/*
  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 ($('#janus-extension-installed').length > 0);
  } 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.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.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 "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', '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) {
        getUserMedia({ audio: true, video: true }, 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) {}
          });
        }, function(err) {
          Janus.error(err);
          callback([]);
        });
      } else {
        Janus.warn("navigator.mediaDevices unavailable");
        callback([]);
      }
    }
    // Detect tab close
    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();
        }
      }
    }
    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) {
      if(src === 'jquery.min.js') {
        if(window.jQuery) {
          // Already loaded
          done();
          return;
        }
      }
      if(src === 'adapter.js') {
        if(window.getUserMedia && window.RTCPeerConnection) {
          // Already loaded
          done();
          return;
        }
      }
      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", "jquery.min.js"]);
  }
};

// Helper method to check whether WebRTC is supported by this browser
Janus.isWebrtcSupported = function() {
  return window.RTCPeerConnection && window.getUserMedia;
};

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 : jQuery.noop;
  gatewayCallbacks.error = (typeof gatewayCallbacks.error == "function") ? gatewayCallbacks.error : jQuery.noop;
  gatewayCallbacks.destroyed = (typeof gatewayCallbacks.destroyed == "function") ? gatewayCallbacks.destroyed : jQuery.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($.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 = [{"url": "stun:stun.l.google.com:19302"}];
  // Whether IPv6 candidates should be gathered
  var ipv6Support = gatewayCallbacks.ipv6;
  if(ipv6Support === undefined || ipv6Support === null)
    ipv6Support = false;
  // 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); };
  this.attach = function(callbacks) { createHandle(callbacks); };

  // Private method to create random identifiers (e.g., transaction)
  function randomString(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;
  }

  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;
    $.ajax({
      type: 'GET',
      url: longpoll,
      cache: false,
      timeout: 60000, // FIXME
      success: handleEvent,
      error: function(XMLHttpRequest, textStatus, errorThrown) {
        Janus.error(textStatus + ": " + errorThrown);
        //~ clearTimeout(timeoutTimer);
        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);
    Janus.debug("Got event on session " + sessionId);
    Janus.debug(json);
    if(!websockets && $.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
      return;
    } else if(json["janus"] === "ack") {
      // Just an ack, we can probably ignore
      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!
      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
      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
      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
      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
      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"] === "error") {
      // Oops, something wrong happened
      Janus.error("Ooops: " + json["error"].code + " " + json["error"].reason); // FIXME
      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") {
      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("Unknown message '" + json["janus"] + "'");
    }
  }

  // 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": 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 = 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 && $.isArray(servers)) {
      // We still need to find a working server from the list we were given
      server = servers[serversIndex];
      if(server.indexOf("ws") === 0) {
        websockets = true;
        Janus.log("Server #" + (serversIndex+1) + ": trying WebSockets to contact Janus (" + server + ")");
      } else {
        websockets = false;
        Janus.log("Server #" + (serversIndex+1) + ": trying REST API to contact Janus (" + server + ")");
      }
    }
    if(websockets) {
      ws = new WebSocket(server, 'janus-protocol');
      wsHandlers = {
        'error': function() {
          Janus.error("Error connecting to the Janus WebSockets server... " + server);
          if ($.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;
    }
    $.ajax({
      type: 'POST',
      url: server,
      cache: false,
      contentType: "application/json",
      data: JSON.stringify(request),
      success: function(json) {
        Janus.debug(json);
        if(json["janus"] !== "success") {
          Janus.error("Ooops: " + json["error"].code + " " + json["error"].reason); // FIXME
          callbacks.error(json["error"].reason);
          return;
        }
        connected = true;
        sessionId = json.data["id"];
        Janus.log("Created session: " + sessionId);
        Janus.sessions[sessionId] = that;
        eventHandler();
        callbacks.success();
      },
      error: function(XMLHttpRequest, textStatus, errorThrown) {
        Janus.error(textStatus + ": " + errorThrown); // FIXME
        if($.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, syncRequest) {
    syncRequest = (syncRequest === true);
    Janus.log("Destroying session " + sessionId + " (sync=" + syncRequest + ")");
    callbacks = callbacks || {};
    // FIXME This method triggers a success even when we fail
    callbacks.success = (typeof callbacks.success == "function") ? callbacks.success : jQuery.noop;
    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, null, syncRequest);
    }
    // Ok, go on
    var request = { "janus": "destroy", "transaction": 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;
    }
    $.ajax({
      type: 'POST',
      url: server + "/" + sessionId,
      async: syncRequest, // Sometimes we need false here, or destroying in onbeforeunload won't work
      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 : jQuery.noop;
    callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : jQuery.noop;
    callbacks.consentDialog = (typeof callbacks.consentDialog == "function") ? callbacks.consentDialog : jQuery.noop;
    callbacks.mediaState = (typeof callbacks.mediaState == "function") ? callbacks.mediaState : jQuery.noop;
    callbacks.webrtcState = (typeof callbacks.webrtcState == "function") ? callbacks.webrtcState : jQuery.noop;
    callbacks.onmessage = (typeof callbacks.onmessage == "function") ? callbacks.onmessage : jQuery.noop;
    callbacks.onlocalstream = (typeof callbacks.onlocalstream == "function") ? callbacks.onlocalstream : jQuery.noop;
    callbacks.onremotestream = (typeof callbacks.onremotestream == "function") ? callbacks.onremotestream : jQuery.noop;
    callbacks.ondata = (typeof callbacks.ondata == "function") ? callbacks.ondata : jQuery.noop;
    callbacks.ondataopen = (typeof callbacks.ondataopen == "function") ? callbacks.ondataopen : jQuery.noop;
    callbacks.oncleanup = (typeof callbacks.oncleanup == "function") ? callbacks.oncleanup : jQuery.noop;
    callbacks.ondetached = (typeof callbacks.ondetached == "function") ? callbacks.ondetached : jQuery.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 transaction = randomString(12);
    var request = { "janus": "attach", "plugin": plugin, "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,
            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;
    }
    $.ajax({
      type: 'POST',
      url: server + "/" + sessionId,
      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,
            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 : jQuery.noop;
    callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : jQuery.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 = 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;
    }
    $.ajax({
      type: 'POST',
      url: server + "/" + sessionId + "/" + handleId,
      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": randomString(12) };
    if(token !== null && token !== undefined)
      request["token"] = token;
    if(apisecret !== null && apisecret !== undefined)
      request["apisecret"] = apisecret;
    Janus.debug("Sending trickle candidate (handle=" + handleId + "):");
    Janus.debug(request);
    if(websockets) {
      request["session_id"] = sessionId;
      request["handle_id"] = handleId;
      ws.send(JSON.stringify(request));
      return;
    }
    $.ajax({
      type: 'POST',
      url: server + "/" + sessionId + "/" + handleId,
      cache: false,
      contentType: "application/json",
      data: JSON.stringify(request),
      success: function(json) {
        Janus.debug("Candidate sent!");
        Janus.debug(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 : jQuery.noop;
    callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : jQuery.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 : jQuery.noop;
    callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : jQuery.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, syncRequest) {
    syncRequest = (syncRequest === true);
    Janus.log("Destroying handle " + handleId + " (sync=" + syncRequest + ")");
    callbacks = callbacks || {};
    callbacks.success = (typeof callbacks.success == "function") ? callbacks.success : jQuery.noop;
    callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : jQuery.noop;
    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": 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;
    }
    $.ajax({
      type: 'POST',
      url: server + "/" + sessionId + "/" + handleId,
      async: syncRequest, // Sometimes we need false here, or destroying in onbeforeunload won't work
      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};
    //~ 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});
    }
    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 ||
          (webrtcDetectedBrowser === '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 {
      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 : jQuery.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 {
        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(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) {
              // 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);
          if(audioSend || videoSend) {
            // 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;
            }
          }

          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 : jQuery.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;
      }
      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 : jQuery.noop;
    callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : jQuery.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(webrtcDetectedBrowser == "firefox" || webrtcDetectedBrowser == "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 : jQuery.noop;
    callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : jQuery.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(webrtcDetectedBrowser == "firefox" || webrtcDetectedBrowser == "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 : jQuery.noop;
    callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : jQuery.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 && webrtcDetectedBrowser == "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 && webrtcDetectedBrowser == "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 && webrtcDetectedBrowser == "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": 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 {
          $.ajax({
            type: 'POST',
            url: server + "/" + sessionId + "/" + handleId,
            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 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(webrtcDetectedBrowser == "edge") {
      Janus.warn("Edge doesn't support compatible video yet");
      return false;
    }
    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 isVideoRecvEnabled(media) {
    Janus.debug("isVideoRecvEnabled:", media);
    if(webrtcDetectedBrowser == "edge") {
      Janus.warn("Edge doesn't support compatible video yet");
      return false;
    }
    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(webrtcDetectedBrowser == "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);
  }
};