This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
The MediaDevices
interface provides access to connected media input devices like cameras and microphones, as well as screen sharing. In essence, it lets you obtain access to any hardware source of media data.
Inherits properties from its parent EventTarget
.
MediaDevices.ondevicechange
devicechange
event. This event is delivered to the MediaDevices
object when a media input or output device is attached to or removed from the user's computer.Inherits methods from its parent EventTarget
.
EventTarget.addEventListener()
MediaDevices.enumerateDevices()
MediaDevices.getSupportedConstraints()
MediaTrackSupportedConstraints
indicating which constrainable properties are supported on the MediaStreamTrack
interface. See "Capabilities and constraints" in Media Capture and Streams API (Media Streams) to learn more about constraints and how to use them.MediaDevices.getUserMedia()
MediaStream
containing a video track and/or an audio track with the input.EventTarget.removeEventListener()
'use strict'; // Put variables in global scope to make them available to the browser console. var video = document.querySelector('video'); var constraints = window.constraints = { audio: false, video: true }; var errorElement = document.querySelector('#errorMsg'); navigator.mediaDevices.getUserMedia(constraints) .then(function(stream) { var videoTracks = stream.getVideoTracks(); console.log('Got stream with constraints:', constraints); console.log('Using video device: ' + videoTracks[0].label); stream.onended = function() { console.log('Stream ended'); }; window.stream = stream; // make variable available to browser console video.srcObject = stream; }) .catch(function(error) { if (error.name === 'ConstraintNotSatisfiedError') { errorMsg('The resolution ' + constraints.video.width.exact + 'x' + constraints.video.width.exact + ' px is not supported by your device.'); } else if (error.name === 'PermissionDeniedError') { errorMsg('Permissions have not been granted to use your camera and ' + 'microphone, you need to allow the page access to your devices in ' + 'order for the demo to work.'); } errorMsg('getUserMedia error: ' + error.name, error); }); function errorMsg(msg, error) { errorElement.innerHTML += '<p>' + msg + '</p>'; if (typeof error !== 'undefined') { console.error(error); } }
Specification | Status | Comment |
---|---|---|
Media Capture and Streams The definition of 'MediaDevices' in that specification. | Editor's Draft | Initial definition |
Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Microsoft Edge | Opera | Safari (WebKit) |
---|---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | 36.0 (36.0) | No support | ? | No support | No support |
enumerateDevices() | 51.0 | ? | ? | No support | ? | No support | No support |
getSupportedConstraints() | (Yes) | ? | 50 (50) | No support | ? | No support | No support |
ondevicechange and devicechange events | (Yes) | ? | 51 (51)[1] | No support | ? | No support | No support |
Feature | Android | Android Webview | Edge | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
---|---|---|---|---|---|---|---|---|---|
Basic support | No support | No support | (Yes) | 36.0 (36.0) | 2.2 | No support | No support | No support | No support |
enumerateDevices() | No support | No support | ? | ? | ? | No support | No support | No support | No support |
getSupportedConstraints() | No support | No support | ? | 50.0 (50) | ? | No support | No support | No support | No support |
[1] Support for the devicechange
event and for MediaDevices.ondevicechange
landed in Firefox 51, but only for Mac, and disabled by default. It can be enabled by setting the preference media.ondevicechange.enabled
to true
. Support for this event was added for Linux and Windows—and it was enabled by default—starting in Firefox 52.
Navigator.mediaDevices
: Returns a reference to a MediaDevices
object that can be used to access devices.
© 2005–2017 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices