318 lines
10 KiB
JavaScript
318 lines
10 KiB
JavaScript
/* global $, config, connection, chrome, alert, getUserMediaWithConstraints, changeLocalVideo, getConferenceHandler */
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/**
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* Indicates that desktop stream is currently in use(for toggle purpose).
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* @type {boolean}
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*/
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var isUsingScreenStream = false;
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/**
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* Indicates that switch stream operation is in progress and prevent from triggering new events.
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* @type {boolean}
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*/
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var switchInProgress = false;
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/**
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* Method used to get screen sharing stream.
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*
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* @type {function (stream_callback, failure_callback}
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*/
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var obtainDesktopStream = null;
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/**
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* Flag used to cache desktop sharing enabled state. Do not use directly as it can be <tt>null</tt>.
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* @type {null|boolean}
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*/
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var _desktopSharingEnabled = null;
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/**
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* Method obtains desktop stream from WebRTC 'screen' source.
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* Flag 'chrome://flags/#enable-usermedia-screen-capture' must be enabled.
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*/
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function obtainWebRTCScreen(streamCallback, failCallback) {
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getUserMediaWithConstraints(
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['screen'],
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streamCallback,
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failCallback
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);
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}
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/**
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* Constructs inline install URL for Chrome desktop streaming extension.
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* The 'chromeExtensionId' must be defined in config.js.
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* @returns {string}
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*/
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function getWebStoreInstallUrl()
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{
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return "https://chrome.google.com/webstore/detail/" + config.chromeExtensionId;
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}
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/**
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* Checks whether extension update is required.
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* @param minVersion minimal required version
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* @param extVersion current extension version
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* @returns {boolean}
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*/
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function isUpdateRequired(minVersion, extVersion)
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{
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try
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{
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var s1 = minVersion.split('.');
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var s2 = extVersion.split('.');
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var len = Math.max(s1.length, s2.length);
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for (var i = 0; i < len; i++)
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{
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var n1 = 0,
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n2 = 0;
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if (i < s1.length)
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n1 = parseInt(s1[i]);
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if (i < s2.length)
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n2 = parseInt(s2[i]);
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if (isNaN(n1) || isNaN(n2))
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{
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return true;
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}
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else if (n1 !== n2)
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{
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return n1 > n2;
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}
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}
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// will happen if boths version has identical numbers in
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// their components (even if one of them is longer, has more components)
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return false;
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}
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catch (e)
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{
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console.error("Failed to parse extension version", e);
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messageHandler.showError('Error',
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'Error when trying to detect desktopsharing extension.');
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return true;
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}
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}
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function checkExtInstalled(isInstalledCallback) {
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if (!chrome.runtime) {
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// No API, so no extension for sure
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isInstalledCallback(false);
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return;
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}
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chrome.runtime.sendMessage(
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config.chromeExtensionId,
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{ getVersion: true },
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function (response) {
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if (!response || !response.version) {
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// Communication failure - assume that no endpoint exists
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console.warn("Extension not installed?: " + chrome.runtime.lastError);
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isInstalledCallback(false);
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} else {
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// Check installed extension version
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var extVersion = response.version;
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console.log('Extension version is: ' + extVersion);
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var updateRequired = isUpdateRequired(config.minChromeExtVersion, extVersion);
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if (updateRequired) {
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alert(
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'Jitsi Desktop Streamer requires update. ' +
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'Changes will take effect after next Chrome restart.');
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}
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isInstalledCallback(!updateRequired);
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}
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}
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);
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}
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function doGetStreamFromExtension(streamCallback, failCallback) {
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// Sends 'getStream' msg to the extension. Extension id must be defined in the config.
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chrome.runtime.sendMessage(
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config.chromeExtensionId,
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{ getStream: true, sources: config.desktopSharingSources },
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function (response) {
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if (!response) {
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failCallback(chrome.runtime.lastError);
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return;
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}
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console.log("Response from extension: " + response);
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if (response.streamId) {
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getUserMediaWithConstraints(
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['desktop'],
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function (stream) {
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streamCallback(stream);
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},
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failCallback,
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null, null, null,
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response.streamId);
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} else {
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failCallback("Extension failed to get the stream");
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}
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}
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);
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}
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/**
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* Asks Chrome extension to call chooseDesktopMedia and gets chrome 'desktop' stream for returned stream token.
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*/
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function obtainScreenFromExtension(streamCallback, failCallback) {
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checkExtInstalled(
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function (isInstalled) {
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if (isInstalled) {
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doGetStreamFromExtension(streamCallback, failCallback);
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} else {
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chrome.webstore.install(
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getWebStoreInstallUrl(),
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function (arg) {
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console.log("Extension installed successfully", arg);
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// We need to reload the page in order to get the access to chrome.runtime
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window.location.reload(false);
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},
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function (arg) {
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console.log("Failed to install the extension", arg);
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failCallback(arg);
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messageHandler.showError('Error',
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'Failed to install desktop sharing extension');
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}
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);
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}
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}
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);
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}
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/**
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* @returns {boolean} <tt>true</tt> if desktop sharing feature is available and enabled.
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*/
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function isDesktopSharingEnabled() {
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if (_desktopSharingEnabled === null) {
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if (obtainDesktopStream === obtainScreenFromExtension) {
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// Parse chrome version
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var userAgent = navigator.userAgent.toLowerCase();
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// We can assume that user agent is chrome, because it's enforced when 'ext' streaming method is set
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var ver = parseInt(userAgent.match(/chrome\/(\d+)\./)[1], 10);
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console.log("Chrome version" + userAgent, ver);
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_desktopSharingEnabled = ver >= 34;
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} else {
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_desktopSharingEnabled = obtainDesktopStream === obtainWebRTCScreen;
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}
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}
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return _desktopSharingEnabled;
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}
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function showDesktopSharingButton() {
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if (isDesktopSharingEnabled()) {
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$('#desktopsharing').css({display: "inline"});
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} else {
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$('#desktopsharing').css({display: "none"});
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}
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}
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/**
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* Call this method to toggle desktop sharing feature.
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* @param method pass "ext" to use chrome extension for desktop capture(chrome extension required),
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* pass "webrtc" to use WebRTC "screen" desktop source('chrome://flags/#enable-usermedia-screen-capture'
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* must be enabled), pass any other string or nothing in order to disable this feature completely.
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*/
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function setDesktopSharing(method) {
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// Check if we are running chrome
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if (!navigator.webkitGetUserMedia) {
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obtainDesktopStream = null;
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console.info("Desktop sharing disabled");
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} else if (method == "ext") {
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obtainDesktopStream = obtainScreenFromExtension;
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console.info("Using Chrome extension for desktop sharing");
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} else if (method == "webrtc") {
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obtainDesktopStream = obtainWebRTCScreen;
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console.info("Using Chrome WebRTC for desktop sharing");
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}
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// Reset enabled cache
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_desktopSharingEnabled = null;
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showDesktopSharingButton();
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}
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/**
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* Initializes <link rel=chrome-webstore-item /> with extension id set in config.js to support inline installs.
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* Host site must be selected as main website of published extension.
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*/
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function initInlineInstalls()
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{
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$("link[rel=chrome-webstore-item]").attr("href", getWebStoreInstallUrl());
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}
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function getSwitchStreamFailed(error) {
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console.error("Failed to obtain the stream to switch to", error);
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switchInProgress = false;
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}
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function streamSwitchDone() {
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//window.setTimeout(
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// function () {
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switchInProgress = false;
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Toolbar.changeDesktopSharingButtonState(isUsingScreenStream);
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// }, 100
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//);
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}
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function newStreamCreated(stream) {
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var oldStream = connection.jingle.localVideo;
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connection.jingle.localVideo = stream;
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VideoLayout.changeLocalVideo(stream, !isUsingScreenStream);
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var conferenceHandler = getConferenceHandler();
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if (conferenceHandler) {
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// FIXME: will block switchInProgress on true value in case of exception
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conferenceHandler.switchStreams(stream, oldStream, streamSwitchDone);
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} else {
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// We are done immediately
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console.error("No conference handler");
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messageHandler.showError('Error',
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'Unable to switch video stream.');
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streamSwitchDone();
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}
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}
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/*
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* Toggles screen sharing.
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*/
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function toggleScreenSharing() {
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if (switchInProgress || !obtainDesktopStream) {
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console.warn("Switch in progress or no method defined");
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return;
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}
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switchInProgress = true;
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// Only the focus is able to set a shared key.
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if (!isUsingScreenStream)
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{
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obtainDesktopStream(
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function (stream) {
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// We now use screen stream
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isUsingScreenStream = true;
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// Hook 'ended' event to restore camera when screen stream stops
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stream.addEventListener('ended',
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function (e) {
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if (!switchInProgress && isUsingScreenStream) {
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toggleScreenSharing();
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}
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}
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);
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newStreamCreated(stream);
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},
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getSwitchStreamFailed);
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} else {
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// Disable screen stream
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getUserMediaWithConstraints(
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['video'],
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function (stream) {
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// We are now using camera stream
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isUsingScreenStream = false;
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newStreamCreated(stream);
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},
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getSwitchStreamFailed, config.resolution || '360'
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);
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}
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}
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