int _bt_avrcp_set_track_info(media_metadata_attributes_t *meta_data);
+int _bt_avrcp_target_notify_volume(bluetooth_device_address_t *address, unsigned int volume);
+
+int _bt_avrcp_target_get_volume(bluetooth_device_address_t *address, unsigned int *volume);
+
int _bt_avrcp_set_properties(media_player_settings_t *properties);
int _bt_avrcp_set_property(int type, unsigned int value);