"Nemosoft Unv." wrote:
> On 30-May-01 Mark McClelland wrote:
> >
> >> Im assuming the library is something like
> >>
> >> convert_fromfmt_tofmt(from, to
> >>
> > Not to nitpick, but wouldn't this be better:
> >
> > convert(src, srcformat, dest, destformat)
> >
> > That way, new formats could be added without changing the apps' code (or
> > even without recompiling it if we use a shared lib)
>
> In case you�re interested... I�ve written up my idea on how an (expandable)
> shared library should look like. The URL is http://www.smcc.demon.nl/ccvt/
> This is a draft, not fully completed yet, and open for debate. It contains
> documentation from both the programmers point of view (us!), and the
> library maintainers/writers (ehm, us? :)) POV.
Actually I've already implemented such a beast. I have no objection to GPLing it
(that was my general intent), other than the fact that I'm too lazy to create a
web page or put much effort into support. You've shamed me - I'll release it.
;-) What I have does pretty much all RGB<->YUV conversions, but all in C at this
point. I define an "Image Descriptor" data structure which defines the
representation (packed/planar YUV or packed RGB with appropriate paramaters such
as chroma subsampling and r/g/b bpp and component masks) and includes pointers
to the data (with row stride for flexibility). This data structure can for
example describe all V4L and AVI RGB/YUV formats as well as a TrueColor XImage
(packed RGB).
The way I've structured it is to allow for individual optimized conversions, so
any of my C implementations could be individually replaced with MMX/whatever
implementations). Since this is intended for use with repeated (video)
conversions, you first request a converter function (converter =
GetConverter(imageDesc1, imageDesc2), which internally does a table lookup for a
corresponding converter), and then use it to perform conversions
(converter(imageDescIn, imageDescOut).
Gimme a week to procastinate, and I'll release the thing.
Ben
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