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[examples] add quiet mode for performance measurements

--- a/examples/parse_args.h

+++ b/examples/parse_args.h

@@ -25,6 +25,7 @@

 #endif

 extern int verbose;

+extern int quiet;

 // input / output

 extern int usejack;

 extern char_t *source_uri;

@@ -127,6 +128,7 @@

       "       -V      --miditap-velo     MIDI velocity; default=65.\n"

 #endif /* defined(PROG_HAS_ONSET) && !defined(PROG_HAS_PITCH) */

 #endif /* defined(PROG_HAS_JACK) && defined(HAVE_JACK) */

+      "       -q      --quiet            be quiet\n"

       "       -v      --verbose          be verbose\n"

       "       -h      --help             display this message\n"

       );

@@ -141,7 +143,7 @@

 parse_args (int argc, char **argv)

 {

 #ifdef HAVE_GETOPT_H

-  const char *options = "hv"

+  const char *options = "hvq"

     "i:r:B:H:"

 #ifdef PROG_HAS_JACK

     "j"

@@ -173,6 +175,7 @@

   struct option long_options[] = {

     {"help",                  0, NULL, 'h'},

     {"verbose",               0, NULL, 'v'},

+    {"quiet",                 0, NULL, 'q'},

     {"input",                 1, NULL, 'i'},

     {"samplerate",            1, NULL, 'r'},

     {"bufsize",               1, NULL, 'B'},

@@ -225,6 +228,9 @@

         return -1;

       case 'v':                /* verbose */

         verbose = 1;

+        break;

+      case 'q':                /* quiet */

+        quiet = 1;

         break;

       case 'j':

         usejack = 1;

--- a/examples/utils.c

+++ b/examples/utils.c

@@ -32,6 +32,7 @@

 #endif /* HAVE_JACK */

 int verbose = 0;

+int quiet = 0;

 int usejack = 0;

 // input / output

 char_t *sink_uri = NULL;

@@ -169,7 +170,7 @@

       aubio_source_do (this_source, input_buffer, &read);

       process_func (input_buffer, output_buffer);

       // print to console if verbose or no output given

-      if (verbose || sink_uri == NULL) {

+      if ((verbose || sink_uri == NULL) && !quiet) {

         print();

       }

       if (this_sink) {