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To convert a VPIImage in VPIIMAGEFORMATRGB8 to a format that can be used with the hardware JPEG encoder on the Jetson AGX Orin, which requires a dmabuf file descriptor, you have a few options. Since you’ve already successfully converted the image using libyuv’s RGB24ToI420 function on the CPU, I’ll focus on exploring GPU-accelerated conversion methods that can provide a dmabuf file descriptor.
Option 1: Using NPP (NVIDIA Performance Primitives)
You’ve already tried using NPP’s nppiRGBToNV12_8u_C3P2R function, which successfully converted the image to NV12 format. However, you encountered issues with the memory type, as NPP requires a specific memory layout that isn’t compatible with NVBUFMEMSURFACEARRAY or NVBUFMEMHANDLE.
To overcome this limitation, you could consider using NPP’s nppiRGBToNV12_8u_C3P2R function with a CUDA memory allocation, and then use the cudaMalloc and cudaMemcpy functions to transfer the data to a NvBufSurface with the desired memory type. This approach would require additional memory copies, which might impact performance.
Option 2: Using VPI (Vision Programming Interface)
Since you’re already using VPI, you can explore the VPIImage conversion functions provided by the VPI library. Specifically, you can use the vpiImageConvert function to convert the VPIImage in VPIIMAGEFORMATRGB8 to a VPIImage in VPIIMAGEFORMATYUV420 or VPIIMAGEFORMATNV12.
VPI provides a VPIImage conversion function that can convert between different formats, including RGB8 to YUV420 or NV12. This function is optimized for the Jetson platform and can take advantage of the GPU acceleration.
To use this function, you’ll need to create a VPIImage object with the desired output format and then call the vpiImageConvert function to perform the conversion. The resulting VPIImage object will contain the converted image data in the desired format.
Option 3: Using NvBufSurfaceTransform
As you’ve already tried, NvBufSurfaceTransform can be used to convert between different formats, but it doesn’t support conversion between CUDA and NVBUFMEMSURFACEARRAY or NVBUFMEMHANDLE memory types.
However, you can use NvBufSurfaceTransform to convert the NvBufSurface with NVBUFMEMSURFACEARRAY memory type to a NvBufSurface with NVBUFMEMHANDLE memory type, and then use the NvBufSurfaceMap function to get a dmabuf file descriptor for the converted surface.
In summary, the preferred way to transform or wrap a VPIImage in VPIIMAGEFORMATRGB8 to get a dmabuf file descriptor for the Nvjpeg Encoder is to use the VPI library’s vpiImageConvert function, which provides a GPU-accelerated conversion to the desired format. If you prefer to use NPP, you’ll need to perform additional memory copies to transfer the data to a NvBufSurface with the desired memory type.
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