--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.3/spandsp-0.0.3/src/spandsp/complex.h	Fri Jun 25 16:00:21 2010 +0200
@@ -0,0 +1,364 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * complex.h
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2003 Steve Underwood
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id: complex.h,v 1.8 2006/10/24 13:45:28 steveu Exp $
+ */
+
+/*! \file */
+
+/*! \page complex_page Complex number support
+\section complex_page_sec_1 What does it do?
+Complex number support is part of the C99 standard. However, support for this
+in C compilers is still patchy. A set of complex number feaures is provided as
+a "temporary" measure, until native C language complex number support is
+widespread.
+*/
+
+#if !defined(_COMPLEX_H_)
+#define _COMPLEX_H_
+
+/*!
+    Floating complex type.
+*/
+typedef struct
+{
+    float re;
+    float im;
+} complexf_t;
+
+/*!
+    Floating complex type.
+*/
+typedef struct
+{
+    double re;
+    double im;
+} complex_t;
+
+#if defined(HAVE_LONG_DOUBLE)
+/*!
+    Long double complex type.
+*/
+typedef struct
+{
+    long double re;
+    long double im;
+} complexl_t;
+#endif
+
+/*!
+    Complex integer type.
+*/
+typedef struct
+{
+    int re;
+    int im;
+} icomplex_t;
+
+/*!
+    Complex 16 bit integer type.
+*/
+typedef struct
+{
+    int16_t re;
+    int16_t im;
+} i16complex_t;
+
+/*!
+    Complex 32 bit integer type.
+*/
+typedef struct
+{
+    int32_t re;
+    int32_t im;
+} i32complex_t;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static __inline__ complexf_t complex_setf(float re, float im)
+{
+    complexf_t z;
+
+    z.re = re;
+    z.im = im;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+
+static __inline__ complex_t complex_set(float re, float im)
+{
+    complex_t z;
+
+    z.re = re;
+    z.im = im;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+
+#if defined(HAVE_LONG_DOUBLE)
+static __inline__ complexl_t complex_setl(long double re, long double im)
+{
+    complexl_t z;
+
+    z.re = re;
+    z.im = im;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+#endif
+
+static __inline__ icomplex_t icomplex_set(int re, int im)
+{
+    icomplex_t z;
+
+    z.re = re;
+    z.im = im;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+
+static __inline__ complexf_t complex_addf(const complexf_t *x, const complexf_t *y)
+{
+    complexf_t z;
+
+    z.re = x->re + y->re;
+    z.im = x->im + y->im;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+
+static __inline__ complex_t complex_add(const complex_t *x, const complex_t *y)
+{
+    complex_t z;
+
+    z.re = x->re + y->re;
+    z.im = x->im + y->im;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+
+#if defined(HAVE_LONG_DOUBLE)
+static __inline__ complexl_t complex_addl(const complexl_t *x, const complexl_t *y)
+{
+    complexl_t z;
+
+    z.re = x->re + y->re;
+    z.im = x->im + y->im;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+#endif
+
+static __inline__ icomplex_t icomplex_add(const icomplex_t *x, const icomplex_t *y)
+{
+    icomplex_t z;
+
+    z.re = x->re + y->re;
+    z.im = x->im + y->im;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+
+static __inline__ complexf_t complex_subf(const complexf_t *x, const complexf_t *y)
+{
+    complexf_t z;
+
+    z.re = x->re - y->re;
+    z.im = x->im - y->im;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+
+static __inline__ complex_t complex_sub(const complex_t *x, const complex_t *y)
+{
+    complex_t z;
+
+    z.re = x->re - y->re;
+    z.im = x->im - y->im;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+
+#if defined(HAVE_LONG_DOUBLE)
+static __inline__ complexl_t complex_subl(const complexl_t *x, const complexl_t *y)
+{
+    complexl_t z;
+
+    z.re = x->re - y->re;
+    z.im = x->im - y->im;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+#endif
+
+static __inline__ icomplex_t icomplex_sub(const icomplex_t *x, const icomplex_t *y)
+{
+    icomplex_t z;
+
+    z.re = x->re - y->re;
+    z.im = x->im - y->im;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+
+static __inline__ complexf_t complex_mulf(const complexf_t *x, const complexf_t *y)
+{
+    complexf_t z;
+
+    z.re = x->re*y->re - x->im*y->im;
+    z.im = x->re*y->im + x->im*y->re;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+
+static __inline__ complex_t complex_mul(const complex_t *x, const complex_t *y)
+{
+    complex_t z;
+
+    z.re = x->re*y->re - x->im*y->im;
+    z.im = x->re*y->im + x->im*y->re;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+
+#if defined(HAVE_LONG_DOUBLE)
+static __inline__ complexl_t complex_mull(const complexl_t *x, const complexl_t *y)
+{
+    complexl_t z;
+
+    z.re = x->re*y->re - x->im*y->im;
+    z.im = x->re*y->im + x->im*y->re;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+#endif
+
+static __inline__ complexf_t complex_divf(const complexf_t *x, const complexf_t *y)
+{
+    complexf_t z;
+    float f;
+    
+    f = y->re*y->re + y->im*y->im;
+    z.re = ( x->re*y->re + x->im*y->im)/f;
+    z.im = (-x->re*y->im + x->im*y->re)/f;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+
+static __inline__ complex_t complex_div(const complex_t *x, const complex_t *y)
+{
+    complex_t z;
+    double f;
+    
+    f = y->re*y->re + y->im*y->im;
+    z.re = ( x->re*y->re + x->im*y->im)/f;
+    z.im = (-x->re*y->im + x->im*y->re)/f;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+
+#if defined(HAVE_LONG_DOUBLE)
+static __inline__ complexl_t complex_divl(const complexl_t *x, const complexl_t *y)
+{
+    complexl_t z;
+    long double f;
+    
+    f = y->re*y->re + y->im*y->im;
+    z.re = ( x->re*y->re + x->im*y->im)/f;
+    z.im = (-x->re*y->im + x->im*y->re)/f;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+#endif
+
+static __inline__ complexf_t complex_conjf(const complexf_t *x)
+{
+    complexf_t z;
+
+    z.re = x->re;
+    z.im = -x->im;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+
+static __inline__ complex_t complex_conj(const complex_t *x)
+{
+    complex_t z;
+
+    z.re = x->re;
+    z.im = -x->im;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+
+#if defined(HAVE_LONG_DOUBLE)
+static __inline__ complexl_t complex_conjl(const complexl_t *x)
+{
+    complexl_t z;
+
+    z.re = x->re;
+    z.im = -x->im;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+#endif
+
+static __inline__ icomplex_t icomplex_conj(const icomplex_t *x)
+{
+    icomplex_t z;
+
+    z.re = x->re;
+    z.im = -x->im;
+    return z;
+}
+/*- End of function --------------------------------------------------------*/
+
+static __inline__ float powerf(const complexf_t *x)
+{
+    return x->re*x->re + x->im*x->im;
+}
+/*- End of function --------------------------------------------------------*/
+
+static __inline__ double power(const complex_t *x)
+{
+    return x->re*x->re + x->im*x->im;
+}
+/*- End of function --------------------------------------------------------*/
+
+#if defined(HAVE_LONG_DOUBLE)
+static __inline__ long double powerl(const complexl_t *x)
+{
+    return x->re*x->re + x->im*x->im;
+}
+/*- End of function --------------------------------------------------------*/
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+/*- End of file ------------------------------------------------------------*/