138 lines
3.9 KiB
JavaScript
138 lines
3.9 KiB
JavaScript
/* global APP, config */
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var EventEmitter = require("events");
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var DesktopSharingEventTypes
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= require("../../service/desktopsharing/DesktopSharingEventTypes");
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var RTCBrowserType = require("../RTC/RTCBrowserType");
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var RTCEvents = require("../../service/RTC/RTCEvents");
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var ScreenObtainer = require("./ScreenObtainer");
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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
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* 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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* Used to obtain the screen sharing stream from the browser.
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*/
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var screenObtainer = new ScreenObtainer();
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var eventEmitter = new EventEmitter();
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function streamSwitchDone() {
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switchInProgress = false;
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eventEmitter.emit(
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DesktopSharingEventTypes.SWITCHING_DONE,
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isUsingScreenStream);
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}
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function newStreamCreated(stream) {
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eventEmitter.emit(DesktopSharingEventTypes.NEW_STREAM_CREATED,
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stream, isUsingScreenStream, streamSwitchDone);
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}
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function getVideoStreamFailed(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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isUsingScreenStream = false;
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newStreamCreated(null);
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}
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function getDesktopStreamFailed(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 onEndedHandler(stream) {
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if (!switchInProgress && isUsingScreenStream) {
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APP.desktopsharing.toggleScreenSharing();
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}
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APP.RTC.removeMediaStreamInactiveHandler(stream, onEndedHandler);
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}
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module.exports = {
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isUsingScreenStream: function () {
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return isUsingScreenStream;
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},
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/**
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* @returns {boolean} <tt>true</tt> if desktop sharing feature is available
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* and enabled.
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*/
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isDesktopSharingEnabled: function () {
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return screenObtainer.isSupported();
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},
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init: function () {
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// Called when RTC finishes initialization
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APP.RTC.addListener(RTCEvents.RTC_READY,
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function() {
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screenObtainer.init(eventEmitter);
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eventEmitter.emit(DesktopSharingEventTypes.INIT);
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});
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},
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addListener: function (type, listener) {
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eventEmitter.on(type, listener);
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},
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removeListener: function (type, listener) {
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eventEmitter.removeListener(type, listener);
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},
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/*
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* Toggles screen sharing.
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*/
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toggleScreenSharing: function () {
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if (switchInProgress) {
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console.warn("Switch in progress.");
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return;
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} else if (!screenObtainer.isSupported()) {
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console.warn("Cannot toggle screen sharing: not supported.");
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return;
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}
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switchInProgress = true;
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if (!isUsingScreenStream) {
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// Switch to desktop stream
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screenObtainer.obtainStream(
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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
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// when screen stream stops
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APP.RTC.addMediaStreamInactiveHandler(
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stream, onEndedHandler);
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newStreamCreated(stream);
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},
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getDesktopStreamFailed);
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} else {
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// Disable screen stream
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APP.RTC.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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getVideoStreamFailed,
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config.resolution || '360'
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);
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}
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},
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/*
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* Exports the event emitter to allow use by ScreenObtainer. Not for outside
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* use.
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*/
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eventEmitter: eventEmitter
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};
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