1 files changed, 57 insertions, 0 deletions
diff --git a/src/sms/transforms.c b/src/sms/transforms.c
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+++ b/src/sms/transforms.c
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+/* 
+ * Copyright (c) 2008 MUSIC TECHNOLOGY GROUP (MTG)
+ *                    UNIVERSITAT POMPEU FABRA 
+ * 
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of 
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * 
+ */
+/*! \file transforms.c 
+ * \brief routines for different Fast Fourier Transform Algorithms
+ *
+ */
+
+#include "sms.h"
+#include "OOURA.h"
+
+static int ip[NMAXSQRT +2];
+static sfloat w[NMAX * 5 / 4];
+
+/*! \brief Forward Fast Fourier Transform
+ *
+ * function to call the OOURA routines to calculate
+ * the forward FFT. Operation is in place.
+ * \todo if sizeFft != power of 2, there is a silent crash.. cuidado!
+ *
+ * \param sizeFft size of the FFT in samples (must be a power of 2 >= 2)
+ * \param pArray  pointer to real array (n >= 2, n = power of 2)
+ */
+void sms_fft(int sizeFft, sfloat *pArray)
+{ 
+    rdft(sizeFft, 1, pArray, ip, w);
+}
+
+/*! \brief Inverse Forward Fast Fourier Transform
+ *
+ * function to call the OOURA routines to calculate
+ * the Inverse FFT. Operation is in place.
+ *
+ * \param sizeFft size of the FFT in samples (must be a power of 2 >= 2)
+ * \param pArray  pointer to real array (n >= 2, n = power of 2)
+ */
+void sms_ifft(int sizeFft, sfloat *pArray)
+{ 
+    rdft(sizeFft, -1, pArray, ip, w);
+}