Hi Laurent,
On 12/17/2015 09:40 AM, Laurent Pinchart wrote:
> Let userspace specify a request ID when getting or setting formats. The
> support is limited to the multi-planar API at the moment, extending it
> to the single-planar API is possible if needed.
>
> From a userspace point of view the API change is also minimized and
> doesn't require any new ioctl.
>
> Signed-off-by: Laurent Pinchart <[email protected]>
> ---
> include/uapi/linux/videodev2.h | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 5af1d2d87558..5b2a8bc80eb2 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -1973,6 +1973,7 @@ struct v4l2_plane_pix_format {
> * @ycbcr_enc: enum v4l2_ycbcr_encoding, Y'CbCr encoding
> * @quantization: enum v4l2_quantization, colorspace quantization
> * @xfer_func: enum v4l2_xfer_func, colorspace transfer
> function
> + * @request: request ID
> */
> struct v4l2_pix_format_mplane {
> __u32 width;
> @@ -1987,7 +1988,8 @@ struct v4l2_pix_format_mplane {
> __u8 ycbcr_enc;
> __u8 quantization;
> __u8 xfer_func;
> - __u8 reserved[7];
> + __u8 reserved[3];
> + __u32 request;
I think I mentioned this before: I feel uncomfortable using 4 bytes of the
reserved
fields when the request ID is limited to 16 bits anyway.
I would prefer a __u16 here. Also put the request field *before* the reserved
array, not after.
Regards,
Hans
> } __attribute__ ((packed));
>
> /**
>
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