| /* |
| * Copyright (c) 2019 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #include "modules/pacing/task_queue_paced_sender.h" |
| |
| #include <algorithm> |
| #include <atomic> |
| #include <list> |
| #include <memory> |
| #include <string> |
| #include <utility> |
| #include <vector> |
| |
| #include "absl/functional/any_invocable.h" |
| #include "api/task_queue/task_queue_base.h" |
| #include "api/transport/network_types.h" |
| #include "api/units/data_rate.h" |
| #include "modules/pacing/packet_router.h" |
| #include "test/gmock.h" |
| #include "test/gtest.h" |
| #include "test/scoped_key_value_config.h" |
| #include "test/time_controller/simulated_time_controller.h" |
| |
| using ::testing::_; |
| using ::testing::AtLeast; |
| using ::testing::Return; |
| using ::testing::SaveArg; |
| |
| namespace webrtc { |
| namespace { |
| constexpr uint32_t kAudioSsrc = 12345; |
| constexpr uint32_t kVideoSsrc = 234565; |
| constexpr uint32_t kVideoRtxSsrc = 34567; |
| constexpr uint32_t kFlexFecSsrc = 45678; |
| constexpr size_t kDefaultPacketSize = 1234; |
| |
| class MockPacketRouter : public PacketRouter { |
| public: |
| MOCK_METHOD(void, |
| SendPacket, |
| (std::unique_ptr<RtpPacketToSend> packet, |
| const PacedPacketInfo& cluster_info), |
| (override)); |
| MOCK_METHOD(std::vector<std::unique_ptr<RtpPacketToSend>>, |
| FetchFec, |
| (), |
| (override)); |
| MOCK_METHOD(std::vector<std::unique_ptr<RtpPacketToSend>>, |
| GeneratePadding, |
| (DataSize target_size), |
| (override)); |
| }; |
| |
| std::vector<std::unique_ptr<RtpPacketToSend>> GeneratePadding( |
| DataSize target_size) { |
| // 224 bytes is the max padding size for plain padding packets generated by |
| // RTPSender::GeneratePadding(). |
| const DataSize kMaxPaddingPacketSize = DataSize::Bytes(224); |
| DataSize padding_generated = DataSize::Zero(); |
| std::vector<std::unique_ptr<RtpPacketToSend>> padding_packets; |
| while (padding_generated < target_size) { |
| DataSize packet_size = |
| std::min(target_size - padding_generated, kMaxPaddingPacketSize); |
| padding_generated += packet_size; |
| auto padding_packet = |
| std::make_unique<RtpPacketToSend>(/*extensions=*/nullptr); |
| padding_packet->set_packet_type(RtpPacketMediaType::kPadding); |
| padding_packet->SetPadding(packet_size.bytes()); |
| padding_packets.push_back(std::move(padding_packet)); |
| } |
| return padding_packets; |
| } |
| |
| class TaskQueueWithFakePrecisionFactory : public TaskQueueFactory { |
| public: |
| explicit TaskQueueWithFakePrecisionFactory( |
| TaskQueueFactory* task_queue_factory) |
| : task_queue_factory_(task_queue_factory) {} |
| |
| std::unique_ptr<TaskQueueBase, TaskQueueDeleter> CreateTaskQueue( |
| absl::string_view name, |
| Priority priority) const override { |
| return std::unique_ptr<TaskQueueBase, TaskQueueDeleter>( |
| new TaskQueueWithFakePrecision( |
| const_cast<TaskQueueWithFakePrecisionFactory*>(this), |
| task_queue_factory_)); |
| } |
| |
| int delayed_low_precision_count() const { |
| return delayed_low_precision_count_; |
| } |
| int delayed_high_precision_count() const { |
| return delayed_high_precision_count_; |
| } |
| |
| private: |
| friend class TaskQueueWithFakePrecision; |
| |
| class TaskQueueWithFakePrecision : public TaskQueueBase { |
| public: |
| TaskQueueWithFakePrecision( |
| TaskQueueWithFakePrecisionFactory* parent_factory, |
| TaskQueueFactory* task_queue_factory) |
| : parent_factory_(parent_factory), |
| task_queue_(task_queue_factory->CreateTaskQueue( |
| "TaskQueueWithFakePrecision", |
| TaskQueueFactory::Priority::NORMAL)) {} |
| ~TaskQueueWithFakePrecision() override {} |
| |
| void Delete() override { |
| // `task_queue_->Delete()` is implicitly called in the destructor due to |
| // TaskQueueDeleter. |
| delete this; |
| } |
| void PostTask(absl::AnyInvocable<void() &&> task) override { |
| task_queue_->PostTask(WrapTask(std::move(task))); |
| } |
| void PostDelayedTask(absl::AnyInvocable<void() &&> task, |
| TimeDelta delay) override { |
| ++parent_factory_->delayed_low_precision_count_; |
| task_queue_->PostDelayedTask(WrapTask(std::move(task)), delay); |
| } |
| void PostDelayedHighPrecisionTask(absl::AnyInvocable<void() &&> task, |
| TimeDelta delay) override { |
| ++parent_factory_->delayed_high_precision_count_; |
| task_queue_->PostDelayedHighPrecisionTask(WrapTask(std::move(task)), |
| delay); |
| } |
| |
| private: |
| absl::AnyInvocable<void() &&> WrapTask(absl::AnyInvocable<void() &&> task) { |
| return [this, task = std::move(task)]() mutable { |
| CurrentTaskQueueSetter set_current(this); |
| std::move(task)(); |
| }; |
| } |
| |
| TaskQueueWithFakePrecisionFactory* parent_factory_; |
| std::unique_ptr<TaskQueueBase, TaskQueueDeleter> task_queue_; |
| }; |
| |
| TaskQueueFactory* task_queue_factory_; |
| std::atomic<int> delayed_low_precision_count_ = 0u; |
| std::atomic<int> delayed_high_precision_count_ = 0u; |
| }; |
| |
| } // namespace |
| |
| namespace test { |
| |
| std::unique_ptr<RtpPacketToSend> BuildRtpPacket(RtpPacketMediaType type) { |
| auto packet = std::make_unique<RtpPacketToSend>(nullptr); |
| packet->set_packet_type(type); |
| switch (type) { |
| case RtpPacketMediaType::kAudio: |
| packet->SetSsrc(kAudioSsrc); |
| break; |
| case RtpPacketMediaType::kVideo: |
| packet->SetSsrc(kVideoSsrc); |
| break; |
| case RtpPacketMediaType::kRetransmission: |
| case RtpPacketMediaType::kPadding: |
| packet->SetSsrc(kVideoRtxSsrc); |
| break; |
| case RtpPacketMediaType::kForwardErrorCorrection: |
| packet->SetSsrc(kFlexFecSsrc); |
| break; |
| } |
| |
| packet->SetPayloadSize(kDefaultPacketSize); |
| return packet; |
| } |
| |
| std::vector<std::unique_ptr<RtpPacketToSend>> GeneratePackets( |
| RtpPacketMediaType type, |
| size_t num_packets) { |
| std::vector<std::unique_ptr<RtpPacketToSend>> packets; |
| for (size_t i = 0; i < num_packets; ++i) { |
| packets.push_back(BuildRtpPacket(type)); |
| } |
| return packets; |
| } |
| |
| TEST(TaskQueuePacedSenderTest, PacesPackets) { |
| GlobalSimulatedTimeController time_controller(Timestamp::Millis(1234)); |
| MockPacketRouter packet_router; |
| ScopedKeyValueConfig trials; |
| TaskQueuePacedSender pacer(time_controller.GetClock(), &packet_router, trials, |
| time_controller.GetTaskQueueFactory(), |
| PacingController::kMinSleepTime, |
| TaskQueuePacedSender::kNoPacketHoldback); |
| |
| // Insert a number of packets, covering one second. |
| static constexpr size_t kPacketsToSend = 42; |
| pacer.SetPacingRates( |
| DataRate::BitsPerSec(kDefaultPacketSize * 8 * kPacketsToSend), |
| DataRate::Zero()); |
| pacer.EnsureStarted(); |
| pacer.EnqueuePackets( |
| GeneratePackets(RtpPacketMediaType::kVideo, kPacketsToSend)); |
| |
| // Expect all of them to be sent. |
| size_t packets_sent = 0; |
| Timestamp end_time = Timestamp::PlusInfinity(); |
| EXPECT_CALL(packet_router, SendPacket) |
| .WillRepeatedly([&](std::unique_ptr<RtpPacketToSend> packet, |
| const PacedPacketInfo& cluster_info) { |
| ++packets_sent; |
| if (packets_sent == kPacketsToSend) { |
| end_time = time_controller.GetClock()->CurrentTime(); |
| } |
| }); |
| |
| const Timestamp start_time = time_controller.GetClock()->CurrentTime(); |
| |
| // Packets should be sent over a period of close to 1s. Expect a little |
| // lower than this since initial probing is a bit quicker. |
| time_controller.AdvanceTime(TimeDelta::Seconds(1)); |
| EXPECT_EQ(packets_sent, kPacketsToSend); |
| ASSERT_TRUE(end_time.IsFinite()); |
| EXPECT_NEAR((end_time - start_time).ms<double>(), 1000.0, 50.0); |
| } |
| |
| TEST(TaskQueuePacedSenderTest, ReschedulesProcessOnRateChange) { |
| GlobalSimulatedTimeController time_controller(Timestamp::Millis(1234)); |
| MockPacketRouter packet_router; |
| ScopedKeyValueConfig trials; |
| TaskQueuePacedSender pacer(time_controller.GetClock(), &packet_router, trials, |
| time_controller.GetTaskQueueFactory(), |
| PacingController::kMinSleepTime, |
| TaskQueuePacedSender::kNoPacketHoldback); |
| |
| // Insert a number of packets to be sent 200ms apart. |
| const size_t kPacketsPerSecond = 5; |
| const DataRate kPacingRate = |
| DataRate::BitsPerSec(kDefaultPacketSize * 8 * kPacketsPerSecond); |
| pacer.SetPacingRates(kPacingRate, DataRate::Zero()); |
| pacer.EnsureStarted(); |
| |
| // Send some initial packets to be rid of any probes. |
| EXPECT_CALL(packet_router, SendPacket).Times(kPacketsPerSecond); |
| pacer.EnqueuePackets( |
| GeneratePackets(RtpPacketMediaType::kVideo, kPacketsPerSecond)); |
| time_controller.AdvanceTime(TimeDelta::Seconds(1)); |
| |
| // Insert three packets, and record send time of each of them. |
| // After the second packet is sent, double the send rate so we can |
| // check the third packets is sent after half the wait time. |
| Timestamp first_packet_time = Timestamp::MinusInfinity(); |
| Timestamp second_packet_time = Timestamp::MinusInfinity(); |
| Timestamp third_packet_time = Timestamp::MinusInfinity(); |
| |
| EXPECT_CALL(packet_router, SendPacket) |
| .Times(3) |
| .WillRepeatedly([&](std::unique_ptr<RtpPacketToSend> packet, |
| const PacedPacketInfo& cluster_info) { |
| if (first_packet_time.IsInfinite()) { |
| first_packet_time = time_controller.GetClock()->CurrentTime(); |
| } else if (second_packet_time.IsInfinite()) { |
| second_packet_time = time_controller.GetClock()->CurrentTime(); |
| pacer.SetPacingRates(2 * kPacingRate, DataRate::Zero()); |
| } else { |
| third_packet_time = time_controller.GetClock()->CurrentTime(); |
| } |
| }); |
| |
| pacer.EnqueuePackets(GeneratePackets(RtpPacketMediaType::kVideo, 3)); |
| time_controller.AdvanceTime(TimeDelta::Millis(500)); |
| ASSERT_TRUE(third_packet_time.IsFinite()); |
| EXPECT_NEAR((second_packet_time - first_packet_time).ms<double>(), 200.0, |
| 1.0); |
| EXPECT_NEAR((third_packet_time - second_packet_time).ms<double>(), 100.0, |
| 1.0); |
| } |
| |
| TEST(TaskQueuePacedSenderTest, SendsAudioImmediately) { |
| GlobalSimulatedTimeController time_controller(Timestamp::Millis(1234)); |
| MockPacketRouter packet_router; |
| ScopedKeyValueConfig trials; |
| TaskQueuePacedSender pacer(time_controller.GetClock(), &packet_router, trials, |
| time_controller.GetTaskQueueFactory(), |
| PacingController::kMinSleepTime, |
| TaskQueuePacedSender::kNoPacketHoldback); |
| |
| const DataRate kPacingDataRate = DataRate::KilobitsPerSec(125); |
| const DataSize kPacketSize = DataSize::Bytes(kDefaultPacketSize); |
| const TimeDelta kPacketPacingTime = kPacketSize / kPacingDataRate; |
| |
| pacer.SetPacingRates(kPacingDataRate, DataRate::Zero()); |
| pacer.EnsureStarted(); |
| |
| // Add some initial video packets, only one should be sent. |
| EXPECT_CALL(packet_router, SendPacket); |
| pacer.EnqueuePackets(GeneratePackets(RtpPacketMediaType::kVideo, 10)); |
| time_controller.AdvanceTime(TimeDelta::Zero()); |
| ::testing::Mock::VerifyAndClearExpectations(&packet_router); |
| |
| // Advance time, but still before next packet should be sent. |
| time_controller.AdvanceTime(kPacketPacingTime / 2); |
| |
| // Insert an audio packet, it should be sent immediately. |
| EXPECT_CALL(packet_router, SendPacket); |
| pacer.EnqueuePackets(GeneratePackets(RtpPacketMediaType::kAudio, 1)); |
| time_controller.AdvanceTime(TimeDelta::Zero()); |
| ::testing::Mock::VerifyAndClearExpectations(&packet_router); |
| } |
| |
| TEST(TaskQueuePacedSenderTest, SleepsDuringCoalscingWindow) { |
| const TimeDelta kCoalescingWindow = TimeDelta::Millis(5); |
| GlobalSimulatedTimeController time_controller(Timestamp::Millis(1234)); |
| MockPacketRouter packet_router; |
| ScopedKeyValueConfig trials; |
| TaskQueuePacedSender pacer(time_controller.GetClock(), &packet_router, trials, |
| time_controller.GetTaskQueueFactory(), |
| kCoalescingWindow, |
| TaskQueuePacedSender::kNoPacketHoldback); |
| |
| // Set rates so one packet adds one ms of buffer level. |
| const DataSize kPacketSize = DataSize::Bytes(kDefaultPacketSize); |
| const TimeDelta kPacketPacingTime = TimeDelta::Millis(1); |
| const DataRate kPacingDataRate = kPacketSize / kPacketPacingTime; |
| |
| pacer.SetPacingRates(kPacingDataRate, DataRate::Zero()); |
| pacer.EnsureStarted(); |
| |
| // Add 10 packets. The first should be sent immediately since the buffers |
| // are clear. |
| EXPECT_CALL(packet_router, SendPacket); |
| pacer.EnqueuePackets(GeneratePackets(RtpPacketMediaType::kVideo, 10)); |
| time_controller.AdvanceTime(TimeDelta::Zero()); |
| ::testing::Mock::VerifyAndClearExpectations(&packet_router); |
| |
| // Advance time to 1ms before the coalescing window ends. No packets should |
| // be sent. |
| EXPECT_CALL(packet_router, SendPacket).Times(0); |
| time_controller.AdvanceTime(kCoalescingWindow - TimeDelta::Millis(1)); |
| |
| // Advance time to where coalescing window ends. All packets that should |
| // have been sent up til now will be sent. |
| EXPECT_CALL(packet_router, SendPacket).Times(5); |
| time_controller.AdvanceTime(TimeDelta::Millis(1)); |
| ::testing::Mock::VerifyAndClearExpectations(&packet_router); |
| } |
| |
| TEST(TaskQueuePacedSenderTest, ProbingOverridesCoalescingWindow) { |
| const TimeDelta kCoalescingWindow = TimeDelta::Millis(5); |
| GlobalSimulatedTimeController time_controller(Timestamp::Millis(1234)); |
| MockPacketRouter packet_router; |
| ScopedKeyValueConfig trials; |
| TaskQueuePacedSender pacer(time_controller.GetClock(), &packet_router, trials, |
| time_controller.GetTaskQueueFactory(), |
| kCoalescingWindow, |
| TaskQueuePacedSender::kNoPacketHoldback); |
| |
| // Set rates so one packet adds one ms of buffer level. |
| const DataSize kPacketSize = DataSize::Bytes(kDefaultPacketSize); |
| const TimeDelta kPacketPacingTime = TimeDelta::Millis(1); |
| const DataRate kPacingDataRate = kPacketSize / kPacketPacingTime; |
| |
| pacer.SetPacingRates(kPacingDataRate, DataRate::Zero()); |
| pacer.EnsureStarted(); |
| |
| // Add 10 packets. The first should be sent immediately since the buffers |
| // are clear. This will also trigger the probe to start. |
| EXPECT_CALL(packet_router, SendPacket).Times(AtLeast(1)); |
| pacer.CreateProbeClusters( |
| {{.at_time = time_controller.GetClock()->CurrentTime(), |
| .target_data_rate = kPacingDataRate * 2, |
| .target_duration = TimeDelta::Millis(15), |
| .target_probe_count = 5, |
| .id = 17}}); |
| pacer.EnqueuePackets(GeneratePackets(RtpPacketMediaType::kVideo, 10)); |
| time_controller.AdvanceTime(TimeDelta::Zero()); |
| ::testing::Mock::VerifyAndClearExpectations(&packet_router); |
| |
| // Advance time to 1ms before the coalescing window ends. Packets should be |
| // flying. |
| EXPECT_CALL(packet_router, SendPacket).Times(AtLeast(1)); |
| time_controller.AdvanceTime(kCoalescingWindow - TimeDelta::Millis(1)); |
| } |
| |
| TEST(TaskQueuePacedSenderTest, SchedulesProbeAtSentTime) { |
| ScopedKeyValueConfig trials( |
| "WebRTC-Bwe-ProbingBehavior/min_probe_delta:1ms/"); |
| GlobalSimulatedTimeController time_controller(Timestamp::Millis(1234)); |
| MockPacketRouter packet_router; |
| TaskQueuePacedSender pacer(time_controller.GetClock(), &packet_router, trials, |
| time_controller.GetTaskQueueFactory(), |
| PacingController::kMinSleepTime, |
| TaskQueuePacedSender::kNoPacketHoldback); |
| |
| // Set rates so one packet adds 4ms of buffer level. |
| const DataSize kPacketSize = DataSize::Bytes(kDefaultPacketSize); |
| const TimeDelta kPacketPacingTime = TimeDelta::Millis(4); |
| const DataRate kPacingDataRate = kPacketSize / kPacketPacingTime; |
| pacer.SetPacingRates(kPacingDataRate, /*padding_rate=*/DataRate::Zero()); |
| pacer.EnsureStarted(); |
| EXPECT_CALL(packet_router, FetchFec).WillRepeatedly([]() { |
| return std::vector<std::unique_ptr<RtpPacketToSend>>(); |
| }); |
| EXPECT_CALL(packet_router, GeneratePadding(_)) |
| .WillRepeatedly( |
| [](DataSize target_size) { return GeneratePadding(target_size); }); |
| |
| // Enqueue two packets, only the first is sent immediately and the next |
| // will be scheduled for sending in 4ms. |
| pacer.EnqueuePackets(GeneratePackets(RtpPacketMediaType::kVideo, 2)); |
| const int kNotAProbe = PacedPacketInfo::kNotAProbe; |
| EXPECT_CALL(packet_router, |
| SendPacket(_, ::testing::Field(&PacedPacketInfo::probe_cluster_id, |
| kNotAProbe))); |
| // Advance to less than 3ms before next packet send time. |
| time_controller.AdvanceTime(TimeDelta::Micros(1001)); |
| |
| // Trigger a probe at 2x the current pacing rate and insert the number of |
| // packets the probe needs. |
| const DataRate kProbeRate = 2 * kPacingDataRate; |
| const int kProbeClusterId = 1; |
| pacer.CreateProbeClusters( |
| {{.at_time = time_controller.GetClock()->CurrentTime(), |
| .target_data_rate = kProbeRate, |
| .target_duration = TimeDelta::Millis(15), |
| .target_probe_count = 4, |
| .id = kProbeClusterId}}); |
| |
| // Expected size for each probe in a cluster is twice the expected bits sent |
| // during min_probe_delta. |
| // Expect one additional call since probe always starts with a small (1 byte) |
| // padding packet that's not counted into the probe rate here. |
| const TimeDelta kProbeTimeDelta = TimeDelta::Millis(2); |
| const DataSize kProbeSize = kProbeRate * kProbeTimeDelta; |
| const size_t kNumPacketsInProbe = |
| (kProbeSize + kPacketSize - DataSize::Bytes(1)) / kPacketSize; |
| EXPECT_CALL(packet_router, |
| SendPacket(_, ::testing::Field(&PacedPacketInfo::probe_cluster_id, |
| kProbeClusterId))) |
| .Times(kNumPacketsInProbe + 1); |
| |
| pacer.EnqueuePackets( |
| GeneratePackets(RtpPacketMediaType::kVideo, kNumPacketsInProbe)); |
| time_controller.AdvanceTime(TimeDelta::Zero()); |
| |
| // The pacer should have scheduled the next probe to be sent in |
| // kProbeTimeDelta. That there was existing scheduled call less than |
| // PacingController::kMinSleepTime before this should not matter. |
| EXPECT_CALL(packet_router, |
| SendPacket(_, ::testing::Field(&PacedPacketInfo::probe_cluster_id, |
| kProbeClusterId))) |
| .Times(AtLeast(1)); |
| time_controller.AdvanceTime(TimeDelta::Millis(2)); |
| } |
| |
| TEST(TaskQueuePacedSenderTest, NoMinSleepTimeWhenProbing) { |
| // Set min_probe_delta to be less than kMinSleepTime (1ms). |
| const TimeDelta kMinProbeDelta = TimeDelta::Micros(200); |
| ScopedKeyValueConfig trials( |
| "WebRTC-Bwe-ProbingBehavior/min_probe_delta:200us/"); |
| GlobalSimulatedTimeController time_controller(Timestamp::Millis(1234)); |
| MockPacketRouter packet_router; |
| TaskQueuePacedSender pacer(time_controller.GetClock(), &packet_router, trials, |
| time_controller.GetTaskQueueFactory(), |
| PacingController::kMinSleepTime, |
| TaskQueuePacedSender::kNoPacketHoldback); |
| |
| // Set rates so one packet adds 4ms of buffer level. |
| const DataSize kPacketSize = DataSize::Bytes(kDefaultPacketSize); |
| const TimeDelta kPacketPacingTime = TimeDelta::Millis(4); |
| const DataRate kPacingDataRate = kPacketSize / kPacketPacingTime; |
| pacer.SetPacingRates(kPacingDataRate, /*padding_rate=*/DataRate::Zero()); |
| pacer.EnsureStarted(); |
| EXPECT_CALL(packet_router, FetchFec).WillRepeatedly([]() { |
| return std::vector<std::unique_ptr<RtpPacketToSend>>(); |
| }); |
| EXPECT_CALL(packet_router, GeneratePadding) |
| .WillRepeatedly( |
| [](DataSize target_size) { return GeneratePadding(target_size); }); |
| |
| // Set a high probe rate. |
| const int kProbeClusterId = 1; |
| DataRate kProbingRate = kPacingDataRate * 10; |
| |
| pacer.CreateProbeClusters( |
| {{.at_time = time_controller.GetClock()->CurrentTime(), |
| .target_data_rate = kProbingRate, |
| .target_duration = TimeDelta::Millis(15), |
| .target_probe_count = 5, |
| .id = kProbeClusterId}}); |
| |
| // Advance time less than PacingController::kMinSleepTime, probing packets |
| // for the first millisecond should be sent immediately. Min delta between |
| // probes is 200us, meaning 4 times per ms we will get least one call to |
| // SendPacket(). |
| DataSize data_sent = DataSize::Zero(); |
| EXPECT_CALL(packet_router, |
| SendPacket(_, ::testing::Field(&PacedPacketInfo::probe_cluster_id, |
| kProbeClusterId))) |
| .Times(AtLeast(4)) |
| .WillRepeatedly([&](std::unique_ptr<RtpPacketToSend> packet, |
| const PacedPacketInfo&) { |
| data_sent += |
| DataSize::Bytes(packet->payload_size() + packet->padding_size()); |
| }); |
| |
| // Add one packet to kickstart probing, the rest will be padding packets. |
| pacer.EnqueuePackets(GeneratePackets(RtpPacketMediaType::kVideo, 1)); |
| time_controller.AdvanceTime(kMinProbeDelta); |
| |
| // Verify the amount of probing data sent. |
| // Probe always starts with a small (1 byte) padding packet that's not |
| // counted into the probe rate here. |
| const DataSize kMinProbeSize = kMinProbeDelta * kProbingRate; |
| EXPECT_EQ(data_sent, DataSize::Bytes(1) + kPacketSize + 4 * kMinProbeSize); |
| } |
| |
| TEST(TaskQueuePacedSenderTest, PacketBasedCoalescing) { |
| const TimeDelta kFixedCoalescingWindow = TimeDelta::Millis(10); |
| const int kPacketBasedHoldback = 5; |
| |
| GlobalSimulatedTimeController time_controller(Timestamp::Millis(1234)); |
| MockPacketRouter packet_router; |
| ScopedKeyValueConfig trials; |
| TaskQueuePacedSender pacer(time_controller.GetClock(), &packet_router, trials, |
| time_controller.GetTaskQueueFactory(), |
| kFixedCoalescingWindow, kPacketBasedHoldback); |
| |
| // Set rates so one packet adds one ms of buffer level. |
| const DataSize kPacketSize = DataSize::Bytes(kDefaultPacketSize); |
| const TimeDelta kPacketPacingTime = TimeDelta::Millis(1); |
| const DataRate kPacingDataRate = kPacketSize / kPacketPacingTime; |
| const TimeDelta kExpectedHoldbackWindow = |
| kPacketPacingTime * kPacketBasedHoldback; |
| // `kFixedCoalescingWindow` sets the upper bound for the window. |
| ASSERT_GE(kFixedCoalescingWindow, kExpectedHoldbackWindow); |
| |
| pacer.SetPacingRates(kPacingDataRate, DataRate::Zero()); |
| EXPECT_CALL(packet_router, FetchFec).WillRepeatedly([]() { |
| return std::vector<std::unique_ptr<RtpPacketToSend>>(); |
| }); |
| pacer.EnsureStarted(); |
| |
| // Add some packets and wait till all have been sent, so that the pacer |
| // has a valid estimate of packet size. |
| const int kNumWarmupPackets = 40; |
| EXPECT_CALL(packet_router, SendPacket).Times(kNumWarmupPackets); |
| pacer.EnqueuePackets( |
| GeneratePackets(RtpPacketMediaType::kVideo, kNumWarmupPackets)); |
| // Wait until all packes have been sent, with a 2x margin. |
| time_controller.AdvanceTime(kPacketPacingTime * (kNumWarmupPackets * 2)); |
| |
| // Enqueue packets. Expect only the first one to be sent immediately. |
| EXPECT_CALL(packet_router, SendPacket).Times(1); |
| pacer.EnqueuePackets( |
| GeneratePackets(RtpPacketMediaType::kVideo, kPacketBasedHoldback)); |
| time_controller.AdvanceTime(TimeDelta::Zero()); |
| |
| // Advance time to 1ms before the coalescing window ends. |
| EXPECT_CALL(packet_router, SendPacket).Times(0); |
| time_controller.AdvanceTime(kExpectedHoldbackWindow - TimeDelta::Millis(1)); |
| |
| // Advance past where the coalescing window should end. |
| EXPECT_CALL(packet_router, SendPacket).Times(kPacketBasedHoldback - 1); |
| time_controller.AdvanceTime(TimeDelta::Millis(1)); |
| } |
| |
| TEST(TaskQueuePacedSenderTest, FixedHoldBackHasPriorityOverPackets) { |
| const TimeDelta kFixedCoalescingWindow = TimeDelta::Millis(2); |
| const int kPacketBasedHoldback = 5; |
| |
| GlobalSimulatedTimeController time_controller(Timestamp::Millis(1234)); |
| MockPacketRouter packet_router; |
| ScopedKeyValueConfig trials; |
| TaskQueuePacedSender pacer(time_controller.GetClock(), &packet_router, trials, |
| time_controller.GetTaskQueueFactory(), |
| kFixedCoalescingWindow, kPacketBasedHoldback); |
| |
| // Set rates so one packet adds one ms of buffer level. |
| const DataSize kPacketSize = DataSize::Bytes(kDefaultPacketSize); |
| const TimeDelta kPacketPacingTime = TimeDelta::Millis(1); |
| const DataRate kPacingDataRate = kPacketSize / kPacketPacingTime; |
| const TimeDelta kExpectedPacketHoldbackWindow = |
| kPacketPacingTime * kPacketBasedHoldback; |
| // |kFixedCoalescingWindow| sets the upper bound for the window. |
| ASSERT_LT(kFixedCoalescingWindow, kExpectedPacketHoldbackWindow); |
| |
| pacer.SetPacingRates(kPacingDataRate, DataRate::Zero()); |
| EXPECT_CALL(packet_router, FetchFec).WillRepeatedly([]() { |
| return std::vector<std::unique_ptr<RtpPacketToSend>>(); |
| }); |
| pacer.EnsureStarted(); |
| |
| // Add some packets and wait till all have been sent, so that the pacer |
| // has a valid estimate of packet size. |
| const int kNumWarmupPackets = 40; |
| EXPECT_CALL(packet_router, SendPacket).Times(kNumWarmupPackets); |
| pacer.EnqueuePackets( |
| GeneratePackets(RtpPacketMediaType::kVideo, kNumWarmupPackets)); |
| // Wait until all packes have been sent, with a 2x margin. |
| time_controller.AdvanceTime(kPacketPacingTime * (kNumWarmupPackets * 2)); |
| |
| // Enqueue packets. Expect onlt the first one to be sent immediately. |
| EXPECT_CALL(packet_router, SendPacket).Times(1); |
| pacer.EnqueuePackets( |
| GeneratePackets(RtpPacketMediaType::kVideo, kPacketBasedHoldback)); |
| time_controller.AdvanceTime(TimeDelta::Zero()); |
| |
| // Advance time to the fixed coalescing window, that should take presedence so |
| // at least some of the packets should be sent. |
| EXPECT_CALL(packet_router, SendPacket).Times(AtLeast(1)); |
| time_controller.AdvanceTime(kFixedCoalescingWindow); |
| } |
| |
| TEST(TaskQueuePacedSenderTest, ProbingStopDuringSendLoop) { |
| // Set a low `min_probe_delta` to let probing finish during send loop. |
| ScopedKeyValueConfig trials( |
| "WebRTC-Bwe-ProbingBehavior/min_probe_delta:100us/"); |
| |
| GlobalSimulatedTimeController time_controller(Timestamp::Millis(1234)); |
| MockPacketRouter packet_router; |
| TaskQueuePacedSender pacer(time_controller.GetClock(), &packet_router, trials, |
| time_controller.GetTaskQueueFactory(), |
| PacingController::kMinSleepTime, |
| TaskQueuePacedSender::kNoPacketHoldback); |
| |
| // Set rates so 2 packets adds 1ms of buffer level. |
| const DataSize kPacketSize = DataSize::Bytes(kDefaultPacketSize); |
| const TimeDelta kPacketPacingTime = TimeDelta::Millis(1); |
| const DataRate kPacingDataRate = 2 * kPacketSize / kPacketPacingTime; |
| |
| pacer.SetPacingRates(kPacingDataRate, DataRate::Zero()); |
| pacer.EnsureStarted(); |
| |
| EXPECT_CALL(packet_router, FetchFec).WillRepeatedly([]() { |
| return std::vector<std::unique_ptr<RtpPacketToSend>>(); |
| }); |
| EXPECT_CALL(packet_router, GeneratePadding(_)) |
| .WillRepeatedly( |
| [](DataSize target_size) { return GeneratePadding(target_size); }); |
| |
| // Set probe rate. |
| const int kProbeClusterId = 1; |
| const DataRate kProbingRate = kPacingDataRate; |
| |
| pacer.CreateProbeClusters( |
| {{.at_time = time_controller.GetClock()->CurrentTime(), |
| .target_data_rate = kProbingRate, |
| .target_duration = TimeDelta::Millis(15), |
| .target_probe_count = 4, |
| .id = kProbeClusterId}}); |
| |
| const int kPacketsToSend = 100; |
| const TimeDelta kPacketsPacedTime = |
| std::max(kPacketsToSend * kPacketSize / kPacingDataRate, |
| kPacketsToSend * kPacketSize / kProbingRate); |
| |
| // Expect all packets and one padding packet sent. |
| EXPECT_CALL(packet_router, SendPacket).Times(kPacketsToSend + 1); |
| pacer.EnqueuePackets( |
| GeneratePackets(RtpPacketMediaType::kVideo, kPacketsToSend)); |
| time_controller.AdvanceTime(kPacketsPacedTime + TimeDelta::Millis(1)); |
| } |
| |
| TEST(TaskQueuePacedSenderTest, Stats) { |
| static constexpr Timestamp kStartTime = Timestamp::Millis(1234); |
| GlobalSimulatedTimeController time_controller(kStartTime); |
| MockPacketRouter packet_router; |
| ScopedKeyValueConfig trials; |
| TaskQueuePacedSender pacer(time_controller.GetClock(), &packet_router, trials, |
| time_controller.GetTaskQueueFactory(), |
| PacingController::kMinSleepTime, |
| TaskQueuePacedSender::kNoPacketHoldback); |
| |
| // Simulate ~2mbps video stream, covering one second. |
| static constexpr size_t kPacketsToSend = 200; |
| static constexpr DataRate kPacingRate = |
| DataRate::BytesPerSec(kDefaultPacketSize * kPacketsToSend); |
| pacer.SetPacingRates(kPacingRate, DataRate::Zero()); |
| pacer.EnsureStarted(); |
| |
| // Allowed `QueueSizeData` and `ExpectedQueueTime` deviation. |
| static constexpr size_t kAllowedPacketsDeviation = 1; |
| static constexpr DataSize kAllowedQueueSizeDeviation = |
| DataSize::Bytes(kDefaultPacketSize * kAllowedPacketsDeviation); |
| static constexpr TimeDelta kAllowedQueueTimeDeviation = |
| kAllowedQueueSizeDeviation / kPacingRate; |
| |
| DataSize expected_queue_size = DataSize::MinusInfinity(); |
| TimeDelta expected_queue_time = TimeDelta::MinusInfinity(); |
| |
| EXPECT_CALL(packet_router, SendPacket).Times(kPacketsToSend); |
| |
| // Stats before insert any packets. |
| EXPECT_TRUE(pacer.OldestPacketWaitTime().IsZero()); |
| EXPECT_FALSE(pacer.FirstSentPacketTime().has_value()); |
| EXPECT_TRUE(pacer.QueueSizeData().IsZero()); |
| EXPECT_TRUE(pacer.ExpectedQueueTime().IsZero()); |
| |
| pacer.EnqueuePackets( |
| GeneratePackets(RtpPacketMediaType::kVideo, kPacketsToSend)); |
| |
| // Advance to 200ms. |
| time_controller.AdvanceTime(TimeDelta::Millis(200)); |
| EXPECT_EQ(pacer.OldestPacketWaitTime(), TimeDelta::Millis(200)); |
| EXPECT_EQ(pacer.FirstSentPacketTime(), kStartTime); |
| |
| expected_queue_size = kPacingRate * TimeDelta::Millis(800); |
| expected_queue_time = expected_queue_size / kPacingRate; |
| EXPECT_NEAR(pacer.QueueSizeData().bytes(), expected_queue_size.bytes(), |
| kAllowedQueueSizeDeviation.bytes()); |
| EXPECT_NEAR(pacer.ExpectedQueueTime().ms(), expected_queue_time.ms(), |
| kAllowedQueueTimeDeviation.ms()); |
| |
| // Advance to 500ms. |
| time_controller.AdvanceTime(TimeDelta::Millis(300)); |
| EXPECT_EQ(pacer.OldestPacketWaitTime(), TimeDelta::Millis(500)); |
| EXPECT_EQ(pacer.FirstSentPacketTime(), kStartTime); |
| |
| expected_queue_size = kPacingRate * TimeDelta::Millis(500); |
| expected_queue_time = expected_queue_size / kPacingRate; |
| EXPECT_NEAR(pacer.QueueSizeData().bytes(), expected_queue_size.bytes(), |
| kAllowedQueueSizeDeviation.bytes()); |
| EXPECT_NEAR(pacer.ExpectedQueueTime().ms(), expected_queue_time.ms(), |
| kAllowedQueueTimeDeviation.ms()); |
| |
| // Advance to 1000ms+, expect all packets to be sent. |
| time_controller.AdvanceTime(TimeDelta::Millis(500) + |
| kAllowedQueueTimeDeviation); |
| EXPECT_TRUE(pacer.OldestPacketWaitTime().IsZero()); |
| EXPECT_EQ(pacer.FirstSentPacketTime(), kStartTime); |
| EXPECT_TRUE(pacer.QueueSizeData().IsZero()); |
| EXPECT_TRUE(pacer.ExpectedQueueTime().IsZero()); |
| } |
| |
| TEST(TaskQueuePacedSenderTest, HighPrecisionPacingWhenSlackIsDisabled) { |
| test::ScopedKeyValueConfig experiments( |
| "WebRTC-SlackedTaskQueuePacedSender/Disabled/"); |
| |
| GlobalSimulatedTimeController time_controller(Timestamp::Millis(1234)); |
| TaskQueueWithFakePrecisionFactory task_queue_factory( |
| time_controller.GetTaskQueueFactory()); |
| |
| MockPacketRouter packet_router; |
| TaskQueuePacedSender pacer(time_controller.GetClock(), &packet_router, |
| experiments, &task_queue_factory, |
| PacingController::kMinSleepTime, |
| TaskQueuePacedSender::kNoPacketHoldback); |
| |
| // Send enough packets (covering one second) that pacing is triggered, i.e. |
| // delayed tasks being scheduled. |
| static constexpr size_t kPacketsToSend = 42; |
| static constexpr DataRate kPacingRate = |
| DataRate::BitsPerSec(kDefaultPacketSize * 8 * kPacketsToSend); |
| pacer.SetPacingRates(kPacingRate, DataRate::Zero()); |
| pacer.EnsureStarted(); |
| pacer.EnqueuePackets( |
| GeneratePackets(RtpPacketMediaType::kVideo, kPacketsToSend)); |
| // Expect all of them to be sent. |
| size_t packets_sent = 0; |
| EXPECT_CALL(packet_router, SendPacket) |
| .WillRepeatedly( |
| [&](std::unique_ptr<RtpPacketToSend> packet, |
| const PacedPacketInfo& cluster_info) { ++packets_sent; }); |
| time_controller.AdvanceTime(TimeDelta::Seconds(1)); |
| EXPECT_EQ(packets_sent, kPacketsToSend); |
| |
| // Expect pacing to make use of high precision. |
| EXPECT_EQ(task_queue_factory.delayed_low_precision_count(), 0); |
| EXPECT_GT(task_queue_factory.delayed_high_precision_count(), 0); |
| |
| // Create probe cluster which is also high precision. |
| pacer.CreateProbeClusters( |
| {{.at_time = time_controller.GetClock()->CurrentTime(), |
| .target_data_rate = kPacingRate, |
| .target_duration = TimeDelta::Millis(15), |
| .target_probe_count = 4, |
| .id = 123}}); |
| pacer.EnqueuePackets(GeneratePackets(RtpPacketMediaType::kVideo, 1)); |
| time_controller.AdvanceTime(TimeDelta::Seconds(1)); |
| EXPECT_EQ(task_queue_factory.delayed_low_precision_count(), 0); |
| EXPECT_GT(task_queue_factory.delayed_high_precision_count(), 0); |
| } |
| |
| TEST(TaskQueuePacedSenderTest, LowPrecisionPacingWhenSlackIsEnabled) { |
| test::ScopedKeyValueConfig experiments( |
| "WebRTC-SlackedTaskQueuePacedSender/Enabled/"); |
| |
| GlobalSimulatedTimeController time_controller(Timestamp::Millis(1234)); |
| TaskQueueWithFakePrecisionFactory task_queue_factory( |
| time_controller.GetTaskQueueFactory()); |
| |
| MockPacketRouter packet_router; |
| TaskQueuePacedSender pacer(time_controller.GetClock(), &packet_router, |
| experiments, &task_queue_factory, |
| PacingController::kMinSleepTime, |
| TaskQueuePacedSender::kNoPacketHoldback); |
| |
| // Send enough packets (covering one second) that pacing is triggered, i.e. |
| // delayed tasks being scheduled. |
| static constexpr size_t kPacketsToSend = 42; |
| static constexpr DataRate kPacingRate = |
| DataRate::BitsPerSec(kDefaultPacketSize * 8 * kPacketsToSend); |
| pacer.SetPacingRates(kPacingRate, DataRate::Zero()); |
| pacer.EnsureStarted(); |
| pacer.EnqueuePackets( |
| GeneratePackets(RtpPacketMediaType::kVideo, kPacketsToSend)); |
| // Expect all of them to be sent. |
| size_t packets_sent = 0; |
| EXPECT_CALL(packet_router, SendPacket) |
| .WillRepeatedly( |
| [&](std::unique_ptr<RtpPacketToSend> packet, |
| const PacedPacketInfo& cluster_info) { ++packets_sent; }); |
| time_controller.AdvanceTime(TimeDelta::Seconds(1)); |
| EXPECT_EQ(packets_sent, kPacketsToSend); |
| |
| // Expect pacing to make use of low precision. |
| EXPECT_GT(task_queue_factory.delayed_low_precision_count(), 0); |
| EXPECT_EQ(task_queue_factory.delayed_high_precision_count(), 0); |
| |
| // Create probe cluster, which uses high precision despite regular pacing |
| // being low precision. |
| pacer.CreateProbeClusters( |
| {{.at_time = time_controller.GetClock()->CurrentTime(), |
| .target_data_rate = kPacingRate, |
| .target_duration = TimeDelta::Millis(15), |
| .target_probe_count = 4, |
| .id = 123}}); |
| pacer.EnqueuePackets(GeneratePackets(RtpPacketMediaType::kVideo, 1)); |
| time_controller.AdvanceTime(TimeDelta::Seconds(1)); |
| EXPECT_GT(task_queue_factory.delayed_high_precision_count(), 0); |
| } |
| |
| } // namespace test |
| } // namespace webrtc |
