// file: csnr_cal_4.cc
//
// this function calculates the energy of the signal
//

// system include file
//
#include <stdio.h>

// local include file
//
#include "global_constants.h"
#include "calculate_snr_constants.h"
#include "calculate_snr.h"

// function: calculate_energy_cc
//
// arguments:
//    float* energy_signal_a: (output) energy of a signal
//    float* signal_window_a: (input) buffer contain the signal to
//                             be pre-emphasized
//    int samples_per_win_a: (input) number of samples per window
//    int num_chans_a: (input) number of channels
//    int debug_mode_a: (input) debug level
//
// return: an int to indicate status
//
// this function calculates the energy of a signal
//
//
int calculate_energy_cc (float*& energy_signal_a, float* signal_window_a,
			 int samples_per_win_a, int num_chans_a,
			 int debug_mode_a) {

  int num_samples = samples_per_win_a * num_chans_a;

  for (int j = 0; j < num_chans_a; j++) {
    energy_signal_a[j] = 0;
    for (int i = j; i < num_samples; i += num_chans_a) {
      energy_signal_a[j] += signal_window_a[i] * signal_window_a[i];
    }
    energy_signal_a[j] /= samples_per_win_a;
  }
  
  // exit gracefully
  //
  return TRUE;
}