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authorHans Verkuil <hans.verkuil@cisco.com>2015-09-13 16:15:21 -0300
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-10-01 07:46:55 -0300
commit00507a8d6a86973e55076ea21053fd8e786391eb (patch)
tree04e7cad24cdf5293d0f3ef4e292432b3c425a6b4 /Documentation/DocBook
parentc732e647ba4b870216658a33bba14e36bdb1a73f (diff)
[media] DocBook media: Document the SMPTE 2084 transfer function
Document this new transfer function used by High Dynamic Range content. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'Documentation/DocBook')
-rw-r--r--Documentation/DocBook/media/v4l/biblio.xml9
-rw-r--r--Documentation/DocBook/media/v4l/pixfmt.xml39
2 files changed, 48 insertions, 0 deletions
diff --git a/Documentation/DocBook/media/v4l/biblio.xml b/Documentation/DocBook/media/v4l/biblio.xml
index f54db5992279..9beb30f0071b 100644
--- a/Documentation/DocBook/media/v4l/biblio.xml
+++ b/Documentation/DocBook/media/v4l/biblio.xml
@@ -186,6 +186,15 @@ Signal - NTSC for Studio Applications"</title>
<title>SMPTE RP 431-2:2011 "D-Cinema Quality - Reference Projector and Environment"</title>
</biblioentry>
+ <biblioentry id="smpte2084">
+ <abbrev>SMPTE&nbsp;ST&nbsp;2084</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 ST 2084:2014 "High Dynamic Range Electro-Optical Transfer Function of Master Reference Displays"</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 41733331af4c..70cd0fd02e12 100644
--- a/Documentation/DocBook/media/v4l/pixfmt.xml
+++ b/Documentation/DocBook/media/v4l/pixfmt.xml
@@ -609,6 +609,10 @@ colorspaces except for BT.2020 which uses limited range R'G'B' quantization.</pa
<entry><constant>V4L2_XFER_FUNC_DCI_P3</constant></entry>
<entry>Use the DCI-P3 transfer function.</entry>
</row>
+ <row>
+ <entry><constant>V4L2_XFER_FUNC_SMPTE2084</constant></entry>
+ <entry>Use the SMPTE 2084 transfer function.</entry>
+ </row>
</tbody>
</tgroup>
</table>
@@ -1472,6 +1476,41 @@ and <constant>V4L2_QUANTIZATION_FULL_RANGE</constant>.</para>
</section>
+ <section>
+ <title>Detailed Transfer Function Descriptions</title>
+ <section id="xf-smpte-2084">
+ <title>Transfer Function SMPTE 2084 (<constant>V4L2_XFER_FUNC_SMPTE2084</constant>)</title>
+ <para>The <xref linkend="smpte2084" /> standard defines the transfer function used by
+High Dynamic Range content.</para>
+ <variablelist>
+ <varlistentry>
+ <term>Constants:</term>
+ <listitem>
+ <para>m1 = (2610 / 4096) / 4</para>
+ <para>m2 = (2523 / 4096) * 128</para>
+ <para>c1 = 3424 / 4096</para>
+ <para>c2 = (2413 / 4096) * 32</para>
+ <para>c3 = (2392 / 4096) * 32</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>Transfer function:</term>
+ <listitem>
+ <para>L' = ((c1 + c2 * L<superscript>m1</superscript>) / (1 + c3 * L<superscript>m1</superscript>))<superscript>m2</superscript></para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ <variablelist>
+ <varlistentry>
+ <term>Inverse Transfer function:</term>
+ <listitem>
+ <para>L = (max(L'<superscript>1/m2</superscript> - c1, 0) / (c2 - c3 * L'<superscript>1/m2</superscript>))<superscript>1/m1</superscript></para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </section>
+ </section>
+
<section id="pixfmt-indexed">
<title>Indexed Format</title>