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SubjectRe: [PATCH v5 09/17] media: uapi: HEVC: Define V4L2_CID_STATELESS_HEVC_SLICE_PARAMS as a dynamic array
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Le 08/04/2022 à 20:53, Nicolas Dufresne a écrit :
> Le jeudi 07 avril 2022 à 17:29 +0200, Benjamin Gaignard a écrit :
>> 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@collabora.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.
>> + *
> I'm not sure about this comment, but I'm sure you forgot:
>
>
> --- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> @@ -1505,6 +1505,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum
> v4l2_ctrl_type *type,
> break;
> case V4L2_CID_STATELESS_HEVC_SLICE_PARAMS:
> *type = V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS;
> + *flags |= V4L2_CTRL_FLAG_DYNAMIC_ARRAY;
> break;
> case V4L2_CID_STATELESS_HEVC_SCALING_MATRIX:
> *type = V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX;
>
> Also, in AV1 we have V4L2_AV1_MAX_TILE_COUNT, which can be used in cfg.dims,
> something the driver will actually set. We could have
>
> #define V4L2_HEVC_MAX_TILE_COUNT 600
>
> And drives can set:
>
> .dims = { V4L2_HEVC_MAX_TILE_COUNT },
>
> In the control config.

Ok that will be in v6

>
>> * @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)

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