1 files changed, 73 insertions, 0 deletions
diff --git a/arts/midi/audiotimer.h b/arts/midi/audiotimer.h
new file mode 100644
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--- /dev/null
+++ b/arts/midi/audiotimer.h
@@ -0,0 +1,73 @@
+    /*
+
+    Copyright (C) 2002 Stefan Westerfeld
+                       stefan@space.twc.de
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+  
+    This library 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
+    Library General Public License for more details.
+   
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+    Boston, MA 02111-1307, USA.
+
+    */
+#ifndef AUDIOTIMER_H
+#define AUDIOTIMER_H
+
+#include "artsmidi.h"
+#include "artsflow.h"
+#include "stdsynthmodule.h"
+#include "miditimercommon.h"
+#include "flowsystem.h"
+
+namespace Arts {
+
+/**
+ * EXPERIMENTAL (this interface will probably not stay this way) way to handle
+ * audio based time stamps. Callback interface.
+ */
+class AudioTimerCallback {
+public:
+	virtual void updateTime() = 0;
+};
+
+/**
+ * EXPERIMENTAL (this interface will probably not stay this way) way to handle
+ * audio based time stamps. Timer class for audio timestamps.
+ */
+class AudioTimer : public SynthModule_skel, public StdSynthModule
+				   /* we are a SynthModule to get the timing */
+{
+protected:
+	AudioTimer();
+	virtual ~AudioTimer();
+
+	std::list<AudioTimerCallback *> callbacks;
+
+	long samples;	/* at most samplingRate, overflow goes in seconds */
+	long seconds;
+
+public:
+	// allocation: share one AudioTimer for everbody who needs one
+	static AudioTimer *subscribe();
+	void unsubscribe() { _release(); }
+
+	void notify(const Notification& n);
+	TimeStamp time();
+	void calculateBlock(unsigned long samples);
+
+	void addCallback(AudioTimerCallback *callback);
+	void removeCallback(AudioTimerCallback *callback);
+};
+
+}
+
+#endif