ref: de2a8af8ce5caf1a774185841fcdf7870039881a
dir: /src/onsetdetection.h/
/*
Copyright (C) 2003 Paul Brossier
This program 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 2 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/** \file
Onset detection functions
All of the following onset detection function take as arguments the FFT of a
windowed signal (as created with aubio_pvoc). They output one smpl_t per
buffer and per channel (stored in a vector of size [channels]x[1]).
These functions were first adapted from Juan Pablo Bello's code, and now
include further improvements and modifications made within aubio.
*/
#ifndef ONSETDETECTION_H
#define ONSETDETECTION_H
#ifdef __cplusplus
extern "C" {
#endif
/** onsetdetection types */
typedef enum {
aubio_onset_energy, /**< energy based */
aubio_onset_specdiff, /**< spectral diff */
aubio_onset_hfc, /**< high frequency content */
aubio_onset_complex, /**< complex domain */
aubio_onset_phase, /**< phase fast */
aubio_onset_kl, /**< Kullback Liebler */
aubio_onset_mkl /**< modified Kullback Liebler */
} aubio_onsetdetection_type;
/** onsetdetection structure */
typedef struct _aubio_onsetdetection_t aubio_onsetdetection_t;
/** Energy based onset detection function
This function calculates the local energy of the input spectral frame.
\param o onset detection object as returned by new_aubio_onsetdetection()
\param fftgrain input spectral frame
\param onset output onset detection function
*/
void aubio_onsetdetection_energy(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset);
/** High Frequency Content onset detection function
This method computes the High Frequency Content (HFC) of the input spectral
frame. The resulting function is efficient at detecting percussive onsets.
Paul Masri. Computer modeling of Sound for Transformation and Synthesis of
Musical Signal. PhD dissertation, University of Bristol, UK, 1996.
\param o onset detection object as returned by new_aubio_onsetdetection()
\param fftgrain input spectral frame
\param onset output onset detection function
*/
void aubio_onsetdetection_hfc(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset);
/** Complex Domain Method onset detection function
Christopher Duxbury, Mike E. Davies, and Mark B. Sandler. Complex domain
onset detection for musical signals. In Proceedings of the Digital Audio
Effects Conference, DAFx-03, pages 90-93, London, UK, 2003.
\param o onset detection object as returned by new_aubio_onsetdetection()
\param fftgrain input spectral frame
\param onset output onset detection function
*/
void aubio_onsetdetection_complex(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset);
/** Phase Based Method onset detection function
Juan-Pablo Bello, Mike P. Davies, and Mark B. Sandler. Phase-based note onset
detection for music signals. In Proceedings of the IEEE International
Conference on Acoustics Speech and Signal Processing, pages 441444,
Hong-Kong, 2003.
\param o onset detection object as returned by new_aubio_onsetdetection()
\param fftgrain input spectral frame
\param onset output onset detection function
*/
void aubio_onsetdetection_phase(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset);
/** Spectral difference method onset detection function
Jonhatan Foote and Shingo Uchihashi. The beat spectrum: a new approach to
rhythm analysis. In IEEE International Conference on Multimedia and Expo
(ICME 2001), pages 881884, Tokyo, Japan, August 2001.
\param o onset detection object as returned by new_aubio_onsetdetection()
\param fftgrain input spectral frame
\param onset output onset detection function
*/
void aubio_onsetdetection_specdiff(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset);
/** Kullback-Liebler onset detection function
Stephen Hainsworth and Malcom Macleod. Onset detection in music audio
signals. In Proceedings of the International Computer Music Conference
(ICMC), Singapore, 2003.
\param o onset detection object as returned by new_aubio_onsetdetection()
\param fftgrain input spectral frame
\param onset output onset detection function
*/
void aubio_onsetdetection_kl(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset);
/** Modified Kullback-Liebler onset detection function
Paul Brossier, ``Automatic annotation of musical audio for interactive
systems'', Chapter 2, Temporal segmentation, PhD thesis, Centre for Digital
music, Queen Mary University of London, London, UK, 2006.
\param o onset detection object as returned by new_aubio_onsetdetection()
\param fftgrain input spectral frame
\param onset output onset detection function
*/
void aubio_onsetdetection_mkl(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset);
/** execute onset detection function on a spectral frame
Generic function to compute onset detection.
\param o onset detection object as returned by new_aubio_onsetdetection()
\param fftgrain input signal spectrum as computed by aubio_pvoc_do
\param onset output vector (one sample long, to send to the peak picking)
*/
void aubio_onsetdetection(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset);
/** creation of an onset detection object
\param type onset detection mode
\param size length of the input spectrum frame
\param channels number of input channels
*/
aubio_onsetdetection_t * new_aubio_onsetdetection(aubio_onsetdetection_type type, uint_t size, uint_t channels);
/** deletion of an onset detection object
\param o onset detection object as returned by new_aubio_onsetdetection()
*/
void del_aubio_onsetdetection(aubio_onsetdetection_t *o);
/** deletion of an onset detection object (obsolete)
\param o onset detection object as returned by new_aubio_onsetdetection()
*/
void aubio_onsetdetection_free(aubio_onsetdetection_t *o);
#ifdef __cplusplus
}
#endif
#endif /* ONSETDETECTION_H */