fixes for destructive track offsets of various kinds; move from jack_nframes_t -...
[ardour.git] / libs / ardour / session.cc
index 4a0d8203811317fc8ea4eeb130beda00d435a75b..2cf86434d7cbcab1941dd70cf4494ab2b81124e7 100644 (file)
@@ -65,6 +65,7 @@
 #include <ardour/playlist.h>
 #include <ardour/click.h>
 #include <ardour/data_type.h>
+#include <ardour/source_factory.h>
 
 #ifdef HAVE_LIBLO
 #include <ardour/osc.h>
@@ -80,10 +81,11 @@ using boost::shared_ptr;
 const char* Session::_template_suffix = X_(".template");
 const char* Session::_statefile_suffix = X_(".ardour");
 const char* Session::_pending_suffix = X_(".pending");
-const char* Session::sound_dir_name = X_("sounds");
-const char* Session::tape_dir_name = X_("tapes");
+const char* Session::old_sound_dir_name = X_("sounds");
+const char* Session::sound_dir_name = X_("audiofiles");
 const char* Session::peak_dir_name = X_("peaks");
 const char* Session::dead_sound_dir_name = X_("dead_sounds");
+const char* Session::interchange_dir_name = X_("interchange");
 
 Session::compute_peak_t                                Session::compute_peak                   = 0;
 Session::apply_gain_to_buffer_t                Session::apply_gain_to_buffer   = 0;
@@ -91,9 +93,11 @@ Session::mix_buffers_with_gain_t     Session::mix_buffers_with_gain  = 0;
 Session::mix_buffers_no_gain_t         Session::mix_buffers_no_gain    = 0;
 
 sigc::signal<int> Session::AskAboutPendingState;
-sigc::signal<void> Session::SMPTEOffsetChanged;
 sigc::signal<void> Session::SendFeedback;
 
+sigc::signal<void> Session::SMPTEOffsetChanged;
+sigc::signal<void> Session::StartTimeChanged;
+sigc::signal<void> Session::EndTimeChanged;
 
 int
 Session::find_session (string str, string& path, string& snapshot, bool& isnew)
@@ -256,6 +260,7 @@ Session::Session (AudioEngine &eng,
          _midi_port (default_midi_port),
          pending_events (2048),
          midi_requests (128), // the size of this should match the midi request pool size
+         diskstreams (new DiskstreamList),
          routes (new RouteList),
          auditioner ((Auditioner*) 0),
          _click_io ((IO*) 0),
@@ -263,18 +268,23 @@ Session::Session (AudioEngine &eng,
 {
        bool new_session;
 
-       cerr << "Loading session " << fullpath << " using snapshot " << snapshot_name << endl;
+       cerr << "Loading session " << fullpath << " using snapshot " << snapshot_name << " (1)" << endl;
 
        n_physical_outputs = _engine.n_physical_outputs();
        n_physical_inputs =  _engine.n_physical_inputs();
 
        first_stage_init (fullpath, snapshot_name);
        
-       if (create (new_session, mix_template, _engine.frame_rate() * 60 * 5)) {
-               throw failed_constructor ();
+       new_session = !g_file_test (_path.c_str(), GFileTest (G_FILE_TEST_EXISTS | G_FILE_TEST_IS_DIR));
+       if (new_session) {
+               if (create (new_session, mix_template, _engine.frame_rate() * 60 * 5)) {
+                       cerr << "create failed\n";
+                       throw failed_constructor ();
+               }
        }
        
        if (second_stage_init (new_session)) {
+               cerr << "2nd state failed\n";
                throw failed_constructor ();
        }
        
@@ -284,6 +294,8 @@ Session::Session (AudioEngine &eng,
 
        _state_of_the_state = StateOfTheState (_state_of_the_state & ~Dirty);
 
+       Config->ParameterChanged.connect (mem_fun (*this, &Session::config_changed));
+
        if (was_dirty) {
                DirtyChanged (); /* EMIT SIGNAL */
        }
@@ -298,7 +310,7 @@ Session::Session (AudioEngine &eng,
                  uint32_t master_out_channels,
                  uint32_t requested_physical_in,
                  uint32_t requested_physical_out,
-                 jack_nframes_t initial_length)
+                 nframes_t initial_length)
 
        : _engine (eng),
          _mmc_port (default_mmc_port),
@@ -306,32 +318,40 @@ Session::Session (AudioEngine &eng,
          _midi_port (default_midi_port),
          pending_events (2048),
          midi_requests (16),
+         diskstreams (new DiskstreamList),
          routes (new RouteList),
          main_outs (0)
 
 {
        bool new_session;
 
-       cerr << "Loading session " << fullpath << " using snapshot " << snapshot_name << endl;
+       cerr << "Loading session " << fullpath << " using snapshot " << snapshot_name << " (2)" << endl;
 
        n_physical_outputs = max (requested_physical_out, _engine.n_physical_outputs());
        n_physical_inputs = max (requested_physical_in, _engine.n_physical_inputs());
 
        first_stage_init (fullpath, snapshot_name);
-       
-       if (create (new_session, 0, initial_length)) {
-               throw failed_constructor ();
+
+       new_session = !g_file_test (_path.c_str(), GFileTest (G_FILE_TEST_EXISTS | G_FILE_TEST_IS_DIR));
+       if (new_session) {
+               if (create (new_session, 0, initial_length)) {
+                       throw failed_constructor ();
+               }
        }
 
        if (control_out_channels) {
                shared_ptr<Route> r (new Route (*this, _("monitor"), -1, control_out_channels, -1, control_out_channels, Route::ControlOut));
-               add_route (r);
+               RouteList rl;
+               rl.push_back (r);
+               add_routes (rl);
                _control_out = r;
        }
 
        if (master_out_channels) {
                shared_ptr<Route> r (new Route (*this, _("master"), -1, master_out_channels, -1, master_out_channels, Route::MasterOut));
-               add_route (r);
+               RouteList rl;
+               rl.push_back (r);
+               add_routes (rl);
                _master_out = r;
        } else {
                /* prohibit auto-connect to master, because there isn't one */
@@ -366,9 +386,23 @@ Session::~Session ()
 
        _state_of_the_state = StateOfTheState (CannotSave|Deletion);
        _engine.remove_session ();
+
+       GoingAway (); /* EMIT SIGNAL */
        
-       going_away (); /* EMIT SIGNAL */
+       /* do this */
+
+       notify_callbacks ();
+
+       /* clear history so that no references to objects are held any more */
+
+       history.clear ();
+
+       /* clear state tree so that no references to objects are held any more */
        
+       if (state_tree) {
+               delete state_tree;
+       }
+
        terminate_butler_thread ();
        terminate_midi_thread ();
        
@@ -427,30 +461,40 @@ Session::~Session ()
 #ifdef TRACK_DESTRUCTION
        cerr << "delete audio regions\n";
 #endif /* TRACK_DESTRUCTION */
-       for (AudioRegionList::iterator i = audio_regions.begin(); i != audio_regions.end(); ) {
-               AudioRegionList::iterator tmp;
-
-               tmp =i;
-               ++tmp;
-
-               delete i->second;
-
-               i = tmp;
+       
+       for (AudioRegionList::iterator i = audio_regions.begin(); i != audio_regions.end(); ++i) {
+               i->second->drop_references ();
        }
+
+       audio_regions.clear ();
        
 #ifdef TRACK_DESTRUCTION
-       cerr << "delete diskstreams\n";
+       cerr << "delete routes\n";
 #endif /* TRACK_DESTRUCTION */
-       for (DiskstreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ) {
-               DiskstreamList::iterator tmp;
+        {
+               RCUWriter<RouteList> writer (routes);
+               boost::shared_ptr<RouteList> r = writer.get_copy ();
+               for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
+                       (*i)->drop_references ();
+               }
+               r->clear ();
+               /* writer goes out of scope and updates master */
+       }
 
-               tmp = i;
-               ++tmp;
+       routes.flush ();
 
-               delete *i;
-
-               i = tmp;
-       }
+#ifdef TRACK_DESTRUCTION
+       cerr << "delete diskstreams\n";
+#endif /* TRACK_DESTRUCTION */
+       {
+              RCUWriter<DiskstreamList> dwriter (diskstreams);
+              boost::shared_ptr<DiskstreamList> dsl = dwriter.get_copy();
+              for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
+                      (*i)->drop_references ();
+              }
+              dsl->clear ();
+       }
+       diskstreams.flush ();
 
 #ifdef TRACK_DESTRUCTION
        cerr << "delete audio sources\n";
@@ -461,11 +505,13 @@ Session::~Session ()
                tmp = i;
                ++tmp;
 
-               delete i->second;
+               i->second->drop_references ();
 
                i = tmp;
        }
 
+       audio_sources.clear ();
+
 #ifdef TRACK_DESTRUCTION
        cerr << "delete mix groups\n";
 #endif /* TRACK_DESTRUCTION */
@@ -521,10 +567,6 @@ Session::~Session ()
        if (mmc) {
                delete mmc;
        }
-
-       if (state_tree) {
-               delete state_tree;
-       }
 }
 
 void
@@ -557,6 +599,8 @@ Session::when_engine_running ()
        set_block_size (_engine.frames_per_cycle());
        set_frame_rate (_engine.frame_rate());
 
+       Config->map_parameters (mem_fun (*this, &Session::config_changed));
+
        /* every time we reconnect, recompute worst case output latencies */
 
        _engine.Running.connect (mem_fun (*this, &Session::set_worst_io_latencies));
@@ -582,7 +626,7 @@ Session::when_engine_running ()
                        
                        if (_click_io->set_state (*child->children().front()) == 0) {
                                
-                               _clicking = click_requested;
+                               _clicking = Config->get_clicking ();
 
                        } else {
 
@@ -600,7 +644,7 @@ Session::when_engine_running ()
                                if (_click_io->add_output_port (first_physical_output, this)) {
                                        // relax, even though its an error
                                } else {
-                                       _clicking = click_requested;
+                                       _clicking = Config->get_clicking ();
                                }
                        }
                }
@@ -613,7 +657,7 @@ Session::when_engine_running ()
        set_worst_io_latencies ();
 
        if (_clicking) {
-                ControlChanged (Clicking); /* EMIT SIGNAL */
+               // XXX HOW TO ALERT UI TO THIS ? DO WE NEED TO?
        }
 
        if (auditioner == 0) {
@@ -859,7 +903,7 @@ Session::playlist_length_changed (Playlist* pl)
 }
 
 void
-Session::diskstream_playlist_changed (Diskstream* dstream)
+Session::diskstream_playlist_changed (boost::shared_ptr<Diskstream> dstream)
 {
        Playlist *playlist;
 
@@ -879,142 +923,52 @@ Session::record_enabling_legal () const
        //      return false;
        // }
 
-       if (all_safe) {
+       if (Config->get_all_safe()) {
                return false;
        }
        return true;
 }
 
-void
-Session::set_auto_play (bool yn)
-{
-       if (auto_play != yn) {
-               auto_play = yn; 
-               set_dirty ();
-               ControlChanged (AutoPlay);
-       }
-}
-
-void
-Session::set_auto_return (bool yn)
-{
-       if (auto_return != yn) {
-               auto_return = yn; 
-               set_dirty ();
-               ControlChanged (AutoReturn);
-       }
-}
-
-void
-Session::set_crossfades_active (bool yn)
-{
-       if (crossfades_active != yn) {
-               crossfades_active = yn; 
-               set_dirty ();
-               ControlChanged (CrossFadesActive);
-       }
-}
-
-void
-Session::set_do_not_record_plugins (bool yn)
-{
-       if (do_not_record_plugins != yn) {
-               do_not_record_plugins = yn; 
-               set_dirty ();
-               ControlChanged (RecordingPlugins); 
-       }
-}
-
-void
-Session::set_auto_input (bool yn)
-{
-       if (auto_input != yn) {
-               auto_input = yn;
-               
-               if (Config->get_use_hardware_monitoring() && transport_rolling()) {
-                       /* auto-input only makes a difference if we're rolling */
-
-                       /* Even though this can called from RT context we are using
-                          a non-tentative rwlock here,  because the action must occur.
-                          The rarity and short potential lock duration makes this "OK"
-                       */
-                       Glib::RWLock::ReaderLock dsm (diskstream_lock);
-                       for (DiskstreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
-                               if ((*i)->record_enabled ()) {
-                                       //cerr << "switching to input = " << !auto_input << __FILE__ << __LINE__ << endl << endl;
-                                       (*i)->monitor_input (!auto_input);   
-                               }
-                       }
-               }
-
-               set_dirty();
-               ControlChanged (AutoInput);
-       }
-}
-
 void
 Session::reset_input_monitor_state ()
 {
        if (transport_rolling()) {
-               Glib::RWLock::ReaderLock dsm (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)->record_enabled ()) {
                                //cerr << "switching to input = " << !auto_input << __FILE__ << __LINE__ << endl << endl;
-                               (*i)->monitor_input (Config->get_use_hardware_monitoring() && !auto_input);
+                               (*i)->monitor_input (Config->get_use_hardware_monitoring() && !Config->get_auto_input());
                        }
                }
        } else {
-               Glib::RWLock::ReaderLock dsm (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)->record_enabled ()) {
-                               //cerr << "switching to input = " << !auto_input << __FILE__ << __LINE__ << endl << endl;
+                               //cerr << "switching to input = " << !Config->get_auto_input() << __FILE__ << __LINE__ << endl << endl;
                                (*i)->monitor_input (Config->get_use_hardware_monitoring());
                        }
                }
        }
 }
 
-
-void
-Session::set_input_auto_connect (bool yn)
-{
-       if (yn) {
-               input_auto_connect = AutoConnectOption (input_auto_connect|AutoConnectPhysical);
-       } else {
-               input_auto_connect = AutoConnectOption (input_auto_connect|~AutoConnectPhysical);
-       }
-       set_dirty ();
-}
-
-bool
-Session::get_input_auto_connect () const
-{
-       return (input_auto_connect & AutoConnectPhysical);
-}
-
-void
-Session::set_output_auto_connect (AutoConnectOption aco)
-{
-       output_auto_connect = aco;
-       set_dirty ();
-}
-
 void
 Session::auto_punch_start_changed (Location* location)
 {
        replace_event (Event::PunchIn, location->start());
 
-       if (get_record_enabled() && get_punch_in()) {
+       if (get_record_enabled() && Config->get_punch_in()) {
                /* capture start has been changed, so save new pending state */
                save_state ("", true);
-                save_history("");
        }
 }      
 
 void
 Session::auto_punch_end_changed (Location* location)
 {
-       jack_nframes_t when_to_stop = location->end();
+       nframes_t when_to_stop = location->end();
        // when_to_stop += _worst_output_latency + _worst_input_latency;
        replace_event (Event::PunchOut, when_to_stop);
 }      
@@ -1022,7 +976,7 @@ Session::auto_punch_end_changed (Location* location)
 void
 Session::auto_punch_changed (Location* location)
 {
-       jack_nframes_t when_to_stop = location->end();
+       nframes_t when_to_stop = location->end();
 
        replace_event (Event::PunchIn, location->start());
        //when_to_stop += _worst_output_latency + _worst_input_latency;
@@ -1034,7 +988,7 @@ Session::auto_loop_changed (Location* location)
 {
        replace_event (Event::AutoLoop, location->end(), location->start());
 
-       if (transport_rolling() && get_auto_loop()) {
+       if (transport_rolling() && play_loop) {
 
                //if (_transport_frame < location->start() || _transport_frame > location->end()) {
 
@@ -1045,7 +999,7 @@ Session::auto_loop_changed (Location* location)
                        request_locate (location->start(), true);
 
                }
-               else if (seamless_loop && !loop_changing) {
+               else if (Config->get_seamless_loop() && !loop_changing) {
                        
                        // schedule a locate-roll to refill the diskstreams at the
                        // previous loop end
@@ -1102,48 +1056,6 @@ Session::set_auto_punch_location (Location* location)
        auto_punch_location_changed (location);
 }
 
-void
-Session::set_punch_in (bool yn)
-{
-       if (punch_in == yn) {
-               return;
-       }
-
-       Location* location;
-
-       if ((location = _locations.auto_punch_location()) != 0) {
-               if ((punch_in = yn) == true) {
-                       replace_event (Event::PunchIn, location->start());
-               } else {
-                       remove_event (location->start(), Event::PunchIn);
-               }
-       }
-
-       set_dirty();
-       ControlChanged (PunchIn); /* EMIT SIGNAL */
-}
-
-void
-Session::set_punch_out (bool yn)
-{
-       if (punch_out == yn) {
-               return;
-       }
-
-       Location* location;
-
-       if ((location = _locations.auto_punch_location()) != 0) {
-               if ((punch_out = yn) == true) {
-                       replace_event (Event::PunchOut, location->end());
-               } else {
-                       clear_events (Event::PunchOut);
-               }
-       }
-
-       set_dirty();
-       ControlChanged (PunchOut); /* EMIT SIGNAL */
-}
-
 void
 Session::set_auto_loop_location (Location* location)
 {
@@ -1237,14 +1149,9 @@ Session::enable_record ()
                _last_record_location = _transport_frame;
                send_mmc_in_another_thread (MIDI::MachineControl::cmdRecordStrobe);
 
-               if (Config->get_use_hardware_monitoring() && auto_input) {
-                       /* Even though this can be called from RT context we are using
-                          a non-tentative rwlock here,  because the action must occur.
-                          The rarity and short potential lock duration makes this "OK"
-                       */
-                       Glib::RWLock::ReaderLock dsm (diskstream_lock);
-                       
-                       for (DiskstreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
+               if (Config->get_use_hardware_monitoring() && Config->get_auto_input()) {
+                       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
+                       for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
                                if ((*i)->record_enabled ()) {
                                        (*i)->monitor_input (true);   
                                }
@@ -1272,14 +1179,10 @@ Session::disable_record (bool rt_context, bool force)
 
                send_mmc_in_another_thread (MIDI::MachineControl::cmdRecordExit);
 
-               if (Config->get_use_hardware_monitoring() && auto_input) {
-                       /* Even though this can be called from RT context we are using
-                          a non-tentative rwlock here,  because the action must occur.
-                          The rarity and short potential lock duration makes this "OK"
-                       */
-                       Glib::RWLock::ReaderLock dsm (diskstream_lock);
+               if (Config->get_use_hardware_monitoring() && Config->get_auto_input()) {
+                       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
                        
-                       for (DiskstreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
+                       for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
                                if ((*i)->record_enabled ()) {
                                        (*i)->monitor_input (false);   
                                }
@@ -1300,14 +1203,10 @@ Session::step_back_from_record ()
        g_atomic_int_set (&_record_status, Enabled);
 
        if (Config->get_use_hardware_monitoring()) {
-               /* Even though this can be called from RT context we are using
-                  a non-tentative rwlock here,  because the action must occur.
-                  The rarity and short potential lock duration makes this "OK"
-               */
-               Glib::RWLock::ReaderLock dsm (diskstream_lock);
+               boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
                
-               for (DiskstreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
-                       if (auto_input && (*i)->record_enabled ()) {
+               for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
+                       if (Config->get_auto_input() && (*i)->record_enabled ()) {
                                //cerr << "switching from input" << __FILE__ << __LINE__ << endl << endl;
                                (*i)->monitor_input (false);   
                        }
@@ -1325,10 +1224,9 @@ Session::maybe_enable_record ()
        */
 
        save_state ("", true);
-        save_history ("");
 
        if (_transport_speed) {
-               if (!punch_in) {
+               if (!Config->get_punch_in()) {
                        enable_record ();
                } 
        } else {
@@ -1339,12 +1237,12 @@ Session::maybe_enable_record ()
        set_dirty();
 }
 
-jack_nframes_t
+nframes_t
 Session::audible_frame () const
 {
-       jack_nframes_t ret;
-       jack_nframes_t offset;
-       jack_nframes_t tf;
+       nframes_t ret;
+       nframes_t offset;
+       nframes_t tf;
 
        /* the first of these two possible settings for "offset"
           mean that the audible frame is stationary until 
@@ -1398,19 +1296,20 @@ Session::audible_frame () const
 }
 
 void
-Session::set_frame_rate (jack_nframes_t frames_per_second)
+Session::set_frame_rate (nframes_t frames_per_second)
 {
-       /** \fn void Session::set_frame_size(jack_nframes_t)
+       /** \fn void Session::set_frame_size(nframes_t)
                the AudioEngine object that calls this guarantees 
                that it will not be called while we are also in
                ::process(). Its fine to do things that block
                here.
        */
 
-       _current_frame_rate = frames_per_second;
-       _frames_per_smpte_frame = (double) _current_frame_rate / (double) smpte_frames_per_second;
+       _base_frame_rate = frames_per_second;
+
+       sync_time_vars();
 
-       Route::set_automation_interval ((jack_nframes_t) ceil ((double) frames_per_second * 0.25));
+       Route::set_automation_interval ((nframes_t) ceil ((double) frames_per_second * 0.25));
 
        // XXX we need some equivalent to this, somehow
        // DestructiveFileSource::setup_standard_crossfades (frames_per_second);
@@ -1421,7 +1320,7 @@ Session::set_frame_rate (jack_nframes_t frames_per_second)
 }
 
 void
-Session::set_block_size (jack_nframes_t nframes)
+Session::set_block_size (nframes_t nframes)
 {
        /* the AudioEngine guarantees 
           that it will not be called while we are also in
@@ -1430,7 +1329,6 @@ Session::set_block_size (jack_nframes_t nframes)
        */
 
        { 
-               Glib::RWLock::ReaderLock dsm (diskstream_lock);
                vector<Sample*>::iterator i;
                uint32_t np;
                        
@@ -1477,7 +1375,8 @@ Session::set_block_size (jack_nframes_t nframes)
                        (*i)->set_block_size (nframes);
                }
                
-               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) {
                        (*i)->set_block_size (nframes);
                }
 
@@ -1489,7 +1388,7 @@ void
 Session::set_default_fade (float steepness, float fade_msecs)
 {
 #if 0
-       jack_nframes_t fade_frames;
+       nframes_t fade_frames;
        
        /* Don't allow fade of less 1 frame */
        
@@ -1500,7 +1399,7 @@ Session::set_default_fade (float steepness, float fade_msecs)
 
        } else {
                
-               fade_frames = (jack_nframes_t) floor (fade_msecs * _current_frame_rate * 0.001);
+               fade_frames = (nframes_t) floor (fade_msecs * _current_frame_rate * 0.001);
                
        }
 
@@ -1657,15 +1556,16 @@ Session::resort_routes_using (shared_ptr<RouteList> r)
        
 }
 
-shared_ptr<AudioTrack>
-Session::new_audio_track (int input_channels, int output_channels, TrackMode mode)
+list<boost::shared_ptr<AudioTrack> >
+Session::new_audio_track (int input_channels, int output_channels, TrackMode mode, uint32_t how_many)
 {
        char track_name[32];
+       uint32_t track_id = 0;
        uint32_t n = 0;
        uint32_t channels_used = 0;
        string port;
-       uint32_t nphysical_in;
-       uint32_t nphysical_out;
+       RouteList new_routes;
+       list<boost::shared_ptr<AudioTrack> > ret;
 
        /* count existing audio tracks */
 
@@ -1682,105 +1582,133 @@ Session::new_audio_track (int input_channels, int output_channels, TrackMode mod
                }
        }
 
-       /* check for duplicate route names, since we might have pre-existing
-          routes with this name (e.g. create Audio1, Audio2, delete Audio1,
-          save, close,restart,add new route - first named route is now
-          Audio2)
-       */
+       vector<string> physinputs;
+       vector<string> physoutputs;
+       uint32_t nphysical_in;
+       uint32_t nphysical_out;
 
-       do {
-               snprintf (track_name, sizeof(track_name), "Audio %" PRIu32, n+1);
-               if (route_by_name (track_name) == 0) {
-                       break;
-               }
-               n++;
+       _engine.get_physical_outputs (physoutputs);
+       _engine.get_physical_inputs (physinputs);
 
-       } while (n < (UINT_MAX-1));
+       while (how_many) {
 
-       if (input_auto_connect & AutoConnectPhysical) {
-               nphysical_in = n_physical_inputs;
-       } else {
-               nphysical_in = 0;
-       }
+               /* check for duplicate route names, since we might have pre-existing
+                  routes with this name (e.g. create Audio1, Audio2, delete Audio1,
+                  save, close,restart,add new route - first named route is now
+                  Audio2)
+               */
+               
 
-       if (output_auto_connect & AutoConnectPhysical) {
-               nphysical_out = n_physical_outputs;
-       } else {
-               nphysical_out = 0;
-       }
+               do {
+                       ++track_id;
 
-       try {
-               shared_ptr<AudioTrack> track (new AudioTrack (*this, track_name, Route::Flag (0), mode));
+                       snprintf (track_name, sizeof(track_name), "Audio %" PRIu32, track_id);
 
-               if (track->ensure_io (input_channels, output_channels, false, this)) {
-                       error << string_compose (_("cannot configure %1 in/%2 out configuration for new audio track"),
-                                         input_channels, output_channels)
-                             << endmsg;
-               }
+                       if (route_by_name (track_name) == 0) {
+                               break;
+                       }
+                       
+               } while (track_id < (UINT_MAX-1));
 
-               if (nphysical_in) {
-                       for (uint32_t x = 0; x < track->n_inputs() && x < nphysical_in; ++x) {
+               if (input_auto_connect & AutoConnectPhysical) {
+                       nphysical_in = min (n_physical_inputs, (uint32_t) physinputs.size());
+               } else {
+                       nphysical_in = 0;
+               }
+               
+               if (output_auto_connect & AutoConnectPhysical) {
+                       nphysical_out = min (n_physical_outputs, (uint32_t) physinputs.size());
+               } else {
+                       nphysical_out = 0;
+               }
+               
+               try {
+                       shared_ptr<AudioTrack> track (new AudioTrack (*this, track_name, Route::Flag (0), mode));
+                       
+                       if (track->ensure_io (input_channels, output_channels, false, this)) {
+                               error << string_compose (_("cannot configure %1 in/%2 out configuration for new audio track"),
+                                                        input_channels, output_channels)
+                                     << endmsg;
+                       }
+                       
+                       if (nphysical_in) {
+                               for (uint32_t x = 0; x < track->n_inputs() && x < nphysical_in; ++x) {
+                                       
+                                       port = "";
+                                       
+                                       if (input_auto_connect & AutoConnectPhysical) {
+                                               port = physinputs[(channels_used+x)%nphysical_in];
+                                       } 
+                                       
+                                       if (port.length() && track->connect_input (track->input (x), port, this)) {
+                                               break;
+                                       }
+                               }
+                       }
+                       
+                       for (uint32_t x = 0; x < track->n_outputs(); ++x) {
                                
                                port = "";
                                
-                               if (input_auto_connect & AutoConnectPhysical) {
-                                       port = _engine.get_nth_physical_input ((channels_used+x)%nphysical_in);
-                               } 
+                               if (nphysical_out && (output_auto_connect & AutoConnectPhysical)) {
+                                       port = physoutputs[(channels_used+x)%nphysical_out];
+                               } else if (output_auto_connect & AutoConnectMaster) {
+                                       if (_master_out) {
+                                               port = _master_out->input (x%_master_out->n_inputs())->name();
+                                       }
+                               }
                                
-                               if (port.length() && track->connect_input (track->input (x), port, this)) {
+                               if (port.length() && track->connect_output (track->output (x), port, this)) {
                                        break;
                                }
                        }
-               }
-               
-               for (uint32_t x = 0; x < track->n_outputs(); ++x) {
                        
-                       port = "";
+                       channels_used += track->n_inputs ();
 
-                       if (nphysical_out && (output_auto_connect & AutoConnectPhysical)) {
-                               port = _engine.get_nth_physical_output ((channels_used+x)%nphysical_out);
-                       } else if (output_auto_connect & AutoConnectMaster) {
-                               if (_master_out) {
-                                       port = _master_out->input (x%_master_out->n_inputs())->name();
+                       if (_control_out) {
+                               vector<string> cports;
+                               uint32_t ni = _control_out->n_inputs();
+                               
+                               for (n = 0; n < ni; ++n) {
+                                       cports.push_back (_control_out->input(n)->name());
                                }
+                               
+                               track->set_control_outs (cports);
                        }
+                       
+                       track->DiskstreamChanged.connect (mem_fun (this, &Session::resort_routes));
+                       track->set_remote_control_id (ntracks());
 
-                       if (port.length() && track->connect_output (track->output (x), port, this)) {
-                               break;
-                       }
+                       new_routes.push_back (track);
+                       ret.push_back (track);
                }
 
-               if (_control_out) {
-                       vector<string> cports;
-                       uint32_t ni = _control_out->n_inputs();
-
-                       for (n = 0; n < ni; ++n) {
-                               cports.push_back (_control_out->input(n)->name());
-                       }
-
-                       track->set_control_outs (cports);
+               catch (failed_constructor &err) {
+                       error << _("Session: could not create new audio track.") << endmsg;
+                       // XXX should we delete the tracks already created? 
+                       ret.clear ();
+                       return ret;
                }
-
-               track->DiskstreamChanged.connect (mem_fun (this, &Session::resort_routes));
-
-               add_route (track);
-
-               track->set_remote_control_id (ntracks());
-               return track;
+               
+               --how_many;
        }
 
-       catch (failed_constructor &err) {
-               error << _("Session: could not create new audio track.") << endmsg;
-               return shared_ptr<AudioTrack> ((AudioTrack*) 0);
+       if (!new_routes.empty()) {
+               add_routes (new_routes, false);
+               save_state (_current_snapshot_name);
        }
+
+       return ret;
 }
 
-shared_ptr<Route>
-Session::new_audio_route (int input_channels, int output_channels)
+Session::RouteList
+Session::new_audio_route (int input_channels, int output_channels, uint32_t how_many)
 {
        char bus_name[32];
+       uint32_t bus_id = 1;
        uint32_t n = 0;
        string port;
+       RouteList ret;
 
        /* count existing audio busses */
 
@@ -1790,127 +1718,148 @@ Session::new_audio_route (int input_channels, int output_channels)
                for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
                        if (dynamic_cast<AudioTrack*>((*i).get()) == 0) {
                                if (!(*i)->hidden()) {
-                                       n++;
+                                       bus_id++;
                                }
                        }
                }
        }
 
-       do {
-               snprintf (bus_name, sizeof(bus_name), "Bus %" PRIu32, n+1);
-               if (route_by_name (bus_name) == 0) {
-                       break;
-               }
-               n++;
+       vector<string> physinputs;
+       vector<string> physoutputs;
 
-       } while (n < (UINT_MAX-1));
+       _engine.get_physical_outputs (physoutputs);
+       _engine.get_physical_inputs (physinputs);
 
-       try {
-               shared_ptr<Route> bus (new Route (*this, bus_name, -1, -1, -1, -1, Route::Flag(0), DataType::AUDIO));
+       while (how_many) {
 
-               if (bus->ensure_io (input_channels, output_channels, false, this)) {
-                       error << string_compose (_("cannot configure %1 in/%2 out configuration for new audio track"),
-                                         input_channels, output_channels)
-                             << endmsg;
-               }
+               do {
+                       ++bus_id;
 
-               for (uint32_t x = 0; x < bus->n_inputs(); ++x) {
-                       
-                       port = "";
+                       snprintf (bus_name, sizeof(bus_name), "Bus %" PRIu32, bus_id);
 
-                       if (input_auto_connect & AutoConnectPhysical) {
-                               port = _engine.get_nth_physical_input ((n+x)%n_physical_inputs);
-                       } 
-                       
-                       if (port.length() && bus->connect_input (bus->input (x), port, this)) {
+                       if (route_by_name (bus_name) == 0) {
                                break;
                        }
-               }
 
-               for (uint32_t x = 0; x < bus->n_outputs(); ++x) {
-                       
-                       port = "";
+               } while (bus_id < (UINT_MAX-1));
 
-                       if (output_auto_connect & AutoConnectPhysical) {
-                               port = _engine.get_nth_physical_input ((n+x)%n_physical_outputs);
-                       } else if (output_auto_connect & AutoConnectMaster) {
-                               if (_master_out) {
-                                       port = _master_out->input (x%_master_out->n_inputs())->name();
+               try {
+                       shared_ptr<Route> bus (new Route (*this, bus_name, -1, -1, -1, -1, Route::Flag(0), DataType::AUDIO));
+                       
+                       if (bus->ensure_io (input_channels, output_channels, false, this)) {
+                               error << string_compose (_("cannot configure %1 in/%2 out configuration for new audio track"),
+                                                        input_channels, output_channels)
+                                     << endmsg;
+                       }
+                       
+                       for (uint32_t x = 0; x < bus->n_inputs(); ++x) {
+                               
+                               port = "";
+                               
+                               if (input_auto_connect & AutoConnectPhysical) {
+                                       port = physinputs[((n+x)%n_physical_inputs)];
+                               } 
+                               
+                               if (port.length() && bus->connect_input (bus->input (x), port, this)) {
+                                       break;
                                }
                        }
-
-                       if (port.length() && bus->connect_output (bus->output (x), port, this)) {
-                               break;
+                       
+                       for (uint32_t x = 0; x < bus->n_outputs(); ++x) {
+                               
+                               port = "";
+                               
+                               if (output_auto_connect & AutoConnectPhysical) {
+                                       port = physoutputs[((n+x)%n_physical_outputs)];
+                               } else if (output_auto_connect & AutoConnectMaster) {
+                                       if (_master_out) {
+                                               port = _master_out->input (x%_master_out->n_inputs())->name();
+                                       }
+                               }
+                               
+                               if (port.length() && bus->connect_output (bus->output (x), port, this)) {
+                                       break;
+                               }
+                       }
+                       
+                       if (_control_out) {
+                               vector<string> cports;
+                               uint32_t ni = _control_out->n_inputs();
+                               
+                               for (uint32_t n = 0; n < ni; ++n) {
+                                       cports.push_back (_control_out->input(n)->name());
+                               }
+                               bus->set_control_outs (cports);
                        }
-               }
 
-               if (_control_out) {
-                       vector<string> cports;
-                       uint32_t ni = _control_out->n_inputs();
+                       ret.push_back (bus);
+               }
+       
 
-                       for (uint32_t n = 0; n < ni; ++n) {
-                               cports.push_back (_control_out->input(n)->name());
-                       }
-                       bus->set_control_outs (cports);
+               catch (failed_constructor &err) {
+                       error << _("Session: could not create new audio route.") << endmsg;
+                       ret.clear ();
+                       return ret;
                }
-               
-               add_route (bus);
-               return bus;
+
+               --how_many;
        }
 
-       catch (failed_constructor &err) {
-               error << _("Session: could not create new audio route.") << endmsg;
-               return shared_ptr<Route> ((Route*) 0);
+       if (!ret.empty()) {
+               add_routes (ret, false);
+               save_state (_current_snapshot_name);
        }
+
+       return ret;
+
 }
 
 void
-Session::add_route (shared_ptr<Route> route)
+Session::add_routes (RouteList& new_routes, bool save)
 {
        { 
                RCUWriter<RouteList> writer (routes);
                shared_ptr<RouteList> r = writer.get_copy ();
-               r->push_front (route);
+               r->insert (r->end(), new_routes.begin(), new_routes.end());
                resort_routes_using (r);
        }
 
-       route->solo_changed.connect (sigc::bind (mem_fun (*this, &Session::route_solo_changed), route));
-       route->mute_changed.connect (mem_fun (*this, &Session::route_mute_changed));
-       route->output_changed.connect (mem_fun (*this, &Session::set_worst_io_latencies_x));
-       route->redirects_changed.connect (mem_fun (*this, &Session::update_latency_compensation_proxy));
-
-       if (route->master()) {
-               _master_out = route;
-       }
-
-       if (route->control()) {
-               _control_out = route;
+       for (RouteList::iterator x = new_routes.begin(); x != new_routes.end(); ++x) {
+               (*x)->solo_changed.connect (sigc::bind (mem_fun (*this, &Session::route_solo_changed), (*x)));
+               (*x)->mute_changed.connect (mem_fun (*this, &Session::route_mute_changed));
+               (*x)->output_changed.connect (mem_fun (*this, &Session::set_worst_io_latencies_x));
+               (*x)->redirects_changed.connect (mem_fun (*this, &Session::update_latency_compensation_proxy));
+               
+               if ((*x)->master()) {
+                       _master_out = (*x);
+               }
+               
+               if ((*x)->control()) {
+                       _control_out = (*x);
+               }
        }
 
        set_dirty();
-       save_state (_current_snapshot_name);
-       save_history (_current_snapshot_name);
 
-       RouteAdded (route); /* EMIT SIGNAL */
+       if (save) {
+               save_state (_current_snapshot_name);
+       }
+
+       RouteAdded (new_routes); /* EMIT SIGNAL */
 }
 
 void
-Session::add_diskstream (Diskstream* dstream)
+Session::add_diskstream (boost::shared_ptr<Diskstream> dstream)
 {
        /* need to do this in case we're rolling at the time, to prevent false underruns */
        dstream->do_refill_with_alloc();
        
        { 
-               Glib::RWLock::WriterLock lm (diskstream_lock);
-               diskstreams.push_back (dstream);
+               RCUWriter<DiskstreamList> writer (diskstreams);
+               boost::shared_ptr<DiskstreamList> ds = writer.get_copy();
+               ds->push_back (dstream);
        }
 
-       /* take a reference to the diskstream, preventing it from
-          ever being deleted until the session itself goes away,
-          or chooses to remove it for its own purposes.
-       */
-
-       dstream->ref();
        dstream->set_block_size (current_block_size);
 
        dstream->PlaylistChanged.connect (sigc::bind (mem_fun (*this, &Session::diskstream_playlist_changed), dstream));
@@ -1918,12 +1867,6 @@ Session::add_diskstream (Diskstream* dstream)
        diskstream_playlist_changed (dstream);
 
        dstream->prepare ();
-
-       set_dirty();
-       save_state (_current_snapshot_name);
-        save_history (_current_snapshot_name);
-
-       DiskstreamAdded (dstream); /* EMIT SIGNAL */
 }
 
 void
@@ -1962,20 +1905,19 @@ Session::remove_route (shared_ptr<Route> route)
 
        // FIXME: audio specific
        AudioTrack* at;
-       AudioDiskstream* ds = 0;
+       boost::shared_ptr<AudioDiskstream> ds;
        
        if ((at = dynamic_cast<AudioTrack*>(route.get())) != 0) {
-               ds = &at->audio_diskstream();
+               ds = at->audio_diskstream();
        }
        
        if (ds) {
 
                {
-                       Glib::RWLock::WriterLock lm (diskstream_lock);
-                       diskstreams.remove (ds);
+                       RCUWriter<DiskstreamList> dsl (diskstreams);
+                       boost::shared_ptr<DiskstreamList> d = dsl.get_copy();
+                       d->remove (ds);
                }
-
-               ds->unref ();
        }
 
        find_current_end ();
@@ -1986,9 +1928,10 @@ Session::remove_route (shared_ptr<Route> route)
        /* XXX should we disconnect from the Route's signals ? */
 
        save_state (_current_snapshot_name);
-       save_history (_current_snapshot_name);
 
-       /* all shared ptrs to route should go out of scope here */
+       /* try to cause everyone to drop their references */
+
+       route->drop_references ();
 }      
 
 void
@@ -2043,7 +1986,7 @@ Session::route_solo_changed (void* src, shared_ptr<Route> route)
                                   then leave it as it is.
                                */
                                
-                               if (_solo_latched) {
+                               if (Config->get_solo_latched()) {
                                        continue;
                                } 
                        }
@@ -2092,16 +2035,6 @@ Session::route_solo_changed (void* src, shared_ptr<Route> route)
        set_dirty();
 }
 
-void
-Session::set_solo_latched (bool yn)
-{
-       if (yn != _solo_latched) {
-               _solo_latched = yn;
-               set_dirty ();
-               ControlChanged (SoloLatch);
-       }
-}
-
 void
 Session::update_route_solo_state ()
 {
@@ -2226,6 +2159,20 @@ Session::route_by_name (string name)
        return shared_ptr<Route> ((Route*) 0);
 }
 
+shared_ptr<Route>
+Session::route_by_id (PBD::ID id)
+{
+       shared_ptr<RouteList> r = routes.reader ();
+
+       for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
+               if ((*i)->id() == id) {
+                       return *i;
+               }
+       }
+
+       return shared_ptr<Route> ((Route*) 0);
+}
+
 shared_ptr<Route>
 Session::route_by_remote_id (uint32_t id)
 {
@@ -2247,7 +2194,7 @@ Session::find_current_end ()
                return;
        }
 
-       jack_nframes_t max = get_maximum_extent ();
+       nframes_t max = get_maximum_extent ();
 
        if (max > end_location->end()) {
                end_location->set_end (max);
@@ -2256,17 +2203,15 @@ Session::find_current_end ()
        }
 }
 
-jack_nframes_t
+nframes_t
 Session::get_maximum_extent () const
 {
-       jack_nframes_t max = 0;
-       jack_nframes_t me; 
+       nframes_t max = 0;
+       nframes_t me; 
 
-       /* Don't take the diskstream lock. Caller must have other ways to
-          ensure atomicity.
-       */
+       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 
-       for (DiskstreamList::const_iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
+       for (DiskstreamList::const_iterator i = dsl->begin(); i != dsl->end(); ++i) {
                Playlist* pl = (*i)->playlist();
                if ((me = pl->get_maximum_extent()) > max) {
                        max = me;
@@ -2276,32 +2221,32 @@ Session::get_maximum_extent () const
        return max;
 }
 
-Diskstream *
+boost::shared_ptr<Diskstream>
 Session::diskstream_by_name (string name)
 {
-       Glib::RWLock::ReaderLock lm (diskstream_lock);
+       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 
-       for (DiskstreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
+       for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
                if ((*i)->name() == name) {
-                       returni;
+                       return *i;
                }
        }
 
-       return 0;
+       return boost::shared_ptr<Diskstream>((Diskstream*) 0);
 }
 
-Diskstream *
+boost::shared_ptr<Diskstream>
 Session::diskstream_by_id (const PBD::ID& id)
 {
-       Glib::RWLock::ReaderLock lm (diskstream_lock);
+       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 
-       for (DiskstreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
+       for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
                if ((*i)->id() == id) {
                        return *i;
                }
        }
 
-       return 0;
+       return boost::shared_ptr<Diskstream>((Diskstream*) 0);
 }
 
 /* AudioRegion management */
@@ -2425,24 +2370,24 @@ Session::region_name (string& result, string base, bool newlevel) const
 }      
 
 void
-Session::add_region (Region* region)
+Session::add_region (boost::shared_ptr<Region> region)
 {
-       AudioRegion* ar = 0;
-       AudioRegion* oar = 0;
+       boost::shared_ptr<AudioRegion> ar;
+       boost::shared_ptr<AudioRegion> oar;
        bool added = false;
 
        { 
                Glib::Mutex::Lock lm (region_lock);
 
-               if ((ar = dynamic_cast<AudioRegion*> (region)) != 0) {
+               if ((ar = boost::dynamic_pointer_cast<AudioRegion> (region)) != 0) {
 
                        AudioRegionList::iterator x;
 
                        for (x = audio_regions.begin(); x != audio_regions.end(); ++x) {
 
-                               oar = dynamic_cast<AudioRegion*> (x->second);
+                               oar = boost::dynamic_pointer_cast<AudioRegion> (x->second);
 
-                               if (ar->region_list_equivalent (*oar)) {
+                               if (ar->region_list_equivalent (oar)) {
                                        break;
                                }
                        }
@@ -2455,6 +2400,7 @@ Session::add_region (Region* region)
                                entry.second = ar;
 
                                pair<AudioRegionList::iterator,bool> x = audio_regions.insert (entry);
+
                                
                                if (!x.second) {
                                        return;
@@ -2480,14 +2426,14 @@ Session::add_region (Region* region)
        set_dirty();
        
        if (added) {
-               region->GoingAway.connect (mem_fun (*this, &Session::remove_region));
+               region->GoingAway.connect (sigc::bind (mem_fun (*this, &Session::remove_region), region));
                region->StateChanged.connect (sigc::bind (mem_fun (*this, &Session::region_changed), region));
                AudioRegionAdded (ar); /* EMIT SIGNAL */
        }
 }
 
 void
-Session::region_changed (Change what_changed, Region* region)
+Session::region_changed (Change what_changed, boost::shared_ptr<Region> region)
 {
        if (what_changed & Region::HiddenChanged) {
                /* relay hidden changes */
@@ -2496,22 +2442,22 @@ Session::region_changed (Change what_changed, Region* region)
 }
 
 void
-Session::region_renamed (Region* region)
+Session::region_renamed (boost::shared_ptr<Region> region)
 {
        add_region (region);
 }
 
 void
-Session::remove_region (Region* region)
+Session::remove_region (boost::shared_ptr<Region> region)
 {
        AudioRegionList::iterator i;
-       AudioRegion* ar = 0;
+       boost::shared_ptr<AudioRegion> ar;
        bool removed = false;
        
        { 
                Glib::Mutex::Lock lm (region_lock);
 
-               if ((ar = dynamic_cast<AudioRegion*> (region)) != 0) {
+               if ((ar = boost::dynamic_pointer_cast<AudioRegion> (region)) != 0) {
                        if ((i = audio_regions.find (region->id())) != audio_regions.end()) {
                                audio_regions.erase (i);
                                removed = true;
@@ -2537,11 +2483,11 @@ Session::remove_region (Region* region)
        }
 }
 
-AudioRegion*
-Session::find_whole_file_parent (AudioRegion& child)
+boost::shared_ptr<AudioRegion>
+Session::find_whole_file_parent (boost::shared_ptr<AudioRegion> child)
 {
        AudioRegionList::iterator i;
-       AudioRegion* region;
+       boost::shared_ptr<AudioRegion> region;
        Glib::Mutex::Lock lm (region_lock);
 
        for (i = audio_regions.begin(); i != audio_regions.end(); ++i) {
@@ -2550,49 +2496,51 @@ Session::find_whole_file_parent (AudioRegion& child)
 
                if (region->whole_file()) {
 
-                       if (child.source_equivalent (*region)) {
+                       if (child->source_equivalent (region)) {
                                return region;
                        }
                }
        } 
 
-       return 0;
+       return boost::shared_ptr<AudioRegion> ((AudioRegion*) 0);
 }      
 
 void
-Session::find_equivalent_playlist_regions (Region& region, vector<Region*>& result)
+Session::find_equivalent_playlist_regions (boost::shared_ptr<Region> region, vector<boost::shared_ptr<Region> >& result)
 {
        for (PlaylistList::iterator i = playlists.begin(); i != playlists.end(); ++i)
                (*i)->get_region_list_equivalent_regions (region, result);
 }
 
 int
-Session::destroy_region (Region* region)
+Session::destroy_region (boost::shared_ptr<Region> region)
 {
-       AudioRegion* aregion;
+       boost::shared_ptr<AudioRegion> aregion;
 
-       if ((aregion = dynamic_cast<AudioRegion*> (region)) == 0) {
+       if ((aregion = boost::dynamic_pointer_cast<AudioRegion> (region)) == 0) {
                return 0;
        }
-
+       
        if (aregion->playlist()) {
                aregion->playlist()->destroy_region (region);
        }
 
-       vector<Source*> srcs;
+       vector<boost::shared_ptr<Source> > srcs;
        
        for (uint32_t n = 0; n < aregion->n_channels(); ++n) {
-               srcs.push_back (&aregion->source (n));
+               srcs.push_back (aregion->source (n));
        }
 
-       for (vector<Source*>::iterator i = srcs.begin(); i != srcs.end(); ++i) {
+       for (vector<boost::shared_ptr<Source> >::iterator i = srcs.begin(); i != srcs.end(); ++i) {
                
-               if ((*i)->use_cnt() == 0) {
-                       AudioFileSource* afs = dynamic_cast<AudioFileSource*>(*i);
+               if ((*i).use_count() == 1) {
+                       boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(*i);
+
                        if (afs) {
                                (afs)->mark_for_remove ();
                        }
-                       delete *i;
+                       
+                       (*i)->drop_references ();
                }
        }
 
@@ -2600,9 +2548,9 @@ Session::destroy_region (Region* region)
 }
 
 int
-Session::destroy_regions (list<Region*> regions)
+Session::destroy_regions (list<boost::shared_ptr<Region> > regions)
 {
-       for (list<Region*>::iterator i = regions.begin(); i != regions.end(); ++i) {
+       for (list<boost::shared_ptr<Region> >::iterator i = regions.begin(); i != regions.end(); ++i) {
                destroy_region (*i);
        }
        return 0;
@@ -2611,12 +2559,12 @@ Session::destroy_regions (list<Region*> regions)
 int
 Session::remove_last_capture ()
 {
-       list<Region*> r;
-
-       Glib::RWLock::ReaderLock lm (diskstream_lock);
+       list<boost::shared_ptr<Region> > r;
+       
+       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
        
-       for (DiskstreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
-               list<Region*>& l = (*i)->last_capture_regions();
+       for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
+               list<boost::shared_ptr<Region> >& l = (*i)->last_capture_regions();
                
                if (!l.empty()) {
                        r.insert (r.end(), l.begin(), l.end());
@@ -2629,64 +2577,83 @@ Session::remove_last_capture ()
 }
 
 int
-Session::remove_region_from_region_list (Region& r)
+Session::remove_region_from_region_list (boost::shared_ptr<Region> r)
 {
-       remove_region (&r);
+       remove_region (r);
        return 0;
 }
 
 /* Source Management */
 
 void
-Session::add_audio_source (AudioSource* source)
+Session::add_source (boost::shared_ptr<Source> source)
 {
-       pair<AudioSourceList::key_type, AudioSourceList::mapped_type> entry;
+       boost::shared_ptr<AudioFileSource> afs;
+
+       if ((afs = boost::dynamic_pointer_cast<AudioFileSource>(source)) != 0) {
+
+               pair<AudioSourceList::key_type, AudioSourceList::mapped_type> entry;
+               pair<AudioSourceList::iterator,bool> result;
 
-       {
-               Glib::Mutex::Lock lm (audio_source_lock);
                entry.first = source->id();
-               entry.second = source;
-               audio_sources.insert (entry);
-       }
-       
-       source->GoingAway.connect (mem_fun (this, &Session::remove_source));
-       set_dirty();
-       
-       SourceAdded (source); /* EMIT SIGNAL */
+               entry.second = afs;
+               
+               {
+                       Glib::Mutex::Lock lm (audio_source_lock);
+                       result = audio_sources.insert (entry);
+               }
+
+               if (!result.second) {
+                       cerr << "\tNOT inserted ? " << result.second << endl;
+               }
+
+               source->GoingAway.connect (sigc::bind (mem_fun (this, &Session::remove_source), boost::weak_ptr<Source> (source)));
+               set_dirty();
+               
+               SourceAdded (source); /* EMIT SIGNAL */
+       } else {
+               cerr << "\tNOT AUDIO FILE\n";
+       }
 }
 
 void
-Session::remove_source (Source* source)
+Session::remove_source (boost::weak_ptr<Source> src)
 {
        AudioSourceList::iterator i;
+       boost::shared_ptr<Source> source = src.lock();
 
-       { 
-               Glib::Mutex::Lock lm (audio_source_lock);
-
-               if ((i = audio_sources.find (source->id())) != audio_sources.end()) {
-                       audio_sources.erase (i);
-               } 
-       }
-
-       if (!_state_of_the_state & InCleanup) {
-
-               /* save state so we don't end up with a session file
-                  referring to non-existent sources.
-               */
+       if (!source) {
+               cerr << "removing a source DEAD\n";
+       } else {
+               cerr << "removing a source " << source->name () << endl;
                
-               save_state (_current_snapshot_name);
-                save_history (_current_snapshot_name);
+               { 
+                       Glib::Mutex::Lock lm (audio_source_lock);
+                       
+                       if ((i = audio_sources.find (source->id())) != audio_sources.end()) {
+                               audio_sources.erase (i);
+                       } 
+               }
+               
+               if (!_state_of_the_state & InCleanup) {
+                       
+                       /* save state so we don't end up with a session file
+                          referring to non-existent sources.
+                       */
+                       
+                       save_state (_current_snapshot_name);
+               }
+               
+               SourceRemoved(source); /* EMIT SIGNAL */
        }
-
-       SourceRemoved(source); /* EMIT SIGNAL */
 }
 
-Source *
+boost::shared_ptr<Source>
 Session::source_by_id (const PBD::ID& id)
 {
        Glib::Mutex::Lock lm (audio_source_lock);
        AudioSourceList::iterator i;
-       Source* source = 0;
+       boost::shared_ptr<Source> source;
 
        if ((i = audio_sources.find (id)) != audio_sources.end()) {
                source = i->second;
@@ -2698,17 +2665,11 @@ Session::source_by_id (const PBD::ID& id)
 }
 
 string
-Session::peak_path_from_audio_path (string audio_path)
+Session::peak_path_from_audio_path (string audio_path) const
 {
-       /* XXX hardly bombproof! fix me */
-
        string res;
 
-       res = Glib::path_get_dirname (audio_path);
-       res = Glib::path_get_dirname (res);
-       res += '/';
-       res += peak_dir_name;
-       res += '/';
+       res = peak_dir ();
        res += PBD::basename_nosuffix (audio_path);
        res += ".peak";
 
@@ -2854,11 +2815,7 @@ Session::audio_path_from_name (string name, uint32_t nchan, uint32_t chan, bool
 
                        spath = (*i).path;
 
-                       if (destructive) {
-                               spath += tape_dir_name;
-                       } else {
-                               spath += sound_dir_name;
-                       }
+                       spath += sound_dir (false);
 
                        if (destructive) {
                                if (nchan < 2) {
@@ -2894,9 +2851,10 @@ Session::audio_path_from_name (string name, uint32_t nchan, uint32_t chan, bool
                                }
                        }
 
-                       if (access (buf, F_OK) == 0) {
+                       if (g_file_test (buf, G_FILE_TEST_EXISTS)) {
                                existing++;
-                       }
+                       } 
+
                }
 
                if (existing == 0) {
@@ -2915,11 +2873,7 @@ Session::audio_path_from_name (string name, uint32_t nchan, uint32_t chan, bool
 
        string foo = buf;
 
-       if (destructive) {
-               spath = tape_dir ();
-       } else {
-               spath = discover_best_sound_dir ();
-       }
+       spath = discover_best_sound_dir ();
 
        string::size_type pos = foo.find_last_of ('/');
        
@@ -2932,24 +2886,11 @@ Session::audio_path_from_name (string name, uint32_t nchan, uint32_t chan, bool
        return spath;
 }
 
-AudioFileSource *
+boost::shared_ptr<AudioFileSource>
 Session::create_audio_source_for_session (AudioDiskstream& ds, uint32_t chan, bool destructive)
 {
        string spath = audio_path_from_name (ds.name(), ds.n_channels(), chan, destructive);
-
-       /* this might throw failed_constructor(), which is OK */
-       
-       if (destructive) {
-               return new DestructiveFileSource (spath,
-                                                 Config->get_native_file_data_format(),
-                                                 Config->get_native_file_header_format(),
-                                                 frame_rate());
-       } else {
-               return new SndFileSource (spath, 
-                                         Config->get_native_file_data_format(),
-                                         Config->get_native_file_header_format(),
-                                         frame_rate());
-       }
+       return boost::dynamic_pointer_cast<AudioFileSource> (SourceFactory::createWritable (*this, spath, destructive, frame_rate()));
 }
 
 /* Playlist management */
@@ -2984,7 +2925,7 @@ Session::add_playlist (Playlist* playlist)
                        playlists.insert (playlists.begin(), playlist);
                        // playlist->ref();
                        playlist->InUse.connect (mem_fun (*this, &Session::track_playlist));
-                       playlist->GoingAway.connect (mem_fun (*this, &Session::remove_playlist));
+                       playlist->GoingAway.connect (sigc::bind (mem_fun (*this, &Session::remove_playlist), playlist));
                }
        }
 
@@ -3055,50 +2996,47 @@ Session::remove_playlist (Playlist* playlist)
 }
 
 void 
-Session::set_audition (AudioRegion* r)
+Session::set_audition (boost::shared_ptr<Region> r)
 {
        pending_audition_region = r;
        post_transport_work = PostTransportWork (post_transport_work | PostTransportAudition);
        schedule_butler_transport_work ();
 }
 
+void
+Session::audition_playlist ()
+{
+       Event* ev = new Event (Event::Audition, Event::Add, Event::Immediate, 0, 0.0);
+       ev->region.reset ();
+       queue_event (ev);
+}
+
 void
 Session::non_realtime_set_audition ()
 {
-       if (pending_audition_region == (AudioRegion*) 0xfeedface) {
+       if (!pending_audition_region) {
                auditioner->audition_current_playlist ();
-       } else if (pending_audition_region) {
-               auditioner->audition_region (*pending_audition_region);
+       } else {
+               auditioner->audition_region (pending_audition_region);
+               pending_audition_region.reset ();
        }
-       pending_audition_region = 0;
        AuditionActive (true); /* EMIT SIGNAL */
 }
 
 void
-Session::audition_playlist ()
+Session::audition_region (boost::shared_ptr<Region> r)
 {
        Event* ev = new Event (Event::Audition, Event::Add, Event::Immediate, 0, 0.0);
-       ev->set_ptr ((void*) 0xfeedface);
+       ev->region = r;
        queue_event (ev);
 }
 
-void
-Session::audition_region (Region& r)
-{
-       AudioRegion* ar = dynamic_cast<AudioRegion*>(&r);
-       if (ar) {
-               Event* ev = new Event (Event::Audition, Event::Add, Event::Immediate, 0, 0.0);
-               ev->set_ptr (ar);
-               queue_event (ev);
-       }
-}
-
 void
 Session::cancel_audition ()
 {
        if (auditioner->active()) {
                auditioner->cancel_audition ();
-                AuditionActive (false); /* EMIT SIGNAL */
+               AuditionActive (false); /* EMIT SIGNAL */
        }
 }
 
@@ -3111,17 +3049,35 @@ Session::RoutePublicOrderSorter::operator() (boost::shared_ptr<Route> a, boost::
 void
 Session::remove_empty_sounds ()
 {
-
        PathScanner scanner;
-       string dir;
-
-       dir = sound_dir ();
 
-       vector<string *>* possible_audiofiles = scanner (dir, "\\.wav$", false, true);
+       vector<string *>* possible_audiofiles = scanner (sound_dir(), "\\.(wav|aiff|caf|w64)$", false, true);
        
+       Glib::Mutex::Lock lm (audio_source_lock);
+       
+       regex_t compiled_tape_track_pattern;
+       int err;
+
+       if ((err = regcomp (&compiled_tape_track_pattern, "/T[0-9][0-9][0-9][0-9]-", REG_EXTENDED|REG_NOSUB))) {
+
+               char msg[256];
+               
+               regerror (err, &compiled_tape_track_pattern, msg, sizeof (msg));
+               
+               error << string_compose (_("Cannot compile tape track regexp for use (%1)"), msg) << endmsg;
+               return;
+       }
+
        for (vector<string *>::iterator i = possible_audiofiles->begin(); i != possible_audiofiles->end(); ++i) {
+               
+               /* never remove files that appear to be a tape track */
 
-               if (AudioFileSource::is_empty (*(*i))) {
+               if (regexec (&compiled_tape_track_pattern, (*i)->c_str(), 0, 0, 0) == 0) {
+                       delete *i;
+                       continue;
+               }
+                       
+               if (AudioFileSource::is_empty (*this, *(*i))) {
 
                        unlink ((*i)->c_str());
                        
@@ -3177,10 +3133,11 @@ Session::set_all_mute (bool yn)
 uint32_t
 Session::n_diskstreams () const
 {
-       Glib::RWLock::ReaderLock lm (diskstream_lock);
        uint32_t n = 0;
 
-       for (DiskstreamList::const_iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
+       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
+
+       for (DiskstreamList::const_iterator i = dsl->begin(); i != dsl->end(); ++i) {
                if (!(*i)->hidden()) {
                        n++;
                }
@@ -3199,15 +3156,15 @@ Session::graph_reordered ()
                return;
        }
 
-       Glib::RWLock::ReaderLock lm2 (diskstream_lock);
-
        resort_routes ();
 
        /* force all diskstreams to update their capture offset values to 
           reflect any changes in latencies within the graph.
        */
        
-       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) {
                (*i)->set_capture_offset ();
        }
 }
@@ -3264,7 +3221,7 @@ Session::add_redirect (Redirect* redirect)
                /*NOTREACHED*/
        }
 
-       redirect->GoingAway.connect (mem_fun (*this, &Session::remove_redirect));
+       redirect->GoingAway.connect (sigc::bind (mem_fun (*this, &Session::remove_redirect), redirect));
 
        set_dirty();
 }
@@ -3296,16 +3253,16 @@ Session::remove_redirect (Redirect* redirect)
        set_dirty();
 }
 
-jack_nframes_t
+nframes_t
 Session::available_capture_duration ()
 {
        const double scale = 4096.0 / sizeof (Sample);
-       
+
        if (_total_free_4k_blocks * scale > (double) max_frames) {
                return max_frames;
        }
        
-       return (jack_nframes_t) floor (_total_free_4k_blocks * scale);
+       return (nframes_t) floor (_total_free_4k_blocks * scale);
 }
 
 void
@@ -3357,23 +3314,6 @@ Session::connection_by_name (string name) const
        return 0;
 }
 
-void
-Session::set_edit_mode (EditMode mode)
-{
-       _edit_mode = mode;
-       
-       { 
-               Glib::Mutex::Lock lm (playlist_lock);
-               
-               for (PlaylistList::iterator i = playlists.begin(); i != playlists.end(); ++i) {
-                       (*i)->set_edit_mode (mode);
-               }
-       }
-
-       set_dirty ();
-       ControlChanged (EditingMode); /* EMIT SIGNAL */
-}
-
 void
 Session::tempo_map_changed (Change ignored)
 {
@@ -3486,11 +3426,9 @@ Session::remove_named_selection (NamedSelection* named_selection)
 void
 Session::reset_native_file_format ()
 {
-       // jlc - WHY take routelock?
-       //RWLockMonitor lm1 (route_lock, true, __LINE__, __FILE__);
-       Glib::RWLock::ReaderLock lm2 (diskstream_lock);
+       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 
-       for (DiskstreamList::iterator i = diskstreams.begin(); i != diskstreams.end(); ++i) {
+       for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
                (*i)->reset_write_sources (false);
        }
 }
@@ -3510,9 +3448,9 @@ Session::route_name_unique (string n) const
 }
 
 int
-Session::cleanup_audio_file_source (AudioFileSource& fs)
+Session::cleanup_audio_file_source (boost::shared_ptr<AudioFileSource> fs)
 {
-       return fs.move_to_trash (dead_sound_dir_name);
+       return fs->move_to_trash (dead_sound_dir_name);
 }
 
 uint32_t
@@ -3523,17 +3461,7 @@ Session::n_playlists () const
 }
 
 void
-Session::set_solo_model (SoloModel sm)
-{
-       if (sm != _solo_model) {
-               _solo_model = sm;
-               ControlChanged (SoloingModel);
-               set_dirty ();
-       }
-}
-
-void
-Session::allocate_pan_automation_buffers (jack_nframes_t nframes, uint32_t howmany, bool force)
+Session::allocate_pan_automation_buffers (nframes_t nframes, uint32_t howmany, bool force)
 {
        if (!force && howmany <= _npan_buffers) {
                return;
@@ -3578,29 +3506,29 @@ Session::freeze (InterThreadInfo& itt)
 }
 
 int
-Session::write_one_audio_track (AudioTrack& track, jack_nframes_t start, jack_nframes_t len,   
-                              bool overwrite, vector<AudioSource*>& srcs, InterThreadInfo& itt)
+Session::write_one_audio_track (AudioTrack& track, nframes_t start, nframes_t len,     
+                              bool overwrite, vector<boost::shared_ptr<AudioSource> >& srcs, InterThreadInfo& itt)
 {
        int ret = -1;
        Playlist* playlist;
-       AudioFileSource* fsource;
+       boost::shared_ptr<AudioFileSource> fsource;
        uint32_t x;
        char buf[PATH_MAX+1];
        string dir;
        uint32_t nchans;
-       jack_nframes_t position;
-       jack_nframes_t this_chunk;
-       jack_nframes_t to_do;
+       nframes_t position;
+       nframes_t this_chunk;
+       nframes_t to_do;
        vector<Sample*> buffers;
 
        // any bigger than this seems to cause stack overflows in called functions
-       const jack_nframes_t chunk_size = (128 * 1024)/4;
+       const nframes_t chunk_size = (128 * 1024)/4;
 
        g_atomic_int_set (&processing_prohibited, 1);
        
        /* call tree *MUST* hold route_lock */
        
-       if ((playlist = track.diskstream().playlist()) == 0) {
+       if ((playlist = track.diskstream()->playlist()) == 0) {
                goto out;
        }
 
@@ -3610,7 +3538,7 @@ Session::write_one_audio_track (AudioTrack& track, jack_nframes_t start, jack_nf
                goto out;
        }
 
-       nchans = track.audio_diskstream().n_channels();
+       nchans = track.audio_diskstream()->n_channels();
        
        dir = discover_best_sound_dir ();
 
@@ -3629,11 +3557,7 @@ Session::write_one_audio_track (AudioTrack& track, jack_nframes_t start, jack_nf
                }
                
                try {
-                       fsource =  new SndFileSource (buf, 
-                                                     Config->get_native_file_data_format(),
-                                                     Config->get_native_file_header_format(),
-                                                     frame_rate());
-                                                           
+                       fsource = boost::dynamic_pointer_cast<AudioFileSource> (SourceFactory::createWritable (*this, buf, false, frame_rate()));
                }
                
                catch (failed_constructor& err) {
@@ -3641,7 +3565,7 @@ Session::write_one_audio_track (AudioTrack& track, jack_nframes_t start, jack_nf
                        goto out;
                }
 
-               srcs.push_back(fsource);
+               srcs.push_back (fsource);
        }
 
        /* XXX need to flush all redirects */
@@ -3670,9 +3594,9 @@ Session::write_one_audio_track (AudioTrack& track, jack_nframes_t start, jack_nf
                }
 
                uint32_t n = 0;
-               for (vector<AudioSource*>::iterator src=srcs.begin(); src != srcs.end(); ++src, ++n) {
-                       AudioFileSource* afs = dynamic_cast<AudioFileSource*>(*src);
-
+               for (vector<boost::shared_ptr<AudioSource> >::iterator src=srcs.begin(); src != srcs.end(); ++src, ++n) {
+                       boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(*src);
+                       
                        if (afs) {
                                if (afs->write (buffers[n], this_chunk) != this_chunk) {
                                        goto out;
@@ -3694,8 +3618,9 @@ Session::write_one_audio_track (AudioTrack& track, jack_nframes_t start, jack_nf
                time (&now);
                xnow = localtime (&now);
                
-               for (vector<AudioSource*>::iterator src=srcs.begin(); src != srcs.end(); ++src) {
-                       AudioFileSource* afs = dynamic_cast<AudioFileSource*>(*src);
+               for (vector<boost::shared_ptr<AudioSource> >::iterator src=srcs.begin(); src != srcs.end(); ++src) {
+                       boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(*src);
+
                        if (afs) {
                                afs->update_header (position, *xnow, now);
                        }
@@ -3703,8 +3628,8 @@ Session::write_one_audio_track (AudioTrack& track, jack_nframes_t start, jack_nf
                
                /* build peakfile for new source */
                
-               for (vector<AudioSource*>::iterator src=srcs.begin(); src != srcs.end(); ++src) {
-                       AudioFileSource* afs = dynamic_cast<AudioFileSource*>(*src);
+               for (vector<boost::shared_ptr<AudioSource> >::iterator src=srcs.begin(); src != srcs.end(); ++src) {
+                       boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(*src);
                        if (afs) {
                                afs->build_peaks ();
                        }
@@ -3715,12 +3640,14 @@ Session::write_one_audio_track (AudioTrack& track, jack_nframes_t start, jack_nf
                
   out:
        if (ret) {
-               for (vector<AudioSource*>::iterator src=srcs.begin(); src != srcs.end(); ++src) {
-                       AudioFileSource* afs = dynamic_cast<AudioFileSource*>(*src);
+               for (vector<boost::shared_ptr<AudioSource> >::iterator src = srcs.begin(); src != srcs.end(); ++src) {
+                       boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(*src);
+
                        if (afs) {
                                afs->mark_for_remove ();
                        }
-                       delete *src;
+
+                       (*src)->drop_references ();
                }
        }
 
@@ -3775,22 +3702,13 @@ Session::nbusses () const
 }
 
 void
-Session::set_layer_model (LayerModel lm)
+Session::add_curve(Curve *curve)
 {
-       if (lm != layer_model) {
-               layer_model = lm;
-               set_dirty ();
-               ControlChanged (LayeringModel);
-       }
+    curves[curve->id()] = curve;
 }
 
 void
-Session::set_xfade_model (CrossfadeModel xm)
+Session::add_automation_list(AutomationList *al)
 {
-       if (xm != xfade_model) {
-               xfade_model = xm;
-               set_dirty ();
-               ControlChanged (CrossfadingModel);
-       }
+    automation_lists[al->id()] = al;
 }
-