/* See {dsm_comman.h}  */

#define _GNU_SOURCE
#include <stdint.h>
#include <assert.h>

#include <dsm_common.h>

uint8_t *grab_past_buffer(dsm_common_data_t *cd, int index) {
  assert((index >= 0) && (index < NUM_OF_BUFFERED_FRAMES));
  int ibuf = (index + cd->icurr) % NUM_OF_BUFFERED_FRAMES;
  return cd->framebuf[ibuf];
}