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1 <refentry id="V4L2-PIX-FMT-Y12I"> 2 <refmeta> 3 <refentrytitle>V4L2_PIX_FMT_Y12I ('Y12I')</refentrytitle> 4 &manvol; 5 </refmeta> 6 <refnamediv> 7 <refname><constant>V4L2_PIX_FMT_Y12I</constant></refname> 8 <refpurpose>Interleaved grey-scale image, e.g. from a stereo-pair</refpurpose> 9 </refnamediv> 10 <refsect1> 11 <title>Description</title> 12 13 <para>This is a grey-scale image with a depth of 12 bits per pixel, but with 14 pixels from 2 sources interleaved and bit-packed. Each pixel is stored in a 15 24-bit word in the little-endian order. On a little-endian machine these pixels 16 can be deinterlaced using</para> 17 18 <para> 19 <programlisting> 20 __u8 *buf; 21 left0 = 0xfff & *(__u16 *)buf; 22 right0 = *(__u16 *)(buf + 1) >> 4; 23 </programlisting> 24 </para> 25 26 <example> 27 <title><constant>V4L2_PIX_FMT_Y12I</constant> 2 pixel data stream taking 3 bytes</title> 28 29 <formalpara> 30 <title>Bit-packed representation</title> 31 <para>pixels cross the byte boundary and have a ratio of 3 bytes for each 32 interleaved pixel. 33 <informaltable frame="all"> 34 <tgroup cols="3" align="center"> 35 <colspec align="left" colwidth="2*" /> 36 <tbody valign="top"> 37 <row> 38 <entry>Y'<subscript>0left[7:0]</subscript></entry> 39 <entry>Y'<subscript>0right[3:0]</subscript>Y'<subscript>0left[11:8]</subscript></entry> 40 <entry>Y'<subscript>0right[11:4]</subscript></entry> 41 </row> 42 </tbody> 43 </tgroup> 44 </informaltable> 45 </para> 46 </formalpara> 47 </example> 48 </refsect1> 49 </refentry>
