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diff --git a/cinelerra-5.1/plugins/dcoffset/dcoffset.C b/cinelerra-5.1/plugins/dcoffset/dcoffset.C
new file mode 100644
index 00000000..8702ba5f
--- /dev/null
+++ b/cinelerra-5.1/plugins/dcoffset/dcoffset.C
@@ -0,0 +1,111 @@
+
+/*
+ * 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
+ * 
+ */
+
+#include "clip.h"
+#include "bchash.h"
+#include "dcoffset.h"
+#include "filexml.h"
+#include "language.h"
+#include "samples.h"
+#include "transportque.h"
+
+#include "vframe.h"
+
+#include <string.h>
+
+
+#define WINDOW_SIZE 65536
+
+REGISTER_PLUGIN(DCOffset)
+
+
+
+
+
+
+
+
+
+DCOffset::DCOffset(PluginServer *server)
+ : PluginAClient(server)
+{
+	need_collection = 1;
+	reference = 0;
+}
+
+DCOffset::~DCOffset()
+{
+	delete reference;
+}
+
+const char* DCOffset::plugin_title() { return _("DC Offset"); }
+int DCOffset::is_realtime() { return 1; }
+
+
+
+int DCOffset::process_buffer(int64_t size, 
+	Samples *buffer,
+	int64_t start_position,
+	int sample_rate)
+{
+	load_configuration();
+	double *buffer_samples = buffer->get_data();
+	double *reference_samples = !reference ? 0 : reference->get_data();
+	
+	if(need_collection)
+	{
+		if(!reference) {
+			reference = new Samples(WINDOW_SIZE);
+			reference_samples = reference->get_data();
+		}
+		int64_t collection_start = 0;
+		if(get_direction() == PLAY_REVERSE)
+			collection_start += WINDOW_SIZE;
+		read_samples(reference,
+			0,
+			sample_rate,
+			collection_start,
+			WINDOW_SIZE);
+		offset = 0;
+		for(int i = 0; i < WINDOW_SIZE; i++)
+		{
+			offset += reference_samples[i];
+		}
+		offset /= WINDOW_SIZE;
+		need_collection = 0;
+	}
+
+	read_samples(buffer,
+		0,
+		sample_rate,
+		start_position,
+		size);
+
+	for(int i = 0; i < size; i++)
+	{
+		buffer_samples[i] -= offset;
+	}
+
+	return 0;
+}
+
+
+