[Asterisk-Dev] codec configuration thoughts

[James Golovich]

speex.conf would only apply to speex, and not any other codecs.  Thus it
would require some specific code for codec_speex.c, and not just a generic
implementation that would apply to everything else.

James

On Thu, 4 Sep 2003, Brian West wrote:

> James,
> 	speex.conf ?
> 
> bkw
> 
> On Wed, 3 Sep 2003, James Golovich wrote:
> 
> > I've been trying to come up with a way to pass config options to specific
> > codecs (see bug #149) and I haven't run across anything that strikes me as
> > the best way to do it.  So I thought I'd share some of my thoughts and
> > maybe someone else will have some thoughts as well.
> >
> > One idea I had was to allow the setup of codec classes, setup in something
> > like codecs.conf.  Each codec could have a numbered priority, or they
> > could be listed in order of priority.  Hopefully this would make it
> > possible to keep the existing way of handling things, but just add another
> > option.
> >
> > [lowbandwidth]
> > disallow => ulaw
> > disallow => alaw
> > allow => gsm
> > allow => ilbc
> > allow => speex,B8V1a1D1
> > allow => speex,B15
> >
> > The options would hopefully be similar between all codecs, but if its just
> > a string to be passed to the codec then it might make it easy.
> >
> > My hypothetical options:
> > B6 = bitrate of 6kbits/sec (B2, B4, B6, B8, B11, B15, B18, B24 would be
> > valid for speex)
> > v1 = enable variable bit rate
> > a1 = enable average bit rate
> > c2 = set complexity (cpu usage) default is 2 (1-10 is valid)
> > V1 = enable VAD
> > D1 = enable discontinuous transmission
> > p1 = enable perceptual enhancement
> >
> > Then in a user/peers configuration (in iax.conf,sip.conf,etc.) it could
> > have an option like codecclass => lowbandwidth.  In theory there could
> > also be a SetCodecClass application so the class could be changed by
> > extensions.conf
> >
> > I really don't like the way this looks like it would work, but its the
> > best I could come up with.  Hopefully someone will have a better idea
> > about this
> >
> > James
> >
> > _______________________________________________
> > Asterisk-Dev mailing list
> > Asterisk-Dev at lists.digium.com
> > http://lists.digium.com/mailman/listinfo/asterisk-dev
> >
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