sndbuf_gettotal
u_int64_t sndbuf_gettotal(struct snd_dbuf *b);
delta = sndbuf_gettotal(bs) - sndbuf_getprevtotal(bs);
a->bytes = sndbuf_gettotal(bs);
a->bytes = sndbuf_gettotal(bs);
oc->samples = (sndbuf_gettotal(b) + tmp) / sndbuf_getalign(b);
oc->samples = sndbuf_gettotal(bs) / sndbuf_getalign(bs);