mpris: Add discNumber support

docs/changes.rst

@@ -24,6 +24,8 @@ v0.13.0 (in development)
 
 - Publish album art URIs if available.
 
+- Publish disc number of track if available.
+
 
 v0.12.0 (2013-03-12)
 ====================

mopidy/frontends/mpris/objects.py

@@ -379,6 +379,8 @@ class MprisObject(dbus.service.Object):
                 url = list(track.album.images)[0]
                 if url:
                     metadata['mpris:artUrl'] = url
+            if track.disc_no:
+                metadata['xesam:discNumber'] = track.disc_no
             if track.track_no:
                 metadata['xesam:trackNumber'] = track.track_no
             return dbus.Dictionary(metadata, signature='sv')

tests/frontends/mpris/player_interface_test.py

@@ -224,6 +224,13 @@ class PlayerInterfaceTest(unittest.TestCase):
         result = self.mpris.Get(objects.PLAYER_IFACE, 'Metadata')
         self.assertNotIn('mpris:artUrl', result.keys())
 
+    def test_get_metadata_has_disc_number_in_album(self):
+        self.core.tracklist.add([Track(disc_no=2)])
+        self.core.playback.play()
+        result = self.mpris.Get(objects.PLAYER_IFACE, 'Metadata')
+        self.assertIn('xesam:discNumber', result.keys())
+        self.assertEqual(result['xesam:discNumber'], 2)
+
     def test_get_metadata_has_track_number_in_album(self):
         self.core.tracklist.add([Track(track_no=7)])
         self.core.playback.play()