But thats raw PCM that its mixing together.  I don't think you can directly mix 
A Law audio without first taking it to Signed Linear.

/b

On Jun 29, 2010, at 8:29 AM, Steven Ayre wrote:

> See the source of src/mod/applications/mod_conference/mod_conference.c, 
> function conference_thread_run
> 
> It reads frames from each of the participants and manually combines them all 
> to form a mux frame, which is then sent to all participants. This is done 
> using the internal audio representation (possibly L16). So even where 
> everyone is using the same codec, e.g. PCMA, there's transcoding going on.
> 
> I don't know any way to achieve what you want at the moment, but someone else 
> might. You should be able to write you own module to do it too though.
> 
> -Steve


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