HDSPE_CHANBUF_SIZE
bzero(buf + HDSPE_CHANBUF_SAMPLES * ch->lslot, HDSPE_CHANBUF_SIZE);
bzero(buf + HDSPE_CHANBUF_SAMPLES * ch->rslot, HDSPE_CHANBUF_SIZE);
ch->size = HDSPE_CHANBUF_SIZE * 2 /* slots */;
sndbuf_resize(ch->buffer, (HDSPE_CHANBUF_SIZE * 2) / (sc->period * 4),
#define HDSPE_DMASEGSIZE (HDSPE_CHANBUF_SIZE * HDSPE_MAX_SLOTS)