// file: $SPEECH_HOMEWORK4/hw4/class/snr_ratio/v1.0/snr_cdf_0.cc
//

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

// method: calculate_cdf_cc
//
// arguments:
//  int_4** pdf (input) the pdf values
//  int_4** cdf (output) the output location of the cdf values
//
// return: a logical_1 indicating status
//
logical_1 Signal::calculate_cdf_cc (int_4** pdf_a, int_4** cdf_a) {

  // check argument
  //
  if (cdf_a == (int_4**)NULL) {
    error_handler_cc((char_1*)"calculate_cdf_cc",
		     (char_1*)"output memory is not allocated");
  }

  // loop over channels
  //
  for (int_4 channel=0;channel<num_chans_d;channel++) {

    // preset the first bin's value
    //
    cdf_a[0][channel] = pdf_a[0][channel];

    for (int_4 bin=1;bin<num_bins_d;bin++) {

      // cumulate the pdf to get cdf
      //
      cdf_a[bin][channel] = cdf_a[bin-1][channel] +
	pdf_a[bin][channel];
    }
  }
  
  // exit gracefully
  //
  return ISIP_TRUE;
}