// file: $SPEECH_HOMEWORK4/hw4/class/snr_ratio/v1.0/snr_cal_3.cc
//

// isip include files
//
#include "signal_noise_ratio.h"
#include "signal_noise_ratio_constants.h"

// method: calculate_energy_cc
//
// arguments:
//  float_4* buffer (input) the data to find energy
//  int_4 sample_per_window (input) the number of samples per window
//  float_4* energy (output) the energy values
//
// return: a logical_1 indicating status
//
logical_1 Signal::calculate_energy_cc (float_4* buffer_a,
				       int_4 samples_per_window_a,
				       int_4 energy_count_a, 
				       float_4* energy_a) {

  // loop over all channels
  //
  for (int_4 channel=0;channel < num_chans_d; channel++) {
    
    energy_a[channel] = 0;
  
    // loop over all samples
    //
    for (int_4 sample=0;sample<samples_per_window_a;sample++) {

      float_4 n = buffer_a[sample * num_chans_d + channel];
      energy_a[channel] += n * n;
      
    }

    // normalize the energy
    //
    energy_a[channel] /= samples_per_window_a;

  }

  if (debug_level_d > 1) {
    for (int_4 i = 0; i < num_chans_d; i++) {
      fprintf(stdout, "energy value [%ld] = %.2f\n", energy_count_a,
	      energy_a[i]);
    }
  }

  // exit gracefully
  //
  return ISIP_TRUE;
  
}