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