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 <[email protected]>
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? :-)
[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
[email protected]
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