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88af20356f
Instead of using field trials in BitrateProber for probe duration, use values provided in ProbeClusterConfig from GoogCC. Field trials are instead read in ProbeController. To avoid having to do a thread jump for every ProbeClusterConfig, RtpPacketPacer interface is changed to RtpPacketPacer::CreateProbeClusters(std::vector<ProbeClusterConfig> Deprecates field trial "WebRTC-Bwe-ProbingConfiguration" Change-Id: I3991e4b54770601855a3af2d6a16678f11d41c31 Bug: webrtc:14027 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/261265 Reviewed-by: Erik Språng <sprang@webrtc.org> Commit-Queue: Per Kjellander <perkj@webrtc.org> Cr-Commit-Position: refs/heads/main@{#36911}
449 lines
18 KiB
C++
449 lines
18 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/transport/field_trial_based_config.h"
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#include "api/transport/network_types.h"
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#include "api/units/data_rate.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::_;
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using ::testing::AtLeast;
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using ::testing::Field;
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using ::testing::Matcher;
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using ::testing::NiceMock;
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using ::testing::Return;
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namespace webrtc {
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namespace test {
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namespace {
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constexpr int kMinBitrateBps = 100;
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constexpr int kStartBitrateBps = 300;
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constexpr int kMaxBitrateBps = 10000;
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constexpr int kExponentialProbingTimeoutMs = 5000;
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constexpr int kAlrProbeInterval = 5000;
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constexpr int kAlrEndedTimeoutMs = 3000;
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constexpr int kBitrateDropTimeoutMs = 5000;
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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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int64_t NowMs() { return clock_.TimeInMilliseconds(); }
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void AdvanceTimeMilliseconds(int64_t delta_ms) {
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clock_.AdvanceTimeMilliseconds(delta_ms);
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}
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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(kMinBitrateBps, kStartBitrateBps,
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kMaxBitrateBps, fixture.NowMs());
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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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kMinBitrateBps, kStartBitrateBps, kMaxBitrateBps, fixture.NowMs());
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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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kMinBitrateBps, kStartBitrateBps, kMaxBitrateBps, fixture.NowMs());
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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(kMinBitrateBps, kStartBitrateBps,
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kMaxBitrateBps, fixture.NowMs());
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EXPECT_EQ(probes.size(), 0u);
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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, 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(kMinBitrateBps, kStartBitrateBps,
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kMaxBitrateBps, fixture.NowMs());
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// Long enough to time out exponential probing.
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fixture.AdvanceTimeMilliseconds(kExponentialProbingTimeoutMs);
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probes =
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probe_controller->SetEstimatedBitrate(kStartBitrateBps, fixture.NowMs());
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probes = probe_controller->Process(fixture.NowMs());
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probes = probe_controller->SetBitrates(kMinBitrateBps, kStartBitrateBps,
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kMaxBitrateBps + 100, fixture.NowMs());
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EXPECT_EQ(probes.size(), 1u);
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EXPECT_EQ(probes[0].target_data_rate.bps(), kMaxBitrateBps + 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(kMinBitrateBps, kStartBitrateBps,
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kMaxBitrateBps, fixture.NowMs());
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probes = probe_controller->SetEstimatedBitrate(kMaxBitrateBps - 1,
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fixture.NowMs());
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// Wait long enough to time out exponential probing.
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fixture.AdvanceTimeMilliseconds(kExponentialProbingTimeoutMs);
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probes = probe_controller->Process(fixture.NowMs());
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EXPECT_EQ(probes.size(), 0u);
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// Probe when in alr.
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probe_controller->SetAlrStartTimeMs(fixture.NowMs());
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probes = probe_controller->OnMaxTotalAllocatedBitrate(kMaxBitrateBps + 1,
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fixture.NowMs());
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EXPECT_EQ(probes.size(), 2u);
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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(kMaxBitrateBps + 2,
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fixture.NowMs());
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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(kMinBitrateBps, kStartBitrateBps,
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kMaxBitrateBps, fixture.NowMs());
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// Long enough to time out exponential probing.
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fixture.AdvanceTimeMilliseconds(kExponentialProbingTimeoutMs);
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probes =
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probe_controller->SetEstimatedBitrate(kStartBitrateBps, fixture.NowMs());
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probes = probe_controller->Process(fixture.NowMs());
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probes =
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probe_controller->SetEstimatedBitrate(kMaxBitrateBps, fixture.NowMs());
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probes = probe_controller->SetBitrates(kMinBitrateBps, kStartBitrateBps,
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kMaxBitrateBps + 100, fixture.NowMs());
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EXPECT_EQ(probes.size(), 1u);
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EXPECT_EQ(probes[0].target_data_rate.bps(), kMaxBitrateBps + 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(kMinBitrateBps, kStartBitrateBps,
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kMaxBitrateBps, fixture.NowMs());
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// Repeated probe should only be sent when estimated bitrate climbs above
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// 0.7 * 6 * kStartBitrateBps = 1260.
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probes = probe_controller->SetEstimatedBitrate(1000, fixture.NowMs());
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EXPECT_EQ(probes.size(), 0u);
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probes = probe_controller->SetEstimatedBitrate(1800, fixture.NowMs());
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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(kMinBitrateBps, kStartBitrateBps,
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kMaxBitrateBps, fixture.NowMs());
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// Advance far enough to cause a time out in waiting for probing result.
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fixture.AdvanceTimeMilliseconds(kExponentialProbingTimeoutMs);
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probes = probe_controller->Process(fixture.NowMs());
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probes = probe_controller->SetEstimatedBitrate(1800, fixture.NowMs());
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EXPECT_EQ(probes.size(), 0u);
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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(kMinBitrateBps, kStartBitrateBps,
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kMaxBitrateBps, fixture.NowMs());
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EXPECT_GE(probes.size(), 2u);
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probes = probe_controller->SetEstimatedBitrate(500, fixture.NowMs());
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probe_controller->SetAlrStartTimeMs(fixture.NowMs());
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fixture.AdvanceTimeMilliseconds(kAlrProbeInterval + 1);
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probes = probe_controller->Process(fixture.NowMs());
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probes = probe_controller->SetEstimatedBitrate(250, fixture.NowMs());
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probes = probe_controller->RequestProbe(fixture.NowMs());
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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(kMinBitrateBps, kStartBitrateBps,
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kMaxBitrateBps, fixture.NowMs());
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EXPECT_EQ(probes.size(), 2u);
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probes = probe_controller->SetEstimatedBitrate(500, fixture.NowMs());
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probe_controller->SetAlrStartTimeMs(absl::nullopt);
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fixture.AdvanceTimeMilliseconds(kAlrProbeInterval + 1);
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probes = probe_controller->Process(fixture.NowMs());
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probes = probe_controller->SetEstimatedBitrate(250, fixture.NowMs());
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probe_controller->SetAlrEndedTimeMs(fixture.NowMs());
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fixture.AdvanceTimeMilliseconds(kAlrEndedTimeoutMs - 1);
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probes = probe_controller->RequestProbe(fixture.NowMs());
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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(kMinBitrateBps, kStartBitrateBps,
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kMaxBitrateBps, fixture.NowMs());
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EXPECT_EQ(probes.size(), 2u);
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probes = probe_controller->SetEstimatedBitrate(500, fixture.NowMs());
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probe_controller->SetAlrStartTimeMs(absl::nullopt);
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fixture.AdvanceTimeMilliseconds(kAlrProbeInterval + 1);
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probes = probe_controller->Process(fixture.NowMs());
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probes = probe_controller->SetEstimatedBitrate(250, fixture.NowMs());
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probe_controller->SetAlrEndedTimeMs(fixture.NowMs());
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fixture.AdvanceTimeMilliseconds(kAlrEndedTimeoutMs + 1);
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probes = probe_controller->RequestProbe(fixture.NowMs());
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EXPECT_EQ(probes.size(), 0u);
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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(kMinBitrateBps, kStartBitrateBps,
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kMaxBitrateBps, fixture.NowMs());
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EXPECT_EQ(probes.size(), 2u);
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probes = probe_controller->SetEstimatedBitrate(500, fixture.NowMs());
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probe_controller->SetAlrStartTimeMs(fixture.NowMs());
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fixture.AdvanceTimeMilliseconds(kAlrProbeInterval + 1);
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probes = probe_controller->Process(fixture.NowMs());
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probes = probe_controller->SetEstimatedBitrate(250, fixture.NowMs());
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fixture.AdvanceTimeMilliseconds(kBitrateDropTimeoutMs + 1);
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probes = probe_controller->RequestProbe(fixture.NowMs());
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EXPECT_EQ(probes.size(), 0u);
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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(kMinBitrateBps, kStartBitrateBps,
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kMaxBitrateBps, fixture.NowMs());
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EXPECT_EQ(probes.size(), 2u);
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probes = probe_controller->SetEstimatedBitrate(500, fixture.NowMs());
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int64_t start_time = fixture.NowMs();
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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);
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fixture.AdvanceTimeMilliseconds(5000);
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probes = probe_controller->Process(fixture.NowMs());
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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(500, fixture.NowMs());
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// The following probe should be sent at 10s into ALR.
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probe_controller->SetAlrStartTimeMs(start_time);
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fixture.AdvanceTimeMilliseconds(4000);
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probes = probe_controller->Process(fixture.NowMs());
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probes = probe_controller->SetEstimatedBitrate(500, fixture.NowMs());
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EXPECT_EQ(probes.size(), 0u);
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probe_controller->SetAlrStartTimeMs(start_time);
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fixture.AdvanceTimeMilliseconds(1000);
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probes = probe_controller->Process(fixture.NowMs());
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EXPECT_EQ(probes.size(), 1u);
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probes = probe_controller->SetEstimatedBitrate(500, fixture.NowMs());
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EXPECT_EQ(probes.size(), 0u);
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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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int64_t alr_start_time = fixture.NowMs();
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probe_controller->SetAlrStartTimeMs(alr_start_time);
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probe_controller->EnablePeriodicAlrProbing(true);
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auto probes = probe_controller->SetBitrates(kMinBitrateBps, kStartBitrateBps,
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kMaxBitrateBps, fixture.NowMs());
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probe_controller->Reset(fixture.NowMs());
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fixture.AdvanceTimeMilliseconds(10000);
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probes = probe_controller->Process(fixture.NowMs());
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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_EQ(probes.size(), 0u);
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probes = probe_controller->SetBitrates(kMinBitrateBps, kStartBitrateBps,
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kMaxBitrateBps, fixture.NowMs());
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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.AdvanceTimeMilliseconds(10000);
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probes = probe_controller->Process(fixture.NowMs());
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EXPECT_EQ(probes.size(), 1u);
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EXPECT_EQ(probes[0].target_data_rate.bps(), kStartBitrateBps * 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 int64_t kMbpsMultiplier = 1000000;
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auto probes =
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probe_controller->SetBitrates(kMinBitrateBps, 10 * kMbpsMultiplier,
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100 * kMbpsMultiplier, fixture.NowMs());
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// Verify that probe bitrate is capped at the specified max bitrate.
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probes = probe_controller->SetEstimatedBitrate(60 * kMbpsMultiplier,
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fixture.NowMs());
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EXPECT_EQ(probes.size(), 1u);
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EXPECT_EQ(probes[0].target_data_rate.bps(), 100 * kMbpsMultiplier);
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// Verify that repeated probes aren't sent.
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probes = probe_controller->SetEstimatedBitrate(100 * kMbpsMultiplier,
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fixture.NowMs());
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EXPECT_EQ(probes.size(), 0u);
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}
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TEST(ProbeControllerTest, TestAllocatedBitrateCap) {
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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 int64_t kMbpsMultiplier = 1000000;
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const int64_t kMaxBitrateBps = 100 * kMbpsMultiplier;
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auto probes = probe_controller->SetBitrates(
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kMinBitrateBps, 10 * kMbpsMultiplier, kMaxBitrateBps, fixture.NowMs());
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// Configure ALR for periodic probing.
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probe_controller->EnablePeriodicAlrProbing(true);
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int64_t alr_start_time = fixture.NowMs();
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probe_controller->SetAlrStartTimeMs(alr_start_time);
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int64_t estimated_bitrate_bps = kMaxBitrateBps / 10;
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probes = probe_controller->SetEstimatedBitrate(estimated_bitrate_bps,
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fixture.NowMs());
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// Set a max allocated bitrate below the current estimate.
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int64_t max_allocated_bps = estimated_bitrate_bps - 1 * kMbpsMultiplier;
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probes = probe_controller->OnMaxTotalAllocatedBitrate(max_allocated_bps,
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fixture.NowMs());
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EXPECT_TRUE(probes.empty()); // No probe since lower than current max.
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// Probes such as ALR capped at 2x the max allocation limit.
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fixture.AdvanceTimeMilliseconds(5000);
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probes = probe_controller->Process(fixture.NowMs());
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EXPECT_EQ(probes.size(), 1u);
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EXPECT_EQ(probes[0].target_data_rate.bps(), 2 * max_allocated_bps);
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// Remove allocation limit.
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EXPECT_TRUE(
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probe_controller->OnMaxTotalAllocatedBitrate(0, fixture.NowMs()).empty());
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fixture.AdvanceTimeMilliseconds(5000);
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probes = probe_controller->Process(fixture.NowMs());
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EXPECT_EQ(probes.size(), 1u);
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EXPECT_EQ(probes[0].target_data_rate.bps(), estimated_bitrate_bps * 2);
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}
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TEST(ProbeControllerTest, ConfigurableProbingFieldTrial) {
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ProbeControllerFixture fixture(
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"WebRTC-Bwe-ProbingConfiguration/"
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"p1:2,p2:5,step_size:3,further_probe_threshold:0.8,"
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"alloc_p1:2,alloc_p2/");
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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(kMinBitrateBps, kStartBitrateBps,
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5000000, fixture.NowMs());
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EXPECT_EQ(probes.size(), 2u);
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EXPECT_EQ(probes[0].target_data_rate.bps(), 600);
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EXPECT_EQ(probes[1].target_data_rate.bps(), 1500);
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|
|
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// Repeated probe should only be sent when estimated bitrate climbs above
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// 0.8 * 5 * kStartBitrateBps = 1200.
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probes = probe_controller->SetEstimatedBitrate(1100, fixture.NowMs());
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EXPECT_EQ(probes.size(), 0u);
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|
|
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probes = probe_controller->SetEstimatedBitrate(1250, fixture.NowMs());
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EXPECT_EQ(probes.size(), 1u);
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EXPECT_EQ(probes[0].target_data_rate.bps(), 3 * 1250);
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|
|
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fixture.AdvanceTimeMilliseconds(5000);
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probes = probe_controller->Process(fixture.NowMs());
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|
|
|
probe_controller->SetAlrStartTimeMs(fixture.NowMs());
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|
probes =
|
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probe_controller->OnMaxTotalAllocatedBitrate(200000, fixture.NowMs());
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EXPECT_EQ(probes.size(), 1u);
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EXPECT_EQ(probes[0].target_data_rate.bps(), 400000);
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|
}
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|
|
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} // namespace test
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} // namespace webrtc
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