On Wed, Mar 22, 2023 at 10:50:52AM -0400, Nicolas Dufresne wrote: > Hi Laurent, > > Le lundi 20 mars 2023 à 01:33 +0200, Laurent Pinchart a écrit : > > > The typical usage is that applications allocate N buffers with the > > > VIDIOC_REQBUFS ioctl, and in most cases that's all they use. > > > > Note that once we get DELETE_BUF (or DELETE_BUFS) support I'd like to > > encourage applications to use the new API, and deprecate REQBUFS > > (dropping it isn't on my radar, as it would take forever before no > > userspace uses it anymore). > > I was wondering if you can extend on this. I'm worried the count semantic might > prevent emulating it over create_bufs() ops, but if that works, did you meant to > emulate it so driver no longer have to implement reqbufs() if they have > create_bufs() ? For drivers it should be fairly simply, as the reqbufs and create_bufs ioctl handlers should just point to the corresponding videobuf2 helpers. What I meant is that I'd like to encourage userspace to use the VIDIOC_CREATE_BUFS ioctl instead of VIDIOC_REQBUFS. -- Regards, Laurent Pinchart
