Unify the canvases by moving groups around rather than using set_scrolling_region...
[ardour.git] / gtk2_ardour / ardour_ui.cc
index c7051680db37278f8bf6dc06c25ab9b63b288015..ab4591177dafcecc6046835f5c309ba2d6e335b2 100644 (file)
@@ -22,6 +22,7 @@
 #include <fcntl.h>
 #include <signal.h>
 #include <unistd.h>
+#include <time.h>
 #include <cerrno>
 #include <fstream>
 
@@ -35,7 +36,6 @@
 #include <pbd/error.h>
 #include <pbd/basename.h>
 #include <pbd/compose.h>
-#include <pbd/misc.h>
 #include <pbd/pathscanner.h>
 #include <pbd/failed_constructor.h>
 #include <pbd/enumwriter.h>
@@ -64,6 +64,8 @@
 #include <ardour/port.h>
 #include <ardour/audio_track.h>
 
+typedef uint64_t microseconds_t;
+
 #include "actions.h"
 #include "ardour_ui.h"
 #include "public_editor.h"
 #include "add_route_dialog.h"
 #include "new_session_dialog.h"
 #include "about.h"
+#include "splash.h"
 #include "utils.h"
 #include "gui_thread.h"
 #include "theme_manager.h"
 #include "engine_dialog.h"
+#include "gain_meter.h"
+#include "route_time_axis.h"
 
 #include "i18n.h"
 
@@ -105,10 +110,6 @@ ARDOUR_UI::ARDOUR_UI (int *argcp, char **argvp[])
          preroll_clock (X_("preroll"), false, X_("PreRollClock"), true, true),
          postroll_clock (X_("postroll"), false, X_("PostRollClock"), true, true),
 
-         /* adjuster table */
-
-         adjuster_table (3, 3),
-
          /* preroll stuff */
 
          preroll_button (_("pre\nroll")),
@@ -161,11 +162,13 @@ ARDOUR_UI::ARDOUR_UI (int *argcp, char **argvp[])
        _auto_display_errors = false;
 #endif
 
-       if (getenv ("ARDOUR_DEBUG_UPDATES")) {
-               gdk_window_set_debug_updates (true);
-       }
-       
        about = 0;
+       splash = 0;
+
+       if (ARDOUR_COMMAND_LINE::session_name.length()) {       
+               /* only show this if we're not going to post the new session dialog */
+               show_splash ();
+       }
 
        if (theArdourUI == 0) {
                theArdourUI = this;
@@ -194,19 +197,10 @@ ARDOUR_UI::ARDOUR_UI (int *argcp, char **argvp[])
        have_disk_speed_dialog_displayed = false;
        _will_create_new_session_automatically = false;
        session_loaded = false;
-       loading_dialog = 0;
        last_speed_displayed = -1.0f;
+       ignore_dual_punch = false;
 
-       keybindings_path = ARDOUR::find_config_file ("ardour.bindings");
-       /* all changes go to the user directory */
-       user_keybindings_path = get_user_ardour_path ();
-       user_keybindings_path += '/';
-       user_keybindings_path += "ardour.bindings";
-
-       can_save_keybindings = false;
-
-       last_configure_time.tv_sec = 0;
-       last_configure_time.tv_usec = 0;
+       last_configure_time= 0;
 
        shuttle_grabbed = false;
        shuttle_fract = 0.0;
@@ -215,16 +209,25 @@ ARDOUR_UI::ARDOUR_UI (int *argcp, char **argvp[])
        shuttle_style_menu = 0;
        shuttle_unit_menu = 0;
 
-       gettimeofday (&last_peak_grab, 0);
-       gettimeofday (&last_shuttle_request, 0);
+        // We do not have jack linked in yet so;
+        
+       last_shuttle_request = last_peak_grab = 0; //  get_microseconds();
 
        ARDOUR::Diskstream::DiskOverrun.connect (mem_fun(*this, &ARDOUR_UI::disk_overrun_handler));
        ARDOUR::Diskstream::DiskUnderrun.connect (mem_fun(*this, &ARDOUR_UI::disk_underrun_handler));
 
+       /* handle dialog requests */
+
+       ARDOUR::Session::Dialog.connect (mem_fun(*this, &ARDOUR_UI::session_dialog));
+
        /* handle pending state with a dialog */
 
        ARDOUR::Session::AskAboutPendingState.connect (mem_fun(*this, &ARDOUR_UI::pending_state_dialog));
 
+       /* handle sr mismatch with a dialog */
+
+       ARDOUR::Session::AskAboutSampleRateMismatch.connect (mem_fun(*this, &ARDOUR_UI::sr_mismatch_dialog));
+
        /* lets get this party started */
 
        try {
@@ -236,6 +239,9 @@ ARDOUR_UI::ARDOUR_UI (int *argcp, char **argvp[])
                Config->set_current_owner (ConfigVariableBase::Interface);
                setup_profile ();
 
+               GainMeter::setup_slider_pix ();
+               RouteTimeAxisView::setup_slider_pix ();
+
        } catch (failed_constructor& err) {
                error << _("could not initialize Ardour.") << endmsg;
                // pass it on up
@@ -246,6 +252,8 @@ ARDOUR_UI::ARDOUR_UI (int *argcp, char **argvp[])
 
        keyboard = new Keyboard;
 
+       reset_dpi();
+
        starting.connect (mem_fun(*this, &ARDOUR_UI::startup));
        stopping.connect (mem_fun(*this, &ARDOUR_UI::shutdown));
 
@@ -261,6 +269,8 @@ ARDOUR_UI::create_engine ()
                return 0;
        }
 
+       loading_message (_("Starting audio engine"));
+
        try { 
                engine = new ARDOUR::AudioEngine (ARDOUR_COMMAND_LINE::jack_client_name);
 
@@ -326,7 +336,11 @@ ARDOUR_UI::post_engine ()
 
        /* set default clock modes */
 
-       primary_clock.set_mode (AudioClock::SMPTE);
+       if (Profile->get_sae()) {
+               primary_clock.set_mode (AudioClock::MinSec);
+       }  else {
+               primary_clock.set_mode (AudioClock::SMPTE);
+       }
        secondary_clock.set_mode (AudioClock::BBT);
 
        /* start the time-of-day-clock */
@@ -380,24 +394,27 @@ ARDOUR_UI::~ARDOUR_UI ()
        }
 }
 
+void
+ARDOUR_UI::pop_back_splash ()
+{
+       if (Splash::instance()) {
+               // Splash::instance()->pop_back();
+               Splash::instance()->hide ();
+       }
+}
+
 gint
 ARDOUR_UI::configure_timeout ()
 {
-       struct timeval now;
-       struct timeval diff;
-
-       if (last_configure_time.tv_sec == 0 && last_configure_time.tv_usec == 0) {
+       if (last_configure_time == 0) {
                /* no configure events yet */
                return TRUE;
        }
 
-       gettimeofday (&now, 0);
-       timersub (&now, &last_configure_time, &diff);
-
        /* force a gap of 0.5 seconds since the last configure event
         */
 
-       if (diff.tv_sec == 0 && diff.tv_usec < 500000) {
+       if (get_microseconds() - last_configure_time < 500000) {
                return TRUE;
        } else {
                have_configure_timeout = false;
@@ -410,7 +427,7 @@ gboolean
 ARDOUR_UI::configure_handler (GdkEventConfigure* conf)
 {
        if (have_configure_timeout) {
-               gettimeofday (&last_configure_time, 0);
+               last_configure_time = get_microseconds();
        } else {
                Glib::signal_timeout().connect (mem_fun(*this, &ARDOUR_UI::configure_timeout), 100);
                have_configure_timeout = true;
@@ -509,12 +526,20 @@ ARDOUR_UI::save_ardour_state ()
                Config->add_instant_xml (mnode, get_user_ardour_path());
        }
 
-       save_keybindings ();
+       Keyboard::save_keybindings ();
 }
 
 gint
 ARDOUR_UI::autosave_session ()
 {
+       if (g_main_depth() > 1) {
+               /* inside a recursive main loop,
+                  give up because we may not be able to 
+                  take a lock.
+               */
+               return 1;
+       }
+
         if (!Config->get_periodic_safety_backups())
                 return 1;
         
@@ -591,10 +616,7 @@ Please consider the possibilities, and perhaps (re)start JACK."));
        
        win.show_all ();
        win.set_position (Gtk::WIN_POS_CENTER);
-
-       if (!ARDOUR_COMMAND_LINE::no_splash) {
-               hide_splash ();
-       }
+       pop_back_splash ();
 
        /* we just don't care about the result, but we want to block */
 
@@ -605,64 +627,21 @@ void
 ARDOUR_UI::startup ()
 {
        string name, path;
-       bool isnew;
 
        new_session_dialog = new NewSessionDialog();
-       
-       /* If no session name is given: we're not loading a session yet, nor creating a new one */
-       
-       if (ARDOUR_COMMAND_LINE::session_name.length()) {
-       
-               /* Load session or start the new session dialog */
-               
-               if (Session::find_session (ARDOUR_COMMAND_LINE::session_name, path, name, isnew)) {
-                       
-                       MessageDialog msg (string_compose(_("Could not find command line session \"%1\""), 
-                                                         ARDOUR_COMMAND_LINE::session_name),
-                                          true,
-                                          Gtk::MESSAGE_ERROR,
-                                          Gtk::BUTTONS_OK);
-                       
-                       msg.set_position (Gtk::WIN_POS_MOUSE);
-                       msg.present ();
-                       msg.run ();
-                       
-                       exit (1);
-               }
 
-               if (!ARDOUR_COMMAND_LINE::new_session) {
-                       
-                       /* Supposed to be loading an existing session, but the session doesn't exist */
-                       
-                       if (isnew) {
-                               MessageDialog msg (string_compose (_("\n\nNo session named \"%1\" exists.\n"
-                                                                    "To create it from the command line, start ardour as:\n   ardour --new %1"), path),
-                                                  true,
-                                                  Gtk::MESSAGE_ERROR,
-                                                  Gtk::BUTTONS_OK);
-
-                               msg.set_position (Gtk::WIN_POS_MOUSE);
-                               msg.present ();
-                               msg.run ();
-
-                               exit (1);
-                       }
-               }
-       }
-
-       hide_splash ();
-
-       bool have_backend = EngineControl::engine_running();
+       bool backend_audio_is_running = EngineControl::engine_running();
        XMLNode* audio_setup = Config->extra_xml ("AudioSetup");
        
        if (audio_setup) {
                new_session_dialog->engine_control.set_state (*audio_setup);
        }
        
-       if (!get_session_parameters (ARDOUR_COMMAND_LINE::session_name, have_backend, ARDOUR_COMMAND_LINE::new_session)) {
+       if (!get_session_parameters (backend_audio_is_running, ARDOUR_COMMAND_LINE::new_session)) {
                return;
        }
        
+       BootMessage (_("Ardour is ready for use"));
        show ();
 }
 
@@ -719,6 +698,8 @@ ARDOUR_UI::check_memory_locking ()
                                hbox.pack_start (cb, true, false);
                                vbox->pack_start (hbox);
                                hbox.show_all ();
+
+                               pop_back_splash ();
                                
                                msg.run ();
                        }
@@ -752,6 +733,7 @@ ARDOUR_UI::finish()
 Ardour was unable to save your session.\n\n\
 If you still wish to quit, please use the\n\n\
 \"Just quit\" option."));
+                                       pop_back_splash();
                                        msg.run ();
                                        return;
                                }
@@ -819,8 +801,6 @@ ARDOUR_UI::ask_about_saving_session (const string & what)
        window.set_resizable (false);
        window.show_all ();
 
-       save_the_session = 0;
-
        window.set_keep_above (true);
        window.present ();
 
@@ -1024,6 +1004,13 @@ ARDOUR_UI::redisplay_recent_sessions ()
                        fullpath = fullpath.substr (0, fullpath.length()-1);
                }
 
+               /* check whether session still exists */
+               if (!Glib::file_test(fullpath.c_str(), Glib::FILE_TEST_EXISTS)) {
+                       /* session doesn't exist */
+                       cerr << "skipping non-existent session " << fullpath << endl;
+                       continue;
+               }               
+               
                /* now get available states for this session */
 
                if ((states = Session::possible_states (fullpath)) == 0) {
@@ -1144,33 +1131,6 @@ ARDOUR_UI::open_recent_session ()
        }
 }
 
-bool
-ARDOUR_UI::filter_ardour_session_dirs (const FileFilter::Info& info) 
-{
-       struct stat statbuf;
-
-       if (stat (info.filename.c_str(), &statbuf) != 0) {
-               return false;
-       }
-
-       if (!S_ISDIR(statbuf.st_mode)) {
-               return false;
-       }
-
-        // XXX Portability
-        
-       string session_file = info.filename;
-       session_file += '/';
-       session_file += Glib::path_get_basename (info.filename);
-       session_file += ".ardour";
-       
-       if (stat (session_file.c_str(), &statbuf) != 0) {
-               return false;
-       }
-
-       return S_ISREG (statbuf.st_mode);
-}
-
 bool
 ARDOUR_UI::check_audioengine ()
 {
@@ -1178,6 +1138,7 @@ ARDOUR_UI::check_audioengine ()
                if (!engine->connected()) {
                        MessageDialog msg (_("Ardour is not connected to JACK\n"
                                             "You cannot open or close sessions in this condition"));
+                       pop_back_splash ();
                        msg.run ();
                        return false;
                }
@@ -1299,6 +1260,7 @@ ARDOUR_UI::session_add_audio_route (bool track, int32_t input_channels, int32_t
 to create a new track or bus.\n\
 You should save Ardour, exit and\n\
 restart JACK with more ports."));
+               pop_back_splash ();
                msg.run ();
        }
 }
@@ -1323,7 +1285,7 @@ ARDOUR_UI::do_transport_locate (nframes_t new_position)
 }
 
 void
-ARDOUR_UI::transport_goto_start ()
+ARDOUR_UI::transport_goto_start ()  
 {
        if (session) {
                session->goto_start();
@@ -1356,6 +1318,34 @@ ARDOUR_UI::transport_goto_zero ()
        }
 }
 
+void
+ARDOUR_UI::transport_goto_wallclock ()
+{
+       if (session && editor) {
+
+               time_t now;
+               struct tm tmnow;
+               nframes64_t frames;
+               
+               time (&now);
+               localtime_r (&now, &tmnow);
+       
+               frames = tmnow.tm_hour * (60 * 60 * session->frame_rate());
+               frames += tmnow.tm_min * (60 * session->frame_rate());
+               frames += tmnow.tm_sec * session->frame_rate();
+
+               session->request_locate (frames);
+
+               /* force displayed area in editor to start no matter
+                  what "follow playhead" setting is.
+               */
+               
+               if (editor) {
+                       editor->reset_x_origin (frames - (editor->current_page_frames()/2));
+               }
+       }
+}
+
 void
 ARDOUR_UI::transport_goto_end ()
 {
@@ -1411,6 +1401,7 @@ ARDOUR_UI::remove_last_capture()
 void
 ARDOUR_UI::transport_record (bool roll)
 {
+       
        if (session) {
                switch (session->record_status()) {
                case Session::Disabled:
@@ -1436,6 +1427,7 @@ ARDOUR_UI::transport_record (bool roll)
                        session->disable_record (false, true);
                }
        }
+       //cerr << "ARDOUR_UI::transport_record () called roll = " << roll << " session->record_status() = " << session->record_status() << endl;
 }
 
 void
@@ -1449,6 +1441,8 @@ ARDOUR_UI::transport_roll ()
 
        rolling = session->transport_rolling ();
 
+       //cerr << "ARDOUR_UI::transport_roll () called session->record_status() = " << session->record_status() << endl;
+
        if (session->get_play_loop()) {
                session->request_play_loop (false);
                auto_loop_button.set_visual_state (1);
@@ -1616,7 +1610,7 @@ ARDOUR_UI::engine_running ()
        ActionManager::set_sensitive (ActionManager::jack_opposite_sensitive_actions, false);
 
        Glib::RefPtr<Action> action;
-       char* action_name = 0;
+       const char* action_name = 0;
 
        switch (engine->frames_per_cycle()) {
        case 32:
@@ -1675,6 +1669,7 @@ JACK has either been shutdown or it\n\
 disconnected Ardour because Ardour\n\
 was not fast enough. You can save the\n\
 session and/or try to reconnect to JACK ."));
+       pop_back_splash ();
        msg.run ();
 }
 
@@ -1872,17 +1867,6 @@ ARDOUR_UI::save_state_canfail (string name)
        return 0;
 }
 
-void
-ARDOUR_UI::restore_state (string name)
-{
-       if (session) {
-               if (name.length() == 0) {
-                       name = session->name();
-               }
-               session->restore_state (name);
-       }
-}
-
 void
 ARDOUR_UI::primary_clock_value_changed ()
 {
@@ -1907,37 +1891,6 @@ ARDOUR_UI::secondary_clock_value_changed ()
        }
 }
 
-void
-ARDOUR_UI::rec_enable_button_blink (bool onoff, AudioDiskstream *dstream, Widget *w)
-{
-       if (session && dstream && dstream->record_enabled()) {
-
-               Session::RecordState rs;
-               
-               rs = session->record_status ();
-
-               switch (rs) {
-               case Session::Disabled:
-               case Session::Enabled:
-                       if (w->get_state() != STATE_SELECTED) {
-                               w->set_state (STATE_SELECTED);
-                       }
-                       break;
-
-               case Session::Recording:
-                       if (w->get_state() != STATE_ACTIVE) {
-                               w->set_state (STATE_ACTIVE);
-                       }
-                       break;
-               }
-
-       } else {
-               if (w->get_state() != STATE_NORMAL) {
-                       w->set_state (STATE_NORMAL);
-               }
-       }
-}
-
 void
 ARDOUR_UI::transport_rec_enable_blink (bool onoff) 
 {
@@ -2022,6 +1975,7 @@ ARDOUR_UI::fontconfig_dialog ()
                                   true,
                                   Gtk::MESSAGE_INFO,
                                   Gtk::BUTTONS_OK);
+               pop_back_splash ();
                msg.show_all ();
                msg.present ();
                msg.run ();
@@ -2029,400 +1983,402 @@ ARDOUR_UI::fontconfig_dialog ()
 #endif
 }
 
-bool
-ARDOUR_UI::get_session_parameters (Glib::ustring predetermined_path, bool have_engine, bool should_be_new)
+void
+ARDOUR_UI::parse_cmdline_path (const Glib::ustring& cmdline_path, Glib::ustring& session_name, Glib::ustring& session_path, bool& existing_session)
 {
-       bool existing_session = false;
-       Glib::ustring session_name;
-       Glib::ustring session_path;
-       Glib::ustring template_name;
+       existing_session = false;
 
-       if (!loading_dialog) {
-               loading_dialog = new MessageDialog (*new_session_dialog, 
-                                                   "",
-                                                   false,
-                                                   Gtk::MESSAGE_INFO,
-                                                   Gtk::BUTTONS_NONE);
+       if (Glib::file_test (cmdline_path, Glib::FILE_TEST_IS_DIR)) {
+               session_path = cmdline_path;
+               existing_session = true;
+       } else if (Glib::file_test (cmdline_path, Glib::FILE_TEST_IS_REGULAR)) {
+               session_path = Glib::path_get_dirname (string (cmdline_path));
+               existing_session = true;
+       } else {
+               /* it doesn't exist, assume the best */
+               session_path = Glib::path_get_dirname (string (cmdline_path));
        }
+       
+       session_name = basename_nosuffix (string (cmdline_path));
+}
 
+int
+ARDOUR_UI::load_cmdline_session (const Glib::ustring& session_name, const Glib::ustring& session_path, bool& existing_session)
+{
+       /* when this is called, the backend audio system must be running */
 
-       int response = Gtk::RESPONSE_NONE;
+       /* the main idea here is to deal with the fact that a cmdline argument for the session
+          can be interpreted in different ways - it could be a directory or a file, and before
+          we load, we need to know both the session directory and the snapshot (statefile) within it
+          that we are supposed to use.
+       */
 
-       if (predetermined_path.length()) {
-               
-               /* before we start, lets see if the given path looks like
-                  an existing ardour session. if it does, skip the
-                  tabs that we don't need
-               */
+       if (session_name.length() == 0 || session_path.length() == 0) {
+               return false;
+       }
+       
+       if (Glib::file_test (session_path, Glib::FILE_TEST_IS_DIR)) {
 
-               if (Glib::file_test (predetermined_path, Glib::FILE_TEST_IS_DIR)) {
-                       session_path = predetermined_path;
+               Glib::ustring predicted_session_file;
+               
+               predicted_session_file = session_path;
+               predicted_session_file += '/';
+               predicted_session_file += session_name;
+               predicted_session_file += Session::statefile_suffix();
+               
+               if (Glib::file_test (predicted_session_file, Glib::FILE_TEST_EXISTS)) {
                        existing_session = true;
-               } else if (Glib::file_test (predetermined_path, Glib::FILE_TEST_IS_REGULAR)) {
-                       session_path = Glib::path_get_dirname (string (predetermined_path));
+               }
+               
+       } else if (Glib::file_test (session_path, Glib::FILE_TEST_EXISTS)) {
+               
+               if (session_path.find (Session::statefile_suffix()) == session_path.length() - 7) {
+                       /* existing .ardour file */
                        existing_session = true;
+               }
+
+       } else {
+               existing_session = false;
+       }
+       
+       /* lets just try to load it */
+       
+       if (create_engine ()) {
+               backend_audio_error (false, new_session_dialog);
+               return -1;
+       }
+       
+       return load_session (session_path, session_name);
+}
+
+bool
+ARDOUR_UI::ask_about_loading_existing_session (const Glib::ustring& session_path)
+{
+       Glib::ustring str = string_compose (_("This session\n%1\nalready exists. Do you want to open it?"), session_path);
+       
+       MessageDialog msg (str,
+                          false,
+                          Gtk::MESSAGE_WARNING,
+                          Gtk::BUTTONS_YES_NO,
+                          true);
+       
+       
+       msg.set_name (X_("CleanupDialog"));
+       msg.set_wmclass (X_("existing_session"), "Ardour");
+       msg.set_position (Gtk::WIN_POS_MOUSE);
+       pop_back_splash ();
+
+       switch (msg.run()) {
+       case RESPONSE_YES:
+               return true;
+               break;
+       }
+       return false;
+}
+
+int
+ARDOUR_UI::build_session_from_nsd (const Glib::ustring& session_path, const Glib::ustring& session_name)
+{
+       
+       uint32_t cchns;
+       uint32_t mchns;
+       AutoConnectOption iconnect;
+       AutoConnectOption oconnect;
+       uint32_t nphysin;
+       uint32_t nphysout;
+       
+       if (Profile->get_sae()) {
+               
+               cchns = 0;
+               mchns = 2;
+               iconnect = AutoConnectPhysical;
+               oconnect = AutoConnectMaster;
+               nphysin = 0; // use all available
+               nphysout = 0; // use all available
+               
+       } else {
+               
+               /* get settings from advanced section of NSD */
+               
+               if (new_session_dialog->create_control_bus()) {
+                       cchns = (uint32_t) new_session_dialog->control_channel_count();
+               } else {
+                       cchns = 0;
+               }
+               
+               if (new_session_dialog->create_master_bus()) {
+                       mchns = (uint32_t) new_session_dialog->master_channel_count();
                } else {
-                       /* it doesn't exist, assume the best */
-                       session_path = Glib::path_get_dirname (string (predetermined_path));
+                       mchns = 0;
                }
-                      
-               session_name = basename_nosuffix (string (predetermined_path));
+               
+               if (new_session_dialog->connect_inputs()) {
+                       iconnect = AutoConnectPhysical;
+               } else {
+                       iconnect = AutoConnectOption (0);
+               }
+               
+               /// @todo some minor tweaks.
+               
+               if (new_session_dialog->connect_outs_to_master()) {
+                       oconnect = AutoConnectMaster;
+               } else if (new_session_dialog->connect_outs_to_physical()) {
+                       oconnect = AutoConnectPhysical;
+               } else {
+                       oconnect = AutoConnectOption (0);
+               } 
+               
+               nphysin = (uint32_t) new_session_dialog->input_limit_count();
+               nphysout = (uint32_t) new_session_dialog->output_limit_count();
+       }
+       
+       if (build_session (session_path,
+                          session_name,
+                          cchns,
+                          mchns,
+                          iconnect,
+                          oconnect,
+                          nphysin,
+                          nphysout, 
+                          engine->frame_rate() * 60 * 5)) {
+               
+               return -1;
+       }
 
-               new_session_dialog->set_session_name (session_name);
-               new_session_dialog->set_session_folder (session_path);
-               new_session_dialog->set_modal (true);
+       return 0;
+}
 
-               if (existing_session) {
+void
+ARDOUR_UI::end_loading_messages ()
+{
+       // hide_splash ();
+}
 
-                       if (session_name.length() == 0 || session_path.length() == 0) {
-                               error << string_compose (_("Ardour cannot understand \"%1\" as a session name"), predetermined_path) << endmsg;
-                               return false;
-                       }
-                       
-                       if (Glib::file_test (predetermined_path, Glib::FILE_TEST_IS_DIR)) {
-                               Glib::ustring predicted_session_file;
-                               
-                               predicted_session_file = predetermined_path;
-                               predicted_session_file += '/';
-                               predicted_session_file += session_name;
-                               predicted_session_file += Session::statefile_suffix();
-                               
-                               if (Glib::file_test (predicted_session_file, Glib::FILE_TEST_EXISTS)) {
-                                       existing_session = true;
-                               }
-                               
-                       } else if (Glib::file_test (predetermined_path, Glib::FILE_TEST_EXISTS)) {
-                               
-                               if (predetermined_path.find (Session::statefile_suffix()) == predetermined_path.length() - 7) {
-                                       /* existing .ardour file */
-                                       existing_session = true;
-                               }
-                       } else {
-                               existing_session = false;
-                       }
-                       
-                       if (existing_session && have_engine) {
-                               /* lets just try to load it */
-                               
-                               loading_dialog->set_message (_("Starting audio engine"));
-                               loading_dialog->show_all ();
-                               flush_pending ();
-                               
-                               if (create_engine ()) {
-                                       backend_audio_error (!have_engine, new_session_dialog);
-                                       loading_dialog->hide ();
-                                       return false;
-                               }
-                               
-                               if (load_session (session_path, session_name) == 0) {
-                                       goto done;
-                               }
+void
+ARDOUR_UI::loading_message (const std::string& msg)
+{
+       show_splash ();
+       splash->message (msg);
+       flush_pending ();
+}
+       
+void
+ARDOUR_UI::idle_load (const Glib::ustring& path)
+{
+       if (session) {
+               if (Glib::file_test (path, Glib::FILE_TEST_IS_DIR)) {
+                       /* /path/to/foo => /path/to/foo, foo */
+                       load_session (path, basename_nosuffix (path));
+               } else {
+                       /* /path/to/foo/foo.ardour => /path/to/foo, foo */
+                       load_session (Glib::path_get_dirname (path), basename_nosuffix (path));
+               }
+       } else {
+               ARDOUR_COMMAND_LINE::session_name = path;
+               if (new_session_dialog) {
+                       /* make it break out of Dialog::run() and
+                          start again.
+                        */
+                       new_session_dialog->response (1);
+               }
+       }
+}
+
+bool
+ARDOUR_UI::get_session_parameters (bool backend_audio_is_running, bool should_be_new)
+{
+       bool existing_session = false;
+       Glib::ustring session_name;
+       Glib::ustring session_path;
+       Glib::ustring template_name;
+       int response;
+
+  begin:
+       response = Gtk::RESPONSE_NONE;
+
+       if (!ARDOUR_COMMAND_LINE::session_name.empty()) {
+
+               parse_cmdline_path (ARDOUR_COMMAND_LINE::session_name, session_name, session_path, existing_session);
+
+               /* don't ever reuse this */
+
+               ARDOUR_COMMAND_LINE::session_name = string();
+
+               if (existing_session && backend_audio_is_running) {
+
+                       /* just load the thing already */
+
+                       if (load_cmdline_session (session_name, session_path, existing_session) == 0) {
+                               return true;
                        }
                }
+
+               /* make the NSD use whatever information we have */
+
+               new_session_dialog->set_session_name (session_name);
+               new_session_dialog->set_session_folder (session_path);
        }
 
        /* loading failed, or we need the NSD for something */
 
+       new_session_dialog->set_modal (false);
        new_session_dialog->set_position (WIN_POS_CENTER);
        new_session_dialog->set_current_page (0);
        new_session_dialog->set_existing_session (existing_session);
        new_session_dialog->reset_recent();
 
        do {
-               new_session_dialog->set_have_engine (have_engine);
+               new_session_dialog->set_have_engine (backend_audio_is_running);
                new_session_dialog->present ();
                response = new_session_dialog->run ();
-               loading_dialog->hide ();
                
                _session_is_new = false;
                
                /* handle possible negative responses */
 
-               if (response == Gtk::RESPONSE_CANCEL || response == Gtk::RESPONSE_DELETE_EVENT) {
-                       
+               switch (response) {
+               case 1:
+                       /* sent by idle_load, meaning restart the whole process again */
+                       new_session_dialog->hide();
+                       new_session_dialog->reset();
+                       goto begin;
+                       break;
+
+               case Gtk::RESPONSE_CANCEL:
+               case Gtk::RESPONSE_DELETE_EVENT:
                        if (!session) {
                                quit();
                        }
                        new_session_dialog->hide ();
                        return false;
                        
-               } else if (response == Gtk::RESPONSE_NONE) {
+               case Gtk::RESPONSE_NONE:
                        /* "Clear" was pressed */
-                       
                        goto try_again;
                }
 
                fontconfig_dialog();
 
-               /* if we're here to help set up audio parameters this is where want to do that.
-               */
-
-               if (!have_engine) {
-                       if (new_session_dialog->engine_control.setup_engine ()) {
-                               new_session_dialog->hide ();
+               if (!backend_audio_is_running) {
+                       int ret = new_session_dialog->engine_control.setup_engine ();
+                       if (ret < 0) {
                                return false;
-                       } 
-
-                       loading_dialog->set_message (_("Starting audio engine"));
-                       loading_dialog->show_all ();
-                       flush_pending ();
+                       } else if (ret > 0) {
+                               response = Gtk::RESPONSE_REJECT;
+                               goto try_again;
+                       }
                }
-
+               
                if (create_engine ()) {
-                       backend_audio_error (!have_engine, new_session_dialog);
-                       loading_dialog->hide ();
+
+                       backend_audio_error (!backend_audio_is_running, new_session_dialog);
                        flush_pending ();
-                       /* audio setup page */
+
                        new_session_dialog->set_existing_session (false);
                        new_session_dialog->set_current_page (2);
+
                        response = Gtk::RESPONSE_NONE;
                        goto try_again;
                }
 
-               loading_dialog->hide ();
-               have_engine = true;             
+               backend_audio_is_running = true;                
                        
-               /* now handle possible affirmative responses */
-
-               if (response == Gtk::RESPONSE_YES) {
+               if (response == Gtk::RESPONSE_OK) {
 
-                       /* YES == OPEN from the session selector */
+                       session_name = new_session_dialog->session_name();
 
-                       session_name = new_session_dialog->session_name();
-                       
                        if (session_name.empty()) {
                                response = Gtk::RESPONSE_NONE;
                                goto try_again;
                        } 
 
+                       /* if the user mistakenly typed path information into the session filename entry,
+                          convert what they typed into a path & a name
+                       */
+                       
                        if (session_name[0] == '/' || 
                            (session_name.length() > 2 && session_name[0] == '.' && session_name[1] == '/') ||
                            (session_name.length() > 3 && session_name[0] == '.' && session_name[1] == '.' && session_name[2] == '/')) {
-                               if (load_session (Glib::path_get_dirname (session_name), session_name)) {
-                                       response = Gtk::RESPONSE_NONE;
-                                       goto try_again;
-                               }
+                               
+                               session_path = Glib::path_get_dirname (session_name);
+                               session_name = Glib::path_get_basename (session_name);
+                               
                        } else {
+
                                session_path = new_session_dialog->session_folder();
-                               if (load_session (session_path, session_name)) {
-                                       response = Gtk::RESPONSE_NONE;
-                                       goto try_again;
-                               }
                        }
-                       
-               } else if (response == Gtk::RESPONSE_OK) {
-
-                       /* OK == OPEN button */
-
-                       session_name = new_session_dialog->session_name();
-               
-                       if (session_name.empty()) {
-                               response = Gtk::RESPONSE_NONE;
-                               goto try_again;
-                       } 
 
+                       template_name = Glib::ustring();                        
                        switch (new_session_dialog->which_page()) {
+
                        case NewSessionDialog::OpenPage: 
                        case NewSessionDialog::EnginePage:
-
-                               if (session_name[0] == '/' || 
-                                   (session_name.length() > 2 && session_name[0] == '.' && session_name[1] == '/') ||
-                                   (session_name.length() > 3 && session_name[0] == '.' && session_name[1] == '.' && session_name[2] == '/')) {
-
-                                       if (load_session (Glib::path_get_dirname (session_name), session_name)) {
-                                               response = Gtk::RESPONSE_NONE;
-                                               goto try_again;
-                                       }
-
-                               } else {
-                                       session_path = new_session_dialog->session_folder();
-                                       if (load_session (session_path, session_name)) {
-                                               response = Gtk::RESPONSE_NONE;
-                                               goto try_again;
-                                       }
-                               }
+                               goto loadit;
                                break;
 
                        case NewSessionDialog::NewPage: /* nominally the "new" session creator, but could be in use for an old session */
-
-                               if (new_session_dialog->get_current_page() == 0 && ARDOUR_COMMAND_LINE::session_name.empty()) {
-                                       should_be_new = true;
-                               }
-
-                               /* handle what appear to be paths rather than just a name */
-
-                               if (session_name[0] == '/' || 
-                                   (session_name.length() > 2 && session_name[0] == '.' && session_name[1] == '/') ||
-                                   (session_name.length() > 3 && session_name[0] == '.' && session_name[1] == '.' && session_name[2] == '/')) {
-
-                                       session_path = Glib::path_get_dirname (session_name);
-                                       session_name = Glib::path_get_basename (session_name);
-
-                               } else {
-
-                                       session_path = new_session_dialog->session_folder();
-
-                               }
-
+                               
+                               should_be_new = true;
+                               
                                //XXX This is needed because session constructor wants a 
                                //non-existant path. hopefully this will be fixed at some point.
                                
                                session_path = Glib::build_filename (session_path, session_name);
 
-                               if (!should_be_new) {
+                               if (Glib::file_test (session_path, Glib::FileTest (G_FILE_TEST_EXISTS | G_FILE_TEST_IS_DIR))) {
 
-                                       if (load_session (session_path, session_name)) {
-                                               response = Gtk::RESPONSE_NONE;
-                                               goto try_again;
-                                       }
-
-                                       continue; /* leaves while() loop because response != NONE */
-
-                               } else if (Glib::file_test (session_path, Glib::FileTest (G_FILE_TEST_EXISTS | G_FILE_TEST_IS_DIR))) {
-
-                                       Glib::ustring str = string_compose (_("This session\n%1\nalready exists. Do you want to open it?"), session_path);
-
-                                       MessageDialog msg (str,
-                                                          false,
-                                                          Gtk::MESSAGE_WARNING,
-                                                          Gtk::BUTTONS_YES_NO,
-                                                          true);
-
-
-                                       msg.set_name (X_("CleanupDialog"));
-                                       msg.set_wmclass (X_("existing_session"), "Ardour");
-                                       msg.set_position (Gtk::WIN_POS_MOUSE);
-                                       
-                                       switch (msg.run()) {
-                                       case RESPONSE_YES:
-                                               new_session_dialog->hide ();
-                                               goto_editor_window ();
-                                               flush_pending ();
-                                               if (load_session (session_path, session_name)) {
-                                                       response = Gtk::RESPONSE_NONE;
-                                                       goto try_again;
-                                               }
-                                               goto done;
-                                               break;
-                                       default:
+                                       if (ask_about_loading_existing_session (session_path)) {
+                                               goto loadit;
+                                       } else {
                                                response = RESPONSE_NONE;
-                                               new_session_dialog->reset ();
-                                               new_session_dialog->set_existing_session (false);
-                                               loading_dialog->hide ();
-                                               continue;
-                                       }
-                               } 
+                                               goto try_again;
+                                       } 
+                               }
 
                                _session_is_new = true;
                                                
                                if (new_session_dialog->use_session_template()) {
 
                                        template_name = new_session_dialog->session_template_name();
-
-                                       new_session_dialog->hide ();
-                                       goto_editor_window ();
-                                       flush_pending ();
-
-                                       if (load_session (session_path, session_name, template_name)) {
-                                               response = Gtk::RESPONSE_NONE;
-                                               goto try_again;
-                                       }
-
+                                       goto loadit;
                          
                                } else {
-
-                                       uint32_t cchns;
-                                       uint32_t mchns;
-                                       AutoConnectOption iconnect;
-                                       AutoConnectOption oconnect;
-                                       uint32_t nphysin;
-                                       uint32_t nphysout;
-                                       
-                                       if (Profile->get_sae()) {
-
-                                               cchns = 0;
-                                               mchns = 2;
-                                               iconnect = AutoConnectPhysical;
-                                               oconnect = AutoConnectMaster;
-                                               nphysin = 0; // use all available
-                                               nphysout = 0; // use all available
-
-                                       } else {
-
-                                               /* get settings from advanced section of NSD */
-                                               
-                                               if (new_session_dialog->create_control_bus()) {
-                                                       cchns = (uint32_t) new_session_dialog->control_channel_count();
-                                               } else {
-                                                       cchns = 0;
-                                               }
-                                               
-                                               if (new_session_dialog->create_master_bus()) {
-                                                       mchns = (uint32_t) new_session_dialog->master_channel_count();
-                                               } else {
-                                                       mchns = 0;
-                                               }
-                                               
-                                               if (new_session_dialog->connect_inputs()) {
-                                                       iconnect = AutoConnectPhysical;
-                                               } else {
-                                                       iconnect = AutoConnectOption (0);
-                                               }
-                                               
-                                               /// @todo some minor tweaks.
-                                               
-                                               if (new_session_dialog->connect_outs_to_master()) {
-                                                       oconnect = AutoConnectMaster;
-                                               } else if (new_session_dialog->connect_outs_to_physical()) {
-                                                       oconnect = AutoConnectPhysical;
-                                               } else {
-                                                       oconnect = AutoConnectOption (0);
-                                               } 
-                                               
-                                               nphysin = (uint32_t) new_session_dialog->input_limit_count();
-                                               nphysout = (uint32_t) new_session_dialog->output_limit_count();
-                                       }
-
-                                       if (build_session (session_path,
-                                                          session_name,
-                                                          cchns,
-                                                          mchns,
-                                                          iconnect,
-                                                          oconnect,
-                                                          nphysin,
-                                                          nphysout, 
-                                                          engine->frame_rate() * 60 * 5)) {
-                                               
-                                               response = Gtk::RESPONSE_NONE;
+                                       if (build_session_from_nsd (session_path, session_name)) {
+                                               response = RESPONSE_NONE;
                                                goto try_again;
                                        }
-
-                                       new_session_dialog->hide ();
-                                       goto_editor_window ();
-                                       flush_pending ();
+                                       goto done;
                                }
                                break;
-
+                               
                        default:
                                break;
                        }
-               }
+                       
+                 loadit:
+                       new_session_dialog->hide ();
+                       
+                       if (load_session (session_path, session_name, template_name)) {
+                               /* force a retry */
+                               response = Gtk::RESPONSE_NONE;
+                       }
 
-         try_again:
-               if (response == Gtk::RESPONSE_NONE) {
-                       loading_dialog->hide ();
-                       new_session_dialog->set_existing_session (false);
-                       new_session_dialog->reset ();
+                 try_again:
+                       if (response == Gtk::RESPONSE_NONE) {
+                               new_session_dialog->set_existing_session (false);
+                               new_session_dialog->reset ();
+                       }
                }
-               
-       } while (response == Gtk::RESPONSE_NONE);
+
+       } while (response == Gtk::RESPONSE_NONE || response == Gtk::RESPONSE_REJECT);
 
   done:
        show();
-       loading_dialog->hide ();
        new_session_dialog->hide();
+       new_session_dialog->reset();
+       goto_editor_window ();
        return true;
-}
+}      
 
 void
 ARDOUR_UI::close_session ()
@@ -2433,7 +2389,7 @@ ARDOUR_UI::close_session ()
 
        unload_session (true);
        
-       get_session_parameters ("", true, false);
+       get_session_parameters (true, false);
 }
 
 int
@@ -2463,16 +2419,12 @@ ARDOUR_UI::load_session (const Glib::ustring& path, const Glib::ustring& snap_na
        if (Glib::file_test (path.c_str(), Glib::FILE_TEST_EXISTS) && ::access (path.c_str(), W_OK)) {
                MessageDialog msg (*editor, _("You do not have write access to this session.\n"
                                              "This prevents the session from being loaded."));
+               pop_back_splash ();
                msg.run ();
                goto out;
        }
 
-       if (loading_dialog) {
-               loading_dialog->set_markup (_("Please wait while Ardour loads your session"));
-               flush_pending ();
-       }
-
-       disable_screen_updates ();
+       loading_message (_("Please wait while Ardour loads your session"));
 
        try {
                new_session = new Session (*engine, path, snap_name, mix_template);
@@ -2490,6 +2442,7 @@ ARDOUR_UI::load_session (const Glib::ustring& path, const Glib::ustring& snap_na
                msg.set_title (_("Loading Error"));
                msg.set_secondary_text (_("Click the OK button to try again."));
                msg.set_position (Gtk::WIN_POS_CENTER);
+               pop_back_splash ();
                msg.present ();
 
                int response = msg.run ();
@@ -2515,6 +2468,7 @@ ARDOUR_UI::load_session (const Glib::ustring& path, const Glib::ustring& snap_na
                msg.set_title (_("Loading Error"));
                msg.set_secondary_text (_("Click the OK button to try again."));
                msg.set_position (Gtk::WIN_POS_CENTER);
+               pop_back_splash ();
                msg.present ();
 
                int response = msg.run ();
@@ -2542,7 +2496,6 @@ ARDOUR_UI::load_session (const Glib::ustring& path, const Glib::ustring& snap_na
                session->set_clean ();
        }
 
-       enable_screen_updates ();
        flush_pending ();
        retval = 0;
 
@@ -2587,6 +2540,7 @@ ARDOUR_UI::build_session (const Glib::ustring& path, const Glib::ustring& snap_n
        catch (...) {
 
                MessageDialog msg (string_compose(_("Could not create session in \"%1\""), path));
+               pop_back_splash ();
                msg.run ();
                return -1;
        }
@@ -2612,28 +2566,54 @@ ARDOUR_UI::show ()
 }
 
 void
-ARDOUR_UI::show_splash ()
+ARDOUR_UI::show_about ()
 {
        if (about == 0) {
-               about = new About();
+               about = new About;
                about->signal_response().connect(mem_fun (*this, &ARDOUR_UI::about_signal_response) );
        }
-       about->present();
-       flush_pending ();
+
+       about->show_all ();
+}
+
+void
+ARDOUR_UI::hide_about ()
+{
+       if (about) {
+               about->get_window()->set_cursor ();
+               about->hide ();
+       }
 }
 
 void
 ARDOUR_UI::about_signal_response(int response)
 {
-       hide_splash();
+       hide_about();
+}
+
+void
+ARDOUR_UI::show_splash ()
+{
+       if (splash == 0) {
+               try {
+                       splash = new Splash;
+               } catch (...) {
+                       return;
+               }
+       }
+
+       splash->show ();
+       splash->present ();
+       splash->queue_draw ();
+       splash->get_window()->process_updates (true);
+       flush_pending ();
 }
 
 void
 ARDOUR_UI::hide_splash ()
 {
-       if (about) {
-               about->get_window()->set_cursor ();
-               about->hide();
+       if (splash) {
+               splash->hide();
        }
 }
 
@@ -2781,8 +2761,11 @@ After cleanup, unused audio files will be moved to a \
        }
 
        if (session->cleanup_sources (rep)) {
+               editor->finish_cleanup ();
                return;
        }
+       
+       editor->finish_cleanup ();
 
        checker.hide();
        display_cleanup_results (rep, 
@@ -2796,8 +2779,6 @@ release an additional\n\
 %4 %5bytes of disk space.\n"
                                         ));
 
-
-
 }
 
 void
@@ -2873,6 +2854,8 @@ ARDOUR_UI::add_route (Gtk::Window* float_window)
 
        /* XXX do something with name template */
 
+       cerr << "Adding with " << input_chan << " in and " << output_chan << "out\n";
+
        if (track) {
                session_add_audio_track (input_chan, output_chan, add_route_dialog->mode(), count);
        } else {
@@ -2929,15 +2912,33 @@ ARDOUR_UI::keyboard_settings () const
 }
 
 void
-ARDOUR_UI::halt_on_xrun_message ()
+ARDOUR_UI::create_xrun_marker(nframes_t where)
 {
-       ENSURE_GUI_THREAD (mem_fun(*this, &ARDOUR_UI::halt_on_xrun_message));
+       editor->mouse_add_new_marker (where, false, true);
+}
 
+void
+ARDOUR_UI::halt_on_xrun_message ()
+{
        MessageDialog msg (*editor,
                           _("Recording was stopped because your system could not keep up."));
        msg.run ();
 }
 
+void
+ARDOUR_UI::xrun_handler(nframes_t where)
+{
+       ENSURE_GUI_THREAD (bind(mem_fun(*this, &ARDOUR_UI::xrun_handler), where));
+
+       if (Config->get_create_xrun_marker() && session->actively_recording()) {
+               create_xrun_marker(where);
+       }
+
+       if (Config->get_stop_recording_on_xrun() && session->actively_recording()) {
+               halt_on_xrun_message ();
+       }
+}
+
 void
 ARDOUR_UI::disk_overrun_handler ()
 {
@@ -2981,6 +2982,24 @@ ARDOUR_UI::disk_speed_dialog_gone (int ignored_response, MessageDialog* msg)
        delete msg;
 }
 
+void
+ARDOUR_UI::session_dialog (std::string msg)
+{
+       ENSURE_GUI_THREAD (bind (mem_fun(*this, &ARDOUR_UI::session_dialog), msg));
+       
+       MessageDialog* d;
+
+       if (editor) {
+               d = new MessageDialog (*editor, msg, false, MESSAGE_INFO, BUTTONS_OK, true);
+       } else {
+               d = new MessageDialog (msg, false, MESSAGE_INFO, BUTTONS_OK, true);
+       }
+
+       d->show_all ();
+       d->run ();
+       delete d;
+}      
+
 int
 ARDOUR_UI::pending_state_dialog ()
 {
@@ -3014,6 +3033,38 @@ what you would like to do.\n"));
                return 0;
        }
 }
+
+int
+ARDOUR_UI::sr_mismatch_dialog (nframes_t desired, nframes_t actual)
+{
+       HBox* hbox = new HBox();
+       Image* image = new Image (Stock::DIALOG_QUESTION, ICON_SIZE_DIALOG);
+       ArdourDialog dialog (_("Sample Rate Mismatch"), true);
+       Label  message (string_compose (_("\
+This session was created with a sample rate of %1 Hz\n\
+\n\
+The audioengine is currently running at %2 Hz\n"), desired, actual));
+
+       image->set_alignment(ALIGN_CENTER, ALIGN_TOP);
+       hbox->pack_start (*image, PACK_EXPAND_WIDGET, 12);
+       hbox->pack_end (message, PACK_EXPAND_PADDING, 12);
+       dialog.get_vbox()->pack_start(*hbox, PACK_EXPAND_PADDING, 6);
+       dialog.add_button (_("Do not load session"), RESPONSE_REJECT);
+       dialog.add_button (_("Load session anyway"), RESPONSE_ACCEPT);
+       dialog.set_default_response (RESPONSE_ACCEPT);
+       dialog.set_position (WIN_POS_CENTER);
+       message.show();
+       image->show();
+       hbox->show();
+
+       switch (dialog.run ()) {
+       case RESPONSE_ACCEPT:
+               return 0;
+       default:
+               return 1;
+       }
+}
+
        
 void
 ARDOUR_UI::disconnect_from_jack ()
@@ -3041,26 +3092,6 @@ ARDOUR_UI::reconnect_to_jack ()
        }
 }
 
-int
-ARDOUR_UI::cmdline_new_session (string path)
-{
-       if (path[0] != '/') {
-               char buf[PATH_MAX+1];
-               string str;
-
-               getcwd (buf, sizeof (buf));
-               str = buf;
-               str += '/';
-               str += path;
-               path = str;
-       }
-
-       get_session_parameters (path, false, true);
-
-       _will_create_new_session_automatically = false; /* done it */
-       return FALSE; /* don't call it again */
-}
-
 void
 ARDOUR_UI::use_config ()
 {
@@ -3158,27 +3189,18 @@ ARDOUR_UI::record_state_changed ()
        }
 }
 
-void
-ARDOUR_UI::set_keybindings_path (string path)
-{
-       keybindings_path = path;
-}
-
-void
-ARDOUR_UI::save_keybindings ()
-{
-       if (can_save_keybindings) {
-               AccelMap::save (user_keybindings_path);
-       } 
-}
-
 bool
 ARDOUR_UI::first_idle ()
 {
        if (session) {
                session->allow_auto_play (true);
        }
-       can_save_keybindings = true;
+
+       if (editor) {
+               editor->first_idle();
+       }
+
+       Keyboard::set_can_save_keybindings (true);
        return false;
 }
 
@@ -3228,7 +3250,7 @@ ARDOUR_UI::TransportControllable::set_value (float val)
                return;
        }
 
-       char *action = 0;
+       const char *action = 0;
 
        switch (type) {
        case Roll: