| /* |
| * Copyright 2021 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/congestion_controller/goog_cc/loss_based_bwe_v2.h" |
| |
| #include <string> |
| #include <vector> |
| |
| #include "api/transport/network_types.h" |
| #include "api/units/data_rate.h" |
| #include "api/units/data_size.h" |
| #include "api/units/time_delta.h" |
| #include "api/units/timestamp.h" |
| #include "rtc_base/strings/string_builder.h" |
| #include "test/explicit_key_value_config.h" |
| #include "test/gtest.h" |
| |
| namespace webrtc { |
| |
| namespace { |
| |
| using ::webrtc::test::ExplicitKeyValueConfig; |
| |
| constexpr TimeDelta kObservationDurationLowerBound = TimeDelta::Millis(250); |
| constexpr TimeDelta kDelayedIncreaseWindow = TimeDelta::Millis(300); |
| constexpr double kMaxIncreaseFactor = 1.5; |
| constexpr int kPacketSize = 15'000; |
| |
| class LossBasedBweV2Test : public ::testing::TestWithParam<bool> { |
| protected: |
| std::string Config(bool enabled, bool valid) { |
| char buffer[1024]; |
| rtc::SimpleStringBuilder config_string(buffer); |
| |
| config_string << "WebRTC-Bwe-LossBasedBweV2/"; |
| |
| if (enabled) { |
| config_string << "Enabled:true"; |
| } else { |
| config_string << "Enabled:false"; |
| } |
| |
| if (valid) { |
| config_string << ",BwRampupUpperBoundFactor:1.2"; |
| } else { |
| config_string << ",BwRampupUpperBoundFactor:0.0"; |
| } |
| config_string |
| << ",CandidateFactors:1.1|1.0|0.95,HigherBwBiasFactor:0.01," |
| "InherentLossLowerBound:0.001,InherentLossUpperBoundBwBalance:" |
| "14kbps," |
| "InherentLossUpperBoundOffset:0.9,InitialInherentLossEstimate:0.01," |
| "NewtonIterations:2,NewtonStepSize:0.4,ObservationWindowSize:15," |
| "SendingRateSmoothingFactor:0.01," |
| "InstantUpperBoundTemporalWeightFactor:0.97," |
| "InstantUpperBoundBwBalance:90kbps," |
| "InstantUpperBoundLossOffset:0.1,TemporalWeightFactor:0.98," |
| "MinNumObservations:1"; |
| |
| config_string.AppendFormat( |
| ",ObservationDurationLowerBound:%dms", |
| static_cast<int>(kObservationDurationLowerBound.ms())); |
| config_string.AppendFormat(",MaxIncreaseFactor:%f", kMaxIncreaseFactor); |
| config_string.AppendFormat(",DelayedIncreaseWindow:%dms", |
| static_cast<int>(kDelayedIncreaseWindow.ms())); |
| |
| config_string << "/"; |
| |
| return config_string.str(); |
| } |
| |
| std::string ShortObservationConfig(std::string custom_config) { |
| char buffer[1024]; |
| rtc::SimpleStringBuilder config_string(buffer); |
| |
| config_string << "WebRTC-Bwe-LossBasedBweV2/" |
| "MinNumObservations:1,ObservationWindowSize:2,"; |
| config_string << custom_config; |
| config_string << "/"; |
| |
| return config_string.str(); |
| } |
| |
| std::vector<PacketResult> CreatePacketResultsWithReceivedPackets( |
| Timestamp first_packet_timestamp) { |
| std::vector<PacketResult> enough_feedback(2); |
| enough_feedback[0].sent_packet.size = DataSize::Bytes(kPacketSize); |
| enough_feedback[1].sent_packet.size = DataSize::Bytes(kPacketSize); |
| enough_feedback[0].sent_packet.send_time = first_packet_timestamp; |
| enough_feedback[1].sent_packet.send_time = |
| first_packet_timestamp + kObservationDurationLowerBound; |
| enough_feedback[0].receive_time = |
| first_packet_timestamp + kObservationDurationLowerBound; |
| enough_feedback[1].receive_time = |
| first_packet_timestamp + 2 * kObservationDurationLowerBound; |
| return enough_feedback; |
| } |
| |
| std::vector<PacketResult> CreatePacketResultsWith10pPacketLossRate( |
| Timestamp first_packet_timestamp, |
| DataSize lost_packet_size = DataSize::Bytes(kPacketSize)) { |
| std::vector<PacketResult> enough_feedback(10); |
| enough_feedback[0].sent_packet.size = DataSize::Bytes(kPacketSize); |
| for (unsigned i = 0; i < enough_feedback.size(); ++i) { |
| enough_feedback[i].sent_packet.size = DataSize::Bytes(kPacketSize); |
| enough_feedback[i].sent_packet.send_time = |
| first_packet_timestamp + |
| static_cast<int>(i) * kObservationDurationLowerBound; |
| enough_feedback[i].receive_time = |
| first_packet_timestamp + |
| static_cast<int>(i + 1) * kObservationDurationLowerBound; |
| } |
| enough_feedback[9].receive_time = Timestamp::PlusInfinity(); |
| enough_feedback[9].sent_packet.size = lost_packet_size; |
| return enough_feedback; |
| } |
| |
| std::vector<PacketResult> CreatePacketResultsWith50pPacketLossRate( |
| Timestamp first_packet_timestamp) { |
| std::vector<PacketResult> enough_feedback(2); |
| enough_feedback[0].sent_packet.size = DataSize::Bytes(kPacketSize); |
| enough_feedback[1].sent_packet.size = DataSize::Bytes(kPacketSize); |
| enough_feedback[0].sent_packet.send_time = first_packet_timestamp; |
| enough_feedback[1].sent_packet.send_time = |
| first_packet_timestamp + kObservationDurationLowerBound; |
| enough_feedback[0].receive_time = |
| first_packet_timestamp + kObservationDurationLowerBound; |
| enough_feedback[1].receive_time = Timestamp::PlusInfinity(); |
| return enough_feedback; |
| } |
| |
| std::vector<PacketResult> CreatePacketResultsWith100pLossRate( |
| Timestamp first_packet_timestamp) { |
| std::vector<PacketResult> enough_feedback(2); |
| enough_feedback[0].sent_packet.size = DataSize::Bytes(kPacketSize); |
| enough_feedback[1].sent_packet.size = DataSize::Bytes(kPacketSize); |
| enough_feedback[0].sent_packet.send_time = first_packet_timestamp; |
| enough_feedback[1].sent_packet.send_time = |
| first_packet_timestamp + kObservationDurationLowerBound; |
| enough_feedback[0].receive_time = Timestamp::PlusInfinity(); |
| enough_feedback[1].receive_time = Timestamp::PlusInfinity(); |
| return enough_feedback; |
| } |
| }; |
| |
| TEST_F(LossBasedBweV2Test, EnabledWhenGivenValidConfigurationValues) { |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/true, /*valid=*/true)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| |
| EXPECT_TRUE(loss_based_bandwidth_estimator.IsEnabled()); |
| } |
| |
| TEST_F(LossBasedBweV2Test, DisabledWhenGivenDisabledConfiguration) { |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/false, /*valid=*/true)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| |
| EXPECT_FALSE(loss_based_bandwidth_estimator.IsEnabled()); |
| } |
| |
| TEST_F(LossBasedBweV2Test, DisabledWhenGivenNonValidConfigurationValues) { |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/true, /*valid=*/false)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| |
| EXPECT_FALSE(loss_based_bandwidth_estimator.IsEnabled()); |
| } |
| |
| TEST_F(LossBasedBweV2Test, DisabledWhenGivenNonPositiveCandidateFactor) { |
| ExplicitKeyValueConfig key_value_config_negative_candidate_factor( |
| "WebRTC-Bwe-LossBasedBweV2/CandidateFactors:-1.3|1.1/"); |
| LossBasedBweV2 loss_based_bandwidth_estimator_1( |
| &key_value_config_negative_candidate_factor); |
| EXPECT_FALSE(loss_based_bandwidth_estimator_1.IsEnabled()); |
| |
| ExplicitKeyValueConfig key_value_config_zero_candidate_factor( |
| "WebRTC-Bwe-LossBasedBweV2/CandidateFactors:0.0|1.1/"); |
| LossBasedBweV2 loss_based_bandwidth_estimator_2( |
| &key_value_config_zero_candidate_factor); |
| EXPECT_FALSE(loss_based_bandwidth_estimator_2.IsEnabled()); |
| } |
| |
| TEST_F(LossBasedBweV2Test, |
| DisabledWhenGivenConfigurationThatDoesNotAllowGeneratingCandidates) { |
| ExplicitKeyValueConfig key_value_config( |
| "WebRTC-Bwe-LossBasedBweV2/" |
| "CandidateFactors:1.0,AckedRateCandidate:false," |
| "DelayBasedCandidate:false/"); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| EXPECT_FALSE(loss_based_bandwidth_estimator.IsEnabled()); |
| } |
| |
| TEST_F(LossBasedBweV2Test, ReturnsDelayBasedEstimateWhenDisabled) { |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/false, /*valid=*/true)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| /*packet_results=*/{}, |
| /*delay_based_estimate=*/DataRate::KilobitsPerSec(100), |
| |
| /*in_alr=*/false); |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(100)); |
| } |
| |
| TEST_F(LossBasedBweV2Test, |
| ReturnsDelayBasedEstimateWhenWhenGivenNonValidConfigurationValues) { |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/true, /*valid=*/false)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| /*packet_results=*/{}, |
| /*delay_based_estimate=*/DataRate::KilobitsPerSec(100), |
| |
| /*in_alr=*/false); |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(100)); |
| } |
| |
| TEST_F(LossBasedBweV2Test, |
| BandwidthEstimateGivenInitializationAndThenFeedback) { |
| std::vector<PacketResult> enough_feedback = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/true, /*valid=*/true)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| |
| /*in_alr=*/false); |
| |
| EXPECT_TRUE(loss_based_bandwidth_estimator.IsReady()); |
| EXPECT_TRUE(loss_based_bandwidth_estimator.GetLossBasedResult() |
| .bandwidth_estimate.IsFinite()); |
| } |
| |
| TEST_F(LossBasedBweV2Test, NoBandwidthEstimateGivenNoInitialization) { |
| std::vector<PacketResult> enough_feedback = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/true, /*valid=*/true)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| |
| /*in_alr=*/false); |
| |
| EXPECT_FALSE(loss_based_bandwidth_estimator.IsReady()); |
| EXPECT_TRUE(loss_based_bandwidth_estimator.GetLossBasedResult() |
| .bandwidth_estimate.IsPlusInfinity()); |
| } |
| |
| TEST_F(LossBasedBweV2Test, NoBandwidthEstimateGivenNotEnoughFeedback) { |
| // Create packet results where the observation duration is less than the lower |
| // bound. |
| PacketResult not_enough_feedback[2]; |
| not_enough_feedback[0].sent_packet.size = DataSize::Bytes(15'000); |
| not_enough_feedback[1].sent_packet.size = DataSize::Bytes(15'000); |
| not_enough_feedback[0].sent_packet.send_time = Timestamp::Zero(); |
| not_enough_feedback[1].sent_packet.send_time = |
| Timestamp::Zero() + kObservationDurationLowerBound / 2; |
| not_enough_feedback[0].receive_time = |
| Timestamp::Zero() + kObservationDurationLowerBound / 2; |
| not_enough_feedback[1].receive_time = |
| Timestamp::Zero() + kObservationDurationLowerBound; |
| |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/true, /*valid=*/true)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| |
| EXPECT_FALSE(loss_based_bandwidth_estimator.IsReady()); |
| EXPECT_TRUE(loss_based_bandwidth_estimator.GetLossBasedResult() |
| .bandwidth_estimate.IsPlusInfinity()); |
| |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| not_enough_feedback, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| |
| /*in_alr=*/false); |
| |
| EXPECT_FALSE(loss_based_bandwidth_estimator.IsReady()); |
| EXPECT_TRUE(loss_based_bandwidth_estimator.GetLossBasedResult() |
| .bandwidth_estimate.IsPlusInfinity()); |
| } |
| |
| TEST_F(LossBasedBweV2Test, |
| SetValueIsTheEstimateUntilAdditionalFeedbackHasBeenReceived) { |
| std::vector<PacketResult> enough_feedback_1 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| std::vector<PacketResult> enough_feedback_2 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| 2 * kObservationDurationLowerBound); |
| |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/true, /*valid=*/true)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_1, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| |
| /*in_alr=*/false); |
| |
| EXPECT_NE( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(600)); |
| |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(600)); |
| |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_2, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| |
| /*in_alr=*/false); |
| |
| EXPECT_NE( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(600)); |
| } |
| |
| TEST_F(LossBasedBweV2Test, |
| SetAcknowledgedBitrateOnlyAffectsTheBweWhenAdditionalFeedbackIsGiven) { |
| std::vector<PacketResult> enough_feedback_1 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| std::vector<PacketResult> enough_feedback_2 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| 2 * kObservationDurationLowerBound); |
| |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/true, /*valid=*/true)); |
| LossBasedBweV2 loss_based_bandwidth_estimator_1(&key_value_config); |
| LossBasedBweV2 loss_based_bandwidth_estimator_2(&key_value_config); |
| |
| loss_based_bandwidth_estimator_1.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator_2.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator_1.UpdateBandwidthEstimate( |
| enough_feedback_1, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| |
| /*in_alr=*/false); |
| loss_based_bandwidth_estimator_2.UpdateBandwidthEstimate( |
| enough_feedback_1, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| |
| /*in_alr=*/false); |
| |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator_1.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(660)); |
| |
| loss_based_bandwidth_estimator_1.SetAcknowledgedBitrate( |
| DataRate::KilobitsPerSec(900)); |
| |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator_1.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(660)); |
| |
| loss_based_bandwidth_estimator_1.UpdateBandwidthEstimate( |
| enough_feedback_2, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| |
| /*in_alr=*/false); |
| loss_based_bandwidth_estimator_2.UpdateBandwidthEstimate( |
| enough_feedback_2, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| |
| /*in_alr=*/false); |
| |
| EXPECT_NE( |
| loss_based_bandwidth_estimator_1.GetLossBasedResult().bandwidth_estimate, |
| loss_based_bandwidth_estimator_2.GetLossBasedResult().bandwidth_estimate); |
| } |
| |
| TEST_F(LossBasedBweV2Test, |
| BandwidthEstimateIsCappedToBeTcpFairGivenTooHighLossRate) { |
| std::vector<PacketResult> enough_feedback_no_received_packets = |
| CreatePacketResultsWith100pLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/true, /*valid=*/true)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_no_received_packets, |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(100)); |
| } |
| |
| // When network is normal, estimate can increase but never be higher than |
| // the delay based estimate. |
| TEST_F(LossBasedBweV2Test, |
| BandwidthEstimateCappedByDelayBasedEstimateWhenNetworkNormal) { |
| // Create two packet results, network is in normal state, 100% packets are |
| // received, and no delay increase. |
| std::vector<PacketResult> enough_feedback_1 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| std::vector<PacketResult> enough_feedback_2 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| 2 * kObservationDurationLowerBound); |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/true, /*valid=*/true)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_1, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| |
| /*in_alr=*/false); |
| // If the delay based estimate is infinity, then loss based estimate increases |
| // and not bounded by delay based estimate. |
| EXPECT_GT( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_2, /*delay_based_estimate=*/DataRate::KilobitsPerSec(500), |
| |
| /*in_alr=*/false); |
| // If the delay based estimate is not infinity, then loss based estimate is |
| // bounded by delay based estimate. |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(500)); |
| } |
| |
| // When loss based bwe receives a strong signal of overusing and an increase in |
| // loss rate, it should acked bitrate for emegency backoff. |
| TEST_F(LossBasedBweV2Test, UseAckedBitrateForEmegencyBackOff) { |
| // Create two packet results, first packet has 50% loss rate, second packet |
| // has 100% loss rate. |
| std::vector<PacketResult> enough_feedback_1 = |
| CreatePacketResultsWith50pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| std::vector<PacketResult> enough_feedback_2 = |
| CreatePacketResultsWith100pLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| 2 * kObservationDurationLowerBound); |
| |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/true, /*valid=*/true)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| DataRate acked_bitrate = DataRate::KilobitsPerSec(300); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate(acked_bitrate); |
| // Update estimate when network is overusing, and 50% loss rate. |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_1, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| // Update estimate again when network is continuously overusing, and 100% |
| // loss rate. |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_2, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| // The estimate bitrate now is backed off based on acked bitrate. |
| EXPECT_LE( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| acked_bitrate); |
| } |
| |
| // When receiving the same packet feedback, loss based bwe ignores the feedback |
| // and returns the current estimate. |
| TEST_F(LossBasedBweV2Test, NoBweChangeIfObservationDurationUnchanged) { |
| std::vector<PacketResult> enough_feedback_1 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/true, /*valid=*/true)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate( |
| DataRate::KilobitsPerSec(300)); |
| |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_1, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| |
| /*in_alr=*/false); |
| DataRate estimate_1 = |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate; |
| |
| // Use the same feedback and check if the estimate is unchanged. |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_1, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| |
| /*in_alr=*/false); |
| DataRate estimate_2 = |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate; |
| EXPECT_EQ(estimate_2, estimate_1); |
| } |
| |
| // When receiving feedback of packets that were sent within an observation |
| // duration, and network is in the normal state, loss based bwe returns the |
| // current estimate. |
| TEST_F(LossBasedBweV2Test, |
| NoBweChangeIfObservationDurationIsSmallAndNetworkNormal) { |
| std::vector<PacketResult> enough_feedback_1 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| std::vector<PacketResult> enough_feedback_2 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound - TimeDelta::Millis(1)); |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/true, /*valid=*/true)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_1, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| |
| /*in_alr=*/false); |
| DataRate estimate_1 = |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate; |
| |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_2, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| |
| /*in_alr=*/false); |
| DataRate estimate_2 = |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate; |
| EXPECT_EQ(estimate_2, estimate_1); |
| } |
| |
| // When receiving feedback of packets that were sent within an observation |
| // duration, and network is in the underusing state, loss based bwe returns the |
| // current estimate. |
| TEST_F(LossBasedBweV2Test, |
| NoBweIncreaseIfObservationDurationIsSmallAndNetworkUnderusing) { |
| std::vector<PacketResult> enough_feedback_1 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| std::vector<PacketResult> enough_feedback_2 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound - TimeDelta::Millis(1)); |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/true, /*valid=*/true)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_1, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| |
| /*in_alr=*/false); |
| DataRate estimate_1 = |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate; |
| |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_2, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| DataRate estimate_2 = |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate; |
| EXPECT_LE(estimate_2, estimate_1); |
| } |
| |
| TEST_F(LossBasedBweV2Test, |
| IncreaseToDelayBasedEstimateIfNoLossOrDelayIncrease) { |
| std::vector<PacketResult> enough_feedback_1 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| std::vector<PacketResult> enough_feedback_2 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| 2 * kObservationDurationLowerBound); |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/true, /*valid=*/true)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| DataRate delay_based_estimate = DataRate::KilobitsPerSec(5000); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate(enough_feedback_1, |
| delay_based_estimate, |
| /*in_alr=*/false); |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| delay_based_estimate); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate(enough_feedback_2, |
| delay_based_estimate, |
| /*in_alr=*/false); |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| delay_based_estimate); |
| } |
| |
| TEST_F(LossBasedBweV2Test, |
| IncreaseByMaxIncreaseFactorAfterLossBasedBweBacksOff) { |
| ExplicitKeyValueConfig key_value_config(ShortObservationConfig( |
| "CandidateFactors:1.2|1|0.5," |
| "InstantUpperBoundBwBalance:10000kbps," |
| "MaxIncreaseFactor:1.5,NotIncreaseIfInherentLossLessThanAverageLoss:" |
| "false")); |
| |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| DataRate delay_based_estimate = DataRate::KilobitsPerSec(5000); |
| DataRate acked_rate = DataRate::KilobitsPerSec(300); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate(acked_rate); |
| |
| // Create some loss to create the loss limited scenario. |
| std::vector<PacketResult> enough_feedback_1 = |
| CreatePacketResultsWith100pLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate(enough_feedback_1, |
| delay_based_estimate, |
| /*in_alr=*/false); |
| LossBasedBweV2::Result result_at_loss = |
| loss_based_bandwidth_estimator.GetLossBasedResult(); |
| |
| // Network recovers after loss. |
| std::vector<PacketResult> enough_feedback_2 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate(enough_feedback_2, |
| delay_based_estimate, |
| /*in_alr=*/false); |
| |
| LossBasedBweV2::Result result_after_recovery = |
| loss_based_bandwidth_estimator.GetLossBasedResult(); |
| EXPECT_EQ(result_after_recovery.bandwidth_estimate, |
| result_at_loss.bandwidth_estimate * 1.5); |
| } |
| |
| TEST_F(LossBasedBweV2Test, |
| LossBasedStateIsDelayBasedEstimateAfterNetworkRecovering) { |
| ExplicitKeyValueConfig key_value_config(ShortObservationConfig( |
| "CandidateFactors:100|1|0.5," |
| "InstantUpperBoundBwBalance:10000kbps," |
| "MaxIncreaseFactor:100," |
| "NotIncreaseIfInherentLossLessThanAverageLoss:false")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| DataRate delay_based_estimate = DataRate::KilobitsPerSec(600); |
| DataRate acked_rate = DataRate::KilobitsPerSec(300); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate(acked_rate); |
| |
| // Create some loss to create the loss limited scenario. |
| std::vector<PacketResult> enough_feedback_1 = |
| CreatePacketResultsWith100pLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate(enough_feedback_1, |
| delay_based_estimate, |
| /*in_alr=*/false); |
| ASSERT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDecreasing); |
| |
| // Network recovers after loss. |
| std::vector<PacketResult> enough_feedback_2 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate(enough_feedback_2, |
| delay_based_estimate, |
| /*in_alr=*/false); |
| EXPECT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDelayBasedEstimate); |
| |
| // Network recovers continuing. |
| std::vector<PacketResult> enough_feedback_3 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound * 2); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate(enough_feedback_3, |
| delay_based_estimate, |
| /*in_alr=*/false); |
| EXPECT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDelayBasedEstimate); |
| } |
| |
| TEST_F(LossBasedBweV2Test, |
| LossBasedStateIsNotDelayBasedEstimateIfDelayBasedEstimateInfinite) { |
| ExplicitKeyValueConfig key_value_config( |
| ShortObservationConfig("CandidateFactors:100|1|0.5," |
| "InstantUpperBoundBwBalance:10000kbps," |
| "MaxIncreaseFactor:100")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| |
| // Create some loss to create the loss limited scenario. |
| std::vector<PacketResult> enough_feedback_1 = |
| CreatePacketResultsWith100pLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_1, |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| ASSERT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDecreasing); |
| |
| // Network recovers after loss. |
| std::vector<PacketResult> enough_feedback_2 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_2, |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| EXPECT_NE(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDelayBasedEstimate); |
| } |
| |
| // After loss based bwe backs off, the next estimate is capped by |
| // a factor of acked bitrate. |
| TEST_F(LossBasedBweV2Test, |
| IncreaseByFactorOfAckedBitrateAfterLossBasedBweBacksOff) { |
| ExplicitKeyValueConfig key_value_config(ShortObservationConfig( |
| "LossThresholdOfHighBandwidthPreference:0.99," |
| "BwRampupUpperBoundFactor:1.2," |
| // Set InstantUpperBoundBwBalance high to disable InstantUpperBound cap. |
| "InstantUpperBoundBwBalance:10000kbps,")); |
| std::vector<PacketResult> enough_feedback_1 = |
| CreatePacketResultsWith100pLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| DataRate delay_based_estimate = DataRate::KilobitsPerSec(5000); |
| |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate( |
| DataRate::KilobitsPerSec(300)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate(enough_feedback_1, |
| delay_based_estimate, |
| /*in_alr=*/false); |
| ASSERT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDecreasing); |
| LossBasedBweV2::Result result = |
| loss_based_bandwidth_estimator.GetLossBasedResult(); |
| DataRate estimate_1 = result.bandwidth_estimate; |
| ASSERT_LT(estimate_1.kbps(), 600); |
| |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate(estimate_1 * 0.9); |
| |
| int feedback_count = 1; |
| while (feedback_count < 5 && result.state != LossBasedState::kIncreasing) { |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| feedback_count++ * kObservationDurationLowerBound), |
| delay_based_estimate, |
| /*in_alr=*/false); |
| result = loss_based_bandwidth_estimator.GetLossBasedResult(); |
| } |
| ASSERT_EQ(result.state, LossBasedState::kIncreasing); |
| |
| // The estimate is capped by acked_bitrate * BwRampupUpperBoundFactor. |
| EXPECT_EQ(result.bandwidth_estimate, estimate_1 * 0.9 * 1.2); |
| |
| // But if acked bitrate decreases, BWE does not decrease when there is no |
| // loss. |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate(estimate_1 * 0.9); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| feedback_count++ * kObservationDurationLowerBound), |
| delay_based_estimate, |
| /*in_alr=*/false); |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| result.bandwidth_estimate); |
| } |
| |
| // Ensure that the state can switch to kIncrease even when the bandwidth is |
| // bounded by acked bitrate. |
| TEST_F(LossBasedBweV2Test, EnsureIncreaseEvenIfAckedBitrateBound) { |
| ExplicitKeyValueConfig key_value_config(ShortObservationConfig( |
| "LossThresholdOfHighBandwidthPreference:0.99," |
| "BwRampupUpperBoundFactor:1.2," |
| // Set InstantUpperBoundBwBalance high to disable InstantUpperBound cap. |
| "InstantUpperBoundBwBalance:10000kbps,")); |
| std::vector<PacketResult> enough_feedback_1 = |
| CreatePacketResultsWith100pLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| DataRate delay_based_estimate = DataRate::KilobitsPerSec(5000); |
| |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate( |
| DataRate::KilobitsPerSec(300)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate(enough_feedback_1, |
| delay_based_estimate, |
| /*in_alr=*/false); |
| ASSERT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDecreasing); |
| LossBasedBweV2::Result result = |
| loss_based_bandwidth_estimator.GetLossBasedResult(); |
| DataRate estimate_1 = result.bandwidth_estimate; |
| ASSERT_LT(estimate_1.kbps(), 600); |
| |
| // Set a low acked bitrate. |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate(estimate_1 / 2); |
| |
| int feedback_count = 1; |
| while (feedback_count < 5 && result.state != LossBasedState::kIncreasing) { |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| feedback_count++ * kObservationDurationLowerBound), |
| delay_based_estimate, |
| /*in_alr=*/false); |
| result = loss_based_bandwidth_estimator.GetLossBasedResult(); |
| } |
| |
| ASSERT_EQ(result.state, LossBasedState::kIncreasing); |
| // The estimate increases by 1kbps. |
| EXPECT_EQ(result.bandwidth_estimate, |
| estimate_1 + DataRate::KilobitsPerSec(1)); |
| } |
| |
| // After loss based bwe backs off, the estimate is bounded during the delayed |
| // window. |
| TEST_F(LossBasedBweV2Test, |
| EstimateBitrateIsBoundedDuringDelayedWindowAfterLossBasedBweBacksOff) { |
| std::vector<PacketResult> enough_feedback_1 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| std::vector<PacketResult> enough_feedback_2 = |
| CreatePacketResultsWith50pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kDelayedIncreaseWindow - TimeDelta::Millis(2)); |
| std::vector<PacketResult> enough_feedback_3 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kDelayedIncreaseWindow - TimeDelta::Millis(1)); |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/true, /*valid=*/true)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| DataRate delay_based_estimate = DataRate::KilobitsPerSec(5000); |
| |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate( |
| DataRate::KilobitsPerSec(300)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate(enough_feedback_1, |
| delay_based_estimate, |
| /*in_alr=*/false); |
| // Increase the acknowledged bitrate to make sure that the estimate is not |
| // capped too low. |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate( |
| DataRate::KilobitsPerSec(5000)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate(enough_feedback_2, |
| delay_based_estimate, |
| /*in_alr=*/false); |
| |
| // The estimate is capped by current_estimate * kMaxIncreaseFactor because |
| // it recently backed off. |
| DataRate estimate_2 = |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate; |
| |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate(enough_feedback_3, |
| delay_based_estimate, |
| /*in_alr=*/false); |
| // The latest estimate is the same as the previous estimate since the sent |
| // packets were sent within the DelayedIncreaseWindow. |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| estimate_2); |
| } |
| |
| // The estimate is not bounded after the delayed increase window. |
| TEST_F(LossBasedBweV2Test, KeepIncreasingEstimateAfterDelayedIncreaseWindow) { |
| std::vector<PacketResult> enough_feedback_1 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| std::vector<PacketResult> enough_feedback_2 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kDelayedIncreaseWindow - TimeDelta::Millis(1)); |
| std::vector<PacketResult> enough_feedback_3 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kDelayedIncreaseWindow + TimeDelta::Millis(1)); |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/true, /*valid=*/true)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| DataRate delay_based_estimate = DataRate::KilobitsPerSec(5000); |
| |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate( |
| DataRate::KilobitsPerSec(300)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate(enough_feedback_1, |
| delay_based_estimate, |
| /*in_alr=*/false); |
| // Increase the acknowledged bitrate to make sure that the estimate is not |
| // capped too low. |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate( |
| DataRate::KilobitsPerSec(5000)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate(enough_feedback_2, |
| delay_based_estimate, |
| /*in_alr=*/false); |
| |
| // The estimate is capped by current_estimate * kMaxIncreaseFactor because it |
| // recently backed off. |
| DataRate estimate_2 = |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate; |
| |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate(enough_feedback_3, |
| delay_based_estimate, |
| /*in_alr=*/false); |
| // The estimate can continue increasing after the DelayedIncreaseWindow. |
| EXPECT_GE( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| estimate_2); |
| } |
| |
| TEST_F(LossBasedBweV2Test, NotIncreaseIfInherentLossLessThanAverageLoss) { |
| ExplicitKeyValueConfig key_value_config(ShortObservationConfig( |
| "CandidateFactors:1.2," |
| "NotIncreaseIfInherentLossLessThanAverageLoss:true")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| |
| std::vector<PacketResult> enough_feedback_10p_loss_1 = |
| CreatePacketResultsWith10pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_10p_loss_1, |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| |
| std::vector<PacketResult> enough_feedback_10p_loss_2 = |
| CreatePacketResultsWith10pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_10p_loss_2, |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| |
| // Do not increase the bitrate because inherent loss is less than average loss |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(600)); |
| } |
| |
| TEST_F(LossBasedBweV2Test, |
| SelectHighBandwidthCandidateIfLossRateIsLessThanThreshold) { |
| ExplicitKeyValueConfig key_value_config(ShortObservationConfig( |
| "LossThresholdOfHighBandwidthPreference:0.20," |
| "NotIncreaseIfInherentLossLessThanAverageLoss:false")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| DataRate delay_based_estimate = DataRate::KilobitsPerSec(5000); |
| |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| |
| std::vector<PacketResult> enough_feedback_10p_loss_1 = |
| CreatePacketResultsWith10pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_10p_loss_1, delay_based_estimate, |
| |
| /*in_alr=*/false); |
| |
| std::vector<PacketResult> enough_feedback_10p_loss_2 = |
| CreatePacketResultsWith10pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_10p_loss_2, delay_based_estimate, |
| |
| /*in_alr=*/false); |
| |
| // Because LossThresholdOfHighBandwidthPreference is 20%, the average loss is |
| // 10%, bandwidth estimate should increase. |
| EXPECT_GT( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(600)); |
| } |
| |
| TEST_F(LossBasedBweV2Test, |
| SelectLowBandwidthCandidateIfLossRateIsIsHigherThanThreshold) { |
| ExplicitKeyValueConfig key_value_config( |
| ShortObservationConfig("LossThresholdOfHighBandwidthPreference:0.05")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| DataRate delay_based_estimate = DataRate::KilobitsPerSec(5000); |
| |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| |
| std::vector<PacketResult> enough_feedback_10p_loss_1 = |
| CreatePacketResultsWith10pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_10p_loss_1, delay_based_estimate, |
| |
| /*in_alr=*/false); |
| |
| std::vector<PacketResult> enough_feedback_10p_loss_2 = |
| CreatePacketResultsWith10pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_10p_loss_2, delay_based_estimate, |
| |
| /*in_alr=*/false); |
| |
| // Because LossThresholdOfHighBandwidthPreference is 5%, the average loss is |
| // 10%, bandwidth estimate should decrease. |
| EXPECT_LT( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(600)); |
| } |
| |
| TEST_F(LossBasedBweV2Test, |
| StricterBoundUsingHighLossRateThresholdAt10pLossRate) { |
| ExplicitKeyValueConfig key_value_config( |
| ShortObservationConfig("HighLossRateThreshold:0.09")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetMinMaxBitrate( |
| /*min_bitrate=*/DataRate::KilobitsPerSec(10), |
| /*max_bitrate=*/DataRate::KilobitsPerSec(1000000)); |
| DataRate delay_based_estimate = DataRate::KilobitsPerSec(5000); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| |
| std::vector<PacketResult> enough_feedback_10p_loss_1 = |
| CreatePacketResultsWith10pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_10p_loss_1, delay_based_estimate, |
| |
| /*in_alr=*/false); |
| |
| std::vector<PacketResult> enough_feedback_10p_loss_2 = |
| CreatePacketResultsWith10pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_10p_loss_2, delay_based_estimate, |
| |
| /*in_alr=*/false); |
| |
| // At 10% loss rate and high loss rate threshold to be 10%, cap the estimate |
| // to be 500 * 1000-0.1 = 400kbps. |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(400)); |
| } |
| |
| TEST_F(LossBasedBweV2Test, |
| StricterBoundUsingHighLossRateThresholdAt50pLossRate) { |
| ExplicitKeyValueConfig key_value_config( |
| ShortObservationConfig("HighLossRateThreshold:0.3")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetMinMaxBitrate( |
| /*min_bitrate=*/DataRate::KilobitsPerSec(10), |
| /*max_bitrate=*/DataRate::KilobitsPerSec(1000000)); |
| DataRate delay_based_estimate = DataRate::KilobitsPerSec(5000); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| |
| std::vector<PacketResult> enough_feedback_50p_loss_1 = |
| CreatePacketResultsWith50pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_50p_loss_1, delay_based_estimate, |
| |
| /*in_alr=*/false); |
| |
| std::vector<PacketResult> enough_feedback_50p_loss_2 = |
| CreatePacketResultsWith50pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_50p_loss_2, delay_based_estimate, |
| |
| /*in_alr=*/false); |
| |
| // At 50% loss rate and high loss rate threshold to be 30%, cap the estimate |
| // to be the min bitrate. |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(10)); |
| } |
| |
| TEST_F(LossBasedBweV2Test, |
| StricterBoundUsingHighLossRateThresholdAt100pLossRate) { |
| ExplicitKeyValueConfig key_value_config( |
| ShortObservationConfig("HighLossRateThreshold:0.3")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetMinMaxBitrate( |
| /*min_bitrate=*/DataRate::KilobitsPerSec(10), |
| /*max_bitrate=*/DataRate::KilobitsPerSec(1000000)); |
| DataRate delay_based_estimate = DataRate::KilobitsPerSec(5000); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| |
| std::vector<PacketResult> enough_feedback_100p_loss_1 = |
| CreatePacketResultsWith100pLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_100p_loss_1, delay_based_estimate, |
| |
| /*in_alr=*/false); |
| |
| std::vector<PacketResult> enough_feedback_100p_loss_2 = |
| CreatePacketResultsWith100pLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_100p_loss_2, delay_based_estimate, |
| |
| /*in_alr=*/false); |
| |
| // At 100% loss rate and high loss rate threshold to be 30%, cap the estimate |
| // to be the min bitrate. |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(10)); |
| } |
| |
| TEST_F(LossBasedBweV2Test, EstimateRecoversAfterHighLoss) { |
| ExplicitKeyValueConfig key_value_config( |
| ShortObservationConfig("HighLossRateThreshold:0.3")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetMinMaxBitrate( |
| /*min_bitrate=*/DataRate::KilobitsPerSec(10), |
| /*max_bitrate=*/DataRate::KilobitsPerSec(1000000)); |
| DataRate delay_based_estimate = DataRate::KilobitsPerSec(5000); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| |
| std::vector<PacketResult> enough_feedback_100p_loss_1 = |
| CreatePacketResultsWith100pLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_100p_loss_1, delay_based_estimate, |
| |
| /*in_alr=*/false); |
| |
| // Make sure that the estimate is set to min bitrate because of 100% loss |
| // rate. |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(10)); |
| |
| // Create some feedbacks with 0 loss rate to simulate network recovering. |
| std::vector<PacketResult> enough_feedback_0p_loss_1 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_0p_loss_1, delay_based_estimate, |
| |
| /*in_alr=*/false); |
| |
| std::vector<PacketResult> enough_feedback_0p_loss_2 = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound * 2); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_0p_loss_2, delay_based_estimate, |
| |
| /*in_alr=*/false); |
| |
| // The estimate increases as network recovers. |
| EXPECT_GT( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(10)); |
| } |
| |
| TEST_F(LossBasedBweV2Test, EstimateIsNotHigherThanMaxBitrate) { |
| ExplicitKeyValueConfig key_value_config( |
| Config(/*enabled=*/true, /*valid=*/true)); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetMinMaxBitrate( |
| /*min_bitrate=*/DataRate::KilobitsPerSec(10), |
| /*max_bitrate=*/DataRate::KilobitsPerSec(1000)); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(1000)); |
| std::vector<PacketResult> enough_feedback = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback, /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| |
| /*in_alr=*/false); |
| |
| EXPECT_LE( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(1000)); |
| } |
| |
| TEST_F(LossBasedBweV2Test, NotBackOffToAckedRateInAlr) { |
| ExplicitKeyValueConfig key_value_config( |
| ShortObservationConfig("InstantUpperBoundBwBalance:100kbps")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetMinMaxBitrate( |
| /*min_bitrate=*/DataRate::KilobitsPerSec(10), |
| /*max_bitrate=*/DataRate::KilobitsPerSec(1000000)); |
| DataRate delay_based_estimate = DataRate::KilobitsPerSec(5000); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| |
| DataRate acked_rate = DataRate::KilobitsPerSec(100); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate(acked_rate); |
| std::vector<PacketResult> enough_feedback_100p_loss_1 = |
| CreatePacketResultsWith100pLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_100p_loss_1, delay_based_estimate, |
| /*in_alr=*/true); |
| |
| // Make sure that the estimate decreases but higher than acked rate. |
| EXPECT_GT( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| acked_rate); |
| |
| EXPECT_LT( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(600)); |
| } |
| |
| TEST_F(LossBasedBweV2Test, BackOffToAckedRateIfNotInAlr) { |
| ExplicitKeyValueConfig key_value_config( |
| ShortObservationConfig("InstantUpperBoundBwBalance:100kbps")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetMinMaxBitrate( |
| /*min_bitrate=*/DataRate::KilobitsPerSec(10), |
| /*max_bitrate=*/DataRate::KilobitsPerSec(1000000)); |
| DataRate delay_based_estimate = DataRate::KilobitsPerSec(5000); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| |
| DataRate acked_rate = DataRate::KilobitsPerSec(100); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate(acked_rate); |
| std::vector<PacketResult> enough_feedback_100p_loss_1 = |
| CreatePacketResultsWith100pLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_100p_loss_1, delay_based_estimate, |
| |
| /*in_alr=*/false); |
| |
| // Make sure that the estimate decreases but higher than acked rate. |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| acked_rate); |
| } |
| |
| TEST_F(LossBasedBweV2Test, NotReadyToUseInStartPhase) { |
| ExplicitKeyValueConfig key_value_config( |
| ShortObservationConfig("UseInStartPhase:true")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| // Make sure that the estimator is not ready to use in start phase because of |
| // lacking TWCC feedback. |
| EXPECT_FALSE(loss_based_bandwidth_estimator.ReadyToUseInStartPhase()); |
| } |
| |
| TEST_F(LossBasedBweV2Test, ReadyToUseInStartPhase) { |
| ExplicitKeyValueConfig key_value_config( |
| ShortObservationConfig("UseInStartPhase:true")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| std::vector<PacketResult> enough_feedback = |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback, /*delay_based_estimate=*/DataRate::KilobitsPerSec(600), |
| /*in_alr=*/false); |
| EXPECT_TRUE(loss_based_bandwidth_estimator.ReadyToUseInStartPhase()); |
| } |
| |
| TEST_F(LossBasedBweV2Test, BoundEstimateByAckedRate) { |
| ExplicitKeyValueConfig key_value_config( |
| ShortObservationConfig("LowerBoundByAckedRateFactor:1.0")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetMinMaxBitrate( |
| /*min_bitrate=*/DataRate::KilobitsPerSec(10), |
| /*max_bitrate=*/DataRate::KilobitsPerSec(1000000)); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate( |
| DataRate::KilobitsPerSec(500)); |
| |
| std::vector<PacketResult> enough_feedback_100p_loss_1 = |
| CreatePacketResultsWith100pLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_100p_loss_1, |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(500)); |
| } |
| |
| TEST_F(LossBasedBweV2Test, NotBoundEstimateByAckedRate) { |
| ExplicitKeyValueConfig key_value_config( |
| ShortObservationConfig("LowerBoundByAckedRateFactor:0.0")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetMinMaxBitrate( |
| /*min_bitrate=*/DataRate::KilobitsPerSec(10), |
| /*max_bitrate=*/DataRate::KilobitsPerSec(1000000)); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(600)); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate( |
| DataRate::KilobitsPerSec(500)); |
| |
| std::vector<PacketResult> enough_feedback_100p_loss_1 = |
| CreatePacketResultsWith100pLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_100p_loss_1, |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| |
| EXPECT_LT( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(500)); |
| } |
| |
| TEST_F(LossBasedBweV2Test, HasDecreaseStateBecauseOfUpperBound) { |
| ExplicitKeyValueConfig key_value_config(ShortObservationConfig( |
| "CandidateFactors:1.0,InstantUpperBoundBwBalance:10kbps")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetMinMaxBitrate( |
| /*min_bitrate=*/DataRate::KilobitsPerSec(10), |
| /*max_bitrate=*/DataRate::KilobitsPerSec(1000000)); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(500)); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate( |
| DataRate::KilobitsPerSec(500)); |
| |
| std::vector<PacketResult> enough_feedback_10p_loss_1 = |
| CreatePacketResultsWith10pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_10p_loss_1, |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| |
| // Verify that the instant upper bound decreases the estimate, and state is |
| // updated to kDecreasing. |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(200)); |
| EXPECT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDecreasing); |
| } |
| |
| TEST_F(LossBasedBweV2Test, HasIncreaseStateBecauseOfLowerBound) { |
| ExplicitKeyValueConfig key_value_config(ShortObservationConfig( |
| "CandidateFactors:1.0,LowerBoundByAckedRateFactor:10.0")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetMinMaxBitrate( |
| /*min_bitrate=*/DataRate::KilobitsPerSec(10), |
| /*max_bitrate=*/DataRate::KilobitsPerSec(1000000)); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(500)); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate( |
| DataRate::KilobitsPerSec(1)); |
| |
| // Network has a high loss to create a loss scenario. |
| std::vector<PacketResult> enough_feedback_50p_loss_1 = |
| CreatePacketResultsWith50pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_50p_loss_1, |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| |
| ASSERT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDecreasing); |
| |
| // Network still has a high loss, but better acked rate. |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate( |
| DataRate::KilobitsPerSec(200)); |
| std::vector<PacketResult> enough_feedback_50p_loss_2 = |
| CreatePacketResultsWith50pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| enough_feedback_50p_loss_2, |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| |
| // Verify that the instant lower bound increases the estimate, and state is |
| // updated to kIncreasing. |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(200) * 10); |
| EXPECT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kIncreasing); |
| } |
| |
| TEST_F(LossBasedBweV2Test, |
| EstimateIncreaseSlowlyFromInstantUpperBoundInAlrIfFieldTrial) { |
| ExplicitKeyValueConfig key_value_config( |
| ShortObservationConfig("UpperBoundCandidateInAlr:true")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(1000)); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate( |
| DataRate::KilobitsPerSec(150)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWith50pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()), |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/true); |
| LossBasedBweV2::Result result_after_loss = |
| loss_based_bandwidth_estimator.GetLossBasedResult(); |
| ASSERT_EQ(result_after_loss.state, LossBasedState::kDecreasing); |
| |
| for (int feedback_count = 1; feedback_count <= 3; ++feedback_count) { |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| feedback_count * kObservationDurationLowerBound), |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/true); |
| } |
| // Expect less than 100% increase. |
| EXPECT_LT( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| 2 * result_after_loss.bandwidth_estimate); |
| } |
| |
| TEST_F(LossBasedBweV2Test, HasDelayBasedStateIfLossBasedBweIsMax) { |
| ExplicitKeyValueConfig key_value_config(ShortObservationConfig("")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetMinMaxBitrate( |
| /*min_bitrate=*/DataRate::KilobitsPerSec(10), |
| /*max_bitrate=*/DataRate::KilobitsPerSec(1000)); |
| |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| /*feedback = */ CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero()), |
| /*delay_based_estimate=*/DataRate::KilobitsPerSec(2000), |
| /*in_alr=*/false); |
| EXPECT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDelayBasedEstimate); |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(1000)); |
| |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| /*feedback=*/CreatePacketResultsWith50pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound), |
| /*delay_based_estimate=*/DataRate::KilobitsPerSec(2000), |
| /*in_alr=*/false); |
| LossBasedBweV2::Result result = |
| loss_based_bandwidth_estimator.GetLossBasedResult(); |
| ASSERT_EQ(result.state, LossBasedState::kDecreasing); |
| ASSERT_LT(result.bandwidth_estimate, DataRate::KilobitsPerSec(1000)); |
| |
| // Eventually the estimator recovers to delay based state. |
| int feedback_count = 2; |
| while (feedback_count < 5 && |
| result.state != LossBasedState::kDelayBasedEstimate) { |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| /*feedback = */ CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| feedback_count++ * kObservationDurationLowerBound), |
| /*delay_based_estimate=*/DataRate::KilobitsPerSec(2000), |
| /*in_alr=*/false); |
| result = loss_based_bandwidth_estimator.GetLossBasedResult(); |
| } |
| EXPECT_EQ(result.state, LossBasedState::kDelayBasedEstimate); |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(1000)); |
| } |
| |
| TEST_F(LossBasedBweV2Test, IncreaseUsingPaddingStateIfFieldTrial) { |
| ExplicitKeyValueConfig key_value_config( |
| ShortObservationConfig("PaddingDuration:1000ms")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(2500)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWith50pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()), |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| ASSERT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDecreasing); |
| |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound), |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| EXPECT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kIncreaseUsingPadding); |
| } |
| |
| TEST_F(LossBasedBweV2Test, DecreaseAfterPadding) { |
| ExplicitKeyValueConfig key_value_config(ShortObservationConfig( |
| "PaddingDuration:1000ms,BwRampupUpperBoundFactor:2.0")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(2500)); |
| DataRate acknowledged_bitrate = DataRate::KilobitsPerSec(51); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate(acknowledged_bitrate); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWith50pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()), |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| ASSERT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDecreasing); |
| ASSERT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| acknowledged_bitrate); |
| |
| acknowledged_bitrate = DataRate::KilobitsPerSec(26); |
| loss_based_bandwidth_estimator.SetAcknowledgedBitrate(acknowledged_bitrate); |
| int feedback_id = 1; |
| while (loss_based_bandwidth_estimator.GetLossBasedResult().state != |
| LossBasedState::kIncreaseUsingPadding) { |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound * feedback_id), |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| feedback_id++; |
| } |
| |
| const Timestamp estimate_increased = |
| Timestamp::Zero() + kObservationDurationLowerBound * feedback_id; |
| // The state is kIncreaseUsingPadding for a while without changing the |
| // estimate, which is limited by 2 * acked rate. |
| while (loss_based_bandwidth_estimator.GetLossBasedResult().state == |
| LossBasedState::kIncreaseUsingPadding) { |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound * feedback_id), |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| feedback_id++; |
| } |
| |
| EXPECT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDecreasing); |
| const Timestamp start_decreasing = |
| Timestamp::Zero() + kObservationDurationLowerBound * (feedback_id - 1); |
| EXPECT_EQ(start_decreasing - estimate_increased, TimeDelta::Seconds(1)); |
| } |
| |
| TEST_F(LossBasedBweV2Test, IncreaseEstimateIfNotHold) { |
| ExplicitKeyValueConfig key_value_config( |
| ShortObservationConfig("HoldDurationFactor:0")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(2500)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWith50pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()), |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| ASSERT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDecreasing); |
| DataRate estimate = |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate; |
| |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound), |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| EXPECT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kIncreasing); |
| EXPECT_GT( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| estimate); |
| } |
| |
| TEST_F(LossBasedBweV2Test, IncreaseEstimateAfterHoldDuration) { |
| ExplicitKeyValueConfig key_value_config( |
| ShortObservationConfig("HoldDurationFactor:3")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(2500)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWith50pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()), |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| ASSERT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDecreasing); |
| DataRate estimate = |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate; |
| |
| // During the hold duration, e.g. first 300ms, the estimate cannot increase. |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound), |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| EXPECT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDecreasing); |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| estimate); |
| |
| // After the hold duration, the estimate can increase. |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound * 2), |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| EXPECT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kIncreasing); |
| EXPECT_GE( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| estimate); |
| |
| // Get another 50p packet loss. |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWith50pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound * 3), |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| EXPECT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDecreasing); |
| estimate = |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate; |
| |
| // During the hold duration, e.g. next 900ms, the estimate cannot increase. |
| for (int i = 4; i <= 6; ++i) { |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound * i), |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| EXPECT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDecreasing); |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| estimate); |
| } |
| |
| // After the hold duration, the estimate can increase again. |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound * 7), |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| EXPECT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kIncreasing); |
| EXPECT_GE( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| estimate); |
| } |
| |
| TEST_F(LossBasedBweV2Test, EndHoldDurationIfDelayBasedEstimateWorks) { |
| ExplicitKeyValueConfig key_value_config( |
| ShortObservationConfig("HoldDurationFactor:3")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(2500)); |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWith50pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero()), |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| ASSERT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDecreasing); |
| DataRate estimate = |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate; |
| |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWithReceivedPackets( |
| /*first_packet_timestamp=*/Timestamp::Zero() + |
| kObservationDurationLowerBound), |
| /*delay_based_estimate=*/estimate + DataRate::KilobitsPerSec(10), |
| /*in_alr=*/false); |
| EXPECT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDelayBasedEstimate); |
| EXPECT_EQ( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| estimate + DataRate::KilobitsPerSec(10)); |
| } |
| |
| TEST_F(LossBasedBweV2Test, UseByteLossRate) { |
| ExplicitKeyValueConfig key_value_config( |
| ShortObservationConfig("UseByteLossRate:true")); |
| LossBasedBweV2 loss_based_bandwidth_estimator(&key_value_config); |
| loss_based_bandwidth_estimator.SetBandwidthEstimate( |
| DataRate::KilobitsPerSec(500)); |
| // Create packet feedback having 10% packet loss but more than 50% byte loss. |
| loss_based_bandwidth_estimator.UpdateBandwidthEstimate( |
| CreatePacketResultsWith10pPacketLossRate( |
| /*first_packet_timestamp=*/Timestamp::Zero(), |
| /*lost_packet_size=*/DataSize::Bytes(kPacketSize * 20)), |
| /*delay_based_estimate=*/DataRate::PlusInfinity(), |
| /*in_alr=*/false); |
| EXPECT_EQ(loss_based_bandwidth_estimator.GetLossBasedResult().state, |
| LossBasedState::kDecreasing); |
| // The estimate is bounded by the instant upper bound due to high loss. |
| EXPECT_LT( |
| loss_based_bandwidth_estimator.GetLossBasedResult().bandwidth_estimate, |
| DataRate::KilobitsPerSec(150)); |
| } |
| |
| } // namespace |
| } // namespace webrtc |
