Add video conferencing actions to the spec

index.bs

@@ -436,6 +436,18 @@ conforming IDL fragments, as described in the Web IDL specification. [[!WEBIDL]]
           <dfn enum-value for=MediaSessionAction>seekto</dfn>: the action's intent
           is to move the playback time to a specific time.
         </li>
+        <li>
+          <dfn enum-value for=MediaSessionAction>togglemicrophone</dfn>: the action's intent
+          is to mute or unmute the user's microphone.
+        </li>
+        <li>
+          <dfn enum-value for=MediaSessionAction>togglecamera</dfn>: the action's intent
+          is to turn the user's active camera on or off.
+        </li>
+        <li>
+          <dfn enum-value for=MediaSessionAction>hangup</dfn>: the action's intent
+          is to end a call.
+        </li>
       </ul>
     </p>
 
@@ -541,6 +553,14 @@ conforming IDL fragments, as described in the Web IDL specification. [[!WEBIDL]]
       provided for the <a>active media session</a>.
     </p>
 
+    <p>
+      A user agent MAY implement a default handler for the <a enum-value
+      for=MediaSessionAction>togglemicrophone</a>, <a enum-value
+      for=MediaSessionAction>togglecamera</a>, or <a enum-value
+      for=MediaSessionAction>hangup</a> <a>media session actions</a> if none was
+      provided for the <a>active media session</a>.
+    </p>
+
     <p class=note>
       A page should only register a {{MediaSessionActionHandler}} for a <a>media
       session action</a> when it can handle the action given that the user agent
@@ -708,7 +728,10 @@ enum MediaSessionAction {
   "nexttrack",
   "skipad",
   "stop",
-  "seekto"
+  "seekto",
+  "togglemicrophone",
+  "togglecamera",
+  "hangup"
 };
 
 callback MediaSessionActionHandler = undefined(MediaSessionActionDetails details);
@@ -722,6 +745,10 @@ interface MediaSession {
   undefined setActionHandler(MediaSessionAction action, MediaSessionActionHandler? handler);
 
   undefined setPositionState(optional MediaPositionState state = {});
+
+  undefined setMicrophoneActive(boolean active);
+
+  undefined setCameraActive(boolean active);
 };
 </pre>
 
@@ -856,6 +883,20 @@ interface MediaSession {
   </ul>
 </p>
 
+<p>
+  The <dfn method for=MediaSession>setMicrophoneActive(active)</dfn> and
+  <dfn method for=MediaSession>setCameraActive(active)</dfn> methods indicate to
+  the user agent whether the microphone and camera are currently considered by
+  the page to be active (e.g. if the microphone is considered "muted" by the
+  page since it is no longer sending audio through to a call, then the page can
+  invoke <code>setMicrophoneActive(false)</code>). The user agent MAY display UI
+  which invoke the handlers for the <a enum-value
+  for=MediaSessionAction>togglemicrophone</a> and <a enum-value
+  for=MediaSessionAction>togglecamera</a> <a>media session actions</a>, and
+  it is RECOMMENDED that the user agent respect the microphone and camera
+  states indicated by the page in this UI.
+</p>
+
 <h2 id="the-mediametadata-interface">The {{MediaMetadata}} interface</h2>
 
 <pre class="idl">
@@ -1406,6 +1447,41 @@ When the <a>media session action</a> is
   </pre>
 </div>
 
+<div class="example" id="example-microphone-camera-hangup">
+  Using video conferencing actions:
+  <pre class="lang-javascript">
+    var isMicrophoneActive = false;
+    var isCameraActive = false;
+
+    navigator.mediaSession.setMicrophoneActive(isMicrophoneActive);
+    navigator.mediaSession.setCameraActive(isCameraActive);
+
+    navigator.mediaSession.setActionHandler("togglemicrophone", function() {
+      if (isMicrophoneActive) {
+        // Mute the microphone. Implementation omitted.
+      } else {
+        // Unmute the microphone. Implementation omitted.
+      }
+      isMicrophoneActive = !isMicrophoneActive;
+      navigator.mediaSession.setMicrophoneActive(isMicrophoneActive);
+    });
+
+    navigator.mediaSession.setActionHandler("togglecamera", function() {
+      if (isCameraActive) {
+        // Disable the camera. Implementation omitted.
+      } else {
+        // Enable the camera. Implementation omitted.
+      }
+      isCameraActive = !isCameraActive;
+      navigator.mediaSession.setCameraActive(isCameraActive);
+    });
+
+    navigator.mediaSession.setActionHandler("hangup", function() {
+      // End the call. Implementation omitted.
+    });
+  </pre>
+</div>
+
 <h2 id="acknowledgments" class="no-num">Acknowledgments</h2>
 
 The editors would like to thank Paul Adenot, Jake Archibald, Tab Atkins,