add delayline implementaion (in prep for latency compensation)

1 files changed, 69 insertions, 0 deletions

diff --git a/libs/ardour/ardour/delayline.h b/libs/ardour/ardour/delayline.h
new file mode 100644
index 0000000000..56a6de0c63
--- /dev/null
+++ b/libs/ardour/ardour/delayline.h
@@ -0,0 +1,69 @@
+/*
+    Copyright (C) 2006, 2013 Paul Davis
+    Copyright (C) 2013, 2014 Robin Gareus <robin@gareus.org>
+
+    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.
+*/
+
+#ifndef __ardour_delayline_h__
+#define __ardour_delayline_h__
+
+#include "ardour/types.h"
+#include "ardour/processor.h"
+
+namespace ARDOUR {
+
+class BufferSet;
+class ChanCount;
+class Session;
+
+/** Meters peaks on the input and stores them for access.
+ */
+class LIBARDOUR_API DelayLine : public Processor {
+public:
+
+  DelayLine (Session& s, const std::string& name);
+	~DelayLine ();
+
+	bool display_to_user() const { return false; }
+
+	void run (BufferSet&, framepos_t, framepos_t, pframes_t, bool);
+	void set_delay(framecnt_t signal_delay);
+	framecnt_t get_delay() { return _pending_delay; }
+
+	bool configure_io (ChanCount in, ChanCount out);
+	bool can_support_io_configuration (const ChanCount& in, ChanCount& out);
+
+	void flush();
+	void realtime_handle_transport_stopped () { flush(); }
+	void realtime_locate () { flush(); }
+	void monitoring_changed() { flush(); }
+
+	XMLNode& state (bool full);
+
+private:
+	friend class IO;
+	framecnt_t _delay, _pending_delay;
+	framecnt_t _bsiz,  _pending_bsiz;
+	frameoffset_t _roff, _woff;
+	boost::shared_ptr<Sample> _buf;
+	boost::shared_ptr<Sample> _pending_buf;
+	boost::shared_ptr<MidiBuffer> _midi_buf;
+	bool _pending_flush;
+};
+
+} // namespace ARDOUR
+
+#endif // __ardour_meter_h__