From c1e827cb48667e2744add1446c24162c9e6db730 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Sun, 25 Sep 2011 19:47:14 +0000
Subject: ardour has never done latency compensations on busses, so what was
 Route::check_initial_delay() doing? Moved to Track::check_initial_delay() -
 fixes loopback/play-along recording via the master (or other) busses

git-svn-id: svn://localhost/ardour2/branches/2.0-ongoing@10120 d708f5d6-7413-0410-9779-e7cbd77b26cf
---
 libs/ardour/ardour/route.h |  2 +-
 libs/ardour/ardour/track.h |  2 ++
 libs/ardour/route.cc       | 33 ++++++---------------------------
 libs/ardour/track.cc       | 31 +++++++++++++++++++++++++++++++
 4 files changed, 40 insertions(+), 28 deletions(-)

diff --git a/libs/ardour/ardour/route.h b/libs/ardour/ardour/route.h
index 75dfdd8fb0..f026bb0d46 100644
--- a/libs/ardour/ardour/route.h
+++ b/libs/ardour/ardour/route.h
@@ -292,7 +292,7 @@ class Route : public IO
 	gain_t                    desired_solo_gain;
 	gain_t                    desired_mute_gain;
 
-	nframes_t            check_initial_delay (nframes_t, nframes_t&);
+	virtual nframes_t check_initial_delay (nframes_t nframes, nframes_t&);
 
 	nframes_t           _initial_delay;
 	nframes_t           _roll_delay;
diff --git a/libs/ardour/ardour/track.h b/libs/ardour/ardour/track.h
index 69754eeb06..d5b3365c55 100644
--- a/libs/ardour/ardour/track.h
+++ b/libs/ardour/ardour/track.h
@@ -144,6 +144,8 @@ class Track : public Route
 	    Track& track;
 	};
 
+	nframes_t check_initial_delay (nframes_t nframes, nframes_t&);
+
 	//virtual void diskstream_record_enable_changed (void *src) = 0;
 	//virtual void diskstream_input_channel_changed (void *src) = 0;
 
diff --git a/libs/ardour/route.cc b/libs/ardour/route.cc
index 5df739bc44..72b5c33057 100644
--- a/libs/ardour/route.cc
+++ b/libs/ardour/route.cc
@@ -2347,34 +2347,13 @@ Route::no_roll (nframes_t nframes, nframes_t start_frame, nframes_t end_frame,
 }
 
 nframes_t
-Route::check_initial_delay (nframes_t nframes, nframes_t& transport_frame)
+Route::check_initial_delay (nframes_t nframes, nframes_t&)
 {
-	if (_roll_delay > nframes) {
-
-		_roll_delay -= nframes;
-		silence (nframes);
-		/* transport frame is not legal for caller to use */
-		return 0;
-
-	} else if (_roll_delay > 0) {
-
-		nframes -= _roll_delay;
-
-		silence (_roll_delay);
-
-		/* we've written _roll_delay of samples into the 
-		   output ports, so make a note of that for
-		   future reference.
-		*/
-
-		increment_output_offset (_roll_delay);
-
-		transport_frame += _roll_delay;
-
-		_roll_delay = 0;
-	}
-
-	return nframes;
+        /* no latency compensation via roll delay on busses ...
+           see Track::check_initial_delay() for the track 
+           implementation.
+        */
+        return nframes;
 }
 
 int
diff --git a/libs/ardour/track.cc b/libs/ardour/track.cc
index 679f9d2380..63254a36ea 100644
--- a/libs/ardour/track.cc
+++ b/libs/ardour/track.cc
@@ -209,3 +209,34 @@ Track::zero_diskstream_id_in_xml (XMLNode& node)
 		node.add_property ("diskstream-id", "0");
 	}
 }
+
+nframes_t
+Track::check_initial_delay (nframes_t nframes, nframes_t& transport_frame)
+{
+	if (_roll_delay > nframes) {
+
+		_roll_delay -= nframes;
+		silence (nframes);
+		/* transport frame is not legal for caller to use */
+		return 0;
+
+	} else if (_roll_delay > 0) {
+
+		nframes -= _roll_delay;
+
+		silence (_roll_delay);
+
+		/* we've written _roll_delay of samples into the 
+		   output ports, so make a note of that for
+		   future reference.
+		*/
+
+		increment_output_offset (_roll_delay);
+
+		transport_frame += _roll_delay;
+
+		_roll_delay = 0;
+	}
+
+	return nframes;
+}
-- 
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