Erik Språng | 7daf550 | 2019-08-14 11:04:40 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2019 The WebRTC project authors. All Rights Reserved. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license |
| 5 | * that can be found in the LICENSE file in the root of the source |
| 6 | * tree. An additional intellectual property rights grant can be found |
| 7 | * in the file PATENTS. All contributing project authors may |
| 8 | * be found in the AUTHORS file in the root of the source tree. |
| 9 | */ |
| 10 | |
| 11 | #include "common_video/frame_rate_estimator.h" |
| 12 | |
| 13 | #include "system_wrappers/include/clock.h" |
| 14 | #include "test/gmock.h" |
| 15 | #include "test/gtest.h" |
| 16 | |
| 17 | namespace webrtc { |
| 18 | namespace { |
Danil Chapovalov | 0c626af | 2020-02-10 11:16:00 +0100 | [diff] [blame] | 19 | constexpr TimeDelta kDefaultWindow = TimeDelta::Millis(1000); |
Erik Språng | 7daf550 | 2019-08-14 11:04:40 +0200 | [diff] [blame] | 20 | } |
| 21 | |
| 22 | class FrameRateEstimatorTest : public ::testing::Test { |
| 23 | public: |
| 24 | FrameRateEstimatorTest() : clock_(123), estimator_(kDefaultWindow) {} |
| 25 | |
| 26 | protected: |
| 27 | SimulatedClock clock_; |
| 28 | FrameRateEstimator estimator_; |
| 29 | }; |
| 30 | |
| 31 | TEST_F(FrameRateEstimatorTest, NoEstimateWithLessThanTwoFrames) { |
| 32 | EXPECT_FALSE(estimator_.GetAverageFps()); |
| 33 | estimator_.OnFrame(clock_.CurrentTime()); |
| 34 | EXPECT_FALSE(estimator_.GetAverageFps()); |
Danil Chapovalov | 0c626af | 2020-02-10 11:16:00 +0100 | [diff] [blame] | 35 | clock_.AdvanceTime(TimeDelta::Millis(33)); |
Erik Språng | 7daf550 | 2019-08-14 11:04:40 +0200 | [diff] [blame] | 36 | EXPECT_FALSE(estimator_.GetAverageFps()); |
| 37 | } |
| 38 | |
| 39 | TEST_F(FrameRateEstimatorTest, NoEstimateWithZeroSpan) { |
| 40 | // Two frames, but they are spanning 0ms so can't estimate frame rate. |
| 41 | estimator_.OnFrame(clock_.CurrentTime()); |
| 42 | estimator_.OnFrame(clock_.CurrentTime()); |
| 43 | EXPECT_FALSE(estimator_.GetAverageFps()); |
| 44 | } |
| 45 | |
| 46 | TEST_F(FrameRateEstimatorTest, SingleSpanFps) { |
| 47 | const double kExpectedFps = 30.0; |
| 48 | estimator_.OnFrame(clock_.CurrentTime()); |
Danil Chapovalov | 0c626af | 2020-02-10 11:16:00 +0100 | [diff] [blame] | 49 | clock_.AdvanceTime(TimeDelta::Seconds(1) / kExpectedFps); |
Erik Språng | 7daf550 | 2019-08-14 11:04:40 +0200 | [diff] [blame] | 50 | estimator_.OnFrame(clock_.CurrentTime()); |
| 51 | EXPECT_NEAR(*estimator_.GetAverageFps(), kExpectedFps, 0.001); |
| 52 | } |
| 53 | |
| 54 | TEST_F(FrameRateEstimatorTest, AverageFps) { |
| 55 | // Insert frames a intervals corresponding to 10fps for half the window, then |
| 56 | // 40fps half the window. The average should be 20fps. |
| 57 | const double kLowFps = 10.0; |
| 58 | const double kHighFps = 30.0; |
| 59 | const double kExpectedFps = 20.0; |
| 60 | |
| 61 | const Timestamp start_time = clock_.CurrentTime(); |
| 62 | while (clock_.CurrentTime() - start_time < kDefaultWindow / 2) { |
| 63 | estimator_.OnFrame(clock_.CurrentTime()); |
Danil Chapovalov | 0c626af | 2020-02-10 11:16:00 +0100 | [diff] [blame] | 64 | clock_.AdvanceTime(TimeDelta::Seconds(1) / kLowFps); |
Erik Språng | 7daf550 | 2019-08-14 11:04:40 +0200 | [diff] [blame] | 65 | } |
| 66 | while (clock_.CurrentTime() - start_time < kDefaultWindow) { |
| 67 | estimator_.OnFrame(clock_.CurrentTime()); |
Danil Chapovalov | 0c626af | 2020-02-10 11:16:00 +0100 | [diff] [blame] | 68 | clock_.AdvanceTime(TimeDelta::Seconds(1) / kHighFps); |
Erik Språng | 7daf550 | 2019-08-14 11:04:40 +0200 | [diff] [blame] | 69 | } |
| 70 | |
| 71 | EXPECT_NEAR(*estimator_.GetAverageFps(), kExpectedFps, 0.001); |
| 72 | } |
| 73 | |
| 74 | TEST_F(FrameRateEstimatorTest, CullsOldFramesFromAveragingWindow) { |
| 75 | // Two frames, just on the border of the 1s window => 1 fps. |
| 76 | estimator_.OnFrame(clock_.CurrentTime()); |
| 77 | clock_.AdvanceTime(kDefaultWindow); |
| 78 | estimator_.OnFrame(clock_.CurrentTime()); |
| 79 | EXPECT_TRUE(estimator_.GetAverageFps()); |
| 80 | EXPECT_NEAR(*estimator_.GetAverageFps(), 1.0, 0.001); |
| 81 | |
| 82 | // Oldest frame should just be pushed out the window, leaving a single frame |
| 83 | // => no estimate possible. |
Danil Chapovalov | 0c626af | 2020-02-10 11:16:00 +0100 | [diff] [blame] | 84 | clock_.AdvanceTime(TimeDelta::Micros(1)); |
Erik Språng | 7daf550 | 2019-08-14 11:04:40 +0200 | [diff] [blame] | 85 | EXPECT_FALSE(estimator_.GetAverageFps(clock_.CurrentTime())); |
| 86 | } |
| 87 | |
| 88 | TEST_F(FrameRateEstimatorTest, Reset) { |
| 89 | estimator_.OnFrame(clock_.CurrentTime()); |
Danil Chapovalov | 0c626af | 2020-02-10 11:16:00 +0100 | [diff] [blame] | 90 | clock_.AdvanceTime(TimeDelta::Seconds(1) / 30); |
Erik Språng | 7daf550 | 2019-08-14 11:04:40 +0200 | [diff] [blame] | 91 | estimator_.OnFrame(clock_.CurrentTime()); |
| 92 | EXPECT_TRUE(estimator_.GetAverageFps()); |
| 93 | |
| 94 | // Clear estimator, no estimate should be possible even after inserting one |
| 95 | // new frame. |
| 96 | estimator_.Reset(); |
| 97 | EXPECT_FALSE(estimator_.GetAverageFps()); |
Danil Chapovalov | 0c626af | 2020-02-10 11:16:00 +0100 | [diff] [blame] | 98 | clock_.AdvanceTime(TimeDelta::Seconds(1) / 30); |
Erik Språng | 7daf550 | 2019-08-14 11:04:40 +0200 | [diff] [blame] | 99 | estimator_.OnFrame(clock_.CurrentTime()); |
| 100 | EXPECT_FALSE(estimator_.GetAverageFps()); |
| 101 | } |
| 102 | |
| 103 | } // namespace webrtc |