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+++ b/sc2src/watcher.h
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+/* Copyright (C) 2017 J.F.Dockes
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   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.,
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#ifndef _WATCHER_H_INCLUDED_
+#define _WATCHER_H_INCLUDED_
+
+#include <string>
+
+#include "conftree.h"
+
+/** 
+  Start the watcher thread. If configured, it polls at regular
+  intervals for audio activity (indicated by the queue packet counter,
+  and, depending on configuration parameters, executes the external
+  command with an argument of 'off' if the queue was idle for more
+  than idlesecs seconds, and again with an argument of 'on' as soon as
+  it detects new activity and/or closes/opens the alsa device */
+extern void startWatcher(ConfSimple& config);
+
+#endif /* _WATCHER_H_INCLUDED_ */