Hi Laurent,
Thanks for the patch.
On Fri, Aug 19, 2011 at 08:14:20AM +0200, Laurent Pinchart wrote:
> NV24 and NV42 are planar YCbCr 4:4:4 and YCrCb 4:4:4 formats with a
> luma plane followed by an interleaved chroma plane.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> ---
> Documentation/DocBook/media/v4l/pixfmt-nv24.xml | 128 +++++++++++++++++++++++
> Documentation/DocBook/media/v4l/pixfmt.xml | 1 +
> include/linux/videodev2.h | 2 +
> 3 files changed, 131 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/DocBook/media/v4l/pixfmt-nv24.xml
>
> This format will be used by an fbdev driver. I'm already posting the patch for
> for review and will send a pull request later.
>
> diff --git a/Documentation/DocBook/media/v4l/pixfmt-nv24.xml b/Documentation/DocBook/media/v4l/pixfmt-nv24.xml
> new file mode 100644
> index 0000000..e77301d
> --- /dev/null
> +++ b/Documentation/DocBook/media/v4l/pixfmt-nv24.xml
> @@ -0,0 +1,128 @@
> + <refentry>
> + <refmeta>
> + <refentrytitle>V4L2_PIX_FMT_NV24 ('NV24'), V4L2_PIX_FMT_NV42 ('NV42')</refentrytitle>
> + &manvol;
> + </refmeta>
> + <refnamediv>
> + <refname id="V4L2-PIX-FMT-NV24"><constant>V4L2_PIX_FMT_NV24</constant></refname>
> + <refname id="V4L2-PIX-FMT-NV42"><constant>V4L2_PIX_FMT_NV42</constant></refname>
> + <refpurpose>Formats with full horizontal and vertical
> +chroma resolutions, also known as YUV 4:4:4. One luminance and one
> +chrominance plane with alternating chroma samples as opposed to
> +<constant>V4L2_PIX_FMT_YVU420</constant></refpurpose>
> + </refnamediv>
> + <refsect1>
> + <title>Description</title>
> +
> + <para>These are two-plane versions of the YUV 4:4:4 format.
> +The three components are separated into two sub-images or planes. The
> +Y plane is first. The Y plane has one byte per pixel. For
Are all 8 bits being used per sample, or is there padding?
> +<constant>V4L2_PIX_FMT_NV24</constant>, a combined CbCr plane
> +immediately follows the Y plane in memory. The CbCr plane is the same
> +width and height, in pixels, as the Y plane (and of the image).
> +Each line contains one CbCr pair per pixel.
How may bits / bytes per Cb / Cr sample? Perhaps you could mention this once
somewhere if all have the same.
> +<constant>V4L2_PIX_FMT_NV42</constant> is the same except the Cb and
> +Cr bytes are swapped, the CrCb plane starts with a Cr byte.</para>
> + <para>If the Y plane has pad bytes after each row, then the
> +CbCr plane has twice as many pad bytes after its rows.</para>
[clip]
Cheers,
--
Sakari Ailus
sakari.ailus@xxxxxx
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