static void OverrideStreamNotify(GLib.GType gtype, StreamNotifyNativeDelegate callback)
 {
     unsafe {
         IntPtr *raw_ptr = (IntPtr *)(((long)gtype.GetClassPtr()) + (long)class_abi.GetFieldOffset("stream_notify"));
         *raw_ptr = Marshal.GetFunctionPointerForDelegate((Delegate)callback);
     }
 }
        private void InternalStreamNotify(Gst.Stream _object, IntPtr p0)
        {
            StreamNotifyNativeDelegate unmanaged = null;

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

            unmanaged(this.Handle, _object == null ? IntPtr.Zero : _object.Handle, p0);
        }