Calling a Java function from C#: how can I pass a byte[] by reference into the Java function or return a byte[] by reference from the Java function?

Dear All,

I work on a project that capturing video images and passing images back to unity. Capturing functions are written in Java where I prepare image data in byte[].

I use

AndroidJavaClass.CallStatic("GetImageBuffer"); AndroidJavaClass.CallStatic("FillImageBuffer",buf);

I found that the behavior of CallStatic is "call by value" and "return by value". In my case, the speed of "by value" is very slow. How can it works through "call by reference" or "return by reference"? Thank you very much!