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Re: [MMUSIC] [rtcweb] Updating JSEP and BUNDLE

Justin Uberti <juberti@google.com> Thu, 28 January 2021 20:16 UTC

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From: Justin Uberti <juberti@google.com>
Date: Thu, 28 Jan 2021 12:16:35 -0800
Message-ID: <CAOJ7v-0qLdjqdzGV7LKOy6o0Se0Rp2BgB9Zto+qkw-aovdBhZQ@mail.gmail.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>
Cc: Roman Shpount <roman@telurix.com>, "Murray S. Kucherawy" <superuser@gmail.com>, Magnus Westerlund <magnus.westerlund=40ericsson.com@dmarc.ietf.org>, "mmusic@ietf.org" <mmusic@ietf.org>
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Subject: Re: [MMUSIC] [rtcweb] Updating JSEP and BUNDLE
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On Thu, Jan 28, 2021 at 12:09 PM Christer Holmberg <
christer.holmberg@ericsson.com> wrote:

> Hi,
>
> ...
>
> >>> Look, I am as unhappy as anyone else that we have this issue to deal
> with. But this isn't an issue about what libwebrtc did or didn't do; this
> is an observation on the state of the WebRTC ecosystem in 2021. libwebrtc
> was unable to implement the standard
> >>> behavior 6 years ago because of application (not in libwebrtc!)
> incompatibilities when receiving port zero, and those incompatibilities
> have likely only multiplied over time. Ergo, we have to consider this
> situation as part of the problem space and resultant document update.
> >>
> >> So, what exactly were the issues with receiving port zero?
> >
> > The same as now - existing applications would suddenly treat this as a
> disabled m= section, when it previously worked fine.
>
> What do you mean by "previously"?
>
> Just to make sure I understand: if the application receives port zero +
> bundle-only, why does it treat is as a disabled m= section? Why doesn't it
> check the bundle-only attribute? I am just trying to understand what causes
> the problem...
>

Because applications exist that understand BUNDLE, but not port-zero with
a=bundle-only. So if one were to suddenly change the behavior of clients to
start using a=bundle-only, those applications would interpret these m=
sections as disabled. This is what I have been trying to say all along.

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