// file: calculate_snr.h
//
// function prototypes
//

// make sure definitions are only made once
//
#ifndef __CALCULATE_SNR
#define __CALCULATE_SNR

// function definitions
//
extern "C" {

  int calculate_num_samples_cc (float duration, float sample_freq_a);

  int calculate_num_frames_cc (char* input_file_a, int samples_per_frame_a,
			       int num_chans_a);

  int calculate_end_sample_cc (char* input_file_a, float sample_freq_a,
			      int num_chans_a);

  int pre_emphasize_signal_cc (float*& pre_emphasized_signal_a,
			       float* signal_window_a, int samples_per_win_a,
			       int num_chans_a, float*& signal_prev_frame_a,
			       int debug_mode_a);

  int hamming_window_signal_cc (float*& hamming_window_signal_a,
				float* signal_window_a, int samples_per_win_a,
				int num_chans_a, int debug_mode_a);

  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 add_energy_cc (float**& energy_buffer_a, int& num_energy_vals_a,
		     float* energy_window_a, int num_chans_a,
		     int debug_mode_a);

  float calculate_min_cc (float* energy_buffer_a, int num_energy_vals_a);
  float calculate_max_cc (float* energy_buffer_a, int num_energy_vals_a);

  int calculate_hist_cc (float**& bin_midpts_a, int**& bin_freqs_a,
			 float** energy_buffer_a, int num_energy_vals_a,
			 int num_chans_a, int debug_mode_a);
  
  int calculate_pdf_cc (float**& pdf_a, int** bin_freqs_a,
			int num_energy_vals_a, int num_chans_a,
			int debug_mode_a);
  
  int calculate_cdf_cc (float**& cdf_a, float** pdf_a, int num_chans_a,
			int debug_mode_a);

  int calculate_snr_cc (float*& snr_values_a, float** cdf_a,
			float** bin_avgs_a, int num_chans_a,
			float noise_threshold, float signal_threshold,
			int debug_mode_a);
  
  int read_signal_cc (float*& signal_window_a, int num_chans_a,
		      int start_sample_a, int end_sample_a,
		      int end_file_sample_a, char* datafile_a,
		      int debug_mode_a);

  int print_buffer_cc (float* buffer_a, int num_items_a);

  int get_parameters_cc (char* datafile_a, float& frame_size_a,
			 float& window_size_a, float& sample_freq_a,
			 int& num_chans_a, float& noise_threshold_a,
			 float& signal_threshold_a, int& debug_mode_a,
			 char** argv_a, int argc_a);
  
  int check_parameters_cc (char* datafile_a, float frame_size_a,
			   float window_size_a, float sample_freq_a,
			   int num_chans_a, float noise_threshold_a,
			   float signal_threshold_a, int debug_mode_a);

}


// end of file
//
#endif