Re: [rtcweb] Signalling, SDP, and the way we think about interconnecting RTCWEB applications
Wolfgang <wolfgang.beck01@googlemail.com> Mon, 17 October 2011 06:14 UTC
Return-Path: <wolfgang.beck01@googlemail.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 7249D21F8AF6 for <rtcweb@ietfa.amsl.com>; Sun, 16 Oct 2011 23:14:28 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.977
X-Spam-Level:
X-Spam-Status: No, score=-2.977 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id m-Mq7jQGW5T1 for <rtcweb@ietfa.amsl.com>; Sun, 16 Oct 2011 23:14:27 -0700 (PDT)
Received: from mail-pz0-f50.google.com (mail-pz0-f50.google.com [209.85.210.50]) by ietfa.amsl.com (Postfix) with ESMTP id 9786621F85D1 for <rtcweb@ietf.org>; Sun, 16 Oct 2011 23:14:27 -0700 (PDT)
Received: by pzk34 with SMTP id 34so5952416pzk.9 for <rtcweb@ietf.org>; Sun, 16 Oct 2011 23:14:27 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=tW5UTCZg8pmweoS8fi4u4Qrmm9BMoBzV3WONGhOf0QE=; b=l8UfcJ6uBxQ4ukfuXT4rKJ3XHsDZMunwrNYGiao6I+Fp3zA6UTZT9yeFHcy0p5HqM+ ZAXUmTksvz67tzt0YI4M4rTbDgIxx/UXPpOem3eoui9uA/TlmB6LAoZHeIuFVvqtx5Cz x6BafauoAoaGucWfZJn1q4xqzUfhDGh2qGUAM=
MIME-Version: 1.0
Received: by 10.68.0.5 with SMTP id 5mr36498747pba.118.1318832065764; Sun, 16 Oct 2011 23:14:25 -0700 (PDT)
Received: by 10.68.55.230 with HTTP; Sun, 16 Oct 2011 23:14:25 -0700 (PDT)
In-Reply-To: <4E9BA235.3010808@jesup.org>
References: <AAE428925197FE46A5F94ED6643478FEA925614C6A@HE111644.EMEA1.CDS.T-INTERNAL.COM> <ABB0E87F-DEEF-4386-A718-D48E00F5961A@acmepacket.com> <CALiegfnHuYJnX3rnuDGbZPB4NvK=dCTJ=iLcu+zguP5wo_uPqQ@mail.gmail.com> <92A553E5-107A-4987-A5F5-1F56FB5A7800@acmepacket.com> <CALiegfn6nv1D2HjeMo-jPDh9Acph7JdH1DT1xZXUtHqzqxya3Q@mail.gmail.com> <CA+9kkMB3p1u7hRX_vO1bQbQ2z-V+0rLiJmi+ZqkEA0mqc66keQ@mail.gmail.com> <CALiegf=26_6r_YjBCmO+6_GnrAzi=KcLoPFqUi-y1E8m_gWreQ@mail.gmail.com> <CA+9kkMDsWyKdvXSRMV0OGEeEYbSENFHSOovNJDUGK30N_pGrnQ@mail.gmail.com> <CABRok6nsVH5tYfwFqQpmjF=Kj-wZQDB9XUX8oOee8r3wr51fKA@mail.gmail.com> <CAAJUQMg79h1=V4m9agq9CcEmFknTaaXrgUz9qtq9EL-0_nChiQ@mail.gmail.com> <4E996E80.6070500@alvestrand.no> <CABRok6k=8wa_K7X+MHwaii+6ANfTquLqauMKgm7KP82wf6pKyA@mail.gmail.com> <8486C8728176924BAF5BDB2F7D7EEDDF3E0906A2@ucolhp4d.easf.csd.disa.mil> <CAAJUQMjsRu=eQic002-T-V0rK=1ByRUD8vV2_+C3Q-cHf-ZL4g@mail.gmail.com> <CAAJUQMiV0-w7QBpWk1dc+BprM0T1MiKt-yuH7V9YyZ=vwD=z7Q@mail.gmail.com> <4E9BA235.3010808@jesup.org>
Date: Mon, 17 Oct 2011 08:14:25 +0200
Message-ID: <CAAJUQMjx3KnAqqFbEzzKBw_QMa48+yokQ8U4wemMGGVQhOepCg@mail.gmail.com>
From: Wolfgang <wolfgang.beck01@googlemail.com>
To: Randell Jesup <randell-ietf@jesup.org>
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: quoted-printable
Cc: rtcweb@ietf.org
Subject: Re: [rtcweb] Signalling, SDP, and the way we think about interconnecting RTCWEB applications
X-BeenThere: rtcweb@ietf.org
X-Mailman-Version: 2.1.12
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: <http://www.ietf.org/mail-archive/web/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, 17 Oct 2011 06:14:28 -0000
On Mon, Oct 17, 2011 at 5:34 AM, Randell Jesup <randell-ietf@jesup.org> wrote: > On 10/16/2011 4:39 AM, Wolfgang wrote: >> So why do we transport some codec parameters outside the media stream >> at all? The called device might need information about the media >> stream before establishing it. > > Exactly, and the media stream is unreliable. This is the purpose of > sprop-parameter-sets in H.264 SDP. Also think of gatewaying rtcweb to SDP. > >> The server might need access to codec parameters to forward the call >> to the best destination: imagine a user with two RTCWEB clients, one >> only supports only low resolution video, the other one full HD. A high >> resolution video call comes in. How should the server select the >> called client if it doesn't have access to the media stream which >> carries the resolution parameters? > > I'm not certain how "the server" would select the client in your scenario > under any usage; how would the server know before forwarding the call which > client supported the incoming call's parameters? That's a valid point. So you think Radhika's proposal to only negotiate codec types but not codec parameters in the signaling path would cover all realistic use cases? >> In my model the server would know what type of call was set up as it >> always controls both ends of the call. If some other application >> controls the calling party, you need some standardized protocol like >> SDP. > > So the server negotiates the parameters? I'm not sure what "my model" means > here (and I reviewed earlier messages from you here). I didn't have company email access during the weekend and I'm the author of https://datatracker.ietf.org/doc/draft-beck-rtcweb-alt-ic/. The idea is to always use only one RTCWEB server and authenticate/authorize unknown users by 3rd party authentication. Like commenting on a blog using OpenID. Wolfgang Beck > > > -- > Randell Jesup > randell-ietf@jesup.org > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb >
- Re: [rtcweb] Signalling, SDP, and the way we thin… Iñaki Baz Castillo
- [rtcweb] Signalling, SDP, and the way we think ab… BeckW
- Re: [rtcweb] Signalling, SDP, and the way we thin… Iñaki Baz Castillo
- Re: [rtcweb] Signalling, SDP, and the way we thin… Randell Jesup
- Re: [rtcweb] Signalling, SDP, and the way we thin… Hadriel Kaplan
- Re: [rtcweb] Signalling, SDP, and the way we thin… Iñaki Baz Castillo
- Re: [rtcweb] Signalling, SDP, and the way we thin… Hadriel Kaplan
- Re: [rtcweb] Signalling, SDP, and the way we thin… Iñaki Baz Castillo
- Re: [rtcweb] Signalling, SDP, and the way we thin… Ted Hardie
- Re: [rtcweb] Signalling, SDP, and the way we thin… Iñaki Baz Castillo
- Re: [rtcweb] Signalling, SDP, and the way we thin… Hadriel Kaplan
- Re: [rtcweb] Signalling, SDP, and the way we thin… Ted Hardie
- Re: [rtcweb] Signalling, SDP, and the way we thin… Dzonatas Sol
- Re: [rtcweb] Signalling, SDP, and the way we thin… Iñaki Baz Castillo
- Re: [rtcweb] Signalling, SDP, and the way we thin… Iñaki Baz Castillo
- Re: [rtcweb] Signalling, SDP, and the way we thin… Neil Stratford
- Re: [rtcweb] Signalling, SDP, and the way we thin… Wolfgang
- Re: [rtcweb] Signalling, SDP, and the way we thin… Harald Alvestrand
- Re: [rtcweb] Signalling, SDP, and the way we thin… Neil Stratford
- Re: [rtcweb] Signalling, SDP, and the way we thin… Wolfgang
- Re: [rtcweb] Signalling, SDP, and the way we thin… Harald Alvestrand
- Re: [rtcweb] Signalling, SDP, and the way we thin… Neil Stratford
- Re: [rtcweb] Signalling, SDP, and the way we thin… Roy, Radhika R USA CIV (US)
- Re: [rtcweb] Signalling, SDP, and the way we thin… Stephan Wenger
- [rtcweb] VP8 and parameters (Re: Signalling, SDP,… Harald Alvestrand
- Re: [rtcweb] Signalling, SDP, and the way we thin… Wolfgang
- Re: [rtcweb] Signalling, SDP, and the way we thin… Dzonatas Sol
- Re: [rtcweb] Signalling, SDP, and the way we thin… Randell Jesup
- Re: [rtcweb] Signalling, SDP, and the way we thin… Wolfgang
- Re: [rtcweb] Signalling, SDP, and the way we thin… Randell Jesup
- Re: [rtcweb] Signalling, SDP, and the way we thin… Wolfgang Beck
- Re: [rtcweb] Signalling, SDP, and the way we thin… Iñaki Baz Castillo
- Re: [rtcweb] Signalling, SDP, and the way we thin… Ted Hardie
- Re: [rtcweb] Signalling, SDP, and the way we thin… Dzonatas Sol
- Re: [rtcweb] Signalling, SDP, and the way we thin… Randell Jesup
- Re: [rtcweb] Signalling, SDP, and the way we thin… Wolfgang Beck
- Re: [rtcweb] Signalling, SDP, and the way we thin… Cullen Jennings