LTC (slave&gen): no reset on graph-change

fixes issues with transport stop/start
when making connections with jack1 while slaved to LTC

git-svn-id: svn://localhost/ardour2/branches/3.0@13356 d708f5d6-7413-0410-9779-e7cbd77b26cf

4 files changed, 32 insertions, 16 deletions

diff --git a/libs/ardour/ardour/session.h b/libs/ardour/ardour/session.h
index 5ef7d21bda..f359411846 100644
--- a/libs/ardour/ardour/session.h
+++ b/libs/ardour/ardour/session.h
@@ -1207,6 +1207,7 @@ class Session : public PBD::StatefulDestructible, public PBD::ScopedConnectionLi
 	void ltc_tx_initialize();
 	void ltc_tx_cleanup();
 	void ltc_tx_reset();
+	void ltc_tx_resync_latency();
 	void ltc_tx_recalculate_position();
 	void ltc_tx_send_time_code_for_cycle (framepos_t, framepos_t, double, double, pframes_t nframes);
 #endif
diff --git a/libs/ardour/ardour/slave.h b/libs/ardour/ardour/slave.h
index 0ff1da7884..f864bee636 100644
--- a/libs/ardour/ardour/slave.h
+++ b/libs/ardour/ardour/slave.h
@@ -356,6 +356,7 @@ public:
 	bool detect_ltc_fps(int, bool);
 	bool equal_ltc_frame_time(LTCFrame *a, LTCFrame *b);
 	void reset();
+	void resync_latency();
 
 	Session&       session;
 	bool           did_reset_tc_format;
diff --git a/libs/ardour/ltc_slave.cc b/libs/ardour/ltc_slave.cc
index 12386eeb18..4f6f77ce1f 100644
--- a/libs/ardour/ltc_slave.cc
+++ b/libs/ardour/ltc_slave.cc
@@ -61,8 +61,8 @@ LTC_Slave::LTC_Slave (Session& s)
 
 	decoder = ltc_decoder_create((int) frames_per_ltc_frame, 128 /*queue size*/);
 	reset();
-	session.Xrun.connect_same_thread (port_connections, boost::bind (&LTC_Slave::reset, this));
-	session.engine().GraphReordered.connect_same_thread (port_connections, boost::bind (&LTC_Slave::reset, this));
+	session.Xrun.connect_same_thread (port_connections, boost::bind (&LTC_Slave::resync_latency, this));
+	session.engine().GraphReordered.connect_same_thread (port_connections, boost::bind (&LTC_Slave::resync_latency, this));
 }
 
 LTC_Slave::~LTC_Slave()
@@ -95,6 +95,18 @@ LTC_Slave::ok() const
 }
 
 void
+LTC_Slave::resync_latency()
+{
+	DEBUG_TRACE (DEBUG::LTC, "LTC resync()\n");
+	engine_dll_initstate = 0;
+
+	if (session.ltc_output_io()) { /* check if Port exits */
+		boost::shared_ptr<Port> ltcport = session.ltc_input_port();
+		ltcport->get_connected_latency_range(ltc_slave_latency, false);
+	}
+}
+
+void
 LTC_Slave::reset()
 {
 	DEBUG_TRACE (DEBUG::LTC, "LTC reset()\n");
@@ -103,11 +115,7 @@ LTC_Slave::reset()
 	transport_direction = 0;
 	ltc_speed = 0;
 	engine_dll_initstate = 0;
-
-	if (session.ltc_output_io()) { /* check if Port exits */
-		boost::shared_ptr<Port> ltcport = session.ltc_input_port();
-		ltcport->get_connected_latency_range(ltc_slave_latency, false);
-	}
+	resync_latency();
 }
 
 void
diff --git a/libs/ardour/session_ltc.cc b/libs/ardour/session_ltc.cc
index dd2ddb5692..b7044d28a4 100644
--- a/libs/ardour/session_ltc.cc
+++ b/libs/ardour/session_ltc.cc
@@ -58,8 +58,8 @@ Session::ltc_tx_initialize()
 	ltc_enc_buf = (ltcsnd_sample_t*) calloc((nominal_frame_rate() / 23), sizeof(ltcsnd_sample_t));
 	ltc_speed = 0;
 	ltc_tx_reset();
-	Xrun.connect_same_thread (*this, boost::bind (&Session::ltc_tx_reset, this));
-	engine().GraphReordered.connect_same_thread (*this, boost::bind (&Session::ltc_tx_reset, this));
+	Xrun.connect_same_thread (*this, boost::bind (&Session::ltc_tx_resync_latency, this));
+	engine().GraphReordered.connect_same_thread (*this, boost::bind (&Session::ltc_tx_resync_latency, this));
 }
 
 void
@@ -72,6 +72,18 @@ Session::ltc_tx_cleanup()
 }
 
 void
+Session::ltc_tx_resync_latency()
+{
+	DEBUG_TRACE (DEBUG::LTC, "LTC TX resync latency\n");
+	if (!deletion_in_progress()) {
+		boost::shared_ptr<Port> ltcport = ltc_output_port();
+		if (ltcport) {
+			ltcport->get_connected_latency_range(ltc_out_latency, true);
+		}
+	}
+}
+
+void
 Session::ltc_tx_reset()
 {
 	DEBUG_TRACE (DEBUG::LTC, "LTC TX reset\n");
@@ -80,13 +92,7 @@ Session::ltc_tx_reset()
 	ltc_buf_off = 0;
 	ltc_enc_byte = 0;
 	ltc_enc_cnt = 0;
-
-	if (!deletion_in_progress()) {
-		boost::shared_ptr<Port> ltcport = ltc_output_port();
-		if (ltcport) {
-			ltcport->get_connected_latency_range(ltc_out_latency, true);
-		}
-	}
+	ltc_tx_resync_latency();
 }
 
 void