ref: 25e20014b7011fa1a4e90c7db3256455ae7b41ec
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 */