| <refentry id="V4L2-PIX-FMT-YUYV"> |
| <refmeta> |
| <refentrytitle>V4L2_PIX_FMT_YUYV ('YUYV')</refentrytitle> |
| &manvol; |
| </refmeta> |
| <refnamediv> |
| <refname><constant>V4L2_PIX_FMT_YUYV</constant></refname> |
| <refpurpose>Packed format with ½ horizontal chroma |
| resolution, also known as YUV 4:2:2</refpurpose> |
| </refnamediv> |
| <refsect1> |
| <title>Description</title> |
| |
| <para>In this format each four bytes is two pixels. Each four |
| bytes is two Y's, a Cb and a Cr. Each Y goes to one of the pixels, and |
| the Cb and Cr belong to both pixels. As you can see, the Cr and Cb |
| components have half the horizontal resolution of the Y component. |
| <constant>V4L2_PIX_FMT_YUYV </constant> is known in the Windows |
| environment as YUY2.</para> |
| |
| <example> |
| <title><constant>V4L2_PIX_FMT_YUYV</constant> 4 × 4 |
| pixel image</title> |
| |
| <formalpara> |
| <title>Byte Order.</title> |
| <para>Each cell is one byte. |
| <informaltable frame="none"> |
| <tgroup cols="9" align="center"> |
| <colspec align="left" colwidth="2*" /> |
| <tbody valign="top"> |
| <row> |
| <entry>start + 0:</entry> |
| <entry>Y'<subscript>00</subscript></entry> |
| <entry>Cb<subscript>00</subscript></entry> |
| <entry>Y'<subscript>01</subscript></entry> |
| <entry>Cr<subscript>00</subscript></entry> |
| <entry>Y'<subscript>02</subscript></entry> |
| <entry>Cb<subscript>01</subscript></entry> |
| <entry>Y'<subscript>03</subscript></entry> |
| <entry>Cr<subscript>01</subscript></entry> |
| </row> |
| <row> |
| <entry>start + 8:</entry> |
| <entry>Y'<subscript>10</subscript></entry> |
| <entry>Cb<subscript>10</subscript></entry> |
| <entry>Y'<subscript>11</subscript></entry> |
| <entry>Cr<subscript>10</subscript></entry> |
| <entry>Y'<subscript>12</subscript></entry> |
| <entry>Cb<subscript>11</subscript></entry> |
| <entry>Y'<subscript>13</subscript></entry> |
| <entry>Cr<subscript>11</subscript></entry> |
| </row> |
| <row> |
| <entry>start + 16:</entry> |
| <entry>Y'<subscript>20</subscript></entry> |
| <entry>Cb<subscript>20</subscript></entry> |
| <entry>Y'<subscript>21</subscript></entry> |
| <entry>Cr<subscript>20</subscript></entry> |
| <entry>Y'<subscript>22</subscript></entry> |
| <entry>Cb<subscript>21</subscript></entry> |
| <entry>Y'<subscript>23</subscript></entry> |
| <entry>Cr<subscript>21</subscript></entry> |
| </row> |
| <row> |
| <entry>start + 24:</entry> |
| <entry>Y'<subscript>30</subscript></entry> |
| <entry>Cb<subscript>30</subscript></entry> |
| <entry>Y'<subscript>31</subscript></entry> |
| <entry>Cr<subscript>30</subscript></entry> |
| <entry>Y'<subscript>32</subscript></entry> |
| <entry>Cb<subscript>31</subscript></entry> |
| <entry>Y'<subscript>33</subscript></entry> |
| <entry>Cr<subscript>31</subscript></entry> |
| </row> |
| </tbody> |
| </tgroup> |
| </informaltable> |
| </para> |
| </formalpara> |
| |
| <formalpara> |
| <title>Color Sample Location.</title> |
| <para> |
| <informaltable frame="none"> |
| <tgroup cols="7" align="center"> |
| <tbody valign="top"> |
| <row> |
| <entry></entry> |
| <entry>0</entry><entry></entry><entry>1</entry><entry></entry> |
| <entry>2</entry><entry></entry><entry>3</entry> |
| </row> |
| <row> |
| <entry>0</entry> |
| <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> |
| <entry>Y</entry><entry>C</entry><entry>Y</entry> |
| </row> |
| <row> |
| <entry>1</entry> |
| <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> |
| <entry>Y</entry><entry>C</entry><entry>Y</entry> |
| </row> |
| <row> |
| <entry>2</entry> |
| <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> |
| <entry>Y</entry><entry>C</entry><entry>Y</entry> |
| </row> |
| <row> |
| <entry>3</entry> |
| <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> |
| <entry>Y</entry><entry>C</entry><entry>Y</entry> |
| </row> |
| </tbody> |
| </tgroup> |
| </informaltable> |
| </para> |
| </formalpara> |
| </example> |
| </refsect1> |
| </refentry> |
