This patch adds the following new fourcc definition.
For multiplanar YCrCb
- V4L2_PIX_FMT_YVU420M - 'YVUM'
Signed-off-by: Shaik Ameer Basha <shaik.ameer@xxxxxxxxxxx>
---
Documentation/DocBook/media/v4l/pixfmt-yuv420m.xml | 97 +++++++++++++++++---
include/linux/videodev2.h | 1 +
2 files changed, 84 insertions(+), 14 deletions(-)
diff --git a/Documentation/DocBook/media/v4l/pixfmt-yuv420m.xml b/Documentation/DocBook/media/v4l/pixfmt-yuv420m.xml
index 60308f1..9fc9a2e 100644
--- a/Documentation/DocBook/media/v4l/pixfmt-yuv420m.xml
+++ b/Documentation/DocBook/media/v4l/pixfmt-yuv420m.xml
@@ -1,12 +1,14 @@
- <refentry id="V4L2-PIX-FMT-YUV420M">
+ <refentry>
<refmeta>
- <refentrytitle>V4L2_PIX_FMT_YUV420M ('YM12')</refentrytitle>
+ <refentrytitle>V4L2_PIX_FMT_YUV420M ('YM12'), V4L2_PIX_FMT_YVU420M ('YMUM')</refentrytitle>
&manvol;
</refmeta>
<refnamediv>
- <refname> <constant>V4L2_PIX_FMT_YUV420M</constant></refname>
- <refpurpose>Variation of <constant>V4L2_PIX_FMT_YUV420</constant>
- with planes non contiguous in memory. </refpurpose>
+ <refname id="V4L2_PIX_FMT_YUV420M"><constant>V4L2_PIX_FMT_YUV420M</constant></refname>
+ <refname id="V4L2_PIX_FMT_YVU420M"><constant>V4L2_PIX_FMT_YVU420M</constant></refname>
+ <refpurpose>Variation of <constant>V4L2_PIX_FMT_YUV420</constant>,
+ <constant>V4L2_PIX_FMT_YVU420</constant> respectively with planes non contiguous in memory.
+ </refpurpose>
</refnamediv>
<refsect1>
@@ -16,29 +18,34 @@
The three components are separated into three sub- images or planes.
The Y plane is first. The Y plane has one byte per pixel. The Cb data
-constitutes the second plane which is half the width and half
-the height of the Y plane (and of the image). Each Cb belongs to four
+constitutes the second plane for <constant>V4L2_PIX_FMT_YUV420M</constant> format
+and the third plane for <constant>V4L2_PIX_FMT_YVU420M</constant> format,
+which is half the width and half the height of the Y plane (and of the image).
+Each Cb belongs to four
pixels, a two-by-two square of the image. For example,
Cb<subscript>0</subscript> belongs to Y'<subscript>00</subscript>,
Y'<subscript>01</subscript>, Y'<subscript>10</subscript>, and
-Y'<subscript>11</subscript>. The Cr data, just like the Cb plane, is
-in the third plane. </para>
+Y'<subscript>11</subscript>. The Cr data, just like the Cb data, constitutes
+the third plane for <constant>V4L2_PIX_FMT_YUV420M</constant> format and
+the second plane for <constant>V4L2_PIX_FMT_YVU420M</constant> format. </para>
<para>If the Y plane has pad bytes after each row, then the Cb
and Cr planes have half as many pad bytes after their rows. In other
-words, two Cx rows (including padding) is exactly as long as one Y row
+words, two Cx rows (including padding) are exactly as long as one Y row
(including padding).</para>
- <para><constant>V4L2_PIX_FMT_NV12M</constant> is intended to be
+ <para><constant>V4L2_PIX_FMT_YUV420M</constant>,
+<constant>V4L2_PIX_FMT_YVU420M</constant> are intended to be
used only in drivers and applications that support the multi-planar API,
described in <xref linkend="planar-apis"/>. </para>
<example>
- <title><constant>V4L2_PIX_FMT_YVU420M</constant> 4 × 4
-pixel image</title>
+ <title><constant>V4L2_PIX_FMT_YUV420M</constant>,
+ <constant>V4L2_PIX_FMT_YVU420M</constant> 4 × 4
+ pixel image</title>
<formalpara>
- <title>Byte Order.</title>
+ <title>Byte Order for V4L2_PIX_FMT_YUV420M.</title>
<para>Each cell is one byte.
<informaltable frame="none">
<tgroup cols="5" align="center">
@@ -101,6 +108,68 @@ pixel image</title>
</formalpara>
<formalpara>
+ <title>Byte Order for V4L2_PIX_FMT_YVU420M.</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>start0 + 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>start0 + 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>start0 + 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>start0 + 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></entry></row>
+ <row>
+ <entry>start1 + 0:</entry>
+ <entry>Cr<subscript>00</subscript></entry>
+ <entry>Cr<subscript>01</subscript></entry>
+ </row>
+ <row>
+ <entry>start1 + 2:</entry>
+ <entry>Cr<subscript>10</subscript></entry>
+ <entry>Cr<subscript>11</subscript></entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry>start2 + 0:</entry>
+ <entry>Cb<subscript>00</subscript></entry>
+ <entry>Cb<subscript>01</subscript></entry>
+ </row>
+ <row>
+ <entry>start2 + 2:</entry>
+ <entry>Cb<subscript>10</subscript></entry>
+ <entry>Cb<subscript>11</subscript></entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </informaltable>
+ </para>
+ </formalpara>
+ <formalpara>
<title>Color Sample Location.</title>
<para>
<informaltable frame="none">
diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
index dbf9d3a..80962b8 100644
--- a/include/linux/videodev2.h
+++ b/include/linux/videodev2.h
@@ -365,6 +365,7 @@ struct v4l2_pix_format {
/* three non contiguous planes - Y, Cb, Cr */
#define V4L2_PIX_FMT_YUV420M v4l2_fourcc('Y', 'M', '1', '2') /* 12 YUV420 planar */
+#define V4L2_PIX_FMT_YVU420M v4l2_fourcc('Y', 'V', 'U', 'M') /* 12 YVU420 planar */
/* Bayer formats - see http://www.siliconimaging.com/RGB%20Bayer.htm */
#define V4L2_PIX_FMT_SBGGR8 v4l2_fourcc('B', 'A', '8', '1') /* 8 BGBG.. GRGR.. */
--
1.7.0.4
--
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