add finite state machine to control/manage transport state

[ardour.git] / libs / ardour / transport_master.cc

diff --git a/libs/ardour/transport_master.cc b/libs/ardour/transport_master.cc
index 9da4fe838275a030c2db1e04b0beb16479065f70..4d3aa82053d36eeb9c839fb67ebbec4538544dae 100644 (file)
--- a/libs/ardour/transport_master.cc
+++ b/libs/ardour/transport_master.cc
@@ -1,20 +1,20 @@
 /*
-    Copyright (C) 2002 Paul Davis
-
-    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.
-
+ * Copyright (C) 2018-2019 Paul Davis <paul@linuxaudiosystems.com>
+ * Copyright (C) 2018 Robin Gareus <robin@gareus.org>
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #include <vector>
@@ -74,6 +74,7 @@ TransportMaster::TransportMaster (SyncSource t, std::string const & name)
        , _sclock_synced (Properties::sclock_synced, false)
        , _collect (Properties::collect, true)
        , _connected (Properties::connected, false)
+       , port_node (X_(""))
 {
        register_properties ();
 
@@ -121,13 +122,6 @@ TransportMaster::speed_and_position (double& speed, samplepos_t& pos, samplepos_
                }
        }
 
-       lp = last.position;
-       when = last.timestamp;
-       speed = last.speed;
-       pos   = last.position + (now - last.timestamp) * last.speed;
-
-       DEBUG_TRACE (DEBUG::Slave, string_compose ("%1: speed_and_position @ %5 last @ %2 pos: %3 spd: %4\n", name(), last.timestamp, last.position, last.speed, now));
-
        lp = last.position;
        when = last.timestamp;
        speed = last.speed;
@@ -139,8 +133,8 @@ TransportMaster::speed_and_position (double& speed, samplepos_t& pos, samplepos_
 
        pos = last.position + (now - last.timestamp) * speed;
 
-       DEBUG_TRACE (DEBUG::Slave, string_compose ("%1 sync spd: %2 pos: %3 | last-pos: %4 | elapsed: %5\n",
-                                                  name(), speed, pos, last.position, (now - last.timestamp)));
+       DEBUG_TRACE (DEBUG::Slave, string_compose ("%1 sync spd: %2 pos: %3 | last-pos: %4 @  %7| elapsed: %5 | speed: %6\n",
+                                                  name(), speed, pos, last.position, (now - last.timestamp), speed, when));
 
        return true;
 }
@@ -267,7 +261,27 @@ TransportMaster::set_state (XMLNode const & node, int /* version */)
        XMLNode* pnode = node.child (X_("Port"));
 
        if (pnode) {
-               XMLNodeList const & children = pnode->children();
+               port_node = *pnode;
+
+               if (AudioEngine::instance()->running()) {
+                       connect_port_using_state ();
+               }
+       }
+
+       PropertyChanged (what_changed);
+
+       return 0;
+}
+
+void
+TransportMaster::connect_port_using_state ()
+{
+       if (!_port) {
+               create_port ();
+       }
+
+       if (_port) {
+               XMLNodeList const & children = port_node.children();
                for (XMLNodeList::const_iterator ci = children.begin(); ci != children.end(); ++ci) {
 
                        XMLProperty const *prop;
@@ -280,10 +294,6 @@ TransportMaster::set_state (XMLNode const & node, int /* version */)
                        }
                }
        }
-
-       PropertyChanged (what_changed);
-
-       return 0;
 }
 
 XMLNode&
@@ -367,21 +377,27 @@ TransportMaster::factory (SyncSource type, std::string const& name, bool removea
 
        DEBUG_TRACE (DEBUG::Slave, string_compose ("factory-construct %1 name %2 removeable %3\n", enum_2_string (type), name, removeable));
 
-       switch (type) {
-       case MTC:
-               tm.reset (new MTC_TransportMaster (name));
-               break;
-       case LTC:
-               tm.reset (new LTC_TransportMaster (name));
-               break;
-       case MIDIClock:
-               tm.reset (new MIDIClock_TransportMaster (name));
-               break;
-       case Engine:
-               tm.reset (new Engine_TransportMaster (*AudioEngine::instance()));
-               break;
-       default:
-               break;
+       try {
+               switch (type) {
+               case MTC:
+                       tm.reset (new MTC_TransportMaster (name));
+                       break;
+               case LTC:
+                       tm.reset (new LTC_TransportMaster (name));
+                       break;
+               case MIDIClock:
+                       tm.reset (new MIDIClock_TransportMaster (name));
+                       break;
+               case Engine:
+                       tm.reset (new Engine_TransportMaster (*AudioEngine::instance()));
+                       break;
+               default:
+                       break;
+               }
+       } catch (...) {
+               error << string_compose (_("Construction of transport master object of type %1 failed"), enum_2_string (type)) << endmsg;
+               std::cerr << string_compose (_("Construction of transport master object of type %1 failed"), enum_2_string (type)) << std::endl;
+               return boost::shared_ptr<TransportMaster>();
        }
 
        if (tm) {
@@ -451,7 +467,7 @@ TransportMasterViaMIDI::create_midi_port (std::string const & port_name)
 {
        boost::shared_ptr<Port> p;
 
-       if ((p = AudioEngine::instance()->register_input_port (DataType::MIDI, port_name)) == 0) {
+       if ((p = AudioEngine::instance()->register_input_port (DataType::MIDI, port_name, false, TransportMasterPort)) == 0) {
                return boost::shared_ptr<Port> ();
        }
 
@@ -497,4 +513,3 @@ TimecodeTransportMaster::set_fr2997 (bool yn)
                PropertyChanged (Properties::fr2997);
        }
 }
-