Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-simulcast-03
Martin Thomson <martin.thomson@gmail.com> Fri, 23 October 2015 17:22 UTC
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Date: Fri, 23 Oct 2015 10:22:16 -0700
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From: Martin Thomson <martin.thomson@gmail.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>
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Subject: Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-simulcast-03
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On 23 October 2015 at 09:49, Paul Kyzivat <pkyzivat@alum.mit.edu> wrote: > simulcast-value = sc-send-opt [SP sc-recv-opt] > / sc-recv-opt I like this, but I think that it can be improved further. One annoying feature of your grammar is that this is valid: a=simulcast:send rid=1 paused=2 recv pt=3 This makes it much harder to parse than ideal because you can't just split on spaces, you have to process the paused as if it might also be "recv". It also permits rid and pt on the same line. How about: simulcast-value = simulcast-pt / simulcast-rid simulcast-pt = ( simulcast-pt-send [ SP simulcast-pt-recv ] ) / simulcast-pt-recv simulcast-rid = ( simulcast-rid-send [ SP simulcast-rid-recv ] ) / simulcast-rid-recv simulcast-pt-send = "send" SP simulcast-pt-args simulcast-pt-recv = "recv" SP simulcast-pt-args simulcast-pt-args = simulcast-pt-list *(";" simulcast-pt-list) simulcast-pt-list = payload-type *("," payload-type) simulcast-rid-send = "send" SP simulcast-rid-args simulcast-rid-recv = "recv" SP simulcast-rid-args simulcast-rid-args = simulcast-rid-list *(";" simulcast-rid-list) simulcast-rid-list = simulcast-rid-id *("," simulcast-rid-id) simulcast-rid-id = [simulcast-rid-paused] rid-identifier simulcast-rid-paused = "!" Which would have paused streams prefixed with a character (I chose "!" because it is the first character that is permitted by the SDP token grammar but not the rid-identifier grammar, feel free to paint that bikeshed any colour you like). This: a=simulcast: send rid=1,2,3 recv rid=4 paused=3 Becomes: a=simulcast:send rid=1,2,3 recv rid=4,!4 And this is now invalid: a=simulcast:send pt=1 recv=rid=2
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Peter Thatcher
- [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-simul… Adam Roach
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Adam Roach
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Paul Kyzivat
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Martin Thomson
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Paul Kyzivat
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Martin Thomson
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Martin Thomson
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Paul Kyzivat
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Martin Thomson
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Christer Holmberg
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Paul Kyzivat
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Christer Holmberg
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Martin Thomson
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Paul Kyzivat
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Paul Kyzivat
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Suhas Nandakumar
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Christer Holmberg
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Bo Burman
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Paul Kyzivat
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Suhas Nandakumar
- Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-s… Bo Burman