sndbuf_getfreeptr
dst = sndbuf_getfreeptr(ch->buffer) / 4;
dst = sndbuf_getfreeptr(ch->buffer) / 2;
dst = sndbuf_getfreeptr(ch->buffer) / 4;
dst = sndbuf_getfreeptr(ch->buffer) / 2;
src = sndbuf_getfreeptr(ch->buffer);
i = sndbuf_getfreeptr(b);
l = min(count, sndbuf_getsize(b) - sndbuf_getfreeptr(b));
bcopy(from, sndbuf_getbufofs(b, sndbuf_getfreeptr(b)), l);
unsigned int sndbuf_getfreeptr(struct snd_dbuf *b);
p = sndbuf_getfreeptr(bs);
a->ptr = sndbuf_getfreeptr(bs);