DeepStream库函数详解：NvBufSurfaceMapEglImage

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该函数`intNvBufSurfaceMapEglImage()`从NvBufSurface缓冲区创建EGLImage，支持NVBUF_MEM_SURFACE_ARRAY类型的内存。创建的EGLImage的地址存储在NvBufSurface结构的子结构中，用于后续CUDA操作。参数包括指向NvBufSurface的指针和要映射的缓冲区索引。成功返回0，否则返回-1。

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int NvBufSurfaceMapEglImage(
	NvBufSurface * 	surf,
	int 			index )

Creates an EGLImage from the memory of one or more NvBufSurface buffers.

Only memory type NVBUF_MEM_SURFACE_ARRAY is supported.

This function returns the created EGLImage by storing its address at surf->surfaceList->mappedAddr->eglImage. (surf is a pointer to an NvBufSurface. surfaceList is a pointer to an NvBufSurfaceParams. mappedAddr is a pointer to an NvBufSurfaceMappedAddr.eglImage is declared as a pointer to void, and holds an EGLImageKHR.)

You can use this function in scenarios where a CUDA operation on Jetson hardware memory (identified by NVBUF_MEM_SURFACE_ARRAY) is required. The EGLImageKHR struct provided by this function can then be registered with CUDA for further CUDA operations.

Parameters

[in,out] surf
A pointer to an NvBufSurface structure. The function stores a pointer to the created EGLImage in a descendant of this structure; see the notes above.
[in] index
Index of a buffer in the batch. -1 specifies all buffers in the batch.
Returns
0 for success, or -1 otherwise.

https://docs.nvidia.com/metropolis/deepstream/4.0/dev-guide

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