au_get_port
static int au_get_port(struct audio_softc *, struct au_mixer_ports *);
oldpi->port = au_get_port(sc, &sc->sc_outports);
oldri->port = au_get_port(sc, &sc->sc_inports);
pi->port = au_get_port(sc, &sc->sc_outports);
ri->port = au_get_port(sc, &sc->sc_inports);