allocator to be used for this memory
dmabuf file descriptor
memory size
extra #GstFdMemoryFlags
a GstMemory based on allocator.
When the buffer will be released the allocator will close the fd unless the GST_FD_MEMORY_FLAG_DONT_CLOSE flag is specified. The memory is only mmapped on gst_buffer_mmap() request.
Return a gst.memory.Memory that wraps a dmabuf file descriptor.