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92ea95e34a
In https://webrtc-review.googlesource.com/c/src/+/1560 we moved WebRTC from src/webrtc to src/ (in order to preserve an healthy git history). This CL takes care of fixing header guards, #include paths, etc... NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true TBR=tommi@webrtc.org Bug: chromium:611808 Change-Id: Iea91618212bee0af16aa3f05071eab8f93706578 Reviewed-on: https://webrtc-review.googlesource.com/1561 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Henrik Kjellander <kjellander@webrtc.org> Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#19846}
118 lines
4.1 KiB
C++
118 lines
4.1 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/audio_coding/neteq/delay_peak_detector.h"
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#include <algorithm> // max
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#include "rtc_base/checks.h"
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#include "rtc_base/safe_conversions.h"
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namespace webrtc {
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// The DelayPeakDetector keeps track of severe inter-arrival times, called
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// delay peaks. When a peak is observed, the "height" (the time elapsed since
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// the previous packet arrival) and the peak "period" (the time since the last
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// observed peak) is recorded in a vector. When enough peaks have been observed,
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// peak-mode is engaged and the DelayManager asks the DelayPeakDetector for
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// the worst peak height.
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DelayPeakDetector::~DelayPeakDetector() = default;
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DelayPeakDetector::DelayPeakDetector(const TickTimer* tick_timer)
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: peak_found_(false),
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peak_detection_threshold_(0),
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tick_timer_(tick_timer) {
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RTC_DCHECK(!peak_period_stopwatch_);
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}
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void DelayPeakDetector::Reset() {
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peak_period_stopwatch_.reset();
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peak_found_ = false;
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peak_history_.clear();
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}
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// Calculates the threshold in number of packets.
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void DelayPeakDetector::SetPacketAudioLength(int length_ms) {
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if (length_ms > 0) {
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peak_detection_threshold_ = kPeakHeightMs / length_ms;
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}
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}
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bool DelayPeakDetector::peak_found() {
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return peak_found_;
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}
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int DelayPeakDetector::MaxPeakHeight() const {
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int max_height = -1; // Returns -1 for an empty history.
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std::list<Peak>::const_iterator it;
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for (it = peak_history_.begin(); it != peak_history_.end(); ++it) {
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max_height = std::max(max_height, it->peak_height_packets);
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}
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return max_height;
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}
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uint64_t DelayPeakDetector::MaxPeakPeriod() const {
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auto max_period_element = std::max_element(
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peak_history_.begin(), peak_history_.end(),
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[](Peak a, Peak b) { return a.period_ms < b.period_ms; });
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if (max_period_element == peak_history_.end()) {
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return 0; // |peak_history_| is empty.
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}
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RTC_DCHECK_GT(max_period_element->period_ms, 0);
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return max_period_element->period_ms;
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}
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bool DelayPeakDetector::Update(int inter_arrival_time, int target_level) {
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if (inter_arrival_time > target_level + peak_detection_threshold_ ||
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inter_arrival_time > 2 * target_level) {
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// A delay peak is observed.
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if (!peak_period_stopwatch_) {
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// This is the first peak. Reset the period counter.
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peak_period_stopwatch_ = tick_timer_->GetNewStopwatch();
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} else if (peak_period_stopwatch_->ElapsedMs() > 0) {
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if (peak_period_stopwatch_->ElapsedMs() <= kMaxPeakPeriodMs) {
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// This is not the first peak, and the period is valid.
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// Store peak data in the vector.
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Peak peak_data;
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peak_data.period_ms = peak_period_stopwatch_->ElapsedMs();
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peak_data.peak_height_packets = inter_arrival_time;
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peak_history_.push_back(peak_data);
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while (peak_history_.size() > kMaxNumPeaks) {
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// Delete the oldest data point.
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peak_history_.pop_front();
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}
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peak_period_stopwatch_ = tick_timer_->GetNewStopwatch();
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} else if (peak_period_stopwatch_->ElapsedMs() <= 2 * kMaxPeakPeriodMs) {
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// Invalid peak due to too long period. Reset period counter and start
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// looking for next peak.
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peak_period_stopwatch_ = tick_timer_->GetNewStopwatch();
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} else {
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// More than 2 times the maximum period has elapsed since the last peak
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// was registered. It seams that the network conditions have changed.
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// Reset the peak statistics.
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Reset();
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}
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}
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}
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return CheckPeakConditions();
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}
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bool DelayPeakDetector::CheckPeakConditions() {
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size_t s = peak_history_.size();
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if (s >= kMinPeaksToTrigger &&
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peak_period_stopwatch_->ElapsedMs() <= 2 * MaxPeakPeriod()) {
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peak_found_ = true;
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} else {
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peak_found_ = false;
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}
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return peak_found_;
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}
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} // namespace webrtc
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