[FFmpeg-devel] [PATCH 1/4] configure: add fftw3 detection

James Almer jamrial at gmail.com
Fri Mar 25 17:32:14 CET 2016

On 3/24/2016 9:50 PM, Ganesh Ajjanagadde wrote:
> Useful for fast FFT computation: http://www.fftw.org/.
> Signed-off-by: Ganesh Ajjanagadde <gajjanag at gmail.com>
> ---
>  configure | 4 ++++
>  1 file changed, 4 insertions(+)

fftw brings nothing we don't already have. It's simply faster in some cases
and slower in others.

Some projects use libavcodec for their FFT needs because of our implementation.
In some cases they switched to another because, as pointed above, we're lacking
assembly optimizations for some codepaths. See ticket #3921.
So instead of giving them more reason to not use our implementation, we should
address its few shortcomings.

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