/usr/include/libvisual-0.4/libvisual/lv_fourier.h is in libvisual-0.4-dev 0.4.0-11.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 | /* Libvisual - The audio visualisation framework.
*
* Copyright (C) 2004, 2005, 2006 Dennis Smit <ds@nerds-incorporated.org>
*
* Authors: Dennis Smit <ds@nerds-incorporated.org>
* Chong Kai Xiong <descender@phreaker.net>
*
* $Id: lv_fourier.h,v 1.8 2006/01/22 13:23:37 synap Exp $
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _LV_FOURIER_H
#define _LV_FOURIER_H
#include <libvisual/lv_common.h>
VISUAL_BEGIN_DECLS
#define VISUAL_DFT(obj) (VISUAL_CHECK_CAST ((obj), VisDFT))
typedef struct _VisDFT VisDFT;
/**
* Private structure to embed Fourier Transform states in.
*/
struct _VisDFT {
VisObject object; /**< The VisObject data. */
unsigned int samples_in; /**< The number of input samples. */
unsigned int spectrum_size; /**< The size of the spectrum (power of two). */
float *real; /**< Private data that is used by the fourier engine. */
float *imag; /**< Private data that is used by the fourier engine. */
int brute_force; /**< Private data that is used by the fourier engine. */
};
/* prototypes */
int visual_fourier_initialize (void);
int visual_fourier_is_initialized (void);
int visual_fourier_deinitialize (void);
VisDFT *visual_dft_new (unsigned int samples_out, unsigned int samples_in);
int visual_dft_init (VisDFT *fourier, unsigned int samples_out, unsigned int samples_in);
int visual_dft_perform (VisDFT *fourier, float *output, float *input);
int visual_dft_log_scale (float *output, float *input, int size);
int visual_dft_log_scale_standard (float *output, float *input, int size);
int visual_dft_log_scale_custom (float *output, float *input, int size, float log_scale_divisor);
VISUAL_END_DECLS
#endif /* _LV_FOURIER_H */
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