC] BUNDLE and RTCP Christer Holmberg
- Re: [MMUSIC] BUNDLE and RTCP Christer Holmberg
- Re: [MMUSIC] BUNDLE and RTCP Thomas Stach
- Re: [MMUSIC] BUNDLE and RTCP Christer Holmberg
- Re: [MMUSIC] BUNDLE and RTCP Thomas Stach
- Re: [MMUSIC] BUNDLE and RTCP Christer Holmberg
- Re: [MMUSIC] BUNDLE and RTCP Paul Kyzivat
- Re: [MMUSIC] BUNDLE and RTCP Christer Holmberg
- Re: [MMUSIC] BUNDLE and RTCP Paul Kyzivat
- Re: [MMUSIC] BUNDLE and RTCP Christer Holmberg
- Re: [MMUSIC] BUNDLE and RTCP Roman Shpount
- Re: [MMUSIC] BUNDLE and RTCP Wyss, Felix
- Re: [MMUSIC] BUNDLE and RTCP Jonathan Lennox
- Re: [MMUSIC] BUNDLE and RTCP Christer Holmberg