webrtc/modules/audio_coding/audio_network_adaptor/fec_controller_plr_based_unittest.cc - src - Git at Google

 /*
  *  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 <utility>

 #include "webrtc/common_audio/mocks/mock_smoothing_filter.h"
 #include "webrtc/modules/audio_coding/audio_network_adaptor/fec_controller_plr_based.h"
 #include "webrtc/test/gtest.h"

 namespace webrtc {

 using ::testing::NiceMock;
 using ::testing::Return;
 using ::testing::_;

 namespace {

 // The test uses the following settings:
 //
 // packet-loss ^   |  |
 //             |  A| C|   FEC
 //             |    \  \   ON
 //             | FEC \ D\_______
 //             | OFF B\_________
 //             |-----------------> bandwidth
 //
 // A : (kDisablingBandwidthLow, kDisablingPacketLossAtLowBw)
 // B : (kDisablingBandwidthHigh, kDisablingPacketLossAtHighBw)
 // C : (kEnablingBandwidthLow, kEnablingPacketLossAtLowBw)
 // D : (kEnablingBandwidthHigh, kEnablingPacketLossAtHighBw)

 constexpr int kDisablingBandwidthLow = 15000;
 constexpr float kDisablingPacketLossAtLowBw = 0.08f;
 constexpr int kDisablingBandwidthHigh = 64000;
 constexpr float kDisablingPacketLossAtHighBw = 0.01f;
 constexpr int kEnablingBandwidthLow = 17000;
 constexpr float kEnablingPacketLossAtLowBw = 0.1f;
 constexpr int kEnablingBandwidthHigh = 64000;
 constexpr float kEnablingPacketLossAtHighBw = 0.05f;

 struct FecControllerPlrBasedTestStates {
   std::unique_ptr<FecControllerPlrBased> controller;
   MockSmoothingFilter* packet_loss_smoother;
 };

 FecControllerPlrBasedTestStates CreateFecControllerPlrBased(
     bool initial_fec_enabled) {
   FecControllerPlrBasedTestStates states;
   std::unique_ptr<MockSmoothingFilter> mock_smoothing_filter(
       new NiceMock<MockSmoothingFilter>());
   states.packet_loss_smoother = mock_smoothing_filter.get();
   states.controller.reset(new FecControllerPlrBased(
       FecControllerPlrBased::Config(
           initial_fec_enabled,
           ThresholdCurve(kEnablingBandwidthLow, kEnablingPacketLossAtLowBw,
                          kEnablingBandwidthHigh, kEnablingPacketLossAtHighBw),
           ThresholdCurve(kDisablingBandwidthLow, kDisablingPacketLossAtLowBw,
                          kDisablingBandwidthHigh, kDisablingPacketLossAtHighBw),
           0, nullptr),
       std::move(mock_smoothing_filter)));
   return states;
 }

 void UpdateNetworkMetrics(FecControllerPlrBasedTestStates* states,
                           const rtc::Optional<int>& uplink_bandwidth_bps,
                           const rtc::Optional<float>& uplink_packet_loss) {
   // UpdateNetworkMetrics can accept multiple network metric updates at once.
   // However, currently, the most used case is to update one metric at a time.
   // To reflect this fact, we separate the calls.
   if (uplink_bandwidth_bps) {
     Controller::NetworkMetrics network_metrics;
     network_metrics.uplink_bandwidth_bps = uplink_bandwidth_bps;
     states->controller->UpdateNetworkMetrics(network_metrics);
   }
   if (uplink_packet_loss) {
     Controller::NetworkMetrics network_metrics;
     network_metrics.uplink_packet_loss_fraction = uplink_packet_loss;
     EXPECT_CALL(*states->packet_loss_smoother, AddSample(*uplink_packet_loss));
     states->controller->UpdateNetworkMetrics(network_metrics);
     // This is called during CheckDecision().
     EXPECT_CALL(*states->packet_loss_smoother, GetAverage())
         .WillOnce(Return(rtc::Optional<float>(*uplink_packet_loss)));
   }
 }

 // Checks that the FEC decision and |uplink_packet_loss_fraction| given by
 // |states->controller->MakeDecision| matches |expected_enable_fec| and
 // |expected_uplink_packet_loss_fraction|, respectively.
 void CheckDecision(FecControllerPlrBasedTestStates* states,
                    bool expected_enable_fec,
                    float expected_uplink_packet_loss_fraction) {
   AudioEncoderRuntimeConfig config;
   states->controller->MakeDecision(&config);
   EXPECT_EQ(rtc::Optional<bool>(expected_enable_fec), config.enable_fec);
   EXPECT_EQ(rtc::Optional<float>(expected_uplink_packet_loss_fraction),
             config.uplink_packet_loss_fraction);
 }

 }  // namespace

 TEST(FecControllerPlrBasedTest, OutputInitValueWhenUplinkBandwidthUnknown) {
   constexpr bool kInitialFecEnabled = true;
   auto states = CreateFecControllerPlrBased(kInitialFecEnabled);
   // Let uplink packet loss fraction be so low that would cause FEC to turn off
   // if uplink bandwidth was known.
   UpdateNetworkMetrics(&states, rtc::Optional<int>(),
                        rtc::Optional<float>(kDisablingPacketLossAtHighBw));
   CheckDecision(&states, kInitialFecEnabled, kDisablingPacketLossAtHighBw);
 }

 TEST(FecControllerPlrBasedTest,
      OutputInitValueWhenUplinkPacketLossFractionUnknown) {
   constexpr bool kInitialFecEnabled = true;
   auto states = CreateFecControllerPlrBased(kInitialFecEnabled);
   // Let uplink bandwidth be so low that would cause FEC to turn off if uplink
   // bandwidth packet loss fraction was known.
   UpdateNetworkMetrics(&states, rtc::Optional<int>(kDisablingBandwidthLow - 1),
                        rtc::Optional<float>());
   CheckDecision(&states, kInitialFecEnabled, 0.0);
 }

 TEST(FecControllerPlrBasedTest, EnableFecForHighBandwidth) {
   auto states = CreateFecControllerPlrBased(false);
   UpdateNetworkMetrics(&states, rtc::Optional<int>(kEnablingBandwidthHigh),
                        rtc::Optional<float>(kEnablingPacketLossAtHighBw));
   CheckDecision(&states, true, kEnablingPacketLossAtHighBw);
 }

 TEST(FecControllerPlrBasedTest, UpdateMultipleNetworkMetricsAtOnce) {
   // This test is similar to EnableFecForHighBandwidth. But instead of
   // using ::UpdateNetworkMetrics(...), which calls
   // FecControllerPlrBased::UpdateNetworkMetrics(...) multiple times, we
   // we call it only once. This is to verify that
   // FecControllerPlrBased::UpdateNetworkMetrics(...) can handle multiple
   // network updates at once. This is, however, not a common use case in current
   // audio_network_adaptor_impl.cc.
   auto states = CreateFecControllerPlrBased(false);
   Controller::NetworkMetrics network_metrics;
   network_metrics.uplink_bandwidth_bps =
       rtc::Optional<int>(kEnablingBandwidthHigh);
   network_metrics.uplink_packet_loss_fraction =
       rtc::Optional<float>(kEnablingPacketLossAtHighBw);
   EXPECT_CALL(*states.packet_loss_smoother, GetAverage())
       .WillOnce(Return(rtc::Optional<float>(kEnablingPacketLossAtHighBw)));
   states.controller->UpdateNetworkMetrics(network_metrics);
   CheckDecision(&states, true, kEnablingPacketLossAtHighBw);
 }

 TEST(FecControllerPlrBasedTest, MaintainFecOffForHighBandwidth) {
   auto states = CreateFecControllerPlrBased(false);
   constexpr float kPacketLoss = kEnablingPacketLossAtHighBw * 0.99f;
   UpdateNetworkMetrics(&states, rtc::Optional<int>(kEnablingBandwidthHigh),
                        rtc::Optional<float>(kPacketLoss));
   CheckDecision(&states, false, kPacketLoss);
 }

 TEST(FecControllerPlrBasedTest, EnableFecForMediumBandwidth) {
   auto states = CreateFecControllerPlrBased(false);
   constexpr float kPacketLoss =
       (kEnablingPacketLossAtLowBw + kEnablingPacketLossAtHighBw) / 2.0;
   UpdateNetworkMetrics(
       &states,
       rtc::Optional<int>((kEnablingBandwidthHigh + kEnablingBandwidthLow) / 2),
       rtc::Optional<float>(kPacketLoss));
   CheckDecision(&states, true, kPacketLoss);
 }

 TEST(FecControllerPlrBasedTest, MaintainFecOffForMediumBandwidth) {
   auto states = CreateFecControllerPlrBased(false);
   constexpr float kPacketLoss =
       kEnablingPacketLossAtLowBw * 0.49f + kEnablingPacketLossAtHighBw * 0.51f;
   UpdateNetworkMetrics(
       &states,
       rtc::Optional<int>((kEnablingBandwidthHigh + kEnablingBandwidthLow) / 2),
       rtc::Optional<float>(kPacketLoss));
   CheckDecision(&states, false, kPacketLoss);
 }

 TEST(FecControllerPlrBasedTest, EnableFecForLowBandwidth) {
   auto states = CreateFecControllerPlrBased(false);
   UpdateNetworkMetrics(&states, rtc::Optional<int>(kEnablingBandwidthLow),
                        rtc::Optional<float>(kEnablingPacketLossAtLowBw));
   CheckDecision(&states, true, kEnablingPacketLossAtLowBw);
 }

 TEST(FecControllerPlrBasedTest, MaintainFecOffForLowBandwidth) {
   auto states = CreateFecControllerPlrBased(false);
   constexpr float kPacketLoss = kEnablingPacketLossAtLowBw * 0.99f;
   UpdateNetworkMetrics(&states, rtc::Optional<int>(kEnablingBandwidthLow),
                        rtc::Optional<float>(kPacketLoss));
   CheckDecision(&states, false, kPacketLoss);
 }

 TEST(FecControllerPlrBasedTest, MaintainFecOffForVeryLowBandwidth) {
   auto states = CreateFecControllerPlrBased(false);
   // Below |kEnablingBandwidthLow|, no packet loss fraction can cause FEC to
   // turn on.
   UpdateNetworkMetrics(&states, rtc::Optional<int>(kEnablingBandwidthLow - 1),
                        rtc::Optional<float>(1.0));
   CheckDecision(&states, false, 1.0);
 }

 TEST(FecControllerPlrBasedTest, DisableFecForHighBandwidth) {
   auto states = CreateFecControllerPlrBased(true);
   UpdateNetworkMetrics(&states, rtc::Optional<int>(kDisablingBandwidthHigh),
                        rtc::Optional<float>(kDisablingPacketLossAtHighBw));
   CheckDecision(&states, false, kDisablingPacketLossAtHighBw);
 }

 TEST(FecControllerPlrBasedTest, MaintainFecOnForHighBandwidth) {
   auto states = CreateFecControllerPlrBased(true);
   constexpr float kPacketLoss = kDisablingPacketLossAtHighBw * 1.01f;
   UpdateNetworkMetrics(&states, rtc::Optional<int>(kDisablingBandwidthHigh),
                        rtc::Optional<float>(kPacketLoss));
   CheckDecision(&states, true, kPacketLoss);
 }

 TEST(FecControllerPlrBasedTest, DisableFecOnMediumBandwidth) {
   auto states = CreateFecControllerPlrBased(true);
   constexpr float kPacketLoss =
       (kDisablingPacketLossAtLowBw + kDisablingPacketLossAtHighBw) / 2.0f;
   UpdateNetworkMetrics(
       &states,
       rtc::Optional<int>((kDisablingBandwidthHigh + kDisablingBandwidthLow) /
                          2),
       rtc::Optional<float>(kPacketLoss));
   CheckDecision(&states, false, kPacketLoss);
 }

 TEST(FecControllerPlrBasedTest, MaintainFecOnForMediumBandwidth) {
   auto states = CreateFecControllerPlrBased(true);
   constexpr float kPacketLoss = kDisablingPacketLossAtLowBw * 0.51f +
                                 kDisablingPacketLossAtHighBw * 0.49f;
   UpdateNetworkMetrics(
       &states,
       rtc::Optional<int>((kEnablingBandwidthHigh + kDisablingBandwidthLow) / 2),
       rtc::Optional<float>(kPacketLoss));
   CheckDecision(&states, true, kPacketLoss);
 }

 TEST(FecControllerPlrBasedTest, DisableFecForLowBandwidth) {
   auto states = CreateFecControllerPlrBased(true);
   UpdateNetworkMetrics(&states, rtc::Optional<int>(kDisablingBandwidthLow),
                        rtc::Optional<float>(kDisablingPacketLossAtLowBw));
   CheckDecision(&states, false, kDisablingPacketLossAtLowBw);
 }

 TEST(FecControllerPlrBasedTest, DisableFecForVeryLowBandwidth) {
   auto states = CreateFecControllerPlrBased(true);
   // Below |kEnablingBandwidthLow|, any packet loss fraction can cause FEC to
   // turn off.
   UpdateNetworkMetrics(&states, rtc::Optional<int>(kDisablingBandwidthLow - 1),
                        rtc::Optional<float>(1.0));
   CheckDecision(&states, false, 1.0);
 }

 TEST(FecControllerPlrBasedTest, CheckBehaviorOnChangingNetworkMetrics) {
   // In this test, we let the network metrics to traverse from 1 to 5.
   // packet-loss ^ 1 |  |
   //             |   | 2|
   //             |    \  \ 3
   //             |     \4 \_______
   //             |      \_________
   //             |---------5-------> bandwidth

   auto states = CreateFecControllerPlrBased(true);
   UpdateNetworkMetrics(&states, rtc::Optional<int>(kDisablingBandwidthLow - 1),
                        rtc::Optional<float>(1.0));
   CheckDecision(&states, false, 1.0);

   UpdateNetworkMetrics(
       &states, rtc::Optional<int>(kEnablingBandwidthLow),
       rtc::Optional<float>(kEnablingPacketLossAtLowBw * 0.99f));
   CheckDecision(&states, false, kEnablingPacketLossAtLowBw * 0.99f);

   UpdateNetworkMetrics(&states, rtc::Optional<int>(kEnablingBandwidthHigh),
                        rtc::Optional<float>(kEnablingPacketLossAtHighBw));
   CheckDecision(&states, true, kEnablingPacketLossAtHighBw);

   UpdateNetworkMetrics(
       &states, rtc::Optional<int>(kDisablingBandwidthHigh),
       rtc::Optional<float>(kDisablingPacketLossAtHighBw * 1.01f));
   CheckDecision(&states, true, kDisablingPacketLossAtHighBw * 1.01f);

   UpdateNetworkMetrics(&states, rtc::Optional<int>(kDisablingBandwidthHigh + 1),
                        rtc::Optional<float>(0.0));
   CheckDecision(&states, false, 0.0);
 }

 TEST(FecControllerPlrBasedTest, CheckBehaviorOnSpecialCurves) {
   // We test a special configuration, where the points to define the FEC
   // enabling/disabling curves are placed like the following, otherwise the test
   // is the same as CheckBehaviorOnChangingNetworkMetrics.
   //
   // packet-loss ^   |  |
   //             |   | C|
   //             |   |  |
   //             |   | D|_______
   //             |  A|___B______
   //             |-----------------> bandwidth

   constexpr int kEnablingBandwidthHigh = kEnablingBandwidthLow;
   constexpr float kDisablingPacketLossAtLowBw = kDisablingPacketLossAtHighBw;
   FecControllerPlrBasedTestStates states;
   std::unique_ptr<MockSmoothingFilter> mock_smoothing_filter(
       new NiceMock<MockSmoothingFilter>());
   states.packet_loss_smoother = mock_smoothing_filter.get();
   states.controller.reset(new FecControllerPlrBased(
       FecControllerPlrBased::Config(
           true,
           ThresholdCurve(kEnablingBandwidthLow, kEnablingPacketLossAtLowBw,
                          kEnablingBandwidthHigh, kEnablingPacketLossAtHighBw),
           ThresholdCurve(kDisablingBandwidthLow, kDisablingPacketLossAtLowBw,
                          kDisablingBandwidthHigh, kDisablingPacketLossAtHighBw),
           0, nullptr),
       std::move(mock_smoothing_filter)));

   UpdateNetworkMetrics(&states, rtc::Optional<int>(kDisablingBandwidthLow - 1),
                        rtc::Optional<float>(1.0));
   CheckDecision(&states, false, 1.0);

   UpdateNetworkMetrics(
       &states, rtc::Optional<int>(kEnablingBandwidthLow),
       rtc::Optional<float>(kEnablingPacketLossAtHighBw * 0.99f));
   CheckDecision(&states, false, kEnablingPacketLossAtHighBw * 0.99f);

   UpdateNetworkMetrics(&states, rtc::Optional<int>(kEnablingBandwidthHigh),
                        rtc::Optional<float>(kEnablingPacketLossAtHighBw));
   CheckDecision(&states, true, kEnablingPacketLossAtHighBw);

   UpdateNetworkMetrics(
       &states, rtc::Optional<int>(kDisablingBandwidthHigh),
       rtc::Optional<float>(kDisablingPacketLossAtHighBw * 1.01f));
   CheckDecision(&states, true, kDisablingPacketLossAtHighBw * 1.01f);

   UpdateNetworkMetrics(&states, rtc::Optional<int>(kDisablingBandwidthHigh + 1),
                        rtc::Optional<float>(0.0));
   CheckDecision(&states, false, 0.0);
 }

 #if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
 TEST(FecControllerPlrBasedDeathTest, InvalidConfig) {
   FecControllerPlrBasedTestStates states;
   std::unique_ptr<MockSmoothingFilter> mock_smoothing_filter(
       new NiceMock<MockSmoothingFilter>());
   states.packet_loss_smoother = mock_smoothing_filter.get();
   EXPECT_DEATH(
       states.controller.reset(new FecControllerPlrBased(
           FecControllerPlrBased::Config(
               true,
               ThresholdCurve(kDisablingBandwidthLow - 1,
                              kEnablingPacketLossAtLowBw, kEnablingBandwidthHigh,
                              kEnablingPacketLossAtHighBw),
               ThresholdCurve(
                   kDisablingBandwidthLow, kDisablingPacketLossAtLowBw,
                   kDisablingBandwidthHigh, kDisablingPacketLossAtHighBw),
               0, nullptr),
           std::move(mock_smoothing_filter))),
       "Check failed");
 }
 #endif

 }  // namespace webrtc
	/*
	* 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 <utility>

	#include "webrtc/common_audio/mocks/mock_smoothing_filter.h"
	#include "webrtc/modules/audio_coding/audio_network_adaptor/fec_controller_plr_based.h"
	#include "webrtc/test/gtest.h"

	namespace webrtc {

	using ::testing::NiceMock;
	using ::testing::Return;
	using ::testing::_;

	namespace {

	// The test uses the following settings:
	//
	// packet-loss ^ \| \|
	// \| A\| C\| FEC
	// \| \ \ ON
	// \| FEC \ D\_______
	// \| OFF B\_________
	// \|-----------------> bandwidth
	//
	// A : (kDisablingBandwidthLow, kDisablingPacketLossAtLowBw)
	// B : (kDisablingBandwidthHigh, kDisablingPacketLossAtHighBw)
	// C : (kEnablingBandwidthLow, kEnablingPacketLossAtLowBw)
	// D : (kEnablingBandwidthHigh, kEnablingPacketLossAtHighBw)

	constexpr int kDisablingBandwidthLow = 15000;
	constexpr float kDisablingPacketLossAtLowBw = 0.08f;
	constexpr int kDisablingBandwidthHigh = 64000;
	constexpr float kDisablingPacketLossAtHighBw = 0.01f;
	constexpr int kEnablingBandwidthLow = 17000;
	constexpr float kEnablingPacketLossAtLowBw = 0.1f;
	constexpr int kEnablingBandwidthHigh = 64000;
	constexpr float kEnablingPacketLossAtHighBw = 0.05f;

	struct FecControllerPlrBasedTestStates {
	std::unique_ptr<FecControllerPlrBased> controller;
	MockSmoothingFilter* packet_loss_smoother;
	};

	FecControllerPlrBasedTestStates CreateFecControllerPlrBased(
	bool initial_fec_enabled) {
	FecControllerPlrBasedTestStates states;
	std::unique_ptr<MockSmoothingFilter> mock_smoothing_filter(
	new NiceMock<MockSmoothingFilter>());
	states.packet_loss_smoother = mock_smoothing_filter.get();
	states.controller.reset(new FecControllerPlrBased(
	FecControllerPlrBased::Config(
	initial_fec_enabled,
	ThresholdCurve(kEnablingBandwidthLow, kEnablingPacketLossAtLowBw,
	kEnablingBandwidthHigh, kEnablingPacketLossAtHighBw),
	ThresholdCurve(kDisablingBandwidthLow, kDisablingPacketLossAtLowBw,
	kDisablingBandwidthHigh, kDisablingPacketLossAtHighBw),
	0, nullptr),
	std::move(mock_smoothing_filter)));
	return states;
	}

	void UpdateNetworkMetrics(FecControllerPlrBasedTestStates* states,
	const rtc::Optional<int>& uplink_bandwidth_bps,
	const rtc::Optional<float>& uplink_packet_loss) {
	// UpdateNetworkMetrics can accept multiple network metric updates at once.
	// However, currently, the most used case is to update one metric at a time.
	// To reflect this fact, we separate the calls.
	if (uplink_bandwidth_bps) {
	Controller::NetworkMetrics network_metrics;
	network_metrics.uplink_bandwidth_bps = uplink_bandwidth_bps;
	states->controller->UpdateNetworkMetrics(network_metrics);
	}
	if (uplink_packet_loss) {
	Controller::NetworkMetrics network_metrics;
	network_metrics.uplink_packet_loss_fraction = uplink_packet_loss;
	EXPECT_CALL(states->packet_loss_smoother, AddSample(uplink_packet_loss));
	states->controller->UpdateNetworkMetrics(network_metrics);
	// This is called during CheckDecision().
	EXPECT_CALL(*states->packet_loss_smoother, GetAverage())
	.WillOnce(Return(rtc::Optional<float>(*uplink_packet_loss)));
	}
	}

	// Checks that the FEC decision and \|uplink_packet_loss_fraction\| given by
	// \|states->controller->MakeDecision\| matches \|expected_enable_fec\| and
	// \|expected_uplink_packet_loss_fraction\|, respectively.
	void CheckDecision(FecControllerPlrBasedTestStates* states,
	bool expected_enable_fec,
	float expected_uplink_packet_loss_fraction) {
	AudioEncoderRuntimeConfig config;
	states->controller->MakeDecision(&config);
	EXPECT_EQ(rtc::Optional<bool>(expected_enable_fec), config.enable_fec);
	EXPECT_EQ(rtc::Optional<float>(expected_uplink_packet_loss_fraction),
	config.uplink_packet_loss_fraction);
	}

	} // namespace

	TEST(FecControllerPlrBasedTest, OutputInitValueWhenUplinkBandwidthUnknown) {
	constexpr bool kInitialFecEnabled = true;
	auto states = CreateFecControllerPlrBased(kInitialFecEnabled);
	// Let uplink packet loss fraction be so low that would cause FEC to turn off
	// if uplink bandwidth was known.
	UpdateNetworkMetrics(&states, rtc::Optional<int>(),
	rtc::Optional<float>(kDisablingPacketLossAtHighBw));
	CheckDecision(&states, kInitialFecEnabled, kDisablingPacketLossAtHighBw);
	}

	TEST(FecControllerPlrBasedTest,
	OutputInitValueWhenUplinkPacketLossFractionUnknown) {
	constexpr bool kInitialFecEnabled = true;
	auto states = CreateFecControllerPlrBased(kInitialFecEnabled);
	// Let uplink bandwidth be so low that would cause FEC to turn off if uplink
	// bandwidth packet loss fraction was known.
	UpdateNetworkMetrics(&states, rtc::Optional<int>(kDisablingBandwidthLow - 1),
	rtc::Optional<float>());
	CheckDecision(&states, kInitialFecEnabled, 0.0);
	}

	TEST(FecControllerPlrBasedTest, EnableFecForHighBandwidth) {
	auto states = CreateFecControllerPlrBased(false);
	UpdateNetworkMetrics(&states, rtc::Optional<int>(kEnablingBandwidthHigh),
	rtc::Optional<float>(kEnablingPacketLossAtHighBw));
	CheckDecision(&states, true, kEnablingPacketLossAtHighBw);
	}

	TEST(FecControllerPlrBasedTest, UpdateMultipleNetworkMetricsAtOnce) {
	// This test is similar to EnableFecForHighBandwidth. But instead of
	// using ::UpdateNetworkMetrics(...), which calls
	// FecControllerPlrBased::UpdateNetworkMetrics(...) multiple times, we
	// we call it only once. This is to verify that
	// FecControllerPlrBased::UpdateNetworkMetrics(...) can handle multiple
	// network updates at once. This is, however, not a common use case in current
	// audio_network_adaptor_impl.cc.
	auto states = CreateFecControllerPlrBased(false);
	Controller::NetworkMetrics network_metrics;
	network_metrics.uplink_bandwidth_bps =
	rtc::Optional<int>(kEnablingBandwidthHigh);
	network_metrics.uplink_packet_loss_fraction =
	rtc::Optional<float>(kEnablingPacketLossAtHighBw);
	EXPECT_CALL(*states.packet_loss_smoother, GetAverage())
	.WillOnce(Return(rtc::Optional<float>(kEnablingPacketLossAtHighBw)));
	states.controller->UpdateNetworkMetrics(network_metrics);
	CheckDecision(&states, true, kEnablingPacketLossAtHighBw);
	}

	TEST(FecControllerPlrBasedTest, MaintainFecOffForHighBandwidth) {
	auto states = CreateFecControllerPlrBased(false);
	constexpr float kPacketLoss = kEnablingPacketLossAtHighBw * 0.99f;
	UpdateNetworkMetrics(&states, rtc::Optional<int>(kEnablingBandwidthHigh),
	rtc::Optional<float>(kPacketLoss));
	CheckDecision(&states, false, kPacketLoss);
	}

	TEST(FecControllerPlrBasedTest, EnableFecForMediumBandwidth) {
	auto states = CreateFecControllerPlrBased(false);
	constexpr float kPacketLoss =
	(kEnablingPacketLossAtLowBw + kEnablingPacketLossAtHighBw) / 2.0;
	UpdateNetworkMetrics(
	&states,
	rtc::Optional<int>((kEnablingBandwidthHigh + kEnablingBandwidthLow) / 2),
	rtc::Optional<float>(kPacketLoss));
	CheckDecision(&states, true, kPacketLoss);
	}

	TEST(FecControllerPlrBasedTest, MaintainFecOffForMediumBandwidth) {
	auto states = CreateFecControllerPlrBased(false);
	constexpr float kPacketLoss =
	kEnablingPacketLossAtLowBw * 0.49f + kEnablingPacketLossAtHighBw * 0.51f;
	UpdateNetworkMetrics(
	&states,
	rtc::Optional<int>((kEnablingBandwidthHigh + kEnablingBandwidthLow) / 2),
	rtc::Optional<float>(kPacketLoss));
	CheckDecision(&states, false, kPacketLoss);
	}

	TEST(FecControllerPlrBasedTest, EnableFecForLowBandwidth) {
	auto states = CreateFecControllerPlrBased(false);
	UpdateNetworkMetrics(&states, rtc::Optional<int>(kEnablingBandwidthLow),
	rtc::Optional<float>(kEnablingPacketLossAtLowBw));
	CheckDecision(&states, true, kEnablingPacketLossAtLowBw);
	}

	TEST(FecControllerPlrBasedTest, MaintainFecOffForLowBandwidth) {
	auto states = CreateFecControllerPlrBased(false);
	constexpr float kPacketLoss = kEnablingPacketLossAtLowBw * 0.99f;
	UpdateNetworkMetrics(&states, rtc::Optional<int>(kEnablingBandwidthLow),
	rtc::Optional<float>(kPacketLoss));
	CheckDecision(&states, false, kPacketLoss);
	}

	TEST(FecControllerPlrBasedTest, MaintainFecOffForVeryLowBandwidth) {
	auto states = CreateFecControllerPlrBased(false);
	// Below \|kEnablingBandwidthLow\|, no packet loss fraction can cause FEC to
	// turn on.
	UpdateNetworkMetrics(&states, rtc::Optional<int>(kEnablingBandwidthLow - 1),
	rtc::Optional<float>(1.0));
	CheckDecision(&states, false, 1.0);
	}

	TEST(FecControllerPlrBasedTest, DisableFecForHighBandwidth) {
	auto states = CreateFecControllerPlrBased(true);
	UpdateNetworkMetrics(&states, rtc::Optional<int>(kDisablingBandwidthHigh),
	rtc::Optional<float>(kDisablingPacketLossAtHighBw));
	CheckDecision(&states, false, kDisablingPacketLossAtHighBw);
	}

	TEST(FecControllerPlrBasedTest, MaintainFecOnForHighBandwidth) {
	auto states = CreateFecControllerPlrBased(true);
	constexpr float kPacketLoss = kDisablingPacketLossAtHighBw * 1.01f;
	UpdateNetworkMetrics(&states, rtc::Optional<int>(kDisablingBandwidthHigh),
	rtc::Optional<float>(kPacketLoss));
	CheckDecision(&states, true, kPacketLoss);
	}

	TEST(FecControllerPlrBasedTest, DisableFecOnMediumBandwidth) {
	auto states = CreateFecControllerPlrBased(true);
	constexpr float kPacketLoss =
	(kDisablingPacketLossAtLowBw + kDisablingPacketLossAtHighBw) / 2.0f;
	UpdateNetworkMetrics(
	&states,
	rtc::Optional<int>((kDisablingBandwidthHigh + kDisablingBandwidthLow) /
	2),
	rtc::Optional<float>(kPacketLoss));
	CheckDecision(&states, false, kPacketLoss);
	}

	TEST(FecControllerPlrBasedTest, MaintainFecOnForMediumBandwidth) {
	auto states = CreateFecControllerPlrBased(true);
	constexpr float kPacketLoss = kDisablingPacketLossAtLowBw * 0.51f +
	kDisablingPacketLossAtHighBw * 0.49f;
	UpdateNetworkMetrics(
	&states,
	rtc::Optional<int>((kEnablingBandwidthHigh + kDisablingBandwidthLow) / 2),
	rtc::Optional<float>(kPacketLoss));
	CheckDecision(&states, true, kPacketLoss);
	}

	TEST(FecControllerPlrBasedTest, DisableFecForLowBandwidth) {
	auto states = CreateFecControllerPlrBased(true);
	UpdateNetworkMetrics(&states, rtc::Optional<int>(kDisablingBandwidthLow),
	rtc::Optional<float>(kDisablingPacketLossAtLowBw));
	CheckDecision(&states, false, kDisablingPacketLossAtLowBw);
	}

	TEST(FecControllerPlrBasedTest, DisableFecForVeryLowBandwidth) {
	auto states = CreateFecControllerPlrBased(true);
	// Below \|kEnablingBandwidthLow\|, any packet loss fraction can cause FEC to
	// turn off.
	UpdateNetworkMetrics(&states, rtc::Optional<int>(kDisablingBandwidthLow - 1),
	rtc::Optional<float>(1.0));
	CheckDecision(&states, false, 1.0);
	}

	TEST(FecControllerPlrBasedTest, CheckBehaviorOnChangingNetworkMetrics) {
	// In this test, we let the network metrics to traverse from 1 to 5.
	// packet-loss ^ 1 \| \|
	// \| \| 2\|
	// \| \ \ 3
	// \| \4 \_______
	// \| \_________
	// \|---------5-------> bandwidth

	auto states = CreateFecControllerPlrBased(true);
	UpdateNetworkMetrics(&states, rtc::Optional<int>(kDisablingBandwidthLow - 1),
	rtc::Optional<float>(1.0));
	CheckDecision(&states, false, 1.0);

	UpdateNetworkMetrics(
	&states, rtc::Optional<int>(kEnablingBandwidthLow),
	rtc::Optional<float>(kEnablingPacketLossAtLowBw * 0.99f));
	CheckDecision(&states, false, kEnablingPacketLossAtLowBw * 0.99f);

	UpdateNetworkMetrics(&states, rtc::Optional<int>(kEnablingBandwidthHigh),
	rtc::Optional<float>(kEnablingPacketLossAtHighBw));
	CheckDecision(&states, true, kEnablingPacketLossAtHighBw);

	UpdateNetworkMetrics(
	&states, rtc::Optional<int>(kDisablingBandwidthHigh),
	rtc::Optional<float>(kDisablingPacketLossAtHighBw * 1.01f));
	CheckDecision(&states, true, kDisablingPacketLossAtHighBw * 1.01f);

	UpdateNetworkMetrics(&states, rtc::Optional<int>(kDisablingBandwidthHigh + 1),
	rtc::Optional<float>(0.0));
	CheckDecision(&states, false, 0.0);
	}

	TEST(FecControllerPlrBasedTest, CheckBehaviorOnSpecialCurves) {
	// We test a special configuration, where the points to define the FEC
	// enabling/disabling curves are placed like the following, otherwise the test
	// is the same as CheckBehaviorOnChangingNetworkMetrics.
	//
	// packet-loss ^ \| \|
	// \| \| C\|
	// \| \| \|
	// \| \| D\|_______
	// \| A\|___B______
	// \|-----------------> bandwidth

	constexpr int kEnablingBandwidthHigh = kEnablingBandwidthLow;
	constexpr float kDisablingPacketLossAtLowBw = kDisablingPacketLossAtHighBw;
	FecControllerPlrBasedTestStates states;
	std::unique_ptr<MockSmoothingFilter> mock_smoothing_filter(
	new NiceMock<MockSmoothingFilter>());
	states.packet_loss_smoother = mock_smoothing_filter.get();
	states.controller.reset(new FecControllerPlrBased(
	FecControllerPlrBased::Config(
	true,
	ThresholdCurve(kEnablingBandwidthLow, kEnablingPacketLossAtLowBw,
	kEnablingBandwidthHigh, kEnablingPacketLossAtHighBw),
	ThresholdCurve(kDisablingBandwidthLow, kDisablingPacketLossAtLowBw,
	kDisablingBandwidthHigh, kDisablingPacketLossAtHighBw),
	0, nullptr),
	std::move(mock_smoothing_filter)));

	UpdateNetworkMetrics(&states, rtc::Optional<int>(kDisablingBandwidthLow - 1),
	rtc::Optional<float>(1.0));
	CheckDecision(&states, false, 1.0);

	UpdateNetworkMetrics(
	&states, rtc::Optional<int>(kEnablingBandwidthLow),
	rtc::Optional<float>(kEnablingPacketLossAtHighBw * 0.99f));
	CheckDecision(&states, false, kEnablingPacketLossAtHighBw * 0.99f);

	UpdateNetworkMetrics(&states, rtc::Optional<int>(kEnablingBandwidthHigh),
	rtc::Optional<float>(kEnablingPacketLossAtHighBw));
	CheckDecision(&states, true, kEnablingPacketLossAtHighBw);

	UpdateNetworkMetrics(
	&states, rtc::Optional<int>(kDisablingBandwidthHigh),
	rtc::Optional<float>(kDisablingPacketLossAtHighBw * 1.01f));
	CheckDecision(&states, true, kDisablingPacketLossAtHighBw * 1.01f);

	UpdateNetworkMetrics(&states, rtc::Optional<int>(kDisablingBandwidthHigh + 1),
	rtc::Optional<float>(0.0));
	CheckDecision(&states, false, 0.0);
	}

	#if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
	TEST(FecControllerPlrBasedDeathTest, InvalidConfig) {
	FecControllerPlrBasedTestStates states;
	std::unique_ptr<MockSmoothingFilter> mock_smoothing_filter(
	new NiceMock<MockSmoothingFilter>());
	states.packet_loss_smoother = mock_smoothing_filter.get();
	EXPECT_DEATH(
	states.controller.reset(new FecControllerPlrBased(
	FecControllerPlrBased::Config(
	true,
	ThresholdCurve(kDisablingBandwidthLow - 1,
	kEnablingPacketLossAtLowBw, kEnablingBandwidthHigh,
	kEnablingPacketLossAtHighBw),
	ThresholdCurve(
	kDisablingBandwidthLow, kDisablingPacketLossAtLowBw,
	kDisablingBandwidthHigh, kDisablingPacketLossAtHighBw),
	0, nullptr),
	std::move(mock_smoothing_filter))),
	"Check failed");
	}
	#endif

	} // namespace webrtc