Frame rate enumeration ioctl

[michel Xhaard <mxhaard (at) magic.fr>]

Le Mardi 16 Mai 2006 00:41, Martin Rubli a écrit :
> Hi all,
>
> We've been trying to improve the way that the GStreamer V4L2 source
> handles frame rates when used with webcams. Given that GStreamer uses
> capability negotiation, we ran into the problem of retrieving a list of
> supported framerates.
>
> Currently, there seems no way (except for trial and error) of enumerating
> the frame rates that a device supports.
>
> We'd like to propose a new ioctl that allows enumerating the supported
> frame rates for the currently used capture format (e.g.
> VIDIOC_ENUM_FRAMERATE). If there's interest, we can write up a draft. It
> would greatly simplify things for applications like GStreamer, Ekiga, etc.
> that work with webcams.
>
> Thanks in advance for any comments ...
>
> Cheers,
> Martin
>
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Martin,
Instead of create a new ioctl() as v4l2 have a lot :) why not used 
VIDIOC_ENUM_FMT to pass parameters the apps need to know from the hardware ?
If we know that the hardware support for example YUYV for 1024 x 768 is a 
range of framerate min to max is enought ?
Cheers,
-- 
Michel Xhaard
http://mxhaard.free.fr

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