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Add ability to control TaskQueuePacedSender holdback window.

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Holdback window can be specified as absolute time and in terms of packet
send times. Example:
WebRTC-TaskQueuePacer/Enabled,holdback_window:20ms,holdback_packet:3/

If current conditions have us running with 2000kbps pacing rate and
1250byte (10kbit) packets, each packet send time is 5ms.
The holdback window would then be min(20ms, 3*5ms) = 15ms.

The default is like before 1ms and packets no take into account when
TQ pacer is used, parameters have no effect with legacy process thread
pacer.

Bug: webrtc:10809
Change-Id: I800de05107e2d4df461eabaaf1ca04fb4c5de51e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/233421
Commit-Queue: Erik Språng <sprang@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35266}
This commit is contained in:
Erik Språng
2021-10-26 16:19:03 +02:00
committed by WebRTC LUCI CQ
parent 7bb853f549
commit 0f86c1f125
7 changed files with 602 additions and 459 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
call/rtp_transport_controller_send.h
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@ -128,6 +128,16 @@ class RtpTransportControllerSend final
void OnRemoteNetworkEstimate(NetworkStateEstimate estimate) override;
private:
struct PacerSettings {
explicit PacerSettings(const WebRtcKeyValueConfig* trials);
bool use_task_queue_pacer() const { return !tq_disabled.Get(); }
FieldTrialFlag tq_disabled; // Kill-switch not normally used.
FieldTrialParameter<TimeDelta> holdback_window;
FieldTrialParameter<int> holdback_packets;
};
void MaybeCreateControllers() RTC_RUN_ON(task_queue_);
void UpdateInitialConstraints(TargetRateConstraints new_contraints)
RTC_RUN_ON(task_queue_);
@ -158,7 +168,7 @@ class RtpTransportControllerSend final
std::map<std::string, rtc::NetworkRoute> network_routes_;
bool pacer_started_;
const std::unique_ptr<ProcessThread> process_thread_;
const bool use_task_queue_pacer_;
const PacerSettings pacer_settings_;
std::unique_ptr<PacedSender> process_thread_pacer_;
std::unique_ptr<TaskQueuePacedSender> task_queue_pacer_;