/**
+ * @brief Definition of audio ID that means audio source from bluetooth.
+ * @since_tizen 5.5
+ */
+#define STTE_AUDIO_ID_BLUETOOTH "STT_AUDIO_ID_BLUETOOTH"
+
+
+/**
+ * @brief Definition of audio ID that means audio source from wifi.
+ * @since_tizen 5.5
+ */
+#define STTE_AUDIO_ID_WIFI "STT_AUDIO_ID_WIFI"
+
+
+/**
* @brief Called when STT engine provides the time stamp of result to the engine service user.
* @details This callback function is implemented by the engine service user. Therefore, the engine developer does NOT have to implement this callback function.
* @since_tizen 3.0
/**
+ * @brief Called when the engine service user sets audio recording type.
+ * @since_tizen 5.5
+ * @remarks The @a audio_type can be used only in the callback. To use outside, make a copy.
+ * @param[in] audio_type Current audio type (e.g. #STTE_AUDIO_ID_BLUETOOTH or #STTE_AUDIO_ID_WIFI)
+ * @param[in] user_data user_data The user data to be passed to the callback function
+ * @return 0 on success, otherwise a negative error value.
+ * @retval #VCE_ERROR_NONE Successful.
+ * @retval #STTE_ERROR_INVALID_PARAMETER Invalid parameter
+ * @retval #STTE_ERROR_OPERATION_FAILED Operation failure
+ */
+typedef int (*stte_audio_type_cb)(const char* audio_type, void* user_data);
+
+
+/**
* @brief A structure for the STT engine functions.
* @details This structure contains essential callback functions for operating STT engine.
* @since_tizen 3.0
int stte_set_private_data_requested_cb(stte_private_data_requested_cb callback_func);
+/**
+* @brief Sets a callback function for setting the audio type.
+* @since_tizen 5.5
+* @remarks The stte_audio_type_cb() function is called when STT framework sets audio type to the STT engine.
+* @param[in] callback_func stte_audio_type_set event callback function
+* @param[in] user_data The user data passed to the callback function
+* @return @c 0 on success,
+* otherwise a negative error value
+* @retval #STTE_ERROR_NONE Successful
+* @retval #STTE_ERROR_INVALID_PARAMETER Invalid parameter
+* @retval #STTE_ERROR_NOT_SUPPORTED Not supported
+* @retval #STTE_ERROR_OPERATION_FAILED Operation failure
+* @pre The stte_main() function should be invoked before this function is called.
+* @see stte_audio_type_cb()
+* @see stte_unset_audio_type_set_cb()
+*/
+int stte_set_audio_type_set_cb(stte_audio_type_cb callback_func, void* user_data);
+
+
+/**
+* @brief Unsets a callback function for setting the audio type.
+* @since_tizen 5.5
+* @return @c 0 on success,
+* otherwise a negative error value
+* @retval #STTE_ERROR_NONE Successful
+* @retval #STTE_ERROR_NOT_SUPPORTED Not supported
+* @retval #STTE_ERROR_OPERATION_FAILED Operation failure
+* @pre The stte_main() function should be invoked before this function is called.
+* @see stte_set_audio_type_set_cb()
+*/
+int stte_unset_audio_type_set_cb(void);
+
+
#ifdef __cplusplus
}
#endif