typedef struct bt_self_component_sink bt_self_component_sink;
typedef struct bt_self_component_source bt_self_component_source;
typedef struct bt_self_message_iterator bt_self_message_iterator;
typedef struct bt_self_component_sink bt_self_component_sink;
typedef struct bt_self_component_source bt_self_component_source;
typedef struct bt_self_message_iterator bt_self_message_iterator;