ref: c6c20bedb19c749b0079dde002eca818a7edf46a
dir: /src/onset/onset.h/
/*
Copyright (C) 2006-2013 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
\example examples/aubioonset.c
\example examples/aubionotes.c
*/
#ifndef AUBIO_ONSET_H
#define AUBIO_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
\return newly created ::aubio_onset_t
*/
aubio_onset_t * new_aubio_onset (const 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 of length 1, containing 0 if no onset was found,
and a value equal or greater than 1 otherwise
When no onset was detected, the first element of the output vector `onset`
is set to 0.
When an onset is found, the first element of the output vector `onset` is set
to `offset = 1 + a` where `a` is a number in the range`[0, 1]`.
The final onset detection time, in samples, can be obtained with
aubio_onset_get_last(). It can also be derived from `offset` as
follows:
\code
t = total_frames + offset * hop_size - delay
\endcode
where `total_frames` is the total number of frames processed so far, and
`delay` is the current delay of the onset object, as returned by
aubio_onset_get_delay().
*/
void aubio_onset_do (aubio_onset_t *o, const fvec_t * input, fvec_t * onset);
/** get the time of the latest onset detected, in samples
\param o onset detection object as returned by new_aubio_onset()
\return onset detection timestamps (in samples)
*/
uint_t aubio_onset_get_last (const aubio_onset_t *o);
/** get the time of the latest onset detected, in seconds
\param o onset detection object as returned by new_aubio_onset()
\return onset detection timestamps (in seconds)
*/
smpl_t aubio_onset_get_last_s (const aubio_onset_t *o);
/** get the time of the latest onset detected, in milliseconds
\param o onset detection object as returned by new_aubio_onset()
\return onset detection timestamps (in milliseconds)
*/
smpl_t aubio_onset_get_last_ms (const aubio_onset_t *o);
/** 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 silence threshold
\param o onset detection object as returned by new_aubio_onset()
\return current silence threshold
*/
smpl_t aubio_onset_get_silence(const aubio_onset_t * o);
/** 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 (const 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 (const 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 in samples
\param o onset detection object as returned by new_aubio_onset()
\param minioi minimum interval between two consecutive onsets (in
samples)
*/
uint_t aubio_onset_set_minioi(aubio_onset_t * o, uint_t minioi);
/** set minimum inter onset interval in seconds
\param o onset detection object as returned by new_aubio_onset()
\param minioi minimum interval between two consecutive onsets (in
seconds)
*/
uint_t aubio_onset_set_minioi_s(aubio_onset_t * o, smpl_t minioi);
/** set minimum inter onset interval in milliseconds
\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_ms(aubio_onset_t * o, smpl_t minioi);
/** set delay in samples
\param o onset detection object as returned by new_aubio_onset()
\param delay constant system delay to take back from detection time
(in samples)
*/
uint_t aubio_onset_set_delay(aubio_onset_t * o, uint_t delay);
/** set delay in seconds
\param o onset detection object as returned by new_aubio_onset()
\param delay constant system delay to take back from detection time
(in seconds)
*/
uint_t aubio_onset_set_delay_s(aubio_onset_t * o, smpl_t delay);
/** set delay in milliseconds
\param o onset detection object as returned by new_aubio_onset()
\param delay constant system delay to take back from detection time
(in milliseconds)
*/
uint_t aubio_onset_set_delay_ms(aubio_onset_t * o, smpl_t delay);
/** get minimum inter onset interval in samples
\param o onset detection object as returned by new_aubio_onset()
\return minimum interval between two consecutive onsets (in
samples)
*/
uint_t aubio_onset_get_minioi(const aubio_onset_t * o);
/** get minimum inter onset interval in seconds
\param o onset detection object as returned by new_aubio_onset()
\return minimum interval between two consecutive onsets (in
seconds)
*/
smpl_t aubio_onset_get_minioi_s(const aubio_onset_t * o);
/** get minimum inter onset interval in milliseconds
\param o onset detection object as returned by new_aubio_onset()
\return minimum interval between two consecutive onsets (in
milliseconds)
*/
smpl_t aubio_onset_get_minioi_ms(const aubio_onset_t * o);
/** get delay in samples
\param o onset detection object as returned by new_aubio_onset()
\return constant system delay to take back from detection time
(in samples)
*/
uint_t aubio_onset_get_delay(const aubio_onset_t * o);
/** get delay in seconds
\param o onset detection object as returned by new_aubio_onset()
\return constant system delay to take back from detection time
(in seconds)
*/
smpl_t aubio_onset_get_delay_s(const aubio_onset_t * o);
/** get delay in milliseconds
\param o onset detection object as returned by new_aubio_onset()
\return constant system delay to take back from detection time
(in milliseconds)
*/
smpl_t aubio_onset_get_delay_ms(const aubio_onset_t * o);
/** get onset peak picking threshold
\param o onset detection object as returned by new_aubio_onset()
\return current onset detection threshold
*/
smpl_t aubio_onset_get_threshold(const aubio_onset_t * o);
/** delete onset detection object
\param o onset detection object to delete
*/
void del_aubio_onset(aubio_onset_t * o);
#ifdef __cplusplus
}
#endif
#endif /* AUBIO_ONSET_H */