From: Hans Verkuil <hans.verk...@cisco.com>
In contrast to all other colorspaces, the BT.2020 colorspace uses
limited range R'G'B' quantization as the default.
This was incorrected documented, so fix this.
Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
---
Documentation/DocBook/media/v4l/pixfmt.xml | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/Documentation/DocBook/media/v4l/pixfmt.xml
b/Documentation/DocBook/media/v4l/pixfmt.xml
index f2175f0..56bdd24 100644
--- a/Documentation/DocBook/media/v4l/pixfmt.xml
+++ b/Documentation/DocBook/media/v4l/pixfmt.xml
@@ -483,8 +483,8 @@ is the Y'CbCr encoding identifier (&v4l2-ycbcr-encoding;)
to specify non-standar
Y'CbCr encodings and the third is the quantization identifier
(&v4l2-quantization;)
to specify non-standard quantization methods. Most of the time only the
colorspace
field of &v4l2-pix-format; or &v4l2-pix-format-mplane; needs to be filled in.
Note
-that the default R'G'B' quantization is always full range for all colorspaces,
-so this won't be mentioned explicitly for each colorspace description.</para>
+that the default R'G'B' quantization is full range for all colorspaces except
for
+BT.2020 which uses limited range R'G'B' quantization.</para>
<table pgwide="1" frame="none" id="v4l2-colorspace">
<title>V4L2 Colorspaces</title>
@@ -598,7 +598,8 @@ so this won't be mentioned explicitly for each colorspace
description.</para>
<row>
<entry><constant>V4L2_QUANTIZATION_DEFAULT</constant></entry>
<entry>Use the default quantization encoding as defined by the
colorspace.
-This is always full range for R'G'B' and usually limited range for
Y'CbCr.</entry>
+This is always full range for R'G'B' (except for the BT.2020 colorspace) and
usually
+limited range for Y'CbCr.</entry>
</row>
<row>
<entry><constant>V4L2_QUANTIZATION_FULL_RANGE</constant></entry>
@@ -967,8 +968,8 @@ SMPTE 170M/BT.601. The Y'CbCr quantization is limited
range.</para>
<title id="col-bt2020">Colorspace BT.2020
(<constant>V4L2_COLORSPACE_BT2020</constant>)</title>
<para>The <xref linkend="itu2020" /> standard defines the colorspace
used by Ultra-high definition
television (UHDTV). The default Y'CbCr encoding is
<constant>V4L2_YCBCR_ENC_BT2020</constant>.
-The default Y'CbCr quantization is limited range. The chromaticities of the
primary colors and
-the white reference are:</para>
+The default R'G'B' quantization is limited range (!), and so is the default
Y'CbCr quantization.
+The chromaticities of the primary colors and the white reference are:</para>
<table frame="none">
<title>BT.2020 Chromaticities</title>
<tgroup cols="3" align="left">
--
2.1.4
--
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