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Subject: Re: [PATCH] media: v4l2-ctrl: Add control for VP9 profile
To:     Keiichi Watanabe <keiichiw@google.com>,
        linux-arm-kernel@lists.infradead.org
Cc:     Mauro Carvalho Chehab <mchehab@kernel.org>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Sylwester Nawrocki <s.nawrocki@samsung.com>,
        Keiichi Watanabe <keiichiw@chromium.org>,
        Smitha T Murthy <smitha.t@samsung.com>,
        Tomasz Figa <tfiga@chromium.org>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>,
        linux-media@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20180517095349.203865-1-keiichiw@chromium.org>
From:   Hans Verkuil <hverkuil@xs4all.nl>
Message-ID: <a618b1b5-48ac-f725-39a6-50ba81b167f0@xs4all.nl>
Date:   Fri, 25 May 2018 11:09:02 +0200
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On 17/05/18 11:53, Keiichi Watanabe wrote:
> Add a new control V4L2_CID_MPEG_VIDEO_VP9_PROFILE for selecting desired
> profile for VP9 encoder and querying for supported profiles by VP9 encoder
> or decoder.
> 
> An existing control V4L2_CID_MPEG_VIDEO_VPX_PROFILE cannot be
> used for querying since it is not a menu control but an integer
> control, which cannot return an arbitrary set of supported profiles.
> 
> The new control V4L2_CID_MPEG_VIDEO_VP9_PROFILE is a menu control as
> with controls for other codec profiles. (e.g. H264)

I don't mind adding this control (although I would like to have an Ack from
Sylwester), but we also need this to be used in an actual kernel driver.

Otherwise we're adding a control that nobody uses.

Regards,

	Hans

> 
> Signed-off-by: Keiichi Watanabe <keiichiw@chromium.org>
> ---
> 
>  .../media/uapi/v4l/extended-controls.rst      | 26 +++++++++++++++++++
>  drivers/media/v4l2-core/v4l2-ctrls.c          | 12 +++++++++
>  include/uapi/linux/v4l2-controls.h            |  8 ++++++
>  3 files changed, 46 insertions(+)
> 
> diff --git a/Documentation/media/uapi/v4l/extended-controls.rst b/Documentation/media/uapi/v4l/extended-controls.rst
> index 03931f9b1285..4f7f128a4998 100644
> --- a/Documentation/media/uapi/v4l/extended-controls.rst
> +++ b/Documentation/media/uapi/v4l/extended-controls.rst
> @@ -1959,6 +1959,32 @@ enum v4l2_vp8_golden_frame_sel -
>      Select the desired profile for VPx encoder. Acceptable values are 0,
>      1, 2 and 3 corresponding to encoder profiles 0, 1, 2 and 3.
>  
> +.. _v4l2-mpeg-video-vp9-profile:
> +
> +``V4L2_CID_MPEG_VIDEO_VP9_PROFILE``
> +    (enum)
> +
> +enum v4l2_mpeg_video_vp9_profile -
> +    This control allows to select the profile for VP9 encoder.
> +    This is also used to enumerate supported profiles by VP9 encoder or decoder.
> +    Possible values are:
> +
> +
> +
> +.. flat-table::
> +    :header-rows:  0
> +    :stub-columns: 0
> +
> +    * - ``V4L2_MPEG_VIDEO_VP9_PROFILE_0``
> +      - Profile 0
> +    * - ``V4L2_MPEG_VIDEO_VP9_PROFILE_1``
> +      - Profile 1
> +    * - ``V4L2_MPEG_VIDEO_VP9_PROFILE_2``
> +      - Profile 2
> +    * - ``V4L2_MPEG_VIDEO_VP9_PROFILE_3``
> +      - Profile 3
> +
> +
>  
>  High Efficiency Video Coding (HEVC/H.265) Control Reference
>  -----------------------------------------------------------
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> index d29e45516eb7..401ce21c2e63 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -431,6 +431,13 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
>  		"Use Previous Specific Frame",
>  		NULL,
>  	};
> +	static const char * const vp9_profile[] = {
> +		"0",
> +		"1",
> +		"2",
> +		"3",
> +		NULL,
> +	};
>  
>  	static const char * const flash_led_mode[] = {
>  		"Off",
> @@ -614,6 +621,8 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
>  		return mpeg4_profile;
>  	case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
>  		return vpx_golden_frame_sel;
> +	case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
> +		return vp9_profile;
>  	case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
>  		return jpeg_chroma_subsampling;
>  	case V4L2_CID_DV_TX_MODE:
> @@ -841,6 +850,8 @@ const char *v4l2_ctrl_get_name(u32 id)
>  	case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP:		return "VPX P-Frame QP Value";
>  	case V4L2_CID_MPEG_VIDEO_VPX_PROFILE:			return "VPX Profile";
>  
> +	case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:			return "VP9 Profile";
> +
>  	/* HEVC controls */
>  	case V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_QP:		return "HEVC I-Frame QP Value";
>  	case V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_QP:		return "HEVC P-Frame QP Value";
> @@ -1180,6 +1191,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
>  	case V4L2_CID_DEINTERLACING_MODE:
>  	case V4L2_CID_TUNE_DEEMPHASIS:
>  	case V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL:
> +	case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:
>  	case V4L2_CID_DETECT_MD_MODE:
>  	case V4L2_CID_MPEG_VIDEO_HEVC_PROFILE:
>  	case V4L2_CID_MPEG_VIDEO_HEVC_LEVEL:
> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> index 8d473c979b61..56203b7b715c 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -589,6 +589,14 @@ enum v4l2_vp8_golden_frame_sel {
>  #define V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP		(V4L2_CID_MPEG_BASE+510)
>  #define V4L2_CID_MPEG_VIDEO_VPX_PROFILE			(V4L2_CID_MPEG_BASE+511)
>  
> +#define V4L2_CID_MPEG_VIDEO_VP9_PROFILE			(V4L2_CID_MPEG_BASE+512)
> +enum v4l2_mpeg_video_vp9_profile {
> +	V4L2_MPEG_VIDEO_VP9_PROFILE_0				= 0,
> +	V4L2_MPEG_VIDEO_VP9_PROFILE_1				= 1,
> +	V4L2_MPEG_VIDEO_VP9_PROFILE_2				= 2,
> +	V4L2_MPEG_VIDEO_VP9_PROFILE_3				= 3,
> +};
> +
>  /* CIDs for HEVC encoding. */
>  
>  #define V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP		(V4L2_CID_MPEG_BASE + 600)
>