remove reference to PluginState in VST code, for real this time
[ardour.git] / libs / ardour / session_state.cc
index 2813cc72f09d785c12d6b217d9ecb83d7a96706e..8a49636941e5c4327cff48bae548caf58019c31c 100644 (file)
 #include <ardour/audioregion.h>
 #include <ardour/crossfade.h>
 #include <ardour/control_protocol_manager.h>
+#include <ardour/region_factory.h>
+#include <ardour/source_factory.h>
+
+#include <control_protocol/control_protocol.h>
 
 #include "i18n.h"
 #include <locale.h>
@@ -97,10 +101,11 @@ Session::first_stage_init (string fullpath, string snapshot_name)
        }
 
        char buf[PATH_MAX+1];
-       if (!realpath(fullpath.c_str(), buf) && (errno != ENOENT)) {
+       if (!realpath (fullpath.c_str(), buf) && (errno != ENOENT)) {
                error << string_compose(_("Could not use path %1 (%s)"), buf, strerror(errno)) << endmsg;
                throw failed_constructor();
        }
+
        _path = string(buf);
 
        if (_path[_path.length()-1] != '/') {
@@ -112,7 +117,6 @@ Session::first_stage_init (string fullpath, string snapshot_name)
        */
 
        _name = _current_snapshot_name = snapshot_name;
-       setup_raid_path (_path);
 
        _current_frame_rate = _engine.frame_rate ();
        _tempo_map = new TempoMap (_current_frame_rate);
@@ -130,16 +134,8 @@ Session::first_stage_init (string fullpath, string snapshot_name)
        start_location = new Location (0, 0, _("start"), Location::Flags ((Location::IsMark|Location::IsStart)));
        _end_location_is_free = true;
        g_atomic_int_set (&_record_status, Disabled);
-       auto_play = false;
-       punch_in = false;
-       punch_out = false;
-       auto_loop = false;
-       seamless_loop = false;
        loop_changing = false;
-       auto_input = true;
-       crossfades_active = false;
-       all_safe = false;
-       auto_return = false;
+       play_loop = false;
        _last_roll_location = 0;
        _last_record_location = 0;
        pending_locate_frame = 0;
@@ -152,8 +148,6 @@ Session::first_stage_init (string fullpath, string snapshot_name)
        outbound_mtc_smpte_frame = 0;
        next_quarter_frame_to_send = -1;
        current_block_size = 0;
-       _solo_latched = true;
-       _solo_model = InverseMute;
        solo_update_disabled = false;
        currently_soloing = false;
        _have_captured = false;
@@ -162,12 +156,11 @@ Session::first_stage_init (string fullpath, string snapshot_name)
        _worst_track_latency = 0;
        _state_of_the_state = StateOfTheState(CannotSave|InitialConnecting|Loading);
        _slave = 0;
-       _slave_type = None;
        butler_mixdown_buffer = 0;
        butler_gain_buffer = 0;
-       mmc_control = false;
-       midi_control = true;
        mmc = 0;
+       session_send_mmc = false;
+       session_send_mtc = false;
        post_transport_work = PostTransportWork (0);
        g_atomic_int_set (&butler_should_do_transport_work, 0);
        g_atomic_int_set (&butler_active, 0);
@@ -175,79 +168,62 @@ Session::first_stage_init (string fullpath, string snapshot_name)
        g_atomic_int_set (&_capture_load, 100);
        g_atomic_int_set (&_playback_load_min, 100);
        g_atomic_int_set (&_capture_load_min, 100);
-       pending_audition_region = 0;
-       _edit_mode = Slide;
-       pending_edit_mode = _edit_mode;
        _play_range = false;
-       input_auto_connect = AutoConnectOption (0);
-       output_auto_connect = AutoConnectOption (0);
        waiting_to_start = false;
        _exporting = false;
        _gain_automation_buffer = 0;
        _pan_automation_buffer = 0;
        _npan_buffers = 0;
        pending_abort = false;
-       layer_model = MoveAddHigher;
-       xfade_model = ShortCrossfade;
        destructive_index = 0;
+       current_trans = 0;
+       first_file_data_format_reset = true;
+       first_file_header_format_reset = true;
 
-       /* allocate conversion buffers */
-       _conversion_buffers[ButlerContext] = new char[AudioDiskstream::disk_io_frames() * 4];
-       _conversion_buffers[TransportContext] = new char[AudioDiskstream::disk_io_frames() * 4];
        AudioDiskstream::allocate_working_buffers();
        
        /* default short fade = 15ms */
 
-       Crossfade::set_short_xfade_length ((jack_nframes_t) floor ((15.0 * frame_rate()) / 1000.0));
+       Crossfade::set_short_xfade_length ((nframes_t) floor (Config->get_short_xfade_seconds() * frame_rate()));
        DestructiveFileSource::setup_standard_crossfades (frame_rate());
 
        last_mmc_step.tv_sec = 0;
        last_mmc_step.tv_usec = 0;
        step_speed = 0.0;
 
-       preroll.type = AnyTime::Frames;
-       preroll.frames = 0;
-       postroll.type = AnyTime::Frames;
-       postroll.frames = 0;
-
        /* click sounds are unset by default, which causes us to internal
           waveforms for clicks.
        */
        
-       _clicking = false;
-       click_requested = false;
        click_data = 0;
        click_emphasis_data = 0;
        click_length = 0;
        click_emphasis_length = 0;
+       _clicking = false;
 
        process_function = &Session::process_with_events;
 
+       if (Config->get_use_video_sync()) {
+               waiting_for_sync_offset = true;
+       } else {
+               waiting_for_sync_offset = false;
+       }
+
+       _current_frame_rate = 48000;
+       _base_frame_rate = 48000;
+
        last_smpte_when = 0;
        _smpte_offset = 0;
        _smpte_offset_negative = true;
        last_smpte_valid = false;
 
+       sync_time_vars ();
+
        last_rr_session_dir = session_dirs.begin();
        refresh_disk_space ();
 
        // set_default_fade (0.2, 5.0); /* steepness, millisecs */
 
-       /* default configuration */
-
-       do_not_record_plugins = false;
-       over_length_short = 2;
-       over_length_long = 10;
-       send_midi_timecode = false;
-       send_midi_machine_control = false;
-       shuttle_speed_factor = 1.0;
-       shuttle_speed_threshold = 5;
-       rf_speed = 2.0;
-       _meter_hold = 100; // XXX unknown units: number of calls to meter::set()
-       _meter_falloff = 1.5f; // XXX unknown units: refresh_rate
-       max_level = 0;
-       min_level = 0;
-
        /* slave stuff */
 
        average_slave_delta = 1800;
@@ -255,23 +231,19 @@ Session::first_stage_init (string fullpath, string snapshot_name)
        delta_accumulator_cnt = 0;
        slave_state = Stopped;
 
-       /* default SMPTE type is 30 FPS, non-drop */
-
-       set_smpte_type (30.0, false);
-
        _engine.GraphReordered.connect (mem_fun (*this, &Session::graph_reordered));
 
        /* These are all static "per-class" signals */
 
-       Region::CheckNewRegion.connect (mem_fun (*this, &Session::add_region));
-       AudioSource::AudioSourceCreated.connect (mem_fun (*this, &Session::add_audio_source));
+       RegionFactory::CheckNewRegion.connect (mem_fun (*this, &Session::add_region));
+       SourceFactory::SourceCreated.connect (mem_fun (*this, &Session::add_source));
        Playlist::PlaylistCreated.connect (mem_fun (*this, &Session::add_playlist));
        Redirect::RedirectCreated.connect (mem_fun (*this, &Session::add_redirect));
-       AudioDiskstream::DiskstreamCreated.connect (mem_fun (*this, &Session::add_diskstream));
        NamedSelection::NamedSelectionCreated.connect (mem_fun (*this, &Session::add_named_selection));
+        Curve::CurveCreated.connect (mem_fun (*this, &Session::add_curve));
+        AutomationList::AutomationListCreated.connect (mem_fun (*this, &Session::add_automation_list));
 
-       Controllable::Created.connect (mem_fun (*this, &Session::add_controllable));
-       Controllable::GoingAway.connect (mem_fun (*this, &Session::remove_controllable));
+       Controllable::Destroyed.connect (mem_fun (*this, &Session::remove_controllable));
 
        IO::MoreOutputs.connect (mem_fun (*this, &Session::ensure_passthru_buffers));
 
@@ -302,10 +274,14 @@ Session::second_stage_init (bool new_session)
                return -1;
        }
 
+       // set_state() will call setup_raid_path(), but if it's a new session we need
+       // to call setup_raid_path() here.
        if (state_tree) {
                if (set_state (*state_tree->root())) {
                        return -1;
                }
+       } else {
+               setup_raid_path(_path);
        }
 
        /* we can't save till after ::when_engine_running() is called,
@@ -366,14 +342,6 @@ Session::raid_path () const
        return path.substr (0, path.length() - 1); // drop final colon
 }
 
-void
-Session::set_raid_path (string path)
-{
-       /* public-access to setup_raid_path() */
-
-       setup_raid_path (path);
-}
-
 void
 Session::setup_raid_path (string path)
 {
@@ -414,16 +382,7 @@ Session::setup_raid_path (string path)
                if (fspath[fspath.length()-1] != '/') {
                        fspath += '/';
                }
-               fspath += sound_dir_name;
-               fspath += ':';
-
-               /* tape dir */
-
-               fspath += sp.path;
-               if (fspath[fspath.length()-1] != '/') {
-                       fspath += '/';
-               }
-               fspath += tape_dir_name;
+               fspath += sound_dir (false);
                
                AudioFileSource::set_search_path (fspath);
 
@@ -444,16 +403,7 @@ Session::setup_raid_path (string path)
                if (fspath[fspath.length()-1] != '/') {
                        fspath += '/';
                }
-               fspath += sound_dir_name;
-               fspath += ':';
-
-               /* add tape dir to file search path */
-
-               fspath += sp.path;
-               if (fspath[fspath.length()-1] != '/') {
-                       fspath += '/';
-               }
-               fspath += tape_dir_name;
+               fspath += sound_dir (false);
                fspath += ':';
 
                remaining = remaining.substr (colon+1);
@@ -469,15 +419,9 @@ Session::setup_raid_path (string path)
                if (fspath[fspath.length()-1] != '/') {
                        fspath += '/';
                }
-               fspath += sound_dir_name;
+               fspath += sound_dir (false);
                fspath += ':';
 
-               fspath += sp.path;
-               if (fspath[fspath.length()-1] != '/') {
-                       fspath += '/';
-               }
-               fspath += tape_dir_name;
-
                session_dirs.push_back (sp);
        }
 
@@ -491,126 +435,94 @@ Session::setup_raid_path (string path)
 }
 
 int
-Session::create (bool& new_session, string* mix_template, jack_nframes_t initial_length)
+Session::create (bool& new_session, string* mix_template, nframes_t initial_length)
 {
        string dir;
-       
-       if (mkdir (_path.c_str(), 0755) < 0) {
-               if (errno == EEXIST) {
-                       new_session = false;
-               } else {
-                       error << string_compose(_("Session: cannot create session dir \"%1\" (%2)"), _path, strerror (errno)) << endmsg;
-                       return -1;
-               }
-       } else {
-               new_session = true;
+
+       if (g_mkdir_with_parents (_path.c_str(), 0755) < 0) {
+               error << string_compose(_("Session: cannot create session dir \"%1\" (%2)"), _path, strerror (errno)) << endmsg;
+               return -1;
        }
 
        dir = peak_dir ();
 
-       if (mkdir (dir.c_str(), 0755) < 0) {
-               if (errno != EEXIST) {
-                       error << string_compose(_("Session: cannot create session peakfile dir \"%1\" (%2)"), dir, strerror (errno)) << endmsg;
-                       return -1;
-               }
+       if (g_mkdir_with_parents (dir.c_str(), 0755) < 0) {
+               error << string_compose(_("Session: cannot create session peakfile dir \"%1\" (%2)"), dir, strerror (errno)) << endmsg;
+               return -1;
        }
 
        dir = sound_dir ();
 
-       if (mkdir (dir.c_str(), 0755) < 0) {
-               if (errno != EEXIST) {
-                       error << string_compose(_("Session: cannot create session sounds dir \"%1\" (%2)"), dir, strerror (errno)) << endmsg;
-                       return -1;
-               }
-       }
-
-       dir = tape_dir ();
-
-       if (mkdir (dir.c_str(), 0755) < 0) {
-               if (errno != EEXIST) {
-                       error << string_compose(_("Session: cannot create session tape dir \"%1\" (%2)"), dir, strerror (errno)) << endmsg;
-                       return -1;
-               }
+       if (g_mkdir_with_parents (dir.c_str(), 0755) < 0) {
+               error << string_compose(_("Session: cannot create session sounds dir \"%1\" (%2)"), dir, strerror (errno)) << endmsg;
+               return -1;
        }
 
        dir = dead_sound_dir ();
 
-       if (mkdir (dir.c_str(), 0755) < 0) {
-               if (errno != EEXIST) {
-                       error << string_compose(_("Session: cannot create session dead sounds dir \"%1\" (%2)"), dir, strerror (errno)) << endmsg;
-                       return -1;
-               }
+       if (g_mkdir_with_parents (dir.c_str(), 0755) < 0) {
+               error << string_compose(_("Session: cannot create session dead sounds dir \"%1\" (%2)"), dir, strerror (errno)) << endmsg;
+               return -1;
        }
 
        dir = automation_dir ();
 
-       if (mkdir (dir.c_str(), 0755) < 0) {
-               if (errno != EEXIST) {
-                       error << string_compose(_("Session: cannot create session automation dir \"%1\" (%2)"), dir, strerror (errno)) << endmsg;
-                       return -1;
-               }
+       if (g_mkdir_with_parents (dir.c_str(), 0755) < 0) {
+               error << string_compose(_("Session: cannot create session automation dir \"%1\" (%2)"), dir, strerror (errno)) << endmsg;
+               return -1;
        }
 
-       
+
        /* check new_session so we don't overwrite an existing one */
-       
+
        if (mix_template) {
-               if (new_session){
-                       std::string in_path = *mix_template;
+               std::string in_path = *mix_template;
+
+               ifstream in(in_path.c_str());
+
+               if (in){
+                       string out_path = _path;
+                       out_path += _name;
+                       out_path += _statefile_suffix;
+
+                       ofstream out(out_path.c_str());
+
+                       if (out){
+                               out << in.rdbuf();
+
+                               // okay, session is set up.  Treat like normal saved
+                               // session from now on.
+
+                               new_session = false;
+                               return 0;
 
-                       ifstream in(in_path.c_str());
-                       
-                       if (in){
-                               string out_path = _path;
-                               out_path += _name;
-                               out_path += _statefile_suffix;
-                               
-                               ofstream out(out_path.c_str());
-
-                               if (out){
-                                       out << in.rdbuf();
-                                       
-                                       // okay, session is set up.  Treat like normal saved
-                                       // session from now on.
-                                       
-                                       new_session = false;
-                                       return 0;
-                                       
-                               } else {
-                                       error << string_compose (_("Could not open %1 for writing mix template"), out_path) 
-                                             << endmsg;
-                                       return -1;
-                               }
-                               
                        } else {
-                               error << string_compose (_("Could not open mix template %1 for reading"), in_path) 
-                                     << endmsg;
+                               error << string_compose (_("Could not open %1 for writing mix template"), out_path) 
+                                       << endmsg;
                                return -1;
                        }
-                       
-                       
+
                } else {
-                       warning << _("Session already exists.  Not overwriting") << endmsg;
+                       error << string_compose (_("Could not open mix template %1 for reading"), in_path) 
+                               << endmsg;
                        return -1;
                }
+
        }
 
-       if (new_session) {
+       /* set initial start + end point */
 
-               /* set initial start + end point */
+       start_location->set_end (0);
+       _locations.add (start_location);
 
-               start_location->set_end (0);
-               _locations.add (start_location);
+       end_location->set_end (initial_length);
+       _locations.add (end_location);
 
-               end_location->set_end (initial_length);
-               _locations.add (end_location);
-               
-               _state_of_the_state = Clean;
+       _state_of_the_state = Clean;
 
-               if (save_state (_current_snapshot_name)) {
-                        save_history();
-                       return -1;
-               }
+       if (save_state (_current_snapshot_name)) {
+               save_history (_current_snapshot_name);
+               return -1;
        }
 
        return 0;
@@ -626,11 +538,10 @@ Session::load_diskstreams (const XMLNode& node)
 
        for (citer = clist.begin(); citer != clist.end(); ++citer) {
                
-               AudioDiskstream* dstream;
 
                try {
-                       dstream = new AudioDiskstream (*this, **citer);
-                       /* added automatically by AudioDiskstreamCreated handler */
+                       boost::shared_ptr<AudioDiskstream> dstream (new AudioDiskstream (*this, **citer));
+                       add_diskstream (dstream);
                } 
                
                catch (failed_constructor& err) {
@@ -695,6 +606,8 @@ Session::save_state (string snapshot_name, bool pending)
 
        }
 
+       cerr << "actually writing state\n";
+
        if (!tree.write (xml_path)) {
                error << string_compose (_("state could not be saved to %1"), xml_path) << endmsg;
 
@@ -716,6 +629,7 @@ Session::save_state (string snapshot_name, bool pending)
        }
 
        if (!pending) {
+                save_history(snapshot_name);
 
                bool was_dirty = dirty();
 
@@ -800,227 +714,9 @@ Session::load_options (const XMLNode& node)
 {
        XMLNode* child;
        XMLProperty* prop;
-       bool have_fade_msecs = false;
-       bool have_fade_steepness = false;
-       float fade_msecs = 0;
-       float fade_steepness = 0;
-       SlaveSource slave_src = None;
-       int x;
        LocaleGuard lg (X_("POSIX"));
-       
-       if ((child = find_named_node (node, "input-auto-connect")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       sscanf (prop->value().c_str(), "%x", &x);
-                       input_auto_connect = AutoConnectOption (x);
-               }
-       }
 
-       if ((child = find_named_node (node, "output-auto-connect")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       sscanf (prop->value().c_str(), "%x", &x);
-                       output_auto_connect = AutoConnectOption (x);
-               }
-       }
-                               
-       if ((child = find_named_node (node, "slave")) != 0) {
-               if ((prop = child->property ("type")) != 0) {
-                       if (prop->value() == "none") {
-                               slave_src = None;
-                       } else if (prop->value() == "mtc") {
-                               slave_src = MTC;
-                       } else if (prop->value() == "jack") {
-                               slave_src = JACK;
-                       }
-                       set_slave_source (slave_src, 0);
-               }
-       }
-
-       /* we cannot set edit mode if we are loading a session,
-          because it might destroy the playlist's positioning
-       */
-
-       if ((child = find_named_node (node, "edit-mode")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       if (prop->value() == "slide") {
-                               pending_edit_mode = Slide;
-                       } else if (prop->value() == "splice") {
-                               pending_edit_mode = Splice;
-                       } 
-               }
-       }
-                               
-       if ((child = find_named_node (node, "send-midi-timecode")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       bool x = (prop->value() == "yes");
-                       send_mtc = !x; /* force change in value */
-                       set_send_mtc (x);
-               }
-       }
-       if ((child = find_named_node (node, "send-midi-machine-control")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       bool x = (prop->value() == "yes");
-                       send_mmc = !x; /* force change in value */
-                       set_send_mmc (prop->value() == "yes");
-               }
-       }
-       if ((child = find_named_node (node, "max-level")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       max_level = atoi (prop->value().c_str());
-               }
-       }
-       if ((child = find_named_node (node, "min-level")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       min_level = atoi (prop->value().c_str());
-               }
-       }
-       if ((child = find_named_node (node, "meter-hold")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       _meter_hold = atof (prop->value().c_str());
-               }
-       }
-       if ((child = find_named_node (node, "meter-falloff")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       _meter_falloff = atof (prop->value().c_str());
-               }
-       }
-       if ((child = find_named_node (node, "long-over-length")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       over_length_long = atoi (prop->value().c_str());
-               }
-       }
-       if ((child = find_named_node (node, "short-over-length")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       over_length_short = atoi (prop->value().c_str());
-               }
-       }
-       if ((child = find_named_node (node, "shuttle-speed-factor")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       shuttle_speed_factor = atof (prop->value().c_str());
-               }
-       }
-       if ((child = find_named_node (node, "shuttle-speed-threshold")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       shuttle_speed_threshold = atof (prop->value().c_str());
-               }
-       }
-       if ((child = find_named_node (node, "rf-speed")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       rf_speed = atof (prop->value().c_str());
-               }
-       }
-       if ((child = find_named_node (node, "smpte-frames-per-second")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       set_smpte_type( atof (prop->value().c_str()), smpte_drop_frames );
-               }
-       }
-       if ((child = find_named_node (node, "smpte-drop-frames")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       set_smpte_type( smpte_frames_per_second, (prop->value() == "yes") );
-               }
-       }
-       if ((child = find_named_node (node, "smpte-offset")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       set_smpte_offset( atoi (prop->value().c_str()) );
-               }
-       }
-       if ((child = find_named_node (node, "smpte-offset-negative")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       set_smpte_offset_negative( (prop->value() == "yes") );
-               }
-       }
-       if ((child = find_named_node (node, "click-sound")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       click_sound = prop->value();
-               }
-       }
-       if ((child = find_named_node (node, "click-emphasis-sound")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       click_emphasis_sound = prop->value();
-               }
-       }
-
-       if ((child = find_named_node (node, "solo-model")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       if (prop->value() == "SoloBus")
-                               _solo_model = SoloBus;
-                       else
-                               _solo_model = InverseMute;
-               }
-       }
-
-       /* BOOLEAN OPTIONS */
-
-       if ((child = find_named_node (node, "auto-play")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       set_auto_play (prop->value() == "yes");
-               }
-       }
-       if ((child = find_named_node (node, "auto-input")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       set_auto_input (prop->value() == "yes");
-               }
-       }
-       if ((child = find_named_node (node, "seamless-loop")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       set_seamless_loop (prop->value() == "yes");
-               }
-       }
-       if ((child = find_named_node (node, "punch-in")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       set_punch_in (prop->value() == "yes");
-               }
-       }
-       if ((child = find_named_node (node, "punch-out")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       set_punch_out (prop->value() == "yes");
-               }
-       }
-       if ((child = find_named_node (node, "auto-return")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       set_auto_return (prop->value() == "yes");
-               }
-       }
-       if ((child = find_named_node (node, "send-mtc")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       set_send_mtc (prop->value() == "yes");
-               }
-       }
-       if ((child = find_named_node (node, "mmc-control")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       set_mmc_control (prop->value() == "yes");
-               }
-       }
-       if ((child = find_named_node (node, "midi-control")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       set_midi_control (prop->value() == "yes");
-               }
-       }
-       if ((child = find_named_node (node, "midi-feedback")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       set_midi_feedback (prop->value() == "yes");
-               }
-       }
-       // Legacy support for <recording-plugins>
-       if ((child = find_named_node (node, "recording-plugins")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       set_do_not_record_plugins (prop->value() == "no");
-               }
-       }
-       if ((child = find_named_node (node, "do-not-record-plugins")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       set_do_not_record_plugins (prop->value() == "yes");
-               }
-       }
-       if ((child = find_named_node (node, "crossfades-active")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       set_crossfades_active (prop->value() == "yes");
-               }
-       }
-       if ((child = find_named_node (node, "audible-click")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       set_clicking (prop->value() == "yes");
-               }
-       }
+       Config->set_variables (node, ConfigVariableBase::Session);
 
        if ((child = find_named_node (node, "end-marker-is-free")) != 0) {
                if ((prop = child->property ("val")) != 0) {
@@ -1028,239 +724,30 @@ Session::load_options (const XMLNode& node)
                }
        }
 
-       if ((child = find_named_node (node, "layer-model")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       if (prop->value() == X_("LaterHigher")) {
-                               set_layer_model (LaterHigher);
-                       } else if (prop->value() == X_("AddHigher")) {
-                               set_layer_model (AddHigher);
-                       } else {
-                               set_layer_model (MoveAddHigher);
-                       }
-               }
-       }
-
-       if ((child = find_named_node (node, "xfade-model")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       if (prop->value() == X_("Short")) {
-                               set_xfade_model (ShortCrossfade);
-                       } else {
-                               set_xfade_model (FullCrossfade);
-                       }
-               }
-       }
-
-       if ((child = find_named_node (node, "short-xfade-length")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       /* value is stored as a fractional seconds */
-                       float secs = atof (prop->value().c_str());
-                       Crossfade::set_short_xfade_length ((jack_nframes_t) floor (secs * frame_rate()));
-               } 
-       }
-
-       if ((child = find_named_node (node, "full-xfades-unmuted")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       crossfades_active = (prop->value() == "yes");
-               }
-       } 
-
-       /* TIED OPTIONS */
-
-       if ((child = find_named_node (node, "default-fade-steepness")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       fade_steepness = atof (prop->value().c_str());
-                       have_fade_steepness = true;
-               }
-       }
-       if ((child = find_named_node (node, "default-fade-msec")) != 0) {
-               if ((prop = child->property ("val")) != 0) {
-                       fade_msecs = atof (prop->value().c_str());
-                       have_fade_msecs = true;
-               }
-       }
+       return 0;
+}
 
-       if (have_fade_steepness || have_fade_msecs) {
-               // set_default_fade (fade_steepness, fade_msecs);
-       }
+bool
+Session::save_config_options_predicate (ConfigVariableBase::Owner owner) const
+{
+       const ConfigVariableBase::Owner modified_by_session_or_user = (ConfigVariableBase::Owner)
+               (ConfigVariableBase::Session|ConfigVariableBase::Interface);
 
-       return 0;
+       return owner & modified_by_session_or_user;
 }
 
 XMLNode&
 Session::get_options () const
 {
-       XMLNode* opthead;
        XMLNode* child;
-       char buf[32];
        LocaleGuard lg (X_("POSIX"));
 
-       opthead = new XMLNode ("Options");
-
-       SlaveSource src = slave_source ();
-       string src_string;
-       switch (src) {
-       case None:
-               src_string = "none";
-               break;
-       case MTC:
-               src_string = "mtc";
-               break;
-       case JACK:
-               src_string = "jack";
-               break;
-       }
-       child = opthead->add_child ("slave");
-       child->add_property ("type", src_string);
-       
-       child = opthead->add_child ("send-midi-timecode");
-       child->add_property ("val", send_midi_timecode?"yes":"no");
-
-       child = opthead->add_child ("send-midi-machine-control");
-       child->add_property ("val", send_midi_machine_control?"yes":"no");
-
-       snprintf (buf, sizeof(buf)-1, "%x", (int) input_auto_connect);
-       child = opthead->add_child ("input-auto-connect");
-       child->add_property ("val", buf);
-
-       snprintf (buf, sizeof(buf)-1, "%x", (int) output_auto_connect);
-       child = opthead->add_child ("output-auto-connect");
-       child->add_property ("val", buf);
-
-       snprintf (buf, sizeof(buf)-1, "%d", max_level);
-       child = opthead->add_child ("max-level");
-       child->add_property ("val", buf);
-
-       snprintf (buf, sizeof(buf)-1, "%d", min_level);
-       child = opthead->add_child ("min-level");
-       child->add_property ("val", buf);
-
-       snprintf (buf, sizeof(buf)-1, "%f", _meter_hold);
-       child = opthead->add_child ("meter-hold");
-       child->add_property ("val", buf);
-
-       snprintf (buf, sizeof(buf)-1, "%f", _meter_falloff);
-       child = opthead->add_child ("meter-falloff");
-       child->add_property ("val", buf);
-       
-       snprintf (buf, sizeof(buf)-1, "%u", over_length_long);
-       child = opthead->add_child ("long-over-length");
-       child->add_property ("val", buf);
-
-       snprintf (buf, sizeof(buf)-1, "%u", over_length_short);
-       child = opthead->add_child ("short-over-length");
-       child->add_property ("val", buf);
+       XMLNode& option_root = Config->get_variables (mem_fun (*this, &Session::save_config_options_predicate));
 
-       snprintf (buf, sizeof(buf)-1, "%f", shuttle_speed_factor);
-       child = opthead->add_child ("shuttle-speed-factor");
-       child->add_property ("val", buf);
-
-       snprintf (buf, sizeof(buf)-1, "%f", shuttle_speed_threshold);
-       child = opthead->add_child ("shuttle-speed-threshold");
-       child->add_property ("val", buf);
-
-       snprintf (buf, sizeof(buf)-1, "%f", rf_speed);
-       child = opthead->add_child ("rf-speed");
-       child->add_property ("val", buf);
-
-       snprintf (buf, sizeof(buf)-1, "%.2f", smpte_frames_per_second);
-       child = opthead->add_child ("smpte-frames-per-second");
-       child->add_property ("val", buf);
-       
-       child = opthead->add_child ("smpte-drop-frames");
-       child->add_property ("val", smpte_drop_frames ? "yes" : "no");
-       
-       snprintf (buf, sizeof(buf)-1, "%u", smpte_offset ());
-       child = opthead->add_child ("smpte-offset");
-       child->add_property ("val", buf);
-       
-       child = opthead->add_child ("smpte-offset-negative");
-       child->add_property ("val", smpte_offset_negative () ? "yes" : "no");
-       
-       child = opthead->add_child ("edit-mode");
-       switch (_edit_mode) {
-       case Splice:
-               child->add_property ("val", "splice");
-               break;
-
-       case Slide:
-               child->add_property ("val", "slide");
-               break;
-       }
-
-       child = opthead->add_child ("auto-play");
-       child->add_property ("val", get_auto_play () ? "yes" : "no");
-       child = opthead->add_child ("auto-input");
-       child->add_property ("val", get_auto_input () ? "yes" : "no");
-       child = opthead->add_child ("seamless-loop");
-       child->add_property ("val", get_seamless_loop () ? "yes" : "no");
-       child = opthead->add_child ("punch-in");
-       child->add_property ("val", get_punch_in () ? "yes" : "no");
-       child = opthead->add_child ("punch-out");
-       child->add_property ("val", get_punch_out () ? "yes" : "no");
-       child = opthead->add_child ("all-safe");
-       child->add_property ("val", get_all_safe () ? "yes" : "no");
-       child = opthead->add_child ("auto-return");
-       child->add_property ("val", get_auto_return () ? "yes" : "no");
-       child = opthead->add_child ("mmc-control");
-       child->add_property ("val", get_mmc_control () ? "yes" : "no");
-       child = opthead->add_child ("midi-control");
-       child->add_property ("val", get_midi_control () ? "yes" : "no");
-       child = opthead->add_child ("midi-feedback");
-       child->add_property ("val", get_midi_feedback () ? "yes" : "no");
-       child = opthead->add_child ("do-not-record-plugins");
-       child->add_property ("val", get_do_not_record_plugins () ? "yes" : "no");
-       child = opthead->add_child ("auto-crossfade");
-       child->add_property ("val", get_crossfades_active () ? "yes" : "no");
-       child = opthead->add_child ("audible-click");
-       child->add_property ("val", get_clicking () ? "yes" : "no");
-       child = opthead->add_child ("end-marker-is-free");
+       child = option_root.add_child ("end-marker-is-free");
        child->add_property ("val", _end_location_is_free ? "yes" : "no");
 
-       if (click_sound.length()) {
-               child = opthead->add_child ("click-sound");
-               child->add_property ("val", click_sound);
-       }
-
-       if (click_emphasis_sound.length()) {
-               child = opthead->add_child ("click-emphasis-sound");
-               child->add_property ("val", click_emphasis_sound);
-       }
-
-       child = opthead->add_child ("solo-model");
-       child->add_property ("val", _solo_model == SoloBus ? "SoloBus" : "InverseMute");
-
-       child = opthead->add_child ("layer-model");
-       switch (layer_model) {
-       case LaterHigher:
-               child->add_property ("val", X_("LaterHigher"));
-               break;
-       case MoveAddHigher:
-               child->add_property ("val", X_("MoveAddHigher"));
-               break;
-       case AddHigher:
-               child->add_property ("val", X_("AddHigher"));
-               break;
-       }
-
-       child = opthead->add_child ("xfade-model");
-       switch (xfade_model) {
-       case FullCrossfade:
-               child->add_property ("val", X_("Full"));
-               break;
-       case ShortCrossfade:
-               child->add_property ("val", X_("Short"));
-       }
-
-       child = opthead->add_child ("short-xfade-length");
-       /* store as fractions of a second */
-       snprintf (buf, sizeof(buf)-1, "%f", 
-                 (float) Crossfade::short_xfade_length() / frame_rate());
-       child->add_property ("val", buf);
-
-       child = opthead->add_child ("full-xfades-unmuted");
-       child->add_property ("val", crossfades_active ? "yes" : "no");
-
-       return *opthead;
+       return option_root;
 }
 
 XMLNode&
@@ -1349,10 +836,10 @@ Session::state(bool full_state)
                        
                        /* Don't save information about AudioFileSources that are empty */
                        
-                       AudioFileSource* fs;
+                       boost::shared_ptr<AudioFileSource> fs;
 
-                       if ((fs = dynamic_cast<AudioFileSource*> (siter->second)) != 0) {
-                               DestructiveFileSource* dfs = dynamic_cast<DestructiveFileSource*> (fs);
+                       if ((fs = boost::dynamic_pointer_cast<AudioFileSource> (siter->second)) != 0) {
+                               boost::shared_ptr<DestructiveFileSource> dfs = boost::dynamic_pointer_cast<DestructiveFileSource> (fs);
 
                                /* destructive file sources are OK if they are empty, because
                                   we will re-use them every time.
@@ -1387,8 +874,8 @@ Session::state(bool full_state)
        child = node->add_child ("DiskStreams");
 
        { 
-               Glib::RWLock::ReaderLock dl (diskstream_lock);
-               for (DiskstreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
+               boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
+               for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
                        if (!(*i)->hidden()) {
                                child->add_child_nocopy ((*i)->get_state());
                        }
@@ -1480,6 +967,8 @@ Session::state(bool full_state)
 
        node->add_child_nocopy (_tempo_map->get_state());
 
+       node->add_child_nocopy (get_control_protocol_state());
+
        if (_extra_xml) {
                node->add_child_copy (*_extra_xml);
        }
@@ -1487,6 +976,25 @@ Session::state(bool full_state)
        return *node;
 }
 
+XMLNode&
+Session::get_control_protocol_state ()
+{
+       ControlProtocolManager& cpm (ControlProtocolManager::instance());
+       XMLNode* node = new XMLNode (X_("ControlProtocols"));
+
+       cpm.foreach_known_protocol (bind (mem_fun (*this, &Session::add_control_protocol), node));
+       
+       return *node;
+}
+
+void
+Session::add_control_protocol (const ControlProtocolInfo* const cpi, XMLNode* node)
+{
+       if (cpi->protocol) {
+               node->add_child_nocopy (cpi->protocol->get_state());
+       }
+}
+
 int
 Session::set_state (const XMLNode& node)
 {
@@ -1502,12 +1010,12 @@ Session::set_state (const XMLNode& node)
                return -1;
        }
 
-       StateManager::prohibit_save ();
-
        if ((prop = node.property ("name")) != 0) {
                _name = prop->value ();
        }
 
+       setup_raid_path(_path);
+
        if ((prop = node.property (X_("id-counter"))) != 0) {
                uint64_t x;
                sscanf (prop->value().c_str(), "%" PRIu64, &x);
@@ -1531,7 +1039,7 @@ Session::set_state (const XMLNode& node)
        MIDI
        Path
        extra
-       Options
+       Options/Config
        Sources
        AudioRegions
        AudioDiskstreams
@@ -1541,26 +1049,22 @@ Session::set_state (const XMLNode& node)
        EditGroups
        MixGroups
        Click
+       ControlProtocols
        */
 
        if (use_config_midi_ports ()) {
        }
 
-       if ((child = find_named_node (node, "Path")) != 0) {
-               /* XXX this XML content stuff horrible API design */
-               string raid_path = _path + ':' + child->children().front()->content();
-               setup_raid_path (raid_path);
-       } else {
-               /* the path is already set */
-       }
-
        if ((child = find_named_node (node, "extra")) != 0) {
                _extra_xml = new XMLNode (*child);
        }
 
-       if ((child = find_named_node (node, "Options")) == 0) {
+       if (((child = find_named_node (node, "Options")) != 0)) { /* old style */
+               load_options (*child);
+       } else if ((child = find_named_node (node, "Config")) != 0) { /* new style */
+               load_options (*child);
+       } else {
                error << _("Session: XML state has no options section") << endmsg;
-       } else if (load_options (*child)) {
        }
 
        if ((child = find_named_node (node, "Sources")) == 0) {
@@ -1641,8 +1145,6 @@ Session::set_state (const XMLNode& node)
                start_location = location;
        }
 
-       _locations.save_state (_("initial state"));
-
        if ((child = find_named_node (node, "EditGroups")) == 0) {
                error << _("Session: XML state has no edit groups section") << endmsg;
                goto out;
@@ -1677,9 +1179,9 @@ Session::set_state (const XMLNode& node)
                _click_io->set_state (*child);
        }
        
-       /* OK, now we can set edit mode */
-
-       set_edit_mode (pending_edit_mode);
+       if ((child = find_named_node (node, "ControlProtocols")) != 0) {
+               ControlProtocolManager::instance().set_protocol_states (*child);
+       }
 
        /* here beginneth the second phase ... */
 
@@ -1687,11 +1189,8 @@ Session::set_state (const XMLNode& node)
 
        _state_of_the_state = Clean;
 
-       StateManager::allow_save (_("initial state"), true);
-
        if (state_was_pending) {
                save_state (_current_snapshot_name);
-                save_history();
                remove_pending_capture_state ();
                state_was_pending = false;
        }
@@ -1699,8 +1198,6 @@ Session::set_state (const XMLNode& node)
        return 0;
 
   out:
-       /* we failed, re-enable state saving but don't actually save internal state */
-       StateManager::allow_save (X_("ignored"), false);
        return ret;
 }
 
@@ -1709,6 +1206,7 @@ Session::load_routes (const XMLNode& node)
 {
        XMLNodeList nlist;
        XMLNodeConstIterator niter;
+       RouteList new_routes;
 
        nlist = node.children();
 
@@ -1723,9 +1221,11 @@ Session::load_routes (const XMLNode& node)
                        return -1;
                }
 
-               add_route (route);
+               new_routes.push_back (route);
        }
 
+       add_routes (new_routes);
+
        return 0;
 }
 
@@ -1750,7 +1250,7 @@ Session::load_regions (const XMLNode& node)
 {
        XMLNodeList nlist;
        XMLNodeConstIterator niter;
-       AudioRegion* region;
+       boost::shared_ptr<AudioRegion> region;
 
        nlist = node.children();
 
@@ -1761,32 +1261,38 @@ Session::load_regions (const XMLNode& node)
                        error << _("Session: cannot create Region from XML description.") << endmsg;
                }
        }
+
        return 0;
 }
 
-AudioRegion *
+boost::shared_ptr<AudioRegion>
 Session::XMLRegionFactory (const XMLNode& node, bool full)
 {
        const XMLProperty* prop;
-       Source* source;
-       AudioSource* as;
-       AudioRegion::SourceList sources;
+       boost::shared_ptr<Source> source;
+       boost::shared_ptr<AudioSource> as;
+       SourceList sources;
        uint32_t nchans = 1;
        char buf[128];
        
        if (node.name() != X_("Region")) {
-               return 0;
+               return boost::shared_ptr<AudioRegion>();
        }
 
        if ((prop = node.property (X_("channels"))) != 0) {
                nchans = atoi (prop->value().c_str());
        }
 
+
+       if ((prop = node.property ("name")) == 0) {
+               cerr << "no name for this region\n";
+               abort ();
+       }
        
        if ((prop = node.property (X_("source-0"))) == 0) {
                if ((prop = node.property ("source")) == 0) {
                        error << _("Session: XMLNode describing a AudioRegion is incomplete (no source)") << endmsg;
-                       return 0;
+                       return boost::shared_ptr<AudioRegion>();
                }
        }
 
@@ -1794,13 +1300,13 @@ Session::XMLRegionFactory (const XMLNode& node, bool full)
 
        if ((source = source_by_id (s_id)) == 0) {
                error << string_compose(_("Session: XMLNode describing a AudioRegion references an unknown source id =%1"), s_id) << endmsg;
-               return 0;
+               return boost::shared_ptr<AudioRegion>();
        }
-
-       as = dynamic_cast<AudioSource*>(source);
+       
+       as = boost::dynamic_pointer_cast<AudioSource>(source);
        if (!as) {
                error << string_compose(_("Session: XMLNode describing a AudioRegion references a non-audio source id =%1"), s_id) << endmsg;
-               return 0;
+               return boost::shared_ptr<AudioRegion>();
        }
 
        sources.push_back (as);
@@ -1815,24 +1321,26 @@ Session::XMLRegionFactory (const XMLNode& node, bool full)
                        
                        if ((source = source_by_id (id2)) == 0) {
                                error << string_compose(_("Session: XMLNode describing a AudioRegion references an unknown source id =%1"), id2) << endmsg;
-                               return 0;
+                               return boost::shared_ptr<AudioRegion>();
                        }
                        
-                       as = dynamic_cast<AudioSource*>(source);
+                       as = boost::dynamic_pointer_cast<AudioSource>(source);
                        if (!as) {
                                error << string_compose(_("Session: XMLNode describing a AudioRegion references a non-audio source id =%1"), id2) << endmsg;
-                               return 0;
+                               return boost::shared_ptr<AudioRegion>();
                        }
                        sources.push_back (as);
                }
        }
        
        try {
-               return new AudioRegion (sources, node);
+               boost::shared_ptr<AudioRegion> region (boost::dynamic_pointer_cast<AudioRegion> (RegionFactory::create (sources, node)));
+               return region;
+                                                      
        }
 
        catch (failed_constructor& err) {
-               return 0;
+               return boost::shared_ptr<AudioRegion>();
        }
 }
 
@@ -1880,7 +1388,7 @@ Session::load_sources (const XMLNode& node)
 {
        XMLNodeList nlist;
        XMLNodeConstIterator niter;
-       Source* source;
+       boost::shared_ptr<Source> source;
 
        nlist = node.children();
 
@@ -1896,25 +1404,21 @@ Session::load_sources (const XMLNode& node)
        return 0;
 }
 
-Source *
+boost::shared_ptr<Source>
 Session::XMLSourceFactory (const XMLNode& node)
 {
-       Source *src = 0;
-
        if (node.name() != "Source") {
-               return 0;
+               return boost::shared_ptr<Source>();
        }
 
        try {
-               src = AudioFileSource::create (node);
+               return SourceFactory::create (*this, node);
        }
        
        catch (failed_constructor& err) {
                error << _("Found a sound file that cannot be used by Ardour. Talk to the progammers.") << endmsg;
-               return 0;
+               return boost::shared_ptr<Source>();
        }
-
-       return src;
 }
 
 int
@@ -1933,7 +1437,7 @@ Session::save_template (string template_name)
        if ((dp = opendir (dir.c_str()))) {
                closedir (dp);
        } else {
-               if (mkdir (dir.c_str(), S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH)<0) {
+               if (g_mkdir_with_parents (dir.c_str(), S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH)) {
                        error << string_compose(_("Could not create mix templates directory \"%1\" (%2)"), dir, strerror (errno)) << endmsg;
                        return -1;
                }
@@ -2013,11 +1517,9 @@ Session::ensure_sound_dir (string path, string& result)
 
        /* Ensure that the parent directory exists */
        
-       if (mkdir (path.c_str(), 0775)) {
-               if (errno != EEXIST) {
-                       error << string_compose(_("cannot create session directory \"%1\"; ignored"), path) << endmsg;
-                       return -1;
-               }
+       if (g_mkdir_with_parents (path.c_str(), 0775)) {
+               error << string_compose(_("cannot create session directory \"%1\"; ignored"), path) << endmsg;
+               return -1;
        }
        
        /* Ensure that the sounds directory exists */
@@ -2026,33 +1528,27 @@ Session::ensure_sound_dir (string path, string& result)
        result += '/';
        result += sound_dir_name;
        
-       if (mkdir (result.c_str(), 0775)) {
-               if (errno != EEXIST) {
-                       error << string_compose(_("cannot create sounds directory \"%1\"; ignored"), result) << endmsg;
-                       return -1;
-               }
+       if (g_mkdir_with_parents (result.c_str(), 0775)) {
+               error << string_compose(_("cannot create sounds directory \"%1\"; ignored"), result) << endmsg;
+               return -1;
        }
 
        dead = path;
        dead += '/';
        dead += dead_sound_dir_name;
        
-       if (mkdir (dead.c_str(), 0775)) {
-               if (errno != EEXIST) {
-                       error << string_compose(_("cannot create dead sounds directory \"%1\"; ignored"), dead) << endmsg;
-                       return -1;
-               }
+       if (g_mkdir_with_parents (dead.c_str(), 0775)) {
+               error << string_compose(_("cannot create dead sounds directory \"%1\"; ignored"), dead) << endmsg;
+               return -1;
        }
 
        peak = path;
        peak += '/';
        peak += peak_dir_name;
        
-       if (mkdir (peak.c_str(), 0775)) {
-               if (errno != EEXIST) {
-                       error << string_compose(_("cannot create peak file directory \"%1\"; ignored"), peak) << endmsg;
-                       return -1;
-               }
+       if (g_mkdir_with_parents (peak.c_str(), 0775)) {
+               error << string_compose(_("cannot create peak file directory \"%1\"; ignored"), peak) << endmsg;
+               return -1;
        }
        
        /* callers expect this to be terminated ... */
@@ -2067,12 +1563,6 @@ Session::discover_best_sound_dir (bool destructive)
        vector<space_and_path>::iterator i;
        string result;
 
-       /* destructive files all go into the same place */
-
-       if (destructive) {
-               return tape_dir();
-       }
-
        /* handle common case without system calls */
 
        if (session_dirs.size() == 1) {
@@ -2278,20 +1768,41 @@ Session::dead_sound_dir () const
 }
 
 string
-Session::sound_dir () const
+Session::sound_dir (bool with_path) const
 {
-       string res = _path;
+       /* support old session structure */
+
+       struct stat statbuf;
+       string old_nopath;
+       string old_withpath;
+
+       old_nopath += old_sound_dir_name;
+       old_nopath += '/';
+       
+       old_withpath = _path;
+       old_withpath += old_sound_dir_name;
+       old_withpath += '/';
+
+       if (stat (old_withpath.c_str(), &statbuf) == 0) {
+               if (with_path)
+                       return old_withpath;
+               
+               return old_nopath;
+       }
+
+       string res;
+
+       if (with_path) {
+               res = _path;
+       }
+
+       res += interchange_dir_name;
+       res += '/';
+       res += legalize_for_path (_name);
+       res += '/';
        res += sound_dir_name;
        res += '/';
-       return res;
-}
 
-string
-Session::tape_dir () const
-{
-       string res = _path;
-       res += tape_dir_name;
-       res += '/';
        return res;
 }
 
@@ -2479,7 +1990,6 @@ void
 Session::auto_save()
 {
        save_state (_current_snapshot_name);
-        save_history();
 }
 
 RouteGroup *
@@ -2556,26 +2066,11 @@ Session::edit_group_by_name (string name)
        return 0;
 }
 
-void
-Session::set_meter_hold (float val)
-{
-       _meter_hold = val;
-       MeterHoldChanged(); // emit
-}
-
-void
-Session::set_meter_falloff (float val)
-{
-       _meter_falloff = val;
-       MeterFalloffChanged(); // emit
-}
-
-
 void
 Session::begin_reversible_command (string name)
 {
-       current_trans.clear ();
-       current_trans.set_name (name);
+       current_trans = new UndoTransaction;
+       current_trans->set_name (name);
 }
 
 void
@@ -2584,11 +2079,11 @@ Session::commit_reversible_command (Command *cmd)
        struct timeval now;
 
        if (cmd) {
-               current_trans.add_command (cmd);
+               current_trans->add_command (cmd);
        }
 
        gettimeofday (&now, 0);
-       current_trans.set_timestamp (now);
+       current_trans->set_timestamp (now);
 
        history.add (current_trans);
 }
@@ -2882,7 +2377,7 @@ Session::find_all_sources_across_snapshots (set<string>& result, bool exclude_th
 int
 Session::cleanup_sources (Session::cleanup_report& rep)
 {
-       vector<Source*> dead_sources;
+       vector<boost::shared_ptr<Source> > dead_sources;
        vector<Playlist*> playlists_tbd;
        PathScanner scanner;
        string sound_path;
@@ -2931,13 +2426,7 @@ Session::cleanup_sources (Session::cleanup_report& rep)
                delete *x;
        }
 
-       /* step 2: clear the undo/redo history for all playlists */
-
-       for (PlaylistList::iterator x = playlists.begin(); x != playlists.end(); ++x) {
-               (*x)->drop_all_states ();
-       }
-
-       /* step 3: find all un-referenced sources */
+       /* step 2: find all un-referenced sources */
 
        rep.paths.clear ();
        rep.space = 0;
@@ -2954,7 +2443,7 @@ Session::cleanup_sources (Session::cleanup_report& rep)
                   capture files.
                */
 
-               if (i->second->use_cnt() == 0 && i->second->length() > 0) {
+               if (i->second.use_count() == 1 && i->second->length() > 0) {
                        dead_sources.push_back (i->second);
 
                        /* remove this source from our own list to avoid us
@@ -2967,16 +2456,16 @@ Session::cleanup_sources (Session::cleanup_report& rep)
                i = tmp;
        }
 
-       /* Step 4: get rid of all regions in the region list that use any dead sources
+       /* Step 3: get rid of all regions in the region list that use any dead sources
           in case the sources themselves don't go away (they might be referenced in
           other snapshots).
        */
                
-       for (vector<Source*>::iterator i = dead_sources.begin(); i != dead_sources.end();++i) {
+       for (vector<boost::shared_ptr<Source> >::iterator i = dead_sources.begin(); i != dead_sources.end();++i) {
 
                for (AudioRegionList::iterator r = audio_regions.begin(); r != audio_regions.end(); ) {
                        AudioRegionList::iterator tmp;
-                       AudioRegion* ar;
+                       boost::shared_ptr<AudioRegion> ar;
 
                        tmp = r;
                        ++tmp;
@@ -2984,7 +2473,7 @@ Session::cleanup_sources (Session::cleanup_report& rep)
                        ar = r->second;
 
                        for (uint32_t n = 0; n < ar->n_channels(); ++n) {
-                               if (&ar->source (n) == (*i)) {
+                               if (ar->source (n) == (*i)) {
                                        /* this region is dead */
                                        remove_region (ar);
                                }
@@ -3032,9 +2521,9 @@ Session::cleanup_sources (Session::cleanup_report& rep)
         */
        
        for (AudioSourceList::iterator i = audio_sources.begin(); i != audio_sources.end(); ++i) {
-               AudioFileSource* fs;
+               boost::shared_ptr<AudioFileSource> fs;
                
-               if ((fs = dynamic_cast<AudioFileSource*> (i->second)) != 0) {
+               if ((fs = boost::dynamic_pointer_cast<AudioFileSource> (i->second)) != 0) {
                        all_sources.insert (fs->path());
                } 
        }
@@ -3247,7 +2736,7 @@ void
 Session::add_controllable (Controllable* c)
 {
        Glib::Mutex::Lock lm (controllables_lock);
-       controllables.push_back (c);
+       controllables.insert (c);
 }
 
 void
@@ -3258,7 +2747,12 @@ Session::remove_controllable (Controllable* c)
        }
 
        Glib::Mutex::Lock lm (controllables_lock);
-       controllables.remove (c);
+
+       Controllables::iterator x = controllables.find (c);
+
+       if (x != controllables.end()) {
+               controllables.erase (x);
+       }
 }      
 
 Controllable*
@@ -3284,15 +2778,19 @@ Session::add_instant_xml (XMLNode& node, const std::string& dir)
 
 
 int 
-Session::save_history ()
+Session::save_history (string snapshot_name)
 {
     XMLTree tree;
     string xml_path;
     string bak_path;
-
+    
     tree.set_root (&history.get_state());
 
-    xml_path = _path + _current_snapshot_name + ".history"; 
+    if (snapshot_name.empty()) {
+       snapshot_name = _current_snapshot_name;
+    }
+
+    xml_path = _path + snapshot_name + ".history"; 
 
     bak_path = xml_path + ".bak";
 
@@ -3303,6 +2801,8 @@ Session::save_history ()
         return -1;
     }
 
+    cerr << "actually writing history\n";
+
     if (!tree.write (xml_path))
     {
         error << string_compose (_("history could not be saved to %1"), xml_path) << endmsg;
@@ -3326,3 +2826,238 @@ Session::save_history ()
 
     return 0;
 }
+
+int
+Session::restore_history (string snapshot_name)
+{
+    XMLTree tree;
+    string xmlpath;
+
+    /* read xml */
+    xmlpath = _path + snapshot_name + ".history";
+    cerr << string_compose(_("Loading history from '%1'."), xmlpath) << endmsg;
+
+    if (access (xmlpath.c_str(), F_OK)) {
+        error << string_compose(_("%1: session history file \"%2\" doesn't exist!"), _name, xmlpath) << endmsg;
+        return 1;
+    }
+
+    if (!tree.read (xmlpath)) {
+        error << string_compose(_("Could not understand ardour file %1"), xmlpath) << endmsg;
+        return -1;
+    }
+
+    /* replace history */
+    history.clear();
+
+    for (XMLNodeConstIterator it  = tree.root()->children().begin(); it != tree.root()->children().end(); it++) {
+           
+           XMLNode *t = *it;
+           UndoTransaction* ut = new UndoTransaction ();
+           struct timeval tv;
+           
+           ut->set_name(t->property("name")->value());
+           stringstream ss(t->property("tv_sec")->value());
+           ss >> tv.tv_sec;
+           ss.str(t->property("tv_usec")->value());
+           ss >> tv.tv_usec;
+           ut->set_timestamp(tv);
+           
+           for (XMLNodeConstIterator child_it  = t->children().begin();
+                child_it != t->children().end();
+                child_it++)
+           {
+                   XMLNode *n = *child_it;
+                   Command *c;
+       
+                   if (n->name() == "MementoCommand" ||
+                       n->name() == "MementoUndoCommand" ||
+                       n->name() == "MementoRedoCommand") {
+                           if ((c = memento_command_factory(n))) {
+                                   ut->add_command(c);
+                           }
+                   } else {
+                           error << string_compose(_("Couldn't figure out how to make a Command out of a %1 XMLNode."), n->name()) << endmsg;
+                   }
+           }
+
+           history.add (ut);
+    }
+
+    return 0;
+}
+
+void
+Session::config_changed (const char* parameter_name)
+{
+#define PARAM_IS(x) (!strcmp (parameter_name, (x)))
+
+       if (PARAM_IS ("seamless-loop")) {
+               
+       } else if (PARAM_IS ("rf-speed")) {
+               
+       } else if (PARAM_IS ("auto-loop")) {
+               
+       } else if (PARAM_IS ("auto-input")) {
+
+               if (Config->get_monitoring_model() == HardwareMonitoring && transport_rolling()) {
+                       /* auto-input only makes a difference if we're rolling */
+                       
+                       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
+                       
+                       for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
+                               if ((*i)->record_enabled ()) {
+                                       //cerr << "switching to input = " << !auto_input << __FILE__ << __LINE__ << endl << endl;
+                                       (*i)->monitor_input (!Config->get_auto_input());
+                               }
+                       }
+               }
+
+       } else if (PARAM_IS ("punch-in")) {
+
+               Location* location;
+               
+               if ((location = _locations.auto_punch_location()) != 0) {
+                       
+                       if (Config->get_punch_in ()) {
+                               replace_event (Event::PunchIn, location->start());
+                       } else {
+                               remove_event (location->start(), Event::PunchIn);
+                       }
+               }
+               
+       } else if (PARAM_IS ("punch-out")) {
+
+               Location* location;
+               
+               if ((location = _locations.auto_punch_location()) != 0) {
+                       
+                       if (Config->get_punch_out()) {
+                               replace_event (Event::PunchOut, location->end());
+                       } else {
+                               clear_events (Event::PunchOut);
+                       }
+               }
+
+       } else if (PARAM_IS ("edit-mode")) {
+
+               Glib::Mutex::Lock lm (playlist_lock);
+               
+               for (PlaylistList::iterator i = playlists.begin(); i != playlists.end(); ++i) {
+                       (*i)->set_edit_mode (Config->get_edit_mode ());
+               }
+
+       } else if (PARAM_IS ("use-video-sync")) {
+
+               if (transport_stopped()) {
+                       if (Config->get_use_video_sync()) {
+                               waiting_for_sync_offset = true;
+                       }
+               }
+
+       } else if (PARAM_IS ("mmc-control")) {
+
+               poke_midi_thread ();
+
+       } else if (PARAM_IS ("midi-control")) {
+               
+               poke_midi_thread ();
+
+       } else if (PARAM_IS ("raid-path")) {
+
+               setup_raid_path (Config->get_raid_path());
+
+       } else if (PARAM_IS ("smpte-frames-per-second") || PARAM_IS ("smpte-drop-frames")) {
+
+               sync_time_vars ();
+
+       } else if (PARAM_IS ("video-pullup")) {
+
+               sync_time_vars ();
+
+       } else if (PARAM_IS ("seamless-loop")) {
+
+               if (play_loop && transport_rolling()) {
+                       // to reset diskstreams etc
+                       request_play_loop (true);
+               }
+
+       } else if (PARAM_IS ("rf-speed")) {
+
+               cumulative_rf_motion = 0;
+               reset_rf_scale (0);
+
+       } else if (PARAM_IS ("click-sound")) {
+
+               setup_click_sounds (1);
+
+       } else if (PARAM_IS ("click-emphasis-sound")) {
+
+               setup_click_sounds (-1);
+
+       } else if (PARAM_IS ("clicking")) {
+
+               if (Config->get_clicking()) {
+                       if (_click_io && click_data) { // don't require emphasis data
+                               _clicking = true;
+                       }
+               } else {
+                       _clicking = false;
+               }
+
+       } else if (PARAM_IS ("send-mtc")) {
+               
+               /* only set the internal flag if we have
+                  a port.
+               */
+               
+               if (_mtc_port != 0) {
+                       session_send_mtc = Config->get_send_mtc();
+               }
+
+       } else if (PARAM_IS ("send-mmc")) {
+               
+               /* only set the internal flag if we have
+                  a port.
+               */
+               
+               if (_mmc_port != 0) {
+                       session_send_mmc = Config->get_send_mmc();
+               }
+
+       } else if (PARAM_IS ("midi-feedback")) {
+               
+               /* only set the internal flag if we have
+                  a port.
+               */
+               
+               if (_mtc_port != 0) {
+                       session_midi_feedback = Config->get_midi_feedback();
+               }
+
+       } else if (PARAM_IS ("jack-time-master")) {
+
+               engine().reset_timebase ();
+
+       } else if (PARAM_IS ("native-file-header-format")) {
+
+               if (!first_file_header_format_reset) {
+                       reset_native_file_format ();
+               }
+
+               first_file_header_format_reset = false;
+
+       } else if (PARAM_IS ("native-file-data-format")) {
+
+               if (!first_file_data_format_reset) {
+                       reset_native_file_format ();
+               }
+
+               first_file_data_format_reset = false;
+       }
+               
+       set_dirty ();
+                  
+#undef PARAM_IS
+
+}