[Gdal-dev] Can GDAL GDALDataset return compressed image data

[Lucena, Ivan]

Alison,

Anyone, Correct me If I am wrong but I don't think that in the GDAL API 
there is a function that delivers the haw compressed data block in a 
buffer. But if you look at that piece of code:

http://trac.osgeo.org/gdal/browser/trunk/gdal/frmts/nitf/nitfdataset.cpp#L908

That is where the NITF JPEG buffer is passed to the GDAL JPEG driver to 
be decoded. Then, take a look at the code at:

http://trac.osgeo.org/gdal/browser/trunk/gdal/frmts/jpeg/jpgdataset.cpp#L1099

And line 1274 where generic JPEG tables are loaded to make it look like 
a JFIF file so that the libjpeg can decode it.

Regards,

Ivan


Alison Luo wrote:
> I have my own JPEG and JP2K decoder. I do not need
> decompressed image data stream acquired from
> GDALDataset::RasterIO. I would simply like to get the
> JPEG or JP2K compressed image stream from a NITF file
> through GDAL. Can this be accomplished?
> 
> Thanks,
> Alison
> 
> 
>        
> ____________________________________________________________________________________
> Building a website is a piece of cake. Yahoo! Small Business gives you all the tools to get online.
> http://smallbusiness.yahoo.com/webhosting 
> _______________________________________________
> Gdal-dev mailing list
> Gdal-dev at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/gdal-dev
> 
>