// file: csnr_cal_1.cc
//
// this function calculates the number of frames in a file
//

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

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

// function: calculate_num_frames_cc
//
// arguments:
//    char* input_file_a: (input) name of input file
//    int samples_per_frame_a: (input) number of samples per frame
//    int num_chans_a: (input) number of channels
//
// return: the number of frames in this file
//
// this function calculates the number of frames in a file
//
//
int calculate_num_frames_cc (char* input_file_a, int samples_per_frame_a,
			     int num_chans_a) {

  // open the file
  //
  FILE* fp = fopen (input_file_a, "r");

  // check for NULL file pointer
  //
  if (fp == (FILE*)NULL) {
    return FALSE;
  }
  
  // rewind the file to the beginning of the file
  //
  rewind(fp);

  // compute the length of file in bytes
  //
  fseek(fp, 0, SEEK_END);
  int end = ftell(fp);

  // return number of frames in the file
  //
  return (int ( rint (end / (samples_per_frame_a * num_chans_a *
			     CSNR_BYTES_PER_SAMPLE) ) + 1));
}