[Freeswitch-users] MP2
Brian West
brian at freeswitch.org
Sat Jan 3 02:00:58 MSK 2015
That looks like just the encoder, so we would need both the encoder and
decoder that takes signed linear. I'll be on the look out for an option
too.
On Fri, Jan 2, 2015 at 4:54 PM, Thomas Auge <auge at virtues.net> wrote:
> > G722 can be a native bearer capability on an ISDN b-channel but thats
> not widely used. MP2 in your case is just
> > establishing a data channel be it via ISDN or IP.
>
> Yup. I'm fairly certain that's what FreeTDM does for G722, else it
> wouldn't make much sense to have a codec
> configuration option. :)
>
>
> > Before proceeding I would seek out a license compatible encoder/decoder
> library that can be used, MP2 can mean so many
> > things their are multiple levels, options and details required to
> properly implement it. I highly suspect its not an
> > afternoon event, I could be wrong if the right library is found thats
> license compatible.
>
> There are a couple, T(w/o)oLame comes to mind. (http://www.twolame.org/
> LGPL licensed) Any pointers as to which
> capabilities are needed in such a library? It seems the libraries are as
> outdated as the codec. :)
>
>
>
> > On Fri, Jan 2, 2015 at 4:20 PM, Thomas Auge <auge at virtues.net <mailto:
> auge at virtues.net>> wrote:
> >
> > There are ISDN devices which establish a digital (data) ISDN
> connection and then use all kinds of codecs on top of that.
> > Think FreeTDM with G722 - same thing. As far as I know FreeTDM
> doesn't care which codec you choose for a digital
> > connection. G722 is just the most common use case.
> >
> > MP2 is still a widely used standard in broadcast, i.e. for remote
> contributions.
> >
> > On 02.01.2015 19:08, Brian West wrote:
> > > I'm still puzzled as to why mp2, since ISDN is native PCM
> (ulaw/alaw), Do you have some legacy files or systems you're
> > > working with that require this? Trying to fully understand your
> thought process and needs.
> > >
> > > On Fri, Jan 2, 2015 at 4:04 PM, Thomas Auge <auge at virtues.net
> <mailto:auge at virtues.net> <mailto:auge at virtues.net <mailto:
> auge at virtues.net>>> wrote:
> > >
> > > Digital ISDN calls, so I think as far as freeswitch is
> concerned, voice calls, yes.
> > >
> > >
> > > On 02.01.2015 18:52, Brian West wrote:
> > > > In what context? playing sound files, voice calls what?
> > > >
> > > > On Fri, Jan 2, 2015 at 3:49 PM, Thomas Auge <
> auge at virtues.net <mailto:auge at virtues.net> <mailto:auge at virtues.net
> <mailto:auge at virtues.net>>
> > <mailto:auge at virtues.net <mailto:auge at virtues.net> <mailto:
> auge at virtues.net <mailto:auge at virtues.net>>>> wrote:
> > > >
> > > > Hello list,
> > > >
> > > > would it be a big task to add mp2 (transcoding) to
> freeswitch? What would be a realistic bounty for it?
> > > >
> > > > Cheers!
> > > >
> > > > Thomas
> > > >
> > > >
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> > > --
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> > > */Brian West/*
> > > brian at freeswitch.org <mailto:brian at freeswitch.org> <mailto:
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> > */Brian West/*
> > brian at freeswitch.org <mailto:brian at freeswitch.org>
> >
> >
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--
*Brian West*
brian at freeswitch.org
*Twitter: @FreeSWITCH , @briankwest*
http://www.freeswitchbook.com
http://www.freeswitchcookbook.com
*T:*+19184209001 | *F:*+19184209002 | *M:*+1918424WEST (9378)
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