source: plugins/puredata/aubioonset~.c @ 970bced

/**
 *
 * 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 0.3";

static t_class *aubioonset_tilde_class;

void aubioonset_tilde_setup (void);

typedef struct _aubioonset_tilde 
{
        t_object x_obj;
        t_float threshold;      
        t_int pos; /*frames%dspblocksize*/
        t_int bufsize;
        t_int hopsize;
        aubio_onset_t *o;
        fvec_t *in;
        fvec_t *out;
        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;
        for (j=0;j<n;j++) {
                /* write input to datanew */
                fvec_write_sample(x->in, in[j], 0, x->pos);
                /*time to do something */
                if (x->pos == x->hopsize-1) {         
                        /* block loop */
                        aubio_onset_do (x->o, x->in, x->out);
                        if (fvec_read_sample(x->out, 0, 0) > 0.) {
                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->in->data[0][0]);
        post("aubioonset~ onset:\t%f", x->out->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->bufsize   = 1024;
        x->hopsize   = x->bufsize / 2;

        x->o = new_aubio_onset ("complex",
            x->bufsize, x->hopsize, 1, (uint_t)sys_getsr());
        x->in = (fvec_t *)new_fvec(x->hopsize,1);
        x->out = (fvec_t *)new_fvec(1,1);

        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);
}