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examples/utils.c: allocate note event once

--- a/examples/utils.c

+++ b/examples/utils.c

@@ -76,6 +76,7 @@

 #if HAVE_JACK

 aubio_jack_t *jack_setup;

+jack_midi_event_t ev;

 #endif /* HAVE_JACK */

 void examples_common_init (int argc, char **argv);

@@ -127,6 +128,9 @@

 void examples_common_del (void)

 {

+#ifdef HAVE_JACK

+  if (ev.buffer) free(ev.buffer);

+#endif

   del_fvec (ibuf);

   del_fvec (obuf);

   aubio_cleanup ();

@@ -142,6 +146,9 @@

   if (usejack) {

 #ifdef HAVE_JACK

+    ev.size = 3;

+    ev.buffer = malloc (3 * sizeof (jack_midi_data_t));

+    ev.time = 0; // send it now

     debug ("Jack activation ...\n");

     aubio_jack_activate (jack_setup, process_func);

     debug ("Processing (Ctrl+C to quit) ...\n");

@@ -185,10 +192,6 @@

 send_noteon (smpl_t pitch, smpl_t velo)

 {

 #ifdef HAVE_JACK

-  jack_midi_event_t ev;

-  ev.size = 3;

-  ev.buffer = malloc (3 * sizeof (jack_midi_data_t)); // FIXME

-  ev.time = 0;

   if (usejack) {

     ev.buffer[2] = velo;

     ev.buffer[1] = pitch;