Re: [rtcweb] Fwd: New Version Notification for draft-alvestrand-mmusic-simulcast-ssrc-00.txt

Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com> Thu, 11 April 2019 14:45 UTC

Return-Path: <sergio.garcia.murillo@gmail.com>
X-Original-To: rtcweb@ietfa.amsl.com
Delivered-To: rtcweb@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 12B481202D7 for <rtcweb@ietfa.amsl.com>; Thu, 11 Apr 2019 07:45:08 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.998
X-Spam-Level:
X-Spam-Status: No, score=-1.998 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yuseh1_Fa7ul for <rtcweb@ietfa.amsl.com>; Thu, 11 Apr 2019 07:45:04 -0700 (PDT)
Received: from mail-ed1-x532.google.com (mail-ed1-x532.google.com [IPv6:2a00:1450:4864:20::532]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7EA2C1200B8 for <rtcweb@ietf.org>; Thu, 11 Apr 2019 07:45:04 -0700 (PDT)
Received: by mail-ed1-x532.google.com with SMTP id w3so5433175edu.10 for <rtcweb@ietf.org>; Thu, 11 Apr 2019 07:45:04 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-language; bh=7VSZh6UcP76pm8S8oxT8Eo8NtQ3/Z4MFx5s4VtlDWnY=; b=VvpcvcfbgHwG0G20m3ZXpjWiYukyGcwWToEvunZkfIC0yFsi2DwtS74KTrf4Oo+yVR ax2CzjUFCHxweY6un9KvG8NsEIyBTkCFDeqK7RYubExW0Oa634edEbfylcy75PsxQTwf VovmTTp3cV4JOopI0MXtWWDx6Kozsyq9dKkJp82PGeJhmIrN+Wmu9oLaQP0jADXO/SXn M7QdbD9MfJNqmeGUA/z46RARuR086fXaOcNMphRwy2HCUFLg7aTIGqFP4CYHQGfINxIE 9AbN7m8mkULnUt+DQgJ93Ykiu6Iqb+rqdVqZpKSpjG4pyxHGCrN40x6BoKTKdVMypsol xg/g==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language; bh=7VSZh6UcP76pm8S8oxT8Eo8NtQ3/Z4MFx5s4VtlDWnY=; b=bEqsh4uXvxhR5thrrH7pUbxCQyRKZCUJrKDiwCJWQ42/T6vBsLc0A4L1hIPkvn2zDK +dIdf59gBjWgVVTf8cgjtzLlRgG3OIc1k/iHmCkcgpf9tleurSFdNUEuZCyCCk1euEXw TgjhChLU4pSclMHTwfBOpjxngmIxHZqQwDUoIXVq1Vd2K3f/09hTaI5UKUoy+l8fbjvr 1TdMeoNf30T2Y21ihxTuzI+k5H0erFg0ynY1u3dWHy8MgXInklrCNkSFTlutMfvdxCfp neuA8LSf9UbkPxZop7uPINOszENSbGc+5WEO4nV8OkMrBFZbhdb0po77ohEtT7oPVLZM vJfg==
X-Gm-Message-State: APjAAAXk/Qc+8VIx66m+eZF1NzVwFjRQqTZQOZ/xH/UYOHt6jQcCch9K o7HEk0kBmTupSLLlk7gyjuVtE9z/
X-Google-Smtp-Source: APXvYqwZLyjGr3E9mcrDGkwQbddRzV90/YlJ39uX6Gb8ZZvSSx8hleq/BpQzivFX0wKC1g5IiYyAxg==
X-Received: by 2002:a50:a3b1:: with SMTP id s46mr30305405edb.99.1554993902864; Thu, 11 Apr 2019 07:45:02 -0700 (PDT)
Received: from [10.255.0.170] (82.red-80-38-205.staticip.rima-tde.net. [80.38.205.82]) by smtp.googlemail.com with ESMTPSA id w3sm4455832edq.33.2019.04.11.07.45.01 for <rtcweb@ietf.org> (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 11 Apr 2019 07:45:01 -0700 (PDT)
To: rtcweb@ietf.org
References: <155497849785.12672.2988988646899076493.idtracker@ietfa.amsl.com> <a8795c0e-f506-7c6c-7941-2fe847eb472f@alvestrand.no>
From: Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com>
Message-ID: <e75a60b4-0c46-4fa6-e743-e5c9134f50ee@gmail.com>
Date: Thu, 11 Apr 2019 16:45:01 +0200
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1
MIME-Version: 1.0
In-Reply-To: <a8795c0e-f506-7c6c-7941-2fe847eb472f@alvestrand.no>
Content-Type: multipart/alternative; boundary="------------5F67EE26E71BF9CD44BF5712"
Content-Language: en-US
Archived-At: <https://mailarchive.ietf.org/arch/msg/rtcweb/Ig6CkCgjZV1Jdpfn_3mDb-D5Lrw>
Subject: Re: [rtcweb] Fwd: New Version Notification for draft-alvestrand-mmusic-simulcast-ssrc-00.txt
X-BeenThere: rtcweb@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Real-Time Communication in WEB-browsers working group list <rtcweb.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/rtcweb>, <mailto:rtcweb-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/rtcweb/>
List-Post: <mailto:rtcweb@ietf.org>
List-Help: <mailto:rtcweb-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/rtcweb>, <mailto:rtcweb-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 11 Apr 2019 14:45:08 -0000

Hi Harald,

Just one quick comment in case you find it useful.

I have been using this format for signaling both rids and ssrcs (and 
association between both):

a=simulcast:send c;b;a a=rid:c send ssrc=2564467881 a=rid:b send ssrc=1 
a=rid:a send ssrc=3 a=ssrc-group:FID 2564467881 32941417 
a=ssrc-group:FID 1 2 a=ssrc-group:FID 3 4 a=ssrc:2564467881 
cname:eRUkt2XxiSTlri77 a=ssrc:32941417 cname:eRUkt2XxiSTlri77 a=ssrc:1 
cname:eRUkt2XxiSTlri77 a=ssrc:2 cname:eRUkt2XxiSTlri77 a=ssrc:3 
cname:eRUkt2XxiSTlri77 a=ssrc:4 cname:eRUkt2XxiSTlri77

Note that the ssrc param (as a rid-param-other) in rid attribute is 
valid per the ABNF in:

https://tools.ietf.org/html/draft-ietf-mmusic-rid-15#page-19 
<https://tools.ietf.org/html/draft-ietf-mmusic-rid-15#page-18>

  rid-param = rid-width-param
                        / rid-height-param
                        / rid-fps-param
                        / rid-fs-param
                        / rid-br-param
                        / rid-pps-param
                        / rid-bpp-param
                        / rid-depend-param
                        / rid-param-other
  rid-param-other   = 1*(alpha-numeric / "-") [ "=" param-val ]
  param-val         = *( %x20-58 / %x60-7E ) ; Any printable character 
except semicolon


IMHO the usage of FID for signaling the "SIM" group is not a good choice 
as it is being used today for signaling the rtx association, and should 
be still present in the SDP if not using rids/rrids (which I understand 
that is the goal of the draft)

Best regards
Sergio

On 11/04/2019 12:30, Harald Alvestrand wrote:
>
> I have made a proposal.
>
> Note: This is strictly a *personal* contribution. Do not attach undue 
> authority to it.
>
>
> Harald
>
>
>
> -------- Forwarded Message --------
> Subject: 	New Version Notification for 
> draft-alvestrand-mmusic-simulcast-ssrc-00.txt
> Date: 	Thu, 11 Apr 2019 03:28:17 -0700
> From: 	internet-drafts@ietf.org
> To: 	Harald Alvestrand <harald@alvestrand.no>;
>
>
>
>
> A new version of I-D, draft-alvestrand-mmusic-simulcast-ssrc-00.txt
> has been successfully submitted by Harald Alvestrand and posted to the
> IETF repository.
>
> Name: draft-alvestrand-mmusic-simulcast-ssrc
> Revision: 00
> Title: Using SSRC with WebRTC Simulcast
> Document date: 2019-04-11
> Group: Individual Submission
> Pages: 6
> URL: 
> https://www.ietf.org/internet-drafts/draft-alvestrand-mmusic-simulcast-ssrc-00.txt
> Status: 
> https://datatracker.ietf.org/doc/draft-alvestrand-mmusic-simulcast-ssrc/
> Htmlized: 
> https://tools.ietf.org/html/draft-alvestrand-mmusic-simulcast-ssrc-00
> Htmlized: 
> https://datatracker.ietf.org/doc/html/draft-alvestrand-mmusic-simulcast-ssrc
>
>
> Abstract:
> This document describes a convention for sending "a=ssrc" attributes
> in SDP together with "a=simulcast" attributes. This allows SFUs that
> need SSRC information to have this info easily accessible.
>
> Given that it is intended as an interim measure, it does not aim for
> being published as an RFC.
>
>
>
> Please note that it may take a couple of minutes from the time of 
> submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> The IETF Secretariat
>
>
> _______________________________________________
> rtcweb mailing list
> rtcweb@ietf.org
> https://www.ietf.org/mailman/listinfo/rtcweb