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Message-ID: <a618b1b5-48ac-f725-39a6-50ba81b167f0@xs4all.nl>
Date: Fri, 25 May 2018 11:09:02 +0200
From: Hans Verkuil <hverkuil@...all.nl>
To: Keiichi Watanabe <keiichiw@...gle.com>,
linux-arm-kernel@...ts.infradead.org
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Sylwester Nawrocki <s.nawrocki@...sung.com>,
Keiichi Watanabe <keiichiw@...omium.org>,
Smitha T Murthy <smitha.t@...sung.com>,
Tomasz Figa <tfiga@...omium.org>,
Al Viro <viro@...iv.linux.org.uk>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: v4l2-ctrl: Add control for VP9 profile
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@...omium.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)
>
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