Commit 0e59fd05 authored by Hans de Goede's avatar Hans de Goede Committed by Mauro Carvalho Chehab
Browse files

[media] v4l: Add M420 format definition 



M420 is a hybrid YUV 4:2:0 packet/planar format. Two Y lines are
followed by an interleaved U/V line.

Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
[laurent.pinchart@ideasonboard.com: split into v4l/uvcvideo patches]
[laurent.pinchart@ideasonboard.com: add documentation]
Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 72969447

Documentation/DocBook/media-entities.tmpl

+1 −0
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@@ -270,6 +270,7 @@ 
<!ENTITY sub-write SYSTEM "v4l/func-write.xml">

<!ENTITY sub-io SYSTEM "v4l/io.xml">

<!ENTITY sub-grey SYSTEM "v4l/pixfmt-grey.xml">

<!ENTITY sub-m420 SYSTEM "v4l/pixfmt-m420.xml">

<!ENTITY sub-nv12 SYSTEM "v4l/pixfmt-nv12.xml">

<!ENTITY sub-nv12m SYSTEM "v4l/pixfmt-nv12m.xml">

<!ENTITY sub-nv12mt SYSTEM "v4l/pixfmt-nv12mt.xml">

Documentation/DocBook/v4l/pixfmt-m420.xml

0 → 100644
+147 −0
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    <refentry id="V4L2-PIX-FMT-M420">

      <refmeta>

	<refentrytitle>V4L2_PIX_FMT_M420 ('M420')</refentrytitle>

	&manvol;

      </refmeta>

      <refnamediv>

	<refname><constant>V4L2_PIX_FMT_M420</constant></refname>

	<refpurpose>Format with &frac12; horizontal and vertical chroma

	resolution, also known as YUV 4:2:0. Hybrid plane line-interleaved

	layout.</refpurpose>

      </refnamediv>

      <refsect1>

	<title>Description</title>



	<para>M420 is a YUV format with &frac12; horizontal and vertical chroma

	subsampling (YUV 4:2:0). Pixels are organized as interleaved luma and

	chroma planes. Two lines of luma data are followed by one line of chroma

	data.</para>

	<para>The luma plane has one byte per pixel. The chroma plane contains

	interleaved CbCr pixels subsampled by &frac12; in the horizontal and

	vertical directions. Each CbCr pair belongs to four pixels. For example,

Cb<subscript>0</subscript>/Cr<subscript>0</subscript> belongs to

Y'<subscript>00</subscript>, Y'<subscript>01</subscript>,

Y'<subscript>10</subscript>, Y'<subscript>11</subscript>.</para>



	<para>All line lengths are identical: if the Y lines include pad bytes

	so do the CbCr lines.</para>



	<example>

	  <title><constant>V4L2_PIX_FMT_M420</constant> 4 &times; 4

pixel image</title>



	  <formalpara>

	    <title>Byte Order.</title>

	    <para>Each cell is one byte.

		<informaltable frame="none">

		<tgroup cols="5" align="center">

		  <colspec align="left" colwidth="2*" />

		  <tbody valign="top">

		    <row>

		      <entry>start&nbsp;+&nbsp;0:</entry>

		      <entry>Y'<subscript>00</subscript></entry>

		      <entry>Y'<subscript>01</subscript></entry>

		      <entry>Y'<subscript>02</subscript></entry>

		      <entry>Y'<subscript>03</subscript></entry>

		    </row>

		    <row>

		      <entry>start&nbsp;+&nbsp;4:</entry>

		      <entry>Y'<subscript>10</subscript></entry>

		      <entry>Y'<subscript>11</subscript></entry>

		      <entry>Y'<subscript>12</subscript></entry>

		      <entry>Y'<subscript>13</subscript></entry>

		    </row>

		    <row>

		      <entry>start&nbsp;+&nbsp;8:</entry>

		      <entry>Cb<subscript>00</subscript></entry>

		      <entry>Cr<subscript>00</subscript></entry>

		      <entry>Cb<subscript>01</subscript></entry>

		      <entry>Cr<subscript>01</subscript></entry>

		    </row>

		    <row>

		      <entry>start&nbsp;+&nbsp;16:</entry>

		      <entry>Y'<subscript>20</subscript></entry>

		      <entry>Y'<subscript>21</subscript></entry>

		      <entry>Y'<subscript>22</subscript></entry>

		      <entry>Y'<subscript>23</subscript></entry>

		    </row>

		    <row>

		      <entry>start&nbsp;+&nbsp;20:</entry>

		      <entry>Y'<subscript>30</subscript></entry>

		      <entry>Y'<subscript>31</subscript></entry>

		      <entry>Y'<subscript>32</subscript></entry>

		      <entry>Y'<subscript>33</subscript></entry>

		    </row>

		    <row>

		      <entry>start&nbsp;+&nbsp;24:</entry>

		      <entry>Cb<subscript>10</subscript></entry>

		      <entry>Cr<subscript>10</subscript></entry>

		      <entry>Cb<subscript>11</subscript></entry>

		      <entry>Cr<subscript>11</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></entry><entry>Y</entry><entry></entry>

		      <entry>Y</entry><entry></entry><entry>Y</entry>

		    </row>

		    <row>

		      <entry></entry>

		      <entry></entry><entry>C</entry><entry></entry><entry></entry>

		      <entry></entry><entry>C</entry><entry></entry>

		    </row>

		    <row>

		      <entry>1</entry>

		      <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>

		      <entry>Y</entry><entry></entry><entry>Y</entry>

		    </row>

		    <row>

		      <entry></entry>

		    </row>

		    <row>

		      <entry>2</entry>

		      <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>

		      <entry>Y</entry><entry></entry><entry>Y</entry>

		    </row>

		    <row>

		      <entry></entry>

		      <entry></entry><entry>C</entry><entry></entry><entry></entry>

		      <entry></entry><entry>C</entry><entry></entry>

		    </row>

		    <row>

		      <entry>3</entry>

		      <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry>

		      <entry>Y</entry><entry></entry><entry>Y</entry>

		    </row>

		  </tbody>

		</tgroup>

		</informaltable>

	      </para>

	  </formalpara>

	</example>

      </refsect1>

    </refentry>



  <!--

Local Variables:

mode: sgml

sgml-parent-document: "pixfmt.sgml"

indent-tabs-mode: nil

End:

  -->

Documentation/DocBook/v4l/pixfmt.xml

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@@ -713,6 +713,7 @@ information.</para> 
    &sub-nv12m;

    &sub-nv12mt;

    &sub-nv16;

    &sub-m420;

  </section>



  <section>

Documentation/DocBook/v4l/videodev2.h.xml

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@@ -336,6 +336,7 @@ struct <link linkend="v4l2-pix-format">v4l2_pix_format</link> { 
#define <link linkend="V4L2-PIX-FMT-YUV420">V4L2_PIX_FMT_YUV420</link>  v4l2_fourcc('Y', 'U', '1', '2') /* 12  YUV 4:2:0     */

#define <link linkend="V4L2-PIX-FMT-HI240">V4L2_PIX_FMT_HI240</link>   v4l2_fourcc('H', 'I', '2', '4') /*  8  8-bit color   */

#define <link linkend="V4L2-PIX-FMT-HM12">V4L2_PIX_FMT_HM12</link>    v4l2_fourcc('H', 'M', '1', '2') /*  8  YUV 4:2:0 16x16 macroblocks */

#define <link linkend="V4L2-PIX-FMT-M420">V4L2_PIX_FMT_M420</link>    v4l2_fourcc('M', '4', '2', '0') /* 12  YUV 4:2:0 2 lines y, 1 line uv interleaved */



/* two planes -- one Y, one Cr + Cb interleaved  */

#define <link linkend="V4L2-PIX-FMT-NV12">V4L2_PIX_FMT_NV12</link>    v4l2_fourcc('N', 'V', '1', '2') /* 12  Y/CbCr 4:2:0  */

include/linux/videodev2.h

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@@ -336,6 +336,7 @@ struct v4l2_pix_format { 
#define V4L2_PIX_FMT_YUV420  v4l2_fourcc('Y', 'U', '1', '2') /* 12  YUV 4:2:0     */

#define V4L2_PIX_FMT_HI240   v4l2_fourcc('H', 'I', '2', '4') /*  8  8-bit color   */

#define V4L2_PIX_FMT_HM12    v4l2_fourcc('H', 'M', '1', '2') /*  8  YUV 4:2:0 16x16 macroblocks */

#define V4L2_PIX_FMT_M420    v4l2_fourcc('M', '4', '2', '0') /* 12  YUV 4:2:0 2 lines y, 1 line uv interleaved */



/* two planes -- one Y, one Cr + Cb interleaved  */

#define V4L2_PIX_FMT_NV12    v4l2_fourcc('N', 'V', '1', '2') /* 12  Y/CbCr 4:2:0  */

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