On Thu 19 July 2012 13:33:56 Hadli, Manjunath wrote:
> Hi Laurent,
>
> On Wed, Jul 18, 2012 at 16:35:18, Laurent Pinchart wrote:
> > Hi Manjunath,
> >
> > On Tuesday 17 July 2012 12:22:42 Hadli, Manjunath wrote:
> > > On Tue, Jul 17, 2012 at 17:25:42, Laurent Pinchart wrote:
> > > > On Tuesday 17 July 2012 11:41:11 Hadli, Manjunath wrote:
> > > > > On Tue, Jul 17, 2012 at 16:26:24, Laurent Pinchart wrote:
> > > > > > On Friday 30 March 2012 10:09:13 Hadli, Manjunath wrote:
> > > > > > > add new enum entries for supporting the media-bus formats on
> > > > > > > dm365.
> > > > > > > These include some bayer and some non-bayer formats.
> > > > > > > V4L2_MBUS_FMT_YDYC8_1X16 and V4L2_MBUS_FMT_UV8_1X8 are used
> > > > > > > internal to the hardware by the resizer.
> > > > > > > V4L2_MBUS_FMT_SBGGR10_ALAW8_1X8 represents the bayer ALAW format
> > > > > > > that is supported by dm365 hardware.
> > > > > > >
> > > > > > > Signed-off-by: Manjunath Hadli <[email protected]>
> > > > > > > Cc: Laurent Pinchart <[email protected]>
> > > > > > > Cc: Sakari Ailus <[email protected]>
> > > > > > > Cc: Hans Verkuil <[email protected]>
> > > > > > > ---
> > > > > > >
> > > > > > > Documentation/DocBook/media/v4l/subdev-formats.xml | 171
> > > > > > > ++++++++++++
> > > > > > > include/linux/v4l2-mediabus.h | 10 +-
> > > > > > > 2 files changed, 179 insertions(+), 2 deletions(-)
> > > > > > >
> > > > > > > diff --git a/Documentation/DocBook/media/v4l/subdev-formats.xml
> > > > > > > b/Documentation/DocBook/media/v4l/subdev-formats.xml index
> > > > > > > 49c532e..48d92bb
> > > > > > > 100644
> > > > > > > --- a/Documentation/DocBook/media/v4l/subdev-formats.xml
> > > > > > > +++ b/Documentation/DocBook/media/v4l/subdev-formats.xml
> > > >
> > > > [snip]
> > > >
> > > > > > > @@ -965,6 +1036,56 @@
> > > > > > >
> > > > > > > <entry>y<subscript>1</subscript></entry>
> > > > > > > <entry>y<subscript>0</subscript></entry>
> > > > > > >
> > > > > > > </row>
> > > > > > >
> > > > > > > + <row id="V4L2-MBUS-FMT-UV8-1X8">
> > > > > >
> > > > > > That's a weird one. Just out of curiosity, what's the point of
> > > > > > transferring chroma information without luma ?
> > > > >
> > > > > DM365 supports this format.
> > > >
> > > > Right, but what is it used for ?
> > >
> > > Sorry about that. The Resizer in Dm365 can take only chroma and resize the
> > > buffer. It can also take luma of course. In general it can take UV8, Y8
> > > and
> > > also UYVY.
> >
> > So UV8 is used to resize an NV buffer in two passes (first Y8 then UV8) ?
> >
> No. The resizer can take has a capability to resize UV8 alone. Apart from
> this I don't see any use case for UV8.
>
> (Hans, Sakari, Guennadi, any opinion on exposing UV8 to user?)
I have no problem with that. As far as I can tell they should be useful for
conversions between 4:2:0, 4:2:2 and 4:4:4 formats where you just want to resize
the chroma plane.
Regards,
Hans
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