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examples/aubioonset.c: use seconds for minioi

--- a/doc/aubioonset.txt

+++ b/doc/aubioonset.txt

@@ -52,8 +52,8 @@

   values imply more onsets detected. Increasing this threshold should reduce

   the number of incorrect detections. Defaults to 0.3.

-  -M, --minioi value  Set the minimum inter-onset interval, in millisecond,

-  the shortest interval between two consecutive onsets. Defaults to 12.

+  -M, --minioi value  Set the minimum inter-onset interval, in seconds, the

+  shortest interval between two consecutive onsets. Defaults to 0.020

   -s, --silence sil  Set the silence threshold, in dB, under which the onset

   will not be detected. A value of -20.0 would eliminate most onsets but the

--- a/examples/aubioonset.c

+++ b/examples/aubioonset.c

@@ -75,7 +75,7 @@

   if (silence_threshold != -90.)

     aubio_onset_set_silence (o, silence_threshold);

   if (onset_minioi != 0.)

-    aubio_onset_set_minioi_ms (o, onset_minioi);

+    aubio_onset_set_minioi_s (o, onset_minioi);

   onset = new_fvec (1);

--- a/examples/parse_args.h

+++ b/examples/parse_args.h

@@ -93,7 +93,7 @@

       "       -t      --onset-threshold  set onset detection threshold\n"

       "                 a value between 0.1 (more detections) and 1 (less); default=0.3\n"

       "       -M      --minioi           set minimum inter-onset interval\n"

-      "                 a value in millisecond; default=12.\n"

+      "                 a value in second; default=0.012\n"

 #endif /* PROG_HAS_ONSET */

 #ifdef PROG_HAS_PITCH

       "       -p      --pitch            select pitch detection algorithm\n"

@@ -231,7 +231,7 @@

       case 't':                /* threshold value for onset */

         onset_threshold = (smpl_t) atof (optarg);

         break;

-      case 'M':                /* threshold value for onset */

+      case 'M':                /* minimum inter-onset-interval */

         onset_minioi = (smpl_t) atof (optarg);

         break;

       case 'p':