Buffer instances reference memory, which is modelled internally by a BufferMemory instance. Store a pointer to the BufferMemory in the Buffer class, and populate it when the buffer is queued to the camera through a request. This is useful for applications to access the buffer memory in the buffer or request completion handler. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>