[gst-devel] using ORC for g729 documentation

[SP GLE]

IMHO using a codec bitstream compatible with g729,for interoperability or not, whatever is name or the algorithm it uses may be subject to licensing.... But I'm not a lawyer and not sure about that.

I'll send you source for gst plugins ASAP.

--- En date de : Mar 17.3.09, Gibro Vacco <gibrovacco at gmail.com> a écrit :

> De: Gibro Vacco <gibrovacco at gmail.com>
> Objet: Re: [gst-devel] using ORC for g729 documentation
> À: "Discussion of the development of GStreamer" <gstreamer-devel at lists.sourceforge.net>
> Date: Mardi 17 Mars 2009, 11h29
> Hello,
> 
> > - the library used is a patched version of ITU g729
> source code (the reference code is not thread safe and uses
> a lot of static variables to keep some processing data, thus
> two channels at the same time would corrupt each other). The
> original itu soure code is fetched and a patch applied in
> order to generate library.
> 
> Yes I know.. that's the reason for which I'd like to start
> re-writing
> a g729 codec from scratch, starting from the non-patented
> points .
> 
> > - the reference code is ITU licensed so I encourage
> you to forget this implementation due to this licensing and
> to rewrite your own implementation .
> 
> I agree, see my note of above.
> 
> > - The g729 codec requires license for usage (www sipro
> com)
> 
> I guess it's so only if you call it "g729" or base it on
> reference
> code.. if one guy:
> 
> 1) calls a codec (written from scratch) "HumpyDumpty"
> saying it's
> compliant with ITU-T specs.
> 2) develops and stores it only where algorithms aren't
> patentable and
> freedom is still a reality (so far).
> 
> I guess there shouldn't be any dangerous issues for him.
> This very guy
> must of course avoid re-distributing neither reference code
> (which is
> copyrighted material from ITU-T) nor binaries obtained from
> it.
> 
> If a second guy will then want to re-distribute this code
> or binaries
> obtained from it in a liberty-restricted country it's then
> up to him
> to kindly ask wipro for a license. Meanwhile the rest of
> the world can
> take advantage of using this codec with gstreamer.
> 
> Please correct me if I'm wrong.
> 
> P.S. btw at the moment I'm not "touching" copyrighted
> algorithms, only
> the architecture-specific optimizations about, i.e. 64
> bits
> multiplications that I guess aren't copyrighted even in
> many
> coding-freedom-restricted countries.
> 
> > - The g729 gst plugins are quite simple and probably
> attached to a bug but i can send it back if you want.
> 
> I'd appreciate it, thank you very much.
> 
> Regards,
> Gibro
> 
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