prevent reference cycles between Java and native objects

src/api-impl/android/media/MediaCodec.java

@@ -18,6 +18,7 @@ public class MediaCodec {
 	private long native_codec;
 	private boolean outputFormatSet = false;
 	private MediaFormat mediaFormat;
+	private boolean isReleased = false;
 
 	private Queue<Integer> freeOutputBuffers;
 	private Queue<Integer> queuedInputBuffers;
@@ -148,6 +149,19 @@ public class MediaCodec {
 	public void release() {
 		System.out.println("MediaCodec.release(): codecName=" + codecName);
 		native_release(native_codec);
+		isReleased = true;
+	}
+
+	@Override
+	@SuppressWarnings("deprecation")
+	protected void finalize() throws Throwable {
+		try {
+			super.finalize();
+		} finally {
+			if (!isReleased) {
+				release();
+			}
+		}
 	}
 
 	private native long native_constructor(String codecName);