linux-kernel - [PATCH v4 14/15] media: uapi: Change data_bit

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Message-Id: <20220228140838.622021-15-benjamin.gaignard@collabora.com>
Date:   Mon, 28 Feb 2022 15:08:37 +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, 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: [PATCH v4 14/15] media: uapi: Change data_bit_offset definition

'F.7.3.6.1 General slice segment header syntax' section of HEVC
specification describes that a slice header always end byte aligned,
therefore we only need to provide the data offset in byte.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
---
 Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst | 4 ++--
 drivers/staging/media/sunxi/cedrus/cedrus_h265.c          | 2 +-
 include/media/hevc-ctrls.h                                | 4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
index 1aa2a7399e76..c8602c1e706e 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
@@ -2986,8 +2986,8 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
       - ``bit_size``
       - Size (in bits) of the current slice data.
     * - __u32
-      - ``data_bit_offset``
-      - Offset (in bits) to the video data in the current slice data.
+      - ``data_byte_offset``
+      - Offset (in bytes) to the video data in the current slice data.
     * - __u32
       - ``num_entry_point_offsets``
       - Specifies the number of entry point offset syntax elements in the slice header.
diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
index 8ab2d9c6f048..3e43b7cc2f57 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
@@ -405,7 +405,7 @@ static void cedrus_h265_setup(struct cedrus_ctx *ctx,
 	/* Initialize bitstream access. */
 	cedrus_write(dev, VE_DEC_H265_TRIGGER, VE_DEC_H265_TRIGGER_INIT_SWDEC);
 
-	cedrus_h265_skip_bits(dev, slice_params->data_bit_offset);
+	cedrus_h265_skip_bits(dev, slice_params->data_byte_offset / 8);
 
 	/* Bitstream parameters. */
 
diff --git a/include/media/hevc-ctrls.h b/include/media/hevc-ctrls.h
index c50205083573..51bdf38ea0c3 100644
--- a/include/media/hevc-ctrls.h
+++ b/include/media/hevc-ctrls.h
@@ -296,7 +296,7 @@ struct v4l2_hevc_pred_weight_table {
  * 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
+ * @data_byte_offset: offset (in bytes) to the video data in the current slice data
  * @num_entry_point_offsets: specifies the number of entry point offset syntax
  *			     elements in the slice header.
  * @nal_unit_type: specifies the coding type of the slice (B, P or I)
@@ -340,7 +340,7 @@ struct v4l2_hevc_pred_weight_table {
  */
 struct v4l2_ctrl_hevc_slice_params {
 	__u32	bit_size;
-	__u32	data_bit_offset;
+	__u32	data_byte_offset;
 	__u32	num_entry_point_offsets;
 	/* ISO/IEC 23008-2, ITU-T Rec. H.265: NAL unit header */
 	__u8	nal_unit_type;
-- 
2.32.0