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The timestamps returned by the clocks do not have an epoch. Each clock should be able to convert a timestamp it returns to an NTP time. The default implementation for querying for an NTP time is converting the current timestamp. This is favored over returning the offset between the relative and the NTP time because there is a field trial that makes the real clock revert to using system dependent methods for getting the NTP time. Bug: webrtc:11327 Change-Id: Ia139b2744b407cae94420bf9112212ec577efb16 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/219687 Reviewed-by: Minyue Li <minyue@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Commit-Queue: Paul Hallak <phallak@google.com> Cr-Commit-Position: refs/heads/master@{#34071}
51 lines
1.5 KiB
C++
51 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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#ifndef TEST_DRIFTING_CLOCK_H_
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#define TEST_DRIFTING_CLOCK_H_
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#include <stdint.h>
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#include "system_wrappers/include/clock.h"
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#include "system_wrappers/include/ntp_time.h"
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namespace webrtc {
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namespace test {
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class DriftingClock : public Clock {
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public:
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static constexpr float kNoDrift = 1.0f;
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DriftingClock(Clock* clock, float speed);
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static constexpr float PercentsFaster(float percent) {
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return 1.0f + percent / 100.0f;
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}
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static constexpr float PercentsSlower(float percent) {
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return 1.0f - percent / 100.0f;
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}
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Timestamp CurrentTime() override { return Drift(clock_->CurrentTime()); }
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NtpTime CurrentNtpTime() override { return Drift(clock_->CurrentNtpTime()); }
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NtpTime ConvertTimestampToNtpTime(Timestamp timestamp) override {
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return Drift(clock_->ConvertTimestampToNtpTime(timestamp));
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}
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private:
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TimeDelta Drift() const;
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Timestamp Drift(Timestamp timestamp) const;
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NtpTime Drift(NtpTime ntp_time) const;
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Clock* const clock_;
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const float drift_;
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const Timestamp start_time_;
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};
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} // namespace test
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} // namespace webrtc
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#endif // TEST_DRIFTING_CLOCK_H_
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