ref: 6f9615c3e875100ef293f2d15eee00b0d97b25e6
parent: 4d7ced925f1eaeaf8d77ae83e6aa744d250ff25b
author: Paul Brossier <piem@piem.org>
date: Sun Jul 13 17:57:55 EDT 2008
plugins/puredata/aubiozcr~.c: add aubiozcr~, computing zero crossing rate
--- a/plugins/puredata/Makefile.am
+++ b/plugins/puredata/Makefile.am
@@ -27,7 +27,8 @@
aubiotempo~.c \
aubiotss~.c \
aubioquiet~.c \
- aubiopitch~.c
+ aubiopitch~.c \
+ aubiozcr~.c
aubio_pd_linux_SOURCES = $(ALLSOURCES)
aubio_pd_darwin_SOURCES = $(ALLSOURCES)
--- a/plugins/puredata/aubio_setup.c
+++ b/plugins/puredata/aubio_setup.c
@@ -17,6 +17,7 @@
extern void aubiotss_tilde_setup (void);
extern void aubioquiet_tilde_setup (void);
extern void aubiopitch_tilde_setup (void);
+extern void aubiozcr_tilde_setup (void);
void *aubio_new (void)
{@@ -32,6 +33,7 @@
aubiotss_tilde_setup();
aubioquiet_tilde_setup();
aubiopitch_tilde_setup();
+ aubiozcr_tilde_setup();
aubio_class = class_new(gensym("aubio"), (t_newmethod)aubio_new, 0,sizeof(t_aubio), 0, 0);
}
--- /dev/null
+++ b/plugins/puredata/aubiozcr~.c
@@ -1,0 +1,91 @@
+
+/**
+ *
+ * a puredata wrapper for aubio zero crossing rate function
+ *
+ * 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 aubiozcr_version[] = "aubiozcr~ version 0.1";
+
+static t_class *aubiozcr_tilde_class;
+
+void aubiozcr_tilde_setup (void);
+
+typedef struct _aubiozcr_tilde
+{+ t_object x_obj;
+ t_int pos; /*frames%dspblocksize*/
+ t_int bufsize;
+ t_float f;
+ fvec_t *vec;
+ t_outlet *zcr;
+} t_aubiozcr_tilde;
+
+static t_int *aubiozcr_tilde_perform(t_int *w)
+{+ t_aubiozcr_tilde *x = (t_aubiozcr_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->vec, in[j], 0, x->pos);
+ /*time for fft*/
+ if (x->pos == x->bufsize-1) { + /* block loop */
+ outlet_float(x->zcr, aubio_zero_crossing_rate(x->vec));
+ /* end of block loop */
+ x->pos = -1; /* so it will be zero next j loop */
+ }
+ x->pos++;
+ }
+ return (w+4);
+}
+
+static void aubiozcr_tilde_dsp(t_aubiozcr_tilde *x, t_signal **sp)
+{+ dsp_add(aubiozcr_tilde_perform, 3, x, sp[0]->s_vec, sp[0]->s_n);
+}
+
+static void aubiozcr_tilde_debug(t_aubiozcr_tilde *x)
+{+ post("aubiozcr~ bufsize:\t%d", x->bufsize);+ post("aubiozcr~ audio in:\t%f", x->vec->data[0][0]);+}
+
+static void *aubiozcr_tilde_new (void)
+{+ t_aubiozcr_tilde *x =
+ (t_aubiozcr_tilde *)pd_new(aubiozcr_tilde_class);
+
+ x->bufsize = 1024;
+
+ x->vec = (fvec_t *)new_fvec(x->bufsize,1);
+
+ x->zcr = outlet_new (&x->x_obj, &s_float);
+ post(aubiozcr_version);
+ return (void *)x;
+}
+
+void aubiozcr_tilde_setup (void)
+{+ aubiozcr_tilde_class = class_new (gensym ("aubiozcr~"),+ (t_newmethod)aubiozcr_tilde_new,
+ 0, sizeof (t_aubiozcr_tilde),
+ CLASS_DEFAULT, 0);
+ class_addmethod(aubiozcr_tilde_class,
+ (t_method)aubiozcr_tilde_dsp,
+ gensym("dsp"), 0);+ class_addmethod(aubiozcr_tilde_class,
+ (t_method)aubiozcr_tilde_debug,
+ gensym("debug"), 0);+ CLASS_MAINSIGNALIN(aubiozcr_tilde_class,
+ t_aubiozcr_tilde, f);
+}
+
--- /dev/null
+++ b/plugins/puredata/help/aubiozcr~-help.pd
@@ -1,0 +1,11 @@
+#N canvas 0 22 580 309 10;
+#X obj 37 71 aubiozcr~;
+#X obj 37 43 osc~ 441;
+#X floatatom 36 98 5 0 0 0 - - -;
+#X text 153 36 aubiozcr~ computes the zero-crossing rate;
+#X text 152 95 For a sine tone at 441Hz sampled at 44100Hz signal \,
+the ZCR is 0.02.;
+#X text 153 59 This value represents the number of times where the
+signal changes sign.;
+#X connect 0 0 2 0;
+#X connect 1 0 0 0;