Revert "Pacer: Reduce TQ wake up and improve packet size estimation"
This reverts commit 37195cf2e577cc09ad1362d046b5c8a9b65d4f99. Reason for revert: Breaks downstream tests (more investigations and testing is necessary). Original change's description: > Pacer: Reduce TQ wake up and improve packet size estimation > > The TQ Pacer schedules delayed task according to target time of > PacingController. It drains all valid ProcessPackets() in single loop, > denies retired scheduled tasks, and round up the timeout to 1ms. > > This CL also improves packet size estimation in TQ Pacer by removing > zero initialization, and introduces `include_overhead_` configuration. > > Tests: > 1. webrtc_perf_tests: MaybeProcessPackets() calls > 2075147 -> 2007995 > > 2. module_unittests: MaybeProcessPackets() calls > 203393 -> 183563 > > 3. peerconnection_unittests: MaybeProcessPackets() calls > 66713-> 64333 > > Bug: webrtc:13417, webrtc:13437 > Change-Id: I18eb0a36dbe063c606b1f27014df74a65ebfc486 > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/242962 > Reviewed-by: Erik Språng <sprang@webrtc.org> > Reviewed-by: Henrik Boström <hbos@webrtc.org> > Commit-Queue: Erik Språng <sprang@webrtc.org> > Cr-Commit-Position: refs/heads/main@{#36179} No-Try: True Bug: webrtc:13417, webrtc:13437 Change-Id: I5418d26d3978f21765ef38acfb002398e671e036 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/255301 Reviewed-by: Henrik Boström <hbos@webrtc.org> Owners-Override: Mirko Bonadei <mbonadei@webrtc.org> Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com> Cr-Commit-Position: refs/heads/main@{#36185}
This commit is contained in:
Mirko Bonadei
committed by
WebRTC LUCI CQ
WebRTC LUCI CQ
parent
f2970c8b37
commit
d8543dedf2
@ -79,8 +79,7 @@ RtpTransportControllerSend::PacerSettings::PacerSettings(
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const WebRtcKeyValueConfig* trials)
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: tq_disabled("Disabled"),
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holdback_window("holdback_window", PacingController::kMinSleepTime),
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holdback_packets("holdback_packets",
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TaskQueuePacedSender::kNoPacketHoldback) {
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holdback_packets("holdback_packets", -1) {
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ParseFieldTrial({&tq_disabled, &holdback_window, &holdback_packets},
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trials->Lookup("WebRTC-TaskQueuePacer"));
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}
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@ -38,6 +38,11 @@ constexpr TimeDelta kMaxElapsedTime = TimeDelta::Seconds(2);
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// time. Applies only to periodic mode.
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constexpr TimeDelta kMaxProcessingInterval = TimeDelta::Millis(30);
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// Allow probes to be processed slightly ahead of inteded send time. Currently
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// set to 1ms as this is intended to allow times be rounded down to the nearest
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// millisecond.
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constexpr TimeDelta kMaxEarlyProbeProcessing = TimeDelta::Millis(1);
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constexpr int kFirstPriority = 0;
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bool IsDisabled(const WebRtcKeyValueConfig& field_trials,
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@ -89,8 +94,6 @@ const float PacingController::kDefaultPaceMultiplier = 2.5f;
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const TimeDelta PacingController::kPausedProcessInterval =
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kCongestedPacketInterval;
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const TimeDelta PacingController::kMinSleepTime = TimeDelta::Millis(1);
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const TimeDelta PacingController::kMaxEarlyProbeProcessing =
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TimeDelta::Millis(1);
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PacingController::PacingController(Clock* clock,
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PacketSender* packet_sender,
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@ -130,7 +133,7 @@ PacingController::PacingController(Clock* clock,
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packet_counter_(0),
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congestion_window_size_(DataSize::PlusInfinity()),
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outstanding_data_(DataSize::Zero()),
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queue_time_limit_(kMaxExpectedQueueLength),
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queue_time_limit(kMaxExpectedQueueLength),
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account_for_audio_(false),
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include_overhead_(false) {
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if (!drain_large_queues_) {
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@ -221,7 +224,6 @@ void PacingController::SetPacingRates(DataRate pacing_rate,
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media_rate_ = pacing_rate;
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padding_rate_ = padding_rate;
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pacing_bitrate_ = pacing_rate;
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media_budget_.set_target_rate_kbps(pacing_rate.kbps());
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padding_budget_.set_target_rate_kbps(padding_rate.kbps());
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RTC_LOG(LS_VERBOSE) << "bwe:pacer_updated pacing_kbps="
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@ -300,7 +302,10 @@ void PacingController::EnqueuePacketInternal(
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// Use that as last process time only if it's prior to now.
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target_process_time = std::min(now, next_send_time);
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}
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UpdateBudgetWithElapsedTime(UpdateTimeAndGetElapsed(target_process_time));
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TimeDelta elapsed_time = UpdateTimeAndGetElapsed(target_process_time);
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UpdateBudgetWithElapsedTime(elapsed_time);
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last_process_time_ = target_process_time;
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}
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packet_queue_.Push(priority, now, packet_counter_++, std::move(packet));
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}
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@ -311,6 +316,7 @@ TimeDelta PacingController::UpdateTimeAndGetElapsed(Timestamp now) {
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if (last_process_time_.IsMinusInfinity() || now < last_process_time_) {
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return TimeDelta::Zero();
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}
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RTC_DCHECK_GE(now, last_process_time_);
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TimeDelta elapsed_time = now - last_process_time_;
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last_process_time_ = now;
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if (elapsed_time > kMaxElapsedTime) {
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@ -327,7 +333,8 @@ bool PacingController::ShouldSendKeepalive(Timestamp now) const {
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packet_counter_ == 0) {
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// We send a padding packet every 500 ms to ensure we won't get stuck in
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// congested state due to no feedback being received.
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if (now - last_send_time_ >= kCongestedPacketInterval) {
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TimeDelta elapsed_since_last_send = now - last_send_time_;
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if (elapsed_since_last_send >= kCongestedPacketInterval) {
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return true;
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}
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}
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@ -336,17 +343,17 @@ bool PacingController::ShouldSendKeepalive(Timestamp now) const {
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Timestamp PacingController::NextSendTime() const {
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const Timestamp now = CurrentTime();
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Timestamp next_send_time = Timestamp::PlusInfinity();
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if (paused_) {
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return last_send_time_ + kPausedProcessInterval;
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}
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// If probing is active, that always takes priority.
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if (prober_.is_probing() && !probing_send_failure_) {
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if (prober_.is_probing()) {
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Timestamp probe_time = prober_.NextProbeTime(now);
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if (!probe_time.IsPlusInfinity()) {
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return probe_time.IsMinusInfinity() ? now : probe_time;
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// `probe_time` == PlusInfinity indicates no probe scheduled.
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if (probe_time != Timestamp::PlusInfinity() && !probing_send_failure_) {
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return probe_time;
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}
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}
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@ -358,53 +365,86 @@ Timestamp PacingController::NextSendTime() const {
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// In dynamic mode, figure out when the next packet should be sent,
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// given the current conditions.
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// Not pacing audio, if leading packet is audio its target send
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// time is the time at which it was enqueued.
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absl::optional<Timestamp> unpaced_audio_time =
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pace_audio_ ? absl::nullopt
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: packet_queue_.LeadingAudioPacketEnqueueTime();
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if (unpaced_audio_time) {
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return *unpaced_audio_time;
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if (!pace_audio_) {
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// Not pacing audio, if leading packet is audio its target send
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// time is the time at which it was enqueued.
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absl::optional<Timestamp> audio_enqueue_time =
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packet_queue_.LeadingAudioPacketEnqueueTime();
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if (audio_enqueue_time.has_value()) {
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return *audio_enqueue_time;
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}
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}
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// We need to at least send keep-alive packets with some interval.
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if (Congested() || packet_counter_ == 0) {
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// We need to at least send keep-alive packets with some interval.
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return last_send_time_ + kCongestedPacketInterval;
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}
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// Check how long until we can send the next media packet.
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if (media_rate_ > DataRate::Zero() && !packet_queue_.Empty()) {
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// Check how long until we can send the next media packet.
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next_send_time = last_process_time_ + media_debt_ / media_rate_;
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} else if (padding_rate_ > DataRate::Zero() && packet_queue_.Empty()) {
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// If we _don't_ have pending packets, check how long until we have
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// bandwidth for padding packets. Both media and padding debts must
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// have been drained to do this.
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RTC_DCHECK_GT(media_rate_, DataRate::Zero());
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return std::min(last_send_time_ + kPausedProcessInterval,
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last_process_time_ + media_debt_ / media_rate_);
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}
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// If we _don't_ have pending packets, check how long until we have
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// bandwidth for padding packets. Both media and padding debts must
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// have been drained to do this.
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if (padding_rate_ > DataRate::Zero() && packet_queue_.Empty()) {
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TimeDelta drain_time =
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std::max(media_debt_ / media_rate_, padding_debt_ / padding_rate_);
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next_send_time = last_process_time_ + drain_time;
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} else {
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// Nothing to do.
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next_send_time = last_process_time_ + kPausedProcessInterval;
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return std::min(last_send_time_ + kPausedProcessInterval,
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last_process_time_ + drain_time);
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}
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if (send_padding_if_silent_) {
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next_send_time =
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std::min(next_send_time, last_send_time_ + kPausedProcessInterval);
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return last_send_time_ + kPausedProcessInterval;
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}
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return next_send_time;
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return last_process_time_ + kPausedProcessInterval;
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}
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void PacingController::ProcessPackets() {
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Timestamp now = CurrentTime();
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Timestamp target_send_time = now;
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if (mode_ == ProcessMode::kDynamic) {
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target_send_time = NextSendTime();
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TimeDelta early_execute_margin =
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prober_.is_probing() ? kMaxEarlyProbeProcessing : TimeDelta::Zero();
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if (target_send_time.IsMinusInfinity()) {
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target_send_time = now;
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} else if (now < target_send_time - early_execute_margin) {
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// We are too early, but if queue is empty still allow draining some debt.
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// Probing is allowed to be sent up to kMinSleepTime early.
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TimeDelta elapsed_time = UpdateTimeAndGetElapsed(now);
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UpdateBudgetWithElapsedTime(elapsed_time);
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return;
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}
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if (target_send_time < last_process_time_) {
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// After the last process call, at time X, the target send time
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// shifted to be earlier than X. This should normally not happen
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// but we want to make sure rounding errors or erratic behavior
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// of NextSendTime() does not cause issue. In particular, if the
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// buffer reduction of
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// rate * (target_send_time - previous_process_time)
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// in the main loop doesn't clean up the existing debt we may not
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// be able to send again. We don't want to check this reordering
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// there as it is the normal exit condtion when the buffer is
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// exhausted and there are packets in the queue.
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UpdateBudgetWithElapsedTime(last_process_time_ - target_send_time);
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target_send_time = last_process_time_;
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}
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}
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Timestamp previous_process_time = last_process_time_;
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TimeDelta elapsed_time = UpdateTimeAndGetElapsed(now);
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if (ShouldSendKeepalive(now)) {
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DataSize keepalive_data_sent = DataSize::Zero();
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// We can not send padding unless a normal packet has first been sent. If
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// we do, timestamps get messed up.
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if (packet_counter_ > 0) {
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if (packet_counter_ == 0) {
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last_send_time_ = now;
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} else {
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DataSize keepalive_data_sent = DataSize::Zero();
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std::vector<std::unique_ptr<RtpPacketToSend>> keepalive_packets =
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packet_sender_->GeneratePadding(DataSize::Bytes(1));
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for (auto& packet : keepalive_packets) {
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@ -415,29 +455,14 @@ void PacingController::ProcessPackets() {
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EnqueuePacket(std::move(packet));
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}
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}
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OnPaddingSent(keepalive_data_sent);
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}
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OnPacketSent(RtpPacketMediaType::kPadding, keepalive_data_sent, now);
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}
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if (paused_) {
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return;
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}
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if (mode_ == ProcessMode::kDynamic) {
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TimeDelta early_execute_margin =
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prober_.is_probing() ? kMaxEarlyProbeProcessing : TimeDelta::Zero();
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target_send_time = NextSendTime();
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if (now + early_execute_margin < target_send_time) {
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// We are too early, but if queue is empty still allow draining some debt.
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// Probing is allowed to be sent up to kMinSleepTime early.
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UpdateBudgetWithElapsedTime(UpdateTimeAndGetElapsed(now));
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return;
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}
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}
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TimeDelta elapsed_time = UpdateTimeAndGetElapsed(target_send_time);
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if (elapsed_time > TimeDelta::Zero()) {
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DataRate target_rate = pacing_bitrate_;
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DataSize queue_size_data = packet_queue_.Size();
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@ -449,7 +474,7 @@ void PacingController::ProcessPackets() {
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if (drain_large_queues_) {
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TimeDelta avg_time_left =
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std::max(TimeDelta::Millis(1),
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queue_time_limit_ - packet_queue_.AverageQueueTime());
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queue_time_limit - packet_queue_.AverageQueueTime());
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DataRate min_rate_needed = queue_size_data / avg_time_left;
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if (min_rate_needed > target_rate) {
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target_rate = min_rate_needed;
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@ -464,12 +489,13 @@ void PacingController::ProcessPackets() {
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// up to (process interval duration) * (target rate), so we only need to
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// update it once before the packet sending loop.
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media_budget_.set_target_rate_kbps(target_rate.kbps());
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UpdateBudgetWithElapsedTime(elapsed_time);
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} else {
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media_rate_ = target_rate;
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}
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UpdateBudgetWithElapsedTime(elapsed_time);
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}
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bool first_packet_in_probe = false;
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PacedPacketInfo pacing_info;
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DataSize recommended_probe_size = DataSize::Zero();
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bool is_probing = prober_.is_probing();
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@ -478,23 +504,9 @@ void PacingController::ProcessPackets() {
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// use actual send time rather than target.
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pacing_info = prober_.CurrentCluster(now).value_or(PacedPacketInfo());
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if (pacing_info.probe_cluster_id != PacedPacketInfo::kNotAProbe) {
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first_packet_in_probe = pacing_info.probe_cluster_bytes_sent == 0;
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recommended_probe_size = prober_.RecommendedMinProbeSize();
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RTC_DCHECK_GT(recommended_probe_size, DataSize::Zero());
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// If first packet in probe, insert a small padding packet so we have a
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// more reliable start window for the rate estimation.
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if (pacing_info.probe_cluster_bytes_sent == 0) {
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auto padding = packet_sender_->GeneratePadding(DataSize::Bytes(1));
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// If no RTP modules sending media are registered, we may not get a
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// padding packet back.
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if (!padding.empty()) {
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// Insert with high priority so larger media packets don't preempt it.
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EnqueuePacketInternal(std::move(padding[0]), kFirstPriority);
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// We should never get more than one padding packets with a requested
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// size of 1 byte.
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RTC_DCHECK_EQ(padding.size(), 1u);
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}
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}
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} else {
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// No valid probe cluster returned, probe might have timed out.
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is_probing = false;
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@ -502,74 +514,102 @@ void PacingController::ProcessPackets() {
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}
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DataSize data_sent = DataSize::Zero();
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while (true) {
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// Fetch packet, so long as queue is not empty or budget is not
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// The paused state is checked in the loop since it leaves the critical
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// section allowing the paused state to be changed from other code.
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while (!paused_) {
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if (first_packet_in_probe) {
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// If first packet in probe, insert a small padding packet so we have a
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// more reliable start window for the rate estimation.
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auto padding = packet_sender_->GeneratePadding(DataSize::Bytes(1));
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// If no RTP modules sending media are registered, we may not get a
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// padding packet back.
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if (!padding.empty()) {
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// Insert with high priority so larger media packets don't preempt it.
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EnqueuePacketInternal(std::move(padding[0]), kFirstPriority);
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// We should never get more than one padding packets with a requested
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// size of 1 byte.
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RTC_DCHECK_EQ(padding.size(), 1u);
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}
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first_packet_in_probe = false;
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}
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if (mode_ == ProcessMode::kDynamic &&
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previous_process_time < target_send_time) {
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// Reduce buffer levels with amount corresponding to time between last
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// process and target send time for the next packet.
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// If the process call is late, that may be the time between the optimal
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// send times for two packets we should already have sent.
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UpdateBudgetWithElapsedTime(target_send_time - previous_process_time);
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previous_process_time = target_send_time;
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}
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// Fetch the next packet, so long as queue is not empty or budget is not
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// exhausted.
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std::unique_ptr<RtpPacketToSend> rtp_packet =
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GetPendingPacket(pacing_info, target_send_time, now);
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if (rtp_packet == nullptr) {
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// No packet available to send, check if we should send padding.
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DataSize padding_to_add = PaddingToAdd(recommended_probe_size, data_sent);
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if (padding_to_add > DataSize::Zero()) {
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std::vector<std::unique_ptr<RtpPacketToSend>> padding_packets =
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packet_sender_->GeneratePadding(padding_to_add);
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if (!padding_packets.empty()) {
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for (auto& packet : padding_packets) {
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EnqueuePacket(std::move(packet));
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}
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// Continue loop to send the padding that was just added.
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continue;
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} else {
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// Can't generate padding, still update padding budget for next send
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// time.
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UpdatePaddingBudgetWithSentData(padding_to_add);
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if (padding_packets.empty()) {
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// No padding packets were generated, quite send loop.
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break;
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}
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for (auto& packet : padding_packets) {
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EnqueuePacket(std::move(packet));
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}
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// Continue loop to send the padding that was just added.
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continue;
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}
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// Can't fetch new packet and no padding to send, exit send loop.
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break;
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} else {
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RTC_DCHECK(rtp_packet);
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RTC_DCHECK(rtp_packet->packet_type().has_value());
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const RtpPacketMediaType packet_type = *rtp_packet->packet_type();
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DataSize packet_size = DataSize::Bytes(rtp_packet->payload_size() +
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rtp_packet->padding_size());
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}
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if (include_overhead_) {
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packet_size += DataSize::Bytes(rtp_packet->headers_size()) +
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transport_overhead_per_packet_;
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}
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RTC_DCHECK(rtp_packet);
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RTC_DCHECK(rtp_packet->packet_type().has_value());
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const RtpPacketMediaType packet_type = *rtp_packet->packet_type();
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DataSize packet_size = DataSize::Bytes(rtp_packet->payload_size() +
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rtp_packet->padding_size());
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packet_sender_->SendPacket(std::move(rtp_packet), pacing_info);
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for (auto& packet : packet_sender_->FetchFec()) {
|
||||
EnqueuePacket(std::move(packet));
|
||||
}
|
||||
data_sent += packet_size;
|
||||
if (include_overhead_) {
|
||||
packet_size += DataSize::Bytes(rtp_packet->headers_size()) +
|
||||
transport_overhead_per_packet_;
|
||||
}
|
||||
|
||||
// Send done, update send time.
|
||||
OnPacketSent(packet_type, packet_size, now);
|
||||
packet_sender_->SendPacket(std::move(rtp_packet), pacing_info);
|
||||
for (auto& packet : packet_sender_->FetchFec()) {
|
||||
EnqueuePacket(std::move(packet));
|
||||
}
|
||||
data_sent += packet_size;
|
||||
|
||||
// If we are currently probing, we need to stop the send loop when we
|
||||
// have reached the send target.
|
||||
if (is_probing && data_sent >= recommended_probe_size) {
|
||||
break;
|
||||
}
|
||||
// Send done, update send/process time to the target send time.
|
||||
OnPacketSent(packet_type, packet_size, target_send_time);
|
||||
|
||||
// If we are currently probing, we need to stop the send loop when we have
|
||||
// reached the send target.
|
||||
if (is_probing && data_sent >= recommended_probe_size) {
|
||||
break;
|
||||
}
|
||||
|
||||
if (mode_ == ProcessMode::kDynamic) {
|
||||
// Update target send time in case that are more packets that we are late
|
||||
// in processing.
|
||||
if (mode_ == ProcessMode::kDynamic) {
|
||||
target_send_time = NextSendTime();
|
||||
if (target_send_time > now) {
|
||||
// Exit loop if not probing.
|
||||
if (!is_probing) {
|
||||
break;
|
||||
}
|
||||
target_send_time = now;
|
||||
}
|
||||
UpdateBudgetWithElapsedTime(UpdateTimeAndGetElapsed(target_send_time));
|
||||
Timestamp next_send_time = NextSendTime();
|
||||
if (next_send_time.IsMinusInfinity()) {
|
||||
target_send_time = now;
|
||||
} else {
|
||||
target_send_time = std::min(now, next_send_time);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
last_process_time_ = std::max(last_process_time_, previous_process_time);
|
||||
|
||||
if (is_probing) {
|
||||
probing_send_failure_ = data_sent == DataSize::Zero();
|
||||
if (!probing_send_failure_) {
|
||||
@ -591,8 +631,8 @@ DataSize PacingController::PaddingToAdd(DataSize recommended_probe_size,
|
||||
}
|
||||
|
||||
if (packet_counter_ == 0) {
|
||||
// We can not send padding unless a normal packet has first been sent. If
|
||||
// we do, timestamps get messed up.
|
||||
// We can not send padding unless a normal packet has first been sent. If we
|
||||
// do, timestamps get messed up.
|
||||
return DataSize::Zero();
|
||||
}
|
||||
|
||||
@ -657,16 +697,25 @@ std::unique_ptr<RtpPacketToSend> PacingController::GetPendingPacket(
|
||||
void PacingController::OnPacketSent(RtpPacketMediaType packet_type,
|
||||
DataSize packet_size,
|
||||
Timestamp send_time) {
|
||||
if (!first_sent_packet_time_ && packet_type != RtpPacketMediaType::kPadding) {
|
||||
if (!first_sent_packet_time_) {
|
||||
first_sent_packet_time_ = send_time;
|
||||
}
|
||||
|
||||
bool audio_packet = packet_type == RtpPacketMediaType::kAudio;
|
||||
if ((!audio_packet || account_for_audio_) && packet_size > DataSize::Zero()) {
|
||||
if (!audio_packet || account_for_audio_) {
|
||||
// Update media bytes sent.
|
||||
UpdateBudgetWithSentData(packet_size);
|
||||
}
|
||||
|
||||
last_send_time_ = send_time;
|
||||
last_process_time_ = send_time;
|
||||
}
|
||||
|
||||
void PacingController::OnPaddingSent(DataSize data_sent) {
|
||||
if (data_sent > DataSize::Zero()) {
|
||||
UpdateBudgetWithSentData(data_sent);
|
||||
}
|
||||
Timestamp now = CurrentTime();
|
||||
last_send_time_ = now;
|
||||
last_process_time_ = now;
|
||||
}
|
||||
|
||||
void PacingController::UpdateBudgetWithElapsedTime(TimeDelta delta) {
|
||||
@ -684,24 +733,17 @@ void PacingController::UpdateBudgetWithSentData(DataSize size) {
|
||||
outstanding_data_ += size;
|
||||
if (mode_ == ProcessMode::kPeriodic) {
|
||||
media_budget_.UseBudget(size.bytes());
|
||||
padding_budget_.UseBudget(size.bytes());
|
||||
} else {
|
||||
media_debt_ += size;
|
||||
media_debt_ = std::min(media_debt_, media_rate_ * kMaxDebtInTime);
|
||||
}
|
||||
UpdatePaddingBudgetWithSentData(size);
|
||||
}
|
||||
|
||||
void PacingController::UpdatePaddingBudgetWithSentData(DataSize size) {
|
||||
if (mode_ == ProcessMode::kPeriodic) {
|
||||
padding_budget_.UseBudget(size.bytes());
|
||||
} else {
|
||||
padding_debt_ += size;
|
||||
padding_debt_ = std::min(padding_debt_, padding_rate_ * kMaxDebtInTime);
|
||||
}
|
||||
}
|
||||
|
||||
void PacingController::SetQueueTimeLimit(TimeDelta limit) {
|
||||
queue_time_limit_ = limit;
|
||||
queue_time_limit = limit;
|
||||
}
|
||||
|
||||
} // namespace webrtc
|
||||
|
||||
@ -79,11 +79,6 @@ class PacingController {
|
||||
|
||||
static const TimeDelta kMinSleepTime;
|
||||
|
||||
// Allow probes to be processed slightly ahead of inteded send time. Currently
|
||||
// set to 1ms as this is intended to allow times be rounded down to the
|
||||
// nearest millisecond.
|
||||
static const TimeDelta kMaxEarlyProbeProcessing;
|
||||
|
||||
PacingController(Clock* clock,
|
||||
PacketSender* packet_sender,
|
||||
RtcEventLog* event_log,
|
||||
@ -163,7 +158,6 @@ class PacingController {
|
||||
// Updates the number of bytes that can be sent for the next time interval.
|
||||
void UpdateBudgetWithElapsedTime(TimeDelta delta);
|
||||
void UpdateBudgetWithSentData(DataSize size);
|
||||
void UpdatePaddingBudgetWithSentData(DataSize size);
|
||||
|
||||
DataSize PaddingToAdd(DataSize recommended_probe_size,
|
||||
DataSize data_sent) const;
|
||||
@ -175,6 +169,7 @@ class PacingController {
|
||||
void OnPacketSent(RtpPacketMediaType packet_type,
|
||||
DataSize packet_size,
|
||||
Timestamp send_time);
|
||||
void OnPaddingSent(DataSize padding_sent);
|
||||
|
||||
Timestamp CurrentTime() const;
|
||||
|
||||
@ -201,9 +196,9 @@ class PacingController {
|
||||
mutable Timestamp last_timestamp_;
|
||||
bool paused_;
|
||||
|
||||
// In periodic mode, `media_budget_` and `padding_budget_` will be used to
|
||||
// In dynamic mode, `media_budget_` and `padding_budget_` will be used to
|
||||
// track when packets can be sent.
|
||||
// In dynamic mode, `media_debt_` and `padding_debt_` will be used together
|
||||
// In periodic mode, `media_debt_` and `padding_debt_` will be used together
|
||||
// with the target rates.
|
||||
|
||||
// This is the media budget, keeping track of how many bits of media
|
||||
@ -234,7 +229,7 @@ class PacingController {
|
||||
DataSize congestion_window_size_;
|
||||
DataSize outstanding_data_;
|
||||
|
||||
TimeDelta queue_time_limit_;
|
||||
TimeDelta queue_time_limit;
|
||||
bool account_for_audio_;
|
||||
bool include_overhead_;
|
||||
};
|
||||
|
||||
@ -12,14 +12,15 @@
|
||||
|
||||
#include <algorithm>
|
||||
#include <utility>
|
||||
|
||||
#include "absl/memory/memory.h"
|
||||
#include "rtc_base/checks.h"
|
||||
#include "rtc_base/event.h"
|
||||
#include "rtc_base/logging.h"
|
||||
#include "rtc_base/task_utils/to_queued_task.h"
|
||||
#include "rtc_base/trace_event.h"
|
||||
|
||||
namespace webrtc {
|
||||
|
||||
const int TaskQueuePacedSender::kNoPacketHoldback = -1;
|
||||
|
||||
TaskQueuePacedSender::TaskQueuePacedSender(
|
||||
Clock* clock,
|
||||
PacingController::PacketSender* packet_sender,
|
||||
@ -40,11 +41,10 @@ TaskQueuePacedSender::TaskQueuePacedSender(
|
||||
is_started_(false),
|
||||
is_shutdown_(false),
|
||||
packet_size_(/*alpha=*/0.95),
|
||||
include_overhead_(false),
|
||||
task_queue_(task_queue_factory->CreateTaskQueue(
|
||||
"TaskQueuePacedSender",
|
||||
TaskQueueFactory::Priority::NORMAL)) {
|
||||
RTC_DCHECK_GE(max_hold_back_window_, PacingController::kMinSleepTime);
|
||||
packet_size_.Apply(1, 0);
|
||||
}
|
||||
|
||||
TaskQueuePacedSender::~TaskQueuePacedSender() {
|
||||
@ -140,11 +140,7 @@ void TaskQueuePacedSender::EnqueuePackets(
|
||||
task_queue_.PostTask([this, packets_ = std::move(packets)]() mutable {
|
||||
RTC_DCHECK_RUN_ON(&task_queue_);
|
||||
for (auto& packet : packets_) {
|
||||
size_t packet_size = packet->payload_size() + packet->padding_size();
|
||||
if (include_overhead_) {
|
||||
packet_size += packet->headers_size();
|
||||
}
|
||||
packet_size_.Apply(1, packet_size);
|
||||
packet_size_.Apply(1, packet->size());
|
||||
RTC_DCHECK_GE(packet->capture_time(), Timestamp::Zero());
|
||||
pacing_controller_.EnqueuePacket(std::move(packet));
|
||||
}
|
||||
@ -163,7 +159,6 @@ void TaskQueuePacedSender::SetAccountForAudioPackets(bool account_for_audio) {
|
||||
void TaskQueuePacedSender::SetIncludeOverhead() {
|
||||
task_queue_.PostTask([this]() {
|
||||
RTC_DCHECK_RUN_ON(&task_queue_);
|
||||
include_overhead_ = true;
|
||||
pacing_controller_.SetIncludeOverhead();
|
||||
MaybeProcessPackets(Timestamp::MinusInfinity());
|
||||
});
|
||||
@ -199,16 +194,13 @@ absl::optional<Timestamp> TaskQueuePacedSender::FirstSentPacketTime() const {
|
||||
|
||||
TimeDelta TaskQueuePacedSender::OldestPacketWaitTime() const {
|
||||
Timestamp oldest_packet = GetStats().oldest_packet_enqueue_time;
|
||||
if (oldest_packet.IsInfinite()) {
|
||||
if (oldest_packet.IsInfinite())
|
||||
return TimeDelta::Zero();
|
||||
}
|
||||
|
||||
// (webrtc:9716): The clock is not always monotonic.
|
||||
Timestamp current = clock_->CurrentTime();
|
||||
if (current < oldest_packet) {
|
||||
if (current < oldest_packet)
|
||||
return TimeDelta::Zero();
|
||||
}
|
||||
|
||||
return current - oldest_packet;
|
||||
}
|
||||
|
||||
@ -221,70 +213,70 @@ void TaskQueuePacedSender::MaybeProcessPackets(
|
||||
Timestamp scheduled_process_time) {
|
||||
RTC_DCHECK_RUN_ON(&task_queue_);
|
||||
|
||||
#if RTC_TRACE_EVENTS_ENABLED
|
||||
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("webrtc"),
|
||||
"TaskQueuePacedSender::MaybeProcessPackets");
|
||||
#endif
|
||||
|
||||
if (is_shutdown_ || !is_started_) {
|
||||
return;
|
||||
}
|
||||
|
||||
Timestamp next_send_time = pacing_controller_.NextSendTime();
|
||||
RTC_DCHECK(next_send_time.IsFinite());
|
||||
// Normally, run ProcessPackets() only if this is the scheduled task.
|
||||
// If it is not but it is already time to process and there either is
|
||||
// no scheduled task or the schedule has shifted forward in time, run
|
||||
// anyway and clear any schedule.
|
||||
Timestamp next_process_time = pacing_controller_.NextSendTime();
|
||||
const Timestamp now = clock_->CurrentTime();
|
||||
|
||||
TimeDelta early_execute_margin =
|
||||
pacing_controller_.IsProbing()
|
||||
? PacingController::kMaxEarlyProbeProcessing
|
||||
: TimeDelta::Zero();
|
||||
|
||||
// Process packets and update stats.
|
||||
while (next_send_time <= now + early_execute_margin) {
|
||||
pacing_controller_.ProcessPackets();
|
||||
next_send_time = pacing_controller_.NextSendTime();
|
||||
RTC_DCHECK(next_send_time.IsFinite());
|
||||
}
|
||||
UpdateStats();
|
||||
|
||||
// Ignore retired scheduled task, otherwise reset `next_process_time_`.
|
||||
if (scheduled_process_time.IsFinite()) {
|
||||
if (scheduled_process_time != next_process_time_) {
|
||||
return;
|
||||
}
|
||||
const bool is_scheduled_call = next_process_time_ == scheduled_process_time;
|
||||
if (is_scheduled_call) {
|
||||
// Indicate no pending scheduled call.
|
||||
next_process_time_ = Timestamp::MinusInfinity();
|
||||
}
|
||||
if (is_scheduled_call ||
|
||||
(now >= next_process_time && (next_process_time_.IsInfinite() ||
|
||||
next_process_time < next_process_time_))) {
|
||||
pacing_controller_.ProcessPackets();
|
||||
next_process_time = pacing_controller_.NextSendTime();
|
||||
}
|
||||
|
||||
// Do not hold back in probing.
|
||||
TimeDelta hold_back_window = TimeDelta::Zero();
|
||||
if (!pacing_controller_.IsProbing()) {
|
||||
hold_back_window = max_hold_back_window_;
|
||||
DataRate pacing_rate = pacing_controller_.pacing_rate();
|
||||
if (max_hold_back_window_in_packets_ != kNoPacketHoldback &&
|
||||
!pacing_rate.IsZero() &&
|
||||
packet_size_.filtered() != rtc::ExpFilter::kValueUndefined) {
|
||||
TimeDelta avg_packet_send_time =
|
||||
DataSize::Bytes(packet_size_.filtered()) / pacing_rate;
|
||||
hold_back_window =
|
||||
std::min(hold_back_window,
|
||||
avg_packet_send_time * max_hold_back_window_in_packets_);
|
||||
TimeDelta hold_back_window = max_hold_back_window_;
|
||||
DataRate pacing_rate = pacing_controller_.pacing_rate();
|
||||
DataSize avg_packet_size = DataSize::Bytes(packet_size_.filtered());
|
||||
if (max_hold_back_window_in_packets_ > 0 && !pacing_rate.IsZero() &&
|
||||
!avg_packet_size.IsZero()) {
|
||||
TimeDelta avg_packet_send_time = avg_packet_size / pacing_rate;
|
||||
hold_back_window =
|
||||
std::min(hold_back_window,
|
||||
avg_packet_send_time * max_hold_back_window_in_packets_);
|
||||
}
|
||||
|
||||
absl::optional<TimeDelta> time_to_next_process;
|
||||
if (pacing_controller_.IsProbing() &&
|
||||
next_process_time != next_process_time_) {
|
||||
// If we're probing and there isn't already a wakeup scheduled for the next
|
||||
// process time, always post a task and just round sleep time down to
|
||||
// nearest millisecond.
|
||||
if (next_process_time.IsMinusInfinity()) {
|
||||
time_to_next_process = TimeDelta::Zero();
|
||||
} else {
|
||||
time_to_next_process =
|
||||
std::max(TimeDelta::Zero(),
|
||||
(next_process_time - now).RoundDownTo(TimeDelta::Millis(1)));
|
||||
}
|
||||
} else if (next_process_time_.IsMinusInfinity() ||
|
||||
next_process_time <= next_process_time_ - hold_back_window) {
|
||||
// Schedule a new task since there is none currently scheduled
|
||||
// (`next_process_time_` is infinite), or the new process time is at least
|
||||
// one holdback window earlier than whatever is currently scheduled.
|
||||
time_to_next_process = std::max(next_process_time - now, hold_back_window);
|
||||
}
|
||||
|
||||
// Calculate next process time.
|
||||
TimeDelta time_to_next_process =
|
||||
std::max(hold_back_window, next_send_time - now - early_execute_margin);
|
||||
next_send_time = now + time_to_next_process;
|
||||
if (time_to_next_process) {
|
||||
// Set a new scheduled process time and post a delayed task.
|
||||
next_process_time_ = next_process_time;
|
||||
|
||||
// If no in flight task or in flight task is later than `next_send_time`,
|
||||
// schedule a new one. Previous in flight task will be retired.
|
||||
if (next_process_time_.IsMinusInfinity() ||
|
||||
next_process_time_ > next_send_time) {
|
||||
task_queue_.PostDelayedHighPrecisionTask(
|
||||
[this, next_send_time]() { MaybeProcessPackets(next_send_time); },
|
||||
time_to_next_process.RoundUpTo(TimeDelta::Millis(1)).ms<uint32_t>());
|
||||
next_process_time_ = next_send_time;
|
||||
[this, next_process_time]() { MaybeProcessPackets(next_process_time); },
|
||||
time_to_next_process->ms<uint32_t>());
|
||||
}
|
||||
|
||||
UpdateStats();
|
||||
}
|
||||
|
||||
void TaskQueuePacedSender::UpdateStats() {
|
||||
|
||||
@ -14,7 +14,9 @@
|
||||
#include <stddef.h>
|
||||
#include <stdint.h>
|
||||
|
||||
#include <functional>
|
||||
#include <memory>
|
||||
#include <queue>
|
||||
#include <vector>
|
||||
|
||||
#include "absl/types/optional.h"
|
||||
@ -27,6 +29,7 @@
|
||||
#include "modules/pacing/rtp_packet_pacer.h"
|
||||
#include "modules/rtp_rtcp/source/rtp_packet_to_send.h"
|
||||
#include "rtc_base/numerics/exp_filter.h"
|
||||
#include "rtc_base/synchronization/mutex.h"
|
||||
#include "rtc_base/task_queue.h"
|
||||
#include "rtc_base/thread_annotations.h"
|
||||
|
||||
@ -36,8 +39,6 @@ class RtcEventLog;
|
||||
|
||||
class TaskQueuePacedSender : public RtpPacketPacer, public RtpPacketSender {
|
||||
public:
|
||||
static const int kNoPacketHoldback;
|
||||
|
||||
// The `hold_back_window` parameter sets a lower bound on time to sleep if
|
||||
// there is currently a pacer queue and packets can't immediately be
|
||||
// processed. Increasing this reduces thread wakeups at the expense of higher
|
||||
@ -50,7 +51,7 @@ class TaskQueuePacedSender : public RtpPacketPacer, public RtpPacketSender {
|
||||
const WebRtcKeyValueConfig* field_trials,
|
||||
TaskQueueFactory* task_queue_factory,
|
||||
TimeDelta max_hold_back_window = PacingController::kMinSleepTime,
|
||||
int max_hold_back_window_in_packets = kNoPacketHoldback);
|
||||
int max_hold_back_window_in_packets = -1);
|
||||
|
||||
~TaskQueuePacedSender() override;
|
||||
|
||||
@ -155,7 +156,6 @@ class TaskQueuePacedSender : public RtpPacketPacer, public RtpPacketSender {
|
||||
|
||||
// Filtered size of enqueued packets, in bytes.
|
||||
rtc::ExpFilter packet_size_ RTC_GUARDED_BY(task_queue_);
|
||||
bool include_overhead_ RTC_GUARDED_BY(task_queue_);
|
||||
|
||||
mutable Mutex stats_mutex_;
|
||||
Stats current_stats_ RTC_GUARDED_BY(stats_mutex_);
|
||||
|
||||
@ -37,6 +37,7 @@ constexpr uint32_t kVideoSsrc = 234565;
|
||||
constexpr uint32_t kVideoRtxSsrc = 34567;
|
||||
constexpr uint32_t kFlexFecSsrc = 45678;
|
||||
constexpr size_t kDefaultPacketSize = 1234;
|
||||
constexpr int kNoPacketHoldback = -1;
|
||||
|
||||
class MockPacketRouter : public PacketRouter {
|
||||
public:
|
||||
@ -119,7 +120,7 @@ TEST(TaskQueuePacedSenderTest, PacesPackets) {
|
||||
time_controller.GetClock(), &packet_router,
|
||||
/*event_log=*/nullptr,
|
||||
/*field_trials=*/nullptr, time_controller.GetTaskQueueFactory(),
|
||||
PacingController::kMinSleepTime, TaskQueuePacedSender::kNoPacketHoldback);
|
||||
PacingController::kMinSleepTime, kNoPacketHoldback);
|
||||
|
||||
// Insert a number of packets, covering one second.
|
||||
static constexpr size_t kPacketsToSend = 42;
|
||||
@ -159,7 +160,7 @@ TEST(TaskQueuePacedSenderTest, ReschedulesProcessOnRateChange) {
|
||||
time_controller.GetClock(), &packet_router,
|
||||
/*event_log=*/nullptr,
|
||||
/*field_trials=*/nullptr, time_controller.GetTaskQueueFactory(),
|
||||
PacingController::kMinSleepTime, TaskQueuePacedSender::kNoPacketHoldback);
|
||||
PacingController::kMinSleepTime, kNoPacketHoldback);
|
||||
|
||||
// Insert a number of packets to be sent 200ms apart.
|
||||
const size_t kPacketsPerSecond = 5;
|
||||
@ -211,7 +212,7 @@ TEST(TaskQueuePacedSenderTest, SendsAudioImmediately) {
|
||||
time_controller.GetClock(), &packet_router,
|
||||
/*event_log=*/nullptr,
|
||||
/*field_trials=*/nullptr, time_controller.GetTaskQueueFactory(),
|
||||
PacingController::kMinSleepTime, TaskQueuePacedSender::kNoPacketHoldback);
|
||||
PacingController::kMinSleepTime, kNoPacketHoldback);
|
||||
|
||||
const DataRate kPacingDataRate = DataRate::KilobitsPerSec(125);
|
||||
const DataSize kPacketSize = DataSize::Bytes(kDefaultPacketSize);
|
||||
@ -240,11 +241,11 @@ TEST(TaskQueuePacedSenderTest, SleepsDuringCoalscingWindow) {
|
||||
const TimeDelta kCoalescingWindow = TimeDelta::Millis(5);
|
||||
GlobalSimulatedTimeController time_controller(Timestamp::Millis(1234));
|
||||
MockPacketRouter packet_router;
|
||||
TaskQueuePacedSender pacer(
|
||||
time_controller.GetClock(), &packet_router,
|
||||
/*event_log=*/nullptr,
|
||||
/*field_trials=*/nullptr, time_controller.GetTaskQueueFactory(),
|
||||
kCoalescingWindow, TaskQueuePacedSender::kNoPacketHoldback);
|
||||
TaskQueuePacedSender pacer(time_controller.GetClock(), &packet_router,
|
||||
/*event_log=*/nullptr,
|
||||
/*field_trials=*/nullptr,
|
||||
time_controller.GetTaskQueueFactory(),
|
||||
kCoalescingWindow, kNoPacketHoldback);
|
||||
|
||||
// Set rates so one packet adds one ms of buffer level.
|
||||
const DataSize kPacketSize = DataSize::Bytes(kDefaultPacketSize);
|
||||
@ -277,11 +278,11 @@ TEST(TaskQueuePacedSenderTest, ProbingOverridesCoalescingWindow) {
|
||||
const TimeDelta kCoalescingWindow = TimeDelta::Millis(5);
|
||||
GlobalSimulatedTimeController time_controller(Timestamp::Millis(1234));
|
||||
MockPacketRouter packet_router;
|
||||
TaskQueuePacedSender pacer(
|
||||
time_controller.GetClock(), &packet_router,
|
||||
/*event_log=*/nullptr,
|
||||
/*field_trials=*/nullptr, time_controller.GetTaskQueueFactory(),
|
||||
kCoalescingWindow, TaskQueuePacedSender::kNoPacketHoldback);
|
||||
TaskQueuePacedSender pacer(time_controller.GetClock(), &packet_router,
|
||||
/*event_log=*/nullptr,
|
||||
/*field_trials=*/nullptr,
|
||||
time_controller.GetTaskQueueFactory(),
|
||||
kCoalescingWindow, kNoPacketHoldback);
|
||||
|
||||
// Set rates so one packet adds one ms of buffer level.
|
||||
const DataSize kPacketSize = DataSize::Bytes(kDefaultPacketSize);
|
||||
@ -305,7 +306,7 @@ TEST(TaskQueuePacedSenderTest, ProbingOverridesCoalescingWindow) {
|
||||
time_controller.AdvanceTime(kCoalescingWindow - TimeDelta::Millis(1));
|
||||
}
|
||||
|
||||
TEST(TaskQueuePacedSenderTest, SchedulesProbeAtSentTime) {
|
||||
TEST(TaskQueuePacedSenderTest, SchedulesProbeAtSetTime) {
|
||||
ScopedFieldTrials trials("WebRTC-Bwe-ProbingBehavior/min_probe_delta:1ms/");
|
||||
GlobalSimulatedTimeController time_controller(Timestamp::Millis(1234));
|
||||
MockPacketRouter packet_router;
|
||||
@ -313,7 +314,7 @@ TEST(TaskQueuePacedSenderTest, SchedulesProbeAtSentTime) {
|
||||
time_controller.GetClock(), &packet_router,
|
||||
/*event_log=*/nullptr,
|
||||
/*field_trials=*/nullptr, time_controller.GetTaskQueueFactory(),
|
||||
PacingController::kMinSleepTime, TaskQueuePacedSender::kNoPacketHoldback);
|
||||
PacingController::kMinSleepTime, kNoPacketHoldback);
|
||||
|
||||
// Set rates so one packet adds 4ms of buffer level.
|
||||
const DataSize kPacketSize = DataSize::Bytes(kDefaultPacketSize);
|
||||
@ -338,16 +339,15 @@ TEST(TaskQueuePacedSenderTest, SchedulesProbeAtSentTime) {
|
||||
// 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
|
||||
// Trigger a probe at 4x the current pacing rate and insert the number of
|
||||
// packets the probe needs.
|
||||
const DataRate kProbeRate = 2 * kPacingDataRate;
|
||||
const int kProbeClusterId = 1;
|
||||
pacer.CreateProbeCluster(kProbeRate, 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.
|
||||
// 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
|
||||
const TimeDelta kProbeTimeDelta = TimeDelta::Millis(2);
|
||||
const DataSize kProbeSize = kProbeRate * kProbeTimeDelta;
|
||||
const size_t kNumPacketsInProbe =
|
||||
@ -381,7 +381,7 @@ TEST(TaskQueuePacedSenderTest, NoMinSleepTimeWhenProbing) {
|
||||
time_controller.GetClock(), &packet_router,
|
||||
/*event_log=*/nullptr,
|
||||
/*field_trials=*/nullptr, time_controller.GetTaskQueueFactory(),
|
||||
PacingController::kMinSleepTime, TaskQueuePacedSender::kNoPacketHoldback);
|
||||
PacingController::kMinSleepTime, kNoPacketHoldback);
|
||||
|
||||
// Set rates so one packet adds 4ms of buffer level.
|
||||
const DataSize kPacketSize = DataSize::Bytes(kDefaultPacketSize);
|
||||
@ -423,8 +423,8 @@ TEST(TaskQueuePacedSenderTest, NoMinSleepTimeWhenProbing) {
|
||||
// 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 = 2 * kMinProbeDelta * kProbingRate;
|
||||
EXPECT_EQ(data_sent, DataSize::Bytes(1) + kPacketSize + 4 * kMinProbeSize);
|
||||
EXPECT_EQ(data_sent,
|
||||
kProbingRate * TimeDelta::Millis(1) + DataSize::Bytes(1));
|
||||
}
|
||||
|
||||
TEST(TaskQueuePacedSenderTest, PacketBasedCoalescing) {
|
||||
@ -534,7 +534,7 @@ TEST(TaskQueuePacedSenderTest, Stats) {
|
||||
time_controller.GetClock(), &packet_router,
|
||||
/*event_log=*/nullptr,
|
||||
/*field_trials=*/nullptr, time_controller.GetTaskQueueFactory(),
|
||||
PacingController::kMinSleepTime, TaskQueuePacedSender::kNoPacketHoldback);
|
||||
PacingController::kMinSleepTime, kNoPacketHoldback);
|
||||
|
||||
// Simulate ~2mbps video stream, covering one second.
|
||||
static constexpr size_t kPacketsToSend = 200;
|
||||
|
||||
Reference in New Issue
Block a user