ref: 52efae1200ebd8c5acf4d389f165cfac2bd8cceb
dir: /src/tempo/tempo.c/
/*
Copyright (C) 2006-2009 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/>.
*/
#include "aubio_priv.h"
#include "fvec.h"
#include "cvec.h"
#include "spectral/specdesc.h"
#include "tempo/beattracking.h"
#include "spectral/phasevoc.h"
#include "onset/peakpicker.h"
#include "mathutils.h"
#include "tempo/tempo.h"
// TODO implement get/set_delay
/** set current delay
\param o beat tracking object
\return current delay, in samples
*/
uint_t aubio_tempo_get_delay(aubio_tempo_t * o);
/** set current delay
\param o beat tracking object
\param delay delay to set tempo to, in samples
\return `0` if successful, non-zero otherwise
*/
uint_t aubio_tempo_set_delay(aubio_tempo_t * o, uint_t delay);
/* structure to store object state */
struct _aubio_tempo_t {
aubio_specdesc_t * od; /** onset detection */
aubio_pvoc_t * pv; /** phase vocoder */
aubio_peakpicker_t * pp; /** peak picker */
aubio_beattracking_t * bt; /** beat tracking */
cvec_t * fftgrain; /** spectral frame */
fvec_t * of; /** onset detection function value */
fvec_t * dfframe; /** peak picked detection function buffer */
fvec_t * out; /** beat tactus candidates */
fvec_t * onset; /** onset results */
smpl_t silence; /** silence parameter */
smpl_t threshold; /** peak picking threshold */
sint_t blockpos; /** current position in dfframe */
uint_t winlen; /** dfframe bufsize */
uint_t step; /** dfframe hopsize */
uint_t samplerate; /** sampling rate of the signal */
uint_t hop_size; /** get hop_size */
uint_t total_frames; /** total frames since beginning */
uint_t last_beat; /** time of latest detected beat, in samples */
uint_t delay; /** delay to remove to last beat, in samples */
};
/* execute tempo detection function on iput buffer */
void aubio_tempo_do(aubio_tempo_t *o, fvec_t * input, fvec_t * tempo)
{
uint_t i;
uint_t winlen = o->winlen;
uint_t step = o->step;
fvec_t * thresholded;
aubio_pvoc_do (o->pv, input, o->fftgrain);
aubio_specdesc_do (o->od, o->fftgrain, o->of);
/*if (usedoubled) {
aubio_specdesc_do(o2,fftgrain, onset2);
onset->data[0] *= onset2->data[0];
}*/
/* execute every overlap_size*step */
if (o->blockpos == (signed)step -1 ) {
/* check dfframe */
aubio_beattracking_do(o->bt,o->dfframe,o->out);
/* rotate dfframe */
for (i = 0 ; i < winlen - step; i++ )
o->dfframe->data[i] = o->dfframe->data[i+step];
for (i = winlen - step ; i < winlen; i++ )
o->dfframe->data[i] = 0.;
o->blockpos = -1;
}
o->blockpos++;
aubio_peakpicker_do (o->pp, o->of, o->onset);
tempo->data[1] = o->onset->data[0];
thresholded = aubio_peakpicker_get_thresholded_input(o->pp);
o->dfframe->data[winlen - step + o->blockpos] = thresholded->data[0];
/* end of second level loop */
tempo->data[0] = 0; /* reset tactus */
i=0;
for (i = 1; i < o->out->data[0]; i++ ) {
/* if current frame is a predicted tactus */
if (o->blockpos == FLOOR(o->out->data[i])) {
tempo->data[0] = o->out->data[i] - FLOOR(o->out->data[i]); /* set tactus */
/* test for silence */
/*
if (aubio_silence_detection(input, o->silence)==1) {
tempo->data[0] = 0; // unset beat if silent
}
*/
o->last_beat = o->total_frames + (uint_t)ROUND(tempo->data[0] * o->hop_size);
}
}
o->total_frames += o->hop_size;
return;
}
uint_t aubio_tempo_get_last (aubio_tempo_t *o)
{
return o->last_beat - o->delay;
}
smpl_t aubio_tempo_get_last_s (aubio_tempo_t *o)
{
return aubio_tempo_get_last (o) / (smpl_t) (o->samplerate);
}
smpl_t aubio_tempo_get_last_ms (aubio_tempo_t *o)
{
return aubio_tempo_get_last_s (o) * 1000.;
}
uint_t aubio_tempo_set_delay(aubio_tempo_t * o, uint_t delay) {
o->delay = delay;
return AUBIO_OK;
}
uint_t aubio_tempo_get_delay(aubio_tempo_t * o) {
return o->delay;
}
uint_t aubio_tempo_set_silence(aubio_tempo_t * o, smpl_t silence) {
o->silence = silence;
return AUBIO_OK;
}
uint_t aubio_tempo_set_threshold(aubio_tempo_t * o, smpl_t threshold) {
o->threshold = threshold;
aubio_peakpicker_set_threshold(o->pp, o->threshold);
return AUBIO_OK;
}
/* Allocate memory for an tempo detection */
aubio_tempo_t * new_aubio_tempo (char_t * onset_mode,
uint_t buf_size, uint_t hop_size, uint_t samplerate)
{
aubio_tempo_t * o = AUBIO_NEW(aubio_tempo_t);
o->samplerate = samplerate;
/* length of observations, worth about 6 seconds */
o->winlen = aubio_next_power_of_two(5.8 * samplerate / hop_size);
o->step = o->winlen/4;
o->blockpos = 0;
o->threshold = 0.3;
o->silence = -90.;
o->total_frames = 0;
o->last_beat = 0;
o->delay = 0;
o->hop_size = hop_size;
o->dfframe = new_fvec(o->winlen);
o->fftgrain = new_cvec(buf_size);
o->out = new_fvec(o->step);
o->pv = new_aubio_pvoc(buf_size, hop_size);
o->pp = new_aubio_peakpicker();
aubio_peakpicker_set_threshold (o->pp, o->threshold);
o->od = new_aubio_specdesc(onset_mode,buf_size);
o->of = new_fvec(1);
o->bt = new_aubio_beattracking(o->winlen, o->hop_size, o->samplerate);
o->onset = new_fvec(1);
/*if (usedoubled) {
o2 = new_aubio_specdesc(type_onset2,buffer_size);
onset2 = new_fvec(1);
}*/
return o;
}
smpl_t aubio_tempo_get_bpm(aubio_tempo_t *o) {
return aubio_beattracking_get_bpm(o->bt);
}
smpl_t aubio_tempo_get_confidence(aubio_tempo_t *o) {
return aubio_beattracking_get_confidence(o->bt);
}
void del_aubio_tempo (aubio_tempo_t *o)
{
del_aubio_specdesc(o->od);
del_aubio_beattracking(o->bt);
del_aubio_peakpicker(o->pp);
del_aubio_pvoc(o->pv);
del_fvec(o->out);
del_fvec(o->of);
del_cvec(o->fftgrain);
del_fvec(o->dfframe);
del_fvec(o->onset);
AUBIO_FREE(o);
return;
}