a78a94e838
BUG=4442 R=mflodman@webrtc.org, pbos@webrtc.org Review URL: https://webrtc-codereview.appspot.com/43829004 Cr-Commit-Position: refs/heads/master@{#8751} git-svn-id: http://webrtc.googlecode.com/svn/trunk@8751 4adac7df-926f-26a2-2b94-8c16560cd09d
65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
/*
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* Copyright 2004 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 "webrtc/base/ratetracker.h"
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#include "webrtc/base/timeutils.h"
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namespace rtc {
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RateTracker::RateTracker()
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: total_units_(0), units_second_(0),
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last_units_second_time_(~0u),
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last_units_second_calc_(0) {
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}
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size_t RateTracker::total_units() const {
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return total_units_;
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}
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size_t RateTracker::units_second() {
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// Snapshot units / second calculator. Determine how many seconds have
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// elapsed since our last reference point. If over 1 second, establish
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// a new reference point that is an integer number of seconds since the
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// last one, and compute the units over that interval.
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uint32 current_time = Time();
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if (last_units_second_time_ == ~0u) {
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last_units_second_time_ = current_time;
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last_units_second_calc_ = total_units_;
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} else {
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int delta = rtc::TimeDiff(current_time, last_units_second_time_);
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if (delta >= 1000) {
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int fraction_time = delta % 1000;
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int seconds = delta / 1000;
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int fraction_units =
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static_cast<int>(total_units_ - last_units_second_calc_) *
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fraction_time / delta;
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// Compute "units received during the interval" / "seconds in interval"
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units_second_ =
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(total_units_ - last_units_second_calc_ - fraction_units) / seconds;
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last_units_second_time_ = current_time - fraction_time;
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last_units_second_calc_ = total_units_ - fraction_units;
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}
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}
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return units_second_;
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}
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void RateTracker::Update(size_t units) {
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if (last_units_second_time_ == ~0u)
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last_units_second_time_ = Time();
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total_units_ += units;
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}
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uint32 RateTracker::Time() const {
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return rtc::Time();
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}
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} // namespace rtc
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