webapprt/WebRTCHandler.jsm

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   3  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 "use strict";
   6
   7 this.EXPORTED_SYMBOLS = [];
   8
   9 let Cc = Components.classes;
  10 let Ci = Components.interfaces;
  11 let Cu = Components.utils;
  12
  13 Cu.import("resource://gre/modules/Services.jsm");
  14 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
  15
  16 function handleRequest(aSubject, aTopic, aData) {
  17   let { windowID, callID } = aSubject;
  18   let constraints = aSubject.getConstraints();
  19   let contentWindow = Services.wm.getOuterWindowWithId(windowID);
  20
  21   contentWindow.navigator.mozGetUserMediaDevices(
  22     constraints,
  23     function (devices) {
  24       prompt(contentWindow, callID, constraints.audio,
  25              constraints.video || constraints.picture,
  26              devices);
  27     },
  28     function (error) {
  29       denyRequest(callID, error);
  30     });
  31 }
  32
  33 function prompt(aWindow, aCallID, aAudioRequested, aVideoRequested, aDevices) {
  34   let audioDevices = [];
  35   let videoDevices = [];
  36   for (let device of aDevices) {
  37     device = device.QueryInterface(Ci.nsIMediaDevice);
  38     switch (device.type) {
  39       case "audio":
  40         if (aAudioRequested) {
  41           audioDevices.push(device);
  42         }
  43         break;
  44
  45       case "video":
  46         if (aVideoRequested) {
  47           videoDevices.push(device);
  48         }
  49         break;
  50     }
  51   }
  52
  53   if (audioDevices.length == 0 && videoDevices.length == 0) {
  54     denyRequest(aCallID);
  55     return;
  56   }
  57
  58   let params = {
  59                  videoDevices: videoDevices,
  60                  audioDevices: audioDevices,
  61                  out: null
  62                };
  63   aWindow.openDialog("chrome://webapprt/content/getUserMediaDialog.xul", "",
  64                      "chrome, dialog, modal", params).focus();
  65
  66   if (!params.out) {
  67     denyRequest(aCallID);
  68     return;
  69   }
  70
  71   let allowedDevices = Cc["@mozilla.org/supports-array;1"].
  72                        createInstance(Ci.nsISupportsArray);
  73   let videoIndex = params.out.video;
  74   let audioIndex = params.out.audio;
  75
  76   if (videoIndex != -1) {
  77     allowedDevices.AppendElement(videoDevices[videoIndex]);
  78   }
  79
  80   if (audioIndex != -1) {
  81     allowedDevices.AppendElement(audioDevices[audioIndex]);
  82   }
  83
  84   if (allowedDevices.Count()) {
  85     Services.obs.notifyObservers(allowedDevices, "getUserMedia:response:allow",
  86                                  aCallID);
  87   } else {
  88     denyRequest(aCallID);
  89   }
  90 }
  91
  92 function denyRequest(aCallID, aError) {
  93   let msg = null;
  94   if (aError) {
  95     msg = Cc["@mozilla.org/supports-string;1"].
  96           createInstance(Ci.nsISupportsString);
  97     msg.data = aError;
  98   }
  99
 100   Services.obs.notifyObservers(msg, "getUserMedia:response:deny", aCallID);
 101 }
 102
 103 Services.obs.addObserver(handleRequest, "getUserMedia:request", false);