1 files changed, 65 insertions, 0 deletions
diff --git a/src/timestamp.c b/src/timestamp.c
new file mode 100644
index 0000000..dedf8d9
--- /dev/null
+++ b/src/timestamp.c
@@ -0,0 +1,65 @@
+/**
+ * @file timestamp.c  Timestamp helpers
+ *
+ * Copyright (C) 2010 Creytiv.com
+ */
+
+#include <re.h>
+#include <baresip.h>
+#include "core.h"
+
+
+/**
+ * Check if a 32-bit timestamp wraps around
+ *
+ * @param ts_new  Timestamp of the current packet
+ * @param ts_old  Timestamp of the previous packet
+ *
+ * @return Integer describing the wrap-around
+
+ * @retval -1  backwards wrap-around
+ * @retval  0  no wrap-around
+ * @retval  1  forward wrap-around
+ */
+int timestamp_wrap(uint32_t ts_new, uint32_t ts_old)
+{
+	int32_t delta;
+
+	if (ts_new < ts_old) {
+
+		delta = (int32_t)ts_new - (int32_t)ts_old;
+
+		if (delta > 0)
+			return 1;
+	}
+	else if ((int32_t)(ts_old - ts_new) > 0) {
+
+		return -1;
+	}
+
+	return 0;
+}
+
+
+/**
+ * Calculate the total timestamp duration, in timestamp units.
+ * The duration is calculated as the delta between the
+ * last extended timestamp and the first extended timestamp.
+ *
+ * @param ts  Receiver timestamp struct
+ *
+ * @return Timestamp duration
+ */
+uint64_t timestamp_duration(const struct timestamp_recv *ts)
+{
+	uint64_t last_ext;
+
+	if (!ts || !ts->is_set)
+		return 0;
+
+	last_ext = calc_extended_timestamp(ts->num_wraps, ts->last);
+
+	return last_ext - ts->first;
+}
+
+