SNDST_DSPS_PCHAN
nvlist_add_number(di, SNDST_DSPS_PCHAN, d->playcount);
nvlist_add_number(di, SNDST_DSPS_PCHAN, ud->pchan);
nvlist_exists_number(nvlist, SNDST_DSPS_PCHAN) &&
if (nvlist_get_number(nvlist, SNDST_DSPS_PCHAN) > 0) {
pchan = nvlist_get_number(nvlist, SNDST_DSPS_PCHAN);
nvlist_add_number(di, SNDST_DSPS_PCHAN, UDEV_PCHAN);
pchan = nvlist_get_number(di[i], SNDST_DSPS_PCHAN);
nvlist_add_number(di, SNDST_DSPS_PCHAN, 1);