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/*
* Copyright 2021 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/framerate_controller.h"
#include <limits>
#include "rtc_base/time_utils.h"
#include "test/gtest.h"
namespace webrtc {
namespace {
constexpr int kInputFps = 30;
constexpr int kNumFrames = 60;
} // namespace
class FramerateControllerTest : public ::testing::Test {
protected:
int64_t GetNextTimestampNs() {
int64_t interval_us = rtc::kNumMicrosecsPerSec / kInputFps;
next_timestamp_us_ += interval_us;
return next_timestamp_us_ * rtc::kNumNanosecsPerMicrosec;
}
int64_t next_timestamp_us_ = rtc::TimeMicros();
FramerateController controller_;
};
TEST_F(FramerateControllerTest, NoFramesDroppedIfNothingRequested) {
// Default max framerate is maxdouble.
for (int i = 1; i < kNumFrames; ++i)
EXPECT_FALSE(controller_.ShouldDropFrame(GetNextTimestampNs()));
}
TEST_F(FramerateControllerTest, AllFramesDroppedIfZeroRequested) {
controller_.SetMaxFramerate(0);
for (int i = 1; i < kNumFrames; ++i)
EXPECT_TRUE(controller_.ShouldDropFrame(GetNextTimestampNs()));
}
TEST_F(FramerateControllerTest, AllFramesDroppedIfNegativeRequested) {
controller_.SetMaxFramerate(-1);
for (int i = 1; i < kNumFrames; ++i)
EXPECT_TRUE(controller_.ShouldDropFrame(GetNextTimestampNs()));
}
TEST_F(FramerateControllerTest, EverySecondFrameDroppedIfHalfRequested) {
controller_.SetMaxFramerate(kInputFps / 2);
// The first frame should not be dropped.
for (int i = 1; i < kNumFrames; ++i)
EXPECT_EQ(i % 2 == 0, controller_.ShouldDropFrame(GetNextTimestampNs()));
}
TEST_F(FramerateControllerTest, EveryThirdFrameDroppedIfTwoThirdsRequested) {
controller_.SetMaxFramerate(kInputFps * 2 / 3);
// The first frame should not be dropped.
for (int i = 1; i < kNumFrames; ++i)
EXPECT_EQ(i % 3 == 0, controller_.ShouldDropFrame(GetNextTimestampNs()));
}
TEST_F(FramerateControllerTest, NoFrameDroppedIfTwiceRequested) {
controller_.SetMaxFramerate(kInputFps * 2);
for (int i = 1; i < kNumFrames; ++i)
EXPECT_FALSE(controller_.ShouldDropFrame(GetNextTimestampNs()));
}
TEST_F(FramerateControllerTest, TestAverageFramerate) {
const double kMaxFps = 18.2;
controller_.SetMaxFramerate(kMaxFps);
const int kNumSec = 10;
int frames_kept = 0;
for (int i = 0; i < kInputFps * kNumSec; ++i) {
if (!controller_.ShouldDropFrame(GetNextTimestampNs()))
++frames_kept;
}
double average_fps = static_cast<double>(frames_kept) / kNumSec;
EXPECT_NEAR(kMaxFps, average_fps, 0.01);
}
TEST_F(FramerateControllerTest, NoFrameDroppedForLargeTimestampOffset) {
controller_.SetMaxFramerate(kInputFps);
EXPECT_FALSE(controller_.ShouldDropFrame(0));
const int64_t kLargeOffsetNs = -987654321LL * 1000;
EXPECT_FALSE(controller_.ShouldDropFrame(kLargeOffsetNs));
int64_t input_interval_ns = rtc::kNumNanosecsPerSec / kInputFps;
EXPECT_FALSE(controller_.ShouldDropFrame(kLargeOffsetNs + input_interval_ns));
}
TEST_F(FramerateControllerTest, NoFrameDroppedIfInputWithJitterRequested) {
controller_.SetMaxFramerate(kInputFps);
// Input fps with jitter.
int64_t input_interval_ns = rtc::kNumNanosecsPerSec / kInputFps;
EXPECT_FALSE(controller_.ShouldDropFrame(input_interval_ns * 0 / 10));
EXPECT_FALSE(controller_.ShouldDropFrame(input_interval_ns * 10 / 10 - 1));
EXPECT_FALSE(controller_.ShouldDropFrame(input_interval_ns * 25 / 10));
EXPECT_FALSE(controller_.ShouldDropFrame(input_interval_ns * 30 / 10));
EXPECT_FALSE(controller_.ShouldDropFrame(input_interval_ns * 35 / 10));
EXPECT_FALSE(controller_.ShouldDropFrame(input_interval_ns * 50 / 10));
}
TEST_F(FramerateControllerTest, FrameDroppedWhenReductionRequested) {
controller_.SetMaxFramerate(kInputFps);
// Expect no frame drop.
for (int i = 1; i < kNumFrames; ++i)
EXPECT_FALSE(controller_.ShouldDropFrame(GetNextTimestampNs()));
// Reduce max frame rate.
controller_.SetMaxFramerate(kInputFps / 2);
// Verify that every other frame is dropped.
for (int i = 1; i < kNumFrames; ++i)
EXPECT_EQ(i % 2 == 0, controller_.ShouldDropFrame(GetNextTimestampNs()));
}
TEST_F(FramerateControllerTest, NoFramesDroppedAfterReset) {
controller_.SetMaxFramerate(0);
// All frames dropped.
for (int i = 1; i < kNumFrames; ++i)
EXPECT_TRUE(controller_.ShouldDropFrame(GetNextTimestampNs()));
controller_.Reset();
// Expect no frame drop after reset.
for (int i = 1; i < kNumFrames; ++i)
EXPECT_FALSE(controller_.ShouldDropFrame(GetNextTimestampNs()));
}
TEST_F(FramerateControllerTest, TestKeepFrame) {
FramerateController controller(kInputFps / 2);
EXPECT_FALSE(controller.ShouldDropFrame(GetNextTimestampNs()));
EXPECT_TRUE(controller.ShouldDropFrame(GetNextTimestampNs()));
EXPECT_FALSE(controller.ShouldDropFrame(GetNextTimestampNs()));
EXPECT_TRUE(controller.ShouldDropFrame(GetNextTimestampNs()));
EXPECT_FALSE(controller.ShouldDropFrame(GetNextTimestampNs()));
// Next frame should be dropped.
// Keep this frame (e.g. in case of a key frame).
controller.KeepFrame(GetNextTimestampNs());
// Expect next frame to be dropped instead.
EXPECT_TRUE(controller.ShouldDropFrame(GetNextTimestampNs()));
}
} // namespace webrtc
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