I receive network streams on tx1 or tx2 ,and want to decode stream ,display data. but i dont want copy out data from GPU to CPU. can I send data to the CUDA display after decode directly ?
I saw samples that decode frame to CPU Memory ,or encode CPU Memory .Can the data go through the CPU?
About tegra_multimedia_api， I get the NvBuffer(basis of the v4l2_buffer structure) ，but it isn’t look like GPU memory. I want to know the tegra_multimedia_api that can support decode to GPU buffer, but not CPU buffer.
I read the sample tegra_multimedia_api/samples/02_video_dec_cuda in detail. and have three questions.
in the function read_decoder_input_nalu, it read the data from file stream and memcopy to the NvBuffer( HW-accessible memory), and “memcpy” is the function that to achieve the CPU memory to the HW-accessible memory?
char *buffer_ptr = (char *) buffer->planes.data; //NvBuffer * buffer
memcpy(buffer_ptr, stream_ptr, 4);
Create EGLImage from dmabuf fd, is just package the NvBuffer fd and no memory copy?
// Create EGLImage from dmabuf fd
ctx->egl_image = NvEGLImageFromFd(ctx->egl_display, buffer->planes.fd);
(3).how to convert eglimage to Nvbuffer?
I will use opengl to process the decoded Nvbuffer and then get new EGLImage ,convert eglimage to Nvbuffer, finally encode and record the Nvbuffer by video_enc_cuda .