| 1 | /* |
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| 2 | Copyright (C) 2003 Matthew Davies and Paul Brossier |
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| 3 | |
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| 4 | This program is free software; you can redistribute it and/or modify |
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| 5 | it under the terms of the GNU General Public License as published by |
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| 6 | the Free Software Foundation; either version 2 of the License, or |
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| 7 | (at your option) any later version. |
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| 8 | |
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| 9 | This program is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 12 | GNU General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU General Public License |
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| 15 | along with this program; if not, write to the Free Software |
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| 16 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 17 | |
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| 18 | */ |
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| 19 | |
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| 20 | /** \file |
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| 21 | |
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| 22 | Beat tracking using a context dependant model |
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| 23 | |
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| 24 | This file implement the causal beat tracking algorithm designed by Matthew |
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| 25 | Davies and described in the following articles: |
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| 26 | |
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| 27 | Matthew E. P. Davies and Mark D. Plumbley. Causal tempo tracking of audio. |
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| 28 | In Proceedings of the International Symposium on Music Information Retrieval |
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| 29 | (ISMIR), pages 164169, Barcelona, Spain, 2004. |
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| 30 | |
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| 31 | Matthew E. P. Davies, Paul Brossier, and Mark D. Plumbley. Beat tracking |
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| 32 | towards automatic musical accompaniment. In Proceedings of the Audio |
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| 33 | Engeeniring Society 118th Convention, Barcelona, Spain, May 2005. |
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| 34 | |
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| 35 | */ |
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| 36 | #ifndef BEATTRACKING_H |
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| 37 | #define BEATTRACKING_H |
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| 38 | |
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| 39 | #ifdef __cplusplus |
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| 40 | extern "C" { |
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| 41 | #endif |
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| 42 | |
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| 43 | /** beat tracking object */ |
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| 44 | typedef struct _aubio_beattracking_t aubio_beattracking_t; |
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| 45 | |
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| 46 | /** create beat tracking object |
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| 47 | |
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| 48 | \param winlen: frame size [512] |
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| 49 | \param channels number (not functionnal) [1] |
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| 50 | |
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| 51 | */ |
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| 52 | aubio_beattracking_t * new_aubio_beattracking(uint_t winlen, uint_t channels); |
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| 53 | /** track the beat |
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| 54 | |
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| 55 | \param bt beat tracking object |
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| 56 | \param dfframes current input detection function frame, smoothed by |
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| 57 | adaptive median threshold. |
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| 58 | \param out stored detected beat locations |
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| 59 | |
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| 60 | */ |
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| 61 | void aubio_beattracking_do(aubio_beattracking_t * bt, fvec_t * dfframes, fvec_t * out); |
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| 62 | /** get current tempo in bpm |
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| 63 | |
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| 64 | \param bt beat tracking object |
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| 65 | |
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| 66 | Returns the currently observed tempo, in beats per minutes, or 0 if no |
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| 67 | consistent value is found. |
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| 68 | |
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| 69 | */ |
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| 70 | smpl_t aubio_beattracking_get_bpm(aubio_beattracking_t * bt); |
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| 71 | /** get current tempo confidence |
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| 72 | |
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| 73 | \param bt beat tracking object |
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| 74 | |
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| 75 | Returns the confidence with which the tempo has been observed, 0 if no |
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| 76 | consistent value is found. |
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| 77 | |
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| 78 | */ |
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| 79 | smpl_t aubio_beattracking_get_confidence(aubio_beattracking_t * bt); |
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| 80 | /** delete beat tracking object |
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| 81 | |
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| 82 | \param p beat tracking object |
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| 83 | |
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| 84 | */ |
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| 85 | void del_aubio_beattracking(aubio_beattracking_t * p); |
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| 86 | |
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| 87 | #ifdef __cplusplus |
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| 88 | } |
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| 89 | #endif |
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| 90 | |
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| 91 | #endif /* BEATTRACKING_H */ |
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