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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/protocol/capture_scheduler.h"
#include <stddef.h>
#include <array>
#include <memory>
#include <utility>
#include "base/functional/bind.h"
#include "base/memory/ptr_util.h"
#include "base/memory/raw_ptr.h"
#include "base/test/simple_test_tick_clock.h"
#include "base/test/task_environment.h"
#include "base/timer/mock_timer.h"
#include "remoting/proto/video.pb.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace remoting::protocol {
constexpr auto kTestInputs =
std::to_array<int>({100, 50, 30, 20, 10, 30, 60, 80});
static const int kMinumumFrameIntervalMs = 50;
class CaptureSchedulerTest : public testing::Test {
public:
CaptureSchedulerTest() : capture_called_(false) {}
void InitScheduler() {
scheduler_ = std::make_unique<CaptureScheduler>(base::BindRepeating(
&CaptureSchedulerTest::DoCapture, base::Unretained(this)));
scheduler_->set_minimum_interval(
base::Milliseconds(kMinumumFrameIntervalMs));
scheduler_->SetTickClockForTest(&tick_clock_);
capture_timer_ = new base::MockOneShotTimer();
scheduler_->SetTimerForTest(base::WrapUnique(capture_timer_.get()));
scheduler_->Start();
}
void DoCapture() { capture_called_ = true; }
void CheckCaptureCalled() {
EXPECT_TRUE(capture_called_);
capture_called_ = false;
}
void SimulateSingleFrameCapture(
base::TimeDelta capture_delay,
base::TimeDelta encode_delay,
base::TimeDelta expected_delay_between_frames) {
capture_timer_->Fire();
CheckCaptureCalled();
tick_clock_.Advance(capture_delay);
scheduler_->OnCaptureCompleted();
VideoPacket packet;
packet.set_encode_time_ms(encode_delay.InMilliseconds());
scheduler_->OnFrameEncoded(&packet);
scheduler_->OnFrameSent();
std::unique_ptr<VideoAck> ack(new VideoAck());
ack->set_frame_id(packet.frame_id());
scheduler_->ProcessVideoAck(std::move(ack));
EXPECT_TRUE(capture_timer_->IsRunning());
EXPECT_EQ(std::max(base::TimeDelta(),
expected_delay_between_frames - capture_delay),
capture_timer_->GetCurrentDelay());
}
protected:
base::test::SingleThreadTaskEnvironment task_environment_;
std::unique_ptr<CaptureScheduler> scheduler_;
base::SimpleTestTickClock tick_clock_;
// Owned by |scheduler_|.
raw_ptr<base::MockOneShotTimer, DanglingUntriaged> capture_timer_;
bool capture_called_;
};
TEST_F(CaptureSchedulerTest, SingleSampleSameTimes) {
const auto kTestResults =
std::to_array<std::array<const int, std::size(kTestInputs)>>({
{400, 200, 120, 80, 50, 120, 240, 320}, // One core.
{200, 100, 60, 50, 50, 60, 120, 160}, // Two cores.
{100, 50, 50, 50, 50, 50, 60, 80}, // Four cores.
{50, 50, 50, 50, 50, 50, 50, 50}, // Eight cores.
});
for (size_t i = 0; i < std::size(kTestResults); ++i) {
for (size_t j = 0; j < std::size(kTestInputs); ++j) {
InitScheduler();
scheduler_->SetNumOfProcessorsForTest(1 << i);
SimulateSingleFrameCapture(base::Milliseconds(kTestInputs[j]),
base::Milliseconds(kTestInputs[j]),
base::Milliseconds(kTestResults[i][j]));
}
}
}
TEST_F(CaptureSchedulerTest, SingleSampleDifferentTimes) {
const auto kTestResults =
std::to_array<std::array<const int, std::size(kTestInputs)>>({
{360, 220, 120, 60, 60, 120, 220, 360}, // One core.
{180, 110, 60, 50, 50, 60, 110, 180}, // Two cores.
{90, 55, 50, 50, 50, 50, 55, 90}, // Four cores.
{50, 50, 50, 50, 50, 50, 50, 50}, // Eight cores.
});
for (size_t i = 0; i < std::size(kTestResults); ++i) {
for (size_t j = 0; j < std::size(kTestInputs); ++j) {
InitScheduler();
scheduler_->SetNumOfProcessorsForTest(1 << i);
SimulateSingleFrameCapture(
base::Milliseconds(kTestInputs[j]),
base::Milliseconds(kTestInputs[std::size(kTestInputs) - 1 - j]),
base::Milliseconds(kTestResults[i][j]));
}
}
}
TEST_F(CaptureSchedulerTest, RollingAverageDifferentTimes) {
const auto kTestResults =
std::to_array<std::array<const double, std::size(kTestInputs)>>({
{360, 290, 233.333, 133.333, 80, 80, 133.333, 233.333}, // One core.
{180, 145, 116.666, 66.666, 50, 50, 66.666, 116.666}, // Two cores.
{90, 72.5, 58.333, 50, 50, 50, 50, 58.333}, // Four cores.
{50, 50, 50, 50, 50, 50, 50, 50}, // Eight cores.
});
for (size_t i = 0; i < std::size(kTestResults); ++i) {
InitScheduler();
scheduler_->SetNumOfProcessorsForTest(1 << i);
for (size_t j = 0; j < std::size(kTestInputs); ++j) {
SimulateSingleFrameCapture(
base::Milliseconds(kTestInputs[j]),
base::Milliseconds(kTestInputs[std::size(kTestInputs) - 1 - j]),
base::Milliseconds(kTestResults[i][j]));
}
}
}
// Verify that we never have more than 2 encoding frames.
TEST_F(CaptureSchedulerTest, MaximumEncodingFrames) {
InitScheduler();
// Process the first frame to let the scheduler know that receiver supports
// ACKs.
SimulateSingleFrameCapture(base::TimeDelta(), base::TimeDelta(),
base::Milliseconds(kMinumumFrameIntervalMs));
capture_timer_->Fire();
CheckCaptureCalled();
scheduler_->OnCaptureCompleted();
capture_timer_->Fire();
CheckCaptureCalled();
scheduler_->OnCaptureCompleted();
EXPECT_FALSE(capture_timer_->IsRunning());
VideoPacket packet;
scheduler_->OnFrameEncoded(&packet);
EXPECT_TRUE(capture_timer_->IsRunning());
}
// Verify that the scheduler doesn't exceed maximum number of pending frames.
TEST_F(CaptureSchedulerTest, MaximumPendingFrames) {
InitScheduler();
// Process the first frame to let the scheduler know that receiver supports
// ACKs.
SimulateSingleFrameCapture(base::TimeDelta(), base::TimeDelta(),
base::Milliseconds(kMinumumFrameIntervalMs));
// Queue some frames until the sender is blocked.
while (capture_timer_->IsRunning()) {
capture_timer_->Fire();
CheckCaptureCalled();
scheduler_->OnCaptureCompleted();
VideoPacket packet;
scheduler_->OnFrameEncoded(&packet);
scheduler_->OnFrameSent();
}
// Next frame should be scheduled, once one of the queued frames is
// acknowledged.
EXPECT_FALSE(capture_timer_->IsRunning());
scheduler_->ProcessVideoAck(base::WrapUnique(new VideoAck()));
EXPECT_TRUE(capture_timer_->IsRunning());
}
} // namespace remoting::protocol
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