Lifetime of dai::ImgFrame

karl

I have an ImgFrame on the host, and I need to copy it over to my own Image type, is it possible to steal the memory owned by the ImgFrame to avoid copying (std::swap it)? Additionally, how is memory obtained when creating an image in host, does it come from some memory pool or is it newly created memory each time?

OskarSonc

Hey karl - there’s no public API to steal or std::swap the backing buffer out of a host dai::ImgFrame. You can only get a non‑owning view (getData() or getFrame(copy=false)), so to avoid copies you must keep the std::shared_ptr<dai::ImgFrame> alive for as long as your own Imageview uses that memory.

karl

Is a new block of memory being allocated on each new image or is there some preallocated memory that is used?

OskarSonc

On the host, a new ImgFrame with a size allocates fresh VectorMemory (a std::vector<uint8_t>) and resizes it. There’s no global preallocated pool in this path.