libs/ardour/session_process.cc

   1 /*
   2     Copyright (C) 1999-2002 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 */
  19
  20 #include <cmath>
  21 #include <cerrno>
  22 #include <algorithm>
  23 #include <unistd.h>
  24
  25 #include "pbd/error.h"
  26 #include "pbd/enumwriter.h"
  27
  28 #include <glibmm/thread.h>
  29
  30 #include "ardour/ardour.h"
  31 #include "ardour/audioengine.h"
  32 #include "ardour/auditioner.h"
  33 #include "ardour/butler.h"
  34 #include "ardour/debug.h"
  35 #include "ardour/process_thread.h"
  36 #include "ardour/session.h"
  37 #include "ardour/slave.h"
  38 #include "ardour/timestamps.h"
  39 #include "ardour/graph.h"
  40 #include "ardour/audio_port.h"
  41
  42 #include "midi++/manager.h"
  43 #include "midi++/mmc.h"
  44
  45 #include "i18n.h"
  46
  47 using namespace ARDOUR;
  48 using namespace PBD;
  49 using namespace std;
  50
  51 /** Called by the audio engine when there is work to be done with JACK.
  52  * @param nframes Number of frames to process.
  53  */
  54 void
  55 Session::process (pframes_t nframes)
  56 {
  57         MIDI::Manager::instance()->cycle_start(nframes);
  58
  59         _silent = false;
  60
  61         if (processing_blocked()) {
  62                 _silent = true;
  63                 return;
  64         }
  65
  66         if (non_realtime_work_pending()) {
  67                 if (!_butler->transport_work_requested ()) {
  68                         post_transport ();
  69                 }
  70         }
  71
  72         _engine.main_thread()->get_buffers ();
  73
  74         (this->*process_function) (nframes);
  75
  76         _engine.main_thread()->drop_buffers ();
  77
  78         // the ticker is for sending time information like MidiClock
  79         framepos_t transport_frames = transport_frame();
  80         Timecode::BBT_Time transport_bbt;
  81         bbt_time(transport_frames, transport_bbt);
  82         Timecode::Time transport_timecode;
  83         timecode_time(transport_frames, transport_timecode);
  84         tick (transport_frames, transport_bbt, transport_timecode); /* EMIT SIGNAL */
  85
  86         SendFeedback (); /* EMIT SIGNAL */
  87
  88         MIDI::Manager::instance()->cycle_end();
  89 }
  90
  91 int
  92 Session::fail_roll (pframes_t nframes)
  93 {
  94         return no_roll (nframes);
  95 }
  96
  97 int
  98 Session::no_roll (pframes_t nframes)
  99 {
 100         framepos_t end_frame = _transport_frame + nframes; // FIXME: varispeed + no_roll ??
 101         int ret = 0;
 102         bool declick = get_transport_declick_required();
 103         boost::shared_ptr<RouteList> r = routes.reader ();
 104
 105         if (_click_io) {
 106                 _click_io->silence (nframes);
 107         }
 108
 109         if (route_graph->threads_in_use() > 1) {
 110                 DEBUG_TRACE(DEBUG::Graph,"calling graph/no-roll\n");
 111                 route_graph->routes_no_roll( nframes, _transport_frame, end_frame, non_realtime_work_pending(), actively_recording(), declick);
 112         } else {
 113                 for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 114
 115                         if ((*i)->is_hidden()) {
 116                                 continue;
 117                         }
 118
 119                         (*i)->set_pending_declick (declick);
 120
 121                         if ((*i)->no_roll (nframes, _transport_frame, end_frame, non_realtime_work_pending(),
 122                                            actively_recording(), declick)) {
 123                                 error << string_compose(_("Session: error in no roll for %1"), (*i)->name()) << endmsg;
 124                                 ret = -1;
 125                                 break;
 126                         }
 127                 }
 128         }
 129
 130         return ret;
 131 }
 132
 133 int
 134 Session::process_routes (pframes_t nframes, bool& need_butler)
 135 {
 136         bool record_active;
 137         int  declick = get_transport_declick_required();
 138         bool rec_monitors = get_rec_monitors_input();
 139         boost::shared_ptr<RouteList> r = routes.reader ();
 140
 141         if (transport_sub_state & StopPendingCapture) {
 142                 /* force a declick out */
 143                 declick = -1;
 144         }
 145
 146         record_active = actively_recording(); // || (get_record_enabled() && get_punch_in());
 147
 148         const framepos_t start_frame = _transport_frame;
 149         const framepos_t end_frame = _transport_frame + floor (nframes * _transport_speed);
 150
 151         if (route_graph->threads_in_use() > 1) {
 152                 DEBUG_TRACE(DEBUG::Graph,"calling graph/process-routes\n");
 153                 route_graph->process_routes( nframes, start_frame, end_frame, declick, record_active, rec_monitors, need_butler);
 154         } else {
 155
 156                 for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 157
 158                         int ret;
 159
 160                         if ((*i)->is_hidden()) {
 161                                 continue;
 162                         }
 163
 164                         (*i)->set_pending_declick (declick);
 165
 166                         if ((ret = (*i)->roll (nframes, start_frame, end_frame, declick, record_active, rec_monitors, need_butler)) < 0) {
 167                                 stop_transport ();
 168                                 return -1;
 169                         }
 170                 }
 171         }
 172
 173         return 0;
 174 }
 175
 176 int
 177 Session::silent_process_routes (pframes_t nframes, bool& need_butler)
 178 {
 179         bool record_active = actively_recording();
 180         int  declick = get_transport_declick_required();
 181         bool rec_monitors = get_rec_monitors_input();
 182         boost::shared_ptr<RouteList> r = routes.reader ();
 183
 184         if (transport_sub_state & StopPendingCapture) {
 185                 /* force a declick out */
 186                 declick = -1;
 187         }
 188
 189         const framepos_t start_frame = _transport_frame;
 190         const framepos_t end_frame = _transport_frame + lrintf(nframes * _transport_speed);
 191
 192         if (route_graph->threads_in_use() > 1) {
 193                 route_graph->silent_process_routes( nframes, start_frame, end_frame, record_active, rec_monitors, need_butler);
 194         } else {
 195                 for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 196
 197                         int ret;
 198
 199                         if ((*i)->is_hidden()) {
 200                                 continue;
 201                         }
 202
 203                         if ((ret = (*i)->silent_roll (nframes, start_frame, end_frame, record_active, rec_monitors, need_butler)) < 0) {
 204                                 stop_transport ();
 205                                 return -1;
 206                         }
 207                 }
 208         }
 209
 210         return 0;
 211 }
 212
 213 void
 214 Session::get_track_statistics ()
 215 {
 216         float pworst = 1.0f;
 217         float cworst = 1.0f;
 218
 219         boost::shared_ptr<RouteList> rl = routes.reader();
 220         for (RouteList::iterator i = rl->begin(); i != rl->end(); ++i) {
 221
 222                 boost::shared_ptr<Track> tr = boost::dynamic_pointer_cast<Track> (*i);
 223
 224                 if (!tr || tr->hidden()) {
 225                         continue;
 226                 }
 227
 228                 pworst = min (pworst, tr->playback_buffer_load());
 229                 cworst = min (cworst, tr->capture_buffer_load());
 230         }
 231
 232         g_atomic_int_set (&_playback_load, (uint32_t) floor (pworst * 100.0f));
 233         g_atomic_int_set (&_capture_load, (uint32_t) floor (cworst * 100.0f));
 234
 235         if (actively_recording()) {
 236                 set_dirty();
 237         }
 238 }
 239
 240 /** Process callback used when the auditioner is not active */
 241 void
 242 Session::process_with_events (pframes_t nframes)
 243 {
 244         SessionEvent*  ev;
 245         pframes_t      this_nframes;
 246         framepos_t     end_frame;
 247         bool           session_needs_butler = false;
 248         framepos_t     stop_limit;
 249         framecnt_t     frames_moved;
 250
 251         /* make sure the auditioner is silent */
 252
 253         if (auditioner) {
 254                 auditioner->silence (nframes);
 255         }
 256
 257         /* handle any pending events */
 258
 259         while (pending_events.read (&ev, 1) == 1) {
 260                 merge_event (ev);
 261         }
 262
 263         /* if we are not in the middle of a state change,
 264            and there are immediate events queued up,
 265            process them.
 266         */
 267
 268         while (!non_realtime_work_pending() && !immediate_events.empty()) {
 269                 SessionEvent *ev = immediate_events.front ();
 270                 immediate_events.pop_front ();
 271                 process_event (ev);
 272         }
 273
 274         /* Decide on what to do with quarter-frame MTC during this cycle */
 275
 276         bool const was_sending_qf_mtc = _send_qf_mtc;
 277         double const tolerance = Config->get_mtc_qf_speed_tolerance() / 100.0;
 278
 279         if (_transport_speed != 0) {
 280                 _send_qf_mtc = (
 281                         Config->get_send_mtc () &&
 282                         _transport_speed >= (1 - tolerance) &&
 283                         _transport_speed <= (1 + tolerance)
 284                         );
 285
 286                 if (_send_qf_mtc && !was_sending_qf_mtc) {
 287                         /* we will re-start quarter-frame MTC this cycle, so send a full update to set things up */
 288                         _send_timecode_update = true;
 289                 }
 290
 291                 if (Config->get_send_mtc() && !_send_qf_mtc && _pframes_since_last_mtc > (frame_rate () / 4)) {
 292                         /* we're sending MTC, but we're not sending QF MTC at the moment, and it's been
 293                            a quarter of a second since we sent anything at all, so send a full MTC update
 294                            this cycle.
 295                         */
 296                         _send_timecode_update = true;
 297                 }
 298
 299                 _pframes_since_last_mtc += nframes;
 300         }
 301
 302         /* Events caused a transport change (or we re-started sending
 303          * MTC), so send an MTC Full Frame (Timecode) message.  This
 304          * is sent whether rolling or not, to give slaves an idea of
 305          * ardour time on locates (and allow slow slaves to position
 306          * and prepare for rolling)
 307          */
 308         if (_send_timecode_update) {
 309                 send_full_time_code (_transport_frame);
 310         }
 311
 312         if (!process_can_proceed()) {
 313                 _silent = true;
 314                 return;
 315         }
 316
 317         if (events.empty() || next_event == events.end()) {
 318                 process_without_events (nframes);
 319                 return;
 320         }
 321
 322         if (_transport_speed == 1.0) {
 323                 frames_moved = (framecnt_t) nframes;
 324         } else {
 325                 interpolation.set_target_speed (fabs(_target_transport_speed));
 326                 interpolation.set_speed (fabs(_transport_speed));
 327                 frames_moved = (framecnt_t) interpolation.interpolate (0, nframes, 0, 0);
 328         }
 329
 330         end_frame = _transport_frame + frames_moved;
 331
 332         {
 333                 SessionEvent* this_event;
 334                 Events::iterator the_next_one;
 335
 336                 if (!process_can_proceed()) {
 337                         _silent = true;
 338                         return;
 339                 }
 340
 341                 if (!_exporting && _slave) {
 342                         if (!follow_slave (nframes)) {
 343                                 return;
 344                         }
 345                 }
 346
 347                 if (_transport_speed == 0) {
 348                         no_roll (nframes);
 349                         return;
 350                 }
 351
 352                 if (!_exporting && !timecode_transmission_suspended()) {
 353                         send_midi_time_code_for_cycle (_transport_frame, end_frame, nframes);
 354                 }
 355
 356                 if (actively_recording()) {
 357                         stop_limit = max_framepos;
 358                 } else {
 359
 360                         if (Config->get_stop_at_session_end()) {
 361                                 stop_limit = current_end_frame();
 362                         } else {
 363                                 stop_limit = max_framepos;
 364                         }
 365                 }
 366
 367                 if (maybe_stop (stop_limit)) {
 368                         no_roll (nframes);
 369                         return;
 370                 }
 371
 372                 this_event = *next_event;
 373                 the_next_one = next_event;
 374                 ++the_next_one;
 375
 376                 /* yes folks, here it is, the actual loop where we really truly
 377                    process some audio
 378                 */
 379
 380                 while (nframes) {
 381
 382                         this_nframes = nframes; /* real (jack) time relative */
 383                         frames_moved = (framecnt_t) floor (_transport_speed * nframes); /* transport relative */
 384
 385                         /* running an event, position transport precisely to its time */
 386                         if (this_event && this_event->action_frame <= end_frame && this_event->action_frame >= _transport_frame) {
 387                                 /* this isn't quite right for reverse play */
 388                                 frames_moved = (framecnt_t) (this_event->action_frame - _transport_frame);
 389                                 this_nframes = abs (floor(frames_moved / _transport_speed));
 390                         }
 391
 392                         if (this_nframes) {
 393
 394                                 click (_transport_frame, this_nframes);
 395
 396                                 if (process_routes (this_nframes, session_needs_butler)) {
 397                                         fail_roll (nframes);
 398                                         return;
 399                                 }
 400
 401                                 get_track_statistics ();
 402
 403                                 nframes -= this_nframes;
 404
 405                                 if (frames_moved < 0) {
 406                                         decrement_transport_position (-frames_moved);
 407                                 } else {
 408                                         increment_transport_position (frames_moved);
 409                                 }
 410
 411                                 maybe_stop (stop_limit);
 412                                 check_declick_out ();
 413                         }
 414
 415                         _engine.split_cycle (this_nframes);
 416
 417                         /* now handle this event and all others scheduled for the same time */
 418
 419                         while (this_event && this_event->action_frame == _transport_frame) {
 420                                 process_event (this_event);
 421
 422                                 if (the_next_one == events.end()) {
 423                                         this_event = 0;
 424                                 } else {
 425                                         this_event = *the_next_one;
 426                                         ++the_next_one;
 427                                 }
 428                         }
 429
 430                         /* if an event left our state changing, do the right thing */
 431
 432                         if (nframes && non_realtime_work_pending()) {
 433                                 no_roll (nframes);
 434                                 break;
 435                         }
 436
 437                         /* this is necessary to handle the case of seamless looping */
 438                         end_frame = _transport_frame + floor (nframes * _transport_speed);
 439
 440                 }
 441
 442                 set_next_event ();
 443
 444         } /* implicit release of route lock */
 445
 446         if (session_needs_butler) {
 447                 _butler->summon ();
 448         }
 449 }
 450
 451 void
 452 Session::reset_slave_state ()
 453 {
 454         average_slave_delta = 1800;
 455         delta_accumulator_cnt = 0;
 456         have_first_delta_accumulator = false;
 457         _slave_state = Stopped;
 458 }
 459
 460 bool
 461 Session::transport_locked () const
 462 {
 463         Slave* sl = _slave;
 464
 465         if (!locate_pending() && (!config.get_external_sync() || (sl && sl->ok() && sl->locked()))) {
 466                 return true;
 467         }
 468
 469         return false;
 470 }
 471
 472 bool
 473 Session::follow_slave (pframes_t nframes)
 474 {
 475         double slave_speed;
 476         framepos_t slave_transport_frame;
 477         framecnt_t this_delta;
 478         int dir;
 479
 480         if (!_slave->ok()) {
 481                 stop_transport ();
 482                 config.set_external_sync (false);
 483                 goto noroll;
 484         }
 485
 486         _slave->speed_and_position (slave_speed, slave_transport_frame);
 487
 488         DEBUG_TRACE (DEBUG::Slave, string_compose ("Slave position %1 speed %2\n", slave_transport_frame, slave_speed));
 489
 490         if (!_slave->locked()) {
 491                 DEBUG_TRACE (DEBUG::Slave, "slave not locked\n");
 492                 goto noroll;
 493         }
 494
 495         if (slave_transport_frame > _transport_frame) {
 496                 this_delta = slave_transport_frame - _transport_frame;
 497                 dir = 1;
 498         } else {
 499                 this_delta = _transport_frame - slave_transport_frame;
 500                 dir = -1;
 501         }
 502
 503         if (_slave->starting()) {
 504                 slave_speed = 0.0f;
 505         }
 506
 507         if (_slave->is_always_synced() || config.get_timecode_source_is_synced()) {
 508
 509                 /* if the TC source is synced, then we assume that its
 510                    speed is binary: 0.0 or 1.0
 511                 */
 512
 513                 if (slave_speed != 0.0f) {
 514                         slave_speed = 1.0f;
 515                 }
 516
 517         } else {
 518
 519                 /* if we are chasing and the average delta between us and the
 520                    master gets too big, we want to switch to silent
 521                    motion. so keep track of that here.
 522                 */
 523
 524                 if (_slave_state == Running) {
 525                         calculate_moving_average_of_slave_delta(dir, this_delta);
 526                 }
 527         }
 528
 529         track_slave_state (slave_speed, slave_transport_frame, this_delta);
 530
 531         DEBUG_TRACE (DEBUG::Slave, string_compose ("slave state %1 @ %2 speed %3 cur delta %4 avg delta %5\n",
 532                                                    _slave_state, slave_transport_frame, slave_speed, this_delta, average_slave_delta));
 533
 534
 535         if (_slave_state == Running && !_slave->is_always_synced() && !config.get_timecode_source_is_synced()) {
 536
 537                 if (_transport_speed != 0.0f) {
 538
 539                         /*
 540                            note that average_dir is +1 or -1
 541                         */
 542
 543                         float delta;
 544
 545                         if (average_slave_delta == 0) {
 546                                 delta = this_delta;
 547                                 delta *= dir;
 548                         } else {
 549                                 delta = average_slave_delta;
 550                                 delta *= average_dir;
 551                         }
 552
 553 #ifndef NDEBUG
 554                         if (slave_speed != 0.0) {
 555                                 DEBUG_TRACE (DEBUG::Slave, string_compose ("delta = %1 speed = %2 ts = %3 M@%4 S@%5 avgdelta %6\n",
 556                                                                            (int) (dir * this_delta),
 557                                                                            slave_speed,
 558                                                                            _transport_speed,
 559                                                                            _transport_frame,
 560                                                                            slave_transport_frame,
 561                                                                            average_slave_delta));
 562                         }
 563 #endif
 564
 565                         if (_slave->give_slave_full_control_over_transport_speed()) {
 566                                 set_transport_speed (slave_speed, false, false);
 567                                 //std::cout << "set speed = " << slave_speed << "\n";
 568                         } else {
 569                                 float adjusted_speed = slave_speed + (1.5 * (delta /  float(_current_frame_rate)));
 570                                 request_transport_speed (adjusted_speed);
 571                                 DEBUG_TRACE (DEBUG::Slave, string_compose ("adjust using %1 towards %2 ratio %3 current %4 slave @ %5\n",
 572                                                                            delta, adjusted_speed, adjusted_speed/slave_speed, _transport_speed,
 573                                                                            slave_speed));
 574                         }
 575
 576 #if 1
 577                         if ((framecnt_t) abs(average_slave_delta) > _slave->resolution()) {
 578                                 cerr << "average slave delta greater than slave resolution (" << _slave->resolution() << "), going to silent motion\n";
 579                                 goto silent_motion;
 580                         }
 581 #endif
 582                 }
 583         }
 584
 585
 586         if (_slave_state == Running && !non_realtime_work_pending()) {
 587                 /* speed is set, we're locked, and good to go */
 588                 return true;
 589         }
 590
 591   silent_motion:
 592         DEBUG_TRACE (DEBUG::Slave, "silent motion\n")
 593         follow_slave_silently (nframes, slave_speed);
 594
 595   noroll:
 596         /* don't move at all */
 597         DEBUG_TRACE (DEBUG::Slave, "no roll\n")
 598         no_roll (nframes);
 599         return false;
 600 }
 601
 602 void
 603 Session::calculate_moving_average_of_slave_delta (int dir, framecnt_t this_delta)
 604 {
 605         if (delta_accumulator_cnt >= delta_accumulator_size) {
 606                 have_first_delta_accumulator = true;
 607                 delta_accumulator_cnt = 0;
 608         }
 609
 610         if (delta_accumulator_cnt != 0 || this_delta < _current_frame_rate) {
 611                 delta_accumulator[delta_accumulator_cnt++] = (framecnt_t) dir *  (framecnt_t) this_delta;
 612         }
 613
 614         if (have_first_delta_accumulator) {
 615                 average_slave_delta = 0L;
 616                 for (int i = 0; i < delta_accumulator_size; ++i) {
 617                         average_slave_delta += delta_accumulator[i];
 618                 }
 619                 average_slave_delta /= (int32_t) delta_accumulator_size;
 620                 if (average_slave_delta < 0L) {
 621                         average_dir = -1;
 622                         average_slave_delta = abs(average_slave_delta);
 623                 } else {
 624                         average_dir = 1;
 625                 }
 626         }
 627 }
 628
 629 void
 630 Session::track_slave_state (float slave_speed, framepos_t slave_transport_frame, framecnt_t this_delta)
 631 {
 632         if (slave_speed != 0.0f) {
 633
 634                 /* slave is running */
 635
 636                 switch (_slave_state) {
 637                 case Stopped:
 638                         if (_slave->requires_seekahead()) {
 639                                 slave_wait_end = slave_transport_frame + _slave->seekahead_distance ();
 640                                 DEBUG_TRACE (DEBUG::Slave, string_compose ("slave stopped, but running, requires seekahead to %1\n", slave_wait_end));
 641                                 /* we can call locate() here because we are in process context */
 642                                 locate (slave_wait_end, false, false);
 643                                 _slave_state = Waiting;
 644
 645                         } else {
 646
 647                                 _slave_state = Running;
 648
 649                                 Location* al = _locations->auto_loop_location();
 650
 651                                 if (al && play_loop && (slave_transport_frame < al->start() || slave_transport_frame > al->end())) {
 652                                         // cancel looping
 653                                         request_play_loop(false);
 654                                 }
 655
 656                                 if (slave_transport_frame != _transport_frame) {
 657                                         locate (slave_transport_frame, false, false);
 658                                 }
 659                         }
 660                         break;
 661
 662                 case Waiting:
 663                 default:
 664                         break;
 665                 }
 666
 667                 if (_slave_state == Waiting) {
 668
 669                         DEBUG_TRACE (DEBUG::Slave, string_compose ("slave waiting at %1\n", slave_transport_frame));
 670
 671                         if (slave_transport_frame >= slave_wait_end) {
 672
 673                                 DEBUG_TRACE (DEBUG::Slave, string_compose ("slave start at %1 vs %2\n", slave_transport_frame, _transport_frame));
 674
 675                                 _slave_state = Running;
 676
 677                                 /* now perform a "micro-seek" within the disk buffers to realign ourselves
 678                                    precisely with the master.
 679                                 */
 680
 681
 682                                 bool ok = true;
 683                                 framecnt_t frame_delta = slave_transport_frame - _transport_frame;
 684
 685                                 boost::shared_ptr<RouteList> rl = routes.reader();
 686                                 for (RouteList::iterator i = rl->begin(); i != rl->end(); ++i) {
 687                                         boost::shared_ptr<Track> tr = boost::dynamic_pointer_cast<Track> (*i);
 688                                         if (tr && !tr->can_internal_playback_seek (frame_delta)) {
 689                                                 ok = false;
 690                                                 break;
 691                                         }
 692                                 }
 693
 694                                 if (ok) {
 695                                         for (RouteList::iterator i = rl->begin(); i != rl->end(); ++i) {
 696                                                 boost::shared_ptr<Track> tr = boost::dynamic_pointer_cast<Track> (*i);
 697                                                 if (tr) {
 698                                                         tr->internal_playback_seek (frame_delta);
 699                                                 }
 700                                         }
 701                                         _transport_frame += frame_delta;
 702
 703                                 } else {
 704                                         cerr << "cannot micro-seek\n";
 705                                         /* XXX what? */
 706                                 }
 707
 708                                 memset (delta_accumulator, 0, sizeof (int32_t) * delta_accumulator_size);
 709                                 average_slave_delta = 0L;
 710                                 this_delta = 0;
 711                         }
 712                 }
 713
 714                 if (_slave_state == Running && _transport_speed == 0.0f) {
 715                         DEBUG_TRACE (DEBUG::Slave, "slave starts transport\n");
 716                         start_transport ();
 717                 }
 718
 719         } else { // slave_speed is 0
 720
 721                 /* slave has stopped */
 722
 723                 if (_transport_speed != 0.0f) {
 724                         DEBUG_TRACE (DEBUG::Slave, string_compose ("slave stops transport: %1 frame %2 tf %3\n", slave_speed, slave_transport_frame, _transport_frame));
 725                         stop_transport ();
 726                 }
 727
 728                 if (slave_transport_frame != _transport_frame) {
 729                         DEBUG_TRACE (DEBUG::Slave, string_compose ("slave stopped, move to %1\n", slave_transport_frame));
 730                         force_locate (slave_transport_frame, false);
 731                 }
 732
 733                 _slave_state = Stopped;
 734         }
 735 }
 736
 737 void
 738 Session::follow_slave_silently (pframes_t nframes, float slave_speed)
 739 {
 740         if (slave_speed && _transport_speed) {
 741
 742                 /* something isn't right, but we should move with the master
 743                    for now.
 744                 */
 745
 746                 bool need_butler;
 747
 748                 silent_process_routes (nframes, need_butler);
 749
 750                 get_track_statistics ();
 751
 752                 if (need_butler) {
 753                         _butler->summon ();
 754                 }
 755
 756                 int32_t frames_moved = (int32_t) floor (_transport_speed * nframes);
 757
 758                 if (frames_moved < 0) {
 759                         decrement_transport_position (-frames_moved);
 760                 } else {
 761                         increment_transport_position (frames_moved);
 762                 }
 763
 764                 framepos_t stop_limit;
 765
 766                 if (actively_recording()) {
 767                         stop_limit = max_framepos;
 768                 } else {
 769                         if (Config->get_stop_at_session_end()) {
 770                                 stop_limit = current_end_frame();
 771                         } else {
 772                                 stop_limit = max_framepos;
 773                         }
 774                 }
 775
 776                 maybe_stop (stop_limit);
 777         }
 778 }
 779
 780 void
 781 Session::process_without_events (pframes_t nframes)
 782 {
 783         bool session_needs_butler = false;
 784         framepos_t stop_limit;
 785         framecnt_t frames_moved;
 786
 787         if (!process_can_proceed()) {
 788                 _silent = true;
 789                 return;
 790         }
 791
 792         if (!_exporting && _slave) {
 793                 if (!follow_slave (nframes)) {
 794                         return;
 795                 }
 796         }
 797
 798         if (_transport_speed == 0) {
 799                 fail_roll (nframes);
 800                 return;
 801         }
 802
 803         if (_transport_speed == 1.0) {
 804                 frames_moved = (framecnt_t) nframes;
 805         } else {
 806                 interpolation.set_target_speed (fabs(_target_transport_speed));
 807                 interpolation.set_speed (fabs(_transport_speed));
 808                 frames_moved = (framecnt_t) interpolation.interpolate (0, nframes, 0, 0);
 809         }
 810
 811         if (!_exporting && !timecode_transmission_suspended()) {
 812                 send_midi_time_code_for_cycle (_transport_frame, _transport_frame + frames_moved, nframes);
 813         }
 814
 815         if (actively_recording()) {
 816                 stop_limit = max_framepos;
 817         } else {
 818                 if (Config->get_stop_at_session_end()) {
 819                         stop_limit = current_end_frame();
 820                 } else {
 821                         stop_limit = max_framepos;
 822                 }
 823         }
 824
 825         if (maybe_stop (stop_limit)) {
 826                 fail_roll (nframes);
 827                 return;
 828         }
 829
 830         if (maybe_sync_start (nframes)) {
 831                 return;
 832         }
 833
 834         click (_transport_frame, nframes);
 835
 836         if (process_routes (nframes, session_needs_butler)) {
 837                 fail_roll (nframes);
 838                 return;
 839         }
 840
 841         get_track_statistics ();
 842
 843         /* XXX: I'm not sure whether this is correct, but at least it
 844            matches process_with_events, so that this new frames_moved
 845            is -ve when transport speed is -ve.  This means that the
 846            transport position is updated correctly when we are in
 847            reverse.  It seems a bit wrong that we're not using the
 848            interpolator to compute this.
 849         */
 850
 851         frames_moved = (framecnt_t) floor (_transport_speed * nframes);
 852
 853         if (frames_moved < 0) {
 854                 decrement_transport_position (-frames_moved);
 855         } else {
 856                 increment_transport_position (frames_moved);
 857         }
 858
 859         maybe_stop (stop_limit);
 860         check_declick_out ();
 861
 862         if (session_needs_butler) {
 863                 _butler->summon ();
 864         }
 865 }
 866
 867 /** Process callback used when the auditioner is active.
 868  * @param nframes number of frames to process.
 869  */
 870 void
 871 Session::process_audition (pframes_t nframes)
 872 {
 873         SessionEvent* ev;
 874         boost::shared_ptr<RouteList> r = routes.reader ();
 875
 876         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 877                 if (!(*i)->is_hidden()) {
 878                         (*i)->silence (nframes);
 879                 }
 880         }
 881
 882         /* run the auditioner, and if it says we need butler service, ask for it */
 883
 884         if (auditioner->play_audition (nframes) > 0) {
 885                 _butler->summon ();
 886         }
 887
 888         /* if using a monitor section, run it because otherwise we don't hear anything */
 889
 890         if (auditioner->needs_monitor()) {
 891                 _monitor_out->passthru (_transport_frame, _transport_frame + nframes, nframes, false);
 892         }
 893
 894         /* handle pending events */
 895
 896         while (pending_events.read (&ev, 1) == 1) {
 897                 merge_event (ev);
 898         }
 899
 900         /* if we are not in the middle of a state change,
 901            and there are immediate events queued up,
 902            process them.
 903         */
 904
 905         while (!non_realtime_work_pending() && !immediate_events.empty()) {
 906                 SessionEvent *ev = immediate_events.front ();
 907                 immediate_events.pop_front ();
 908                 process_event (ev);
 909         }
 910
 911         if (!auditioner->auditioning()) {
 912                 /* auditioner no longer active, so go back to the normal process callback */
 913                 process_function = &Session::process_with_events;
 914         }
 915 }
 916
 917 bool
 918 Session::maybe_sync_start (pframes_t & nframes)
 919 {
 920         pframes_t sync_offset;
 921
 922         if (!waiting_for_sync_offset) {
 923                 return false;
 924         }
 925
 926         if (_engine.get_sync_offset (sync_offset) && sync_offset < nframes) {
 927
 928                 /* generate silence up to the sync point, then
 929                    adjust nframes + offset to reflect whatever
 930                    is left to do.
 931                 */
 932
 933                 no_roll (sync_offset);
 934                 nframes -= sync_offset;
 935                 AudioPort::increment_port_offset (sync_offset);
 936                 waiting_for_sync_offset = false;
 937
 938                 if (nframes == 0) {
 939                         return true; // done, nothing left to process
 940                 }
 941
 942         } else {
 943
 944                 /* sync offset point is not within this process()
 945                    cycle, so just generate silence. and don't bother
 946                    with any fancy stuff here, just the minimal silence.
 947                 */
 948
 949                 _silent = true;
 950
 951                 if (Config->get_locate_while_waiting_for_sync()) {
 952                         if (micro_locate (nframes)) {
 953                                 /* XXX ERROR !!! XXX */
 954                         }
 955                 }
 956
 957                 return true; // done, nothing left to process
 958         }
 959
 960         return false;
 961 }
 962
 963 void
 964 Session::queue_event (SessionEvent* ev)
 965 {
 966         if (_state_of_the_state & Deletion) {
 967                 return;
 968         } else if (_state_of_the_state & Loading) {
 969                 merge_event (ev);
 970         } else {
 971                 pending_events.write (&ev, 1);
 972         }
 973 }
 974
 975 void
 976 Session::set_next_event ()
 977 {
 978         if (events.empty()) {
 979                 next_event = events.end();
 980                 return;
 981         }
 982
 983         if (next_event == events.end()) {
 984                 next_event = events.begin();
 985         }
 986
 987         if ((*next_event)->action_frame > _transport_frame) {
 988                 next_event = events.begin();
 989         }
 990
 991         for (; next_event != events.end(); ++next_event) {
 992                 if ((*next_event)->action_frame >= _transport_frame) {
 993                         break;
 994                 }
 995         }
 996 }
 997
 998 void
 999 Session::process_event (SessionEvent* ev)
1000 {
1001         bool remove = true;
1002         bool del = true;
1003
1004         /* if we're in the middle of a state change (i.e. waiting
1005            for the butler thread to complete the non-realtime
1006            part of the change), we'll just have to queue this
1007            event for a time when the change is complete.
1008         */
1009
1010         if (non_realtime_work_pending()) {
1011
1012                 /* except locates, which we have the capability to handle */
1013
1014                 if (ev->type != SessionEvent::Locate) {
1015                         immediate_events.insert (immediate_events.end(), ev);
1016                         _remove_event (ev);
1017                         return;
1018                 }
1019         }
1020
1021         DEBUG_TRACE (DEBUG::SessionEvents, string_compose ("Processing event: %1 @ %2\n", enum_2_string (ev->type), _transport_frame));
1022
1023         switch (ev->type) {
1024         case SessionEvent::SetLoop:
1025                 set_play_loop (ev->yes_or_no);
1026                 break;
1027
1028         case SessionEvent::AutoLoop:
1029                 if (play_loop) {
1030                         start_locate (ev->target_frame, true, false, Config->get_seamless_loop());
1031                 }
1032                 remove = false;
1033                 del = false;
1034                 break;
1035
1036         case SessionEvent::Locate:
1037                 if (ev->yes_or_no) {
1038                         // cerr << "forced locate to " << ev->target_frame << endl;
1039                         locate (ev->target_frame, false, true, false);
1040                 } else {
1041                         // cerr << "soft locate to " << ev->target_frame << endl;
1042                         start_locate (ev->target_frame, false, true, false);
1043                 }
1044                 _send_timecode_update = true;
1045                 break;
1046
1047         case SessionEvent::LocateRoll:
1048                 if (ev->yes_or_no) {
1049                         // cerr << "forced locate to+roll " << ev->target_frame << endl;
1050                         locate (ev->target_frame, true, true, false);
1051                 } else {
1052                         // cerr << "soft locate to+roll " << ev->target_frame << endl;
1053                         start_locate (ev->target_frame, true, true, false);
1054                 }
1055                 _send_timecode_update = true;
1056                 break;
1057
1058         case SessionEvent::LocateRollLocate:
1059                 // locate is handled by ::request_roll_at_and_return()
1060                 _requested_return_frame = ev->target_frame;
1061                 request_locate (ev->target2_frame, true);
1062                 break;
1063
1064
1065         case SessionEvent::SetTransportSpeed:
1066                 set_transport_speed (ev->speed, ev->yes_or_no, ev->second_yes_or_no);
1067                 break;
1068
1069         case SessionEvent::PunchIn:
1070                 // cerr << "PunchIN at " << transport_frame() << endl;
1071                 if (config.get_punch_in() && record_status() == Enabled) {
1072                         enable_record ();
1073                 }
1074                 remove = false;
1075                 del = false;
1076                 break;
1077
1078         case SessionEvent::PunchOut:
1079                 // cerr << "PunchOUT at " << transport_frame() << endl;
1080                 if (config.get_punch_out()) {
1081                         step_back_from_record ();
1082                 }
1083                 remove = false;
1084                 del = false;
1085                 break;
1086
1087         case SessionEvent::StopOnce:
1088                 if (!non_realtime_work_pending()) {
1089                         stop_transport (ev->yes_or_no);
1090                         _clear_event_type (SessionEvent::StopOnce);
1091                 }
1092                 remove = false;
1093                 del = false;
1094                 break;
1095
1096         case SessionEvent::RangeStop:
1097                 if (!non_realtime_work_pending()) {
1098                         stop_transport (ev->yes_or_no);
1099                 }
1100                 remove = false;
1101                 del = false;
1102                 break;
1103
1104         case SessionEvent::RangeLocate:
1105                 start_locate (ev->target_frame, true, true, false);
1106                 remove = false;
1107                 del = false;
1108                 break;
1109
1110         case SessionEvent::Overwrite:
1111                 overwrite_some_buffers (static_cast<Track*>(ev->ptr));
1112                 break;
1113
1114         case SessionEvent::SetTrackSpeed:
1115                 set_track_speed (static_cast<Track*> (ev->ptr), ev->speed);
1116                 break;
1117
1118         case SessionEvent::SetSyncSource:
1119                 use_sync_source (ev->slave);
1120                 break;
1121
1122         case SessionEvent::Audition:
1123                 set_audition (ev->region);
1124                 // drop reference to region
1125                 ev->region.reset ();
1126                 break;
1127
1128         case SessionEvent::InputConfigurationChange:
1129                 add_post_transport_work (PostTransportInputChange);
1130                 _butler->schedule_transport_work ();
1131                 break;
1132
1133         case SessionEvent::SetPlayAudioRange:
1134                 set_play_range (ev->audio_range, (ev->speed == 1.0f));
1135                 break;
1136
1137         case SessionEvent::RealTimeOperation:
1138                 process_rtop (ev);
1139                 del = false; // other side of RT request needs to clean up
1140                 break;
1141
1142         case SessionEvent::AdjustPlaybackBuffering:
1143                 schedule_playback_buffering_adjustment ();
1144                 break;
1145
1146         case SessionEvent::AdjustCaptureBuffering:
1147                 schedule_capture_buffering_adjustment ();
1148                 break;
1149
1150         case SessionEvent::SetTimecodeTransmission:
1151                 g_atomic_int_set (&_suspend_timecode_transmission, ev->yes_or_no ? 0 : 1);
1152                 break;
1153
1154         default:
1155           fatal << string_compose(_("Programming error: illegal event type in process_event (%1)"), ev->type) << endmsg;
1156                 /*NOTREACHED*/
1157                 break;
1158         };
1159
1160         if (remove) {
1161                 del = del && !_remove_event (ev);
1162         }
1163
1164         if (del) {
1165                 delete ev;
1166         }
1167 }
1168