src_set_sf
int (*src_set_sf)(void *blk, unsigned int sf);
.src_set_sf = src_set_sf,
.src_set_sf = src_set_sf,
hw->src_set_sf(src->rsc.ctrl_blk, SRC_SF_S16);
hw->src_set_sf(src->rsc.ctrl_blk, SRC_SF_S16);
hw->src_set_sf(src->rsc.ctrl_blk, SRC_SF_F32);
.set_sf = src_set_sf,
hw->src_set_sf(src->rsc.ctrl_blk, sf);