topic jpeg decoder problem in Intel® Integrated Performance Primitives

jpeg decoder problem

fanguts — Wed, 22 Jul 2009 16:01:36 GMT

Hi : I am using an example in UIC document 3-32. This simple example only require to include "uic_jpeg_dec.h". when I build it and gotone error: error C3861: 'AlignStep': identifier not found
Question1: I wonder where AlignStep is defined ?

Question2:
I saw in this example: dataOrder.LineStep() [0] = AlignStep(geometry.RefGridRect().Width() *nOfComponents);
If I use dataOrder.LineStep() [0]=((geometry.RefGridRect().Width() * nOfComponents *du+ 3) & ~3) to replace AlignStep(), the program can be build.
After call ReadData(), I got depressed data from imageCn.Buffer().DataPtr(). How can I know the buffer data is correct?
I also create a data buffer with more than enough size (> image width X height X Chanel X sizeof(Ipp8u) ). I am trying to memcpyimageCn.Buffer().DataPtr() to my own data buffer, but the program crash. I think the problem is not my buffer size but imageCn.Buffer().DataPtr() . please give me suggestion how can I know problem in imageCn.Buffer().DataPtr()?

Question 3;
I want to copy the depressed image data to a buffer -myBuf (BYTE type) and sent the data from myBuf to our application. I create: BYTE *myBuf (also allocation enough size).
How can I copy or send the data from imageCn.Buffer().DataPtr() to myBuf ? I used memcpy but got problem.
Thank you for helps

Re: jpeg decoder problem

Vladimir_Dudnik — Thu, 23 Jul 2009 18:46:30 GMT

by the way, you may avoid copying data from UIC ImageBuffer to your application buffer. Did you notice Attach() method in UIC ImageBuffer object? Instead of allocating pixels memory in UIC you mayattach your own memory buffer. Just need to be careful with correct buffer description (image step, data type and so on)

Vladimir

Re: jpeg decoder problem

fanguts — Fri, 24 Jul 2009 21:36:11 GMT

Quoting - Vladimir Dudnik (Intel)

thanks Vladimir, now the my jpeg decorder is work