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[timestretch] validate input hopsize and samplerate

--- a/src/effects/timestretch_rubberband.c

+++ b/src/effects/timestretch_rubberband.c

@@ -65,6 +65,16 @@

   p->hopsize = hopsize;

   p->pitchscale = 1.;

+  if ((sint_t)hopsize <= 0) {

+    AUBIO_ERR("timestretch: hopsize should be > 0, got %d\n", hopsize);

+    goto beach;

+  }

+

+  if ((sint_t)samplerate <= 0) {

+    AUBIO_ERR("timestretch: samplerate should be > 0, got %d\n", samplerate);

+    goto beach;

+  }

+

   if (stretchratio <= MAX_STRETCH_RATIO && stretchratio >= MIN_STRETCH_RATIO) {

     p->stretchratio = stretchratio;

   } else {