Re: [rtcweb] Clarification on simulcast and RID and RepairedRtpStreamId

Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com> Mon, 03 December 2018 21:22 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 29ACF12D4ED for <rtcweb@ietfa.amsl.com>; Mon, 3 Dec 2018 13:22:44 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2
X-Spam-Level:
X-Spam-Status: No, score=-2 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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-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 YAz-rHk_W_jE for <rtcweb@ietfa.amsl.com>; Mon, 3 Dec 2018 13:22:43 -0800 (PST)
Received: from mail-wm1-x329.google.com (mail-wm1-x329.google.com [IPv6:2a00:1450:4864:20::329]) (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 9D60512E043 for <rtcweb@ietf.org>; Mon, 3 Dec 2018 13:22:42 -0800 (PST)
Received: by mail-wm1-x329.google.com with SMTP id z18so7434884wmc.4 for <rtcweb@ietf.org>; Mon, 03 Dec 2018 13:22:42 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding:content-language; bh=Th3u7jvTqn4lFvFr+eVtX4Kh6KkR0qIVhhLR0qUK1IA=; b=bAQCd40B/AgQSjnW+1XaWl8SPIUK+YtZ0iHN7O0zO4/ELSeEcO91C/WuVcDiHP2cn5 Q2bbYoxuX1P2cckfh2eC4P1t6icRBgGAHxXMnZuoUz54KSXVc7ck02aYpRZ9zKt0aPEl oF5CDs8KncM/B9IO02RnE9NsEUy8vvzH442nNkKCS0q1ax/Io2mYxxHs+xwbJoYWATHd rwnYaGu8SD3ejqZmFWwqys+wDJMVFzT0LDIFpXUxf5RE/iyjs1gDTeY8vU8URZc0CUor x0EaOjavRb0SyU5Eao1Cz+nG3yGr8OR2FTIGTqCs0x7HlF9FYtcB0dZzjGohQFWhHUV/ itkg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=Th3u7jvTqn4lFvFr+eVtX4Kh6KkR0qIVhhLR0qUK1IA=; b=NWHgrKTZjOn4dLUwzM+y382nj4wVIsIG2MECtNx/k5mCROSBulfNkpwnqWcNkprV+m bINe8vhmjV7UbUxddqbogill1QzfZA7e+shajQvYap3oz/2GH/FSiXkvgGN/FNl+b1vR Q0A3Kxq3VHaq1/NgQeT7C5zh5dS7NcImE1v0bu+pp6ZnlRT+eiuvayWzyUbZaYhA2Q0t Sig/FcJG8PDNELH6ShPt26g5fQbnVhZgXmoonqJH6Nz/sApbdiZOfiGhGGFxXvhsRGw6 ICeE7kG+zoF57nymGGq/eiA2TmVsIsNYowgxRR//JymMUhjbIMAvyf4+RAC/Q6a0JPiy exJA==
X-Gm-Message-State: AA+aEWa/MC0EdIAZRhrgjs2qhCqPY4bsajqBjVFhVoUa3Fjb+RuvUiU5 n4EjW8S+ey5QH1BsadS5MnBBQ1fI
X-Google-Smtp-Source: AFSGD/UgZVmMvSGctg2SGukuBt0BaKKswpgbaZnb9XozFvz9rU7lNgAFdeRjvFIr8LGOXvt+GPv8eg==
X-Received: by 2002:a1c:f116:: with SMTP id p22mr9953090wmh.0.1543872160813; Mon, 03 Dec 2018 13:22:40 -0800 (PST)
Received: from [192.168.0.11] (89.141.9.215.dyn.user.ono.com. [89.141.9.215]) by smtp.googlemail.com with ESMTPSA id j33sm28313552wre.91.2018.12.03.13.22.39 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 03 Dec 2018 13:22:40 -0800 (PST)
To: Iñaki Baz Castillo <ibc@aliax.net>
Cc: Magnus Westerlund <magnus.westerlund@ericsson.com>, rtcweb@ietf.org
References: <CALiegfm=++8o=Ou1Tgu6bxyiVdw2ysgM5HnjRqi2hJBoy476yg@mail.gmail.com> <AM0PR07MB4979C0EC8765FA2DF70E613395AE0@AM0PR07MB4979.eurprd07.prod.outlook.com> <45beb8d6-6578-dc98-4ff7-1be7a55c0687@gmail.com> <AM0PR07MB4979571D1B2933258A18544A95AE0@AM0PR07MB4979.eurprd07.prod.outlook.com> <13ff90af-d62e-2f47-3ccc-16ca4e9e3cac@gmail.com> <CALiegfnh-_mMXpmwWnjjX=iayN0WaveHZOHuMrXk9=Tfgx2Z+Q@mail.gmail.com>
From: Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com>
Message-ID: <2613a4ff-0855-4f78-d3f0-9f9aaaf9ecdb@gmail.com>
Date: Mon, 03 Dec 2018 22:26:22 +0100
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.3.2
MIME-Version: 1.0
In-Reply-To: <CALiegfnh-_mMXpmwWnjjX=iayN0WaveHZOHuMrXk9=Tfgx2Z+Q@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"; format="flowed"
Content-Transfer-Encoding: 8bit
Content-Language: en-US
Archived-At: <https://mailarchive.ietf.org/arch/msg/rtcweb/PLmIhwyrM-C9SXNAmFYVOEGTQy8>
Subject: Re: [rtcweb] Clarification on simulcast and RID and RepairedRtpStreamId
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: Mon, 03 Dec 2018 21:22:44 -0000

On 03/12/2018 22:05, Iñaki Baz Castillo wrote:
> On Mon, 3 Dec 2018 at 14:32, Sergio Garcia Murillo
> <sergio.garcia.murillo@gmail.com> wrote:
>> Given than rid is not globally unique but unique per mid, the rtx packet
>> would need to include the mid anyway, wouldn't rid be redundant for
>> non-simulcast use case?
> All the streams (ssrcs) belonging to the same "source" and
> "transceiver" should have the same MID.
> MID should be used as the first demux mechanism to identify the
> "source" or "transceiver".
> Then inspect RID, ssrc and PT to match the exact media/RTX/FLEXFEC stream.
>
My point is that there is a single source in the transceiver/MID why 
should we add default RID and waste 2 more bytes in each media and rtx 
packet?


Best regards

Sergio