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diff --git a/cinelerra-5.1/cinelerra/dcoffset.C b/cinelerra-5.1/cinelerra/dcoffset.C
new file mode 100644
index 00000000..274c3395
--- /dev/null
+++ b/cinelerra-5.1/cinelerra/dcoffset.C
@@ -0,0 +1,88 @@
+
+/*
+ * CINELERRA
+ * Copyright (C) 2008 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 "bcprogressbox.h"
+#include "dcoffset.h"
+#include "language.h"
+#include "mutex.h"
+#include "recordgui.h"
+
+
+
+DC_Offset::DC_Offset()
+ : Thread()
+{
+	getting_dc_offset = 0;
+	for(int i = 0; i < MAXCHANNELS; i++) dc_offset[i] = 0;
+	dc_offset_lock = new Mutex;
+}
+
+DC_Offset::~DC_Offset()
+{
+	delete dc_offset_lock;
+}
+
+void DC_Offset::calibrate_dc_offset(int *output, RecordGUIDCOffsetText **dc_offset_text, int input_channels)
+{
+	this->output = output;
+	this->dc_offset_text = dc_offset_text;
+	this->input_channels = input_channels;
+	start();
+}
+
+
+void DC_Offset::run()
+{
+// thread out progress box
+	progress = new BC_ProgressBox((int)BC_INFINITY,
+		(int)BC_INFINITY,
+		_("DC Offset"),
+		256000);
+	progress->start();
+
+	dc_offset_lock->lock();
+	dc_offset_count = 0;
+	for(int i = 0; i < input_channels; i++)
+	{
+		dc_offset_total[i] = 0;
+		dc_offset[i] = 0;
+	}
+	getting_dc_offset = 1;
+
+	dc_offset_lock->lock();       // wait for result
+	dc_offset_lock->unlock();
+
+// thread in progress box
+	progress->stop_progress();
+	delete progress;
+
+	char string[256];
+	int i;
+
+// update interface
+	for(i = 0; i < input_channels; i++) output[i] = dc_offset[i];
+	for(i = 0; i < input_channels; i++)
+	{
+		sprintf(string, "%d", dc_offset[i]);
+		dc_offset_text[i]->update(string);
+	}
+}
+