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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/logging.h"
#include "base/test/simple_test_tick_clock.h"
#include "media/base/time_delta_interpolator.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace media {
class TimeDeltaInterpolatorTest : public ::testing::Test {
public:
TimeDeltaInterpolatorTest() : interpolator_(&test_tick_clock_) {}
protected:
void AdvanceSystemTime(base::TimeDelta delta) {
test_tick_clock_.Advance(delta);
}
base::SimpleTestTickClock test_tick_clock_;
TimeDeltaInterpolator interpolator_;
};
TEST_F(TimeDeltaInterpolatorTest, Created) {
const base::TimeDelta kExpected = base::TimeDelta::FromSeconds(0);
EXPECT_EQ(kExpected, interpolator_.GetInterpolatedTime());
}
TEST_F(TimeDeltaInterpolatorTest, StartInterpolating_NormalSpeed) {
const base::TimeDelta kZero;
const base::TimeDelta kTimeToAdvance = base::TimeDelta::FromSeconds(2);
EXPECT_EQ(kZero, interpolator_.StartInterpolating());
AdvanceSystemTime(kTimeToAdvance);
EXPECT_EQ(kTimeToAdvance, interpolator_.GetInterpolatedTime());
}
TEST_F(TimeDeltaInterpolatorTest, StartInterpolating_DoubleSpeed) {
const base::TimeDelta kZero;
const base::TimeDelta kTimeToAdvance = base::TimeDelta::FromSeconds(5);
interpolator_.SetPlaybackRate(2.0);
EXPECT_EQ(kZero, interpolator_.StartInterpolating());
AdvanceSystemTime(kTimeToAdvance);
EXPECT_EQ(2 * kTimeToAdvance, interpolator_.GetInterpolatedTime());
}
TEST_F(TimeDeltaInterpolatorTest, StartInterpolating_HalfSpeed) {
const base::TimeDelta kZero;
const base::TimeDelta kTimeToAdvance = base::TimeDelta::FromSeconds(4);
interpolator_.SetPlaybackRate(0.5);
EXPECT_EQ(kZero, interpolator_.StartInterpolating());
AdvanceSystemTime(kTimeToAdvance);
EXPECT_EQ(kTimeToAdvance / 2, interpolator_.GetInterpolatedTime());
}
TEST_F(TimeDeltaInterpolatorTest, StartInterpolating_ZeroSpeed) {
// We'll play for 2 seconds at normal speed, 4 seconds at zero speed, and 8
// seconds at normal speed.
const base::TimeDelta kZero;
const base::TimeDelta kPlayDuration1 = base::TimeDelta::FromSeconds(2);
const base::TimeDelta kPlayDuration2 = base::TimeDelta::FromSeconds(4);
const base::TimeDelta kPlayDuration3 = base::TimeDelta::FromSeconds(8);
const base::TimeDelta kExpected = kPlayDuration1 + kPlayDuration3;
EXPECT_EQ(kZero, interpolator_.StartInterpolating());
AdvanceSystemTime(kPlayDuration1);
interpolator_.SetPlaybackRate(0.0);
AdvanceSystemTime(kPlayDuration2);
interpolator_.SetPlaybackRate(1.0);
AdvanceSystemTime(kPlayDuration3);
EXPECT_EQ(kExpected, interpolator_.GetInterpolatedTime());
}
TEST_F(TimeDeltaInterpolatorTest, StartInterpolating_MultiSpeed) {
// We'll play for 2 seconds at half speed, 4 seconds at normal speed, and 8
// seconds at double speed.
const base::TimeDelta kZero;
const base::TimeDelta kPlayDuration1 = base::TimeDelta::FromSeconds(2);
const base::TimeDelta kPlayDuration2 = base::TimeDelta::FromSeconds(4);
const base::TimeDelta kPlayDuration3 = base::TimeDelta::FromSeconds(8);
const base::TimeDelta kExpected =
kPlayDuration1 / 2 + kPlayDuration2 + 2 * kPlayDuration3;
interpolator_.SetPlaybackRate(0.5);
EXPECT_EQ(kZero, interpolator_.StartInterpolating());
AdvanceSystemTime(kPlayDuration1);
interpolator_.SetPlaybackRate(1.0);
AdvanceSystemTime(kPlayDuration2);
interpolator_.SetPlaybackRate(2.0);
AdvanceSystemTime(kPlayDuration3);
EXPECT_EQ(kExpected, interpolator_.GetInterpolatedTime());
}
TEST_F(TimeDeltaInterpolatorTest, StopInterpolating) {
const base::TimeDelta kZero;
const base::TimeDelta kPlayDuration = base::TimeDelta::FromSeconds(4);
const base::TimeDelta kPauseDuration = base::TimeDelta::FromSeconds(20);
const base::TimeDelta kExpectedFirstPause = kPlayDuration;
const base::TimeDelta kExpectedSecondPause = 2 * kPlayDuration;
// Play for 4 seconds.
EXPECT_EQ(kZero, interpolator_.StartInterpolating());
AdvanceSystemTime(kPlayDuration);
// Pause for 20 seconds.
EXPECT_EQ(kExpectedFirstPause, interpolator_.StopInterpolating());
EXPECT_EQ(kExpectedFirstPause, interpolator_.GetInterpolatedTime());
AdvanceSystemTime(kPauseDuration);
EXPECT_EQ(kExpectedFirstPause, interpolator_.GetInterpolatedTime());
// Play again for 4 more seconds.
EXPECT_EQ(kExpectedFirstPause, interpolator_.StartInterpolating());
AdvanceSystemTime(kPlayDuration);
EXPECT_EQ(kExpectedSecondPause, interpolator_.StopInterpolating());
EXPECT_EQ(kExpectedSecondPause, interpolator_.GetInterpolatedTime());
}
TEST_F(TimeDeltaInterpolatorTest, SetBounds_Stopped) {
const base::TimeDelta kFirstTime = base::TimeDelta::FromSeconds(4);
const base::TimeDelta kSecondTime = base::TimeDelta::FromSeconds(16);
const base::TimeDelta kArbitraryMaxTime = base::TimeDelta::FromSeconds(100);
interpolator_.SetBounds(kFirstTime, kArbitraryMaxTime);
EXPECT_EQ(kFirstTime, interpolator_.GetInterpolatedTime());
interpolator_.SetBounds(kSecondTime, kArbitraryMaxTime);
EXPECT_EQ(kSecondTime, interpolator_.GetInterpolatedTime());
}
TEST_F(TimeDeltaInterpolatorTest, SetBounds_Started) {
// We'll play for 4 seconds, then set the time to 12, then play for 4 more
// seconds.
const base::TimeDelta kZero;
const base::TimeDelta kPlayDuration = base::TimeDelta::FromSeconds(4);
const base::TimeDelta kUpdatedTime = base::TimeDelta::FromSeconds(12);
const base::TimeDelta kArbitraryMaxTime = base::TimeDelta::FromSeconds(100);
const base::TimeDelta kExpected = kUpdatedTime + kPlayDuration;
EXPECT_EQ(kZero, interpolator_.StartInterpolating());
AdvanceSystemTime(kPlayDuration);
interpolator_.SetBounds(kUpdatedTime, kArbitraryMaxTime);
AdvanceSystemTime(kPlayDuration);
EXPECT_EQ(kExpected, interpolator_.GetInterpolatedTime());
}
TEST_F(TimeDeltaInterpolatorTest, SetUpperBound) {
const base::TimeDelta kZero;
const base::TimeDelta kTimeInterval = base::TimeDelta::FromSeconds(4);
const base::TimeDelta kMaxTime = base::TimeDelta::FromSeconds(6);
EXPECT_EQ(kZero, interpolator_.StartInterpolating());
interpolator_.SetUpperBound(kMaxTime);
AdvanceSystemTime(kTimeInterval);
EXPECT_EQ(kTimeInterval, interpolator_.GetInterpolatedTime());
AdvanceSystemTime(kTimeInterval);
EXPECT_EQ(kMaxTime, interpolator_.GetInterpolatedTime());
AdvanceSystemTime(kTimeInterval);
EXPECT_EQ(kMaxTime, interpolator_.GetInterpolatedTime());
}
TEST_F(TimeDeltaInterpolatorTest, SetUpperBound_MultipleTimes) {
const base::TimeDelta kZero;
const base::TimeDelta kTimeInterval = base::TimeDelta::FromSeconds(4);
const base::TimeDelta kMaxTime0 = base::TimeDelta::FromSeconds(120);
const base::TimeDelta kMaxTime1 = base::TimeDelta::FromSeconds(6);
const base::TimeDelta kMaxTime2 = base::TimeDelta::FromSeconds(12);
EXPECT_EQ(kZero, interpolator_.StartInterpolating());
interpolator_.SetUpperBound(kMaxTime0);
AdvanceSystemTime(kTimeInterval);
EXPECT_EQ(kTimeInterval, interpolator_.GetInterpolatedTime());
interpolator_.SetUpperBound(kMaxTime1);
AdvanceSystemTime(kTimeInterval);
EXPECT_EQ(kMaxTime1, interpolator_.GetInterpolatedTime());
AdvanceSystemTime(kTimeInterval);
EXPECT_EQ(kMaxTime1, interpolator_.GetInterpolatedTime());
interpolator_.SetUpperBound(kMaxTime2);
EXPECT_EQ(kMaxTime1, interpolator_.GetInterpolatedTime());
AdvanceSystemTime(kTimeInterval);
EXPECT_EQ(kMaxTime1 + kTimeInterval, interpolator_.GetInterpolatedTime());
AdvanceSystemTime(kTimeInterval);
EXPECT_EQ(kMaxTime2, interpolator_.GetInterpolatedTime());
}
} // namespace media
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