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944dacec25
All usages compare the budget usage to ratios, so we can skip a few multiplications. Bug: webrtc:10719 Change-Id: I0205d74762043d972c087c152915e4fdd9510057 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/140289 Commit-Queue: Jonas Olsson <jonasolsson@webrtc.org> Reviewed-by: Sebastian Jansson <srte@webrtc.org> Cr-Commit-Position: refs/heads/master@{#28190}
122 lines
4.3 KiB
C++
122 lines
4.3 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/congestion_controller/goog_cc/alr_detector.h"
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#include <cstdint>
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#include <cstdio>
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#include "absl/memory/memory.h"
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#include "logging/rtc_event_log/events/rtc_event.h"
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#include "logging/rtc_event_log/events/rtc_event_alr_state.h"
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#include "logging/rtc_event_log/rtc_event_log.h"
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#include "rtc_base/checks.h"
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#include "rtc_base/numerics/safe_conversions.h"
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#include "rtc_base/time_utils.h"
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namespace webrtc {
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namespace {
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absl::optional<AlrExperimentSettings> GetExperimentSettings(
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const WebRtcKeyValueConfig* key_value_config) {
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RTC_CHECK(AlrExperimentSettings::MaxOneFieldTrialEnabled(*key_value_config));
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absl::optional<AlrExperimentSettings> experiment_settings =
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AlrExperimentSettings::CreateFromFieldTrial(
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*key_value_config,
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AlrExperimentSettings::kScreenshareProbingBweExperimentName);
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if (!experiment_settings) {
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experiment_settings = AlrExperimentSettings::CreateFromFieldTrial(
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*key_value_config,
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AlrExperimentSettings::kStrictPacingAndProbingExperimentName);
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}
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return experiment_settings;
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}
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} // namespace
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AlrDetector::AlrDetector(const WebRtcKeyValueConfig* key_value_config)
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: AlrDetector(key_value_config,
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nullptr,
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GetExperimentSettings(key_value_config)) {}
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AlrDetector::AlrDetector(const WebRtcKeyValueConfig* key_value_config,
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RtcEventLog* event_log)
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: AlrDetector(key_value_config,
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event_log,
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GetExperimentSettings(key_value_config)) {}
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AlrDetector::AlrDetector(
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const WebRtcKeyValueConfig* key_value_config,
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RtcEventLog* event_log,
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absl::optional<AlrExperimentSettings> experiment_settings)
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: bandwidth_usage_ratio_(
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"bw_usage",
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experiment_settings
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? experiment_settings->alr_bandwidth_usage_percent / 100.0
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: kDefaultBandwidthUsageRatio),
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start_budget_level_ratio_(
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"start",
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experiment_settings
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? experiment_settings->alr_start_budget_level_percent / 100.0
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: kDefaultStartBudgetLevelRatio),
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stop_budget_level_ratio_(
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"stop",
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experiment_settings
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? experiment_settings->alr_stop_budget_level_percent / 100.0
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: kDefaultStopBudgetLevelRatio),
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alr_budget_(0, true),
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event_log_(event_log) {
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ParseFieldTrial({&bandwidth_usage_ratio_, &start_budget_level_ratio_,
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&stop_budget_level_ratio_},
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key_value_config->Lookup("WebRTC-AlrDetectorParameters"));
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}
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AlrDetector::~AlrDetector() {}
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void AlrDetector::OnBytesSent(size_t bytes_sent, int64_t send_time_ms) {
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if (!last_send_time_ms_.has_value()) {
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last_send_time_ms_ = send_time_ms;
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// Since the duration for sending the bytes is unknwon, return without
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// updating alr state.
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return;
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}
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int64_t delta_time_ms = send_time_ms - *last_send_time_ms_;
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last_send_time_ms_ = send_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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bool state_changed = false;
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if (alr_budget_.budget_ratio() > start_budget_level_ratio_ &&
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!alr_started_time_ms_) {
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alr_started_time_ms_.emplace(rtc::TimeMillis());
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state_changed = true;
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} else if (alr_budget_.budget_ratio() < stop_budget_level_ratio_ &&
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alr_started_time_ms_) {
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state_changed = true;
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alr_started_time_ms_.reset();
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}
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if (event_log_ && state_changed) {
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event_log_->Log(
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absl::make_unique<RtcEventAlrState>(alr_started_time_ms_.has_value()));
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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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int target_rate_kbps =
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static_cast<double>(bitrate_bps) * bandwidth_usage_ratio_ / 1000;
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alr_budget_.set_target_rate_kbps(target_rate_kbps);
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}
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absl::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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