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9de4ef4b24
Negative infinity is useful in comparisons as it represents a value guaranteed to be less than any other timestamp. This avoid using Timestamp::ms(0) to represent such a value or having to use optional for the special case of first time execution. To avoid ambiguity, Timestamp::Infinity is renamed to PlusInfinity. Bug: webrtc:9709 Change-Id: Ib2debff91036e94d1dc903ec0c6faae30febde4e Reviewed-on: https://webrtc-review.googlesource.com/79440 Commit-Queue: Sebastian Jansson <srte@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#24556}
103 lines
4.1 KiB
C++
103 lines
4.1 KiB
C++
/*
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* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <vector>
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#include "modules/congestion_controller/pcc/utility_function.h"
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#include "test/gtest.h"
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namespace webrtc {
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namespace pcc {
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namespace test {
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namespace {
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constexpr double kLossCoefficient = 11.35;
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constexpr double kThroughputPower = 0.9;
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constexpr double kThroughputCoefficient = 1;
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constexpr double kDelayGradientNegativeBound = 10;
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const Timestamp kStartTime = Timestamp::us(0);
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const TimeDelta kPacketsDelta = TimeDelta::ms(1);
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const TimeDelta kIntervalDuration = TimeDelta::ms(100);
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const DataRate kSendingBitrate = DataRate::bps(1000);
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const DataSize kDefaultDataSize = DataSize::bytes(100);
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const TimeDelta kDefaultDelay = TimeDelta::ms(100);
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std::vector<PacketResult> CreatePacketResults(
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const std::vector<Timestamp>& packets_send_times,
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const std::vector<Timestamp>& packets_received_times = {},
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const std::vector<DataSize>& packets_sizes = {}) {
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std::vector<PacketResult> packet_results;
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PacketResult packet_result;
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SentPacket sent_packet;
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for (size_t i = 0; i < packets_send_times.size(); ++i) {
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sent_packet.send_time = packets_send_times[i];
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if (packets_sizes.empty()) {
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sent_packet.size = kDefaultDataSize;
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} else {
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sent_packet.size = packets_sizes[i];
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}
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packet_result.sent_packet = sent_packet;
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if (packets_received_times.empty()) {
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packet_result.receive_time = packets_send_times[i] + kDefaultDelay;
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} else {
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packet_result.receive_time = packets_received_times[i];
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}
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packet_results.push_back(packet_result);
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}
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return packet_results;
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}
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} // namespace
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TEST(PccVivaceUtilityFunctionTest,
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UtilityIsThroughputTermIfAllRestCoefficientsAreZero) {
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VivaceUtilityFunction utility_function(0, 0, kThroughputCoefficient,
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kThroughputPower, 0,
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kDelayGradientNegativeBound);
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PccMonitorInterval monitor_interval(kSendingBitrate, kStartTime,
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kIntervalDuration);
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monitor_interval.OnPacketsFeedback(CreatePacketResults(
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{kStartTime + kPacketsDelta, kStartTime + 2 * kPacketsDelta,
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kStartTime + 3 * kPacketsDelta, kStartTime + 2 * kIntervalDuration},
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{kStartTime + kPacketsDelta + kDefaultDelay, Timestamp::PlusInfinity(),
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kStartTime + kDefaultDelay + 3 * kPacketsDelta,
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Timestamp::PlusInfinity()},
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{kDefaultDataSize, kDefaultDataSize, kDefaultDataSize,
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kDefaultDataSize}));
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EXPECT_DOUBLE_EQ(utility_function.Compute(monitor_interval),
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kThroughputCoefficient *
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std::pow(kSendingBitrate.bps(), kThroughputPower));
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}
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TEST(PccVivaceUtilityFunctionTest,
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LossTermIsNonZeroIfLossCoefficientIsNonZero) {
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VivaceUtilityFunction utility_function(
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0, kLossCoefficient, kThroughputCoefficient, kThroughputPower, 0,
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kDelayGradientNegativeBound);
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PccMonitorInterval monitor_interval(kSendingBitrate, kStartTime,
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kIntervalDuration);
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monitor_interval.OnPacketsFeedback(CreatePacketResults(
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{kStartTime + kPacketsDelta, kStartTime + 2 * kPacketsDelta,
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kStartTime + 5 * kPacketsDelta, kStartTime + 2 * kIntervalDuration},
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{kStartTime + kDefaultDelay, Timestamp::PlusInfinity(),
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kStartTime + kDefaultDelay, kStartTime + 3 * kIntervalDuration},
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{}));
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// The second packet was lost.
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EXPECT_DOUBLE_EQ(utility_function.Compute(monitor_interval),
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kThroughputCoefficient *
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std::pow(kSendingBitrate.bps(), kThroughputPower) -
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kLossCoefficient * kSendingBitrate.bps() *
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monitor_interval.GetLossRate());
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}
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} // namespace test
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} // namespace pcc
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} // namespace webrtc
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