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diff --git a/cinelerra-5.1/plugins/dcoffset/dcoffset.h b/cinelerra-5.1/plugins/dcoffset/dcoffset.h
new file mode 100644
index 00000000..d90111a0
--- /dev/null
+++ b/cinelerra-5.1/plugins/dcoffset/dcoffset.h
@@ -0,0 +1,63 @@
+
+/*
+ * CINELERRA
+ * Copyright (C) 2009 Adam Williams <broadcast at earthling dot net>
+ * 
+ * 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 GAIN_H
+#define GAIN_H
+
+class DCOffset;
+
+#include "pluginaclient.h"
+
+class DCOffsetConfig
+{
+public:
+	DCOffsetConfig();
+	int equivalent(DCOffsetConfig &that);
+	void copy_from(DCOffsetConfig &that);
+	void interpolate(DCOffsetConfig &prev, 
+		DCOffsetConfig &next, 
+		int64_t prev_frame, 
+		int64_t next_frame, 
+		int64_t current_frame);
+
+	double level;
+};
+
+class DCOffset : public PluginAClient
+{
+public:
+	DCOffset(PluginServer *server);
+	~DCOffset();
+
+	int process_buffer(int64_t size, 
+		Samples *buffer,
+		int64_t start_position,
+		int sample_rate);
+
+	const char* plugin_title();
+	int is_realtime();
+
+	int need_collection;
+	Samples *reference;
+	double offset;
+};
+
+#endif