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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #include "media/cast/common/clock_drift_smoother.h" | 5 #include "media/cast/common/clock_drift_smoother.h" |
| 6 | 6 |
| 7 #include "base/logging.h" | 7 #include "base/logging.h" |
| 8 | 8 |
| 9 namespace media { | 9 namespace media { |
| 10 namespace cast { | 10 namespace cast { |
| 11 | 11 |
| 12 ClockDriftSmoother::ClockDriftSmoother(base::TimeDelta time_constant) | 12 ClockDriftSmoother::ClockDriftSmoother(base::TimeDelta time_constant) |
| 13 : time_constant_(time_constant), | 13 : time_constant_(time_constant), |
| 14 estimate_us_(0.0) { | 14 estimate_us_(0.0) { |
| 15 DCHECK(time_constant_ > base::TimeDelta()); | 15 DCHECK(time_constant_ > base::TimeDelta()); |
| 16 } | 16 } |
| 17 | 17 |
| 18 ClockDriftSmoother::~ClockDriftSmoother() {} | 18 ClockDriftSmoother::~ClockDriftSmoother() {} |
| 19 | 19 |
| 20 base::TimeDelta ClockDriftSmoother::Current() const { | 20 base::TimeDelta ClockDriftSmoother::Current() const { |
| 21 DCHECK(!last_update_time_.is_null()); | 21 DCHECK(!last_update_time_.is_null()); |
| 22 return base::TimeDelta::FromMicroseconds( | 22 return base::TimeDelta::FromMicroseconds(static_cast<int64_t>( |
| 23 static_cast<int64>(estimate_us_ + 0.5)); // Round to nearest microsecond. | 23 estimate_us_ + 0.5)); // Round to nearest microsecond. |
| 24 } | 24 } |
| 25 | 25 |
| 26 void ClockDriftSmoother::Reset(base::TimeTicks now, | 26 void ClockDriftSmoother::Reset(base::TimeTicks now, |
| 27 base::TimeDelta measured_offset) { | 27 base::TimeDelta measured_offset) { |
| 28 DCHECK(!now.is_null()); | 28 DCHECK(!now.is_null()); |
| 29 last_update_time_ = now; | 29 last_update_time_ = now; |
| 30 estimate_us_ = static_cast<double>(measured_offset.InMicroseconds()); | 30 estimate_us_ = static_cast<double>(measured_offset.InMicroseconds()); |
| 31 } | 31 } |
| 32 | 32 |
| 33 void ClockDriftSmoother::Update(base::TimeTicks now, | 33 void ClockDriftSmoother::Update(base::TimeTicks now, |
| (...skipping 16 matching lines...) Expand all Loading... |
| 50 } | 50 } |
| 51 | 51 |
| 52 // static | 52 // static |
| 53 base::TimeDelta ClockDriftSmoother::GetDefaultTimeConstant() { | 53 base::TimeDelta ClockDriftSmoother::GetDefaultTimeConstant() { |
| 54 static const int kDefaultTimeConstantInSeconds = 30; | 54 static const int kDefaultTimeConstantInSeconds = 30; |
| 55 return base::TimeDelta::FromSeconds(kDefaultTimeConstantInSeconds); | 55 return base::TimeDelta::FromSeconds(kDefaultTimeConstantInSeconds); |
| 56 } | 56 } |
| 57 | 57 |
| 58 } // namespace cast | 58 } // namespace cast |
| 59 } // namespace media | 59 } // namespace media |
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