probe_bitrate_estimator.cc | Explore in Territory

/*
 *  Copyright (c) 2016 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.
 */

#include "modules/congestion_controller/goog_cc/probe_bitrate_estimator.h"

#include <algorithm>
#include <memory>

#include "absl/types/optional.h"
#include "api/rtc_event_log/rtc_event_log.h"
#include "api/transport/network_types.h"
#include "api/units/data_rate.h"
#include "api/units/data_size.h"
#include "api/units/time_delta.h"
#include "api/units/timestamp.h"
#include "logging/rtc_event_log/events/rtc_event_probe_result_failure.h"
#include "logging/rtc_event_log/events/rtc_event_probe_result_success.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"

namespace webrtc {
namespace {
// The minumum number of probes we need to receive feedback about in percent
// in order to have a valid estimate.
constexpr double kMinReceivedProbesRatio = …;

// The minumum number of bytes we need to receive feedback about in percent
// in order to have a valid estimate.
constexpr double kMinReceivedBytesRatio = …;

// The maximum |receive rate| / |send rate| ratio for a valid estimate.
constexpr float kMaxValidRatio = …;

// The minimum |receive rate| / |send rate| ratio assuming that the link is
// not saturated, i.e. we assume that we will receive at least
// kMinRatioForUnsaturatedLink * |send rate| if |send rate| is less than the
// link capacity.
constexpr float kMinRatioForUnsaturatedLink = …;

// The target utilization of the link. If we know true link capacity
// we'd like to send at 95% of that rate.
constexpr float kTargetUtilizationFraction = …;

// The maximum time period over which the cluster history is retained.
// This is also the maximum time period beyond which a probing burst is not
// expected to last.
constexpr TimeDelta kMaxClusterHistory = …;

// The maximum time interval between first and the last probe on a cluster
// on the sender side as well as the receive side.
constexpr TimeDelta kMaxProbeInterval = …;

}  // namespace

ProbeBitrateEstimator::ProbeBitrateEstimator(RtcEventLog* event_log)
    : … { … }

ProbeBitrateEstimator::~ProbeBitrateEstimator() = default;

absl::optional<DataRate> ProbeBitrateEstimator::HandleProbeAndEstimateBitrate(
    const PacketResult& packet_feedback) { … }

absl::optional<DataRate>
ProbeBitrateEstimator::FetchAndResetLastEstimatedBitrate() { … }

void ProbeBitrateEstimator::EraseOldClusters(Timestamp timestamp) { … }
}  // namespace webrtc
chromium/third_party/webrtc/modules/congestion_controller/goog_cc/probe_bitrate_estimator.cc
