linux-kernel - Re: [PATCHv3 3/6] media: v4l UAPI: add ROI auto-controls flags

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Date:   Wed, 24 Mar 2021 16:35:43 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Ricardo Ribalda <ribalda@...omium.org>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv3 3/6] media: v4l UAPI: add ROI auto-controls flags

On (21/03/24 08:28), Ricardo Ribalda wrote:
[..]
> > >
> > > Are you sure that you do not want to start with 1<<3, there might be
> > > some hardware that support LE/SE
> >
> > How the hardware's going to support this? There is simply no way to
> > pass these flags to the firmware, the values already overlap with
> > auto-controls. So I guess these flags are for the driver (C code).
> > uvcvideo driver is not doing any "lesser or equal rectangle" magic
> > for ROI. No such thing is defined by UVC spec.
> 
> The driver can implement se/le.

Right. I wonder if we can actually fit ROI into selection API.
v4l2 selection is focusing on rectangle, that's the only thing
that matters, but in ROI rectangle and autocontrols are equally
important.