topic Re: 8 bit grayscale mjpeg decode problem in Intel® Integrated Performance Primitives

8 bit grayscale mjpeg decode problem

ynhuang — Fri, 10 Jul 2009 02:44:01 GMT

Hi

I use ipp 5.3 towrite a program to dispaly stream from ip camera. I use UMC jpeg decoder to decode mjpeg stream.

It works well until decode8 bit grayscalemjpeg. The image incorrect and sometime UMC jpeg decoder crash.

Does anyone knows ipp and UMC 5.3 support 8 bit grayscalemjpeg ? Or how to fix this problem ?

Re: 8 bit grayscale mjpeg decode problem

Sergey_Ryadno — Mon, 13 Jul 2009 08:53:40 GMT

Quoting - ynhuang

Hi, can you attach here this 8 bit grayscale mjpeg file? It will be very helpful to us in invistigating this issue.

Re: 8 bit grayscale mjpeg decode problem

ynhuang — Tue, 14 Jul 2009 06:21:14 GMT

Quoting - sryadno

Hi, can you attach here this 8 bit grayscale mjpeg file? It will be very helpful to us in invistigating this issue.

Hi sryadno,
grayscale.zip is the mjpeg file that I use.

Re: 8 bit grayscale mjpeg decode problem

Sergey_Ryadno — Tue, 14 Jul 2009 09:09:31 GMT

Quoting - ynhuang

Hi, try to change incodecjpegsrcjpegdec.cpp in function ColorConvert() in case "Gray to BGR"

this strings

pSrc8u[0] = m_ccomp[0].GetCCBufferPtr(thread_id);
pSrc8u[1] = m_ccomp[2].GetCCBufferPtr(thread_id);
pSrc8u[2] = m_ccomp[2].GetCCBufferPtr(thread_id);

to this

pSrc8u[0] = m_ccomp[0].GetCCBufferPtr(thread_id);
pSrc8u[1] = m_ccomp[0].GetCCBufferPtr(thread_id);
pSrc8u[2] = m_ccomp[0].GetCCBufferPtr(thread_id);

I think it mast fix this issue.

Re: 8 bit grayscale mjpeg decode problem

Sergey_Ryadno — Tue, 14 Jul 2009 09:56:39 GMT

Quoting - sryadno

Hi, try to change incodecjpegsrcjpegdec.cpp in function ColorConvert() in case "Gray to BGR"

this strings

pSrc8u[0] = m_ccomp[0].GetCCBufferPtr(thread_id);
pSrc8u[1] = m_ccomp[2].GetCCBufferPtr(thread_id);
pSrc8u[2] = m_ccomp[2].GetCCBufferPtr(thread_id);

to this

pSrc8u[0] = m_ccomp[0].GetCCBufferPtr(thread_id);
pSrc8u[1] = m_ccomp[0].GetCCBufferPtr(thread_id);
pSrc8u[2] = m_ccomp[0].GetCCBufferPtr(thread_id);

I think it mast fix this issue.

Applying of this changes lead to correct show attached mjpeg file in umc simple_player.

Re: 8 bit grayscale mjpeg decode problem

ynhuang — Thu, 16 Jul 2009 09:10:48 GMT

Quoting - sryadno

Applying of this changes lead to correct show attached mjpeg file in umc simple_player.

Thanks a lot. I can dispaly this video correct now