Re: [V4L] Re: v4l2 + select() + read()

[Ben Bridgwater]

Gerd Knorr wrote:

> So IMHO it would be useful to either:
>   - require driver do support *both* non-blocking I/O and partial read()s
> or
>   - allow drivers to support only blocking, full-frame read()s.

Understood.

I'd still vote for the non-blocking support on grounds of select based IO being
highly desireable. However I'd note it's only going to useful for portable
applications if the video API guarantees that *all* drivers will support it.

Ideally bttv would implement non-blocking read by direct dma if there's a
pending read, and bounce-buffer if not, but I realize that's in the area of
diminishing returns. Purely personally I'm happy with mmap, and just miss
select!

Ben




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