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01b7e929e2
Bug: None Change-Id: Ie9e2772c00a57c6020e8d60b0f125b6c442f205b Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/152380 Reviewed-by: Niels Moller <nisse@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#29132}
49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
/*
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* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "test/drifting_clock.h"
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#include "rtc_base/checks.h"
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namespace webrtc {
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namespace test {
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constexpr float DriftingClock::kNoDrift;
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DriftingClock::DriftingClock(Clock* clock, float speed)
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: clock_(clock), drift_(speed - 1.0f), start_time_(clock_->CurrentTime()) {
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RTC_CHECK(clock);
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RTC_CHECK_GT(speed, 0.0f);
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}
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TimeDelta DriftingClock::Drift() const {
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auto now = clock_->CurrentTime();
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RTC_DCHECK_GE(now, start_time_);
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return (now - start_time_) * drift_;
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}
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Timestamp DriftingClock::CurrentTime() {
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return clock_->CurrentTime() + Drift() / 1000.;
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}
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NtpTime DriftingClock::CurrentNtpTime() {
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// NTP precision is 1/2^32 seconds, i.e. 2^32 ntp fractions = 1 second.
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const double kNtpFracPerMicroSecond = 4294.967296; // = 2^32 / 10^6
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NtpTime ntp = clock_->CurrentNtpTime();
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uint64_t total_fractions = static_cast<uint64_t>(ntp);
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total_fractions += Drift().us() * kNtpFracPerMicroSecond;
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return NtpTime(total_fractions);
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}
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int64_t DriftingClock::CurrentNtpInMilliseconds() {
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return clock_->CurrentNtpInMilliseconds() + Drift().ms();
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}
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} // namespace test
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} // namespace webrtc
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