Getusermedia

You are granted a license to use, reproduce and create derivative works of this document. This document defines a set of JavaScript APIs that allow local media, including audio and video, to be requested from a platform, getusermedia. This document defines APIs for requesting access to local multimedia devices, getusermedia, such as microphones or video cameras. This document also defines the MediaStream API, which provides the means to getusermedia where multimedia stream data is consumed, and provides getusermedia control over the devices that produce the media.

For many years we've had to rely on browser plugins Flash or Silverlight to get the job done. Come on! HTML5 to the rescue. It might not be apparent, but the rise of HTML5 has brought a surge of access to device hardware. These features are ridiculously powerful, exposing high level JavaScript APIs that sit on top of the system's underlying hardware capabilities.

Getusermedia

The getUserMedia method of the MediaDevices interface prompts the user for permission to use a media input which produces a MediaStream with tracks containing the requested types of media. It returns a Promise that resolves to a MediaStream object. Note: It's possible for the returned promise to neither resolve nor reject, as the user is not required to make a choice at all and may ignore the request. An object specifying the types of media to request, along with any requirements for each type. The constraints parameter is an object with two members: video and audio , describing the media types requested. Either or both must be specified. If the browser cannot find all media tracks with the specified types that meet the constraints given, then the returned promise is rejected with NotFoundError DOMException. For both video and audio , its value is either a boolean or an object. The default value is false. A Promise whose fulfillment handler receives a MediaStream object when the requested media has successfully been obtained.

If an object is specified for a media type, getusermedia, the object is read as a MediaTrackConstraints dictionary. A source is the "thing" providing the source getusermedia a media stream track.

Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time. The deprecated Navigator. If permission is denied, no compatible input devices exist, or any other error condition occurs, the error callback is executed with an object describing what went wrong. If the user instead doesn't make a choice at all, neither callback is executed.

You are granted a license to use, reproduce and create derivative works of this document. This document defines a set of JavaScript APIs that allow local media, including audio and video, to be requested from a platform. This document defines APIs for requesting access to local multimedia devices, such as microphones or video cameras. This document also defines the MediaStream API, which provides the means to control where multimedia stream data is consumed, and provides some control over the devices that produce the media. It also exposes information about devices able to capture and render media. This specification defines conformance criteria that apply to a single product: the User Agent that implements the interfaces that it contains.

Getusermedia

Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time. The deprecated Navigator. If permission is denied, no compatible input devices exist, or any other error condition occurs, the error callback is executed with an object describing what went wrong.

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The frame rate frames per second. The exact aspect ratio width in pixels divided by height in pixels, represented as a double rounded to the tenth decimal place or aspect ratio range. Let object be the ConstrainablePattern object on which new settings for one or more constrainable properties have changed. This is for backwards compatibility and legacy reasons. First, getUserMedia must always get user permission before opening any media gathering input such as a webcam or microphone. Otherwise, the user will never even be asked for permission to use the input devices. If the end of the track was reached due to a user request, the event source for this event is the user interaction event source. Constraints provide a general control surface that allows applications to both select an appropriate source for a track and, once selected, to influence how a source operates. Let candidates be the set of settings dictionaries for which the fitness distance is finite. The track is always enabled unless stated otherwise for example when cloned and the muted state reflects the state of the source at the time the track is created. Other specifications may define constrainable properties that at times must not be exposed. See Security for more information on this and other security issues related to using getUserMedia. Other specifications can define the algorithm for specific device types. To use the webcam or microphone, we need to request permission. It is recommended to look at existing implementations to select meaningful default values.

This is a legacy method. Please use the newer navigator.

A function which is invoked when the request for media access is approved. Settings is a dictionary containing one or more key-value pairs. To get an audio stream you would ask for the audio media object too, and call stream. A source can be a physical webcam, microphone, local video or audio file from the user's hard drive, network resource, or static image. Their sole purpose? In this case, the constrainable object is a video source with a very limited set of Capabilities. There are cases where it is not needed and it is desirable to turn it off so that the audio is not altered. Warning: the navigator object exposes a getUserMedia method as well, which might still work but is deprecated. The ideal values are still given for width and height, but this time with minimum requirements on each as well as a minimum frameRate that must be satisfied. An implementation may use a per-source reference count to keep track of source usage, but the specifics are out of scope for this specification. Generally, you will access the MediaDevices singleton object using navigator. This is particularly relevant for video width and height, since the ranges for width and height are reported separately. Each member of a ConstraintSet corresponds to a constrainable property and specifies a subset of the property's valid Capability values.