Re: [MMUSIC] "a=extmap" with BUNDLE

Iñaki Baz Castillo <ibc@aliax.net> Mon, 27 March 2017 21:00 UTC

Return-Path: <ibc@aliax.net>
X-Original-To: mmusic@ietfa.amsl.com
Delivered-To: mmusic@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EB567120727 for <mmusic@ietfa.amsl.com>; Mon, 27 Mar 2017 14:00:56 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.899
X-Spam-Level:
X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=aliax-net.20150623.gappssmtp.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 8sCFuxFoiWNh for <mmusic@ietfa.amsl.com>; Mon, 27 Mar 2017 14:00:55 -0700 (PDT)
Received: from mail-wr0-x231.google.com (mail-wr0-x231.google.com [IPv6:2a00:1450:400c:c0c::231]) (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 5154B1279EB for <mmusic@ietf.org>; Mon, 27 Mar 2017 14:00:55 -0700 (PDT)
Received: by mail-wr0-x231.google.com with SMTP id u1so75570428wra.2 for <mmusic@ietf.org>; Mon, 27 Mar 2017 14:00:55 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=aliax-net.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=9gmnJAZnH9wmT0X/u3qOizb5/PaWcGu/39hvqgxzfGk=; b=sSwAjMDKzPeve9PiEc009lax1YiI06JQ58vRnTUCys0HTsPp2q3itQEMpK+6ux376D A2rpGi9Xq3nE6wUMSovb/S904un9/cZSQ6FdLhoTI1t1SrBsxo1GkD7a9EZ8ULI039hU FgS9c+HsUM4CZ5q5d/kQ8+4Vx4/OfxdXg5RMojhYJXSn9wTyKWPGcCQY4CElVfeKwVA+ bY5yigYudFt/rjuhPKOKi3F4SQGoCbrEYr4ouS4oDtuY5oXwqd1qiPIxoCdbNIfph/Pz nIV3j05SRu2xl1P4q/aZI2D30hAH/gGJmKB0CVwf+WM8AflIGLF2wVEeGkzjQrqtcPgr Kbow==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=9gmnJAZnH9wmT0X/u3qOizb5/PaWcGu/39hvqgxzfGk=; b=FK9ehXMYu+WPe+JPtdM0B0jtjDJDrlO53xFo2ypjTWvJL78+oXjW+Ds4isgvuL2FdC eDgBmfIbRxoWy+4OUVbkR4xhNSEuDFX0obDuzuAyxizjSq8jeos/XSxlVAzyrYJl5VYO LfVks+l3ij0nnqdwyxkTeCVZAS2UjvmthlNS2iASS3R3XJVk0aKhH/ir9GXtUgtbroxs zneL3tBCbQIwsdEapZsJDq7vunV8o/MUWNhZlvIrFHXQ8frE5scpocY977jKzYU1YYIW +VbldXLT0bIqzKyuGyVtjxqjobtYBmaqOfg8vxvwv2pWdv9nr2G5WTpFHT+rN6Vov371 +VXg==
X-Gm-Message-State: AFeK/H13+xxQVAoXsBzexDZNCQQRNYD0IcbBGyi5RieXrAiOWF4BYT3jf0T2HDRs3TAqTcEq68N2qGCouWxSsA==
X-Received: by 10.223.172.135 with SMTP id o7mr20392474wrc.121.1490648453850; Mon, 27 Mar 2017 14:00:53 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.80.138.222 with HTTP; Mon, 27 Mar 2017 14:00:33 -0700 (PDT)
In-Reply-To: <279829dc-201f-25ab-0d1b-9958fb98682f@gmail.com>
References: <CAK35n0YEA8Cu_v33QsTHXRx70Jw6r-gYT_4rSjYvb6KR+YD81Q@mail.gmail.com> <CAMRcRGTJoOE0HLGwkdW261SiM+J3BCoAiDeq919d+YkyfhU6eg@mail.gmail.com> <CAK35n0ZMX6XVicnuvxHH16ADW5on0n18yK8_VDTLX7B1Gb0XDA@mail.gmail.com> <CALiegfmDH4a8nM08ify77pcz+az38KbJ3=x1n-dso7SYoODD1A@mail.gmail.com> <CAK35n0beszOvayncKgyC=JLZ+7ST_MW4awZ-VSMYt4qvNefX7A@mail.gmail.com> <279829dc-201f-25ab-0d1b-9958fb98682f@gmail.com>
From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= <ibc@aliax.net>
Date: Mon, 27 Mar 2017 23:00:33 +0200
Message-ID: <CALiegfm33QGSuWDvJED5ERGEvHaJ6890X6hyqnjHr-ZkRCFSUg@mail.gmail.com>
To: Byron Campen <docfaraday@gmail.com>
Cc: Taylor Brandstetter <deadbeef@google.com>, mmusic WG <mmusic@ietf.org>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
Archived-At: <https://mailarchive.ietf.org/arch/msg/mmusic/d47cyfvIdfe-ZZ6pAObb0piAJDo>
Subject: Re: [MMUSIC] "a=extmap" with BUNDLE
X-BeenThere: mmusic@ietf.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: Multiparty Multimedia Session Control Working Group <mmusic.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/mmusic>, <mailto:mmusic-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/mmusic/>
List-Post: <mailto:mmusic@ietf.org>
List-Help: <mailto:mmusic-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/mmusic>, <mailto:mmusic-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 27 Mar 2017 21:00:57 -0000

2017-03-27 19:55 GMT+02:00 Byron Campen <docfaraday@gmail.com>om>:
>   Would it not be sufficient to specify that bundled m-sections not use the
> same identifier for _different_ extensions? There's no ambiguity if you use
> '3' for mid on every m-section, which is the kind of thing implementations
> do now anyway.

Still one may use '3' for MID within a m=audio line and '4' for MID
within a m=video line. And that's legal.
Anyhow, current browsers use unique IDs across the whole SDP.


-- 
Iñaki Baz Castillo
<ibc@aliax.net>