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src/tempo/tempo.c: add silence detection (closes #23), add old behavior in examples/aubiotrack.c

--- a/examples/aubiotrack.c

+++ b/examples/aubiotrack.c

@@ -70,6 +70,8 @@

   tempo_out = new_fvec(2);

   tempo = new_aubio_tempo(tempo_method, buffer_size, hop_size, samplerate);

+  // set silence threshold very low to output beats even during silence

+  // aubio_tempo_set_silence(tempo, -1000.);

   if (onset_threshold != 0.) aubio_tempo_set_threshold (tempo, onset_threshold);

   wavetable = new_aubio_wavetable (samplerate, hop_size);

--- a/src/tempo/tempo.c

+++ b/src/tempo/tempo.c

@@ -109,11 +109,9 @@

     if (o->blockpos == FLOOR(o->out->data[i])) {

       tempo->data[0] = o->out->data[i] - FLOOR(o->out->data[i]); /* set tactus */

       /* test for silence */

-      /*

       if (aubio_silence_detection(input, o->silence)==1) {

         tempo->data[0] = 0; // unset beat if silent

       }

-      */

       o->last_beat = o->total_frames + (uint_t)ROUND(tempo->data[0] * o->hop_size);

     }

   }