Revert "Arrays retrieved from memory pool class are of fixed size now…

…. Dynamic size was error prone and hurt performance."

This reverts commit dfee309132775543cec5d2b8cf4109ee7261da5e.

Reverted, because it breaks existing code (not production code, but still...).

common/src/core/Utils/Streams/MemoryPool.cs

@@ -7,28 +7,41 @@ namespace VVVV.Utils.Streams
     [ComVisible(false)]
 	public static class MemoryPool<T>
 	{
-		private static readonly Stack<T[]> FStack = new Stack<T[]>();
+		private static readonly Dictionary<int, Stack<T[]>> FPool = new Dictionary<int, Stack<T[]>>();
 
-		public static T[] GetArray()
+		public static T[] GetArray(int length = StreamUtils.BUFFER_SIZE)
 		{
-			lock (FStack)
+			lock (FPool)
 			{
-				if (FStack.Count == 0)
+				Stack<T[]> stack = null;
+				if (!FPool.TryGetValue(length, out stack))
 				{
-					return new T[StreamUtils.BUFFER_SIZE];
+					stack = new Stack<T[]>();
+					FPool[length] = stack;
+				}
+
+				if (stack.Count == 0)
+				{
+					return new T[length];
 				}
 				else
 				{
-					return FStack.Pop();
+					return stack.Pop();
 				}
 			}
 		}
 
 		public static void PutArray(T[] array)
 		{
-			lock (FStack)
+			lock (FPool)
 			{
-				FStack.Push(array);
+				Stack<T[]> stack = null;
+				if (!FPool.TryGetValue(array.Length, out stack))
+				{
+					stack = new Stack<T[]>();
+					FPool[array.Length] = stack;
+				}
+				stack.Push(array);
 			}
 		}
 	}