static extern uint gst_debug_remove_log_function(GstSharp.LogFunctionNative func);
static extern void gst_debug_add_log_function(GstSharp.LogFunctionNative func, IntPtr user_data, GLib.DestroyNotify notify);
static extern uint gst_debug_remove_log_function(GstSharp.LogFunctionNative func);
static extern void gst_debug_add_log_function(GstSharp.LogFunctionNative func, IntPtr user_data, GLib.DestroyNotify notify);