f00497c573
This means that smaller probe packets will be allowed at lower bitrates. BUG=webrtc:7043 Review-Url: https://codereview.webrtc.org/2650393002 Cr-Commit-Position: refs/heads/master@{#16317}
65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
/*
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* Copyright (c) 2016 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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#include "webrtc/modules/pacing/alr_detector.h"
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#include "webrtc/base/checks.h"
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#include "webrtc/base/logging.h"
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namespace {
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// Time period over which outgoing traffic is measured.
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constexpr int kMeasurementPeriodMs = 500;
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// Sent traffic percentage as a function of network capacity used to determine
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// application-limited region. ALR region start when bandwidth usage drops below
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// kAlrStartUsagePercent and ends when it raises above kAlrEndUsagePercent.
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// NOTE: This is intentionally conservative at the moment until BW adjustments
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// of application limited region is fine tuned.
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constexpr int kAlrStartUsagePercent = 60;
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constexpr int kAlrEndUsagePercent = 70;
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} // namespace
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namespace webrtc {
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AlrDetector::AlrDetector()
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: rate_(kMeasurementPeriodMs, RateStatistics::kBpsScale) {}
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AlrDetector::~AlrDetector() {}
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void AlrDetector::OnBytesSent(size_t bytes_sent, int64_t now_ms) {
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RTC_DCHECK(estimated_bitrate_bps_);
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rate_.Update(bytes_sent, now_ms);
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rtc::Optional<uint32_t> rate = rate_.Rate(now_ms);
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if (!rate)
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return;
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int percentage = static_cast<int>(*rate) * 100 / estimated_bitrate_bps_;
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if (percentage < kAlrStartUsagePercent && !alr_started_time_ms_) {
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alr_started_time_ms_ = rtc::Optional<int64_t>(now_ms);
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} else if (percentage > kAlrEndUsagePercent && alr_started_time_ms_) {
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alr_started_time_ms_ = rtc::Optional<int64_t>();
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}
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}
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void AlrDetector::SetEstimatedBitrate(int bitrate_bps) {
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RTC_DCHECK(bitrate_bps);
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estimated_bitrate_bps_ = bitrate_bps;
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}
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rtc::Optional<int64_t> AlrDetector::GetApplicationLimitedRegionStartTime()
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const {
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return alr_started_time_ms_;
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}
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} // namespace webrtc
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