+ char cache_file[BCTEXTLEN];
+ FILE *cache_fp, *active_fp;
+ void reset_cache_file();
+ int open_cache_file();
+ void close_cache_file();
+ int load_cache_line();
+ int locate_cache_line(int64_t key);
+ int get_cache_line(int64_t key);
+ int put_cache_line(const char *line);
+ char cache_line[BCSTRLEN];
+ int64_t cache_key, active_key;
+// add constant frame offset values
+ int dx_offset, dy_offset;
+ int64_t tracking_frame;
+// save/load result values
+ int load_ok;
+ int save_dx, load_dx;
+ int save_dy, load_dy;
+ float save_dt, load_dt;