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/****************************************************************************
* *
* OpenNI 1.x Alpha *
* Copyright (C) 2011 PrimeSense Ltd. *
* *
* This file is part of OpenNI. *
* *
* OpenNI is free software: you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License as published *
* by the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* OpenNI 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 Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with OpenNI. If not, see <http://www.gnu.org/licenses/>. *
* *
****************************************************************************/
//---------------------------------------------------------------------------
// Includes
//---------------------------------------------------------------------------
#include "XnFPSCalculator.h"
#include <XnOS.h>
//---------------------------------------------------------------------------
// Types
//---------------------------------------------------------------------------
struct XnFPSDataImpl
{
/** An array of the time of each frame. */
XnUInt64* anTimes;
/** The size of the array. */
XnUInt32 nArraySize;
/** Index of the next place to write to. */
XnUInt32 nCurrIndex;
};
typedef struct XnFPSDataImpl XnFPSDataImpl;
//---------------------------------------------------------------------------
// Code
//---------------------------------------------------------------------------
XnStatus xnFPSInit(XnFPSData* pFPS, XnUInt32 nSamplesCount)
{
XN_VALIDATE_OUTPUT_PTR(pFPS);
// make sure xnOS is init
XnStatus nRetVal = xnOSInit();
if (nRetVal != XN_STATUS_OK && nRetVal != XN_STATUS_OS_ALREADY_INIT)
return nRetVal;
// Allocate struct
XN_VALIDATE_CALLOC(*pFPS, XnFPSDataImpl, 1);
XnFPSDataImpl* pData = *pFPS;
// Allocate array
XN_VALIDATE_ALIGNED_CALLOC(pData->anTimes, XnUInt64, nSamplesCount, XN_DEFAULT_MEM_ALIGN);
pData->nArraySize = nSamplesCount;
return XN_STATUS_OK;
}
XnStatus xnFPSMarkFrame(XnFPSData* pFPS, XnUInt64 nNow /* = 0 */)
{
XN_VALIDATE_INPUT_PTR(pFPS);
XnFPSDataImpl* pData = *pFPS;
if (nNow == 0)
xnOSGetHighResTimeStamp(&nNow);
// mark this time
pData->anTimes[pData->nCurrIndex] = nNow;
// increment array index
if (++pData->nCurrIndex == pData->nArraySize)
pData->nCurrIndex = 0;
return XN_STATUS_OK;
}
XnDouble xnFPSCalc(XnFPSData* pFPS, XnUInt32 nAverageOver /* = 3000 */, XnUInt64 nNow /* = 0 */)
{
XN_VALIDATE_INPUT_PTR(pFPS);
XnFPSDataImpl* pData = *pFPS;
if (nNow == 0)
xnOSGetHighResTimeStamp(&nNow);
XnUInt64 nSince = nNow - nAverageOver*1000;
// search for first index
XnUInt32 nFirst = pData->nCurrIndex;
XnUInt32 nLast = (pData->nCurrIndex + pData->nArraySize - 1) % pData->nArraySize;
// no valid samples
if (pData->anTimes[nLast] < nSince)
return 0.0;
// move first to the first sample BEFORE time 'since'.
while (nFirst != nLast && pData->anTimes[nFirst] < nSince)
nFirst = (nFirst + 1) % pData->nArraySize;
// calculate frames per second
XnUInt32 nFrames = ((nLast - nFirst + pData->nArraySize) % pData->nArraySize) + 1;
// if have no statistics...
if (nFrames <= 1)
return 0;
// number of frames received divided by amount of time passed
return (nFrames * 1e6 / (nNow - pData->anTimes[nFirst]));
}
XnStatus xnFPSFree(XnFPSData* pFPS)
{
XN_VALIDATE_INPUT_PTR(pFPS);
XnFPSDataImpl* pData = *pFPS;
if (pData != NULL)
{
if (pData->anTimes != NULL)
{
XN_ALIGNED_FREE_AND_NULL(pData->anTimes);
}
if (*pFPS != NULL)
{
XN_FREE_AND_NULL(*pFPS);
}
}
return XN_STATUS_OK;
}
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