mirror of
https://github.com/mollyim/webrtc.git
synced 2025-05-14 14:20:45 +01:00
ea969d287b
This time the class is added but only used if the field trial "WebRTC-Bwe-NewInterArrivalDelta/Enabled/" is enabled. Original cl description: This cl copies modules/remote_bitrate_estimator/inter_arrival.x to inter_arrival.h and interrival_delta.cc in goog_cc but modified to use webrtc::Timestamp and webrtc::Timedelta in order to avoid having to use 24 bit time repressentation. patchset 1 is a pure revert of the revert https://webrtc-review.googlesource.com/c/src/+/196343 patchset 2 contains a modification to allow running it behind an experiment. Bug: webrtc:12269 Change-Id: Ide80e9f5243362799a2cc1f0fcf7e613e707d851 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/196502 Commit-Queue: Per Kjellander <perkj@webrtc.org> Reviewed-by: Christoffer Rodbro <crodbro@webrtc.org> Cr-Commit-Position: refs/heads/master@{#32784}
90 lines
3.4 KiB
C++
90 lines
3.4 KiB
C++
/*
|
|
* Copyright (c) 2020 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.
|
|
*/
|
|
|
|
#ifndef MODULES_CONGESTION_CONTROLLER_GOOG_CC_INTER_ARRIVAL_DELTA_H_
|
|
#define MODULES_CONGESTION_CONTROLLER_GOOG_CC_INTER_ARRIVAL_DELTA_H_
|
|
|
|
#include "api/units/time_delta.h"
|
|
#include "api/units/timestamp.h"
|
|
|
|
namespace webrtc {
|
|
|
|
// Helper class to compute the inter-arrival time delta and the size delta
|
|
// between two send bursts. This code is branched from
|
|
// modules/remote_bitrate_estimator/inter_arrival.
|
|
class InterArrivalDelta {
|
|
public:
|
|
// After this many packet groups received out of order InterArrival will
|
|
// reset, assuming that clocks have made a jump.
|
|
static constexpr int kReorderedResetThreshold = 3;
|
|
static constexpr TimeDelta kArrivalTimeOffsetThreshold =
|
|
TimeDelta::Seconds(3);
|
|
|
|
// A send time group is defined as all packets with a send time which are at
|
|
// most send_time_group_length older than the first timestamp in that
|
|
// group.
|
|
explicit InterArrivalDelta(TimeDelta send_time_group_length);
|
|
|
|
InterArrivalDelta() = delete;
|
|
InterArrivalDelta(const InterArrivalDelta&) = delete;
|
|
InterArrivalDelta& operator=(const InterArrivalDelta&) = delete;
|
|
|
|
// This function returns true if a delta was computed, or false if the current
|
|
// group is still incomplete or if only one group has been completed.
|
|
// |send_time| is the send time.
|
|
// |arrival_time| is the time at which the packet arrived.
|
|
// |packet_size| is the size of the packet.
|
|
// |timestamp_delta| (output) is the computed send time delta.
|
|
// |arrival_time_delta_ms| (output) is the computed arrival-time delta.
|
|
// |packet_size_delta| (output) is the computed size delta.
|
|
bool ComputeDeltas(Timestamp send_time,
|
|
Timestamp arrival_time,
|
|
Timestamp system_time,
|
|
size_t packet_size,
|
|
TimeDelta* send_time_delta,
|
|
TimeDelta* arrival_time_delta,
|
|
int* packet_size_delta);
|
|
|
|
private:
|
|
struct SendTimeGroup {
|
|
SendTimeGroup()
|
|
: size(0),
|
|
first_send_time(Timestamp::MinusInfinity()),
|
|
send_time(Timestamp::MinusInfinity()),
|
|
first_arrival(Timestamp::MinusInfinity()),
|
|
complete_time(Timestamp::MinusInfinity()),
|
|
last_system_time(Timestamp::MinusInfinity()) {}
|
|
|
|
bool IsFirstPacket() const { return complete_time.IsInfinite(); }
|
|
|
|
size_t size;
|
|
Timestamp first_send_time;
|
|
Timestamp send_time;
|
|
Timestamp first_arrival;
|
|
Timestamp complete_time;
|
|
Timestamp last_system_time;
|
|
};
|
|
|
|
// Returns true if the last packet was the end of the current batch and the
|
|
// packet with |send_time| is the first of a new batch.
|
|
bool NewTimestampGroup(Timestamp arrival_time, Timestamp send_time) const;
|
|
|
|
bool BelongsToBurst(Timestamp arrival_time, Timestamp send_time) const;
|
|
|
|
void Reset();
|
|
|
|
const TimeDelta send_time_group_length_;
|
|
SendTimeGroup current_timestamp_group_;
|
|
SendTimeGroup prev_timestamp_group_;
|
|
int num_consecutive_reordered_packets_;
|
|
};
|
|
} // namespace webrtc
|
|
|
|
#endif // MODULES_CONGESTION_CONTROLLER_GOOG_CC_INTER_ARRIVAL_DELTA_H_
|