1 files changed, 55 insertions, 0 deletions
diff --git a/include/grgsm/misc_utils/fn_time.h b/include/grgsm/misc_utils/fn_time.h
new file mode 100644
index 0000000..b26c21b
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+++ b/include/grgsm/misc_utils/fn_time.h
@@ -0,0 +1,55 @@
+/* -*- c++ -*- */
+/* @file
+ * @author Piotr Krysik <ptrkrysik@gmail.com>
+ * @author Vadim Yanitskiy <axilirator@gmail.com>
+ * @section LICENSE
+ * 
+ * Gr-gsm is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * Gr-gsm is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with gr-gsm; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ * 
+ */
+
+
+#ifndef INCLUDED_GRGSM_FN_TIME_H
+#define INCLUDED_GRGSM_FN_TIME_H
+
+#include <grgsm/api.h>
+#include <stdint.h>
+#include <utility>
+
+namespace gr {
+  namespace gsm {
+   
+    /**
+     * Computes difference between reference frame number
+     * and a second frame number. 
+     * @param  fn_ref    reference frame number modulo GSM_HYPER_FRAME
+     * @param  fn        second frame number modulo GSM_HYPER_FRAME
+     * @param  time_ref  precise timestamp of the first sample in the fn_ref
+     * @param  time_hint coarse time for fn that is used as a hint to avoid
+     *                   ambiguities caused by modulo operation applied to
+     *                   frame numbers
+     * @return           difference between fn_ref and fn
+     */
+     typedef std::pair<unsigned long long, double> time_format;
+     
+    GRGSM_API time_format fn_time_delta_cpp(uint32_t fn_ref, time_format time_ref, uint32_t fn_x,
+      time_format time_hint, uint32_t ts_num, uint32_t ts_ref);
+
+  } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_GRGSM_FN_TIME_H */
+