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robust_throughput_estimator_unittest.cc
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/*
* Copyright (c) 2019 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/robust_throughput_estimator.h"
#include "api/transport/field_trial_based_config.h"
#include "test/field_trial.h"
#include "test/gtest.h"
namespace webrtc {
namespace {
std::vector<PacketResult> CreateFeedbackVector(size_t number_of_packets,
DataSize packet_size,
TimeDelta send_increment,
TimeDelta recv_increment,
Timestamp* send_clock,
Timestamp* recv_clock,
uint16_t* sequence_number) {
std::vector<PacketResult> packet_feedback_vector(number_of_packets);
for (size_t i = 0; i < number_of_packets; i++) {
packet_feedback_vector[i].receive_time = *recv_clock;
packet_feedback_vector[i].sent_packet.send_time = *send_clock;
packet_feedback_vector[i].sent_packet.sequence_number = *sequence_number;
packet_feedback_vector[i].sent_packet.size = packet_size;
*send_clock += send_increment;
*recv_clock += recv_increment;
*sequence_number += 1;
}
return packet_feedback_vector;
}
} // anonymous namespace
TEST(RobustThroughputEstimatorTest, SteadyRate) {
webrtc::test::ScopedFieldTrials field_trials(
"WebRTC-Bwe-RobustThroughputEstimatorSettings/"
"enabled:true,assume_shared_link:false,reduce_bias:true,min_packets:10,"
"window_duration:100ms/");
FieldTrialBasedConfig field_trial_config;
RobustThroughputEstimatorSettings settings(&field_trial_config);
RobustThroughputEstimator throughput_estimator(settings);
DataSize packet_size(DataSize::Bytes(1000));
Timestamp send_clock(Timestamp::Millis(100000));
Timestamp recv_clock(Timestamp::Millis(10000));
TimeDelta send_increment(TimeDelta::Millis(10));
TimeDelta recv_increment(TimeDelta::Millis(10));
uint16_t sequence_number = 100;
std::vector<PacketResult> packet_feedback =
CreateFeedbackVector(9, packet_size, send_increment, recv_increment,
&send_clock, &recv_clock, &sequence_number);
throughput_estimator.IncomingPacketFeedbackVector(packet_feedback);
EXPECT_FALSE(throughput_estimator.bitrate().has_value());
packet_feedback =
CreateFeedbackVector(11, packet_size, send_increment, recv_increment,
&send_clock, &recv_clock, &sequence_number);
throughput_estimator.IncomingPacketFeedbackVector(packet_feedback);
auto throughput = throughput_estimator.bitrate();
EXPECT_TRUE(throughput.has_value());
EXPECT_NEAR(throughput.value().bytes_per_sec<double>(), 100 * 1000.0,
0.05 * 100 * 1000.0); // Allow 5% error
}
TEST(RobustThroughputEstimatorTest, DelaySpike) {
webrtc::test::ScopedFieldTrials field_trials(
"WebRTC-Bwe-RobustThroughputEstimatorSettings/"
"enabled:true,assume_shared_link:false,reduce_bias:true,min_packets:10,"
"window_duration:100ms/");
FieldTrialBasedConfig field_trial_config;
RobustThroughputEstimatorSettings settings(&field_trial_config);
RobustThroughputEstimator throughput_estimator(settings);
DataSize packet_size(DataSize::Bytes(1000));
Timestamp send_clock(Timestamp::Millis(100000));
Timestamp recv_clock(Timestamp::Millis(10000));
TimeDelta send_increment(TimeDelta::Millis(10));
TimeDelta recv_increment(TimeDelta::Millis(10));
uint16_t sequence_number = 100;
std::vector<PacketResult> packet_feedback =
CreateFeedbackVector(20, packet_size, send_increment, recv_increment,
&send_clock, &recv_clock, &sequence_number);
throughput_estimator.IncomingPacketFeedbackVector(packet_feedback);
auto throughput = throughput_estimator.bitrate();
EXPECT_TRUE(throughput.has_value());
EXPECT_NEAR(throughput.value().bytes_per_sec<double>(), 100 * 1000.0,
0.05 * 100 * 1000.0); // Allow 5% error
// Delay spike
recv_clock += TimeDelta::Millis(40);
// Faster delivery after the gap
recv_increment = TimeDelta::Millis(2);
packet_feedback =
CreateFeedbackVector(5, packet_size, send_increment, recv_increment,
&send_clock, &recv_clock, &sequence_number);
throughput_estimator.IncomingPacketFeedbackVector(packet_feedback);
throughput = throughput_estimator.bitrate();
EXPECT_TRUE(throughput.has_value());
EXPECT_NEAR(throughput.value().bytes_per_sec<double>(), 100 * 1000.0,
0.05 * 100 * 1000.0); // Allow 5% error
// Delivery at normal rate. This will be capped by the send rate.
recv_increment = TimeDelta::Millis(10);
packet_feedback =
CreateFeedbackVector(5, packet_size, send_increment, recv_increment,
&send_clock, &recv_clock, &sequence_number);
throughput_estimator.IncomingPacketFeedbackVector(packet_feedback);
throughput = throughput_estimator.bitrate();
EXPECT_TRUE(throughput.has_value());
EXPECT_NEAR(throughput.value().bytes_per_sec<double>(), 100 * 1000.0,
0.05 * 100 * 1000.0); // Allow 5% error
}
TEST(RobustThroughputEstimatorTest, CappedByReceiveRate) {
webrtc::test::ScopedFieldTrials field_trials(
"WebRTC-Bwe-RobustThroughputEstimatorSettings/"
"enabled:true,assume_shared_link:false,reduce_bias:true,min_packets:10,"
"window_duration:100ms/");
FieldTrialBasedConfig field_trial_config;
RobustThroughputEstimatorSettings settings(&field_trial_config);
RobustThroughputEstimator throughput_estimator(settings);
DataSize packet_size(DataSize::Bytes(1000));
Timestamp send_clock(Timestamp::Millis(100000));
Timestamp recv_clock(Timestamp::Millis(10000));
TimeDelta send_increment(TimeDelta::Millis(10));
TimeDelta recv_increment(TimeDelta::Millis(40));
uint16_t sequence_number = 100;
std::vector<PacketResult> packet_feedback =
CreateFeedbackVector(20, packet_size, send_increment, recv_increment,
&send_clock, &recv_clock, &sequence_number);
throughput_estimator.IncomingPacketFeedbackVector(packet_feedback);
auto throughput = throughput_estimator.bitrate();
EXPECT_TRUE(throughput.has_value());
EXPECT_NEAR(throughput.value().bytes_per_sec<double>(), 25 * 1000.0,
0.05 * 25 * 1000.0); // Allow 5% error
}
TEST(RobustThroughputEstimatorTest, CappedBySendRate) {
webrtc::test::ScopedFieldTrials field_trials(
"WebRTC-Bwe-RobustThroughputEstimatorSettings/"
"enabled:true,assume_shared_link:false,reduce_bias:true,min_packets:10,"
"window_duration:100ms/");
FieldTrialBasedConfig field_trial_config;
RobustThroughputEstimatorSettings settings(&field_trial_config);
RobustThroughputEstimator throughput_estimator(settings);
DataSize packet_size(DataSize::Bytes(1000));
Timestamp send_clock(Timestamp::Millis(100000));
Timestamp recv_clock(Timestamp::Millis(10000));
TimeDelta send_increment(TimeDelta::Millis(20));
TimeDelta recv_increment(TimeDelta::Millis(10));
uint16_t sequence_number = 100;
std::vector<PacketResult> packet_feedback =
CreateFeedbackVector(20, packet_size, send_increment, recv_increment,
&send_clock, &recv_clock, &sequence_number);
throughput_estimator.IncomingPacketFeedbackVector(packet_feedback);
auto throughput = throughput_estimator.bitrate();
EXPECT_TRUE(throughput.has_value());
EXPECT_NEAR(throughput.value().bytes_per_sec<double>(), 50 * 1000.0,
0.05 * 50 * 1000.0); // Allow 5% error
}
} // namespace webrtc*/