Subject: Re: [rtcweb] [MMUSIC] m-line recycling
From: Justin Uberti <[email-masked]>
To: Martin Thomson <[email-masked]>
Cc: "[email-masked]" <[email-masked]>, mmusic WG <[email-masked]>
Date: Sun, 18 May 2014 20:37:44 -0700
List-Id: Real-Time Communication in WEB-browsers working group list <rtcweb.ietf.org>

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'.

On Mon, May 12, 2014 at 7:43 AM, Martin Thomson <[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]> 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]] *On Behalf Of *Eric
>> Rescorla
>> *Sent:* 12. toukokuuta 2014 7:50
>> *To:* mmusic WG; [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
>>
>> _______________________________________________
>> rtcweb mailing list
>> [email-masked]
>> https://www.ietf.org/mailman/listinfo/rtcweb
>>
>>
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