Revert "remove unusued roll_delay member of DiskReader"

This reverts commit 92c2e06eb72950f91ca943a5219e2caeaeecda9f.

1 files changed, 7 insertions, 0 deletions

diff --git a/libs/ardour/ardour/disk_reader.h b/libs/ardour/ardour/disk_reader.h
index cab4a33501..8e124a27dd 100644
--- a/libs/ardour/ardour/disk_reader.h
+++ b/libs/ardour/ardour/disk_reader.h
@@ -52,6 +52,9 @@ class LIBARDOUR_API DiskReader : public DiskIOProcessor
 	int overwrite_existing_buffers ();
 	void set_pending_overwrite (bool yn);
 
+	samplecnt_t roll_delay() const { return _roll_delay; }
+	void set_roll_delay (samplecnt_t);
+
 	virtual XMLNode& state (bool full);
 	int set_state (const XMLNode&, int version);
 
@@ -111,6 +114,10 @@ class LIBARDOUR_API DiskReader : public DiskIOProcessor
 	void playlist_ranges_moved (std::list< Evoral::RangeMove<samplepos_t> > const &, bool);
 
   private:
+	/** The number of samples by which this diskstream's output should be delayed
+	    with respect to the transport sample.  This is used for latency compensation.
+	*/
+	samplecnt_t   _roll_delay;
 	samplepos_t    overwrite_sample;
 	off_t         overwrite_offset;
 	bool          _pending_overwrite;