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/*
* Copyright (c) 2016 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 <memory>
#include "modules/congestion_controller/probe_controller.h"
#include "modules/pacing/mock/mock_paced_sender.h"
#include "rtc_base/logging.h"
#include "system_wrappers/include/clock.h"
#include "test/gmock.h"
#include "test/gtest.h"
using testing::_;
using testing::AtLeast;
using testing::NiceMock;
using testing::Return;
namespace webrtc {
namespace test {
namespace {
constexpr int kMinBitrateBps = 100;
constexpr int kStartBitrateBps = 300;
constexpr int kMaxBitrateBps = 10000;
constexpr int kExponentialProbingTimeoutMs = 5000;
constexpr int kAlrProbeInterval = 5000;
constexpr int kAlrEndedTimeoutMs = 3000;
constexpr int kBitrateDropTimeoutMs = 5000;
} // namespace
class ProbeControllerTest : public ::testing::Test {
protected:
ProbeControllerTest() : clock_(100000000L) {
probe_controller_.reset(new ProbeController(&pacer_, &clock_));
}
~ProbeControllerTest() override {}
SimulatedClock clock_;
NiceMock<MockPacedSender> pacer_;
std::unique_ptr<ProbeController> probe_controller_;
};
TEST_F(ProbeControllerTest, InitiatesProbingAtStart) {
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(AtLeast(2));
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
}
TEST_F(ProbeControllerTest, ProbeOnlyWhenNetworkIsUp) {
probe_controller_->OnNetworkStateChanged(kNetworkDown);
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(0);
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
testing::Mock::VerifyAndClearExpectations(&pacer_);
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(AtLeast(2));
probe_controller_->OnNetworkStateChanged(kNetworkUp);
}
TEST_F(ProbeControllerTest, InitiatesProbingOnMaxBitrateIncrease) {
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(AtLeast(2));
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
// Long enough to time out exponential probing.
clock_.AdvanceTimeMilliseconds(kExponentialProbingTimeoutMs);
probe_controller_->SetEstimatedBitrate(kStartBitrateBps);
probe_controller_->Process();
EXPECT_CALL(pacer_, CreateProbeCluster(kMaxBitrateBps + 100));
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps + 100);
}
TEST_F(ProbeControllerTest, InitiatesProbingOnMaxBitrateIncreaseAtMaxBitrate) {
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(AtLeast(2));
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
// Long enough to time out exponential probing.
clock_.AdvanceTimeMilliseconds(kExponentialProbingTimeoutMs);
probe_controller_->SetEstimatedBitrate(kStartBitrateBps);
probe_controller_->Process();
probe_controller_->SetEstimatedBitrate(kMaxBitrateBps);
EXPECT_CALL(pacer_, CreateProbeCluster(kMaxBitrateBps + 100));
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps + 100);
}
TEST_F(ProbeControllerTest, TestExponentialProbing) {
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
// Repeated probe should only be sent when estimated bitrate climbs above
// 0.7 * 6 * kStartBitrateBps = 1260.
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(0);
probe_controller_->SetEstimatedBitrate(1000);
testing::Mock::VerifyAndClearExpectations(&pacer_);
EXPECT_CALL(pacer_, CreateProbeCluster(2 * 1800));
probe_controller_->SetEstimatedBitrate(1800);
}
TEST_F(ProbeControllerTest, TestExponentialProbingTimeout) {
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
// Advance far enough to cause a time out in waiting for probing result.
clock_.AdvanceTimeMilliseconds(kExponentialProbingTimeoutMs);
probe_controller_->Process();
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(0);
probe_controller_->SetEstimatedBitrate(1800);
}
TEST_F(ProbeControllerTest, RequestProbeInAlr) {
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(2);
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
probe_controller_->SetEstimatedBitrate(500);
testing::Mock::VerifyAndClearExpectations(&pacer_);
EXPECT_CALL(pacer_, CreateProbeCluster(0.85 * 500)).Times(1);
EXPECT_CALL(pacer_, GetApplicationLimitedRegionStartTime())
.WillRepeatedly(
Return(rtc::Optional<int64_t>(clock_.TimeInMilliseconds())));
clock_.AdvanceTimeMilliseconds(kAlrProbeInterval + 1);
probe_controller_->Process();
probe_controller_->SetEstimatedBitrate(250);
probe_controller_->RequestProbe();
}
TEST_F(ProbeControllerTest, RequestProbeWhenAlrEndedRecently) {
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(2);
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
probe_controller_->SetEstimatedBitrate(500);
testing::Mock::VerifyAndClearExpectations(&pacer_);
EXPECT_CALL(pacer_, CreateProbeCluster(0.85 * 500)).Times(1);
EXPECT_CALL(pacer_, GetApplicationLimitedRegionStartTime())
.WillRepeatedly(Return(rtc::Optional<int64_t>()));
clock_.AdvanceTimeMilliseconds(kAlrProbeInterval + 1);
probe_controller_->Process();
probe_controller_->SetEstimatedBitrate(250);
probe_controller_->SetAlrEndedTimeMs(clock_.TimeInMilliseconds());
clock_.AdvanceTimeMilliseconds(kAlrEndedTimeoutMs - 1);
probe_controller_->RequestProbe();
}
TEST_F(ProbeControllerTest, RequestProbeWhenAlrNotEndedRecently) {
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(2);
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
probe_controller_->SetEstimatedBitrate(500);
testing::Mock::VerifyAndClearExpectations(&pacer_);
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(0);
EXPECT_CALL(pacer_, GetApplicationLimitedRegionStartTime())
.WillRepeatedly(Return(rtc::Optional<int64_t>()));
clock_.AdvanceTimeMilliseconds(kAlrProbeInterval + 1);
probe_controller_->Process();
probe_controller_->SetEstimatedBitrate(250);
probe_controller_->SetAlrEndedTimeMs(clock_.TimeInMilliseconds());
clock_.AdvanceTimeMilliseconds(kAlrEndedTimeoutMs + 1);
probe_controller_->RequestProbe();
}
TEST_F(ProbeControllerTest, RequestProbeWhenBweDropNotRecent) {
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(2);
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
probe_controller_->SetEstimatedBitrate(500);
testing::Mock::VerifyAndClearExpectations(&pacer_);
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(0);
EXPECT_CALL(pacer_, GetApplicationLimitedRegionStartTime())
.WillRepeatedly(
Return(rtc::Optional<int64_t>(clock_.TimeInMilliseconds())));
clock_.AdvanceTimeMilliseconds(kAlrProbeInterval + 1);
probe_controller_->Process();
probe_controller_->SetEstimatedBitrate(250);
clock_.AdvanceTimeMilliseconds(kBitrateDropTimeoutMs + 1);
probe_controller_->RequestProbe();
}
TEST_F(ProbeControllerTest, PeriodicProbing) {
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(2);
probe_controller_->EnablePeriodicAlrProbing(true);
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
probe_controller_->SetEstimatedBitrate(500);
testing::Mock::VerifyAndClearExpectations(&pacer_);
int64_t start_time = clock_.TimeInMilliseconds();
// Expect the controller to send a new probe after 5s has passed.
EXPECT_CALL(pacer_, CreateProbeCluster(1000)).Times(1);
EXPECT_CALL(pacer_, GetApplicationLimitedRegionStartTime())
.WillRepeatedly(Return(rtc::Optional<int64_t>(start_time)));
clock_.AdvanceTimeMilliseconds(5000);
probe_controller_->Process();
probe_controller_->SetEstimatedBitrate(500);
testing::Mock::VerifyAndClearExpectations(&pacer_);
// The following probe should be sent at 10s into ALR.
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(0);
EXPECT_CALL(pacer_, GetApplicationLimitedRegionStartTime())
.WillRepeatedly(Return(rtc::Optional<int64_t>(start_time)));
clock_.AdvanceTimeMilliseconds(4000);
probe_controller_->Process();
probe_controller_->SetEstimatedBitrate(500);
testing::Mock::VerifyAndClearExpectations(&pacer_);
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(1);
EXPECT_CALL(pacer_, GetApplicationLimitedRegionStartTime())
.WillRepeatedly(Return(rtc::Optional<int64_t>(start_time)));
clock_.AdvanceTimeMilliseconds(1000);
probe_controller_->Process();
probe_controller_->SetEstimatedBitrate(500);
testing::Mock::VerifyAndClearExpectations(&pacer_);
}
TEST_F(ProbeControllerTest, PeriodicProbingAfterReset) {
testing::StrictMock<MockPacedSender> local_pacer;
probe_controller_.reset(new ProbeController(&local_pacer, &clock_));
int64_t alr_start_time = clock_.TimeInMilliseconds();
EXPECT_CALL(local_pacer, GetApplicationLimitedRegionStartTime())
.WillRepeatedly(
Return(rtc::Optional<int64_t>(alr_start_time)));
EXPECT_CALL(local_pacer, CreateProbeCluster(_)).Times(2);
probe_controller_->EnablePeriodicAlrProbing(true);
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
probe_controller_->Reset();
clock_.AdvanceTimeMilliseconds(10000);
probe_controller_->Process();
EXPECT_CALL(local_pacer, CreateProbeCluster(_)).Times(2);
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
// Make sure we use |kStartBitrateBps| as the estimated bitrate
// until SetEstimatedBitrate is called with an updated estimate.
clock_.AdvanceTimeMilliseconds(10000);
EXPECT_CALL(local_pacer, CreateProbeCluster(kStartBitrateBps*2));
probe_controller_->Process();
}
TEST_F(ProbeControllerTest, TestExponentialProbingOverflow) {
const int64_t kMbpsMultiplier = 1000000;
probe_controller_->SetBitrates(kMinBitrateBps, 10 * kMbpsMultiplier,
100 * kMbpsMultiplier);
// Verify that probe bitrate is capped at the specified max bitrate
EXPECT_CALL(pacer_, CreateProbeCluster(100 * kMbpsMultiplier));
probe_controller_->SetEstimatedBitrate(60 * kMbpsMultiplier);
testing::Mock::VerifyAndClearExpectations(&pacer_);
// Verify that repeated probes aren't sent.
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(0);
probe_controller_->SetEstimatedBitrate(100 * kMbpsMultiplier);
}
} // namespace test
} // namespace webrtc