Based on kernel version 3.0.4. Page generated on 2011-10-03 22:07 EST.
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 9 resolution, 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 15 bytes is two Y's, a Cb and a Cr. Each Y goes to one of the pixels, and 16 the Cb and Cr belong to both pixels. As you can see, the Cr and Cb 17 components have half the horizontal resolution of the Y component. 18 <constant>V4L2_PIX_FMT_YUYV </constant> is known in the Windows 19 environment as YUY2.</para> 20 21 <example> 22 <title><constant>V4L2_PIX_FMT_YUYV</constant> 4 × 4 23 pixel 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> 121 122 <!-- 123 Local Variables: 124 mode: sgml 125 sgml-parent-document: "pixfmt.sgml" 126 indent-tabs-mode: nil 127 End: 128 -->
