Re: [PATCHv2] New V4L2 ioctls for OMAP class of Devices

[Trent Piepho <xyzzy@xxxxxxxxxxxxx>]

On Thu, 29 Jan 2009, Hans Verkuil wrote:
> On Thursday 29 January 2009 08:44:20 DongSoo Kim wrote:
> > Hello.
> >
> > > +#define VIDIOC_S_COLOR_SPACE_CONV      _IOW('V', 83, struct
> > > v4l2_color_space_conversion) +#define VIDIOC_G_COLOR_SPACE_CONV
> > > _IOR('V', 84, struct v4l2_color_space_conversion)
> >
> > Do you mind if I ask a question about those ioctls?
> > Because as far as I understand, we can use VIDIOC_S_FMT ioctl to convert
> > colorspaces. Setting through colorspace member in v4l2_pix_format, we
> > could change output colorspace.
>
> Colorspace is read-only, you cannot set it. It just gives you the colorspace
> that the hardware uses by default.

Is there a reason it must be read-only?

> If you want to fully control the colorspace, then you need these ioctls.

I don't know about "fully".  I don't see anything about gamma correction.
Since there is no documentation, it's also not clear if it can describe the
full range luma the bt848 and cx88 can produce.

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