musiclight2/fft.h
2013-02-02 21:54:53 +01:00

24 lines
775 B
C

/*
* vim: sw=2 ts=2 expandtab
*
* "THE PIZZA-WARE LICENSE" (derived from "THE BEER-WARE LICENCE"):
* Thomas Kolb <cfr34k@tkolb.de> wrote this file. As long as you retain this
* notice you can do whatever you want with this stuff. If we meet some day,
* and you think this stuff is worth it, you can buy me a pizza in return.
* - Thomas Kolb
*/
#ifndef FFT_H
#define FFT_H
#include "config.h"
void init_fft(void);
void complex_to_absolute(value_type *re, value_type *im, value_type *result);
void apply_hanning(sample *dftinput);
void fft_transform(sample *samples, value_type *resultRe, value_type *resultIm);
uint32_t find_loudest_frequency(value_type *absFFT);
value_type get_energy_in_band(value_type *fft, uint32_t minFreq, uint32_t maxFreq);
#endif // FFT_H