[media] v4l: Add DocBook documentation for YU12M, NV12M image formats
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Sylwester Nawrocki
Mauro Carvalho Chehab
Родитель
4a3c9b4f0d
Коммит
269da4027c
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@ -237,6 +237,7 @@
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<!ENTITY sub-io SYSTEM "v4l/io.xml">
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<!ENTITY sub-grey SYSTEM "v4l/pixfmt-grey.xml">
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<!ENTITY sub-nv12 SYSTEM "v4l/pixfmt-nv12.xml">
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<!ENTITY sub-nv12m SYSTEM "v4l/pixfmt-nv12m.xml">
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<!ENTITY sub-nv16 SYSTEM "v4l/pixfmt-nv16.xml">
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<!ENTITY sub-packed-rgb SYSTEM "v4l/pixfmt-packed-rgb.xml">
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<!ENTITY sub-packed-yuv SYSTEM "v4l/pixfmt-packed-yuv.xml">
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@ -251,6 +252,7 @@
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<!ENTITY sub-yuv410 SYSTEM "v4l/pixfmt-yuv410.xml">
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<!ENTITY sub-yuv411p SYSTEM "v4l/pixfmt-yuv411p.xml">
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<!ENTITY sub-yuv420 SYSTEM "v4l/pixfmt-yuv420.xml">
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<!ENTITY sub-yuv420m SYSTEM "v4l/pixfmt-yuv420m.xml">
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<!ENTITY sub-yuv422p SYSTEM "v4l/pixfmt-yuv422p.xml">
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<!ENTITY sub-yuyv SYSTEM "v4l/pixfmt-yuyv.xml">
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<!ENTITY sub-yvyu SYSTEM "v4l/pixfmt-yvyu.xml">
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@ -337,6 +339,7 @@
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<!ENTITY write SYSTEM "v4l/func-write.xml">
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<!ENTITY grey SYSTEM "v4l/pixfmt-grey.xml">
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<!ENTITY nv12 SYSTEM "v4l/pixfmt-nv12.xml">
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<!ENTITY nv12m SYSTEM "v4l/pixfmt-nv12m.xml">
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<!ENTITY nv16 SYSTEM "v4l/pixfmt-nv16.xml">
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<!ENTITY packed-rgb SYSTEM "v4l/pixfmt-packed-rgb.xml">
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<!ENTITY packed-yuv SYSTEM "v4l/pixfmt-packed-yuv.xml">
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@ -351,6 +354,7 @@
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<!ENTITY yuv410 SYSTEM "v4l/pixfmt-yuv410.xml">
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<!ENTITY yuv411p SYSTEM "v4l/pixfmt-yuv411p.xml">
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<!ENTITY yuv420 SYSTEM "v4l/pixfmt-yuv420.xml">
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<!ENTITY yuv420m SYSTEM "v4l/pixfmt-yuv420m.xml">
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<!ENTITY yuv422p SYSTEM "v4l/pixfmt-yuv422p.xml">
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<!ENTITY yuyv SYSTEM "v4l/pixfmt-yuyv.xml">
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<!ENTITY yvyu SYSTEM "v4l/pixfmt-yvyu.xml">
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@ -0,0 +1,154 @@
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<refentry id="V4L2-PIX-FMT-NV12M">
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<refmeta>
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<refentrytitle>V4L2_PIX_FMT_NV12M ('NV12M')</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname> <constant>V4L2_PIX_FMT_NV12M</constant></refname>
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<refpurpose>Variation of <constant>V4L2_PIX_FMT_NV12</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 4:2:0 format.
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The three components are separated into two sub-images or planes.
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<constant>V4L2_PIX_FMT_NV12M</constant> differs from <constant>V4L2_PIX_FMT_NV12
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</constant> in that the two planes are non-contiguous in memory, i.e. the chroma
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plane do not necessarily immediately follows 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 a chrominance data with alternating chroma samples.
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The CbCr plane is the same width, in bytes, as the Y plane (and of the image),
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but is half as tall in pixels. Each CbCr pair belongs to four 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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Y'<subscript>10</subscript>, Y'<subscript>11</subscript>. </para>
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<para><constant>V4L2_PIX_FMT_NV12M</constant> is intended to be
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used only in drivers and applications that support the multi-planar API,
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described in <xref linkend="planar-apis"/>. </para>
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<para>If the Y plane has pad bytes after each row, then the
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CbCr plane has as many pad bytes after its rows.</para>
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<example>
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<title><constant>V4L2_PIX_FMT_NV12M</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>01</subscript></entry>
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<entry>Cr<subscript>01</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>11</subscript></entry>
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<entry>Cr<subscript>11</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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</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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</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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<!--
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Local Variables:
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mode: sgml
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sgml-parent-document: "pixfmt.sgml"
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indent-tabs-mode: nil
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End:
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-->
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@ -0,0 +1,162 @@
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<refentry id="V4L2-PIX-FMT-YUV420M">
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<refmeta>
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<refentrytitle>V4L2_PIX_FMT_YUV420M ('YU12M')</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname> <constant>V4L2_PIX_FMT_YUV420M</constant></refname>
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<refpurpose>Variation of <constant>V4L2_PIX_FMT_YUV420</constant>
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with planes 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 format, as opposed to a packed format.
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The three components are separated into three sub- images or planes.
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The Y plane is first. The Y plane has one byte per pixel. The Cb data
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constitutes the second plane which is half the width and half
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the height of the Y plane (and of the image). Each Cb belongs to four
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pixels, a two-by-two square of the image. For example,
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Cb<subscript>0</subscript> belongs to Y'<subscript>00</subscript>,
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Y'<subscript>01</subscript>, Y'<subscript>10</subscript>, and
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Y'<subscript>11</subscript>. The Cr data, just like the Cb plane, is
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in the third plane. </para>
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<para>If the Y plane has pad bytes after each row, then the Cb
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and Cr planes have half as many pad bytes after their rows. In other
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words, two Cx rows (including padding) is exactly as long as one Y row
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(including padding).</para>
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<para><constant>V4L2_PIX_FMT_NV12M</constant> is intended to be
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used only in drivers and applications that support the multi-planar API,
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described in <xref linkend="planar-apis"/>. </para>
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<example>
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<title><constant>V4L2_PIX_FMT_YVU420M</constant> 4 × 4
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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><entry></entry></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>Cb<subscript>01</subscript></entry>
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</row>
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<row>
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<entry>start1 + 2:</entry>
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<entry>Cb<subscript>10</subscript></entry>
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<entry>Cb<subscript>11</subscript></entry>
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</row>
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<row><entry></entry></row>
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<row>
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<entry>start2 + 0:</entry>
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<entry>Cr<subscript>00</subscript></entry>
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<entry>Cr<subscript>01</subscript></entry>
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</row>
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<row>
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<entry>start2 + 2:</entry>
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<entry>Cr<subscript>10</subscript></entry>
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<entry>Cr<subscript>11</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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</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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</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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<!--
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Local Variables:
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mode: sgml
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sgml-parent-document: "pixfmt.sgml"
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indent-tabs-mode: nil
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End:
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-->
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@ -703,10 +703,12 @@ information.</para>
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&sub-vyuy;
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&sub-y41p;
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&sub-yuv420;
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&sub-yuv420m;
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&sub-yuv410;
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&sub-yuv422p;
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&sub-yuv411p;
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&sub-nv12;
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&sub-nv12m;
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&sub-nv16;
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</section>
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