Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-simulcast-03

Paul Kyzivat <pkyzivat@alum.mit.edu> Sat, 24 October 2015 15:46 UTC

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To: Martin Thomson <martin.thomson@gmail.com>
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From: Paul Kyzivat <pkyzivat@alum.mit.edu>
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Date: Sat, 24 Oct 2015 11:46:22 -0400
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Subject: Re: [MMUSIC] Open Issues: draft-ietf-mmusic-sdp-simulcast-03
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I'm like this less than the prior proposal. I find it less intuitive 
than decorating each id to indicate if paused. But we are probably bike 
shedding.

	Thanks,
	Paul

On 10/24/15 11:32 AM, Martin Thomson wrote:
> On 23 October 2015 at 11:10, Martin Thomson <martin.thomson@gmail.com> wrote:
>> On 23 October 2015 at 11:00, Paul Kyzivat <pkyzivat@alum.mit.edu> wrote:
>>> But I'm not loving "!" - it is hard to distinguish from "1". Of course this
>>> isn't a problem for parsers, only for us humans reading examples and traces.
>>> I would prefer some other character, perhaps "-", "~" or "/".
>>
>>
>> As I said, I'm not partial to it.  It was selected on the basis that
>> it was the first valid choice.  I have no problem with "~" or "/",
>> though "-" is a valid rid identifier character.
>
>
> Alternative:
>
> simulcast-rid-args = simulcast-rid-option *(";" simulcast-rid-option)
> simulcast-rid-option = simulcast-rid-list [ "/" simulcast-rid-list ]
> simulcast-rid-list = rid-identifier *("," rid-identifier)
>
> Where everything after a slash is paused, e.g.,
>
> a=simulcast:send rid=1,2,3/4,5;1,2/3,4,5
>
> Noting that this makes the set of paused streams selectable.  The
> original grammar did not.  I don't know if that makes sense.  If not,
> then:
>
> simulcast-rid-args = simulcast-rid-list *(";" simulcast-rid-list)
>                                 ["/" simulcast-rid-list]
> simulcast-rid-list = rid-identifier *("," rid-identifier)
>
> Which is simpler, e.g.,
>
> a=simulcast:send rid=1,2,3;1,2/4,5
>