Using Intel IPP to decompress a lossless JPEG

Question

I am trying to decompress the following lossless JPEG bitstream (ITU 81):

• http://gdcm.sourceforge.net/thingies/intel_ipp_lossless.jpg

It seems to have been generated by:

$ strings -n 20 intel_ipp_lossless.jpg 
4Intel(R) IPP JPEG encoder [5.3.497] - Aug 12 2008

Which is compatible with:

• https://software.intel.com/en-us/forums/intel-integrated-performance-primitives/topic/282884

IPP JPEG supportsfollowing compression modes defined by JPEG ISO/IEC 10918:

1. Baseline, 8-bits, DCT based process, huffman entropy coding
2. Extended baseline, 8- and 12-bits, DCT based process, huffman entropy coding
3. Lossless, 1..16 bits, prediction based, huffman entropy coding

But I am having a hard time understanding how to use IPP:

• https://software.seek.intel.com/performance-libraries
  • -> Intel® Integrated Performance Primitives

When I look at the examples I cannot find anything related to JPEG decompression anymore.

Where/How can I use IPP JPEG decoder ?

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Update: Seems like intel ipp forum is not very active anymore.

• https://software.intel.com/en-us/forums/intel-integrated-performance-primitives/topic/809600

Answer 1

Turns out this is poorly documented, but some function (in particular the JPEG codec) has been removed. So you need to use the Legacy IPP library from:

• Intel® IPP Legacy Libraries

With documentation at:

• How to Build Intel® IPP Legacy Samples with Intel IPP 9.0 Legacy Libraries

The difficult part is that the sample tar file is not accessible for new user as mentionned here:

• https://software.intel.com/en-us/forums/intel-integrated-performance-primitives/topic/585171

So I'll need to write my own JPEG decoder based of the following forum post (ippiDecodeHuffmanOne_JPEG_1u16s_C1 reference):

• https://software.intel.com/en-us/forums/intel-integrated-performance-primitives/topic/304947

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Update: instead one should search for ipp samples such as w_ipp-samples_p_7.1.1.013.zip (or ipp-samples.8.0.0.005) on internet to have access to the JPEG compressor/decompressor.