79 lines
2.7 KiB
Markdown
79 lines
2.7 KiB
Markdown
# desktopCapturer
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The `desktopCapturer` module can be used to get available sources that can be
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used to be captured with `getUserMedia`.
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```javascript
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// In the renderer process.
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var desktopCapturer = require('electron').desktopCapturer;
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desktopCapturer.getSources({types: ['window', 'screen']}, function(error, sources) {
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if (error) throw error;
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for (var i = 0; i < sources.length; ++i) {
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if (sources[i].name == "Electron") {
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navigator.webkitGetUserMedia({
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audio: false,
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video: {
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mandatory: {
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chromeMediaSource: 'desktop',
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chromeMediaSourceId: sources[i].id,
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minWidth: 1280,
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maxWidth: 1280,
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minHeight: 720,
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maxHeight: 720
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}
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}
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}, gotStream, getUserMediaError);
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return;
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}
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}
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});
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function gotStream(stream) {
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document.querySelector('video').src = URL.createObjectURL(stream);
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}
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function getUserMediaError(e) {
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console.log('getUserMediaError');
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}
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```
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When creating a constraints object for the `navigator.webkitGetUserMedia` call,
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if you are using a source from `desktopCapturer` your `chromeMediaSource` must
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be set to `"desktop"` and your `audio` must be set to `false`.
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If you wish to
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capture the audio and video from the entire desktop you can set
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`chromeMediaSource` to `"screen"` and `audio` to `true`. When using this method
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you cannot specify a `chromeMediaSourceId`.
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## Methods
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The `desktopCapturer` module has the following methods:
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### `desktopCapturer.getSources(options, callback)`
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* `options` Object
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* `types` Array - An array of String that lists the types of desktop sources
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to be captured, available types are `screen` and `window`.
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* `thumbnailSize` Object (optional) - The suggested size that thumbnail should
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be scaled, it is `{width: 150, height: 150}` by default.
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* `callback` Function
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Starts a request to get all desktop sources, `callback` will be called with
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`callback(error, sources)` when the request is completed.
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The `sources` is an array of `Source` objects, each `Source` represents a
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captured screen or individual window, and has following properties:
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* `id` String - The id of the captured window or screen used in
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`navigator.webkitGetUserMedia`. The format looks like `window:XX` or
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`screen:XX` where `XX` is a random generated number.
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* `name` String - The described name of the capturing screen or window. If the
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source is a screen, the name will be `Entire Screen` or `Screen <index>`; if
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it is a window, the name will be the window's title.
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* `thumbnail` [NativeImage](NativeImage.md) - A thumbnail image.
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**Note:** There is no guarantee that the size of `source.thumbnail` is always
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the same as the `thumnbailSize` in `options`. It also depends on the scale of
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the screen or window.
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