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[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>
This commit is contained in:
Hans Verkuil 2015-09-13 16:15:21 -03:00 committed by Mauro Carvalho Chehab
parent c732e647ba
commit 00507a8d6a
2 changed files with 48 additions and 0 deletions
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9
Documentation/DocBook/media/v4l/biblio.xml
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@ -186,6 +186,15 @@ Signal - NTSC for Studio Applications"</title>
<title>SMPTE RP 431-2:2011 "D-Cinema Quality - Reference Projector and Environment"</title> <title>SMPTE RP 431-2:2011 "D-Cinema Quality - Reference Projector and Environment"</title>
</biblioentry> </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"> <biblioentry id="srgb">
<abbrev>sRGB</abbrev> <abbrev>sRGB</abbrev>
<authorgroup> <authorgroup>

39
Documentation/DocBook/media/v4l/pixfmt.xml
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@ -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><constant>V4L2_XFER_FUNC_DCI_P3</constant></entry>
<entry>Use the DCI-P3 transfer function.</entry> <entry>Use the DCI-P3 transfer function.</entry>
</row> </row>
<row>
<entry><constant>V4L2_XFER_FUNC_SMPTE2084</constant></entry>
<entry>Use the SMPTE 2084 transfer function.</entry>
</row>
</tbody> </tbody>
</tgroup> </tgroup>
</table> </table>
@ -1472,6 +1476,41 @@ and <constant>V4L2_QUANTIZATION_FULL_RANGE</constant>.</para>
</section> </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"> <section id="pixfmt-indexed">
<title>Indexed Format</title> <title>Indexed Format</title>