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/session.h>
  32 #include <ardour/timestamps.h>
  33 #include <ardour/audio_diskstream.h>
  34 #include <ardour/audioengine.h>
  35 #include <ardour/slave.h>
  36 #include <ardour/auditioner.h>
  37 #include <ardour/cycles.h>
  38 #include <ardour/cycle_timer.h>
  39
  40 #include "i18n.h"
  41
  42 using namespace ARDOUR;
  43 using namespace PBD;
  44 using namespace std;
  45
  46 void
  47 Session::process (nframes_t nframes)
  48 {
  49         _silent = false;
  50
  51         if (processing_blocked()) {
  52                 _silent = true;
  53                 return;
  54         }
  55
  56         if (non_realtime_work_pending()) {
  57                 if (!transport_work_requested ()) {
  58                         post_transport ();
  59                 }
  60         }
  61
  62         (this->*process_function) (nframes);
  63
  64         {
  65                 Glib::Mutex::Lock lm (midi_lock, Glib::TRY_LOCK);
  66                 SendFeedback (); /* EMIT SIGNAL */
  67         }
  68 }
  69
  70 void
  71 Session::prepare_diskstreams ()
  72 {
  73         boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
  74         for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
  75                 (*i)->prepare ();
  76         }
  77 }
  78
  79 int
  80 Session::fail_roll (nframes_t nframes)
  81 {
  82         Port::set_port_offset (0);
  83         return no_roll (nframes);
  84
  85 }
  86
  87 int
  88 Session::no_roll (nframes_t nframes)
  89 {
  90         nframes_t end_frame = _transport_frame + nframes;
  91         int ret = 0;
  92         bool declick = get_transport_declick_required();
  93         boost::shared_ptr<RouteList> r = routes.reader ();
  94
  95         if (_click_io) {
  96                 _click_io->silence (nframes);
  97         }
  98
  99         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 100
 101                 if ((*i)->hidden()) {
 102                         continue;
 103                 }
 104
 105                 (*i)->set_pending_declick (declick);
 106
 107                 if ((*i)->no_roll (nframes, _transport_frame, end_frame, non_realtime_work_pending(),
 108                                    actively_recording(), declick)) {
 109                         error << string_compose(_("Session: error in no roll for %1"), (*i)->name()) << endmsg;
 110                         ret = -1;
 111                         break;
 112                 }
 113         }
 114
 115         return ret;
 116 }
 117
 118 int
 119 Session::process_routes (nframes_t nframes)
 120 {
 121         bool record_active;
 122         int  declick = get_transport_declick_required();
 123         bool rec_monitors = get_rec_monitors_input();
 124         boost::shared_ptr<RouteList> r = routes.reader ();
 125
 126         if (transport_sub_state & StopPendingCapture) {
 127                 /* force a declick out */
 128                 declick = -1;
 129         }
 130
 131         record_active = actively_recording(); // || (get_record_enabled() && get_punch_in());
 132
 133         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 134
 135                 int ret;
 136
 137                 if ((*i)->hidden()) {
 138                         continue;
 139                 }
 140
 141                 (*i)->set_pending_declick (declick);
 142
 143                 if ((ret = (*i)->roll (nframes, _transport_frame, _transport_frame + nframes, declick, record_active, rec_monitors)) < 0) {
 144
 145                         /* we have to do this here. Route::roll() for an AudioTrack will have called AudioDiskstream::process(),
 146                            and the DS will expect AudioDiskstream::commit() to be called. but we're aborting from that
 147                            call path, so make sure we release any outstanding locks here before we return failure.
 148                         */
 149
 150                         boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 151                         for (DiskstreamList::iterator ids = dsl->begin(); ids != dsl->end(); ++ids) {
 152                                 (*ids)->recover ();
 153                         }
 154
 155                         stop_transport ();
 156                         return -1;
 157                 }
 158         }
 159
 160         return 0;
 161 }
 162
 163 int
 164 Session::silent_process_routes (nframes_t nframes)
 165 {
 166         bool record_active = actively_recording();
 167         int  declick = get_transport_declick_required();
 168         bool rec_monitors = get_rec_monitors_input();
 169         boost::shared_ptr<RouteList> r = routes.reader ();
 170
 171         if (transport_sub_state & StopPendingCapture) {
 172                 /* force a declick out */
 173                 declick = -1;
 174         }
 175
 176         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 177
 178                 int ret;
 179
 180                 if ((*i)->hidden()) {
 181                         continue;
 182                 }
 183
 184                 if ((ret = (*i)->silent_roll (nframes, _transport_frame, _transport_frame + nframes, record_active, rec_monitors)) < 0) {
 185
 186                         /* we have to do this here. Route::roll() for an AudioTrack will have called AudioDiskstream::process(),
 187                            and the DS will expect AudioDiskstream::commit() to be called. but we're aborting from that
 188                            call path, so make sure we release any outstanding locks here before we return failure.
 189                         */
 190
 191                         boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 192                         for (DiskstreamList::iterator ids = dsl->begin(); ids != dsl->end(); ++ids) {
 193                                 (*ids)->recover ();
 194                         }
 195
 196                         stop_transport ();
 197                         return -1;
 198                 }
 199         }
 200
 201         return 0;
 202 }
 203
 204 void
 205 Session::commit_diskstreams (nframes_t nframes, bool &needs_butler)
 206 {
 207         int dret;
 208         float pworst = 1.0f;
 209         float cworst = 1.0f;
 210
 211         boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 212         for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
 213
 214                 if ((*i)->hidden()) {
 215                         continue;
 216                 }
 217
 218                 /* force all diskstreams not handled by a Route to call do their stuff.
 219                    Note: the diskstreams that were handled by a route will just return zero
 220                    from this call, because they know they were processed. So in fact, this
 221                    also runs commit() for every diskstream.
 222                  */
 223
 224                 if ((dret = (*i)->process (_transport_frame, nframes, actively_recording(), get_rec_monitors_input())) == 0) {
 225                         if ((*i)->commit (nframes)) {
 226                                 needs_butler = true;
 227                         }
 228
 229                 } else if (dret < 0) {
 230                         (*i)->recover();
 231                 }
 232
 233                 pworst = min (pworst, (*i)->playback_buffer_load());
 234                 cworst = min (cworst, (*i)->capture_buffer_load());
 235         }
 236
 237         uint32_t pmin = g_atomic_int_get (&_playback_load);
 238         uint32_t pminold = g_atomic_int_get (&_playback_load_min);
 239         uint32_t cmin = g_atomic_int_get (&_capture_load);
 240         uint32_t cminold = g_atomic_int_get (&_capture_load_min);
 241
 242         g_atomic_int_set (&_playback_load, (uint32_t) floor (pworst * 100.0f));
 243         g_atomic_int_set (&_capture_load, (uint32_t) floor (cworst * 100.0f));
 244         g_atomic_int_set (&_playback_load_min, min (pmin, pminold));
 245         g_atomic_int_set (&_capture_load_min, min (cmin, cminold));
 246
 247         if (actively_recording()) {
 248                 set_dirty();
 249         }
 250 }
 251
 252 void
 253 Session::process_with_events (nframes_t nframes)
 254 {
 255         Event* ev;
 256         nframes_t this_nframes;
 257         nframes_t end_frame;
 258
 259         bool session_needs_butler = false;
 260         nframes_t stop_limit;
 261         long           frames_moved;
 262
 263         cerr << "++PWE\n";
 264
 265         /* make sure the auditioner is silent */
 266
 267         if (auditioner) {
 268                 auditioner->silence (nframes);
 269         }
 270
 271         /* handle any pending events */
 272
 273         while (pending_events.read (&ev, 1) == 1) {
 274                 cerr << "********** merge event action " << ev->action << " type " << enum_2_string (ev->type) << " to pending\n";
 275                 merge_event (ev);
 276         }
 277
 278         /* if we are not in the middle of a state change,
 279            and there are immediate events queued up,
 280            process them.
 281         */
 282
 283         while (!non_realtime_work_pending() && !immediate_events.empty()) {
 284                 Event *ev = immediate_events.front ();
 285                 immediate_events.pop_front ();
 286                 cerr << "******* process immediate effect event type " << ev->action << " type " << enum_2_string (ev->type) << endl;
 287                 process_event (ev);
 288         }
 289
 290         dump_events ();
 291
 292         /* Events caused a transport change, send an MTC Full Frame (SMPTE) message.
 293          * This is sent whether rolling or not, to give slaves an idea of ardour time
 294          * on locates (and allow slow slaves to position and prepare for rolling)
 295          */
 296         if (_send_smpte_update) {
 297                 send_full_time_code ();
 298         }
 299
 300         if (!process_can_proceed()) {
 301                 _silent = true;
 302                 cerr << "++PWE out 1\n";
 303                 return;
 304         }
 305
 306         if (events.empty() || next_event == events.end()) {
 307                 process_without_events (nframes);
 308                 cerr << "++PWE out 2\n";
 309                 return;
 310         }
 311
 312         end_frame = _transport_frame + (nframes_t)abs(floor(nframes * _transport_speed));
 313
 314         {
 315                 Event* this_event;
 316                 Events::iterator the_next_one;
 317
 318                 if (!process_can_proceed()) {
 319                         _silent = true;
 320                         return;
 321                 }
 322
 323                 if (!_exporting && _slave) {
 324                         if (!follow_slave (nframes)) {
 325                                 return;
 326                         }
 327                 }
 328
 329                 if (_transport_speed == 0) {
 330                         no_roll (nframes);
 331                         cerr << "++PWE out 3\n";
 332                         return;
 333                 }
 334
 335                 if (actively_recording()) {
 336                         stop_limit = max_frames;
 337                 } else {
 338
 339                         if (Config->get_stop_at_session_end()) {
 340                                 stop_limit = current_end_frame();
 341                         } else {
 342                                 stop_limit = max_frames;
 343                         }
 344                 }
 345
 346                 if (maybe_stop (stop_limit)) {
 347                         no_roll (nframes);
 348                         cerr << "++PWE out 4\n";
 349                         return;
 350                 }
 351
 352                 this_event = *next_event;
 353                 the_next_one = next_event;
 354                 ++the_next_one;
 355
 356
 357                 while (nframes) {
 358
 359                         this_nframes = nframes; /* real (jack) time relative */
 360                         frames_moved = (long) floor (_transport_speed * nframes); /* transport relative */
 361
 362                         /* running an event, position transport precisely to its time */
 363                         if (this_event && this_event->action_frame <= end_frame && this_event->action_frame >= _transport_frame) {
 364                                 /* this isn't quite right for reverse play */
 365                                 frames_moved = (long) (this_event->action_frame - _transport_frame);
 366                                 this_nframes = (nframes_t) abs( floor(frames_moved / _transport_speed) );
 367                         }
 368
 369                         if (this_nframes) {
 370
 371                                 click (_transport_frame, nframes);
 372
 373                                 /* now process frames between now and the first event in this block */
 374                                 prepare_diskstreams ();
 375
 376                                 if (process_routes (this_nframes)) {
 377                                         fail_roll (nframes);
 378                                         cerr << "++PWE out 4\n";
 379                                         return;
 380                                 }
 381
 382                                 commit_diskstreams (this_nframes, session_needs_butler);
 383
 384                                 nframes -= this_nframes;
 385
 386                                 if (frames_moved < 0) {
 387                                         decrement_transport_position (-frames_moved);
 388                                 } else {
 389                                         increment_transport_position (frames_moved);
 390                                 }
 391
 392                                 maybe_stop (stop_limit);
 393                                 check_declick_out ();
 394                         }
 395
 396                         /* reset port offsets so that Port::get_buffer() will fetch the correct data */
 397
 398                         Port::increment_port_offset (this_nframes);
 399
 400                         /* now handle this event and all others scheduled for the same time */
 401
 402                         while (this_event && this_event->action_frame == _transport_frame) {
 403                                 process_event (this_event);
 404
 405                                 if (the_next_one == events.end()) {
 406                                         this_event = 0;
 407                                 } else {
 408                                         this_event = *the_next_one;
 409                                         ++the_next_one;
 410                                 }
 411                         }
 412
 413                         /* if an event left our state changing, do the right thing */
 414
 415                         if (nframes && non_realtime_work_pending()) {
 416                                 no_roll (nframes);
 417                                 break;
 418                         }
 419
 420                         /* this is necessary to handle the case of seamless looping */
 421                         end_frame = _transport_frame + (nframes_t) floor (nframes * _transport_speed);
 422                 }
 423
 424                 set_next_event ();
 425
 426         } /* implicit release of route lock */
 427
 428
 429         if (session_needs_butler) {
 430                 summon_butler ();
 431         }
 432
 433         if (!_engine.freewheeling() && session_send_mtc) {
 434                 send_midi_time_code_in_another_thread ();
 435         }
 436
 437         cerr << "++PWE out 5\n";
 438         return;
 439 }
 440
 441 void
 442 Session::reset_slave_state ()
 443 {
 444         average_slave_delta = 1800;
 445         delta_accumulator_cnt = 0;
 446         have_first_delta_accumulator = false;
 447         slave_state = Stopped;
 448 }
 449
 450 bool
 451 Session::transport_locked () const
 452 {
 453         Slave* sl = _slave;
 454
 455         if (!locate_pending() && ((Config->get_slave_source() == None) || (sl && sl->ok() && sl->locked()))) {
 456                 return true;
 457         }
 458
 459         return false;
 460 }
 461
 462 bool
 463 Session::follow_slave (nframes_t nframes)
 464 {
 465         float slave_speed;
 466         nframes_t slave_transport_frame;
 467         nframes_t this_delta;
 468         int dir;
 469         bool starting;
 470
 471         if (!_slave->ok()) {
 472                 stop_transport ();
 473                 Config->set_slave_source (None);
 474                 goto noroll;
 475         }
 476
 477         _slave->speed_and_position (slave_speed, slave_transport_frame);
 478
 479         if (!_slave->locked()) {
 480                 // cerr << "Slave not locked, not rolling\n";
 481                 goto noroll;
 482         }
 483
 484         if (slave_transport_frame > _transport_frame) {
 485                 this_delta = slave_transport_frame - _transport_frame;
 486                 dir = 1;
 487         } else {
 488                 this_delta = _transport_frame - slave_transport_frame;
 489                 dir = -1;
 490         }
 491
 492         if ((starting = _slave->starting())) {
 493                 slave_speed = 0.0f;
 494         }
 495
 496 #if 0
 497         cerr << "delta = " << (int) (dir * this_delta)
 498              << " speed = " << slave_speed
 499              << " ts = " << _transport_speed
 500              << " M@ "<< slave_transport_frame << " S@ " << _transport_frame
 501              << " avgdelta = " << average_slave_delta
 502              << endl;
 503 #endif
 504
 505         if (_slave->is_always_synced() || Config->get_timecode_source_is_synced()) {
 506
 507                 /* if the TC source is synced, then we assume that its
 508                    speed is binary: 0.0 or 1.0
 509                 */
 510
 511                 if (slave_speed != 0.0f) {
 512                         slave_speed = 1.0f;
 513                 }
 514
 515         } else {
 516
 517                 /* TC source is able to drift relative to us (slave)
 518                    so we need to keep track of the drift and adjust
 519                    our speed to remain locked.
 520                 */
 521
 522                 if (delta_accumulator_cnt >= delta_accumulator_size) {
 523                         have_first_delta_accumulator = true;
 524                         delta_accumulator_cnt = 0;
 525                 }
 526
 527                 if (delta_accumulator_cnt != 0 || this_delta < _current_frame_rate) {
 528                         delta_accumulator[delta_accumulator_cnt++] = dir*this_delta;
 529                 }
 530
 531                 if (have_first_delta_accumulator) {
 532                         average_slave_delta = 0;
 533                         for (int i = 0; i < delta_accumulator_size; ++i) {
 534                                 average_slave_delta += delta_accumulator[i];
 535                         }
 536                         average_slave_delta /= delta_accumulator_size;
 537                         if (average_slave_delta < 0) {
 538                                 average_dir = -1;
 539                                 average_slave_delta = -average_slave_delta;
 540                         } else {
 541                                 average_dir = 1;
 542                         }
 543                         // cerr << "avgdelta = " << average_slave_delta*average_dir << endl;
 544                 }
 545         }
 546
 547         if (slave_speed != 0.0f) {
 548
 549                 /* slave is running */
 550
 551                 switch (slave_state) {
 552                 case Stopped:
 553                         if (_slave->requires_seekahead()) {
 554                                 slave_wait_end = slave_transport_frame + _current_frame_rate;
 555                                 locate (slave_wait_end, false, false);
 556                                 slave_state = Waiting;
 557                                 starting = true;
 558
 559                         } else {
 560
 561                                 slave_state = Running;
 562
 563                                 Location* al = _locations.auto_loop_location();
 564
 565                                 if (al && play_loop && (slave_transport_frame < al->start() || slave_transport_frame > al->end())) {
 566                                         // master has moved outside the loop: stop looping
 567                                         cerr << "Stop looping - master out of range\n";
 568                                         request_play_loop(false);
 569                                 }
 570
 571                                 if (slave_transport_frame != _transport_frame) {
 572                                         locate (slave_transport_frame, false, false);
 573                                 }
 574                         }
 575                         break;
 576
 577                 case Waiting:
 578                         break;
 579
 580                 default:
 581                         break;
 582
 583                 }
 584
 585                 if (slave_state == Waiting) {
 586
 587                         // cerr << "waiting at " << slave_transport_frame << endl;
 588
 589                         if (slave_transport_frame >= slave_wait_end) {
 590                                 // cerr << "\tstart at " << _transport_frame << endl;
 591
 592                                 slave_state = Running;
 593
 594                                 bool ok = true;
 595                                 nframes_t frame_delta = slave_transport_frame - _transport_frame;
 596
 597                                 boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 598
 599                                 for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
 600                                         if (!(*i)->can_internal_playback_seek (frame_delta)) {
 601                                                 ok = false;
 602                                                 break;
 603                                         }
 604                                 }
 605
 606                                 if (ok) {
 607                                         for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
 608                                                 (*i)->internal_playback_seek (frame_delta);
 609                                         }
 610                                         _transport_frame += frame_delta;
 611
 612                                 } else {
 613                                         // cerr << "cannot micro-seek\n";
 614                                         /* XXX what? */
 615                                 }
 616
 617                                 memset (delta_accumulator, 0, sizeof (nframes_t) * delta_accumulator_size);
 618                                 average_slave_delta = 0;
 619                                 this_delta = 0;
 620                         }
 621                 }
 622
 623                 if (slave_state == Running && _transport_speed == 0.0f) {
 624
 625                         // cerr << "slave starts transport\n";
 626
 627                         start_transport ();
 628                 }
 629
 630         } else {
 631
 632                 /* slave has stopped */
 633
 634                 if (_transport_speed != 0.0f) {
 635
 636                         // cerr << "slave stops transport: " << slave_speed << " frame: " << slave_transport_frame
 637                         // << " tf = " << _transport_frame
 638                         // << endl;
 639
 640                         if (Config->get_slave_source() == JACK) {
 641                                 last_stop_frame = _transport_frame;
 642                         }
 643
 644                         stop_transport();
 645                 }
 646
 647                 if (slave_transport_frame != _transport_frame) {
 648                         // cerr << "slave stopped, move to " << slave_transport_frame << endl;
 649                         force_locate (slave_transport_frame, false);
 650                 }
 651
 652                 slave_state = Stopped;
 653         }
 654
 655         if (slave_state == Running && !_slave->is_always_synced() && !Config->get_timecode_source_is_synced()) {
 656
 657
 658                 if (_transport_speed != 0.0f) {
 659
 660                         /*
 661                            note that average_dir is +1 or -1
 662                         */
 663
 664                         const float adjust_seconds = 1.0f;
 665                         float delta;
 666
 667                         //if (average_slave_delta == 0) {
 668                                 delta = this_delta;
 669                                 delta *= dir;
 670 //                      } else {
 671 //                              delta = average_slave_delta;
 672 //                              delta *= average_dir;
 673 //                      }
 674
 675                         float adjusted_speed = slave_speed +
 676                                 (delta / (adjust_seconds * _current_frame_rate));
 677
 678 #if 0
 679                         cerr << "adjust using " << delta
 680                              << " towards " << adjusted_speed
 681                              << " ratio = " << adjusted_speed / slave_speed
 682                              << " current = " << _transport_speed
 683                              << " slave @ " << slave_speed
 684                              << endl;
 685 #endif
 686
 687                         request_transport_speed (adjusted_speed);
 688
 689 #if 1
 690                         if ((nframes_t) average_slave_delta > _slave->resolution()) {
 691                                 // cerr << "not locked\n";
 692                                 goto silent_motion;
 693                         }
 694 #endif
 695                 }
 696         }
 697
 698         if (!starting && !non_realtime_work_pending()) {
 699                 /* speed is set, we're locked, and good to go */
 700                 return true;
 701         }
 702
 703   silent_motion:
 704
 705         if (slave_speed && _transport_speed) {
 706
 707                 /* something isn't right, but we should move with the master
 708                    for now.
 709                 */
 710
 711                 bool need_butler;
 712
 713                 prepare_diskstreams ();
 714                 silent_process_routes (nframes);
 715                 commit_diskstreams (nframes, need_butler);
 716
 717                 if (need_butler) {
 718                         summon_butler ();
 719                 }
 720
 721                 int32_t frames_moved = (int32_t) floor (_transport_speed * nframes);
 722
 723                 if (frames_moved < 0) {
 724                         decrement_transport_position (-frames_moved);
 725                 } else {
 726                         increment_transport_position (frames_moved);
 727                 }
 728
 729                 nframes_t stop_limit;
 730
 731                 if (actively_recording()) {
 732                         stop_limit = max_frames;
 733                 } else {
 734                         if (Config->get_stop_at_session_end()) {
 735                                 stop_limit = current_end_frame();
 736                         } else {
 737                                 stop_limit = max_frames;
 738                         }
 739                 }
 740
 741                 maybe_stop (stop_limit);
 742         }
 743
 744   noroll:
 745         /* don't move at all */
 746         no_roll (nframes);
 747         return false;
 748 }
 749
 750 void
 751 Session::process_without_events (nframes_t nframes)
 752 {
 753         bool session_needs_butler = false;
 754         nframes_t stop_limit;
 755         long frames_moved;
 756
 757         cerr << "++PwE\n";
 758
 759         if (!process_can_proceed()) {
 760                 _silent = true;
 761                 return;
 762         }
 763
 764         if (!_exporting && _slave) {
 765                 if (!follow_slave (nframes)) {
 766                         cerr << "++PwE out 1\n";
 767                         return;
 768                 }
 769         }
 770
 771         if (_transport_speed == 0) {
 772                 fail_roll (nframes);
 773                 cerr << "++PwE out 2\n";
 774                 return;
 775         }
 776
 777         if (actively_recording()) {
 778                 stop_limit = max_frames;
 779         } else {
 780                 if (Config->get_stop_at_session_end()) {
 781                         stop_limit = current_end_frame();
 782                 } else {
 783                         stop_limit = max_frames;
 784                 }
 785         }
 786
 787         if (maybe_stop (stop_limit)) {
 788                 no_roll (nframes);
 789                 cerr << "++PwE out 2\n";
 790                 return;
 791         }
 792
 793         if (maybe_sync_start (nframes)) {
 794                 cerr << "++PwE out 3\n";
 795                 return;
 796         }
 797
 798         click (_transport_frame, nframes);
 799
 800         prepare_diskstreams ();
 801
 802         frames_moved = (long) floor (_transport_speed * nframes);
 803
 804         if (process_routes (nframes)) {
 805                 fail_roll (nframes);
 806                 cerr << "++PwE out 4\n";
 807                 return;
 808         }
 809
 810         commit_diskstreams (nframes, session_needs_butler);
 811
 812         if (frames_moved < 0) {
 813                 decrement_transport_position (-frames_moved);
 814         } else {
 815                 increment_transport_position (frames_moved);
 816         }
 817
 818         maybe_stop (stop_limit);
 819         check_declick_out ();
 820
 821         if (session_needs_butler) {
 822                 summon_butler ();
 823         }
 824
 825         if (!_engine.freewheeling() && session_send_mtc) {
 826                 send_midi_time_code_in_another_thread ();
 827         }
 828
 829         cerr << "++PwE out 5\n";
 830         return;
 831 }
 832
 833 void
 834 Session::process_audition (nframes_t nframes)
 835 {
 836         Event* ev;
 837         boost::shared_ptr<RouteList> r = routes.reader ();
 838
 839         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 840                 if (!(*i)->hidden()) {
 841                         (*i)->silence (nframes);
 842                 }
 843         }
 844
 845         /* run the auditioner, and if it says we need butler service, ask for it */
 846
 847         if (auditioner->play_audition (nframes) > 0) {
 848                 summon_butler ();
 849         }
 850
 851         /* handle pending events */
 852
 853         while (pending_events.read (&ev, 1) == 1) {
 854                 merge_event (ev);
 855         }
 856
 857         /* if we are not in the middle of a state change,
 858            and there are immediate events queued up,
 859            process them.
 860         */
 861
 862         while (!non_realtime_work_pending() && !immediate_events.empty()) {
 863                 Event *ev = immediate_events.front ();
 864                 immediate_events.pop_front ();
 865                 process_event (ev);
 866         }
 867
 868         if (!auditioner->active()) {
 869                 cerr << "P1 pf = pwe\n";
 870                 process_function = &Session::process_with_events;
 871         }
 872 }
 873
 874 bool
 875 Session::maybe_sync_start (nframes_t& nframes)
 876 {
 877         nframes_t sync_offset;
 878
 879         if (!waiting_for_sync_offset) {
 880                 return false;
 881         }
 882
 883         if (_engine.get_sync_offset (sync_offset) && sync_offset < nframes) {
 884
 885                 /* generate silence up to the sync point, then
 886                    adjust nframes + offset to reflect whatever
 887                    is left to do.
 888                 */
 889
 890                 no_roll (sync_offset);
 891                 nframes -= sync_offset;
 892                 Port::increment_port_offset (sync_offset);
 893                 waiting_for_sync_offset = false;
 894
 895                 if (nframes == 0) {
 896                         return true; // done, nothing left to process
 897                 }
 898
 899         } else {
 900
 901                 /* sync offset point is not within this process()
 902                    cycle, so just generate silence. and don't bother
 903                    with any fancy stuff here, just the minimal silence.
 904                 */
 905
 906                 _silent = true;
 907
 908                 if (Config->get_locate_while_waiting_for_sync()) {
 909                         if (micro_locate (nframes)) {
 910                                 /* XXX ERROR !!! XXX */
 911                         }
 912                 }
 913
 914                 return true; // done, nothing left to process
 915         }
 916
 917         return false;
 918 }
 919