[asterisk-dev] Wideband (G722) MeetMe

[Doken, Serhad]

> -----Original Message-----
> From: asterisk-dev-bounces at lists.digium.com [mailto:asterisk-dev-
> bounces at lists.digium.com] On Behalf Of Kevin P. Fleming
> Sent: Tuesday, June 23, 2009 4:25 PM
> To: Asterisk Developers Mailing List
> Subject: Re: [asterisk-dev] Wideband (G722) MeetMe
> 
> Doken, Serhad wrote:
> 
> > *I asked this on asterisk-users list but did not get a definitive
> > answer. On 1.6.2, does Meet-me bridge support native WB mixing
> (meaning
> > no downscaling to SLIN) for G722 or any other WB codec ? I tried
> 1.6.2
> > Beta3 but it sounded like it was still doing a downgrade to SLIN
> first.*
> 
> This was explained before but you apparently did not understand the
> explanation.
> 
> The MeetMe application will never support anything other than 8kHz
> sampling rates, as it uses DAHDI for audio mixing and DAHDI only
> supports 8kHz audio.

You are assuming that I have seen the explanation before but I haven't.

> 
> In 1.6.2 there is a new ConfBridge application that can provide
> wideband
> audio mixing; you can read the application help to see how to use it.
> As
> far as I am aware, at this time is only supports a single sample rate
> per conference, it cannot support mixed-rate channels in a single
> conference.

I will check it out.

> 
> (Note that 'SLIN' is not necessarily a downgrade from G.722; SLIN is a
> sample format, which can be provided in 8,000, 16,000 or more samples
> per second. When mixing audio, ConfBridge will use SLIN at 16kHz to
> handle wideband channels, since mixing must be done in the linear
> domain)

What I meant by SLIN is 8khz slinear format. For 16Khz, I generally use the SLINEAR16 notation as I see it used in the code.

> 
> --
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> skype: kpfleming | jabber: kpfleming at digium.com
> Check us out at www.digium.com & www.asterisk.org
> 
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