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/*
* Copyright (c) 2014 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 "modules/video_coding/utility/quality_scaler.h"
#include <memory>
#include <string>
#include "api/field_trials_view.h"
#include "api/units/time_delta.h"
#include "rtc_base/checks.h"
#include "rtc_base/event.h"
#include "rtc_base/task_queue_for_test.h"
#include "test/gtest.h"
#include "test/scoped_key_value_config.h"
namespace webrtc {
namespace {
static const int kFramerate = 30;
static const int kLowQp = 15;
static const int kHighQp = 40;
static const int kMinFramesNeededToScale = 60; // From quality_scaler.cc.
static constexpr TimeDelta kDefaultTimeout = TimeDelta::Millis(150);
} // namespace
class FakeQpUsageHandler : public QualityScalerQpUsageHandlerInterface {
public:
~FakeQpUsageHandler() override = default;
// QualityScalerQpUsageHandlerInterface implementation.
void OnReportQpUsageHigh() override {
adapt_down_events_++;
event.Set();
}
void OnReportQpUsageLow() override {
adapt_up_events_++;
event.Set();
}
rtc::Event event;
int adapt_up_events_ = 0;
int adapt_down_events_ = 0;
};
// Pass a lower sampling period to speed up the tests.
class QualityScalerUnderTest : public QualityScaler {
public:
explicit QualityScalerUnderTest(QualityScalerQpUsageHandlerInterface* handler,
VideoEncoder::QpThresholds thresholds,
const FieldTrialsView& field_trials)
: QualityScaler(handler, thresholds, field_trials, 5) {}
};
class QualityScalerTest : public ::testing::Test,
public ::testing::WithParamInterface<std::string> {
protected:
enum ScaleDirection {
kKeepScaleAboveLowQp,
kKeepScaleAtHighQp,
kScaleDown,
kScaleDownAboveHighQp,
kScaleUp
};
QualityScalerTest()
: scoped_field_trial_(GetParam()),
task_queue_("QualityScalerTestQueue"),
handler_(std::make_unique<FakeQpUsageHandler>()) {
task_queue_.SendTask([this] {
qs_ = std::unique_ptr<QualityScaler>(new QualityScalerUnderTest(
handler_.get(), VideoEncoder::QpThresholds(kLowQp, kHighQp),
scoped_field_trial_));
});
}
~QualityScalerTest() override {
task_queue_.SendTask([this] { qs_ = nullptr; });
}
void TriggerScale(ScaleDirection scale_direction) {
for (int i = 0; i < kFramerate * 5; ++i) {
switch (scale_direction) {
case kKeepScaleAboveLowQp:
qs_->ReportQp(kLowQp + 1, 0);
break;
case kScaleUp:
qs_->ReportQp(kLowQp, 0);
break;
case kScaleDown:
qs_->ReportDroppedFrameByMediaOpt();
break;
case kKeepScaleAtHighQp:
qs_->ReportQp(kHighQp, 0);
break;
case kScaleDownAboveHighQp:
qs_->ReportQp(kHighQp + 1, 0);
break;
}
}
}
test::ScopedKeyValueConfig scoped_field_trial_;
TaskQueueForTest task_queue_;
std::unique_ptr<QualityScaler> qs_;
std::unique_ptr<FakeQpUsageHandler> handler_;
};
INSTANTIATE_TEST_SUITE_P(
FieldTrials,
QualityScalerTest,
::testing::Values(
"WebRTC-Video-QualityScaling/Enabled-1,2,3,4,5,6,7,8,0.9,0.99,1/",
"WebRTC-Video-QualityScaling/Disabled/"));
TEST_P(QualityScalerTest, DownscalesAfterContinuousFramedrop) {
task_queue_.SendTask([this] { TriggerScale(kScaleDown); });
EXPECT_TRUE(handler_->event.Wait(kDefaultTimeout));
EXPECT_EQ(1, handler_->adapt_down_events_);
EXPECT_EQ(0, handler_->adapt_up_events_);
}
TEST_P(QualityScalerTest, KeepsScaleAtHighQp) {
task_queue_.SendTask([this] { TriggerScale(kKeepScaleAtHighQp); });
EXPECT_FALSE(handler_->event.Wait(kDefaultTimeout));
EXPECT_EQ(0, handler_->adapt_down_events_);
EXPECT_EQ(0, handler_->adapt_up_events_);
}
TEST_P(QualityScalerTest, DownscalesAboveHighQp) {
task_queue_.SendTask([this] { TriggerScale(kScaleDownAboveHighQp); });
EXPECT_TRUE(handler_->event.Wait(kDefaultTimeout));
EXPECT_EQ(1, handler_->adapt_down_events_);
EXPECT_EQ(0, handler_->adapt_up_events_);
}
TEST_P(QualityScalerTest, DownscalesAfterTwoThirdsFramedrop) {
task_queue_.SendTask([this] {
for (int i = 0; i < kFramerate * 5; ++i) {
qs_->ReportDroppedFrameByMediaOpt();
qs_->ReportDroppedFrameByMediaOpt();
qs_->ReportQp(kHighQp, 0);
}
});
EXPECT_TRUE(handler_->event.Wait(kDefaultTimeout));
EXPECT_EQ(1, handler_->adapt_down_events_);
EXPECT_EQ(0, handler_->adapt_up_events_);
}
TEST_P(QualityScalerTest, DoesNotDownscaleAfterHalfFramedrop) {
task_queue_.SendTask([this] {
for (int i = 0; i < kFramerate * 5; ++i) {
qs_->ReportDroppedFrameByMediaOpt();
qs_->ReportQp(kHighQp, 0);
}
});
EXPECT_FALSE(handler_->event.Wait(kDefaultTimeout));
EXPECT_EQ(0, handler_->adapt_down_events_);
EXPECT_EQ(0, handler_->adapt_up_events_);
}
TEST_P(QualityScalerTest, DownscalesAfterTwoThirdsIfFieldTrialEnabled) {
const bool kDownScaleExpected =
GetParam().find("Enabled") != std::string::npos;
task_queue_.SendTask([this] {
for (int i = 0; i < kFramerate * 5; ++i) {
qs_->ReportDroppedFrameByMediaOpt();
qs_->ReportDroppedFrameByEncoder();
qs_->ReportQp(kHighQp, 0);
}
});
EXPECT_EQ(kDownScaleExpected, handler_->event.Wait(kDefaultTimeout));
EXPECT_EQ(kDownScaleExpected ? 1 : 0, handler_->adapt_down_events_);
EXPECT_EQ(0, handler_->adapt_up_events_);
}
TEST_P(QualityScalerTest, KeepsScaleOnNormalQp) {
task_queue_.SendTask([this] { TriggerScale(kKeepScaleAboveLowQp); });
EXPECT_FALSE(handler_->event.Wait(kDefaultTimeout));
EXPECT_EQ(0, handler_->adapt_down_events_);
EXPECT_EQ(0, handler_->adapt_up_events_);
}
TEST_P(QualityScalerTest, UpscalesAfterLowQp) {
task_queue_.SendTask([this] { TriggerScale(kScaleUp); });
EXPECT_TRUE(handler_->event.Wait(kDefaultTimeout));
EXPECT_EQ(0, handler_->adapt_down_events_);
EXPECT_EQ(1, handler_->adapt_up_events_);
}
TEST_P(QualityScalerTest, ScalesDownAndBackUp) {
task_queue_.SendTask([this] { TriggerScale(kScaleDown); });
EXPECT_TRUE(handler_->event.Wait(kDefaultTimeout));
EXPECT_EQ(1, handler_->adapt_down_events_);
EXPECT_EQ(0, handler_->adapt_up_events_);
task_queue_.SendTask([this] { TriggerScale(kScaleUp); });
EXPECT_TRUE(handler_->event.Wait(kDefaultTimeout));
EXPECT_EQ(1, handler_->adapt_down_events_);
EXPECT_EQ(1, handler_->adapt_up_events_);
}
TEST_P(QualityScalerTest, DoesNotScaleUntilEnoughFramesObserved) {
task_queue_.SendTask([this] {
// Not enough frames to make a decision.
for (int i = 0; i < kMinFramesNeededToScale - 1; ++i) {
qs_->ReportQp(kLowQp, 0);
}
});
EXPECT_FALSE(handler_->event.Wait(kDefaultTimeout));
task_queue_.SendTask([this] {
// Send 1 more. Enough frames observed, should result in an adapt
// request.
qs_->ReportQp(kLowQp, 0);
});
EXPECT_TRUE(handler_->event.Wait(kDefaultTimeout));
EXPECT_EQ(0, handler_->adapt_down_events_);
EXPECT_EQ(1, handler_->adapt_up_events_);
// Samples should be cleared after an adapt request.
task_queue_.SendTask([this] {
// Not enough frames to make a decision.
qs_->ReportQp(kLowQp, 0);
});
EXPECT_FALSE(handler_->event.Wait(kDefaultTimeout));
EXPECT_EQ(0, handler_->adapt_down_events_);
EXPECT_EQ(1, handler_->adapt_up_events_);
}
TEST_P(QualityScalerTest, ScalesDownAndBackUpWithMinFramesNeeded) {
task_queue_.SendTask([this] {
for (int i = 0; i < kMinFramesNeededToScale; ++i) {
qs_->ReportQp(kHighQp + 1, 0);
}
});
EXPECT_TRUE(handler_->event.Wait(kDefaultTimeout));
EXPECT_EQ(1, handler_->adapt_down_events_);
EXPECT_EQ(0, handler_->adapt_up_events_);
// Samples cleared.
task_queue_.SendTask([this] {
for (int i = 0; i < kMinFramesNeededToScale; ++i) {
qs_->ReportQp(kLowQp, 0);
}
});
EXPECT_TRUE(handler_->event.Wait(kDefaultTimeout));
EXPECT_EQ(1, handler_->adapt_down_events_);
EXPECT_EQ(1, handler_->adapt_up_events_);
}
} // namespace webrtc