libs/ardour/audio_track.cc

   1 /*
   2     Copyright (C) 2002 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 #include <pbd/error.h>
  21 #include <sigc++/retype.h>
  22 #include <sigc++/retype_return.h>
  23 #include <sigc++/bind.h>
  24
  25 #include <ardour/audio_track.h>
  26 #include <ardour/audio_diskstream.h>
  27 #include <ardour/session.h>
  28 #include <ardour/redirect.h>
  29 #include <ardour/audioregion.h>
  30 #include <ardour/audiosource.h>
  31 #include <ardour/route_group_specialized.h>
  32 #include <ardour/insert.h>
  33 #include <ardour/audioplaylist.h>
  34 #include <ardour/panner.h>
  35 #include <ardour/utils.h>
  36
  37 #include "i18n.h"
  38
  39 using namespace std;
  40 using namespace ARDOUR;
  41 using namespace PBD;
  42
  43 AudioTrack::AudioTrack (Session& sess, string name, Route::Flag flag, TrackMode mode)
  44         : Route (sess, name, 1, -1, -1, -1, flag),
  45           diskstream (0),
  46           _rec_enable_control (*this)
  47 {
  48         AudioDiskstream::Flag dflags = AudioDiskstream::Flag (0);
  49
  50         if (_flags & Hidden) {
  51                 dflags = AudioDiskstream::Flag (dflags | AudioDiskstream::Hidden);
  52         } else {
  53                 dflags = AudioDiskstream::Flag (dflags | AudioDiskstream::Recordable);
  54         }
  55
  56         if (mode == Destructive) {
  57                 dflags = AudioDiskstream::Flag (dflags | AudioDiskstream::Destructive);
  58         }
  59
  60         AudioDiskstream* ds = new AudioDiskstream (_session, name, dflags);
  61
  62         _declickable = true;
  63         _freeze_record.state = NoFreeze;
  64         _saved_meter_point = _meter_point;
  65         _mode = mode;
  66
  67         set_diskstream (*ds, this);
  68 }
  69
  70 AudioTrack::AudioTrack (Session& sess, const XMLNode& node)
  71         : Route (sess, "to be renamed", 0, 0, -1, -1),
  72           diskstream (0),
  73           _rec_enable_control (*this)
  74 {
  75         _freeze_record.state = NoFreeze;
  76         set_state (node);
  77         _declickable = true;
  78         _saved_meter_point = _meter_point;
  79 }
  80
  81 AudioTrack::~AudioTrack ()
  82 {
  83         if (diskstream) {
  84                 diskstream->unref();
  85         }
  86 }
  87
  88 int
  89 AudioTrack::deprecated_use_diskstream_connections ()
  90 {
  91         if (diskstream->deprecated_io_node == 0) {
  92                 return 0;
  93         }
  94
  95         const XMLProperty* prop;
  96         XMLNode& node (*diskstream->deprecated_io_node);
  97
  98         /* don't do this more than once. */
  99
 100         diskstream->deprecated_io_node = 0;
 101
 102         set_input_minimum (-1);
 103         set_input_maximum (-1);
 104         set_output_minimum (-1);
 105         set_output_maximum (-1);
 106
 107         if ((prop = node.property ("gain")) != 0) {
 108                 set_gain (atof (prop->value().c_str()), this);
 109                 _gain = _desired_gain;
 110         }
 111
 112         if ((prop = node.property ("input-connection")) != 0) {
 113                 Connection* c = _session.connection_by_name (prop->value());
 114
 115                 if (c == 0) {
 116                         error << string_compose(_("Unknown connection \"%1\" listed for input of %2"), prop->value(), _name) << endmsg;
 117
 118                         if ((c = _session.connection_by_name (_("in 1"))) == 0) {
 119                                 error << _("No input connections available as a replacement")
 120                                 << endmsg;
 121                                 return -1;
 122                         } else {
 123                                 info << string_compose (_("Connection %1 was not available - \"in 1\" used instead"), prop->value())
 124                                << endmsg;
 125                         }
 126                 }
 127
 128                 use_input_connection (*c, this);
 129
 130         } else if ((prop = node.property ("inputs")) != 0) {
 131                 if (set_inputs (prop->value())) {
 132                         error << string_compose(_("improper input channel list in XML node (%1)"), prop->value()) << endmsg;
 133                         return -1;
 134                 }
 135         }
 136
 137         return 0;
 138 }
 139
 140 int
 141 AudioTrack::set_diskstream (AudioDiskstream& ds, void *src)
 142 {
 143         if (diskstream) {
 144                 diskstream->unref();
 145         }
 146
 147         diskstream = &ds.ref();
 148         diskstream->set_io (*this);
 149         diskstream->set_destructive (_mode == Destructive);
 150
 151         if (diskstream->deprecated_io_node) {
 152
 153                 if (!connecting_legal) {
 154                         ConnectingLegal.connect (mem_fun (*this, &AudioTrack::deprecated_use_diskstream_connections));
 155                 } else {
 156                         deprecated_use_diskstream_connections ();
 157                 }
 158         }
 159
 160         diskstream->set_record_enabled (false, this);
 161         diskstream->monitor_input (false);
 162
 163         ic_connection.disconnect();
 164         ic_connection = input_changed.connect (mem_fun (*diskstream, &AudioDiskstream::handle_input_change));
 165
 166         diskstream_changed (src); /* EMIT SIGNAL */
 167
 168         return 0;
 169 }
 170
 171 int
 172 AudioTrack::use_diskstream (string name)
 173 {
 174         AudioDiskstream *dstream;
 175
 176         if ((dstream = _session.diskstream_by_name (name)) == 0) {
 177           error << string_compose(_("AudioTrack: diskstream \"%1\" not known by session"), name) << endmsg;
 178                 return -1;
 179         }
 180
 181         return set_diskstream (*dstream, this);
 182 }
 183
 184 int
 185 AudioTrack::use_diskstream (const PBD::ID& id)
 186 {
 187         AudioDiskstream *dstream;
 188
 189         if ((dstream = _session.diskstream_by_id (id)) == 0) {
 190                 error << string_compose(_("AudioTrack: diskstream \"%1\" not known by session"), id) << endmsg;
 191                 return -1;
 192         }
 193
 194         return set_diskstream (*dstream, this);
 195 }
 196
 197 bool
 198 AudioTrack::record_enabled () const
 199 {
 200         return diskstream->record_enabled ();
 201 }
 202
 203 void
 204 AudioTrack::set_record_enable (bool yn, void *src)
 205 {
 206         if (_freeze_record.state == Frozen) {
 207                 return;
 208         }
 209
 210         if (_mix_group && src != _mix_group && _mix_group->is_active()) {
 211                 _mix_group->apply (&AudioTrack::set_record_enable, yn, _mix_group);
 212                 return;
 213         }
 214
 215         /* keep track of the meter point as it was before we rec-enabled */
 216
 217         if (!diskstream->record_enabled()) {
 218                 _saved_meter_point = _meter_point;
 219         }
 220
 221         diskstream->set_record_enabled (yn, src);
 222
 223         if (diskstream->record_enabled()) {
 224                 set_meter_point (MeterInput, this);
 225         } else {
 226                 set_meter_point (_saved_meter_point, this);
 227         }
 228
 229         _rec_enable_control.Changed ();
 230 }
 231
 232 void
 233 AudioTrack::set_meter_point (MeterPoint p, void *src)
 234 {
 235         Route::set_meter_point (p, src);
 236 }
 237
 238 int
 239 AudioTrack::set_state (const XMLNode& node)
 240 {
 241         const XMLProperty *prop;
 242         XMLNodeConstIterator iter;
 243
 244         if (Route::set_state (node)) {
 245                 return -1;
 246         }
 247
 248         if ((prop = node.property (X_("mode"))) != 0) {
 249                 if (prop->value() == X_("normal")) {
 250                         _mode = Normal;
 251                 } else if (prop->value() == X_("destructive")) {
 252                         _mode = Destructive;
 253                 } else {
 254                         warning << string_compose ("unknown audio track mode \"%1\" seen and ignored", prop->value()) << endmsg;
 255                         _mode = Normal;
 256                 }
 257         } else {
 258                 _mode = Normal;
 259         }
 260
 261         if ((prop = node.property ("diskstream-id")) == 0) {
 262
 263                 /* some old sessions use the diskstream name rather than the ID */
 264
 265                 if ((prop = node.property ("diskstream")) == 0) {
 266                         fatal << _("programming error: AudioTrack given state without diskstream!") << endmsg;
 267                         /*NOTREACHED*/
 268                         return -1;
 269                 }
 270
 271                 if (use_diskstream (prop->value())) {
 272                         return -1;
 273                 }
 274
 275         } else {
 276
 277                 PBD::ID id (prop->value());
 278
 279                 if (use_diskstream (id)) {
 280                         return -1;
 281                 }
 282         }
 283
 284
 285         XMLNodeList nlist;
 286         XMLNodeConstIterator niter;
 287         XMLNode *child;
 288
 289         nlist = node.children();
 290         for (niter = nlist.begin(); niter != nlist.end(); ++niter){
 291                 child = *niter;
 292
 293                 if (child->name() == X_("remote_control")) {
 294                         if ((prop = child->property (X_("id"))) != 0) {
 295                                 int32_t x;
 296                                 sscanf (prop->value().c_str(), "%d", &x);
 297                                 set_remote_control_id (x);
 298                         }
 299                 }
 300         }
 301
 302         pending_state = const_cast<XMLNode*> (&node);
 303
 304         _session.StateReady.connect (mem_fun (*this, &AudioTrack::set_state_part_two));
 305
 306         return 0;
 307 }
 308
 309 XMLNode&
 310 AudioTrack::get_template ()
 311 {
 312         return state (false);
 313 }
 314
 315 XMLNode&
 316 AudioTrack::get_state ()
 317 {
 318         return state (true);
 319 }
 320
 321 XMLNode&
 322 AudioTrack::state(bool full_state)
 323 {
 324         XMLNode& root (Route::state(full_state));
 325         XMLNode* freeze_node;
 326         char buf[64];
 327
 328         if (_freeze_record.playlist) {
 329                 XMLNode* inode;
 330
 331                 freeze_node = new XMLNode (X_("freeze-info"));
 332                 freeze_node->add_property ("playlist", _freeze_record.playlist->name());
 333                 snprintf (buf, sizeof (buf), "%d", (int) _freeze_record.state);
 334                 freeze_node->add_property ("state", buf);
 335
 336                 for (vector<FreezeRecordInsertInfo*>::iterator i = _freeze_record.insert_info.begin(); i != _freeze_record.insert_info.end(); ++i) {
 337                         inode = new XMLNode (X_("insert"));
 338                         (*i)->id.print (buf);
 339                         inode->add_property (X_("id"), buf);
 340                         inode->add_child_copy ((*i)->state);
 341
 342                         freeze_node->add_child_nocopy (*inode);
 343                 }
 344
 345                 root.add_child_nocopy (*freeze_node);
 346         }
 347
 348         /* Alignment: act as a proxy for the diskstream */
 349
 350         XMLNode* align_node = new XMLNode (X_("alignment"));
 351         switch (diskstream->alignment_style()) {
 352         case ExistingMaterial:
 353                 snprintf (buf, sizeof (buf), X_("existing"));
 354                 break;
 355         case CaptureTime:
 356                 snprintf (buf, sizeof (buf), X_("capture"));
 357                 break;
 358         }
 359         align_node->add_property (X_("style"), buf);
 360         root.add_child_nocopy (*align_node);
 361
 362         XMLNode* remote_control_node = new XMLNode (X_("remote_control"));
 363         snprintf (buf, sizeof (buf), "%d", _remote_control_id);
 364         remote_control_node->add_property (X_("id"), buf);
 365         root.add_child_nocopy (*remote_control_node);
 366
 367         switch (_mode) {
 368         case Normal:
 369                 root.add_property (X_("mode"), X_("normal"));
 370                 break;
 371         case Destructive:
 372                 root.add_property (X_("mode"), X_("destructive"));
 373                 break;
 374         }
 375
 376         /* we don't return diskstream state because we don't
 377            own the diskstream exclusively. control of the diskstream
 378            state is ceded to the Session, even if we create the
 379            diskstream.
 380         */
 381
 382         diskstream->id().print (buf);
 383         root.add_property ("diskstream-id", buf);
 384
 385         return root;
 386 }
 387
 388 void
 389 AudioTrack::set_state_part_two ()
 390 {
 391         XMLNode* fnode;
 392         XMLProperty* prop;
 393         LocaleGuard lg (X_("POSIX"));
 394
 395         /* This is called after all session state has been restored but before
 396            have been made ports and connections are established.
 397         */
 398
 399         if (pending_state == 0) {
 400                 return;
 401         }
 402
 403         if ((fnode = find_named_node (*pending_state, X_("freeze-info"))) != 0) {
 404
 405
 406                 _freeze_record.have_mementos = false;
 407                 _freeze_record.state = Frozen;
 408
 409                 for (vector<FreezeRecordInsertInfo*>::iterator i = _freeze_record.insert_info.begin(); i != _freeze_record.insert_info.end(); ++i) {
 410                         delete *i;
 411                 }
 412                 _freeze_record.insert_info.clear ();
 413
 414                 if ((prop = fnode->property (X_("playlist"))) != 0) {
 415                         Playlist* pl = _session.playlist_by_name (prop->value());
 416                         if (pl) {
 417                                 _freeze_record.playlist = dynamic_cast<AudioPlaylist*> (pl);
 418                         } else {
 419                                 _freeze_record.playlist = 0;
 420                                 _freeze_record.state = NoFreeze;
 421                         return;
 422                         }
 423                 }
 424
 425                 if ((prop = fnode->property (X_("state"))) != 0) {
 426                         _freeze_record.state = (FreezeState) atoi (prop->value().c_str());
 427                 }
 428
 429                 XMLNodeConstIterator citer;
 430                 XMLNodeList clist = fnode->children();
 431
 432                 for (citer = clist.begin(); citer != clist.end(); ++citer) {
 433                         if ((*citer)->name() != X_("insert")) {
 434                                 continue;
 435                         }
 436
 437                         if ((prop = (*citer)->property (X_("id"))) == 0) {
 438                                 continue;
 439                         }
 440
 441                         FreezeRecordInsertInfo* frii = new FreezeRecordInsertInfo (*((*citer)->children().front()));
 442                         frii->insert = 0;
 443                         frii->id = prop->value ();
 444                         _freeze_record.insert_info.push_back (frii);
 445                 }
 446         }
 447
 448         /* Alignment: act as a proxy for the diskstream */
 449
 450         if ((fnode = find_named_node (*pending_state, X_("alignment"))) != 0) {
 451
 452                 if ((prop = fnode->property (X_("style"))) != 0) {
 453                         if (prop->value() == "existing") {
 454                                 diskstream->set_persistent_align_style (ExistingMaterial);
 455                         } else if (prop->value() == "capture") {
 456                                 diskstream->set_persistent_align_style (CaptureTime);
 457                         }
 458                 }
 459         }
 460         return;
 461 }
 462
 463 uint32_t
 464 AudioTrack::n_process_buffers ()
 465 {
 466         return max ((uint32_t) diskstream->n_channels(), redirect_max_outs);
 467 }
 468
 469 void
 470 AudioTrack::passthru_silence (jack_nframes_t start_frame, jack_nframes_t end_frame, jack_nframes_t nframes, jack_nframes_t offset, int declick, bool meter)
 471 {
 472         uint32_t nbufs = n_process_buffers ();
 473         process_output_buffers (_session.get_silent_buffers (nbufs), nbufs, start_frame, end_frame, nframes, offset, true, declick, meter);
 474 }
 475
 476 int
 477 AudioTrack::no_roll (jack_nframes_t nframes, jack_nframes_t start_frame, jack_nframes_t end_frame, jack_nframes_t offset,
 478                      bool session_state_changing, bool can_record, bool rec_monitors_input)
 479 {
 480         if (n_outputs() == 0) {
 481                 return 0;
 482         }
 483
 484         if (!_active) {
 485                 silence (nframes, offset);
 486                 return 0;
 487         }
 488
 489         if (session_state_changing) {
 490
 491                 /* XXX is this safe to do against transport state changes? */
 492
 493                 passthru_silence (start_frame, end_frame, nframes, offset, 0, false);
 494                 return 0;
 495         }
 496
 497         diskstream->check_record_status (start_frame, nframes, can_record);
 498
 499         bool send_silence;
 500
 501         if (_have_internal_generator) {
 502                 /* since the instrument has no input streams,
 503                    there is no reason to send any signal
 504                    into the route.
 505                 */
 506                 send_silence = true;
 507         } else {
 508
 509                 if (_session.get_auto_input()) {
 510                         if (Config->get_use_sw_monitoring()) {
 511                                 send_silence = false;
 512                         } else {
 513                                 send_silence = true;
 514                         }
 515                 } else {
 516                         if (diskstream->record_enabled()) {
 517                                 if (Config->get_use_sw_monitoring()) {
 518                                         send_silence = false;
 519                                 } else {
 520                                         send_silence = true;
 521                                 }
 522                         } else {
 523                                 send_silence = true;
 524                         }
 525                 }
 526         }
 527
 528         apply_gain_automation = false;
 529
 530         if (send_silence) {
 531
 532                 /* if we're sending silence, but we want the meters to show levels for the signal,
 533                    meter right here.
 534                 */
 535
 536                 if (_have_internal_generator) {
 537                         passthru_silence (start_frame, end_frame, nframes, offset, 0, true);
 538                 } else {
 539                         if (_meter_point == MeterInput) {
 540                                 just_meter_input (start_frame, end_frame, nframes, offset);
 541                         }
 542                         passthru_silence (start_frame, end_frame, nframes, offset, 0, false);
 543                 }
 544
 545         } else {
 546
 547                 /* we're sending signal, but we may still want to meter the input.
 548                  */
 549
 550                 passthru (start_frame, end_frame, nframes, offset, 0, (_meter_point == MeterInput));
 551         }
 552
 553         return 0;
 554 }
 555
 556 int
 557 AudioTrack::roll (jack_nframes_t nframes, jack_nframes_t start_frame, jack_nframes_t end_frame, jack_nframes_t offset, int declick,
 558                   bool can_record, bool rec_monitors_input)
 559 {
 560         int dret;
 561         Sample* b;
 562         Sample* tmpb;
 563         jack_nframes_t transport_frame;
 564
 565         {
 566                 Glib::RWLock::ReaderLock lm (redirect_lock, Glib::TRY_LOCK);
 567                 if (lm.locked()) {
 568                         // automation snapshot can also be called from the non-rt context
 569                         // and it uses the redirect list, so we take the lock out here
 570                         automation_snapshot (start_frame);
 571                 }
 572         }
 573
 574         if (n_outputs() == 0 && _redirects.empty()) {
 575                 return 0;
 576         }
 577
 578         if (!_active) {
 579                 silence (nframes, offset);
 580                 return 0;
 581         }
 582
 583         transport_frame = _session.transport_frame();
 584
 585         if ((nframes = check_initial_delay (nframes, offset, transport_frame)) == 0) {
 586                 /* need to do this so that the diskstream sets its
 587                    playback distance to zero, thus causing diskstream::commit
 588                    to do nothing.
 589                 */
 590                 return diskstream->process (transport_frame, 0, 0, can_record, rec_monitors_input);
 591         }
 592
 593         _silent = false;
 594         apply_gain_automation = false;
 595
 596         if ((dret = diskstream->process (transport_frame, nframes, offset, can_record, rec_monitors_input)) != 0) {
 597
 598                 silence (nframes, offset);
 599
 600                 return dret;
 601         }
 602
 603         /* special condition applies */
 604
 605         if (_meter_point == MeterInput) {
 606                 just_meter_input (start_frame, end_frame, nframes, offset);
 607         }
 608
 609         if (diskstream->record_enabled() && !can_record && !_session.get_auto_input()) {
 610
 611                 /* not actually recording, but we want to hear the input material anyway,
 612                    at least potentially (depending on monitoring options)
 613                  */
 614
 615                 passthru (start_frame, end_frame, nframes, offset, 0, true);
 616
 617         } else if ((b = diskstream->playback_buffer(0)) != 0) {
 618
 619                 /*
 620                   XXX is it true that the earlier test on n_outputs()
 621                   means that we can avoid checking it again here? i think
 622                   so, because changing the i/o configuration of an IO
 623                   requires holding the AudioEngine lock, which we hold
 624                   while in the process() tree.
 625                 */
 626
 627
 628                 /* copy the diskstream data to all output buffers */
 629
 630                 vector<Sample*>& bufs = _session.get_passthru_buffers ();
 631                 uint32_t limit = n_process_buffers ();
 632
 633                 uint32_t n;
 634                 uint32_t i;
 635
 636
 637                 for (i = 0, n = 1; i < limit; ++i, ++n) {
 638                         memcpy (bufs[i], b, sizeof (Sample) * nframes);
 639                         if (n < diskstream->n_channels()) {
 640                                 tmpb = diskstream->playback_buffer(n);
 641                                 if (tmpb!=0) {
 642                                         b = tmpb;
 643                                 }
 644                         }
 645                 }
 646
 647                 /* don't waste time with automation if we're recording or we've just stopped (yes it can happen) */
 648
 649                 if (!diskstream->record_enabled() && _session.transport_rolling()) {
 650                         Glib::Mutex::Lock am (automation_lock, Glib::TRY_LOCK);
 651
 652                         if (am.locked() && gain_automation_playback()) {
 653                                 apply_gain_automation = _gain_automation_curve.rt_safe_get_vector (start_frame, end_frame, _session.gain_automation_buffer(), nframes);
 654                         }
 655                 }
 656
 657                 process_output_buffers (bufs, limit, start_frame, end_frame, nframes, offset, (!_session.get_record_enabled() || !_session.get_do_not_record_plugins()), declick, (_meter_point != MeterInput));
 658
 659         } else {
 660                 /* problem with the diskstream; just be quiet for a bit */
 661                 silence (nframes, offset);
 662         }
 663
 664         return 0;
 665 }
 666
 667 int
 668 AudioTrack::silent_roll (jack_nframes_t nframes, jack_nframes_t start_frame, jack_nframes_t end_frame, jack_nframes_t offset,
 669                          bool can_record, bool rec_monitors_input)
 670 {
 671         if (n_outputs() == 0 && _redirects.empty()) {
 672                 return 0;
 673         }
 674
 675         if (!_active) {
 676                 silence (nframes, offset);
 677                 return 0;
 678         }
 679
 680         _silent = true;
 681         apply_gain_automation = false;
 682
 683         silence (nframes, offset);
 684
 685         return diskstream->process (_session.transport_frame() + offset, nframes, offset, can_record, rec_monitors_input);
 686 }
 687
 688 void
 689 AudioTrack::toggle_monitor_input ()
 690 {
 691         for (vector<Port*>::iterator i = _inputs.begin(); i != _inputs.end(); ++i) {
 692                 (*i)->request_monitor_input(!(*i)->monitoring_input());
 693         }
 694 }
 695
 696 int
 697 AudioTrack::set_name (string str, void *src)
 698 {
 699         int ret;
 700
 701         if (record_enabled() && _session.actively_recording()) {
 702                 /* this messes things up if done while recording */
 703                 return -1;
 704         }
 705
 706         if (diskstream->set_name (str, src)) {
 707                 return -1;
 708         }
 709
 710         /* save state so that the statefile fully reflects any filename changes */
 711
 712         if ((ret = IO::set_name (str, src)) == 0) {
 713                 _session.save_state ("");
 714         }
 715         return ret;
 716 }
 717
 718 int
 719 AudioTrack::export_stuff (vector<Sample*>& buffers, char * workbuf, uint32_t nbufs, jack_nframes_t start, jack_nframes_t nframes)
 720 {
 721         gain_t  gain_automation[nframes];
 722         gain_t  gain_buffer[nframes];
 723         float   mix_buffer[nframes];
 724         RedirectList::iterator i;
 725         bool post_fader_work = false;
 726         gain_t this_gain = _gain;
 727         vector<Sample*>::iterator bi;
 728         Sample * b;
 729
 730         Glib::RWLock::ReaderLock rlock (redirect_lock);
 731
 732         if (diskstream->playlist()->read (buffers[0], mix_buffer, gain_buffer, workbuf, start, nframes) != nframes) {
 733                 return -1;
 734         }
 735
 736         uint32_t n=1;
 737         bi = buffers.begin();
 738         b = buffers[0];
 739         ++bi;
 740         for (; bi != buffers.end(); ++bi, ++n) {
 741                 if (n < diskstream->n_channels()) {
 742                         if (diskstream->playlist()->read ((*bi), mix_buffer, gain_buffer, workbuf, start, nframes, n) != nframes) {
 743                                 return -1;
 744                         }
 745                         b = (*bi);
 746                 }
 747                 else {
 748                         /* duplicate last across remaining buffers */
 749                         memcpy ((*bi), b, sizeof (Sample) * nframes);
 750                 }
 751         }
 752
 753
 754         /* note: only run inserts during export. other layers in the machinery
 755            will already have checked that there are no external port inserts.
 756         */
 757
 758         for (i = _redirects.begin(); i != _redirects.end(); ++i) {
 759                 Insert *insert;
 760
 761                 if ((insert = dynamic_cast<Insert*>(*i)) != 0) {
 762                         switch (insert->placement()) {
 763                         case PreFader:
 764                                 insert->run (buffers, nbufs, nframes, 0);
 765                                 break;
 766                         case PostFader:
 767                                 post_fader_work = true;
 768                                 break;
 769                         }
 770                 }
 771         }
 772
 773         if (_gain_automation_curve.automation_state() == Play) {
 774
 775                 _gain_automation_curve.get_vector (start, start + nframes, gain_automation, nframes);
 776
 777                 for (bi = buffers.begin(); bi != buffers.end(); ++bi) {
 778                         Sample *b = *bi;
 779                         for (jack_nframes_t n = 0; n < nframes; ++n) {
 780                                 b[n] *= gain_automation[n];
 781                         }
 782                 }
 783
 784         } else {
 785
 786                 for (bi = buffers.begin(); bi != buffers.end(); ++bi) {
 787                         Sample *b = *bi;
 788                         for (jack_nframes_t n = 0; n < nframes; ++n) {
 789                                 b[n] *= this_gain;
 790                         }
 791                 }
 792         }
 793
 794         if (post_fader_work) {
 795
 796                 for (i = _redirects.begin(); i != _redirects.end(); ++i) {
 797                         PluginInsert *insert;
 798
 799                         if ((insert = dynamic_cast<PluginInsert*>(*i)) != 0) {
 800                                 switch ((*i)->placement()) {
 801                                 case PreFader:
 802                                         break;
 803                                 case PostFader:
 804                                         insert->run (buffers, nbufs, nframes, 0);
 805                                         break;
 806                                 }
 807                         }
 808                 }
 809         }
 810
 811         return 0;
 812 }
 813
 814 void
 815 AudioTrack::set_latency_delay (jack_nframes_t longest_session_latency)
 816 {
 817         Route::set_latency_delay (longest_session_latency);
 818         diskstream->set_roll_delay (_roll_delay);
 819 }
 820
 821 jack_nframes_t
 822 AudioTrack::update_total_latency ()
 823 {
 824         _own_latency = 0;
 825
 826         for (RedirectList::iterator i = _redirects.begin(); i != _redirects.end(); ++i) {
 827                 if ((*i)->active ()) {
 828                         _own_latency += (*i)->latency ();
 829                 }
 830         }
 831
 832         set_port_latency (_own_latency);
 833
 834         return _own_latency;
 835 }
 836
 837 void
 838 AudioTrack::bounce (InterThreadInfo& itt)
 839 {
 840         vector<AudioSource*> srcs;
 841         _session.write_one_audio_track (*this, 0, _session.current_end_frame(), false, srcs, itt);
 842 }
 843
 844
 845 void
 846 AudioTrack::bounce_range (jack_nframes_t start, jack_nframes_t end, InterThreadInfo& itt)
 847 {
 848         vector<AudioSource*> srcs;
 849         _session.write_one_audio_track (*this, start, end, false, srcs, itt);
 850 }
 851
 852 void
 853 AudioTrack::freeze (InterThreadInfo& itt)
 854 {
 855         Insert* insert;
 856         vector<AudioSource*> srcs;
 857         string new_playlist_name;
 858         Playlist* new_playlist;
 859         string dir;
 860         AudioRegion* region;
 861         string region_name;
 862
 863         if ((_freeze_record.playlist = diskstream->playlist()) == 0) {
 864                 return;
 865         }
 866
 867         uint32_t n = 1;
 868
 869         while (n < (UINT_MAX-1)) {
 870
 871                 string candidate;
 872
 873                 candidate = string_compose ("<F%2>%1", _freeze_record.playlist->name(), n);
 874
 875                 if (_session.playlist_by_name (candidate) == 0) {
 876                         new_playlist_name = candidate;
 877                         break;
 878                 }
 879
 880                 ++n;
 881
 882         }
 883
 884         if (n == (UINT_MAX-1)) {
 885           error << string_compose (X_("There Are too many frozen versions of playlist \"%1\""
 886                             " to create another one"), _freeze_record.playlist->name())
 887                << endmsg;
 888                 return;
 889         }
 890
 891         if (_session.write_one_audio_track (*this, 0, _session.current_end_frame(), true, srcs, itt)) {
 892                 return;
 893         }
 894
 895         _freeze_record.insert_info.clear ();
 896         _freeze_record.have_mementos = true;
 897
 898         {
 899                 Glib::RWLock::ReaderLock lm (redirect_lock);
 900
 901                 for (RedirectList::iterator r = _redirects.begin(); r != _redirects.end(); ++r) {
 902
 903                         if ((insert = dynamic_cast<Insert*>(*r)) != 0) {
 904
 905                                 FreezeRecordInsertInfo* frii  = new FreezeRecordInsertInfo ((*r)->get_state());
 906
 907                                 frii->insert = insert;
 908                                 frii->id = insert->id();
 909                                 frii->memento = (*r)->get_memento();
 910
 911                                 _freeze_record.insert_info.push_back (frii);
 912
 913                                 /* now deactivate the insert */
 914
 915                                 insert->set_active (false, this);
 916                         }
 917                 }
 918         }
 919
 920         new_playlist = new AudioPlaylist (_session, new_playlist_name, false);
 921         region_name = new_playlist_name;
 922
 923         /* create a new region from all filesources, keep it private */
 924
 925         region = new AudioRegion (srcs, 0, srcs[0]->length(),
 926                                   region_name, 0,
 927                                   (AudioRegion::Flag) (AudioRegion::WholeFile|AudioRegion::DefaultFlags),
 928                                   false);
 929
 930         new_playlist->set_orig_diskstream_id (diskstream->id());
 931         new_playlist->add_region (*region, 0);
 932         new_playlist->set_frozen (true);
 933         region->set_locked (true);
 934
 935         diskstream->use_playlist (dynamic_cast<AudioPlaylist*>(new_playlist));
 936         diskstream->set_record_enabled (false, this);
 937
 938         _freeze_record.state = Frozen;
 939         FreezeChange(); /* EMIT SIGNAL */
 940 }
 941
 942 void
 943 AudioTrack::unfreeze ()
 944 {
 945         if (_freeze_record.playlist) {
 946                 diskstream->use_playlist (_freeze_record.playlist);
 947
 948                 if (_freeze_record.have_mementos) {
 949
 950                         for (vector<FreezeRecordInsertInfo*>::iterator i = _freeze_record.insert_info.begin(); i != _freeze_record.insert_info.end(); ++i) {
 951                                 (*i)->memento ();
 952                         }
 953
 954                 } else {
 955
 956                         Glib::RWLock::ReaderLock lm (redirect_lock); // should this be a write lock? jlc
 957                         for (RedirectList::iterator i = _redirects.begin(); i != _redirects.end(); ++i) {
 958                                 for (vector<FreezeRecordInsertInfo*>::iterator ii = _freeze_record.insert_info.begin(); ii != _freeze_record.insert_info.end(); ++ii) {
 959                                         if ((*ii)->id == (*i)->id()) {
 960                                                 (*i)->set_state (((*ii)->state));
 961                                                 break;
 962                                         }
 963                                 }
 964                         }
 965                 }
 966
 967                 _freeze_record.playlist = 0;
 968         }
 969
 970         _freeze_record.state = UnFrozen;
 971         FreezeChange (); /* EMIT SIGNAL */
 972 }
 973
 974 AudioTrack::FreezeRecord::~FreezeRecord ()
 975 {
 976         for (vector<FreezeRecordInsertInfo*>::iterator i = insert_info.begin(); i != insert_info.end(); ++i) {
 977                 delete *i;
 978         }
 979 }
 980
 981 AudioTrack::FreezeState
 982 AudioTrack::freeze_state() const
 983 {
 984         return _freeze_record.state;
 985 }
 986
 987 AudioTrack::RecEnableControllable::RecEnableControllable (AudioTrack& s)
 988         : track (s)
 989 {
 990 }
 991
 992 void
 993 AudioTrack::RecEnableControllable::set_value (float val)
 994 {
 995         bool bval = ((val >= 0.5f) ? true: false);
 996         track.set_record_enable (bval, this);
 997 }
 998
 999 float
1000 AudioTrack::RecEnableControllable::get_value (void) const
1001 {
1002         if (track.record_enabled()) { return 1.0f; }
1003         return 0.0f;
1004 }
1005
1006 void
1007 AudioTrack::set_mode (TrackMode m)
1008 {
1009         if (diskstream) {
1010                 if (_mode != m) {
1011                         _mode = m;
1012                         diskstream->set_destructive (m == Destructive);
1013                         ModeChanged();
1014                 }
1015         }
1016 }