MediaStreamTrack

Summary

The MediaStreamTrack interface represents a media source in the User Agent, like video or audio tracks.

Properties

MediaStreamTrack.enabled

Is a Boolean value with a value of true if the track is enabled, that is allowed to render the media source stream; or false if it is disabled, that is not rendering the media source stream but silence and blackness. If the track has been disconnected, this value can be changed but has no more effect.

MediaStreamTrack.id Read only

Returns a DOMString containing a unique identifier (GUID) for the track; it is generated by the browser.

MediaStreamTrack.kind Read only

Returns a DOMString set to "audio" if the track is an audio track and to "video", if it is a video track. It doesn't change if the track is deassociated from its source.

MediaStreamTrack.label Read only

Returns a DOMString containing a user agent-assigned label that identifies the track source, as in "internal microphone". The string may be left empty and is empty as long as no source has been connected. When the track is deassociated from its source, the label is not changed.

MediaStreamTrack.muted Read only

Returns a Boolean value with a value of true if the track is muted, false otherwise.

MediaStreamTrack.readonly Read only

Returns a Boolean value with a value of true if the track is readonly (such a video file source or a camera that settings can't be modified),false otherwise.

MediaStreamTrack.readyState Read only

Returns an enumerated value giving the status of the track.It takes one of the following values:

"live" which indicates that an input is connected and does its best-effort in providing real-time data. In that case, the output of data can be switched on or off using the MediaStreamTrack.enabled attribute.
"ended" which indicates that the input is not giving any more data and will never provide new data.

MediaStreamTrack.remote Read only

Returns a boolean with a value of true if the track is sourced by a RTCPeerConnection, false otherwise.

Event handlers

MediaStreamTrack.onstarted: Is a EventHandler containing the action to perform when an started event is fired on the object, that is when a new MediaStreamTrack object is added.
MediaStreamTrack.onmute: Is a EventHandler containing the action to perform when an mute event is fired on the object, that is when the streaming is terminating.
MediaStreamTrack.onunmute: Is a EventHandler containing the action to perform when an unmute event is fired on the object, that is when a MediaStreamTrack object is removed from it.
MediaStreamTrack.onoverconstrained: Is a EventHandler containing the action to perform when an overconstrained event is fired on the object, that is when a MediaStreamTrack object is removed from it.
MediaStreamTrack.onended: Is a EventHandler containing the action to perform when an ended event is fired on the object, that is when a MediaStreamTrack object is removed from it.

Methods

MediaStreamTrack.getConstraints()
MediaStreamTrack.applyConstraints()
MediaStreamTrack.getSettings()
MediaStreamTrack.getCapabilities()
MediaStreamTrack.clone()
MediaStreamTrack.stop(): Stops playing the source associated to the track, both the source and the track are deassociated. The track state is set to ended.

Specifications

Specification	Status	Comment
Media Capture and Streams The definition of 'MediaStreamTrack' in that specification.	Editor's Draft	Initial definition

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	(Yes)	(Yes)	Not supported	Not supported	?
`stop()`	?	34 (34)	?	?	?
`muted`, `onmuted`, `onunmuted`, `readonly`, `readyState`, `remote`, `onstarted`, `onended`, `onoverconstrained`, `appendConstraint()`, `applyConstraints()`, `constraints()`, `getConstraints()`	?	Not supported	Not supported	Not supported	?

Feature	Android	Firefox Mobile (Gecko)	IE Phone	Opera Mobile	Safari Mobile
Basic support	?	(Yes)	Not supported	Not supported	?
`stop()`	?	34 (34)	?	?	?
`muted`, `onmuted`, `onunmuted`, `readonly`, `readyState`, `remote`, `onstarted`, `onended`, `onoverconstrained`, `appendConstraint()`, `applyConstraints()`, `constraints()`, `getConstraints()`	?	Not supported	Not supported	Not supported	?