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+/********************************************************************
+ * *
+ * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
+ * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
+ * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
+ * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
+ * *
+ * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001 *
+ * by the XIPHOPHORUS Company http://www.xiph.org/ *
+ * *
+ ********************************************************************
+
+ function: fft transform
+ last mod: $Id$
+
+ ********************************************************************/
+/**
+ @file smallft.h
+ @brief Discrete Rotational Fourier Transform (DRFT)
+*/
+
+#ifndef _V_SMFT_H_
+#define _V_SMFT_H_
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Discrete Rotational Fourier Transform lookup */
+struct drft_lookup{
+ int n;
+ float *trigcache;
+ int *splitcache;
+};
+
+extern void spx_drft_forward(struct drft_lookup *l,float *data);
+extern void spx_drft_backward(struct drft_lookup *l,float *data);
+extern void spx_drft_init(struct drft_lookup *l,int n);
+extern void spx_drft_clear(struct drft_lookup *l);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif