Thread: download/upload speed calculations

Hi,

Im trying to calculate download/upload speed based on total data downloaded/uploaded.

The problem with my current method is that it sometimes displays a really large value. Heres the code im using, its called after every send/recv, xBandwidthInfo is a global struct used to keep track of the totals/rates.

Code:

void CalculateRates()
{
	xBandwidthInfo *m_pInfo = (xBandwidthInfo *)lpvMem;

	int nTimeDelta = timeGetTime() - m_pInfo->nLastTime;

	if (nTimeDelta == 0)
		nTimeDelta = 1;

	if (abs(nTimeDelta) >= 1000) // reset every second
	{
		m_pInfo->nLastDownload = m_pInfo->nTotalDownload;
		m_pInfo->nLastUpload = m_pInfo->nTotalUpload;
		m_pInfo->nLastTime = timeGetTime();
	}

	uint nCurrentDownload = m_pInfo->nTotalDownload - m_pInfo->nLastDownload;
	uint nCurrentUpload = m_pInfo->nTotalUpload - m_pInfo->nLastUpload;

	float fTime = 1000.0f / nTimeDelta;
	fTime = abs(fTime);

	m_pInfo->fDownloadRate = (float)nCurrentDownload * fTime;
	m_pInfo->fUploadRate = (float)nCurrentUpload * fTime;
}