ref: f862b85478065d5a23a9a3ff48c1093422eec278
dir: /src/notes/notes.h/
/*
Copyright (C) 2003-2014 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
Note detection object
*/
#ifndef _AUBIO_NOTES_H
#define _AUBIO_NOTES_H
#ifdef __cplusplus
extern "C" {
#endif
/** notes detection object */
typedef struct _aubio_notes_t aubio_notes_t;
/** create notes detection object
\param method notes 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_notes_t
*/
aubio_notes_t * new_aubio_notes (const char_t * method,
uint_t buf_size, uint_t hop_size, uint_t samplerate);
/** delete notes detection object
\param o notes detection object to delete
*/
void del_aubio_notes(aubio_notes_t * o);
/** execute note detection on an input signal frame
\param o note detection object as returned by new_aubio_notes()
\param input input signal of size [hop_size]
\param output output notes, fvec of length 3
The notes output is a vector of length 3 containing:
- 0. the midi note value, or 0 if no note was found
- 1. the note velocity
- 2. the midi note to turn off
*/
void aubio_notes_do (aubio_notes_t *o, const fvec_t * input, fvec_t * output);
/** set notes detection silence threshold
\param o notes detection object as returned by new_aubio_notes()
\param silence new silence detection threshold
\return 0 on success, non-zero otherwise
*/
uint_t aubio_notes_set_silence(aubio_notes_t * o, smpl_t silence);
/** get notes detection silence threshold
\param o notes detection object as returned by new_aubio_notes()
\return current silence threshold
*/
smpl_t aubio_notes_get_silence(const aubio_notes_t * o);
/** get notes detection minimum inter-onset interval, in millisecond
\param o notes detection object as returned by new_aubio_notes()
\return current minimum inter onset interval
*/
smpl_t aubio_notes_get_minioi_ms(const aubio_notes_t *o);
/** set notes detection minimum inter-onset interval, in millisecond
\param o notes detection object as returned by new_aubio_notes()
\param minioi_ms new inter-onset interval
\return 0 on success, non-zero otherwise
*/
uint_t aubio_notes_set_minioi_ms (aubio_notes_t *o, smpl_t minioi_ms);
/** get notes object release drop level, in dB
\param o notes detection object as returned by new_aubio_notes()
\return current release drop level, in dB
*/
smpl_t aubio_notes_get_release_drop (const aubio_notes_t *o);
/** set note release drop level, in dB
This function sets the release_drop_level parameter, in dB. When a new note
is found, the current level in dB is measured. If the measured level drops
under that initial level - release_drop_level, then a note-off will be
emitted.
Defaults to `10`, in dB.
\note This parameter was added in version `0.4.8`. Results obtained with
earlier versions can be reproduced by setting this value to `100`, so that
note-off will not be played until the next note.
\param o notes detection object as returned by new_aubio_notes()
\param release_drop new release drop level, in dB
\return 0 on success, non-zero otherwise
*/
uint_t aubio_notes_set_release_drop (aubio_notes_t *o, smpl_t release_drop);
#ifdef __cplusplus
}
#endif
#endif /* _AUBIO_NOTES_H */