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Purpose

In order to support screen sharing the client api needs enumerate screens and windows.  This api provided a list of screens (each monitor) and list of windows available; providing title, id and thumbnail.  This api is essentially equivalent of electron api: https://electron.atom.io/docs/api/desktop-capturer/#desktopcapturergetsourcesoptions-callback

getMediaSources API

ssf.getMediaSources(options, callback);

...

where DesktopSource (Object) is:

• id (String) - The identifier of a window or screen that can be used as a chromeMediaSourceId constraint when calling [navigator.webkitGetUserMedia]. The format of the identifier will be window:XX or screen:XX, where XX is a random generated number.

• name (String) - A screen source will be named either Entire Screen or Screen <index>, while the name of a window source will match the window title.

• thumbnail (String) - Base64 encoded png image.