From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Document this colorspace.
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
Documentation/DocBook/media/v4l/biblio.xml | 9 ++++
Documentation/DocBook/media/v4l/pixfmt.xml | 70 ++++++++++++++++++++++++++++++
2 files changed, 79 insertions(+)
diff --git a/Documentation/DocBook/media/v4l/biblio.xml b/Documentation/DocBook/media/v4l/biblio.xml
index fdee6b3..f54db59 100644
--- a/Documentation/DocBook/media/v4l/biblio.xml
+++ b/Documentation/DocBook/media/v4l/biblio.xml
@@ -177,6 +177,15 @@ Signal - NTSC for Studio Applications"</title>
1125-Line High-Definition Production"</title>
</biblioentry>
+ <biblioentry id="smpte431">
+ <abbrev>SMPTE RP 431-2</abbrev>
+ <authorgroup>
+ <corpauthor>Society of Motion Picture and Television Engineers
+(<ulink url="http://www.smpte.org";>http://www.smpte.org</ulink>)</corpauthor>
+ </authorgroup>
+ <title>SMPTE RP 431-2:2011 "D-Cinema Quality - Reference Projector and Environment"</title>
+ </biblioentry>
+
<biblioentry id="srgb">
<abbrev>sRGB</abbrev>
<authorgroup>
diff --git a/Documentation/DocBook/media/v4l/pixfmt.xml b/Documentation/DocBook/media/v4l/pixfmt.xml
index 965ea91..4173333 100644
--- a/Documentation/DocBook/media/v4l/pixfmt.xml
+++ b/Documentation/DocBook/media/v4l/pixfmt.xml
@@ -540,6 +540,10 @@ colorspaces except for BT.2020 which uses limited range R'G'B' quantization.</pa
<entry>See <xref linkend="col-bt2020" />.</entry>
</row>
<row>
+ <entry><constant>V4L2_COLORSPACE_DCI_P3</constant></entry>
+ <entry>See <xref linkend="col-dcip3" />.</entry>
+ </row>
+ <row>
<entry><constant>V4L2_COLORSPACE_SMPTE240M</constant></entry>
<entry>See <xref linkend="col-smpte-240m" />.</entry>
</row>
@@ -601,6 +605,10 @@ colorspaces except for BT.2020 which uses limited range R'G'B' quantization.</pa
<entry><constant>V4L2_XFER_FUNC_NONE</constant></entry>
<entry>Do not use a transfer function (i.e. use linear RGB values).</entry>
</row>
+ <row>
+ <entry><constant>V4L2_XFER_FUNC_DCI_P3</constant></entry>
+ <entry>Use the DCI-P3 transfer function.</entry>
+ </row>
</tbody>
</tgroup>
</table>
@@ -1154,6 +1162,68 @@ clamped to the range [-0.5…0.5]. The Y'CbCr quantization is limited range
clamped to the range [-0.5…0.5]. The Yc'CbcCrc quantization is limited range.</para>
</section>
+ <section id="col-dcip3">
+ <title>Colorspace DCI-P3 (<constant>V4L2_COLORSPACE_DCI_P3</constant>)</title>
+ <para>The <xref linkend="smpte431" /> standard defines the colorspace used by cinema
+projectors that use the DCI-P3 colorspace.
+The default transfer function is <constant>V4L2_XFER_FUNC_DCI_P3</constant>.
+The default Y'CbCr encoding is <constant>V4L2_YCBCR_ENC_709</constant>. Note that this
+colorspace does not specify a Y'CbCr encoding since it is not meant to be encoded
+to Y'CbCr. So this default Y'CbCr encoding was picked because it is the HDTV
+encoding. The default Y'CbCr quantization is limited range. The chromaticities of
+the primary colors and the white reference are:</para>
+ <table frame="none">
+ <title>DCI-P3 Chromaticities</title>
+ <tgroup cols="3" align="left">
+ &cs-str;
+ <thead>
+ <row>
+ <entry>Color</entry>
+ <entry>x</entry>
+ <entry>y</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row>
+ <entry>Red</entry>
+ <entry>0.6800</entry>
+ <entry>0.3200</entry>
+ </row>
+ <row>
+ <entry>Green</entry>
+ <entry>0.2650</entry>
+ <entry>0.6900</entry>
+ </row>
+ <row>
+ <entry>Blue</entry>
+ <entry>0.1500</entry>
+ <entry>0.0600</entry>
+ </row>
+ <row>
+ <entry>White Reference</entry>
+ <entry>0.3140</entry>
+ <entry>0.3510</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+ <variablelist>
+ <varlistentry>
+ <term>Transfer function:</term>
+ <listitem>
+ <para>L' = L<superscript>1/2.6</superscript></para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Inverse Transfer function:</term>
+ <listitem>
+ <para>L = L'<superscript>2.6</superscript></para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ <para>Y'CbCr encoding is not specified. V4L2 defaults to Rec. 709.</para>
+ </section>
+
<section id="col-smpte-240m">
<title>Colorspace SMPTE 240M (<constant>V4L2_COLORSPACE_SMPTE240M</constant>)</title>
<para>The <xref linkend="smpte240m" /> standard was an interim standard used during
--
2.1.4
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