how to input GPU device data directly to encode data?

Autonomous Machines Jetson & Embedded Systems Jetson TX2
1

I have a question in 01_video_encode of tegra_multimedia_api,the application YUV reads input buffers from a file, performs H.264 or H.265 video encoding.But now i want to input GPU device data directly to encode.
I use cudaMemcpy to copy device data to planes,but it fails.
char *buffer_ptr = (char *)buffer.planes[0].data;
cudaError_t cudaStatus = cudaMemcpy(buffer_ptr, imgbuffer, data_size, cudaMemcpyDeviceToDevice);

I try to modify this:
ctx->output_memory_type = V4L2_MEMORY_MMAP;//V4L2_MEMORY_DMABUF;
It also fails.Now i am confused.
Please tell me how to solve this problem.
Thank you!

2

The imgbuffer is allocated in GPU using cudaMalloc function as follows:

unsigned char tImg;
cudaMalloc((void*)&tImg, data_size);

I know the NvBuffer is allocated in HW buffer,
what is the difference between the HW buffer and Gpu buffer?
How to copy Gpu device buffer to Nvbuffer?

3

Hi,
You may refer to below lines in 03_video_cuda_enc:

ctx.eglimg = NvEGLImageFromFd(ctx.eglDisplay, buffer->planes[0].fd);
HandleEGLImage(&ctx.eglimg);
NvDestroyEGLImage(ctx.eglDisplay, ctx.eglimg);

It demonstrates how to get CUdeviceptr in HandleEGLImage(). You can perform cudaMemcpy() with the pointer.