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/*
* 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 <ctime>
#include <time.h>
#include "webrtc/base/basictypes.h"
namespace rtc {
static const int64_t kNumMillisecsPerSec = INT64_C(1000);
static const int64_t kNumMicrosecsPerSec = INT64_C(1000000);
static const int64_t kNumNanosecsPerSec = INT64_C(1000000000);
static const int64_t kNumMicrosecsPerMillisec =
kNumMicrosecsPerSec / kNumMillisecsPerSec;
static const int64_t kNumNanosecsPerMillisec =
kNumNanosecsPerSec / kNumMillisecsPerSec;
static const int64_t kNumNanosecsPerMicrosec =
kNumNanosecsPerSec / kNumMicrosecsPerSec;
// January 1970, in NTP milliseconds.
static const int64_t kJan1970AsNtpMillisecs = INT64_C(2208988800000);
typedef uint32_t TimeStamp;
// Returns the current time in milliseconds.
uint32_t Time();
// Returns the current time in microseconds.
uint64_t TimeMicros();
// Returns the current time in nanoseconds.
uint64_t 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_t TimeAfter(int32_t elapsed);
// Comparisons between time values, which can wrap around.
bool TimeIsBetween(uint32_t earlier,
uint32_t middle,
uint32_t later); // Inclusive
bool TimeIsLaterOrEqual(uint32_t earlier, uint32_t later); // Inclusive
bool TimeIsLater(uint32_t earlier, uint32_t later); // Exclusive
// Returns the later of two timestamps.
inline uint32_t TimeMax(uint32_t ts1, uint32_t ts2) {
return TimeIsLaterOrEqual(ts1, ts2) ? ts2 : ts1;
}
// Returns the earlier of two timestamps.
inline uint32_t TimeMin(uint32_t ts1, uint32_t 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_t TimeDiff(uint32_t later, uint32_t earlier);
// The number of milliseconds that have elapsed since 'earlier'.
inline int32_t TimeSince(uint32_t earlier) {
return TimeDiff(Time(), earlier);
}
// The number of milliseconds that will elapse between now and 'later'.
inline int32_t TimeUntil(uint32_t later) {
return TimeDiff(later, Time());
}
// Converts a unix timestamp in nanoseconds to an NTP timestamp in ms.
inline int64_t UnixTimestampNanosecsToNtpMillisecs(int64_t unix_ts_ns) {
return unix_ts_ns / kNumNanosecsPerMillisec + kJan1970AsNtpMillisecs;
}
class TimestampWrapAroundHandler {
public:
TimestampWrapAroundHandler();
int64_t Unwrap(uint32_t ts);
private:
uint32_t last_ts_;
int64_t num_wrap_;
};
// Convert from std::tm, which is relative to 1900-01-01 00:00 to number of
// seconds from 1970-01-01 00:00 ("epoch"). Don't return time_t since that
// is still 32 bits on many systems.
int64_t TmToSeconds(const std::tm& tm);
} // namespace rtc
#endif // WEBRTC_BASE_TIMEUTILS_H_
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