linux-kernel - [PATCH v4 4/5] docs: Document CLL and Mastering display colorimetry controls

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Date:   Wed, 20 Jan 2021 11:26:05 +0200
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Cc:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>
Subject: [PATCH v4 4/5] docs: Document CLL and Mastering display colorimetry controls

Document Content Light Level and Mastering Display v4l2 colorimetry
controls.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
---
 .../media/v4l/ext-ctrls-colorimetry.rst       | 71 +++++++++++++++++++
 .../media/videodev2.h.rst.exceptions          |  2 +
 2 files changed, 73 insertions(+)

diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-colorimetry.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-colorimetry.rst
index 6b0cd2054e84..e7e55323651f 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-colorimetry.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-colorimetry.rst
@@ -17,3 +17,74 @@ Colorimetry Control IDs
     The Colorimetry class descriptor. Calling
     :ref:`VIDIOC_QUERYCTRL` for this control will
     return a description of this control class.
+
+``V4L2_CID_COLORIMETRY_HDR10_CLL_INFO (struct)``
+    The Content Light Level defines upper bounds for the nominal target
+    brightness light level of the pictures.
+
+.. c:type:: v4l2_ctrl_hdr10_cll_info
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_ctrl_hdr10_cll_info
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 1 2
+
+    * - __u16
+      - ``max_content_light_level``
+      - The upper bound for the maximum light level among all individual
+        samples for the pictures of a coded video sequence, cd/m2. When
+        equal to 0 no such upper bound is present.
+    * - __u16
+      - ``max_pic_average_light_level``
+      - The upper bound for the maximum average light level among the
+        samples for any individual picture of a coded video sequence, cd/m2.
+        When equal to 0 no such upper bound is present.
+
+``V4L2_CID_COLORIMETRY_HDR10_MASTERING_DISPLAY (struct)``
+    The mastering display defines the colour volume (the colour primaries,
+    white point and luminance range) of a display considered to be the
+    mastering display for the current video content.
+
+.. c:type:: v4l2_ctrl_hdr10_mastering_display
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_ctrl_hdr10_mastering_display
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 1 2
+
+    * - __u16
+      - ``display_primaries_x[3]``
+      - Specifies the normalized x chromaticity coordinate of the colour
+        primary component c of the mastering display in increments of 0.00002.
+        For describing the mastering display that uses Red, Green and Blue
+        colour primaries, index value c equal to 0 corresponds to the Green
+        primary, c equal to 1 corresponds to Blue primary and c equal to 2
+        corresponds to the Red colour primary.
+    * - __u16
+      - ``display_primaries_y[3]``
+      - Specifies the normalized y chromaticity coordinate of the colour
+        primary component c of the mastering display in increments of 0.00002.
+        For describing the mastering display that uses Red, Green and Blue
+        colour primaries, index value c equal to 0 corresponds to the Green
+        primary, c equal to 1 corresponds to Blue primary and c equal to 2
+        corresponds to Red colour primary.
+    * - __u16
+      - ``white_point_x``
+      - Specifies the normalized x chromaticity coordinate of the white
+        point of the mastering display in increments of 0.00002.
+    * - __u16
+      - ``white_point_y``
+      - Specifies the normalized y chromaticity coordinate of the white
+        point of the mastering display in increments of 0.00002.
+    * - __u32
+      - ``max_luminance``
+      - Specifies the nominal maximum display luminance of the mastering
+        display in units of 0.0001 cd/m2.
+    * - __u32
+      - ``min_luminance``
+      - specifies the nominal minimum display luminance of the mastering
+        display in units of 0.0001 cd/m2.
diff --git a/Documentation/userspace-api/media/videodev2.h.rst.exceptions b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
index 0ed170c6e720..af4b8b87c5d7 100644
--- a/Documentation/userspace-api/media/videodev2.h.rst.exceptions
+++ b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
@@ -147,6 +147,8 @@ replace symbol V4L2_CTRL_TYPE_HEVC_PPS :c:type:`v4l2_ctrl_type`
 replace symbol V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS :c:type:`v4l2_ctrl_type`
 replace symbol V4L2_CTRL_TYPE_AREA :c:type:`v4l2_ctrl_type`
 replace symbol V4L2_CTRL_TYPE_FWHT_PARAMS :c:type:`v4l2_ctrl_type`
+replace symbol V4L2_CTRL_TYPE_HDR10_CLL_INFO :c:type:`v4l2_ctrl_hdr10_cll_info`
+replace symbol V4L2_CTRL_TYPE_HDR10_MASTERING_DISPLAY :c:type:`v4l2_ctrl_hdr10_mastering_display`
 
 # V4L2 capability defines
 replace define V4L2_CAP_VIDEO_CAPTURE device-capabilities
-- 
2.25.1