Add V4L2_FIELD_ALTERNATE support to SAA7134

[Chris Byrne <chris.byrne (at) monstavision.com>]

Markus Rechberger wrote:
> Hi,
>
> hmm.. is this V4L2_FIELD_ALTERNATE flag supported by any userspace 
> application?

yes, myne :P

I work for Day One Digital Media who create large outdoor LED screens. 
Our controller runs on Linux and uses the video4linux2 api. Recently 
I've added more sophisticated deinterlacing options which rely on
V4L2_FIELD_ALTERNATE.

Chris

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