1    <refentry>
2      <refmeta>
3	<refentrytitle>V4L2_PIX_FMT_SRGGB12 ('RG12'),
4	 V4L2_PIX_FMT_SGRBG12 ('BA12'),
5	 V4L2_PIX_FMT_SGBRG12 ('GB12'),
6	 V4L2_PIX_FMT_SBGGR12 ('BG12'),
7	 </refentrytitle>
8	&manvol;
9      </refmeta>
10      <refnamediv>
11	<refname id="V4L2-PIX-FMT-SRGGB12"><constant>V4L2_PIX_FMT_SRGGB12</constant></refname>
12	<refname id="V4L2-PIX-FMT-SGRBG12"><constant>V4L2_PIX_FMT_SGRBG12</constant></refname>
13	<refname id="V4L2-PIX-FMT-SGBRG12"><constant>V4L2_PIX_FMT_SGBRG12</constant></refname>
14	<refname id="V4L2-PIX-FMT-SBGGR12"><constant>V4L2_PIX_FMT_SBGGR12</constant></refname>
15	<refpurpose>12-bit Bayer formats expanded to 16 bits</refpurpose>
16      </refnamediv>
17      <refsect1>
18	<title>Description</title>
19
20	<para>These four pixel formats are raw sRGB / Bayer formats with
2112 bits per colour. Each colour component is stored in a 16-bit word, with 4
22unused high bits filled with zeros. Each n-pixel row contains n/2 green samples
23and n/2 blue or red samples, with alternating red and blue rows. Bytes are
24stored in memory in little endian order. They are conventionally described
25as GRGR... BGBG..., RGRG... GBGB..., etc. Below is an example of one of these
26formats</para>
27
28    <example>
29      <title><constant>V4L2_PIX_FMT_SBGGR12</constant> 4 &times; 4
30pixel image</title>
31
32      <formalpara>
33	<title>Byte Order.</title>
34	<para>Each cell is one byte, high 6 bits in high bytes are 0.
35	  <informaltable frame="none">
36	    <tgroup cols="5" align="center">
37	      <colspec align="left" colwidth="2*" />
38	      <tbody valign="top">
39		<row>
40		  <entry>start&nbsp;+&nbsp;0:</entry>
41		  <entry>B<subscript>00low</subscript></entry>
42		  <entry>B<subscript>00high</subscript></entry>
43		  <entry>G<subscript>01low</subscript></entry>
44		  <entry>G<subscript>01high</subscript></entry>
45		  <entry>B<subscript>02low</subscript></entry>
46		  <entry>B<subscript>02high</subscript></entry>
47		  <entry>G<subscript>03low</subscript></entry>
48		  <entry>G<subscript>03high</subscript></entry>
49		</row>
50		<row>
51		  <entry>start&nbsp;+&nbsp;8:</entry>
52		  <entry>G<subscript>10low</subscript></entry>
53		  <entry>G<subscript>10high</subscript></entry>
54		  <entry>R<subscript>11low</subscript></entry>
55		  <entry>R<subscript>11high</subscript></entry>
56		  <entry>G<subscript>12low</subscript></entry>
57		  <entry>G<subscript>12high</subscript></entry>
58		  <entry>R<subscript>13low</subscript></entry>
59		  <entry>R<subscript>13high</subscript></entry>
60		</row>
61		<row>
62		  <entry>start&nbsp;+&nbsp;16:</entry>
63		  <entry>B<subscript>20low</subscript></entry>
64		  <entry>B<subscript>20high</subscript></entry>
65		  <entry>G<subscript>21low</subscript></entry>
66		  <entry>G<subscript>21high</subscript></entry>
67		  <entry>B<subscript>22low</subscript></entry>
68		  <entry>B<subscript>22high</subscript></entry>
69		  <entry>G<subscript>23low</subscript></entry>
70		  <entry>G<subscript>23high</subscript></entry>
71		</row>
72		<row>
73		  <entry>start&nbsp;+&nbsp;24:</entry>
74		  <entry>G<subscript>30low</subscript></entry>
75		  <entry>G<subscript>30high</subscript></entry>
76		  <entry>R<subscript>31low</subscript></entry>
77		  <entry>R<subscript>31high</subscript></entry>
78		  <entry>G<subscript>32low</subscript></entry>
79		  <entry>G<subscript>32high</subscript></entry>
80		  <entry>R<subscript>33low</subscript></entry>
81		  <entry>R<subscript>33high</subscript></entry>
82		</row>
83	      </tbody>
84	    </tgroup>
85	  </informaltable>
86	</para>
87      </formalpara>
88    </example>
89  </refsect1>
90</refentry>
91