How to cancel chooseDesktopMedia?

Question

In my web page, there is a screen sharing stream, the following are the parameters:

{
    audio: false,
    video: mandatory {
               chromeMediaSource: 'desktop',
               chromeMediaSourceId: IM.screenSourceId
              ...
           }
     ...
}

My Chrome extension contains the following code in the background script:

desktop_id = chrome.desktopCapture.chooseDesktopMedia (session, port.sender.tab, onAccessApproved);

When click the "Cancel" button on the page, the listener function in the background script is triggered:

chrome.desktopCapture.cancelChooseDesktopMedia (desktop_id);

In chrome://extensions of console.log to see desktop_id really is an integer value of 1.

But it seems does not work, I tried many Chrome versions but it still does not work, what should I do to cancel the screen sharing?

Answer 1

chrome.desktopCapture.cancelChooseDesktopMedia closes the chooser dialog if it is still open. It does NOT stop the media stream after the user has choosen a target for recording.

If you want to stop recording the screen, call the .stop() method of the media stream instead. E.g.

navigator.webkitGetUserMedia({
    audio: false,
    video: {
        mandatory: {
            chromeMediaSource: 'desktop',
            chromeMediaSourceId: IM.screenSourceId
        }   
    }   
}, function onSuccess(stream) {
    // Example: end the recording after 10 seconds.
    setTimeout(function() {
        stream.stop();
    }, 10000);
}, function onError() {
    // Handle error
});