What exactly does cuGraphicsResourceGetMappedEglFrame do?

Autonomous Machines Jetson & Embedded Systems Jetson TX1
1

The Argus cudaHistogram sample shows a way to move images quickly from the camera into the GPU, but it only can act on the luminance channel.

From what I can tell, the cuGraphicsResourceGetMappedEglFrame gives you a pointer to a something that wants to be turned into to a 2d surface. Because this sample code works

CUDA_RESOURCE_DESC cudaResourceDesc;
        memset(&cudaResourceDesc, 0, sizeof(cudaResourceDesc));
        cudaResourceDesc.resType = CU_RESOURCE_TYPE_ARRAY;
        cudaResourceDesc.res.array.hArray = cudaEGLFrame.frame.pArray[0];
        CUsurfObject cudaSurfObj = 0;
        cuResult = cuSurfObjectCreate(&cudaSurfObj, &cudaResourceDesc);

But change that pArray[0] to pArray[1] to try to get at the color information and it stops working.

How can one convert that CUeglFrame into a straightforward array of integers so that you can do some calculations on it?

2

Hi,

Thanks for your question.

Could you check backend sample in MMAPI first?
This sample can give you some hint about cuGraphicsResourceGetMappedEglFrame().

Located at:
‘/home/ubuntu/tegra_multimedia_api/samples/backend/v4l2_backend_main.cpp’