sndbuf_getbuf
r = emu_memfree(sc, sndbuf_getbuf(ch->buffer));
dma_free(ess->buf_dmat, sndbuf_getbuf(ch->buffer), ch->map);
"play" : "rec", sndbuf_getbuf(ch->buffer));
p = sndbuf_getbuf(b);
memset(sndbuf_getbuf(b), sndbuf_zerodata(b->fmt), b->bufsize);
memset(sndbuf_getbuf(b), sndbuf_zerodata(b->fmt), b->bufsize);
void *sndbuf_getbuf(struct snd_dbuf *b);
tmp = sndbuf_getbuf(src);