--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.6pre17/src/spandsp/swept_tone.h	Fri Jun 25 15:50:58 2010 +0200
@@ -0,0 +1,59 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * swept_tone.h - Swept tone generation
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2009 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: swept_tone.h,v 1.1 2009/09/22 12:54:33 steveu Exp $
+ */
+
+/*! \file */
+
+#if !defined(_SPANDSP_SWEPT_TONE_H_)
+#define _SPANDSP_SWEPT_TONE_H_
+
+/*! \page swept_tone_page The swept tone generator
+\section swept_tone_page_sec_1 What does it do?
+*/
+
+typedef struct swept_tone_state_s swept_tone_state_t;
+
+#if defined(__cplusplus)
+extern "C"
+{
+#endif
+
+SPAN_DECLARE(swept_tone_state_t *) swept_tone_init(swept_tone_state_t *s, float start, float end, float level, int duration, int repeating);
+
+SPAN_DECLARE(int) swept_tone(swept_tone_state_t *s, int16_t amp[], int len);
+
+SPAN_DECLARE(float) swept_tone_current_frequency(swept_tone_state_t *s);
+
+SPAN_DECLARE(int) swept_tone_release(swept_tone_state_t *s);
+
+SPAN_DECLARE(int) swept_tone_free(swept_tone_state_t *s);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif
+/*- End of file ------------------------------------------------------------*/