2 Copyright (C) 2006-2009 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 Onset detection driver
25 The following routines compute the onset detection function and detect peaks
26 in these functions. When onsets are found above a given silence threshold,
27 and after a minimum inter-onset interval, the output vector returned by
28 aubio_onset_do is filled with 1. Otherwise, the output vector remains 0.
30 The peak-picking threshold, the silence threshold, and the minimum
31 inter-onset interval can be adjusted during the execution of the
32 aubio_onset_do routine using the corresponding functions.
44 /** onset detection object */
45 typedef struct _aubio_onset_t aubio_onset_t;
47 /** create onset detection object
49 \param method onset detection type as specified in specdesc.h
50 \param buf_size buffer size for phase vocoder
51 \param hop_size hop size for phase vocoder
52 \param channels number of channels
53 \param samplerate sampling rate of the input signal
56 aubio_onset_t * new_aubio_onset (char_t * method,
57 uint_t buf_size, uint_t hop_size, uint_t channels, uint_t samplerate);
59 /** execute onset detection
61 \param o onset detection object as returned by new_aubio_onset
62 \param input new audio vector of length hop_size
63 \param onset output vector, 1 if onset is found, 0 otherwise
66 void aubio_onset_do (aubio_onset_t *o, fvec_t * input, fvec_t * onset);
68 /** set onset detection silence threshold
70 \param o onset detection object as returned by new_aubio_onset
71 \param silence new silence detection threshold
74 uint_t aubio_onset_set_silence(aubio_onset_t * o, smpl_t silence);
76 /** set onset detection peak picking threshold
78 \param o onset detection object as returned by new_aubio_onset
79 \param threshold new peak-picking threshold
82 uint_t aubio_onset_set_threshold(aubio_onset_t * o, smpl_t threshold);
84 /** set minimum inter onset interval
86 \param o onset detection object as returned by new_aubio_onset
87 \param minioi minimum interval between two consecutive onsets (in
91 uint_t aubio_onset_set_minioi(aubio_onset_t * o, uint_t minioi);
93 /** delete onset detection object
95 \param o onset detection object to delete
98 void del_aubio_onset(aubio_onset_t * o);