1 files changed, 112 insertions, 0 deletions
diff --git a/arts/midi/timestampmath.cc b/arts/midi/timestampmath.cc
new file mode 100644
index 00000000..ff33c280
--- /dev/null
+++ b/arts/midi/timestampmath.cc
@@ -0,0 +1,112 @@
+    /*
+
+    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.
+
+    */
+
+#include "timestampmath.h"
+#include <arts/debug.h>
+#include <stdio.h>
+
+using namespace std;
+
+namespace Arts {
+void timeStampInc(TimeStamp& t, const TimeStamp& delta)
+{
+	/* expect a normalized t, delta */
+	arts_return_if_fail(t.usec >= 0 && t.usec < 1000000);
+	arts_return_if_fail(delta.usec >= 0 && delta.usec < 1000000);
+
+	t.sec += delta.sec;
+	t.usec += delta.usec;
+
+	if (t.usec >= 1000000)
+	{
+		t.usec -= 1000000;
+		t.sec += 1;
+	}
+
+	arts_assert (t.usec >= 0 && t.usec < 1000000);
+}
+
+void timeStampDec(TimeStamp& t, const TimeStamp& delta)
+{
+	/* expect a normalized t, delta */
+	arts_return_if_fail(t.usec >= 0 && t.usec < 1000000);
+	arts_return_if_fail(delta.usec >= 0 && delta.usec < 1000000);
+
+	t.sec -= delta.sec;
+	t.usec -= delta.usec;
+
+	if(t.usec < 0)
+	{
+		t.usec += 1000000;
+		t.sec -= 1;
+	}
+
+	arts_assert(t.usec >= 0 && t.usec < 1000000);
+}
+
+string timeStampToString(const TimeStamp& t)
+{
+	arts_return_val_if_fail(t.usec >= 0 && t.usec < 1000000, "");
+
+	char buffer[1024];
+	if(t.sec < 0 && t.usec != 0)
+	{
+		sprintf(buffer, "-%d.%06d", -t.sec-1, 1000000-t.usec);
+	}
+	else
+	{
+		sprintf(buffer, "%d.%06d", t.sec, t.usec);
+	}
+	return buffer;
+}
+
+double timeStampToDouble(const TimeStamp& t)
+{
+	arts_return_val_if_fail(t.usec >= 0 && t.usec < 1000000, 0.0);
+
+	return double(t.sec) + double(t.usec)/1000000.0;
+}
+
+TimeStamp timeStampFromDouble(double d)
+{
+	TimeStamp t;
+
+	arts_return_val_if_fail(d >= 0, t);
+
+	t.sec = int(d);
+	d -= t.sec;
+	t.usec = int(d * 1000000.0);
+
+	return t;
+}
+
+TimeStamp timeStampMax(const TimeStamp& t1, const TimeStamp& t2)
+{
+	if(t1.sec > t2.sec)
+		return t1;
+	else if((t1.sec == t2.sec) && (t1.usec > t2.usec))
+		return t1;
+	else
+		return t2;
+}
+
+}