static void OverridePushBufferListEvent(GLib.GType gtype, PushBufferListEventNativeDelegate callback)
 {
     unsafe {
         IntPtr *raw_ptr = (IntPtr *)(((long)gtype.GetClassPtr()) + (long)class_abi.GetFieldOffset("push_buffer_list"));
         *raw_ptr = Marshal.GetFunctionPointerForDelegate((Delegate)callback);
     }
 }
        private Gst.FlowReturn InternalPushBufferListEvent(Gst.BufferList buffer_list)
        {
            PushBufferListEventNativeDelegate unmanaged = null;

            unsafe {
                IntPtr *raw_ptr = (IntPtr *)(((long)this.LookupGType().GetThresholdType().GetClassPtr()) + (long)class_abi.GetFieldOffset("push_buffer_list"));
                unmanaged = (PushBufferListEventNativeDelegate)Marshal.GetDelegateForFunctionPointer(*raw_ptr, typeof(PushBufferListEventNativeDelegate));
            }
            if (unmanaged == null)
            {
                return((Gst.FlowReturn) 0);
            }

            int __result = unmanaged(this.Handle, buffer_list == null ? IntPtr.Zero : buffer_list.Handle);

            return((Gst.FlowReturn)__result);
        }