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/* fft.h: Header for iterative implementation of a FFT
* Copyright (C) 1999 Richard Boulton <richard@tartarus.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write 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_ */
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