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0e5501f0ff
experiment was cleaned up in https://webrtc-review.googlesource.com/c/src/+/284922 Bug: webrtc:4711 Change-Id: I19e1ba9716a5b0375fa4c5cf8c69e6bb2b03de6b Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/299041 Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Per Kjellander <perkj@webrtc.org> Cr-Commit-Position: refs/heads/main@{#39671}
103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
/*
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* Copyright (c) 2012 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/remote_bitrate_estimator/overuse_detector.h"
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#include <math.h>
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#include <stdio.h>
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#include <algorithm>
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#include <string>
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#include "modules/remote_bitrate_estimator/test/bwe_test_logging.h"
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#include "rtc_base/checks.h"
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#include "rtc_base/numerics/safe_minmax.h"
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namespace webrtc {
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namespace {
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constexpr double kMaxAdaptOffsetMs = 15.0;
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constexpr double kOverUsingTimeThreshold = 10;
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constexpr int kMaxNumDeltas = 60;
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constexpr double kUp = 0.0087;
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constexpr double kDown = 0.039;
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} // namespace
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OveruseDetector::OveruseDetector() = default;
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BandwidthUsage OveruseDetector::State() const {
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return hypothesis_;
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}
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BandwidthUsage OveruseDetector::Detect(double offset,
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double ts_delta,
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int num_of_deltas,
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int64_t now_ms) {
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if (num_of_deltas < 2) {
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return BandwidthUsage::kBwNormal;
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}
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const double T = std::min(num_of_deltas, kMaxNumDeltas) * offset;
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BWE_TEST_LOGGING_PLOT(1, "T", now_ms, T);
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BWE_TEST_LOGGING_PLOT(1, "threshold", now_ms, threshold_);
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if (T > threshold_) {
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if (time_over_using_ == -1) {
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// Initialize the timer. Assume that we've been
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// over-using half of the time since the previous
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// sample.
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time_over_using_ = ts_delta / 2;
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} else {
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// Increment timer
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time_over_using_ += ts_delta;
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}
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overuse_counter_++;
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if (time_over_using_ > kOverUsingTimeThreshold && overuse_counter_ > 1) {
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if (offset >= prev_offset_) {
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time_over_using_ = 0;
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overuse_counter_ = 0;
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hypothesis_ = BandwidthUsage::kBwOverusing;
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}
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}
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} else if (T < -threshold_) {
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time_over_using_ = -1;
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overuse_counter_ = 0;
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hypothesis_ = BandwidthUsage::kBwUnderusing;
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} else {
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time_over_using_ = -1;
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overuse_counter_ = 0;
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hypothesis_ = BandwidthUsage::kBwNormal;
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}
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prev_offset_ = offset;
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UpdateThreshold(T, now_ms);
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return hypothesis_;
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}
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void OveruseDetector::UpdateThreshold(double modified_offset, int64_t now_ms) {
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if (last_update_ms_ == -1)
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last_update_ms_ = now_ms;
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if (fabs(modified_offset) > threshold_ + kMaxAdaptOffsetMs) {
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// Avoid adapting the threshold to big latency spikes, caused e.g.,
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// by a sudden capacity drop.
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last_update_ms_ = now_ms;
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return;
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}
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const double k = fabs(modified_offset) < threshold_ ? kDown : kUp;
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const int64_t kMaxTimeDeltaMs = 100;
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int64_t time_delta_ms = std::min(now_ms - last_update_ms_, kMaxTimeDeltaMs);
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threshold_ += k * (fabs(modified_offset) - threshold_) * time_delta_ms;
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threshold_ = rtc::SafeClamp(threshold_, 6.f, 600.f);
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last_update_ms_ = now_ms;
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}
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} // namespace webrtc
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