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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_(0.0) { |
| 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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