2 Copyright (C) 2000 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #ifndef __ardour_session_h__
21 #define __ardour_session_h__
30 #include <boost/scoped_ptr.hpp>
31 #include <boost/weak_ptr.hpp>
32 #include <boost/dynamic_bitset.hpp>
38 #include <glibmm/thread.h>
40 #include <pbd/error.h>
44 #include <pbd/statefuldestructible.h>
46 #include <midi++/types.h>
47 #include <midi++/mmc.h>
49 #include <pbd/stateful.h>
50 #include <pbd/destructible.h>
52 #include <ardour/ardour.h>
53 #include <ardour/configuration.h>
54 #include <ardour/location.h>
55 #include <ardour/gain.h>
56 #include <ardour/io.h>
58 #include <ardour/smpte.h>
85 class AudioDiskstream;
87 class AudioFileSource;
104 class ControlProtocolInfo;
110 class SessionDirectory;
111 class SessionMetadata;
122 class Session : public PBD::StatefulDestructible
125 typedef std::pair<boost::weak_ptr<Route>,bool> RouteBooleanState;
126 typedef vector<RouteBooleanState> GlobalRouteBooleanState;
127 typedef std::pair<boost::weak_ptr<Route>,MeterPoint> RouteMeterState;
128 typedef vector<RouteMeterState> GlobalRouteMeterState;
152 InputConfigurationChange,
156 /* only one of each of these events
157 can be queued at any one time
173 nframes_t action_frame;
174 nframes_t target_frame;
180 nframes_t target2_frame;
185 boost::shared_ptr<Region> region;
187 list<AudioRange> audio_range;
188 list<MusicRange> music_range;
190 Event(Type t, Action a, nframes_t when, nframes_t where, float spd, bool yn = false)
194 target_frame (where),
198 void set_ptr (void* p) {
202 bool before (const Event& other) const {
203 return action_frame < other.action_frame;
206 bool after (const Event& other) const {
207 return action_frame > other.action_frame;
210 static bool compare (const Event *e1, const Event *e2) {
211 return e1->before (*e2);
214 void *operator new (size_t ignored) {
215 return pool.alloc ();
218 void operator delete(void *ptr, size_t size) {
222 static const nframes_t Immediate = 0;
225 static MultiAllocSingleReleasePool pool;
228 /* creating from an XML file */
230 Session (AudioEngine&,
231 const string& fullpath,
232 const string& snapshot_name,
233 string mix_template = "");
235 /* creating a new Session */
237 Session (AudioEngine&,
239 string snapshot_name,
240 AutoConnectOption input_auto_connect,
241 AutoConnectOption output_auto_connect,
242 uint32_t control_out_channels,
243 uint32_t master_out_channels,
244 uint32_t n_physical_in,
245 uint32_t n_physical_out,
246 nframes_t initial_length);
250 string path() const { return _path; }
251 string name() const { return _name; }
252 string snap_name() const { return _current_snapshot_name; }
253 string raid_path () const;
255 void set_snap_name ();
259 bool dirty() const { return _state_of_the_state & Dirty; }
260 void set_deletion_in_progress ();
261 bool deletion_in_progress() const { return _state_of_the_state & Deletion; }
262 sigc::signal<void> DirtyChanged;
264 const SessionDirectory& session_directory () const { return *(_session_dir.get()); }
266 static sigc::signal<void> AutoBindingOn;
267 static sigc::signal<void> AutoBindingOff;
269 static sigc::signal<void,std::string> Dialog;
271 std::string sound_dir (bool with_path = true) const;
272 std::string peak_dir () const;
273 std::string dead_sound_dir () const;
274 std::string automation_dir () const;
275 std::string analysis_dir() const;
277 int ensure_subdirs ();
279 Glib::ustring peak_path (Glib::ustring) const;
281 static string change_audio_path_by_name (string oldpath, string oldname, string newname, bool destructive);
282 static string change_midi_path_by_name (string oldpath, string oldname, string newname, bool destructive);
284 string peak_path_from_audio_path (string) const;
285 string audio_path_from_name (string, uint32_t nchans, uint32_t chan, bool destructive);
286 string midi_path_from_name (string);
288 void process (nframes_t nframes);
290 BufferSet& get_silent_buffers (ChanCount count = ChanCount::ZERO);
291 BufferSet& get_scratch_buffers (ChanCount count = ChanCount::ZERO);
292 BufferSet& get_mix_buffers (ChanCount count = ChanCount::ZERO);
294 void add_diskstream (boost::shared_ptr<Diskstream>);
295 boost::shared_ptr<Diskstream> diskstream_by_id (const PBD::ID& id);
296 boost::shared_ptr<Diskstream> diskstream_by_name (string name);
298 bool have_captured() const { return _have_captured; }
300 void refill_all_diskstream_buffers ();
301 uint32_t audio_diskstream_buffer_size() const { return audio_dstream_buffer_size; }
302 uint32_t midi_diskstream_buffer_size() const { return midi_dstream_buffer_size; }
304 uint32_t get_next_diskstream_id() const { return n_diskstreams(); }
305 uint32_t n_diskstreams() const;
307 typedef std::list<boost::shared_ptr<Diskstream> > DiskstreamList;
308 typedef std::list<boost::shared_ptr<Route> > RouteList;
310 boost::shared_ptr<RouteList> get_routes() const {
311 return routes.reader ();
314 uint32_t nroutes() const { return routes.reader()->size(); }
315 uint32_t ntracks () const;
316 uint32_t nbusses () const;
318 struct RoutePublicOrderSorter {
319 bool operator() (boost::shared_ptr<Route>, boost::shared_ptr<Route> b);
322 template<class T> void foreach_route (T *obj, void (T::*func)(Route&));
323 template<class T> void foreach_route (T *obj, void (T::*func)(boost::shared_ptr<Route>));
324 template<class T, class A> void foreach_route (T *obj, void (T::*func)(Route&, A), A arg);
326 boost::shared_ptr<Route> route_by_name (string);
327 boost::shared_ptr<Route> route_by_id (PBD::ID);
328 boost::shared_ptr<Route> route_by_remote_id (uint32_t id);
330 bool route_name_unique (string) const;
332 bool get_record_enabled() const {
333 return (record_status () >= Enabled);
336 RecordState record_status() const {
337 return (RecordState) g_atomic_int_get (&_record_status);
340 bool actively_recording () {
341 return record_status() == Recording;
344 bool record_enabling_legal () const;
345 void maybe_enable_record ();
346 void disable_record (bool rt_context, bool force = false);
347 void step_back_from_record ();
349 void maybe_write_autosave ();
351 /* Proxy signal for region hidden changes */
353 sigc::signal<void,boost::shared_ptr<Region> > RegionHiddenChange;
355 /* Emitted when all i/o connections are complete */
357 sigc::signal<void> IOConnectionsComplete;
359 /* Record status signals */
361 sigc::signal<void> RecordStateChanged;
363 /* Transport mechanism signals */
365 sigc::signal<void> TransportStateChange; /* generic */
366 sigc::signal<void,nframes_t> PositionChanged; /* sent after any non-sequential motion */
367 sigc::signal<void> DurationChanged;
368 sigc::signal<void,nframes_t> Xrun;
369 sigc::signal<void> TransportLooped;
371 sigc::signal<void,RouteList&> RouteAdded;
373 void request_roll_at_and_return (nframes_t start, nframes_t return_to);
374 void request_bounded_roll (nframes_t start, nframes_t end);
375 void request_stop (bool abort = false);
376 void request_locate (nframes_t frame, bool with_roll = false);
378 void request_play_loop (bool yn);
379 bool get_play_loop () const { return play_loop; }
381 nframes_t last_transport_start() const { return _last_roll_location; }
382 void goto_end () { request_locate (end_location->start(), false);}
383 void goto_start () { request_locate (start_location->start(), false); }
384 void set_session_start (nframes_t start) { start_location->set_start(start); }
385 void set_session_end (nframes_t end) { end_location->set_start(end); _end_location_is_free = false; }
386 void use_rf_shuttle_speed ();
387 void allow_auto_play (bool yn);
388 void request_transport_speed (float speed);
389 void request_overwrite_buffer (Diskstream*);
390 void request_diskstream_speed (Diskstream&, float speed);
391 void request_input_change_handling ();
393 bool locate_pending() const { return static_cast<bool>(post_transport_work&PostTransportLocate); }
394 bool transport_locked () const;
397 //int wipe_diskstream (AudioDiskstream *);
399 int remove_region_from_region_list (boost::shared_ptr<Region>);
401 nframes_t get_maximum_extent () const;
402 nframes_t current_end_frame() const { return end_location->start(); }
403 nframes_t current_start_frame() const { return start_location->start(); }
404 // "actual" sample rate of session, set by current audioengine rate, pullup/down etc.
405 nframes_t frame_rate() const { return _current_frame_rate; }
406 // "native" sample rate of session, regardless of current audioengine rate, pullup/down etc
407 nframes_t nominal_frame_rate() const { return _nominal_frame_rate; }
408 nframes_t frames_per_hour() const { return _frames_per_hour; }
410 double frames_per_smpte_frame() const { return _frames_per_smpte_frame; }
411 nframes_t smpte_frames_per_hour() const { return _smpte_frames_per_hour; }
413 float smpte_frames_per_second() const;
414 bool smpte_drop_frames() const;
418 Locations *locations() { return &_locations; }
420 sigc::signal<void,Location*> auto_loop_location_changed;
421 sigc::signal<void,Location*> auto_punch_location_changed;
422 sigc::signal<void> locations_modified;
424 void set_auto_punch_location (Location *);
425 void set_auto_loop_location (Location *);
426 int location_name(string& result, string base = string(""));
428 void reset_input_monitor_state ();
430 void add_event (nframes_t action_frame, Event::Type type, nframes_t target_frame = 0);
431 void remove_event (nframes_t frame, Event::Type type);
432 void clear_events (Event::Type type);
434 nframes_t get_block_size() const { return current_block_size; }
435 nframes_t worst_output_latency () const { return _worst_output_latency; }
436 nframes_t worst_input_latency () const { return _worst_input_latency; }
437 nframes_t worst_track_latency () const { return _worst_track_latency; }
439 int save_state (std::string snapshot_name, bool pending = false);
440 int restore_state (std::string snapshot_name);
441 int save_template (std::string template_name);
442 int save_history (std::string snapshot_name = "");
443 int restore_history (std::string snapshot_name);
444 void remove_state (std::string snapshot_name);
445 void rename_state (std::string old_name, std::string new_name);
446 void remove_pending_capture_state ();
448 static int rename_template (std::string old_name, std::string new_name);
449 static int delete_template (std::string name);
451 sigc::signal<void,string> StateSaved;
452 sigc::signal<void> StateReady;
454 vector<string*>* possible_states() const;
455 static vector<string*>* possible_states(string path);
457 XMLNode& get_state();
458 int set_state(const XMLNode& node); // not idempotent
459 XMLNode& get_template();
461 /// The instant xml file is written to the session directory
462 void add_instant_xml (XMLNode&, bool write_to_config = true);
463 XMLNode * instant_xml (const std::string& str);
465 enum StateOfTheState {
470 InitialConnecting = 0x8,
475 StateOfTheState state_of_the_state() const { return _state_of_the_state; }
477 RouteGroup* add_edit_group (string);
478 RouteGroup* add_mix_group (string);
480 void remove_edit_group (RouteGroup&);
481 void remove_mix_group (RouteGroup&);
483 RouteGroup *mix_group_by_name (string);
484 RouteGroup *edit_group_by_name (string);
486 sigc::signal<void,RouteGroup*> edit_group_added;
487 sigc::signal<void,RouteGroup*> mix_group_added;
488 sigc::signal<void> edit_group_removed;
489 sigc::signal<void> mix_group_removed;
491 void foreach_edit_group (sigc::slot<void,RouteGroup*> sl) {
492 for (list<RouteGroup *>::iterator i = edit_groups.begin(); i != edit_groups.end(); i++) {
497 void foreach_mix_group (sigc::slot<void,RouteGroup*> sl) {
498 for (list<RouteGroup *>::iterator i = mix_groups.begin(); i != mix_groups.end(); i++) {
503 /* fundamental operations. duh. */
505 std::list<boost::shared_ptr<AudioTrack> > new_audio_track (int input_channels, int output_channels, TrackMode mode = Normal, uint32_t how_many = 1);
506 RouteList new_audio_route (int input_channels, int output_channels, uint32_t how_many);
508 std::list<boost::shared_ptr<MidiTrack> > new_midi_track (TrackMode mode = Normal, uint32_t how_many = 1);
509 //boost::shared_ptr<Route> new_midi_route (uint32_t how_many = 1);
511 void remove_route (boost::shared_ptr<Route>);
512 void resort_routes ();
513 void resort_routes_using (boost::shared_ptr<RouteList>);
515 void set_remote_control_ids();
517 AudioEngine & engine() { return _engine; }
518 AudioEngine const & engine () const { return _engine; }
525 nframes_t transport_frame () const {return _transport_frame; }
526 nframes_t audible_frame () const;
527 nframes64_t requested_return_frame() const { return _requested_return_frame; }
541 int set_smpte_format (SmpteFormat);
542 void sync_time_vars();
544 void bbt_time (nframes_t when, BBT_Time&);
545 void smpte_to_sample( SMPTE::Time& smpte, nframes_t& sample, bool use_offset, bool use_subframes ) const;
546 void sample_to_smpte( nframes_t sample, SMPTE::Time& smpte, bool use_offset, bool use_subframes ) const;
547 void smpte_time (SMPTE::Time &);
548 void smpte_time (nframes_t when, SMPTE::Time&);
549 void smpte_time_subframes (nframes_t when, SMPTE::Time&);
551 void smpte_duration (nframes_t, SMPTE::Time&) const;
552 void smpte_duration_string (char *, nframes_t) const;
554 void set_smpte_offset (nframes_t);
555 nframes_t smpte_offset () const { return _smpte_offset; }
556 void set_smpte_offset_negative (bool);
557 bool smpte_offset_negative () const { return _smpte_offset_negative; }
559 nframes_t convert_to_frames_at (nframes_t position, AnyTime const &);
561 static sigc::signal<void> StartTimeChanged;
562 static sigc::signal<void> EndTimeChanged;
563 static sigc::signal<void> SMPTEOffsetChanged;
565 void request_slave_source (SlaveSource);
566 bool synced_to_jack() const { return Config->get_slave_source() == JACK; }
568 float transport_speed() const { return _transport_speed; }
569 bool transport_stopped() const { return _transport_speed == 0.0f; }
570 bool transport_rolling() const { return _transport_speed != 0.0f; }
572 void set_silent (bool yn);
573 bool silent () { return _silent; }
575 int jack_slave_sync (nframes_t);
577 TempoMap& tempo_map() { return *_tempo_map; }
581 void add_regions (std::vector<boost::shared_ptr<Region> >&);
583 sigc::signal<void,boost::weak_ptr<Region> > RegionAdded;
584 sigc::signal<void,std::vector<boost::weak_ptr<Region> >& > RegionsAdded;
585 sigc::signal<void,boost::weak_ptr<Region> > RegionRemoved;
587 int region_name (string& result, string base = string(""), bool newlevel = false);
588 string new_region_name (string);
589 string path_from_region_name (DataType type, string name, string identifier);
591 boost::shared_ptr<Region> find_whole_file_parent (boost::shared_ptr<Region const>);
593 void find_equivalent_playlist_regions (boost::shared_ptr<Region>, std::vector<boost::shared_ptr<Region> >& result);
595 boost::shared_ptr<Region> XMLRegionFactory (const XMLNode&, bool full);
596 boost::shared_ptr<AudioRegion> XMLAudioRegionFactory (const XMLNode&, bool full);
597 boost::shared_ptr<MidiRegion> XMLMidiRegionFactory (const XMLNode&, bool full);
599 template<class T> void foreach_region (T *obj, void (T::*func)(boost::shared_ptr<Region>));
601 /* source management */
603 struct import_status : public InterThreadInfo {
608 volatile bool freeze;
609 std::vector<Glib::ustring> paths;
610 bool replace_existing_source;
617 void import_audiofiles (import_status&);
618 bool sample_rate_convert (import_status&, string infile, string& outfile);
619 string build_tmp_convert_name (string file);
621 boost::shared_ptr<ExportHandler> get_export_handler ();
622 boost::shared_ptr<ExportStatus> get_export_status ();
624 int start_audio_export (nframes_t position, bool realtime);
626 sigc::signal<int, nframes_t> ProcessExport;
627 sigc::signal<void> ExportReadFinished;
628 static sigc::signal<void, std::string, std::string> Exported;
630 void add_source (boost::shared_ptr<Source>);
631 void remove_source (boost::weak_ptr<Source>);
633 struct cleanup_report {
634 vector<string> paths;
638 int cleanup_sources (cleanup_report&);
639 int cleanup_trash_sources (cleanup_report&);
641 int destroy_region (boost::shared_ptr<Region>);
642 int destroy_regions (std::list<boost::shared_ptr<Region> >);
644 int remove_last_capture ();
646 /* handlers should return -1 for "stop cleanup", 0 for
647 "yes, delete this playlist" and 1 for "no, don't delete
651 sigc::signal<int,boost::shared_ptr<ARDOUR::Playlist> > AskAboutPlaylistDeletion;
653 /* handlers should return 0 for "ignore the rate mismatch"
654 and !0 for "do not use this session"
657 static sigc::signal<int,nframes_t, nframes_t> AskAboutSampleRateMismatch;
659 /* handlers should return !0 for use pending state, 0 for
663 static sigc::signal<int> AskAboutPendingState;
665 boost::shared_ptr<AudioFileSource> create_audio_source_for_session (ARDOUR::AudioDiskstream&, uint32_t which_channel, bool destructive);
667 boost::shared_ptr<MidiSource> create_midi_source_for_session (ARDOUR::MidiDiskstream&);
669 boost::shared_ptr<Source> source_by_id (const PBD::ID&);
670 boost::shared_ptr<Source> source_by_path_and_channel (const Glib::ustring&, uint16_t);
672 /* playlist management */
674 boost::shared_ptr<Playlist> playlist_by_name (string name);
675 void unassigned_playlists (std::list<boost::shared_ptr<Playlist> > & list);
676 void add_playlist (boost::shared_ptr<Playlist>, bool unused = false);
677 sigc::signal<void,boost::shared_ptr<Playlist> > PlaylistAdded;
678 sigc::signal<void,boost::shared_ptr<Playlist> > PlaylistRemoved;
680 uint32_t n_playlists() const;
682 template<class T> void foreach_playlist (T *obj, void (T::*func)(boost::shared_ptr<Playlist>));
683 void get_playlists (std::vector<boost::shared_ptr<Playlist> >&);
685 /* named selections */
687 NamedSelection* named_selection_by_name (string name);
688 void add_named_selection (NamedSelection *);
689 void remove_named_selection (NamedSelection *);
691 template<class T> void foreach_named_selection (T& obj, void (T::*func)(NamedSelection&));
692 sigc::signal<void> NamedSelectionAdded;
693 sigc::signal<void> NamedSelectionRemoved;
695 /* Curves and AutomationLists (TODO when they go away) */
696 void add_curve(Evoral::Curve*);
697 void add_automation_list(AutomationList*);
701 float get_default_fade_length () const { return default_fade_msecs; }
702 float get_default_fade_steepness () const { return default_fade_steepness; }
703 void set_default_fade (float steepness, float msecs);
707 boost::shared_ptr<Auditioner> the_auditioner() { return auditioner; }
708 void audition_playlist ();
709 void audition_region (boost::shared_ptr<Region>);
710 void cancel_audition ();
711 bool is_auditioning () const;
713 sigc::signal<void,bool> AuditionActive;
715 /* flattening stuff */
717 boost::shared_ptr<Region> write_one_track (AudioTrack&, nframes_t start, nframes_t end, bool overwrite, vector<boost::shared_ptr<Source> >&,
718 InterThreadInfo& wot);
719 int freeze (InterThreadInfo&);
721 /* session-wide solo/mute/rec-enable */
723 bool soloing() const { return currently_soloing; }
725 void set_all_solo (bool);
726 void set_all_mute (bool);
728 sigc::signal<void,bool> SoloActive;
729 sigc::signal<void> SoloChanged;
731 void record_disenable_all ();
732 void record_enable_all ();
734 /* control/master out */
736 boost::shared_ptr<IO> control_out() const { return _control_out; }
737 boost::shared_ptr<IO> master_out() const { return _master_out; }
739 /* insert/send management */
741 uint32_t n_port_inserts() const { return _port_inserts.size(); }
742 uint32_t n_plugin_inserts() const { return _plugin_inserts.size(); }
743 uint32_t n_sends() const { return _sends.size(); }
745 static void set_disable_all_loaded_plugins (bool yn) {
746 _disable_all_loaded_plugins = yn;
748 static bool get_disable_all_loaded_plugins() {
749 return _disable_all_loaded_plugins;
752 uint32_t next_send_id();
753 uint32_t next_insert_id();
754 void mark_send_id (uint32_t);
755 void mark_insert_id (uint32_t);
757 /* s/w "RAID" management */
759 nframes_t available_capture_duration();
763 void foreach_bundle (sigc::slot<void, boost::shared_ptr<Bundle> >);
764 void add_bundle (boost::shared_ptr<Bundle>);
765 void remove_bundle (boost::shared_ptr<Bundle>);
766 boost::shared_ptr<Bundle> bundle_by_name (string) const;
768 sigc::signal<void,boost::shared_ptr<Bundle> > BundleAdded;
769 sigc::signal<void,boost::shared_ptr<Bundle> > BundleRemoved;
773 void midi_panic(void);
774 int set_mtc_port (string port_tag);
775 int set_mmc_port (string port_tag);
776 int set_midi_port (string port_tag);
777 int set_midi_clock_port (string port_tag);
778 MIDI::Port *mtc_port() const { return _mtc_port; }
779 MIDI::Port *mmc_port() const { return _mmc_port; }
780 MIDI::Port *midi_port() const { return _midi_port; }
781 MIDI::Port *midi_clock_port() const { return _midi_clock_port; }
783 sigc::signal<void> MTC_PortChanged;
784 sigc::signal<void> MMC_PortChanged;
785 sigc::signal<void> MIDI_PortChanged;
786 sigc::signal<void> MIDIClock_PortChanged;
788 void set_trace_midi_input (bool, MIDI::Port* port = 0);
789 void set_trace_midi_output (bool, MIDI::Port* port = 0);
791 bool get_trace_midi_input(MIDI::Port *port = 0);
792 bool get_trace_midi_output(MIDI::Port *port = 0);
794 void set_mmc_receive_device_id (uint32_t id);
795 void set_mmc_send_device_id (uint32_t id);
799 void start_scrub (nframes_t where);
801 void set_scrub_speed (float);
802 nframes_t scrub_buffer_size() const;
803 sigc::signal<void> ScrubReady;
805 /* History (for editors, mixers, UIs etc.) */
807 /** Undo some transactions.
808 * @param n Number of transactions to undo.
810 void undo (uint32_t n) {
814 void redo (uint32_t n) {
818 UndoHistory& history() { return _history; }
820 uint32_t undo_depth() const { return _history.undo_depth(); }
821 uint32_t redo_depth() const { return _history.redo_depth(); }
822 string next_undo() const { return _history.next_undo(); }
823 string next_redo() const { return _history.next_redo(); }
825 void begin_reversible_command (const string& cmd_name);
826 void commit_reversible_command (Command* cmd = 0);
828 void add_command (Command *const cmd) {
829 current_trans->add_command (cmd);
832 std::map<PBD::ID, PBD::StatefulThingWithGoingAway*> registry;
834 // these commands are implemented in libs/ardour/session_command.cc
835 Command* memento_command_factory(XMLNode* n);
836 void register_with_memento_command_factory(PBD::ID, PBD::StatefulThingWithGoingAway*);
838 Command* global_state_command_factory (const XMLNode& n);
840 class GlobalRouteStateCommand : public Command
843 GlobalRouteStateCommand (Session&, void*);
844 GlobalRouteStateCommand (Session&, const XMLNode& node);
845 int set_state (const XMLNode&);
846 XMLNode& get_state ();
849 GlobalRouteBooleanState before, after;
855 class GlobalSoloStateCommand : public GlobalRouteStateCommand
858 GlobalSoloStateCommand (Session &, void *src);
859 GlobalSoloStateCommand (Session&, const XMLNode&);
860 void operator()(); //redo
862 XMLNode &get_state();
866 class GlobalMuteStateCommand : public GlobalRouteStateCommand
869 GlobalMuteStateCommand(Session &, void *src);
870 GlobalMuteStateCommand (Session&, const XMLNode&);
871 void operator()(); // redo
873 XMLNode &get_state();
877 class GlobalRecordEnableStateCommand : public GlobalRouteStateCommand
880 GlobalRecordEnableStateCommand(Session &, void *src);
881 GlobalRecordEnableStateCommand (Session&, const XMLNode&);
882 void operator()(); // redo
884 XMLNode &get_state();
888 class GlobalMeteringStateCommand : public Command
891 GlobalMeteringStateCommand(Session &, void *src);
892 GlobalMeteringStateCommand (Session&, const XMLNode&);
895 XMLNode &get_state();
896 int set_state (const XMLNode&);
902 GlobalRouteMeterState before;
903 GlobalRouteMeterState after;
908 boost::shared_ptr<IO> click_io() { return _click_io; }
910 /* disk, buffer loads */
912 uint32_t playback_load ();
913 uint32_t capture_load ();
914 uint32_t playback_load_min ();
915 uint32_t capture_load_min ();
917 void reset_playback_load_min ();
918 void reset_capture_load_min ();
920 float read_data_rate () const; // in usec
921 float write_data_rate () const;
925 void set_audio_range (list<AudioRange>&);
926 void set_music_range (list<MusicRange>&);
928 void request_play_range (bool yn);
929 bool get_play_range () const { return _play_range; }
931 /* buffers for gain and pan */
933 gain_t* gain_automation_buffer () const { return _gain_automation_buffer; }
934 pan_t** pan_automation_buffer () const { return _pan_automation_buffer; }
936 /* buffers for conversion */
945 static long vst_callback (AEffect* effect,
952 static sigc::signal<void> SendFeedback;
956 boost::shared_ptr<PBD::Controllable> controllable_by_id (const PBD::ID&);
958 void add_controllable (boost::shared_ptr<PBD::Controllable>);
959 void remove_controllable (PBD::Controllable*);
962 friend class AudioEngine;
963 void set_block_size (nframes_t nframes);
964 void set_frame_rate (nframes_t nframes);
967 friend class Diskstream;
969 void wait_till_butler_finished();
973 void schedule_curve_reallocation ();
974 void update_latency_compensation (bool, bool);
977 int create (bool& new_session, const string& mix_template, nframes_t initial_length);
980 nframes_t compute_initial_length ();
983 PendingDeclickIn = 0x1,
984 PendingDeclickOut = 0x2,
985 StopPendingCapture = 0x4,
986 AutoReturning = 0x10,
987 PendingLocate = 0x20,
988 PendingSetLoop = 0x40
991 /* stuff used in process() should be close together to
995 typedef void (Session::*process_function_type)(nframes_t);
997 AudioEngine& _engine;
998 mutable gint processing_prohibited;
999 process_function_type process_function;
1000 process_function_type last_process_function;
1001 bool waiting_for_sync_offset;
1002 nframes_t _base_frame_rate;
1003 nframes_t _current_frame_rate; //this includes video pullup offset
1004 nframes_t _nominal_frame_rate; //ignores audioengine setting, "native" SR
1005 int transport_sub_state;
1006 mutable gint _record_status;
1007 volatile nframes_t _transport_frame;
1008 Location* end_location;
1009 Location* start_location;
1012 volatile float _transport_speed;
1013 volatile float _desired_transport_speed;
1014 float _last_transport_speed;
1015 bool auto_play_legal;
1016 nframes_t _last_slave_transport_frame;
1017 nframes_t maximum_output_latency;
1018 nframes_t last_stop_frame;
1019 volatile nframes64_t _requested_return_frame;
1020 BufferSet* _scratch_buffers;
1021 BufferSet* _silent_buffers;
1022 BufferSet* _mix_buffers;
1023 nframes_t current_block_size;
1024 nframes_t _worst_output_latency;
1025 nframes_t _worst_input_latency;
1026 nframes_t _worst_track_latency;
1027 bool _have_captured;
1029 float _meter_falloff;
1030 bool _end_location_is_free;
1032 void set_worst_io_latencies ();
1033 void set_worst_io_latencies_x (IOChange asifwecare, void *ignored) {
1034 set_worst_io_latencies ();
1037 void update_latency_compensation_proxy (void* ignored);
1039 void ensure_buffers (ChanCount howmany);
1041 void process_scrub (nframes_t);
1042 void process_without_events (nframes_t);
1043 void process_with_events (nframes_t);
1044 void process_audition (nframes_t);
1045 void process_export (nframes_t);
1046 int process_export_fw (nframes_t);
1048 /* slave tracking */
1050 static const int delta_accumulator_size = 25;
1051 int delta_accumulator_cnt;
1052 long delta_accumulator[delta_accumulator_size];
1053 long average_slave_delta;
1055 bool have_first_delta_accumulator;
1063 SlaveState slave_state;
1064 nframes_t slave_wait_end;
1066 void reset_slave_state ();
1067 bool follow_slave (nframes_t, nframes_t);
1068 void set_slave_source (SlaveSource);
1070 SlaveSource post_export_slave;
1071 nframes_t post_export_position;
1074 bool _exporting_realtime;
1076 boost::shared_ptr<ExportHandler> export_handler;
1077 boost::shared_ptr<ExportStatus> export_status;
1080 int stop_audio_export ();
1081 void finalize_audio_export ();
1083 sigc::connection export_freewheel_connection;
1084 sigc::connection export_abort_connection;
1086 void prepare_diskstreams ();
1087 void commit_diskstreams (nframes_t, bool& session_requires_butler);
1088 int process_routes (nframes_t, nframes_t);
1089 int silent_process_routes (nframes_t, nframes_t);
1091 bool get_rec_monitors_input () {
1092 if (actively_recording()) {
1095 if (Config->get_auto_input()) {
1103 int get_transport_declick_required () {
1105 if (transport_sub_state & PendingDeclickIn) {
1106 transport_sub_state &= ~PendingDeclickIn;
1108 } else if (transport_sub_state & PendingDeclickOut) {
1115 bool maybe_stop (nframes_t limit) {
1116 if ((_transport_speed > 0.0f && _transport_frame >= limit) || (_transport_speed < 0.0f && _transport_frame == 0)) {
1123 bool maybe_sync_start (nframes_t&, nframes_t&);
1125 void check_declick_out ();
1127 MIDI::MachineControl* mmc;
1128 MIDI::Port* _mmc_port;
1129 MIDI::Port* _mtc_port;
1130 MIDI::Port* _midi_port;
1131 MIDI::Port* _midi_clock_port;
1134 bool session_send_mmc;
1135 bool session_send_mtc;
1136 bool session_midi_feedback;
1139 nframes_t last_loopend;
1141 boost::scoped_ptr<SessionDirectory> _session_dir;
1143 RingBuffer<Event*> pending_events;
1146 void when_engine_running ();
1147 void graph_reordered ();
1149 string _current_snapshot_name;
1151 XMLTree* state_tree;
1152 bool state_was_pending;
1153 StateOfTheState _state_of_the_state;
1156 int load_options (const XMLNode&);
1157 XMLNode& get_options () const;
1158 int load_state (string snapshot_name);
1159 bool save_config_options_predicate (ConfigVariableBase::Owner owner) const;
1161 nframes_t _last_roll_location;
1162 nframes_t _last_record_location;
1164 bool pending_locate_roll;
1165 nframes_t pending_locate_frame;
1166 bool pending_locate_flush;
1168 bool pending_auto_loop;
1170 Sample* butler_mixdown_buffer;
1171 float* butler_gain_buffer;
1172 pthread_t butler_thread;
1173 Glib::Mutex butler_request_lock;
1174 Glib::Cond butler_paused;
1175 bool butler_should_run;
1176 mutable gint butler_should_do_transport_work;
1177 int butler_request_pipe[2];
1179 inline bool transport_work_requested() const { return g_atomic_int_get(&butler_should_do_transport_work); }
1181 struct ButlerRequest {
1190 enum PostTransportWork {
1191 PostTransportStop = 0x1,
1192 PostTransportDisableRecord = 0x2,
1193 PostTransportPosition = 0x8,
1194 PostTransportDidRecord = 0x20,
1195 PostTransportDuration = 0x40,
1196 PostTransportLocate = 0x80,
1197 PostTransportRoll = 0x200,
1198 PostTransportAbort = 0x800,
1199 PostTransportOverWrite = 0x1000,
1200 PostTransportSpeed = 0x2000,
1201 PostTransportAudition = 0x4000,
1202 PostTransportScrub = 0x8000,
1203 PostTransportReverse = 0x10000,
1204 PostTransportInputChange = 0x20000,
1205 PostTransportCurveRealloc = 0x40000
1208 static const PostTransportWork ProcessCannotProceedMask =
1209 PostTransportWork (PostTransportInputChange|
1211 PostTransportReverse|
1212 PostTransportCurveRealloc|
1214 PostTransportAudition|
1215 PostTransportLocate|
1218 PostTransportWork post_transport_work;
1220 void summon_butler ();
1221 void schedule_butler_transport_work ();
1222 int start_butler_thread ();
1223 void terminate_butler_thread ();
1224 static void *_butler_thread_work (void *arg);
1225 void* butler_thread_work ();
1227 uint32_t cumulative_rf_motion;
1230 void set_rf_speed (float speed);
1231 void reset_rf_scale (nframes_t frames_moved);
1233 Locations _locations;
1234 void locations_changed ();
1235 void locations_added (Location*);
1236 void handle_locations_changed (Locations::LocationList&);
1238 sigc::connection auto_punch_start_changed_connection;
1239 sigc::connection auto_punch_end_changed_connection;
1240 sigc::connection auto_punch_changed_connection;
1241 void auto_punch_start_changed (Location *);
1242 void auto_punch_end_changed (Location *);
1243 void auto_punch_changed (Location *);
1245 sigc::connection auto_loop_start_changed_connection;
1246 sigc::connection auto_loop_end_changed_connection;
1247 sigc::connection auto_loop_changed_connection;
1248 void auto_loop_changed (Location *);
1250 typedef list<Event *> Events;
1252 Events immediate_events;
1253 Events::iterator next_event;
1255 /* there can only ever be one of each of these */
1257 Event *auto_loop_event;
1258 Event *punch_out_event;
1259 Event *punch_in_event;
1263 void dump_events () const;
1264 void queue_event (Event *ev);
1265 void merge_event (Event*);
1266 void replace_event (Event::Type, nframes_t action_frame, nframes_t target = 0);
1267 bool _replace_event (Event*);
1268 bool _remove_event (Event *);
1269 void _clear_event_type (Event::Type);
1271 void first_stage_init (string path, string snapshot_name);
1272 int second_stage_init (bool new_tracks);
1273 void find_current_end ();
1274 void remove_empty_sounds ();
1276 void setup_midi_control ();
1277 int midi_read (MIDI::Port *);
1279 void enable_record ();
1281 void increment_transport_position (uint32_t val) {
1282 if (max_frames - val < _transport_frame) {
1283 _transport_frame = max_frames;
1285 _transport_frame += val;
1289 void decrement_transport_position (uint32_t val) {
1290 if (val < _transport_frame) {
1291 _transport_frame -= val;
1293 _transport_frame = 0;
1297 void post_transport_motion ();
1298 static void *session_loader_thread (void *arg);
1302 void set_next_event ();
1303 void process_event (Event *ev);
1305 /* MIDI Machine Control */
1307 void deliver_mmc (MIDI::MachineControl::Command, nframes_t);
1309 void spp_start (MIDI::Parser&);
1310 void spp_continue (MIDI::Parser&);
1311 void spp_stop (MIDI::Parser&);
1313 void midi_clock_start (MIDI::Parser&);
1314 void midi_clock_continue (MIDI::Parser&);
1315 void midi_clock_stop (MIDI::Parser&);
1317 void mmc_deferred_play (MIDI::MachineControl &);
1318 void mmc_stop (MIDI::MachineControl &);
1319 void mmc_step (MIDI::MachineControl &, int);
1320 void mmc_pause (MIDI::MachineControl &);
1321 void mmc_record_pause (MIDI::MachineControl &);
1322 void mmc_record_strobe (MIDI::MachineControl &);
1323 void mmc_record_exit (MIDI::MachineControl &);
1324 void mmc_track_record_status (MIDI::MachineControl &, uint32_t track, bool enabled);
1325 void mmc_fast_forward (MIDI::MachineControl &);
1326 void mmc_rewind (MIDI::MachineControl &);
1327 void mmc_locate (MIDI::MachineControl &, const MIDI::byte *);
1328 void mmc_shuttle (MIDI::MachineControl &mmc, float speed, bool forw);
1329 void mmc_record_enable (MIDI::MachineControl &mmc, size_t track, bool enabled);
1331 struct timeval last_mmc_step;
1334 typedef sigc::slot<bool> MidiTimeoutCallback;
1335 typedef list<MidiTimeoutCallback> MidiTimeoutList;
1337 MidiTimeoutList midi_timeouts;
1338 bool mmc_step_timeout ();
1340 MIDI::byte mmc_buffer[32];
1341 MIDI::byte mtc_msg[16];
1342 MIDI::byte mtc_smpte_bits; /* encoding of SMTPE type for MTC */
1343 MIDI::byte midi_msg[16];
1344 nframes_t outbound_mtc_smpte_frame;
1345 SMPTE::Time transmitting_smpte_time;
1346 int next_quarter_frame_to_send;
1348 double _frames_per_smpte_frame; /* has to be floating point because of drop frame */
1349 nframes_t _frames_per_hour;
1350 nframes_t _smpte_frames_per_hour;
1351 nframes_t _smpte_offset;
1352 bool _smpte_offset_negative;
1354 /* cache the most-recently requested time conversions. This helps when we
1355 * have multiple clocks showing the same time (e.g. the transport frame) */
1356 bool last_smpte_valid;
1357 nframes_t last_smpte_when;
1358 SMPTE::Time last_smpte;
1360 bool _send_smpte_update; ///< Flag to send a full frame (SMPTE) MTC message this cycle
1362 int send_full_time_code(nframes_t nframes);
1363 int send_midi_time_code_for_cycle(nframes_t nframes);
1365 nframes_t adjust_apparent_position (nframes_t frames);
1367 void reset_record_status ();
1369 int no_roll (nframes_t nframes, nframes_t offset);
1371 bool non_realtime_work_pending() const { return static_cast<bool>(post_transport_work); }
1372 bool process_can_proceed() const { return !(post_transport_work & ProcessCannotProceedMask); }
1374 struct MIDIRequest {
1386 Glib::Mutex midi_lock;
1387 pthread_t midi_thread;
1388 int midi_request_pipe[2];
1389 RingBuffer<MIDIRequest*> midi_requests;
1391 int start_midi_thread ();
1392 void terminate_midi_thread ();
1393 void poke_midi_thread ();
1394 static void *_midi_thread_work (void *arg);
1395 void midi_thread_work ();
1396 void change_midi_ports ();
1397 int use_config_midi_ports ();
1399 mutable gint butler_active;
1401 void set_play_loop (bool yn);
1402 void overwrite_some_buffers (Diskstream*);
1403 void flush_all_inserts ();
1404 int micro_locate (nframes_t distance);
1405 void locate (nframes_t, bool with_roll, bool with_flush, bool with_loop=false);
1406 void start_locate (nframes_t, bool with_roll, bool with_flush, bool with_loop=false);
1407 void force_locate (nframes_t frame, bool with_roll = false);
1408 void set_diskstream_speed (Diskstream*, float speed);
1409 void set_transport_speed (float speed, bool abort = false);
1410 void stop_transport (bool abort = false);
1411 void start_transport ();
1412 void realtime_stop (bool abort);
1413 void non_realtime_start_scrub ();
1414 void non_realtime_set_speed ();
1415 void non_realtime_locate ();
1416 void non_realtime_stop (bool abort, int entry_request_count, bool& finished);
1417 void non_realtime_overwrite (int entry_request_count, bool& finished);
1418 void butler_transport_work ();
1419 void post_transport ();
1420 void engine_halted ();
1421 void xrun_recovery ();
1423 TempoMap *_tempo_map;
1424 void tempo_map_changed (Change);
1426 /* edit/mix groups */
1428 int load_route_groups (const XMLNode&, bool is_edit);
1429 int load_edit_groups (const XMLNode&);
1430 int load_mix_groups (const XMLNode&);
1433 list<RouteGroup *> edit_groups;
1434 list<RouteGroup *> mix_groups;
1438 SerializedRCUManager<DiskstreamList> diskstreams;
1440 uint32_t audio_dstream_buffer_size;
1441 uint32_t midi_dstream_buffer_size;
1442 int load_diskstreams (const XMLNode&);
1446 SerializedRCUManager<RouteList> routes;
1448 void add_routes (RouteList&, bool save);
1449 uint32_t destructive_index;
1451 int load_routes (const XMLNode&);
1452 boost::shared_ptr<Route> XMLRouteFactory (const XMLNode&);
1456 bool solo_update_disabled;
1457 bool currently_soloing;
1459 void route_mute_changed (void *src);
1460 void route_solo_changed (void *src, boost::weak_ptr<Route>);
1461 void catch_up_on_solo ();
1462 void update_route_solo_state ();
1463 void modify_solo_mute (bool, bool);
1464 void strip_portname_for_solo (string& portname);
1466 /* REGION MANAGEMENT */
1468 std::map<std::string,uint32_t> region_name_map;
1469 void update_region_name_map (boost::shared_ptr<Region>);
1471 mutable Glib::Mutex region_lock;
1472 typedef map<PBD::ID,boost::shared_ptr<Region> > RegionList;
1475 void add_region (boost::shared_ptr<Region>);
1476 void region_changed (Change, boost::weak_ptr<Region>);
1477 void remove_region (boost::weak_ptr<Region>);
1479 int load_regions (const XMLNode& node);
1483 mutable Glib::Mutex source_lock;
1484 typedef std::map<PBD::ID,boost::shared_ptr<Source> > SourceMap;
1489 SourceMap get_sources() { return sources; }
1494 int load_sources (const XMLNode& node);
1495 XMLNode& get_sources_as_xml ();
1497 boost::shared_ptr<Source> XMLSourceFactory (const XMLNode&);
1501 mutable Glib::Mutex playlist_lock;
1502 typedef set<boost::shared_ptr<Playlist> > PlaylistList;
1503 PlaylistList playlists;
1504 PlaylistList unused_playlists;
1506 int load_playlists (const XMLNode&);
1507 int load_unused_playlists (const XMLNode&);
1508 void remove_playlist (boost::weak_ptr<Playlist>);
1509 void track_playlist (bool, boost::weak_ptr<Playlist>);
1511 boost::shared_ptr<Playlist> playlist_factory (string name);
1512 boost::shared_ptr<Playlist> XMLPlaylistFactory (const XMLNode&);
1514 void playlist_length_changed ();
1515 void diskstream_playlist_changed (boost::shared_ptr<Diskstream>);
1517 /* NAMED SELECTIONS */
1519 mutable Glib::Mutex named_selection_lock;
1520 typedef set<NamedSelection *> NamedSelectionList;
1521 NamedSelectionList named_selections;
1523 int load_named_selections (const XMLNode&);
1525 NamedSelection *named_selection_factory (string name);
1526 NamedSelection *XMLNamedSelectionFactory (const XMLNode&);
1528 /* CURVES and AUTOMATION LISTS */
1529 std::map<PBD::ID, Evoral::Curve*> curves;
1530 std::map<PBD::ID, AutomationList*> automation_lists;
1532 /* DEFAULT FADE CURVES */
1534 float default_fade_steepness;
1535 float default_fade_msecs;
1539 boost::shared_ptr<Auditioner> auditioner;
1540 void set_audition (boost::shared_ptr<Region>);
1541 void non_realtime_set_audition ();
1542 boost::shared_ptr<Region> pending_audition_region;
1548 int flatten_one_track (AudioTrack&, nframes_t start, nframes_t cnt);
1550 /* INSERT AND SEND MANAGEMENT */
1552 list<PortInsert *> _port_inserts;
1553 list<PluginInsert *> _plugin_inserts;
1554 list<Send *> _sends;
1555 boost::dynamic_bitset<uint32_t> send_bitset;
1556 boost::dynamic_bitset<uint32_t> insert_bitset;
1558 uint32_t insert_cnt;
1561 void add_processor (Processor *);
1562 void remove_processor (Processor *);
1566 struct space_and_path {
1567 uint32_t blocks; /* 4kB blocks */
1575 struct space_and_path_ascending_cmp {
1576 bool operator() (space_and_path a, space_and_path b) {
1577 return a.blocks > b.blocks;
1581 void setup_raid_path (string path);
1583 vector<space_and_path> session_dirs;
1584 vector<space_and_path>::iterator last_rr_session_dir;
1585 uint32_t _total_free_4k_blocks;
1586 Glib::Mutex space_lock;
1588 string get_best_session_directory_for_new_source ();
1589 void refresh_disk_space ();
1591 mutable gint _playback_load;
1592 mutable gint _capture_load;
1593 mutable gint _playback_load_min;
1594 mutable gint _capture_load_min;
1598 typedef list<boost::shared_ptr<Bundle> > BundleList;
1599 mutable Glib::Mutex bundle_lock;
1600 BundleList _bundles;
1601 XMLNode* _bundle_xml_node;
1602 int load_bundles (XMLNode const &);
1604 void reverse_diskstream_buffers ();
1606 UndoHistory _history;
1607 UndoTransaction* current_trans;
1609 GlobalRouteBooleanState get_global_route_boolean (bool (Route::*method)(void) const);
1610 GlobalRouteMeterState get_global_route_metering ();
1612 void set_global_route_boolean (GlobalRouteBooleanState s, void (Route::*method)(bool, void*), void *arg);
1613 void set_global_route_metering (GlobalRouteMeterState s, void *arg);
1615 void set_global_mute (GlobalRouteBooleanState s, void *src);
1616 void set_global_solo (GlobalRouteBooleanState s, void *src);
1617 void set_global_record_enable (GlobalRouteBooleanState s, void *src);
1619 void jack_timebase_callback (jack_transport_state_t, nframes_t, jack_position_t*, int);
1620 int jack_sync_callback (jack_transport_state_t, jack_position_t*);
1621 void reset_jack_connection (jack_client_t* jack);
1622 void record_enable_change_all (bool yn);
1624 XMLNode& state(bool);
1634 Click (nframes_t s, nframes_t d, const Sample *b)
1635 : start (s), duration (d), data (b) { offset = 0; }
1637 void *operator new(size_t ignored) {
1638 return pool.alloc ();
1641 void operator delete(void *ptr, size_t size) {
1649 typedef list<Click*> Clicks;
1653 boost::shared_ptr<IO> _click_io;
1655 Sample* click_emphasis_data;
1656 nframes_t click_length;
1657 nframes_t click_emphasis_length;
1658 mutable Glib::RWLock click_lock;
1660 static const Sample default_click[];
1661 static const nframes_t default_click_length;
1662 static const Sample default_click_emphasis[];
1663 static const nframes_t default_click_emphasis_length;
1666 void setup_click_sounds (int which);
1667 void clear_clicks ();
1668 void click (nframes_t start, nframes_t nframes, nframes_t offset);
1670 vector<Route*> master_outs;
1672 /* range playback */
1674 list<AudioRange> current_audio_range;
1676 void set_play_range (bool yn);
1677 void setup_auto_play ();
1682 boost::shared_ptr<IO> _master_out;
1683 boost::shared_ptr<IO> _control_out;
1685 gain_t* _gain_automation_buffer;
1686 pan_t** _pan_automation_buffer;
1687 void allocate_pan_automation_buffers (nframes_t nframes, uint32_t howmany, bool force);
1688 uint32_t _npan_buffers;
1692 long _vst_callback (VSTPlugin*,
1699 /* number of hardware ports we're using,
1700 based on max (requested,available)
1703 uint32_t n_physical_outputs;
1704 uint32_t n_physical_inputs;
1707 int find_all_sources (std::string path, std::set<std::string>& result);
1708 int find_all_sources_across_snapshots (std::set<std::string>& result, bool exclude_this_snapshot);
1710 LayerModel layer_model;
1711 CrossfadeModel xfade_model;
1713 typedef std::set<boost::shared_ptr<PBD::Controllable> > Controllables;
1714 Glib::Mutex controllables_lock;
1715 Controllables controllables;
1717 void reset_native_file_format();
1718 bool first_file_data_format_reset;
1719 bool first_file_header_format_reset;
1721 void config_changed (const char*);
1723 XMLNode& get_control_protocol_state ();
1725 void set_history_depth (uint32_t depth);
1726 void sync_order_keys ();
1728 static bool _disable_all_loaded_plugins;
1732 SessionMetadata * _metadata;
1734 SessionMetadata & metadata () { return *_metadata; }
1737 } // namespace ARDOUR
1739 #endif /* __ardour_session_h__ */