new files from sakari, missed last time

git-svn-id: svn://localhost/ardour2/branches/3.0@3740 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 101 insertions, 0 deletions

diff --git a/libs/ardour/ardour/graph.h b/libs/ardour/ardour/graph.h
new file mode 100644
index 0000000000..80b5a9fe11
--- /dev/null
+++ b/libs/ardour/ardour/graph.h
@@ -0,0 +1,101 @@
+/*
+    Copyright (C) 2008 Paul Davis
+    Author: Sakari Bergen
+
+    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_graph_h__
+#define __ardour_graph_h__
+
+#include <boost/shared_ptr.hpp>
+
+#include <ardour/types.h>
+
+namespace ARDOUR
+{
+
+/// Takes data in
+template <typename T>
+class GraphSink  {
+  public:
+	GraphSink () : end_of_input (false) {}
+	virtual ~GraphSink () { end_of_input = false; }
+	
+	// writes data and return number of frames written
+	virtual nframes_t write (T * data, nframes_t frames) = 0;
+	
+	// Notifies end of input. All left over data must be written at this stage
+	virtual void set_end_of_input (bool state = true)
+	{
+		end_of_input = state;
+	}
+
+  protected:
+	bool end_of_input;
+};
+
+/// is a source for data
+template <typename T>
+class GraphSource  {
+  public:
+	GraphSource () {}
+	virtual ~GraphSource () {}
+	
+	virtual nframes_t read (T * data, nframes_t frames) = 0;
+};
+
+/// Takes data in, processes it and passes it on to another sink
+template <typename TIn, typename TOut>
+class GraphSinkVertex : public GraphSink<TIn> {
+  public:
+	GraphSinkVertex () {}
+	virtual ~GraphSinkVertex () {}
+	
+	void pipe_to (boost::shared_ptr<GraphSink<TOut> > dest) {
+		piped_to = dest;
+	}
+	
+	nframes_t write (TIn * data, nframes_t frames)
+	{
+		if (!piped_to) {
+			return -1;
+		}
+		return process (data, frames);
+	}	
+	
+	virtual void set_end_of_input (bool state = true)
+	{
+		if (!piped_to) {
+			return;
+		}
+		piped_to->set_end_of_input (state);
+		GraphSink<TIn>::end_of_input = state;
+	}
+	
+  protected:
+	boost::shared_ptr<GraphSink<TOut> > piped_to;
+	
+	/* process must process data,
+	   use piped_to->write to write the data
+	   and return number of frames written */
+	virtual nframes_t process (TIn * data, nframes_t frames) = 0;
+};
+
+} // namespace ARDOUR
+
+#endif /* __ardour_graph_h__ */
+