libs/ardour/session.cc

   1 /*
   2     Copyright (C) 1999-2004 Paul Davis
   3
   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.
   8
   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.
  13
  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.
  17
  18     $Id$
  19 */
  20
  21 #include <algorithm>
  22 #include <string>
  23 #include <vector>
  24 #include <sstream>
  25 #include <fstream>
  26 #include <cstdio> /* sprintf(3) ... grrr */
  27 #include <cmath>
  28 #include <cerrno>
  29 #include <unistd.h>
  30 #include <limits.h>
  31
  32 #include <sigc++/bind.h>
  33 #include <sigc++/retype.h>
  34
  35 #include <glibmm/thread.h>
  36 #include <glibmm/miscutils.h>
  37
  38 #include <pbd/error.h>
  39 #include <glibmm/thread.h>
  40 #include <pbd/pathscanner.h>
  41 #include <pbd/stl_delete.h>
  42 #include <pbd/basename.h>
  43 #include <pbd/stacktrace.h>
  44
  45 #include <ardour/audioengine.h>
  46 #include <ardour/configuration.h>
  47 #include <ardour/session.h>
  48 #include <ardour/audio_diskstream.h>
  49 #include <ardour/utils.h>
  50 #include <ardour/audioplaylist.h>
  51 #include <ardour/audioregion.h>
  52 #include <ardour/audiofilesource.h>
  53 #include <ardour/destructive_filesource.h>
  54 #include <ardour/auditioner.h>
  55 #include <ardour/recent_sessions.h>
  56 #include <ardour/redirect.h>
  57 #include <ardour/send.h>
  58 #include <ardour/insert.h>
  59 #include <ardour/connection.h>
  60 #include <ardour/slave.h>
  61 #include <ardour/tempo.h>
  62 #include <ardour/audio_track.h>
  63 #include <ardour/cycle_timer.h>
  64 #include <ardour/named_selection.h>
  65 #include <ardour/crossfade.h>
  66 #include <ardour/playlist.h>
  67 #include <ardour/click.h>
  68 #include <ardour/data_type.h>
  69 #include <ardour/source_factory.h>
  70 #include <ardour/region_factory.h>
  71
  72 #ifdef HAVE_LIBLO
  73 #include <ardour/osc.h>
  74 #endif
  75
  76 #include "i18n.h"
  77
  78 using namespace std;
  79 using namespace ARDOUR;
  80 using namespace PBD;
  81 using boost::shared_ptr;
  82
  83 const char* Session::_template_suffix = X_(".template");
  84 const char* Session::_statefile_suffix = X_(".ardour");
  85 const char* Session::_pending_suffix = X_(".pending");
  86 const char* Session::old_sound_dir_name = X_("sounds");
  87 const char* Session::sound_dir_name = X_("audiofiles");
  88 const char* Session::peak_dir_name = X_("peaks");
  89 const char* Session::dead_sound_dir_name = X_("dead_sounds");
  90 const char* Session::interchange_dir_name = X_("interchange");
  91
  92 Session::compute_peak_t                         Session::compute_peak                   = 0;
  93 Session::apply_gain_to_buffer_t         Session::apply_gain_to_buffer   = 0;
  94 Session::mix_buffers_with_gain_t        Session::mix_buffers_with_gain  = 0;
  95 Session::mix_buffers_no_gain_t          Session::mix_buffers_no_gain    = 0;
  96
  97 sigc::signal<int> Session::AskAboutPendingState;
  98 sigc::signal<void> Session::SendFeedback;
  99
 100 sigc::signal<void> Session::SMPTEOffsetChanged;
 101 sigc::signal<void> Session::StartTimeChanged;
 102 sigc::signal<void> Session::EndTimeChanged;
 103
 104 int
 105 Session::find_session (string str, string& path, string& snapshot, bool& isnew)
 106 {
 107         struct stat statbuf;
 108         char buf[PATH_MAX+1];
 109
 110         isnew = false;
 111
 112         if (!realpath (str.c_str(), buf) && (errno != ENOENT && errno != ENOTDIR)) {
 113                 error << string_compose (_("Could not resolve path: %1 (%2)"), buf, strerror(errno)) << endmsg;
 114                 return -1;
 115         }
 116
 117         str = buf;
 118
 119         /* check to see if it exists, and what it is */
 120
 121         if (stat (str.c_str(), &statbuf)) {
 122                 if (errno == ENOENT) {
 123                         isnew = true;
 124                 } else {
 125                         error << string_compose (_("cannot check session path %1 (%2)"), str, strerror (errno))
 126                               << endmsg;
 127                         return -1;
 128                 }
 129         }
 130
 131         if (!isnew) {
 132
 133                 /* it exists, so it must either be the name
 134                    of the directory, or the name of the statefile
 135                    within it.
 136                 */
 137
 138                 if (S_ISDIR (statbuf.st_mode)) {
 139
 140                         string::size_type slash = str.find_last_of ('/');
 141
 142                         if (slash == string::npos) {
 143
 144                                 /* a subdirectory of cwd, so statefile should be ... */
 145
 146                                 string tmp;
 147                                 tmp = str;
 148                                 tmp += '/';
 149                                 tmp += str;
 150                                 tmp += _statefile_suffix;
 151
 152                                 /* is it there ? */
 153
 154                                 if (stat (tmp.c_str(), &statbuf)) {
 155                                         error << string_compose (_("cannot check statefile %1 (%2)"), tmp, strerror (errno))
 156                                               << endmsg;
 157                                         return -1;
 158                                 }
 159
 160                                 path = str;
 161                                 snapshot = str;
 162
 163                         } else {
 164
 165                                 /* some directory someplace in the filesystem.
 166                                    the snapshot name is the directory name
 167                                    itself.
 168                                 */
 169
 170                                 path = str;
 171                                 snapshot = str.substr (slash+1);
 172
 173                         }
 174
 175                 } else if (S_ISREG (statbuf.st_mode)) {
 176
 177                         string::size_type slash = str.find_last_of ('/');
 178                         string::size_type suffix;
 179
 180                         /* remove the suffix */
 181
 182                         if (slash != string::npos) {
 183                                 snapshot = str.substr (slash+1);
 184                         } else {
 185                                 snapshot = str;
 186                         }
 187
 188                         suffix = snapshot.find (_statefile_suffix);
 189
 190                         if (suffix == string::npos) {
 191                                 error << string_compose (_("%1 is not an Ardour snapshot file"), str) << endmsg;
 192                                 return -1;
 193                         }
 194
 195                         /* remove suffix */
 196
 197                         snapshot = snapshot.substr (0, suffix);
 198
 199                         if (slash == string::npos) {
 200
 201                                 /* we must be in the directory where the
 202                                    statefile lives. get it using cwd().
 203                                 */
 204
 205                                 char cwd[PATH_MAX+1];
 206
 207                                 if (getcwd (cwd, sizeof (cwd)) == 0) {
 208                                         error << string_compose (_("cannot determine current working directory (%1)"), strerror (errno))
 209                                               << endmsg;
 210                                         return -1;
 211                                 }
 212
 213                                 path = cwd;
 214
 215                         } else {
 216
 217                                 /* full path to the statefile */
 218
 219                                 path = str.substr (0, slash);
 220                         }
 221
 222                 } else {
 223
 224                         /* what type of file is it? */
 225                         error << string_compose (_("unknown file type for session %1"), str) << endmsg;
 226                         return -1;
 227                 }
 228
 229         } else {
 230
 231                 /* its the name of a new directory. get the name
 232                    as "dirname" does.
 233                 */
 234
 235                 string::size_type slash = str.find_last_of ('/');
 236
 237                 if (slash == string::npos) {
 238
 239                         /* no slash, just use the name, but clean it up */
 240
 241                         path = legalize_for_path (str);
 242                         snapshot = path;
 243
 244                 } else {
 245
 246                         path = str;
 247                         snapshot = str.substr (slash+1);
 248                 }
 249         }
 250
 251         return 0;
 252 }
 253
 254 Session::Session (AudioEngine &eng,
 255                   string fullpath,
 256                   string snapshot_name,
 257                   string* mix_template)
 258
 259         : _engine (eng),
 260           _mmc_port (default_mmc_port),
 261           _mtc_port (default_mtc_port),
 262           _midi_port (default_midi_port),
 263           pending_events (2048),
 264           midi_requests (128), // the size of this should match the midi request pool size
 265           diskstreams (new DiskstreamList),
 266           routes (new RouteList),
 267           auditioner ((Auditioner*) 0),
 268           _click_io ((IO*) 0),
 269           main_outs (0)
 270 {
 271         bool new_session;
 272
 273         cerr << "Loading session " << fullpath << " using snapshot " << snapshot_name << " (1)" << endl;
 274
 275         n_physical_outputs = _engine.n_physical_outputs();
 276         n_physical_inputs =  _engine.n_physical_inputs();
 277
 278         first_stage_init (fullpath, snapshot_name);
 279
 280         new_session = !g_file_test (_path.c_str(), GFileTest (G_FILE_TEST_EXISTS | G_FILE_TEST_IS_DIR));
 281         if (new_session) {
 282                 if (create (new_session, mix_template, compute_initial_length())) {
 283                         cerr << "create failed\n";
 284                         destroy ();
 285                         throw failed_constructor ();
 286                 }
 287         }
 288
 289         if (second_stage_init (new_session)) {
 290                 destroy ();
 291                 throw failed_constructor ();
 292         }
 293
 294         store_recent_sessions(_name, _path);
 295
 296         bool was_dirty = dirty();
 297
 298         _state_of_the_state = StateOfTheState (_state_of_the_state & ~Dirty);
 299
 300         Config->ParameterChanged.connect (mem_fun (*this, &Session::config_changed));
 301
 302         if (was_dirty) {
 303                 DirtyChanged (); /* EMIT SIGNAL */
 304         }
 305 }
 306
 307 Session::Session (AudioEngine &eng,
 308                   string fullpath,
 309                   string snapshot_name,
 310                   AutoConnectOption input_ac,
 311                   AutoConnectOption output_ac,
 312                   uint32_t control_out_channels,
 313                   uint32_t master_out_channels,
 314                   uint32_t requested_physical_in,
 315                   uint32_t requested_physical_out,
 316                   nframes_t initial_length)
 317
 318         : _engine (eng),
 319           _mmc_port (default_mmc_port),
 320           _mtc_port (default_mtc_port),
 321           _midi_port (default_midi_port),
 322           pending_events (2048),
 323           midi_requests (16),
 324           diskstreams (new DiskstreamList),
 325           routes (new RouteList),
 326           main_outs (0)
 327
 328 {
 329         bool new_session;
 330
 331         cerr << "Loading session " << fullpath << " using snapshot " << snapshot_name << " (2)" << endl;
 332
 333         n_physical_outputs = _engine.n_physical_outputs();
 334         n_physical_inputs = _engine.n_physical_inputs();
 335
 336         if (n_physical_inputs) {
 337                 n_physical_inputs = max (requested_physical_in, n_physical_inputs);
 338         }
 339
 340         if (n_physical_outputs) {
 341                 n_physical_outputs = max (requested_physical_out, n_physical_outputs);
 342         }
 343
 344         first_stage_init (fullpath, snapshot_name);
 345
 346         new_session = !g_file_test (_path.c_str(), GFileTest (G_FILE_TEST_EXISTS | G_FILE_TEST_IS_DIR));
 347
 348         if (new_session) {
 349                 if (create (new_session, 0, initial_length)) {
 350                         destroy ();
 351                         throw failed_constructor ();
 352                 }
 353         }
 354
 355         {
 356                 /* set up Master Out and Control Out if necessary */
 357
 358                 RouteList rl;
 359                 int control_id = 1;
 360
 361                 if (control_out_channels) {
 362                         shared_ptr<Route> r (new Route (*this, _("monitor"), -1, control_out_channels, -1, control_out_channels, Route::ControlOut));
 363                         r->set_remote_control_id (control_id++);
 364
 365                         rl.push_back (r);
 366                 }
 367
 368                 if (master_out_channels) {
 369                         shared_ptr<Route> r (new Route (*this, _("master"), -1, master_out_channels, -1, master_out_channels, Route::MasterOut));
 370                         r->set_remote_control_id (control_id);
 371
 372                         rl.push_back (r);
 373                 } else {
 374                         /* prohibit auto-connect to master, because there isn't one */
 375                         output_ac = AutoConnectOption (output_ac & ~AutoConnectMaster);
 376                 }
 377
 378                 if (!rl.empty()) {
 379                         add_routes (rl);
 380                 }
 381
 382         }
 383
 384         Config->set_input_auto_connect (input_ac);
 385         Config->set_output_auto_connect (output_ac);
 386
 387         if (second_stage_init (new_session)) {
 388                 destroy ();
 389                 throw failed_constructor ();
 390         }
 391
 392         store_recent_sessions(_name, _path);
 393
 394         bool was_dirty = dirty ();
 395
 396         _state_of_the_state = StateOfTheState (_state_of_the_state & ~Dirty);
 397
 398         Config->ParameterChanged.connect (mem_fun (*this, &Session::config_changed));
 399
 400         if (was_dirty) {
 401                 DirtyChanged (); /* EMIT SIGNAL */
 402         }
 403 }
 404
 405 Session::~Session ()
 406 {
 407         destroy ();
 408 }
 409
 410 void
 411 Session::destroy ()
 412 {
 413         /* if we got to here, leaving pending capture state around
 414            is a mistake.
 415         */
 416
 417         remove_pending_capture_state ();
 418
 419         _state_of_the_state = StateOfTheState (CannotSave|Deletion);
 420         _engine.remove_session ();
 421
 422         GoingAway (); /* EMIT SIGNAL */
 423
 424         /* do this */
 425
 426         notify_callbacks ();
 427
 428         /* clear history so that no references to objects are held any more */
 429
 430         _history.clear ();
 431
 432         /* clear state tree so that no references to objects are held any more */
 433
 434         if (state_tree) {
 435                 delete state_tree;
 436         }
 437
 438         terminate_butler_thread ();
 439         terminate_midi_thread ();
 440
 441         if (click_data && click_data != default_click) {
 442                 delete [] click_data;
 443         }
 444
 445         if (click_emphasis_data && click_emphasis_data != default_click_emphasis) {
 446                 delete [] click_emphasis_data;
 447         }
 448
 449         clear_clicks ();
 450
 451         for (vector<Sample*>::iterator i = _passthru_buffers.begin(); i != _passthru_buffers.end(); ++i) {
 452                 free(*i);
 453         }
 454
 455         for (vector<Sample*>::iterator i = _silent_buffers.begin(); i != _silent_buffers.end(); ++i) {
 456                 free(*i);
 457         }
 458
 459         for (vector<Sample*>::iterator i = _send_buffers.begin(); i != _send_buffers.end(); ++i) {
 460                 free(*i);
 461         }
 462
 463         AudioDiskstream::free_working_buffers();
 464
 465         /* this should cause deletion of the auditioner */
 466
 467         // auditioner.reset ();
 468
 469 #undef TRACK_DESTRUCTION
 470 #ifdef TRACK_DESTRUCTION
 471         cerr << "delete named selections\n";
 472 #endif /* TRACK_DESTRUCTION */
 473         for (NamedSelectionList::iterator i = named_selections.begin(); i != named_selections.end(); ) {
 474                 NamedSelectionList::iterator tmp;
 475
 476                 tmp = i;
 477                 ++tmp;
 478
 479                 delete *i;
 480                 i = tmp;
 481         }
 482
 483 #ifdef TRACK_DESTRUCTION
 484         cerr << "delete playlists\n";
 485 #endif /* TRACK_DESTRUCTION */
 486         for (PlaylistList::iterator i = playlists.begin(); i != playlists.end(); ) {
 487                 PlaylistList::iterator tmp;
 488
 489                 tmp = i;
 490                 ++tmp;
 491
 492                 (*i)->drop_references ();
 493
 494                 i = tmp;
 495         }
 496
 497         for (PlaylistList::iterator i = unused_playlists.begin(); i != unused_playlists.end(); ) {
 498                 PlaylistList::iterator tmp;
 499
 500                 tmp = i;
 501                 ++tmp;
 502
 503                 (*i)->drop_references ();
 504
 505                 i = tmp;
 506         }
 507
 508         playlists.clear ();
 509         unused_playlists.clear ();
 510
 511 #ifdef TRACK_DESTRUCTION
 512         cerr << "delete audio regions\n";
 513 #endif /* TRACK_DESTRUCTION */
 514
 515         for (AudioRegionList::iterator i = audio_regions.begin(); i != audio_regions.end(); ) {
 516                 AudioRegionList::iterator tmp;
 517
 518                 tmp = i;
 519                 ++tmp;
 520
 521                 i->second->drop_references ();
 522
 523                 i = tmp;
 524         }
 525
 526         audio_regions.clear ();
 527
 528 #ifdef TRACK_DESTRUCTION
 529         cerr << "delete routes\n";
 530 #endif /* TRACK_DESTRUCTION */
 531         {
 532                 RCUWriter<RouteList> writer (routes);
 533                 boost::shared_ptr<RouteList> r = writer.get_copy ();
 534                 for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 535                         (*i)->drop_references ();
 536                 }
 537                 r->clear ();
 538                 /* writer goes out of scope and updates master */
 539         }
 540
 541         routes.flush ();
 542
 543 #ifdef TRACK_DESTRUCTION
 544         cerr << "delete diskstreams\n";
 545 #endif /* TRACK_DESTRUCTION */
 546        {
 547                RCUWriter<DiskstreamList> dwriter (diskstreams);
 548                boost::shared_ptr<DiskstreamList> dsl = dwriter.get_copy();
 549                for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
 550                        (*i)->drop_references ();
 551                }
 552                dsl->clear ();
 553        }
 554        diskstreams.flush ();
 555
 556 #ifdef TRACK_DESTRUCTION
 557         cerr << "delete audio sources\n";
 558 #endif /* TRACK_DESTRUCTION */
 559         for (AudioSourceList::iterator i = audio_sources.begin(); i != audio_sources.end(); ) {
 560                 AudioSourceList::iterator tmp;
 561
 562                 tmp = i;
 563                 ++tmp;
 564
 565                 i->second->drop_references ();
 566
 567                 i = tmp;
 568         }
 569
 570         audio_sources.clear ();
 571
 572 #ifdef TRACK_DESTRUCTION
 573         cerr << "delete mix groups\n";
 574 #endif /* TRACK_DESTRUCTION */
 575         for (list<RouteGroup *>::iterator i = mix_groups.begin(); i != mix_groups.end(); ) {
 576                 list<RouteGroup*>::iterator tmp;
 577
 578                 tmp = i;
 579                 ++tmp;
 580
 581                 delete *i;
 582
 583                 i = tmp;
 584         }
 585
 586 #ifdef TRACK_DESTRUCTION
 587         cerr << "delete edit groups\n";
 588 #endif /* TRACK_DESTRUCTION */
 589         for (list<RouteGroup *>::iterator i = edit_groups.begin(); i != edit_groups.end(); ) {
 590                 list<RouteGroup*>::iterator tmp;
 591
 592                 tmp = i;
 593                 ++tmp;
 594
 595                 delete *i;
 596
 597                 i = tmp;
 598         }
 599
 600 #ifdef TRACK_DESTRUCTION
 601         cerr << "delete connections\n";
 602 #endif /* TRACK_DESTRUCTION */
 603         for (ConnectionList::iterator i = _connections.begin(); i != _connections.end(); ) {
 604                 ConnectionList::iterator tmp;
 605
 606                 tmp = i;
 607                 ++tmp;
 608
 609                 delete *i;
 610
 611                 i = tmp;
 612         }
 613
 614         if (butler_mixdown_buffer) {
 615                 delete [] butler_mixdown_buffer;
 616         }
 617
 618         if (butler_gain_buffer) {
 619                 delete [] butler_gain_buffer;
 620         }
 621
 622         Crossfade::set_buffer_size (0);
 623
 624         if (mmc) {
 625                 delete mmc;
 626         }
 627 }
 628
 629 void
 630 Session::set_worst_io_latencies ()
 631 {
 632         _worst_output_latency = 0;
 633         _worst_input_latency = 0;
 634
 635         if (!_engine.connected()) {
 636                 return;
 637         }
 638
 639         boost::shared_ptr<RouteList> r = routes.reader ();
 640
 641         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 642                 _worst_output_latency = max (_worst_output_latency, (*i)->output_latency());
 643                 _worst_input_latency = max (_worst_input_latency, (*i)->input_latency());
 644         }
 645 }
 646
 647 void
 648 Session::when_engine_running ()
 649 {
 650         string first_physical_output;
 651
 652         /* we don't want to run execute this again */
 653
 654         set_block_size (_engine.frames_per_cycle());
 655         set_frame_rate (_engine.frame_rate());
 656
 657         Config->map_parameters (mem_fun (*this, &Session::config_changed));
 658
 659         /* every time we reconnect, recompute worst case output latencies */
 660
 661         _engine.Running.connect (mem_fun (*this, &Session::set_worst_io_latencies));
 662
 663         if (synced_to_jack()) {
 664                 _engine.transport_stop ();
 665         }
 666
 667         if (Config->get_jack_time_master()) {
 668                 _engine.transport_locate (_transport_frame);
 669         }
 670
 671         _clicking = false;
 672
 673         try {
 674                 XMLNode* child = 0;
 675
 676                 _click_io.reset (new ClickIO (*this, "click", 0, 0, -1, -1));
 677
 678                 if (state_tree && (child = find_named_node (*state_tree->root(), "Click")) != 0) {
 679
 680                         /* existing state for Click */
 681
 682                         if (_click_io->set_state (*child->children().front()) == 0) {
 683
 684                                 _clicking = Config->get_clicking ();
 685
 686                         } else {
 687
 688                                 error << _("could not setup Click I/O") << endmsg;
 689                                 _clicking = false;
 690                         }
 691
 692                 } else {
 693
 694                         /* default state for Click */
 695
 696                         first_physical_output = _engine.get_nth_physical_output (0);
 697
 698                         if (first_physical_output.length()) {
 699                                 if (_click_io->add_output_port (first_physical_output, this)) {
 700                                         // relax, even though its an error
 701                                 } else {
 702                                         _clicking = Config->get_clicking ();
 703                                 }
 704                         }
 705                 }
 706         }
 707
 708         catch (failed_constructor& err) {
 709                 error << _("cannot setup Click I/O") << endmsg;
 710         }
 711
 712         set_worst_io_latencies ();
 713
 714         if (_clicking) {
 715                 // XXX HOW TO ALERT UI TO THIS ? DO WE NEED TO?
 716         }
 717
 718         /* Create a set of Connection objects that map
 719            to the physical outputs currently available
 720         */
 721
 722         /* ONE: MONO */
 723
 724         for (uint32_t np = 0; np < n_physical_outputs; ++np) {
 725                 char buf[32];
 726                 snprintf (buf, sizeof (buf), _("out %" PRIu32), np+1);
 727
 728                 Connection* c = new OutputConnection (buf, true);
 729
 730                 c->add_port ();
 731                 c->add_connection (0, _engine.get_nth_physical_output (np));
 732
 733                 add_connection (c);
 734         }
 735
 736         for (uint32_t np = 0; np < n_physical_inputs; ++np) {
 737                 char buf[32];
 738                 snprintf (buf, sizeof (buf), _("in %" PRIu32), np+1);
 739
 740                 Connection* c = new InputConnection (buf, true);
 741
 742                 c->add_port ();
 743                 c->add_connection (0, _engine.get_nth_physical_input (np));
 744
 745                 add_connection (c);
 746         }
 747
 748         /* TWO: STEREO */
 749
 750         for (uint32_t np = 0; np < n_physical_outputs; np +=2) {
 751                 char buf[32];
 752                 snprintf (buf, sizeof (buf), _("out %" PRIu32 "+%" PRIu32), np+1, np+2);
 753
 754                 Connection* c = new OutputConnection (buf, true);
 755
 756                 c->add_port ();
 757                 c->add_port ();
 758                 c->add_connection (0, _engine.get_nth_physical_output (np));
 759                 c->add_connection (1, _engine.get_nth_physical_output (np+1));
 760
 761                 add_connection (c);
 762         }
 763
 764         for (uint32_t np = 0; np < n_physical_inputs; np +=2) {
 765                 char buf[32];
 766                 snprintf (buf, sizeof (buf), _("in %" PRIu32 "+%" PRIu32), np+1, np+2);
 767
 768                 Connection* c = new InputConnection (buf, true);
 769
 770                 c->add_port ();
 771                 c->add_port ();
 772                 c->add_connection (0, _engine.get_nth_physical_input (np));
 773                 c->add_connection (1, _engine.get_nth_physical_input (np+1));
 774
 775                 add_connection (c);
 776         }
 777
 778         /* THREE MASTER */
 779
 780         if (_master_out) {
 781
 782                 /* create master/control ports */
 783
 784                 if (_master_out) {
 785                         uint32_t n;
 786
 787                         /* force the master to ignore any later call to this */
 788
 789                         if (_master_out->pending_state_node) {
 790                                 _master_out->ports_became_legal();
 791                         }
 792
 793                         /* no panner resets till we are through */
 794
 795                         _master_out->defer_pan_reset ();
 796
 797                         while ((int) _master_out->n_inputs() < _master_out->input_maximum()) {
 798                                 if (_master_out->add_input_port ("", this)) {
 799                                         error << _("cannot setup master inputs")
 800                                               << endmsg;
 801                                         break;
 802                                 }
 803                         }
 804                         n = 0;
 805                         while ((int) _master_out->n_outputs() < _master_out->output_maximum()) {
 806                                 if (_master_out->add_output_port (_engine.get_nth_physical_output (n), this)) {
 807                                         error << _("cannot setup master outputs")
 808                                               << endmsg;
 809                                         break;
 810                                 }
 811                                 n++;
 812                         }
 813
 814                         _master_out->allow_pan_reset ();
 815
 816                 }
 817
 818                 Connection* c = new OutputConnection (_("Master Out"), true);
 819
 820                 for (uint32_t n = 0; n < _master_out->n_inputs (); ++n) {
 821                         c->add_port ();
 822                         c->add_connection ((int) n, _master_out->input(n)->name());
 823                 }
 824                 add_connection (c);
 825         }
 826
 827         hookup_io ();
 828
 829         /* catch up on send+insert cnts */
 830
 831         insert_cnt = 0;
 832
 833         for (list<PortInsert*>::iterator i = _port_inserts.begin(); i != _port_inserts.end(); ++i) {
 834                 uint32_t id;
 835
 836                 if (sscanf ((*i)->name().c_str(), "%*s %u", &id) == 1) {
 837                         if (id > insert_cnt) {
 838                                 insert_cnt = id;
 839                         }
 840                 }
 841         }
 842
 843         send_cnt = 0;
 844
 845         for (list<Send*>::iterator i = _sends.begin(); i != _sends.end(); ++i) {
 846                 uint32_t id;
 847
 848                 if (sscanf ((*i)->name().c_str(), "%*s %u", &id) == 1) {
 849                         if (id > send_cnt) {
 850                                 send_cnt = id;
 851                         }
 852                 }
 853         }
 854
 855
 856         _state_of_the_state = StateOfTheState (_state_of_the_state & ~(CannotSave|Dirty));
 857
 858         /* hook us up to the engine */
 859
 860         _engine.set_session (this);
 861
 862 #ifdef HAVE_LIBLO
 863         /* and to OSC */
 864
 865         osc->set_session (*this);
 866 #endif
 867
 868         _state_of_the_state = Clean;
 869
 870         DirtyChanged (); /* EMIT SIGNAL */
 871 }
 872
 873 void
 874 Session::hookup_io ()
 875 {
 876         /* stop graph reordering notifications from
 877            causing resorts, etc.
 878         */
 879
 880         _state_of_the_state = StateOfTheState (_state_of_the_state | InitialConnecting);
 881
 882         if (auditioner == 0) {
 883
 884                 /* we delay creating the auditioner till now because
 885                    it makes its own connections to ports.
 886                    the engine has to be running for this to work.
 887                 */
 888
 889                 try {
 890                         auditioner.reset (new Auditioner (*this));
 891                 }
 892
 893                 catch (failed_constructor& err) {
 894                         warning << _("cannot create Auditioner: no auditioning of regions possible") << endmsg;
 895                 }
 896         }
 897
 898         /* Tell all IO objects to create their ports */
 899
 900         IO::enable_ports ();
 901
 902         if (_control_out) {
 903                 uint32_t n;
 904
 905                 while ((int) _control_out->n_inputs() < _control_out->input_maximum()) {
 906                         if (_control_out->add_input_port ("", this)) {
 907                                 error << _("cannot setup control inputs")
 908                                       << endmsg;
 909                                 break;
 910                         }
 911                 }
 912                 n = 0;
 913                 while ((int) _control_out->n_outputs() < _control_out->output_maximum()) {
 914                         if (_control_out->add_output_port (_engine.get_nth_physical_output (n), this)) {
 915                                 error << _("cannot set up master outputs")
 916                                       << endmsg;
 917                                 break;
 918                         }
 919                         n++;
 920                 }
 921         }
 922
 923         /* Tell all IO objects to connect themselves together */
 924
 925         IO::enable_connecting ();
 926
 927         /* Now reset all panners */
 928
 929         IO::reset_panners ();
 930
 931         /* Anyone who cares about input state, wake up and do something */
 932
 933         IOConnectionsComplete (); /* EMIT SIGNAL */
 934
 935         _state_of_the_state = StateOfTheState (_state_of_the_state & ~InitialConnecting);
 936
 937         /* now handle the whole enchilada as if it was one
 938            graph reorder event.
 939         */
 940
 941         graph_reordered ();
 942
 943         /* update mixer solo state */
 944
 945         catch_up_on_solo();
 946 }
 947
 948 void
 949 Session::playlist_length_changed ()
 950 {
 951         /* we can't just increase end_location->end() if pl->get_maximum_extent()
 952            if larger. if the playlist used to be the longest playlist,
 953            and its now shorter, we have to decrease end_location->end(). hence,
 954            we have to iterate over all diskstreams and check the
 955            playlists currently in use.
 956         */
 957         find_current_end ();
 958 }
 959
 960 void
 961 Session::diskstream_playlist_changed (boost::shared_ptr<Diskstream> dstream)
 962 {
 963         boost::shared_ptr<Playlist> playlist;
 964
 965         if ((playlist = dstream->playlist()) != 0) {
 966                 playlist->LengthChanged.connect (mem_fun (this, &Session::playlist_length_changed));
 967         }
 968
 969         /* see comment in playlist_length_changed () */
 970         find_current_end ();
 971 }
 972
 973 bool
 974 Session::record_enabling_legal () const
 975 {
 976         /* this used to be in here, but survey says.... we don't need to restrict it */
 977         // if (record_status() == Recording) {
 978         //      return false;
 979         // }
 980
 981         if (Config->get_all_safe()) {
 982                 return false;
 983         }
 984         return true;
 985 }
 986
 987 void
 988 Session::reset_input_monitor_state ()
 989 {
 990         if (transport_rolling()) {
 991
 992                 boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 993
 994                 for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
 995                         if ((*i)->record_enabled ()) {
 996                                 //cerr << "switching to input = " << !auto_input << __FILE__ << __LINE__ << endl << endl;
 997                                 (*i)->monitor_input (Config->get_monitoring_model() == HardwareMonitoring && !Config->get_auto_input());
 998                         }
 999                 }
1000         } else {
1001                 boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
1002
1003                 for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
1004                         if ((*i)->record_enabled ()) {
1005                                 //cerr << "switching to input = " << !Config->get_auto_input() << __FILE__ << __LINE__ << endl << endl;
1006                                 (*i)->monitor_input (Config->get_monitoring_model() == HardwareMonitoring);
1007                         }
1008                 }
1009         }
1010 }
1011
1012 void
1013 Session::auto_punch_start_changed (Location* location)
1014 {
1015         replace_event (Event::PunchIn, location->start());
1016
1017         if (get_record_enabled() && Config->get_punch_in()) {
1018                 /* capture start has been changed, so save new pending state */
1019                 save_state ("", true);
1020         }
1021 }
1022
1023 void
1024 Session::auto_punch_end_changed (Location* location)
1025 {
1026         nframes_t when_to_stop = location->end();
1027         // when_to_stop += _worst_output_latency + _worst_input_latency;
1028         replace_event (Event::PunchOut, when_to_stop);
1029 }
1030
1031 void
1032 Session::auto_punch_changed (Location* location)
1033 {
1034         nframes_t when_to_stop = location->end();
1035
1036         replace_event (Event::PunchIn, location->start());
1037         //when_to_stop += _worst_output_latency + _worst_input_latency;
1038         replace_event (Event::PunchOut, when_to_stop);
1039 }
1040
1041 void
1042 Session::auto_loop_changed (Location* location)
1043 {
1044         replace_event (Event::AutoLoop, location->end(), location->start());
1045
1046         if (transport_rolling() && play_loop) {
1047
1048                 //if (_transport_frame < location->start() || _transport_frame > location->end()) {
1049
1050                 if (_transport_frame > location->end()) {
1051                         // relocate to beginning of loop
1052                         clear_events (Event::LocateRoll);
1053
1054                         request_locate (location->start(), true);
1055
1056                 }
1057                 else if (Config->get_seamless_loop() && !loop_changing) {
1058
1059                         // schedule a locate-roll to refill the diskstreams at the
1060                         // previous loop end
1061                         loop_changing = true;
1062
1063                         if (location->end() > last_loopend) {
1064                                 clear_events (Event::LocateRoll);
1065                                 Event *ev = new Event (Event::LocateRoll, Event::Add, last_loopend, last_loopend, 0, true);
1066                                 queue_event (ev);
1067                         }
1068
1069                 }
1070         }
1071
1072         last_loopend = location->end();
1073
1074 }
1075
1076 void
1077 Session::set_auto_punch_location (Location* location)
1078 {
1079         Location* existing;
1080
1081         if ((existing = _locations.auto_punch_location()) != 0 && existing != location) {
1082                 auto_punch_start_changed_connection.disconnect();
1083                 auto_punch_end_changed_connection.disconnect();
1084                 auto_punch_changed_connection.disconnect();
1085                 existing->set_auto_punch (false, this);
1086                 remove_event (existing->start(), Event::PunchIn);
1087                 clear_events (Event::PunchOut);
1088                 auto_punch_location_changed (0);
1089         }
1090
1091         set_dirty();
1092
1093         if (location == 0) {
1094                 return;
1095         }
1096
1097         if (location->end() <= location->start()) {
1098                 error << _("Session: you can't use that location for auto punch (start <= end)") << endmsg;
1099                 return;
1100         }
1101
1102         auto_punch_start_changed_connection.disconnect();
1103         auto_punch_end_changed_connection.disconnect();
1104         auto_punch_changed_connection.disconnect();
1105
1106         auto_punch_start_changed_connection = location->start_changed.connect (mem_fun (this, &Session::auto_punch_start_changed));
1107         auto_punch_end_changed_connection = location->end_changed.connect (mem_fun (this, &Session::auto_punch_end_changed));
1108         auto_punch_changed_connection = location->changed.connect (mem_fun (this, &Session::auto_punch_changed));
1109
1110         location->set_auto_punch (true, this);
1111         auto_punch_location_changed (location);
1112 }
1113
1114 void
1115 Session::set_auto_loop_location (Location* location)
1116 {
1117         Location* existing;
1118
1119         if ((existing = _locations.auto_loop_location()) != 0 && existing != location) {
1120                 auto_loop_start_changed_connection.disconnect();
1121                 auto_loop_end_changed_connection.disconnect();
1122                 auto_loop_changed_connection.disconnect();
1123                 existing->set_auto_loop (false, this);
1124                 remove_event (existing->end(), Event::AutoLoop);
1125                 auto_loop_location_changed (0);
1126         }
1127
1128         set_dirty();
1129
1130         if (location == 0) {
1131                 return;
1132         }
1133
1134         if (location->end() <= location->start()) {
1135                 error << _("Session: you can't use a mark for auto loop") << endmsg;
1136                 return;
1137         }
1138
1139         last_loopend = location->end();
1140
1141         auto_loop_start_changed_connection.disconnect();
1142         auto_loop_end_changed_connection.disconnect();
1143         auto_loop_changed_connection.disconnect();
1144
1145         auto_loop_start_changed_connection = location->start_changed.connect (mem_fun (this, &Session::auto_loop_changed));
1146         auto_loop_end_changed_connection = location->end_changed.connect (mem_fun (this, &Session::auto_loop_changed));
1147         auto_loop_changed_connection = location->changed.connect (mem_fun (this, &Session::auto_loop_changed));
1148
1149         location->set_auto_loop (true, this);
1150         auto_loop_location_changed (location);
1151 }
1152
1153 void
1154 Session::locations_added (Location* ignored)
1155 {
1156         set_dirty ();
1157 }
1158
1159 void
1160 Session::locations_changed ()
1161 {
1162         _locations.apply (*this, &Session::handle_locations_changed);
1163 }
1164
1165 void
1166 Session::handle_locations_changed (Locations::LocationList& locations)
1167 {
1168         Locations::LocationList::iterator i;
1169         Location* location;
1170         bool set_loop = false;
1171         bool set_punch = false;
1172
1173         for (i = locations.begin(); i != locations.end(); ++i) {
1174
1175                 location =* i;
1176
1177                 if (location->is_auto_punch()) {
1178                         set_auto_punch_location (location);
1179                         set_punch = true;
1180                 }
1181                 if (location->is_auto_loop()) {
1182                         set_auto_loop_location (location);
1183                         set_loop = true;
1184                 }
1185
1186         }
1187
1188         if (!set_loop) {
1189                 set_auto_loop_location (0);
1190         }
1191         if (!set_punch) {
1192                 set_auto_punch_location (0);
1193         }
1194
1195         set_dirty();
1196 }
1197
1198 void
1199 Session::enable_record ()
1200 {
1201         /* XXX really atomic compare+swap here */
1202         if (g_atomic_int_get (&_record_status) != Recording) {
1203                 g_atomic_int_set (&_record_status, Recording);
1204                 _last_record_location = _transport_frame;
1205                 send_mmc_in_another_thread (MIDI::MachineControl::cmdRecordStrobe);
1206
1207                 if (Config->get_monitoring_model() == HardwareMonitoring && Config->get_auto_input()) {
1208                         boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
1209                         for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
1210                                 if ((*i)->record_enabled ()) {
1211                                         (*i)->monitor_input (true);
1212                                 }
1213                         }
1214                 }
1215
1216                 RecordStateChanged ();
1217         }
1218 }
1219
1220 void
1221 Session::disable_record (bool rt_context, bool force)
1222 {
1223         RecordState rs;
1224
1225         if ((rs = (RecordState) g_atomic_int_get (&_record_status)) != Disabled) {
1226
1227                 if (!Config->get_latched_record_enable () || force) {
1228                         g_atomic_int_set (&_record_status, Disabled);
1229                 } else {
1230                         if (rs == Recording) {
1231                                 g_atomic_int_set (&_record_status, Enabled);
1232                         }
1233                 }
1234
1235                 send_mmc_in_another_thread (MIDI::MachineControl::cmdRecordExit);
1236
1237                 if (Config->get_monitoring_model() == HardwareMonitoring && Config->get_auto_input()) {
1238                         boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
1239
1240                         for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
1241                                 if ((*i)->record_enabled ()) {
1242                                         (*i)->monitor_input (false);
1243                                 }
1244                         }
1245                 }
1246
1247                 RecordStateChanged (); /* emit signal */
1248
1249                 if (!rt_context) {
1250                         remove_pending_capture_state ();
1251                 }
1252         }
1253 }
1254
1255 void
1256 Session::step_back_from_record ()
1257 {
1258         g_atomic_int_set (&_record_status, Enabled);
1259
1260         if (Config->get_monitoring_model() == HardwareMonitoring) {
1261                 boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
1262
1263                 for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
1264                         if (Config->get_auto_input() && (*i)->record_enabled ()) {
1265                                 //cerr << "switching from input" << __FILE__ << __LINE__ << endl << endl;
1266                                 (*i)->monitor_input (false);
1267                         }
1268                 }
1269         }
1270 }
1271
1272 void
1273 Session::maybe_enable_record ()
1274 {
1275         g_atomic_int_set (&_record_status, Enabled);
1276
1277         /* this function is currently called from somewhere other than an RT thread.
1278            this save_state() call therefore doesn't impact anything.
1279         */
1280
1281         save_state ("", true);
1282
1283         if (_transport_speed) {
1284                 if (!Config->get_punch_in()) {
1285                         enable_record ();
1286                 }
1287         } else {
1288                 send_mmc_in_another_thread (MIDI::MachineControl::cmdRecordPause);
1289                 RecordStateChanged (); /* EMIT SIGNAL */
1290         }
1291
1292         set_dirty();
1293 }
1294
1295 nframes_t
1296 Session::audible_frame () const
1297 {
1298         nframes_t ret;
1299         nframes_t offset;
1300         nframes_t tf;
1301
1302         /* the first of these two possible settings for "offset"
1303            mean that the audible frame is stationary until
1304            audio emerges from the latency compensation
1305            "pseudo-pipeline".
1306
1307            the second means that the audible frame is stationary
1308            until audio would emerge from a physical port
1309            in the absence of any plugin latency compensation
1310         */
1311
1312         offset = _worst_output_latency;
1313
1314         if (offset > current_block_size) {
1315                 offset -= current_block_size;
1316         } else {
1317                 /* XXX is this correct? if we have no external
1318                    physical connections and everything is internal
1319                    then surely this is zero? still, how
1320                    likely is that anyway?
1321                 */
1322                 offset = current_block_size;
1323         }
1324
1325         if (synced_to_jack()) {
1326                 tf = _engine.transport_frame();
1327         } else {
1328                 tf = _transport_frame;
1329         }
1330
1331         if (_transport_speed == 0) {
1332                 return tf;
1333         }
1334
1335         if (tf < offset) {
1336                 return 0;
1337         }
1338
1339         ret = tf;
1340
1341         if (!non_realtime_work_pending()) {
1342
1343                 /* MOVING */
1344
1345                 /* take latency into account */
1346
1347                 ret -= offset;
1348         }
1349
1350         return ret;
1351 }
1352
1353 void
1354 Session::set_frame_rate (nframes_t frames_per_second)
1355 {
1356         /** \fn void Session::set_frame_size(nframes_t)
1357                 the AudioEngine object that calls this guarantees
1358                 that it will not be called while we are also in
1359                 ::process(). Its fine to do things that block
1360                 here.
1361         */
1362
1363         _base_frame_rate = frames_per_second;
1364
1365         sync_time_vars();
1366
1367         Route::set_automation_interval ((jack_nframes_t) ceil ((double) frames_per_second * 0.25));
1368
1369         // XXX we need some equivalent to this, somehow
1370         // SndFileSource::setup_standard_crossfades (frames_per_second);
1371
1372         set_dirty();
1373
1374         /* XXX need to reset/reinstantiate all LADSPA plugins */
1375 }
1376
1377 void
1378 Session::set_block_size (nframes_t nframes)
1379 {
1380         /* the AudioEngine guarantees
1381            that it will not be called while we are also in
1382            ::process(). It is therefore fine to do things that block
1383            here.
1384         */
1385
1386         {
1387                 vector<Sample*>::iterator i;
1388                 uint32_t np;
1389
1390                 current_block_size = nframes;
1391
1392                 for (np = 0, i = _passthru_buffers.begin(); i != _passthru_buffers.end(); ++i, ++np) {
1393                         free (*i);
1394                 }
1395
1396                 for (vector<Sample*>::iterator i = _silent_buffers.begin(); i != _silent_buffers.end(); ++i) {
1397                         free (*i);
1398                 }
1399
1400                 _passthru_buffers.clear ();
1401                 _silent_buffers.clear ();
1402
1403                 ensure_passthru_buffers (np);
1404
1405                 for (vector<Sample*>::iterator i = _send_buffers.begin(); i != _send_buffers.end(); ++i) {
1406                         free(*i);
1407
1408                         Sample *buf;
1409 #ifdef NO_POSIX_MEMALIGN
1410                         buf = (Sample *) malloc(current_block_size * sizeof(Sample));
1411 #else
1412                         posix_memalign((void **)&buf,16,current_block_size * 4);
1413 #endif
1414                         *i = buf;
1415
1416                         memset (*i, 0, sizeof (Sample) * current_block_size);
1417                 }
1418
1419
1420                 if (_gain_automation_buffer) {
1421                         delete [] _gain_automation_buffer;
1422                 }
1423                 _gain_automation_buffer = new gain_t[nframes];
1424
1425                 allocate_pan_automation_buffers (nframes, _npan_buffers, true);
1426
1427                 boost::shared_ptr<RouteList> r = routes.reader ();
1428
1429                 for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
1430                         (*i)->set_block_size (nframes);
1431                 }
1432
1433                 boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
1434                 for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
1435                         (*i)->set_block_size (nframes);
1436                 }
1437
1438                 set_worst_io_latencies ();
1439         }
1440 }
1441
1442 void
1443 Session::set_default_fade (float steepness, float fade_msecs)
1444 {
1445 #if 0
1446         nframes_t fade_frames;
1447
1448         /* Don't allow fade of less 1 frame */
1449
1450         if (fade_msecs < (1000.0 * (1.0/_current_frame_rate))) {
1451
1452                 fade_msecs = 0;
1453                 fade_frames = 0;
1454
1455         } else {
1456
1457                 fade_frames = (nframes_t) floor (fade_msecs * _current_frame_rate * 0.001);
1458
1459         }
1460
1461         default_fade_msecs = fade_msecs;
1462         default_fade_steepness = steepness;
1463
1464         {
1465                 // jlc, WTF is this!
1466                 Glib::RWLock::ReaderLock lm (route_lock);
1467                 AudioRegion::set_default_fade (steepness, fade_frames);
1468         }
1469
1470         set_dirty();
1471
1472         /* XXX have to do this at some point */
1473         /* foreach region using default fade, reset, then
1474            refill_all_diskstream_buffers ();
1475         */
1476 #endif
1477 }
1478
1479 struct RouteSorter {
1480     bool operator() (boost::shared_ptr<Route> r1, boost::shared_ptr<Route> r2) {
1481             if (r1->fed_by.find (r2) != r1->fed_by.end()) {
1482                     return false;
1483             } else if (r2->fed_by.find (r1) != r2->fed_by.end()) {
1484                     return true;
1485             } else {
1486                     if (r1->fed_by.empty()) {
1487                             if (r2->fed_by.empty()) {
1488                                     /* no ardour-based connections inbound to either route. just use signal order */
1489                                     return r1->order_key(N_("signal")) < r2->order_key(N_("signal"));
1490                             } else {
1491                                     /* r2 has connections, r1 does not; run r1 early */
1492                                     return true;
1493                             }
1494                     } else {
1495                             return r1->order_key(N_("signal")) < r2->order_key(N_("signal"));
1496                     }
1497             }
1498     }
1499 };
1500
1501 static void
1502 trace_terminal (shared_ptr<Route> r1, shared_ptr<Route> rbase)
1503 {
1504         shared_ptr<Route> r2;
1505
1506         if ((r1->fed_by.find (rbase) != r1->fed_by.end()) && (rbase->fed_by.find (r1) != rbase->fed_by.end())) {
1507                 info << string_compose(_("feedback loop setup between %1 and %2"), r1->name(), rbase->name()) << endmsg;
1508                 return;
1509         }
1510
1511         /* make a copy of the existing list of routes that feed r1 */
1512
1513         set<shared_ptr<Route> > existing = r1->fed_by;
1514
1515         /* for each route that feeds r1, recurse, marking it as feeding
1516            rbase as well.
1517         */
1518
1519         for (set<shared_ptr<Route> >::iterator i = existing.begin(); i != existing.end(); ++i) {
1520                 r2 =* i;
1521
1522                 /* r2 is a route that feeds r1 which somehow feeds base. mark
1523                    base as being fed by r2
1524                 */
1525
1526                 rbase->fed_by.insert (r2);
1527
1528                 if (r2 != rbase) {
1529
1530                         /* 2nd level feedback loop detection. if r1 feeds or is fed by r2,
1531                            stop here.
1532                          */
1533
1534                         if ((r1->fed_by.find (r2) != r1->fed_by.end()) && (r2->fed_by.find (r1) != r2->fed_by.end())) {
1535                                 continue;
1536                         }
1537
1538                         /* now recurse, so that we can mark base as being fed by
1539                            all routes that feed r2
1540                         */
1541
1542                         trace_terminal (r2, rbase);
1543                 }
1544
1545         }
1546 }
1547
1548 void
1549 Session::resort_routes ()
1550 {
1551         /* don't do anything here with signals emitted
1552            by Routes while we are being destroyed.
1553         */
1554
1555         if (_state_of_the_state & Deletion) {
1556                 return;
1557         }
1558
1559
1560         {
1561
1562                 RCUWriter<RouteList> writer (routes);
1563                 shared_ptr<RouteList> r = writer.get_copy ();
1564                 resort_routes_using (r);
1565                 /* writer goes out of scope and forces update */
1566         }
1567
1568 }
1569 void
1570 Session::resort_routes_using (shared_ptr<RouteList> r)
1571 {
1572         RouteList::iterator i, j;
1573
1574         for (i = r->begin(); i != r->end(); ++i) {
1575
1576                 (*i)->fed_by.clear ();
1577
1578                 for (j = r->begin(); j != r->end(); ++j) {
1579
1580                         /* although routes can feed themselves, it will
1581                            cause an endless recursive descent if we
1582                            detect it. so don't bother checking for
1583                            self-feeding.
1584                         */
1585
1586                         if (*j == *i) {
1587                                 continue;
1588                         }
1589
1590                         if ((*j)->feeds (*i)) {
1591                                 (*i)->fed_by.insert (*j);
1592                         }
1593                 }
1594         }
1595
1596         for (i = r->begin(); i != r->end(); ++i) {
1597                 trace_terminal (*i, *i);
1598         }
1599
1600         RouteSorter cmp;
1601         r->sort (cmp);
1602
1603         /* don't leave dangling references to routes in Route::fed_by */
1604
1605         for (i = r->begin(); i != r->end(); ++i) {
1606                 (*i)->fed_by.clear ();
1607         }
1608
1609 #if 0
1610         cerr << "finished route resort\n";
1611
1612         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
1613                 cerr << " " << (*i)->name() << " signal order = " << (*i)->order_key ("signal") << endl;
1614         }
1615         cerr << endl;
1616 #endif
1617
1618 }
1619
1620 list<boost::shared_ptr<AudioTrack> >
1621 Session::new_audio_track (int input_channels, int output_channels, TrackMode mode, uint32_t how_many)
1622 {
1623         char track_name[32];
1624         uint32_t track_id = 0;
1625         uint32_t n = 0;
1626         uint32_t channels_used = 0;
1627         string port;
1628         RouteList new_routes;
1629         list<boost::shared_ptr<AudioTrack> > ret;
1630         uint32_t control_id;
1631
1632         /* count existing audio tracks */
1633
1634         {
1635                 shared_ptr<RouteList> r = routes.reader ();
1636
1637                 for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
1638                         if (dynamic_cast<AudioTrack*>((*i).get()) != 0) {
1639                                 if (!(*i)->hidden()) {
1640                                         n++;
1641                                         channels_used += (*i)->n_inputs();
1642                                 }
1643                         }
1644                 }
1645         }
1646
1647         vector<string> physinputs;
1648         vector<string> physoutputs;
1649         uint32_t nphysical_in;
1650         uint32_t nphysical_out;
1651
1652         _engine.get_physical_outputs (physoutputs);
1653         _engine.get_physical_inputs (physinputs);
1654         control_id = ntracks() + nbusses() + 1;
1655
1656         while (how_many) {
1657
1658                 /* check for duplicate route names, since we might have pre-existing
1659                    routes with this name (e.g. create Audio1, Audio2, delete Audio1,
1660                    save, close,restart,add new route - first named route is now
1661                    Audio2)
1662                 */
1663
1664
1665                 do {
1666                         ++track_id;
1667
1668                         snprintf (track_name, sizeof(track_name), "Audio %" PRIu32, track_id);
1669
1670                         if (route_by_name (track_name) == 0) {
1671                                 break;
1672                         }
1673
1674                 } while (track_id < (UINT_MAX-1));
1675
1676                 if (Config->get_input_auto_connect() & AutoConnectPhysical) {
1677                         nphysical_in = min (n_physical_inputs, (uint32_t) physinputs.size());
1678                 } else {
1679                         nphysical_in = 0;
1680                 }
1681
1682                 if (Config->get_output_auto_connect() & AutoConnectPhysical) {
1683                         nphysical_out = min (n_physical_outputs, (uint32_t) physinputs.size());
1684                 } else {
1685                         nphysical_out = 0;
1686                 }
1687
1688                 try {
1689                         shared_ptr<AudioTrack> track (new AudioTrack (*this, track_name, Route::Flag (0), mode));
1690
1691                         if (track->ensure_io (input_channels, output_channels, false, this)) {
1692                                 error << string_compose (_("cannot configure %1 in/%2 out configuration for new audio track"),
1693                                                          input_channels, output_channels)
1694                                       << endmsg;
1695                         }
1696
1697                         if (nphysical_in) {
1698                                 for (uint32_t x = 0; x < track->n_inputs() && x < nphysical_in; ++x) {
1699
1700                                         port = "";
1701
1702                                         if (Config->get_input_auto_connect() & AutoConnectPhysical) {
1703                                                 port = physinputs[(channels_used+x)%nphysical_in];
1704                                         }
1705
1706                                         if (port.length() && track->connect_input (track->input (x), port, this)) {
1707                                                 break;
1708                                         }
1709                                 }
1710                         }
1711
1712                         for (uint32_t x = 0; x < track->n_outputs(); ++x) {
1713
1714                                 port = "";
1715
1716                                 if (nphysical_out && (Config->get_output_auto_connect() & AutoConnectPhysical)) {
1717                                         port = physoutputs[(channels_used+x)%nphysical_out];
1718                                 } else if (Config->get_output_auto_connect() & AutoConnectMaster) {
1719                                         if (_master_out) {
1720                                                 port = _master_out->input (x%_master_out->n_inputs())->name();
1721                                         }
1722                                 }
1723
1724                                 if (port.length() && track->connect_output (track->output (x), port, this)) {
1725                                         break;
1726                                 }
1727                         }
1728
1729                         channels_used += track->n_inputs ();
1730
1731                         if (_control_out) {
1732                                 vector<string> cports;
1733                                 uint32_t ni = _control_out->n_inputs();
1734
1735                                 for (n = 0; n < ni; ++n) {
1736                                         cports.push_back (_control_out->input(n)->name());
1737                                 }
1738
1739                                 track->set_control_outs (cports);
1740                         }
1741
1742                         track->DiskstreamChanged.connect (mem_fun (this, &Session::resort_routes));
1743                         track->set_remote_control_id (control_id);
1744                         ++control_id;
1745
1746                         new_routes.push_back (track);
1747                         ret.push_back (track);
1748                 }
1749
1750                 catch (failed_constructor &err) {
1751                         error << _("Session: could not create new audio track.") << endmsg;
1752                         // XXX should we delete the tracks already created?
1753                         ret.clear ();
1754                         return ret;
1755                 }
1756
1757                 --how_many;
1758         }
1759
1760         if (!new_routes.empty()) {
1761                 add_routes (new_routes, false);
1762                 save_state (_current_snapshot_name);
1763         }
1764
1765         return ret;
1766 }
1767
1768 Session::RouteList
1769 Session::new_audio_route (int input_channels, int output_channels, uint32_t how_many)
1770 {
1771         char bus_name[32];
1772         uint32_t bus_id = 1;
1773         uint32_t n = 0;
1774         string port;
1775         RouteList ret;
1776         uint32_t control_id;
1777
1778         /* count existing audio busses */
1779
1780         {
1781                 shared_ptr<RouteList> r = routes.reader ();
1782
1783                 for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
1784                         if (dynamic_cast<AudioTrack*>((*i).get()) == 0) {
1785                                 if (!(*i)->hidden()) {
1786                                         bus_id++;
1787                                 }
1788                         }
1789                 }
1790         }
1791
1792         vector<string> physinputs;
1793         vector<string> physoutputs;
1794
1795         _engine.get_physical_outputs (physoutputs);
1796         _engine.get_physical_inputs (physinputs);
1797         control_id = ntracks() + nbusses() + 1;
1798
1799         while (how_many) {
1800
1801                 do {
1802                         ++bus_id;
1803
1804                         snprintf (bus_name, sizeof(bus_name), "Bus %" PRIu32, bus_id);
1805
1806                         if (route_by_name (bus_name) == 0) {
1807                                 break;
1808                         }
1809
1810                 } while (bus_id < (UINT_MAX-1));
1811
1812                 try {
1813                         shared_ptr<Route> bus (new Route (*this, bus_name, -1, -1, -1, -1, Route::Flag(0), DataType::AUDIO));
1814
1815                         if (bus->ensure_io (input_channels, output_channels, false, this)) {
1816                                 error << string_compose (_("cannot configure %1 in/%2 out configuration for new audio track"),
1817                                                          input_channels, output_channels)
1818                                       << endmsg;
1819                         }
1820
1821                         for (uint32_t x = 0; n_physical_inputs && x < bus->n_inputs(); ++x) {
1822
1823                                 port = "";
1824
1825                                 if (Config->get_input_auto_connect() & AutoConnectPhysical) {
1826                                                 port = physinputs[((n+x)%n_physical_inputs)];
1827                                 }
1828
1829                                 if (port.length() && bus->connect_input (bus->input (x), port, this)) {
1830                                         break;
1831                                 }
1832                         }
1833
1834                         for (uint32_t x = 0; n_physical_outputs && x < bus->n_outputs(); ++x) {
1835
1836                                 port = "";
1837
1838                                 if (Config->get_output_auto_connect() & AutoConnectPhysical) {
1839                                         port = physoutputs[((n+x)%n_physical_outputs)];
1840                                 } else if (Config->get_output_auto_connect() & AutoConnectMaster) {
1841                                         if (_master_out) {
1842                                                 port = _master_out->input (x%_master_out->n_inputs())->name();
1843                                         }
1844                                 }
1845
1846                                 if (port.length() && bus->connect_output (bus->output (x), port, this)) {
1847                                         break;
1848                                 }
1849                         }
1850
1851                         if (_control_out) {
1852                                 vector<string> cports;
1853                                 uint32_t ni = _control_out->n_inputs();
1854
1855                                 for (uint32_t n = 0; n < ni; ++n) {
1856                                         cports.push_back (_control_out->input(n)->name());
1857                                 }
1858                                 bus->set_control_outs (cports);
1859                         }
1860
1861                         bus->set_remote_control_id (control_id);
1862                         ++control_id;
1863
1864                         ret.push_back (bus);
1865                 }
1866
1867
1868                 catch (failed_constructor &err) {
1869                         error << _("Session: could not create new audio route.") << endmsg;
1870                         ret.clear ();
1871                         return ret;
1872                 }
1873
1874                 --how_many;
1875         }
1876
1877         if (!ret.empty()) {
1878                 add_routes (ret, false);
1879                 save_state (_current_snapshot_name);
1880         }
1881
1882         return ret;
1883
1884 }
1885
1886 void
1887 Session::add_routes (RouteList& new_routes, bool save)
1888 {
1889         {
1890                 RCUWriter<RouteList> writer (routes);
1891                 shared_ptr<RouteList> r = writer.get_copy ();
1892                 r->insert (r->end(), new_routes.begin(), new_routes.end());
1893                 resort_routes_using (r);
1894         }
1895
1896         for (RouteList::iterator x = new_routes.begin(); x != new_routes.end(); ++x) {
1897
1898                 boost::weak_ptr<Route> wpr (*x);
1899
1900                 (*x)->solo_changed.connect (sigc::bind (mem_fun (*this, &Session::route_solo_changed), wpr));
1901                 (*x)->mute_changed.connect (mem_fun (*this, &Session::route_mute_changed));
1902                 (*x)->output_changed.connect (mem_fun (*this, &Session::set_worst_io_latencies_x));
1903                 (*x)->redirects_changed.connect (mem_fun (*this, &Session::update_latency_compensation_proxy));
1904
1905                 if ((*x)->master()) {
1906                         _master_out = (*x);
1907                 }
1908
1909                 if ((*x)->control()) {
1910                         _control_out = (*x);
1911                 }
1912         }
1913
1914         set_dirty();
1915
1916         if (save) {
1917                 save_state (_current_snapshot_name);
1918         }
1919
1920         RouteAdded (new_routes); /* EMIT SIGNAL */
1921 }
1922
1923 void
1924 Session::add_diskstream (boost::shared_ptr<Diskstream> dstream)
1925 {
1926         /* need to do this in case we're rolling at the time, to prevent false underruns */
1927         dstream->do_refill_with_alloc();
1928
1929         {
1930                 RCUWriter<DiskstreamList> writer (diskstreams);
1931                 boost::shared_ptr<DiskstreamList> ds = writer.get_copy();
1932                 ds->push_back (dstream);
1933         }
1934
1935         dstream->set_block_size (current_block_size);
1936
1937         dstream->PlaylistChanged.connect (sigc::bind (mem_fun (*this, &Session::diskstream_playlist_changed), dstream));
1938         /* this will connect to future changes, and check the current length */
1939         diskstream_playlist_changed (dstream);
1940
1941         dstream->prepare ();
1942 }
1943
1944 void
1945 Session::remove_route (shared_ptr<Route> route)
1946 {
1947         {
1948                 RCUWriter<RouteList> writer (routes);
1949                 shared_ptr<RouteList> rs = writer.get_copy ();
1950
1951                 rs->remove (route);
1952
1953                 /* deleting the master out seems like a dumb
1954                    idea, but its more of a UI policy issue
1955                    than our concern.
1956                 */
1957
1958                 if (route == _master_out) {
1959                         _master_out = shared_ptr<Route> ();
1960                 }
1961
1962                 if (route == _control_out) {
1963                         _control_out = shared_ptr<Route> ();
1964
1965                         /* cancel control outs for all routes */
1966
1967                         vector<string> empty;
1968
1969                         for (RouteList::iterator r = rs->begin(); r != rs->end(); ++r) {
1970                                 (*r)->set_control_outs (empty);
1971                         }
1972                 }
1973
1974                 update_route_solo_state ();
1975
1976                 /* writer goes out of scope, forces route list update */
1977         }
1978
1979         // FIXME: audio specific
1980         AudioTrack* at;
1981         boost::shared_ptr<AudioDiskstream> ds;
1982
1983         if ((at = dynamic_cast<AudioTrack*>(route.get())) != 0) {
1984                 ds = at->audio_diskstream();
1985         }
1986
1987         if (ds) {
1988
1989                 {
1990                         RCUWriter<DiskstreamList> dsl (diskstreams);
1991                         boost::shared_ptr<DiskstreamList> d = dsl.get_copy();
1992                         d->remove (ds);
1993                 }
1994         }
1995
1996         find_current_end ();
1997
1998         update_latency_compensation (false, false);
1999         set_dirty();
2000
2001         // We need to disconnect the routes inputs and outputs
2002         route->disconnect_inputs(NULL);
2003         route->disconnect_outputs(NULL);
2004
2005         /* get rid of it from the dead wood collection in the route list manager */
2006
2007         /* XXX i think this is unsafe as it currently stands, but i am not sure. (pd, october 2nd, 2006) */
2008
2009         routes.flush ();
2010
2011         /* try to cause everyone to drop their references */
2012
2013         route->drop_references ();
2014
2015         /* save the new state of the world */
2016
2017         if (save_state (_current_snapshot_name)) {
2018                 save_history (_current_snapshot_name);
2019         }
2020 }
2021
2022 void
2023 Session::route_mute_changed (void* src)
2024 {
2025         set_dirty ();
2026 }
2027
2028 void
2029 Session::route_solo_changed (void* src, boost::weak_ptr<Route> wpr)
2030 {
2031         if (solo_update_disabled) {
2032                 // We know already
2033                 return;
2034         }
2035
2036         bool is_track;
2037         boost::shared_ptr<Route> route = wpr.lock ();
2038
2039         if (!route) {
2040                 /* should not happen */
2041                 error << string_compose (_("programming error: %1"), X_("invalid route weak ptr passed to route_solo_changed")) << endmsg;
2042                 return;
2043         }
2044
2045         is_track = (boost::dynamic_pointer_cast<AudioTrack>(route) != 0);
2046
2047         shared_ptr<RouteList> r = routes.reader ();
2048
2049         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
2050
2051                 /* soloing a track mutes all other tracks, soloing a bus mutes all other busses */
2052
2053                 if (is_track) {
2054
2055                         /* don't mess with busses */
2056
2057                         if (dynamic_cast<AudioTrack*>((*i).get()) == 0) {
2058                                 continue;
2059                         }
2060
2061                 } else {
2062
2063                         /* don't mess with tracks */
2064
2065                         if (dynamic_cast<AudioTrack*>((*i).get()) != 0) {
2066                                 continue;
2067                         }
2068                 }
2069
2070                 if ((*i) != route &&
2071                     ((*i)->mix_group () == 0 ||
2072                      (*i)->mix_group () != route->mix_group () ||
2073                      !route->mix_group ()->is_active())) {
2074
2075                         if ((*i)->soloed()) {
2076
2077                                 /* if its already soloed, and solo latching is enabled,
2078                                    then leave it as it is.
2079                                 */
2080
2081                                 if (Config->get_solo_latched()) {
2082                                         continue;
2083                                 }
2084                         }
2085
2086                         /* do it */
2087
2088                         solo_update_disabled = true;
2089                         (*i)->set_solo (false, src);
2090                         solo_update_disabled = false;
2091                 }
2092         }
2093
2094         bool something_soloed = false;
2095         bool same_thing_soloed = false;
2096         bool signal = false;
2097
2098         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
2099                 if ((*i)->soloed()) {
2100                         something_soloed = true;
2101                         if (dynamic_cast<AudioTrack*>((*i).get())) {
2102                                 if (is_track) {
2103                                         same_thing_soloed = true;
2104                                         break;
2105                                 }
2106                         } else {
2107                                 if (!is_track) {
2108                                         same_thing_soloed = true;
2109                                         break;
2110                                 }
2111                         }
2112                         break;
2113                 }
2114         }
2115
2116         if (something_soloed != currently_soloing) {
2117                 signal = true;
2118                 currently_soloing = something_soloed;
2119         }
2120
2121         modify_solo_mute (is_track, same_thing_soloed);
2122
2123         if (signal) {
2124                 SoloActive (currently_soloing);
2125         }
2126
2127         set_dirty();
2128 }
2129
2130 void
2131 Session::update_route_solo_state ()
2132 {
2133         bool mute = false;
2134         bool is_track = false;
2135         bool signal = false;
2136
2137         /* caller must hold RouteLock */
2138
2139         /* this is where we actually implement solo by changing
2140            the solo mute setting of each track.
2141         */
2142
2143         shared_ptr<RouteList> r = routes.reader ();
2144
2145         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
2146                 if ((*i)->soloed()) {
2147                         mute = true;
2148                         if (dynamic_cast<AudioTrack*>((*i).get())) {
2149                                 is_track = true;
2150                         }
2151                         break;
2152                 }
2153         }
2154
2155         if (mute != currently_soloing) {
2156                 signal = true;
2157                 currently_soloing = mute;
2158         }
2159
2160         if (!is_track && !mute) {
2161
2162                 /* nothing is soloed */
2163
2164                 for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
2165                         (*i)->set_solo_mute (false);
2166                 }
2167
2168                 if (signal) {
2169                         SoloActive (false);
2170                 }
2171
2172                 return;
2173         }
2174
2175         modify_solo_mute (is_track, mute);
2176
2177         if (signal) {
2178                 SoloActive (currently_soloing);
2179         }
2180 }
2181
2182 void
2183 Session::modify_solo_mute (bool is_track, bool mute)
2184 {
2185         shared_ptr<RouteList> r = routes.reader ();
2186
2187         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
2188
2189                 if (is_track) {
2190
2191                         /* only alter track solo mute */
2192
2193                         if (dynamic_cast<AudioTrack*>((*i).get())) {
2194                                 if ((*i)->soloed()) {
2195                                         (*i)->set_solo_mute (!mute);
2196                                 } else {
2197                                         (*i)->set_solo_mute (mute);
2198                                 }
2199                         }
2200
2201                 } else {
2202
2203                         /* only alter bus solo mute */
2204
2205                         if (!dynamic_cast<AudioTrack*>((*i).get())) {
2206
2207                                 if ((*i)->soloed()) {
2208
2209                                         (*i)->set_solo_mute (false);
2210
2211                                 } else {
2212
2213                                         /* don't mute master or control outs
2214                                            in response to another bus solo
2215                                         */
2216
2217                                         if ((*i) != _master_out &&
2218                                             (*i) != _control_out) {
2219                                                 (*i)->set_solo_mute (mute);
2220                                         }
2221                                 }
2222                         }
2223
2224                 }
2225         }
2226 }
2227
2228
2229 void
2230 Session::catch_up_on_solo ()
2231 {
2232         /* this is called after set_state() to catch the full solo
2233            state, which can't be correctly determined on a per-route
2234            basis, but needs the global overview that only the session
2235            has.
2236         */
2237         update_route_solo_state();
2238 }
2239
2240 shared_ptr<Route>
2241 Session::route_by_name (string name)
2242 {
2243         shared_ptr<RouteList> r = routes.reader ();
2244
2245         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
2246                 if ((*i)->name() == name) {
2247                         return *i;
2248                 }
2249         }
2250
2251         return shared_ptr<Route> ((Route*) 0);
2252 }
2253
2254 shared_ptr<Route>
2255 Session::route_by_id (PBD::ID id)
2256 {
2257         shared_ptr<RouteList> r = routes.reader ();
2258
2259         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
2260                 if ((*i)->id() == id) {
2261                         return *i;
2262                 }
2263         }
2264
2265         return shared_ptr<Route> ((Route*) 0);
2266 }
2267
2268 shared_ptr<Route>
2269 Session::route_by_remote_id (uint32_t id)
2270 {
2271         shared_ptr<RouteList> r = routes.reader ();
2272
2273         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
2274                 if ((*i)->remote_control_id() == id) {
2275                         return *i;
2276                 }
2277         }
2278
2279         return shared_ptr<Route> ((Route*) 0);
2280 }
2281
2282 void
2283 Session::find_current_end ()
2284 {
2285         if (_state_of_the_state & Loading) {
2286                 return;
2287         }
2288
2289         nframes_t max = get_maximum_extent ();
2290
2291         if (max > end_location->end()) {
2292                 end_location->set_end (max);
2293                 set_dirty();
2294                 DurationChanged(); /* EMIT SIGNAL */
2295         }
2296 }
2297
2298 nframes_t
2299 Session::get_maximum_extent () const
2300 {
2301         nframes_t max = 0;
2302         nframes_t me;
2303
2304         boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
2305
2306         for (DiskstreamList::const_iterator i = dsl->begin(); i != dsl->end(); ++i) {
2307                 boost::shared_ptr<Playlist> pl = (*i)->playlist();
2308                 if ((me = pl->get_maximum_extent()) > max) {
2309                         max = me;
2310                 }
2311         }
2312
2313         return max;
2314 }
2315
2316 boost::shared_ptr<Diskstream>
2317 Session::diskstream_by_name (string name)
2318 {
2319         boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
2320
2321         for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
2322                 if ((*i)->name() == name) {
2323                         return *i;
2324                 }
2325         }
2326
2327         return boost::shared_ptr<Diskstream>((Diskstream*) 0);
2328 }
2329
2330 boost::shared_ptr<Diskstream>
2331 Session::diskstream_by_id (const PBD::ID& id)
2332 {
2333         boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
2334
2335         for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
2336                 if ((*i)->id() == id) {
2337                         return *i;
2338                 }
2339         }
2340
2341         return boost::shared_ptr<Diskstream>((Diskstream*) 0);
2342 }
2343
2344 /* AudioRegion management */
2345
2346 string
2347 Session::new_region_name (string old)
2348 {
2349         string::size_type last_period;
2350         uint32_t number;
2351         string::size_type len = old.length() + 64;
2352         char buf[len];
2353
2354         if ((last_period = old.find_last_of ('.')) == string::npos) {
2355
2356                 /* no period present - add one explicitly */
2357
2358                 old += '.';
2359                 last_period = old.length() - 1;
2360                 number = 0;
2361
2362         } else {
2363
2364                 number = atoi (old.substr (last_period+1).c_str());
2365
2366         }
2367
2368         while (number < (UINT_MAX-1)) {
2369
2370                 AudioRegionList::const_iterator i;
2371                 string sbuf;
2372
2373                 number++;
2374
2375                 snprintf (buf, len, "%s%" PRIu32, old.substr (0, last_period + 1).c_str(), number);
2376                 sbuf = buf;
2377
2378                 for (i = audio_regions.begin(); i != audio_regions.end(); ++i) {
2379                         if (i->second->name() == sbuf) {
2380                                 break;
2381                         }
2382                 }
2383
2384                 if (i == audio_regions.end()) {
2385                         break;
2386                 }
2387         }
2388
2389         if (number != (UINT_MAX-1)) {
2390                 return buf;
2391         }
2392
2393         error << string_compose (_("cannot create new name for region \"%1\""), old) << endmsg;
2394         return old;
2395 }
2396
2397 int
2398 Session::region_name (string& result, string base, bool newlevel) const
2399 {
2400         char buf[16];
2401         string subbase;
2402
2403         if (base == "") {
2404
2405                 Glib::Mutex::Lock lm (region_lock);
2406
2407                 snprintf (buf, sizeof (buf), "%d", (int)audio_regions.size() + 1);
2408
2409
2410                 result = "region.";
2411                 result += buf;
2412
2413         } else {
2414
2415                 /* XXX this is going to be slow. optimize me later */
2416
2417                 if (newlevel) {
2418                         subbase = base;
2419                 } else {
2420                         string::size_type pos;
2421
2422                         pos = base.find_last_of ('.');
2423
2424                         /* pos may be npos, but then we just use entire base */
2425
2426                         subbase = base.substr (0, pos);
2427
2428                 }
2429
2430                 bool name_taken = true;
2431
2432                 {
2433                         Glib::Mutex::Lock lm (region_lock);
2434
2435                         for (int n = 1; n < 5000; ++n) {
2436
2437                                 result = subbase;
2438                                 snprintf (buf, sizeof (buf), ".%d", n);
2439                                 result += buf;
2440
2441                                 name_taken = false;
2442
2443                                 for (AudioRegionList::const_iterator i = audio_regions.begin(); i != audio_regions.end(); ++i) {
2444                                         if (i->second->name() == result) {
2445                                                 name_taken = true;
2446                                                 break;
2447                                         }
2448                                 }
2449
2450                                 if (!name_taken) {
2451                                         break;
2452                                 }
2453                         }
2454                 }
2455
2456                 if (name_taken) {
2457                         fatal << string_compose(_("too many regions with names like %1"), base) << endmsg;
2458                         /*NOTREACHED*/
2459                 }
2460         }
2461         return 0;
2462 }
2463
2464 void
2465 Session::add_region (boost::shared_ptr<Region> region)
2466 {
2467         boost::shared_ptr<AudioRegion> ar;
2468         boost::shared_ptr<AudioRegion> oar;
2469         bool added = false;
2470
2471         {
2472                 Glib::Mutex::Lock lm (region_lock);
2473
2474                 if ((ar = boost::dynamic_pointer_cast<AudioRegion> (region)) != 0) {
2475
2476                         AudioRegionList::iterator x;
2477
2478                         for (x = audio_regions.begin(); x != audio_regions.end(); ++x) {
2479
2480                                 oar = boost::dynamic_pointer_cast<AudioRegion> (x->second);
2481
2482                                 if (ar->region_list_equivalent (oar)) {
2483                                         break;
2484                                 }
2485                         }
2486
2487                         if (x == audio_regions.end()) {
2488
2489                                 pair<AudioRegionList::key_type,AudioRegionList::mapped_type> entry;
2490
2491                                 entry.first = region->id();
2492                                 entry.second = ar;
2493
2494                                 pair<AudioRegionList::iterator,bool> x = audio_regions.insert (entry);
2495
2496
2497                                 if (!x.second) {
2498                                         return;
2499                                 }
2500
2501                                 added = true;
2502                         }
2503
2504                 } else {
2505
2506                         fatal << _("programming error: ")
2507                               << X_("unknown region type passed to Session::add_region()")
2508                               << endmsg;
2509                         /*NOTREACHED*/
2510
2511                 }
2512         }
2513
2514         /* mark dirty because something has changed even if we didn't
2515            add the region to the region list.
2516         */
2517
2518         set_dirty();
2519
2520         if (added) {
2521                 region->GoingAway.connect (sigc::bind (mem_fun (*this, &Session::remove_region), boost::weak_ptr<Region>(region)));
2522                 region->StateChanged.connect (sigc::bind (mem_fun (*this, &Session::region_changed), boost::weak_ptr<Region>(region)));
2523                 AudioRegionAdded (ar); /* EMIT SIGNAL */
2524         }
2525 }
2526
2527 void
2528 Session::region_changed (Change what_changed, boost::weak_ptr<Region> weak_region)
2529 {
2530         boost::shared_ptr<Region> region (weak_region.lock ());
2531
2532         if (!region) {
2533                 return;
2534         }
2535
2536         if (what_changed & Region::HiddenChanged) {
2537                 /* relay hidden changes */
2538                 RegionHiddenChange (region);
2539         }
2540 }
2541
2542 void
2543 Session::remove_region (boost::weak_ptr<Region> weak_region)
2544 {
2545         AudioRegionList::iterator i;
2546         boost::shared_ptr<Region> region (weak_region.lock ());
2547
2548         if (!region) {
2549                 return;
2550         }
2551
2552         boost::shared_ptr<AudioRegion> ar;
2553         bool removed = false;
2554
2555         {
2556                 Glib::Mutex::Lock lm (region_lock);
2557
2558                 if ((ar = boost::dynamic_pointer_cast<AudioRegion> (region)) != 0) {
2559                         if ((i = audio_regions.find (region->id())) != audio_regions.end()) {
2560                                 audio_regions.erase (i);
2561                                 removed = true;
2562                         }
2563
2564                 } else {
2565
2566                         fatal << _("programming error: ")
2567                               << X_("unknown region type passed to Session::remove_region()")
2568                               << endmsg;
2569                         /*NOTREACHED*/
2570                 }
2571         }
2572
2573         /* mark dirty because something has changed even if we didn't
2574            remove the region from the region list.
2575         */
2576
2577         set_dirty();
2578
2579         if (removed) {
2580                 AudioRegionRemoved (ar); /* EMIT SIGNAL */
2581         }
2582 }
2583
2584 boost::shared_ptr<AudioRegion>
2585 Session::find_whole_file_parent (boost::shared_ptr<AudioRegion const> child)
2586 {
2587         AudioRegionList::iterator i;
2588         boost::shared_ptr<AudioRegion> region;
2589         Glib::Mutex::Lock lm (region_lock);
2590
2591         for (i = audio_regions.begin(); i != audio_regions.end(); ++i) {
2592
2593                 region = i->second;
2594
2595                 if (region->whole_file()) {
2596
2597                         if (child->source_equivalent (region)) {
2598                                 return region;
2599                         }
2600                 }
2601         }
2602
2603         return boost::shared_ptr<AudioRegion> ();
2604 }
2605
2606 void
2607 Session::find_equivalent_playlist_regions (boost::shared_ptr<Region> region, vector<boost::shared_ptr<Region> >& result)
2608 {
2609         for (PlaylistList::iterator i = playlists.begin(); i != playlists.end(); ++i)
2610                 (*i)->get_region_list_equivalent_regions (region, result);
2611 }
2612
2613 int
2614 Session::destroy_region (boost::shared_ptr<Region> region)
2615 {
2616         vector<boost::shared_ptr<Source> > srcs;
2617
2618         {
2619                 boost::shared_ptr<AudioRegion> aregion;
2620
2621                 if ((aregion = boost::dynamic_pointer_cast<AudioRegion> (region)) == 0) {
2622                         return 0;
2623                 }
2624
2625                 if (aregion->playlist()) {
2626                         aregion->playlist()->destroy_region (region);
2627                 }
2628
2629                 for (uint32_t n = 0; n < aregion->n_channels(); ++n) {
2630                         srcs.push_back (aregion->source (n));
2631                 }
2632         }
2633
2634         region->drop_references ();
2635
2636         for (vector<boost::shared_ptr<Source> >::iterator i = srcs.begin(); i != srcs.end(); ++i) {
2637
2638                 if (!(*i)->used()) {
2639                         boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(*i);
2640
2641                         if (afs) {
2642                                 (afs)->mark_for_remove ();
2643                         }
2644
2645                         (*i)->drop_references ();
2646
2647                         cerr << "source was not used by any playlist\n";
2648                 }
2649         }
2650
2651         return 0;
2652 }
2653
2654 int
2655 Session::destroy_regions (list<boost::shared_ptr<Region> > regions)
2656 {
2657         for (list<boost::shared_ptr<Region> >::iterator i = regions.begin(); i != regions.end(); ++i) {
2658                 destroy_region (*i);
2659         }
2660         return 0;
2661 }
2662
2663 int
2664 Session::remove_last_capture ()
2665 {
2666         list<boost::shared_ptr<Region> > r;
2667
2668         boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
2669
2670         for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
2671                 list<boost::shared_ptr<Region> >& l = (*i)->last_capture_regions();
2672
2673                 if (!l.empty()) {
2674                         r.insert (r.end(), l.begin(), l.end());
2675                         l.clear ();
2676                 }
2677         }
2678
2679         destroy_regions (r);
2680         return 0;
2681 }
2682
2683 int
2684 Session::remove_region_from_region_list (boost::shared_ptr<Region> r)
2685 {
2686         remove_region (r);
2687         return 0;
2688 }
2689
2690 /* Source Management */
2691
2692 void
2693 Session::add_source (boost::shared_ptr<Source> source)
2694 {
2695         boost::shared_ptr<AudioFileSource> afs;
2696
2697         if ((afs = boost::dynamic_pointer_cast<AudioFileSource>(source)) != 0) {
2698
2699                 pair<AudioSourceList::key_type, AudioSourceList::mapped_type> entry;
2700                 pair<AudioSourceList::iterator,bool> result;
2701
2702                 entry.first = source->id();
2703                 entry.second = afs;
2704
2705                 {
2706                         Glib::Mutex::Lock lm (audio_source_lock);
2707                         result = audio_sources.insert (entry);
2708                 }
2709
2710                 if (result.second) {
2711                         source->GoingAway.connect (sigc::bind (mem_fun (this, &Session::remove_source), boost::weak_ptr<Source> (source)));
2712                         set_dirty();
2713                 }
2714
2715         }
2716 }
2717
2718 void
2719 Session::remove_source (boost::weak_ptr<Source> src)
2720 {
2721         AudioSourceList::iterator i;
2722         boost::shared_ptr<Source> source = src.lock();
2723
2724         if (!source) {
2725                 return;
2726         }
2727
2728         {
2729                 Glib::Mutex::Lock lm (audio_source_lock);
2730
2731                 if ((i = audio_sources.find (source->id())) != audio_sources.end()) {
2732                         audio_sources.erase (i);
2733                 }
2734         }
2735
2736         if (!_state_of_the_state & InCleanup) {
2737
2738                 /* save state so we don't end up with a session file
2739                    referring to non-existent sources.
2740                 */
2741
2742                 save_state (_current_snapshot_name);
2743         }
2744 }
2745
2746 boost::shared_ptr<Source>
2747 Session::source_by_id (const PBD::ID& id)
2748 {
2749         Glib::Mutex::Lock lm (audio_source_lock);
2750         AudioSourceList::iterator i;
2751         boost::shared_ptr<Source> source;
2752
2753         if ((i = audio_sources.find (id)) != audio_sources.end()) {
2754                 source = i->second;
2755         }
2756
2757         /* XXX search MIDI or other searches here */
2758
2759         return source;
2760 }
2761
2762 string
2763 Session::peak_path_from_audio_path (string audio_path) const
2764 {
2765         string res;
2766
2767         res = peak_dir ();
2768         res += PBD::basename_nosuffix (audio_path);
2769         res += ".peak";
2770
2771         return res;
2772 }
2773
2774 string
2775 Session::change_audio_path_by_name (string path, string oldname, string newname, bool destructive)
2776 {
2777         string look_for;
2778         string old_basename = PBD::basename_nosuffix (oldname);
2779         string new_legalized = legalize_for_path (newname);
2780
2781         /* note: we know (or assume) the old path is already valid */
2782
2783         if (destructive) {
2784
2785                 /* destructive file sources have a name of the form:
2786
2787                     /path/to/Tnnnn-NAME(%[LR])?.wav
2788
2789                     the task here is to replace NAME with the new name.
2790                 */
2791
2792                 /* find last slash */
2793
2794                 string dir;
2795                 string prefix;
2796                 string::size_type slash;
2797                 string::size_type dash;
2798
2799                 if ((slash = path.find_last_of ('/')) == string::npos) {
2800                         return "";
2801                 }
2802
2803                 dir = path.substr (0, slash+1);
2804
2805                 /* '-' is not a legal character for the NAME part of the path */
2806
2807                 if ((dash = path.find_last_of ('-')) == string::npos) {
2808                         return "";
2809                 }
2810
2811                 prefix = path.substr (slash+1, dash-(slash+1));
2812
2813                 path = dir;
2814                 path += prefix;
2815                 path += '-';
2816                 path += new_legalized;
2817                 path += ".wav";  /* XXX gag me with a spoon */
2818
2819         } else {
2820
2821                 /* non-destructive file sources have a name of the form:
2822
2823                     /path/to/NAME-nnnnn(%[LR])?.wav
2824
2825                     the task here is to replace NAME with the new name.
2826                 */
2827
2828                 string dir;
2829                 string suffix;
2830                 string::size_type slash;
2831                 string::size_type dash;
2832                 string::size_type postfix;
2833
2834                 /* find last slash */
2835
2836                 if ((slash = path.find_last_of ('/')) == string::npos) {
2837                         return "";
2838                 }
2839
2840                 dir = path.substr (0, slash+1);
2841
2842                 /* '-' is not a legal character for the NAME part of the path */
2843
2844                 if ((dash = path.find_last_of ('-')) == string::npos) {
2845                         return "";
2846                 }
2847
2848                 suffix = path.substr (dash+1);
2849
2850                 // Suffix is now everything after the dash. Now we need to eliminate
2851                 // the nnnnn part, which is done by either finding a '%' or a '.'
2852
2853                 postfix = suffix.find_last_of ("%");
2854                 if (postfix == string::npos) {
2855                         postfix = suffix.find_last_of ('.');
2856                 }
2857
2858                 if (postfix != string::npos) {
2859                         suffix = suffix.substr (postfix);
2860                 } else {
2861                         error << "Logic error in Session::change_audio_path_by_name(), please report to the developers" << endl;
2862                         return "";
2863                 }
2864
2865                 const uint32_t limit = 10000;
2866                 char buf[PATH_MAX+1];
2867
2868                 for (uint32_t cnt = 1; cnt <= limit; ++cnt) {
2869
2870                         snprintf (buf, sizeof(buf), "%s%s-%u%s", dir.c_str(), newname.c_str(), cnt, suffix.c_str());
2871
2872                         if (access (buf, F_OK) != 0) {
2873                                 path = buf;
2874                                 break;
2875                         }
2876                         path = "";
2877                 }
2878
2879                 if (path == "") {
2880                         error << "FATAL ERROR! Could not find a " << endl;
2881                 }
2882
2883         }
2884
2885         return path;
2886 }
2887
2888 string
2889 Session::audio_path_from_name (string name, uint32_t nchan, uint32_t chan, bool destructive)
2890 {
2891         string spath;
2892         uint32_t cnt;
2893         char buf[PATH_MAX+1];
2894         const uint32_t limit = 10000;
2895         string legalized;
2896
2897         buf[0] = '\0';
2898         legalized = legalize_for_path (name);
2899
2900         /* find a "version" of the file name that doesn't exist in
2901            any of the possible directories.
2902         */
2903
2904         for (cnt = (destructive ? ++destructive_index : 1); cnt <= limit; ++cnt) {
2905
2906                 vector<space_and_path>::iterator i;
2907                 uint32_t existing = 0;
2908
2909                 for (i = session_dirs.begin(); i != session_dirs.end(); ++i) {
2910
2911                         spath = (*i).path;
2912
2913                         spath += sound_dir (false);
2914
2915                         if (destructive) {
2916                                 if (nchan < 2) {
2917                                         snprintf (buf, sizeof(buf), "%s/T%04d-%s.wav", spath.c_str(), cnt, legalized.c_str());
2918                                 } else if (nchan == 2) {
2919                                         if (chan == 0) {
2920                                                 snprintf (buf, sizeof(buf), "%s/T%04d-%s%%L.wav", spath.c_str(), cnt, legalized.c_str());
2921                                         } else {
2922                                                 snprintf (buf, sizeof(buf), "%s/T%04d-%s%%R.wav", spath.c_str(), cnt, legalized.c_str());
2923                                         }
2924                                 } else if (nchan < 26) {
2925                                         snprintf (buf, sizeof(buf), "%s/T%04d-%s%%%c.wav", spath.c_str(), cnt, legalized.c_str(), 'a' + chan);
2926                                 } else {
2927                                         snprintf (buf, sizeof(buf), "%s/T%04d-%s.wav", spath.c_str(), cnt, legalized.c_str());
2928                                 }
2929
2930                         } else {
2931
2932                                 spath += '/';
2933                                 spath += legalized;
2934
2935                                 if (nchan < 2) {
2936                                         snprintf (buf, sizeof(buf), "%s-%u.wav", spath.c_str(), cnt);
2937                                 } else if (nchan == 2) {
2938                                         if (chan == 0) {
2939                                                 snprintf (buf, sizeof(buf), "%s-%u%%L.wav", spath.c_str(), cnt);
2940                                         } else {
2941                                                 snprintf (buf, sizeof(buf), "%s-%u%%R.wav", spath.c_str(), cnt);
2942                                         }
2943                                 } else if (nchan < 26) {
2944                                         snprintf (buf, sizeof(buf), "%s-%u%%%c.wav", spath.c_str(), cnt, 'a' + chan);
2945                                 } else {
2946                                         snprintf (buf, sizeof(buf), "%s-%u.wav", spath.c_str(), cnt);
2947                                 }
2948                         }
2949
2950                         if (g_file_test (buf, G_FILE_TEST_EXISTS)) {
2951                                 existing++;
2952                         }
2953
2954                 }
2955
2956                 if (existing == 0) {
2957                         break;
2958                 }
2959
2960                 if (cnt > limit) {
2961                         error << string_compose(_("There are already %1 recordings for %2, which I consider too many."), limit, name) << endmsg;
2962                         destroy ();
2963                         throw failed_constructor();
2964                 }
2965         }
2966
2967         /* we now have a unique name for the file, but figure out where to
2968            actually put it.
2969         */
2970
2971         string foo = buf;
2972
2973         spath = discover_best_sound_dir ();
2974         spath += '/';
2975
2976         string::size_type pos = foo.find_last_of ('/');
2977
2978         if (pos == string::npos) {
2979                 spath += foo;
2980         } else {
2981                 spath += foo.substr (pos + 1);
2982         }
2983
2984         return spath;
2985 }
2986
2987 boost::shared_ptr<AudioFileSource>
2988 Session::create_audio_source_for_session (AudioDiskstream& ds, uint32_t chan, bool destructive)
2989 {
2990         string spath = audio_path_from_name (ds.name(), ds.n_channels(), chan, destructive);
2991         return boost::dynamic_pointer_cast<AudioFileSource> (SourceFactory::createWritable (*this, spath, destructive, frame_rate()));
2992 }
2993
2994 /* Playlist management */
2995
2996 boost::shared_ptr<Playlist>
2997 Session::playlist_by_name (string name)
2998 {
2999         Glib::Mutex::Lock lm (playlist_lock);
3000         for (PlaylistList::iterator i = playlists.begin(); i != playlists.end(); ++i) {
3001                 if ((*i)->name() == name) {
3002                         return* i;
3003                 }
3004         }
3005         for (PlaylistList::iterator i = unused_playlists.begin(); i != unused_playlists.end(); ++i) {
3006                 if ((*i)->name() == name) {
3007                         return* i;
3008                 }
3009         }
3010
3011         return boost::shared_ptr<Playlist>();
3012 }
3013
3014 void
3015 Session::add_playlist (boost::shared_ptr<Playlist> playlist)
3016 {
3017         if (playlist->hidden()) {
3018                 return;
3019         }
3020
3021         {
3022                 Glib::Mutex::Lock lm (playlist_lock);
3023                 if (find (playlists.begin(), playlists.end(), playlist) == playlists.end()) {
3024                         playlists.insert (playlists.begin(), playlist);
3025                         playlist->InUse.connect (sigc::bind (mem_fun (*this, &Session::track_playlist), boost::weak_ptr<Playlist>(playlist)));
3026                         playlist->GoingAway.connect (sigc::bind (mem_fun (*this, &Session::remove_playlist), boost::weak_ptr<Playlist>(playlist)));
3027                 }
3028         }
3029
3030         set_dirty();
3031
3032         PlaylistAdded (playlist); /* EMIT SIGNAL */
3033 }
3034
3035 void
3036 Session::get_playlists (vector<boost::shared_ptr<Playlist> >& s)
3037 {
3038         {
3039                 Glib::Mutex::Lock lm (playlist_lock);
3040                 for (PlaylistList::iterator i = playlists.begin(); i != playlists.end(); ++i) {
3041                         s.push_back (*i);
3042                 }
3043                 for (PlaylistList::iterator i = unused_playlists.begin(); i != unused_playlists.end(); ++i) {
3044                         s.push_back (*i);
3045                 }
3046         }
3047 }
3048
3049 void
3050 Session::track_playlist (bool inuse, boost::weak_ptr<Playlist> wpl)
3051 {
3052         boost::shared_ptr<Playlist> pl(wpl.lock());
3053
3054         if (!pl) {
3055                 return;
3056         }
3057
3058         PlaylistList::iterator x;
3059
3060         if (pl->hidden()) {
3061                 /* its not supposed to be visible */
3062                 return;
3063         }
3064
3065         {
3066                 Glib::Mutex::Lock lm (playlist_lock);
3067
3068                 if (!inuse) {
3069
3070                         unused_playlists.insert (pl);
3071
3072                         if ((x = playlists.find (pl)) != playlists.end()) {
3073                                 playlists.erase (x);
3074                         }
3075
3076
3077                 } else {
3078
3079                         playlists.insert (pl);
3080
3081                         if ((x = unused_playlists.find (pl)) != unused_playlists.end()) {
3082                                 unused_playlists.erase (x);
3083                         }
3084                 }
3085         }
3086 }
3087
3088 void
3089 Session::remove_playlist (boost::weak_ptr<Playlist> weak_playlist)
3090 {
3091         if (_state_of_the_state & Deletion) {
3092                 return;
3093         }
3094
3095         boost::shared_ptr<Playlist> playlist (weak_playlist.lock());
3096
3097         if (!playlist) {
3098                 return;
3099         }
3100
3101         {
3102                 Glib::Mutex::Lock lm (playlist_lock);
3103
3104                 PlaylistList::iterator i;
3105
3106                 i = find (playlists.begin(), playlists.end(), playlist);
3107                 if (i != playlists.end()) {
3108                         playlists.erase (i);
3109                 }
3110
3111                 i = find (unused_playlists.begin(), unused_playlists.end(), playlist);
3112                 if (i != unused_playlists.end()) {
3113                         unused_playlists.erase (i);
3114                 }
3115
3116         }
3117
3118         set_dirty();
3119
3120         PlaylistRemoved (playlist); /* EMIT SIGNAL */
3121 }
3122
3123 void
3124 Session::set_audition (boost::shared_ptr<Region> r)
3125 {
3126         pending_audition_region = r;
3127         post_transport_work = PostTransportWork (post_transport_work | PostTransportAudition);
3128         schedule_butler_transport_work ();
3129 }
3130
3131 void
3132 Session::audition_playlist ()
3133 {
3134         Event* ev = new Event (Event::Audition, Event::Add, Event::Immediate, 0, 0.0);
3135         ev->region.reset ();
3136         queue_event (ev);
3137 }
3138
3139 void
3140 Session::non_realtime_set_audition ()
3141 {
3142         if (!pending_audition_region) {
3143                 auditioner->audition_current_playlist ();
3144         } else {
3145                 auditioner->audition_region (pending_audition_region);
3146                 pending_audition_region.reset ();
3147         }
3148         AuditionActive (true); /* EMIT SIGNAL */
3149 }
3150
3151 void
3152 Session::audition_region (boost::shared_ptr<Region> r)
3153 {
3154         Event* ev = new Event (Event::Audition, Event::Add, Event::Immediate, 0, 0.0);
3155         ev->region = r;
3156         queue_event (ev);
3157 }
3158
3159 void
3160 Session::cancel_audition ()
3161 {
3162         if (auditioner->active()) {
3163                 auditioner->cancel_audition ();
3164                 AuditionActive (false); /* EMIT SIGNAL */
3165         }
3166 }
3167
3168 bool
3169 Session::RoutePublicOrderSorter::operator() (boost::shared_ptr<Route> a, boost::shared_ptr<Route> b)
3170 {
3171         return a->order_key(N_("signal")) < b->order_key(N_("signal"));
3172 }
3173
3174 void
3175 Session::remove_empty_sounds ()
3176 {
3177         PathScanner scanner;
3178
3179         vector<string *>* possible_audiofiles = scanner (sound_dir(), "\\.(wav|aiff|caf|w64)$", false, true);
3180
3181         Glib::Mutex::Lock lm (audio_source_lock);
3182
3183         regex_t compiled_tape_track_pattern;
3184         int err;
3185
3186         if ((err = regcomp (&compiled_tape_track_pattern, "/T[0-9][0-9][0-9][0-9]-", REG_EXTENDED|REG_NOSUB))) {
3187
3188                 char msg[256];
3189
3190                 regerror (err, &compiled_tape_track_pattern, msg, sizeof (msg));
3191
3192                 error << string_compose (_("Cannot compile tape track regexp for use (%1)"), msg) << endmsg;
3193                 return;
3194         }
3195
3196         for (vector<string *>::iterator i = possible_audiofiles->begin(); i != possible_audiofiles->end(); ++i) {
3197
3198                 /* never remove files that appear to be a tape track */
3199
3200                 if (regexec (&compiled_tape_track_pattern, (*i)->c_str(), 0, 0, 0) == 0) {
3201                         delete *i;
3202                         continue;
3203                 }
3204
3205                 if (AudioFileSource::is_empty (*this, *(*i))) {
3206
3207                         unlink ((*i)->c_str());
3208
3209                         string peak_path = peak_path_from_audio_path (**i);
3210                         unlink (peak_path.c_str());
3211                 }
3212
3213                 delete* i;
3214         }
3215
3216         delete possible_audiofiles;
3217 }
3218
3219 bool
3220 Session::is_auditioning () const
3221 {
3222         /* can be called before we have an auditioner object */
3223         if (auditioner) {
3224                 return auditioner->active();
3225         } else {
3226                 return false;
3227         }
3228 }
3229
3230 void
3231 Session::set_all_solo (bool yn)
3232 {
3233         shared_ptr<RouteList> r = routes.reader ();
3234
3235         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
3236                 if (!(*i)->hidden()) {
3237                         (*i)->set_solo (yn, this);
3238                 }
3239         }
3240
3241         set_dirty();
3242 }
3243
3244 void
3245 Session::set_all_mute (bool yn)
3246 {
3247         shared_ptr<RouteList> r = routes.reader ();
3248
3249         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
3250                 if (!(*i)->hidden()) {
3251                         (*i)->set_mute (yn, this);
3252                 }
3253         }
3254
3255         set_dirty();
3256 }
3257
3258 uint32_t
3259 Session::n_diskstreams () const
3260 {
3261         uint32_t n = 0;
3262
3263         boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
3264
3265         for (DiskstreamList::const_iterator i = dsl->begin(); i != dsl->end(); ++i) {
3266                 if (!(*i)->hidden()) {
3267                         n++;
3268                 }
3269         }
3270         return n;
3271 }
3272
3273 void
3274 Session::graph_reordered ()
3275 {
3276         /* don't do this stuff if we are setting up connections
3277            from a set_state() call.
3278         */
3279
3280         if (_state_of_the_state & InitialConnecting) {
3281                 return;
3282         }
3283
3284         /* every track/bus asked for this to be handled but it was deferred because
3285            we were connecting. do it now.
3286         */
3287
3288         request_input_change_handling ();
3289
3290         resort_routes ();
3291
3292         /* force all diskstreams to update their capture offset values to
3293            reflect any changes in latencies within the graph.
3294         */
3295
3296         boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
3297
3298         for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
3299                 (*i)->set_capture_offset ();
3300         }
3301 }
3302
3303 void
3304 Session::record_disenable_all ()
3305 {
3306         record_enable_change_all (false);
3307 }
3308
3309 void
3310 Session::record_enable_all ()
3311 {
3312         record_enable_change_all (true);
3313 }
3314
3315 void
3316 Session::record_enable_change_all (bool yn)
3317 {
3318         shared_ptr<RouteList> r = routes.reader ();
3319
3320         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
3321                 AudioTrack* at;
3322
3323                 if ((at = dynamic_cast<AudioTrack*>((*i).get())) != 0) {
3324                         at->set_record_enable (yn, this);
3325                 }
3326         }
3327
3328         /* since we don't keep rec-enable state, don't mark session dirty */
3329 }
3330
3331 void
3332 Session::add_redirect (Redirect* redirect)
3333 {
3334         Send* send;
3335         Insert* insert;
3336         PortInsert* port_insert;
3337         PluginInsert* plugin_insert;
3338
3339         if ((insert = dynamic_cast<Insert *> (redirect)) != 0) {
3340                 if ((port_insert = dynamic_cast<PortInsert *> (insert)) != 0) {
3341                         _port_inserts.insert (_port_inserts.begin(), port_insert);
3342                 } else if ((plugin_insert = dynamic_cast<PluginInsert *> (insert)) != 0) {
3343                         _plugin_inserts.insert (_plugin_inserts.begin(), plugin_insert);
3344                 } else {
3345                         fatal << _("programming error: unknown type of Insert created!") << endmsg;
3346                         /*NOTREACHED*/
3347                 }
3348         } else if ((send = dynamic_cast<Send *> (redirect)) != 0) {
3349                 _sends.insert (_sends.begin(), send);
3350         } else {
3351                 fatal << _("programming error: unknown type of Redirect created!") << endmsg;
3352                 /*NOTREACHED*/
3353         }
3354
3355         redirect->GoingAway.connect (sigc::bind (mem_fun (*this, &Session::remove_redirect), redirect));
3356
3357         set_dirty();
3358 }
3359
3360 void
3361 Session::remove_redirect (Redirect* redirect)
3362 {
3363         Send* send;
3364         Insert* insert;
3365         PortInsert* port_insert;
3366         PluginInsert* plugin_insert;
3367
3368         if ((insert = dynamic_cast<Insert *> (redirect)) != 0) {
3369                 if ((port_insert = dynamic_cast<PortInsert *> (insert)) != 0) {
3370                         list<PortInsert*>::iterator x = find (_port_inserts.begin(), _port_inserts.end(), port_insert);
3371                         if (x != _port_inserts.end()) {
3372                                 insert_bitset[port_insert->bit_slot()] = false;
3373                                 _port_inserts.erase (x);
3374                         }
3375                 } else if ((plugin_insert = dynamic_cast<PluginInsert *> (insert)) != 0) {
3376                         _plugin_inserts.remove (plugin_insert);
3377                 } else {
3378                         fatal << string_compose (_("programming error: %1"),
3379                                                  X_("unknown type of Insert deleted!"))
3380                               << endmsg;
3381                         /*NOTREACHED*/
3382                 }
3383         } else if ((send = dynamic_cast<Send *> (redirect)) != 0) {
3384                 list<Send*>::iterator x = find (_sends.begin(), _sends.end(), send);
3385                 if (x != _sends.end()) {
3386                         send_bitset[send->bit_slot()] = false;
3387                         _sends.erase (x);
3388                 }
3389         } else {
3390                 fatal << _("programming error: unknown type of Redirect deleted!") << endmsg;
3391                 /*NOTREACHED*/
3392         }
3393
3394         set_dirty();
3395 }
3396
3397 nframes_t
3398 Session::available_capture_duration ()
3399 {
3400         float sample_bytes_on_disk;
3401
3402         switch (Config->get_native_file_data_format()) {
3403         case FormatFloat:
3404                 sample_bytes_on_disk = 4;
3405                 break;
3406
3407         case FormatInt24:
3408                 sample_bytes_on_disk = 3;
3409                 break;
3410
3411         default:
3412                 /* impossible, but keep some gcc versions happy */
3413                 fatal << string_compose (_("programming error: %1"),
3414                                          X_("illegal native file data format"))
3415                       << endmsg;
3416                 /*NOTREACHED*/
3417         }
3418
3419         double scale = 4096.0 / sample_bytes_on_disk;
3420
3421         if (_total_free_4k_blocks * scale > (double) max_frames) {
3422                 return max_frames;
3423         }
3424
3425         return (nframes_t) floor (_total_free_4k_blocks * scale);
3426 }
3427
3428 void
3429 Session::add_connection (ARDOUR::Connection* connection)
3430 {
3431         {
3432                 Glib::Mutex::Lock guard (connection_lock);
3433                 _connections.push_back (connection);
3434         }
3435
3436         ConnectionAdded (connection); /* EMIT SIGNAL */
3437
3438         set_dirty();
3439 }
3440
3441 void
3442 Session::remove_connection (ARDOUR::Connection* connection)
3443 {
3444         bool removed = false;
3445
3446         {
3447                 Glib::Mutex::Lock guard (connection_lock);
3448                 ConnectionList::iterator i = find (_connections.begin(), _connections.end(), connection);
3449
3450                 if (i != _connections.end()) {
3451                         _connections.erase (i);
3452                         removed = true;
3453                 }
3454         }
3455
3456         if (removed) {
3457                  ConnectionRemoved (connection); /* EMIT SIGNAL */
3458         }
3459
3460         set_dirty();
3461 }
3462
3463 ARDOUR::Connection *
3464 Session::connection_by_name (string name) const
3465 {
3466         Glib::Mutex::Lock lm (connection_lock);
3467
3468         for (ConnectionList::const_iterator i = _connections.begin(); i != _connections.end(); ++i) {
3469                 if ((*i)->name() == name) {
3470                         return* i;
3471                 }
3472         }
3473
3474         return 0;
3475 }
3476
3477 void
3478 Session::tempo_map_changed (Change ignored)
3479 {
3480         clear_clicks ();
3481         set_dirty ();
3482 }
3483
3484 void
3485 Session::ensure_passthru_buffers (uint32_t howmany)
3486 {
3487         while (howmany > _passthru_buffers.size()) {
3488                 Sample *p;
3489 #ifdef NO_POSIX_MEMALIGN
3490                 p =  (Sample *) malloc(current_block_size * sizeof(Sample));
3491 #else
3492                 posix_memalign((void **)&p,16,current_block_size * 4);
3493 #endif
3494                 _passthru_buffers.push_back (p);
3495
3496                 *p = 0;
3497
3498 #ifdef NO_POSIX_MEMALIGN
3499                 p =  (Sample *) malloc(current_block_size * sizeof(Sample));
3500 #else
3501                 posix_memalign((void **)&p,16,current_block_size * 4);
3502 #endif
3503                 memset (p, 0, sizeof (Sample) * current_block_size);
3504                 _silent_buffers.push_back (p);
3505
3506                 *p = 0;
3507
3508 #ifdef NO_POSIX_MEMALIGN
3509                 p =  (Sample *) malloc(current_block_size * sizeof(Sample));
3510 #else
3511                 posix_memalign((void **)&p,16,current_block_size * 4);
3512 #endif
3513                 memset (p, 0, sizeof (Sample) * current_block_size);
3514                 _send_buffers.push_back (p);
3515
3516         }
3517         allocate_pan_automation_buffers (current_block_size, howmany, false);
3518 }
3519
3520 uint32_t
3521 Session::next_insert_id ()
3522 {
3523         /* this doesn't really loop forever. just think about it */
3524
3525         while (true) {
3526                 for (boost::dynamic_bitset<uint32_t>::size_type n = 0; n < insert_bitset.size(); ++n) {
3527                         if (!insert_bitset[n]) {
3528                                 insert_bitset[n] = true;
3529                                 cerr << "Returning " << n << " as insert ID\n";
3530                                 return n;
3531
3532                         }
3533                 }
3534
3535                 /* none available, so resize and try again */
3536
3537                 insert_bitset.resize (insert_bitset.size() + 16, false);
3538         }
3539 }
3540
3541 uint32_t
3542 Session::next_send_id ()
3543 {
3544         /* this doesn't really loop forever. just think about it */
3545
3546         while (true) {
3547                 for (boost::dynamic_bitset<uint32_t>::size_type n = 0; n < send_bitset.size(); ++n) {
3548                         if (!send_bitset[n]) {
3549                                 send_bitset[n] = true;
3550                                 cerr << "Returning " << n << " as send ID\n";
3551                                 return n;
3552
3553                         }
3554                 }
3555
3556                 /* none available, so resize and try again */
3557
3558                 send_bitset.resize (send_bitset.size() + 16, false);
3559         }
3560 }
3561
3562 void
3563 Session::mark_send_id (uint32_t id)
3564 {
3565         if (id >= send_bitset.size()) {
3566                 send_bitset.resize (id+16, false);
3567         }
3568         if (send_bitset[id]) {
3569                 warning << string_compose (_("send ID %1 appears to be in use already"), id) << endmsg;
3570         }
3571         send_bitset[id] = true;
3572 }
3573
3574 void
3575 Session::mark_insert_id (uint32_t id)
3576 {
3577         if (id >= insert_bitset.size()) {
3578                 insert_bitset.resize (id+16, false);
3579         }
3580         if (insert_bitset[id]) {
3581                 warning << string_compose (_("insert ID %1 appears to be in use already"), id) << endmsg;
3582         }
3583         insert_bitset[id] = true;
3584 }
3585
3586 /* Named Selection management */
3587
3588 NamedSelection *
3589 Session::named_selection_by_name (string name)
3590 {
3591         Glib::Mutex::Lock lm (named_selection_lock);
3592         for (NamedSelectionList::iterator i = named_selections.begin(); i != named_selections.end(); ++i) {
3593                 if ((*i)->name == name) {
3594                         return* i;
3595                 }
3596         }
3597         return 0;
3598 }
3599
3600 void
3601 Session::add_named_selection (NamedSelection* named_selection)
3602 {
3603         {
3604                 Glib::Mutex::Lock lm (named_selection_lock);
3605                 named_selections.insert (named_selections.begin(), named_selection);
3606         }
3607
3608         for (list<boost::shared_ptr<Playlist> >::iterator i = named_selection->playlists.begin(); i != named_selection->playlists.end(); ++i) {
3609                 add_playlist (*i);
3610         }
3611
3612         set_dirty();
3613
3614         NamedSelectionAdded (); /* EMIT SIGNAL */
3615 }
3616
3617 void
3618 Session::remove_named_selection (NamedSelection* named_selection)
3619 {
3620         bool removed = false;
3621
3622         {
3623                 Glib::Mutex::Lock lm (named_selection_lock);
3624
3625                 NamedSelectionList::iterator i = find (named_selections.begin(), named_selections.end(), named_selection);
3626
3627                 if (i != named_selections.end()) {
3628                         delete (*i);
3629                         named_selections.erase (i);
3630                         set_dirty();
3631                         removed = true;
3632                 }
3633         }
3634
3635         if (removed) {
3636                  NamedSelectionRemoved (); /* EMIT SIGNAL */
3637         }
3638 }
3639
3640 void
3641 Session::reset_native_file_format ()
3642 {
3643         boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
3644
3645         for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
3646                 (*i)->reset_write_sources (false);
3647         }
3648 }
3649
3650 bool
3651 Session::route_name_unique (string n) const
3652 {
3653         shared_ptr<RouteList> r = routes.reader ();
3654
3655         for (RouteList::const_iterator i = r->begin(); i != r->end(); ++i) {
3656                 if ((*i)->name() == n) {
3657                         return false;
3658                 }
3659         }
3660
3661         return true;
3662 }
3663
3664 uint32_t
3665 Session::n_playlists () const
3666 {
3667         Glib::Mutex::Lock lm (playlist_lock);
3668         return playlists.size();
3669 }
3670
3671 void
3672 Session::allocate_pan_automation_buffers (nframes_t nframes, uint32_t howmany, bool force)
3673 {
3674         if (!force && howmany <= _npan_buffers) {
3675                 return;
3676         }
3677
3678         if (_pan_automation_buffer) {
3679
3680                 for (uint32_t i = 0; i < _npan_buffers; ++i) {
3681                         delete [] _pan_automation_buffer[i];
3682                 }
3683
3684                 delete [] _pan_automation_buffer;
3685         }
3686
3687         _pan_automation_buffer = new pan_t*[howmany];
3688
3689         for (uint32_t i = 0; i < howmany; ++i) {
3690                 _pan_automation_buffer[i] = new pan_t[nframes];
3691         }
3692
3693         _npan_buffers = howmany;
3694 }
3695
3696 int
3697 Session::freeze (InterThreadInfo& itt)
3698 {
3699         shared_ptr<RouteList> r = routes.reader ();
3700
3701         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
3702
3703                 AudioTrack *at;
3704
3705                 if ((at = dynamic_cast<AudioTrack*>((*i).get())) != 0) {
3706                         /* XXX this is wrong because itt.progress will keep returning to zero at the start
3707                            of every track.
3708                         */
3709                         at->freeze (itt);
3710                 }
3711         }
3712
3713         return 0;
3714 }
3715
3716 int
3717 Session::write_one_audio_track (AudioTrack& track, nframes_t start, nframes_t len,
3718                                bool overwrite, vector<boost::shared_ptr<AudioSource> >& srcs, InterThreadInfo& itt)
3719 {
3720         int ret = -1;
3721         boost::shared_ptr<Playlist> playlist;
3722         boost::shared_ptr<AudioFileSource> fsource;
3723         uint32_t x;
3724         char buf[PATH_MAX+1];
3725         string dir;
3726         uint32_t nchans;
3727         nframes_t position;
3728         nframes_t this_chunk;
3729         nframes_t to_do;
3730         vector<Sample*> buffers;
3731
3732         // any bigger than this seems to cause stack overflows in called functions
3733         const nframes_t chunk_size = (128 * 1024)/4;
3734
3735         g_atomic_int_set (&processing_prohibited, 1);
3736
3737         /* call tree *MUST* hold route_lock */
3738
3739         if ((playlist = track.diskstream()->playlist()) == 0) {
3740                 goto out;
3741         }
3742
3743         /* external redirects will be a problem */
3744
3745         if (track.has_external_redirects()) {
3746                 goto out;
3747         }
3748
3749         nchans = track.audio_diskstream()->n_channels();
3750
3751         dir = discover_best_sound_dir ();
3752
3753         for (uint32_t chan_n=0; chan_n < nchans; ++chan_n) {
3754
3755                 for (x = 0; x < 99999; ++x) {
3756                         snprintf (buf, sizeof(buf), "%s/%s-%d-bounce-%" PRIu32 ".wav", dir.c_str(), playlist->name().c_str(), chan_n, x+1);
3757                         if (access (buf, F_OK) != 0) {
3758                                 break;
3759                         }
3760                 }
3761
3762                 if (x == 99999) {
3763                         error << string_compose (_("too many bounced versions of playlist \"%1\""), playlist->name()) << endmsg;
3764                         goto out;
3765                 }
3766
3767                 try {
3768                         fsource = boost::dynamic_pointer_cast<AudioFileSource> (SourceFactory::createWritable (*this, buf, false, frame_rate()));
3769                 }
3770
3771                 catch (failed_constructor& err) {
3772                         error << string_compose (_("cannot create new audio file \"%1\" for %2"), buf, track.name()) << endmsg;
3773                         goto out;
3774                 }
3775
3776                 srcs.push_back (fsource);
3777         }
3778
3779         /* XXX need to flush all redirects */
3780
3781         position = start;
3782         to_do = len;
3783
3784         /* create a set of reasonably-sized buffers */
3785
3786         for (vector<Sample*>::iterator i = _passthru_buffers.begin(); i != _passthru_buffers.end(); ++i) {
3787                 Sample* b;
3788 #ifdef NO_POSIX_MEMALIGN
3789                 b =  (Sample *) malloc(chunk_size * sizeof(Sample));
3790 #else
3791                 posix_memalign((void **)&b,16,chunk_size * 4);
3792 #endif
3793                 buffers.push_back (b);
3794         }
3795
3796         while (to_do && !itt.cancel) {
3797
3798                 this_chunk = min (to_do, chunk_size);
3799
3800                 if (track.export_stuff (buffers, nchans, start, this_chunk)) {
3801                         goto out;
3802                 }
3803
3804                 uint32_t n = 0;
3805                 for (vector<boost::shared_ptr<AudioSource> >::iterator src=srcs.begin(); src != srcs.end(); ++src, ++n) {
3806                         boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(*src);
3807
3808                         if (afs) {
3809                                 if (afs->write (buffers[n], this_chunk) != this_chunk) {
3810                                         goto out;
3811                                 }
3812                         }
3813                 }
3814
3815                 start += this_chunk;
3816                 to_do -= this_chunk;
3817
3818                 itt.progress = (float) (1.0 - ((double) to_do / len));
3819
3820         }
3821
3822         if (!itt.cancel) {
3823
3824                 time_t now;
3825                 struct tm* xnow;
3826                 time (&now);
3827                 xnow = localtime (&now);
3828
3829                 for (vector<boost::shared_ptr<AudioSource> >::iterator src=srcs.begin(); src != srcs.end(); ++src) {
3830                         boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(*src);
3831
3832                         if (afs) {
3833                                 afs->update_header (position, *xnow, now);
3834                         }
3835                 }
3836
3837                 /* build peakfile for new source */
3838
3839                 for (vector<boost::shared_ptr<AudioSource> >::iterator src=srcs.begin(); src != srcs.end(); ++src) {
3840                         boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(*src);
3841                         if (afs) {
3842                                 afs->build_peaks ();
3843                         }
3844                 }
3845
3846                 /* construct a region to represent the bounced material */
3847
3848                 boost::shared_ptr<Region> aregion = RegionFactory::create (srcs, 0, srcs.front()->length(),
3849                                                                            region_name_from_path (srcs.front()->name(), true));
3850
3851                 ret = 0;
3852         }
3853
3854   out:
3855         if (ret) {
3856                 for (vector<boost::shared_ptr<AudioSource> >::iterator src = srcs.begin(); src != srcs.end(); ++src) {
3857                         boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource>(*src);
3858
3859                         if (afs) {
3860                                 afs->mark_for_remove ();
3861                         }
3862
3863                         (*src)->drop_references ();
3864                 }
3865         }
3866
3867         for (vector<Sample*>::iterator i = buffers.begin(); i != buffers.end(); ++i) {
3868                 free(*i);
3869         }
3870
3871         g_atomic_int_set (&processing_prohibited, 0);
3872
3873         itt.done = true;
3874
3875         return ret;
3876 }
3877
3878 vector<Sample*>&
3879 Session::get_silent_buffers (uint32_t howmany)
3880 {
3881         for (uint32_t i = 0; i < howmany; ++i) {
3882                 memset (_silent_buffers[i], 0, sizeof (Sample) * current_block_size);
3883         }
3884         return _silent_buffers;
3885 }
3886
3887 uint32_t
3888 Session::ntracks () const
3889 {
3890         uint32_t n = 0;
3891         shared_ptr<RouteList> r = routes.reader ();
3892
3893         for (RouteList::const_iterator i = r->begin(); i != r->end(); ++i) {
3894                 if (dynamic_cast<AudioTrack*> ((*i).get())) {
3895                         ++n;
3896                 }
3897         }
3898
3899         return n;
3900 }
3901
3902 uint32_t
3903 Session::nbusses () const
3904 {
3905         uint32_t n = 0;
3906         shared_ptr<RouteList> r = routes.reader ();
3907
3908         for (RouteList::const_iterator i = r->begin(); i != r->end(); ++i) {
3909                 if (dynamic_cast<AudioTrack*> ((*i).get()) == 0) {
3910                         ++n;
3911                 }
3912         }
3913
3914         return n;
3915 }
3916
3917 void
3918 Session::add_automation_list(AutomationList *al)
3919 {
3920         automation_lists[al->id()] = al;
3921 }
3922
3923 nframes_t
3924 Session::compute_initial_length ()
3925 {
3926         return _engine.frame_rate() * 60 * 5;
3927 }
3928