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e to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #ifndef _FFT_H_ #define _FFT_H_ #define FFT_BUFFER_SIZE_LOG 9 #define FFT_BUFFER_SIZE (1 << FFT_BUFFER_SIZE_LOG) /* sound sample - should be an signed 16 bit value */ typedef short int sound_sample; #ifdef __cplusplus extern "C" { #endif /* FFT library */ typedef struct _struct_fft_state fft_state; fft_state *fft_init(void); void fft_perform(const sound_sample * input, float *output, fft_state * state); void fft_close(fft_state * state); #ifdef __cplusplus } #endif #endif /* _FFT_H_ */