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| author | Hans Verkuil <hans.verkuil@cisco.com> | 2015-09-13 22:15:21 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-10-01 13:46:55 +0300 |
| commit | 00507a8d6a86973e55076ea21053fd8e786391eb (patch) | |
| tree | 04e7cad24cdf5293d0f3ef4e292432b3c425a6b4 /Documentation/DocBook/media | |
| parent | c732e647ba4b870216658a33bba14e36bdb1a73f (diff) | |
| download | linux-00507a8d6a86973e55076ea21053fd8e786391eb.tar.xz | |
[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/media')
| -rw-r--r-- | Documentation/DocBook/media/v4l/biblio.xml | 9 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/pixfmt.xml | 39 |
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 ST 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> |