linux-kernel - [PATCH v5 09/17] media: uapi: HEVC: Define V4L2_CID_STATELESS_HEVC_SLICE

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Message-Id: <20220407152940.738159-10-benjamin.gaignard@collabora.com>
Date:   Thu,  7 Apr 2022 17:29:32 +0200
From:   Benjamin Gaignard <benjamin.gaignard@...labora.com>
To:     mchehab@...nel.org, hverkuil@...all.nl,
        ezequiel@...guardiasur.com.ar, p.zabel@...gutronix.de,
        gregkh@...uxfoundation.org, mripard@...nel.org,
        paul.kocialkowski@...tlin.com, wens@...e.org,
        jernej.skrabec@...il.com, samuel@...lland.org,
        nicolas.dufresne@...labora.com
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        sebastian.fricke@...labora.com,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>
Subject: [PATCH v5 09/17] media: uapi: HEVC: Define V4L2_CID_STATELESS_HEVC_SLICE_PARAMS as a dynamic array

Make explicit that V4L2_CID_STATELESS_HEVC_SLICE_PARAMS control is
a dynamic array control type.
Some drivers may be able to receive multiple slices in one control
to improve decoding performance.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
---
 Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst | 2 ++
 include/media/hevc-ctrls.h                                | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
index 7fcc6c2bac4c..1aaf3b84b584 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
@@ -2964,6 +2964,8 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
     These bitstream parameters are defined according to :ref:`hevc`.
     They are described in section 7.4.7 "General slice segment header
     semantics" of the specification.
+    This control is a dynamically sized 1-dimensional array,
+    V4L2_CTRL_FLAG_DYNAMIC_ARRAY flag must be set when using it.
 
 .. c:type:: v4l2_ctrl_hevc_slice_params
 
diff --git a/include/media/hevc-ctrls.h b/include/media/hevc-ctrls.h
index 96a9b71d1def..28049e1a8a07 100644
--- a/include/media/hevc-ctrls.h
+++ b/include/media/hevc-ctrls.h
@@ -314,6 +314,9 @@ struct v4l2_hevc_pred_weight_table {
 /**
  * v4l2_ctrl_hevc_slice_params - HEVC slice parameters
  *
+ * This control is a dynamically sized 1-dimensional array,
+ * V4L2_CTRL_FLAG_DYNAMIC_ARRAY flag must be set when using it.
+ *
  * @bit_size: size (in bits) of the current slice data
  * @data_bit_offset: offset (in bits) to the video data in the current slice data
  * @nal_unit_type: specifies the coding type of the slice (B, P or I)
-- 
2.32.0