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#define NUMBER_OF_COLUMNS 8
#define NUMBER_OF_POINTS (1<<NUMBER_OF_COLUMNS)
#define NUMBER_OF_FREQUENCIES (NUMBER_OF_POINTS>>1)
#define WINDOW_SIZE (NUMBER_OF_POINTS>>2)
#if HARDWARE_MULTIPLY
/*
* This routine obtains the audio data from the audio I/O component and copies this
* data to local arrays for calculating purposes, and calls the FFT algorithm.
*/
void perform_fft(signed 18 *pcm_audio);
/* This routine calls the ifft algorithm and after completing that it obtains the
* modified audio data and copies that to the output arrays of the audio I/O component.
* Besides that it also fills the array used by the display routine for displaying the waveform.
*/
void perform_ifft(signed 18 *modified_audio ,unsigned 6 *ifft_info);
#else
/*
* This routine obtains the audio data from the audio I/O component and copies this
* data to local arrays for calculating purposes, and calls the FFT algorithm.
*/
void perform_fft(signed 16 *pcm_audio);
/* This routine calls the ifft algorithm and after completing that it obtains the
* modified audio data and copies that to the output arrays of the audio I/O component.
* Besides that it also fills the array used by the display routine for displaying the waveform.
*/
void perform_ifft(signed 16 *modified_audio ,unsigned 6 *ifft_info);
#endif
/* This routine equalizes the frequencies derived by the FFT calculation,
* according to the settings of the equalizer bars.
*/
void equalize_audio(audiodata_t *audiodata);
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