/* audio bridging */
struct port_bridge *p_bridge; /* linked to a port bridge or NULL */
void bridge(unsigned int bridge_id); /* join a bridge */
+ class Port *bridge_remote(void); /* get remote port */
int bridge_tx(unsigned char *data, int len); /* used to transmit data to remote port */
virtual int bridge_rx(unsigned char *data, int len); /* function to be inherited, so data is received */