diff --git a/libs/ardour/ardour/source.h b/libs/ardour/ardour/source.h
index f69f6bf740..b803e7a0d2 100644
--- a/libs/ardour/ardour/source.h
+++ b/libs/ardour/ardour/source.h
@@ -38,6 +38,7 @@
 #include "ardour/ardour.h"
 #include "ardour/session_object.h"
 #include "ardour/data_type.h"
+#include "ardour/segment_descriptor.h"
 
 namespace ARDOUR {
 
@@ -145,6 +146,9 @@ public:
 	void set_captured_for (std::string str) { _captured_for = str; }
 	std::string captured_for() const { return _captured_for; }
 
+	SegmentDescriptor* get_segment_descriptor (TimelineRange const &);
+	int set_segment_descriptor (SegmentDescriptor const &);
+
   protected:
 	DataType            _type;
 	Flag                _flags;
@@ -161,6 +165,9 @@ public:
 	XrunPositions      _xruns;
 	CueMarkers         _cue_markers;
 
+	typedef std::vector<SegmentDescriptor> SegmentDescriptors;
+	SegmentDescriptors segment_descriptors;
+
 	mutable Glib::Threads::Mutex _lock;
 	mutable Glib::Threads::Mutex _analysis_lock;
 
diff --git a/libs/ardour/source.cc b/libs/ardour/source.cc
index df4657f68c..57860b4776 100644
--- a/libs/ardour/source.cc
+++ b/libs/ardour/source.cc
@@ -514,3 +514,15 @@ Source::empty () const
 {
 	return _length == timecnt_t();
 }
+
+SegmentDescriptor*
+Source::get_segment_descriptor (TimelineRange const & range)
+{
+	return 0;
+}
+
+int
+Source::set_segment_descriptor (SegmentDescriptor const & sr)
+{
+	return 0;
+}