From: Hans de Goede <hdego...@redhat.com>
M420 is an hybrid YUV 4:2:2 packet/planar format. Two Y lines are
followed by an interleaved U/V line.
Signed-off-by: Hans de Goede <hdego...@redhat.com>
[laurent.pinch...@ideasonboard.com: split into v4l/uvcvideo patches]
[laurent.pinch...@ideasonboard.com: add documentation]
Signed-off-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
---
Documentation/DocBook/media-entities.tmpl | 1 +
Documentation/DocBook/v4l/pixfmt-m420.xml | 147 +++++++++++++++++++++++++++++
Documentation/DocBook/v4l/pixfmt.xml | 1 +
Documentation/DocBook/v4l/videodev2.h.xml | 1 +
include/linux/videodev2.h | 1 +
5 files changed, 151 insertions(+), 0 deletions(-)
create mode 100644 Documentation/DocBook/v4l/pixfmt-m420.xml
diff --git a/Documentation/DocBook/media-entities.tmpl
b/Documentation/DocBook/media-entities.tmpl
index 7a95708..c8abb23 100644
--- a/Documentation/DocBook/media-entities.tmpl
+++ b/Documentation/DocBook/media-entities.tmpl
@@ -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">
diff --git a/Documentation/DocBook/v4l/pixfmt-m420.xml
b/Documentation/DocBook/v4l/pixfmt-m420.xml
new file mode 100644
index 0000000..ce4bc01
--- /dev/null
+++ b/Documentation/DocBook/v4l/pixfmt-m420.xml
@@ -0,0 +1,147 @@
+ <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 ½ 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 ½ 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 ½ 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 × 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 + 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 + 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 + 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 + 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 + 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 + 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:
+ -->
diff --git a/Documentation/DocBook/v4l/pixfmt.xml
b/Documentation/DocBook/v4l/pixfmt.xml
index 3486a06..dbfe3b0 100644
--- a/Documentation/DocBook/v4l/pixfmt.xml
+++ b/Documentation/DocBook/v4l/pixfmt.xml
@@ -713,6 +713,7 @@ information.</para>
&sub-nv12m;
&sub-nv12mt;
&sub-nv16;
+ &sub-m420;
</section>
<section>
diff --git a/Documentation/DocBook/v4l/videodev2.h.xml
b/Documentation/DocBook/v4l/videodev2.h.xml
index 937acf5..c50536a 100644
--- a/Documentation/DocBook/v4l/videodev2.h.xml
+++ b/Documentation/DocBook/v4l/videodev2.h.xml
@@ -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 */
diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
index a417270..8a4c309 100644
--- a/include/linux/videodev2.h
+++ b/include/linux/videodev2.h
@@ -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 */
--
1.7.3.4
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