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c4a205c7fa
Bug: None Change-Id: I5388bc018d7ddd285d154436b5fc52a15469a97d Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/319220 Reviewed-by: Erik Språng <sprang@webrtc.org> Reviewed-by: Per Kjellander <perkj@webrtc.org> Commit-Queue: Björn Terelius <terelius@webrtc.org> Cr-Commit-Position: refs/heads/main@{#40710}
92 lines
3.4 KiB
C++
92 lines
3.4 KiB
C++
/*
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* Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_CONGESTION_CONTROLLER_GOOG_CC_INTER_ARRIVAL_DELTA_H_
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#define MODULES_CONGESTION_CONTROLLER_GOOG_CC_INTER_ARRIVAL_DELTA_H_
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#include <cstddef>
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#include "api/units/time_delta.h"
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#include "api/units/timestamp.h"
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namespace webrtc {
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// Helper class to compute the inter-arrival time delta and the size delta
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// between two send bursts. This code is branched from
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// modules/remote_bitrate_estimator/inter_arrival.
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class InterArrivalDelta {
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public:
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// After this many packet groups received out of order InterArrival will
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// reset, assuming that clocks have made a jump.
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static constexpr int kReorderedResetThreshold = 3;
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static constexpr TimeDelta kArrivalTimeOffsetThreshold =
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TimeDelta::Seconds(3);
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// A send time group is defined as all packets with a send time which are at
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// most send_time_group_length older than the first timestamp in that
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// group.
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explicit InterArrivalDelta(TimeDelta send_time_group_length);
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InterArrivalDelta() = delete;
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InterArrivalDelta(const InterArrivalDelta&) = delete;
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InterArrivalDelta& operator=(const InterArrivalDelta&) = delete;
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// This function returns true if a delta was computed, or false if the current
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// group is still incomplete or if only one group has been completed.
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// `send_time` is the send time.
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// `arrival_time` is the time at which the packet arrived.
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// `packet_size` is the size of the packet.
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// `timestamp_delta` (output) is the computed send time delta.
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// `arrival_time_delta` (output) is the computed arrival-time delta.
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// `packet_size_delta` (output) is the computed size delta.
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bool ComputeDeltas(Timestamp send_time,
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Timestamp arrival_time,
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Timestamp system_time,
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size_t packet_size,
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TimeDelta* send_time_delta,
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TimeDelta* arrival_time_delta,
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int* packet_size_delta);
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private:
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struct SendTimeGroup {
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SendTimeGroup()
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: size(0),
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first_send_time(Timestamp::MinusInfinity()),
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send_time(Timestamp::MinusInfinity()),
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first_arrival(Timestamp::MinusInfinity()),
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complete_time(Timestamp::MinusInfinity()),
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last_system_time(Timestamp::MinusInfinity()) {}
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bool IsFirstPacket() const { return complete_time.IsInfinite(); }
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size_t size;
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Timestamp first_send_time;
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Timestamp send_time;
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Timestamp first_arrival;
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Timestamp complete_time;
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Timestamp last_system_time;
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};
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// Returns true if the last packet was the end of the current batch and the
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// packet with `send_time` is the first of a new batch.
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bool NewTimestampGroup(Timestamp arrival_time, Timestamp send_time) const;
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bool BelongsToBurst(Timestamp arrival_time, Timestamp send_time) const;
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void Reset();
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const TimeDelta send_time_group_length_;
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SendTimeGroup current_timestamp_group_;
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SendTimeGroup prev_timestamp_group_;
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int num_consecutive_reordered_packets_;
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};
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} // namespace webrtc
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#endif // MODULES_CONGESTION_CONTROLLER_GOOG_CC_INTER_ARRIVAL_DELTA_H_
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