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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 "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "webrtc/call/mock/mock_rtc_event_log.h"
#include "webrtc/modules/pacing/mock/mock_paced_sender.h"
#include "webrtc/modules/bitrate_controller/include/bitrate_controller.h"
#include "webrtc/modules/congestion_controller/include/congestion_controller.h"
#include "webrtc/modules/congestion_controller/include/mock/mock_congestion_controller.h"
#include "webrtc/modules/remote_bitrate_estimator/include/mock/mock_remote_bitrate_observer.h"
#include "webrtc/system_wrappers/include/clock.h"
using testing::_;
using testing::AtLeast;
using testing::NiceMock;
using testing::Return;
using testing::SaveArg;
using testing::StrictMock;
namespace webrtc {
namespace test {
class CongestionControllerTest : public ::testing::Test {
protected:
CongestionControllerTest() : clock_(123456) {}
~CongestionControllerTest() override {}
void SetUp() override {
pacer_ = new NiceMock<MockPacedSender>();
std::unique_ptr<PacedSender> pacer(pacer_); // Passes ownership.
std::unique_ptr<PacketRouter> packet_router(new PacketRouter());
controller_.reset(new CongestionController(
&clock_, &observer_, &remote_bitrate_observer_, &event_log_,
std::move(packet_router), std::move(pacer)));
bandwidth_observer_.reset(
controller_->GetBitrateController()->CreateRtcpBandwidthObserver());
// Set the initial bitrate estimate and expect the |observer| and |pacer_|
// to be updated.
EXPECT_CALL(observer_, OnNetworkChanged(kInitialBitrateBps, _, _));
EXPECT_CALL(*pacer_, SetEstimatedBitrate(kInitialBitrateBps));
controller_->SetBweBitrates(0, kInitialBitrateBps, 5 * kInitialBitrateBps);
}
SimulatedClock clock_;
StrictMock<MockCongestionObserver> observer_;
NiceMock<MockPacedSender>* pacer_;
NiceMock<MockRemoteBitrateObserver> remote_bitrate_observer_;
NiceMock<MockRtcEventLog> event_log_;
std::unique_ptr<RtcpBandwidthObserver> bandwidth_observer_;
std::unique_ptr<CongestionController> controller_;
const uint32_t kInitialBitrateBps = 60000;
};
TEST_F(CongestionControllerTest, OnNetworkChanged) {
// Test no change.
clock_.AdvanceTimeMilliseconds(25);
controller_->Process();
EXPECT_CALL(observer_, OnNetworkChanged(kInitialBitrateBps * 2, _, _));
EXPECT_CALL(*pacer_, SetEstimatedBitrate(kInitialBitrateBps * 2));
bandwidth_observer_->OnReceivedEstimatedBitrate(kInitialBitrateBps * 2);
clock_.AdvanceTimeMilliseconds(25);
controller_->Process();
EXPECT_CALL(observer_, OnNetworkChanged(kInitialBitrateBps, _, _));
EXPECT_CALL(*pacer_, SetEstimatedBitrate(kInitialBitrateBps));
bandwidth_observer_->OnReceivedEstimatedBitrate(kInitialBitrateBps);
clock_.AdvanceTimeMilliseconds(25);
controller_->Process();
}
TEST_F(CongestionControllerTest, OnSendQueueFull) {
EXPECT_CALL(*pacer_, ExpectedQueueTimeMs())
.WillOnce(Return(PacedSender::kMaxQueueLengthMs + 1));
EXPECT_CALL(observer_, OnNetworkChanged(0, _, _));
controller_->Process();
// Let the pacer not be full next time the controller checks.
EXPECT_CALL(*pacer_, ExpectedQueueTimeMs())
.WillOnce(Return(PacedSender::kMaxQueueLengthMs - 1));
EXPECT_CALL(observer_, OnNetworkChanged(kInitialBitrateBps, _, _));
controller_->Process();
}
TEST_F(CongestionControllerTest, OnSendQueueFullAndEstimateChange) {
EXPECT_CALL(*pacer_, ExpectedQueueTimeMs())
.WillOnce(Return(PacedSender::kMaxQueueLengthMs + 1));
EXPECT_CALL(observer_, OnNetworkChanged(0, _, _));
controller_->Process();
// Receive new estimate but let the queue still be full.
bandwidth_observer_->OnReceivedEstimatedBitrate(kInitialBitrateBps * 2);
EXPECT_CALL(*pacer_, ExpectedQueueTimeMs())
.WillOnce(Return(PacedSender::kMaxQueueLengthMs + 1));
// The send pacer should get the new estimate though.
EXPECT_CALL(*pacer_, SetEstimatedBitrate(kInitialBitrateBps * 2));
clock_.AdvanceTimeMilliseconds(25);
controller_->Process();
// Let the pacer not be full next time the controller checks.
// |OnNetworkChanged| should be called with the new estimate.
EXPECT_CALL(*pacer_, ExpectedQueueTimeMs())
.WillOnce(Return(PacedSender::kMaxQueueLengthMs - 1));
EXPECT_CALL(observer_, OnNetworkChanged(kInitialBitrateBps * 2, _, _));
clock_.AdvanceTimeMilliseconds(25);
controller_->Process();
}
TEST_F(CongestionControllerTest, SignalNetworkState) {
EXPECT_CALL(observer_, OnNetworkChanged(0, _, _));
controller_->SignalNetworkState(kNetworkDown);
EXPECT_CALL(observer_, OnNetworkChanged(kInitialBitrateBps, _, _));
controller_->SignalNetworkState(kNetworkUp);
EXPECT_CALL(observer_, OnNetworkChanged(0, _, _));
controller_->SignalNetworkState(kNetworkDown);
}
TEST_F(CongestionControllerTest, ResetBweAndBitrates) {
int new_bitrate = 200000;
EXPECT_CALL(observer_, OnNetworkChanged(new_bitrate, _, _));
EXPECT_CALL(*pacer_, SetEstimatedBitrate(new_bitrate));
controller_->ResetBweAndBitrates(new_bitrate, -1, -1);
// If the bitrate is reset to -1, the new starting bitrate will be
// the minimum default bitrate 10000bps.
int min_default_bitrate = 10000;
EXPECT_CALL(observer_, OnNetworkChanged(min_default_bitrate, _, _));
EXPECT_CALL(*pacer_, SetEstimatedBitrate(min_default_bitrate));
controller_->ResetBweAndBitrates(-1, -1, -1);
}
TEST_F(CongestionControllerTest,
SignalNetworkStateAndQueueIsFullAndEstimateChange) {
// Send queue is full
EXPECT_CALL(*pacer_, ExpectedQueueTimeMs())
.WillRepeatedly(Return(PacedSender::kMaxQueueLengthMs + 1));
EXPECT_CALL(observer_, OnNetworkChanged(0, _, _));
controller_->Process();
// Queue is full and network is down. Expect no bitrate change.
controller_->SignalNetworkState(kNetworkDown);
controller_->Process();
// Queue is full but network is up. Expect no bitrate change.
controller_->SignalNetworkState(kNetworkUp);
controller_->Process();
// Receive new estimate but let the queue still be full.
EXPECT_CALL(*pacer_, SetEstimatedBitrate(kInitialBitrateBps * 2));
bandwidth_observer_->OnReceivedEstimatedBitrate(kInitialBitrateBps * 2);
clock_.AdvanceTimeMilliseconds(25);
controller_->Process();
// Let the pacer not be full next time the controller checks.
EXPECT_CALL(*pacer_, ExpectedQueueTimeMs())
.WillOnce(Return(PacedSender::kMaxQueueLengthMs - 1));
EXPECT_CALL(observer_, OnNetworkChanged(kInitialBitrateBps * 2, _, _));
controller_->Process();
}
TEST_F(CongestionControllerTest, GetPacerQueuingDelayMs) {
EXPECT_CALL(observer_, OnNetworkChanged(_, _, _)).Times(AtLeast(1));
const int64_t kQueueTimeMs = 123;
EXPECT_CALL(*pacer_, QueueInMs()).WillRepeatedly(Return(kQueueTimeMs));
EXPECT_EQ(kQueueTimeMs, controller_->GetPacerQueuingDelayMs());
// Expect zero pacer delay when network is down.
controller_->SignalNetworkState(kNetworkDown);
EXPECT_EQ(0, controller_->GetPacerQueuingDelayMs());
// Network is up, pacer delay should be reported.
controller_->SignalNetworkState(kNetworkUp);
EXPECT_EQ(kQueueTimeMs, controller_->GetPacerQueuingDelayMs());
}
} // namespace test
} // namespace webrtc