Re: [PATCH v1 1/2] media: hevc: Add scaling matrix control

[Ezequiel Garcia <ezequiel@collabora.com>]

On Thu, 2021-07-15 at 17:12 +0200, Benjamin Gaignard wrote:
> HEVC scaling lists are used for the scaling process for transform
> coefficients.
> V4L2_HEVC_SPS_FLAG_SCALING_LIST_ENABLED has to set when they are
> encoded in the bitstream.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>

The HEVC control structs have some holes that we should fix soon,
but the scaling matrix struct looks good, so I think we can merge this one.

Reviewed-by: Ezequiel Garcia <ezequiel@collabora.com>

Thanks,
Ezequiel

> ---
>  .../media/v4l/ext-ctrls-codec.rst             | 57 +++++++++++++++++++
>  .../media/v4l/vidioc-queryctrl.rst            |  6 ++
>  drivers/media/v4l2-core/v4l2-ctrls-core.c     |  6 ++
>  drivers/media/v4l2-core/v4l2-ctrls-defs.c     |  4 ++
>  include/media/hevc-ctrls.h                    | 11 ++++
>  5 files changed, 84 insertions(+)
> 
> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> index dc096a5562cd..ab3bda79b440 100644
> --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> @@ -3071,6 +3071,63 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
>  
>      \normalsize
>  
> +``V4L2_CID_MPEG_VIDEO_HEVC_SCALING_MATRIX (struct)``
> +    Specifies the HEVC scaling matrix parameters used for the scaling process
> +    for transform coefficients.
> +    These matrix and parameters are defined according to :ref:`hevc`.
> +    They are described in section 7.4.5 "Scaling list data semantics" of
> +    the specification.
> +
> +.. c:type:: v4l2_ctrl_hevc_scaling_matrix
> +
> +.. raw:: latex
> +
> +    \scriptsize
> +
> +.. tabularcolumns:: |p{5.4cm}|p{6.8cm}|p{5.1cm}|
> +
> +.. cssclass:: longtable
> +
> +.. flat-table:: struct v4l2_ctrl_hevc_scaling_matrix
> +    :header-rows:  0
> +    :stub-columns: 0
> +    :widths:       1 1 2
> +
> +    * - __u8
> +      - ``scaling_list_4x4[6][16]``
> +      - Scaling list is used for the scaling process for transform
> +        coefficients. The values on each scaling list are expected
> +        in raster scan order.
> +    * - __u8
> +      - ``scaling_list_8x8[6][64]``
> +      - Scaling list is used for the scaling process for transform
> +        coefficients. The values on each scaling list are expected
> +        in raster scan order.
> +    * - __u8
> +      - ``scaling_list_16x16[6][64]``
> +      - Scaling list is used for the scaling process for transform
> +        coefficients. The values on each scaling list are expected
> +        in raster scan order.
> +    * - __u8
> +      - ``scaling_list_32x32[2][64]``
> +      - Scaling list is used for the scaling process for transform
> +        coefficients. The values on each scaling list are expected
> +        in raster scan order.
> +    * - __u8
> +      - ``scaling_list_dc_coef_16x16[6]``
> +      - Scaling list is used for the scaling process for transform
> +        coefficients. The values on each scaling list are expected
> +        in raster scan order.
> +    * - __u8
> +      - ``scaling_list_dc_coef_32x32[2]``
> +      - Scaling list is used for the scaling process for transform
> +        coefficients. The values on each scaling list are expected
> +        in raster scan order.
> +
> +.. raw:: latex
> +
> +    \normalsize
> +
>  .. c:type:: v4l2_hevc_dpb_entry
>  
>  .. raw:: latex
> diff --git a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
> index f9ecf6276129..2f491c17dd5d 100644
> --- a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
> +++ b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
> @@ -495,6 +495,12 @@ See also the examples in :ref:`control`.
>        - n/a
>        - A struct :c:type:`v4l2_ctrl_hevc_slice_params`, containing HEVC
>         slice parameters for stateless video decoders.
> +    * - ``V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX``
> +      - n/a
> +      - n/a
> +      - n/a
> +      - A struct :c:type:`v4l2_ctrl_hevc_scaling_matrix`, containing HEVC
> +       scaling matrix for stateless video decoders.
>      * - ``V4L2_CTRL_TYPE_VP8_FRAME``
>        - n/a
>        - n/a
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls-core.c b/drivers/media/v4l2-core/v4l2-ctrls-core.c
> index c4b5082849b6..70adfc1b9c81 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls-core.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls-core.c
> @@ -687,6 +687,9 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
>  
>                 break;
>  
> +       case V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX:
> +               break;
> +
>         case V4L2_CTRL_TYPE_AREA:
>                 area = p;
>                 if (!area->width || !area->height)
> @@ -1240,6 +1243,9 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
>         case V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS:
>                 elem_size = sizeof(struct v4l2_ctrl_hevc_slice_params);
>                 break;
> +       case V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX:
> +               elem_size = sizeof(struct v4l2_ctrl_hevc_scaling_matrix);
> +               break;
>         case V4L2_CTRL_TYPE_HEVC_DECODE_PARAMS:
>                 elem_size = sizeof(struct v4l2_ctrl_hevc_decode_params);
>                 break;
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> index b6344bbf1e00..cb29c2a7fabe 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> @@ -996,6 +996,7 @@ const char *v4l2_ctrl_get_name(u32 id)
>         case V4L2_CID_MPEG_VIDEO_HEVC_SPS:                      return "HEVC Sequence Parameter Set";
>         case V4L2_CID_MPEG_VIDEO_HEVC_PPS:                      return "HEVC Picture Parameter Set";
>         case V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS:             return "HEVC Slice Parameters";
> +       case V4L2_CID_MPEG_VIDEO_HEVC_SCALING_MATRIX:           return "HEVC Scaling Matrix";
>         case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_PARAMS:            return "HEVC Decode Parameters";
>         case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE:              return "HEVC Decode Mode";
>         case V4L2_CID_MPEG_VIDEO_HEVC_START_CODE:               return "HEVC Start Code";
> @@ -1488,6 +1489,9 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
>         case V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS:
>                 *type = V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS;
>                 break;
> +       case V4L2_CID_MPEG_VIDEO_HEVC_SCALING_MATRIX:
> +               *type = V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX;
> +               break;
>         case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_PARAMS:
>                 *type = V4L2_CTRL_TYPE_HEVC_DECODE_PARAMS;
>                 break;
> diff --git a/include/media/hevc-ctrls.h b/include/media/hevc-ctrls.h
> index 781371bff2ad..ef63bc205756 100644
> --- a/include/media/hevc-ctrls.h
> +++ b/include/media/hevc-ctrls.h
> @@ -19,6 +19,7 @@
>  #define V4L2_CID_MPEG_VIDEO_HEVC_SPS           (V4L2_CID_CODEC_BASE + 1008)
>  #define V4L2_CID_MPEG_VIDEO_HEVC_PPS           (V4L2_CID_CODEC_BASE + 1009)
>  #define V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS  (V4L2_CID_CODEC_BASE + 1010)
> +#define V4L2_CID_MPEG_VIDEO_HEVC_SCALING_MATRIX        (V4L2_CID_CODEC_BASE + 1011)
>  #define V4L2_CID_MPEG_VIDEO_HEVC_DECODE_PARAMS (V4L2_CID_CODEC_BASE + 1012)
>  #define V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE   (V4L2_CID_CODEC_BASE + 1015)
>  #define V4L2_CID_MPEG_VIDEO_HEVC_START_CODE    (V4L2_CID_CODEC_BASE + 1016)
> @@ -27,6 +28,7 @@
>  #define V4L2_CTRL_TYPE_HEVC_SPS 0x0120
>  #define V4L2_CTRL_TYPE_HEVC_PPS 0x0121
>  #define V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS 0x0122
> +#define V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX 0x0123
>  #define V4L2_CTRL_TYPE_HEVC_DECODE_PARAMS 0x0124
>  
>  enum v4l2_mpeg_video_hevc_decode_mode {
> @@ -225,6 +227,15 @@ struct v4l2_ctrl_hevc_decode_params {
>         __u64   flags;
>  };
>  
> +struct v4l2_ctrl_hevc_scaling_matrix {
> +       __u8    scaling_list_4x4[6][16];
> +       __u8    scaling_list_8x8[6][64];
> +       __u8    scaling_list_16x16[6][64];
> +       __u8    scaling_list_32x32[2][64];
> +       __u8    scaling_list_dc_coef_16x16[6];
> +       __u8    scaling_list_dc_coef_32x32[2];
> +};
> +
>  /*  MPEG-class control IDs specific to the Hantro driver as defined by V4L2 */
>  #define V4L2_CID_CODEC_HANTRO_BASE                             (V4L2_CTRL_CLASS_CODEC | 0x1200)
>  /*

-- 
Kindly,
Ezequiel