Store outputs that have been added in gstreamer class

mopidy/gstreamer.py

@@ -40,6 +40,7 @@ class GStreamer(ThreadingActor):
         self._tee = None
         self._uridecodebin = None
         self._volume = None
+        self._outputs = {}
 
     def on_start(self):
         self._setup_gstreamer()
@@ -274,3 +275,8 @@ class GStreamer(ThreadingActor):
         self._pipeline.add(output)
         output.sync_state_with_parent() # Required to add to running pipe
         gst.element_link_many(self._tee, output)
+
+        self._outputs[output.get_name()] = output
+
+    def list_outputs(self):
+        return self._outputs.keys()

mopidy/outputs/__init__.py

@@ -17,6 +17,7 @@ class BaseOutput(object):
         logger.debug('Creating new output: %s', description)
 
         output = gst.parse_bin_from_description(description, True)
+        output.set_name(self.__class__.__name__)
         self.modify_bin(output)
 
         return output