Update in-line with framework

osu-framework

@@ -1 +1 @@
-Subproject commit 4019939ba9f0a407880e00422280ba573ffddb24
+Subproject commit 38cf96c8994ad41ae6aa86de6bfe09fd5fa9e1b6

osu.Game/Beatmaps/BeatmapManager.cs

@@ -573,6 +573,16 @@ protected override Track GetTrack()
                 }
                 catch { return new TrackVirtual(); }
             }
+
+            protected override Waveform GetWaveform()
+            {
+                try
+                {
+                    var trackData = store.GetStream(getPathForFile(Metadata.AudioFile));
+                    return trackData == null ? new Waveform() : new Waveform(trackData);
+                }
+                catch { return new Waveform(); }
+            }
         }
 
         /// <summary>

osu.Game/Beatmaps/WorkingBeatmap.cs

@@ -43,6 +43,7 @@ private void applyRateAdjustments()
         protected abstract Beatmap GetBeatmap();
         protected abstract Texture GetBackground();
         protected abstract Track GetTrack();
+        protected virtual Waveform GetWaveform() => new Waveform();
 
         private Beatmap beatmap;
         private readonly object beatmapLock = new object();
@@ -96,6 +97,17 @@ public Track Track
             }
         }
 
+        private Waveform waveform;
+        private readonly object waveformLock = new object();
+        public Waveform Waveform
+        {
+            get
+            {
+                lock (waveformLock)
+                    return waveform ?? (waveform = GetWaveform());
+            }
+        }
+
         public bool TrackLoaded => track != null;
 
         public void TransferTo(WorkingBeatmap other)
@@ -114,6 +126,8 @@ public virtual void Dispose()
         {
             background?.Dispose();
             background = null;
+
+            waveform?.Dispose();
         }
 
         public void DisposeTrack()

osu.Game/Screens/Edit/Screens/Compose/BeatmapWaveformGraph.cs

@@ -18,7 +18,7 @@ public class BeatmapWaveformGraph : CompositeDrawable
         public BeatmapWaveformGraph()
         {
             InternalChild = graph = new WaveformGraph { RelativeSizeAxes = Axes.Both };
-            Beatmap.ValueChanged += b => graph.Track = b.Track;
+            Beatmap.ValueChanged += b => graph.Waveform = b.Waveform;
         }
 
         /// <summary>