/* Copyright (C) 2006-2009 Paul Brossier 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 . */ /** \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 */ #ifndef ONSET_H #define 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 */ aubio_onset_t * new_aubio_onset (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_onset. 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, 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 */ smpl_t aubio_onset_get_last_onset (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 */ smpl_t aubio_onset_get_last_onset_s (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 */ smpl_t aubio_onset_get_last_onset_ms (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 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 ( 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 ( 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 minimum inter onset interval 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 minimum inter onset interval 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 minimum inter onset interval 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(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(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(aubio_onset_t * o); /** get minimum inter onset interval 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(aubio_onset_t * o); /** get minimum inter onset interval 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(aubio_onset_t * o); /** get minimum inter onset interval 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(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 /* ONSET_H */