root/lang/cplusplus/dokodemo_yubipiano/filter.cc

/*
 *  filter
 *  PlaySoftMIDI
 */
#include "filter.h"

MovingAverageFilter::MovingAverageFilter(int taps) :
  values_(taps, 0)
{
}
  
int MovingAverageFilter::filter(int sample) {
  int acm(0);
  int taps(values_.size());

  values_[0] = sample;

  for (int i(0); i<taps; i++) {
    acm += values_[i];
  }

  for (int i=taps-1; i>0; i--) {
    values_[i] = values_[i-1];
  }

  return acm / taps;
}