Re: [patch] gqview 2.1 and FUJI raw files (.raf)

"Daniel M. German" wrote:
> 
>  John> For the EXIF parser I do not mind adding support for additional
>  John> file formats that also use EXIF. And looking at the way you
>  John> simply point the image loader to jpeg data embedded within the
>  John> raw file - I am starting to agree that this is an acceptable
>  John> approach.
> 
> John, this will be fantastic. You might remember that around 1.5 years
> ago I suggested implementing support for Canon RAW files. You
> indicated that you preferred that support be added at the gdk level.
> 
> I followed your advice and I was able to implement a gdk loader for
> Canon, but it had some serious disadvantages: it assumes the file is
> read from a medium where no SEEK to previous parts is available (sort
> of like a pipe). This is very good for formats that do not need to
> seek to a previous part of the file (like JPEG). But Canon RAW has its
> metadata at the end, so one needs to read the end to be able to know
> where the embedded JPEG is. I "solved" the problem by buffering (in
> disk) the file, the problem, of course, is that it is terribly slow
> (it could also be solved by memory buffering, but at the GDK level
> you never know how many files you will be opening at the same time,
> and I thought it was a waste of memory)

Please see my previous post for the updated 'patch', which adds the image's file
descriptor to the raw format parser so that you have direct access to seek
within the file. Or at least that is the plan as it is unused right now and
image-load.c would need changes as well.

> 
> One challenge, though, is that in CRW files, the photo info is not
> EXIF compatible.

I am curious if perhaps the Canon photo info is stored the same as the
proprietary Makernote of EXIF? If so, it would make it not too trivial as I plan
to eventually add support to parse the Makernote for several camera brands.


Greetings,
John


-- 
John Ellis <[email protected]>

http://gqview.sourceforge.net <GQview> | http://hideseek.sourceforge.net
http://gqmpeg.sourceforge.net <GQmpeg> |     <Preferences Hide and Seek>


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