[Speex-dev] FFTW3 for libspeexdsp

[Thorvald Natvig]

Hi,

Attached is a patch which enables FFTW3 to be used by libspeexdsp. Using 
SSE, the FFT code is more than twice as fast, and it's 50% faster even 
without SSE. To enable the library, you'll need to call configure with 
'--with-gpl-fftw3'.

Based on the benchmarking we did, this also changes the default FFT to 
smallft for floating point implementations when not using FFTW3.

Best regards,
Thorvald

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