ref: 4d4ff4f40f2024e1f74eb7812f7e4a04cbf3a14e
dir: /src/peakpick.c/
/* Copyright (C) 2003 Paul Brossier This program 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 2 of the License, or (at your option) any later version. This program 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 this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "aubio_priv.h" #include "sample.h" #include "mathutils.h" #include "biquad.h" #include "peakpick.h" /* peak picking parameters, default values in brackets * * [<----post----|--pre-->] * .................|............. * time-> ^now */ struct _aubio_pickpeak_t { /** thresh: offset threshold [0.033 or 0.01] */ smpl_t threshold; /** win_post: median filter window length (causal part) [8] */ uint_t win_post; /** pre: median filter window (anti-causal part) [post-1] */ uint_t win_pre; /** threshfn: name or handle of fn for computing adaptive threshold [@median] */ //aubio_thresholdfn_t thresholdfn; /** picker: name or handle of fn for picking event times [@peakpick] */ aubio_pickerfn_t pickerfn; /** biquad lowpass filter */ aubio_biquad_t * biquad; /** original onsets */ fvec_t * onset_keep; /** modified onsets */ fvec_t * onset_proc; /* peak picked window [3] */ fvec_t * onset_peek; /** scratch pad for biquad and median */ fvec_t * scratch; /** \bug should be used to calculate filter coefficients */ /* cutoff: low-pass filter cutoff [0.34, 1] */ /* smpl_t cutoff; */ /* not used anymore */ /* time precision [512/44100 winlength/samplerate, fs/buffer_size */ /* smpl_t tau; */ /* alpha: normalisation exponent [9] */ /* smpl_t alpha; */ }; /** modified version for real time, moving mean adaptive threshold this method * is slightly more permissive than the offline one, and yelds to an increase * of false positives. best */ uint_t aubio_peakpick_pimrt(fvec_t * onset, aubio_pickpeak_t * p) { fvec_t * onset_keep = (fvec_t *)p->onset_keep; fvec_t * onset_proc = (fvec_t *)p->onset_proc; fvec_t * onset_peek = (fvec_t *)p->onset_peek; fvec_t * scratch = (fvec_t *)p->scratch; smpl_t mean = 0., median = 0.; uint_t length = p->win_post + p->win_pre + 1; uint_t i = 0, j; /* store onset in onset_keep */ /* shift all elements but last, then write last */ /* for (i=0;i<channels;i++) { */ for (j=0;j<length-1;j++) { onset_keep->data[i][j] = onset_keep->data[i][j+1]; onset_proc->data[i][j] = onset_keep->data[i][j]; } onset_keep->data[i][length-1] = onset->data[i][0]; onset_proc->data[i][length-1] = onset->data[i][0]; /* } */ /* filter onset_proc */ /** \bug filtfilt calculated post+pre times, should be only once !? */ aubio_biquad_do_filtfilt(p->biquad,onset_proc,scratch); /* calculate mean and median for onset_proc */ /* for (i=0;i<onset_proc->channels;i++) { */ mean = vec_mean(onset_proc); /* copy to scratch */ for (j = 0; j < length; j++) scratch->data[i][j] = onset_proc->data[i][j]; median = vec_median(scratch); /* } */ /* for (i=0;i<onset->channels;i++) { */ /* shift peek array */ for (j=0;j<3-1;j++) onset_peek->data[i][j] = onset_peek->data[i][j+1]; /* calculate new peek value */ onset_peek->data[i][2] = onset_proc->data[i][p->win_post] - median - mean * p->threshold; /* } */ //AUBIO_DBG("%f\n", onset_peek->data[0][2]); return (p->pickerfn)(onset_peek,1); } /** function added by Miguel Ramirez to return the onset detection amplitude in peakval */ uint_t aubio_peakpick_pimrt_wt(fvec_t * onset, pickparams_t * p, smpl_t* peakval) { fvec_t * onset_keep = (fvec_t *)p->onset_keep; fvec_t * onset_proc = (fvec_t *)p->onset_proc; fvec_t * onset_peek = (fvec_t *)p->onset_peek; fvec_t * scratch = (fvec_t *)p->scratch; smpl_t mean = 0., median = 0.; uint_t length = p->win_post + p->win_pre + 1; uint_t i = 0, j, isonset = 0; /* store onset in onset_keep */ /* shift all elements but last, then write last */ for (j=0;j<length-1;j++) { onset_keep->data[i][j] = onset_keep->data[i][j+1]; onset_proc->data[i][j] = onset_keep->data[i][j]; } onset_keep->data[i][length-1] = onset->data[i][0]; onset_proc->data[i][length-1] = onset->data[i][0]; /* filter onset_proc */ /** \bug filtfilt calculated post+pre times should be only once !? */ aubio_biquad_do_filtfilt(p->biquad,onset_proc,scratch); /* calculate mean and median for onset_proc */ mean = vec_mean(onset_proc); /* copy to scratch */ for (j = 0; j < length; j++) scratch->data[i][j] = onset_proc->data[i][j]; median = vec_median(scratch); /* shift peek array */ for (j=0;j<3-1;j++) onset_peek->data[i][j] = onset_peek->data[i][j+1]; /* calculate new peek value */ onset_peek->data[i][2] = onset_proc->data[i][p->win_post] - median - mean * p->threshold; isonset = (p->pickerfn)(onset_peek,1); //if ( isonset && peakval != NULL ) if ( peakval != NULL ) *peakval = onset_peek->data[i][1]; return isonset; } aubio_pickpeak_t * new_aubio_peakpicker(smpl_t threshold) { aubio_pickpeak_t * t = AUBIO_NEW(aubio_pickpeak_t); t->threshold = 0.1; /* 0.0668; 0.33; 0.082; 0.033; */ if (threshold > 0. && threshold < 10.) t->threshold = threshold; t->win_post = 5; t->win_pre = 1; //t->thresholdfn = (aubio_thresholdfn_t)(vec_median); /* (vec_mean); */ t->pickerfn = (aubio_pickerfn_t)(vec_peakpick); t->scratch = new_fvec(t->win_post+t->win_pre+1,1); t->onset_keep = new_fvec(t->win_post+t->win_pre+1,1); t->onset_proc = new_fvec(t->win_post+t->win_pre+1,1); t->onset_peek = new_fvec(3,1); /* cutoff: low-pass filter cutoff [0.34, 1] */ /* t->cutoff=0.34; */ t->biquad = new_aubio_biquad(0.1600,0.3200,0.1600,-0.5949,0.2348); return t; } void del_aubio_peakpicker(aubio_pickpeak_t * p) { //del_aubio_biquad(p->biquad); del_fvec(p->onset_keep); del_fvec(p->onset_proc); del_fvec(p->onset_peek); del_fvec(p->scratch); }