28e2075280
trunk/talk git-svn-id: http://webrtc.googlecode.com/svn/trunk@4318 4adac7df-926f-26a2-2b94-8c16560cd09d
81 lines
3.1 KiB
C++
81 lines
3.1 KiB
C++
/*
|
|
* libjingle
|
|
* Copyright 2004--2010, Google Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
|
|
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
|
|
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
|
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
|
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "talk/base/ratetracker.h"
|
|
#include "talk/base/timeutils.h"
|
|
|
|
namespace talk_base {
|
|
|
|
RateTracker::RateTracker()
|
|
: total_units_(0), units_second_(0),
|
|
last_units_second_time_(static_cast<uint32>(-1)),
|
|
last_units_second_calc_(0) {
|
|
}
|
|
|
|
size_t RateTracker::total_units() const {
|
|
return total_units_;
|
|
}
|
|
|
|
size_t RateTracker::units_second() {
|
|
// Snapshot units / second calculator. Determine how many seconds have
|
|
// elapsed since our last reference point. If over 1 second, establish
|
|
// a new reference point that is an integer number of seconds since the
|
|
// last one, and compute the units over that interval.
|
|
uint32 current_time = Time();
|
|
if (last_units_second_time_ != static_cast<uint32>(-1)) {
|
|
int delta = talk_base::TimeDiff(current_time, last_units_second_time_);
|
|
if (delta >= 1000) {
|
|
int fraction_time = delta % 1000;
|
|
int seconds = delta / 1000;
|
|
int fraction_units =
|
|
static_cast<int>(total_units_ - last_units_second_calc_) *
|
|
fraction_time / delta;
|
|
// Compute "units received during the interval" / "seconds in interval"
|
|
units_second_ =
|
|
(total_units_ - last_units_second_calc_ - fraction_units) / seconds;
|
|
last_units_second_time_ = current_time - fraction_time;
|
|
last_units_second_calc_ = total_units_ - fraction_units;
|
|
}
|
|
}
|
|
if (last_units_second_time_ == static_cast<uint32>(-1)) {
|
|
last_units_second_time_ = current_time;
|
|
last_units_second_calc_ = total_units_;
|
|
}
|
|
|
|
return units_second_;
|
|
}
|
|
|
|
void RateTracker::Update(size_t units) {
|
|
total_units_ += units;
|
|
}
|
|
|
|
uint32 RateTracker::Time() const {
|
|
return talk_base::Time();
|
|
}
|
|
|
|
} // namespace talk_base
|