这篇翻译不完整。请帮忙从英语翻译这篇文章。
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。
The MediaStream Processing API, often called the Media Stream API or the Stream API, is the part of WebRTC describing a stream of audio or video data, the methods for working with them, the constraints associated with the type of data, the success and error callbacks when using the data asynchronously, and the events that are fired during the process.
基本概念
The API is based on the manipulation of a MediaStream object representing a flux of audio- or video-related data. Typically a MediaStream object is as a simple URL string which can be used to reference data stored in a DOM File, or a Blob object created with window.URL.createObjectURL(), as described in Get the video.
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
| 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()