[media] v4l: Add new YVU420 multi planar fourcc definition
This patch adds new 'YM21' fourcc definition for multiplanar YCrCb pixel format - V4L2_PIX_FMT_YVU420M. Signed-off-by: Shaik Ameer Basha <shaik.ameer@samsung.com> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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Shaik Ameer Basha
Mauro Carvalho Chehab
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aa15f47714
commit
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3 changed files with 156 additions and 0 deletions
154
Documentation/DocBook/media/v4l/pixfmt-yvu420m.xml
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154
Documentation/DocBook/media/v4l/pixfmt-yvu420m.xml
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<refentry id="V4L2-PIX-FMT-YVU420M">
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<refmeta>
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<refentrytitle>V4L2_PIX_FMT_YVU420M ('YM21')</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname> <constant>V4L2_PIX_FMT_YVU420M</constant></refname>
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<refpurpose>Variation of <constant>V4L2_PIX_FMT_YVU420</constant>
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with planes non contiguous in memory. </refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<para>This is a multi-planar format, as opposed to a packed format.
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The three components are separated into three sub-images or planes.
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The Y plane is first. The Y plane has one byte per pixel. The Cr data
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constitutes the second plane which is half the width and half
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the height of the Y plane (and of the image). Each Cr belongs to four
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pixels, a two-by-two square of the image. For example,
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Cr<subscript>0</subscript> belongs to Y'<subscript>00</subscript>,
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Y'<subscript>01</subscript>, Y'<subscript>10</subscript>, and
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Y'<subscript>11</subscript>. The Cb data, just like the Cr plane, constitutes
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the third plane. </para>
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<para>If the Y plane has pad bytes after each row, then the Cr
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and Cb planes have half as many pad bytes after their rows. In other
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words, two Cx rows (including padding) is exactly as long as one Y row
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(including padding).</para>
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<para><constant>V4L2_PIX_FMT_YVU420M</constant> is intended to be
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used only in drivers and applications that support the multi-planar API,
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described in <xref linkend="planar-apis"/>. </para>
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<example>
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<title><constant>V4L2_PIX_FMT_YVU420M</constant> 4 × 4
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pixel image</title>
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<formalpara>
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<title>Byte Order.</title>
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<para>Each cell is one byte.
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<informaltable frame="none">
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<tgroup cols="5" align="center">
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<colspec align="left" colwidth="2*" />
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<tbody valign="top">
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<row>
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<entry>start0 + 0:</entry>
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<entry>Y'<subscript>00</subscript></entry>
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<entry>Y'<subscript>01</subscript></entry>
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<entry>Y'<subscript>02</subscript></entry>
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<entry>Y'<subscript>03</subscript></entry>
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</row>
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<row>
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<entry>start0 + 4:</entry>
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<entry>Y'<subscript>10</subscript></entry>
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<entry>Y'<subscript>11</subscript></entry>
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<entry>Y'<subscript>12</subscript></entry>
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<entry>Y'<subscript>13</subscript></entry>
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</row>
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<row>
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<entry>start0 + 8:</entry>
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<entry>Y'<subscript>20</subscript></entry>
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<entry>Y'<subscript>21</subscript></entry>
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<entry>Y'<subscript>22</subscript></entry>
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<entry>Y'<subscript>23</subscript></entry>
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</row>
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<row>
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<entry>start0 + 12:</entry>
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<entry>Y'<subscript>30</subscript></entry>
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<entry>Y'<subscript>31</subscript></entry>
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<entry>Y'<subscript>32</subscript></entry>
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<entry>Y'<subscript>33</subscript></entry>
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</row>
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<row><entry></entry></row>
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<row>
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<entry>start1 + 0:</entry>
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<entry>Cr<subscript>00</subscript></entry>
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<entry>Cr<subscript>01</subscript></entry>
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</row>
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<row>
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<entry>start1 + 2:</entry>
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<entry>Cr<subscript>10</subscript></entry>
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<entry>Cr<subscript>11</subscript></entry>
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</row>
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<row><entry></entry></row>
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<row>
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<entry>start2 + 0:</entry>
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<entry>Cb<subscript>00</subscript></entry>
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<entry>Cb<subscript>01</subscript></entry>
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</row>
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<row>
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<entry>start2 + 2:</entry>
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<entry>Cb<subscript>10</subscript></entry>
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<entry>Cb<subscript>11</subscript></entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</para>
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</formalpara>
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<formalpara>
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<title>Color Sample Location.</title>
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<para>
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<informaltable frame="none">
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<tgroup cols="7" align="center">
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<tbody valign="top">
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<row>
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<entry></entry>
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<entry>0</entry><entry></entry><entry>1</entry><entry></entry>
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<entry>2</entry><entry></entry><entry>3</entry>
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</row>
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<row>
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<entry>0</entry>
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<entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
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<entry>Y</entry><entry></entry><entry>Y</entry>
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</row>
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<row>
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<entry></entry>
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<entry></entry><entry>C</entry><entry></entry><entry></entry>
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<entry></entry><entry>C</entry><entry></entry>
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</row>
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<row>
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<entry>1</entry>
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<entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
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<entry>Y</entry><entry></entry><entry>Y</entry>
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</row>
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<row>
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<entry></entry>
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</row>
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<row>
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<entry>2</entry>
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<entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
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<entry>Y</entry><entry></entry><entry>Y</entry>
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</row>
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<row>
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<entry></entry>
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<entry></entry><entry>C</entry><entry></entry><entry></entry>
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<entry></entry><entry>C</entry><entry></entry>
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</row>
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<row>
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<entry>3</entry>
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<entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
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<entry>Y</entry><entry></entry><entry>Y</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</para>
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</formalpara>
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</example>
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</refsect1>
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</refentry>
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@ -708,6 +708,7 @@ information.</para>
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&sub-y41p;
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&sub-y41p;
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&sub-yuv420;
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&sub-yuv420;
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&sub-yuv420m;
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&sub-yuv420m;
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&sub-yvu420m;
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&sub-yuv410;
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&sub-yuv410;
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&sub-yuv422p;
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&sub-yuv422p;
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&sub-yuv411p;
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&sub-yuv411p;
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@ -368,6 +368,7 @@ struct v4l2_pix_format {
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/* three non contiguous planes - Y, Cb, Cr */
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/* three non contiguous planes - Y, Cb, Cr */
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#define V4L2_PIX_FMT_YUV420M v4l2_fourcc('Y', 'M', '1', '2') /* 12 YUV420 planar */
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#define V4L2_PIX_FMT_YUV420M v4l2_fourcc('Y', 'M', '1', '2') /* 12 YUV420 planar */
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#define V4L2_PIX_FMT_YVU420M v4l2_fourcc('Y', 'M', '2', '1') /* 12 YVU420 planar */
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/* Bayer formats - see http://www.siliconimaging.com/RGB%20Bayer.htm */
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/* Bayer formats - see http://www.siliconimaging.com/RGB%20Bayer.htm */
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#define V4L2_PIX_FMT_SBGGR8 v4l2_fourcc('B', 'A', '8', '1') /* 8 BGBG.. GRGR.. */
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#define V4L2_PIX_FMT_SBGGR8 v4l2_fourcc('B', 'A', '8', '1') /* 8 BGBG.. GRGR.. */
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