[Speex-dev] Speex development

Clifton Craig clifton.craig at gmail.com
Sat Nov 13 09:40:24 PST 2010

For what it's worth, I've been working on my Speex on iPhone series on  
my blog. I'm currently half thru part two and I've uploaded a checkout  
of Speex-1.2rc1 that includes an XCode iPhone project that compiles.  
If someone want to grab what I have and consider adding it to the  
official project feel free to do so. See the 1st URL in my signature  
to find my blog.

Clifton Craig
clifton.craig at gmail.com
aim: cliftoncraig07

On Nov 12, 2010, at 7:34 AM, Jean-Marc Valin wrote:

> 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.
>     Jean-Marc
> 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
>> Blog: http://blog.wouldbetheologian.com/
>> On Thu, Nov 11, 2010 at 11:02 PM, James Mbuthia  
>> <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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