Revision 1132247 of MediaTrackSettings.facingMode

<div>{{APIRef("Media Capture and Streams")}}</div>

<p>The {{domxref("MediaTrackSettings")}} dictionary's <code><strong>facingMode</strong></code> property is {{domxref("DOMString")}} indicating the direction in which the camera producing the video track represented by the {{domxref("MediaStreamTrack")}} is currently facing. This lets you determine what value was selected to comply with your specified constraints for this property's value as described in the {{domxref("MediaTrackConstraints.facingMode")}} property you provided when calling either {{domxref("MediaDevices.getUserMedia", "getUserMedia()")}} or {{domxref("MediaStreamTrack.applyConstraints()")}}.</p>

<p>If needed, you can determine whether or not this constraint is supported by checking the value of {{domxref("MediaTrackSupportedConstraints.facingMode")}} as returned by a call to {{domxref("MediaDevices.getSupportedConstraints()")}}. However, typically this is unnecessary since browsers will simply ignore any constraints they're unfamiliar with.</p>

<h2 id="Syntax">Syntax</h2>

<pre class="syntaxbox">
var <em>facingMode</em> = <em>MediaTrackSettings</em>.facingMode;
</pre>

<h3 id="Value">Value</h3>

<p>A {{domxref("DOMString")}} whose value is one of the strings in <code>{{anch("VideoFacingModeEnum")}}</code>.</p>

<h3>VideoFacingModeEnum</h3>

<p>The following strings are permitted values for the facing mode. These may represent separate cameras, or they may represent directions in which an adjustable camera can be pointed.</p>

<dl>
 <dt><code>"user"</code></dt>
 <dd>The video source is facing toward the user; this includes, for example, the front-facing camera on a smartphone.</dd>
 <dt><code>"environment"</code></dt>
 <dd>The video source is facing away from the user, thereby viewing their environment. This is the back camera on a smartphone.</dd>
 <dt><code>"left"</code></dt>
 <dd>The video source is facing toward the user but to their left, such as a camera aimed toward the user but over their left shoulder.</dd>
 <dt><code>"right"</code></dt>
 <dd>The video source is facing toward the user but to their right, such as a camera aimed toward the user but over their right shoulder.</dd>
</dl>

<h2 id="Example" name="Example">Example</h2>

<p>See {{SectionOnPage("/en-US/docs/Web/API/Media_Streams_API/Constraints", "Example: Constraint exerciser")}} for an example.</p>

<h2 id="Specifications">Specifications</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>{{ SpecName('Media Capture', '#widl-MediaTrackSettings-facingMode', 'facingMode') }}</td>
   <td>{{ Spec2('Media Capture') }}</td>
   <td>Initial specification.</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>

<p>{{CompatibilityTable}}</p>

<div id="compat-desktop">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Chrome</th>
   <th>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatGeckoDesktop(36)}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Android</th>
   <th>Android Webview</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>IE Mobile</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
   <th>Chrome for Android</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatGeckoMobile(36)}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<h2 id="See_also">See also</h2>

<ul>
 <li><a href="/en-US/docs/Web/API/Media_Streams_API">Media Capture and Streams API</a></li>
 <li><a href="/en-US/docs/Web/API/Media_Streams_API/Constraints">Capabilities, constraints, and settings</a></li>
 <li>{{domxref("MediaTrackConstraints.facingMode")}}</li>
 <li>{{domxref("MediaTrackSettings")}}</li>
</ul>