topic Hello, thank you for your in Intel® Integrated Performance Primitives

AccessViolation exception in using ippiHistogram_32f_C1R

Emami__Sayed_Masih — Wed, 03 Jul 2019 13:39:52 GMT

Hi,

We are getting AccessViolationException in a call to ippiHistogram_32f_C1R every now and then, and it leads to a crash in our application.

We're using Ipp 2019 Update 1, and here is the code (the line in bold leads to AccessViolationException).

In HandleReturnValue, we check if the return value is different than 0, and if so we throw the proper exception.
img.Step is generated by a call to ippiMalloc_32f_C1.

Could you point us to where the error might be?

public static uint[] Histogram(VMImage img, int band, float[] levels)
{
   short ippStatus = 0;
   int[] nLevels = { levels.Length };
   int sizeHistObj, sizeBuffer;
   IppiHistogramSpec* histSpec = null;
   byte* histBuffer = null;
   uint[] hist = new uint[levels.Length - 1];

   fixed (uint* pHist = &hist[0])
   {
       fixed (float* pLevels0 = &levels[0])
       {
           float*[] pLevels = { pLevels0 };
           fixed (float** ppLevels = &pLevels[0])
           {
               // Get sizes for spec and buffer
               ippStatus = ippiHistogramGetBufferSize(IppDataType.ipp32f, img.GetRoiSize(), nLevels, 1/*nChan*/, 0/*user step*/, &sizeHistObj, &sizeBuffer);
               HandleReturnValue(ippStatus);
               // Allocation of buffers
               histSpec = (IppiHistogramSpec*)ippsMalloc_8u(sizeHistObj);
               histBuffer = (byte*)ippsMalloc_8u(sizeBuffer);
               // Initialize spec
               ippStatus = ippiHistogramInit(IppDataType.ipp32f, ppLevels, nLevels, 1/*nChan*/, histSpec);
               HandleReturnValue(ippStatus);
               // Calculate histogram
               ippStatus = ippiHistogram_32f_C1R((float*)img.GetRoiPointer(band), img.Step, img.GetRoiSize(), pHist, histSpec, histBuffer);
               HandleReturnValue(ippStatus);
           }
       }
   }

   // CleanUp
   if (histSpec != null)
   {
       ippsFree(histSpec);
   }
   if (histBuffer != null)
   {
       ippsFree(histBuffer);
   }

return hist;
}

here is an unknown issue with

Gennady_F_Intel — Thu, 04 Jul 2019 04:29:11 GMT

here is an unknown issue with IPP v.2019. Do you see if the problem happens with some specific input images or it happens anytime?

at the very first glance, everything looks as expected. We need to have a comprehensive example to build and run on our side.

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Hello, thank you for your

Ilya_O_Intel — Mon, 26 Aug 2019 11:54:14 GMT

Hello, thank you for your issue. Could you please send more comprehensive code or explain in which cases you get this error? In this case I don't get same issue as you:

int main() {
	IppStatus status = ippStsNoErr;

	const int WIDTH   = 8;
	const int HEIGHT  = 8;
	const int nLevels = 5;

	int step;
	int specSize;
	int sizeBuffer;

	Ipp32f levels[nLevels] = { 0, 2, 4, 6, 13 };
	Ipp32f* pLevels        = &levels[0];

	IppiHistogramSpec* pSpec;

	Ipp8u*             pBuffer;

	Ipp32f*pSrc = ippiMalloc_32f_C1(WIDTH, HEIGHT, &step);
	Ipp32u pHist[nLevels - 1];

	IppiSize roiSize = { WIDTH, HEIGHT };

	status = ippiHistogramGetBufferSize(IppDataType::ipp32f, roiSize, &nLevels, 1, 0, &specSize, &sizeBuffer);
	print_status("ippiHistogramGetBufferSize", status);

	pSpec   = (IppiHistogramSpec*)ippsMalloc_8u(specSize);
	pBuffer = (byte*)ippsMalloc_8u(sizeBuffer);

	status = ippiHistogramInit(IppDataType::ipp32f, (const Ipp32f**)&pLevels, (int*)&nLevels, 1, pSpec);
	print_status("ippiHistogramInit", status);

	status = ippiHistogramGetLevels(pSpec, &pLevels);
	print_status("ippiHistogramGetLevels", status);

	status = ippiHistogram_32f_C1R(pSrc, step, roiSize, pHist, pSpec, pBuffer);
	print_status("ippiHistogram_32f_C1R", status);

	return 0;
}