// This is an example of reading in a .bbr file generated by a sweep recording in Spike

// The general file structure of a .bbr file is below.

// *Begin*
// Header x1
// Sweep Time (sweep 1)
// Sweep Min Array (sweep 1)
// Sweep Max Array (sweep 1)
// Sweep Time (sweep 2)
// Sweep Min Array (sweep 2)
// Sweep Max Array (sweep 2)
// ... ( more sweeps )
// *End*

#pragma warning(disable: 4996)

#include <stdio.h>
#include <stdlib.h>

typedef struct BBRHeader {
    unsigned short signature;
    unsigned short version;

    int sweep_count; // Number of sweeps in file

    unsigned short title[128];
	// Sweep configuration set by user during the time of sweep capture
    double center_freq; 
    double span;
    double rbw;
    double vbw;
    double ref_level;
    double div;
    int atten;
    int gain;
    int detector;

	// Size of sweep
    int trace_len;
	// Start frequency of first bin in sweep
    double trace_start_freq; 
	// Frequency difference between bins in sweep
    double bin_size; 
} BBRHeader;

void parse_bbr_file() {
	FILE *f = fopen("filename.bbr", "rb");
    if(!f) {
        // Error
    }

	BBRHeader header;
	__int64 time;

	// Read in header 
	fread(&header, sizeof(BBRHeader), 1, f);

	// Allocate arrays to hold sweep data
	float *min = (float*)malloc(sizeof(float) * header.trace_len);
	float *max = (float*)malloc(sizeof(float) * header.trace_len);

	// Read in sweeps
	for(int i = 0; i < header.sweep_count; i++) {
		// Get sweep time stamp, epoch time in milliseconds
		fread(&time, sizeof(__int64), 1, f); 
		// Read the min and max sweep arrays
		// For average detectors, min array == max array
		fread(min, sizeof(float) * header.trace_len, 1, f); 
		fread(max, sizeof(float) * header.trace_len, 1, f);
		
		// Do something with data
		// For most applications, the max sweep array is the useful array.
		// Use BBRHeader.trace_start_freq and BBRHeader.bin_size to get the frequency of a given 
		//   index into the sweep array.
	}

	// Done with file
	fclose(f);
	free(min);
	free(max);	
}

int main(int argc, char **argv)
{
    parse_bbr_file();
    return 0;
}