2 Copyright (C) 2003 Matthew Davies and Paul Brossier
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 Beat tracking using a context dependant model
24 This file implement the causal beat tracking algorithm designed by Matthew
25 Davies and described in the following articles:
27 Matthew E. P. Davies and Mark D. Plumbley. Causal tempo tracking of audio.
28 In Proceedings of the International Symposium on Music Information Retrieval
29 (ISMIR), pages 164169, Barcelona, Spain, 2004.
31 Matthew E. P. Davies, Paul Brossier, and Mark D. Plumbley. Beat tracking
32 towards automatic musical accompaniment. In Proceedings of the Audio
33 Engeeniring Society 118th Convention, Barcelona, Spain, May 2005.
36 #ifndef BEATTRACKING_H
37 #define BEATTRACKING_H
43 /** beat tracking object */
44 typedef struct _aubio_beattracking_t aubio_beattracking_t;
46 /** create beat tracking object
48 \param winlen: frame size [512]
49 \param channels number (not functionnal) [1]
52 aubio_beattracking_t * new_aubio_beattracking(uint_t winlen, uint_t channels);
55 \param bt beat tracking object
56 \param dfframes current input detection function frame, smoothed by
57 adaptive median threshold.
58 \param out stored detected beat locations
61 void aubio_beattracking_do(aubio_beattracking_t * bt, fvec_t * dfframes, fvec_t * out);
62 /** get current tempo in bpm
64 \param bt beat tracking object
66 Returns the currently observed tempo, in beats per minutes, or 0 if no
67 consistent value is found.
70 smpl_t aubio_beattracking_get_bpm(aubio_beattracking_t * bt);
71 /** get current tempo confidence
73 \param bt beat tracking object
75 Returns the confidence with which the tempo has been observed, 0 if no
76 consistent value is found.
79 smpl_t aubio_beattracking_get_confidence(aubio_beattracking_t * bt);
80 /** delete beat tracking object
82 \param p beat tracking object
85 void del_aubio_beattracking(aubio_beattracking_t * p);
91 #endif /* BEATTRACKING_H */