+ * @brief Add a output mode change handler
+ * @param[in] output A output object
+ * @param[in] func A output mode change handler
+ * @param[in] user_data The user data
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ */
+tdm_error
+tdm_output_add_mode_change_request_handler(tdm_output *output,
+ tdm_output_mode_change_request_handler func,
+ void *user_data);
+
+/**
+ * @brief Remove a output mode change handler
+ * @param[in] output A output object
+ * @param[in] func A output mode change handler
+ * @param[in] user_data The user data
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ */
+tdm_error
+tdm_output_remove_mode_change_request_handler(tdm_output *output,
+ tdm_output_mode_change_request_handler func,
+ void *user_data);
+
+/**