[Asterisk-Dev] [patch] Choppy dial tone on Linksys routers / FPU usage in indications.c

[Mike Taht]

On 10/2/05, Andreas Klöckner <lists at informa.tiker.net> wrote:
>
> Hi there,
>
> here's a patch that switches tone generation in indications.c over from
> using
> actual floating point code to using a pregenerated sine table. This patch
> allows my poor FPU-less Linksys router to successfully play a dialtone
> with
> almost zero CPU usage.
>
> (If you care about the details: Generating the 8000-entry sine table at
> startup takes a bit more than a second on that machine, which is a MIPS
> using
> an FPU emulator. Since each sample out of playtones_generator() takes two
> sine evaluations and we're sampling at 8000Hz, the Linksys is too slow by
> about a factor of two.)
>
> This might even save some cycles on bigger setups. The patch applies
> cleanly
> and works on 1.0.x with x>=7, on 1.2.x it needs to be told where
> asterisk.h
> is, but otherwise seems to work fine.


Applause!

Dialtone generation is also a problem on even a 500 Mhz Xscale (which is
also fpu-less)

Andreas
>
>
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--
Mike Taht
PostCards From the Bleeding Edge
http://the-edge.blogspot.com
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