This file is indexed.

/usr/include/aubio/spectral/fft.h is in libaubio-dev 0.4.1-2+b2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
/*
  Copyright (C) 2003-2013 Paul Brossier <piem@aubio.org>

  This file is part of aubio.

  aubio 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.

  aubio 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 aubio.  If not, see <http://www.gnu.org/licenses/>.

*/

/** \file 

  Fast Fourier Transform

  Depending on how aubio was compiled, FFT are computed using one of:
    - [Ooura](http://www.kurims.kyoto-u.ac.jp/~ooura/fft.html)
    - [FFTW3](http://www.fftw.org)
    - [vDSP](https://developer.apple.com/library/mac/#documentation/Accelerate/Reference/vDSPRef/Reference/reference.html)

  \example src/spectral/test-fft.c

*/

#ifndef _AUBIO_FFT_H
#define _AUBIO_FFT_H

#ifdef __cplusplus
extern "C" {
#endif

/** FFT object
 
  This object computes forward and backward FFTs.

*/
typedef struct _aubio_fft_t aubio_fft_t;

/** create new FFT computation object

  \param size length of the FFT

*/
aubio_fft_t * new_aubio_fft (uint_t size);
/** delete FFT object 

  \param s fft object as returned by new_aubio_fft

*/
void del_aubio_fft(aubio_fft_t * s);

/** compute forward FFT

  \param s fft object as returned by new_aubio_fft
  \param input input signal 
  \param spectrum output spectrum 

*/
void aubio_fft_do (aubio_fft_t *s, fvec_t * input, cvec_t * spectrum);
/** compute backward (inverse) FFT

  \param s fft object as returned by new_aubio_fft
  \param spectrum input spectrum 
  \param output output signal 

*/
void aubio_fft_rdo (aubio_fft_t *s, cvec_t * spectrum, fvec_t * output);

/** compute forward FFT

  \param s fft object as returned by new_aubio_fft
  \param input real input signal 
  \param compspec complex output fft real/imag

*/
void aubio_fft_do_complex (aubio_fft_t *s, fvec_t * input, fvec_t * compspec);
/** compute backward (inverse) FFT from real/imag

  \param s fft object as returned by new_aubio_fft
  \param compspec real/imag input fft array 
  \param output real output array 

*/
void aubio_fft_rdo_complex (aubio_fft_t *s, fvec_t * compspec, fvec_t * output);

/** convert real/imag spectrum to norm/phas spectrum 

  \param compspec real/imag input fft array 
  \param spectrum cvec norm/phas output array 

*/
void aubio_fft_get_spectrum(fvec_t * compspec, cvec_t * spectrum);
/** convert real/imag spectrum to norm/phas spectrum 

  \param compspec real/imag input fft array 
  \param spectrum cvec norm/phas output array 

*/
void aubio_fft_get_realimag(cvec_t * spectrum, fvec_t * compspec);

/** compute phas spectrum from real/imag parts 

  \param compspec real/imag input fft array 
  \param spectrum cvec norm/phas output array 

*/
void aubio_fft_get_phas(fvec_t * compspec, cvec_t * spectrum);
/** compute imaginary part from the norm/phas cvec 

  \param spectrum norm/phas input array 
  \param compspec real/imag output fft array 

*/
void aubio_fft_get_imag(cvec_t * spectrum, fvec_t * compspec);

/** compute norm component from real/imag parts 

  \param compspec real/imag input fft array 
  \param spectrum cvec norm/phas output array 

*/
void aubio_fft_get_norm(fvec_t * compspec, cvec_t * spectrum);
/** compute real part from norm/phas components 

  \param spectrum norm/phas input array 
  \param compspec real/imag output fft array 

*/
void aubio_fft_get_real(cvec_t * spectrum, fvec_t * compspec);

#ifdef __cplusplus
}
#endif

#endif /* _AUBIO_FFT_H */