Let the game determine song length.

OpenRA.FileFormats/FileFormats/AudLoader.cs

@@ -102,6 +102,20 @@ namespace OpenRA.FileFormats
 			return output;
 		}
 
+		public static float SoundLength(Stream s)
+		{
+			var br = new BinaryReader(s);
+			var sampleRate = br.ReadUInt16();
+			/*var dataSize = */ br.ReadInt32();
+			var outputSize = br.ReadInt32();
+			var flags = (SoundFlags) br.ReadByte();
+			
+			var samples = outputSize;
+			if (0 != (flags & SoundFlags.Stereo)) samples /= 2;
+			if (0 != (flags & SoundFlags._16Bit)) samples /= 2;
+			return samples / sampleRate;
+		}
+		
 		public static byte[] LoadSound(Stream s)
 		{
 			var br = new BinaryReader(s);

OpenRA.Game/GameRules/MusicInfo.cs

@@ -14,15 +14,21 @@ namespace OpenRA.GameRules
 {
 	public class MusicInfo
 	{
-		[FieldLoader.Load] public readonly string Filename = null;
-		[FieldLoader.Load] public readonly string Title = null;
-		[FieldLoader.Load] public readonly int Length = 0; // seconds
+		public readonly string Filename = null;
+		public readonly string Title = null;
+		public readonly int Length = 0; // seconds
+		public readonly bool Exists = false;
 
 		public MusicInfo( string key, MiniYaml value )
 		{
-			FieldLoader.Load(this, value);
-			if (Filename == null)
-				Filename = key+".aud";
+			Filename = key+".aud";
+			Title = value.Value;
+
+			if (!FileSystem.Exists(Filename))
+				return;
+			
+			Exists = true;
+			Length = (int)AudLoader.SoundLength(FileSystem.Open(Filename));
 		}
 	}
 }

OpenRA.Game/Widgets/Delegates/MusicPlayerDelegate.cs

@@ -86,12 +86,9 @@ namespace OpenRA.Widgets.Delegates
 			var itemTemplate = ml.GetWidget<LabelWidget>("MUSIC_TEMPLATE");
 			int offset = itemTemplate.Bounds.Y;
 			
-			foreach (var kv in Rules.Music)
+			foreach (var kv in Rules.Music.Where(m => m.Value.Exists))
 			{
 				var song = kv.Key;
-				if (!FileSystem.Exists(Rules.Music[song].Filename))
-					continue;
-
 				if (CurrentSong == null)
 					CurrentSong = song;
 

mods/cnc/music.yaml

@@ -1,3 +1 @@
-aoi:
-	Title: Act on Instinct
-	Length: 0
+aoi: Act on Instinct

mods/ra/music.yaml

@@ -1,83 +1,21 @@
-await_r:
-	Title: Afterlife
-	Length: 0
-
-bigf225m:
-	Title: Bigfoot
-	Length: 0
-
-credits:
-	Title: End Credits
-	Length: 0
-
-crus226m:
-	Title: Crush
-	Length: 0
-
-dense_r:
-	Title: Dense
-	Length: 0
-
-fac1225m:
-	Title: Face to the Enemy 1
-	Length: 0
-
-fac2226m:
-	Title: Face to the Enemy 2
-	Length: 0
-
-fogger1a:
-	Title: Fogger
-	Length: 0
-
-hell225m:
-	Title: Hell March
-	Length: 0
-
-mud1a:
-	Title: Mud
-	Length: 0
-
-radio2:
-	Title: Radio 2
-	Length: 0
-
-rollout:
-	Title: Roll Out
-	Length: 0
-
-run1225m:
-	Title: Run for your Life
-	Length: 0
-
-score:
-	Title: Mission Accomplished
-	Length: 0
-
-smsh225m:
-	Title: Smash
-	Length: 0
-
-snake:
-	Title: Snake
-	Length: 0
-
-terminat:
-	Title: Terminate
-	Length: 0
-
-tren226m:
-	Title: Trenches
-	Length: 0
-
-twin:
-	Title: Twin
-	Length: 0
-
-vector1a:
-	Title: Vector
-	Length: 0
-
-work226m:
-	Title: Workmen
-	Length: 0
+await_r: Afterlife
+bigf226m: Bigfoot
+credits: End Credits
+crus226m: Crush
+dense_r: Dense
+fac1226m: Face to the Enemy 1
+fac2226m: Face to the Enemy 2
+fogger1a: Fogger
+hell226m: Hell March
+mud1a: Mud
+radio2: Radio 2
+rollout: Roll Out
+run1226m: Run for your Life
+score: Mission Accomplished
+smsh226m: Smash
+snake: Snake
+terminat: Terminate
+tren226m: Trenches
+twin: Twin
+vector1a: Vector
+work226m: Workmen