linux-kernel - Re: [PATCH] media: v4l2-ctrl: Add control for VP9 profile

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Date:   Mon, 28 May 2018 21:21:48 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     Hans Verkuil <hverkuil@...all.nl>
Cc:     Keiichi Watanabe <keiichiw@...gle.com>,
        "list@....net:IOMMU DRIVERS <iommu@...ts.linux-foundation.org>, Joerg
        Roedel <joro@...tes.org>," <linux-arm-kernel@...ts.infradead.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        keiichiw@...omium.org, smitha.t@...sung.com,
        viro@...iv.linux.org.uk, andriy.shevchenko@...ux.intel.com,
        ricardo.ribalda@...il.com,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: v4l2-ctrl: Add control for VP9 profile

Hi Hans,

On Fri, May 25, 2018 at 6:09 PM Hans Verkuil <hverkuil@...all.nl> wrote:

> 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.

Indeed. We were supposed to also include a patch for mtk-vcodec driver, but
somehow it went MIA. Keiichi will add it in next revision. Thanks for
giving this a look.

Best regards,
Tomasz