Hi Sylwester,
On Thursday 24 March 2011 15:19:54 Sylwester Nawrocki wrote:
> Add V4L2_MBUS_FMT_JPEG_1X8 format and the corresponding Docbook
> documentation.
>
> Signed-off-by: Sylwester Nawrocki <[email protected]>
> Signed-off-by: Kyungmin Park <[email protected]>
> ---
>
> Hi all,
>
> I would like to propose and addition of JPEG format to the list
> of media bus formats. The requirement of this format had already
> been discussed in the past [1], [2].
> This patch adds relevant entry in v4l2-mediabus.h header and
> the documentation. Initially I have added only bus width information
> to the format code. I am not sure what other information could be
> included. I am open to suggestions if anyone knows about any other
> requirements.
>
> JPEG format on media bus is, among others, required for Samsung
> S5P MIPI CSI receiver [3] and M-5MOLS camera drivers [4].
>
> Comments are welcome!
>
> --
> Regards,
> Sylwester Nawrocki,
> Samsung Poland R&D Center
>
> [1] http://www.spinics.net/lists/linux-media/msg27980.html
> [2] http://www.spinics.net/lists/linux-media/msg28651.html
> [3] http://www.spinics.net/lists/linux-samsung-soc/msg03807.html
> [4] http://lwn.net/Articles/433836/
> ---
> Documentation/DocBook/v4l/subdev-formats.xml | 45
> ++++++++++++++++++++++++++ include/linux/v4l2-mediabus.h |
> 3 ++
> 2 files changed, 48 insertions(+), 0 deletions(-)
>
> diff --git a/Documentation/DocBook/v4l/subdev-formats.xml
> b/Documentation/DocBook/v4l/subdev-formats.xml index b5376e2..60a6fe2
> 100644
> --- a/Documentation/DocBook/v4l/subdev-formats.xml
> +++ b/Documentation/DocBook/v4l/subdev-formats.xml
> @@ -2463,5 +2463,50 @@
> </tgroup>
> </table>
> </section>
> +
> + <section>
> + <title>JPEG Compressed Formats</title>
> +
> + <para>Those data formats are used to transfer arbitrary byte-based
> image + data obtained from JPEG compression process. The format code
> + is made of the following information.
> + <itemizedlist>
> + <listitem>The bus width in bits.</listitem>
> + </itemizedlist>
> +
> + <para>For instance, a format where bus width is 8 bits will be named
> + <constant>V4L2_MBUS_FMT_JPEG_1X8</constant>.
> + </para>
> +
> + </para>
> +
> + <para>The following table lists existing JPEG compressed
> formats.</para> +
> + <table pgwide="0" frame="none" id="v4l2-mbus-pixelcode-jpeg">
> + <title>JPEG Formats</title>
> + <tgroup cols="23">
> + <colspec colname="id" align="left" />
> + <colspec colname="code" align="left"/>
> + <colspec colname="remarks" align="left"/>
> + <thead>
> + <row>
> + <entry>Identifier</entry>
> + <entry>Code</entry>
> + <entry>Remarks</entry>
> + </row>
> + </thead>
> + <tbody valign="top">
> + <row id="V4L2-MBUS-FMT-JPEG-1X8">
> + <entry>V4L2_MBUS_FMT_JPEG_1X8</entry>
> + <entry>0x4001</entry>
> + <entry> This format shall be used for of transmission of JPEG
> + data over MIPI CSI-2 bus with User Defined 8-bit Data types.
JPEG formats are not limited to MIPI, some parallel sensors can transmit JPEG
as well.
> + </entry>
> + </row>
> +
> + </tbody>
> + </tgroup>
> + </table>
> + </section>
> </section>
> </section>
> diff --git a/include/linux/v4l2-mediabus.h b/include/linux/v4l2-mediabus.h
> index 7054a7a..15d6cda 100644
> --- a/include/linux/v4l2-mediabus.h
> +++ b/include/linux/v4l2-mediabus.h
> @@ -86,6 +86,9 @@ enum v4l2_mbus_pixelcode {
> V4L2_MBUS_FMT_SGBRG12_1X12 = 0x3010,
> V4L2_MBUS_FMT_SGRBG12_1X12 = 0x3011,
> V4L2_MBUS_FMT_SRGGB12_1X12 = 0x3012,
> +
> + /* JPEG compressed formats - next is 0x4002 */
> + V4L2_MBUS_FMT_JPEG_1X8 = 0x4001,
> };
>
> /**
--
Regards,
Laurent Pinchart
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