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Re: [rtcweb] draft-ietf-rtcweb-jsep-08

Justin Uberti <juberti@google.com> Wed, 05 November 2014 00:58 UTC

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From: Justin Uberti <juberti@google.com>
Date: Tue, 04 Nov 2014 16:58:20 -0800
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To: Paul Kyzivat <pkyzivat@alum.mit.edu>
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Subject: Re: [rtcweb] draft-ietf-rtcweb-jsep-08
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On Tue, Nov 4, 2014 at 1:52 PM, Paul Kyzivat <pkyzivat@alum.mit.edu> wrote:

> I have a few related comments on jsep-08:
>
> Section 4.1.1 defines the BUNDLE policy values. It certainly appears that
> when you are using the default "balanced" policy there will be *separate*
> bundle groups for audio and video, and that the SCTP m-line will not be
> bundled.
>

This is not correct. Rather, the m= lines for these groups will not be
marked as a=bundle-only.

>
> However section 5.2.1 says:
>
>    Once all m= sections have been generated, a session-level "a=group"
>    attribute MUST be added as specified in [RFC5888].  This attribute
>    MUST have semantics "BUNDLE", and MUST include the mid identifiers of
>    each m= section.  The effect of this is that the browser offers all
>    m= sections as one BUNDLE group.  However, whether the m= sections
>    are bundle-only or not depends on the BUNDLE policy.
>
> This doesn't deal with bundle policy - this rule seems to apply only to
> max-compat policy.


> Section 7.1 says that both Alice and Bob are using the "balanced" policy,
> which should lead to separate bundles for audio and video, but the example
> shows a single bundle - consistent with a "max-bundle" policy. There are no
> examples that show more than one bundle group.
>
>
Right. JSEP endpoints always try to BUNDLE (and rtcp-mux). Legacy endpoints
can of course reject this.

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