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/*
* Copyright (c) 2018 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/pcc/utility_function.h"
#include <stddef.h>
#include <cmath>
#include <type_traits>
#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 "test/gtest.h"
namespace webrtc {
namespace pcc {
namespace test {
namespace {
constexpr double kLossCoefficient = 11.35;
constexpr double kThroughputPower = 0.9;
constexpr double kThroughputCoefficient = 1;
constexpr double kDelayGradientNegativeBound = 10;
const Timestamp kStartTime = Timestamp::Micros(0);
const TimeDelta kPacketsDelta = TimeDelta::Millis(1);
const TimeDelta kIntervalDuration = TimeDelta::Millis(100);
const DataRate kSendingBitrate = DataRate::BitsPerSec(1000);
const DataSize kDefaultDataSize = DataSize::Bytes(100);
const TimeDelta kDefaultDelay = TimeDelta::Millis(100);
std::vector<PacketResult> CreatePacketResults(
const std::vector<Timestamp>& packets_send_times,
const std::vector<Timestamp>& packets_received_times = {},
const std::vector<DataSize>& packets_sizes = {}) {
std::vector<PacketResult> packet_results;
PacketResult packet_result;
SentPacket sent_packet;
for (size_t i = 0; i < packets_send_times.size(); ++i) {
sent_packet.send_time = packets_send_times[i];
if (packets_sizes.empty()) {
sent_packet.size = kDefaultDataSize;
} else {
sent_packet.size = packets_sizes[i];
}
packet_result.sent_packet = sent_packet;
if (packets_received_times.empty()) {
packet_result.receive_time = packets_send_times[i] + kDefaultDelay;
} else {
packet_result.receive_time = packets_received_times[i];
}
packet_results.push_back(packet_result);
}
return packet_results;
}
} // namespace
TEST(PccVivaceUtilityFunctionTest,
UtilityIsThroughputTermIfAllRestCoefficientsAreZero) {
VivaceUtilityFunction utility_function(0, 0, kThroughputCoefficient,
kThroughputPower, 0,
kDelayGradientNegativeBound);
PccMonitorInterval monitor_interval(kSendingBitrate, kStartTime,
kIntervalDuration);
monitor_interval.OnPacketsFeedback(CreatePacketResults(
{kStartTime + kPacketsDelta, kStartTime + 2 * kPacketsDelta,
kStartTime + 3 * kPacketsDelta, kStartTime + 2 * kIntervalDuration},
{kStartTime + kPacketsDelta + kDefaultDelay, Timestamp::PlusInfinity(),
kStartTime + kDefaultDelay + 3 * kPacketsDelta,
Timestamp::PlusInfinity()},
{kDefaultDataSize, kDefaultDataSize, kDefaultDataSize,
kDefaultDataSize}));
EXPECT_DOUBLE_EQ(utility_function.Compute(monitor_interval),
kThroughputCoefficient *
std::pow(kSendingBitrate.bps(), kThroughputPower));
}
TEST(PccVivaceUtilityFunctionTest,
LossTermIsNonZeroIfLossCoefficientIsNonZero) {
VivaceUtilityFunction utility_function(
0, kLossCoefficient, kThroughputCoefficient, kThroughputPower, 0,
kDelayGradientNegativeBound);
PccMonitorInterval monitor_interval(kSendingBitrate, kStartTime,
kIntervalDuration);
monitor_interval.OnPacketsFeedback(CreatePacketResults(
{kStartTime + kPacketsDelta, kStartTime + 2 * kPacketsDelta,
kStartTime + 5 * kPacketsDelta, kStartTime + 2 * kIntervalDuration},
{kStartTime + kDefaultDelay, Timestamp::PlusInfinity(),
kStartTime + kDefaultDelay, kStartTime + 3 * kIntervalDuration},
{}));
// The second packet was lost.
EXPECT_DOUBLE_EQ(utility_function.Compute(monitor_interval),
kThroughputCoefficient *
std::pow(kSendingBitrate.bps(), kThroughputPower) -
kLossCoefficient * kSendingBitrate.bps() *
monitor_interval.GetLossRate());
}
} // namespace test
} // namespace pcc
} // namespace webrtc
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