147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org/* 247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * Copyright 2004 The WebRTC Project Authors. All rights reserved. 347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * 447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * Use of this source code is governed by a BSD-style license 547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * that can be found in the LICENSE file in the root of the source 647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * tree. An additional intellectual property rights grant can be found 747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * in the file PATENTS. All contributing project authors may 847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * be found in the AUTHORS file in the root of the source tree. 947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org */ 1047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 1147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org#include "webrtc/base/ratetracker.h" 1247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org#include "webrtc/base/timeutils.h" 1347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 1447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.orgnamespace rtc { 1547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 1647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.orgRateTracker::RateTracker() 1747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org : total_units_(0), units_second_(0), 1847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org last_units_second_time_(static_cast<uint32>(-1)), 1947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org last_units_second_calc_(0) { 2047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org} 2147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 2247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.orgsize_t RateTracker::total_units() const { 2347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org return total_units_; 2447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org} 2547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 2647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.orgsize_t RateTracker::units_second() { 2747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org // Snapshot units / second calculator. Determine how many seconds have 2847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org // elapsed since our last reference point. If over 1 second, establish 2947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org // a new reference point that is an integer number of seconds since the 3047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org // last one, and compute the units over that interval. 3147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org uint32 current_time = Time(); 3247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org if (last_units_second_time_ != static_cast<uint32>(-1)) { 3347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org int delta = rtc::TimeDiff(current_time, last_units_second_time_); 3447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org if (delta >= 1000) { 3547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org int fraction_time = delta % 1000; 3647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org int seconds = delta / 1000; 3747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org int fraction_units = 3847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org static_cast<int>(total_units_ - last_units_second_calc_) * 3947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org fraction_time / delta; 4047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org // Compute "units received during the interval" / "seconds in interval" 4147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org units_second_ = 4247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org (total_units_ - last_units_second_calc_ - fraction_units) / seconds; 4347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org last_units_second_time_ = current_time - fraction_time; 4447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org last_units_second_calc_ = total_units_ - fraction_units; 4547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 4647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 4747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org if (last_units_second_time_ == static_cast<uint32>(-1)) { 4847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org last_units_second_time_ = current_time; 4947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org last_units_second_calc_ = total_units_; 5047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org } 5147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 5247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org return units_second_; 5347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org} 5447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 5547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.orgvoid RateTracker::Update(size_t units) { 5647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org total_units_ += units; 5747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org} 5847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 5947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.orguint32 RateTracker::Time() const { 6047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org return rtc::Time(); 6147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org} 6247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 6347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org} // namespace rtc 64