MediaRecorder.ondataavailable

MediaRecorder.ondataavailable обработчик события (часть MediaStream Recording API) обрабатывает dataavailable событие, позволяет выполнить код в ответ на Blob данные доступные для использования.

Событие dataavailable вызывается когда MediaRecorder доставляет медиа-данные в ваше приложение для использования. Данные предоставляются в Blob объекте. Это происходит в четырёх ситуациях:

• Когда медиа-поток завершён, любые мультимедийные данные ещё не доставленные в обработчик ondataavailable передаются в одном Blob.
• When MediaRecorder.stop() is called, all media data which has been captured since recording began or the last time a dataavailable event occurred is delivered in a Blob; after this, capturing ends.
• When MediaRecorder.requestData() is called, all media data which has been captured since recording began or the last time a dataavailable event occurred is delivered; then a new Blob is created and media capture continues into that blob.
• If a timeslice property was passed into the MediaRecorder.start() method that started media capture, a dataavailable event is fired every timeslice milliseconds. That means that each blob will have a specific time duration (except the last blob, which might be shorter, since it would be whatever is left over since the last event). So if the method call looked like this — recorder.start(1000); — the dataavailable event would fire after each second of media capture, and our event handler would be called every second with a blob of media data that's one second long. You can use timeslice alongside MediaRecorder.stop() and MediaRecorder.requestData() to produce multiple same-length blobs plus other shorter blobs as well.

Syntax

MediaRecorder.ondataavailable = function(event) { ... }
MediaRecorder.addEventListener('dataavailable', function(event) { ... })

Example

...

  mediaRecorder.onstop = function(e) {
    console.log("data available after MediaRecorder.stop() called.");

    var audio = document.createElement('audio');
    audio.controls = true;
    var blob = new Blob(chunks, { 'type' : 'audio/ogg; codecs=opus' });
    var audioURL = window.URL.createObjectURL(blob);
    audio.src = audioURL;
    console.log("recorder stopped");
  }

  mediaRecorder.ondataavailable = function(e) {
    chunks.push(e.data);
  }

...

Specifications

Browser compatibility

[1] The intial Firefox OS implementation only supported audio recording.

[2] To try this feature on Chrome, enable Experimental Web Platform features from chrome://flags . Currently only video is supported, not audio.

See also

• Using the MediaStream Recording 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