| <refentry id="V4L2-PIX-FMT-Y12I"> |
| <refmeta> |
| <refentrytitle>V4L2_PIX_FMT_Y12I ('Y12I')</refentrytitle> |
| &manvol; |
| </refmeta> |
| <refnamediv> |
| <refname><constant>V4L2_PIX_FMT_Y12I</constant></refname> |
| <refpurpose>Interleaved grey-scale image, e.g. from a stereo-pair</refpurpose> |
| </refnamediv> |
| <refsect1> |
| <title>Description</title> |
| |
| <para>This is a grey-scale image with a depth of 12 bits per pixel, but with |
| pixels from 2 sources interleaved and bit-packed. Each pixel is stored in a |
| 24-bit word in the little-endian order. On a little-endian machine these pixels |
| can be deinterlaced using</para> |
| |
| <para> |
| <programlisting> |
| __u8 *buf; |
| left0 = 0xfff & *(__u16 *)buf; |
| right0 = *(__u16 *)(buf + 1) >> 4; |
| </programlisting> |
| </para> |
| |
| <example> |
| <title><constant>V4L2_PIX_FMT_Y12I</constant> 2 pixel data stream taking 3 bytes</title> |
| |
| <formalpara> |
| <title>Bit-packed representation</title> |
| <para>pixels cross the byte boundary and have a ratio of 3 bytes for each |
| interleaved pixel. |
| <informaltable frame="all"> |
| <tgroup cols="3" align="center"> |
| <colspec align="left" colwidth="2*" /> |
| <tbody valign="top"> |
| <row> |
| <entry>Y'<subscript>0left[7:0]</subscript></entry> |
| <entry>Y'<subscript>0right[3:0]</subscript>Y'<subscript>0left[11:8]</subscript></entry> |
| <entry>Y'<subscript>0right[11:4]</subscript></entry> |
| </row> |
| </tbody> |
| </tgroup> |
| </informaltable> |
| </para> |
| </formalpara> |
| </example> |
| </refsect1> |
| </refentry> |
