[Speex-dev] Speex development

Jean-Marc Valin jmvalin at jmvalin.ca
Fri Nov 12 04:34:21 PST 2010

Essentially, the thing that's been holding up 1.2 was the AEC and
preprocessor. The codec itself is pretty stable and I do not really see
more work happening on it. As for the AEC and preprocessor, these are
really open-ended project and I lack sufficient time to take care of them.


On 10-11-12 03:27 AM, Ken Smith wrote:
> Basically, Speex is the brain child of Jean-Marc Valin, and from what
> I can tell, he has since moved on to other projects, though he
> continues to monitor this list.  So no, it's not really being
> developed anymore.  And what's out there really is good enough for a
> great many applications.  
> That said, there remains room for improvement, mostly in the
> pre-processor (the codec itself is very mature).  To take a few known
> issues: 
> (1) The main codec doesn't have full fixed point support for all of
> its modes.  
> (2) The acoustic echo cancellation, in my experience, gives you real
> but far from perfect echo cancellation.  (And a lot of theoretical
> work has been done in that area since Valin coded it up in 2005.)
> (3) The VAD for the pre-processor needs to be rewritten.  (The
> comments in the code describe it as a "kludge".)  
> (4) I've found that the AGC in the preprocessor can act rather
> strangely at times.
> (5) The AGC in the pre-processor doesn't have fixed-point support.
> (6) There are Java (JSpeex) and C# (CSpeex) ports, but they only
> implement the codec, not the pre-processor, jitter buffer, AEC, or any
> of the other parts of the Speex library.  It would be great if someone
> were to port the remainder of the Speex library over to those
> environments.
> I'm not really qualified to take on these jobs myself, but it would be
> great if someone else with the right background who wanted to make a
> name for themselves in this field was able to pick up where Valin left
> off.  (To be clear: we're all very much in his debt.)
> Ken Smith
> Cell: 425-443-2359
> Email: ken at alanta.com <mailto:ken at alanta.com>
> Blog: http://blog.wouldbetheologian.com/
> On Thu, Nov 11, 2010 at 11:02 PM, James Mbuthia <jmmbuthia at gmail.com
> <mailto:jmmbuthia at gmail.com>> wrote:
>     Hi,
>     Just wanted to know, is speex still being developed? I was going
>     through the manual and its dated December 2007 for speex version
>     1.2 beta 3. As far as I can see there doesnt seem to be any new
>     versions since then, is there any development work on speex?
>     regards,
>     James
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