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Based on kernel version 3.15.4. Page generated on 2014-07-07 09:02 EST.

1	    <refentry id="V4L2-PIX-FMT-YUV411P">
2	      <refmeta>
3		<refentrytitle>V4L2_PIX_FMT_YUV411P ('411P')</refentrytitle>
4		&manvol;
5	      </refmeta>
6	      <refnamediv>
7		<refname><constant>V4L2_PIX_FMT_YUV411P</constant></refname>
8		<refpurpose>Format with &frac14; horizontal chroma resolution,
9	also known as YUV 4:1:1. Planar layout as opposed to
10	<constant>V4L2_PIX_FMT_Y41P</constant></refpurpose>
11	      </refnamediv>
12	      <refsect1>
13		<title>Description</title>
14	
15		<para>This format is not commonly used. This is a planar
16	format similar to the 4:2:2 planar format except with half as many
17	chroma. The three components are separated into three sub-images or
18	planes. The Y plane is first. The Y plane has one byte per pixel. The
19	Cb plane immediately follows the Y plane in memory. The Cb plane is
20	&frac14; the width of the Y plane (and of the image). Each Cb belongs
21	to 4 pixels all on the same row. For example,
22	Cb<subscript>0</subscript> belongs to Y'<subscript>00</subscript>,
23	Y'<subscript>01</subscript>, Y'<subscript>02</subscript> and
24	Y'<subscript>03</subscript>. Following the Cb plane is the Cr plane,
25	just like the Cb plane.</para>
26	
27		<para>If the Y plane has pad bytes after each row, then the Cr
28	and Cb planes have &frac14; as many pad bytes after their rows. In
29	other words, four C x rows (including padding) is exactly as long as
30	one Y row (including padding).</para>
31	
32		<example>
33		  <title><constant>V4L2_PIX_FMT_YUV411P</constant> 4 &times; 4
34	pixel image</title>
35	
36		  <formalpara>
37		    <title>Byte Order.</title>
38		    <para>Each cell is one byte.
39			<informaltable frame="none">
40			<tgroup cols="5" align="center">
41			  <colspec align="left" colwidth="2*" />
42			  <tbody valign="top">
43			    <row>
44			      <entry>start&nbsp;+&nbsp;0:</entry>
45			      <entry>Y'<subscript>00</subscript></entry>
46			      <entry>Y'<subscript>01</subscript></entry>
47			      <entry>Y'<subscript>02</subscript></entry>
48			      <entry>Y'<subscript>03</subscript></entry>
49			    </row>
50			    <row>
51			      <entry>start&nbsp;+&nbsp;4:</entry>
52			      <entry>Y'<subscript>10</subscript></entry>
53			      <entry>Y'<subscript>11</subscript></entry>
54			      <entry>Y'<subscript>12</subscript></entry>
55			      <entry>Y'<subscript>13</subscript></entry>
56			    </row>
57			    <row>
58			      <entry>start&nbsp;+&nbsp;8:</entry>
59			      <entry>Y'<subscript>20</subscript></entry>
60			      <entry>Y'<subscript>21</subscript></entry>
61			      <entry>Y'<subscript>22</subscript></entry>
62			      <entry>Y'<subscript>23</subscript></entry>
63			    </row>
64			    <row>
65			      <entry>start&nbsp;+&nbsp;12:</entry>
66			      <entry>Y'<subscript>30</subscript></entry>
67			      <entry>Y'<subscript>31</subscript></entry>
68			      <entry>Y'<subscript>32</subscript></entry>
69			      <entry>Y'<subscript>33</subscript></entry>
70			    </row>
71			    <row>
72			      <entry>start&nbsp;+&nbsp;16:</entry>
73			      <entry>Cb<subscript>00</subscript></entry>
74			    </row>
75			    <row>
76			      <entry>start&nbsp;+&nbsp;17:</entry>
77			      <entry>Cb<subscript>10</subscript></entry>
78			    </row>
79			    <row>
80			      <entry>start&nbsp;+&nbsp;18:</entry>
81			      <entry>Cb<subscript>20</subscript></entry>
82			    </row>
83			    <row>
84			      <entry>start&nbsp;+&nbsp;19:</entry>
85			      <entry>Cb<subscript>30</subscript></entry>
86			    </row>
87			    <row>
88			      <entry>start&nbsp;+&nbsp;20:</entry>
89			      <entry>Cr<subscript>00</subscript></entry>
90			    </row>
91			    <row>
92			      <entry>start&nbsp;+&nbsp;21:</entry>
93			      <entry>Cr<subscript>10</subscript></entry>
94			    </row>
95			    <row>
96			      <entry>start&nbsp;+&nbsp;22:</entry>
97			      <entry>Cr<subscript>20</subscript></entry>
98			    </row>
99			    <row>
100			      <entry>start&nbsp;+&nbsp;23:</entry>
101			      <entry>Cr<subscript>30</subscript></entry>
102			    </row>
103			  </tbody>
104			</tgroup>
105			</informaltable>
106		      </para>
107		  </formalpara>
108	
109		  <formalpara>
110		    <title>Color Sample Location.</title>
111		    <para>
112			<informaltable frame="none">
113			<tgroup cols="7" align="center">
114			  <tbody valign="top">
115			    <row>
116			      <entry></entry>
117			      <entry>0</entry><entry></entry><entry>1</entry><entry></entry>
118			      <entry>2</entry><entry></entry><entry>3</entry>
119			    </row>
120			    <row>
121			      <entry>0</entry>
122			      <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
123			      <entry>Y</entry><entry></entry><entry>Y</entry>
124			    </row>
125			    <row>
126			      <entry>1</entry>
127			      <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
128			      <entry>Y</entry><entry></entry><entry>Y</entry>
129			    </row>
130			    <row>
131			      <entry>2</entry>
132			      <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
133			      <entry>Y</entry><entry></entry><entry>Y</entry>
134			    </row>
135			    <row>
136			      <entry>3</entry>
137			      <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry>
138			      <entry>Y</entry><entry></entry><entry>Y</entry>
139			    </row>
140			  </tbody>
141			</tgroup>
142			</informaltable>
143		      </para>
144		  </formalpara>
145		</example>
146	      </refsect1>
147	    </refentry>
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