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1 <refentry> 2 <refmeta> 3 <refentrytitle>V4L2_PIX_FMT_YUV444M ('YM24'), V4L2_PIX_FMT_YVU444M ('YM42')</refentrytitle> 4 &manvol; 5 </refmeta> 6 <refnamediv> 7 <refname id="V4L2-PIX-FMT-YUV444M"><constant>V4L2_PIX_FMT_YUV444M</constant></refname> 8 <refname id="V4L2-PIX-FMT-YVU444M"><constant>V4L2_PIX_FMT_YVU444M</constant></refname> 9 <refpurpose>Planar formats with full horizontal resolution, also 10 known as YUV and YVU 4:4:4</refpurpose> 11 </refnamediv> 12 13 <refsect1> 14 <title>Description</title> 15 16 <para>This is a multi-planar format, as opposed to a packed format. 17 The three components are separated into three sub-images or planes.</para> 18 19 <para>The Y plane is first. The Y plane has one byte per pixel. 20 For <constant>V4L2_PIX_FMT_YUV444M</constant> the Cb data 21 constitutes the second plane which is the same width and height as the Y plane 22 (and as the image). The Cr data, just like the Cb plane, is in the third plane. 23 </para> 24 25 <para><constant>V4L2_PIX_FMT_YVU444M</constant> is the same except 26 the Cr data is stored in the second plane and the Cb data in the third plane. 27 </para> 28 <para>If the Y plane has pad bytes after each row, then the Cb 29 and Cr planes have the same number of pad bytes after their rows.</para> 30 31 <para><constant>V4L2_PIX_FMT_YUV444M</constant> and 32 <constant>V4L2_PIX_FMT_YUV444M</constant> are intended to be 33 used only in drivers and applications that support the multi-planar API, 34 described in <xref linkend="planar-apis"/>. </para> 35 36 <example> 37 <title><constant>V4L2_PIX_FMT_YUV444M</constant> 4 × 4 38 pixel image</title> 39 40 <formalpara> 41 <title>Byte Order.</title> 42 <para>Each cell is one byte. 43 <informaltable frame="none"> 44 <tgroup cols="5" align="center"> 45 <colspec align="left" colwidth="2*" /> 46 <tbody valign="top"> 47 <row> 48 <entry>start0 + 0:</entry> 49 <entry>Y'<subscript>00</subscript></entry> 50 <entry>Y'<subscript>01</subscript></entry> 51 <entry>Y'<subscript>02</subscript></entry> 52 <entry>Y'<subscript>03</subscript></entry> 53 </row> 54 <row> 55 <entry>start0 + 4:</entry> 56 <entry>Y'<subscript>10</subscript></entry> 57 <entry>Y'<subscript>11</subscript></entry> 58 <entry>Y'<subscript>12</subscript></entry> 59 <entry>Y'<subscript>13</subscript></entry> 60 </row> 61 <row> 62 <entry>start0 + 8:</entry> 63 <entry>Y'<subscript>20</subscript></entry> 64 <entry>Y'<subscript>21</subscript></entry> 65 <entry>Y'<subscript>22</subscript></entry> 66 <entry>Y'<subscript>23</subscript></entry> 67 </row> 68 <row> 69 <entry>start0 + 12:</entry> 70 <entry>Y'<subscript>30</subscript></entry> 71 <entry>Y'<subscript>31</subscript></entry> 72 <entry>Y'<subscript>32</subscript></entry> 73 <entry>Y'<subscript>33</subscript></entry> 74 </row> 75 <row><entry></entry></row> 76 <row> 77 <entry>start1 + 0:</entry> 78 <entry>Cb<subscript>00</subscript></entry> 79 <entry>Cb<subscript>01</subscript></entry> 80 <entry>Cb<subscript>02</subscript></entry> 81 <entry>Cb<subscript>03</subscript></entry> 82 </row> 83 <row> 84 <entry>start1 + 4:</entry> 85 <entry>Cb<subscript>10</subscript></entry> 86 <entry>Cb<subscript>11</subscript></entry> 87 <entry>Cb<subscript>12</subscript></entry> 88 <entry>Cb<subscript>13</subscript></entry> 89 </row> 90 <row> 91 <entry>start1 + 8:</entry> 92 <entry>Cb<subscript>20</subscript></entry> 93 <entry>Cb<subscript>21</subscript></entry> 94 <entry>Cb<subscript>22</subscript></entry> 95 <entry>Cb<subscript>23</subscript></entry> 96 </row> 97 <row> 98 <entry>start1 + 12:</entry> 99 <entry>Cb<subscript>20</subscript></entry> 100 <entry>Cb<subscript>21</subscript></entry> 101 <entry>Cb<subscript>32</subscript></entry> 102 <entry>Cb<subscript>33</subscript></entry> 103 </row> 104 <row><entry></entry></row> 105 <row> 106 <entry>start2 + 0:</entry> 107 <entry>Cr<subscript>00</subscript></entry> 108 <entry>Cr<subscript>01</subscript></entry> 109 <entry>Cr<subscript>02</subscript></entry> 110 <entry>Cr<subscript>03</subscript></entry> 111 </row> 112 <row> 113 <entry>start2 + 4:</entry> 114 <entry>Cr<subscript>10</subscript></entry> 115 <entry>Cr<subscript>11</subscript></entry> 116 <entry>Cr<subscript>12</subscript></entry> 117 <entry>Cr<subscript>13</subscript></entry> 118 </row> 119 <row> 120 <entry>start2 + 8:</entry> 121 <entry>Cr<subscript>20</subscript></entry> 122 <entry>Cr<subscript>21</subscript></entry> 123 <entry>Cr<subscript>22</subscript></entry> 124 <entry>Cr<subscript>23</subscript></entry> 125 </row> 126 <row> 127 <entry>start2 + 12:</entry> 128 <entry>Cr<subscript>30</subscript></entry> 129 <entry>Cr<subscript>31</subscript></entry> 130 <entry>Cr<subscript>32</subscript></entry> 131 <entry>Cr<subscript>33</subscript></entry> 132 </row> 133 </tbody> 134 </tgroup> 135 </informaltable> 136 </para> 137 </formalpara> 138 139 <formalpara> 140 <title>Color Sample Location.</title> 141 <para> 142 <informaltable frame="none"> 143 <tgroup cols="7" align="center"> 144 <tbody valign="top"> 145 <row> 146 <entry></entry> 147 <entry>0</entry><entry></entry><entry>1</entry><entry></entry> 148 <entry>2</entry><entry></entry><entry>3</entry> 149 </row> 150 <row> 151 <entry>0</entry> 152 <entry>YC</entry><entry></entry><entry>YC</entry><entry></entry> 153 <entry>YC</entry><entry></entry><entry>YC</entry> 154 </row> 155 <row> 156 <entry>1</entry> 157 <entry>YC</entry><entry></entry><entry>YC</entry><entry></entry> 158 <entry>YC</entry><entry></entry><entry>YC</entry> 159 </row> 160 <row> 161 <entry>2</entry> 162 <entry>YC</entry><entry></entry><entry>YC</entry><entry></entry> 163 <entry>YC</entry><entry></entry><entry>YC</entry> 164 </row> 165 <row> 166 <entry>3</entry> 167 <entry>YC</entry><entry></entry><entry>YC</entry><entry></entry> 168 <entry>YC</entry><entry></entry><entry>YC</entry> 169 </row> 170 </tbody> 171 </tgroup> 172 </informaltable> 173 </para> 174 </formalpara> 175 </example> 176 </refsect1> 177 </refentry>
