internal static extern void nim_vchat_set_video_data_cb(bool capture, [MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef = typeof(NimUtility.Utf8StringMarshaler))] string json_extension, nim_vchat_video_data_cb_func cb, IntPtr user_data);
public static extern void nim_vchat_set_video_data_cb(bool capture, nim_vchat_video_data_cb_func cb, IntPtr user_data);