linux-kernel - [RFC v2 7/8] media: uapi: Add V4L2_CID_STATELESS_HEVC_ENTRY_POINT

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Message-Id: <20220215110103.241297-8-benjamin.gaignard@collabora.com>
Date:   Tue, 15 Feb 2022 12:01:02 +0100
From:   Benjamin Gaignard <benjamin.gaignard@...labora.com>
To:     mchehab@...nel.org, 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, hverkuil-cisco@...all.nl,
        jonas@...boo.se, nicolas@...fresne.ca
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        kernel@...labora.com, knaerzche@...il.com, jc@...esim.co.uk,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>
Subject: [RFC v2 7/8] media: uapi: Add V4L2_CID_STATELESS_HEVC_ENTRY_POINT_OFFSET control

The number of 'entry point offset' could be very variable.
Rather than use a large static array define a v4l2 dynamic array
of integer control.
The number of entry point offsets is reported by the elems field.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
---
version 2:
- Define a new CID for entry point offsets parameters
 .../userspace-api/media/v4l/ext-ctrls-codec.rst          | 9 +++++++++
 include/uapi/linux/v4l2-controls.h                       | 1 +
 2 files changed, 10 insertions(+)

diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
index c3ae97657fa7..679595e94643 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
@@ -3101,6 +3101,15 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
 
     \normalsize
 
+``V4L2_CID_STATELESS_HEVC_ENTRY_POINT_OFFSETS (integer)``
+    Specifies the i-th entry point offset in bytes and is represented by
+    offset_len_minus1 plus 1 bits.
+    This control is a dynamically sized array. The number of entry point
+    offsets is reported by the ``elems`` field.
+    This bitstream parameter is defined according to :ref:`hevc`.
+    They are described in section 7.4.7.1 "General slice segment header
+    semantics" of the specification.
+
 ``V4L2_CID_STATELESS_HEVC_SCALING_MATRIX (struct)``
     Specifies the HEVC scaling matrix parameters used for the scaling process
     for transform coefficients.
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index 27f5d272dc43..700e6cce958c 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -2314,6 +2314,7 @@ struct v4l2_ctrl_vp9_compressed_hdr {
 #define V4L2_CID_STATELESS_HEVC_DECODE_PARAMS	(V4L2_CID_CODEC_STATELESS_BASE + 404)
 #define V4L2_CID_STATELESS_HEVC_DECODE_MODE	(V4L2_CID_CODEC_STATELESS_BASE + 405)
 #define V4L2_CID_STATELESS_HEVC_START_CODE	(V4L2_CID_CODEC_STATELESS_BASE + 406)
+#define V4L2_CID_STATELESS_HEVC_ENTRY_POINT_OFFSET	(V4L2_CID_CODEC_STATELESS_BASE + 407)
 
 enum v4l2_stateless_hevc_decode_mode {
 	V4L2_STATELESS_HEVC_DECODE_MODE_SLICE_BASED,
-- 
2.32.0