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January 2011
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2011.01.25 02:00 "Re: Cannot read YCbCr JPEG-compressed images", by Olivier Paquet
On Mon, Jan 24, 2011 at 8:02 PM, Craig Bruce <csbruce@cubewerx.com> wrote: > If I build it using the system libraries on my computer (Linux x86_64, > Fedora 13, libtiff 3.9.4), it works: > > $ gcc tile.c -ltiff -ljpeg -lz -lm -o tile_test > $ ./tile_test > TIFFReadDirectory: Warning, Q09050_006_NIR.tif: unknown field with tag > 50742 (0xc636) encountered. > tileNum=0, tileSize=98304, buf=0x2124a60 > successful read, size=98304 > > However, if I build and link with my own libtiff 4.0.0beta6 with the > default configuration, I get the buffer error: > > $ gcc -I ~/tiff-4.0.0beta6/libtiff tile.c > ~/tiff-4.0.0beta6/libtiff/.libs/libtiff.a -ljpeg -lz -lm -o tile_test > $ ./tile_test > TIFFReadDirectory: Warning, Unknown field with tag 50742 (0xc636) > encountered. > TIFFFetchNormalTag: Warning, ASCII value for tag "ImageDescription" does > not end in null byte. > TIFFFetchNormalTag: Warning, ASCII value for tag "Software" does not end > in null byte. > tileNum=0, tileSize=98304, buf=0x22092b0 > JPEGDecodeRaw: application buffer not large enough for all data.. > ERROR! I tried both my system libtiff (3.9.4 too but on slackware) and the CVS head of 4.0 and got a segfault in jpeg_read_raw_data. This seems to be called from libtiff just after the code which generates the error you got above so it's probably related. > The behaviour is consistent across a couple different versions of Fedora- > built and personally-build libtiffs. Is there some special libtiff > configuration needed to make YCbCr/JPEG reading work properly? I need > to use a custom-built libtiff. I suspect the different results we're seeing between people here might have something to do with the libjpeg involved. Mine is libjpeg.so.8.0.1. Oh and for what it's worth, I get the segfault no matter how large I make the buffer in your test program. Olivier