171 lines
6.1 KiB
XML
171 lines
6.1 KiB
XML
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<refentry>
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<refmeta>
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<refentrytitle>V4L2_PIX_FMT_NV16M ('NM16'), V4L2_PIX_FMT_NV61M ('NM61')</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname id="V4L2-PIX-FMT-NV16M"><constant>V4L2_PIX_FMT_NV16M</constant></refname>
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<refname id="V4L2-PIX-FMT-NV61M"><constant>V4L2_PIX_FMT_NV61M</constant></refname>
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<refpurpose>Variation of <constant>V4L2_PIX_FMT_NV16</constant> and <constant>V4L2_PIX_FMT_NV61</constant> with planes
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non contiguous in memory. </refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<para>This is a multi-planar, two-plane version of the YUV 4:2:2 format.
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The three components are separated into two sub-images or planes.
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<constant>V4L2_PIX_FMT_NV16M</constant> differs from <constant>V4L2_PIX_FMT_NV16
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</constant> in that the two planes are non-contiguous in memory, i.e. the chroma
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plane does not necessarily immediately follow the luma plane.
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The luminance data occupies the first plane. The Y plane has one byte per pixel.
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In the second plane there is chrominance data with alternating chroma samples.
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The CbCr plane is the same width and height, in bytes, as the Y plane.
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Each CbCr pair belongs to two pixels. For example,
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Cb<subscript>0</subscript>/Cr<subscript>0</subscript> belongs to
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Y'<subscript>00</subscript>, Y'<subscript>01</subscript>.
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<constant>V4L2_PIX_FMT_NV61M</constant> is the same as <constant>V4L2_PIX_FMT_NV16M</constant>
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except the Cb and Cr bytes are swapped, the CrCb plane starts with a Cr byte.</para>
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<para><constant>V4L2_PIX_FMT_NV16M</constant> and
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<constant>V4L2_PIX_FMT_NV61M</constant> are intended to be used only in drivers
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and applications that support the multi-planar API, described in
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<xref linkend="planar-apis"/>. </para>
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<example>
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<title><constant>V4L2_PIX_FMT_NV16M</constant> 4 × 4 pixel image</title>
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<formalpara>
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<title>Byte Order.</title>
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<para>Each cell is one byte.
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<informaltable frame="none">
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<tgroup cols="5" align="center">
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<colspec align="left" colwidth="2*" />
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<tbody valign="top">
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<row>
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<entry>start0 + 0:</entry>
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<entry>Y'<subscript>00</subscript></entry>
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<entry>Y'<subscript>01</subscript></entry>
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<entry>Y'<subscript>02</subscript></entry>
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<entry>Y'<subscript>03</subscript></entry>
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</row>
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<row>
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<entry>start0 + 4:</entry>
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<entry>Y'<subscript>10</subscript></entry>
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<entry>Y'<subscript>11</subscript></entry>
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<entry>Y'<subscript>12</subscript></entry>
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<entry>Y'<subscript>13</subscript></entry>
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</row>
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<row>
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<entry>start0 + 8:</entry>
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<entry>Y'<subscript>20</subscript></entry>
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<entry>Y'<subscript>21</subscript></entry>
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<entry>Y'<subscript>22</subscript></entry>
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<entry>Y'<subscript>23</subscript></entry>
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</row>
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<row>
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<entry>start0 + 12:</entry>
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<entry>Y'<subscript>30</subscript></entry>
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<entry>Y'<subscript>31</subscript></entry>
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<entry>Y'<subscript>32</subscript></entry>
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<entry>Y'<subscript>33</subscript></entry>
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</row>
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<row>
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<entry></entry>
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</row>
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<row>
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<entry>start1 + 0:</entry>
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<entry>Cb<subscript>00</subscript></entry>
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<entry>Cr<subscript>00</subscript></entry>
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<entry>Cb<subscript>02</subscript></entry>
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<entry>Cr<subscript>02</subscript></entry>
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</row>
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<row>
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<entry>start1 + 4:</entry>
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<entry>Cb<subscript>10</subscript></entry>
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<entry>Cr<subscript>10</subscript></entry>
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<entry>Cb<subscript>12</subscript></entry>
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<entry>Cr<subscript>12</subscript></entry>
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</row>
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<row>
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<entry>start1 + 8:</entry>
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<entry>Cb<subscript>20</subscript></entry>
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<entry>Cr<subscript>20</subscript></entry>
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<entry>Cb<subscript>22</subscript></entry>
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<entry>Cr<subscript>22</subscript></entry>
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</row>
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<row>
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<entry>start1 + 12:</entry>
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<entry>Cb<subscript>30</subscript></entry>
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<entry>Cr<subscript>30</subscript></entry>
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<entry>Cb<subscript>32</subscript></entry>
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<entry>Cr<subscript>32</subscript></entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</para>
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</formalpara>
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<formalpara>
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<title>Color Sample Location.</title>
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<para>
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<informaltable frame="none">
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<tgroup cols="7" align="center">
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<tbody valign="top">
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<row>
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<entry></entry>
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<entry>0</entry><entry></entry><entry>1</entry><entry></entry>
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<entry>2</entry><entry></entry><entry>3</entry>
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</row>
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<row>
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<entry>0</entry>
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<entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
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<entry>Y</entry><entry></entry><entry>Y</entry>
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</row>
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<row>
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<entry></entry>
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<entry></entry><entry>C</entry><entry></entry><entry></entry>
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<entry></entry><entry>C</entry><entry></entry>
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</row>
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<row>
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<entry>1</entry>
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<entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
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<entry>Y</entry><entry></entry><entry>Y</entry>
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</row>
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<row>
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<entry></entry>
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<entry></entry><entry>C</entry><entry></entry><entry></entry>
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<entry></entry><entry>C</entry><entry></entry>
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</row>
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<row>
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<entry></entry>
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</row>
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<row>
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<entry>2</entry>
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<entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
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<entry>Y</entry><entry></entry><entry>Y</entry>
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</row>
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<row>
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<entry></entry>
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<entry></entry><entry>C</entry><entry></entry><entry></entry>
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<entry></entry><entry>C</entry><entry></entry>
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</row>
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<row>
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<entry>3</entry>
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<entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>
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<entry>Y</entry><entry></entry><entry>Y</entry>
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</row>
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<row>
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<entry></entry>
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<entry></entry><entry>C</entry><entry></entry><entry></entry>
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<entry></entry><entry>C</entry><entry></entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</para>
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</formalpara>
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</example>
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</refsect1>
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</refentry>
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