From edb317740843720c9bb979e030c12dc346b3c6a5 Mon Sep 17 00:00:00 2001
From: Jonas Smedegaard <dr@jones.dk>
Date: Sun, 26 Mar 2017 10:52:18 +0200
Subject: Initial live-video support.

---
 js/app/live-video.js     |   44 +
 js/lib/janus.nojquery.js | 2297 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 2341 insertions(+)
 create mode 100644 js/app/live-video.js
 create mode 100644 js/lib/janus.nojquery.js

diff --git a/js/app/live-video.js b/js/app/live-video.js
new file mode 100644
index 0000000..f39e801
--- /dev/null
+++ b/js/app/live-video.js
@@ -0,0 +1,44 @@
+var websocket_server = null;
+if(window.location.protocol === 'http:')
+	websocket_server = "ws://" + window.location.hostname + "/janus-ws";
+else
+	websocket_server = "wss://" + window.location.hostname + "/janus-ws";
+
+var janus = null;
+var streaming = null;
+
+Janus.init({callback: function() {
+	janus = new Janus(
+		{
+			server: [websocket_server, "/janus"],
+			iceServers: [{url: "turn:turn.homebase.dk", username: "myturn", credential: "notsecure"}],
+			ipv6: false,
+			success: function() {
+				janus.attach(
+					{
+						plugin: "janus.plugin.streaming",
+						opaqueId: "streaming-"+Janus.randomString(12),
+						success: function(pluginHandle) {
+							streaming = pluginHandle;
+							streaming.send({"message": { "request": "watch", id: 1}});
+						},
+						onmessage: function(msg, jsep) {
+							if(jsep !== undefined && jsep !== null) {
+								streaming.createAnswer(
+									{
+										jsep: jsep,
+										media: { audioSend: false, videoSend: false },	
+										success: function(jsep) {
+											var body = { "request": "start" };
+											streaming.send({"message": body, "jsep": jsep});
+										},
+									});
+							}
+						},
+						onremotestream: function(stream) {
+							Janus.attachMediaStream(document.getElementById('live-video'), stream);
+						},
+					});
+			},
+		});
+}});
diff --git a/js/lib/janus.nojquery.js b/js/lib/janus.nojquery.js
new file mode 100644
index 0000000..0dfce72
--- /dev/null
+++ b/js/lib/janus.nojquery.js
@@ -0,0 +1,2297 @@
+/*
+	The MIT License (MIT)
+
+	Copyright (c) 2016 Meetecho
+
+	Permission is hereby granted, free of charge, to any person obtaining
+	a copy of this software and associated documentation files (the "Software"),
+	to deal in the Software without restriction, including without limitation
+	the rights to use, copy, modify, merge, publish, distribute, sublicense,
+	and/or sell copies of the Software, and to permit persons to whom the
+	Software is furnished to do so, subject to the following conditions:
+
+	The above copyright notice and this permission notice shall be included
+	in all copies or substantial portions of the Software.
+
+	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+	OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+	THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+	OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+	ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+	OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+// List of sessions
+Janus.sessions = {};
+
+// Screensharing Chrome Extension ID
+Janus.extensionId = "hapfgfdkleiggjjpfpenajgdnfckjpaj";
+Janus.isExtensionEnabled = function() {
+	if(window.navigator.userAgent.match('Chrome')) {
+		var chromever = parseInt(window.navigator.userAgent.match(/Chrome\/(.*) /)[1], 10);
+		var maxver = 33;
+		if(window.navigator.userAgent.match('Linux'))
+			maxver = 35;	// "known" crash in chrome 34 and 35 on linux
+		if(chromever >= 26 && chromever <= maxver) {
+			// Older versions of Chrome don't support this extension-based approach, so lie
+			return true;
+		}
+		return (document.getElementById('janus-extension-installed') !== null);
+	} else {
+		// Firefox of others, no need for the extension (but this doesn't mean it will work)
+		return true;
+	}
+};
+
+Janus.noop = function() {};
+
+// Initialization
+Janus.init = function(options) {
+	options = options || {};
+	options.callback = (typeof options.callback == "function") ? options.callback : Janus.noop;
+	if(Janus.initDone === true) {
+		// Already initialized
+		options.callback();
+	} else {
+		if(typeof console == "undefined" || typeof console.log == "undefined")
+			console = { log: function() {} };
+		// Console logging (all debugging disabled by default)
+		Janus.trace = Janus.noop;
+		Janus.debug = Janus.noop;
+		Janus.vdebug = Janus.noop;
+		Janus.log = Janus.noop;
+		Janus.warn = Janus.noop;
+		Janus.error = Janus.noop;
+		if(options.debug === true || options.debug === "all") {
+			// Enable all debugging levels
+			Janus.trace = console.trace.bind(console);
+			Janus.debug = console.debug.bind(console);
+			Janus.vdebug = console.debug.bind(console);
+			Janus.log = console.log.bind(console);
+			Janus.warn = console.warn.bind(console);
+			Janus.error = console.error.bind(console);
+		} else if(Array.isArray(options.debug)) {
+			for(var i in options.debug) {
+				var d = options.debug[i];
+				switch(d) {
+					case "trace":
+						Janus.trace = console.trace.bind(console);
+						break;
+					case "debug":
+						Janus.debug = console.debug.bind(console);
+						break;
+					case "vdebug":
+						Janus.vdebug = console.debug.bind(console);
+						break;
+					case "log":
+						Janus.log = console.log.bind(console);
+						break;
+					case "warn":
+						Janus.warn = console.warn.bind(console);
+						break;
+					case "error":
+						Janus.error = console.error.bind(console);
+						break;
+					default:
+						console.error("Unknown debugging option '" + d + "' (supported: 'trace', 'debug', 'vdebug', 'log', warn', 'error')");
+						break;
+				}
+			}
+		}
+		Janus.log("Initializing library");
+		// Helper method to enumerate devices
+		Janus.listDevices = function(callback) {
+			callback = (typeof callback == "function") ? callback : Janus.noop;
+			if(navigator.mediaDevices) {
+				navigator.mediaDevices.getUserMedia({ audio: true, video: true })
+				.then(function(stream) {
+					navigator.mediaDevices.enumerateDevices().then(function(devices) {
+						Janus.debug(devices);
+						callback(devices);
+						// Get rid of the now useless stream
+						try {
+							stream.stop();
+						} catch(e) {}
+						try {
+							var tracks = stream.getTracks();
+							for(var i in tracks) {
+								var mst = tracks[i];
+								if(mst !== null && mst !== undefined)
+									mst.stop();
+							}
+						} catch(e) {}
+					});
+				})
+				.catch(function(err) {
+					Janus.error(err);
+					callback([]);
+				});
+			} else {
+				Janus.warn("navigator.mediaDevices unavailable");
+				callback([]);
+			}
+		}
+		// Helper methods to attach/reattach a stream to a video element (previously part of adapter.js)
+		Janus.attachMediaStream = function(element, stream) {
+			if(adapter.browserDetails.browser === 'chrome') {
+				var chromever = adapter.browserDetails.version;
+				if(chromever >= 43) {
+					element.srcObject = stream;
+				} else if(typeof element.src !== 'undefined') {
+					element.src = URL.createObjectURL(stream);
+				} else {
+					Janus.error("Error attaching stream to element");
+				}
+			} else {
+				element.srcObject = stream;
+			}
+		};
+		Janus.reattachMediaStream = function(to, from) {
+			if(adapter.browserDetails.browser === 'chrome') {
+				var chromever = adapter.browserDetails.version;
+				if(chromever >= 43) {
+					to.srcObject = from.srcObject;
+				} else if(typeof to.src !== 'undefined') {
+					to.src = from.src;
+				}
+			} else {
+				to.srcObject = from.srcObject;
+			}
+		};
+		// Prepare a helper method to send AJAX requests in a syntax similar to jQuery (at least for what we care)
+		Janus.ajax = function(params) {
+			// Check params
+			if(params === null || params === undefined)
+				return;
+			params.success = (typeof params.success == "function") ? params.success : Janus.noop;
+			params.error = (typeof params.error == "function") ? params.error : Janus.noop;
+			// Make sure there's an URL
+			if(params.url === null || params.url === undefined) {
+				Janus.error('Missing url', params.url);
+				params.error(null, -1, 'Missing url');
+				return;
+			}
+			// Validate async
+			params.async = (params.async === null || params.async === undefined) ? true : (params.async === true);
+			Janus.log(params);
+			// IE doesn't even know what WebRTC is, so no polyfill needed
+			var XHR = new XMLHttpRequest();
+			XHR.open(params.type, params.url, params.async);
+			if(params.contentType !== null && params.contentType !== undefined)
+				XHR.setRequestHeader('Content-type', params.contentType);
+			if(params.withCredentials !== null && params.withCredentials !== undefined)
+				XHR.withCredentials = params.withCredentials;
+			if(params.async) {
+				XHR.onreadystatechange = function () {
+					if(XHR.readyState != 4)
+						return;
+					if(XHR.status !== 200) {
+						// Got an error?
+						params.error(XHR, XHR.status !== 0 ? XHR.status : 'error', "");
+						return;
+					}
+					// Got payload
+					params.success(JSON.parse(XHR.responseText));
+				};
+			}
+			try {
+				XHR.send(params.data);
+				if(!params.async) {
+					if(XHR.status !== 200) {
+						// Got an error?
+						params.error(XHR, XHR.status !== 0 ? XHR.status : 'error', "");
+						return;
+					}
+					// Got payload
+					params.success(JSON.parse(XHR.responseText));
+				}
+			} catch(e) {
+				// Something broke up
+				params.error(XHR, 'error', '');
+			};
+		};
+		// Detect tab close: make sure we don't loose existing onbeforeunload handlers
+		var oldOBF = window.onbeforeunload;
+		window.onbeforeunload = function() {
+			Janus.log("Closing window");
+			for(var s in Janus.sessions) {
+				if(Janus.sessions[s] !== null && Janus.sessions[s] !== undefined &&
+						Janus.sessions[s].destroyOnUnload) {
+					Janus.log("Destroying session " + s);
+					Janus.sessions[s].destroy({asyncRequest: false});
+				}
+			}
+			if(oldOBF && typeof oldOBF == "function")
+				oldOBF();
+		}
+		function addJsList(srcArray) {
+			if (!srcArray || !Array.isArray(srcArray) || srcArray.length == 0) {
+				options.callback();
+			}
+			var count = 0;
+			addJs(srcArray[count],next);
+
+			function next() {
+				count++;
+				if (count<srcArray.length) {
+					addJs(srcArray[count],next);
+				}
+				else {
+					options.callback();
+				}
+			}
+		}
+		function addJs(src,done) {
+			try {
+				if(adapter) {
+					// Already loaded
+					Janus.debug(src + " already loaded, skipping");
+					done();
+					return;
+				}
+			} catch(e) {};
+			var oHead = document.getElementsByTagName('head').item(0);
+			var oScript = document.createElement("script");
+			oScript.type = "text/javascript";
+			oScript.src = src;
+			oScript.onload = function() {
+				Janus.log("Library " + src + " loaded");
+				done();
+			}
+			oHead.appendChild(oScript);
+		}
+		Janus.initDone = true;
+		addJsList(["adapter.js"]);	// We may need others in the future
+	}
+};
+
+// Helper method to check whether WebRTC is supported by this browser
+Janus.isWebrtcSupported = function() {
+	return window.RTCPeerConnection !== undefined && window.RTCPeerConnection !== null &&
+		navigator.getUserMedia !== undefined && navigator.getUserMedia !== null;
+};
+
+// Helper method to create random identifiers (e.g., transaction)
+Janus.randomString = function(len) {
+	var charSet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+	var randomString = '';
+	for (var i = 0; i < len; i++) {
+		var randomPoz = Math.floor(Math.random() * charSet.length);
+		randomString += charSet.substring(randomPoz,randomPoz+1);
+	}
+	return randomString;
+}
+
+
+// Janus session object
+function Janus(gatewayCallbacks) {
+	if(Janus.initDone === undefined) {
+		gatewayCallbacks.error("Library not initialized");
+		return {};
+	}
+	if(!Janus.isWebrtcSupported()) {
+		gatewayCallbacks.error("WebRTC not supported by this browser");
+		return {};
+	}
+	Janus.log("Library initialized: " + Janus.initDone);
+	gatewayCallbacks = gatewayCallbacks || {};
+	gatewayCallbacks.success = (typeof gatewayCallbacks.success == "function") ? gatewayCallbacks.success : Janus.noop;
+	gatewayCallbacks.error = (typeof gatewayCallbacks.error == "function") ? gatewayCallbacks.error : Janus.noop;
+	gatewayCallbacks.destroyed = (typeof gatewayCallbacks.destroyed == "function") ? gatewayCallbacks.destroyed : Janus.noop;
+	if(gatewayCallbacks.server === null || gatewayCallbacks.server === undefined) {
+		gatewayCallbacks.error("Invalid gateway url");
+		return {};
+	}
+	var websockets = false;
+	var ws = null;
+	var wsHandlers = {};
+	var wsKeepaliveTimeoutId = null;
+
+	var servers = null, serversIndex = 0;
+	var server = gatewayCallbacks.server;
+	if(Array.isArray(server)) {
+		Janus.log("Multiple servers provided (" + server.length + "), will use the first that works");
+		server = null;
+		servers = gatewayCallbacks.server;
+		Janus.debug(servers);
+	} else {
+		if(server.indexOf("ws") === 0) {
+			websockets = true;
+			Janus.log("Using WebSockets to contact Janus: " + server);
+		} else {
+			websockets = false;
+			Janus.log("Using REST API to contact Janus: " + server);
+		}
+	}
+	var iceServers = gatewayCallbacks.iceServers;
+	if(iceServers === undefined || iceServers === null)
+		iceServers = [{urls: "stun:stun.l.google.com:19302"}];
+	var iceTransportPolicy = gatewayCallbacks.iceTransportPolicy;
+	// Whether IPv6 candidates should be gathered
+	var ipv6Support = gatewayCallbacks.ipv6;
+	if(ipv6Support === undefined || ipv6Support === null)
+		ipv6Support = false;
+	// Whether we should enable the withCredentials flag for XHR requests
+	var withCredentials = false;
+	if(gatewayCallbacks.withCredentials !== undefined && gatewayCallbacks.withCredentials !== null)
+		withCredentials = gatewayCallbacks.withCredentials === true;
+	// Optional max events
+	var maxev = null;
+	if(gatewayCallbacks.max_poll_events !== undefined && gatewayCallbacks.max_poll_events !== null)
+		maxev = gatewayCallbacks.max_poll_events;
+	if(maxev < 1)
+		maxev = 1;
+	// Token to use (only if the token based authentication mechanism is enabled)
+	var token = null;
+	if(gatewayCallbacks.token !== undefined && gatewayCallbacks.token !== null)
+		token = gatewayCallbacks.token;
+	// API secret to use (only if the shared API secret is enabled)
+	var apisecret = null;
+	if(gatewayCallbacks.apisecret !== undefined && gatewayCallbacks.apisecret !== null)
+		apisecret = gatewayCallbacks.apisecret;
+	// Whether we should destroy this session when onbeforeunload is called
+	this.destroyOnUnload = true;
+	if(gatewayCallbacks.destroyOnUnload !== undefined && gatewayCallbacks.destroyOnUnload !== null)
+		this.destroyOnUnload = (gatewayCallbacks.destroyOnUnload === true);
+
+	var connected = false;
+	var sessionId = null;
+	var pluginHandles = {};
+	var that = this;
+	var retries = 0;
+	var transactions = {};
+	createSession(gatewayCallbacks);
+
+	// Public methods
+	this.getServer = function() { return server; };
+	this.isConnected = function() { return connected; };
+	this.getSessionId = function() { return sessionId; };
+	this.destroy = function(callbacks) { destroySession(callbacks, true); };
+	this.attach = function(callbacks) { createHandle(callbacks); };
+
+	function eventHandler() {
+		if(sessionId == null)
+			return;
+		Janus.debug('Long poll...');
+		if(!connected) {
+			Janus.warn("Is the gateway down? (connected=false)");
+			return;
+		}
+		var longpoll = server + "/" + sessionId + "?rid=" + new Date().getTime();
+		if(maxev !== undefined && maxev !== null)
+			longpoll = longpoll + "&maxev=" + maxev;
+		if(token !== null && token !== undefined)
+			longpoll = longpoll + "&token=" + token;
+		if(apisecret !== null && apisecret !== undefined)
+			longpoll = longpoll + "&apisecret=" + apisecret;
+		Janus.ajax({
+			type: 'GET',
+			url: longpoll,
+			withCredentials: withCredentials,
+			cache: false,
+			timeout: 60000,	// FIXME
+			success: handleEvent,
+			error: function(XMLHttpRequest, textStatus, errorThrown) {
+				Janus.error(textStatus + ": " + errorThrown);
+				retries++;
+				if(retries > 3) {
+					// Did we just lose the gateway? :-(
+					connected = false;
+					gatewayCallbacks.error("Lost connection to the gateway (is it down?)");
+					return;
+				}
+				eventHandler();
+			},
+			dataType: "json"
+		});
+	}
+
+	// Private event handler: this will trigger plugin callbacks, if set
+	function handleEvent(json) {
+		retries = 0;
+		if(!websockets && sessionId !== undefined && sessionId !== null)
+			setTimeout(eventHandler, 200);
+		if(!websockets && Array.isArray(json)) {
+			// We got an array: it means we passed a maxev > 1, iterate on all objects
+			for(var i=0; i<json.length; i++) {
+				handleEvent(json[i]);
+			}
+			return;
+		}
+		if(json["janus"] === "keepalive") {
+			// Nothing happened
+			Janus.vdebug("Got a keepalive on session " + sessionId);
+			return;
+		} else if(json["janus"] === "ack") {
+			// Just an ack, we can probably ignore
+			Janus.debug("Got an ack on session " + sessionId);
+			Janus.debug(json);
+			var transaction = json["transaction"];
+			if(transaction !== null && transaction !== undefined) {
+				var reportSuccess = transactions[transaction];
+				if(reportSuccess !== null && reportSuccess !== undefined) {
+					reportSuccess(json);
+				}
+				delete transactions[transaction];
+			}
+			return;
+		} else if(json["janus"] === "success") {
+			// Success!
+			Janus.debug("Got a success on session " + sessionId);
+			Janus.debug(json);
+			var transaction = json["transaction"];
+			if(transaction !== null && transaction !== undefined) {
+				var reportSuccess = transactions[transaction];
+				if(reportSuccess !== null && reportSuccess !== undefined) {
+					reportSuccess(json);
+				}
+				delete transactions[transaction];
+			}
+			return;
+		} else if(json["janus"] === "webrtcup") {
+			// The PeerConnection with the gateway is up! Notify this
+			Janus.debug("Got a webrtcup event on session " + sessionId);
+			Janus.debug(json);
+			var sender = json["sender"];
+			if(sender === undefined || sender === null) {
+				Janus.warn("Missing sender...");
+				return;
+			}
+			var pluginHandle = pluginHandles[sender];
+			if(pluginHandle === undefined || pluginHandle === null) {
+				Janus.warn("This handle is not attached to this session");
+				return;
+			}
+			pluginHandle.webrtcState(true);
+			return;
+		} else if(json["janus"] === "hangup") {
+			// A plugin asked the core to hangup a PeerConnection on one of our handles
+			Janus.debug("Got a hangup event on session " + sessionId);
+			Janus.debug(json);
+			var sender = json["sender"];
+			if(sender === undefined || sender === null) {
+				Janus.warn("Missing sender...");
+				return;
+			}
+			var pluginHandle = pluginHandles[sender];
+			if(pluginHandle === undefined || pluginHandle === null) {
+				Janus.warn("This handle is not attached to this session");
+				return;
+			}
+			pluginHandle.webrtcState(false);
+			pluginHandle.hangup();
+		} else if(json["janus"] === "detached") {
+			// A plugin asked the core to detach one of our handles
+			Janus.debug("Got a detached event on session " + sessionId);
+			Janus.debug(json);
+			var sender = json["sender"];
+			if(sender === undefined || sender === null) {
+				Janus.warn("Missing sender...");
+				return;
+			}
+			var pluginHandle = pluginHandles[sender];
+			if(pluginHandle === undefined || pluginHandle === null) {
+				// Don't warn here because destroyHandle causes this situation.
+				return;
+			}
+			pluginHandle.ondetached();
+			pluginHandle.detach();
+		} else if(json["janus"] === "media") {
+			// Media started/stopped flowing
+			Janus.debug("Got a media event on session " + sessionId);
+			Janus.debug(json);
+			var sender = json["sender"];
+			if(sender === undefined || sender === null) {
+				Janus.warn("Missing sender...");
+				return;
+			}
+			var pluginHandle = pluginHandles[sender];
+			if(pluginHandle === undefined || pluginHandle === null) {
+				Janus.warn("This handle is not attached to this session");
+				return;
+			}
+			pluginHandle.mediaState(json["type"], json["receiving"]);
+		} else if(json["janus"] === "slowlink") {
+			Janus.debug("Got a slowlink event on session " + sessionId);
+			Janus.debug(json);
+			// Trouble uplink or downlink
+			var sender = json["sender"];
+			if(sender === undefined || sender === null) {
+				Janus.warn("Missing sender...");
+				return;
+			}
+			var pluginHandle = pluginHandles[sender];
+			if(pluginHandle === undefined || pluginHandle === null) {
+				Janus.warn("This handle is not attached to this session");
+				return;
+			}
+			pluginHandle.slowLink(json["uplink"], json["nacks"]);
+		} else if(json["janus"] === "error") {
+			// Oops, something wrong happened
+			Janus.error("Ooops: " + json["error"].code + " " + json["error"].reason);	// FIXME
+			Janus.debug(json);
+			var transaction = json["transaction"];
+			if(transaction !== null && transaction !== undefined) {
+				var reportSuccess = transactions[transaction];
+				if(reportSuccess !== null && reportSuccess !== undefined) {
+					reportSuccess(json);
+				}
+				delete transactions[transaction];
+			}
+			return;
+		} else if(json["janus"] === "event") {
+			Janus.debug("Got a plugin event on session " + sessionId);
+			Janus.debug(json);
+			var sender = json["sender"];
+			if(sender === undefined || sender === null) {
+				Janus.warn("Missing sender...");
+				return;
+			}
+			var plugindata = json["plugindata"];
+			if(plugindata === undefined || plugindata === null) {
+				Janus.warn("Missing plugindata...");
+				return;
+			}
+			Janus.debug("  -- Event is coming from " + sender + " (" + plugindata["plugin"] + ")");
+			var data = plugindata["data"];
+			Janus.debug(data);
+			var pluginHandle = pluginHandles[sender];
+			if(pluginHandle === undefined || pluginHandle === null) {
+				Janus.warn("This handle is not attached to this session");
+				return;
+			}
+			var jsep = json["jsep"];
+			if(jsep !== undefined && jsep !== null) {
+				Janus.debug("Handling SDP as well...");
+				Janus.debug(jsep);
+			}
+			var callback = pluginHandle.onmessage;
+			if(callback !== null && callback !== undefined) {
+				Janus.debug("Notifying application...");
+				// Send to callback specified when attaching plugin handle
+				callback(data, jsep);
+			} else {
+				// Send to generic callback (?)
+				Janus.debug("No provided notification callback");
+			}
+		} else {
+			Janus.warn("Unkown message/event  '" + json["janus"] + "' on session " + sessionId);
+			Janus.debug(json);
+		}
+	}
+
+	// Private helper to send keep-alive messages on WebSockets
+	function keepAlive() {
+		if(server === null || !websockets || !connected)
+			return;
+		wsKeepaliveTimeoutId = setTimeout(keepAlive, 30000);
+		var request = { "janus": "keepalive", "session_id": sessionId, "transaction": Janus.randomString(12) };
+		if(token !== null && token !== undefined)
+			request["token"] = token;
+		if(apisecret !== null && apisecret !== undefined)
+			request["apisecret"] = apisecret;
+		ws.send(JSON.stringify(request));
+	}
+
+	// Private method to create a session
+	function createSession(callbacks) {
+		var transaction = Janus.randomString(12);
+		var request = { "janus": "create", "transaction": transaction };
+		if(token !== null && token !== undefined)
+			request["token"] = token;
+		if(apisecret !== null && apisecret !== undefined)
+			request["apisecret"] = apisecret;
+		if(server === null && Array.isArray(servers)) {
+			// We still need to find a working server from the list we were given
+			server = servers[serversIndex];
+			if(server.indexOf("ws") === 0) {
+				websockets = true;
+				Janus.log("Server #" + (serversIndex+1) + ": trying WebSockets to contact Janus (" + server + ")");
+			} else {
+				websockets = false;
+				Janus.log("Server #" + (serversIndex+1) + ": trying REST API to contact Janus (" + server + ")");
+			}
+		}
+		if(websockets) {
+			ws = new WebSocket(server, 'janus-protocol');
+			wsHandlers = {
+				'error': function() {
+					Janus.error("Error connecting to the Janus WebSockets server... " + server);
+					if (Array.isArray(servers)) {
+						serversIndex++;
+						if (serversIndex == servers.length) {
+							// We tried all the servers the user gave us and they all failed
+							callbacks.error("Error connecting to any of the provided Janus servers: Is the gateway down?");
+							return;
+						}
+						// Let's try the next server
+						server = null;
+						setTimeout(function() {
+							createSession(callbacks);
+						}, 200);
+						return;
+					}
+					callbacks.error("Error connecting to the Janus WebSockets server: Is the gateway down?");
+				},
+
+				'open': function() {
+					// We need to be notified about the success
+					transactions[transaction] = function(json) {
+						Janus.debug(json);
+						if (json["janus"] !== "success") {
+							Janus.error("Ooops: " + json["error"].code + " " + json["error"].reason);	// FIXME
+							callbacks.error(json["error"].reason);
+							return;
+						}
+						wsKeepaliveTimeoutId = setTimeout(keepAlive, 30000);
+						connected = true;
+						sessionId = json.data["id"];
+						Janus.log("Created session: " + sessionId);
+						Janus.sessions[sessionId] = that;
+						callbacks.success();
+					};
+					ws.send(JSON.stringify(request));
+				},
+
+				'message': function(event) {
+					handleEvent(JSON.parse(event.data));
+				},
+
+				'close': function() {
+					if (server === null || !connected) {
+						return;
+					}
+					connected = false;
+					// FIXME What if this is called when the page is closed?
+					gatewayCallbacks.error("Lost connection to the gateway (is it down?)");
+				}
+			};
+
+			for(var eventName in wsHandlers) {
+				ws.addEventListener(eventName, wsHandlers[eventName]);
+			}
+
+			return;
+		}
+		Janus.ajax({
+			type: 'POST',
+			url: server,
+			withCredentials: withCredentials,
+			cache: false,
+			contentType: "application/json",
+			data: JSON.stringify(request),
+			success: function(json) {
+				Janus.debug(json);
+				if(json["janus"] !== "success") {
+					Janus.error("Ooops: " + json["error"].code + " " + json["error"].reason);	// FIXME
+					callbacks.error(json["error"].reason);
+					return;
+				}
+				connected = true;
+				sessionId = json.data["id"];
+				Janus.log("Created session: " + sessionId);
+				Janus.sessions[sessionId] = that;
+				eventHandler();
+				callbacks.success();
+			},
+			error: function(XMLHttpRequest, textStatus, errorThrown) {
+				Janus.error(textStatus + ": " + errorThrown);	// FIXME
+				if(Array.isArray(servers)) {
+					serversIndex++;
+					if(serversIndex == servers.length) {
+						// We tried all the servers the user gave us and they all failed
+						callbacks.error("Error connecting to any of the provided Janus servers: Is the gateway down?");
+						return;
+					}
+					// Let's try the next server
+					server = null;
+					setTimeout(function() { createSession(callbacks); }, 200);
+					return;
+				}
+				if(errorThrown === "")
+					callbacks.error(textStatus + ": Is the gateway down?");
+				else
+					callbacks.error(textStatus + ": " + errorThrown);
+			},
+			dataType: "json"
+		});
+	}
+
+	// Private method to destroy a session
+	function destroySession(callbacks) {
+		callbacks = callbacks || {};
+		// FIXME This method triggers a success even when we fail
+		callbacks.success = (typeof callbacks.success == "function") ? callbacks.success : Janus.noop;
+		var asyncRequest = true;
+		if(callbacks.asyncRequest !== undefined && callbacks.asyncRequest !== null)
+			asyncRequest = (callbacks.asyncRequest === true);
+		Janus.log("Destroying session " + sessionId + " (async=" + asyncRequest + ")");
+		if(!connected) {
+			Janus.warn("Is the gateway down? (connected=false)");
+			callbacks.success();
+			return;
+		}
+		if(sessionId === undefined || sessionId === null) {
+			Janus.warn("No session to destroy");
+			callbacks.success();
+			gatewayCallbacks.destroyed();
+			return;
+		}
+		delete Janus.sessions[sessionId];
+		// Destroy all handles first
+		for(var ph in pluginHandles) {
+			var phv = pluginHandles[ph];
+			Janus.log("Destroying handle " + phv.id + " (" + phv.plugin + ")");
+			destroyHandle(phv.id, {asyncRequest: asyncRequest});
+		}
+		// Ok, go on
+		var request = { "janus": "destroy", "transaction": Janus.randomString(12) };
+		if(token !== null && token !== undefined)
+			request["token"] = token;
+		if(apisecret !== null && apisecret !== undefined)
+			request["apisecret"] = apisecret;
+		if(websockets) {
+			request["session_id"] = sessionId;
+
+			var unbindWebSocket = function() {
+				for(var eventName in wsHandlers) {
+					ws.removeEventListener(eventName, wsHandlers[eventName]);
+				}
+				ws.removeEventListener('message', onUnbindMessage);
+				ws.removeEventListener('error', onUnbindError);
+				if(wsKeepaliveTimeoutId) {
+					clearTimeout(wsKeepaliveTimeoutId);
+				}
+			};
+
+			var onUnbindMessage = function(event){
+				var data = JSON.parse(event.data);
+				if(data.session_id == request.session_id && data.transaction == request.transaction) {
+					unbindWebSocket();
+					callbacks.success();
+					gatewayCallbacks.destroyed();
+				}
+			};
+			var onUnbindError = function(event) {
+				unbindWebSocket();
+				callbacks.error("Failed to destroy the gateway: Is the gateway down?");
+				gatewayCallbacks.destroyed();
+			};
+
+			ws.addEventListener('message', onUnbindMessage);
+			ws.addEventListener('error', onUnbindError);
+
+			ws.send(JSON.stringify(request));
+			return;
+		}
+		Janus.ajax({
+			type: 'POST',
+			url: server + "/" + sessionId,
+			async: asyncRequest,	// Sometimes we need false here, or destroying in onbeforeunload won't work
+			withCredentials: withCredentials,
+			cache: false,
+			contentType: "application/json",
+			data: JSON.stringify(request),
+			success: function(json) {
+				Janus.log("Destroyed session:");
+				Janus.debug(json);
+				sessionId = null;
+				connected = false;
+				if(json["janus"] !== "success") {
+					Janus.error("Ooops: " + json["error"].code + " " + json["error"].reason);	// FIXME
+				}
+				callbacks.success();
+				gatewayCallbacks.destroyed();
+			},
+			error: function(XMLHttpRequest, textStatus, errorThrown) {
+				Janus.error(textStatus + ": " + errorThrown);	// FIXME
+				// Reset everything anyway
+				sessionId = null;
+				connected = false;
+				callbacks.success();
+				gatewayCallbacks.destroyed();
+			},
+			dataType: "json"
+		});
+	}
+
+	// Private method to create a plugin handle
+	function createHandle(callbacks) {
+		callbacks = callbacks || {};
+		callbacks.success = (typeof callbacks.success == "function") ? callbacks.success : Janus.noop;
+		callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : Janus.noop;
+		callbacks.consentDialog = (typeof callbacks.consentDialog == "function") ? callbacks.consentDialog : Janus.noop;
+		callbacks.mediaState = (typeof callbacks.mediaState == "function") ? callbacks.mediaState : Janus.noop;
+		callbacks.webrtcState = (typeof callbacks.webrtcState == "function") ? callbacks.webrtcState : Janus.noop;
+		callbacks.slowLink = (typeof callbacks.slowLink == "function") ? callbacks.slowLink : Janus.noop;
+		callbacks.onmessage = (typeof callbacks.onmessage == "function") ? callbacks.onmessage : Janus.noop;
+		callbacks.onlocalstream = (typeof callbacks.onlocalstream == "function") ? callbacks.onlocalstream : Janus.noop;
+		callbacks.onremotestream = (typeof callbacks.onremotestream == "function") ? callbacks.onremotestream : Janus.noop;
+		callbacks.ondata = (typeof callbacks.ondata == "function") ? callbacks.ondata : Janus.noop;
+		callbacks.ondataopen = (typeof callbacks.ondataopen == "function") ? callbacks.ondataopen : Janus.noop;
+		callbacks.oncleanup = (typeof callbacks.oncleanup == "function") ? callbacks.oncleanup : Janus.noop;
+		callbacks.ondetached = (typeof callbacks.ondetached == "function") ? callbacks.ondetached : Janus.noop;
+		if(!connected) {
+			Janus.warn("Is the gateway down? (connected=false)");
+			callbacks.error("Is the gateway down? (connected=false)");
+			return;
+		}
+		var plugin = callbacks.plugin;
+		if(plugin === undefined || plugin === null) {
+			Janus.error("Invalid plugin");
+			callbacks.error("Invalid plugin");
+			return;
+		}
+		var opaqueId = callbacks.opaqueId;
+		var transaction = Janus.randomString(12);
+		var request = { "janus": "attach", "plugin": plugin, "opaque_id": opaqueId, "transaction": transaction };
+		if(token !== null && token !== undefined)
+			request["token"] = token;
+		if(apisecret !== null && apisecret !== undefined)
+			request["apisecret"] = apisecret;
+		if(websockets) {
+			transactions[transaction] = function(json) {
+				Janus.debug(json);
+				if(json["janus"] !== "success") {
+					Janus.error("Ooops: " + json["error"].code + " " + json["error"].reason);	// FIXME
+					callbacks.error("Ooops: " + json["error"].code + " " + json["error"].reason);
+					return;
+				}
+				var handleId = json.data["id"];
+				Janus.log("Created handle: " + handleId);
+				var pluginHandle =
+					{
+						session : that,
+						plugin : plugin,
+						id : handleId,
+						webrtcStuff : {
+							started : false,
+							myStream : null,
+							streamExternal : false,
+							remoteStream : null,
+							mySdp : null,
+							pc : null,
+							dataChannel : null,
+							dtmfSender : null,
+							trickle : true,
+							iceDone : false,
+							sdpSent : false,
+							volume : {
+								value : null,
+								timer : null
+							},
+							bitrate : {
+								value : null,
+								bsnow : null,
+								bsbefore : null,
+								tsnow : null,
+								tsbefore : null,
+								timer : null
+							}
+						},
+						getId : function() { return handleId; },
+						getPlugin : function() { return plugin; },
+						getVolume : function() { return getVolume(handleId); },
+						isAudioMuted : function() { return isMuted(handleId, false); },
+						muteAudio : function() { return mute(handleId, false, true); },
+						unmuteAudio : function() { return mute(handleId, false, false); },
+						isVideoMuted : function() { return isMuted(handleId, true); },
+						muteVideo : function() { return mute(handleId, true, true); },
+						unmuteVideo : function() { return mute(handleId, true, false); },
+						getBitrate : function() { return getBitrate(handleId); },
+						send : function(callbacks) { sendMessage(handleId, callbacks); },
+						data : function(callbacks) { sendData(handleId, callbacks); },
+						dtmf : function(callbacks) { sendDtmf(handleId, callbacks); },
+						consentDialog : callbacks.consentDialog,
+						mediaState : callbacks.mediaState,
+						webrtcState : callbacks.webrtcState,
+						slowLink : callbacks.slowLink,
+						onmessage : callbacks.onmessage,
+						createOffer : function(callbacks) { prepareWebrtc(handleId, callbacks); },
+						createAnswer : function(callbacks) { prepareWebrtc(handleId, callbacks); },
+						handleRemoteJsep : function(callbacks) { prepareWebrtcPeer(handleId, callbacks); },
+						onlocalstream : callbacks.onlocalstream,
+						onremotestream : callbacks.onremotestream,
+						ondata : callbacks.ondata,
+						ondataopen : callbacks.ondataopen,
+						oncleanup : callbacks.oncleanup,
+						ondetached : callbacks.ondetached,
+						hangup : function(sendRequest) { cleanupWebrtc(handleId, sendRequest === true); },
+						detach : function(callbacks) { destroyHandle(handleId, callbacks); }
+					}
+				pluginHandles[handleId] = pluginHandle;
+				callbacks.success(pluginHandle);
+			};
+			request["session_id"] = sessionId;
+			ws.send(JSON.stringify(request));
+			return;
+		}
+		Janus.ajax({
+			type: 'POST',
+			url: server + "/" + sessionId,
+			withCredentials: withCredentials,
+			cache: false,
+			contentType: "application/json",
+			data: JSON.stringify(request),
+			success: function(json) {
+				Janus.debug(json);
+				if(json["janus"] !== "success") {
+					Janus.error("Ooops: " + json["error"].code + " " + json["error"].reason);	// FIXME
+					callbacks.error("Ooops: " + json["error"].code + " " + json["error"].reason);
+					return;
+				}
+				var handleId = json.data["id"];
+				Janus.log("Created handle: " + handleId);
+				var pluginHandle =
+					{
+						session : that,
+						plugin : plugin,
+						id : handleId,
+						webrtcStuff : {
+							started : false,
+							myStream : null,
+							streamExternal : false,
+							remoteStream : null,
+							mySdp : null,
+							pc : null,
+							dataChannel : null,
+							dtmfSender : null,
+							trickle : true,
+							iceDone : false,
+							sdpSent : false,
+							volume : {
+								value : null,
+								timer : null
+							},
+							bitrate : {
+								value : null,
+								bsnow : null,
+								bsbefore : null,
+								tsnow : null,
+								tsbefore : null,
+								timer : null
+							}
+						},
+						getId : function() { return handleId; },
+						getPlugin : function() { return plugin; },
+						getVolume : function() { return getVolume(handleId); },
+						isAudioMuted : function() { return isMuted(handleId, false); },
+						muteAudio : function() { return mute(handleId, false, true); },
+						unmuteAudio : function() { return mute(handleId, false, false); },
+						isVideoMuted : function() { return isMuted(handleId, true); },
+						muteVideo : function() { return mute(handleId, true, true); },
+						unmuteVideo : function() { return mute(handleId, true, false); },
+						getBitrate : function() { return getBitrate(handleId); },
+						send : function(callbacks) { sendMessage(handleId, callbacks); },
+						data : function(callbacks) { sendData(handleId, callbacks); },
+						dtmf : function(callbacks) { sendDtmf(handleId, callbacks); },
+						consentDialog : callbacks.consentDialog,
+						mediaState : callbacks.mediaState,
+						webrtcState : callbacks.webrtcState,
+						slowLink : callbacks.slowLink,
+						onmessage : callbacks.onmessage,
+						createOffer : function(callbacks) { prepareWebrtc(handleId, callbacks); },
+						createAnswer : function(callbacks) { prepareWebrtc(handleId, callbacks); },
+						handleRemoteJsep : function(callbacks) { prepareWebrtcPeer(handleId, callbacks); },
+						onlocalstream : callbacks.onlocalstream,
+						onremotestream : callbacks.onremotestream,
+						ondata : callbacks.ondata,
+						ondataopen : callbacks.ondataopen,
+						oncleanup : callbacks.oncleanup,
+						ondetached : callbacks.ondetached,
+						hangup : function(sendRequest) { cleanupWebrtc(handleId, sendRequest === true); },
+						detach : function(callbacks) { destroyHandle(handleId, callbacks); }
+					}
+				pluginHandles[handleId] = pluginHandle;
+				callbacks.success(pluginHandle);
+			},
+			error: function(XMLHttpRequest, textStatus, errorThrown) {
+				Janus.error(textStatus + ": " + errorThrown);	// FIXME
+			},
+			dataType: "json"
+		});
+	}
+
+	// Private method to send a message
+	function sendMessage(handleId, callbacks) {
+		callbacks = callbacks || {};
+		callbacks.success = (typeof callbacks.success == "function") ? callbacks.success : Janus.noop;
+		callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : Janus.noop;
+		if(!connected) {
+			Janus.warn("Is the gateway down? (connected=false)");
+			callbacks.error("Is the gateway down? (connected=false)");
+			return;
+		}
+		var message = callbacks.message;
+		var jsep = callbacks.jsep;
+		var transaction = Janus.randomString(12);
+		var request = { "janus": "message", "body": message, "transaction": transaction };
+		if(token !== null && token !== undefined)
+			request["token"] = token;
+		if(apisecret !== null && apisecret !== undefined)
+			request["apisecret"] = apisecret;
+		if(jsep !== null && jsep !== undefined)
+			request.jsep = jsep;
+		Janus.debug("Sending message to plugin (handle=" + handleId + "):");
+		Janus.debug(request);
+		if(websockets) {
+			request["session_id"] = sessionId;
+			request["handle_id"] = handleId;
+			transactions[transaction] = function(json) {
+				Janus.debug("Message sent!");
+				Janus.debug(json);
+				if(json["janus"] === "success") {
+					// We got a success, must have been a synchronous transaction
+					var plugindata = json["plugindata"];
+					if(plugindata === undefined || plugindata === null) {
+						Janus.warn("Request succeeded, but missing plugindata...");
+						callbacks.success();
+						return;
+					}
+					Janus.log("Synchronous transaction successful (" + plugindata["plugin"] + ")");
+					var data = plugindata["data"];
+					Janus.debug(data);
+					callbacks.success(data);
+					return;
+				} else if(json["janus"] !== "ack") {
+					// Not a success and not an ack, must be an error
+					if(json["error"] !== undefined && json["error"] !== null) {
+						Janus.error("Ooops: " + json["error"].code + " " + json["error"].reason);	// FIXME
+						callbacks.error(json["error"].code + " " + json["error"].reason);
+					} else {
+						Janus.error("Unknown error");	// FIXME
+						callbacks.error("Unknown error");
+					}
+					return;
+				}
+				// If we got here, the plugin decided to handle the request asynchronously
+				callbacks.success();
+			};
+			ws.send(JSON.stringify(request));
+			return;
+		}
+		Janus.ajax({
+			type: 'POST',
+			url: server + "/" + sessionId + "/" + handleId,
+			withCredentials: withCredentials,
+			cache: false,
+			contentType: "application/json",
+			data: JSON.stringify(request),
+			success: function(json) {
+				Janus.debug("Message sent!");
+				Janus.debug(json);
+				if(json["janus"] === "success") {
+					// We got a success, must have been a synchronous transaction
+					var plugindata = json["plugindata"];
+					if(plugindata === undefined || plugindata === null) {
+						Janus.warn("Request succeeded, but missing plugindata...");
+						callbacks.success();
+						return;
+					}
+					Janus.log("Synchronous transaction successful (" + plugindata["plugin"] + ")");
+					var data = plugindata["data"];
+					Janus.debug(data);
+					callbacks.success(data);
+					return;
+				} else if(json["janus"] !== "ack") {
+					// Not a success and not an ack, must be an error
+					if(json["error"] !== undefined && json["error"] !== null) {
+						Janus.error("Ooops: " + json["error"].code + " " + json["error"].reason);	// FIXME
+						callbacks.error(json["error"].code + " " + json["error"].reason);
+					} else {
+						Janus.error("Unknown error");	// FIXME
+						callbacks.error("Unknown error");
+					}
+					return;
+				}
+				// If we got here, the plugin decided to handle the request asynchronously
+				callbacks.success();
+			},
+			error: function(XMLHttpRequest, textStatus, errorThrown) {
+				Janus.error(textStatus + ": " + errorThrown);	// FIXME
+				callbacks.error(textStatus + ": " + errorThrown);
+			},
+			dataType: "json"
+		});
+	}
+
+	// Private method to send a trickle candidate
+	function sendTrickleCandidate(handleId, candidate) {
+		if(!connected) {
+			Janus.warn("Is the gateway down? (connected=false)");
+			return;
+		}
+		var request = { "janus": "trickle", "candidate": candidate, "transaction": Janus.randomString(12) };
+		if(token !== null && token !== undefined)
+			request["token"] = token;
+		if(apisecret !== null && apisecret !== undefined)
+			request["apisecret"] = apisecret;
+		Janus.vdebug("Sending trickle candidate (handle=" + handleId + "):");
+		Janus.vdebug(request);
+		if(websockets) {
+			request["session_id"] = sessionId;
+			request["handle_id"] = handleId;
+			ws.send(JSON.stringify(request));
+			return;
+		}
+		Janus.ajax({
+			type: 'POST',
+			url: server + "/" + sessionId + "/" + handleId,
+			withCredentials: withCredentials,
+			cache: false,
+			contentType: "application/json",
+			data: JSON.stringify(request),
+			success: function(json) {
+				Janus.vdebug("Candidate sent!");
+				Janus.vdebug(json);
+				if(json["janus"] !== "ack") {
+					Janus.error("Ooops: " + json["error"].code + " " + json["error"].reason);	// FIXME
+					return;
+				}
+			},
+			error: function(XMLHttpRequest, textStatus, errorThrown) {
+				Janus.error(textStatus + ": " + errorThrown);	// FIXME
+			},
+			dataType: "json"
+		});
+	}
+
+	// Private method to send a data channel message
+	function sendData(handleId, callbacks) {
+		callbacks = callbacks || {};
+		callbacks.success = (typeof callbacks.success == "function") ? callbacks.success : Janus.noop;
+		callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : Janus.noop;
+		var pluginHandle = pluginHandles[handleId];
+		if(pluginHandle === null || pluginHandle === undefined ||
+				pluginHandle.webrtcStuff === null || pluginHandle.webrtcStuff === undefined) {
+			Janus.warn("Invalid handle");
+			callbacks.error("Invalid handle");
+			return;
+		}
+		var config = pluginHandle.webrtcStuff;
+		var text = callbacks.text;
+		if(text === null || text === undefined) {
+			Janus.warn("Invalid text");
+			callbacks.error("Invalid text");
+			return;
+		}
+		Janus.log("Sending string on data channel: " + text);
+		config.dataChannel.send(text);
+		callbacks.success();
+	}
+
+	// Private method to send a DTMF tone
+	function sendDtmf(handleId, callbacks) {
+		callbacks = callbacks || {};
+		callbacks.success = (typeof callbacks.success == "function") ? callbacks.success : Janus.noop;
+		callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : Janus.noop;
+		var pluginHandle = pluginHandles[handleId];
+		if(pluginHandle === null || pluginHandle === undefined ||
+				pluginHandle.webrtcStuff === null || pluginHandle.webrtcStuff === undefined) {
+			Janus.warn("Invalid handle");
+			callbacks.error("Invalid handle");
+			return;
+		}
+		var config = pluginHandle.webrtcStuff;
+		if(config.dtmfSender === null || config.dtmfSender === undefined) {
+			// Create the DTMF sender, if possible
+			if(config.myStream !== undefined && config.myStream !== null) {
+				var tracks = config.myStream.getAudioTracks();
+				if(tracks !== null && tracks !== undefined && tracks.length > 0) {
+					var local_audio_track = tracks[0];
+					config.dtmfSender = config.pc.createDTMFSender(local_audio_track);
+					Janus.log("Created DTMF Sender");
+					config.dtmfSender.ontonechange = function(tone) { Janus.debug("Sent DTMF tone: " + tone.tone); };
+				}
+			}
+			if(config.dtmfSender === null || config.dtmfSender === undefined) {
+				Janus.warn("Invalid DTMF configuration");
+				callbacks.error("Invalid DTMF configuration");
+				return;
+			}
+		}
+		var dtmf = callbacks.dtmf;
+		if(dtmf === null || dtmf === undefined) {
+			Janus.warn("Invalid DTMF parameters");
+			callbacks.error("Invalid DTMF parameters");
+			return;
+		}
+		var tones = dtmf.tones;
+		if(tones === null || tones === undefined) {
+			Janus.warn("Invalid DTMF string");
+			callbacks.error("Invalid DTMF string");
+			return;
+		}
+		var duration = dtmf.duration;
+		if(duration === null || duration === undefined)
+			duration = 500;	// We choose 500ms as the default duration for a tone
+		var gap = dtmf.gap;
+		if(gap === null || gap === undefined)
+			gap = 50;	// We choose 50ms as the default gap between tones
+		Janus.debug("Sending DTMF string " + tones + " (duration " + duration + "ms, gap " + gap + "ms)");
+		config.dtmfSender.insertDTMF(tones, duration, gap);
+	}
+
+	// Private method to destroy a plugin handle
+	function destroyHandle(handleId, callbacks) {
+		callbacks = callbacks || {};
+		callbacks.success = (typeof callbacks.success == "function") ? callbacks.success : Janus.noop;
+		callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : Janus.noop;
+		var asyncRequest = true;
+		if(callbacks.asyncRequest !== undefined && callbacks.asyncRequest !== null)
+			asyncRequest = (callbacks.asyncRequest === true);
+		Janus.log("Destroying handle " + handleId + " (sync=" + asyncRequest + ")");
+		cleanupWebrtc(handleId);
+		if(!connected) {
+			Janus.warn("Is the gateway down? (connected=false)");
+			callbacks.error("Is the gateway down? (connected=false)");
+			return;
+		}
+		var request = { "janus": "detach", "transaction": Janus.randomString(12) };
+		if(token !== null && token !== undefined)
+			request["token"] = token;
+		if(apisecret !== null && apisecret !== undefined)
+			request["apisecret"] = apisecret;
+		if(websockets) {
+			request["session_id"] = sessionId;
+			request["handle_id"] = handleId;
+			ws.send(JSON.stringify(request));
+			delete pluginHandles[handleId];
+			callbacks.success();
+			return;
+		}
+		Janus.ajax({
+			type: 'POST',
+			url: server + "/" + sessionId + "/" + handleId,
+			async: asyncRequest,	// Sometimes we need false here, or destroying in onbeforeunload won't work
+			withCredentials: withCredentials,
+			cache: false,
+			contentType: "application/json",
+			data: JSON.stringify(request),
+			success: function(json) {
+				Janus.log("Destroyed handle:");
+				Janus.debug(json);
+				if(json["janus"] !== "success") {
+					Janus.error("Ooops: " + json["error"].code + " " + json["error"].reason);	// FIXME
+				}
+				delete pluginHandles[handleId];
+				callbacks.success();
+			},
+			error: function(XMLHttpRequest, textStatus, errorThrown) {
+				Janus.error(textStatus + ": " + errorThrown);	// FIXME
+				// We cleanup anyway
+				delete pluginHandles[handleId];
+				callbacks.success();
+			},
+			dataType: "json"
+		});
+	}
+
+	// WebRTC stuff
+	function streamsDone(handleId, jsep, media, callbacks, stream) {
+		var pluginHandle = pluginHandles[handleId];
+		if(pluginHandle === null || pluginHandle === undefined ||
+				pluginHandle.webrtcStuff === null || pluginHandle.webrtcStuff === undefined) {
+			Janus.warn("Invalid handle");
+			callbacks.error("Invalid handle");
+			return;
+		}
+		var config = pluginHandle.webrtcStuff;
+		Janus.debug("streamsDone:", stream);
+		config.myStream = stream;
+		var pc_config = {"iceServers": iceServers, "iceTransportPolicy": iceTransportPolicy};
+		//~ var pc_constraints = {'mandatory': {'MozDontOfferDataChannel':true}};
+		var pc_constraints = {
+			"optional": [{"DtlsSrtpKeyAgreement": true}]
+		};
+		if(ipv6Support === true) {
+			// FIXME This is only supported in Chrome right now
+			// For support in Firefox track this: https://bugzilla.mozilla.org/show_bug.cgi?id=797262
+			pc_constraints.optional.push({"googIPv6":true});
+		}
+		if(adapter.browserDetails.browser === "edge") {
+			// This is Edge, enable BUNDLE explicitly
+			pc_config.bundlePolicy = "max-bundle";
+		}
+		Janus.log("Creating PeerConnection");
+		Janus.debug(pc_constraints);
+		config.pc = new RTCPeerConnection(pc_config, pc_constraints);
+		Janus.debug(config.pc);
+		if(config.pc.getStats) {	// FIXME
+			config.volume.value = 0;
+			config.bitrate.value = "0 kbits/sec";
+		}
+		Janus.log("Preparing local SDP and gathering candidates (trickle=" + config.trickle + ")");
+		config.pc.onicecandidate = function(event) {
+			if (event.candidate == null ||
+					(adapter.browserDetails.browser === 'edge' && event.candidate.candidate.indexOf('endOfCandidates') > 0)) {
+				Janus.log("End of candidates.");
+				config.iceDone = true;
+				if(config.trickle === true) {
+					// Notify end of candidates
+					sendTrickleCandidate(handleId, {"completed": true});
+				} else {
+					// No trickle, time to send the complete SDP (including all candidates)
+					sendSDP(handleId, callbacks);
+				}
+			} else {
+				// JSON.stringify doesn't work on some WebRTC objects anymore
+				// See https://code.google.com/p/chromium/issues/detail?id=467366
+				var candidate = {
+					"candidate": event.candidate.candidate,
+					"sdpMid": event.candidate.sdpMid,
+					"sdpMLineIndex": event.candidate.sdpMLineIndex
+				};
+				if(config.trickle === true) {
+					// Send candidate
+					sendTrickleCandidate(handleId, candidate);
+				}
+			}
+		};
+		if(stream !== null && stream !== undefined) {
+			Janus.log('Adding local stream');
+			config.pc.addStream(stream);
+			pluginHandle.onlocalstream(stream);
+		}
+		config.pc.onaddstream = function(remoteStream) {
+			Janus.log("Handling Remote Stream");
+			Janus.debug(remoteStream);
+			config.remoteStream = remoteStream;
+			pluginHandle.onremotestream(remoteStream.stream);
+		};
+		// Any data channel to create?
+		if(isDataEnabled(media)) {
+			Janus.log("Creating data channel");
+			var onDataChannelMessage = function(event) {
+				Janus.log('Received message on data channel: ' + event.data);
+				pluginHandle.ondata(event.data);	// FIXME
+			}
+			var onDataChannelStateChange = function() {
+				var dcState = config.dataChannel !== null ? config.dataChannel.readyState : "null";
+				Janus.log('State change on data channel: ' + dcState);
+				if(dcState === 'open') {
+					pluginHandle.ondataopen();	// FIXME
+				}
+			}
+			var onDataChannelError = function(error) {
+				Janus.error('Got error on data channel:', error);
+				// TODO
+			}
+			// Until we implement the proxying of open requests within the Janus core, we open a channel ourselves whatever the case
+			config.dataChannel = config.pc.createDataChannel("JanusDataChannel", {ordered:false});	// FIXME Add options (ordered, maxRetransmits, etc.)
+			config.dataChannel.onmessage = onDataChannelMessage;
+			config.dataChannel.onopen = onDataChannelStateChange;
+			config.dataChannel.onclose = onDataChannelStateChange;
+			config.dataChannel.onerror = onDataChannelError;
+		}
+		// Create offer/answer now
+		if(jsep === null || jsep === undefined) {
+			createOffer(handleId, media, callbacks);
+		} else {
+			if(adapter.browserDetails.browser === "edge") {
+				// This is Edge, add an a=end-of-candidates at the end
+				jsep.sdp += "a=end-of-candidates\r\n";
+			}
+			config.pc.setRemoteDescription(
+					new RTCSessionDescription(jsep),
+					function() {
+						Janus.log("Remote description accepted!");
+						createAnswer(handleId, media, callbacks);
+					}, callbacks.error);
+		}
+	}
+
+	function prepareWebrtc(handleId, callbacks) {
+		callbacks = callbacks || {};
+		callbacks.success = (typeof callbacks.success == "function") ? callbacks.success : Janus.noop;
+		callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : webrtcError;
+		var jsep = callbacks.jsep;
+		var media = callbacks.media;
+		var pluginHandle = pluginHandles[handleId];
+		if(pluginHandle === null || pluginHandle === undefined ||
+				pluginHandle.webrtcStuff === null || pluginHandle.webrtcStuff === undefined) {
+			Janus.warn("Invalid handle");
+			callbacks.error("Invalid handle");
+			return;
+		}
+		var config = pluginHandle.webrtcStuff;
+		// Are we updating a session?
+		if(config.pc !== undefined && config.pc !== null) {
+			Janus.log("Updating existing media session");
+			// Create offer/answer now
+			if(jsep === null || jsep === undefined) {
+				createOffer(handleId, media, callbacks);
+			} else {
+				if(adapter.browserDetails.browser === "edge") {
+					// This is Edge, add an a=end-of-candidates at the end
+					jsep.sdp += "a=end-of-candidates\r\n";
+				}
+				config.pc.setRemoteDescription(
+						new RTCSessionDescription(jsep),
+						function() {
+							Janus.log("Remote description accepted!");
+							createAnswer(handleId, media, callbacks);
+						}, callbacks.error);
+			}
+			return;
+		}
+		// Was a MediaStream object passed, or do we need to take care of that?
+		if(callbacks.stream !== null && callbacks.stream !== undefined) {
+			var stream = callbacks.stream;
+			Janus.log("MediaStream provided by the application");
+			Janus.debug(stream);
+			// Skip the getUserMedia part
+			config.streamExternal = true;
+			streamsDone(handleId, jsep, media, callbacks, stream);
+			return;
+		}
+		config.trickle = isTrickleEnabled(callbacks.trickle);
+		if(isAudioSendEnabled(media) || isVideoSendEnabled(media)) {
+			var constraints = { mandatory: {}, optional: []};
+			pluginHandle.consentDialog(true);
+			var audioSupport = isAudioSendEnabled(media);
+			if(audioSupport === true && media != undefined && media != null) {
+				if(typeof media.audio === 'object') {
+					audioSupport = media.audio;
+				}
+			}
+			var videoSupport = isVideoSendEnabled(media);
+			if(videoSupport === true && media != undefined && media != null) {
+				if(media.video && media.video != 'screen' && media.video != 'window') {
+					var width = 0;
+					var height = 0, maxHeight = 0;
+					if(media.video === 'lowres') {
+						// Small resolution, 4:3
+						height = 240;
+						maxHeight = 240;
+						width = 320;
+					} else if(media.video === 'lowres-16:9') {
+						// Small resolution, 16:9
+						height = 180;
+						maxHeight = 180;
+						width = 320;
+					} else if(media.video === 'hires' || media.video === 'hires-16:9' ) {
+						// High resolution is only 16:9
+						height = 720;
+						maxHeight = 720;
+						width = 1280;
+						if(navigator.mozGetUserMedia) {
+							var firefoxVer = parseInt(window.navigator.userAgent.match(/Firefox\/(.*)/)[1], 10);
+							if(firefoxVer < 38) {
+								// Unless this is and old Firefox, which doesn't support it
+								Janus.warn(media.video + " unsupported, falling back to stdres (old Firefox)");
+								height = 480;
+								maxHeight = 480;
+								width  = 640;
+							}
+						}
+					} else if(media.video === 'stdres') {
+						// Normal resolution, 4:3
+						height = 480;
+						maxHeight = 480;
+						width  = 640;
+					} else if(media.video === 'stdres-16:9') {
+						// Normal resolution, 16:9
+						height = 360;
+						maxHeight = 360;
+						width = 640;
+					} else {
+						Janus.log("Default video setting (" + media.video + ") is stdres 4:3");
+						height = 480;
+						maxHeight = 480;
+						width = 640;
+					}
+					Janus.log("Adding media constraint " + media.video);
+					if(navigator.mozGetUserMedia) {
+						var firefoxVer = parseInt(window.navigator.userAgent.match(/Firefox\/(.*)/)[1], 10);
+						if(firefoxVer < 38) {
+							videoSupport = {
+								'require': ['height', 'width'],
+								'height': {'max': maxHeight, 'min': height},
+								'width':  {'max': width,  'min': width}
+							};
+						} else {
+							// http://stackoverflow.com/questions/28282385/webrtc-firefox-constraints/28911694#28911694
+							// https://github.com/meetecho/janus-gateway/pull/246
+							videoSupport = {
+								'height': {'ideal': height},
+								'width':  {'ideal': width}
+							};
+						}
+					} else {
+						videoSupport = {
+						    'mandatory': {
+						        'maxHeight': maxHeight,
+						        'minHeight': height,
+						        'maxWidth':  width,
+						        'minWidth':  width
+						    },
+						    'optional': []
+						};
+					}
+					if(typeof media.video === 'object') {
+						videoSupport = media.video;
+					}
+					Janus.debug(videoSupport);
+				} else if(media.video === 'screen' || media.video === 'window') {
+					// Not a webcam, but screen capture
+					if(window.location.protocol !== 'https:') {
+						// Screen sharing mandates HTTPS
+						Janus.warn("Screen sharing only works on HTTPS, try the https:// version of this page");
+						pluginHandle.consentDialog(false);
+						callbacks.error("Screen sharing only works on HTTPS, try the https:// version of this page");
+						return;
+					}
+					// We're going to try and use the extension for Chrome 34+, the old approach
+					// for older versions of Chrome, or the experimental support in Firefox 33+
+					var cache = {};
+					function callbackUserMedia (error, stream) {
+						pluginHandle.consentDialog(false);
+						if(error) {
+							callbacks.error({code: error.code, name: error.name, message: error.message});
+						} else {
+							streamsDone(handleId, jsep, media, callbacks, stream);
+						}
+					};
+					function getScreenMedia(constraints, gsmCallback) {
+						Janus.log("Adding media constraint (screen capture)");
+						Janus.debug(constraints);
+						navigator.mediaDevices.getUserMedia(constraints)
+							.then(function(stream) { gsmCallback(null, stream); })
+							.catch(function(error) { pluginHandle.consentDialog(false); gsmCallback(error); });
+					};
+					if(adapter.browserDetails.browser === 'chrome') {
+						var chromever = adapter.browserDetails.version;
+						var maxver = 33;
+						if(window.navigator.userAgent.match('Linux'))
+							maxver = 35;	// "known" crash in chrome 34 and 35 on linux
+						if(chromever >= 26 && chromever <= maxver) {
+							// Chrome 26->33 requires some awkward chrome://flags manipulation
+							constraints = {
+								video: {
+									mandatory: {
+										googLeakyBucket: true,
+										maxWidth: window.screen.width,
+										maxHeight: window.screen.height,
+										maxFrameRate: 3,
+										chromeMediaSource: 'screen'
+									}
+								},
+								audio: isAudioSendEnabled(media)
+							};
+							getScreenMedia(constraints, callbackUserMedia);
+						} else {
+							// Chrome 34+ requires an extension
+							var pending = window.setTimeout(
+								function () {
+									error = new Error('NavigatorUserMediaError');
+									error.name = 'The required Chrome extension is not installed: click <a href="#">here</a> to install it. (NOTE: this will need you to refresh the page)';
+									pluginHandle.consentDialog(false);
+									return callbacks.error(error);
+								}, 1000);
+							cache[pending] = [callbackUserMedia, null];
+							window.postMessage({ type: 'janusGetScreen', id: pending }, '*');
+						}
+					} else if (window.navigator.userAgent.match('Firefox')) {
+						var ffver = parseInt(window.navigator.userAgent.match(/Firefox\/(.*)/)[1], 10);
+						if(ffver >= 33) {
+							// Firefox 33+ has experimental support for screen sharing
+							constraints = {
+								video: {
+									mozMediaSource: media.video,
+									mediaSource: media.video
+								},
+								audio: isAudioSendEnabled(media)
+							};
+							getScreenMedia(constraints, function (err, stream) {
+								callbackUserMedia(err, stream);
+								// Workaround for https://bugzilla.mozilla.org/show_bug.cgi?id=1045810
+								if (!err) {
+									var lastTime = stream.currentTime;
+									var polly = window.setInterval(function () {
+										if(!stream)
+											window.clearInterval(polly);
+										if(stream.currentTime == lastTime) {
+											window.clearInterval(polly);
+											if(stream.onended) {
+												stream.onended();
+											}
+										}
+										lastTime = stream.currentTime;
+									}, 500);
+								}
+							});
+						} else {
+							var error = new Error('NavigatorUserMediaError');
+							error.name = 'Your version of Firefox does not support screen sharing, please install Firefox 33 (or more recent versions)';
+							pluginHandle.consentDialog(false);
+							callbacks.error(error);
+							return;
+						}
+					}
+
+					// Wait for events from the Chrome Extension
+					window.addEventListener('message', function (event) {
+						if(event.origin != window.location.origin)
+							return;
+						if(event.data.type == 'janusGotScreen' && cache[event.data.id]) {
+							var data = cache[event.data.id];
+							var callback = data[0];
+							delete cache[event.data.id];
+
+							if (event.data.sourceId === '') {
+								// user canceled
+								var error = new Error('NavigatorUserMediaError');
+								error.name = 'You cancelled the request for permission, giving up...';
+								pluginHandle.consentDialog(false);
+								callbacks.error(error);
+							} else {
+								constraints = {
+									audio: isAudioSendEnabled(media),
+									video: {
+										mandatory: {
+											chromeMediaSource: 'desktop',
+											maxWidth: window.screen.width,
+											maxHeight: window.screen.height,
+											maxFrameRate: 3
+										},
+										optional: [
+											{googLeakyBucket: true},
+											{googTemporalLayeredScreencast: true}
+										]
+									}
+								};
+								constraints.video.mandatory.chromeMediaSourceId = event.data.sourceId;
+								getScreenMedia(constraints, callback);
+							}
+						} else if (event.data.type == 'janusGetScreenPending') {
+							window.clearTimeout(event.data.id);
+						}
+					});
+					return;
+				}
+			}
+			// If we got here, we're not screensharing
+			if(media === null || media === undefined || media.video !== 'screen') {
+				// Check whether all media sources are actually available or not
+				navigator.mediaDevices.enumerateDevices().then(function(devices) {
+					var audioExist = devices.some(function(device) {
+						return device.kind === 'audioinput';
+					}),
+					videoExist = devices.some(function(device) {
+						return device.kind === 'videoinput';
+					});
+
+					// Check whether a missing device is really a problem
+					var audioSend = isAudioSendEnabled(media);
+					var videoSend = isVideoSendEnabled(media);
+					var needAudioDevice = isAudioSendRequired(media);
+					var needVideoDevice = isVideoSendRequired(media);
+					if(audioSend || videoSend || needAudioDevice || needVideoDevice) {
+						// We need to send either audio or video
+						var haveAudioDevice = audioSend ? audioExist : false;
+						var haveVideoDevice = videoSend ? videoExist : false;
+						if(!haveAudioDevice && !haveVideoDevice) {
+							// FIXME Should we really give up, or just assume recvonly for both?
+							pluginHandle.consentDialog(false);
+							callbacks.error('No capture device found');
+							return false;
+						} else if(!haveAudioDevice && needAudioDevice) {
+							pluginHandle.consentDialog(false);
+							callbacks.error('Audio capture is required, but no capture device found');
+							return false;
+						} else if(!haveVideoDevice && needVideoDevice) {
+							pluginHandle.consentDialog(false);
+							callbacks.error('Video capture is required, but no capture device found');
+							return false;
+						}
+					}
+
+					navigator.mediaDevices.getUserMedia({
+						audio: audioExist ? audioSupport : false,
+						video: videoExist ? videoSupport : false
+					})
+					.then(function(stream) { pluginHandle.consentDialog(false); streamsDone(handleId, jsep, media, callbacks, stream); })
+					.catch(function(error) { pluginHandle.consentDialog(false); callbacks.error({code: error.code, name: error.name, message: error.message}); });
+				})
+				.catch(function(error) {
+					pluginHandle.consentDialog(false);
+					callbacks.error('enumerateDevices error', error);
+				});
+			}
+		} else {
+			// No need to do a getUserMedia, create offer/answer right away
+			streamsDone(handleId, jsep, media, callbacks);
+		}
+	}
+
+	function prepareWebrtcPeer(handleId, callbacks) {
+		callbacks = callbacks || {};
+		callbacks.success = (typeof callbacks.success == "function") ? callbacks.success : Janus.noop;
+		callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : webrtcError;
+		var jsep = callbacks.jsep;
+		var pluginHandle = pluginHandles[handleId];
+		if(pluginHandle === null || pluginHandle === undefined ||
+				pluginHandle.webrtcStuff === null || pluginHandle.webrtcStuff === undefined) {
+			Janus.warn("Invalid handle");
+			callbacks.error("Invalid handle");
+			return;
+		}
+		var config = pluginHandle.webrtcStuff;
+		if(jsep !== undefined && jsep !== null) {
+			if(config.pc === null) {
+				Janus.warn("Wait, no PeerConnection?? if this is an answer, use createAnswer and not handleRemoteJsep");
+				callbacks.error("No PeerConnection: if this is an answer, use createAnswer and not handleRemoteJsep");
+				return;
+			}
+			if(adapter.browserDetails.browser === "edge") {
+				// This is Edge, add an a=end-of-candidates at the end
+				jsep.sdp += "a=end-of-candidates\r\n";
+			}
+			config.pc.setRemoteDescription(
+					new RTCSessionDescription(jsep),
+					function() {
+						Janus.log("Remote description accepted!");
+						callbacks.success();
+					}, callbacks.error);
+		} else {
+			callbacks.error("Invalid JSEP");
+		}
+	}
+
+	function createOffer(handleId, media, callbacks) {
+		callbacks = callbacks || {};
+		callbacks.success = (typeof callbacks.success == "function") ? callbacks.success : Janus.noop;
+		callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : Janus.noop;
+		var pluginHandle = pluginHandles[handleId];
+		if(pluginHandle === null || pluginHandle === undefined ||
+				pluginHandle.webrtcStuff === null || pluginHandle.webrtcStuff === undefined) {
+			Janus.warn("Invalid handle");
+			callbacks.error("Invalid handle");
+			return;
+		}
+		var config = pluginHandle.webrtcStuff;
+		Janus.log("Creating offer (iceDone=" + config.iceDone + ")");
+		// https://code.google.com/p/webrtc/issues/detail?id=3508
+		var mediaConstraints = null;
+		if(adapter.browserDetails.browser == "firefox" || adapter.browserDetails.browser == "edge") {
+			mediaConstraints = {
+				'offerToReceiveAudio':isAudioRecvEnabled(media),
+				'offerToReceiveVideo':isVideoRecvEnabled(media)
+			};
+		} else {
+			mediaConstraints = {
+				'mandatory': {
+					'OfferToReceiveAudio':isAudioRecvEnabled(media),
+					'OfferToReceiveVideo':isVideoRecvEnabled(media)
+				}
+			};
+		}
+		Janus.debug(mediaConstraints);
+		config.pc.createOffer(
+			function(offer) {
+				Janus.debug(offer);
+				if(config.mySdp === null || config.mySdp === undefined) {
+					Janus.log("Setting local description");
+					config.mySdp = offer.sdp;
+					config.pc.setLocalDescription(offer);
+				}
+				if(!config.iceDone && !config.trickle) {
+					// Don't do anything until we have all candidates
+					Janus.log("Waiting for all candidates...");
+					return;
+				}
+				if(config.sdpSent) {
+					Janus.log("Offer already sent, not sending it again");
+					return;
+				}
+				Janus.log("Offer ready");
+				Janus.debug(callbacks);
+				config.sdpSent = true;
+				// JSON.stringify doesn't work on some WebRTC objects anymore
+				// See https://code.google.com/p/chromium/issues/detail?id=467366
+				var jsep = {
+					"type": offer.type,
+					"sdp": offer.sdp
+				};
+				callbacks.success(jsep);
+			}, callbacks.error, mediaConstraints);
+	}
+
+	function createAnswer(handleId, media, callbacks) {
+		callbacks = callbacks || {};
+		callbacks.success = (typeof callbacks.success == "function") ? callbacks.success : Janus.noop;
+		callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : Janus.noop;
+		var pluginHandle = pluginHandles[handleId];
+		if(pluginHandle === null || pluginHandle === undefined ||
+				pluginHandle.webrtcStuff === null || pluginHandle.webrtcStuff === undefined) {
+			Janus.warn("Invalid handle");
+			callbacks.error("Invalid handle");
+			return;
+		}
+		var config = pluginHandle.webrtcStuff;
+		Janus.log("Creating answer (iceDone=" + config.iceDone + ")");
+		var mediaConstraints = null;
+		if(adapter.browserDetails.browser == "firefox" || adapter.browserDetails.browser == "edge") {
+			mediaConstraints = {
+				'offerToReceiveAudio':isAudioRecvEnabled(media),
+				'offerToReceiveVideo':isVideoRecvEnabled(media)
+			};
+		} else {
+			mediaConstraints = {
+				'mandatory': {
+					'OfferToReceiveAudio':isAudioRecvEnabled(media),
+					'OfferToReceiveVideo':isVideoRecvEnabled(media)
+				}
+			};
+		}
+		Janus.debug(mediaConstraints);
+		config.pc.createAnswer(
+			function(answer) {
+				Janus.debug(answer);
+				if(config.mySdp === null || config.mySdp === undefined) {
+					Janus.log("Setting local description");
+					config.mySdp = answer.sdp;
+					config.pc.setLocalDescription(answer);
+				}
+				if(!config.iceDone && !config.trickle) {
+					// Don't do anything until we have all candidates
+					Janus.log("Waiting for all candidates...");
+					return;
+				}
+				if(config.sdpSent) {	// FIXME badly
+					Janus.log("Answer already sent, not sending it again");
+					return;
+				}
+				config.sdpSent = true;
+				// JSON.stringify doesn't work on some WebRTC objects anymore
+				// See https://code.google.com/p/chromium/issues/detail?id=467366
+				var jsep = {
+					"type": answer.type,
+					"sdp": answer.sdp
+				};
+				callbacks.success(jsep);
+			}, callbacks.error, mediaConstraints);
+	}
+
+	function sendSDP(handleId, callbacks) {
+		callbacks = callbacks || {};
+		callbacks.success = (typeof callbacks.success == "function") ? callbacks.success : Janus.noop;
+		callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : Janus.noop;
+		var pluginHandle = pluginHandles[handleId];
+		if(pluginHandle === null || pluginHandle === undefined ||
+				pluginHandle.webrtcStuff === null || pluginHandle.webrtcStuff === undefined) {
+			Janus.warn("Invalid handle, not sending anything");
+			return;
+		}
+		var config = pluginHandle.webrtcStuff;
+		Janus.log("Sending offer/answer SDP...");
+		if(config.mySdp === null || config.mySdp === undefined) {
+			Janus.warn("Local SDP instance is invalid, not sending anything...");
+			return;
+		}
+		config.mySdp = {
+			"type": config.pc.localDescription.type,
+			"sdp": config.pc.localDescription.sdp
+		};
+		if(config.sdpSent) {
+			Janus.log("Offer/Answer SDP already sent, not sending it again");
+			return;
+		}
+		if(config.trickle === false)
+			config.mySdp["trickle"] = false;
+		Janus.debug(callbacks);
+		config.sdpSent = true;
+		callbacks.success(config.mySdp);
+	}
+
+	function getVolume(handleId) {
+		var pluginHandle = pluginHandles[handleId];
+		if(pluginHandle === null || pluginHandle === undefined ||
+				pluginHandle.webrtcStuff === null || pluginHandle.webrtcStuff === undefined) {
+			Janus.warn("Invalid handle");
+			return 0;
+		}
+		var config = pluginHandle.webrtcStuff;
+		// Start getting the volume, if getStats is supported
+		if(config.pc.getStats && adapter.browserDetails.browser == "chrome") {	// FIXME
+			if(config.remoteStream === null || config.remoteStream === undefined) {
+				Janus.warn("Remote stream unavailable");
+				return 0;
+			}
+			// http://webrtc.googlecode.com/svn/trunk/samples/js/demos/html/constraints-and-stats.html
+			if(config.volume.timer === null || config.volume.timer === undefined) {
+				Janus.log("Starting volume monitor");
+				config.volume.timer = setInterval(function() {
+					config.pc.getStats(function(stats) {
+						var results = stats.result();
+						for(var i=0; i<results.length; i++) {
+							var res = results[i];
+							if(res.type == 'ssrc' && res.stat('audioOutputLevel')) {
+								config.volume.value = res.stat('audioOutputLevel');
+							}
+						}
+					});
+				}, 200);
+				return 0;	// We don't have a volume to return yet
+			}
+			return config.volume.value;
+		} else {
+			Janus.log("Getting the remote volume unsupported by browser");
+			return 0;
+		}
+	}
+
+	function isMuted(handleId, video) {
+		var pluginHandle = pluginHandles[handleId];
+		if(pluginHandle === null || pluginHandle === undefined ||
+				pluginHandle.webrtcStuff === null || pluginHandle.webrtcStuff === undefined) {
+			Janus.warn("Invalid handle");
+			return true;
+		}
+		var config = pluginHandle.webrtcStuff;
+		if(config.pc === null || config.pc === undefined) {
+			Janus.warn("Invalid PeerConnection");
+			return true;
+		}
+		if(config.myStream === undefined || config.myStream === null) {
+			Janus.warn("Invalid local MediaStream");
+			return true;
+		}
+		if(video) {
+			// Check video track
+			if(config.myStream.getVideoTracks() === null
+					|| config.myStream.getVideoTracks() === undefined
+					|| config.myStream.getVideoTracks().length === 0) {
+				Janus.warn("No video track");
+				return true;
+			}
+			return !config.myStream.getVideoTracks()[0].enabled;
+		} else {
+			// Check audio track
+			if(config.myStream.getAudioTracks() === null
+					|| config.myStream.getAudioTracks() === undefined
+					|| config.myStream.getAudioTracks().length === 0) {
+				Janus.warn("No audio track");
+				return true;
+			}
+			return !config.myStream.getAudioTracks()[0].enabled;
+		}
+	}
+
+	function mute(handleId, video, mute) {
+		var pluginHandle = pluginHandles[handleId];
+		if(pluginHandle === null || pluginHandle === undefined ||
+				pluginHandle.webrtcStuff === null || pluginHandle.webrtcStuff === undefined) {
+			Janus.warn("Invalid handle");
+			return false;
+		}
+		var config = pluginHandle.webrtcStuff;
+		if(config.pc === null || config.pc === undefined) {
+			Janus.warn("Invalid PeerConnection");
+			return false;
+		}
+		if(config.myStream === undefined || config.myStream === null) {
+			Janus.warn("Invalid local MediaStream");
+			return false;
+		}
+		if(video) {
+			// Mute/unmute video track
+			if(config.myStream.getVideoTracks() === null
+					|| config.myStream.getVideoTracks() === undefined
+					|| config.myStream.getVideoTracks().length === 0) {
+				Janus.warn("No video track");
+				return false;
+			}
+			config.myStream.getVideoTracks()[0].enabled = mute ? false : true;
+			return true;
+		} else {
+			// Mute/unmute audio track
+			if(config.myStream.getAudioTracks() === null
+					|| config.myStream.getAudioTracks() === undefined
+					|| config.myStream.getAudioTracks().length === 0) {
+				Janus.warn("No audio track");
+				return false;
+			}
+			config.myStream.getAudioTracks()[0].enabled = mute ? false : true;
+			return true;
+		}
+	}
+
+	function getBitrate(handleId) {
+		var pluginHandle = pluginHandles[handleId];
+		if(pluginHandle === null || pluginHandle === undefined ||
+				pluginHandle.webrtcStuff === null || pluginHandle.webrtcStuff === undefined) {
+			Janus.warn("Invalid handle");
+			return "Invalid handle";
+		}
+		var config = pluginHandle.webrtcStuff;
+		if(config.pc === null || config.pc === undefined)
+			return "Invalid PeerConnection";
+		// Start getting the bitrate, if getStats is supported
+		if(config.pc.getStats && adapter.browserDetails.browser == "chrome") {
+			// Do it the Chrome way
+			if(config.remoteStream === null || config.remoteStream === undefined) {
+				Janus.warn("Remote stream unavailable");
+				return "Remote stream unavailable";
+			}
+			// http://webrtc.googlecode.com/svn/trunk/samples/js/demos/html/constraints-and-stats.html
+			if(config.bitrate.timer === null || config.bitrate.timer === undefined) {
+				Janus.log("Starting bitrate timer (Chrome)");
+				config.bitrate.timer = setInterval(function() {
+					config.pc.getStats(function(stats) {
+						var results = stats.result();
+						for(var i=0; i<results.length; i++) {
+							var res = results[i];
+							if(res.type == 'ssrc' && res.stat('googFrameHeightReceived')) {
+								config.bitrate.bsnow = res.stat('bytesReceived');
+								config.bitrate.tsnow = res.timestamp;
+								if(config.bitrate.bsbefore === null || config.bitrate.tsbefore === null) {
+									// Skip this round
+									config.bitrate.bsbefore = config.bitrate.bsnow;
+									config.bitrate.tsbefore = config.bitrate.tsnow;
+								} else {
+									// Calculate bitrate
+									var bitRate = Math.round((config.bitrate.bsnow - config.bitrate.bsbefore) * 8 / (config.bitrate.tsnow - config.bitrate.tsbefore));
+									config.bitrate.value = bitRate + ' kbits/sec';
+									//~ Janus.log("Estimated bitrate is " + config.bitrate.value);
+									config.bitrate.bsbefore = config.bitrate.bsnow;
+									config.bitrate.tsbefore = config.bitrate.tsnow;
+								}
+							}
+						}
+					});
+				}, 1000);
+				return "0 kbits/sec";	// We don't have a bitrate value yet
+			}
+			return config.bitrate.value;
+		} else if(config.pc.getStats && adapter.browserDetails.browser == "firefox") {
+			// Do it the Firefox way
+			if(config.remoteStream === null || config.remoteStream === undefined
+					|| config.remoteStream.stream === null || config.remoteStream.stream === undefined) {
+				Janus.warn("Remote stream unavailable");
+				return "Remote stream unavailable";
+			}
+			var videoTracks = config.remoteStream.stream.getVideoTracks();
+			if(videoTracks === null || videoTracks === undefined || videoTracks.length < 1) {
+				Janus.warn("No video track");
+				return "No video track";
+			}
+			// https://github.com/muaz-khan/getStats/blob/master/getStats.js
+			if(config.bitrate.timer === null || config.bitrate.timer === undefined) {
+				Janus.log("Starting bitrate timer (Firefox)");
+				config.bitrate.timer = setInterval(function() {
+					// We need a helper callback
+					var cb = function(res) {
+						if(res === null || res === undefined ||
+								res.inbound_rtp_video_1 == null || res.inbound_rtp_video_1 == null) {
+							config.bitrate.value = "Missing inbound_rtp_video_1";
+							return;
+						}
+						config.bitrate.bsnow = res.inbound_rtp_video_1.bytesReceived;
+						config.bitrate.tsnow = res.inbound_rtp_video_1.timestamp;
+						if(config.bitrate.bsbefore === null || config.bitrate.tsbefore === null) {
+							// Skip this round
+							config.bitrate.bsbefore = config.bitrate.bsnow;
+							config.bitrate.tsbefore = config.bitrate.tsnow;
+						} else {
+							// Calculate bitrate
+							var bitRate = Math.round((config.bitrate.bsnow - config.bitrate.bsbefore) * 8 / (config.bitrate.tsnow - config.bitrate.tsbefore));
+							config.bitrate.value = bitRate + ' kbits/sec';
+							config.bitrate.bsbefore = config.bitrate.bsnow;
+							config.bitrate.tsbefore = config.bitrate.tsnow;
+						}
+					};
+					// Actually get the stats
+					config.pc.getStats(videoTracks[0], function(stats) {
+						cb(stats);
+					}, cb);
+				}, 1000);
+				return "0 kbits/sec";	// We don't have a bitrate value yet
+			}
+			return config.bitrate.value;
+		} else {
+			Janus.warn("Getting the video bitrate unsupported by browser");
+			return "Feature unsupported by browser";
+		}
+	}
+
+	function webrtcError(error) {
+		Janus.error("WebRTC error:", error);
+	}
+
+	function cleanupWebrtc(handleId, hangupRequest) {
+		Janus.log("Cleaning WebRTC stuff");
+		var pluginHandle = pluginHandles[handleId];
+		if(pluginHandle === null || pluginHandle === undefined) {
+			// Nothing to clean
+			return;
+		}
+		var config = pluginHandle.webrtcStuff;
+		if(config !== null && config !== undefined) {
+			if(hangupRequest === true) {
+				// Send a hangup request (we don't really care about the response)
+				var request = { "janus": "hangup", "transaction": Janus.randomString(12) };
+				if(token !== null && token !== undefined)
+					request["token"] = token;
+				if(apisecret !== null && apisecret !== undefined)
+					request["apisecret"] = apisecret;
+				Janus.debug("Sending hangup request (handle=" + handleId + "):");
+				Janus.debug(request);
+				if(websockets) {
+					request["session_id"] = sessionId;
+					request["handle_id"] = handleId;
+					ws.send(JSON.stringify(request));
+				} else {
+					Janus.ajax({
+						type: 'POST',
+						url: server + "/" + sessionId + "/" + handleId,
+						withCredentials: withCredentials,
+						cache: false,
+						contentType: "application/json",
+						data: JSON.stringify(request),
+						dataType: "json"
+					});
+				}
+			}
+			// Cleanup stack
+			config.remoteStream = null;
+			if(config.volume.timer)
+				clearInterval(config.volume.timer);
+			config.volume.value = null;
+			if(config.bitrate.timer)
+				clearInterval(config.bitrate.timer);
+			config.bitrate.timer = null;
+			config.bitrate.bsnow = null;
+			config.bitrate.bsbefore = null;
+			config.bitrate.tsnow = null;
+			config.bitrate.tsbefore = null;
+			config.bitrate.value = null;
+			try {
+				// Try a MediaStream.stop() first
+				if(!config.streamExternal && config.myStream !== null && config.myStream !== undefined) {
+					Janus.log("Stopping local stream");
+					config.myStream.stop();
+				}
+			} catch(e) {
+				// Do nothing if this fails
+			}
+			try {
+				// Try a MediaStreamTrack.stop() for each track as well
+				if(!config.streamExternal && config.myStream !== null && config.myStream !== undefined) {
+					Janus.log("Stopping local stream tracks");
+					var tracks = config.myStream.getTracks();
+					for(var i in tracks) {
+						var mst = tracks[i];
+						Janus.log(mst);
+						if(mst !== null && mst !== undefined)
+							mst.stop();
+					}
+				}
+			} catch(e) {
+				// Do nothing if this fails
+			}
+			config.streamExternal = false;
+			config.myStream = null;
+			// Close PeerConnection
+			try {
+				config.pc.close();
+			} catch(e) {
+				// Do nothing
+			}
+			config.pc = null;
+			config.mySdp = null;
+			config.iceDone = false;
+			config.sdpSent = false;
+			config.dataChannel = null;
+			config.dtmfSender = null;
+		}
+		pluginHandle.oncleanup();
+	}
+
+	// Helper methods to parse a media object
+	function isAudioSendEnabled(media) {
+		Janus.debug("isAudioSendEnabled:", media);
+		if(media === undefined || media === null)
+			return true;	// Default
+		if(media.audio === false)
+			return false;	// Generic audio has precedence
+		if(media.audioSend === undefined || media.audioSend === null)
+			return true;	// Default
+		return (media.audioSend === true);
+	}
+
+	function isAudioSendRequired(media) {
+		Janus.debug("isAudioSendRequired:", media);
+		if(media === undefined || media === null)
+			return false;	// Default
+		if(media.audio === false || media.audioSend === false)
+			return false;	// If we're not asking to capture audio, it's not required
+		if(media.failIfNoAudio === undefined || media.failIfNoAudio === null)
+			return false;	// Default
+		return (media.failIfNoAudio === true);
+	}
+
+	function isAudioRecvEnabled(media) {
+		Janus.debug("isAudioRecvEnabled:", media);
+		if(media === undefined || media === null)
+			return true;	// Default
+		if(media.audio === false)
+			return false;	// Generic audio has precedence
+		if(media.audioRecv === undefined || media.audioRecv === null)
+			return true;	// Default
+		return (media.audioRecv === true);
+	}
+
+	function isVideoSendEnabled(media) {
+		Janus.debug("isVideoSendEnabled:", media);
+		if(media === undefined || media === null)
+			return true;	// Default
+		if(media.video === false)
+			return false;	// Generic video has precedence
+		if(media.videoSend === undefined || media.videoSend === null)
+			return true;	// Default
+		return (media.videoSend === true);
+	}
+
+	function isVideoSendRequired(media) {
+		Janus.debug("isVideoSendRequired:", media);
+		if(media === undefined || media === null)
+			return false;	// Default
+		if(media.video === false || media.videoSend === false)
+			return false;	// If we're not asking to capture video, it's not required
+		if(media.failIfNoVideo === undefined || media.failIfNoVideo === null)
+			return false;	// Default
+		return (media.failIfNoVideo === true);
+	}
+
+	function isVideoRecvEnabled(media) {
+		Janus.debug("isVideoRecvEnabled:", media);
+		if(media === undefined || media === null)
+			return true;	// Default
+		if(media.video === false)
+			return false;	// Generic video has precedence
+		if(media.videoRecv === undefined || media.videoRecv === null)
+			return true;	// Default
+		return (media.videoRecv === true);
+	}
+
+	function isDataEnabled(media) {
+		Janus.debug("isDataEnabled:", media);
+		if(adapter.browserDetails.browser == "edge") {
+			Janus.warn("Edge doesn't support data channels yet");
+			return false;
+		}
+		if(media === undefined || media === null)
+			return false;	// Default
+		return (media.data === true);
+	}
+
+	function isTrickleEnabled(trickle) {
+		Janus.debug("isTrickleEnabled:", trickle);
+		if(trickle === undefined || trickle === null)
+			return true;	// Default is true
+		return (trickle === true);
+	}
+};
-- 
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