[Ffmpeg-devel] moving non-SIMD parts of libswscale to LGPL

[Michel Bardiaux]

Luca Abeni wrote:
> Hi all,
> 
> a good number of swscale authors agreed to relicense the non-SIMD parts
> as LGPL 

What are the plans for the SIMD parts?

> (I still need to contact some authors, I hope there will be no
> problems for what concerns swscale* and rgb2rgb*), so I started looking
> at preparing a patch for this...
> 
> The problem is that I've not been able to contact the authors of
> yuv2rgb* (most of the email addresses listed in the files headers are
> not valid anymore, and my emails bounched).
> Since such files are only used for fast unscaled conversions and swscale
> should be able to work even without them (as pointed out by Michael), I
> tried to compile libswscale without using yuv2rgb*.
> 
> But swscale.c and swscale_template.c use some tables that are contained
> in yuv2rgb.c... Since (I think - please correct me if I am wrong) tables
> are not copyrightable, I linked them in the LGPL version of the
> library... But then yuv2rgb_c_init_tables() is needed...
> So, the attached patch seems to work, but it is linking some code from
> yuv2rgb.c... And I do not think it is legal to link such (GPLed) code
> treating it as LGPLed.
> 
> Since I do not know much about that code, I do not know if it is
> possible to obtain a working libswscale without linking any code from
> yuv2rgb.c... Can anyone help me?
> 
> 


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Michel Bardiaux
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