MediaRecorder.requestData()
Метод MediaRecorder.requestData()
(часть MediaRecorder API) используется, чтобы поднять dataavailable
событие содержащее Blob
объект захваченных медиа-данных как это было когда метод был вызван. This can then be grabbed и манипулировать как необходимо.
When the requestData()
method is invoked, the browser queues a task that runs the following steps:
- If
MediaRecorder.state
is not "recording", raise a DOMInvalidState
error and terminate these steps. IfMediaRecorder.state
is "recording", continue to the next step. - Raise a
dataavailable
event containing aBlob
of the currently captured data (the Blob is available under the event'sdata
attribute.) - Create a new Blob and place subsequently captured data into it.
Syntax
MediaRecorder.requestData()
Errors
An InvalidState
error is raised if the requestData()
method is called while the MediaRecorder
object's MediaRecorder.state
is not "recording" — the media cannot be captured if recording is not occurring.
Example
js
...
captureMedia.onclick = function() {
mediaRecorder.requestData();
// makes snapshot available of data so far
// ondataavailable fires, then capturing continues
// in new Blob
}
...
Спецификации
Specification |
---|
MediaStream Recording # dom-mediarecorder-requestdata |
Совместимость с браузерами
BCD tables only load in the browser
Смотрите также
- Using the MediaRecorder API
- Web Dictaphone: MediaRecorder + getUserMedia + Web Audio API visualization demo, by Chris Mills (source on Github.)
- simpl.info MediaStream Recording demo, by Sam Dutton.
Navigator.getUserMedia