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

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Date:   Wed, 06 Apr 2022 16:36:17 -0400
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        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
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
Subject: Re: [PATCH v4 14/15] media: uapi: Change data_bit_offset definition

Le lundi 28 février 2022 à 15:08 +0100, Benjamin Gaignard a écrit :
> '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);

Did you mean the following instead ?

+	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;