static void OverrideCleanFrame(GLib.GType gtype, CleanFrameNativeDelegate callback)
 {
     unsafe {
         IntPtr *raw_ptr = (IntPtr *)(((long)gtype.GetClassPtr()) + (long)class_abi.GetFieldOffset("clean_frame"));
         *raw_ptr = Marshal.GetFunctionPointerForDelegate((Delegate)callback);
     }
 }
        private void InternalCleanFrame(Gst.Video.VideoAggregator videoaggregator, Gst.Video.VideoFrame prepared_frame)
        {
            CleanFrameNativeDelegate unmanaged = null;

            unsafe {
                IntPtr *raw_ptr = (IntPtr *)(((long)this.LookupGType().GetThresholdType().GetClassPtr()) + (long)class_abi.GetFieldOffset("clean_frame"));
                unmanaged = (CleanFrameNativeDelegate)Marshal.GetDelegateForFunctionPointer(*raw_ptr, typeof(CleanFrameNativeDelegate));
            }
            if (unmanaged == null)
            {
                return;
            }

            IntPtr native_prepared_frame = GLib.Marshaller.StructureToPtrAlloc(prepared_frame);

            unmanaged(this.Handle, videoaggregator == null ? IntPtr.Zero : videoaggregator.Handle, native_prepared_frame);
            Marshal.FreeHGlobal(native_prepared_frame);
        }