From: Nicolas Dufresne <nicolas.dufresne@collabora.com>
To: Sakari Ailus <sakari.ailus@iki.fi>,
"Matwey V. Kornilov" <matwey.kornilov@gmail.com>
Cc: linux-media@vger.kernel.org
Subject: Re: v4l2 api: supported resolution negotiation
Date: Mon, 05 Oct 2015 00:15:10 +0100 [thread overview]
Message-ID: <1444000510.26489.4.camel@collabora.com> (raw)
In-Reply-To: <20151004184923.GH26916@valkosipuli.retiisi.org.uk>
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Le dimanche 04 octobre 2015 à 21:49 +0300, Sakari Ailus a écrit :
> I think the GStreamer
> v4lsrc tries very small and very large values. The driver will clamp
> them to
> a supported values which are passed to the application from the
> IOCTL.
In GStreamer we try ENUM_FRAMESIZE, and when no supported, we fallback
to try_fmt() with 1x1 (driver will raise it to the minimum) and then
MAX,MAX (driver will lower it to the maximum). We assume that the
driver supports a range, as iterating over all possibilities takes too
much time.
Nicolas
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next prev parent reply other threads:[~2015-10-04 23:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-04 9:23 v4l2 api: supported resolution negotiation Matwey V. Kornilov
2015-10-04 18:49 ` Sakari Ailus
2015-10-04 23:15 ` Nicolas Dufresne [this message]
2015-10-12 10:24 ` Hans Verkuil
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