1 /* 2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 #ifndef TEST_DRIFTING_CLOCK_H_ 11 #define TEST_DRIFTING_CLOCK_H_ 12 13 #include <stdint.h> 14 15 #include "system_wrappers/include/clock.h" 16 #include "system_wrappers/include/ntp_time.h" 17 18 namespace webrtc { 19 namespace test { 20 class DriftingClock : public Clock { 21 public: 22 static constexpr float kNoDrift = 1.0f; 23 24 DriftingClock(Clock* clock, float speed); 25 PercentsFaster(float percent)26 static constexpr float PercentsFaster(float percent) { 27 return 1.0f + percent / 100.0f; 28 } PercentsSlower(float percent)29 static constexpr float PercentsSlower(float percent) { 30 return 1.0f - percent / 100.0f; 31 } 32 CurrentTime()33 Timestamp CurrentTime() override { return Drift(clock_->CurrentTime()); } ConvertTimestampToNtpTime(Timestamp timestamp)34 NtpTime ConvertTimestampToNtpTime(Timestamp timestamp) override { 35 return Drift(clock_->ConvertTimestampToNtpTime(timestamp)); 36 } 37 38 private: 39 TimeDelta Drift() const; 40 Timestamp Drift(Timestamp timestamp) const; 41 NtpTime Drift(NtpTime ntp_time) const; 42 43 Clock* const clock_; 44 const float drift_; 45 const Timestamp start_time_; 46 }; 47 } // namespace test 48 } // namespace webrtc 49 50 #endif // TEST_DRIFTING_CLOCK_H_ 51