1 files changed, 210 insertions, 0 deletions
diff --git a/third_party/libwebrtc/webrtc/rtc_base/timeutils.cc b/third_party/libwebrtc/webrtc/rtc_base/timeutils.cc
new file mode 100644
index 0000000000..84fa345f18
--- /dev/null
+++ b/third_party/libwebrtc/webrtc/rtc_base/timeutils.cc
@@ -0,0 +1,210 @@
+/*
+ *  Copyright 2004 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.
+ */
+
+#include <stdint.h>
+
+#if defined(WEBRTC_POSIX)
+#include <sys/time.h>
+#if defined(WEBRTC_MAC)
+#include <mach/mach_time.h>
+#endif
+#endif
+
+#if defined(WEBRTC_WIN)
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#include <mmsystem.h>
+#include <sys/timeb.h>
+#endif
+
+#include "rtc_base/checks.h"
+#include "rtc_base/timeutils.h"
+
+namespace rtc {
+
+ClockInterface* g_clock = nullptr;
+
+ClockInterface* SetClockForTesting(ClockInterface* clock) {
+  ClockInterface* prev = g_clock;
+  g_clock = clock;
+  return prev;
+}
+
+ClockInterface* GetClockForTesting() {
+  return g_clock;
+}
+
+int64_t SystemTimeNanos() {
+  int64_t ticks;
+#if defined(WEBRTC_MAC)
+  static mach_timebase_info_data_t timebase;
+  if (timebase.denom == 0) {
+    // Get the timebase if this is the first time we run.
+    // Recommended by Apple's QA1398.
+    if (mach_timebase_info(&timebase) != KERN_SUCCESS) {
+      RTC_NOTREACHED();
+    }
+  }
+  // Use timebase to convert absolute time tick units into nanoseconds.
+  ticks = mach_absolute_time() * timebase.numer / timebase.denom;
+#elif defined(WEBRTC_POSIX)
+  struct timespec ts;
+  // TODO(deadbeef): Do we need to handle the case when CLOCK_MONOTONIC is not
+  // supported?
+  clock_gettime(CLOCK_MONOTONIC, &ts);
+  ticks = kNumNanosecsPerSec * static_cast<int64_t>(ts.tv_sec) +
+          static_cast<int64_t>(ts.tv_nsec);
+#elif defined(WEBRTC_WIN)
+  static volatile LONG last_timegettime = 0;
+  static volatile int64_t num_wrap_timegettime = 0;
+  volatile LONG* last_timegettime_ptr = &last_timegettime;
+  DWORD now = timeGetTime();
+  // Atomically update the last gotten time
+  DWORD old = InterlockedExchange(last_timegettime_ptr, now);
+  if (now < old) {
+    // If now is earlier than old, there may have been a race between threads.
+    // 0x0fffffff ~3.1 days, the code will not take that long to execute
+    // so it must have been a wrap around.
+    if (old > 0xf0000000 && now < 0x0fffffff) {
+      num_wrap_timegettime++;
+    }
+  }
+  ticks = now + (num_wrap_timegettime << 32);
+  // TODO(deadbeef): Calculate with nanosecond precision. Otherwise, we're
+  // just wasting a multiply and divide when doing Time() on Windows.
+  ticks = ticks * kNumNanosecsPerMillisec;
+#else
+#error Unsupported platform.
+#endif
+  return ticks;
+}
+
+int64_t SystemTimeMillis() {
+  return static_cast<int64_t>(SystemTimeNanos() / kNumNanosecsPerMillisec);
+}
+
+int64_t TimeNanos() {
+  if (g_clock) {
+    return g_clock->TimeNanos();
+  }
+  return SystemTimeNanos();
+}
+
+uint32_t Time32() {
+  return static_cast<uint32_t>(TimeNanos() / kNumNanosecsPerMillisec);
+}
+
+int64_t TimeMillis() {
+  return TimeNanos() / kNumNanosecsPerMillisec;
+}
+
+int64_t TimeMicros() {
+  return TimeNanos() / kNumNanosecsPerMicrosec;
+}
+
+int64_t TimeAfter(int64_t elapsed) {
+  RTC_DCHECK_GE(elapsed, 0);
+  return TimeMillis() + elapsed;
+}
+
+int32_t TimeDiff32(uint32_t later, uint32_t earlier) {
+  return later - earlier;
+}
+
+int64_t TimeDiff(int64_t later, int64_t earlier) {
+  return later - earlier;
+}
+
+TimestampWrapAroundHandler::TimestampWrapAroundHandler()
+    : last_ts_(0), num_wrap_(-1) {}
+
+int64_t TimestampWrapAroundHandler::Unwrap(uint32_t ts) {
+  if (num_wrap_ == -1) {
+    last_ts_ = ts;
+    num_wrap_ = 0;
+    return ts;
+  }
+
+  if (ts < last_ts_) {
+    if (last_ts_ >= 0xf0000000 && ts < 0x0fffffff)
+      ++num_wrap_;
+  } else if ((ts - last_ts_) > 0xf0000000) {
+    // Backwards wrap. Unwrap with last wrap count and don't update last_ts_.
+    return ts + (num_wrap_ - 1)*((int64_t)1 << 32);
+  }
+
+  last_ts_ = ts;
+  return ts + (num_wrap_ << 32);
+}
+
+int64_t TmToSeconds(const std::tm& tm) {
+  static short int mdays[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+  static short int cumul_mdays[12] = {0,   31,  59,  90,  120, 151,
+                                      181, 212, 243, 273, 304, 334};
+  int year = tm.tm_year + 1900;
+  int month = tm.tm_mon;
+  int day = tm.tm_mday - 1;  // Make 0-based like the rest.
+  int hour = tm.tm_hour;
+  int min = tm.tm_min;
+  int sec = tm.tm_sec;
+
+  bool expiry_in_leap_year = (year % 4 == 0 &&
+                              (year % 100 != 0 || year % 400 == 0));
+
+  if (year < 1970)
+    return -1;
+  if (month < 0 || month > 11)
+    return -1;
+  if (day < 0 || day >= mdays[month] + (expiry_in_leap_year && month == 2 - 1))
+    return -1;
+  if (hour < 0 || hour > 23)
+    return -1;
+  if (min < 0 || min > 59)
+    return -1;
+  if (sec < 0 || sec > 59)
+    return -1;
+
+  day += cumul_mdays[month];
+
+  // Add number of leap days between 1970 and the expiration year, inclusive.
+  day += ((year / 4 - 1970 / 4) - (year / 100 - 1970 / 100) +
+          (year / 400 - 1970 / 400));
+
+  // We will have added one day too much above if expiration is during a leap
+  // year, and expiration is in January or February.
+  if (expiry_in_leap_year && month <= 2 - 1) // |month| is zero based.
+    day -= 1;
+
+  // Combine all variables into seconds from 1970-01-01 00:00 (except |month|
+  // which was accumulated into |day| above).
+  return (((static_cast<int64_t>
+            (year - 1970) * 365 + day) * 24 + hour) * 60 + min) * 60 + sec;
+}
+
+int64_t TimeUTCMicros() {
+#if defined(WEBRTC_POSIX)
+  struct timeval time;
+  gettimeofday(&time, nullptr);
+  // Convert from second (1.0) and microsecond (1e-6).
+  return (static_cast<int64_t>(time.tv_sec) * rtc::kNumMicrosecsPerSec +
+          time.tv_usec);
+
+#elif defined(WEBRTC_WIN)
+  struct _timeb time;
+  _ftime(&time);
+  // Convert from second (1.0) and milliseconds (1e-3).
+  return (static_cast<int64_t>(time.time) * rtc::kNumMicrosecsPerSec +
+          static_cast<int64_t>(time.millitm) * rtc::kNumMicrosecsPerMillisec);
+#endif
+}
+
+} // namespace rtc