Re: [PATCH v2 1/6] media: v4l2_ctrl: Add region of interest rectangle control

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Hi Nicolas,

On Tue, May 17, 2022 at 4:02 AM Nicolas Dufresne <nicolas@xxxxxxxxxxxx> wrote:
>
> Hi,
>
> thanks for working on this, see my comments below ...
>
> Le lundi 16 mai 2022 à 23:04 +0900, Yunke Cao a écrit :
> > Including:
> > 1. Add a control ID.
> > 2. Add p_rect to struct v4l2_ext_control with basic support in
> >    v4l2-ctrls.
> >
> > Signed-off-by: Yunke Cao <yunkec@xxxxxxxxxx>
> > ---
> >  .../media/v4l/ext-ctrls-camera.rst            |  4 ++++
> >  .../media/v4l/vidioc-g-ext-ctrls.rst          |  4 ++++
> >  .../media/videodev2.h.rst.exceptions          |  1 +
> >  drivers/media/v4l2-core/v4l2-ctrls-core.c     | 20 +++++++++++++++++++
> >  drivers/media/v4l2-core/v4l2-ctrls-defs.c     |  4 ++++
> >  include/media/v4l2-ctrls.h                    |  2 ++
> >  include/uapi/linux/v4l2-controls.h            |  2 ++
> >  include/uapi/linux/videodev2.h                |  2 ++
> >  8 files changed, 39 insertions(+)
> >
> > diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-camera.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-camera.rst
> > index 4c5061aa9cd4..86a1f09a8a1c 100644
> > --- a/Documentation/userspace-api/media/v4l/ext-ctrls-camera.rst
> > +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-camera.rst
> > @@ -661,3 +661,7 @@ enum v4l2_scene_mode -
> >  .. [#f1]
> >     This control may be changed to a menu control in the future, if more
> >     options are required.
> > +
> > +``V4L2_CID_REGION_OF_INTEREST_RECT (struct)``
> > +    This control determines the region of interest. Region of interest is an
> > +    rectangular area represented by a struct v4l2_rect.
>
> This control documentation is missing some important information. Notably, what
> will happen if this rectangle is set ? Is there a value to unset it ?
>

Thanks for the review!

In V4L2 all the controls are always set to something. There is no way
to unset a control. Since controls have default values, perhaps the
way to "unset" (or rather reset it to the initial configuration) is to
set it to the default value?

> The name is very generic and I would expect that to be usable in general. But it
> won't work for encoders, as you only allow 1 rectangle and it would be missing
> some QP delta parameter. I think I would prefer if we specialize this type of
> control a bit more. In your case, I'm guessing you only care about 1 ROI when
> taking a picture, and this ROI will be used for automatic focus. If my guess is
> right, perhaps a FOCUS_AERA could be a better name ?

I wonder if an array control is what we need here to make it flexible
enough? For a UVC camera obviously we would only need 1 element, but
other devices could accept more.

Best regards,
Tomasz

>
> regards,
> Nicolas
>
> > diff --git a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
> > index 29971a45a2d4..f4e205ead0a2 100644
> > --- a/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
> > +++ b/Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst
> > @@ -189,6 +189,10 @@ still cause this situation.
> >        - ``p_area``
> >        - A pointer to a struct :c:type:`v4l2_area`. Valid if this control is
> >          of type ``V4L2_CTRL_TYPE_AREA``.
> > +    * - struct :c:type:`v4l2_rect` *
> > +      - ``p_area``
> > +      - A pointer to a struct :c:type:`v4l2_rect`. Valid if this control is
> > +        of type ``V4L2_CTRL_TYPE_RECT``.
> >      * - struct :c:type:`v4l2_ctrl_h264_sps` *
> >        - ``p_h264_sps``
> >        - A pointer to a struct :c:type:`v4l2_ctrl_h264_sps`. Valid if this control is
> > diff --git a/Documentation/userspace-api/media/videodev2.h.rst.exceptions b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
> > index 9cbb7a0c354a..7b423475281d 100644
> > --- a/Documentation/userspace-api/media/videodev2.h.rst.exceptions
> > +++ b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
> > @@ -147,6 +147,7 @@ replace symbol V4L2_CTRL_TYPE_HEVC_SPS :c:type:`v4l2_ctrl_type`
> >  replace symbol V4L2_CTRL_TYPE_HEVC_PPS :c:type:`v4l2_ctrl_type`
> >  replace symbol V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS :c:type:`v4l2_ctrl_type`
> >  replace symbol V4L2_CTRL_TYPE_AREA :c:type:`v4l2_ctrl_type`
> > +replace symbol V4L2_CTRL_TYPE_RECT :c:type:`v4l2_ctrl_type`
> >  replace symbol V4L2_CTRL_TYPE_FWHT_PARAMS :c:type:`v4l2_ctrl_type`
> >  replace symbol V4L2_CTRL_TYPE_VP8_FRAME :c:type:`v4l2_ctrl_type`
> >  replace symbol V4L2_CTRL_TYPE_VP9_COMPRESSED_HDR :c:type:`v4l2_ctrl_type`
> > diff --git a/drivers/media/v4l2-core/v4l2-ctrls-core.c b/drivers/media/v4l2-core/v4l2-ctrls-core.c
> > index 8968cec8454e..dcde405c2713 100644
> > --- a/drivers/media/v4l2-core/v4l2-ctrls-core.c
> > +++ b/drivers/media/v4l2-core/v4l2-ctrls-core.c
> > @@ -84,6 +84,11 @@ static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
> >               return ptr1.p_u16[idx] == ptr2.p_u16[idx];
> >       case V4L2_CTRL_TYPE_U32:
> >               return ptr1.p_u32[idx] == ptr2.p_u32[idx];
> > +     case V4L2_CTRL_TYPE_RECT:
> > +             return ptr1.p_rect->top == ptr2.p_rect->top &&
> > +                    ptr1.p_rect->left == ptr2.p_rect->left &&
> > +                    ptr1.p_rect->height == ptr2.p_rect->height &&
> > +                    ptr1.p_rect->width == ptr2.p_rect->width;
> >       default:
> >               if (ctrl->is_int)
> >                       return ptr1.p_s32[idx] == ptr2.p_s32[idx];
> > @@ -307,6 +312,11 @@ static void std_log(const struct v4l2_ctrl *ctrl)
> >       case V4L2_CTRL_TYPE_VP9_FRAME:
> >               pr_cont("VP9_FRAME");
> >               break;
> > +     case V4L2_CTRL_TYPE_RECT:
> > +             pr_cont("l: %d, t: %d, w: %u, h: %u",
> > +                     ptr.p_rect->left, ptr.p_rect->top,
> > +                     ptr.p_rect->width, ptr.p_rect->height);
> > +             break;
> >       default:
> >               pr_cont("unknown type %d", ctrl->type);
> >               break;
> > @@ -525,6 +535,7 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> >       struct v4l2_ctrl_hdr10_mastering_display *p_hdr10_mastering;
> >       struct v4l2_ctrl_hevc_decode_params *p_hevc_decode_params;
> >       struct v4l2_area *area;
> > +     struct v4l2_rect *rect;
> >       void *p = ptr.p + idx * ctrl->elem_size;
> >       unsigned int i;
> >
> > @@ -888,6 +899,12 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> >                       return -EINVAL;
> >               break;
> >
> > +     case V4L2_CTRL_TYPE_RECT:
> > +             rect = p;
> > +             if (!rect->width || !rect->height)
> > +                     return -EINVAL;
> > +             break;
> > +
> >       default:
> >               return -EINVAL;
> >       }
> > @@ -1456,6 +1473,9 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
> >       case V4L2_CTRL_TYPE_AREA:
> >               elem_size = sizeof(struct v4l2_area);
> >               break;
> > +     case V4L2_CTRL_TYPE_RECT:
> > +             elem_size = sizeof(struct v4l2_rect);
> > +             break;
> >       default:
> >               if (type < V4L2_CTRL_COMPOUND_TYPES)
> >                       elem_size = sizeof(s32);
> > diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> > index 54ca4e6b820b..95f39a2d2ad2 100644
> > --- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> > +++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> > @@ -1042,6 +1042,7 @@ const char *v4l2_ctrl_get_name(u32 id)
> >       case V4L2_CID_UNIT_CELL_SIZE:           return "Unit Cell Size";
> >       case V4L2_CID_CAMERA_ORIENTATION:       return "Camera Orientation";
> >       case V4L2_CID_CAMERA_SENSOR_ROTATION:   return "Camera Sensor Rotation";
> > +     case V4L2_CID_REGION_OF_INTEREST_RECT:  return "Region Of Interest Rectangle";
> >
> >       /* FM Radio Modulator controls */
> >       /* Keep the order of the 'case's the same as in v4l2-controls.h! */
> > @@ -1524,6 +1525,9 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
> >       case V4L2_CID_COLORIMETRY_HDR10_MASTERING_DISPLAY:
> >               *type = V4L2_CTRL_TYPE_HDR10_MASTERING_DISPLAY;
> >               break;
> > +     case V4L2_CID_REGION_OF_INTEREST_RECT:
> > +             *type = V4L2_CTRL_TYPE_RECT;
> > +             break;
> >       default:
> >               *type = V4L2_CTRL_TYPE_INTEGER;
> >               break;
> > diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
> > index b3ce438f1329..919e104de50b 100644
> > --- a/include/media/v4l2-ctrls.h
> > +++ b/include/media/v4l2-ctrls.h
> > @@ -58,6 +58,7 @@ struct video_device;
> >   * @p_hdr10_cll:             Pointer to an HDR10 Content Light Level structure.
> >   * @p_hdr10_mastering:               Pointer to an HDR10 Mastering Display structure.
> >   * @p_area:                  Pointer to an area.
> > + * @p_rect:                  Pointer to a rectangle.
> >   * @p:                               Pointer to a compound value.
> >   * @p_const:                 Pointer to a constant compound value.
> >   */
> > @@ -87,6 +88,7 @@ union v4l2_ctrl_ptr {
> >       struct v4l2_ctrl_hdr10_cll_info *p_hdr10_cll;
> >       struct v4l2_ctrl_hdr10_mastering_display *p_hdr10_mastering;
> >       struct v4l2_area *p_area;
> > +     struct v4l2_rect *p_rect;
> >       void *p;
> >       const void *p_const;
> >  };
> > diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> > index bb40129446d4..499fcddb6254 100644
> > --- a/include/uapi/linux/v4l2-controls.h
> > +++ b/include/uapi/linux/v4l2-controls.h
> > @@ -1008,6 +1008,8 @@ enum v4l2_auto_focus_range {
> >
> >  #define V4L2_CID_CAMERA_SENSOR_ROTATION              (V4L2_CID_CAMERA_CLASS_BASE+35)
> >
> > +#define V4L2_CID_REGION_OF_INTEREST_RECT     (V4L2_CID_CAMERA_CLASS_BASE+36)
> > +
> >  /* FM Modulator class control IDs */
> >
> >  #define V4L2_CID_FM_TX_CLASS_BASE            (V4L2_CTRL_CLASS_FM_TX | 0x900)
> > diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> > index 3768a0a80830..b712412cf763 100644
> > --- a/include/uapi/linux/videodev2.h
> > +++ b/include/uapi/linux/videodev2.h
> > @@ -1751,6 +1751,7 @@ struct v4l2_ext_control {
> >               __u16 __user *p_u16;
> >               __u32 __user *p_u32;
> >               struct v4l2_area __user *p_area;
> > +             struct v4l2_rect __user *p_rect;
> >               struct v4l2_ctrl_h264_sps __user *p_h264_sps;
> >               struct v4l2_ctrl_h264_pps *p_h264_pps;
> >               struct v4l2_ctrl_h264_scaling_matrix __user *p_h264_scaling_matrix;
> > @@ -1810,6 +1811,7 @@ enum v4l2_ctrl_type {
> >       V4L2_CTRL_TYPE_U16           = 0x0101,
> >       V4L2_CTRL_TYPE_U32           = 0x0102,
> >       V4L2_CTRL_TYPE_AREA          = 0x0106,
> > +     V4L2_CTRL_TYPE_RECT          = 0x0107,
> >
> >       V4L2_CTRL_TYPE_HDR10_CLL_INFO           = 0x0110,
> >       V4L2_CTRL_TYPE_HDR10_MASTERING_DISPLAY  = 0x0111,
>




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