[asterisk-users] Use the NEW ulaw/alaw codecs (slower, but cleaner)

Steve Murphy murf at digium.com
Tue Nov 11 17:44:45 CST 2008

On Tue, 2008-11-11 at 16:11 -0700, Wilton Helm wrote:
> I'm a bit puzzled, also, having implemented ulaw and alaw in an
> embedded application.  Each can be done with a 16 Kbyte table in about
> 0 time with no errors.  There are probably tricks that will cut the
> table down by 2 or 4 X for a small cost in CPU cycles.  The inverse
> requires 256 16 bit words.  I thought ulaw and alaw were pretty much
> no brainers.  I don't know of any gottchas.  Why anyone with more that
> a few K bytes of total system memory would even consider anything
> other than a lookup table is beyond me.
> Wilton


AFAIK, the current algorithms (old & new) are indeed table lookup.
It wouldn't hurt for you to do a code review on them, you might
be able to improve them...!


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Steve Murphy
Software Developer
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