From 27dba3039c1f6be59a74d7f6b67ec9d68d757e7b Mon Sep 17 00:00:00 2001
From: jianjunz <jianjun.zhu@intel.com>
Date: Thu, 18 Jul 2024 14:27:05 +0000
Subject: [PATCH] Add voiceactivity action. (#333)

SHA: 0f6e6934179f0d5b3aedad2ecac590a2ea2158ef
Reason: push, by youennf

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 index.html | 71 +++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 59 insertions(+), 12 deletions(-)

diff --git a/index.html b/index.html
index c5ab9ad..8ee7d55 100644
--- a/index.html
+++ b/index.html
@@ -7,7 +7,7 @@
   <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="16336bf2f69f13d8d93ad6ea41507ac664c8c380" name="document-revision">
+  <meta content="0f6e6934179f0d5b3aedad2ecac590a2ea2158ef" name="document-revision">
 <style>
   /* https://github.com/tabatkins/bikeshed/issues/485 */
   .example .self-link { display: none; }
@@ -669,7 +669,7 @@
   <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="2024-07-04">4 July 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="2024-07-18">18 July 2024</time></p>
    <details open>
     <summary>More details about this document</summary>
     <div data-fill-with="spec-metadata">
@@ -968,6 +968,9 @@ <h3 class="heading settled" data-level="3.4" id="actions-model"><span class="sec
       <li> <dfn class="dfn-paneled idl-code" data-dfn-for="MediaSessionAction" data-dfn-type="enum-value" data-export data-lt="&quot;enterpictureinpicture&quot;|enterpictureinpicture" id="dom-mediasessionaction-enterpictureinpicture"><code>enterpictureinpicture</code></dfn>:
           the action’s intent is to open the media session in a
           picture-in-picture window. 
+      <li> <dfn class="dfn-paneled idl-code" data-dfn-for="MediaSessionAction" data-dfn-type="enum-value" data-export data-lt="&quot;voiceactivity&quot;|voiceactivity" id="dom-mediasessionaction-voiceactivity"><code>voiceactivity</code></dfn>:
+          the action’s intent is to notify the web page that voice activity has
+          been detected by the microphone. 
      </ul>
      <p></p>
      <p> All <code class="idl"><a data-link-type="idl" href="#mediasession" id="ref-for-mediasession④">MediaSession</a></code>s have a map of <dfn class="dfn-paneled" data-dfn-type="dfn" data-lt="supported media session actions" data-noexport id="supported-media-session-actions">supported media session
@@ -1020,7 +1023,20 @@ <h3 class="heading settled" data-level="3.4" id="actions-model"><span class="sec
       via <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/mediacapture-main/#dom-mediastreamtrack" id="ref-for-dom-mediastreamtrack">MediaStreamTrack</a></code>'s <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/mediacapture-main/#dom-mediastreamtrack-muted" id="ref-for-dom-mediastreamtrack-muted">muted</a></code> attribute in addition to <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-togglemicrophone" id="ref-for-dom-mediasessionaction-togglemicrophone①">togglemicrophone</a></code>, <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-togglecamera" id="ref-for-dom-mediasessionaction-togglecamera①">togglecamera</a></code> or <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-togglescreenshare" id="ref-for-dom-mediasessionaction-togglescreenshare①">togglescreenshare</a></code> <a data-link-type="dfn" href="#media-session-action" id="ref-for-media-session-action⑨">media session action</a>. In that
       case, the user agent MUST execute the corresponding <code class="idl"><a data-link-type="idl" href="#callbackdef-mediasessionactionhandler" id="ref-for-callbackdef-mediasessionactionhandler②">MediaSessionActionHandler</a></code> before running, as different tasks, the
       steps defined to <a data-link-type="abstract-op" href="https://w3c.github.io/mediacapture-main/#set-track-muted" id="ref-for-set-track-muted">set a track’s muted state</a>. </p>
-     <p class="note" role="note"> A page should only register a <code class="idl"><a data-link-type="idl" href="#callbackdef-mediasessionactionhandler" id="ref-for-callbackdef-mediasessionactionhandler③">MediaSessionActionHandler</a></code> for a <a data-link-type="dfn" href="#media-session-action" id="ref-for-media-session-action①⓪">media
+     <p> The <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-voiceactivity" id="ref-for-dom-mediasessionaction-voiceactivity">voiceactivity</a></code> action source MUST always have a
+      target whose document MUST always have <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/mediacapture-main/#idl-def-MediaStreamTrackState.live" id="ref-for-idl-def-MediaStreamTrackState.live">live</a></code> microphone <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/mediacapture-main/#dom-mediastreamtrack" id="ref-for-dom-mediastreamtrack①">MediaStreamTrack</a></code>s. A user agent MUST invoke the <code class="idl"><a data-link-type="idl" href="#callbackdef-mediasessionactionhandler" id="ref-for-callbackdef-mediasessionactionhandler③">MediaSessionActionHandler</a></code> for <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-voiceactivity" id="ref-for-dom-mediasessionaction-voiceactivity①">voiceactivity</a></code> only when voice activity is detected from a microphone with one or more <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/mediacapture-main/#idl-def-MediaStreamTrackState.live" id="ref-for-idl-def-MediaStreamTrackState.live①">live</a></code> <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/mediacapture-main/#dom-mediastreamtrack" id="ref-for-dom-mediastreamtrack②">MediaStreamTrack</a></code>s. A user agent MAY
+      ignore voice activity if the microphone is not muted and all <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/mediacapture-main/#dom-mediastreamtrack" id="ref-for-dom-mediastreamtrack③">MediaStreamTrack</a></code>s associated with the microphone are <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/mediacapture-main/#dom-mediastreamtrack-enabled" id="ref-for-dom-mediastreamtrack-enabled">enabled</a></code>. It is RECOMMENDED for user agents to set a
+      minimal interval between invocations of the <code class="idl"><a data-link-type="idl" href="#callbackdef-mediasessionactionhandler" id="ref-for-callbackdef-mediasessionactionhandler④">MediaSessionActionHandler</a></code> for <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-voiceactivity" id="ref-for-dom-mediasessionaction-voiceactivity②">voiceactivity</a></code> based on privacy and power
+      efficiency policies. </p>
+     <p class="note" role="note"> <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-voiceactivity" id="ref-for-dom-mediasessionaction-voiceactivity③">voiceactivity</a></code> only indicates the start of voice
+      activity. Applications may display a notification if the user is speaking
+      while the <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/mediacapture-main/#dom-mediastreamtrack" id="ref-for-dom-mediastreamtrack④">MediaStreamTrack</a></code> is muted, or start an <code class="idl"><a data-link-type="idl" href="https://webaudio.github.io/web-audio-api/#AudioWorklet" id="ref-for-AudioWorklet">AudioWorklet</a></code> for
+      audio processing. No action is defined for the end of voice activity.
+      Unlike other actions which are explicitly triggered by the user, <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-voiceactivity" id="ref-for-dom-mediasessionaction-voiceactivity④">voiceactivity</a></code> also depends on the voice activity
+      detection algorithm of the user agent or the system. For privacy and power
+      efficiency concerns, the web page may not be notified if voice activity
+      ends and restarts soon after the last <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-voiceactivity" id="ref-for-dom-mediasessionaction-voiceactivity⑤">voiceactivity</a></code> action. </p>
+     <p class="note" role="note"> A page should only register a <code class="idl"><a data-link-type="idl" href="#callbackdef-mediasessionactionhandler" id="ref-for-callbackdef-mediasessionactionhandler⑤">MediaSessionActionHandler</a></code> for a <a data-link-type="dfn" href="#media-session-action" id="ref-for-media-session-action①⓪">media
       session action</a> when it can handle the action given that the user agent
       will list this as a <a data-link-type="dfn" href="#supported-media-session-actions" id="ref-for-supported-media-session-actions④">supported media session action</a> and update the <a data-link-type="dfn" href="#media-session-action-source" id="ref-for-media-session-action-source⑤">media session action sources</a>. </p>
      <p> When the <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="media-session-actions-update-algorithm">media session actions update algorithm</dfn> is invoked, the
@@ -1120,7 +1136,8 @@ <h2 class="heading settled" data-level="4" id="the-mediasession-interface"><span
   <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-hangup" id="ref-for-dom-mediasessionaction-hangup①"><c- s>"hangup"</c-></a>,
   <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-previousslide" id="ref-for-dom-mediasessionaction-previousslide"><c- s>"previousslide"</c-></a>,
   <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-nextslide" id="ref-for-dom-mediasessionaction-nextslide"><c- s>"nextslide"</c-></a>,
-  <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-enterpictureinpicture" id="ref-for-dom-mediasessionaction-enterpictureinpicture"><c- s>"enterpictureinpicture"</c-></a>
+  <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-enterpictureinpicture" id="ref-for-dom-mediasessionaction-enterpictureinpicture"><c- s>"enterpictureinpicture"</c-></a>,
+  <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-voiceactivity" id="ref-for-dom-mediasessionaction-voiceactivity⑥"><c- s>"voiceactivity"</c-></a>
 };
 
 <c- b>callback</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="callback" data-export id="callbackdef-mediasessionactionhandler"><code><c- g>MediaSessionActionHandler</c-></code></dfn> = <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined"><c- b>undefined</c-></a>(<a data-link-type="idl-name" href="#dictdef-mediasessionactiondetails" id="ref-for-dictdef-mediasessionactiondetails①"><c- n>MediaSessionActionDetails</c-></a> <dfn class="idl-code" data-dfn-for="MediaSessionActionHandler" data-dfn-type="argument" data-export id="dom-mediasessionactionhandler-details"><code><c- g>details</c-></code><a class="self-link" href="#dom-mediasessionactionhandler-details"></a></dfn>);
@@ -1131,7 +1148,7 @@ <h2 class="heading settled" data-level="4" id="the-mediasession-interface"><span
 
   <c- b>attribute</c-> <a data-link-type="idl-name" href="#enumdef-mediasessionplaybackstate" id="ref-for-enumdef-mediasessionplaybackstate"><c- n>MediaSessionPlaybackState</c-></a> <a class="idl-code" data-link-type="attribute" data-type="MediaSessionPlaybackState" href="#dom-mediasession-playbackstate" id="ref-for-dom-mediasession-playbackstate③"><c- g>playbackState</c-></a>;
 
-  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined①"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-mediasession-setactionhandler" id="ref-for-dom-mediasession-setactionhandler"><c- g>setActionHandler</c-></a>(<a data-link-type="idl-name" href="#enumdef-mediasessionaction" id="ref-for-enumdef-mediasessionaction①"><c- n>MediaSessionAction</c-></a> <dfn class="idl-code" data-dfn-for="MediaSession/setActionHandler(action, handler)" data-dfn-type="argument" data-export id="dom-mediasession-setactionhandler-action-handler-action"><code><c- g>action</c-></code><a class="self-link" href="#dom-mediasession-setactionhandler-action-handler-action"></a></dfn>, <a data-link-type="idl-name" href="#callbackdef-mediasessionactionhandler" id="ref-for-callbackdef-mediasessionactionhandler④"><c- n>MediaSessionActionHandler</c-></a>? <dfn class="idl-code" data-dfn-for="MediaSession/setActionHandler(action, handler)" data-dfn-type="argument" data-export id="dom-mediasession-setactionhandler-action-handler-handler"><code><c- g>handler</c-></code><a class="self-link" href="#dom-mediasession-setactionhandler-action-handler-handler"></a></dfn>);
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined①"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-mediasession-setactionhandler" id="ref-for-dom-mediasession-setactionhandler"><c- g>setActionHandler</c-></a>(<a data-link-type="idl-name" href="#enumdef-mediasessionaction" id="ref-for-enumdef-mediasessionaction①"><c- n>MediaSessionAction</c-></a> <dfn class="idl-code" data-dfn-for="MediaSession/setActionHandler(action, handler)" data-dfn-type="argument" data-export id="dom-mediasession-setactionhandler-action-handler-action"><code><c- g>action</c-></code><a class="self-link" href="#dom-mediasession-setactionhandler-action-handler-action"></a></dfn>, <a data-link-type="idl-name" href="#callbackdef-mediasessionactionhandler" id="ref-for-callbackdef-mediasessionactionhandler⑥"><c- n>MediaSessionActionHandler</c-></a>? <dfn class="idl-code" data-dfn-for="MediaSession/setActionHandler(action, handler)" data-dfn-type="argument" data-export id="dom-mediasession-setactionhandler-action-handler-handler"><code><c- g>handler</c-></code><a class="self-link" href="#dom-mediasession-setactionhandler-action-handler-handler"></a></dfn>);
 
   <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined②"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-mediasession-setpositionstate" id="ref-for-dom-mediasession-setpositionstate"><c- g>setPositionState</c-></a>(<c- b>optional</c-> <a data-link-type="idl-name" href="#dictdef-mediapositionstate" id="ref-for-dictdef-mediapositionstate①"><c- n>MediaPositionState</c-></a> <dfn class="idl-code" data-dfn-for="MediaSession/setPositionState(state), MediaSession/setPositionState()" data-dfn-type="argument" data-export id="dom-mediasession-setpositionstate-state-state"><code><c- g>state</c-></code><a class="self-link" href="#dom-mediasession-setpositionstate-state-state"></a></dfn> = {});
 
@@ -1250,7 +1267,7 @@ <h2 class="heading settled" data-level="4" id="the-mediasession-interface"><span
           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 <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/mediacapture-main/#dom-mediastreamtrack" id="ref-for-dom-mediastreamtrack①">MediaStreamTrack</a></code> 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="abstract-op" href="https://w3c.github.io/mediacapture-main/#set-track-muted" id="ref-for-set-track-muted①">set a track’s muted state</a> to <var>newMutedState</var>. 
+        <li> For each <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/mediacapture-main/#dom-mediastreamtrack" id="ref-for-dom-mediastreamtrack⑤">MediaStreamTrack</a></code> 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="abstract-op" href="https://w3c.github.io/mediacapture-main/#set-track-muted" id="ref-for-set-track-muted①">set a track’s muted state</a> to <var>newMutedState</var>. 
        </ol>
      </ol>
     <li> Return <var>p</var>. 
@@ -1490,7 +1507,7 @@ <h2 class="heading settled" data-level="9" id="the-mediasessionactiondetails-dic
 };
 
 </pre>
-   <p>The <code class="idl"><a data-link-type="idl" href="#callbackdef-mediasessionactionhandler" id="ref-for-callbackdef-mediasessionactionhandler⑤">MediaSessionActionHandler</a></code> MUST be run with the <var>details</var> parameter whose dictionary type is:</p>
+   <p>The <code class="idl"><a data-link-type="idl" href="#callbackdef-mediasessionactionhandler" id="ref-for-callbackdef-mediasessionactionhandler⑦">MediaSessionActionHandler</a></code> MUST be run with the <var>details</var> parameter whose dictionary type is:</p>
    <ul>
     <li><code class="idl"><a data-link-type="idl" href="#dictdef-mediasessionactiondetails" id="ref-for-dictdef-mediasessionactiondetails⑥">MediaSessionActionDetails</a></code> for <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-play" id="ref-for-dom-mediasessionaction-play⑦">play</a></code>.
     <li><code class="idl"><a data-link-type="idl" href="#dictdef-mediasessionactiondetails" id="ref-for-dictdef-mediasessionactiondetails⑦">MediaSessionActionDetails</a></code> for <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-pause" id="ref-for-dom-mediasessionaction-pause⑧">pause</a></code>.
@@ -1508,8 +1525,9 @@ <h2 class="heading settled" data-level="9" id="the-mediasessionactiondetails-dic
     <li><code class="idl"><a data-link-type="idl" href="#dictdef-mediasessionactiondetails" id="ref-for-dictdef-mediasessionactiondetails①③">MediaSessionActionDetails</a></code> for <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-previousslide" id="ref-for-dom-mediasessionaction-previousslide①">previousslide</a></code>.
     <li><code class="idl"><a data-link-type="idl" href="#dictdef-mediasessionactiondetails" id="ref-for-dictdef-mediasessionactiondetails①④">MediaSessionActionDetails</a></code> for <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-nextslide" id="ref-for-dom-mediasessionaction-nextslide①">nextslide</a></code>.
     <li><code class="idl"><a data-link-type="idl" href="#dictdef-mediasessionactiondetails" id="ref-for-dictdef-mediasessionactiondetails①⑤">MediaSessionActionDetails</a></code> for <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-enterpictureinpicture" id="ref-for-dom-mediasessionaction-enterpictureinpicture①">enterpictureinpicture</a></code>.
+    <li><code class="idl"><a data-link-type="idl" href="#dictdef-mediasessionactiondetails" id="ref-for-dictdef-mediasessionactiondetails①⑥">MediaSessionActionDetails</a></code> for <code class="idl"><a data-link-type="idl" href="#dom-mediasessionaction-voiceactivity" id="ref-for-dom-mediasessionaction-voiceactivity⑦">voiceactivity</a></code>.
    </ul>
-   <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="MediaSessionActionDetails" data-dfn-type="dict-member" data-export id="dom-mediasessionactiondetails-action"><code>action</code></dfn> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary-member" id="ref-for-dfn-dictionary-member⑥">dictionary member</a> is used to specify the <a data-link-type="dfn" href="#media-session-action" id="ref-for-media-session-action①③">media session action</a> that the <code class="idl"><a data-link-type="idl" href="#callbackdef-mediasessionactionhandler" id="ref-for-callbackdef-mediasessionactionhandler⑥">MediaSessionActionHandler</a></code> is associated with.</p>
+   <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="MediaSessionActionDetails" data-dfn-type="dict-member" data-export id="dom-mediasessionactiondetails-action"><code>action</code></dfn> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary-member" id="ref-for-dfn-dictionary-member⑥">dictionary member</a> is used to specify the <a data-link-type="dfn" href="#media-session-action" id="ref-for-media-session-action①③">media session action</a> that the <code class="idl"><a data-link-type="idl" href="#callbackdef-mediasessionactionhandler" id="ref-for-callbackdef-mediasessionactionhandler⑧">MediaSessionActionHandler</a></code> is associated with.</p>
    <p>The <dfn class="dfn-paneled idl-code" data-dfn-for="MediaSessionSeekActionDetails" data-dfn-type="dict-member" data-export id="dom-mediasessionseekactiondetails-seekoffset"><code>seekOffset</code></dfn> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary-member" id="ref-for-dfn-dictionary-member⑦">dictionary member</a> is the time in seconds to move the playback time by. If
 present, it should always be positive. If it is not provided then the site
 should choose a sensible time (e.g. a few seconds).</p>
@@ -1764,6 +1782,19 @@ <h2 class="heading settled" data-level="11" id="examples"><span class="secno">11
 <pre class="lang-javascript highlight">navigator<c- p>.</c->mediaSession<c- p>.</c->setActionHandler<c- p>(</c-><c- u>"enterpictureinpicture"</c-><c- p>,</c-> <c- a>function</c-><c- p>()</c-> <c- p>{</c->
   remoteVideo<c- p>.</c->requestPictureInPicture<c- p>();</c->
 <c- p>});</c->
+</pre>
+   </div>
+   <div class="example" id="example-enterpictureinpicture①">
+    <a class="self-link" href="#example-enterpictureinpicture①"></a> Handling voice activity: 
+<pre class="lang-javascript highlight"><c- c1>// Create a MediaStream with audio enabled.</c->
+<c- a>const</c-> stream <c- o>=</c-> <c- k>await</c-> navigator<c- p>.</c->mediaDevices<c- p>.</c->getUserMedia<c- p>({</c->audio<c- o>:</c-><c- kc>true</c-><c- p>});</c->
+<c- a>const</c-> track <c- o>=</c-> stream<c- p>.</c->getAudioTracks<c- p>()[</c-><c- mf>0</c-><c- p>];</c->
+navigator<c- p>.</c->mediaSession<c- p>.</c->setActionHandler<c- p>(</c-><c- u>"voiceactivity"</c-><c- p>,</c-> <c- a>function</c-><c- p>()</c-> <c- p>{</c->
+  <c- k>if</c-> <c- p>(</c->track<c- p>.</c->muted<c- p>)</c-> <c- p>{</c->
+    <c- c1>// Show unmute notification. If user allows to unmute, call</c->
+    <c- c1>// setMicrophoneActive(true) to unmute.</c->
+  <c- p>}</c->
+<c- p>});</c->
 </pre>
    </div>
    <h2 class="no-num heading settled" id="acknowledgments"><span class="content">Acknowledgments</span><a class="self-link" href="#acknowledgments"></a></h2>
@@ -2003,6 +2034,8 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#update-action-handler-algorithm">update action handler algorithm</a><span>, in § 3.4</span>
    <li><a href="#update-capture-state-algorithm">update capture state algorithm</a><span>, in § 4</span>
    <li><a href="#update-metadata-algorithm">update metadata algorithm</a><span>, in § 3.3</span>
+   <li><a href="#dom-mediasessionaction-voiceactivity">"voiceactivity"</a><span>, in § 3.4</span>
+   <li><a href="#dom-mediasessionaction-voiceactivity">voiceactivity</a><span>, in § 3.4</span>
   </ul>
   <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span class="content">Terms defined by reference</span><a class="self-link" href="#index-defined-elsewhere"></a></h3>
   <ul class="index">
@@ -2061,6 +2094,8 @@ <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span cla
     <a data-link-type="biblio">[MEDIACAPTURE-STREAMS]</a> defines the following terms:
     <ul>
      <li><span class="dfn-paneled" id="bc1e4fa1">MediaStreamTrack</span>
+     <li><span class="dfn-paneled" id="15bac70a">enabled</span>
+     <li><span class="dfn-paneled" id="84017020">live</span>
      <li><span class="dfn-paneled" id="2cf6d842">muted</span>
      <li><span class="dfn-paneled" id="c26e55a2">set a track's muted state</span>
     </ul>
@@ -2081,6 +2116,11 @@ <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span cla
     <ul>
      <li><span class="dfn-paneled" id="ca3ca4ae">url parser</span>
     </ul>
+   <li>
+    <a data-link-type="biblio">[WEBAUDIO]</a> defines the following terms:
+    <ul>
+     <li><span class="dfn-paneled" id="1bb59bab">AudioWorklet</span>
+    </ul>
    <li>
     <a data-link-type="biblio">[WEBIDL]</a> defines the following terms:
     <ul>
@@ -2132,6 +2172,8 @@ <h3 class="no-num no-ref heading settled" id="informative"><span class="content"
   <dl>
    <dt id="biblio-image-resource">[IMAGE-RESOURCE]
    <dd>Aaron Gustafson; Rayan Kanso; Marcos Caceres. <a href="https://w3c.github.io/image-resource/"><cite>Image Resource</cite></a>. URL: <a href="https://w3c.github.io/image-resource/">https://w3c.github.io/image-resource/</a>
+   <dt id="biblio-webaudio">[WEBAUDIO]
+   <dd>Paul Adenot; Hongchan Choi. <a href="https://webaudio.github.io/web-audio-api/"><cite>Web Audio API</cite></a>. URL: <a href="https://webaudio.github.io/web-audio-api/">https://webaudio.github.io/web-audio-api/</a>
   </dl>
   <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">IDL Index</span><a class="self-link" href="#idl-index"></a></h2>
 <pre class="idl highlight def">[<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed"><c- g>Exposed</c-></a>=<c- n>Window</c->]
@@ -2161,7 +2203,8 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
   <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-hangup"><c- s>"hangup"</c-></a>,
   <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-previousslide"><c- s>"previousslide"</c-></a>,
   <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-nextslide"><c- s>"nextslide"</c-></a>,
-  <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-enterpictureinpicture"><c- s>"enterpictureinpicture"</c-></a>
+  <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-enterpictureinpicture"><c- s>"enterpictureinpicture"</c-></a>,
+  <a class="idl-code" data-link-type="enum-value" href="#dom-mediasessionaction-voiceactivity"><c- s>"voiceactivity"</c-></a>
 };
 
 <c- b>callback</c-> <a href="#callbackdef-mediasessionactionhandler"><code><c- g>MediaSessionActionHandler</c-></code></a> = <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined"><c- b>undefined</c-></a>(<a data-link-type="idl-name" href="#dictdef-mediasessionactiondetails"><c- n>MediaSessionActionDetails</c-></a> <a href="#dom-mediasessionactionhandler-details"><code><c- g>details</c-></code></a>);
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@@ -2637,6 +2683,7 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
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+window.dfnpanelData['dom-mediasessionaction-voiceactivity'] = {"dfnID": "dom-mediasessionaction-voiceactivity", "url": "#dom-mediasessionaction-voiceactivity", "dfnText": "voiceactivity", "refSections": [{"refs": [{"id": "ref-for-dom-mediasessionaction-voiceactivity"}, {"id": "ref-for-dom-mediasessionaction-voiceactivity\u2460"}, {"id": "ref-for-dom-mediasessionaction-voiceactivity\u2461"}, {"id": "ref-for-dom-mediasessionaction-voiceactivity\u2462"}, {"id": "ref-for-dom-mediasessionaction-voiceactivity\u2463"}, {"id": "ref-for-dom-mediasessionaction-voiceactivity\u2464"}], "title": "3.4. Actions"}, {"refs": [{"id": "ref-for-dom-mediasessionaction-voiceactivity\u2465"}], "title": "4. The MediaSession interface"}, {"refs": [{"id": "ref-for-dom-mediasessionaction-voiceactivity\u2466"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};
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@@ -2650,7 +2697,7 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
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-window.dfnpanelData['dictdef-mediasessionactiondetails'] = {"dfnID": "dictdef-mediasessionactiondetails", "url": "#dictdef-mediasessionactiondetails", "dfnText": "MediaSessionActionDetails", "refSections": [{"refs": [{"id": "ref-for-dictdef-mediasessionactiondetails"}], "title": "3.4. Actions"}, {"refs": [{"id": "ref-for-dictdef-mediasessionactiondetails\u2460"}], "title": "4. The MediaSession interface"}, {"refs": [{"id": "ref-for-dictdef-mediasessionactiondetails\u2461"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2462"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2463"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2464"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2465"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2466"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2467"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2468"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u24ea"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u2460"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u2461"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u2462"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u2463"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u2464"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};
+window.dfnpanelData['dictdef-mediasessionactiondetails'] = {"dfnID": "dictdef-mediasessionactiondetails", "url": "#dictdef-mediasessionactiondetails", "dfnText": "MediaSessionActionDetails", "refSections": [{"refs": [{"id": "ref-for-dictdef-mediasessionactiondetails"}], "title": "3.4. Actions"}, {"refs": [{"id": "ref-for-dictdef-mediasessionactiondetails\u2460"}], "title": "4. The MediaSession interface"}, {"refs": [{"id": "ref-for-dictdef-mediasessionactiondetails\u2461"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2462"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2463"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2464"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2465"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2466"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2467"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2468"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u24ea"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u2460"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u2461"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u2462"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u2463"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u2464"}, {"id": "ref-for-dictdef-mediasessionactiondetails\u2460\u2465"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};
 window.dfnpanelData['dictdef-mediasessionseekactiondetails'] = {"dfnID": "dictdef-mediasessionseekactiondetails", "url": "#dictdef-mediasessionseekactiondetails", "dfnText": "MediaSessionSeekActionDetails", "refSections": [{"refs": [{"id": "ref-for-dictdef-mediasessionseekactiondetails"}, {"id": "ref-for-dictdef-mediasessionseekactiondetails\u2460"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};
 window.dfnpanelData['dictdef-mediasessionseektoactiondetails'] = {"dfnID": "dictdef-mediasessionseektoactiondetails", "url": "#dictdef-mediasessionseektoactiondetails", "dfnText": "MediaSessionSeekToActionDetails", "refSections": [{"refs": [{"id": "ref-for-dictdef-mediasessionseektoactiondetails"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};
 window.dfnpanelData['dictdef-mediasessioncaptureactiondetails'] = {"dfnID": "dictdef-mediasessioncaptureactiondetails", "url": "#dictdef-mediasessioncaptureactiondetails", "dfnText": "MediaSessionCaptureActionDetails", "refSections": [{"refs": [{"id": "ref-for-dictdef-mediasessioncaptureactiondetails"}, {"id": "ref-for-dictdef-mediasessioncaptureactiondetails\u2460"}, {"id": "ref-for-dictdef-mediasessioncaptureactiondetails\u2461"}], "title": "9. The\nMediaSessionActionDetails dictionary"}], "external": false};