1 | /* |
---|
2 | Copyright (C) 2003-2013 Paul Brossier <piem@aubio.org> |
---|
3 | |
---|
4 | This file is part of aubio. |
---|
5 | |
---|
6 | aubio is free software: you can redistribute it and/or modify |
---|
7 | it under the terms of the GNU General Public License as published by |
---|
8 | the Free Software Foundation, either version 3 of the License, or |
---|
9 | (at your option) any later version. |
---|
10 | |
---|
11 | aubio is distributed in the hope that it will be useful, |
---|
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
14 | GNU General Public License for more details. |
---|
15 | |
---|
16 | You should have received a copy of the GNU General Public License |
---|
17 | along with aubio. If not, see <http://www.gnu.org/licenses/>. |
---|
18 | |
---|
19 | */ |
---|
20 | |
---|
21 | /** \file |
---|
22 | |
---|
23 | Phase vocoder object |
---|
24 | |
---|
25 | This object implements a phase vocoder. The spectral frames are computed |
---|
26 | using a HanningZ window and a swapped version of the signal to simplify the |
---|
27 | phase relationships across frames. The window sizes and overlap are specified |
---|
28 | at creation time. |
---|
29 | |
---|
30 | \example spectral/test-phasevoc.c |
---|
31 | |
---|
32 | */ |
---|
33 | |
---|
34 | #ifndef AUBIO_PHASEVOC_H |
---|
35 | #define AUBIO_PHASEVOC_H |
---|
36 | |
---|
37 | #ifdef __cplusplus |
---|
38 | extern "C" { |
---|
39 | #endif |
---|
40 | |
---|
41 | /** phasevocoder object */ |
---|
42 | typedef struct _aubio_pvoc_t aubio_pvoc_t; |
---|
43 | |
---|
44 | /** create phase vocoder object |
---|
45 | |
---|
46 | \param win_s size of analysis buffer (and length the FFT transform) |
---|
47 | \param hop_s step size between two consecutive analysis |
---|
48 | |
---|
49 | */ |
---|
50 | aubio_pvoc_t * new_aubio_pvoc (uint_t win_s, uint_t hop_s); |
---|
51 | /** delete phase vocoder object |
---|
52 | |
---|
53 | \param pv phase vocoder object as returned by new_aubio_pvoc |
---|
54 | |
---|
55 | */ |
---|
56 | void del_aubio_pvoc(aubio_pvoc_t *pv); |
---|
57 | |
---|
58 | /** compute spectral frame |
---|
59 | |
---|
60 | This function accepts an input vector of size [hop_s]. The |
---|
61 | analysis buffer is rotated and filled with the new data. After windowing of |
---|
62 | this signal window, the Fourier transform is computed and returned in |
---|
63 | fftgrain as two vectors, magnitude and phase. |
---|
64 | |
---|
65 | \param pv phase vocoder object as returned by new_aubio_pvoc |
---|
66 | \param in new input signal (hop_s long) |
---|
67 | \param fftgrain output spectral frame |
---|
68 | |
---|
69 | */ |
---|
70 | void aubio_pvoc_do(aubio_pvoc_t *pv, const fvec_t *in, cvec_t * fftgrain); |
---|
71 | /** compute signal from spectral frame |
---|
72 | |
---|
73 | This function takes an input spectral frame fftgrain of size |
---|
74 | [buf_s] and computes its inverse Fourier transform. Overlap-add |
---|
75 | synthesis is then computed using the previously synthetised frames, and the |
---|
76 | output stored in out. |
---|
77 | |
---|
78 | \param pv phase vocoder object as returned by new_aubio_pvoc |
---|
79 | \param fftgrain input spectral frame |
---|
80 | \param out output signal (hop_s long) |
---|
81 | |
---|
82 | */ |
---|
83 | void aubio_pvoc_rdo(aubio_pvoc_t *pv, cvec_t * fftgrain, fvec_t *out); |
---|
84 | |
---|
85 | /** get window size |
---|
86 | |
---|
87 | \param pv phase vocoder to get the window size from |
---|
88 | |
---|
89 | */ |
---|
90 | uint_t aubio_pvoc_get_win(aubio_pvoc_t* pv); |
---|
91 | /** get hop size |
---|
92 | |
---|
93 | \param pv phase vocoder to get the hop size from |
---|
94 | |
---|
95 | */ |
---|
96 | uint_t aubio_pvoc_get_hop(aubio_pvoc_t* pv); |
---|
97 | |
---|
98 | #ifdef __cplusplus |
---|
99 | } |
---|
100 | #endif |
---|
101 | |
---|
102 | #endif /* AUBIO_PHASEVOC_H */ |
---|