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
  27 #include <glibmm/thread.h>
  28
  29 #include "ardour/ardour.h"
  30 #include "ardour/audio_diskstream.h"
  31 #include "ardour/audioengine.h"
  32 #include "ardour/auditioner.h"
  33 #include "ardour/butler.h"
  34 #include "ardour/debug.h"
  35 #include "ardour/session.h"
  36 #include "ardour/slave.h"
  37 #include "ardour/timestamps.h"
  38
  39 #include "midi++/manager.h"
  40
  41 #include "i18n.h"
  42
  43 using namespace ARDOUR;
  44 using namespace PBD;
  45 using namespace std;
  46
  47 /** Called by the audio engine when there is work to be done with JACK.
  48  * @param nframes Number of frames to process.
  49  */
  50 void
  51 Session::process (nframes_t nframes)
  52 {
  53         // This is no more the appropriate place to call cycle
  54         // start. cycle_start needs to be called at the Route::roll()
  55         // where the signals which we want to mixdown have been calculated.
  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         (this->*process_function) (nframes);
  73
  74         // the ticker is for sending time information like MidiClock
  75         nframes_t transport_frames = transport_frame();
  76         BBT_Time  transport_bbt;
  77         bbt_time(transport_frames, transport_bbt);
  78         Timecode::Time transport_timecode;
  79         timecode_time(transport_frames, transport_timecode);
  80         tick (transport_frames, transport_bbt, transport_timecode); /* EMIT SIGNAL */
  81
  82         SendFeedback (); /* EMIT SIGNAL */
  83
  84         MIDI::Manager::instance()->cycle_end();
  85 }
  86
  87 void
  88 Session::prepare_diskstreams ()
  89 {
  90         boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
  91         for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
  92                 (*i)->prepare ();
  93         }
  94 }
  95
  96 int
  97 Session::fail_roll (nframes_t nframes)
  98 {
  99         return no_roll (nframes);
 100 }
 101
 102 int
 103 Session::no_roll (nframes_t nframes)
 104 {
 105         nframes_t end_frame = _transport_frame + nframes; // FIXME: varispeed + no_roll ??
 106         int ret = 0;
 107         bool declick = get_transport_declick_required();
 108         boost::shared_ptr<RouteList> r = routes.reader ();
 109
 110         if (_click_io) {
 111                 _click_io->silence (nframes);
 112         }
 113
 114         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 115
 116                 if ((*i)->is_hidden()) {
 117                         continue;
 118                 }
 119
 120                 (*i)->set_pending_declick (declick);
 121
 122                 if ((*i)->no_roll (nframes, _transport_frame, end_frame, non_realtime_work_pending(),
 123                                    actively_recording(), declick)) {
 124                         error << string_compose(_("Session: error in no roll for %1"), (*i)->name()) << endmsg;
 125                         ret = -1;
 126                         break;
 127                 }
 128         }
 129
 130         return ret;
 131 }
 132
 133 int
 134 Session::process_routes (nframes_t nframes)
 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 nframes_t start_frame = _transport_frame;
 149         const nframes_t end_frame = _transport_frame + (nframes_t)floor(nframes * _transport_speed);
 150
 151         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 152
 153                 int ret;
 154
 155                 if ((*i)->is_hidden()) {
 156                         continue;
 157                 }
 158
 159                 (*i)->set_pending_declick (declick);
 160
 161                 if ((ret = (*i)->roll (nframes, start_frame, end_frame, declick, record_active, rec_monitors)) < 0) {
 162
 163                         /* we have to do this here. Route::roll() for an AudioTrack will have called AudioDiskstream::process(),
 164                            and the DS will expect AudioDiskstream::commit() to be called. but we're aborting from that
 165                            call path, so make sure we release any outstanding locks here before we return failure.
 166                         */
 167
 168                         boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 169                         for (DiskstreamList::iterator ids = dsl->begin(); ids != dsl->end(); ++ids) {
 170                                 (*ids)->recover ();
 171                         }
 172
 173                         stop_transport ();
 174                         return -1;
 175                 }
 176         }
 177
 178         return 0;
 179 }
 180
 181 int
 182 Session::silent_process_routes (nframes_t nframes)
 183 {
 184         bool record_active = actively_recording();
 185         int  declick = get_transport_declick_required();
 186         bool rec_monitors = get_rec_monitors_input();
 187         boost::shared_ptr<RouteList> r = routes.reader ();
 188
 189         if (transport_sub_state & StopPendingCapture) {
 190                 /* force a declick out */
 191                 declick = -1;
 192         }
 193
 194         const nframes_t start_frame = _transport_frame;
 195         const nframes_t end_frame = _transport_frame + lrintf(nframes * _transport_speed);
 196
 197         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 198
 199                 int ret;
 200
 201                 if ((*i)->is_hidden()) {
 202                         continue;
 203                 }
 204
 205                 if ((ret = (*i)->silent_roll (nframes, start_frame, end_frame, record_active, rec_monitors)) < 0) {
 206
 207                         /* we have to do this here. Route::roll() for an AudioTrack will have called AudioDiskstream::process(),
 208                            and the DS will expect AudioDiskstream::commit() to be called. but we're aborting from that
 209                            call path, so make sure we release any outstanding locks here before we return failure.
 210                         */
 211
 212                         boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 213                         for (DiskstreamList::iterator ids = dsl->begin(); ids != dsl->end(); ++ids) {
 214                                 (*ids)->recover ();
 215                         }
 216
 217                         stop_transport ();
 218                         return -1;
 219                 }
 220         }
 221
 222         return 0;
 223 }
 224
 225 void
 226 Session::commit_diskstreams (nframes_t nframes, bool &needs_butler)
 227 {
 228         int dret;
 229         float pworst = 1.0f;
 230         float cworst = 1.0f;
 231
 232         boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 233         for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
 234
 235                 if ((*i)->hidden()) {
 236                         continue;
 237                 }
 238
 239                 /* force all diskstreams not handled by a Route to call do their stuff.
 240                    Note: the diskstreams that were handled by a route will just return zero
 241                    from this call, because they know they were processed. So in fact, this
 242                    also runs commit() for every diskstream.
 243                  */
 244
 245                 if ((dret = (*i)->process (_transport_frame, nframes, actively_recording(), get_rec_monitors_input())) == 0) {
 246                         if ((*i)->commit (nframes)) {
 247                                 needs_butler = true;
 248                         }
 249
 250                 } else if (dret < 0) {
 251                         (*i)->recover();
 252                 }
 253
 254                 pworst = min (pworst, (*i)->playback_buffer_load());
 255                 cworst = min (cworst, (*i)->capture_buffer_load());
 256         }
 257
 258         uint32_t pmin = g_atomic_int_get (&_playback_load);
 259         uint32_t pminold = g_atomic_int_get (&_playback_load_min);
 260         uint32_t cmin = g_atomic_int_get (&_capture_load);
 261         uint32_t cminold = g_atomic_int_get (&_capture_load_min);
 262
 263         g_atomic_int_set (&_playback_load, (uint32_t) floor (pworst * 100.0f));
 264         g_atomic_int_set (&_capture_load, (uint32_t) floor (cworst * 100.0f));
 265         g_atomic_int_set (&_playback_load_min, min (pmin, pminold));
 266         g_atomic_int_set (&_capture_load_min, min (cmin, cminold));
 267
 268         if (actively_recording()) {
 269                 set_dirty();
 270         }
 271 }
 272
 273 /** Process callback used when the auditioner is not active */
 274 void
 275 Session::process_with_events (nframes_t nframes)
 276 {
 277         Event*         ev;
 278         nframes_t      this_nframes;
 279         nframes_t      end_frame;
 280         bool           session_needs_butler = false;
 281         nframes_t      stop_limit;
 282         long           frames_moved;
 283
 284         /* make sure the auditioner is silent */
 285
 286         if (auditioner) {
 287                 auditioner->silence (nframes);
 288         }
 289
 290         /* handle any pending events */
 291
 292         while (pending_events.read (&ev, 1) == 1) {
 293                 merge_event (ev);
 294         }
 295
 296         /* if we are not in the middle of a state change,
 297            and there are immediate events queued up,
 298            process them.
 299         */
 300
 301         while (!non_realtime_work_pending() && !immediate_events.empty()) {
 302                 Event *ev = immediate_events.front ();
 303                 immediate_events.pop_front ();
 304                 process_event (ev);
 305         }
 306
 307         /* Events caused a transport change, send an MTC Full Frame (Timecode) message.
 308          * This is sent whether rolling or not, to give slaves an idea of ardour time
 309          * on locates (and allow slow slaves to position and prepare for rolling)
 310          */
 311         if (_send_timecode_update) {
 312                 send_full_time_code(nframes);
 313                 deliver_mmc (MIDI::MachineControl::cmdLocate, _transport_frame);
 314         }
 315
 316         if (!process_can_proceed()) {
 317                 _silent = true;
 318                 return;
 319         }
 320
 321         if (events.empty() || next_event == events.end()) {
 322                 process_without_events (nframes);
 323                 return;
 324         }
 325
 326         if (_transport_speed == 1.0) {
 327                 frames_moved = (long) nframes;
 328         } else {
 329                 interpolation.set_target_speed (fabs(_target_transport_speed));
 330                 interpolation.set_speed (fabs(_transport_speed));
 331                 frames_moved = (long) interpolation.interpolate (0, nframes, 0, 0);
 332         }
 333
 334         end_frame = _transport_frame + (nframes_t)frames_moved;
 335
 336         {
 337                 Event* this_event;
 338                 Events::iterator the_next_one;
 339
 340                 if (!process_can_proceed()) {
 341                         _silent = true;
 342                         return;
 343                 }
 344
 345                 if (!_exporting && _slave) {
 346                         if (!follow_slave (nframes)) {
 347                                 return;
 348                         }
 349                 }
 350
 351                 if (_transport_speed == 0) {
 352                         no_roll (nframes);
 353                         return;
 354                 }
 355
 356                 if (!_exporting) {
 357                         send_midi_time_code_for_cycle (nframes);
 358                 }
 359
 360                 if (actively_recording()) {
 361                         stop_limit = max_frames;
 362                 } else {
 363
 364                         if (Config->get_stop_at_session_end()) {
 365                                 stop_limit = current_end_frame();
 366                         } else {
 367                                 stop_limit = max_frames;
 368                         }
 369                 }
 370
 371                 if (maybe_stop (stop_limit)) {
 372                         no_roll (nframes);
 373                         return;
 374                 }
 375
 376                 this_event = *next_event;
 377                 the_next_one = next_event;
 378                 ++the_next_one;
 379
 380                 /* yes folks, here it is, the actual loop where we really truly
 381                    process some audio
 382                 */
 383
 384                 while (nframes) {
 385
 386                         this_nframes = nframes; /* real (jack) time relative */
 387                         frames_moved = (long) floor (_transport_speed * nframes); /* transport relative */
 388
 389                         /* running an event, position transport precisely to its time */
 390                         if (this_event && this_event->action_frame <= end_frame && this_event->action_frame >= _transport_frame) {
 391                                 /* this isn't quite right for reverse play */
 392                                 frames_moved = (long) (this_event->action_frame - _transport_frame);
 393                                 this_nframes = (nframes_t) abs( floor(frames_moved / _transport_speed) );
 394                         }
 395
 396                         if (this_nframes) {
 397
 398                                 click (_transport_frame, this_nframes);
 399
 400                                 /* now process frames between now and the first event in this block */
 401                                 prepare_diskstreams ();
 402
 403                                 if (process_routes (this_nframes)) {
 404                                         fail_roll (nframes);
 405                                         return;
 406                                 }
 407
 408                                 commit_diskstreams (this_nframes, session_needs_butler);
 409
 410                                 nframes -= this_nframes;
 411
 412                                 if (frames_moved < 0) {
 413                                         decrement_transport_position (-frames_moved);
 414                                 } else {
 415                                         increment_transport_position (frames_moved);
 416                                 }
 417
 418                                 maybe_stop (stop_limit);
 419                                 check_declick_out ();
 420                         }
 421
 422                         _engine.split_cycle (this_nframes);
 423
 424                         /* now handle this event and all others scheduled for the same time */
 425
 426                         while (this_event && this_event->action_frame == _transport_frame) {
 427                                 process_event (this_event);
 428
 429                                 if (the_next_one == events.end()) {
 430                                         this_event = 0;
 431                                 } else {
 432                                         this_event = *the_next_one;
 433                                         ++the_next_one;
 434                                 }
 435                         }
 436
 437                         /* if an event left our state changing, do the right thing */
 438
 439                         if (nframes && non_realtime_work_pending()) {
 440                                 no_roll (nframes);
 441                                 break;
 442                         }
 443
 444                         /* this is necessary to handle the case of seamless looping */
 445                         end_frame = _transport_frame + (nframes_t) floor (nframes * _transport_speed);
 446
 447                 }
 448
 449                 set_next_event ();
 450
 451         } /* implicit release of route lock */
 452
 453         if (session_needs_butler) {
 454                 _butler->summon ();
 455         }
 456 }
 457
 458 void
 459 Session::reset_slave_state ()
 460 {
 461         average_slave_delta = 1800;
 462         delta_accumulator_cnt = 0;
 463         have_first_delta_accumulator = false;
 464         slave_state = Stopped;
 465 }
 466
 467 bool
 468 Session::transport_locked () const
 469 {
 470         Slave* sl = _slave;
 471
 472         if (!locate_pending() && (!config.get_external_sync() || (sl && sl->ok() && sl->locked()))) {
 473                 return true;
 474         }
 475
 476         return false;
 477 }
 478
 479 bool
 480 Session::follow_slave (nframes_t nframes)
 481 {
 482         double slave_speed;
 483         nframes64_t slave_transport_frame;
 484         nframes_t this_delta;
 485         int dir;
 486         bool starting;
 487
 488         if (!_slave->ok()) {
 489                 stop_transport ();
 490                 config.set_external_sync (false);
 491                 goto noroll;
 492         }
 493
 494         _slave->speed_and_position (slave_speed, slave_transport_frame);
 495
 496         DEBUG_TRACE (DEBUG::Slave, string_compose ("Slave @ %2 speed %1\n", slave_speed, slave_transport_frame));
 497
 498         if (!_slave->locked()) {
 499                 goto noroll;
 500         }
 501
 502         if (slave_transport_frame > _transport_frame) {
 503                 this_delta = slave_transport_frame - _transport_frame;
 504                 dir = 1;
 505         } else {
 506                 this_delta = _transport_frame - slave_transport_frame;
 507                 dir = -1;
 508         }
 509
 510         if ((starting = _slave->starting())) {
 511                 slave_speed = 0.0f;
 512         }
 513
 514         if (_slave->is_always_synced() || config.get_timecode_source_is_synced()) {
 515
 516                 /* if the TC source is synced, then we assume that its
 517                    speed is binary: 0.0 or 1.0
 518                 */
 519
 520                 if (slave_speed != 0.0f) {
 521                         slave_speed = 1.0f;
 522                 }
 523
 524         } else {
 525
 526                 /* TC source is able to drift relative to us (slave)
 527                    so we need to keep track of the drift and adjust
 528                    our speed to remain locked.
 529                 */
 530
 531                 calculate_moving_average_of_slave_delta(dir, this_delta);
 532         }
 533
 534         track_slave_state (slave_speed, slave_transport_frame, this_delta, starting);
 535
 536         if (slave_state == Running && !_slave->is_always_synced() && !config.get_timecode_source_is_synced()) {
 537
 538                 if (_transport_speed != 0.0f) {
 539
 540                         /*
 541                            note that average_dir is +1 or -1
 542                         */
 543
 544                         float delta;
 545
 546 #ifdef USE_MOVING_AVERAGE_OF_SLAVE
 547                         if (average_slave_delta == 0) {
 548                                 delta = this_delta;
 549                                 delta *= dir;
 550                         } else {
 551                                 delta = average_slave_delta;
 552                                 delta *= average_dir;
 553                         }
 554 #else
 555                         delta = this_delta;
 556                         delta *= dir;
 557 #endif
 558
 559                         if (fabs(delta) > _slave->resolution() * 2) {
 560                                 /* too far off, so locate and keep rolling */
 561                                 DEBUG_TRACE (DEBUG::Slave, string_compose ("slave delta %1 is too big, locate to %2\n", delta, slave_transport_frame));
 562                                 request_locate (slave_transport_frame, true);
 563                                 return false;
 564                         } else {
 565                                 float adjusted_speed = slave_speed + (delta /  float(_current_frame_rate));
 566
 567                                 if (_slave->give_slave_full_control_over_transport_speed()) {
 568                                         request_transport_speed (slave_speed);
 569                                 } else {
 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
 577                         if (abs(average_slave_delta) > (long) _slave->resolution()) {
 578                                 cerr << "average slave delta greater than slave resolution, going to silent motion\n";
 579                                 goto silent_motion;
 580                         }
 581                 }
 582         }
 583
 584 #ifndef NDEBUG
 585         if (slave_speed != 0.0) {
 586                 DEBUG_TRACE (DEBUG::Slave, string_compose ("delta = %1 speed = %2 ts = %3 M@%4 S@%5 avgdelta %6\n",
 587                                                            (int) (dir * this_delta),
 588                                                            slave_speed,
 589                                                            _transport_speed,
 590                                                            _transport_frame,
 591                                                            slave_transport_frame,
 592                                                            _transport_frame,
 593                                                            average_slave_delta));
 594         }
 595 #endif
 596
 597         if (!starting && !non_realtime_work_pending()) {
 598                 /* speed is set, we're locked, and good to go */
 599                 return true;
 600         }
 601
 602   silent_motion:
 603         DEBUG_TRACE (DEBUG::Slave, "silent motion\n")
 604         follow_slave_silently (nframes, slave_speed);
 605
 606   noroll:
 607         /* don't move at all */
 608         DEBUG_TRACE (DEBUG::Slave, "no roll\n")
 609         no_roll (nframes);
 610         return false;
 611 }
 612
 613 void
 614 Session::calculate_moving_average_of_slave_delta(int dir, nframes_t this_delta)
 615 {
 616         if (delta_accumulator_cnt >= delta_accumulator_size) {
 617                 have_first_delta_accumulator = true;
 618                 delta_accumulator_cnt = 0;
 619         }
 620
 621         if (delta_accumulator_cnt != 0 || this_delta < _current_frame_rate) {
 622                 delta_accumulator[delta_accumulator_cnt++] = long(dir) * long(this_delta);
 623         }
 624
 625         if (have_first_delta_accumulator) {
 626                 average_slave_delta = 0L;
 627                 for (int i = 0; i < delta_accumulator_size; ++i) {
 628                         average_slave_delta += delta_accumulator[i];
 629                 }
 630                 average_slave_delta /= long(delta_accumulator_size);
 631                 if (average_slave_delta < 0L) {
 632                         average_dir = -1;
 633                         average_slave_delta = abs(average_slave_delta);
 634                 } else {
 635                         average_dir = 1;
 636                 }
 637         }
 638 }
 639
 640 void
 641 Session::track_slave_state(
 642                 float slave_speed,
 643                 nframes_t slave_transport_frame,
 644                 nframes_t this_delta,
 645                 bool starting)
 646 {
 647         if (slave_speed != 0.0f) {
 648
 649                 /* slave is running */
 650
 651                 switch (slave_state) {
 652                 case Stopped:
 653                         if (_slave->requires_seekahead()) {
 654                                 slave_wait_end = slave_transport_frame + _current_frame_rate;
 655                                 locate (slave_wait_end, false, false);
 656                                 slave_state = Waiting;
 657                                 starting = true;
 658
 659                         } else {
 660
 661                                 slave_state = Running;
 662
 663                                 Location* al = _locations.auto_loop_location();
 664
 665                                 if (al && play_loop && (slave_transport_frame < al->start() || slave_transport_frame > al->end())) {
 666                                         // cancel looping
 667                                         request_play_loop(false);
 668                                 }
 669
 670                                 if (slave_transport_frame != _transport_frame) {
 671                                         locate (slave_transport_frame, false, false);
 672                                 }
 673                         }
 674                         break;
 675
 676                 case Waiting:
 677                         break;
 678
 679                 default:
 680                         break;
 681
 682                 }
 683
 684                 if (slave_state == Waiting) {
 685
 686                 #ifdef DEBUG_SLAVES
 687                         cerr << "waiting at " << slave_transport_frame << endl;
 688                 #endif
 689                         if (slave_transport_frame >= slave_wait_end) {
 690 #ifdef DEBUG_SLAVES
 691                                 cerr << "\tstart at " << _transport_frame << endl;
 692 #endif
 693                                 slave_state = Running;
 694
 695                                 bool ok = true;
 696                                 nframes_t frame_delta = slave_transport_frame - _transport_frame;
 697
 698                                 boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 699
 700                                 for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
 701                                         if (!(*i)->can_internal_playback_seek (frame_delta)) {
 702                                                 ok = false;
 703                                                 break;
 704                                         }
 705                                 }
 706
 707                                 if (ok) {
 708                                         for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
 709                                                 (*i)->internal_playback_seek (frame_delta);
 710                                         }
 711                                         _transport_frame += frame_delta;
 712
 713                                 } else {
 714                                         cerr << "cannot micro-seek\n";
 715                                         /* XXX what? */
 716                                 }
 717
 718                                 memset (delta_accumulator, 0, sizeof (long) * delta_accumulator_size);
 719                                 average_slave_delta = 0L;
 720                                 this_delta = 0;
 721                         }
 722                 }
 723
 724                 if (slave_state == Running && _transport_speed == 0.0f) {
 725                         DEBUG_TRACE (DEBUG::Slave, "slave starts transport\n");
 726                         start_transport ();
 727                 }
 728
 729         } else { // slave_speed is 0
 730
 731                 /* slave has stopped */
 732
 733                 if (_transport_speed != 0.0f) {
 734                         DEBUG_TRACE (DEBUG::Slave, string_compose ("slave stops transport: %1 frame %2 tf %3\n", slave_speed, slave_transport_frame, _transport_frame));
 735                         stop_transport();
 736                 }
 737
 738                 if (slave_transport_frame != _transport_frame) {
 739                         DEBUG_TRACE (DEBUG::Slave, string_compose ("slave stopped, move to %1\n", slave_transport_frame));
 740                         force_locate (slave_transport_frame, false);
 741                 }
 742
 743                 slave_state = Stopped;
 744         }
 745 }
 746
 747 void
 748 Session::follow_slave_silently (nframes_t nframes, float slave_speed)
 749 {
 750         if (slave_speed && _transport_speed) {
 751
 752                 /* something isn't right, but we should move with the master
 753                    for now.
 754                 */
 755
 756                 bool need_butler;
 757
 758                 prepare_diskstreams ();
 759                 silent_process_routes (nframes);
 760                 commit_diskstreams (nframes, need_butler);
 761
 762                 if (need_butler) {
 763                         _butler->summon ();
 764                 }
 765
 766                 int32_t frames_moved = (int32_t) floor (_transport_speed * nframes);
 767
 768                 if (frames_moved < 0) {
 769                         decrement_transport_position (-frames_moved);
 770                 } else {
 771                         increment_transport_position (frames_moved);
 772                 }
 773
 774                 nframes_t stop_limit;
 775
 776                 if (actively_recording()) {
 777                         stop_limit = max_frames;
 778                 } else {
 779                         if (Config->get_stop_at_session_end()) {
 780                                 stop_limit = current_end_frame();
 781                         } else {
 782                                 stop_limit = max_frames;
 783                         }
 784                 }
 785
 786                 maybe_stop (stop_limit);
 787         }
 788 }
 789
 790 void
 791 Session::process_without_events (nframes_t nframes)
 792 {
 793         bool session_needs_butler = false;
 794         nframes_t stop_limit;
 795         long frames_moved;
 796
 797         if (!process_can_proceed()) {
 798                 _silent = true;
 799                 return;
 800         }
 801
 802         if (!_exporting && _slave) {
 803                 if (!follow_slave (nframes)) {
 804                         return;
 805                 }
 806         }
 807
 808         if (_transport_speed == 0) {
 809                 fail_roll (nframes);
 810                 return;
 811         }
 812
 813         if (!_exporting) {
 814                 send_midi_time_code_for_cycle (nframes);
 815         }
 816
 817         if (actively_recording()) {
 818                 stop_limit = max_frames;
 819         } else {
 820                 if (Config->get_stop_at_session_end()) {
 821                         stop_limit = current_end_frame();
 822                 } else {
 823                         stop_limit = max_frames;
 824                 }
 825         }
 826
 827         if (maybe_stop (stop_limit)) {
 828                 fail_roll (nframes);
 829                 return;
 830         }
 831
 832         if (maybe_sync_start (nframes)) {
 833                 return;
 834         }
 835
 836         click (_transport_frame, nframes);
 837
 838         prepare_diskstreams ();
 839
 840         if (_transport_speed == 1.0) {
 841                 frames_moved = (long) nframes;
 842         } else {
 843                 interpolation.set_target_speed (fabs(_target_transport_speed));
 844                 interpolation.set_speed (fabs(_transport_speed));
 845                 frames_moved = (long) interpolation.interpolate (0, nframes, 0, 0);
 846         }
 847
 848         if (process_routes (nframes)) {
 849                 fail_roll (nframes);
 850                 return;
 851         }
 852
 853         commit_diskstreams (nframes, session_needs_butler);
 854
 855         if (frames_moved < 0) {
 856                 decrement_transport_position (-frames_moved);
 857         } else {
 858                 increment_transport_position (frames_moved);
 859         }
 860
 861         maybe_stop (stop_limit);
 862         check_declick_out ();
 863
 864         if (session_needs_butler) {
 865                 _butler->summon ();
 866         }
 867 }
 868
 869 /** Process callback used when the auditioner is active.
 870  * @param nframes number of frames to process.
 871  */
 872 void
 873 Session::process_audition (nframes_t nframes)
 874 {
 875         Event* ev;
 876         boost::shared_ptr<RouteList> r = routes.reader ();
 877
 878         for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 879                 if (!(*i)->is_hidden()) {
 880                         (*i)->silence (nframes);
 881                 }
 882         }
 883
 884         /* run the auditioner, and if it says we need butler service, ask for it */
 885
 886         if (auditioner->play_audition (nframes) > 0) {
 887                 _butler->summon ();
 888         }
 889
 890         /* handle pending events */
 891
 892         while (pending_events.read (&ev, 1) == 1) {
 893                 merge_event (ev);
 894         }
 895
 896         /* if we are not in the middle of a state change,
 897            and there are immediate events queued up,
 898            process them.
 899         */
 900
 901         while (!non_realtime_work_pending() && !immediate_events.empty()) {
 902                 Event *ev = immediate_events.front ();
 903                 immediate_events.pop_front ();
 904                 process_event (ev);
 905         }
 906
 907         if (!auditioner->active()) {
 908                 /* auditioner no longer active, so go back to the normal process callback */
 909                 process_function = &Session::process_with_events;
 910         }
 911 }
 912
 913 bool
 914 Session::maybe_sync_start (nframes_t& nframes)
 915 {
 916         nframes_t sync_offset;
 917
 918         if (!waiting_for_sync_offset) {
 919                 return false;
 920         }
 921
 922         if (_engine.get_sync_offset (sync_offset) && sync_offset < nframes) {
 923
 924                 /* generate silence up to the sync point, then
 925                    adjust nframes + offset to reflect whatever
 926                    is left to do.
 927                 */
 928
 929                 no_roll (sync_offset);
 930                 nframes -= sync_offset;
 931                 Port::increment_port_offset (sync_offset);
 932                 waiting_for_sync_offset = false;
 933
 934                 if (nframes == 0) {
 935                         return true; // done, nothing left to process
 936                 }
 937
 938         } else {
 939
 940                 /* sync offset point is not within this process()
 941                    cycle, so just generate silence. and don't bother
 942                    with any fancy stuff here, just the minimal silence.
 943                 */
 944
 945                 _silent = true;
 946
 947                 if (Config->get_locate_while_waiting_for_sync()) {
 948                         if (micro_locate (nframes)) {
 949                                 /* XXX ERROR !!! XXX */
 950                         }
 951                 }
 952
 953                 return true; // done, nothing left to process
 954         }
 955
 956         return false;
 957 }
 958