2009-09-24 05:56:19 jpg code

Bhama AVM (INDIA)

Message: 80368

Hi,

in need of jpeg encoder which is optimized for best perfromance in Blackfin.

Let us know avaialbility of this in uClinux ?

is it GPL licensed ? We need non GPL , please help.

Thanks.

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2009-09-24 10:20:26 Re: jpg code

Robin Getz (UNITED STATES)

Message: 80382

Bhama:

Please refer to the docs:

https://docs.blackfin.uclinux.org/doku.php?id=uclinux-dist:libs:libjpeg

We made some Blackfin specific optimizations to that - I'll update the wiki later today.

There is also:

blog.frankvh.com/2009/06/09/blackfin-fast-jpeg-encoding/

-Robin

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2009-09-24 11:18:21 Re: jpg code

Frank Van Hooft (CANADA)

Message: 80393

Note that both of the encoders Robin referred to are GPL'd code. If you're looking for non-GPL code you're probably going to have to search for commercial (paid) offerings.

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2009-09-24 11:41:26 Re: jpg code

Mike Frysinger (UNITED STATES)

Message: 80394

the normal C libjpeg code is not under the GPL: www.ijg.org/

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2009-09-24 12:25:49 Re: jpg code

Robin Getz (UNITED STATES)

Message: 80395

Frank:

Last time I talked to ADI's legal folks, they indicated the code which is distributed under the following: "By using this module you agree to the terms of the Analog Devices License Agreement for DSP Software. " is not compatible with the GPL - which I believe (but could be wrong) is where many people got the optimized DCT from. It appears to be where you got the DCT from:

ftp://ftp.analog.com/pub/www/technology/dsp/Blackfin/benchmarks/vdsp35/Blackfin_FftDct.zip

blog.frankvh.com/wp-content/uploads/2009/06/jpeg.zip

Before we say what is/is not GPL - we need to understand the orgins, and the license restrictions/compatibility. As it stands right now - you don't have the right to release that code under the GPL.

I'm sure that we can work something out, and get things sorted shortly. I will follow up with some private emails.

-Robin

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2009-10-21 01:14:39 Re: jpg code

Frank Van Hooft (CANADA)

Message: 81504

I've updated the JPEG encoder and I'm no longer using the ADI DCT function. This JPEG encoder is now fully GPL. Take a look here:

blog.frankvh.com/2009/10/20/blackfin-jpeg-encoding-an-update/

FYI, the license issue wasn't the reason for the change (although it helped). The real reason was to improve image quality.

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2009-10-21 01:46:08 Re: jpg code

Mike Frysinger (UNITED STATES)