2 Copyright (C) 2003-2009 Matthew Davies and Paul Brossier <piem@aubio.org>
4 This file is part of aubio.
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.
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.
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/>.
23 Beat tracking using a context dependant model
25 This file implements the causal beat tracking algorithm designed by Matthew
26 Davies and described in the following articles:
28 Matthew E. P. Davies and Mark D. Plumbley. Causal tempo tracking of audio.
29 In Proceedings of the International Symposium on Music Information Retrieval
30 (ISMIR), pages 164169, Barcelona, Spain, 2004.
32 Matthew E. P. Davies, Paul Brossier, and Mark D. Plumbley. Beat tracking
33 towards automatic musical accompaniment. In Proceedings of the Audio
34 Engeeniring Society 118th Convention, Barcelona, Spain, May 2005.
37 #ifndef BEATTRACKING_H
38 #define BEATTRACKING_H
44 /** beat tracking object */
45 typedef struct _aubio_beattracking_t aubio_beattracking_t;
47 /** create beat tracking object
49 \param winlen: frame size [512]
50 \param channels number (not functionnal) [1]
53 aubio_beattracking_t * new_aubio_beattracking(uint_t winlen, uint_t channels);
56 \param bt beat tracking object
57 \param dfframes current input detection function frame, smoothed by
58 adaptive median threshold.
59 \param out stored detected beat locations
62 void aubio_beattracking_do(aubio_beattracking_t * bt, fvec_t * dfframes, fvec_t * out);
63 /** get current tempo in bpm
65 \param bt beat tracking object
67 Returns the currently observed tempo, in beats per minutes, or 0 if no
68 consistent value is found.
71 smpl_t aubio_beattracking_get_bpm(aubio_beattracking_t * bt);
72 /** get current tempo confidence
74 \param bt beat tracking object
76 Returns the confidence with which the tempo has been observed, 0 if no
77 consistent value is found.
80 smpl_t aubio_beattracking_get_confidence(aubio_beattracking_t * bt);
81 /** delete beat tracking object
83 \param p beat tracking object
86 void del_aubio_beattracking(aubio_beattracking_t * p);
92 #endif /* BEATTRACKING_H */