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https://github.com/mollyim/webrtc.git
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aa71259b06
Trigger probes next process intervals if the loss based current state is either increasing or decreasing. 0/ first probe at the loss based estimate. 1/ if increasing: allow further probing. 2/ if decreasing: not allow further probing. Bug: webrtc:12707 Change-Id: I4e99edcbe4e2c315e8498ffb7fb2e589cdb4e666 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/279041 Commit-Queue: Diep Bui <diepbp@webrtc.org> Reviewed-by: Per Kjellander <perkj@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38395}
1115 lines
47 KiB
C++
1115 lines
47 KiB
C++
/*
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* Copyright (c) 2016 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/goog_cc/probe_controller.h"
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#include <memory>
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#include "api/units/data_rate.h"
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#include "api/units/time_delta.h"
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#include "api/units/timestamp.h"
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#include "logging/rtc_event_log/mock/mock_rtc_event_log.h"
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#include "rtc_base/logging.h"
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#include "system_wrappers/include/clock.h"
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#include "test/explicit_key_value_config.h"
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#include "test/gmock.h"
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#include "test/gtest.h"
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using ::testing::NiceMock;
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namespace webrtc {
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namespace test {
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namespace {
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constexpr DataRate kMinBitrate = DataRate::BitsPerSec(100);
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constexpr DataRate kStartBitrate = DataRate::BitsPerSec(300);
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constexpr DataRate kMaxBitrate = DataRate::BitsPerSec(10000);
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constexpr TimeDelta kExponentialProbingTimeout = TimeDelta::Seconds(5);
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constexpr TimeDelta kAlrProbeInterval = TimeDelta::Seconds(5);
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constexpr TimeDelta kAlrEndedTimeout = TimeDelta::Seconds(3);
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constexpr TimeDelta kBitrateDropTimeout = TimeDelta::Seconds(5);
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} // namespace
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class ProbeControllerFixture {
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public:
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explicit ProbeControllerFixture(absl::string_view field_trials = "")
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: field_trial_config_(field_trials), clock_(100000000L) {}
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std::unique_ptr<ProbeController> CreateController() {
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return std::make_unique<ProbeController>(&field_trial_config_,
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&mock_rtc_event_log);
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}
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Timestamp CurrentTime() { return clock_.CurrentTime(); }
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void AdvanceTime(TimeDelta delta) { clock_.AdvanceTime(delta); }
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ExplicitKeyValueConfig field_trial_config_;
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SimulatedClock clock_;
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NiceMock<MockRtcEventLog> mock_rtc_event_log;
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};
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TEST(ProbeControllerTest, InitiatesProbingAtStart) {
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ProbeControllerFixture fixture;
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std::unique_ptr<ProbeController> probe_controller =
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fixture.CreateController();
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auto probes = probe_controller->SetBitrates(
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kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
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EXPECT_GE(probes.size(), 2u);
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}
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TEST(ProbeControllerTest, SetsDefaultTargetDurationAndTargetProbeCount) {
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ProbeControllerFixture fixture;
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std::unique_ptr<ProbeController> probe_controller =
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fixture.CreateController();
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std::vector<ProbeClusterConfig> probes = probe_controller->SetBitrates(
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kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
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ASSERT_GE(probes.size(), 2u);
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EXPECT_EQ(probes[0].target_duration, TimeDelta::Millis(15));
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EXPECT_EQ(probes[0].target_probe_count, 5);
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}
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TEST(ProbeControllerTest,
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FieldTrialsOverrideDefaultTargetDurationAndTargetProbeCount) {
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ProbeControllerFixture fixture(
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"WebRTC-Bwe-ProbingBehavior/"
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"min_probe_packets_sent:2,min_probe_duration:123ms/");
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std::unique_ptr<ProbeController> probe_controller =
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fixture.CreateController();
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std::vector<ProbeClusterConfig> probes = probe_controller->SetBitrates(
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kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
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ASSERT_GE(probes.size(), 2u);
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EXPECT_EQ(probes[0].target_duration, TimeDelta::Millis(123));
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EXPECT_EQ(probes[0].target_probe_count, 2);
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}
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TEST(ProbeControllerTest, ProbeOnlyWhenNetworkIsUp) {
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ProbeControllerFixture fixture;
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std::unique_ptr<ProbeController> probe_controller =
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fixture.CreateController();
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auto probes = probe_controller->OnNetworkAvailability(
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{.at_time = fixture.CurrentTime(), .network_available = false});
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probes = probe_controller->SetBitrates(kMinBitrate, kStartBitrate,
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kMaxBitrate, fixture.CurrentTime());
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EXPECT_TRUE(probes.empty());
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probes = probe_controller->OnNetworkAvailability(
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{.at_time = fixture.CurrentTime(), .network_available = true});
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EXPECT_GE(probes.size(), 2u);
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}
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TEST(ProbeControllerTest, CanConfigureInitialProbeRateFactor) {
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ProbeControllerFixture fixture("WebRTC-Bwe-ProbingConfiguration/p1:2,p2:3/");
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std::unique_ptr<ProbeController> probe_controller =
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fixture.CreateController();
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auto probes = probe_controller->SetBitrates(
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kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
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EXPECT_EQ(probes.size(), 2u);
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EXPECT_EQ(probes[0].target_data_rate, kStartBitrate * 2);
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EXPECT_EQ(probes[1].target_data_rate, kStartBitrate * 3);
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}
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TEST(ProbeControllerTest, DisableSecondInitialProbeIfRateFactorZero) {
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ProbeControllerFixture fixture("WebRTC-Bwe-ProbingConfiguration/p1:2,p2:0/");
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std::unique_ptr<ProbeController> probe_controller =
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fixture.CreateController();
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auto probes = probe_controller->SetBitrates(
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kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
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EXPECT_EQ(probes.size(), 1u);
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EXPECT_EQ(probes[0].target_data_rate, kStartBitrate * 2);
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}
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TEST(ProbeControllerTest, InitiatesProbingOnMaxBitrateIncrease) {
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ProbeControllerFixture fixture;
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std::unique_ptr<ProbeController> probe_controller =
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fixture.CreateController();
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auto probes = probe_controller->SetBitrates(
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kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
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// Long enough to time out exponential probing.
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fixture.AdvanceTime(kExponentialProbingTimeout);
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probes = probe_controller->SetEstimatedBitrate(
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kStartBitrate, BandwidthLimitedCause::kDelayBasedLimited,
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fixture.CurrentTime());
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probes = probe_controller->Process(fixture.CurrentTime());
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probes = probe_controller->SetBitrates(
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kMinBitrate, kStartBitrate, kMaxBitrate + DataRate::BitsPerSec(100),
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fixture.CurrentTime());
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EXPECT_EQ(probes.size(), 1u);
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EXPECT_EQ(probes[0].target_data_rate.bps(), kMaxBitrate.bps() + 100);
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}
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TEST(ProbeControllerTest, ProbesOnMaxBitrateIncreaseOnlyWhenInAlr) {
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ProbeControllerFixture fixture;
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std::unique_ptr<ProbeController> probe_controller =
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fixture.CreateController();
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auto probes = probe_controller->SetBitrates(
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kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
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probes = probe_controller->SetEstimatedBitrate(
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kMaxBitrate - DataRate::BitsPerSec(1),
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BandwidthLimitedCause::kDelayBasedLimited, fixture.CurrentTime());
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// Wait long enough to time out exponential probing.
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fixture.AdvanceTime(kExponentialProbingTimeout);
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probes = probe_controller->Process(fixture.CurrentTime());
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EXPECT_TRUE(probes.empty());
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// Probe when in alr.
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probe_controller->SetAlrStartTimeMs(fixture.CurrentTime().ms());
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probes = probe_controller->OnMaxTotalAllocatedBitrate(
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kMaxBitrate + DataRate::BitsPerSec(1), fixture.CurrentTime());
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EXPECT_EQ(probes.size(), 2u);
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EXPECT_EQ(probes.at(0).target_data_rate, kMaxBitrate);
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// Do not probe when not in alr.
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probe_controller->SetAlrStartTimeMs(absl::nullopt);
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probes = probe_controller->OnMaxTotalAllocatedBitrate(
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kMaxBitrate + DataRate::BitsPerSec(2), fixture.CurrentTime());
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EXPECT_TRUE(probes.empty());
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}
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TEST(ProbeControllerTest, InitiatesProbingOnMaxBitrateIncreaseAtMaxBitrate) {
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ProbeControllerFixture fixture;
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std::unique_ptr<ProbeController> probe_controller =
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fixture.CreateController();
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auto probes = probe_controller->SetBitrates(
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kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
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// Long enough to time out exponential probing.
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fixture.AdvanceTime(kExponentialProbingTimeout);
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probes = probe_controller->SetEstimatedBitrate(
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kStartBitrate, BandwidthLimitedCause::kDelayBasedLimited,
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fixture.CurrentTime());
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probes = probe_controller->Process(fixture.CurrentTime());
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probes = probe_controller->SetEstimatedBitrate(
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kMaxBitrate, BandwidthLimitedCause::kDelayBasedLimited,
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fixture.CurrentTime());
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probes = probe_controller->SetBitrates(
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kMinBitrate, kStartBitrate, kMaxBitrate + DataRate::BitsPerSec(100),
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fixture.CurrentTime());
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EXPECT_EQ(probes.size(), 1u);
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EXPECT_EQ(probes[0].target_data_rate,
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kMaxBitrate + DataRate::BitsPerSec(100));
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}
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TEST(ProbeControllerTest, TestExponentialProbing) {
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ProbeControllerFixture fixture;
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std::unique_ptr<ProbeController> probe_controller =
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fixture.CreateController();
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auto probes = probe_controller->SetBitrates(
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kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
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// Repeated probe should only be sent when estimated bitrate climbs above
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// 0.7 * 6 * kStartBitrate = 1260.
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probes = probe_controller->SetEstimatedBitrate(
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DataRate::BitsPerSec(1000), BandwidthLimitedCause::kDelayBasedLimited,
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fixture.CurrentTime());
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EXPECT_TRUE(probes.empty());
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probes = probe_controller->SetEstimatedBitrate(
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DataRate::BitsPerSec(1800), BandwidthLimitedCause::kDelayBasedLimited,
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fixture.CurrentTime());
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EXPECT_EQ(probes.size(), 1u);
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EXPECT_EQ(probes[0].target_data_rate.bps(), 2 * 1800);
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}
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TEST(ProbeControllerTest, TestExponentialProbingTimeout) {
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ProbeControllerFixture fixture;
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std::unique_ptr<ProbeController> probe_controller =
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fixture.CreateController();
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auto probes = probe_controller->SetBitrates(
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kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
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// Advance far enough to cause a time out in waiting for probing result.
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fixture.AdvanceTime(kExponentialProbingTimeout);
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probes = probe_controller->Process(fixture.CurrentTime());
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probes = probe_controller->SetEstimatedBitrate(
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DataRate::BitsPerSec(1800), BandwidthLimitedCause::kDelayBasedLimited,
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fixture.CurrentTime());
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EXPECT_TRUE(probes.empty());
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}
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TEST(ProbeControllerTest, RequestProbeInAlr) {
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ProbeControllerFixture fixture;
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std::unique_ptr<ProbeController> probe_controller =
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fixture.CreateController();
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auto probes = probe_controller->SetBitrates(
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kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
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EXPECT_GE(probes.size(), 2u);
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probes = probe_controller->SetEstimatedBitrate(
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DataRate::BitsPerSec(500), BandwidthLimitedCause::kDelayBasedLimited,
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fixture.CurrentTime());
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probe_controller->SetAlrStartTimeMs(fixture.CurrentTime().ms());
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fixture.AdvanceTime(kAlrProbeInterval + TimeDelta::Millis(1));
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probes = probe_controller->Process(fixture.CurrentTime());
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probes = probe_controller->SetEstimatedBitrate(
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DataRate::BitsPerSec(250), BandwidthLimitedCause::kDelayBasedLimited,
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fixture.CurrentTime());
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probes = probe_controller->RequestProbe(fixture.CurrentTime());
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EXPECT_EQ(probes.size(), 1u);
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EXPECT_EQ(probes[0].target_data_rate.bps(), 0.85 * 500);
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}
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TEST(ProbeControllerTest, RequestProbeWhenAlrEndedRecently) {
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ProbeControllerFixture fixture;
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std::unique_ptr<ProbeController> probe_controller =
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fixture.CreateController();
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auto probes = probe_controller->SetBitrates(
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kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
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EXPECT_EQ(probes.size(), 2u);
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probes = probe_controller->SetEstimatedBitrate(
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DataRate::BitsPerSec(500), BandwidthLimitedCause::kDelayBasedLimited,
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fixture.CurrentTime());
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probe_controller->SetAlrStartTimeMs(absl::nullopt);
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fixture.AdvanceTime(kAlrProbeInterval + TimeDelta::Millis(1));
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probes = probe_controller->Process(fixture.CurrentTime());
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probes = probe_controller->SetEstimatedBitrate(
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DataRate::BitsPerSec(250), BandwidthLimitedCause::kDelayBasedLimited,
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fixture.CurrentTime());
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probe_controller->SetAlrEndedTimeMs(fixture.CurrentTime().ms());
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fixture.AdvanceTime(kAlrEndedTimeout - TimeDelta::Millis(1));
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probes = probe_controller->RequestProbe(fixture.CurrentTime());
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EXPECT_EQ(probes.size(), 1u);
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EXPECT_EQ(probes[0].target_data_rate.bps(), 0.85 * 500);
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}
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TEST(ProbeControllerTest, RequestProbeWhenAlrNotEndedRecently) {
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ProbeControllerFixture fixture;
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std::unique_ptr<ProbeController> probe_controller =
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fixture.CreateController();
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auto probes = probe_controller->SetBitrates(
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kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
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EXPECT_EQ(probes.size(), 2u);
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probes = probe_controller->SetEstimatedBitrate(
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DataRate::BitsPerSec(500), BandwidthLimitedCause::kDelayBasedLimited,
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fixture.CurrentTime());
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probe_controller->SetAlrStartTimeMs(absl::nullopt);
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fixture.AdvanceTime(kAlrProbeInterval + TimeDelta::Millis(1));
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probes = probe_controller->Process(fixture.CurrentTime());
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probes = probe_controller->SetEstimatedBitrate(
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DataRate::BitsPerSec(250), BandwidthLimitedCause::kDelayBasedLimited,
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fixture.CurrentTime());
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probe_controller->SetAlrEndedTimeMs(fixture.CurrentTime().ms());
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fixture.AdvanceTime(kAlrEndedTimeout + TimeDelta::Millis(1));
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probes = probe_controller->RequestProbe(fixture.CurrentTime());
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EXPECT_TRUE(probes.empty());
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}
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TEST(ProbeControllerTest, RequestProbeWhenBweDropNotRecent) {
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ProbeControllerFixture fixture;
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std::unique_ptr<ProbeController> probe_controller =
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fixture.CreateController();
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auto probes = probe_controller->SetBitrates(
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kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
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EXPECT_EQ(probes.size(), 2u);
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probes = probe_controller->SetEstimatedBitrate(
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DataRate::BitsPerSec(500), BandwidthLimitedCause::kDelayBasedLimited,
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fixture.CurrentTime());
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probe_controller->SetAlrStartTimeMs(fixture.CurrentTime().ms());
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fixture.AdvanceTime(kAlrProbeInterval + TimeDelta::Millis(1));
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probes = probe_controller->Process(fixture.CurrentTime());
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probes = probe_controller->SetEstimatedBitrate(
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DataRate::BitsPerSec(250), BandwidthLimitedCause::kDelayBasedLimited,
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fixture.CurrentTime());
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fixture.AdvanceTime(kBitrateDropTimeout + TimeDelta::Millis(1));
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probes = probe_controller->RequestProbe(fixture.CurrentTime());
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EXPECT_TRUE(probes.empty());
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}
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TEST(ProbeControllerTest, PeriodicProbing) {
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ProbeControllerFixture fixture;
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std::unique_ptr<ProbeController> probe_controller =
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fixture.CreateController();
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probe_controller->EnablePeriodicAlrProbing(true);
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auto probes = probe_controller->SetBitrates(
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kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
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EXPECT_EQ(probes.size(), 2u);
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probes = probe_controller->SetEstimatedBitrate(
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DataRate::BitsPerSec(500), BandwidthLimitedCause::kDelayBasedLimited,
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fixture.CurrentTime());
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Timestamp start_time = fixture.CurrentTime();
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// Expect the controller to send a new probe after 5s has passed.
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probe_controller->SetAlrStartTimeMs(start_time.ms());
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fixture.AdvanceTime(TimeDelta::Seconds(5));
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probes = probe_controller->Process(fixture.CurrentTime());
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EXPECT_EQ(probes.size(), 1u);
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EXPECT_EQ(probes[0].target_data_rate.bps(), 1000);
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probes = probe_controller->SetEstimatedBitrate(
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DataRate::BitsPerSec(500), BandwidthLimitedCause::kDelayBasedLimited,
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fixture.CurrentTime());
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// The following probe should be sent at 10s into ALR.
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probe_controller->SetAlrStartTimeMs(start_time.ms());
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fixture.AdvanceTime(TimeDelta::Seconds(4));
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probes = probe_controller->Process(fixture.CurrentTime());
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probes = probe_controller->SetEstimatedBitrate(
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DataRate::BitsPerSec(500), BandwidthLimitedCause::kDelayBasedLimited,
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fixture.CurrentTime());
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EXPECT_TRUE(probes.empty());
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probe_controller->SetAlrStartTimeMs(start_time.ms());
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fixture.AdvanceTime(TimeDelta::Seconds(1));
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probes = probe_controller->Process(fixture.CurrentTime());
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EXPECT_EQ(probes.size(), 1u);
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probes = probe_controller->SetEstimatedBitrate(
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DataRate::BitsPerSec(500), BandwidthLimitedCause::kDelayBasedLimited,
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fixture.CurrentTime());
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EXPECT_TRUE(probes.empty());
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}
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TEST(ProbeControllerTest, PeriodicProbingAfterReset) {
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ProbeControllerFixture fixture;
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std::unique_ptr<ProbeController> probe_controller =
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fixture.CreateController();
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Timestamp alr_start_time = fixture.CurrentTime();
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probe_controller->SetAlrStartTimeMs(alr_start_time.ms());
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probe_controller->EnablePeriodicAlrProbing(true);
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auto probes = probe_controller->SetBitrates(
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kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
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probe_controller->Reset(fixture.CurrentTime());
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fixture.AdvanceTime(TimeDelta::Seconds(10));
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probes = probe_controller->Process(fixture.CurrentTime());
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// Since bitrates are not yet set, no probe is sent event though we are in ALR
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// mode.
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EXPECT_TRUE(probes.empty());
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probes = probe_controller->SetBitrates(kMinBitrate, kStartBitrate,
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kMaxBitrate, fixture.CurrentTime());
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EXPECT_EQ(probes.size(), 2u);
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// Make sure we use `kStartBitrateBps` as the estimated bitrate
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// until SetEstimatedBitrate is called with an updated estimate.
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fixture.AdvanceTime(TimeDelta::Seconds(10));
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probes = probe_controller->Process(fixture.CurrentTime());
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EXPECT_EQ(probes.size(), 1u);
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EXPECT_EQ(probes[0].target_data_rate, kStartBitrate * 2);
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}
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TEST(ProbeControllerTest, TestExponentialProbingOverflow) {
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ProbeControllerFixture fixture;
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std::unique_ptr<ProbeController> probe_controller =
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fixture.CreateController();
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const DataRate kMbpsMultiplier = DataRate::KilobitsPerSec(1000);
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auto probes = probe_controller->SetBitrates(kMinBitrate, 10 * kMbpsMultiplier,
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100 * kMbpsMultiplier,
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fixture.CurrentTime());
|
|
// Verify that probe bitrate is capped at the specified max bitrate.
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
60 * kMbpsMultiplier, BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
EXPECT_EQ(probes.size(), 1u);
|
|
EXPECT_EQ(probes[0].target_data_rate, 100 * kMbpsMultiplier);
|
|
// Verify that repeated probes aren't sent.
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
100 * kMbpsMultiplier, BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
}
|
|
|
|
TEST(ProbeControllerTest, TestAllocatedBitrateCap) {
|
|
ProbeControllerFixture fixture;
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
const DataRate kMbpsMultiplier = DataRate::KilobitsPerSec(1000);
|
|
const DataRate kMaxBitrate = 100 * kMbpsMultiplier;
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, 10 * kMbpsMultiplier, kMaxBitrate, fixture.CurrentTime());
|
|
|
|
// Configure ALR for periodic probing.
|
|
probe_controller->EnablePeriodicAlrProbing(true);
|
|
Timestamp alr_start_time = fixture.CurrentTime();
|
|
probe_controller->SetAlrStartTimeMs(alr_start_time.ms());
|
|
|
|
DataRate estimated_bitrate = kMaxBitrate / 10;
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
estimated_bitrate, BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
|
|
// Set a max allocated bitrate below the current estimate.
|
|
DataRate max_allocated = estimated_bitrate - 1 * kMbpsMultiplier;
|
|
probes = probe_controller->OnMaxTotalAllocatedBitrate(max_allocated,
|
|
fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty()); // No probe since lower than current max.
|
|
|
|
// Probes such as ALR capped at 2x the max allocation limit.
|
|
fixture.AdvanceTime(TimeDelta::Seconds(5));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_EQ(probes.size(), 1u);
|
|
EXPECT_EQ(probes[0].target_data_rate, 2 * max_allocated);
|
|
|
|
// Remove allocation limit.
|
|
EXPECT_TRUE(
|
|
probe_controller
|
|
->OnMaxTotalAllocatedBitrate(DataRate::Zero(), fixture.CurrentTime())
|
|
.empty());
|
|
fixture.AdvanceTime(TimeDelta::Seconds(5));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_EQ(probes.size(), 1u);
|
|
EXPECT_EQ(probes[0].target_data_rate, estimated_bitrate * 2);
|
|
}
|
|
|
|
TEST(ProbeControllerTest, ConfigurableProbingFieldTrial) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"p1:2,p2:5,step_size:3,further_probe_threshold:0.8,"
|
|
"alloc_p1:2,alloc_p2,min_probe_packets_sent:2/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
|
|
auto probes = probe_controller->SetBitrates(kMinBitrate, kStartBitrate,
|
|
DataRate::KilobitsPerSec(5000),
|
|
fixture.CurrentTime());
|
|
EXPECT_EQ(probes.size(), 2u);
|
|
EXPECT_EQ(probes[0].target_data_rate.bps(), 600);
|
|
EXPECT_EQ(probes[0].target_probe_count, 2);
|
|
EXPECT_EQ(probes[1].target_data_rate.bps(), 1500);
|
|
EXPECT_EQ(probes[1].target_probe_count, 2);
|
|
|
|
// Repeated probe should only be sent when estimated bitrate climbs above
|
|
// 0.8 * 5 * kStartBitrateBps = 1200.
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
DataRate::BitsPerSec(1100), BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
EXPECT_EQ(probes.size(), 0u);
|
|
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
DataRate::BitsPerSec(1250), BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
EXPECT_EQ(probes.size(), 1u);
|
|
EXPECT_EQ(probes[0].target_data_rate.bps(), 3 * 1250);
|
|
|
|
fixture.AdvanceTime(TimeDelta::Seconds(5));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
|
|
probe_controller->SetAlrStartTimeMs(fixture.CurrentTime().ms());
|
|
probes = probe_controller->OnMaxTotalAllocatedBitrate(
|
|
DataRate::KilobitsPerSec(200), fixture.CurrentTime());
|
|
EXPECT_EQ(probes.size(), 1u);
|
|
EXPECT_EQ(probes[0].target_data_rate.bps(), 400'000);
|
|
}
|
|
|
|
TEST(ProbeControllerTest, LimitAlrProbeWhenLossBasedBweLimited) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"limit_probe_target_rate_to_loss_bwe:true/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
probe_controller->EnablePeriodicAlrProbing(true);
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
DataRate::BitsPerSec(500), BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
// Expect the controller to send a new probe after 5s has passed.
|
|
probe_controller->SetAlrStartTimeMs(fixture.CurrentTime().ms());
|
|
fixture.AdvanceTime(TimeDelta::Seconds(5));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
ASSERT_EQ(probes.size(), 1u);
|
|
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
DataRate::BitsPerSec(500),
|
|
BandwidthLimitedCause::kLossLimitedBweDecreasing, fixture.CurrentTime());
|
|
fixture.AdvanceTime(TimeDelta::Seconds(6));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
ASSERT_EQ(probes.size(), 1u);
|
|
EXPECT_EQ(probes[0].target_data_rate, DataRate::BitsPerSec(500));
|
|
}
|
|
|
|
TEST(ProbeControllerTest, PeriodicProbeAtUpperNetworkStateEstimate) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/network_state_interval:5s/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
DataRate::BitsPerSec(5000), BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
// Expect the controller to send a new probe after 5s has passed.
|
|
NetworkStateEstimate state_estimate;
|
|
state_estimate.link_capacity_upper = DataRate::KilobitsPerSec(6);
|
|
probe_controller->SetNetworkStateEstimate(state_estimate);
|
|
|
|
fixture.AdvanceTime(TimeDelta::Seconds(5));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
ASSERT_EQ(probes.size(), 1u);
|
|
EXPECT_EQ(probes[0].target_data_rate, state_estimate.link_capacity_upper);
|
|
fixture.AdvanceTime(TimeDelta::Seconds(5));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
ASSERT_EQ(probes.size(), 1u);
|
|
EXPECT_EQ(probes[0].target_data_rate, state_estimate.link_capacity_upper);
|
|
}
|
|
|
|
TEST(ProbeControllerTest,
|
|
LimitProbeAtUpperNetworkStateEstimateIfLossBasedLimited) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"network_state_interval:5s,limit_probe_target_rate_to_loss_bwe:true/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
DataRate::BitsPerSec(500), BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
// Expect the controller to send a new probe after 5s has passed.
|
|
NetworkStateEstimate state_estimate;
|
|
state_estimate.link_capacity_upper = DataRate::KilobitsPerSec(600);
|
|
probe_controller->SetNetworkStateEstimate(state_estimate);
|
|
fixture.AdvanceTime(TimeDelta::Seconds(5));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
ASSERT_EQ(probes.size(), 1u);
|
|
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
DataRate::BitsPerSec(500),
|
|
BandwidthLimitedCause::kLossLimitedBweDecreasing, fixture.CurrentTime());
|
|
// Expect the controller to send a new probe after 5s has passed.
|
|
fixture.AdvanceTime(TimeDelta::Seconds(5));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
ASSERT_FALSE(probes.empty());
|
|
EXPECT_EQ(probes[0].target_data_rate, DataRate::BitsPerSec(500));
|
|
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
DataRate::BitsPerSec(500), BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
fixture.AdvanceTime(TimeDelta::Seconds(5));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
ASSERT_FALSE(probes.empty());
|
|
EXPECT_GT(probes[0].target_data_rate, DataRate::BitsPerSec(500));
|
|
}
|
|
|
|
TEST(ProbeControllerTest, AlrProbesLimitedByNetworkStateEstimate) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/network_state_interval:5s/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
probe_controller->EnablePeriodicAlrProbing(true);
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
DataRate::KilobitsPerSec(6), BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
probe_controller->SetAlrStartTimeMs(fixture.CurrentTime().ms());
|
|
|
|
fixture.AdvanceTime(TimeDelta::Seconds(5));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
ASSERT_EQ(probes.size(), 1u);
|
|
EXPECT_EQ(probes[0].target_data_rate, kMaxBitrate);
|
|
|
|
NetworkStateEstimate state_estimate;
|
|
state_estimate.link_capacity_upper = DataRate::BitsPerSec(8000);
|
|
probe_controller->SetNetworkStateEstimate(state_estimate);
|
|
fixture.AdvanceTime(TimeDelta::Seconds(5));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
ASSERT_EQ(probes.size(), 1u);
|
|
EXPECT_EQ(probes[0].target_data_rate, state_estimate.link_capacity_upper);
|
|
}
|
|
|
|
TEST(ProbeControllerTest, CanSetLongerProbeDurationAfterNetworkStateEstimate) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"network_state_interval:5s,network_state_probe_duration:100ms/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
DataRate::KilobitsPerSec(5), BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
ASSERT_FALSE(probes.empty());
|
|
EXPECT_LT(probes[0].target_duration, TimeDelta::Millis(100));
|
|
|
|
NetworkStateEstimate state_estimate;
|
|
state_estimate.link_capacity_upper = DataRate::KilobitsPerSec(6);
|
|
probe_controller->SetNetworkStateEstimate(state_estimate);
|
|
fixture.AdvanceTime(TimeDelta::Seconds(5));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
ASSERT_EQ(probes.size(), 1u);
|
|
EXPECT_EQ(probes[0].target_duration, TimeDelta::Millis(100));
|
|
}
|
|
|
|
TEST(ProbeControllerTest, ProbeAfterLargeNetworkStateIncrease) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"network_state_interval:5s,network_state_fast_rampup_rate:2.0/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
kStartBitrate, BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
// Need to wait at least one second before process can trigger a new probe.
|
|
fixture.AdvanceTime(TimeDelta::Millis(1100));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
NetworkStateEstimate state_estimate;
|
|
state_estimate.link_capacity_upper = kStartBitrate;
|
|
probe_controller->SetNetworkStateEstimate(state_estimate);
|
|
// No probe since NetworkStateEstimate is not higher than the set
|
|
// estimated bitrate.
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
// If NetworkState increase just a bit, dont expect the probe to be sent
|
|
// immediately.
|
|
state_estimate.link_capacity_upper = kStartBitrate * 1.4;
|
|
probe_controller->SetNetworkStateEstimate(state_estimate);
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
// If NetworkState increase dramatically, expect a probe to be sent.
|
|
state_estimate.link_capacity_upper = kStartBitrate * 1.4 * 2;
|
|
probe_controller->SetNetworkStateEstimate(state_estimate);
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_EQ(probes.size(), 1u);
|
|
}
|
|
|
|
TEST(ProbeControllerTest, ProbeAfterLargeNetworkStateDrop) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"network_state_interval:5s,network_state_drop_down_rate:0.5/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
kStartBitrate, BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
// Need to wait at least one second before process can trigger a new probe.
|
|
fixture.AdvanceTime(TimeDelta::Millis(1100));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
NetworkStateEstimate state_estimate;
|
|
state_estimate.link_capacity_upper = kStartBitrate;
|
|
probe_controller->SetNetworkStateEstimate(state_estimate);
|
|
// No probe since NetworkStateEstimate is not lower than the set
|
|
// estimated bitrate.
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
// If NetworkState decrease just a bit, dont expect the probe to be sent
|
|
// immediately.
|
|
state_estimate.link_capacity_upper = kStartBitrate * 0.9;
|
|
probe_controller->SetNetworkStateEstimate(state_estimate);
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
// If NetworkState decrease dramatically, expect a probe to be sent.
|
|
state_estimate.link_capacity_upper = kStartBitrate * 0.9 * 0.5;
|
|
probe_controller->SetNetworkStateEstimate(state_estimate);
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_EQ(probes.size(), 1u);
|
|
}
|
|
|
|
TEST(ProbeControllerTest, ProbeAfterLargeNetworkStateDropLossLimited) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"network_state_interval:5s,network_state_drop_down_rate:0.5,limit_probe_"
|
|
"target_rate_to_loss_bwe:true/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
kStartBitrate, BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
// Need to wait at least one second before process can trigger a new probe.
|
|
fixture.AdvanceTime(TimeDelta::Millis(1100));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
NetworkStateEstimate state_estimate;
|
|
state_estimate.link_capacity_upper = kStartBitrate;
|
|
probe_controller->SetNetworkStateEstimate(state_estimate);
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
// Loss limited.
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
kStartBitrate / 3, BandwidthLimitedCause::kLossLimitedBweDecreasing,
|
|
fixture.CurrentTime());
|
|
// If NetworkState decrease dramatically, expect a probe to be sent.
|
|
// But limited to loss based estimate.
|
|
state_estimate.link_capacity_upper = kStartBitrate / 2;
|
|
probe_controller->SetNetworkStateEstimate(state_estimate);
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
ASSERT_EQ(probes.size(), 1u);
|
|
EXPECT_EQ(probes[0].target_data_rate, kStartBitrate / 3);
|
|
}
|
|
|
|
TEST(ProbeControllerTest,
|
|
ProbesAtEstimatedBitrateWhenInAlrIfLossBasedIncreasing) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"limit_probe_target_rate_to_loss_bwe:true/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
probe_controller->EnablePeriodicAlrProbing(true);
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
kStartBitrate, BandwidthLimitedCause::kLossLimitedBweIncreasing,
|
|
fixture.CurrentTime());
|
|
|
|
// Wait long enough to time out exponential probing.
|
|
fixture.AdvanceTime(kExponentialProbingTimeout);
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
// Probe when in alr.
|
|
probe_controller->SetAlrStartTimeMs(fixture.CurrentTime().ms());
|
|
fixture.AdvanceTime(kAlrProbeInterval + TimeDelta::Millis(1));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_EQ(probes.size(), 1u);
|
|
EXPECT_EQ(probes.at(0).target_data_rate, kStartBitrate);
|
|
}
|
|
|
|
TEST(ProbeControllerTest, ProbesFurtherWhenInAlrIfLossBasedIncreasing) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"limit_probe_target_rate_to_loss_bwe:true/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
probe_controller->EnablePeriodicAlrProbing(true);
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
kStartBitrate, BandwidthLimitedCause::kLossLimitedBweIncreasing,
|
|
fixture.CurrentTime());
|
|
|
|
// Wait long enough to time out exponential probing.
|
|
fixture.AdvanceTime(kExponentialProbingTimeout);
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
// Probe when in alr.
|
|
probe_controller->SetAlrStartTimeMs(fixture.CurrentTime().ms());
|
|
fixture.AdvanceTime(kAlrProbeInterval + TimeDelta::Millis(1));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_EQ(probes.size(), 1u);
|
|
EXPECT_EQ(probes.at(0).target_data_rate, kStartBitrate);
|
|
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
kStartBitrate, BandwidthLimitedCause::kLossLimitedBweIncreasing,
|
|
fixture.CurrentTime());
|
|
EXPECT_EQ(probes.size(), 1u);
|
|
EXPECT_EQ(probes[0].target_data_rate, 2 * kStartBitrate);
|
|
}
|
|
|
|
TEST(ProbeControllerTest, NotProbeFurtherWhenInAlrIfLossBasedDecreases) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"network_state_interval:5s,network_state_drop_down_rate:0.5,limit_probe_"
|
|
"target_rate_to_loss_bwe:true/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
probe_controller->EnablePeriodicAlrProbing(true);
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
kStartBitrate, BandwidthLimitedCause::kLossLimitedBweDecreasing,
|
|
fixture.CurrentTime());
|
|
|
|
// Wait long enough to time out exponential probing.
|
|
fixture.AdvanceTime(kExponentialProbingTimeout);
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
// Probe when in alr.
|
|
probe_controller->SetAlrStartTimeMs(fixture.CurrentTime().ms());
|
|
fixture.AdvanceTime(kAlrProbeInterval + TimeDelta::Millis(1));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_EQ(probes.size(), 1u);
|
|
EXPECT_EQ(probes.at(0).target_data_rate, kStartBitrate);
|
|
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
kStartBitrate, BandwidthLimitedCause::kLossLimitedBweDecreasing,
|
|
fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
}
|
|
|
|
TEST(ProbeControllerTest, NotProbeIfLossBasedIncreasingOutsideAlr) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"limit_probe_target_rate_to_loss_bwe:true/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
probe_controller->EnablePeriodicAlrProbing(true);
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
kStartBitrate, BandwidthLimitedCause::kLossLimitedBweIncreasing,
|
|
fixture.CurrentTime());
|
|
|
|
// Wait long enough to time out exponential probing.
|
|
fixture.AdvanceTime(kExponentialProbingTimeout);
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
probe_controller->SetAlrStartTimeMs(absl::nullopt);
|
|
fixture.AdvanceTime(kAlrProbeInterval + TimeDelta::Millis(1));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
}
|
|
|
|
TEST(ProbeControllerTest, ProbeFurtherWhenLossBasedIncreases) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"network_state_interval:5s,limit_probe_target_rate_to_loss_bwe:true/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
ASSERT_FALSE(probes.empty());
|
|
|
|
// Need to wait at least one second before process can trigger a new probe.
|
|
fixture.AdvanceTime(TimeDelta::Millis(1100));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
NetworkStateEstimate state_estimate;
|
|
state_estimate.link_capacity_upper = 5 * kStartBitrate;
|
|
probe_controller->SetNetworkStateEstimate(state_estimate);
|
|
fixture.AdvanceTime(TimeDelta::Seconds(5));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_FALSE(probes.empty());
|
|
|
|
DataRate probe_target_rate = probes[0].target_data_rate;
|
|
EXPECT_LT(probe_target_rate, state_estimate.link_capacity_upper);
|
|
// Expect that more probes are sent if BWE is increasing.
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
probe_target_rate, BandwidthLimitedCause::kLossLimitedBweIncreasing,
|
|
fixture.CurrentTime());
|
|
EXPECT_FALSE(probes.empty());
|
|
EXPECT_EQ(probes[0].target_data_rate, 2 * probe_target_rate);
|
|
}
|
|
|
|
TEST(ProbeControllerTest, ProbeFurtherWhenLossBasedIsSameAsDelayBasedEstimate) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"network_state_interval:5s,limit_probe_target_rate_to_loss_bwe:true/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
ASSERT_FALSE(probes.empty());
|
|
|
|
// Need to wait at least one second before process can trigger a new probe.
|
|
fixture.AdvanceTime(TimeDelta::Millis(1100));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
NetworkStateEstimate state_estimate;
|
|
state_estimate.link_capacity_upper = 5 * kStartBitrate;
|
|
probe_controller->SetNetworkStateEstimate(state_estimate);
|
|
fixture.AdvanceTime(TimeDelta::Seconds(5));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_FALSE(probes.empty());
|
|
|
|
DataRate probe_target_rate = probes[0].target_data_rate;
|
|
EXPECT_LT(probe_target_rate, state_estimate.link_capacity_upper);
|
|
// Expect that more probes are sent if BWE is the same as delay based
|
|
// estimate.
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
probe_target_rate, BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
EXPECT_FALSE(probes.empty());
|
|
EXPECT_EQ(probes[0].target_data_rate, 2 * probe_target_rate);
|
|
}
|
|
|
|
TEST(ProbeControllerTest, DontProbeFurtherWhenLossBasedDecreases) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"network_state_interval:5s,limit_probe_target_rate_to_loss_bwe:true/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
ASSERT_FALSE(probes.empty());
|
|
|
|
// Need to wait at least one second before process can trigger a new probe.
|
|
fixture.AdvanceTime(TimeDelta::Millis(1100));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
NetworkStateEstimate state_estimate;
|
|
state_estimate.link_capacity_upper = 3 * kStartBitrate;
|
|
probe_controller->SetNetworkStateEstimate(state_estimate);
|
|
fixture.AdvanceTime(TimeDelta::Seconds(5));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_FALSE(probes.empty());
|
|
EXPECT_LT(probes[0].target_data_rate, state_estimate.link_capacity_upper);
|
|
// Expect that no more probes are sent immediately if BWE is loss limited.
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
probes[0].target_data_rate,
|
|
BandwidthLimitedCause::kLossLimitedBweDecreasing, fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
}
|
|
|
|
TEST(ProbeControllerTest, ProbeFurtherWhenDelayBasedLimited) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"network_state_interval:5s,limit_probe_target_rate_to_loss_bwe:true/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
ASSERT_FALSE(probes.empty());
|
|
|
|
// Need to wait at least one second before process can trigger a new probe.
|
|
fixture.AdvanceTime(TimeDelta::Millis(1100));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
NetworkStateEstimate state_estimate;
|
|
state_estimate.link_capacity_upper = 3 * kStartBitrate;
|
|
probe_controller->SetNetworkStateEstimate(state_estimate);
|
|
fixture.AdvanceTime(TimeDelta::Seconds(5));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_FALSE(probes.empty());
|
|
EXPECT_LT(probes[0].target_data_rate, state_estimate.link_capacity_upper);
|
|
// Since the probe was successfull, expect to continue probing.
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
probes[0].target_data_rate, BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
EXPECT_FALSE(probes.empty());
|
|
EXPECT_EQ(probes[0].target_data_rate, state_estimate.link_capacity_upper);
|
|
}
|
|
|
|
TEST(ProbeControllerTest, SkipAlrProbeIfEstimateLargerThanMaxProbe) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"skip_if_est_larger_than_fraction_of_max:0.9/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
probe_controller->EnablePeriodicAlrProbing(true);
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
ASSERT_FALSE(probes.empty());
|
|
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
kMaxBitrate, BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
probe_controller->SetAlrStartTimeMs(fixture.CurrentTime().ms());
|
|
fixture.AdvanceTime(TimeDelta::Seconds(10));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
// But if the max rate increase, A new probe is sent.
|
|
probe_controller->SetMaxBitrate(2 * kMaxBitrate);
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_FALSE(probes.empty());
|
|
}
|
|
|
|
TEST(ProbeControllerTest, SkipNetworkStateProbeIfEstimateLargerThanMaxProbe) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"network_state_interval:2s,skip_if_est_larger_than_fraction_of_max:0.9/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
ASSERT_FALSE(probes.empty());
|
|
|
|
probe_controller->SetNetworkStateEstimate(
|
|
{.link_capacity_upper = 2 * kMaxBitrate});
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
kMaxBitrate, BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
fixture.AdvanceTime(TimeDelta::Seconds(10));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
}
|
|
|
|
TEST(ProbeControllerTest, SendsProbeIfNetworkStateEstimateLowerThanMaxProbe) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"network_state_interval:2s,skip_if_est_larger_than_fraction_of_max:0.9,"
|
|
"network_state_drop_down_rate:0.5/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
ASSERT_FALSE(probes.empty());
|
|
probe_controller->SetNetworkStateEstimate(
|
|
{.link_capacity_upper = 2 * kMaxBitrate});
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
kMaxBitrate, BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
|
|
// Need to wait at least one second before process can trigger a new probe.
|
|
fixture.AdvanceTime(TimeDelta::Millis(1100));
|
|
|
|
// Sends a probe immediately if NetworkState estimate decrease.
|
|
probe_controller->SetNetworkStateEstimate(
|
|
{.link_capacity_upper = kStartBitrate});
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_FALSE(probes.empty());
|
|
}
|
|
|
|
TEST(ProbeControllerTest, DontSendProbeIfNetworkStateEstimateIsZero) {
|
|
ProbeControllerFixture fixture(
|
|
"WebRTC-Bwe-ProbingConfiguration/"
|
|
"network_state_interval:5s,network_state_drop_down_rate:0.5,limit_probe_"
|
|
"target_rate_to_loss_bwe:true/");
|
|
std::unique_ptr<ProbeController> probe_controller =
|
|
fixture.CreateController();
|
|
auto probes = probe_controller->SetBitrates(
|
|
kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
|
|
probes = probe_controller->SetEstimatedBitrate(
|
|
kStartBitrate, BandwidthLimitedCause::kDelayBasedLimited,
|
|
fixture.CurrentTime());
|
|
probe_controller->SetNetworkStateEstimate(
|
|
{.link_capacity_upper = kStartBitrate});
|
|
// Need to wait at least one second before process can trigger a new probe.
|
|
fixture.AdvanceTime(TimeDelta::Millis(1100));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
ASSERT_TRUE(probes.empty());
|
|
|
|
probe_controller->SetNetworkStateEstimate(
|
|
{.link_capacity_upper = DataRate::Zero()});
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
fixture.AdvanceTime(TimeDelta::Seconds(6));
|
|
probes = probe_controller->Process(fixture.CurrentTime());
|
|
EXPECT_TRUE(probes.empty());
|
|
}
|
|
} // namespace test
|
|
} // namespace webrtc
|