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8e080c2e MCC |
1 | <refentry> |
2 | <refmeta> | |
3 | <refentrytitle>V4L2_PIX_FMT_YVU410 ('YVU9'), V4L2_PIX_FMT_YUV410 ('YUV9')</refentrytitle> | |
4 | &manvol; | |
5 | </refmeta> | |
6 | <refnamediv> | |
7 | <refname id="V4L2-PIX-FMT-YVU410"><constant>V4L2_PIX_FMT_YVU410</constant></refname> | |
8 | <refname id="V4L2-PIX-FMT-YUV410"><constant>V4L2_PIX_FMT_YUV410</constant></refname> | |
9 | <refpurpose>Planar formats with ¼ horizontal and | |
10 | vertical chroma resolution, also known as YUV 4:1:0</refpurpose> | |
11 | </refnamediv> | |
12 | <refsect1> | |
13 | <title>Description</title> | |
14 | ||
15 | <para>These are planar formats, as opposed to a packed format. | |
16 | The three components are separated into three sub-images or planes. | |
17 | The Y plane is first. The Y plane has one byte per pixel. For | |
18 | <constant>V4L2_PIX_FMT_YVU410</constant>, the Cr plane immediately | |
19 | follows the Y plane in memory. The Cr plane is ¼ the width and | |
20 | ¼ the height of the Y plane (and of the image). Each Cr belongs | |
21 | to 16 pixels, a four-by-four square of the image. Following the Cr | |
22 | plane is the Cb plane, just like the Cr plane. | |
23 | <constant>V4L2_PIX_FMT_YUV410</constant> is the same, except the Cb | |
24 | plane comes first, then the Cr plane.</para> | |
25 | ||
26 | <para>If the Y plane has pad bytes after each row, then the Cr | |
27 | and Cb planes have ¼ as many pad bytes after their rows. In | |
28 | other words, four Cx rows (including padding) are exactly as long as | |
29 | one Y row (including padding).</para> | |
30 | ||
31 | <example> | |
32 | <title><constant>V4L2_PIX_FMT_YVU410</constant> 4 × 4 | |
33 | pixel image</title> | |
34 | ||
35 | <formalpara> | |
36 | <title>Byte Order.</title> | |
37 | <para>Each cell is one byte. | |
38 | <informaltable frame="none"> | |
39 | <tgroup cols="5" align="center"> | |
40 | <colspec align="left" colwidth="2*" /> | |
41 | <tbody valign="top"> | |
42 | <row> | |
43 | <entry>start + 0:</entry> | |
44 | <entry>Y'<subscript>00</subscript></entry> | |
45 | <entry>Y'<subscript>01</subscript></entry> | |
46 | <entry>Y'<subscript>02</subscript></entry> | |
47 | <entry>Y'<subscript>03</subscript></entry> | |
48 | </row> | |
49 | <row> | |
50 | <entry>start + 4:</entry> | |
51 | <entry>Y'<subscript>10</subscript></entry> | |
52 | <entry>Y'<subscript>11</subscript></entry> | |
53 | <entry>Y'<subscript>12</subscript></entry> | |
54 | <entry>Y'<subscript>13</subscript></entry> | |
55 | </row> | |
56 | <row> | |
57 | <entry>start + 8:</entry> | |
58 | <entry>Y'<subscript>20</subscript></entry> | |
59 | <entry>Y'<subscript>21</subscript></entry> | |
60 | <entry>Y'<subscript>22</subscript></entry> | |
61 | <entry>Y'<subscript>23</subscript></entry> | |
62 | </row> | |
63 | <row> | |
64 | <entry>start + 12:</entry> | |
65 | <entry>Y'<subscript>30</subscript></entry> | |
66 | <entry>Y'<subscript>31</subscript></entry> | |
67 | <entry>Y'<subscript>32</subscript></entry> | |
68 | <entry>Y'<subscript>33</subscript></entry> | |
69 | </row> | |
70 | <row> | |
71 | <entry>start + 16:</entry> | |
72 | <entry>Cr<subscript>00</subscript></entry> | |
73 | </row> | |
74 | <row> | |
75 | <entry>start + 17:</entry> | |
76 | <entry>Cb<subscript>00</subscript></entry> | |
77 | </row> | |
78 | </tbody> | |
79 | </tgroup> | |
80 | </informaltable> | |
81 | </para> | |
82 | </formalpara> | |
83 | ||
84 | <formalpara> | |
85 | <title>Color Sample Location.</title> | |
86 | <para> | |
87 | <informaltable frame="none"> | |
88 | <tgroup cols="7" align="center"> | |
89 | <tbody valign="top"> | |
90 | <row> | |
91 | <entry></entry> | |
92 | <entry>0</entry><entry></entry><entry>1</entry><entry></entry> | |
93 | <entry>2</entry><entry></entry><entry>3</entry> | |
94 | </row> | |
95 | <row> | |
96 | <entry>0</entry> | |
97 | <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> | |
98 | <entry>Y</entry><entry></entry><entry>Y</entry> | |
99 | </row> | |
100 | <row> | |
101 | <entry></entry> | |
102 | </row> | |
103 | <row> | |
104 | <entry>1</entry> | |
105 | <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> | |
106 | <entry>Y</entry><entry></entry><entry>Y</entry> | |
107 | </row> | |
108 | <row> | |
109 | <entry></entry> | |
110 | <entry></entry><entry></entry><entry></entry><entry>C</entry> | |
111 | <entry></entry><entry></entry><entry></entry> | |
112 | </row> | |
113 | <row> | |
114 | <entry>2</entry> | |
115 | <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> | |
116 | <entry>Y</entry><entry></entry><entry>Y</entry> | |
117 | </row> | |
118 | <row> | |
119 | <entry></entry> | |
120 | </row> | |
121 | <row> | |
122 | <entry>3</entry> | |
123 | <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> | |
124 | <entry>Y</entry><entry></entry><entry>Y</entry> | |
125 | </row> | |
126 | </tbody> | |
127 | </tgroup> | |
128 | </informaltable> | |
129 | </para> | |
130 | </formalpara> | |
131 | </example> | |
132 | </refsect1> | |
133 | </refentry> |