From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Nicolas Dufresne <nicolas@ndufresne.ca>
Cc: Hans Verkuil <hverkuil-cisco@xs4all.nl>,
David Laight <David.Laight@ACULAB.COM>,
Benjamin Gaignard <benjamin.gaignard@collabora.com>,
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Subject: Re: [RFC 2/4] media: videobuf2: Replace bufs array by a list
Date: Wed, 22 Mar 2023 17:01:53 +0200 [thread overview]
Message-ID: <20230322150153.GO20234@pendragon.ideasonboard.com> (raw)
In-Reply-To: <f085aa9225c573df906bdc7ff032a8fd591b18b3.camel@ndufresne.ca>
On Wed, Mar 22, 2023 at 10:50:52AM -0400, Nicolas Dufresne wrote:
> Hi Laurent,
>
> Le lundi 20 mars 2023 à 01:33 +0200, Laurent Pinchart a écrit :
> > > The typical usage is that applications allocate N buffers with the
> > > VIDIOC_REQBUFS ioctl, and in most cases that's all they use.
> >
> > Note that once we get DELETE_BUF (or DELETE_BUFS) support I'd like to
> > encourage applications to use the new API, and deprecate REQBUFS
> > (dropping it isn't on my radar, as it would take forever before no
> > userspace uses it anymore).
>
> I was wondering if you can extend on this. I'm worried the count semantic might
> prevent emulating it over create_bufs() ops, but if that works, did you meant to
> emulate it so driver no longer have to implement reqbufs() if they have
> create_bufs() ?
For drivers it should be fairly simply, as the reqbufs and create_bufs
ioctl handlers should just point to the corresponding videobuf2 helpers.
What I meant is that I'd like to encourage userspace to use the
VIDIOC_CREATE_BUFS ioctl instead of VIDIOC_REQBUFS.
--
Regards,
Laurent Pinchart
next prev parent reply other threads:[~2023-03-22 15:01 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-13 13:59 [RFC 0/4] Allow more than 32 vb2 buffers per queue Benjamin Gaignard
2023-03-13 13:59 ` [RFC 1/4] media: videobuf2: Use vb2_get_buffer() as helper everywhere Benjamin Gaignard
2023-03-13 16:51 ` Andrzej Pietrasiewicz
2023-03-13 16:56 ` Benjamin Gaignard
2023-03-13 18:01 ` Laurent Pinchart
2023-03-13 18:04 ` Laurent Pinchart
2023-03-13 13:59 ` [RFC 2/4] media: videobuf2: Replace bufs array by a list Benjamin Gaignard
2023-03-13 18:11 ` Laurent Pinchart
2023-03-13 23:16 ` David Laight
2023-03-14 8:55 ` Hans Verkuil
2023-03-14 10:11 ` David Laight
2023-03-14 10:42 ` Hans Verkuil
2023-03-19 23:33 ` Laurent Pinchart
2023-03-22 14:50 ` Nicolas Dufresne
2023-03-22 15:01 ` Laurent Pinchart [this message]
2023-03-24 15:14 ` Nicolas Dufresne
2023-03-24 15:18 ` Hans Verkuil
2023-03-24 15:34 ` Nicolas Dufresne
2023-03-24 20:21 ` Laurent Pinchart
2023-03-15 13:57 ` Nicolas Dufresne
2023-03-19 23:33 ` Laurent Pinchart
2023-03-13 13:59 ` [RFC 3/4] media: videobuf2: Use bitmap to manage vb2 index Benjamin Gaignard
2023-03-13 18:14 ` Laurent Pinchart
2023-03-14 2:10 ` [EXT] " Ming Qian
2023-03-13 13:59 ` [RFC 4/4] media: videobuf2: Stop define VB2_MAX_FRAME as global Benjamin Gaignard
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