[Speex-dev] Cpu bandwidth for Speex on Win32 platforms

Jay Huang jhuang at tjnet.com
Wed Oct 6 12:57:59 PDT 2004

Hi,  Matthias:

Thanks your quick reply.

My current speex setting is :

sample_rate = 8000;    // hardware sample_rate also matches 8000 hz
complexity=2;        // for encoder

Is there anything I can try? 

By the way, how can I know the version number of my speex source code? 
Is there a CVS repository that I can access?



----- Original Message ----- 
From: "Matthias Granberry" <matthias at utdallas.edu>
To: "Jay Huang" <jhuang at tjnet.com>
Cc: <speex-dev at xiph.org>
Sent: Wednesday, October 06, 2004 12:35 PM
Subject: Re: [Speex-dev] Cpu bandwidth for Speex on Win32 platforms

> I have two guesses: The sampling rate will effect speex, as will the
> complexity setting on the encoder.  A decrease in either of these will
> speed speex up.  It probably won't get you to G723.1 speeds, but it
> isn't supposed to either.  Speex is pretty high on the codec
> food-chain as far as CPU usage goes.  There is some SSE assembly
> language, but it's in GCC/AT&T syntax rather than the windows-standard
> Intel syntax, so you might have to do some of your own translation to
> something your compiler understands.
> "Jay Huang" <jhuang at tjnet.com> writes:
> > Hi,
> >
> > I try to use Speex codec into Win32 platforms. However, I find the CPU
> > bandwidth usage is very heavy on a Pentium 3 machine. Compare to
> > Microsoft's G723.1 codec, speex 8k is using more than 20% cpu
> > bandwidth.
> >
> > Does anyone know what is the best version of Speex to "beat" the
> > Microsoft's G723.1's on CPU bandwidth usage? Does Speex have
> > MMX-enabled codes?
> >
> > Thanks very much,
> >
> > Jay
> -- 
> Matthias Granberry
> matthias at utdallas.edu
> (972)644-3580

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