topic Re: Decoding overflow / failure in latest IPP JPEG code with at in Intel® Integrated Performance Primitives

Decoding overflow / failure in latest IPP JPEG code with attached image

johnt — Mon, 09 Feb 2009 22:44:53 GMT

Hi there,

The latest IPP JPEG code loads the following image incorrectly when using 1/8th size (JD_1_8):
http://www.jrmediacenter.com/DevZone/CustomApps/Temporary/Heroes_1b468487.jpg

The black area at the bottom of the image gets blown out to white (overflow?).

Please note that we're using IPP in a widely used, commercially shipping product, and this is the first image we've seen this on.

Thanks,
-John

Re: Decoding overflow / failure in latest IPP JPEG code with at

johnt — Tue, 10 Feb 2009 19:06:28 GMT

Re: Decoding overflow / failure in latest IPP JPEG code with at

Vladimir_Dudnik — Wed, 11 Feb 2009 16:10:30 GMT

Quoting - johnt@jriver.com

Hi John,

What version of IPP do you use and what JPEG codec (is that from JPEGView sample or UIC codecs?)

Regards,
Vladimir

Re: Decoding overflow / failure in latest IPP JPEG code with at

johnt — Wed, 11 Feb 2009 16:56:19 GMT

Quoting - Vladimir Dudnik (Intel)

Hi John,

What version of IPP do you use and what JPEG codec (is that from JPEGView sample or UIC codecs?)

Regards,
Vladimir

Hi Vladimir,

We were using IPP 5.3 (with some custom patches we worked out together to fix existing bugs).

Because of this problem,we updated to IPP 6.0.1:
w_ipp_ia32_p_6.0.1.070.exe
w_ipp-samples_p_6.0.0.127.zip

The JPEG code is from JPEGView.

Updating to 6.0.1 did not change the problem in any way.

Thanks,
John

Re: Decoding overflow / failure in latest IPP JPEG code with at

Vladimir_Dudnik — Wed, 11 Feb 2009 18:39:45 GMT

Thanks for info, we were able to reproduce the issue. Please stay tuned, we will do our best to provide you fix.

Regards,
Vladimir

Re: Decoding overflow / failure in latest IPP JPEG code with at

johnt — Thu, 12 Feb 2009 15:57:42 GMT

Quoting - Vladimir Dudnik (Intel)

Thanks for info, we were able to reproduce the issue. Please stay tuned, we will do our best to provide you fix.

Regards,
Vladimir

Thanks Vladimir. We'll stand by for a fix.

John

Re: Decoding overflow / failure in latest IPP JPEG code with at

Sergey_Ryadno — Fri, 13 Feb 2009 07:03:03 GMT

hiJohn.

Try to change in jpegdec.cpp definition ofDCT_QUANT_INV8x8To1x1LS macro from

#define DCT_QUANT_INV8x8To1x1LS(pMCUBuf, dst, qtbl)
{
int val = (Ipp8u)(((pMCUBuf[0] * qtbl[0]) >> 3) + 128);
dst[0] = (Ipp8u)(val > 255 ? 255 : (val < 0 ? 0 : val));
}

to this

#define DCT_QUANT_INV8x8To1x1LS(pMCUBuf, dst, qtbl)
{
int val = (((pMCUBuf[0] * qtbl[0]) >> 3) + 128);
dst[0] = (Ipp8u)(val > 255 ? 255 : (val < 0 ? 0 : val));

}

Re: Decoding overflow / failure in latest IPP JPEG code with at

johnt — Fri, 13 Feb 2009 15:00:35 GMT

Quoting - sryadno

hiJohn.

Try to change in jpegdec.cpp definition ofDCT_QUANT_INV8x8To1x1LS macro from

#define DCT_QUANT_INV8x8To1x1LS(pMCUBuf, dst, qtbl)
{
int val = (Ipp8u)(((pMCUBuf[0] * qtbl[0]) >> 3) + 128);
dst[0] = (Ipp8u)(val > 255 ? 255 : (val < 0 ? 0 : val));
}

to this

#define DCT_QUANT_INV8x8To1x1LS(pMCUBuf, dst, qtbl)
{
int val = (((pMCUBuf[0] * qtbl[0]) >> 3) + 128);
dst[0] = (Ipp8u)(val > 255 ? 255 : (val < 0 ? 0 : val));

}

Thank you very much. That does the trick.

Cheers,
John