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 10vertical 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. 16The three components are separated into three sub-images or planes. 17The Y plane is first. The Y plane has one byte per pixel. For 18<constant>V4L2_PIX_FMT_YVU410</constant>, the Cr plane immediately 19follows the Y plane in memory. The Cr plane is ¼ the width and 20¼ the height of the Y plane (and of the image). Each Cr belongs 21to 16 pixels, a four-by-four square of the image. Following the Cr 22plane is the Cb plane, just like the Cr plane. 23<constant>V4L2_PIX_FMT_YUV410</constant> is the same, except the Cb 24plane comes first, then the Cr plane.</para> 25 26 <para>If the Y plane has pad bytes after each row, then the Cr 27and Cb planes have ¼ as many pad bytes after their rows. In 28other words, four Cx rows (including padding) are exactly as long as 29one Y row (including padding).</para> 30 31 <example> 32 <title><constant>V4L2_PIX_FMT_YVU410</constant> 4 × 4 33pixel 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> 134 135 <!-- 136Local Variables: 137mode: sgml 138sgml-parent-document: "pixfmt.sgml" 139indent-tabs-mode: nil 140End: 141 --> 142