On Tue, 5 Apr 2011, Hans Verkuil wrote:
> On Tuesday, April 05, 2011 14:21:03 Laurent Pinchart wrote:
> > On Friday 01 April 2011 10:13:02 Guennadi Liakhovetski wrote:
[snip]
> > > /*
> > > * I O C T L C O D E S F O R V I D E O D E V I C E S
> > > *
> > > @@ -1937,6 +1957,10 @@ 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)
> > >
> > > +#define VIDIOC_CREATE_BUFS _IOWR('V', 92, struct v4l2_create_buffers)
> > > +#define VIDIOC_DESTROY_BUFS _IOWR('V', 93, struct v4l2_buffer_span)
> > > +#define VIDIOC_SUBMIT_BUF _IOW('V', 94, int)
> > > +
> >
> > In case we later need to pass other information (such as flags) to
> > VIDIOC_SUBMIT_BUF, you should use a structure instead of an int.
>
> I would just pass struct v4l2_buffer to this ioctl, just like QBUF/DQBUF do.
Why??? You do not need all that extra information. Well, we could, of
course, make a struct with reserved fields... but it seems nice to me to
have the clarity here - this ioctl() _only_ gives buffer ownership to the
kernel. No more configuration...
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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