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+/***************************  Fraunhofer IIS FDK Tools  **********************
+
+                        (C) Copyright Fraunhofer IIS (2003)
+                               All Rights Reserved
+
+    Please be advised that this software and/or program delivery is
+    Confidential Information of Fraunhofer and subject to and covered by the
+
+    Fraunhofer IIS Software Evaluation Agreement
+    between Google Inc. and  Fraunhofer
+    effective and in full force since March 1, 2012.
+
+    You may use this software and/or program only under the terms and
+    conditions described in the above mentioned Fraunhofer IIS Software
+    Evaluation Agreement. Any other and/or further use requires a separate agreement.
+
+
+   $Id$
+   Author(s):   M. Lohwasser, M. Gayer
+   Description:
+
+   This software and/or program is protected by copyright law and international
+   treaties. Any reproduction or distribution of this software and/or program,
+   or any portion of it, may result in severe civil and criminal penalties, and
+   will be prosecuted to the maximum extent possible under law.
+
+******************************************************************************/
+
+#ifndef _FFT_RAD2_H
+#define _FFT_RAD2_H
+
+
+#include "common_fix.h"
+
+/**
+ * \brief Performe an inplace  complex valued FFT of 2^n length
+ *
+ * \param x Input/Output data buffer. The input data must have at least 1 bit scale headroom.
+ *          The values are interleaved, real/imag pairs.
+ * \param ldn log2 of FFT length
+ * \param trigdata Pointer to a sinetable of a length of at least (2^ldn)/2 sine values.
+ * \param trigDataSize length of the sinetable "trigdata".
+ */
+void dit_fft(FIXP_DBL *x, const INT ldn, const FIXP_STP *trigdata, const INT trigDataSize) ;
+
+/**
+ * \brief Performe an inplace complex valued inverse FFT of 2^n length
+ *
+ * \param x Input/Output data buffer. The input data must have at least 1 bit scale headroom.
+ *          The values are interleaved, real/imag pairs.
+ * \param ldn log2 of FFT length
+ * \param trigdata Pointer to a sinetable of a length of at least (2^ldn)/2 sine values.
+ * \param trigDataSize length of the sinetable "trigdata".
+ */
+void dit_ifft(FIXP_DBL *x, const INT ldn, const FIXP_STP *trigdata, const INT trigDataSize) ;
+
+/* Rest of the world. */
+
+#define SCALEFACTOR2048       10
+#define SCALEFACTOR1024        9
+#define SCALEFACTOR512         8
+#define SCALEFACTOR256         7
+#define SCALEFACTOR128         6
+#define SCALEFACTOR64          5
+#define SCALEFACTOR32          4
+#define SCALEFACTOR16          3
+#define SCALEFACTOR8           2
+#define SCALEFACTOR4           1
+#define SCALEFACTOR2           1
+
+#endif /* _FFT_RAD2_H */
+