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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}
70 lines
2.3 KiB
C++
70 lines
2.3 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 "modules/congestion_controller/pcc/rtt_tracker.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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const TimeDelta kInitialRtt = TimeDelta::us(10);
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constexpr double kAlpha = 0.9;
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const Timestamp kStartTime = Timestamp::seconds(0);
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PacketResult GetPacketWithRtt(TimeDelta rtt) {
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SentPacket packet;
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packet.send_time = kStartTime;
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PacketResult packet_result;
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packet_result.sent_packet = packet;
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if (rtt.IsFinite()) {
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packet_result.receive_time = kStartTime + rtt;
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} else {
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packet_result.receive_time = Timestamp::PlusInfinity();
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}
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return packet_result;
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}
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} // namespace
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TEST(PccRttTrackerTest, InitialValue) {
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RttTracker tracker{kInitialRtt, kAlpha};
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EXPECT_EQ(kInitialRtt, tracker.GetRtt());
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for (int i = 0; i < 100; ++i) {
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tracker.OnPacketsFeedback({GetPacketWithRtt(kInitialRtt)},
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kStartTime + kInitialRtt);
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}
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EXPECT_EQ(kInitialRtt, tracker.GetRtt());
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}
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TEST(PccRttTrackerTest, DoNothingWhenPacketIsLost) {
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RttTracker tracker{kInitialRtt, kAlpha};
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tracker.OnPacketsFeedback({GetPacketWithRtt(TimeDelta::PlusInfinity())},
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kStartTime + kInitialRtt);
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EXPECT_EQ(tracker.GetRtt(), kInitialRtt);
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}
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TEST(PccRttTrackerTest, ChangeInRtt) {
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RttTracker tracker{kInitialRtt, kAlpha};
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const TimeDelta kNewRtt = TimeDelta::us(100);
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tracker.OnPacketsFeedback({GetPacketWithRtt(kNewRtt)}, kStartTime + kNewRtt);
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EXPECT_GT(tracker.GetRtt(), kInitialRtt);
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EXPECT_LE(tracker.GetRtt(), kNewRtt);
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for (int i = 0; i < 100; ++i) {
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tracker.OnPacketsFeedback({GetPacketWithRtt(kNewRtt)},
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kStartTime + kNewRtt);
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}
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const TimeDelta absolute_error = TimeDelta::us(1);
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EXPECT_NEAR(tracker.GetRtt().us(), kNewRtt.us(), absolute_error.us());
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EXPECT_LE(tracker.GetRtt(), kNewRtt);
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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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