From: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
To: Hans de Goede <hdegoede@redhat.com>, Hans Verkuil <hverkuil@xs4all.nl>
Cc: linux-media <linux-media@vger.kernel.org>, workshop-2011@linuxtv.org
Subject: Re: [Workshop-2011] RFC: V4L2 API ambiguities
Date: Mon, 13 Aug 2012 21:15:58 +0200 [thread overview]
Message-ID: <5029526E.7020605@gmail.com> (raw)
In-Reply-To: <5028FD7E.1010402@redhat.com>
Hi!
On 08/13/2012 03:13 PM, Hans de Goede wrote:
>> 2) If a driver supports only formats with more than one plane, should
>> V4L2_CAP_VIDEO_CAPTURE still be defined?
>
> No
Agreed.
>> And if a driver also supports
>> single-plane formats in addition to >1 plane formats, should
>> V4L2_CAP_VIDEO_CAPTURE be compulsary?
>
> Yes, so that non multi-plane aware apps keep working.
There is the multi-planar API and there are multi-planar formats. Single-
and multi-planar formats can be handled with the multi-planar API. So if
a driver supports single- and multi-planar formats by means on multi-planar
APIs, there shouldn't be a need for signalling V4L2_CAP_VIDEO_CAPTURE,
which normally indicates single-planar API. The driver may choose to not
support it, in order to handle single-planar formats. Thus, in my opinion
making V4L2_CAP_VIDEO_CAPTURE compulsory wouldn't make sense. Unless the
driver supports both types of ioctls (_mplane and regular versions), we
shouldn't flag V4L2_CAP_VIDEO_CAPTURE.
Regards,
Sylwester
next prev parent reply other threads:[~2012-08-13 19:16 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-13 12:27 RFC: V4L2 API ambiguities Hans Verkuil
2012-08-13 13:13 ` [Workshop-2011] " Hans de Goede
2012-08-13 14:52 ` Hans Verkuil
2012-08-13 14:58 ` Hans de Goede
2012-08-13 15:09 ` Ilyes Gouta
2012-08-13 19:15 ` Sylwester Nawrocki [this message]
2012-08-14 8:13 ` Hans de Goede
2012-08-14 0:00 ` Laurent Pinchart
2012-08-14 8:15 ` Hans de Goede
2012-08-13 16:09 ` Rémi Denis-Courmont
2012-08-13 20:27 ` Walter Van Eetvelt
2012-08-13 21:31 ` Devin Heitmueller
2012-08-13 21:39 ` Mauro Carvalho Chehab
2012-08-13 21:42 ` Devin Heitmueller
2012-08-13 21:55 ` Mauro Carvalho Chehab
2012-08-13 23:54 ` [Workshop-2011] " Laurent Pinchart
2012-08-14 10:54 ` Hans Verkuil
2012-08-14 11:06 ` Laurent Pinchart
2012-08-14 11:11 ` Hans Verkuil
2012-08-14 11:15 ` Laurent Pinchart
2012-08-14 11:32 ` Hans Verkuil
2012-08-14 11:42 ` Laurent Pinchart
2012-08-14 21:14 ` Guennadi Liakhovetski
2012-08-14 22:10 ` Laurent Pinchart
2012-08-14 12:43 ` Hans de Goede
2012-08-14 12:44 ` Chinmay V S
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