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Diffstat (limited to 'Documentation/DocBook/media/v4l/pixfmt-y12i.xml')
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diff --git a/Documentation/DocBook/media/v4l/pixfmt-y12i.xml b/Documentation/DocBook/media/v4l/pixfmt-y12i.xml new file mode 100644 index 000000000000..4a2d1e5f67e4 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-y12i.xml @@ -0,0 +1,49 @@ +<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> |