ref: 917d4c152a2c365b7e42d63dd04177514e5451f2
dir: /src/tempo/tempo.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
Tempo detection object
This object stores all the memory required for tempo detection algorithm
and returns the estimated beat locations.
\example tempo/test-tempo.c
*/
#ifndef TEMPO_H
#define TEMPO_H
#ifdef __cplusplus
extern "C" {
#endif
/** tempo detection structure */
typedef struct _aubio_tempo_t aubio_tempo_t;
/** create tempo detection object
\param buf_size length of FFT
\param hop_size number of frames between two consecutive runs
\param samplerate sampling rate of the signal to analyze
\return newly created ::aubio_tempo_t if successful, `NULL` otherwise
*/
aubio_tempo_t * new_aubio_tempo (char_t * method,
uint_t buf_size, uint_t hop_size, uint_t samplerate);
/** execute tempo detection
\param o beat tracking object
\param input new samples
\param tempo output beats
*/
void aubio_tempo_do (aubio_tempo_t *o, fvec_t * input, fvec_t * tempo);
/** get the time of the latest beat detected, in samples
\param o tempo detection object as returned by ::new_aubio_tempo
*/
uint_t aubio_tempo_get_last (aubio_tempo_t *o);
/** get the time of the latest beat detected, in seconds
\param o tempo detection object as returned by ::new_aubio_tempo
*/
smpl_t aubio_tempo_get_last_s (aubio_tempo_t *o);
/** get the time of the latest beat detected, in milliseconds
\param o tempo detection object as returned by ::new_aubio_tempo
*/
smpl_t aubio_tempo_get_last_ms (aubio_tempo_t *o);
/** set tempo detection silence threshold
\param o beat tracking object
\param threshold new silence threshold, in dB
\return `0` if successful, non-zero otherwise
*/
uint_t aubio_tempo_set_silence(aubio_tempo_t * o, smpl_t silence);
/** set tempo detection peak picking threshold
\param o beat tracking object
\param threshold new threshold
\return `0` if successful, non-zero otherwise
*/
uint_t aubio_tempo_set_threshold(aubio_tempo_t * o, smpl_t threshold);
/** get current tempo
\param o beat tracking object
\return the currently observed tempo, or `0` if no consistent value is found
*/
smpl_t aubio_tempo_get_bpm(aubio_tempo_t * o);
/** get current tempo confidence
\param o beat tracking object
\return confidence with which the tempo has been observed, `0` if no
consistent value is found.
*/
smpl_t aubio_tempo_get_confidence(aubio_tempo_t * o);
/** delete tempo detection object
\param o beat tracking object
*/
void del_aubio_tempo(aubio_tempo_t * o);
#ifdef __cplusplus
}
#endif
#endif /* TEMPO_H */