In lists.linux.video4linux, you wrote:
>  On Tue, 2002-03-12 at 19:06, Gerd Knorr wrote:
> > Ronald Bultje wrote:
> > >  just a minor point of critique on v4l2 - why isn't there a field '__u32
> > >  size' in the struct v4l2_requestbuffers?
> > 
> > Because there is a length field in struct v4l2_buffer.  That one is
> > filled by the driver and the application should use it together with
> > the offset to mmap() the buffer.
>  
>  But how should I deal with user-settable buffer sizes?

You can't.

>  In the zoran driver, the user can define a specific buffersize
>  manually,

What this is good for?  If the application sets image size and quality
first the driver should be able to figure a reasonable buffer size.
Why a application should pick another one?

  Gerd

-- 
#include </dev/tty>



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