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I'm developing audio player using FFmpeg and OpenAL libraries. I want to add audio equaliqer to my app, but I don't know how to do it. I tried to use OpenAL Equalizer effect extension, but I'm getting "Undefined value" error while initializing it. I found out that I can use Fast Fourier Transformation for creating equalizer. FFmpeg providing FFT functions, but I don't know how to use them with audio samples. Does anybody have any ideas?

Paul R
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Evgeniy Kharchenko
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  • Many questions and answers on this subject already - see e.g. http://stackoverflow.com/questions/5814065/how-to-modify-fft-result-to-equalize-a-music-sample, http://stackoverflow.com/questions/19794692/how-equalize-on-c-after-fft and http://stackoverflow.com/questions/2929401/dsp-filtering-in-the-frequency-domain-via-fft – Paul R Mar 24 '15 at 09:42

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I just fixed some errors in OpenAL to enable equalizer effect and then it works fine.

Evgeniy Kharchenko
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