made the audioRecorder private to the transcriber

JitsiConference.js

 var GlobalOnErrorHandler = require("./modules/util/GlobalOnErrorHandler");
 var JitsiConferenceEventManager = require("./JitsiConferenceEventManager");
 var Transcriber = require("./modules/transcription/transcriber");
-var AudioRecorder = require("./modules/transcription/audioRecorder");
 
 /**
  * Creates a JitsiConference object with the given name and properties.
     };
     this.isMutedByFocus = false;
     this.reportedAudioSSRCs = {};
-    this.audioRecorder = new AudioRecorder();
 }
 
 /**
  */
 JitsiConference.prototype.getTranscriber = function(){
     if(this.transcriber === undefined){
-        this.transcriber = new Transcriber(this.audioRecorder);
+        this.transcriber = new Transcriber();
     }
     return this.transcriber;
 };

modules/transcription/audioRecorder.js

  * but not removed from the array so that the recorded stream can still be
  * accessed
  *
- * @param jitsiTrack the JitsiTrack to remove from the recording session
+ * @param {JitsiTrack} track the JitsiTrack to remove from the recording session
  */
-audioRecorder.prototype.removeTrack = function(jitsiTrack){
+audioRecorder.prototype.removeTrack = function(track){
+    if(track.isVideoTrack()){
+        return;
+    }
+    
     var array = this.recorders;
     var i;
     for(i = 0; i < array.length; i++) {
-        if(array[i].track.getParticipantId() === jitsiTrack.getParticipantId()){
+        if(array[i].track.getParticipantId() === track.getParticipantId()){
             var recorderToRemove = array[i];
             if(this.isRecording){
                 stopRecorder(recorderToRemove);

modules/transcription/transcriber.js

  * will be merged to create a transcript
  * @param {AudioRecorder} audioRecorder An audioRecorder recording a conference
  */
-var transcriber = function(audioRecorder) {
+var transcriber = function() {
     //the object which can record all audio in the conference
-    this.audioRecorder = audioRecorder;
+    this.audioRecorder = new AudioRecorder();
     //this object can send the recorder audio to a speech-to-text service
     this.transcriptionService =  new SphinxService();
     //holds a counter to keep track if merging can start
 };
 
 /**
- * Returns the AudioRecorder module to add and remove tracks to
+ * Gives the transcriber a JitsiTrack holding an audioStream to transcribe.
+ * The JitsiTrack is given to the audioRecorder. If it doesn't hold an
+ * audiostream, it will not be added by the audioRecorder
+ * @param {JitsiTrack} track the track to give to the audioRecorder
  */
-transcriber.getAudioRecorder = function getAudioRecorder() {
-    return this.audioRecorder;
+transcriber.prototype.addTrack = function(track){
+    this.audioRecorder.addTrack(track);
+};
+
+/**
+ * Remove the given track from the auioRecorder
+ * @param track
+ */
+transcriber.prototype.removeTrack = function(track){
+    this.audioRecorder.removeTrack(track);
 };
 
 /**