Em 31-08-2011 08:18, Laurent Pinchart escreveu:
> 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>
Acked-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
> ---
> Documentation/DocBook/media/v4l/pixfmt-nv24.xml | 129 +++++++++++++++++++++++
> Documentation/DocBook/media/v4l/pixfmt.xml | 1 +
> include/linux/videodev2.h | 2 +
> 3 files changed, 132 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/DocBook/media/v4l/pixfmt-nv24.xml
>
> diff --git a/Documentation/DocBook/media/v4l/pixfmt-nv24.xml b/Documentation/DocBook/media/v4l/pixfmt-nv24.xml
> new file mode 100644
> index 0000000..939c803
> --- /dev/null
> +++ b/Documentation/DocBook/media/v4l/pixfmt-nv24.xml
> @@ -0,0 +1,129 @@
> + <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, with each Y sample stored in one byte per pixel. For
> + <constant>V4L2_PIX_FMT_NV24</constant>, a combined CbCr plane
> + immediately follows the Y plane in memory. The CbCr plane has the same
> + width and height, in pixels, as the Y plane (and the image). Each line
> + contains one CbCr pair per pixel, with each Cb and Cr sample stored in
> + one byte. <constant>V4L2_PIX_FMT_NV42</constant> is the same except that
> + the Cb and Cr samples are swapped, the CrCb plane starts with a Cr
> + sample.</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>
> +
> + <example>
> + <title><constant>V4L2_PIX_FMT_NV24</constant> 4 × 4
> +pixel image</title>
> +
> + <formalpara>
> + <title>Byte Order.</title>
> + <para>Each cell is one byte.
> + <informaltable frame="none">
> + <tgroup cols="9" align="center">
> + <colspec align="left" colwidth="2*" />
> + <tbody valign="top">
> + <row>
> + <entry>start + 0:</entry>
> + <entry>Y'<subscript>00</subscript></entry>
> + <entry>Y'<subscript>01</subscript></entry>
> + <entry>Y'<subscript>02</subscript></entry>
> + <entry>Y'<subscript>03</subscript></entry>
> + </row>
> + <row>
> + <entry>start + 4:</entry>
> + <entry>Y'<subscript>10</subscript></entry>
> + <entry>Y'<subscript>11</subscript></entry>
> + <entry>Y'<subscript>12</subscript></entry>
> + <entry>Y'<subscript>13</subscript></entry>
> + </row>
> + <row>
> + <entry>start + 8:</entry>
> + <entry>Y'<subscript>20</subscript></entry>
> + <entry>Y'<subscript>21</subscript></entry>
> + <entry>Y'<subscript>22</subscript></entry>
> + <entry>Y'<subscript>23</subscript></entry>
> + </row>
> + <row>
> + <entry>start + 12:</entry>
> + <entry>Y'<subscript>30</subscript></entry>
> + <entry>Y'<subscript>31</subscript></entry>
> + <entry>Y'<subscript>32</subscript></entry>
> + <entry>Y'<subscript>33</subscript></entry>
> + </row>
> + <row>
> + <entry>start + 16:</entry>
> + <entry>Cb<subscript>00</subscript></entry>
> + <entry>Cr<subscript>00</subscript></entry>
> + <entry>Cb<subscript>01</subscript></entry>
> + <entry>Cr<subscript>01</subscript></entry>
> + <entry>Cb<subscript>02</subscript></entry>
> + <entry>Cr<subscript>02</subscript></entry>
> + <entry>Cb<subscript>03</subscript></entry>
> + <entry>Cr<subscript>03</subscript></entry>
> + </row>
> + <row>
> + <entry>start + 24:</entry>
> + <entry>Cb<subscript>10</subscript></entry>
> + <entry>Cr<subscript>10</subscript></entry>
> + <entry>Cb<subscript>11</subscript></entry>
> + <entry>Cr<subscript>11</subscript></entry>
> + <entry>Cb<subscript>12</subscript></entry>
> + <entry>Cr<subscript>12</subscript></entry>
> + <entry>Cb<subscript>13</subscript></entry>
> + <entry>Cr<subscript>13</subscript></entry>
> + </row>
> + <row>
> + <entry>start + 32:</entry>
> + <entry>Cb<subscript>20</subscript></entry>
> + <entry>Cr<subscript>20</subscript></entry>
> + <entry>Cb<subscript>21</subscript></entry>
> + <entry>Cr<subscript>21</subscript></entry>
> + <entry>Cb<subscript>22</subscript></entry>
> + <entry>Cr<subscript>22</subscript></entry>
> + <entry>Cb<subscript>23</subscript></entry>
> + <entry>Cr<subscript>23</subscript></entry>
> + </row>
> + <row>
> + <entry>start + 40:</entry>
> + <entry>Cb<subscript>30</subscript></entry>
> + <entry>Cr<subscript>30</subscript></entry>
> + <entry>Cb<subscript>31</subscript></entry>
> + <entry>Cr<subscript>31</subscript></entry>
> + <entry>Cb<subscript>32</subscript></entry>
> + <entry>Cr<subscript>32</subscript></entry>
> + <entry>Cb<subscript>33</subscript></entry>
> + <entry>Cr<subscript>33</subscript></entry>
> + </row>
> + </tbody>
> + </tgroup>
> + </informaltable>
> + </para>
> + </formalpara>
> + </example>
> + </refsect1>
> + </refentry>
> +
> + <!--
> +Local Variables:
> +mode: sgml
> +sgml-parent-document: "pixfmt.sgml"
> +indent-tabs-mode: nil
> +End:
> + -->
> diff --git a/Documentation/DocBook/media/v4l/pixfmt.xml b/Documentation/DocBook/media/v4l/pixfmt.xml
> index 2ff6b77..aef4615 100644
> --- a/Documentation/DocBook/media/v4l/pixfmt.xml
> +++ b/Documentation/DocBook/media/v4l/pixfmt.xml
> @@ -714,6 +714,7 @@ information.</para>
> &sub-nv12m;
> &sub-nv12mt;
> &sub-nv16;
> + &sub-nv24;
> &sub-m420;
> </section>
>
> diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
> index fca24cc..8225163 100644
> --- a/include/linux/videodev2.h
> +++ b/include/linux/videodev2.h
> @@ -343,6 +343,8 @@ struct v4l2_pix_format {
> #define V4L2_PIX_FMT_NV21 v4l2_fourcc('N', 'V', '2', '1') /* 12 Y/CrCb 4:2:0 */
> #define V4L2_PIX_FMT_NV16 v4l2_fourcc('N', 'V', '1', '6') /* 16 Y/CbCr 4:2:2 */
> #define V4L2_PIX_FMT_NV61 v4l2_fourcc('N', 'V', '6', '1') /* 16 Y/CrCb 4:2:2 */
> +#define V4L2_PIX_FMT_NV24 v4l2_fourcc('N', 'V', '2', '4') /* 24 Y/CbCr 4:4:4 */
> +#define V4L2_PIX_FMT_NV42 v4l2_fourcc('N', 'V', '4', '2') /* 24 Y/CrCb 4:4:4 */
>
> /* two non contiguous planes - one Y, one Cr + Cb interleaved */
> #define V4L2_PIX_FMT_NV12M v4l2_fourcc('N', 'M', '1', '2') /* 12 Y/CbCr 4:2:0 */
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