[speex-dev] Real time audio encoding - cpu usage

[Bjoern Rasmussen]

Hello Jean-Marc

>If you want to do it, I can show you
>what functions (there are 2-3) to port. Otherwise I might do it
>eventually, but it's not a top priority (there's already an SSE version
>though).

I would indeed like to know which functions can be used to improve K6-2 
performance through 3DNow.

Cheers

Bjoern D. Rasmussen

<p><p><p>>From: Jean-Marc Valin <jean-marc.valin at hermes.usherb.ca>
>Reply-To: speex-dev at xiph.org
>To: speex <speex-dev at xiph.org>
>CC: "Bjoern D. Rasmussen" <bjoern_rasmussen at hotmail.com>
>Subject: Re: [speex-dev] Real time audio encoding - cpu usage
>Date: Mon, 02 Dec 2002 19:54:25 -0500
>
> > I've developed a p2p voice application using Speex and I'm looking for 
>ways
> > to reduce Speex's cpu usage. My K6-2 300 MHz can't even encode 16 bit 
>audio
> > at 16KHz in realtime using Speex in narrowband mode. I've tried to lower 
>the
> > quality to 2 and complexity to 2 also but it's still way too slow.
> > Which other ways are there to make encoding faster? Is there a 
>3DNow-port of
> > Speex?
>
>Well, first if you need to encode 16 kHz speech, you need to use
>wideband (narrowband is for 8 kHZ). At -w --quality 5 --comp 1 I can
>encode in real-time on my PIII 1 GHz with 5% CPU. I know that the K6-II
>x87 FPU is notoriously slow, but I didn't think it was *that* slow. The
>setting I gave you might help, otherwise a 3DNow!-port would probably
>make the code 2-3 times faster. If you want to do it, I can show you
>what functions (there are 2-3) to port. Otherwise I might do it
>eventually, but it's not a top priority (there's already an SSE version
>though).
>
>	Jean-Marc
>
>--
>Jean-Marc Valin, M.Sc.A.
>LABORIUS (http://www.gel.usherb.ca/laborius)
>Université de Sherbrooke, Québec, Canada
><< signature.asc >>

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