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src/onset/onset.c: avoid doubled onset at start

--- a/src/onset/onset.c

+++ b/src/onset/onset.c

@@ -68,7 +68,7 @@

     }

   } else {

     // we are at the beginning of the file, and we don't find silence

-    if (o->total_frames == 0 && aubio_silence_detection(input, o->silence) == 0) {

+    if (o->total_frames <= o->delay && o->last_onset < o ->minioi && aubio_silence_detection(input, o->silence) == 0) {

       //AUBIO_DBG ("beginning of file is not silent, marking as onset\n");

       isonset = o->delay / o->hop_size;

       o->last_onset = o->delay;