This is an experimental technology
Because this technology‘s specification has not stabilized, check the compatibility table for the proper prefixes to use 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 spec changes.
The MediaStream interface represents a stream of media content. A stream consists of several tracks, like video or audio tracks.
MediaStream.ended Read onlytrue if the ended event has been fired on the object, meaning that the stream has been completely read, or false if the end of hte stream has not been reached.MediaStream.id Read onlyDOMString containing 36 characters denoting a unique identifier (GUID) for the object.MediaStream.onaddtrackEventHandler containing the action to perform when an addtrack event is fired on the object, that is when a new MediaStreamTrack object is added.MediaStream.onendedEventHandler containing the action to perform when an ended event is fired on the object, that is when the streaming is terminating.MediaStream.onremovetrackEventHandler containing the action to perform when an removetrack event is fired on the object, that is when a MediaStreamTrack object is removed from it.MediaStream.addTrack()MediaStreamTrack given as argument. If the track has already been added to the MediaStream object, nothing happens; if the track is in the finished state, that is has already reached its end, the exception INVALID_STATE_RAISE is raised.MediaStream.clone()MediaStream objet. The clone will have a new id value.trackid. If no parameter is given, or if no track with that id does exists, it returns null. If several tracks have the same id, it returns the first one.MediaStream.getAudioTracks()MediaStreamTrack stored in the MediaStream object that have their kind attribute set to "audio". The order is not defined, and may vary from one browser to an other, but also from one call to the method to another.MediaStream.getTrackById()trackid. If no parameter is given, or if no track with that id does exists, it returns null. If several tracks have the same id, it returns the first one.MediaStream.getVideoTracks()MediaStreamTrack stored in the MediaStream object that have their kind attribute set to "video". The order is not defined, and may vary from one browser to an other, but also from one call to the method to another.MediaStream.removeTrack()MediaStreamTrack given as argument. If the track is not part of the MediaStream object, nothing happens; if the track is in the finished state, that is has already reached its end, the exception INVALID_STATE_RAISE is raised.The MediaStream interface represents a stream of media content. A stream consists of several tracks, like video or audio tracks.
MediaStreamTrack.enabledtrue 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 onlyDOMString containing a unique identifier (GUID) for the track; it is generated by the browser.MediaStreamTrack.kind Read onlyDOMString 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 onlyDOMString 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 onlytrue if the track is muted, false otherwise.MediaStreamTrack.readonly Read onlytrue 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"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 theMediaStreamTrack.enabled attribute."ended" which indicates that the input is not giving any more data and will never provide new data.MediaStreamTrack.remote Read onlytrue if the track is sourced by a RTCPeerConnection, falseotherwise.MediaStreamTrack.onstartedEventHandler containing the action to perform when an started event is fired on the object, that is when a new MediaStreamTrack object is added.MediaStreamTrack.onmuteEventHandler containing the action to perform when an mute event is fired on the object, that is when the streaming is terminating.MediaStreamTrack.onunmuteEventHandler 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.onoverconstrainedEventHandler 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.oneendedEventHandler containing the action to perform when an ended event is fired on the object, that is when a MediaStreamTrack object is removed from it.MediaStreamTrack.getConstraints()MediaStreamTrack.applyConstraints()MediaStreamTrack.getSettings()MediaStreamTrack.getCapabilities()MediaStreamTrack.clone()MediaStreamTrack.stop()ended.
| Specification | Status | Comment |
|---|---|---|
| Media Capture and Streams The definition of ‘MediaStreamTrack‘ in that specification. |
Candidate Recommendation | Initial definition |
https://developer.mozilla.org/en-US/docs/Web/API/MediaStreamTrack
https://developer.mozilla.org/en-US/docs/Web/API/MediaStream
webrtc学习——mediaStream和MediaStreamTrack
原文：http://www.cnblogs.com/xiaoerhei/p/4073706.html