audio: Move PlaybackState from core to audio so audio can use it

mopidy/audio/__init__.py

@@ -3,3 +3,4 @@ from __future__ import unicode_literals
 # flake8: noqa
 from .actor import Audio
 from .listener import AudioListener
+from .constants import PlaybackState

mopidy/audio/constants.py

@@ -0,0 +1,16 @@
+from __future__ import unicode_literals
+
+
+class PlaybackState(object):
+    """
+    Enum of playback states.
+    """
+
+    #: Constant representing the paused state.
+    PAUSED = 'paused'
+
+    #: Constant representing the playing state.
+    PLAYING = 'playing'
+
+    #: Constant representing the stopped state.
+    STOPPED = 'stopped'

mopidy/core/playback.py

@@ -4,6 +4,8 @@ import logging
 import random
 import urlparse
 
+from mopidy.audio import PlaybackState
+
 from . import listener
 
 
@@ -24,21 +26,6 @@ def option_wrapper(name, default):
     return property(get_option, set_option)
 
 
-class PlaybackState(object):
-    """
-    Enum of playback states.
-    """
-
-    #: Constant representing the paused state.
-    PAUSED = 'paused'
-
-    #: Constant representing the playing state.
-    PLAYING = 'playing'
-
-    #: Constant representing the stopped state.
-    STOPPED = 'stopped'
-
-
 class PlaybackController(object):
     # pylint: disable = R0902
     # Too many instance attributes