Adds a modified copy of talk/base to webrtc/base. It is the first step in
migrating talk/base to webrtc/base.
BUG=N/A
R=niklas.enbom@webrtc.org
Review URL: https://webrtc-codereview.appspot.com/17479005
git-svn-id: http://webrtc.googlecode.com/svn/trunk@6129 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/base/timeutils.h b/webrtc/base/timeutils.h
new file mode 100644
index 0000000..bdf73cc
--- /dev/null
+++ b/webrtc/base/timeutils.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2005 The WebRTC Project Authors. All rights reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_BASE_TIMEUTILS_H_
+#define WEBRTC_BASE_TIMEUTILS_H_
+
+#include <time.h>
+
+#include "webrtc/base/basictypes.h"
+
+namespace rtc {
+
+static const int64 kNumMillisecsPerSec = INT64_C(1000);
+static const int64 kNumMicrosecsPerSec = INT64_C(1000000);
+static const int64 kNumNanosecsPerSec = INT64_C(1000000000);
+
+static const int64 kNumMicrosecsPerMillisec = kNumMicrosecsPerSec /
+ kNumMillisecsPerSec;
+static const int64 kNumNanosecsPerMillisec = kNumNanosecsPerSec /
+ kNumMillisecsPerSec;
+static const int64 kNumNanosecsPerMicrosec = kNumNanosecsPerSec /
+ kNumMicrosecsPerSec;
+
+// January 1970, in NTP milliseconds.
+static const int64 kJan1970AsNtpMillisecs = INT64_C(2208988800000);
+
+typedef uint32 TimeStamp;
+
+// Returns the current time in milliseconds.
+uint32 Time();
+// Returns the current time in microseconds.
+uint64 TimeMicros();
+// Returns the current time in nanoseconds.
+uint64 TimeNanos();
+
+// Stores current time in *tm and microseconds in *microseconds.
+void CurrentTmTime(struct tm *tm, int *microseconds);
+
+// Returns a future timestamp, 'elapsed' milliseconds from now.
+uint32 TimeAfter(int32 elapsed);
+
+// Comparisons between time values, which can wrap around.
+bool TimeIsBetween(uint32 earlier, uint32 middle, uint32 later); // Inclusive
+bool TimeIsLaterOrEqual(uint32 earlier, uint32 later); // Inclusive
+bool TimeIsLater(uint32 earlier, uint32 later); // Exclusive
+
+// Returns the later of two timestamps.
+inline uint32 TimeMax(uint32 ts1, uint32 ts2) {
+ return TimeIsLaterOrEqual(ts1, ts2) ? ts2 : ts1;
+}
+
+// Returns the earlier of two timestamps.
+inline uint32 TimeMin(uint32 ts1, uint32 ts2) {
+ return TimeIsLaterOrEqual(ts1, ts2) ? ts1 : ts2;
+}
+
+// Number of milliseconds that would elapse between 'earlier' and 'later'
+// timestamps. The value is negative if 'later' occurs before 'earlier'.
+int32 TimeDiff(uint32 later, uint32 earlier);
+
+// The number of milliseconds that have elapsed since 'earlier'.
+inline int32 TimeSince(uint32 earlier) {
+ return TimeDiff(Time(), earlier);
+}
+
+// The number of milliseconds that will elapse between now and 'later'.
+inline int32 TimeUntil(uint32 later) {
+ return TimeDiff(later, Time());
+}
+
+// Converts a unix timestamp in nanoseconds to an NTP timestamp in ms.
+inline int64 UnixTimestampNanosecsToNtpMillisecs(int64 unix_ts_ns) {
+ return unix_ts_ns / kNumNanosecsPerMillisec + kJan1970AsNtpMillisecs;
+}
+
+} // namespace rtc
+
+#endif // WEBRTC_BASE_TIMEUTILS_H_