Re: [Iaxclient-devel] codec support

[Dima <le...@uk...>]

On Monday 01 March 2004 17:01, Steven Sokol wrote:
> > I'm new to this list. Can somebody update me with info: is any work
> > done for supporting codec other them GSM. I'm interesting on adding iLBC
>
> codec.
>
> We've talked about adding support for iLBC, SpeeX and possibly LPC-10.  We
> also need to put in support for the wasteful but ubiquitous G.711 a/u.
> Before we do that, we need to work out:
>
> 1.  A modular framework for adding codecs to iaxClient
> 2.  How to negotiate codecs over IAX2
> 3.  Which codecs we want and in what order
>
> Can everybody vote for their favorite codecs?  Here's my list in order of
> preference:
>
> 1.  g711 a/u  - Makes us compatible with nearly everything
> 2.  iLBC      - Integrates us with Firefly network, plus others.
> 3.  SpeeX     - Low bandwidth, free, unencumbered
> 4.  ADPCM/G.723	- NOT G.723.1 (patented) but the old, free version
> 5.  G.726/32	- The new codec added by Mark to Asterisk
> 6.  LPC-10		- Because it was there...
> 
for now I'm interested in freeware codecs only: iLBC then g711 then speex.

Checking TODO and sources I see mentioning of 20ms frame size used with GSM. 
Can anybody comment this issue for iLBC codec or may be point to some 
materials.

Thanks,
Dmitry

> We may also want to consider creating a plug-in module to add G.729-C (the
> pseudo-free version of G.729 for non-commercial use).  We need to read the
> license very carefully and perhaps it would require the end user to compile
> their own .so/.dll to make use of this.
>
> I wonder if there is a way to create a commercial G.729 plug-in that can be
> sold via Digium?  If we have a common codec interface that is common across
> all clients, couldn't we create a standard binary dynamic link format for
> each platform (x-nix, Windows, Mac) and ask Digium to sell the plug-ins?
>
> In any case, yes, I would love to see multiple codecs supported.  But
> before we rush in, we need to agree on a modular format that, hopefully,
> can be used to support _any_ codec.
>
> Steve
>
> Steven Sokol
> Owner/Manager
> Sokol & Associates, LLC
>
> Phone:  816.822.1807
> IaxTel: 700.613.9004
> Web:    http://www.sokol-associates.com
>
>
>
>
>
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