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Queue a task to handle media session action (#314)
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SHA: 99e66fc
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jan-ivar and github-actions[bot] committed Feb 16, 2024
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<link href="https://www.w3.org/StyleSheets/TR/2021/W3C-ED" rel="stylesheet">
<meta content="Bikeshed version 82ce88815, updated Thu Sep 7 16:33:55 2023 -0700" name="generator">
<link href="https://www.w3.org/TR/mediasession/" rel="canonical">
<meta content="fac2b9a5684d568fc1d0059fb4d81a05ec8d6315" name="document-revision">
<meta content="99e66fcf2a6f7c55d9c294713296efe0dbfc0810" name="document-revision">
<style>
/* https://github.com/tabatkins/bikeshed/issues/485 */
.example .self-link { display: none; }
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<div class="head">
<p data-fill-with="logo"><a class="logo" href="https://www.w3.org/"> <img alt="W3C" height="48" src="https://www.w3.org/StyleSheets/TR/2021/logos/W3C" width="72"> </a> </p>
<h1 class="p-name no-ref" id="title">Media Session</h1>
<p id="w3c-state"><a href="https://www.w3.org/standards/types#ED">Editor’s Draft</a>, <time class="dt-updated" datetime="2024-02-15">15 February 2024</time></p>
<p id="w3c-state"><a href="https://www.w3.org/standards/types#ED">Editor’s Draft</a>, <time class="dt-updated" datetime="2024-02-16">16 February 2024</time></p>
<details open>
<summary>More details about this document</summary>
<div data-fill-with="spec-metadata">
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actions update algorithm</a> in order to avoid UI flickering when multiple
actions are modified in the same event loop. </p>
<p> When the user agent is notified by a <a data-link-type="dfn" href="#media-session-action-source" id="ref-for-media-session-action-source④">media session action source</a> named <var>source</var> that a <a data-link-type="dfn" href="#media-session-action" id="ref-for-media-session-action⑤">media session action</a> named <var>action</var> has been triggered,
the user agent MUST run the <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="handle-media-session-action">handle media session action</dfn> steps
as follows: </p>
the user agent MUST <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#queue-a-task" id="ref-for-queue-a-task①">queue a task</a>, using the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#user-interaction-task-source" id="ref-for-user-interaction-task-source">user interaction task source</a>, to run the following <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="handle-media-session-action">handle media session action</dfn> steps: </p>
<ol>
<li> Let <var>session</var> be <var>source</var>’s <a data-link-type="dfn" href="#media-session-action-source-target" id="ref-for-media-session-action-source-target①">target</a>.
<li> If <var>session</var> is <code>null</code>, set <var>session</var> to
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<li> Run the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/interaction.html#activation-notification" id="ref-for-activation-notification">activation notification</a> steps in the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#browsing-context" id="ref-for-browsing-context⑥">browsing context</a> associated with <var>session</var>.
</ol>
<p></p>
<p> When the user agent receives a joint command for <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-play" id="ref-for-dom-mediasessionaction-play②">play</a> and <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-pause" id="ref-for-dom-mediasessionaction-pause③">pause</a>, such as a headset button click, it MUST
run the following steps: </p>
<p> When the user agent receives a joint command for <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-play" id="ref-for-dom-mediasessionaction-play②">play</a> and <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-pause" id="ref-for-dom-mediasessionaction-pause③">pause</a>, such as a headset button click, it MUST <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#queue-a-task" id="ref-for-queue-a-task②">queue a task</a>, using the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#user-interaction-task-source" id="ref-for-user-interaction-task-source①">user interaction task source</a>, to run the following steps: </p>
<ol>
<li> If the <a data-link-type="dfn" href="#active-media-session" id="ref-for-active-media-session①⑦">active media session</a> is <code>null</code>, abort these
steps.
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If <var>applyPausePolicy</var> is <code>true</code>, run the following substeps:
<ol>
<li> Let <var>newMutedState</var> be <code>true</code> if <var>active</var> is <code>false</code> and <code>false</code> otherwise.
<li> For each <a data-link-type="dfn" href="https://www.w3.org/TR/mediacapture-streams/#mediastreamtrack" id="ref-for-mediastreamtrack">MediaStreamTrack</a> whose source is of type <var>captureKind</var>, <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#queue-a-task" id="ref-for-queue-a-task①">queue a task</a> to <a data-link-type="dfn" href="https://www.w3.org/TR/mediacapture-streams/#set-track-muted" id="ref-for-set-track-muted①">set MediaStreamTrack muted state</a> to <var>newMutedState</var>.
<li> For each <a data-link-type="dfn" href="https://www.w3.org/TR/mediacapture-streams/#mediastreamtrack" id="ref-for-mediastreamtrack">MediaStreamTrack</a> whose source is of type <var>captureKind</var>, <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#queue-a-task" id="ref-for-queue-a-task③">queue a task</a> to <a data-link-type="dfn" href="https://www.w3.org/TR/mediacapture-streams/#set-track-muted" id="ref-for-set-track-muted①">set MediaStreamTrack muted state</a> to <var>newMutedState</var>.
</ol>
</ol>
<li> Return <var>p</var>.
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<li> If the instance has no associated <a data-link-type="dfn" href="#mediametadata-media-session" id="ref-for-mediametadata-media-session③">media session</a>,
abort these steps.
<li>
Otherwise, <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#queue-a-task" id="ref-for-queue-a-task②">queue a task</a> to run the following substeps:
Otherwise, <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#queue-a-task" id="ref-for-queue-a-task④">queue a task</a> to run the following substeps:
<ol>
<li> If the instance no longer has an associated <a data-link-type="dfn" href="#mediametadata-media-session" id="ref-for-mediametadata-media-session④">media
session</a>, abort these steps.
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<li><span class="dfn-paneled" id="ae2a6342">top-level browsing context</span>
<li><span class="dfn-paneled" id="47fe679e">transient activation</span>
<li><span class="dfn-paneled" id="16cfba2b">unordered set of unique space-separated tokens</span>
<li><span class="dfn-paneled" id="825cbc48">user interaction task source</span>
<li><span class="dfn-paneled" id="b4c365f8">visibility state</span>
</ul>
<li>
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