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/audio_diskstream.h"
  32 #include "ardour/audioengine.h"
  33 #include "ardour/auditioner.h"
  34 #include "ardour/butler.h"
  35 #include "ardour/debug.h"
  36 #include "ardour/session.h"
  37 #include "ardour/slave.h"
  38 #include "ardour/timestamps.h"
  39
  40 #include "midi++/manager.h"
  41
  42 #include "i18n.h"
  43
  44 using namespace ARDOUR;
  45 using namespace PBD;
  46 using namespace std;
  47
  48 /** Called by the audio engine when there is work to be done with JACK.
  49  * @param nframes Number of frames to process.
  50  */
  51 void
  52 Session::process (nframes_t nframes)
  53 {
  54         MIDI::Manager::instance()->cycle_start(nframes);
  55
  56         _silent = false;
  57
  58         if (processing_blocked()) {
  59                 _silent = true;
  60                 return;
  61         }
  62
  63         if (non_realtime_work_pending()) {
  64                 if (!_butler->transport_work_requested ()) {
  65                         post_transport ();
  66                 }
  67         }
  68
  69         (this->*process_function) (nframes);
  70
  71         // the ticker is for sending time information like MidiClock
  72         nframes_t transport_frames = transport_frame();
  73         BBT_Time  transport_bbt;
  74         bbt_time(transport_frames, transport_bbt);
  75         Timecode::Time transport_timecode;
  76         timecode_time(transport_frames, transport_timecode);
  77         tick (transport_frames, transport_bbt, transport_timecode); /* EMIT SIGNAL */
  78
  79         SendFeedback (); /* EMIT SIGNAL */
  80
  81         MIDI::Manager::instance()->cycle_end();
  82 }
  83
  84 int
  85 Session::fail_roll (nframes_t nframes)
  86 {
  87         return no_roll (nframes);
  88 }
  89
  90 int
  91 Session::no_roll (nframes_t nframes)
  92 {
  93         nframes_t end_frame = _transport_frame + nframes; // FIXME: varispeed + no_roll ??
  94         int ret = 0;
  95         bool declick = get_transport_declick_required();
  96         boost::shared_ptr<RouteList> r = routes.reader ();
  97
  98         if (_click_io) {
  99                 _click_io->silence (nframes);
 100         }
 101
 102         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 103
 104                 if ((*i)->is_hidden()) {
 105                         continue;
 106                 }
 107
 108                 (*i)->set_pending_declick (declick);
 109
 110                 if ((*i)->no_roll (nframes, _transport_frame, end_frame, non_realtime_work_pending(),
 111                                    actively_recording(), declick)) {
 112                         error << string_compose(_("Session: error in no roll for %1"), (*i)->name()) << endmsg;
 113                         ret = -1;
 114                         break;
 115                 }
 116         }
 117
 118         return ret;
 119 }
 120
 121 int
 122 Session::process_routes (nframes_t nframes, bool& need_butler)
 123 {
 124         bool record_active;
 125         int  declick = get_transport_declick_required();
 126         bool rec_monitors = get_rec_monitors_input();
 127         boost::shared_ptr<RouteList> r = routes.reader ();
 128
 129         if (transport_sub_state & StopPendingCapture) {
 130                 /* force a declick out */
 131                 declick = -1;
 132         }
 133
 134         record_active = actively_recording(); // || (get_record_enabled() && get_punch_in());
 135
 136         const nframes_t start_frame = _transport_frame;
 137         const nframes_t end_frame = _transport_frame + (nframes_t)floor(nframes * _transport_speed);
 138
 139         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 140
 141                 int ret;
 142
 143                 if ((*i)->is_hidden()) {
 144                         continue;
 145                 }
 146
 147                 (*i)->set_pending_declick (declick);
 148
 149                 if ((ret = (*i)->roll (nframes, start_frame, end_frame, declick, record_active, rec_monitors, need_butler)) < 0) {
 150                         stop_transport ();
 151                         return -1;
 152                 }
 153         }
 154
 155         return 0;
 156 }
 157
 158 int
 159 Session::silent_process_routes (nframes_t nframes, bool& need_butler)
 160 {
 161         bool record_active = actively_recording();
 162         int  declick = get_transport_declick_required();
 163         bool rec_monitors = get_rec_monitors_input();
 164         boost::shared_ptr<RouteList> r = routes.reader ();
 165
 166         if (transport_sub_state & StopPendingCapture) {
 167                 /* force a declick out */
 168                 declick = -1;
 169         }
 170
 171         const nframes_t start_frame = _transport_frame;
 172         const nframes_t end_frame = _transport_frame + lrintf(nframes * _transport_speed);
 173
 174         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 175
 176                 int ret;
 177
 178                 if ((*i)->is_hidden()) {
 179                         continue;
 180                 }
 181
 182                 if ((ret = (*i)->silent_roll (nframes, start_frame, end_frame, record_active, rec_monitors, need_butler)) < 0) {
 183                         stop_transport ();
 184                         return -1;
 185                 }
 186         }
 187
 188         return 0;
 189 }
 190
 191 void
 192 Session::get_diskstream_statistics ()
 193 {
 194         float pworst = 1.0f;
 195         float cworst = 1.0f;
 196
 197         boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 198         for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
 199
 200                 if ((*i)->hidden()) {
 201                         continue;
 202                 }
 203
 204                 pworst = min (pworst, (*i)->playback_buffer_load());
 205                 cworst = min (cworst, (*i)->capture_buffer_load());
 206         }
 207
 208         uint32_t pmin = g_atomic_int_get (&_playback_load);
 209         uint32_t pminold = g_atomic_int_get (&_playback_load_min);
 210         uint32_t cmin = g_atomic_int_get (&_capture_load);
 211         uint32_t cminold = g_atomic_int_get (&_capture_load_min);
 212
 213         g_atomic_int_set (&_playback_load, (uint32_t) floor (pworst * 100.0f));
 214         g_atomic_int_set (&_capture_load, (uint32_t) floor (cworst * 100.0f));
 215         g_atomic_int_set (&_playback_load_min, min (pmin, pminold));
 216         g_atomic_int_set (&_capture_load_min, min (cmin, cminold));
 217
 218         if (actively_recording()) {
 219                 set_dirty();
 220         }
 221 }
 222
 223 /** Process callback used when the auditioner is not active */
 224 void
 225 Session::process_with_events (nframes_t nframes)
 226 {
 227         SessionEvent*         ev;
 228         nframes_t      this_nframes;
 229         nframes_t      end_frame;
 230         bool           session_needs_butler = false;
 231         nframes_t      stop_limit;
 232         long           frames_moved;
 233
 234         /* make sure the auditioner is silent */
 235
 236         if (auditioner) {
 237                 auditioner->silence (nframes);
 238         }
 239
 240         /* handle any pending events */
 241
 242         while (pending_events.read (&ev, 1) == 1) {
 243                 merge_event (ev);
 244         }
 245
 246         /* if we are not in the middle of a state change,
 247            and there are immediate events queued up,
 248            process them.
 249         */
 250
 251         while (!non_realtime_work_pending() && !immediate_events.empty()) {
 252                 SessionEvent *ev = immediate_events.front ();
 253                 immediate_events.pop_front ();
 254                 process_event (ev);
 255         }
 256
 257         /* Events caused a transport change, send an MTC Full Frame (Timecode) message.
 258          * This is sent whether rolling or not, to give slaves an idea of ardour time
 259          * on locates (and allow slow slaves to position and prepare for rolling)
 260          */
 261         if (_send_timecode_update) {
 262                 send_full_time_code(nframes);
 263                 deliver_mmc (MIDI::MachineControl::cmdLocate, _transport_frame);
 264         }
 265
 266         if (!process_can_proceed()) {
 267                 _silent = true;
 268                 return;
 269         }
 270
 271         if (events.empty() || next_event == events.end()) {
 272                 process_without_events (nframes);
 273                 return;
 274         }
 275
 276         if (_transport_speed == 1.0) {
 277                 frames_moved = (long) nframes;
 278         } else {
 279                 interpolation.set_target_speed (fabs(_target_transport_speed));
 280                 interpolation.set_speed (fabs(_transport_speed));
 281                 frames_moved = (long) interpolation.interpolate (0, nframes, 0, 0);
 282         }
 283
 284         end_frame = _transport_frame + (nframes_t)frames_moved;
 285
 286         {
 287                 SessionEvent* this_event;
 288                 Events::iterator the_next_one;
 289
 290                 if (!process_can_proceed()) {
 291                         _silent = true;
 292                         return;
 293                 }
 294
 295                 if (!_exporting && _slave) {
 296                         if (!follow_slave (nframes)) {
 297                                 return;
 298                         }
 299                 }
 300
 301                 if (_transport_speed == 0) {
 302                         no_roll (nframes);
 303                         return;
 304                 }
 305
 306                 if (!_exporting) {
 307                         send_midi_time_code_for_cycle (nframes);
 308                 }
 309
 310                 if (actively_recording()) {
 311                         stop_limit = max_frames;
 312                 } else {
 313
 314                         if (Config->get_stop_at_session_end()) {
 315                                 stop_limit = current_end_frame();
 316                         } else {
 317                                 stop_limit = max_frames;
 318                         }
 319                 }
 320
 321                 if (maybe_stop (stop_limit)) {
 322                         no_roll (nframes);
 323                         return;
 324                 }
 325
 326                 this_event = *next_event;
 327                 the_next_one = next_event;
 328                 ++the_next_one;
 329
 330                 /* yes folks, here it is, the actual loop where we really truly
 331                    process some audio
 332                 */
 333
 334                 while (nframes) {
 335
 336                         this_nframes = nframes; /* real (jack) time relative */
 337                         frames_moved = (long) floor (_transport_speed * nframes); /* transport relative */
 338
 339                         /* running an event, position transport precisely to its time */
 340                         if (this_event && this_event->action_frame <= end_frame && this_event->action_frame >= _transport_frame) {
 341                                 /* this isn't quite right for reverse play */
 342                                 frames_moved = (long) (this_event->action_frame - _transport_frame);
 343                                 this_nframes = (nframes_t) abs( floor(frames_moved / _transport_speed) );
 344                         }
 345
 346                         if (this_nframes) {
 347
 348                                 click (_transport_frame, this_nframes);
 349
 350                                 if (process_routes (this_nframes, session_needs_butler)) {
 351                                         fail_roll (nframes);
 352                                         return;
 353                                 }
 354
 355                                 nframes -= this_nframes;
 356
 357                                 if (frames_moved < 0) {
 358                                         decrement_transport_position (-frames_moved);
 359                                 } else {
 360                                         increment_transport_position (frames_moved);
 361                                 }
 362
 363                                 maybe_stop (stop_limit);
 364                                 check_declick_out ();
 365                         }
 366
 367                         _engine.split_cycle (this_nframes);
 368
 369                         /* now handle this event and all others scheduled for the same time */
 370
 371                         while (this_event && this_event->action_frame == _transport_frame) {
 372                                 process_event (this_event);
 373
 374                                 if (the_next_one == events.end()) {
 375                                         this_event = 0;
 376                                 } else {
 377                                         this_event = *the_next_one;
 378                                         ++the_next_one;
 379                                 }
 380                         }
 381
 382                         /* if an event left our state changing, do the right thing */
 383
 384                         if (nframes && non_realtime_work_pending()) {
 385                                 no_roll (nframes);
 386                                 break;
 387                         }
 388
 389                         /* this is necessary to handle the case of seamless looping */
 390                         end_frame = _transport_frame + (nframes_t) floor (nframes * _transport_speed);
 391
 392                 }
 393
 394                 set_next_event ();
 395
 396         } /* implicit release of route lock */
 397
 398         if (session_needs_butler) {
 399                 _butler->summon ();
 400         }
 401 }
 402
 403 void
 404 Session::reset_slave_state ()
 405 {
 406         average_slave_delta = 1800;
 407         delta_accumulator_cnt = 0;
 408         have_first_delta_accumulator = false;
 409         _slave_state = Stopped;
 410 }
 411
 412 bool
 413 Session::transport_locked () const
 414 {
 415         Slave* sl = _slave;
 416
 417         if (!locate_pending() && (!config.get_external_sync() || (sl && sl->ok() && sl->locked()))) {
 418                 return true;
 419         }
 420
 421         return false;
 422 }
 423
 424 bool
 425 Session::follow_slave (nframes_t nframes)
 426 {
 427         double slave_speed;
 428         nframes64_t slave_transport_frame;
 429         nframes_t this_delta;
 430         int dir;
 431
 432         if (!_slave->ok()) {
 433                 stop_transport ();
 434                 config.set_external_sync (false);
 435                 goto noroll;
 436         }
 437
 438         _slave->speed_and_position (slave_speed, slave_transport_frame);
 439
 440         DEBUG_TRACE (DEBUG::Slave, string_compose ("Slave position %1 speed %2\n", slave_transport_frame, slave_speed));
 441
 442         if (!_slave->locked()) {
 443                 DEBUG_TRACE (DEBUG::Slave, "slave not locked\n");
 444                 goto noroll;
 445         }
 446
 447         if (slave_transport_frame > _transport_frame) {
 448                 this_delta = slave_transport_frame - _transport_frame;
 449                 dir = 1;
 450         } else {
 451                 this_delta = _transport_frame - slave_transport_frame;
 452                 dir = -1;
 453         }
 454
 455         if (_slave->starting()) {
 456                 slave_speed = 0.0f;
 457         }
 458
 459         if (_slave->is_always_synced() || config.get_timecode_source_is_synced()) {
 460
 461                 /* if the TC source is synced, then we assume that its
 462                    speed is binary: 0.0 or 1.0
 463                 */
 464
 465                 if (slave_speed != 0.0f) {
 466                         slave_speed = 1.0f;
 467                 }
 468
 469         } else {
 470
 471                 /* if we are chasing and the average delta between us and the
 472                    master gets too big, we want to switch to silent
 473                    motion. so keep track of that here.
 474                 */
 475
 476                 if (_slave_state == Running) {
 477                         calculate_moving_average_of_slave_delta(dir, this_delta);
 478                 }
 479         }
 480
 481         track_slave_state (slave_speed, slave_transport_frame, this_delta);
 482
 483         DEBUG_TRACE (DEBUG::Slave, string_compose ("slave state %1 @ %2 speed %3 cur delta %4 avg delta %5\n",
 484                                                    _slave_state, slave_transport_frame, slave_speed, this_delta, average_slave_delta));
 485
 486
 487         if (_slave_state == Running && !_slave->is_always_synced() && !config.get_timecode_source_is_synced()) {
 488
 489                 if (_transport_speed != 0.0f) {
 490
 491                         /*
 492                            note that average_dir is +1 or -1
 493                         */
 494
 495                         float delta;
 496
 497                         if (average_slave_delta == 0) {
 498                                 delta = this_delta;
 499                                 delta *= dir;
 500                         } else {
 501                                 delta = average_slave_delta;
 502                                 delta *= average_dir;
 503                         }
 504
 505 #ifndef NDEBUG
 506                         if (slave_speed != 0.0) {
 507                                 DEBUG_TRACE (DEBUG::Slave, string_compose ("delta = %1 speed = %2 ts = %3 M@%4 S@%5 avgdelta %6\n",
 508                                                                            (int) (dir * this_delta),
 509                                                                            slave_speed,
 510                                                                            _transport_speed,
 511                                                                            _transport_frame,
 512                                                                            slave_transport_frame,
 513                                                                            average_slave_delta));
 514                         }
 515 #endif
 516
 517                         if (_slave->give_slave_full_control_over_transport_speed()) {
 518                                 set_transport_speed (slave_speed, false, false);
 519                                 //std::cout << "set speed = " << slave_speed << "\n";
 520                         } else {
 521                                 float adjusted_speed = slave_speed + (1.5 * (delta /  float(_current_frame_rate)));
 522                                 request_transport_speed (adjusted_speed);
 523                                 DEBUG_TRACE (DEBUG::Slave, string_compose ("adjust using %1 towards %2 ratio %3 current %4 slave @ %5\n",
 524                                                                            delta, adjusted_speed, adjusted_speed/slave_speed, _transport_speed,
 525                                                                            slave_speed));
 526                         }
 527
 528 #if 1
 529                         if ((nframes_t) abs(average_slave_delta) > _slave->resolution()) {
 530                                 cerr << "average slave delta greater than slave resolution (" << _slave->resolution() << "), going to silent motion\n";
 531                                 goto silent_motion;
 532                         }
 533 #endif
 534                 }
 535         }
 536
 537
 538         if (_slave_state == Running && !non_realtime_work_pending()) {
 539                 /* speed is set, we're locked, and good to go */
 540                 return true;
 541         }
 542
 543   silent_motion:
 544         DEBUG_TRACE (DEBUG::Slave, "silent motion\n")
 545         follow_slave_silently (nframes, slave_speed);
 546
 547   noroll:
 548         /* don't move at all */
 549         DEBUG_TRACE (DEBUG::Slave, "no roll\n")
 550         no_roll (nframes);
 551         return false;
 552 }
 553
 554 void
 555 Session::calculate_moving_average_of_slave_delta(int dir, nframes_t this_delta)
 556 {
 557         if (delta_accumulator_cnt >= delta_accumulator_size) {
 558                 have_first_delta_accumulator = true;
 559                 delta_accumulator_cnt = 0;
 560         }
 561
 562         if (delta_accumulator_cnt != 0 || this_delta < _current_frame_rate) {
 563                 delta_accumulator[delta_accumulator_cnt++] = long(dir) * long(this_delta);
 564         }
 565
 566         if (have_first_delta_accumulator) {
 567                 average_slave_delta = 0L;
 568                 for (int i = 0; i < delta_accumulator_size; ++i) {
 569                         average_slave_delta += delta_accumulator[i];
 570                 }
 571                 average_slave_delta /= long(delta_accumulator_size);
 572                 if (average_slave_delta < 0L) {
 573                         average_dir = -1;
 574                         average_slave_delta = abs(average_slave_delta);
 575                 } else {
 576                         average_dir = 1;
 577                 }
 578         }
 579 }
 580
 581 void
 582 Session::track_slave_state (float slave_speed, nframes_t slave_transport_frame, nframes_t this_delta)
 583 {
 584         if (slave_speed != 0.0f) {
 585
 586                 /* slave is running */
 587
 588                 switch (_slave_state) {
 589                 case Stopped:
 590                         if (_slave->requires_seekahead()) {
 591                                 slave_wait_end = slave_transport_frame + _slave->seekahead_distance ();
 592                                 DEBUG_TRACE (DEBUG::Slave, string_compose ("slave stopped, but running, requires seekahead to %1\n", slave_wait_end));
 593                                 /* we can call locate() here because we are in process context */
 594                                 locate (slave_wait_end, false, false);
 595                                 _slave_state = Waiting;
 596
 597                         } else {
 598
 599                                 _slave_state = Running;
 600
 601                                 Location* al = _locations.auto_loop_location();
 602
 603                                 if (al && play_loop && (slave_transport_frame < al->start() || slave_transport_frame > al->end())) {
 604                                         // cancel looping
 605                                         request_play_loop(false);
 606                                 }
 607
 608                                 if (slave_transport_frame != _transport_frame) {
 609                                         locate (slave_transport_frame, false, false);
 610                                 }
 611                         }
 612                         break;
 613
 614                 case Waiting:
 615                 default:
 616                         break;
 617                 }
 618
 619                 if (_slave_state == Waiting) {
 620
 621                         DEBUG_TRACE (DEBUG::Slave, string_compose ("slave waiting at %1\n", slave_transport_frame));
 622
 623                         if (slave_transport_frame >= slave_wait_end) {
 624
 625                                 DEBUG_TRACE (DEBUG::Slave, string_compose ("slave start at %1 vs %2\n", slave_transport_frame, _transport_frame));
 626
 627                                 _slave_state = Running;
 628
 629                                 /* now perform a "micro-seek" within the disk buffers to realign ourselves
 630                                    precisely with the master.
 631                                 */
 632
 633
 634                                 bool ok = true;
 635                                 nframes_t frame_delta = slave_transport_frame - _transport_frame;
 636
 637                                 boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 638
 639                                 for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
 640                                         if (!(*i)->can_internal_playback_seek (frame_delta)) {
 641                                                 ok = false;
 642                                                 break;
 643                                         }
 644                                 }
 645
 646                                 if (ok) {
 647                                         for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
 648                                                 (*i)->internal_playback_seek (frame_delta);
 649                                         }
 650                                         _transport_frame += frame_delta;
 651
 652                                 } else {
 653                                         cerr << "cannot micro-seek\n";
 654                                         /* XXX what? */
 655                                 }
 656
 657                                 memset (delta_accumulator, 0, sizeof (long) * delta_accumulator_size);
 658                                 average_slave_delta = 0L;
 659                                 this_delta = 0;
 660                         }
 661                 }
 662
 663                 if (_slave_state == Running && _transport_speed == 0.0f) {
 664                         DEBUG_TRACE (DEBUG::Slave, "slave starts transport\n");
 665                         start_transport ();
 666                 }
 667
 668         } else { // slave_speed is 0
 669
 670                 /* slave has stopped */
 671
 672                 if (_transport_speed != 0.0f) {
 673                         DEBUG_TRACE (DEBUG::Slave, string_compose ("slave stops transport: %1 frame %2 tf %3\n", slave_speed, slave_transport_frame, _transport_frame));
 674                         stop_transport();
 675                 }
 676
 677                 if (slave_transport_frame != _transport_frame) {
 678                         DEBUG_TRACE (DEBUG::Slave, string_compose ("slave stopped, move to %1\n", slave_transport_frame));
 679                         force_locate (slave_transport_frame, false);
 680                 }
 681
 682                 _slave_state = Stopped;
 683         }
 684 }
 685
 686 void
 687 Session::follow_slave_silently (nframes_t nframes, float slave_speed)
 688 {
 689         if (slave_speed && _transport_speed) {
 690
 691                 /* something isn't right, but we should move with the master
 692                    for now.
 693                 */
 694
 695                 bool need_butler;
 696
 697                 silent_process_routes (nframes, need_butler);
 698
 699                 if (need_butler) {
 700                         _butler->summon ();
 701                 }
 702
 703                 int32_t frames_moved = (int32_t) floor (_transport_speed * nframes);
 704
 705                 if (frames_moved < 0) {
 706                         decrement_transport_position (-frames_moved);
 707                 } else {
 708                         increment_transport_position (frames_moved);
 709                 }
 710
 711                 nframes_t stop_limit;
 712
 713                 if (actively_recording()) {
 714                         stop_limit = max_frames;
 715                 } else {
 716                         if (Config->get_stop_at_session_end()) {
 717                                 stop_limit = current_end_frame();
 718                         } else {
 719                                 stop_limit = max_frames;
 720                         }
 721                 }
 722
 723                 maybe_stop (stop_limit);
 724         }
 725 }
 726
 727 void
 728 Session::process_without_events (nframes_t nframes)
 729 {
 730         bool session_needs_butler = false;
 731         nframes_t stop_limit;
 732         long frames_moved;
 733
 734         if (!process_can_proceed()) {
 735                 _silent = true;
 736                 return;
 737         }
 738
 739         if (!_exporting && _slave) {
 740                 if (!follow_slave (nframes)) {
 741                         return;
 742                 }
 743         }
 744
 745         if (_transport_speed == 0) {
 746                 fail_roll (nframes);
 747                 return;
 748         }
 749
 750         if (!_exporting) {
 751                 send_midi_time_code_for_cycle (nframes);
 752         }
 753
 754         if (actively_recording()) {
 755                 stop_limit = max_frames;
 756         } else {
 757                 if (Config->get_stop_at_session_end()) {
 758                         stop_limit = current_end_frame();
 759                 } else {
 760                         stop_limit = max_frames;
 761                 }
 762         }
 763
 764         if (maybe_stop (stop_limit)) {
 765                 fail_roll (nframes);
 766                 return;
 767         }
 768
 769         if (maybe_sync_start (nframes)) {
 770                 return;
 771         }
 772
 773         click (_transport_frame, nframes);
 774
 775         if (_transport_speed == 1.0) {
 776                 frames_moved = (long) nframes;
 777         } else {
 778                 interpolation.set_target_speed (fabs(_target_transport_speed));
 779                 interpolation.set_speed (fabs(_transport_speed));
 780                 frames_moved = (long) interpolation.interpolate (0, nframes, 0, 0);
 781         }
 782
 783         if (process_routes (nframes, session_needs_butler)) {
 784                 fail_roll (nframes);
 785                 return;
 786         }
 787
 788         if (frames_moved < 0) {
 789                 decrement_transport_position (-frames_moved);
 790         } else {
 791                 increment_transport_position (frames_moved);
 792         }
 793
 794         maybe_stop (stop_limit);
 795         check_declick_out ();
 796
 797         if (session_needs_butler) {
 798                 _butler->summon ();
 799         }
 800 }
 801
 802 /** Process callback used when the auditioner is active.
 803  * @param nframes number of frames to process.
 804  */
 805 void
 806 Session::process_audition (nframes_t nframes)
 807 {
 808         SessionEvent* ev;
 809         boost::shared_ptr<RouteList> r = routes.reader ();
 810
 811         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 812                 if (!(*i)->is_hidden()) {
 813                         (*i)->silence (nframes);
 814                 }
 815         }
 816
 817         /* run the auditioner, and if it says we need butler service, ask for it */
 818
 819         if (auditioner->play_audition (nframes) > 0) {
 820                 _butler->summon ();
 821         }
 822
 823         /* if using a monitor section, run it because otherwise we don't hear anything */
 824
 825         if (auditioner->needs_monitor()) {
 826                 _monitor_out->passthru (_transport_frame, _transport_frame + nframes, nframes, false);
 827         }
 828
 829         /* handle pending events */
 830
 831         while (pending_events.read (&ev, 1) == 1) {
 832                 merge_event (ev);
 833         }
 834
 835         /* if we are not in the middle of a state change,
 836            and there are immediate events queued up,
 837            process them.
 838         */
 839
 840         while (!non_realtime_work_pending() && !immediate_events.empty()) {
 841                 SessionEvent *ev = immediate_events.front ();
 842                 immediate_events.pop_front ();
 843                 process_event (ev);
 844         }
 845
 846         if (!auditioner->auditioning()) {
 847                 /* auditioner no longer active, so go back to the normal process callback */
 848                 process_function = &Session::process_with_events;
 849         }
 850 }
 851
 852 bool
 853 Session::maybe_sync_start (nframes_t& nframes)
 854 {
 855         nframes_t sync_offset;
 856
 857         if (!waiting_for_sync_offset) {
 858                 return false;
 859         }
 860
 861         if (_engine.get_sync_offset (sync_offset) && sync_offset < nframes) {
 862
 863                 /* generate silence up to the sync point, then
 864                    adjust nframes + offset to reflect whatever
 865                    is left to do.
 866                 */
 867
 868                 no_roll (sync_offset);
 869                 nframes -= sync_offset;
 870                 Port::increment_port_offset (sync_offset);
 871                 waiting_for_sync_offset = false;
 872
 873                 if (nframes == 0) {
 874                         return true; // done, nothing left to process
 875                 }
 876
 877         } else {
 878
 879                 /* sync offset point is not within this process()
 880                    cycle, so just generate silence. and don't bother
 881                    with any fancy stuff here, just the minimal silence.
 882                 */
 883
 884                 _silent = true;
 885
 886                 if (Config->get_locate_while_waiting_for_sync()) {
 887                         if (micro_locate (nframes)) {
 888                                 /* XXX ERROR !!! XXX */
 889                         }
 890                 }
 891
 892                 return true; // done, nothing left to process
 893         }
 894
 895         return false;
 896 }
 897
 898 void
 899 Session::queue_event (SessionEvent* ev)
 900 {
 901         if (_state_of_the_state & Deletion) {
 902                 return;
 903         } else if (_state_of_the_state & Loading) {
 904                 merge_event (ev);
 905         } else {
 906                 pending_events.write (&ev, 1);
 907         }
 908 }
 909
 910 void
 911 Session::set_next_event ()
 912 {
 913         if (events.empty()) {
 914                 next_event = events.end();
 915                 return;
 916         }
 917
 918         if (next_event == events.end()) {
 919                 next_event = events.begin();
 920         }
 921
 922         if ((*next_event)->action_frame > _transport_frame) {
 923                 next_event = events.begin();
 924         }
 925
 926         for (; next_event != events.end(); ++next_event) {
 927                 if ((*next_event)->action_frame >= _transport_frame) {
 928                         break;
 929                 }
 930         }
 931 }
 932
 933 void
 934 Session::process_event (SessionEvent* ev)
 935 {
 936         bool remove = true;
 937         bool del = true;
 938
 939         /* if we're in the middle of a state change (i.e. waiting
 940            for the butler thread to complete the non-realtime
 941            part of the change), we'll just have to queue this
 942            event for a time when the change is complete.
 943         */
 944
 945         if (non_realtime_work_pending()) {
 946
 947                 /* except locates, which we have the capability to handle */
 948
 949                 if (ev->type != SessionEvent::Locate) {
 950                         immediate_events.insert (immediate_events.end(), ev);
 951                         _remove_event (ev);
 952                         return;
 953                 }
 954         }
 955
 956         DEBUG_TRACE (DEBUG::SessionEvents, string_compose ("Processing event: %1 @ %2\n", enum_2_string (ev->type), _transport_frame));
 957
 958         switch (ev->type) {
 959         case SessionEvent::SetLoop:
 960                 set_play_loop (ev->yes_or_no);
 961                 break;
 962
 963         case SessionEvent::AutoLoop:
 964                 if (play_loop) {
 965                         start_locate (ev->target_frame, true, false, Config->get_seamless_loop());
 966                 }
 967                 remove = false;
 968                 del = false;
 969                 break;
 970
 971         case SessionEvent::Locate:
 972                 if (ev->yes_or_no) {
 973                         // cerr << "forced locate to " << ev->target_frame << endl;
 974                         locate (ev->target_frame, false, true, false);
 975                 } else {
 976                         // cerr << "soft locate to " << ev->target_frame << endl;
 977                         start_locate (ev->target_frame, false, true, false);
 978                 }
 979                 _send_timecode_update = true;
 980                 break;
 981
 982         case SessionEvent::LocateRoll:
 983                 if (ev->yes_or_no) {
 984                         // cerr << "forced locate to+roll " << ev->target_frame << endl;
 985                         locate (ev->target_frame, true, true, false);
 986                 } else {
 987                         // cerr << "soft locate to+roll " << ev->target_frame << endl;
 988                         start_locate (ev->target_frame, true, true, false);
 989                 }
 990                 _send_timecode_update = true;
 991                 break;
 992
 993         case SessionEvent::LocateRollLocate:
 994                 // locate is handled by ::request_roll_at_and_return()
 995                 _requested_return_frame = ev->target_frame;
 996                 request_locate (ev->target2_frame, true);
 997                 break;
 998
 999
1000         case SessionEvent::SetTransportSpeed:
1001                 set_transport_speed (ev->speed, ev->yes_or_no, ev->second_yes_or_no);
1002                 break;
1003
1004         case SessionEvent::PunchIn:
1005                 // cerr << "PunchIN at " << transport_frame() << endl;
1006                 if (config.get_punch_in() && record_status() == Enabled) {
1007                         enable_record ();
1008                 }
1009                 remove = false;
1010                 del = false;
1011                 break;
1012
1013         case SessionEvent::PunchOut:
1014                 // cerr << "PunchOUT at " << transport_frame() << endl;
1015                 if (config.get_punch_out()) {
1016                         step_back_from_record ();
1017                 }
1018                 remove = false;
1019                 del = false;
1020                 break;
1021
1022         case SessionEvent::StopOnce:
1023                 if (!non_realtime_work_pending()) {
1024                         stop_transport (ev->yes_or_no);
1025                         _clear_event_type (SessionEvent::StopOnce);
1026                 }
1027                 remove = false;
1028                 del = false;
1029                 break;
1030
1031         case SessionEvent::RangeStop:
1032                 if (!non_realtime_work_pending()) {
1033                         stop_transport (ev->yes_or_no);
1034                 }
1035                 remove = false;
1036                 del = false;
1037                 break;
1038
1039         case SessionEvent::RangeLocate:
1040                 start_locate (ev->target_frame, true, true, false);
1041                 remove = false;
1042                 del = false;
1043                 break;
1044
1045         case SessionEvent::Overwrite:
1046                 overwrite_some_buffers (static_cast<Diskstream*>(ev->ptr));
1047                 break;
1048
1049         case SessionEvent::SetDiskstreamSpeed:
1050                 set_diskstream_speed (static_cast<Diskstream*> (ev->ptr), ev->speed);
1051                 break;
1052
1053         case SessionEvent::SetSyncSource:
1054                 use_sync_source (ev->slave);
1055                 break;
1056
1057         case SessionEvent::Audition:
1058                 set_audition (ev->region);
1059                 // drop reference to region
1060                 ev->region.reset ();
1061                 break;
1062
1063         case SessionEvent::InputConfigurationChange:
1064                 add_post_transport_work (PostTransportInputChange);
1065                 _butler->schedule_transport_work ();
1066                 break;
1067
1068         case SessionEvent::SetPlayAudioRange:
1069                 set_play_range (ev->audio_range, (ev->speed == 1.0f));
1070                 break;
1071
1072         case SessionEvent::RealTimeOperation:
1073                 process_rtop (ev);
1074                 del = false; // other side of RT request needs to clean up
1075                 break;
1076
1077         default:
1078           fatal << string_compose(_("Programming error: illegal event type in process_event (%1)"), ev->type) << endmsg;
1079                 /*NOTREACHED*/
1080                 break;
1081         };
1082
1083         if (remove) {
1084                 del = del && !_remove_event (ev);
1085         }
1086
1087         if (del) {
1088                 delete ev;
1089         }
1090 }
1091