[Speex-dev] Re: [iglance] iGlance audio/video pipeline

Jean-Marc Valin Jean-Marc.Valin at USherbrooke.ca
Sun Nov 27 00:49:11 PST 2005

> 1) Can anyone recommend whether Speex performs better in fixed-point or 
> floating point mode (assuming floating point is supported by the hardware)?

Depends on the architecture. On x86, the float version is about 20-50%

> 2) Does it perform so much better in floating point mode so as to 
> warrant the conversion from short->float?

That's like asking whether using a fast_algorithm() instead of
algorithm() is worth the overhead of the 5 extra characters.

> 3) Has anyone been able to capture audio samples in Win32 in native 
> floating-point format so the conversion can be eliminated?

See above.


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