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authorMauro Carvalho Chehab <mchehab@redhat.com>2011-05-31 16:27:44 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2011-07-27 17:52:05 -0300
commit4266129964b8238526936d723de65b419d8069c6 (patch)
tree38c6b5cd3dc99b8599391ffad3b87e399bef56a2 /Documentation/DocBook/media/v4l/pixfmt-yuyv.xml
parent04893043ae9ea8aa82b712491ed25ba6c4ffbca3 (diff)
[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>
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+ <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>
+
+ <!--
+Local Variables:
+mode: sgml
+sgml-parent-document: "pixfmt.sgml"
+indent-tabs-mode: nil
+End:
+ -->