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/*
* Copyright (c) 2012 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 "webrtc/modules/remote_bitrate_estimator/overuse_detector.h"
#include <algorithm>
#include <math.h>
#include <stdlib.h>
#include "webrtc/modules/remote_bitrate_estimator/include/bwe_defines.h"
#include "webrtc/modules/rtp_rtcp/source/rtp_utility.h"
#include "webrtc/system_wrappers/interface/trace.h"
namespace webrtc {
enum { kOverUsingTimeThreshold = 100 };
OveruseDetector::OveruseDetector(const OverUseDetectorOptions& options)
: options_(options),
threshold_(options_.initial_threshold),
prev_offset_(0.0),
time_over_using_(-1),
overuse_counter_(0),
hypothesis_(kBwNormal) {}
OveruseDetector::~OveruseDetector() {}
BandwidthUsage OveruseDetector::State() const {
return hypothesis_;
}
void OveruseDetector::SetRateControlRegion(RateControlRegion region) {
switch (region) {
case kRcMaxUnknown: {
threshold_ = options_.initial_threshold;
break;
}
case kRcAboveMax:
case kRcNearMax: {
threshold_ = options_.initial_threshold / 2;
break;
}
}
}
BandwidthUsage OveruseDetector::Detect(double offset, double ts_delta,
int num_of_deltas) {
if (num_of_deltas < 2) {
return kBwNormal;
}
const double prev_offset = prev_offset_;
prev_offset_ = offset;
const double T = std::min(num_of_deltas, 60) * offset;
if (T > threshold_) {
if (time_over_using_ == -1) {
// Initialize the timer. Assume that we've been
// over-using half of the time since the previous
// sample.
time_over_using_ = ts_delta / 2;
} else {
// Increment timer
time_over_using_ += ts_delta;
}
overuse_counter_++;
if (time_over_using_ > kOverUsingTimeThreshold
&& overuse_counter_ > 1) {
if (offset >= prev_offset) {
time_over_using_ = 0;
overuse_counter_ = 0;
hypothesis_ = kBwOverusing;
}
}
} else if (T < -threshold_) {
time_over_using_ = -1;
overuse_counter_ = 0;
hypothesis_ = kBwUnderusing;
} else {
time_over_using_ = -1;
overuse_counter_ = 0;
hypothesis_ = kBwNormal;
}
return hypothesis_;
}
} // namespace webrtc
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