Add double-free detection code to the pools

src/com/limelight/nvstream/av/AvShortBufferPool.java

@@ -6,6 +6,8 @@ public class AvShortBufferPool {
 	private ConcurrentLinkedQueue<short[]> bufferList = new ConcurrentLinkedQueue<short[]>();
 	private int bufferSize;
 	
+	private static final boolean doubleFreeDebug = true;
+	
 	public AvShortBufferPool(int size)
 	{
 		this.bufferSize = size;
@@ -18,7 +20,13 @@ public class AvShortBufferPool {
 	
 	public short[] allocate()
 	{
-		short[] buff = bufferList.poll();
+		short[] buff;
+		if (doubleFreeDebug) {
+			buff = null;
+		}
+		else {
+			buff = bufferList.poll();
+		}
 		if (buff == null) {
 			buff = new short[bufferSize];
 		}
@@ -27,6 +35,14 @@ public class AvShortBufferPool {
 	
 	public void free(short[] buffer)
 	{
+		if (doubleFreeDebug) {
+			for (short[] buf : bufferList) {
+				if (buf == buffer) {
+					throw new IllegalStateException("Double free detected");
+				}
+			}
+		}
+		
 		bufferList.add(buffer);
 	}
 }