SNDST_DSPS_INFO_FORMATS
nvlist_add_number(nv, SNDST_DSPS_INFO_FORMATS, formats);
nvlist_exists_number(diinfo, SNDST_DSPS_INFO_FORMATS) &&
*formats = nvlist_get_number(nv, SNDST_DSPS_INFO_FORMATS);
nvlist_add_number(dichild, SNDST_DSPS_INFO_FORMATS, UDEV_FORMATS);
nvlist_add_number(dichild, SNDST_DSPS_INFO_FORMATS, VSUPPORTED_AFMT);