Media Capture and Streams API (Media Stream)

該 API 基於MediaStream對象的操作，該對象代表與音頻或視頻相關的數據流。請參閱「獲取視頻」中的示例。

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 RTCPeerConnection 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 RTCPeerConnection API or a Web Audio API MediaStreamAudioSourceNode.

In these reference articles, you'll find the fundamental information you'll need to know about each of the interfaces that make up the Media Capture and Streams API.

• BlobEvent
• CanvasCaptureMediaStreamTrack
• InputDeviceInfo
• MediaDeviceKind
• MediaDeviceInfo
• MediaDevices
• MediaStream
• MediaStreamConstraints
• MediaStreamEvent
• MediaStreamTrack
• MediaStreamTrackEvent
• MediaTrackCapabilities
• MediaTrackConstraints
• MediaTrackSettings
• MediaTrackSupportedConstraints
• NavigatorUserMedia
• NavigatorUserMediaError
• OverconstrainedError
• URL

Early versions of the Media Capture and Streams API specification included separate AudioStreamTrack and VideoStreamTrack interfaces—each based upon MediaStreamTrack—which represented streams of those types. These no longer exist, and you should update any existing code to instead use MediaStreamTrack directly.

• addtrack
• ended
• mute
• overconstrained
• removetrack
• unmute

The articles below provide additional guidance and how-to information that will help you learn to use the API, and how to perform specific tasks that you may wish to handle.

• WebRTC -API 簡介頁
• mediaDevices.getUserMedia()
• 使用 WebRTC 拍攝靜態照片：有關使用getUserMedia()。