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src/pitch/pitchschmitt.c: move buffer to private structure, closes #8

--- a/src/pitch/pitchschmitt.c

+++ b/src/pitch/pitchschmitt.c

@@ -28,6 +28,7 @@

         uint_t rate;

         signed short int *schmittBuffer;

         signed short int *schmittPointer;

+        signed short int *buf;

 };

 aubio_pitchschmitt_t * new_aubio_pitchschmitt (uint_t size, uint_t samplerate)

@@ -35,6 +36,7 @@

   aubio_pitchschmitt_t * p = AUBIO_NEW(aubio_pitchschmitt_t);

   p->blockSize = size;

   p->schmittBuffer = AUBIO_ARRAY(signed short int,p->blockSize);

+  p->buf = AUBIO_ARRAY(signed short int,p->blockSize);

   p->schmittPointer = p->schmittBuffer;

   p->rate = samplerate;

   return p;

@@ -42,12 +44,11 @@

 smpl_t aubio_pitchschmitt_detect (aubio_pitchschmitt_t *p, fvec_t * input)

 {

-  signed short int buf[input->length];

   uint_t i;

   for (i=0; i<input->length; i++) {

-    buf[i] = input->data[0][i]*32768.;

+    p->buf[i] = input->data[0][i]*32768.;

   }

-  return aubio_schmittS16LE(p, input->length, buf);

+  return aubio_schmittS16LE(p, input->length, p->buf);

 }

 smpl_t aubio_schmittS16LE (aubio_pitchschmitt_t *p, uint_t nframes, signed short int *indata)