[rtcweb] Comments on draft-ietf-rtcweb-audio-03
Magnus Westerlund <magnus.westerlund@ericsson.com> Wed, 22 January 2014 15:29 UTC
Return-Path: <magnus.westerlund@ericsson.com>
X-Original-To: rtcweb@ietfa.amsl.com
Delivered-To: rtcweb@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E28921A013E for <rtcweb@ietfa.amsl.com>; Wed, 22 Jan 2014 07:29:02 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.24
X-Spam-Level:
X-Spam-Status: No, score=-1.24 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HELO_EQ_SE=0.35, HOST_MISMATCH_NET=0.311, SPF_PASS=-0.001] autolearn=no
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 GBKApUlBx93N for <rtcweb@ietfa.amsl.com>; Wed, 22 Jan 2014 07:29:01 -0800 (PST)
Received: from sessmg20.mgmt.ericsson.se (sessmg20.ericsson.net [193.180.251.50]) by ietfa.amsl.com (Postfix) with ESMTP id 66AB01A0136 for <rtcweb@ietf.org>; Wed, 22 Jan 2014 07:29:00 -0800 (PST)
X-AuditID: c1b4fb32-b7f4c8e0000012f5-d6-52dfe3ba87dc
Received: from ESESSHC023.ericsson.se (Unknown_Domain [153.88.253.124]) by sessmg20.mgmt.ericsson.se (Symantec Mail Security) with SMTP id 22.28.04853.AB3EFD25; Wed, 22 Jan 2014 16:28:58 +0100 (CET)
Received: from [127.0.0.1] (153.88.183.153) by smtp.internal.ericsson.com (153.88.183.89) with Microsoft SMTP Server id 14.2.347.0; Wed, 22 Jan 2014 16:28:58 +0100
Message-ID: <52DFE3B9.2050402@ericsson.com>
Date: Wed, 22 Jan 2014 16:28:57 +0100
From: Magnus Westerlund <magnus.westerlund@ericsson.com>
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:24.0) Gecko/20100101 Thunderbird/24.2.0
MIME-Version: 1.0
To: "rtcweb@ietf.org" <rtcweb@ietf.org>, draft-ietf-rtcweb-audio@tools.ietf.org
X-Enigmail-Version: 1.6
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 8bit
X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrLJMWRmVeSWpSXmKPExsUyM+Jvje7ux/eDDFYLWrTOWsFusfZfO7sD k8eSJT+ZPL5c/swWwBTFZZOSmpNZllqkb5fAlXG17Sp7wSuxigkzNjM2MK4U6mLk5JAQMJG4 u2AyE4QtJnHh3nq2LkYuDiGBE4wSz998Y4FwljNKNGy7wgJSxSugLTH192OwDhYBVYmfD46A xdkELCRu/mhkA7FFBYIlbk17wA5RLyhxcuYTsBoRoPiGPR1gcWEBfYkJuz8C1XMAbRaX6GkM AgkzC+hJTLnawghhy0s0b53NDGILAa1taOpgncDIPwvJ1FlIWmYhaVnAyLyKUbI4tbg4N93I QC83PbdEL7UoM7m4OD9Przh1EyMwCA9u+W20g/HkHvtDjNIcLErivNdZa4KEBNITS1KzU1ML Uovii0pzUosPMTJxcEo1MMZ1lO0/4XtNfvWpoAXPrMRZM9eIfBfLvfHcaMbsjPUsWhuX9XM7 XXubbn1j+WqpiCi/03IspzdutSlOrW7sfHY9+sWW1ddSOQ680T7M3sflnxm1tu7uNpHOIu4d Plyu/v1zFv0qeijXM+2WR4n8lXcbMqXWh4YsWv7y6jMFYSFJIaZDCmlL5yqxFGckGmoxFxUn AgCZiM5CEAIAAA==
Subject: [rtcweb] Comments on draft-ietf-rtcweb-audio-03
X-BeenThere: rtcweb@ietf.org
X-Mailman-Version: 2.1.15
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: Wed, 22 Jan 2014 15:29:03 -0000
WG and Authors, (As Individual) I have reviewed this draft and have some comments. 1. Section 3: o G.711 PCMA and PCMU with one channel, a rate of 8000 Hz and a ptime of 20 - see section 4.5.14 of [RFC3551] Especially in regards to amount of data packetized in each RTP payload this is fairly narrow definition. Wouldn't the interoperability gain to at least require wider receiver capabilities? 2. Section 3: o Telephone Event - [RFC4733] Maybe one should be more explicit about which RTP payload format one is expected to support. As RFC 4733 contains two. Do I assume correctly that only audio/telephone-event is to be supported? In addition considering that this payload format can carry any of the events listed in the event registry: http://www.iana.org/assignments/audio-telephone-event-registry/audio-telephone-event-registry.xhtml#audio-telephone-event-registry-1 I think the events that an endpoint shall be capable of generating and consume needs to be explicitly listed. 3. Section 4: AUTHORS' NOTE: The idea of using the same level as what the ITU-T recommends is that it should improve inter-operability while at the same time maintaining sufficient dynamic range and reducing the risk of clipping. The main drawbacks are that the resulting level is about 12 dB lower than typical "commercial music" levels and it leaves room for ill-behaved clients to be much louder than a normal client. While using music-type levels is not really an option (it would require using the same compressor-limitors that studios use), it would be possible to have a level slightly higher (e.g. 3 dB) than what is recommended above without causing interoperability problems. The WG needs to resolve this Author's note before we can go to WG last call. I would hope that we would be able to go to WG last call after the next update. Thus, anyone have feedback on this? If no one have input, I would suggest that we remove the note and leave the recommendation as it is. 4. Section 8. Can you please be more specific to what is relevant for this document in regards to the security considerations. I assume confidentiality, source authentication are the two main issues. Anything else that needs to be included? 5. Section 10. [I-D.ekr-security-considerations-for-rtc-web] needs to be updated to the latest version. Cheers Magnus Westerlund ---------------------------------------------------------------------- Services, Media and Network features, Ericsson Research EAB/TXM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com ----------------------------------------------------------------------
- Re: [rtcweb] Comments on draft-ietf-rtcweb-audio-… Jean-Marc Valin
- [rtcweb] Comments on draft-ietf-rtcweb-audio-03 Magnus Westerlund