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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/base/time_delta_interpolator.h" | 5 #include "media/base/time_delta_interpolator.h" |
6 | 6 |
7 #include <stdint.h> | 7 #include <stdint.h> |
8 | 8 |
9 #include <algorithm> | 9 #include <algorithm> |
10 | 10 |
11 #include "base/logging.h" | 11 #include "base/logging.h" |
12 #include "base/time/tick_clock.h" | 12 #include "base/time/tick_clock.h" |
13 #include "media/base/timestamp_constants.h" | 13 #include "media/base/timestamp_constants.h" |
14 | 14 |
15 namespace media { | 15 namespace media { |
16 | 16 |
17 TimeDeltaInterpolator::TimeDeltaInterpolator(base::TickClock* tick_clock) | 17 TimeDeltaInterpolator::TimeDeltaInterpolator(base::TickClock* tick_clock) |
18 : tick_clock_(tick_clock), | 18 : tick_clock_(tick_clock), |
19 interpolating_(false), | 19 interpolating_(false), |
20 upper_bound_(kNoTimestamp), | 20 upper_bound_(kNoTimestamp), |
21 playback_rate_(1.0) { | 21 playback_rate_(0) { |
22 DCHECK(tick_clock_); | 22 DCHECK(tick_clock_); |
23 } | 23 } |
24 | 24 |
25 TimeDeltaInterpolator::~TimeDeltaInterpolator() { | 25 TimeDeltaInterpolator::~TimeDeltaInterpolator() { |
26 } | 26 } |
27 | 27 |
28 base::TimeDelta TimeDeltaInterpolator::StartInterpolating() { | 28 base::TimeDelta TimeDeltaInterpolator::StartInterpolating() { |
29 DCHECK(!interpolating_); | 29 DCHECK(!interpolating_); |
30 reference_ = tick_clock_->NowTicks(); | 30 reference_ = tick_clock_->NowTicks(); |
31 interpolating_ = true; | 31 interpolating_ = true; |
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72 base::TimeDelta interpolated_time = | 72 base::TimeDelta interpolated_time = |
73 lower_bound_ + base::TimeDelta::FromMicroseconds(now_us); | 73 lower_bound_ + base::TimeDelta::FromMicroseconds(now_us); |
74 | 74 |
75 if (upper_bound_ == kNoTimestamp) | 75 if (upper_bound_ == kNoTimestamp) |
76 return interpolated_time; | 76 return interpolated_time; |
77 | 77 |
78 return std::min(interpolated_time, upper_bound_); | 78 return std::min(interpolated_time, upper_bound_); |
79 } | 79 } |
80 | 80 |
81 } // namespace media | 81 } // namespace media |
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