| 1 | /* |
|---|
| 2 | Copyright (C) 2003 Matthew Davies and Paul Brossier |
|---|
| 3 | |
|---|
| 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. |
|---|
| 8 | |
|---|
| 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. |
|---|
| 13 | |
|---|
| 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. |
|---|
| 17 | |
|---|
| 18 | */ |
|---|
| 19 | |
|---|
| 20 | /** \file |
|---|
| 21 | |
|---|
| 22 | Beat tracking using a context dependant model |
|---|
| 23 | |
|---|
| 24 | This file implements the causal beat tracking algorithm designed by Matthew |
|---|
| 25 | Davies and described in the following articles: |
|---|
| 26 | |
|---|
| 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. |
|---|
| 30 | |
|---|
| 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. |
|---|
| 34 | |
|---|
| 35 | */ |
|---|
| 36 | #ifndef BEATTRACKING_H |
|---|
| 37 | #define BEATTRACKING_H |
|---|
| 38 | |
|---|
| 39 | #ifdef __cplusplus |
|---|
| 40 | extern "C" { |
|---|
| 41 | #endif |
|---|
| 42 | |
|---|
| 43 | /** beat tracking object */ |
|---|
| 44 | typedef struct _aubio_beattracking_t aubio_beattracking_t; |
|---|
| 45 | |
|---|
| 46 | /** create beat tracking object |
|---|
| 47 | |
|---|
| 48 | \param winlen: frame size [512] |
|---|
| 49 | \param channels number (not functionnal) [1] |
|---|
| 50 | |
|---|
| 51 | */ |
|---|
| 52 | aubio_beattracking_t * new_aubio_beattracking(uint_t winlen, uint_t channels); |
|---|
| 53 | /** track the beat |
|---|
| 54 | |
|---|
| 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 |
|---|
| 59 | |
|---|
| 60 | */ |
|---|
| 61 | void aubio_beattracking_do(aubio_beattracking_t * bt, fvec_t * dfframes, fvec_t * out); |
|---|
| 62 | /** get current tempo in bpm |
|---|
| 63 | |
|---|
| 64 | \param bt beat tracking object |
|---|
| 65 | |
|---|
| 66 | Returns the currently observed tempo, in beats per minutes, or 0 if no |
|---|
| 67 | consistent value is found. |
|---|
| 68 | |
|---|
| 69 | */ |
|---|
| 70 | smpl_t aubio_beattracking_get_bpm(aubio_beattracking_t * bt); |
|---|
| 71 | /** get current tempo confidence |
|---|
| 72 | |
|---|
| 73 | \param bt beat tracking object |
|---|
| 74 | |
|---|
| 75 | Returns the confidence with which the tempo has been observed, 0 if no |
|---|
| 76 | consistent value is found. |
|---|
| 77 | |
|---|
| 78 | */ |
|---|
| 79 | smpl_t aubio_beattracking_get_confidence(aubio_beattracking_t * bt); |
|---|
| 80 | /** delete beat tracking object |
|---|
| 81 | |
|---|
| 82 | \param p beat tracking object |
|---|
| 83 | |
|---|
| 84 | */ |
|---|
| 85 | void del_aubio_beattracking(aubio_beattracking_t * p); |
|---|
| 86 | |
|---|
| 87 | #ifdef __cplusplus |
|---|
| 88 | } |
|---|
| 89 | #endif |
|---|
| 90 | |
|---|
| 91 | #endif /* BEATTRACKING_H */ |
|---|
