diff --git a/common/lib/src/playback.dart b/common/lib/src/playback.dart
index 6de8a16..ac81eaa 100644
--- a/common/lib/src/playback.dart
+++ b/common/lib/src/playback.dart
@@ -45,7 +45,7 @@ abstract class MusicusPlayback {
   final normalizedPosition = BehaviorSubject.seeded(0.0);
 
   /// Initialize the player.
-  /// 
+  ///
   /// This will be called after the database was initialized.
   Future<void> setup();
 
@@ -93,4 +93,38 @@ abstract class MusicusPlayback {
     duration.close();
     normalizedPosition.close();
   }
-}
\ No newline at end of file
+
+  /// Update [position] and [normalizedPosition].
+  ///
+  /// Requires [duration] to be up to date
+  void updatePosition(int positionMs) {
+    position.add(Duration(milliseconds: positionMs));
+    _setNormalizedPosition(positionMs / duration.value.inMilliseconds);
+  }
+
+  /// Update [position], [duration] and [normalizedPosition].
+  void updateDuration(int positionMs, int durationMs) {
+    position.add(Duration(milliseconds: positionMs));
+    duration.add(Duration(milliseconds: durationMs));
+    _setNormalizedPosition(positionMs / durationMs);
+  }
+
+  /// Update [normalizedPosition] ensuring its value is between 0.0 and 1.0.
+  void _setNormalizedPosition(double value) {
+    if (value <= 0.0) {
+      normalizedPosition.add(0.0);
+    } else if (value >= 1.0) {
+      normalizedPosition.add(1.0);
+    } else {
+      normalizedPosition.add(value);
+    }
+  }
+
+  /// Update [currentIndex] and [currentTrack].
+  ///
+  /// Requires [playlist] to be up to date.
+  void updateCurrentTrack(int index) {
+    currentIndex.add(index);
+    currentTrack.add(playlist.value[index]);
+  }
+}
diff --git a/mobile/lib/playback.dart b/mobile/lib/playback.dart
index 51fec66..0b72720 100644
--- a/mobile/lib/playback.dart
+++ b/mobile/lib/playback.dart
@@ -34,40 +34,6 @@ class Playback extends MusicusPlayback {
     }
   }
 
-  /// Update [position] and [normalizedPosition].
-  ///
-  /// Requires [duration] to be up to date
-  void _updatePosition(int positionMs) {
-    position.add(Duration(milliseconds: positionMs));
-    _setNormalizedPosition(positionMs / duration.value.inMilliseconds);
-  }
-
-  /// Update [position], [duration] and [normalizedPosition].
-  void _updateDuration(int positionMs, int durationMs) {
-    position.add(Duration(milliseconds: positionMs));
-    duration.add(Duration(milliseconds: durationMs));
-    _setNormalizedPosition(positionMs / durationMs);
-  }
-
-  /// Update [normalizedPosition] ensuring its value is between 0.0 and 1.0.
-  void _setNormalizedPosition(double value) {
-    if (value <= 0.0) {
-      normalizedPosition.add(0.0);
-    } else if (value >= 1.0) {
-      normalizedPosition.add(1.0);
-    } else {
-      normalizedPosition.add(value);
-    }
-  }
-
-  /// Update [currentIndex] and [currentTrack].
-  ///
-  /// Requires [playlist] to be up to date.
-  void _updateCurrentTrack(int index) {
-    currentIndex.add(index);
-    currentTrack.add(playlist.value[index]);
-  }
-
   @override
   Future<void> setup() async {
     if (_playbackServiceStateSubscription != null) {
@@ -93,14 +59,14 @@ class Playback extends MusicusPlayback {
         if (msg is _StatusMessage) {
           playing.add(msg.playing);
         } else if (msg is _PositionMessage) {
-          _updatePosition(msg.positionMs);
+          updatePosition(msg.positionMs);
         } else if (msg is _TrackMessage) {
-          _updateCurrentTrack(msg.currentTrack);
-          _updateDuration(msg.positionMs, msg.durationMs);
+          updateCurrentTrack(msg.currentTrack);
+          updateDuration(msg.positionMs, msg.durationMs);
         } else if (msg is _PlaylistMessage) {
           playlist.add(msg.playlist);
-          _updateCurrentTrack(msg.currentTrack);
-          _updateDuration(msg.positionMs, msg.durationMs);
+          updateCurrentTrack(msg.currentTrack);
+          updateDuration(msg.positionMs, msg.durationMs);
         }
       }
     });