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b378a22544
Bug: chromium:770429 Change-Id: Ic869e74ec7086f5a2cb3968c0d2335fd7df7f618 Reviewed-on: https://webrtc-review.googlesource.com/5483 Reviewed-by: Philip Eliasson <philipel@webrtc.org> Commit-Queue: Erik Språng <sprang@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20076}
121 lines
4.5 KiB
C++
121 lines
4.5 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 "modules/pacing/alr_detector.h"
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#include <string>
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#include "rtc_base/checks.h"
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#include "rtc_base/format_macros.h"
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#include "rtc_base/logging.h"
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#include "rtc_base/timeutils.h"
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#include "system_wrappers/include/field_trial.h"
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namespace webrtc {
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const char AlrDetector::kScreenshareProbingBweExperimentName[] =
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"WebRTC-ProbingScreenshareBwe";
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const char AlrDetector::kStrictPacingAndProbingExperimentName[] =
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"WebRTC-StrictPacingAndProbing";
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AlrDetector::AlrDetector()
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: bandwidth_usage_percent_(kDefaultAlrBandwidthUsagePercent),
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alr_start_budget_level_percent_(kDefaultAlrStartBudgetLevelPercent),
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alr_stop_budget_level_percent_(kDefaultAlrStopBudgetLevelPercent),
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alr_budget_(0, true) {
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RTC_CHECK(
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field_trial::FindFullName(kStrictPacingAndProbingExperimentName)
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.empty() ||
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field_trial::FindFullName(kScreenshareProbingBweExperimentName).empty());
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rtc::Optional<AlrExperimentSettings> experiment_settings =
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ParseAlrSettingsFromFieldTrial(kScreenshareProbingBweExperimentName);
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if (!experiment_settings) {
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experiment_settings =
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ParseAlrSettingsFromFieldTrial(kStrictPacingAndProbingExperimentName);
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}
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if (experiment_settings) {
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alr_stop_budget_level_percent_ =
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experiment_settings->alr_stop_budget_level_percent;
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alr_start_budget_level_percent_ =
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experiment_settings->alr_start_budget_level_percent;
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bandwidth_usage_percent_ = experiment_settings->alr_bandwidth_usage_percent;
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}
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}
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AlrDetector::~AlrDetector() {}
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void AlrDetector::OnBytesSent(size_t bytes_sent, int64_t delta_time_ms) {
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alr_budget_.UseBudget(bytes_sent);
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alr_budget_.IncreaseBudget(delta_time_ms);
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if (alr_budget_.budget_level_percent() > alr_start_budget_level_percent_ &&
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!alr_started_time_ms_) {
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alr_started_time_ms_.emplace(rtc::TimeMillis());
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} else if (alr_budget_.budget_level_percent() <
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alr_stop_budget_level_percent_ &&
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alr_started_time_ms_) {
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alr_started_time_ms_.reset();
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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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const auto target_rate_kbps = int64_t{bitrate_bps} *
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bandwidth_usage_percent_ / (1000 * 100);
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alr_budget_.set_target_rate_kbps(rtc::dchecked_cast<int>(target_rate_kbps));
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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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rtc::Optional<AlrDetector::AlrExperimentSettings>
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AlrDetector::ParseAlrSettingsFromFieldTrial(const char* experiment_name) {
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rtc::Optional<AlrExperimentSettings> ret;
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std::string group_name = field_trial::FindFullName(experiment_name);
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const std::string kIgnoredSuffix = "_Dogfood";
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std::string::size_type suffix_pos = group_name.rfind(kIgnoredSuffix);
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if (suffix_pos != std::string::npos &&
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suffix_pos == group_name.length() - kIgnoredSuffix.length()) {
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group_name.resize(group_name.length() - kIgnoredSuffix.length());
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}
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if (group_name.empty())
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return ret;
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AlrExperimentSettings settings;
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if (sscanf(group_name.c_str(), "%f,%" PRId64 ",%d,%d,%d,%d",
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&settings.pacing_factor, &settings.max_paced_queue_time,
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&settings.alr_bandwidth_usage_percent,
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&settings.alr_start_budget_level_percent,
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&settings.alr_stop_budget_level_percent,
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&settings.group_id) == 6) {
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ret.emplace(settings);
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LOG(LS_INFO) << "Using ALR experiment settings: "
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"pacing factor: "
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<< settings.pacing_factor << ", max pacer queue length: "
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<< settings.max_paced_queue_time
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<< ", ALR start bandwidth usage percent: "
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<< settings.alr_bandwidth_usage_percent
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<< ", ALR end budget level percent: "
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<< settings.alr_start_budget_level_percent
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<< ", ALR end budget level percent: "
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<< settings.alr_stop_budget_level_percent
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<< ", ALR experiment group ID: " << settings.group_id;
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} else {
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LOG(LS_INFO) << "Failed to parse ALR experiment: " << experiment_name;
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}
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return ret;
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}
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} // namespace webrtc
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