[Asterisk-Dev] codec configuration thoughts

[Brian West]

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
>
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