ref: e99242a33df6cf2194cf4411475a194597f8a439
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" /* 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 */ sint_t delay; /** delay to remove to last beat, in samples */ uint_t last_tatum; /** time of latest detected tatum, in samples */ uint_t tatum_signature; /** number of tatum between each beats */ }; /* execute tempo detection function on iput buffer */ void aubio_tempo_do(aubio_tempo_t *o, const 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); // store onset detection function in second sample of vector //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->last_tatum = o->last_beat; } } 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, sint_t delay) { o->delay = delay; return AUBIO_OK; } uint_t aubio_tempo_set_delay_s(aubio_tempo_t * o, smpl_t delay) { o->delay = delay * o->samplerate; return AUBIO_OK; } uint_t aubio_tempo_set_delay_ms(aubio_tempo_t * o, smpl_t delay) { o->delay = 1000. * delay * o->samplerate; return AUBIO_OK; } uint_t aubio_tempo_get_delay(aubio_tempo_t * o) { return o->delay; } smpl_t aubio_tempo_get_delay_s(aubio_tempo_t * o) { return o->delay / (smpl_t)(o->samplerate); } smpl_t aubio_tempo_get_delay_ms(aubio_tempo_t * o) { return o->delay / (smpl_t)(o->samplerate) / 1000.; } uint_t aubio_tempo_set_silence(aubio_tempo_t * o, smpl_t silence) { o->silence = silence; return AUBIO_OK; } smpl_t aubio_tempo_get_silence(aubio_tempo_t * o) { return o->silence; } 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; } smpl_t aubio_tempo_get_threshold(aubio_tempo_t * o) { return o->threshold; } /* Allocate memory for an tempo detection */ aubio_tempo_t * new_aubio_tempo (const char_t * tempo_mode, uint_t buf_size, uint_t hop_size, uint_t samplerate) { aubio_tempo_t * o = AUBIO_NEW(aubio_tempo_t); char_t specdesc_func[20]; o->samplerate = samplerate; // check parameters are valid if ((sint_t)hop_size < 1) { AUBIO_ERR("tempo: got hop size %d, but can not be < 1\n", hop_size); goto beach; } else if ((sint_t)buf_size < 2) { AUBIO_ERR("tempo: got window size %d, but can not be < 2\n", buf_size); goto beach; } else if (buf_size < hop_size) { AUBIO_ERR("tempo: hop size (%d) is larger than window size (%d)\n", buf_size, hop_size); goto beach; } else if ((sint_t)samplerate < 1) { AUBIO_ERR("tempo: samplerate (%d) can not be < 1\n", samplerate); goto beach; } /* length of observations, worth about 6 seconds */ o->winlen = aubio_next_power_of_two(5.8 * samplerate / hop_size); if (o->winlen < 4) o->winlen = 4; 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); if ( strcmp(tempo_mode, "default") == 0 ) { strcpy(specdesc_func, "specflux"); } else { strcpy(specdesc_func, tempo_mode); } o->od = new_aubio_specdesc(specdesc_func,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); }*/ o->last_tatum = 0; o->tatum_signature = 4; return o; beach: AUBIO_FREE(o); return NULL; } smpl_t aubio_tempo_get_bpm(aubio_tempo_t *o) { return aubio_beattracking_get_bpm(o->bt); } smpl_t aubio_tempo_get_period (aubio_tempo_t *o) { return aubio_beattracking_get_period (o->bt); } smpl_t aubio_tempo_get_period_s (aubio_tempo_t *o) { return aubio_beattracking_get_period_s (o->bt); } smpl_t aubio_tempo_get_confidence(aubio_tempo_t *o) { return aubio_beattracking_get_confidence(o->bt); } uint_t aubio_tempo_was_tatum (aubio_tempo_t *o) { uint_t last_tatum_distance = o->total_frames - o->last_tatum; smpl_t beat_period = aubio_tempo_get_period(o); smpl_t tatum_period = beat_period / o->tatum_signature; if (last_tatum_distance < o->hop_size) { o->last_tatum = o->last_beat; return 2; } else if (last_tatum_distance > tatum_period) { if ( last_tatum_distance + o->hop_size > beat_period ) { // next beat is too close, pass return 0; } o->last_tatum = o->total_frames; return 1; } return 0; } smpl_t aubio_tempo_get_last_tatum (aubio_tempo_t *o) { return (smpl_t)o->last_tatum - o->delay; } uint_t aubio_tempo_set_tatum_signature (aubio_tempo_t *o, uint_t signature) { if (signature < 1 || signature > 64) { return AUBIO_FAIL; } else { o->tatum_signature = signature; return AUBIO_OK; } } 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; }