/* fft/gsl_fft_complex_float.h

 * 

 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough

 * 

 * 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 3 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 __GSL_FFT_COMPLEX_FLOAT_H__

#define __GSL_FFT_COMPLEX_FLOAT_H__

#include <stddef.h>

#include <gsl/gsl_math.h>

#include <gsl/gsl_complex.h>

#include <gsl/gsl_fft.h>

#undef __BEGIN_DECLS

#undef __END_DECLS

#ifdef __cplusplus

# define __BEGIN_DECLS extern "C" {

# define __END_DECLS }

#else

# define __BEGIN_DECLS /* empty */

# define __END_DECLS /* empty */

#endif

__BEGIN_DECLS

/*  Power of 2 routines  */

int gsl_fft_complex_float_radix2_forward (gsl_complex_packed_array_float data,

                                          const size_t stride,

                                          const size_t n);

int gsl_fft_complex_float_radix2_backward (gsl_complex_packed_array_float data,

                                           const size_t stride,

                                           const size_t n);

int gsl_fft_complex_float_radix2_inverse (gsl_complex_packed_array_float data,

                                          const size_t stride,

                                          const size_t n);

int gsl_fft_complex_float_radix2_transform (gsl_complex_packed_array_float data,

                                            const size_t stride,

                                            const size_t n,

                                            const gsl_fft_direction sign);

int gsl_fft_complex_float_radix2_dif_forward (gsl_complex_packed_array_float data,

                                              const size_t stride,

                                              const size_t n);

int gsl_fft_complex_float_radix2_dif_backward (gsl_complex_packed_array_float data,

                                               const size_t stride,

                                               const size_t n);

int gsl_fft_complex_float_radix2_dif_inverse (gsl_complex_packed_array_float data,

                                              const size_t stride,

                                              const size_t n);

int gsl_fft_complex_float_radix2_dif_transform (gsl_complex_packed_array_float data,

                                                const size_t stride,

                                                const size_t n,

                                                const gsl_fft_direction sign);

/*  Mixed Radix general-N routines  */

typedef struct

  {

    size_t n;

    size_t nf;

    size_t factor[64];

    gsl_complex_float *twiddle[64];

    gsl_complex_float *trig;

  }

gsl_fft_complex_wavetable_float;

typedef struct

{

    size_t n;

    float *scratch;

}

gsl_fft_complex_workspace_float;

gsl_fft_complex_wavetable_float *gsl_fft_complex_wavetable_float_alloc (size_t n);

void gsl_fft_complex_wavetable_float_free (gsl_fft_complex_wavetable_float * wavetable);

gsl_fft_complex_workspace_float *gsl_fft_complex_workspace_float_alloc (size_t n);

void gsl_fft_complex_workspace_float_free (gsl_fft_complex_workspace_float * workspace);

int gsl_fft_complex_float_memcpy (gsl_fft_complex_wavetable_float * dest,

                               gsl_fft_complex_wavetable_float * src);

int gsl_fft_complex_float_forward (gsl_complex_packed_array_float data,

                                   const size_t stride,

                                   const size_t n,

                                   const gsl_fft_complex_wavetable_float * wavetable,

                                   gsl_fft_complex_workspace_float * work);

int gsl_fft_complex_float_backward (gsl_complex_packed_array_float data,

                                    const size_t stride,

                                    const size_t n,

                                    const gsl_fft_complex_wavetable_float * wavetable,

                                    gsl_fft_complex_workspace_float * work);

int gsl_fft_complex_float_inverse (gsl_complex_packed_array_float data,

                                   const size_t stride,

                                   const size_t n,

                                   const gsl_fft_complex_wavetable_float * wavetable,

                                   gsl_fft_complex_workspace_float * work);

int gsl_fft_complex_float_transform (gsl_complex_packed_array_float data,

                                     const size_t stride, const size_t n,

                                     const gsl_fft_complex_wavetable_float * wavetable,

                                     gsl_fft_complex_workspace_float * work,

                                     const gsl_fft_direction sign);

__END_DECLS

#endif /* __GSL_FFT_COMPLEX_FLOAT_H__ */