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2009/dap/camera/WD2-html-media-capture Overview.html,NONE,1.1

From: Robin Berjon via cvs-syncmail <cvsmail@w3.org>
Date: Wed, 13 Apr 2011 14:45:18 +0000
To: public-dap-commits@w3.org
Message-Id: <E1QA1Jm-0003Cs-UQ@lionel-hutz.w3.org>
Update of /sources/public/2009/dap/camera/WD2-html-media-capture
In directory hutz:/tmp/cvs-serv12305/WD2-html-media-capture

Added Files:
	Overview.html 
Log Message:
WD2 first pass

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</style><link charset="utf-8" type="text/css" rel="stylesheet" href="http://www.w3.org/StyleSheets/TR/W3C-WD"></head>
  <body style="display: inherit;"><div class="head"><p><a href="http://www.w3.org/"><img src="http://www.w3.org/Icons/w3c_home" alt="W3C" height="48" width="72"></a></p><h1 class="title" id="title">HTML Media Capture</h1><h2 id="w3c-working-draft-14-april-2011">W3C Working Draft 14 April 2011</h2><dl><dt>This version:</dt><dd><a href="http://www.w3.org/TR/2011/WD-html-media-capture-20110414/">http://www.w3.org/TR/2011/WD-html-media-capture-20110414/</a></dd><dt>Latest published version:</dt><dd><a href="http://www.w3.org/TR/html-media-capture/">http://www.w3.org/TR/html-media-capture/</a></dd><dt>Latest editor's draft:</dt><dd><a href="http://dev.w3.org/2009/dap/camera/">http://dev.w3.org/2009/dap/camera/</a></dd><dt>Previous version:</dt><dd><a href="http://www.w3.org/TR/2010/WD-html-media-capture-20100928/">http://www.w3.org/TR/2010/WD-html-media-capture-20100928/</a></dd><dt>Editors:</dt><dd><span>Ilkka Oksanen</span>, Nokia</dd>
<dd><span>Dominique Hazaël-Massieux</span>, W3C</dd>
</dl><p class="copyright"><a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> © 2011 <a href="http://www.w3.org/"><acronym title="World Wide Web Consortium">W3C</acronym></a><sup>®</sup> (<a href="http://www.csail.mit.edu/"><acronym title="Massachusetts Institute of Technology">MIT</acronym></a>, <a href="http://www.ercim.eu/"><acronym title="European Research Consortium for Informatics and Mathematics">ERCIM</acronym></a>, <a href="http://www.keio.ac.jp/">Keio</a>), All Rights Reserved. W3C <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>, <a href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and <a href="http://www.w3.org/Consortium/Legal/copyright-documents">document use</a> rules apply.</p><hr></div>
  
    <div class="introductory section" id="abstract"><h2>Abstract</h2>
      This specification defines HTML form enhancements that provide access to the audio, image and video capture
      capabilities of the device.  
    </div><div id="sotd" class="introductory section"><h2>Status of This Document</h2><p><em>This section describes the status of this document at the time of its publication. Other documents may supersede this document. A list of current W3C publications and the latest revision of this technical report can be found in the <a href="http://www.w3.org/TR/">W3C technical reports index</a> at http://www.w3.org/TR/.</em></p>
<p>This document is a the first part of the split of the <a href="http://www.w3.org/TR/2010/WD-capture-api-20100401/">previous version</a>
of this document, focused on the integration of media capture in HTML
forms based on an extension to the <a href="http://www.w3.org/TR/FileAPI/">FileAPI</a>. The second part of the split focused on programmatic access to the capture devices will be published separately.</p>

<p>The Working Group is looking for feedback on the general approach of
this new version, and will coordinate with the HTML and Web Applications
Working Group to ensure the proper progress of this document.</p>

<p>Issues and editors notes in the document highlight some of the points on
which the group is still working and would particularly like to get
feedback.</p>
    <p>This document was published by the <a href="http://www.w3.org/2009/dap/">Device APIs and Policy Working Group</a> as a Working Draft. This document is intended to become a W3C Recommendation. If you wish to make comments regarding this document, please send them to <a href="mailto:public-device-apis@w3.org">public-device-apis@w3.org</a> (<a href="mailto:public-device-apis-request@w3.org?subject=subscribe">subscribe</a>, <a href="http://lists.w3.org/Archives/Public/public-device-apis/">archives</a>). All feedback is welcome.</p><p>Publication as a Working Draft does not imply endorsement by the W3C Membership. This is a draft document and may be updated, replaced or obsoleted by other documents at any time. It is inappropriate to cite this document as other than work in progress.</p><p>This document was produced by a group operating under the <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004 W3C Patent Policy</a>. W3C maintains a <a href="http://www.w3.org/2004/01/pp-impl/43696/status" rel="disclosure">public list of any patent disclosures</a> made in connection with the deliverables of the group; that page also includes instructions for disclosing a patent. An individual who has actual knowledge of a patent which the individual believes contains <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential Claim(s)</a> must disclose the information in accordance with <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section 6 of the W3C Patent Policy</a>.</p></div><div class="section" id="toc"><h2 class="introductory">Table of Contents</h2><ul class="toc"><li class="tocline"><a class="tocxref" href="#introduction"><span class="secno">1. </span>Introduction</a></li><li class="tocline"><a class="tocxref" href="#conformance"><span class="secno">2. </span>Conformance</a></li><li class="tocline"><a class="tocxref" href="#security"><span class="secno">3. </span>Security and Privacy Considerations</a></li><li class="tocline"><a class="tocxref" href="#formaccess"><span class="secno">4. </span>Capture aware file-select control</a></li><li class="tocline"><a class="tocxref" href="#captureparam"><span class="secno">5. </span>The <code>capture</code> attribute</a><ul class="toc"><li class="tocline"><a class="tocxref" href="#attributes"><span class="secno">5.1 </span>Attributes</a></li></ul></li><li class="tocline"><a class="tocxref" href="#api"><span class="secno">6. </span>WebIDL interfaces</a><ul class="toc"><li class="tocline"><a class="tocxref" href="#jsexample"><span class="secno">6.1 </span>Example</a></li><li class="tocline"><a class="tocxref" href="#formatdata"><span class="secno">6.2 </span><span class="idlType formerLink idlType"><code>MediaFileData</code></span> interface</a><ul class="toc"><li class="tocline"><a class="tocxref" href="#attributes-1"><span class="secno">6.2.1 </span>Attributes</a></li></ul></li><li class="tocline"><a class="tocxref" href="#mediafile"><span class="secno">6.3 </span><span class="idlType formerLink idlType"><code>MediaFile</code></span> interface</a><ul class="toc"><li class="tocline"><a class="tocxref" href="#methods"><span class="secno">6.3.1 </span>Methods</a></li></ul></li><li class="tocline"><a class="tocxref" href="#mediafiledatasuccesscallback"><span class="secno">6.4 </span><span class="idlType formerLink idlType"><code>MediaFileDataSuccessCallback</code></span> interface</a><ul class="toc"><li class="tocline"><a class="tocxref" href="#methods-1"><span class="secno">6.4.1 </span>Methods</a></li></ul></li><li class="tocline"><a class="tocxref" href="#mediafiledataerrorcallback"><span class="secno">6.5 </span><span class="idlType formerLink idlType"><code>MediaFileDataErrorCallback</code></span> interface</a><ul class="toc"><li class="tocline"><a class="tocxref" href="#methods-2"><span class="secno">6.5.1 </span>Methods</a></li></ul></li><li class="tocline"><a class="tocxref" href="#mediafiledataerror"><span class="secno">6.6 </span><span class="idlType formerLink idlType"><code>MediaFileDataError</code></span> interface</a><ul class="toc"><li class="tocline"><a class="tocxref" href="#attributes-2"><span class="secno">6.6.1 </span>Attributes</a></li><li class="tocline"><a class="tocxref" href="#constants"><span class="secno">6.6.2 </span>Constants</a></li></ul></li></ul></li><li class="tocline"><a class="tocxref" href="#uiexamples"><span class="secno">A. </span>User Interface Examples</a></li><li class="tocline"><a class="tocxref" href="#references"><span class="secno">B. </span>References</a><ul class="toc"><li class="tocline"><a class="tocxref" href="#normative-references"><span class="secno">B.1 </span>Normative references</a></li><li class="tocline"><a class="tocxref" href="#informative-references"><span class="secno">B.2 </span>Informative references</a></li></ul></li></ul></div>

    

    <div class="section" id="introduction">
    <!--OddPage--><h2><span class="secno">1. </span>Introduction</h2>

    <p>The HTML Form Based Media Capturing specification defines a new
    interface for media files, a new parameter for the accept attribute of the HTML input element in file upload state, and recommendations for
    providing optimized access to the microphone and camera of a
    hosting device.</p> 

    <p>Providing streaming access to these capabilities is outside of the scope of this specification.</p>
    <p class="note">The Working Group is investigating the opportunity to specify streaming access via the <a href="http://dev.w3.org/html5/html-device/">proposed <code>&lt;device&gt;</code> element</a>.</p>
    </div>

    <div class="section" id="conformance"><!--OddPage--><h2><span class="secno">2. </span>Conformance</h2><p>As well as sections marked as non-normative, all authoring guidelines, diagrams, examples, and notes in this specification are non-normative. Everything else in this specification is normative.</p>
<p>The key words <em title="must" class="rfc2119">must</em>, <em title="must not" class="rfc2119">must not</em>, <em title="required" class="rfc2119">required</em>, <em title="should" class="rfc2119">should</em>, <em title="should not" class="rfc2119">should not</em>, <em title="recommended" class="rfc2119">recommended</em>, <em title="may" class="rfc2119">may</em>, and <em title="optional" class="rfc2119">optional</em> in this specification are to be interpreted as described in [<cite><a href="#bib-RFC2119" rel="biblioentry" class="bibref">RFC2119</a></cite>].</p>

      <p>
        This specification defines conformance criteria that apply to a single product: the <dfn id="dfn-user-agent">user agent</dfn> that implements the
        interfaces that it contains.
      </p>
      <p>

        Implementations that use ECMAScript to implement the APIs defined in this specification must implement them in a manner consistent
        with the ECMAScript Bindings defined in the Web IDL specification [<cite><a href="#bib-WEBIDL" rel="biblioentry" class="bibref">WEBIDL</a></cite>], as this specification uses that specification and
        terminology.
      </p>

    </div>

    <div class="section" id="security">
    <!--OddPage--><h2><span class="secno">3. </span>Security and Privacy Considerations</h2>
    <p>This specification builds upon the security and privacy protections provided by the [<cite><a href="#bib-HTML5" rel="biblioentry" class="bibref">HTML5</a></cite>] <code>&lt;input type="file"&gt;</code> and the [<cite><a href="#bib-FILE-API" rel="biblioentry" class="bibref">FILE-API</a></cite>] specifications; in particular, it is expected that any offer to start capturing content from the user’s device would require a specific user interaction on an HTML element that is entirely controlled by the user agent.</p>

    <p>In addition to the requirements already highlighted in the [<cite><a href="#bib-HTML5" rel="biblioentry" class="bibref">HTML5</a></cite>] and [<cite><a href="#bib-FILE-API" rel="biblioentry" class="bibref">FILE-API</a></cite>] specifications, implementors should take care of additional leakage of privacy-sensitive data from captured media. For instance, embedding the user’s location in a captured media metadata (e.g. EXIF) might transmit more private data than the user might be expecting.</p>

    </div>


  <div class="section" id="formaccess">
    <!--OddPage--><h2><span class="secno">4. </span>Capture aware file-select control</h2>

    <p>This section is normative.</p>

    <p class="note">[<cite><a href="#bib-HTML5" rel="biblioentry" class="bibref">HTML5</a></cite>] <a href="http://dev.w3.org/html5/spec/number-state.html#file-upload-state">links <code>&lt;input type="file"&gt;</code></a> to the File interface. This specification defines a refined <code>MediaFile</code> interface to be used when the <code>accept</code> attribute take certain values — this will require coordination with the HTML5 Working Group.</p>

    <p>If an input element in the File Upload state [<cite><a href="#bib-HTML5" rel="biblioentry" class="bibref">HTML5</a></cite>] contains
    accept attribute with values <code>image/*</code>,
    <code>audio/*</code>, or <code>video/*</code>, the user agent can
    invoke a file picker that allows respectively the user to take a
    picture, record a sound file, or record a video in addition to
    selecting an existing file from the file system.</p>

    <p>See the <a href="#uiexamples">User Interface Examples</a> appendix for the illustration.

    </p><p>In case the user chooses to capture video, audio, or image
    content, the user agent creates media files on the fly <a href="http://dev.w3.org/html5/spec/number-state.html#file-upload-state">as
    specified</a> in [<cite><a href="#bib-HTML5" rel="biblioentry" class="bibref">HTML5</a></cite>].</p>

    <p>If the user selects files of whose MIME types match <code>image/*</code>,
    <code>audio/*</code>, or <code>video/*</code> (on the filesystem or via a successful media capture), the relevant files in the <code>files</code> attribute [<cite><a href="#bib-HTML5" rel="biblioentry" class="bibref">HTML5</a></cite>] <em title="must" class="rfc2119">must</em> implement the <code>MediaFile</code> interface.</p>

    <pre class="example sh_html sh_sourceCode"><span class="sh_keyword">&lt;input</span> <span class="sh_type">type</span><span class="sh_symbol">=</span><span class="sh_string">"file"</span> <span class="sh_type">accept</span><span class="sh_symbol">=</span><span class="sh_string">"image/*"</span> <span class="sh_type">id</span><span class="sh_symbol">=</span><span class="sh_string">"capture"</span><span class="sh_keyword">&gt;</span> </pre>
</div>

  <div class="section" id="captureparam">
    <!--OddPage--><h2><span class="secno">5. </span>The <code>capture</code> attribute</h2>

    <p>This section is normative.</p>


    <p>The <code>capture</code> attribute may be added to the <code>input</code> element to provide user agents with a hint of that by the default a file picker should be in media capturing mode.</p>

    <p>The <code>capture</code> attribute is an enumerated attribute that can take one of the following values: <code>camera</code>, <code>camcorder</code>, <code>microphone</code>, <code>filesystem</code> (ASCII case-insensitive). These values indicate which source the file picker interface should preferably present to the user by default. Both the invalid and missing default value are <code>filesystem</code>.</p>

    <p class="issue">What to do if there is no accept attribute? What if the accept attribute is set to a value that the pre-hinted device cannot support? See wa href="http://lists.w3.org/Archives/Public/public-device-apis/2011Apr/0013.html"&gt;related discussion./p&gt;

    </p><pre class="idl"><span class="idlInterface" id="idl-def-HTMLInputElement">[<span class="extAttr">Supplemental</span>]
interface <span class="idlInterfaceID">HTMLInputElement</span> {
<span class="idlAttribute">    attribute <span class="idlAttrType"><a>DOMString</a></span> <span class="idlAttrName"><a href="#widl-HTMLInputElement-capture">capture</a></span>;</span>
};</span>
</pre><div class="section" id="attributes"><h3><span class="secno">5.1 </span>Attributes</h3><dl class="attributes"><dt id="widl-HTMLInputElement-capture"><code>capture</code> of type <span class="idlAttrType"><a>DOMString</a></span></dt><dd>One of <code>camera</code>, <code>camcorder</code>, <code>microphone</code>, <code>filesystem</code><div><em>No exceptions.</em></div></dd></dl></div>

    <p>For example, the following code indicates that the user is expected to upload an image from the device camera:</p>
    <pre class="example sh_html sh_sourceCode"><span class="sh_keyword">&lt;input</span> <span class="sh_type">type</span><span class="sh_symbol">=</span><span class="sh_string">"file"</span> <span class="sh_type">accept</span><span class="sh_symbol">=</span><span class="sh_string">"image/*"</span> <span class="sh_type">capture</span><span class="sh_symbol">=</span><span class="sh_string">"camera"</span> <span class="sh_type">id</span><span class="sh_symbol">=</span><span class="sh_string">"capture"</span><span class="sh_keyword">&gt;</span> </pre>
    <p>A possible rendering of a file picker taking this parameter into account is offered in the <a href="#uiexamples">User Interface Examples appendix</a>.</p>
</div>

    <div class="section" id="api">
    <!--OddPage--><h2><span class="secno">6. </span>WebIDL interfaces</h2>

    <div class="section" id="jsexample"><h3><span class="secno">6.1 </span>Example</h3>
      <p>After the user successfully captured or selected an existing media file, the format properties of the file can be retrieved as follow:</p>
      <pre class="example sh_javascript_dom sh_sourceCode"><code><span class="sh_keyword">var</span> captureInput <span class="sh_symbol">=</span> <span class="sh_predef_var">document</span><span class="sh_symbol">.</span><span class="sh_function">getElementById</span><span class="sh_symbol">(</span><span class="sh_string">'capture'</span><span class="sh_symbol">);</span>
<span class="sh_comment">// Accessing the file object from the input element with id capture</span>
<span class="sh_keyword">var</span> file <span class="sh_symbol">=</span> captureInput<span class="sh_symbol">.</span>files<span class="sh_symbol">[</span><span class="sh_number">0</span><span class="sh_symbol">];</span>
<span class="sh_keyword">if</span> <span class="sh_symbol">(</span>file<span class="sh_symbol">)</span> <span class="sh_cbracket">{</span>
  <span class="sh_comment">// getting format data asynchronously</span>
  file<span class="sh_symbol">.</span><a href="#widl-MediaFile-getFormatData"><span class="sh_function">getFormatData</span></a><span class="sh_symbol">(</span>displayFormatData<span class="sh_symbol">,</span> errorHandler<span class="sh_symbol">);</span>
<span class="sh_cbracket">}</span>

<span class="sh_comment">// success callback when getting format data</span>
<span class="sh_keyword">function</span> <span class="sh_function">displayFormatData</span><span class="sh_symbol">(</span>formatData<span class="sh_symbol">)</span> <span class="sh_cbracket">{</span>  
  <span class="sh_keyword">var</span> mainType <span class="sh_symbol">=</span> file<span class="sh_symbol">.</span>type<span class="sh_symbol">.</span><span class="sh_function">split</span><span class="sh_symbol">(</span><span class="sh_string">"/"</span><span class="sh_symbol">)[</span><span class="sh_number">0</span><span class="sh_symbol">];</span> <span class="sh_comment">// "image", "video" or "audio"</span>
  <span class="sh_keyword">var</span> mediaDescriptionNode <span class="sh_symbol">=</span> <span class="sh_predef_var">document</span><span class="sh_symbol">.</span><span class="sh_function">createElement</span><span class="sh_symbol">(</span><span class="sh_string">"p"</span><span class="sh_symbol">);</span>
  <span class="sh_keyword">if</span> <span class="sh_symbol">(</span>mainType <span class="sh_symbol">===</span> <span class="sh_string">"image"</span><span class="sh_symbol">)</span> <span class="sh_cbracket">{</span>
    mediaDescriptionNode<span class="sh_symbol">.</span><span class="sh_function">appendChild</span><span class="sh_symbol">(</span><span class="sh_predef_var">document</span><span class="sh_symbol">.</span><span class="sh_function">createTextNode</span><span class="sh_symbol">(</span><span class="sh_string">"This is an image of dimensions "</span> <span class="sh_symbol">+</span> <a href="#widl-MediaFileData-width">formatData<span class="sh_symbol">.</span><span class="sh_predef_var">width</span></a> <span class="sh_symbol">+</span> <span class="sh_string">"x"</span> <span class="sh_symbol">+</span> <a href="#widl-MediaFileData-height">formatData<span class="sh_symbol">.</span><span class="sh_predef_var">height</span></a><span class="sh_symbol">);</span>
  <span class="sh_cbracket">}</span> <span class="sh_keyword">else</span> <span class="sh_cbracket">{</span>
    mediaDescriptionNode<span class="sh_symbol">.</span><span class="sh_function">appendChild</span><span class="sh_symbol">(</span><span class="sh_predef_var">document</span><span class="sh_symbol">.</span><span class="sh_function">createTextNode</span><span class="sh_symbol">(</span><span class="sh_string">"Duration: "</span> <span class="sh_symbol">+</span> <a href="#widl-MediaFileData-duration">formatData<span class="sh_symbol">.</span>duration</a>  <span class="sh_symbol">+</span> <span class="sh_string">"s"</span><span class="sh_symbol">);</span>
  <span class="sh_cbracket">}</span>
  captureInput<span class="sh_symbol">.</span>parentNode<span class="sh_symbol">.</span><span class="sh_function">insertBefore</span><span class="sh_symbol">(</span>mediaDescriptionNode<span class="sh_symbol">,</span> captureInput<span class="sh_symbol">);</span>
<span class="sh_cbracket">}</span>

<span class="sh_comment">// error callback if getting format data fails</span>
<span class="sh_keyword">function</span> <span class="sh_function">errorHandler</span><span class="sh_symbol">(</span>error<span class="sh_symbol">)</span> <span class="sh_cbracket">{</span>
  <span class="sh_predef_func">alert</span><span class="sh_symbol">(</span><span class="sh_string">"Couldn’t retrieve format properties for the selected file (error code "</span> <span class="sh_symbol">+</span> <a href="#widl-MediaFileDataError-code">error<span class="sh_symbol">.</span>code</a> <span class="sh_symbol">+</span> <span class="sh_string">")"</span><span class="sh_symbol">);</span>
<span class="sh_cbracket">}</span>
</code></pre>
</div>


    <div class="section" id="formatdata"><h3><span class="secno">6.2 </span><a class="idlType" href="#idl-def-MediaFileData"><code>MediaFileData</code></a> interface</h3>

    <p><code>MediaFileData</code> encapsulates format information of a media
    file.</p>

    <p class="note">The relationship between this <code>MediaFileData</code> interface and the properties made available through the API for Media Resource 1.0 [<cite><a href="#bib-MEDIAONT-API" rel="biblioentry" class="bibref">MEDIAONT-API</a></cite>] needs further investigation.</p>

    <pre class="idl"><span class="idlInterface" id="idl-def-MediaFileData">[<span class="extAttr">NoInterfaceObject</span>]
interface <span class="idlInterfaceID">MediaFileData</span> {
<span class="idlAttribute">    attribute <span class="idlAttrType"><a>DOMString</a></span>     <span class="idlAttrName"><a href="#widl-MediaFileData-codecs">codecs</a></span>;</span>
<span class="idlAttribute">    attribute <span class="idlAttrType"><a>unsigned long</a></span> <span class="idlAttrName"><a href="#widl-MediaFileData-bitrate">bitrate</a></span>;</span>
<span class="idlAttribute">    attribute <span class="idlAttrType"><a>unsigned long</a></span> <span class="idlAttrName"><a href="#widl-MediaFileData-height">height</a></span>;</span>
<span class="idlAttribute">    attribute <span class="idlAttrType"><a>unsigned long</a></span> <span class="idlAttrName"><a href="#widl-MediaFileData-width">width</a></span>;</span>
<span class="idlAttribute">    attribute <span class="idlAttrType"><a>float</a></span>         <span class="idlAttrName"><a href="#widl-MediaFileData-duration">duration</a></span>;</span>
};</span>
</pre><div class="section" id="attributes-1"><h4><span class="secno">6.2.1 </span>Attributes</h4><dl class="attributes"><dt id="widl-MediaFileData-bitrate"><code>bitrate</code> of type <span class="idlAttrType"><a>unsigned long</a></span></dt><dd>The codecs attribute only specifies the profile and level of the encoded content
      which doesn't specify the actual bitrate. It only specifies the maximum encoded 
      bitrate, thus this bitrate attribute is the average bitrate of the content. In the case
      of an image this attribute has value 0.<div><em>No exceptions.</em></div></dd><dt id="widl-MediaFileData-codecs"><code>codecs</code> of type <span class="idlAttrType"><a>DOMString</a></span></dt><dd>The type attribute of the Blob interface (inherited from the File interface) is not sufficient to determine the format of the
      content since it only specifies the container type. The codecs attribute
      represents the actual format that the audio and video of the content.
      The codecs attribute <em title="must" class="rfc2119">must</em> conform to the [<cite><a href="#bib-RFC4281" rel="biblioentry" class="bibref">RFC4281</a></cite>].
      For example, a valid value for H.263 video and AAC low
      complexity would be codecs="s263, mp4a.40.2".
	<p class="note">This <a href="http://lists.w3.org/Archives/Public/public-device-apis/2010Jul/0133.html">could be turned into a list of DOMString</a> rather than keeping it as a comma-separated values list; this needs some care with regard to the RFC ref.</p>
<div><em>No exceptions.</em></div></dd><dt id="widl-MediaFileData-duration"><code>duration</code> of type <span class="idlAttrType"><a>float</a></span></dt><dd>The duration attribute represents length of the video or sound
      clip in seconds. In the case of an image this attribute has value 0.<div><em>No exceptions.</em></div></dd><dt id="widl-MediaFileData-height"><code>height</code> of type <span class="idlAttrType"><a>unsigned long</a></span></dt><dd>The height attribute represents height of the image or video
      in pixels. In the case of a sound clip this attribute has value 0.<div><em>No exceptions.</em></div></dd><dt id="widl-MediaFileData-width"><code>width</code> of type <span class="idlAttrType"><a>unsigned long</a></span></dt><dd>The width attribute represents width of the image or video
      in pixels. In the case of a sound clip this attribute has value 0.<div><em>No exceptions.</em></div></dd></dl></div>

    <p class="note">Some of the proposed attributes of the <code>MediaFileData</code> interface could possibly be integrated as parameters of the MIME type, or as MIME options object.</p>
    
    </div>


    <div class="section" id="mediafile"><h3><span class="secno">6.3 </span><a class="idlType" href="#idl-def-MediaFile"><code>MediaFile</code></a> interface</h3>

    <p><code>MediaFile</code> encapsulates a single photo, video or sound
    from the device. It inherits
    from <code><a href="http://www.w3.org/TR/FileAPI/#dfn-file">File</a></code> [<cite><a href="#bib-FILE-API" rel="biblioentry" class="bibref">FILE-API</a></cite>].</p>

    <pre class="idl"><span class="idlInterface" id="idl-def-MediaFile">[<span class="extAttr">NoInterfaceObject</span>]
interface <span class="idlInterfaceID">MediaFile</span> : <span class="idlSuperclass"><a>File</a></span> {
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-MediaFile-getFormatData">getFormatData</a></span> (<span class="idlParam">in <span class="idlParamType"><a class="idlType" href="#idl-def-MediaFileDataSuccessCallback"><code>MediaFileDataSuccessCallback</code></a></span> <span class="idlParamName">successCallback</span></span>, <span class="idlParam">in optional <span class="idlParamType"><a class="idlType" href="#idl-def-MediaFileDataErrorCallback"><code>MediaFileDataErrorCallback</code></a></span> <span class="idlParamName">errorCallback</span></span>);</span>
};</span>
</pre><div class="section" id="methods"><h4><span class="secno">6.3.1 </span>Methods</h4><dl class="methods"><dt id="widl-MediaFile-getFormatData"><code>getFormatData</code></dt><dd>The <code>getFormatData()</code> method takes one or two arguments. When called, it returns immediately and then asynchronously attempts to obtain the format data of the given media file. If the attempt is successful, the <code>successCallback</code> is invoked with a new <code>MediaFileData</code> object, reflecting the format data of the file. If the attempt fails, the <code>errorCallback</code> is invoked with a new MediaFileDataError object, reflecting the reason for the failure.
    <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">successCallback</td><td class="prmType"><code><a class="idlType" href="#idl-def-MediaFileDataSuccessCallback"><code>MediaFileDataSuccessCallback</code></a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc"></td></tr><tr><td class="prmName">errorCallback</td><td class="prmType"><code><a class="idlType" href="#idl-def-MediaFileDataErrorCallback"><code>MediaFileDataErrorCallback</code></a></code></td><td class="prmNullFalse">✘</td><td class="prmOptTrue">✔</td><td class="prmDesc"></td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd></dl></div>
    </div>
    <div class="section" id="mediafiledatasuccesscallback"><h3><span class="secno">6.4 </span><a class="idlType" href="#idl-def-MediaFileDataSuccessCallback"><code>MediaFileDataSuccessCallback</code></a> interface</h3>
    <pre class="idl"><span class="idlInterface" id="idl-def-MediaFileDataSuccessCallback">[<span class="extAttr">Callback=FunctionOnly, NoInterfaceObject</span>]
interface <span class="idlInterfaceID">MediaFileDataSuccessCallback</span> {
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-MediaFileDataSuccessCallback-onSuccess">onSuccess</a></span> (<span class="idlParam">in <span class="idlParamType"><a class="idlType" href="#idl-def-MediaFileData"><code>MediaFileData</code></a></span> <span class="idlParamName">formatData</span></span>);</span>
};</span>
</pre><div class="section" id="methods-1"><h4><span class="secno">6.4.1 </span>Methods</h4><dl class="methods"><dt id="widl-MediaFileDataSuccessCallback-onSuccess"><code>onSuccess</code></dt><dd>
        

    <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">formatData</td><td class="prmType"><code><a class="idlType" href="#idl-def-MediaFileData"><code>MediaFileData</code></a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">
		The MediaFileData object describing the relevant properties of the given media file.
              </td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd></dl></div>
    </div>
    <div class="section" id="mediafiledataerrorcallback"><h3><span class="secno">6.5 </span><a class="idlType" href="#idl-def-MediaFileDataErrorCallback"><code>MediaFileDataErrorCallback</code></a> interface</h3>
    <pre class="idl"><span class="idlInterface" id="idl-def-MediaFileDataErrorCallback">[<span class="extAttr">Callback=FunctionOnly, NoInterfaceObject</span>]
interface <span class="idlInterfaceID">MediaFileDataErrorCallback</span> {
<span class="idlMethod">    <span class="idlMethType"><a>void</a></span> <span class="idlMethName"><a href="#widl-MediaFileDataErrorCallback-onError">onError</a></span> (<span class="idlParam">in <span class="idlParamType"><a class="idlType" href="#idl-def-MediaFileDataError"><code>MediaFileDataError</code></a></span> <span class="idlParamName">error</span></span>);</span>
};</span>
</pre><div class="section" id="methods-2"><h4><span class="secno">6.5.1 </span>Methods</h4><dl class="methods"><dt id="widl-MediaFileDataErrorCallback-onError"><code>onError</code></dt><dd>
        

    <table class="parameters"><tr><th>Parameter</th><th>Type</th><th>Nullable</th><th>Optional</th><th>Description</th></tr><tr><td class="prmName">error</td><td class="prmType"><code><a class="idlType" href="#idl-def-MediaFileDataError"><code>MediaFileDataError</code></a></code></td><td class="prmNullFalse">✘</td><td class="prmOptFalse">✘</td><td class="prmDesc">
		The <code>MediaFileDataError</code> object describing the error encountered while retrieving the format data.
              </td></tr></table><div><em>No exceptions.</em></div><div><em>Return type: </em><code><a>void</a></code></div></dd></dl></div>
    </div>
    <div class="section" id="mediafiledataerror"><h3><span class="secno">6.6 </span><a class="idlType" href="#idl-def-MediaFileDataError"><code>MediaFileDataError</code></a> interface</h3>
<p>The <code>MediaFileDataError</code> interface encapsulates all errors in the retrieval of format data associated with a <code>MediaFile</code> object.</p>
        <pre class="idl"><span class="idlInterface" id="idl-def-MediaFileDataError">[<span class="extAttr">NoInterfaceObject</span>]
interface <span class="idlInterfaceID">MediaFileDataError</span> {
<span class="idlConst">    const <span class="idlConstType"><a>unsigned short</a></span> <span class="idlConstName"><a href="#widl-MediaFileDataError-UNKNOWN_ERROR">UNKNOWN_ERROR</a></span> = <span class="idlConstValue">0</span>;</span>
<span class="idlConst">    const <span class="idlConstType"><a>unsigned short</a></span> <span class="idlConstName"><a href="#widl-MediaFileDataError-TIMEOUT_ERROR">TIMEOUT_ERROR</a></span> = <span class="idlConstValue">1</span>;</span>
<span class="idlAttribute">    readonly attribute <span class="idlAttrType"><a>unsigned short</a></span> <span class="idlAttrName"><a href="#widl-MediaFileDataError-code">code</a></span>;</span>
};</span>
</pre><div class="section" id="attributes-2"><h4><span class="secno">6.6.1 </span>Attributes</h4><dl class="attributes"><dt id="widl-MediaFileDataError-code"><code>code</code> of type <span class="idlAttrType"><a>unsigned short</a></span>, readonly</dt><dd>An error code assigned by an implementation when an error has occurred in retrieving format data.<div><em>No exceptions.</em></div></dd></dl></div><div class="section" id="constants"><h4><span class="secno">6.6.2 </span>Constants</h4><dl class="constants"><dt id="widl-MediaFileDataError-TIMEOUT_ERROR"><code>TIMEOUT_ERROR</code> of type <span class="idlConstType"><a>unsigned short</a></span></dt><dd>
            The requested method timed out before it could be completed.
          </dd><dt id="widl-MediaFileDataError-UNKNOWN_ERROR"><code>UNKNOWN_ERROR</code> of type <span class="idlConstType"><a>unsigned short</a></span></dt><dd>
            An unknown error occurred.
          </dd></dl></div>

    </div>

  </div>


<div class="appendix section" id="uiexamples">
<!--OddPage--><h2><span class="secno">A. </span>User Interface Examples</h2>

<p>A media capture file picker might render as:

</p><p><img alt="A File picker with camera support" src="capture-api-file-picker-concept.png"></p> 
</div>



<div class="appendix section" id="references"><!--OddPage--><h2><span class="secno">B. </span>References</h2><div class="section" id="normative-references"><h3><span class="secno">B.1 </span>Normative references</h3><dl class="bibliography"><dt id="bib-FILE-API">[FILE-API]</dt><dd>Arun Ranganathan. <a href="http://www.w3.org/TR/2009/WD-FileAPI-20091117/"><cite>File API.</cite></a> 17 November 2009. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2009/WD-FileAPI-20091117/">http://www.w3.org/TR/2009/WD-FileAPI-20091117/</a> 
</dd><dt id="bib-HTML5">[HTML5]</dt><dd>Ian Hickson; David Hyatt. <a href="http://www.w3.org/TR/2010/WD-html5-20100304/"><cite>HTML 5.</cite></a> 4 March 2010. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2010/WD-html5-20100304/">http://www.w3.org/TR/2010/WD-html5-20100304/</a> 
</dd><dt id="bib-RFC2119">[RFC2119]</dt><dd>S. Bradner. <a href="http://www.ietf.org/rfc/rfc2119.txt"><cite>Key words for use in RFCs to Indicate Requirement Levels.</cite></a> March 1997. Internet RFC 2119.  URL: <a href="http://www.ietf.org/rfc/rfc2119.txt">http://www.ietf.org/rfc/rfc2119.txt</a> 
</dd><dt id="bib-RFC4281">[RFC4281]</dt><dd>R. Gellens, D. Singer, P. Frojdh. <a href="http://www.ietf.org/rfc/rfc4281.txt"><cite>The Codecs Parameter for "Bucket" Media Types</cite></a> November 2005. Internet RFC 4281. URL: <a href="http://www.ietf.org/rfc/rfc4281.txt">http://www.ietf.org/rfc/rfc4281.txt</a> 
</dd><dt id="bib-WEBIDL">[WEBIDL]</dt><dd>Cameron McCormack. <a href="http://www.w3.org/TR/2008/WD-WebIDL-20081219"><cite>Web IDL.</cite></a> 19 December 2008. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2008/WD-WebIDL-20081219">http://www.w3.org/TR/2008/WD-WebIDL-20081219</a> 
</dd></dl></div><div class="section" id="informative-references"><h3><span class="secno">B.2 </span>Informative references</h3><dl class="bibliography"><dt id="bib-MEDIAONT-API">[MEDIAONT-API]</dt><dd>WonSuk Lee; Florian Stegmaier; Chris Poppe. <a href="http://www.w3.org/TR/2010/WD-mediaont-api-1.0-20100608"><cite>API for Media Resource 1.0</cite></a> 8 June 2010. W3C Working Draft (Work in progress). URL: <a href="http://www.w3.org/TR/2010/WD-mediaont-api-1.0-20100608">http://www.w3.org/TR/2010/WD-mediaont-api-1.0-20100608</a> 
</dd></dl></div></div></body></html>
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