[Kde-imaging] Gettings a segfault with libkdcraw?

[kde at timotheegroleau.com]

Hello there, 

My name is Tim, I'm a kphotoalbum user and wannabe dev (please bear with me), 
and I'm trying to use likdcraw build myself a batch conversion utility for my 
Nikon D60 raws.

Although I have some (very rusted) c++ background, I have never developed on 
linux before so I'm just getting started. I volunteered help to kphotoalbum 
before but so far, erm, I haven't had time to do anything at all :( .

Anyway, I made a one-file test program with code taken from kphotoalbum (see 
attached  timtest.cpp) which I managed to compile, but which gives me a 
segfault with  the following output (in the method decodeRAWImage of KDcraw).
=============================
processing
<unknown program name>(8027)/ KDcrawIface::KDcraw::loadFromDcraw: LibRaw: 
dcraw emulation:  ("-H 0", "-w", "-q 0", "-o 1", "DSC_6323.NEF")
<unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback: 
LibRaw progress:  Reading metadata  pass  0  of  2
<unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback: 
LibRaw progress:  Reading metadata  pass  1  of  2
<unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback: 
LibRaw progress:  Reading RAW data  pass  0  of  2
<unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback: 
LibRaw progress:  Reading RAW data  pass  1  of  2
<unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback: 
LibRaw progress:  Scaling colors  pass  0  of  2
Scaling with darkness 0, saturation 4095, and
multipliers 1.429688 1.000000 1.933594 1.000000
<unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback: 
LibRaw progress:  Scaling colors  pass  1  of  2
<unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback: 
LibRaw progress:  Pre-interpolating  pass  0  of  2
<unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback: 
LibRaw progress:  Pre-interpolating  pass  1  of  2
Bilinear interpolation...
<unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback: 
LibRaw progress:  Interpolating  pass  0  of  3
<unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback: 
LibRaw progress:  Interpolating  pass  1  of  3
<unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback: 
LibRaw progress:  Interpolating  pass  2  of  3
<unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback: 
LibRaw progress:  Converting to RGB  pass  0  of  2
Converting to sRGB colorspace...
<unknown program name>(8027)/ KDcrawIface::KDcrawPriv::progressCallback: 
LibRaw progress:  Converting to RGB  pass  1  of  2
<unknown program name>(8027)/ KDcrawIface::KDcraw::loadFromDcraw: LibRaw: data 
info: width= 3900  height= 2613  rgbmax= 255
Segmentation fault
=============================
How can I troubleshoot this and move on?

For info on my system, I'm on gentoo, with qt 4.5.2, likdcraw 4.2.4-r1 (that's 
the gentoo version, the header file /usr/include/libkdcraw/version.h shows 
kdcraw_version[] = "0.4.2")

I've uploaded the raw file at the following url, for reference:
http://timotheegroleau.com/tmp/DSC_6323.NEF

kphotoalbum and the kipi raw exporter have no problem handling this file btw,

Maybe to extend on what I am trying to do: I'm making my own utility using 
code taken from kphotoalbum, because kphotoalbum manages to show me my raws 
with the color as per what my Nikon D60 was showing me on its LCD. I tried 
using command line dcraw, and using the raw export in the kipi plugins, but in 
both cases, no matter what parameters I try to change, I am always getting 
images which are either too dark or with washed out colors. kphotoalbum shows 
me the pics just like I want them (the color, exposure, and white balance 
match the embedded thumbnail created by the camera), out of the box. I looked 
at the code and it seems to just use all the default settings of libkdcraw. So 
this is why I'm trying to use it in the same way to see if I would get the 
same results. If there is another way to manage that, I'd be very happy to 
hear about it. In particular, if the kipi raw converter plugin could give the 
same result as kphotoalbum gives me, I'd much rather use that.

Any advice is much appreciated, many thanks in advance.
Tim.

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