OLD | NEW |
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 #ifndef CAST_MEDIA_TEST_SKEWED_TICK_CLOCK_H | 5 #ifndef CAST_MEDIA_TEST_SKEWED_TICK_CLOCK_H |
6 #define CAST_MEDIA_TEST_SKEWED_TICK_CLOCK_H | 6 #define CAST_MEDIA_TEST_SKEWED_TICK_CLOCK_H |
7 | 7 |
8 #include "base/time/tick_clock.h" | 8 #include "base/time/tick_clock.h" |
9 #include "base/time/time.h" | 9 #include "base/time/time.h" |
10 | 10 |
11 namespace media { | 11 namespace media { |
12 namespace cast { | 12 namespace cast { |
13 namespace test { | 13 namespace test { |
14 | 14 |
15 // Wraps a base::TickClock, and lets you change the speed and offset | 15 // Wraps a base::TickClock, and lets you change the speed and offset |
16 // of time compared to the wrapped clock. See SetSkew for how usage. | 16 // of time compared to the wrapped clock. See SetSkew for how usage. |
17 class SkewedTickClock : public base::TickClock { | 17 class SkewedTickClock : public base::TickClock { |
18 public: | 18 public: |
19 // Does not take ownership of |clock_|. | 19 // Does not take ownership of |clock_|. |
20 explicit SkewedTickClock(base::TickClock* clock_); | 20 explicit SkewedTickClock(base::TickClock* clock_); |
21 // |skew| > 1.0 means clock runs faster. | 21 // |skew| > 1.0 means clock runs faster. |
22 // |offset| > 0 means clock returns times from the future. | 22 // |offset| > 0 means clock returns times from the future. |
23 // Note, |offset| is cumulative. | 23 // Note, |offset| is cumulative. |
24 // Also note that changing the skew will never make the clock | 24 // Also note that changing the skew will never make the clock |
25 // jump forwards or backwards, only changing the offset will | 25 // jump forwards or backwards, only changing the offset will |
26 // do that. | 26 // do that. |
27 void SetSkew(double skew, base::TimeDelta offset); | 27 void SetSkew(double skew, base::TimeDelta offset); |
28 virtual base::TimeTicks NowTicks() OVERRIDE; | 28 virtual base::TimeTicks NowTicks() override; |
29 | 29 |
30 private: | 30 private: |
31 base::TimeTicks SkewTicks(base::TimeTicks now); | 31 base::TimeTicks SkewTicks(base::TimeTicks now); |
32 base::TickClock* clock_; // Not owned. | 32 base::TickClock* clock_; // Not owned. |
33 double skew_; | 33 double skew_; |
34 base::TimeTicks last_skew_set_time_; | 34 base::TimeTicks last_skew_set_time_; |
35 base::TimeTicks skew_clock_at_last_set_; | 35 base::TimeTicks skew_clock_at_last_set_; |
36 | 36 |
37 DISALLOW_COPY_AND_ASSIGN(SkewedTickClock); | 37 DISALLOW_COPY_AND_ASSIGN(SkewedTickClock); |
38 }; | 38 }; |
39 | 39 |
40 } // namespace test | 40 } // namespace test |
41 } // namespace cast | 41 } // namespace cast |
42 } // namespace media | 42 } // namespace media |
43 | 43 |
44 #endif // CAST_MEDIA_TEST_SKEWED_TICK_CLOCK_H | 44 #endif // CAST_MEDIA_TEST_SKEWED_TICK_CLOCK_H |
OLD | NEW |