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A API de Media Capture and Streams, muitas vezes chamada de Media Stream API ou Stream API, é uma API relacionada com WebRTC que suporta transmissões de dados de áudio ou vídeo, os métodos para trabalhar com eles, as restrições associadas com o tipo de dados, as devoluções de retorno de sucesso e erro quando utilizar os dados de forma assíncrona, e os eventos que foram ativados durante o processo.
Conceitos básicos
The API is based on the manipulation of a MediaStream object representing a flux of audio- or video-related data. See an example 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 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 MediaStreamAudioDestinationNode.
Referência
addtrack(event)AudioStreamTrackBlobEventended(event)MediaStreamMediaStreamTrackMediaStreamTrackEventMediaTrackCapabilitiesMediaTrackConstraintsMediaTrackSettingsMediaTrackSupportedConstraintsmuted(event)NavigatorUserMediaNavigatorUserMediaErroroverconstrained(event)removetrack(event)started(event)unmuted(event)URLVideoStreamTrack
Guias e tutoriais
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Compatibilidade de navegador
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!
| Funcionalidade | Chrome | Firefox (Gecko) | Edge | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|---|
| Stream API | 21webkit | Nightly 18moz | (Yes) | ? | 12 | ? |
| Funcionalidade | Android | Edge | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| API de emissão | No support | (Yes) | ? | ? | No support | No support |
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
Consulte também
- WebRTC - a página introdutória para a API
mediaDevices.getUserMedia()- Tirar fotografias com a câmara da Web: tutorial sobre como utilizar
getUserMedia().