HDSP_CHANBUF_SAMPLES
dma[slot * HDSP_CHANBUF_SAMPLES + pos] =
dma += slot_offset * HDSP_CHANBUF_SAMPLES;
dma[slot * HDSP_CHANBUF_SAMPLES + pos];
dma += slot_offset * HDSP_CHANBUF_SAMPLES;
bzero(buf + offset * HDSP_CHANBUF_SAMPLES, HDSP_CHANBUF_SIZE);
#define HDSP_CHANBUF_SIZE (4 * HDSP_CHANBUF_SAMPLES)