summaryrefslogtreecommitdiffstats
path: root/Documentation/DocBook/media/v4l/pixfmt-yuv420.xml
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/DocBook/media/v4l/pixfmt-yuv420.xml')
-rw-r--r--Documentation/DocBook/media/v4l/pixfmt-yuv420.xml149
1 files changed, 0 insertions, 149 deletions
diff --git a/Documentation/DocBook/media/v4l/pixfmt-yuv420.xml b/Documentation/DocBook/media/v4l/pixfmt-yuv420.xml
deleted file mode 100644
index 48649fa..0000000
--- a/Documentation/DocBook/media/v4l/pixfmt-yuv420.xml
+++ /dev/null
@@ -1,149 +0,0 @@
- <refentry>
- <refmeta>
- <refentrytitle>V4L2_PIX_FMT_YVU420 ('YV12'), V4L2_PIX_FMT_YUV420 ('YU12')</refentrytitle>
- &manvol;
- </refmeta>
- <refnamediv>
- <refname id="V4L2-PIX-FMT-YVU420"><constant>V4L2_PIX_FMT_YVU420</constant></refname>
- <refname id="V4L2-PIX-FMT-YUV420"><constant>V4L2_PIX_FMT_YUV420</constant></refname>
- <refpurpose>Planar formats with &frac12; horizontal and
-vertical chroma resolution, also known as YUV 4:2:0</refpurpose>
- </refnamediv>
- <refsect1>
- <title>Description</title>
-
- <para>These are planar formats, as opposed to a packed format.
-The three components are separated into three sub- images or planes.
-The Y plane is first. The Y plane has one byte per pixel. For
-<constant>V4L2_PIX_FMT_YVU420</constant>, the Cr plane immediately
-follows the Y plane in memory. The Cr plane is half the width and half
-the height of the Y plane (and of the image). Each Cr belongs to four
-pixels, a two-by-two square of the image. For example,
-Cr<subscript>0</subscript> belongs to Y'<subscript>00</subscript>,
-Y'<subscript>01</subscript>, Y'<subscript>10</subscript>, and
-Y'<subscript>11</subscript>. Following the Cr plane is the Cb plane,
-just like the Cr plane. <constant>V4L2_PIX_FMT_YUV420</constant> is
-the same except the Cb plane comes first, then the Cr plane.</para>
-
- <para>If the Y plane has pad bytes after each row, then the Cr
-and Cb 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
-(including padding).</para>
-
- <example>
- <title><constant>V4L2_PIX_FMT_YVU420</constant> 4 &times; 4
-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&nbsp;+&nbsp;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&nbsp;+&nbsp;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&nbsp;+&nbsp;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&nbsp;+&nbsp;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&nbsp;+&nbsp;16:</entry>
- <entry>Cr<subscript>00</subscript></entry>
- <entry>Cr<subscript>01</subscript></entry>
- </row>
- <row>
- <entry>start&nbsp;+&nbsp;18:</entry>
- <entry>Cr<subscript>10</subscript></entry>
- <entry>Cr<subscript>11</subscript></entry>
- </row>
- <row>
- <entry>start&nbsp;+&nbsp;20:</entry>
- <entry>Cb<subscript>00</subscript></entry>
- <entry>Cb<subscript>01</subscript></entry>
- </row>
- <row>
- <entry>start&nbsp;+&nbsp;22:</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">
- <tgroup cols="7" align="center">
- <tbody valign="top">
- <row>
- <entry></entry>
- <entry>0</entry><entry></entry><entry>1</entry><entry></entry>
- <entry>2</entry><entry></entry><entry>3</entry>
- </row>
- <row>
- <entry>0</entry>
- <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
- <entry>Y</entry><entry></entry><entry>Y</entry>
- </row>
- <row>
- <entry></entry>
- <entry></entry><entry>C</entry><entry></entry><entry></entry>
- <entry></entry><entry>C</entry><entry></entry>
- </row>
- <row>
- <entry>1</entry>
- <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
- <entry>Y</entry><entry></entry><entry>Y</entry>
- </row>
- <row>
- <entry></entry>
- </row>
- <row>
- <entry>2</entry>
- <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
- <entry>Y</entry><entry></entry><entry>Y</entry>
- </row>
- <row>
- <entry></entry>
- <entry></entry><entry>C</entry><entry></entry><entry></entry>
- <entry></entry><entry>C</entry><entry></entry>
- </row>
- <row>
- <entry>3</entry>
- <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
- <entry>Y</entry><entry></entry><entry>Y</entry>
- </row>
- </tbody>
- </tgroup>
- </informaltable>
- </para>
- </formalpara>
- </example>
- </refsect1>
- </refentry>