[PATCH v4 14/15] media: uapi: Change data_bit_offset definition

Benjamin Gaignard
2022-02-28T14:26:15Z

'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@collabora.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