Hi Sakari
On Wed, 28 Sep 2011, Sakari Ailus wrote:
> Guennadi Liakhovetski wrote:
> > A possibility to preallocate and initialise buffers of different sizes
> > in V4L2 is required for an efficient implementation of a snapshot
> > mode. This patch adds two new ioctl()s: VIDIOC_CREATE_BUFS and
> > VIDIOC_PREPARE_BUF and defines respective data structures.
> >
> > Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
>
> Hi Guennadi,
>
> Thanks for the patch and your tireless efforts on this!
>
> VIDIOC_PREPARE_BUF is actually _IOW (rather than _IOWR) in this patch. I
> guess it shouldn't be this way, or have I failed to understand
> something? :-)
hm, yeah, sure, thanks for catching.
Guennadi
>
> [clip]
>
> > @@ -2189,6 +2202,11 @@ struct v4l2_dbg_chip_ident {
> > #define VIDIOC_SUBSCRIBE_EVENT _IOW('V', 90, struct v4l2_event_subscription)
> > #define VIDIOC_UNSUBSCRIBE_EVENT _IOW('V', 91, struct v4l2_event_subscription)
> >
> > +/* Experimental, the below two ioctls may change over the next couple of kernel
> > + versions */
> > +#define VIDIOC_CREATE_BUFS _IOWR('V', 92, struct v4l2_create_buffers)
> > +#define VIDIOC_PREPARE_BUF _IOW('V', 93, struct v4l2_buffer)
> > +
> > /* Reminder: when adding new ioctls please add support for them to
> > drivers/media/video/v4l2-compat-ioctl32.c as well! */
> >
>
>
> --
> Sakari Ailus
> sakari.ailus@xxxxxx
>
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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