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src/spectral/fft.c: use prefixed aubio_ooura_rdft

--- a/src/spectral/fft.c

+++ b/src/spectral/fft.c

@@ -114,7 +114,7 @@

 #else                         // using OOURA

 // let's use ooura instead

-extern void rdft(int, int, smpl_t *, int *, smpl_t *);

+extern void aubio_ooura_rdft(int, int, smpl_t *, int *, smpl_t *);

 #endif /* HAVE_ACCELERATE */

 #endif /* HAVE_FFTW3 */

@@ -282,7 +282,7 @@

   smpl_t scale = 1./2.;

   aubio_vDSP_vsmul(compspec->data, 1, &scale, compspec->data, 1, s->fft_size);

 #else                         // using OOURA

-  rdft(s->winsize, 1, s->in, s->ip, s->w);

+  aubio_ooura_rdft(s->winsize, 1, s->in, s->ip, s->w);

   compspec->data[0] = s->in[0];

   compspec->data[s->winsize / 2] = s->in[1];

   for (i = 1; i < s->fft_size - 1; i++) {

@@ -340,7 +340,7 @@

     s->out[2 * i] = compspec->data[i];

     s->out[2 * i + 1] = - compspec->data[s->winsize - i];

   }

-  rdft(s->winsize, -1, s->out, s->ip, s->w);

+  aubio_ooura_rdft(s->winsize, -1, s->out, s->ip, s->w);

   for (i=0; i < s->winsize; i++) {

     output->data[i] = s->out[i] * scale;

   }