9 chromeMediaSource: 'screen',
10 getSourceId: function (callback) {
11 screenCallback = callback;
12 window.postMessage('get-sourceId', '*');
14 onMessageCallback: function (data) {
15 // "cancel" button is clicked
16 if (data == 'PermissionDeniedError') {
17 DetectRTC.screen.chromeMediaSource = 'PermissionDeniedError';
18 if (screenCallback) return screenCallback('PermissionDeniedError');
19 else throw new Error('PermissionDeniedError');
22 // extension notified his presence
23 if (data == 'rtcmulticonnection-extension-loaded') {
24 DetectRTC.screen.chromeMediaSource = 'desktop';
27 // extension shared temp sourceId
29 DetectRTC.screen.sourceId = data.sourceId;
30 if (screenCallback) screenCallback(DetectRTC.screen.sourceId);
33 getChromeExtensionStatus: function (callback) {
34 // https://chrome.google.com/webstore/detail/screen-capturing-private/icgmlogfeajbfdffajhoebcfbibfhaen
35 var extensionid = 'icgmlogfeajbfdffajhoebcfbibfhaen';
37 var image = document.createElement('img');
38 image.src = 'chrome-extension://' + extensionid + '/icon.png';
39 image.onload = function () {
40 DetectRTC.screen.chromeMediaSource = 'screen';
41 window.postMessage('are-you-there', '*');
42 setTimeout(function () {
43 if (DetectRTC.screen.chromeMediaSource == 'screen') {
44 callback('installed-disabled');
45 } else callback('installed-enabled');
48 image.onerror = function () {
49 callback('not-installed');
54 window.addEventListener('message', function (event) {
55 if (!event.data || !(typeof event.data == 'string' || event.data.sourceId || event.data.captureSourceId)) return;
56 if (event.data.captureSourceId) captureSourceId();
58 DetectRTC.screen.onMessageCallback(event.data);
61 function captureSourceId() {
62 // check if desktop-capture extension installed.
63 DetectRTC.screen.getChromeExtensionStatus(function (status) {
64 if (status != 'installed-enabled') {
65 window.parent.postMessage({
66 chromeExtensionStatus: status
71 DetectRTC.screen.getSourceId(function (sourceId) {
72 window.parent.postMessage({
73 chromeMediaSourceId: sourceId