1 <refentry id="V4L2-PIX-FMT-YUV411P"> 2 <refmeta> 3 <refentrytitle>V4L2_PIX_FMT_YUV411P ('411P')</refentrytitle> 4 &manvol; 5 </refmeta> 6 <refnamediv> 7 <refname><constant>V4L2_PIX_FMT_YUV411P</constant></refname> 8 <refpurpose>Format with ¼ horizontal chroma resolution, 9also known as YUV 4:1:1. Planar layout as opposed to 10<constant>V4L2_PIX_FMT_Y41P</constant></refpurpose> 11 </refnamediv> 12 <refsect1> 13 <title>Description</title> 14 15 <para>This format is not commonly used. This is a planar 16format similar to the 4:2:2 planar format except with half as many 17chroma. The three components are separated into three sub-images or 18planes. The Y plane is first. The Y plane has one byte per pixel. The 19Cb plane immediately follows the Y plane in memory. The Cb plane is 20¼ the width of the Y plane (and of the image). Each Cb belongs 21to 4 pixels all on the same row. For example, 22Cb<subscript>0</subscript> belongs to Y'<subscript>00</subscript>, 23Y'<subscript>01</subscript>, Y'<subscript>02</subscript> and 24Y'<subscript>03</subscript>. Following the Cb plane is the Cr plane, 25just like the Cb plane.</para> 26 27 <para>If the Y plane has pad bytes after each row, then the Cr 28and Cb planes have ¼ as many pad bytes after their rows. In 29other words, four C x rows (including padding) is exactly as long as 30one Y row (including padding).</para> 31 32 <example> 33 <title><constant>V4L2_PIX_FMT_YUV411P</constant> 4 × 4 34pixel image</title> 35 36 <formalpara> 37 <title>Byte Order.</title> 38 <para>Each cell is one byte. 39 <informaltable frame="none"> 40 <tgroup cols="5" align="center"> 41 <colspec align="left" colwidth="2*" /> 42 <tbody valign="top"> 43 <row> 44 <entry>start + 0:</entry> 45 <entry>Y'<subscript>00</subscript></entry> 46 <entry>Y'<subscript>01</subscript></entry> 47 <entry>Y'<subscript>02</subscript></entry> 48 <entry>Y'<subscript>03</subscript></entry> 49 </row> 50 <row> 51 <entry>start + 4:</entry> 52 <entry>Y'<subscript>10</subscript></entry> 53 <entry>Y'<subscript>11</subscript></entry> 54 <entry>Y'<subscript>12</subscript></entry> 55 <entry>Y'<subscript>13</subscript></entry> 56 </row> 57 <row> 58 <entry>start + 8:</entry> 59 <entry>Y'<subscript>20</subscript></entry> 60 <entry>Y'<subscript>21</subscript></entry> 61 <entry>Y'<subscript>22</subscript></entry> 62 <entry>Y'<subscript>23</subscript></entry> 63 </row> 64 <row> 65 <entry>start + 12:</entry> 66 <entry>Y'<subscript>30</subscript></entry> 67 <entry>Y'<subscript>31</subscript></entry> 68 <entry>Y'<subscript>32</subscript></entry> 69 <entry>Y'<subscript>33</subscript></entry> 70 </row> 71 <row> 72 <entry>start + 16:</entry> 73 <entry>Cb<subscript>00</subscript></entry> 74 </row> 75 <row> 76 <entry>start + 17:</entry> 77 <entry>Cb<subscript>10</subscript></entry> 78 </row> 79 <row> 80 <entry>start + 18:</entry> 81 <entry>Cb<subscript>20</subscript></entry> 82 </row> 83 <row> 84 <entry>start + 19:</entry> 85 <entry>Cb<subscript>30</subscript></entry> 86 </row> 87 <row> 88 <entry>start + 20:</entry> 89 <entry>Cr<subscript>00</subscript></entry> 90 </row> 91 <row> 92 <entry>start + 21:</entry> 93 <entry>Cr<subscript>10</subscript></entry> 94 </row> 95 <row> 96 <entry>start + 22:</entry> 97 <entry>Cr<subscript>20</subscript></entry> 98 </row> 99 <row> 100 <entry>start + 23:</entry> 101 <entry>Cr<subscript>30</subscript></entry> 102 </row> 103 </tbody> 104 </tgroup> 105 </informaltable> 106 </para> 107 </formalpara> 108 109 <formalpara> 110 <title>Color Sample Location.</title> 111 <para> 112 <informaltable frame="none"> 113 <tgroup cols="7" align="center"> 114 <tbody valign="top"> 115 <row> 116 <entry></entry> 117 <entry>0</entry><entry></entry><entry>1</entry><entry></entry> 118 <entry>2</entry><entry></entry><entry>3</entry> 119 </row> 120 <row> 121 <entry>0</entry> 122 <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> 123 <entry>Y</entry><entry></entry><entry>Y</entry> 124 </row> 125 <row> 126 <entry>1</entry> 127 <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> 128 <entry>Y</entry><entry></entry><entry>Y</entry> 129 </row> 130 <row> 131 <entry>2</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> 139 </row> 140 </tbody> 141 </tgroup> 142 </informaltable> 143 </para> 144 </formalpara> 145 </example> 146 </refsect1> 147 </refentry> 148 149 <!-- 150Local Variables: 151mode: sgml 152sgml-parent-document: "v4l2.sgml" 153indent-tabs-mode: nil 154End: 155 --> 156