Hi Hans,
On Sunday 26 September 2010 19:44:38 Hans Verkuil wrote:
> On Sunday, September 26, 2010 19:34:49 Laurent Pinchart wrote:
> > On Sunday 26 September 2010 19:29:53 Hans Verkuil wrote:
> > > On Sunday, September 26, 2010 18:13:25 Laurent Pinchart wrote:
> > > > Adding new pixel codes at the end of the enumeration will soon create
> > > > a mess, so sort the pixel codes by type and then sort them
> > > > alphabetically.
> > > >
> > > > As the codes are part of the kernel ABI their value can't change when
> > > > a new code is inserted in the enumeration, so they are given an
> > > > explicit numerical value. When inserting a new pixel code developers
> > > > must use and update the V4L2_MBUS_FMT_LAST value.
> > > >
> > > > Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> > > > ---
> > > >
> > > > include/linux/v4l2-mediabus.h | 54
> > > > ++++++++++++++++++++++++---------------- 1 files changed, 32
> > > > insertions(+), 22 deletions(-)
> > > >
> > > > diff --git a/include/linux/v4l2-mediabus.h
> > > > b/include/linux/v4l2-mediabus.h index 127512a..bc637a5 100644
> > > > --- a/include/linux/v4l2-mediabus.h
> > > > +++ b/include/linux/v4l2-mediabus.h
> > > > @@ -24,31 +24,41 @@
> > > >
> > > > * transferred first, "BE" means that the most significant bits are
> > > > transferred * first, and "PADHI" and "PADLO" define which bits -
> > > > low or high, in the * incomplete high byte, are filled with
> > > > padding bits.
> > > >
> > > > + *
> > > > + * The pixel codes are grouped by types and (mostly) sorted
> > > > alphabetically. As + * their value can't change when a new pixel code
> > > > is inserted in the + * enumeration, they are explicitly given a
> > > > numerical value. When inserting a + * new pixel code use and update
> > > > the V4L2_MBUS_FMT_LAST value.
> > > >
> > > > */
> > > >
> > > > enum v4l2_mbus_pixelcode {
> > > >
> > > > V4L2_MBUS_FMT_FIXED = 1,
> > > >
> > > > - V4L2_MBUS_FMT_YUYV8_2X8,
> > > > - V4L2_MBUS_FMT_YVYU8_2X8,
> > > > - V4L2_MBUS_FMT_UYVY8_2X8,
> > > > - V4L2_MBUS_FMT_VYUY8_2X8,
> > > > - V4L2_MBUS_FMT_RGB555_2X8_PADHI_LE,
> > > > - V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE,
> > > > - V4L2_MBUS_FMT_RGB565_2X8_LE,
> > > > - V4L2_MBUS_FMT_RGB565_2X8_BE,
> > > > - V4L2_MBUS_FMT_SBGGR8_1X8,
> > > > - V4L2_MBUS_FMT_SBGGR10_1X10,
> > > > - V4L2_MBUS_FMT_GREY8_1X8,
> > > > - V4L2_MBUS_FMT_Y10_1X10,
> > > > - V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_LE,
> > > > - V4L2_MBUS_FMT_SBGGR10_2X8_PADLO_LE,
> > > > - V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_BE,
> > > > - V4L2_MBUS_FMT_SBGGR10_2X8_PADLO_BE,
> > > > - V4L2_MBUS_FMT_SGRBG8_1X8,
> > > > - V4L2_MBUS_FMT_SBGGR12_1X12,
> > > > - V4L2_MBUS_FMT_YUYV8_1_5X8,
> > > > - V4L2_MBUS_FMT_YVYU8_1_5X8,
> > > > - V4L2_MBUS_FMT_UYVY8_1_5X8,
> > > > - V4L2_MBUS_FMT_VYUY8_1_5X8,
> > > > + /* RGB */
> > > > + V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE = 7,
> > > > + V4L2_MBUS_FMT_RGB555_2X8_PADHI_LE = 6,
> > > > + V4L2_MBUS_FMT_RGB565_2X8_BE = 9,
> > > > + V4L2_MBUS_FMT_RGB565_2X8_LE = 8,
> > > > + /* YUV (including grey) */
> > > > + V4L2_MBUS_FMT_GREY8_1X8 = 12,
> > > > + V4L2_MBUS_FMT_Y10_1X10 = 13,
> > > > + V4L2_MBUS_FMT_YUYV8_1_5X8 = 20,
> > > > + V4L2_MBUS_FMT_YVYU8_1_5X8 = 21,
> > > > + V4L2_MBUS_FMT_UYVY8_1_5X8 = 22,
> > > > + V4L2_MBUS_FMT_VYUY8_1_5X8 = 23,
> > > > + V4L2_MBUS_FMT_YUYV8_2X8 = 2,
> > > > + V4L2_MBUS_FMT_UYVY8_2X8 = 4,
> > > > + V4L2_MBUS_FMT_YVYU8_2X8 = 3,
> > > > + V4L2_MBUS_FMT_VYUY8_2X8 = 5,
> > > > + /* Bayer */
> > > > + V4L2_MBUS_FMT_SBGGR8_1X8 = 10,
> > > > + V4L2_MBUS_FMT_SBGGR10_1X10 = 11,
> > > > + V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_BE = 16,
> > > > + V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_LE = 14,
> > > > + V4L2_MBUS_FMT_SBGGR10_2X8_PADLO_BE = 17,
> > > > + V4L2_MBUS_FMT_SBGGR10_2X8_PADLO_LE = 15,
> > > > + V4L2_MBUS_FMT_SBGGR12_1X12 = 19,
> > > > + V4L2_MBUS_FMT_SGRBG8_1X8 = 18,
> > >
> > > Why on earth would you want to keep the original values? It was
> > > internal only, so no need to stick to the old values.
> >
> > Good point :-)
> >
> > > Just let RGB start at 1000, YUV at 2000 and Bayer at 3000 or something
> > > like that.
> > >
> > > > + /* Last - Update this when adding a new pixel code */
> > > > + V4L2_MBUS_FMT_LAST = 24,
> > >
> > > Why would you need this?
> >
> > We've discussed this in the past. Keeping holes won't help, as we will
> > have to insert formats in places where we won't have holes sooner or
> > later. We agreed that it was better to keep the list organized by
> > format, as that's easier to read. V4L2_MBUS_FMT_LAST is thus a shortcut
> > to avoid searching for the highest format when adding a new one. As the
> > constant itself isn't really needed, we can keep the highest allocated
> > format code in a comment instead.
>
> I would definitely make it a comment.
OK.
> Actually, a counter should be kept per section. It might actually be useful
> in the future if you can do something like:
>
> if ((mbus_fmt & MBUS_FMT_TYPE_MASK) == MBUS_FMT_TYPE_YUV)
I'm not sure I like the concept of sections. How do you define what a section
is ?
--
Regards,
Laurent Pinchart
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