MediaStreamConstraints

MediaStreamConstraints dictionary is used when calling getUserMedia() to specify what kinds of tracks should be included in the returned MediaStream , and, optionally, to establish constraints for those tracks' settings.

To learn more about how constraints work, see Capabilities, constraints, and settings .

特性

Some combination—but not necessarily all—of the following properties will exist on the object.

Track constraints

audio
Either a Boolean (which indicates whether or not an audio track is requested) or a MediaTrackConstraints object providing the constraints which must be met by the audio track included in the returned MediaStream . If constraints are specified, an audio track is inherently requested.
video
Either a Boolean (which indicates whether or not a video track is requested) or a MediaTrackConstraints object providing the constraints which must be met by the video track included in the returned MediaStream . If constraints are specified, a video track is inherently requested.

Security

peerIdentity
A DOMString identifying the peer who has sole access to the stream. If this property is specified, only the indicated peer can receive and use the stream. Streams isolated in this way can only be displayed in a media element ( <audio> or <video> ) where the content is protected just as if CORS cross-origin rules were in effect. When a peer identity is set, MediaStreamTrack s from that peer have their isolated flag set to true .

浏览器兼容性

更新 GitHub 上的兼容性数据
Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
MediaStreamConstraints Chrome 53 Edge ≤79 Firefox 38 IE No Opera Yes Safari ? WebView Android 53 Chrome Android 53 Firefox Android 38 Opera Android Yes Safari iOS ? Samsung Internet Android 6.0
audio Chrome Yes Edge ≤79 Firefox 38 IE No Opera Yes Safari ? WebView Android Yes Chrome Android Yes Firefox Android 38 Opera Android Yes Safari iOS ? Samsung Internet Android Yes
video Chrome Yes Edge ≤79 Firefox 38 IE No Opera Yes Safari ? WebView Android Yes Chrome Android Yes Firefox Android 38 Opera Android Yes Safari iOS ? Samsung Internet Android Yes

图例

完整支持
完整支持
不支持
不支持
兼容性未知
兼容性未知

另请参阅