[Bug 13625] New: There is no way to pass audio and video content metadata to the user agent that is required in some cases for playback.


           Summary: There is no way to pass audio and video content
                    metadata to the user agent that is required in some
                    cases for playback.
           Product: HTML WG
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: HTML5 spec (editor: Ian Hickson)
        AssignedTo: ian@hixie.ch
        ReportedBy: b.lund@cablelabs.com
         QAContact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-wg-issue-tracking@w3.org,

Problem description:

Commercial video providers want to use an HTML5 user agent to provide user
interface for media playback on devices that also support the UPnP home
networking protocol [1]. In this use case, home network content is stored in a
content directory where each item in the content directory contains the URL of
the content item along with content metadata. This metadata is called resource
encoding characteristics properties [2]. Some of this data may be needed by the
user agent for content playback, specifically:

o protocolInfo - third and fourth fields [3] contain content type information
o size - provides a hint of the content item size in the case of file based
o protection  contains additional information for content protection

There is currently no way to represent this type of metadata in the video and
audio element so it is available to the user agent. These metadata items may be
relevant to types of content other than UPnP.

Proposed solution:

To address the above problem, it is proposed that three new attributes be added
to the HTMLMediaElement for this metadata, e.g. contentInfo, size and

[1] http://upnp.org/specs/arch/UPnP-arch-DeviceArchitecture-v1.0.pdf, also
ISO/IEC 29341-1:2008
[2] http://upnp.org/specs/av/UPnP-av-ContentDirectory-v4-Service.pdf, also
ISO/IEC 29341-3-12:2008
[3] http://upnp.org/specs/av/UPnP-av-ConnectionManager-v3-Service.pdf, also
ISO/IEC 29341-3-11:2008 section 2.5.2

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Received on Wednesday, 3 August 2011 19:39:02 UTC