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这是一个实验中的功能
此功能某些浏览器尚在开发中，请参考浏览器兼容性表格以得到在不同浏览器中适合使用的前缀。由于该功能对应的标准文档可能被重新修订，所以在未来版本的浏览器中该功能的语法和行为可能随之改变。
MediaStream处理API（通常被称为媒体流API或流API）是描述音频或视频数据流的WebRTC的一部分，处理它们的方法，与数据类型相关的约束，成功和错误 当异步使用数据时的回调以及在处理期间触发的事件。
基本概念
这个API是基于操纵一个 MediaStream 对象代表音频或视频相关数据的流量。 通常一个 MediaStream是作为一个简单的URL string 它可以用来引用存储在DOM中的数据 File, 或者一个 Blob 对象建立 window.URL.createObjectURL(), 如视频所描述的。
A MediaStream consists of zero or more MediaStreamTrack objects, representing various audio or video tracks. Each MediaStreamTrack may have one or more channels. The channel represents the smallest unit of a media stream, such as an audio signal associated with a given speaker, like left or right in a stereo audio track.
MediaStream objects have a single input and a single output. A MediaStream object generated by getUserMedia() is called local, and has as its source input one of the user's cameras or microphones. A non-local MediaStream may be representing to a media element, like <video> or <audio>, a stream originating over the network, and obtained via the WebRTC PeerConnection API, or a stream created using the Web Audio API MediaStreamAudioSourceNode. The output of the MediaStream object is linked to a consumer. It can be a media elements, like <audio> or <video>, the WebRTC PeerConnection API or a Web Audio API MediaStreamAudioDestinationNode.
参考
addtrack(event)AudioStreamTrackBlobEventended (MediaStream)(event)ended (MediaStreamTrack)(event)MediaStreamMediaStreamConstraintsMediaStreamTrackMediaStreamTrackEventMediaTrackConstraintsmuted(event)NavigatorUserMediaNavigatorUserMediaErroroverconstrained(event)removetrack(event)started(event)unmuted(event)URLVideoStreamTrack
浏览器支持
We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Stream API | 21webkit | nightly 18moz | ? | 12 | ? |
| Feature | Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Stream API | 未实现 | ? | ? | 未实现 | 未实现 |
Currently using WebRTC for accessing the camera is supported in Chrome, Opera and Firefox Nightly 18. Enabling WebRTC in Firefox Nightly requires you to set a flag in the configuration:
- Type "about:config" in the address bar and say yes that you want to make changes
- Find the "media.navigator.enabled" entry and set it to true
See Also
- WebRTC - the introductory page to the API
- getUserMedia()
- Taking webcam photos - a tutorial on using getUserMedia()