audio_return_t audio_set_volume_mute(void *audio_handle, audio_volume_info_t *info, uint32_t mute);
/**
+ * @brief Sets the volume ratio specified for a particular volume information. (optional)
+ * @since_tizen 5.5
+ * @param[in] audio_handle The audio hal handle
+ * @param[in] info The audio volume information
+ * @param[in] ratio The volume ratio to be set (Min.:0.0 ~ Max.:1.0, default:1.0)
+ *
+ * @return @c 0 on success,
+ * otherwise a negative error value
+ * @retval #AUDIO_RET_OK Success
+ */
+audio_return_t audio_set_volume_ratio(void *audio_handle, audio_stream_info_t *info, double ratio);
+
+/**
* @brief Gets notified when a ducking is activated and deactivated.
* @since_tizen 5.5
* @param[in] audio_handle The audio hal handle