RTCWEB D. Burnett
Internet-Draft Voxeo
Intended status: Standards Track October 21, 2013
Expires: April 24, 2014
IANA Registry for RTCWeb Constrainable Properties
draft-burnett-rtcweb-constraints-registry-04
Abstract
Specifications in W3C's Media Capture Task Force and WebRTC Working
Group have need of a registry in which to maintain a list of
constrainable properties for HTML media and other constrainable
objects. This document defines this registry.
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Burnett Expires April 24, 2014 [Page 1]Internet-Draft constraints-registry October 2013Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 2
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 2
3.1. RTCWeb Media Constraints . . . . . . . . . . . . . . . . 3
3.1.1. Designated Expert Instructions . . . . . . . . . . . 3
4. Security Considerations . . . . . . . . . . . . . . . . . . . 4
5. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
5.1. Normative References . . . . . . . . . . . . . . . . . . 4
5.2. Informative References . . . . . . . . . . . . . . . . . 4
Appendix A. Acknowledgements . . . . . . . . . . . . . . . . . . 5
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
There are two W3C specifications that have need of a registry in
which to represent constrainable properties: Media Capture and
Streams [W3C.WD-mediacapture-streams-20130903] and WebRTC 1.0: Real-
time Communication Between Browsers [W3C.WD-webrtc-20130910]. In the
former, the getUserMedia() method on the NavigatorUserMedia interface
takes a "constraints" argument. In the latter, the addStream()
method on the RTCPeerConnection interface and the constructor for
RTCPeerConnection both take optional "constraints" parameters. All
three of these parameters make use of a data structure representing a
list of constraints on the HTML media or media connection to be
established. Additionally, both specifications define methods that
are used to query the web browser about its capabilities. The
returned data structure specifies the browser's capabilities in terms
of constraints that it can satisfy. The data structures and their
use are defined in the aforementioned specifications. This document
specifies the registry used to define individual constrainable
property names, their allowed values, and their meanings.
2. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
3. IANA Considerations
This document defines a registry "RTCWeb Constrainable Properties"
for use by W3C specifications needing to indicate constrainable
properties on HTML Media and other constrainable objects, both as
datatracker.ietf.org