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/***************************************************************************
* Copyright (C) 2005 by Joris Guisson *
* [email protected] *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#include <qpair.h>
#include <qvaluelist.h>
#include <util/log.h>
#include <util/timer.h>
#include "speedestimater.h"
#include <util/functions.h>
namespace bt
{
class SpeedEstimater::SpeedEstimaterPriv
{
float rate;
QValueList<QPair<Uint32,TimeStamp> > dlrate;
public:
SpeedEstimaterPriv() : rate(0) {}
~SpeedEstimaterPriv() {}
void data(Uint32 bytes)
{
dlrate.append(qMakePair(bytes,GetCurrentTime()));
}
void update()
{
TimeStamp now = GetCurrentTime();
Uint32 bytes = 0,oldest = now;
QValueList<QPair<Uint32,TimeStamp> >::iterator i = dlrate.begin();
while (i != dlrate.end())
{
QPair<Uint32,TimeStamp> & p = *i;
if (now - p.second > 3000)
{
i = dlrate.erase(i);
}
else
{
if (p.second < oldest)
oldest = p.second;
bytes += p.first;
i++;
}
}
Uint32 d = 3000;
if (bytes == 0)
{
rate = 0;
}
else
{
// Out() << "bytes = " << bytes << " d = " << d << endl;
rate = (float) bytes / (d * 0.001f);
}
}
float getRate() const {return rate;}
};
SpeedEstimater::SpeedEstimater()
{
download_rate = 0;
down = new SpeedEstimaterPriv();
}
SpeedEstimater::~SpeedEstimater()
{
delete down;
}
void SpeedEstimater::onRead(Uint32 bytes)
{
down->data(bytes);
}
void SpeedEstimater::update()
{
down->update();
download_rate = down->getRate();
}
}
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