inital checkin of spandsp from http://www.soft-switch.org/downloads/snapshots/spandsp/spandsp-20080829.tar.gz

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@9425 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/spandsp/tests/echo_monitor.h

@@ -0,0 +1,62 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * echo_monitor.h - Display echo canceller status, using the FLTK toolkit.
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2004 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: echo_monitor.h,v 1.12 2008/04/26 13:39:16 steveu Exp $
+ */
+
+/*! \page echo_monitor_page Echo canceller performance monitoring
+\section echo_monitor_page_sec_1 What does it do?
+This code controls a GUI window, which provides monitoring of the internal status
+of a time domain echo canceller. It shows, graphically:
+
+    - the spectrum of the received signal.
+    - the line model in use (when a known line model is being used).
+    - the adapted coefficients of the canceller.
+
+\section echo_monitor_page_sec_2 How does it work?
+This code uses the FLTK cross platform GUI toolkit. It works on X11 and Windows platforms.
+In addition to the basic FLTK toolkit, fltk_cartesian is also required.
+*/
+
+#if !defined(_ECHO_MONITOR_H_)
+#define _ECHO_MONITOR_H_
+
+#if defined(__cplusplus)
+extern "C"
+{
+#endif
+
+int start_echo_can_monitor(int len);
+int echo_can_monitor_can_update(const int16_t *coeffs, int len);
+int echo_can_monitor_line_model_update(const int32_t *coeffs, int len);
+int echo_can_monitor_line_spectrum_update(const int16_t amp[], int len);
+void echo_can_monitor_wait_to_end(void);
+void echo_can_monitor_update_display(void);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif
+/*- End of file ------------------------------------------------------------*/