ref: 426e6f799cd4153b7e165bb9fccac200f49c2ae2
dir: /src/onset/onset.h/
/*
Copyright (C) 2006-2009 Paul Brossier <piem@aubio.org>
This file is part of aubio.
aubio is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
aubio is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with aubio. If not, see <http://www.gnu.org/licenses/>.
*/
/** \file
Onset detection object
The following routines compute the onset detection function and detect peaks
in these functions. When onsets are found above a given silence threshold,
and after a minimum inter-onset interval, the output vector returned by
::aubio_onset_do is filled with `1`. Otherwise, the output vector remains
`0`.
The peak-picking threshold, the silence threshold, and the minimum
inter-onset interval can be adjusted during the execution of the
aubio_onset_do routine using the corresponding functions.
\example onset/test-onset.c
*/
#ifndef ONSET_H
#define ONSET_H
#ifdef __cplusplus
extern "C" {
#endif
/** onset detection object */
typedef struct _aubio_onset_t aubio_onset_t;
/** create onset detection object
\param method onset detection type as specified in specdesc.h
\param buf_size buffer size for phase vocoder
\param hop_size hop size for phase vocoder
\param samplerate sampling rate of the input signal
*/
aubio_onset_t * new_aubio_onset (char_t * method,
uint_t buf_size, uint_t hop_size, uint_t samplerate);
/** execute onset detection
\param o onset detection object as returned by new_aubio_onset
\param input new audio vector of length hop_size
\param onset output vector, 1 if onset is found, 0 otherwise
*/
void aubio_onset_do (aubio_onset_t *o, fvec_t * input, fvec_t * onset);
/** set onset detection silence threshold
\param o onset detection object as returned by new_aubio_onset
\param silence new silence detection threshold
*/
uint_t aubio_onset_set_silence(aubio_onset_t * o, smpl_t silence);
/** get onset detection function
\param o onset detection object as returned by new_aubio_onset
\return the current value of the descriptor
*/
smpl_t aubio_onset_get_descriptor ( aubio_onset_t *o);
/** get thresholded onset detection function
\param o onset detection object as returned by new_aubio_onset
\return the value of the thresholded descriptor
*/
smpl_t aubio_onset_get_thresholded_descriptor ( aubio_onset_t *o);
/** set onset detection peak picking threshold
\param o onset detection object as returned by new_aubio_onset
\param threshold new peak-picking threshold
*/
uint_t aubio_onset_set_threshold(aubio_onset_t * o, smpl_t threshold);
/** set minimum inter onset interval
\param o onset detection object as returned by new_aubio_onset
\param minioi minimum interval between two consecutive onsets (in
milliseconds)
*/
uint_t aubio_onset_set_minioi(aubio_onset_t * o, uint_t minioi);
/** delete onset detection object
\param o onset detection object to delete
*/
void del_aubio_onset(aubio_onset_t * o);
#ifdef __cplusplus
}
#endif
#endif /* ONSET_H */