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gerrit-public.fairphone.software / kernel / msm-4.9 / 38a5d6736e7f714cc56d58692001e66dcbb98799 / . / Documentation / DocBook / v4l / pixfmt-nv16.xml
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Mauro Carvalho Chehab8e080c22009-09-13 22:16:04 -0300[diff] [blame]1 <refentry>
2 <refmeta>
3 <refentrytitle>V4L2_PIX_FMT_NV16 ('NV16'), V4L2_PIX_FMT_NV61 ('NV61')</refentrytitle>
4 &manvol;
5 </refmeta>
6 <refnamediv>
7 <refname id="V4L2-PIX-FMT-NV16"><constant>V4L2_PIX_FMT_NV16</constant></refname>
8 <refname id="V4L2-PIX-FMT-NV61"><constant>V4L2_PIX_FMT_NV61</constant></refname>
9 <refpurpose>Formats with &frac12; horizontal
10chroma resolution, also known as YUV 4:2:2. One luminance and one
11chrominance plane with alternating chroma samples as opposed to
12<constant>V4L2_PIX_FMT_YVU420</constant></refpurpose>
13 </refnamediv>
14 <refsect1>
15 <title>Description</title>
16
17 <para>These are two-plane versions of the YUV 4:2:2 format.
18The three components are separated into two sub-images or planes. The
19Y plane is first. The Y plane has one byte per pixel. For
20<constant>V4L2_PIX_FMT_NV16</constant>, a combined CbCr plane
21immediately follows the Y plane in memory. The CbCr plane is the same
22width and height, in bytes, as the Y plane (and of the image).
23Each CbCr pair belongs to two pixels. For example,
24Cb<subscript>0</subscript>/Cr<subscript>0</subscript> belongs to
25Y'<subscript>00</subscript>, Y'<subscript>01</subscript>.
26<constant>V4L2_PIX_FMT_NV61</constant> is the same except the Cb and
27Cr bytes are swapped, the CrCb plane starts with a Cr byte.</para>
28
29 <para>If the Y plane has pad bytes after each row, then the
30CbCr plane has as many pad bytes after its rows.</para>
31
32 <example>
33 <title><constant>V4L2_PIX_FMT_NV16</constant> 4 &times; 4
34pixel 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 <entry>Cr<subscript>00</subscript></entry>
75 <entry>Cb<subscript>01</subscript></entry>
76 <entry>Cr<subscript>01</subscript></entry>
77 </row>
78 <row>
79 <entry>start&nbsp;+&nbsp;20:</entry>
80 <entry>Cb<subscript>10</subscript></entry>
81 <entry>Cr<subscript>10</subscript></entry>
82 <entry>Cb<subscript>11</subscript></entry>
83 <entry>Cr<subscript>11</subscript></entry>
84 </row>
85 <row>
86 <entry>start&nbsp;+&nbsp;24:</entry>
87 <entry>Cb<subscript>20</subscript></entry>
88 <entry>Cr<subscript>20</subscript></entry>
89 <entry>Cb<subscript>21</subscript></entry>
90 <entry>Cr<subscript>21</subscript></entry>
91 </row>
92 <row>
93 <entry>start&nbsp;+&nbsp;28:</entry>
94 <entry>Cb<subscript>30</subscript></entry>
95 <entry>Cr<subscript>30</subscript></entry>
96 <entry>Cb<subscript>31</subscript></entry>
97 <entry>Cr<subscript>31</subscript></entry>
98 </row>
99 </tbody>
100 </tgroup>
101 </informaltable>
102 </para>
103 </formalpara>
104
105 <formalpara>
106 <title>Color Sample Location.</title>
107 <para>
108 <informaltable frame="none">
109 <tgroup cols="7" align="center">
110 <tbody valign="top">
111 <row>
112 <entry></entry>
113 <entry>0</entry><entry></entry><entry>1</entry><entry></entry>
114 <entry>2</entry><entry></entry><entry>3</entry>
115 </row>
116 <row>
117 <entry>0</entry>
118 <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
119 <entry>Y</entry><entry></entry><entry>Y</entry>
120 </row>
121 <row>
122 <entry></entry>
123 <entry></entry><entry>C</entry><entry></entry><entry></entry>
124 <entry></entry><entry>C</entry><entry></entry>
125 </row>
126 <row>
127 <entry>1</entry>
128 <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
129 <entry>Y</entry><entry></entry><entry>Y</entry>
130 </row>
131 <row>
132 <entry></entry>
133 <entry></entry><entry>C</entry><entry></entry><entry></entry>
134 <entry></entry><entry>C</entry><entry></entry>
135 </row>
136 <row>
137 <entry></entry>
138 </row>
139 <row>
140 <entry>2</entry>
141 <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
142 <entry>Y</entry><entry></entry><entry>Y</entry>
143 </row>
144 <row>
145 <entry></entry>
146 <entry></entry><entry>C</entry><entry></entry><entry></entry>
147 <entry></entry><entry>C</entry><entry></entry>
148 </row>
149 <row>
150 <entry>3</entry>
151 <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
152 <entry>Y</entry><entry></entry><entry>Y</entry>
153 </row>
154 <row>
155 <entry></entry>
156 <entry></entry><entry>C</entry><entry></entry><entry></entry>
157 <entry></entry><entry>C</entry><entry></entry>
158 </row>
159 </tbody>
160 </tgroup>
161 </informaltable>
162 </para>
163 </formalpara>
164 </example>
165 </refsect1>
166 </refentry>
167
168 <!--
169Local Variables:
170mode: sgml
171sgml-parent-document: "pixfmt.sgml"
172indent-tabs-mode: nil
173End:
174 -->