| /* |
| * Copyright (c) 2019 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #include "common_video/frame_rate_estimator.h" |
| |
| #include "system_wrappers/include/clock.h" |
| #include "test/gmock.h" |
| #include "test/gtest.h" |
| |
| namespace webrtc { |
| namespace { |
| constexpr TimeDelta kDefaultWindow = TimeDelta::Millis<1000>(); |
| } |
| |
| class FrameRateEstimatorTest : public ::testing::Test { |
| public: |
| FrameRateEstimatorTest() : clock_(123), estimator_(kDefaultWindow) {} |
| |
| protected: |
| SimulatedClock clock_; |
| FrameRateEstimator estimator_; |
| }; |
| |
| TEST_F(FrameRateEstimatorTest, NoEstimateWithLessThanTwoFrames) { |
| EXPECT_FALSE(estimator_.GetAverageFps()); |
| estimator_.OnFrame(clock_.CurrentTime()); |
| EXPECT_FALSE(estimator_.GetAverageFps()); |
| clock_.AdvanceTime(TimeDelta::ms(33)); |
| EXPECT_FALSE(estimator_.GetAverageFps()); |
| } |
| |
| TEST_F(FrameRateEstimatorTest, NoEstimateWithZeroSpan) { |
| // Two frames, but they are spanning 0ms so can't estimate frame rate. |
| estimator_.OnFrame(clock_.CurrentTime()); |
| estimator_.OnFrame(clock_.CurrentTime()); |
| EXPECT_FALSE(estimator_.GetAverageFps()); |
| } |
| |
| TEST_F(FrameRateEstimatorTest, SingleSpanFps) { |
| const double kExpectedFps = 30.0; |
| estimator_.OnFrame(clock_.CurrentTime()); |
| clock_.AdvanceTime(TimeDelta::seconds(1) / kExpectedFps); |
| estimator_.OnFrame(clock_.CurrentTime()); |
| EXPECT_NEAR(*estimator_.GetAverageFps(), kExpectedFps, 0.001); |
| } |
| |
| TEST_F(FrameRateEstimatorTest, AverageFps) { |
| // Insert frames a intervals corresponding to 10fps for half the window, then |
| // 40fps half the window. The average should be 20fps. |
| const double kLowFps = 10.0; |
| const double kHighFps = 30.0; |
| const double kExpectedFps = 20.0; |
| |
| const Timestamp start_time = clock_.CurrentTime(); |
| while (clock_.CurrentTime() - start_time < kDefaultWindow / 2) { |
| estimator_.OnFrame(clock_.CurrentTime()); |
| clock_.AdvanceTime(TimeDelta::seconds(1) / kLowFps); |
| } |
| while (clock_.CurrentTime() - start_time < kDefaultWindow) { |
| estimator_.OnFrame(clock_.CurrentTime()); |
| clock_.AdvanceTime(TimeDelta::seconds(1) / kHighFps); |
| } |
| |
| EXPECT_NEAR(*estimator_.GetAverageFps(), kExpectedFps, 0.001); |
| } |
| |
| TEST_F(FrameRateEstimatorTest, CullsOldFramesFromAveragingWindow) { |
| // Two frames, just on the border of the 1s window => 1 fps. |
| estimator_.OnFrame(clock_.CurrentTime()); |
| clock_.AdvanceTime(kDefaultWindow); |
| estimator_.OnFrame(clock_.CurrentTime()); |
| EXPECT_TRUE(estimator_.GetAverageFps()); |
| EXPECT_NEAR(*estimator_.GetAverageFps(), 1.0, 0.001); |
| |
| // Oldest frame should just be pushed out the window, leaving a single frame |
| // => no estimate possible. |
| clock_.AdvanceTime(TimeDelta::us(1)); |
| EXPECT_FALSE(estimator_.GetAverageFps(clock_.CurrentTime())); |
| } |
| |
| TEST_F(FrameRateEstimatorTest, Reset) { |
| estimator_.OnFrame(clock_.CurrentTime()); |
| clock_.AdvanceTime(TimeDelta::seconds(1) / 30); |
| estimator_.OnFrame(clock_.CurrentTime()); |
| EXPECT_TRUE(estimator_.GetAverageFps()); |
| |
| // Clear estimator, no estimate should be possible even after inserting one |
| // new frame. |
| estimator_.Reset(); |
| EXPECT_FALSE(estimator_.GetAverageFps()); |
| clock_.AdvanceTime(TimeDelta::seconds(1) / 30); |
| estimator_.OnFrame(clock_.CurrentTime()); |
| EXPECT_FALSE(estimator_.GetAverageFps()); |
| } |
| |
| } // namespace webrtc |