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2a96ab20b2
Calls to the time functions in Clock can have side effects in some circumstances. It's also questionable if it's a good idea to allow repeated calls to a const method return different values without any changed to the class instance. Bug: webrtc:10270 Change-Id: I316f9788adac954c52b0f9230881b872c54a7ac9 Reviewed-on: https://webrtc-review.googlesource.com/c/120348 Commit-Queue: Sebastian Jansson <srte@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/master@{#26482}
56 lines
1.7 KiB
C++
56 lines
1.7 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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const float DriftingClock::kDoubleSpeed = 2.0f;
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const float DriftingClock::kNoDrift = 1.0f;
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const float DriftingClock::kHalfSpeed = 0.5f;
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DriftingClock::DriftingClock(Clock* clock, float speed)
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: clock_(clock),
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drift_(speed - 1.0f),
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start_time_(clock_->TimeInMicroseconds()) {
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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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float DriftingClock::Drift() const {
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int64_t now = clock_->TimeInMicroseconds();
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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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int64_t DriftingClock::TimeInMilliseconds() {
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return clock_->TimeInMilliseconds() + Drift() / 1000.;
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}
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int64_t DriftingClock::TimeInMicroseconds() {
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return clock_->TimeInMicroseconds() + Drift();
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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() * 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() / 1000.;
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}
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} // namespace test
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} // namespace webrtc
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