[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: Hans de Goede <hdegoede@redhat.com> [laurent.pinchart@ideasonboard.com: split into v4l/uvcvideo patches] [laurent.pinchart@ideasonboard.com: add documentation] Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans de Goede
Mauro Carvalho Chehab
Родитель
7296944759
Коммит
0e59fd0592
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@ -270,6 +270,7 @@
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<!ENTITY sub-write SYSTEM "v4l/func-write.xml">
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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-m420 SYSTEM "v4l/pixfmt-m420.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-nv12mt SYSTEM "v4l/pixfmt-nv12mt.xml">
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@ -0,0 +1,147 @@
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<refentry id="V4L2-PIX-FMT-M420">
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<refmeta>
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<refentrytitle>V4L2_PIX_FMT_M420 ('M420')</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_M420</constant></refname>
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<refpurpose>Format with ½ horizontal and vertical chroma
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resolution, also known as YUV 4:2:0. Hybrid plane line-interleaved
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layout.</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<para>M420 is a YUV format with ½ horizontal and vertical chroma
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subsampling (YUV 4:2:0). Pixels are organized as interleaved luma and
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chroma planes. Two lines of luma data are followed by one line of chroma
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data.</para>
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<para>The luma plane has one byte per pixel. The chroma plane contains
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interleaved CbCr pixels subsampled by ½ in the horizontal and
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vertical directions. 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>All line lengths are identical: if the Y lines include pad bytes
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so do the CbCr lines.</para>
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<example>
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<title><constant>V4L2_PIX_FMT_M420</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>start + 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>start + 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>start + 8:</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>start + 16:</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>start + 20:</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>start + 24:</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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@ -713,6 +713,7 @@ information.</para>
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&sub-nv12m;
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&sub-nv12mt;
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&sub-nv16;
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&sub-m420;
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</section>
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<section>
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@ -336,6 +336,7 @@ struct <link linkend="v4l2-pix-format">v4l2_pix_format</link> {
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#define <link linkend="V4L2-PIX-FMT-YUV420">V4L2_PIX_FMT_YUV420</link> v4l2_fourcc('Y', 'U', '1', '2') /* 12 YUV 4:2:0 */
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#define <link linkend="V4L2-PIX-FMT-HI240">V4L2_PIX_FMT_HI240</link> v4l2_fourcc('H', 'I', '2', '4') /* 8 8-bit color */
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#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 */
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#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 */
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/* two planes -- one Y, one Cr + Cb interleaved */
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#define <link linkend="V4L2-PIX-FMT-NV12">V4L2_PIX_FMT_NV12</link> v4l2_fourcc('N', 'V', '1', '2') /* 12 Y/CbCr 4:2:0 */
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@ -336,6 +336,7 @@ struct v4l2_pix_format {
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#define V4L2_PIX_FMT_YUV420 v4l2_fourcc('Y', 'U', '1', '2') /* 12 YUV 4:2:0 */
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#define V4L2_PIX_FMT_HI240 v4l2_fourcc('H', 'I', '2', '4') /* 8 8-bit color */
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#define V4L2_PIX_FMT_HM12 v4l2_fourcc('H', 'M', '1', '2') /* 8 YUV 4:2:0 16x16 macroblocks */
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#define V4L2_PIX_FMT_M420 v4l2_fourcc('M', '4', '2', '0') /* 12 YUV 4:2:0 2 lines y, 1 line uv interleaved */
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/* two planes -- one Y, one Cr + Cb interleaved */
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#define V4L2_PIX_FMT_NV12 v4l2_fourcc('N', 'V', '1', '2') /* 12 Y/CbCr 4:2:0 */
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