*/
/** \file
-
- Onset detection driver
+
+ 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.
+ 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 ONSET_H
#define ONSET_H
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
+ \param samplerate sampling rate of the input signal
+
+ \return newly created ::aubio_onset_t
*/
-aubio_onset_t * new_aubio_onset (char_t * method,
+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 o onset detection object as returned by new_aubio_onset()
\param input new audio vector of length hop_size
- \param onset output vector, 1 if onset is found, 0 otherwise
+ \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, 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 (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 (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 (aubio_onset_t *o);
+
/** set onset detection silence threshold
- \param o onset detection object as returned by new_aubio_onset
+ \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);
-/** set onset detection peak picking threshold
+/** 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 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
+/** set minimum inter onset interval in samples
- \param o onset detection object as returned by new_aubio_onset
+ \param o onset detection object as returned by new_aubio_onset()
\param minioi minimum interval between two consecutive onsets (in
- milliseconds)
+ 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
+ \param o onset detection object to delete
*/
void del_aubio_onset(aubio_onset_t * o);
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