Subject: Re: [rtcweb] [MMUSIC] m-line recycling
From: Christer Holmberg <[email-masked]>
To: Justin Uberti <[email-masked]>, Martin Thomson <[email-masked]>
Cc: "[email-masked]" <[email-masked]>, mmusic WG <[email-masked]>
Date: Mon, 19 May 2014 04:49:49 +0000
List-Id: Real-Time Communication in WEB-browsers working group list <rtcweb.ietf.org>

Hi,

>One option could be to only reuse m= lines that both sides have stopped using (i.e. port=0, as >opposed to a=sendonly/recvonly). This provides most of the benefits of recycling without >having to deal with the notion of 'compatible'.

Are you suggesting a MUST reuse such m= line, if available?

Regards,

Christer

On Mon, May 12, 2014 at 7:43 AM, Martin Thomson <[email-masked]<mailto:[email-masked]>> wrote:

Yes, some words about being compatible and all that entails are required if we intend to stipulate it being reused. Either that or we can say MAY. The need for a strong definition diminishes then.
On May 11, 2014 11:54 PM, "Christer Holmberg" <[email-masked]<mailto:[email-masked]>> wrote:
Hi,

I don’t think it should be a MUST – at least not only based on the media type. Because, there may be other properties than the media type associated with the “m=” line, why one does not want to use it for the specific MST.

Regards,

Christer

From: mmusic [mailto:[email-masked]<mailto:[email-masked]>] On Behalf Of Eric Rescorla
Sent: 12. toukokuuta 2014 7:50
To: mmusic WG; [email-masked]<mailto:[email-masked]>
Subject: [MMUSIC] m-line recycling

The JSEP spec specifies m-line recycling:

 o  If any MediaStreamTracks have been added, and there exist m=

      sections of the appropriate media type with no associated

      MediaStreamTracks (i.e. as described in the preceding paragraph),

      those m= sections MUST be recycled by adding the new

      MediaStreamTrack to the m= section.  This is done by adding the

      necessary "a=msid", "a=ssrc", and "a=ssrc-group" lines to the

      recycled m= section, and removing the "a=recvonly" attribute.

Based on the minutes from IETF 89, we were going to take this to mmusic.

http://etherpad.tools.ietf.org:9000/p/notes-ietf-89-rtcweb?useMonospaceFont=true

Thoughts?

-Ekr

https://github.com/rtcweb-wg/jsep/issues/21

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