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 object
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
31 The peak-picking threshold, the silence threshold, and the minimum
32 inter-onset interval can be adjusted during the execution of the
33 aubio_onset_do routine using the corresponding functions.
35 \example onset/test-onset.c
47 /** onset detection object */
48 typedef struct _aubio_onset_t aubio_onset_t;
50 /** create onset detection object
52 \param method onset detection type as specified in specdesc.h
53 \param buf_size buffer size for phase vocoder
54 \param hop_size hop size for phase vocoder
55 \param samplerate sampling rate of the input signal
58 aubio_onset_t * new_aubio_onset (char_t * method,
59 uint_t buf_size, uint_t hop_size, uint_t samplerate);
61 /** execute onset detection
63 \param o onset detection object as returned by new_aubio_onset
64 \param input new audio vector of length hop_size
65 \param onset output vector, 1 if onset is found, 0 otherwise
68 void aubio_onset_do (aubio_onset_t *o, fvec_t * input, fvec_t * onset);
70 /** get the time of the latest onset detected, in samples
72 \param o onset detection object as returned by new_aubio_onset
75 smpl_t aubio_onset_get_last_onset (aubio_onset_t *o);
77 /** get the time of the latest onset detected, in seconds
79 \param o onset detection object as returned by new_aubio_onset
82 smpl_t aubio_onset_get_last_onset_s (aubio_onset_t *o);
84 /** get the time of the latest onset detected, in milliseconds
86 \param o onset detection object as returned by new_aubio_onset
89 smpl_t aubio_onset_get_last_onset_ms (aubio_onset_t *o);
91 /** set onset detection silence threshold
93 \param o onset detection object as returned by new_aubio_onset
94 \param silence new silence detection threshold
97 uint_t aubio_onset_set_silence(aubio_onset_t * o, smpl_t silence);
99 /** get onset detection function
101 \param o onset detection object as returned by new_aubio_onset
102 \return the current value of the descriptor
105 smpl_t aubio_onset_get_descriptor ( aubio_onset_t *o);
107 /** get thresholded onset detection function
109 \param o onset detection object as returned by new_aubio_onset
110 \return the value of the thresholded descriptor
113 smpl_t aubio_onset_get_thresholded_descriptor ( aubio_onset_t *o);
115 /** set onset detection peak picking threshold
117 \param o onset detection object as returned by new_aubio_onset
118 \param threshold new peak-picking threshold
121 uint_t aubio_onset_set_threshold(aubio_onset_t * o, smpl_t threshold);
123 /** set minimum inter onset interval
125 \param o onset detection object as returned by new_aubio_onset
126 \param minioi minimum interval between two consecutive onsets (in
130 uint_t aubio_onset_set_minioi(aubio_onset_t * o, uint_t minioi);
132 /** delete onset detection object
134 \param o onset detection object to delete
137 void del_aubio_onset(aubio_onset_t * o);