Hi Manjunath,
Thank you for the patch.
A couple of comments below.
On Friday 30 March 2012 10:09:14 Hadli, Manjunath wrote:
> add new macro V4L2_PIX_FMT_SGRBG10ALAW8 and associated formats
> to represent Bayer format frames compressed by A-LAW algorithm,
> add V4L2_PIX_FMT_UV8 to represent storage of CbCr data (UV interleaved)
> only.
>
> Signed-off-by: Manjunath Hadli <manjunath.ha...@ti.com>
> Cc: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
> Cc: Sakari Ailus <sakari.ai...@iki.fi>
> Cc: Hans Verkuil <hans.verk...@cisco.com>
> ---
> .../DocBook/media/v4l/pixfmt-srggb10alaw8.xml | 34 +++++++++++
> Documentation/DocBook/media/v4l/pixfmt-uv8.xml | 62
> ++++++++++++++++++++ Documentation/DocBook/media/v4l/pixfmt.xml |
> 2 +
> include/linux/videodev2.h | 8 +++
> 4 files changed, 106 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/DocBook/media/v4l/pixfmt-srggb10alaw8.xml
> create mode 100644 Documentation/DocBook/media/v4l/pixfmt-uv8.xml
>
> diff --git a/Documentation/DocBook/media/v4l/pixfmt-srggb10alaw8.xml
> b/Documentation/DocBook/media/v4l/pixfmt-srggb10alaw8.xml new file mode
> 100644
> index 0000000..9b5c80d
> --- /dev/null
> +++ b/Documentation/DocBook/media/v4l/pixfmt-srggb10alaw8.xml
> @@ -0,0 +1,34 @@
> + <refentry>
> + <refmeta>
> + <refentrytitle>
> + V4L2_PIX_FMT_SRGGB10ALAW8 ('aRA8'),
> + V4L2_PIX_FMT_SGRBG10ALAW8 ('agA8'),
> + V4L2_PIX_FMT_SGBRG10ALAW8 ('aGA8'),
> + V4L2_PIX_FMT_SBGGR10ALAW8 ('aBA8'),
> + </refentrytitle>
> + &manvol;
> + </refmeta>
> + <refnamediv>
> + <refname id="V4L2-PIX-FMT-SRGGB10ALAW8">
> + <constant>V4L2_PIX_FMT_SRGGB10ALAW8</constant>
> + </refname>
> + <refname id="V4L2-PIX-FMT-SGRBG10ALAW8">
> + <constant>V4L2_PIX_FMT_SGRBG10ALAW8</constant>
> + </refname>
> + <refname id="V4L2-PIX-FMT-SGBRG10ALAW8">
> + <constant>V4L2_PIX_FMT_SGBRG10ALAW8</constant>
> + </refname>
> + <refname id="V4L2-PIX-FMT-SBGGR10ALAW8">
> + <constant>V4L2_PIX_FMT_SBGGR10ALAW8</constant>
> + </refname>
> + <refpurpose>10-bit Bayer formats compressed to 8 bits</refpurpose>
> + </refnamediv>
> + <refsect1>
> + <title>Description</title>
> + <para>The following four pixel formats are raw sRGB / Bayer
> + formats with 10 bits per colour compressed to 8 bits each,
> + using the A-LAW algorithm. Each colour component consumes 8
> + bits of memory. In other respects this format is similar to
> + <xref linkend="V4L2-PIX-FMT-SRGGB8">.</xref></para>
> + </refsect1>
> + </refentry>
> diff --git a/Documentation/DocBook/media/v4l/pixfmt-uv8.xml
> b/Documentation/DocBook/media/v4l/pixfmt-uv8.xml new file mode 100644
> index 0000000..c507c1f
> --- /dev/null
> +++ b/Documentation/DocBook/media/v4l/pixfmt-uv8.xml
> @@ -0,0 +1,62 @@
> + <refentry id="V4L2-PIX-FMT-UV8">
> + <refmeta>
> + <refentrytitle>V4L2_PIX_FMT_UV8 ('UV8')</refentrytitle>
> + &manvol;
> + </refmeta>
> + <refnamediv>
> + <refname><constant>V4L2_PIX_FMT_UV8</constant></refname>
> + <refpurpose>UV plane interleaved</refpurpose>
> + </refnamediv>
> + <refsect1>
> + <title>Description</title>
> + <para>In this format there is no Y plane, Only CbCr plane. ie
> + (UV interleaved)</para>
> + <example>
> + <title>
> + <constant>V4L2_PIX_FMT_UV8</constant>
> + pixel image
> + </title>
> +
> + <formalpara>
> + <title>Byte Order.</title>
> + <para>Each cell is one byte.
> + <informaltable frame="none">
> + <tgroup cols="5" align="center">
> + <colspec align="left" colwidth="2*" />
> + <tbody valign="top">
> + <row>
> + <entry>start + 0:</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>
> + </row>
> + <row>
> + <entry>start + 4:</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>
> + </row>
> + <row>
> + <entry>start + 8:</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>
> + </row>
> + <row>
> + <entry>start + 12:</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>
> + </row>
> + </tbody>
> + </tgroup>
> + </informaltable>
> + </para>
> + </formalpara>
> + </example>
> + </refsect1>
> + </refentry>
> diff --git a/Documentation/DocBook/media/v4l/pixfmt.xml
> b/Documentation/DocBook/media/v4l/pixfmt.xml index 74d4fcd..9dc3024 100644
> --- a/Documentation/DocBook/media/v4l/pixfmt.xml
> +++ b/Documentation/DocBook/media/v4l/pixfmt.xml
> @@ -674,6 +674,7 @@ access the palette, this must be done with ioctls of the
> Linux framebuffer API.< &sub-sbggr16;
> &sub-srggb10;
> &sub-srggb10dpcm8;
> + &sub-srggb10alaw8;
Please move the ALAW formats above the DPCM formats to keep them
alphabetically sorted.
> &sub-srggb12;
> </section>
>
> @@ -701,6 +702,7 @@ information.</para>
> &sub-y12;
> &sub-y10b;
> &sub-y16;
> + &sub-uv8;
> &sub-yuyv;
> &sub-uyvy;
> &sub-yvyu;
> diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
> index dbc0d77..71f9f94 100644
> --- a/include/linux/videodev2.h
> +++ b/include/linux/videodev2.h
> @@ -328,6 +328,9 @@ struct v4l2_pix_format {
> /* Palette formats */
> #define V4L2_PIX_FMT_PAL8 v4l2_fourcc('P', 'A', 'L', '8') /* 8 8-bit
> palette */
>
> +/* Chrominance formats */
> +#define V4L2_PIX_FMT_UV8 v4l2_fourcc('U', 'V', '8', ' ') /* 8 UV 4:4
> */ +
> /* Luminance+Chrominance formats */
> #define V4L2_PIX_FMT_YVU410 v4l2_fourcc('Y', 'V', 'U', '9') /* 9 YVU
> 4:1:0 */ #define V4L2_PIX_FMT_YVU420 v4l2_fourcc('Y', 'V', '1', '2')
> /* 12 YVU 4:2:0 */ @@ -382,6 +385,11 @@ struct v4l2_pix_format {
> #define V4L2_PIX_FMT_SGBRG10DPCM8 v4l2_fourcc('b', 'G', 'A', '8')
> #define V4L2_PIX_FMT_SGRBG10DPCM8 v4l2_fourcc('B', 'D', '1', '0')
> #define V4L2_PIX_FMT_SRGGB10DPCM8 v4l2_fourcc('b', 'R', 'A', '8')
> + /* 10bit raw bayer a-law compressed to 8 bits */
> +#define V4L2_PIX_FMT_SBGGR10ALAW8 v4l2_fourcc('a', 'B', 'A', '8')
> +#define V4L2_PIX_FMT_SGBRG10ALAW8 v4l2_fourcc('a', 'G', 'A', '8')
> +#define V4L2_PIX_FMT_SGRBG10ALAW8 v4l2_fourcc('a', 'g', 'A', '8')
> +#define V4L2_PIX_FMT_SRGGB10ALAW8 v4l2_fourcc('a', 'R', 'A', '8')
Please move the ALAW formats above the DPCM formats to keep them
alphabetically sorted.
We still have no clear fourcc allocation scheme for Bayer formats, but I
suppose I'll need to give up on that.
> /*
> * 10bit raw bayer, expanded to 16 bits
> * xxxxrrrrrrrrrrxxxxgggggggggg xxxxggggggggggxxxxbbbbbbbbbb...
--
Regards,
Laurent Pinchart
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