From 30755b92afeae5a5a32860b4f4297180f6d3398d Mon Sep 17 00:00:00 2001
From: John Glover <glover.john@gmail.com>
Date: Mon, 18 Oct 2010 17:32:05 +0100
Subject: Moved project over to Git

---
 sms/transforms.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 sms/transforms.c

(limited to 'sms/transforms.c')

diff --git a/sms/transforms.c b/sms/transforms.c
new file mode 100644
index 0000000..bd15e47
--- /dev/null
+++ b/sms/transforms.c
@@ -0,0 +1,57 @@
+/* 
+ * 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);
+}
-- 
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