linux/Documentation/DocBook/media/v4l/pixfmt-yuyv.xml
Mauro Carvalho Chehab 4266129964 [media] DocBook: Move all media docbook stuff into its own directory
This patch addresses several issues pointed by Randy Dunlap
<rdunlap@xenotime.net> at changeset ece722c:

- In the generated index.html file, "media" is listed first, but it
  should be listed in alphabetical order, not first.

- The generated files are (hidden) in .tmpmedia/

- The link from the top-level index.html file to "media" is to
  media/index.html, but the file is actually in .tmpmedia/media/index.html

- Please build docs with and without using "O=builddir" and test that.

- Would it be possible for media to have its own Makefile instead of
  merging into this one?

Due to the way cleandocs target works, I had to rename the media DocBook
to media_api, otherwise cleandocs would remove the /media directory.

Thanks-to: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-07-27 17:52:05 -03:00

129 lines
4.2 KiB
XML

<refentry id="V4L2-PIX-FMT-YUYV">
<refmeta>
<refentrytitle>V4L2_PIX_FMT_YUYV ('YUYV')</refentrytitle>
&manvol;
</refmeta>
<refnamediv>
<refname><constant>V4L2_PIX_FMT_YUYV</constant></refname>
<refpurpose>Packed format with &frac12; horizontal chroma
resolution, also known as YUV 4:2:2</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>In this format each four bytes is two pixels. Each four
bytes is two Y's, a Cb and a Cr. Each Y goes to one of the pixels, and
the Cb and Cr belong to both pixels. As you can see, the Cr and Cb
components have half the horizontal resolution of the Y component.
<constant>V4L2_PIX_FMT_YUYV </constant> is known in the Windows
environment as YUY2.</para>
<example>
<title><constant>V4L2_PIX_FMT_YUYV</constant> 4 &times; 4
pixel image</title>
<formalpara>
<title>Byte Order.</title>
<para>Each cell is one byte.
<informaltable frame="none">
<tgroup cols="9" align="center">
<colspec align="left" colwidth="2*" />
<tbody valign="top">
<row>
<entry>start&nbsp;+&nbsp;0:</entry>
<entry>Y'<subscript>00</subscript></entry>
<entry>Cb<subscript>00</subscript></entry>
<entry>Y'<subscript>01</subscript></entry>
<entry>Cr<subscript>00</subscript></entry>
<entry>Y'<subscript>02</subscript></entry>
<entry>Cb<subscript>01</subscript></entry>
<entry>Y'<subscript>03</subscript></entry>
<entry>Cr<subscript>01</subscript></entry>
</row>
<row>
<entry>start&nbsp;+&nbsp;8:</entry>
<entry>Y'<subscript>10</subscript></entry>
<entry>Cb<subscript>10</subscript></entry>
<entry>Y'<subscript>11</subscript></entry>
<entry>Cr<subscript>10</subscript></entry>
<entry>Y'<subscript>12</subscript></entry>
<entry>Cb<subscript>11</subscript></entry>
<entry>Y'<subscript>13</subscript></entry>
<entry>Cr<subscript>11</subscript></entry>
</row>
<row>
<entry>start&nbsp;+&nbsp;16:</entry>
<entry>Y'<subscript>20</subscript></entry>
<entry>Cb<subscript>20</subscript></entry>
<entry>Y'<subscript>21</subscript></entry>
<entry>Cr<subscript>20</subscript></entry>
<entry>Y'<subscript>22</subscript></entry>
<entry>Cb<subscript>21</subscript></entry>
<entry>Y'<subscript>23</subscript></entry>
<entry>Cr<subscript>21</subscript></entry>
</row>
<row>
<entry>start&nbsp;+&nbsp;24:</entry>
<entry>Y'<subscript>30</subscript></entry>
<entry>Cb<subscript>30</subscript></entry>
<entry>Y'<subscript>31</subscript></entry>
<entry>Cr<subscript>30</subscript></entry>
<entry>Y'<subscript>32</subscript></entry>
<entry>Cb<subscript>31</subscript></entry>
<entry>Y'<subscript>33</subscript></entry>
<entry>Cr<subscript>31</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>C</entry><entry>Y</entry><entry></entry>
<entry>Y</entry><entry>C</entry><entry>Y</entry>
</row>
<row>
<entry>1</entry>
<entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry>
<entry>Y</entry><entry>C</entry><entry>Y</entry>
</row>
<row>
<entry>2</entry>
<entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry>
<entry>Y</entry><entry>C</entry><entry>Y</entry>
</row>
<row>
<entry>3</entry>
<entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry>
<entry>Y</entry><entry>C</entry><entry>Y</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</formalpara>
</example>
</refsect1>
</refentry>
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