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/*
*
* $Id: k3bthroughputestimator.cpp 619556 2007-01-03 17:38:12Z trueg $
* Copyright (C) 2003 Sebastian Trueg <trueg@k3b.org>
*
* This file is part of the K3b project.
* Copyright (C) 1998-2007 Sebastian Trueg <trueg@k3b.org>
*
* 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.
* See the file "COPYING" for the exact licensing terms.
*/
#include "k3bthroughputestimator.h"
#include <qdatetime.h>
#include <kdebug.h>
class K3bThroughputEstimator::Private
{
public:
Private()
: started(false) {
}
QTime firstDataTime;
unsigned long firstData;
QTime lastDataTime;
unsigned long lastData;
int lastThroughput;
bool started;
};
K3bThroughputEstimator::K3bThroughputEstimator( QObject* parent, const char* name )
: QObject( parent, name )
{
d = new Private();
}
K3bThroughputEstimator::~K3bThroughputEstimator()
{
delete d;
}
int K3bThroughputEstimator::average() const
{
int msecs = d->firstDataTime.msecsTo( d->lastDataTime );
if( msecs > 0 )
return (int)( 1000.0*(double)(d->lastData - d->firstData)/(double)msecs);
else
return 0;
}
void K3bThroughputEstimator::reset()
{
d->started = false;
}
void K3bThroughputEstimator::dataWritten( unsigned long data )
{
if( !d->started ) {
d->started = true;
d->firstData = d->lastData = data;
d->firstDataTime.start();
d->lastDataTime.start();
d->lastThroughput = 0;
}
else if( data > d->lastData ) {
unsigned long diff = data - d->lastData;
int msecs = d->lastDataTime.elapsed();
//if( msecs > 0 ) {
// down the update sequence a little bit
if( msecs > 500 ) {
d->lastData = data;
d->lastDataTime.start();
int t = (int)(1000.0*(double)diff/(double)msecs);
if( t != d->lastThroughput ) {
d->lastThroughput = t;
emit throughput( t );
}
}
}
}
#include "k3bthroughputestimator.moc"
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