source: plugins/puredata/aubioonset~.c @ 961c39c3

/**
 *
 * a puredata wrapper for aubio onset detection functions 
 *
 * Thanks to Johannes M Zmolnig for writing the excellent HOWTO:
 *       http://iem.kug.ac.at/pd/externals-HOWTO/  
 *
 * */

#include <m_pd.h>
#include <aubio.h>

char aubioonset_version[] = "aubioonset~ version 0.1";

static t_class *aubioonset_tilde_class;

void aubioonset_tilde_setup (void);

typedef struct _aubioonset_tilde 
{
        t_object x_obj;
        t_float threshold;      
        t_float threshold2;     
        t_int pos; /*frames%dspblocksize*/
        t_int bufsize;
        t_int hopsize;
        aubio_onsetdetection_t *o;
        aubio_pvoc_t * pv;
        aubio_pickpeak_t * parms;
        fvec_t *vec;
        fvec_t *onset;
        cvec_t *fftgrain;
        t_outlet *onsetbang;
} t_aubioonset_tilde;

static t_int *aubioonset_tilde_perform(t_int *w) 
{
        t_aubioonset_tilde *x = (t_aubioonset_tilde *)(w[1]);
        t_sample *in          = (t_sample *)(w[2]);
        int n                 = (int)(w[3]);
        int j,isonset;
        for (j=0;j<n;j++) {
                /* write input to datanew */
                fvec_write_sample(x->vec, in[j], 0, x->pos);
                /*time for fft*/
                if (x->pos == x->hopsize-1) {         
                        /* block loop */
                        aubio_pvoc_do (x->pv,x->vec, x->fftgrain);
                        aubio_onsetdetection(x->o,x->fftgrain, x->onset);
                        isonset = aubio_peakpick_pimrt(x->onset,x->parms);
                        if (isonset) {
                                /* test for silence */
                                if (aubio_silence_detection(x->vec, x->threshold2)==1)
                                        isonset=0;
                                else
                                        outlet_bang(x->onsetbang);
                        }
                        /* end of block loop */
                        x->pos = -1; /* so it will be zero next j loop */
                }
                x->pos++;
        }
        return (w+4);
}

static void aubioonset_tilde_dsp(t_aubioonset_tilde *x, t_signal **sp)
{
        dsp_add(aubioonset_tilde_perform, 3, x, sp[0]->s_vec, sp[0]->s_n);
}

static void aubioonset_tilde_debug(t_aubioonset_tilde *x)
{
        post("aubioonset~ bufsize:\t%d", x->bufsize);
        post("aubioonset~ hopsize:\t%d", x->hopsize);
        post("aubioonset~ threshold:\t%f", x->threshold);
        post("aubioonset~ audio in:\t%f", x->vec->data[0][0]);
        post("aubioonset~ onset:\t%f", x->onset->data[0][0]);
}

static void *aubioonset_tilde_new (t_floatarg f)
{
        t_aubioonset_tilde *x = 
                (t_aubioonset_tilde *)pd_new(aubioonset_tilde_class);

        x->threshold = (f < 1e-5) ? 0.1 : (f > 10.) ? 10. : f;
        x->threshold2 = -70.;
        x->bufsize   = 1024;
        x->hopsize   = x->bufsize / 2;

        x->o = new_aubio_onsetdetection(aubio_onset_complex, x->bufsize, 1);
        x->vec = (fvec_t *)new_fvec(x->hopsize,1);
        x->pv = (aubio_pvoc_t *)new_aubio_pvoc(x->bufsize, x->hopsize, 1);
        x->fftgrain  = (cvec_t *)new_cvec(x->bufsize,1);
        x->onset = (fvec_t *)new_fvec(1,1);
        x->parms = new_aubio_peakpicker(x->threshold);

        floatinlet_new (&x->x_obj, &x->threshold);
        x->onsetbang = outlet_new (&x->x_obj, &s_bang);
        post(aubioonset_version);
        return (void *)x;
}

void aubioonset_tilde_setup (void)
{
        aubioonset_tilde_class = class_new (gensym ("aubioonset~"),
                        (t_newmethod)aubioonset_tilde_new,
                        0, sizeof (t_aubioonset_tilde),
                        CLASS_DEFAULT, A_DEFFLOAT, 0);
        class_addmethod(aubioonset_tilde_class, 
                        (t_method)aubioonset_tilde_dsp, 
                        gensym("dsp"), 0);
        class_addmethod(aubioonset_tilde_class, 
                        (t_method)aubioonset_tilde_debug,
                        gensym("debug"), 0);
        CLASS_MAINSIGNALIN(aubioonset_tilde_class, 
                        t_aubioonset_tilde, threshold);
}