Frame rate enumeration ioctl

[David Moore <dcm (at) MIT.EDU>]

I agree with you.  However, while we're at it, I think we should also
have a way of enumerating the frame sizes.

I'd say to be consistent, enumerating framerates should look like:
VIDIOC_ENUM_PARM

And maybe enumerating frame sizes should either be an extension to
VIDIOC_ENUM_FMT, or perhaps it's own ioctl.

-David

On Mon, 2006-05-15 at 15:41 -0700, Martin Rubli wrote:
> 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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