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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, |
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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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