onset.h File Reference

Onset detection driver. More...

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Typedefs
typedef _aubio_onset_t	aubio_onset_t
	onset detection object
Functions
aubio_onset_t *	new_aubio_onset (aubio_onsetdetection_type type_onset, uint_t buf_size, uint_t hop_size, uint_t channels)
	create onset detection object
void	aubio_onset (aubio_onset_t *o, fvec_t *input, fvec_t *onset)
	execute onset detection
void	aubio_onset_set_silence (aubio_onset_t *o, smpl_t silence)
	set onset detection silence threshold
void	aubio_onset_set_threshold (aubio_onset_t *o, smpl_t threshold)
	set onset detection peak picking threshold
void	aubio_onset_set_minioi (aubio_onset_t *o, uint_t minioi)
	set minimum inter onset interval
void	del_aubio_onset (aubio_onset_t *o)
	delete onset detection object

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Detailed Description

Onset detection driver.

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 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 routine using the corresponding functions.

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Function Documentation

void aubio_onset	(	aubio_onset_t *	o,
		fvec_t *	input,
		fvec_t *	onset
	)

execute onset detection

Parameters:

	o	onset detection object as returned by new_aubio_onset
	input	new audio vector of length hop_size
	onset	output vector, 1 if onset is found, 0 otherwise

void aubio_onset_set_minioi	(	aubio_onset_t *	o,
		uint_t	minioi
	)

set minimum inter onset interval

Parameters:

	o	onset detection object as returned by new_aubio_onset
	minioi	minimum number of frames between onsets (in multiple of hop_size/samplerare)

void aubio_onset_set_silence	(	aubio_onset_t *	o,
		smpl_t	silence
	)

set onset detection silence threshold

Parameters:

	o	onset detection object as returned by new_aubio_onset
	silence	new silence detection threshold

void aubio_onset_set_threshold	(	aubio_onset_t *	o,
		smpl_t	threshold
	)

set onset detection peak picking threshold

Parameters:

	o	onset detection object as returned by new_aubio_onset
	threshold	new peak-picking threshold

void del_aubio_onset

(

aubio_onset_t *

o

)

delete onset detection object

Parameters:

o

onset detection object to delete

aubio_onset_t* new_aubio_onset	(	aubio_onsetdetection_type	type_onset,
		uint_t	buf_size,
		uint_t	hop_size,
		uint_t	channels
	)

create onset detection object

Parameters:

	type_onset	onset detection type as specified in onsetdetection.h
	buf_size	buffer size for phase vocoder
	hop_size	hop size for phase vocoder
	channels	number of channels

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