draft-ietf-rtcweb-audio-04.txt   draft-ietf-rtcweb-audio-05.txt 
Network Working Group JM. Valin Network Working Group JM. Valin
Internet-Draft Mozilla Internet-Draft Mozilla
Intended status: Standards Track C. Bran Intended status: Standards Track C. Bran
Expires: July 31, 2014 Plantronics Expires: August 17, 2014 Plantronics
January 27, 2014 February 13, 2014
WebRTC Audio Codec and Processing Requirements WebRTC Audio Codec and Processing Requirements
draft-ietf-rtcweb-audio-04 draft-ietf-rtcweb-audio-05
Abstract Abstract
This document outlines the audio codec and processing requirements This document outlines the audio codec and processing requirements
for WebRTC client application and endpoint devices. for WebRTC client application and endpoint devices.
Status of This Memo Status of This Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on July 31, 2014. This Internet-Draft will expire on August 17, 2014.
Copyright Notice Copyright Notice
Copyright (c) 2014 IETF Trust and the persons identified as the Copyright (c) 2014 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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3. Codec Requirements 3. Codec Requirements
To ensure a baseline level of interoperability between WebRTC To ensure a baseline level of interoperability between WebRTC
clients, a minimum set of required codecs are specified below. If clients, a minimum set of required codecs are specified below. If
other suitable audio codecs are available for the browser to use, it other suitable audio codecs are available for the browser to use, it
is RECOMMENDED that they are also be included in the offer in order is RECOMMENDED that they are also be included in the offer in order
to maximize the possibility to establish the session without the need to maximize the possibility to establish the session without the need
for audio transcoding. for audio transcoding.
WebRTC clients are REQUIRED to implement the following audio codecs. WebRTC clients are REQUIRED to implement the following audio codecs:
o Opus [RFC6716], with the payload format specified in [Opus-RTP] o Opus [RFC6716] with the payload format specified in [Opus-RTP].
and any ptime value up to 120 ms
o G.711 PCMA and PCMU with one channel, a rate of 8000 Hz and any o G.711 PCMA and PCMU with the payload format specified in section
ptime value up to 120 ms - see section 4.5.14 of [RFC3551] 4.5.14 of [RFC3551].
o The audio/telephone-event media format as specified in [RFC4733]. o The audio/telephone-event media format as specified in [RFC4733].
WebRTC clients are REQUIRED to be able to generate and consume the WebRTC clients are REQUIRED to be able to generate and consume the
following events: following events:
+------------+--------------------------------+-----------+ +------------+--------------------------------+-----------+
|Event Code | Event Name | Reference | |Event Code | Event Name | Reference |
+------------+--------------------------------+-----------+ +------------+--------------------------------+-----------+
| 0 | DTMF digit "0" | RFC4733 | | 0 | DTMF digit "0" | RFC4733 |
| 1 | DTMF digit "1" | RFC4733 | | 1 | DTMF digit "1" | RFC4733 |
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