source: src/pitchdetection.c @ d17f63e

/*
   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 "phasevoc.h"
#include "mathutils.h"
#include "filter.h"
#include "pitchyin.h"
#include "pitchmcomb.h"
#include "pitchdetection.h"

struct _aubio_pitchdetection_t {
        aubio_pitchdetection_type type;
        aubio_pitchdetection_mode mode;
        uint_t srate;
        uint_t bufsize;
        /* for mcomb */ 
        aubio_pvoc_t * pv;
        cvec_t * fftgrain; 
        aubio_pitchmcomb_t * mcomb;
        aubio_filter_t * filter;
        /* for yin */
        fvec_t * buf;
        fvec_t * yin;
};

aubio_pitchdetection_t * new_aubio_pitchdetection(uint_t bufsize, 
                uint_t hopsize, 
                uint_t channels,
                uint_t samplerate,
                aubio_pitchdetection_type type,
                aubio_pitchdetection_mode mode)
{
        aubio_pitchdetection_t *p = AUBIO_NEW(aubio_pitchdetection_t);
        p->srate = samplerate;
        p->type = type;
        p->bufsize = bufsize;
        switch(p->type) {
                case yin:
                        p->buf      = new_fvec(bufsize,channels);
                        p->yin      = new_fvec(bufsize/2,channels);
                        break;
                case mcomb:
                        p->pv       = new_aubio_pvoc(bufsize, hopsize, channels);
                        p->fftgrain = new_cvec(bufsize, channels);
                        p->filter   = new_aubio_adsgn_filter((smpl_t)samplerate);
                        p->mcomb    = new_aubio_pitchmcomb(bufsize,channels);
                        break;
                default:
                        break;
        }
        return p;
}

void del_aubio_pitchdetection(aubio_pitchdetection_t * p) {
        switch(p->type) {
                case yin:
                        del_fvec(p->yin);
                        del_fvec(p->buf);
                        break;
                case mcomb:
                        del_aubio_pvoc(p->pv);
                        del_cvec(p->fftgrain);
                        //del_aubio_adsgn_filter(p->filter);
                        //del_aubio_pitchmcomb(p->mcomb);
                        break;
                default:
                        break;
        }
        AUBIO_FREE(p);
}

/** \bug ugly, should replace with function pointers or so */
smpl_t aubio_pitchdetection(aubio_pitchdetection_t *p, fvec_t * ibuf) {
        smpl_t pitch = 0.;
        uint_t i,j = 0;
        switch(p->type) {
                case yin:
                        /* do sliding window blocking */
                        for (i=0;i<p->buf->channels;i++){
                                for (j=0;j<p->buf->length-ibuf->length;j++){
                                        p->buf->data[i][j] = p->buf->data[i][j+ibuf->length];
                                }
                        }
                        for (i=0;i<ibuf->channels;i++){
                                for (j=0;j<ibuf->length;j++){
                                        p->buf->data[i][j] = ibuf->data[i][j];
                                }
                        }
                        /* get the autocorr and pitch */
                        aubio_pitchyin_diff(p->buf,p->yin);
                        aubio_pitchyin_getcum(p->yin);
                        pitch = aubio_pitchyin_getpitch(p->yin);
                        if (pitch>0) {
                                pitch = p->srate/(pitch+0.);
                        } else {
                                pitch = 0.;
                        }
                        //fprintf(stderr,"%f\n",pitch);
                        break;
                case mcomb:
                        aubio_filter_do(p->filter,ibuf);
                        aubio_filter_do(p->filter,ibuf);
                        aubio_pvoc_do(p->pv,ibuf,p->fftgrain);
                        pitch = aubio_pitchmcomb_detect(p->mcomb,p->fftgrain);
                        if (pitch>0.) {
                                pitch = bintofreq(pitch,p->srate,p->bufsize);
                        } else {
                                pitch = 0.;
                        }
                        break;
                default:
                        break;
        }
        return pitch;
}