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| >Video for Linux Two API Specification: Revision 0.24</TH |
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| ><H1 |
| ><A |
| NAME="AEN4850" |
| ></A |
| >V4L2_PIX_FMT_YVU420 ('YV12'), V4L2_PIX_FMT_YUV420 ('YU12')</H1 |
| ><DIV |
| CLASS="REFNAMEDIV" |
| ><A |
| NAME="AEN4854" |
| ></A |
| ><H2 |
| >Name</H2 |
| ><CODE |
| CLASS="CONSTANT" |
| >V4L2_PIX_FMT_YVU420</CODE |
| >, <CODE |
| CLASS="CONSTANT" |
| >V4L2_PIX_FMT_YUV420</CODE |
| > -- Planar formats with ½ horizontal and |
| vertical chroma resolution, also known as YUV 4:2:0</DIV |
| ><DIV |
| CLASS="REFSECT1" |
| ><A |
| NAME="AEN4860" |
| ></A |
| ><H2 |
| >Description</H2 |
| ><P |
| >These are planar formats, as opposed to a packed format. |
| The three components are separated into three sub- images or planes. |
| The Y plane is first. The Y plane has one byte per pixel. For |
| <CODE |
| CLASS="CONSTANT" |
| >V4L2_PIX_FMT_YVU420</CODE |
| >, the Cr plane immediately |
| follows the Y plane in memory. The Cr plane is half the width and half |
| the height of the Y plane (and of the image). Each Cr belongs to four |
| pixels, a two-by-two square of the image. For example, |
| Cr<SUB |
| >0</SUB |
| > belongs to Y'<SUB |
| >00</SUB |
| >, |
| Y'<SUB |
| >01</SUB |
| >, Y'<SUB |
| >10</SUB |
| >, and |
| Y'<SUB |
| >11</SUB |
| >. Following the Cr plane is the Cb plane, |
| just like the Cr plane. <CODE |
| CLASS="CONSTANT" |
| >V4L2_PIX_FMT_YUV420</CODE |
| > is |
| the same except the Cb plane comes first, then the Cr plane.</P |
| ><P |
| >If the Y plane has pad bytes after each row, then the Cr |
| and Cb planes have half as many pad bytes after their rows. In other |
| words, two Cx rows (including padding) is exactly as long as one Y row |
| (including padding).</P |
| ><DIV |
| CLASS="EXAMPLE" |
| ><A |
| NAME="AEN4871" |
| ></A |
| ><P |
| ><B |
| >Example 2-1. <CODE |
| CLASS="CONSTANT" |
| >V4L2_PIX_FMT_YVU420</CODE |
| > 4 × 4 |
| pixel image</B |
| ></P |
| ><DIV |
| CLASS="FORMALPARA" |
| ><P |
| ><B |
| >Byte Order. </B |
| >Each cell is one byte. |
| <DIV |
| CLASS="INFORMALTABLE" |
| ><P |
| ></P |
| ><A |
| NAME="AEN4877" |
| ></A |
| ><TABLE |
| BORDER="0" |
| FRAME="void" |
| CLASS="CALSTABLE" |
| ><COL |
| WIDTH="2*" |
| ALIGN="LEFT"><COL><COL><COL><COL><TBODY |
| VALIGN="TOP" |
| ><TR |
| ><TD |
| >start + 0:</TD |
| ><TD |
| >Y'<SUB |
| >00</SUB |
| ></TD |
| ><TD |
| >Y'<SUB |
| >01</SUB |
| ></TD |
| ><TD |
| >Y'<SUB |
| >02</SUB |
| ></TD |
| ><TD |
| >Y'<SUB |
| >03</SUB |
| ></TD |
| ></TR |
| ><TR |
| ><TD |
| >start + 4:</TD |
| ><TD |
| >Y'<SUB |
| >10</SUB |
| ></TD |
| ><TD |
| >Y'<SUB |
| >11</SUB |
| ></TD |
| ><TD |
| >Y'<SUB |
| >12</SUB |
| ></TD |
| ><TD |
| >Y'<SUB |
| >13</SUB |
| ></TD |
| ></TR |
| ><TR |
| ><TD |
| >start + 8:</TD |
| ><TD |
| >Y'<SUB |
| >20</SUB |
| ></TD |
| ><TD |
| >Y'<SUB |
| >21</SUB |
| ></TD |
| ><TD |
| >Y'<SUB |
| >22</SUB |
| ></TD |
| ><TD |
| >Y'<SUB |
| >23</SUB |
| ></TD |
| ></TR |
| ><TR |
| ><TD |
| >start + 12:</TD |
| ><TD |
| >Y'<SUB |
| >30</SUB |
| ></TD |
| ><TD |
| >Y'<SUB |
| >31</SUB |
| ></TD |
| ><TD |
| >Y'<SUB |
| >32</SUB |
| ></TD |
| ><TD |
| >Y'<SUB |
| >33</SUB |
| ></TD |
| ></TR |
| ><TR |
| ><TD |
| >start + 16:</TD |
| ><TD |
| >Cr<SUB |
| >00</SUB |
| ></TD |
| ><TD |
| >Cr<SUB |
| >01</SUB |
| ></TD |
| ><TD |
| > </TD |
| ><TD |
| > </TD |
| ></TR |
| ><TR |
| ><TD |
| >start + 18:</TD |
| ><TD |
| >Cr<SUB |
| >10</SUB |
| ></TD |
| ><TD |
| >Cr<SUB |
| >11</SUB |
| ></TD |
| ><TD |
| > </TD |
| ><TD |
| > </TD |
| ></TR |
| ><TR |
| ><TD |
| >start + 20:</TD |
| ><TD |
| >Cb<SUB |
| >00</SUB |
| ></TD |
| ><TD |
| >Cb<SUB |
| >01</SUB |
| ></TD |
| ><TD |
| > </TD |
| ><TD |
| > </TD |
| ></TR |
| ><TR |
| ><TD |
| >start + 22:</TD |
| ><TD |
| >Cb<SUB |
| >10</SUB |
| ></TD |
| ><TD |
| >Cb<SUB |
| >11</SUB |
| ></TD |
| ><TD |
| > </TD |
| ><TD |
| > </TD |
| ></TR |
| ></TBODY |
| ></TABLE |
| ><P |
| ></P |
| ></DIV |
| > |
| </P |
| ></DIV |
| ><DIV |
| CLASS="FORMALPARA" |
| ><P |
| ><B |
| >Color Sample Location. </B |
| > <DIV |
| CLASS="INFORMALTABLE" |
| ><P |
| ></P |
| ><A |
| NAME="AEN4948" |
| ></A |
| ><TABLE |
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| ><TD |
| >0</TD |
| ><TD |
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| ><TD |
| >1</TD |
| ><TD |
| > </TD |
| ><TD |
| >2</TD |
| ><TD |
| > </TD |
| ><TD |
| >3</TD |
| ></TR |
| ><TR |
| ><TD |
| >0</TD |
| ><TD |
| >Y</TD |
| ><TD |
| > </TD |
| ><TD |
| >Y</TD |
| ><TD |
| > </TD |
| ><TD |
| >Y</TD |
| ><TD |
| > </TD |
| ><TD |
| >Y</TD |
| ></TR |
| ><TR |
| ><TD |
| > </TD |
| ><TD |
| > </TD |
| ><TD |
| >C</TD |
| ><TD |
| > </TD |
| ><TD |
| > </TD |
| ><TD |
| > </TD |
| ><TD |
| >C</TD |
| ><TD |
| > </TD |
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| ><TR |
| ><TD |
| >1</TD |
| ><TD |
| >Y</TD |
| ><TD |
| > </TD |
| ><TD |
| >Y</TD |
| ><TD |
| > </TD |
| ><TD |
| >Y</TD |
| ><TD |
| > </TD |
| ><TD |
| >Y</TD |
| ></TR |
| ><TR |
| ><TD |
| > </TD |
| ><TD |
| > </TD |
| ><TD |
| > </TD |
| ><TD |
| > </TD |
| ><TD |
| > </TD |
| ><TD |
| > </TD |
| ><TD |
| > </TD |
| ></TR |
| ><TR |
| ><TD |
| >2</TD |
| ><TD |
| >Y</TD |
| ><TD |
| > </TD |
| ><TD |
| >Y</TD |
| ><TD |
| > </TD |
| ><TD |
| >Y</TD |
| ><TD |
| > </TD |
| ><TD |
| >Y</TD |
| ></TR |
| ><TR |
| ><TD |
| > </TD |
| ><TD |
| > </TD |
| ><TD |
| >C</TD |
| ><TD |
| > </TD |
| ><TD |
| > </TD |
| ><TD |
| > </TD |
| ><TD |
| >C</TD |
| ><TD |
| > </TD |
| ></TR |
| ><TR |
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| >3</TD |
| ><TD |
| >Y</TD |
| ><TD |
| > </TD |
| ><TD |
| >Y</TD |
| ><TD |
| > </TD |
| ><TD |
| >Y</TD |
| ><TD |
| > </TD |
| ><TD |
| >Y</TD |
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