--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.6pre17/src/complex_filters.c	Fri Jun 25 15:50:58 2010 +0200
@@ -0,0 +1,112 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * complex_filters.c
+ *
+ * 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 Lesser General Public License version 2.1,
+ * 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser 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_filters.c,v 1.16 2009/02/03 16:28:39 steveu Exp $
+ */
+
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <inttypes.h>
+
+#include "spandsp/telephony.h"
+#include "spandsp/complex.h"
+#include "spandsp/complex_filters.h"
+
+SPAN_DECLARE(filter_t *) filter_create(fspec_t *fs)
+{
+    int i;
+    filter_t *fi;
+
+    if ((fi = (filter_t *) malloc(sizeof(*fi) + sizeof(float)*(fs->np + 1))))
+    {
+        fi->fs = fs;
+        fi->sum = 0.0;
+        /* Moving average filters only */
+        fi->ptr = 0;
+        for (i = 0;  i <= fi->fs->np;  i++)
+            fi->v[i] = 0.0;
+    }
+    return fi;
+}
+/*- End of function --------------------------------------------------------*/
+
+SPAN_DECLARE(void) filter_delete(filter_t *fi)
+{
+    if (fi)
+        free(fi);
+}
+/*- End of function --------------------------------------------------------*/
+
+SPAN_DECLARE(float) filter_step(filter_t *fi, float x)
+{
+    return fi->fs->fsf(fi, x);
+}
+/*- End of function --------------------------------------------------------*/
+
+SPAN_DECLARE(cfilter_t *) cfilter_create(fspec_t *fs)
+{
+    cfilter_t *cfi;
+
+    if ((cfi = (cfilter_t *) malloc(sizeof(*cfi))))
+    {
+        if ((cfi->ref = filter_create(fs)) == NULL)
+        {
+            free(cfi);
+            return NULL;
+        }
+        if ((cfi->imf = filter_create(fs)) == NULL)
+        {
+            free(cfi->ref);
+            free(cfi);
+            return NULL;
+        }
+    }
+    return cfi;
+}
+/*- End of function --------------------------------------------------------*/
+
+SPAN_DECLARE(void) cfilter_delete(cfilter_t *cfi)
+{
+    if (cfi)
+    {
+        filter_delete(cfi->ref);
+        filter_delete(cfi->imf);
+    }
+}
+/*- End of function --------------------------------------------------------*/
+
+SPAN_DECLARE(complexf_t) cfilter_step(cfilter_t *cfi, const complexf_t *z)
+{
+    complexf_t cc;
+    
+    cc.re = filter_step(cfi->ref, z->re);
+    cc.im = filter_step(cfi->imf, z->im);
+    return cc;
+}
+/*- End of function --------------------------------------------------------*/
+/*- End of file ------------------------------------------------------------*/