Don't constantly refresh the cd device if it doesn't support checking for media changes.

Filter out irrelevant devices on OS X.

src/devices/cddadevice.cpp

@@ -119,7 +119,7 @@ void CddaDevice::Init() {
     musicbrainz_client->StartDiscIdRequest(musicbrainz_discid);
     g_free(string_mb);
   }
-  
+
   // Clean all the Gstreamer objects we have used: we don't need them anymore
   gst_element_set_state (pipe, GST_STATE_NULL);
   gst_object_unref(GST_OBJECT(pipe));
@@ -154,8 +154,8 @@ void CddaDevice::AudioCDTagsLoaded(const QString& artist, const QString& album,
 }
 
 void CddaDevice::Refresh() {
-  if ((cdio_ && cdda_) &&             /* already init... */
-      !cdio_get_media_changed(cdio_) /* ...and hasn't change since last time */) {
+  if ((cdio_ && cdda_) &&                /* already init... */
+      cdio_get_media_changed(cdio_) != 1 /* ...and hasn't change since last time */) {
     return;
   }
   // Check if mutex is already token (i.e. init is already taking place)

src/devices/cddalister.cpp

@@ -106,7 +106,15 @@ void CddaLister::Init() {
   for (; *devices != NULL; ++devices) {
     if (strcmp("/dev/cdrom", *devices) == 0)
       continue;
+
     QString device(*devices);
+#ifdef Q_OS_DARWIN
+    // Every track is detected as a separate device on Darwin. The raw disk looks
+    // like /dev/rdisk1
+    if (!device.contains(QRegExp("^/dev/rdisk[0-9]$"))) {
+      continue;
+    }
+#endif
     devices_list_ << device;
     emit DeviceAdded(device);
   }