1 <refentry id="V4L2-PIX-FMT-Y41P"> 2 <refmeta> 3 <refentrytitle>V4L2_PIX_FMT_Y41P ('Y41P')</refentrytitle> 4 &manvol; 5 </refmeta> 6 <refnamediv> 7 <refname><constant>V4L2_PIX_FMT_Y41P</constant></refname> 8 <refpurpose>Format with ¼ horizontal chroma 9resolution, also known as YUV 4:1:1</refpurpose> 10 </refnamediv> 11 <refsect1> 12 <title>Description</title> 13 14 <para>In this format each 12 bytes is eight pixels. In the 15twelve bytes are two CbCr pairs and eight Y's. The first CbCr pair 16goes with the first four Y's, and the second CbCr pair goes with the 17other four Y's. The Cb and Cr components have one fourth the 18horizontal resolution of the Y component.</para> 19 20 <para>Do not confuse this format with <link 21linkend="V4L2-PIX-FMT-YUV411P"><constant>V4L2_PIX_FMT_YUV411P</constant></link>. 22Y41P is derived from "YUV 4:1:1 <emphasis>packed</emphasis>", while 23YUV411P stands for "YUV 4:1:1 <emphasis>planar</emphasis>".</para> 24 25 <example> 26 <title><constant>V4L2_PIX_FMT_Y41P</constant> 8 × 4 27pixel image</title> 28 29 <formalpara> 30 <title>Byte Order</title> 31 <para>Each cell is one byte. 32 <informaltable frame="none"> 33 <tgroup cols="13" align="center"> 34 <colspec align="left" colwidth="2*" /> 35 <tbody valign="top"> 36 <row> 37 <entry>start + 0:</entry> 38 <entry>Cb<subscript>00</subscript></entry> 39 <entry>Y'<subscript>00</subscript></entry> 40 <entry>Cr<subscript>00</subscript></entry> 41 <entry>Y'<subscript>01</subscript></entry> 42 <entry>Cb<subscript>01</subscript></entry> 43 <entry>Y'<subscript>02</subscript></entry> 44 <entry>Cr<subscript>01</subscript></entry> 45 <entry>Y'<subscript>03</subscript></entry> 46 <entry>Y'<subscript>04</subscript></entry> 47 <entry>Y'<subscript>05</subscript></entry> 48 <entry>Y'<subscript>06</subscript></entry> 49 <entry>Y'<subscript>07</subscript></entry> 50 </row> 51 <row> 52 <entry>start + 12:</entry> 53 <entry>Cb<subscript>10</subscript></entry> 54 <entry>Y'<subscript>10</subscript></entry> 55 <entry>Cr<subscript>10</subscript></entry> 56 <entry>Y'<subscript>11</subscript></entry> 57 <entry>Cb<subscript>11</subscript></entry> 58 <entry>Y'<subscript>12</subscript></entry> 59 <entry>Cr<subscript>11</subscript></entry> 60 <entry>Y'<subscript>13</subscript></entry> 61 <entry>Y'<subscript>14</subscript></entry> 62 <entry>Y'<subscript>15</subscript></entry> 63 <entry>Y'<subscript>16</subscript></entry> 64 <entry>Y'<subscript>17</subscript></entry> 65 </row> 66 <row> 67 <entry>start + 24:</entry> 68 <entry>Cb<subscript>20</subscript></entry> 69 <entry>Y'<subscript>20</subscript></entry> 70 <entry>Cr<subscript>20</subscript></entry> 71 <entry>Y'<subscript>21</subscript></entry> 72 <entry>Cb<subscript>21</subscript></entry> 73 <entry>Y'<subscript>22</subscript></entry> 74 <entry>Cr<subscript>21</subscript></entry> 75 <entry>Y'<subscript>23</subscript></entry> 76 <entry>Y'<subscript>24</subscript></entry> 77 <entry>Y'<subscript>25</subscript></entry> 78 <entry>Y'<subscript>26</subscript></entry> 79 <entry>Y'<subscript>27</subscript></entry> 80 </row> 81 <row> 82 <entry>start + 36:</entry> 83 <entry>Cb<subscript>30</subscript></entry> 84 <entry>Y'<subscript>30</subscript></entry> 85 <entry>Cr<subscript>30</subscript></entry> 86 <entry>Y'<subscript>31</subscript></entry> 87 <entry>Cb<subscript>31</subscript></entry> 88 <entry>Y'<subscript>32</subscript></entry> 89 <entry>Cr<subscript>31</subscript></entry> 90 <entry>Y'<subscript>33</subscript></entry> 91 <entry>Y'<subscript>34</subscript></entry> 92 <entry>Y'<subscript>35</subscript></entry> 93 <entry>Y'<subscript>36</subscript></entry> 94 <entry>Y'<subscript>37</subscript></entry> 95 </row> 96 </tbody> 97 </tgroup> 98 </informaltable></para> 99 </formalpara> 100 101 <formalpara> 102 <title>Color Sample Location.</title> 103 <para> 104 <informaltable frame="none"> 105 <tgroup cols="15" align="center"> 106 <tbody valign="top"> 107 <row> 108 <entry></entry> 109 <entry>0</entry><entry></entry><entry>1</entry><entry></entry> 110 <entry>2</entry><entry></entry><entry>3</entry><entry></entry> 111 <entry>4</entry><entry></entry><entry>5</entry><entry></entry> 112 <entry>6</entry><entry></entry><entry>7</entry> 113 </row> 114 <row> 115 <entry>0</entry> 116 <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> 117 <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> 118 <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> 119 <entry>Y</entry><entry></entry><entry>Y</entry> 120 </row> 121 <row> 122 <entry>1</entry> 123 <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> 124 <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> 125 <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> 126 <entry>Y</entry><entry></entry><entry>Y</entry> 127 </row> 128 <row> 129 <entry>2</entry> 130 <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> 131 <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> 132 <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> 133 <entry>Y</entry><entry></entry><entry>Y</entry> 134 </row> 135 <row> 136 <entry>3</entry> 137 <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> 138 <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> 139 <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> 140 <entry>Y</entry><entry></entry><entry>Y</entry> 141 </row> 142 </tbody> 143 </tgroup> 144 </informaltable> 145 </para> 146 </formalpara> 147 </example> 148 </refsect1> 149 </refentry> 150