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diff --git a/libs/ardour/ardour/jack_audio_port.h b/libs/ardour/ardour/jack_audio_port.h
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+++ b/libs/ardour/ardour/jack_audio_port.h
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+/*
+    Copyright (C) 2002 Paul Davis 
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+    $Id: port.h 712 2006-07-28 01:08:57Z drobilla $
+*/
+
+#ifndef __ardour_jack_audio_port_h__
+#define __ardour_jack_audio_port_h__
+
+#include <sigc++/signal.h>
+#include <pbd/failed_constructor.h>
+#include <ardour/ardour.h>
+#include <ardour/jack_port.h>
+#include <ardour/audio_port.h>
+
+namespace ARDOUR {
+
+class AudioEngine;
+class JackAudioPort : public JackPort, public BaseAudioPort {
+   public:
+	void cycle_start (nframes_t nframes, nframes_t offset) {
+		_buffer->set_data ((Sample*) jack_port_get_buffer (_port, nframes) + offset, nframes);
+	}
+
+	int reestablish ();
+
+  protected:
+	friend class AudioPort;
+
+	JackAudioPort (const std::string& name, Flags flags, AudioBuffer* buf);
+
+	AudioBuffer* _source_buffer;
+};
+ 
+} // namespace ARDOUR
+
+#endif /* __ardour_jack_audio_port_h__ */