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Re: [rtcweb] [MMUSIC] m-line recycling

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 19 May 2014 04:49 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Justin Uberti <juberti@google.com>, Martin Thomson <martin.thomson@gmail.com>
Thread-Topic: [MMUSIC] [rtcweb] m-line recycling
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Date: Mon, 19 May 2014 04:49:49 +0000
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Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>, mmusic WG <mmusic@ietf.org>
Subject: Re: [rtcweb] [MMUSIC] m-line recycling
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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 <martin.thomson@gmail.com<mailto:martin.thomson@gmail.com>> 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" <christer.holmberg@ericsson.com<mailto:christer.holmberg@ericsson.com>> 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:mmusic-bounces@ietf.org<mailto:mmusic-bounces@ietf.org>] On Behalf Of Eric Rescorla
Sent: 12. toukokuuta 2014 7:50
To: mmusic WG; rtcweb@ietf.org<mailto:rtcweb@ietf.org>
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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