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/Electron

desktopCapturer

Access information about media sources that can be used to capture audio and video from the desktop using the navigator.webkitGetUserMedia API.

Process: Renderer

The following example shows how to capture video from a desktop window whose title is Electron:

// In the renderer process.
const {desktopCapturer} = require('electron')

desktopCapturer.getSources({types: ['window', 'screen']}, (error, sources) => {
  if (error) throw error
  for (let i = 0; i < sources.length; ++i) {
    if (sources[i].name === 'Electron') {
      navigator.webkitGetUserMedia({
        audio: false,
        video: {
          mandatory: {
            chromeMediaSource: 'desktop',
            chromeMediaSourceId: sources[i].id,
            minWidth: 1280,
            maxWidth: 1280,
            minHeight: 720,
            maxHeight: 720
          }
        }
      }, handleStream, handleError)
      return
    }
  }
})

function handleStream (stream) {
  document.querySelector('video').src = URL.createObjectURL(stream)
}

function handleError (e) {
  console.log(e)
}

To capture video from a source provided by desktopCapturer the constraints passed to navigator.webkitGetUserMedia must include chromeMediaSource: 'desktop', and audio: false.

To capture both audio and video from the entire desktop the constraints passed to navigator.webkitGetUserMedia must include chromeMediaSource: 'screen', and audio: true, but should not include a chromeMediaSourceId constraint.

Methods

The desktopCapturer module has the following methods:

desktopCapturer.getSources(options, callback)

  • options Object
    • types String[] - An array of Strings that lists the types of desktop sources to be captured, available types are screen and window.
    • thumbnailSize Size (optional) - The size that the media source thumbnail should be scaled to. Default is 150 x 150.
  • callback Function

Starts gathering information about all available desktop media sources, and calls callback(error, sources) when finished.

sources is an array of DesktopCapturerSource objects, each DesktopCapturerSource represents a screen or an individual window that can be captured.

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Licensed under the MIT license.
https://electron.atom.io/docs/api/desktop-capturer/