1 <refentry id="V4L2-PIX-FMT-YUYV"> 2 <refmeta> 3 <refentrytitle>V4L2_PIX_FMT_YUYV ('YUYV')</refentrytitle> 4 &manvol; 5 </refmeta> 6 <refnamediv> 7 <refname><constant>V4L2_PIX_FMT_YUYV</constant></refname> 8 <refpurpose>Packed format with ½ horizontal chroma 9resolution, also known as YUV 4:2:2</refpurpose> 10 </refnamediv> 11 <refsect1> 12 <title>Description</title> 13 14 <para>In this format each four bytes is two pixels. Each four 15bytes is two Y's, a Cb and a Cr. Each Y goes to one of the pixels, and 16the Cb and Cr belong to both pixels. As you can see, the Cr and Cb 17components have half the horizontal resolution of the Y component. 18<constant>V4L2_PIX_FMT_YUYV </constant> is known in the Windows 19environment as YUY2.</para> 20 21 <example> 22 <title><constant>V4L2_PIX_FMT_YUYV</constant> 4 × 4 23pixel image</title> 24 25 <formalpara> 26 <title>Byte Order.</title> 27 <para>Each cell is one byte. 28 <informaltable frame="none"> 29 <tgroup cols="9" align="center"> 30 <colspec align="left" colwidth="2*" /> 31 <tbody valign="top"> 32 <row> 33 <entry>start + 0:</entry> 34 <entry>Y'<subscript>00</subscript></entry> 35 <entry>Cb<subscript>00</subscript></entry> 36 <entry>Y'<subscript>01</subscript></entry> 37 <entry>Cr<subscript>00</subscript></entry> 38 <entry>Y'<subscript>02</subscript></entry> 39 <entry>Cb<subscript>01</subscript></entry> 40 <entry>Y'<subscript>03</subscript></entry> 41 <entry>Cr<subscript>01</subscript></entry> 42 </row> 43 <row> 44 <entry>start + 8:</entry> 45 <entry>Y'<subscript>10</subscript></entry> 46 <entry>Cb<subscript>10</subscript></entry> 47 <entry>Y'<subscript>11</subscript></entry> 48 <entry>Cr<subscript>10</subscript></entry> 49 <entry>Y'<subscript>12</subscript></entry> 50 <entry>Cb<subscript>11</subscript></entry> 51 <entry>Y'<subscript>13</subscript></entry> 52 <entry>Cr<subscript>11</subscript></entry> 53 </row> 54 <row> 55 <entry>start + 16:</entry> 56 <entry>Y'<subscript>20</subscript></entry> 57 <entry>Cb<subscript>20</subscript></entry> 58 <entry>Y'<subscript>21</subscript></entry> 59 <entry>Cr<subscript>20</subscript></entry> 60 <entry>Y'<subscript>22</subscript></entry> 61 <entry>Cb<subscript>21</subscript></entry> 62 <entry>Y'<subscript>23</subscript></entry> 63 <entry>Cr<subscript>21</subscript></entry> 64 </row> 65 <row> 66 <entry>start + 24:</entry> 67 <entry>Y'<subscript>30</subscript></entry> 68 <entry>Cb<subscript>30</subscript></entry> 69 <entry>Y'<subscript>31</subscript></entry> 70 <entry>Cr<subscript>30</subscript></entry> 71 <entry>Y'<subscript>32</subscript></entry> 72 <entry>Cb<subscript>31</subscript></entry> 73 <entry>Y'<subscript>33</subscript></entry> 74 <entry>Cr<subscript>31</subscript></entry> 75 </row> 76 </tbody> 77 </tgroup> 78 </informaltable> 79 </para> 80 </formalpara> 81 82 <formalpara> 83 <title>Color Sample Location.</title> 84 <para> 85 <informaltable frame="none"> 86 <tgroup cols="7" align="center"> 87 <tbody valign="top"> 88 <row> 89 <entry></entry> 90 <entry>0</entry><entry></entry><entry>1</entry><entry></entry> 91 <entry>2</entry><entry></entry><entry>3</entry> 92 </row> 93 <row> 94 <entry>0</entry> 95 <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> 96 <entry>Y</entry><entry>C</entry><entry>Y</entry> 97 </row> 98 <row> 99 <entry>1</entry> 100 <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> 101 <entry>Y</entry><entry>C</entry><entry>Y</entry> 102 </row> 103 <row> 104 <entry>2</entry> 105 <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> 106 <entry>Y</entry><entry>C</entry><entry>Y</entry> 107 </row> 108 <row> 109 <entry>3</entry> 110 <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> 111 <entry>Y</entry><entry>C</entry><entry>Y</entry> 112 </row> 113 </tbody> 114 </tgroup> 115 </informaltable> 116 </para> 117 </formalpara> 118 </example> 119 </refsect1> 120 </refentry> 121