libs/ardour/audioengine.cc

   1 /*
   2     Copyright (C) 2002 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include <unistd.h>
  21 #include <cerrno>
  22 #include <vector>
  23 #include <exception>
  24 #include <stdexcept>
  25 #include <sstream>
  26
  27 #include <glibmm/timer.h>
  28 #include <jack/jack.h>
  29 #include <jack/thread.h>
  30
  31 #include "pbd/pthread_utils.h"
  32 #include "pbd/stacktrace.h"
  33 #include "pbd/unknown_type.h"
  34
  35 #include "midi++/jack.h"
  36
  37 #include "ardour/amp.h"
  38 #include "ardour/audio_port.h"
  39 #include "ardour/audioengine.h"
  40 #include "ardour/buffer.h"
  41 #include "ardour/buffer_set.h"
  42 #include "ardour/cycle_timer.h"
  43 #include "ardour/delivery.h"
  44 #include "ardour/event_type_map.h"
  45 #include "ardour/internal_return.h"
  46 #include "ardour/io.h"
  47 #include "ardour/meter.h"
  48 #include "ardour/midi_port.h"
  49 #include "ardour/process_thread.h"
  50 #include "ardour/port.h"
  51 #include "ardour/port_set.h"
  52 #include "ardour/session.h"
  53 #include "ardour/timestamps.h"
  54 #include "ardour/utils.h"
  55
  56 #include "i18n.h"
  57
  58 using namespace std;
  59 using namespace ARDOUR;
  60 using namespace PBD;
  61
  62 gint AudioEngine::m_meter_exit;
  63 AudioEngine* AudioEngine::_instance = 0;
  64
  65 #define GET_PRIVATE_JACK_POINTER(j)  jack_client_t* _priv_jack = (jack_client_t*) (j); if (!_priv_jack) { return; }
  66 #define GET_PRIVATE_JACK_POINTER_RET(j,r) jack_client_t* _priv_jack = (jack_client_t*) (j); if (!_priv_jack) { return r; }
  67
  68 AudioEngine::AudioEngine (string client_name, string session_uuid)
  69         : ports (new Ports)
  70 {
  71         _instance = this; /* singleton */
  72
  73         session_remove_pending = false;
  74         _running = false;
  75         _has_run = false;
  76         last_monitor_check = 0;
  77         monitor_check_interval = max_frames;
  78         _processed_frames = 0;
  79         _usecs_per_cycle = 0;
  80         _jack = 0;
  81         _frame_rate = 0;
  82         _buffer_size = 0;
  83         _freewheeling = false;
  84         _main_thread = 0;
  85
  86         m_meter_thread = 0;
  87         g_atomic_int_set (&m_meter_exit, 0);
  88
  89         if (connect_to_jack (client_name, session_uuid)) {
  90                 throw NoBackendAvailable ();
  91         }
  92
  93         Port::set_engine (this);
  94
  95         // Initialize parameter metadata (e.g. ranges)
  96         Evoral::Parameter p(NullAutomation);
  97         p = EventTypeMap::instance().new_parameter(NullAutomation);
  98         p = EventTypeMap::instance().new_parameter(GainAutomation);
  99         p = EventTypeMap::instance().new_parameter(PanAutomation);
 100         p = EventTypeMap::instance().new_parameter(PluginAutomation);
 101         p = EventTypeMap::instance().new_parameter(SoloAutomation);
 102         p = EventTypeMap::instance().new_parameter(MuteAutomation);
 103         p = EventTypeMap::instance().new_parameter(MidiCCAutomation);
 104         p = EventTypeMap::instance().new_parameter(MidiPgmChangeAutomation);
 105         p = EventTypeMap::instance().new_parameter(MidiPitchBenderAutomation);
 106         p = EventTypeMap::instance().new_parameter(MidiChannelPressureAutomation);
 107         p = EventTypeMap::instance().new_parameter(FadeInAutomation);
 108         p = EventTypeMap::instance().new_parameter(FadeOutAutomation);
 109         p = EventTypeMap::instance().new_parameter(EnvelopeAutomation);
 110         p = EventTypeMap::instance().new_parameter(MidiCCAutomation);
 111 }
 112
 113 AudioEngine::~AudioEngine ()
 114 {
 115         {
 116                 Glib::Mutex::Lock tm (_process_lock);
 117                 session_removed.signal ();
 118
 119                 if (_running) {
 120                         jack_client_close (_jack);
 121                         _jack = 0;
 122                 }
 123
 124                 stop_metering_thread ();
 125         }
 126 }
 127
 128 jack_client_t*
 129 AudioEngine::jack() const
 130 {
 131         return _jack;
 132 }
 133
 134 void
 135 _thread_init_callback (void * /*arg*/)
 136 {
 137         /* make sure that anybody who needs to know about this thread
 138            knows about it.
 139         */
 140
 141         pthread_set_name (X_("audioengine"));
 142
 143         PBD::notify_gui_about_thread_creation ("gui", pthread_self(), X_("Audioengine"), 4096);
 144         PBD::notify_gui_about_thread_creation ("midiui", pthread_self(), X_("Audioengine"), 128);
 145
 146         SessionEvent::create_per_thread_pool (X_("Audioengine"), 512);
 147
 148         MIDI::JACK_MidiPort::set_process_thread (pthread_self());
 149 }
 150
 151 typedef void (*_JackInfoShutdownCallback)(jack_status_t code, const char* reason, void *arg);
 152
 153 static void (*on_info_shutdown)(jack_client_t*, _JackInfoShutdownCallback, void *);
 154 extern void jack_on_info_shutdown (jack_client_t*, _JackInfoShutdownCallback, void *) __attribute__((weak));
 155
 156 static void check_jack_symbols () __attribute__((constructor));
 157
 158 void check_jack_symbols ()
 159 {
 160        /* use weak linking to see if we really have various late-model JACK function */
 161        on_info_shutdown = jack_on_info_shutdown;
 162 }
 163
 164 static void
 165 ardour_jack_error (const char* msg)
 166 {
 167         error << "JACK: " << msg << endmsg;
 168 }
 169
 170 int
 171 AudioEngine::start ()
 172 {
 173         GET_PRIVATE_JACK_POINTER_RET (_jack, -1);
 174
 175         if (!_running) {
 176
 177                 nframes_t blocksize = jack_get_buffer_size (_priv_jack);
 178
 179                 if (_session) {
 180                         BootMessage (_("Connect session to engine"));
 181
 182                         _session->set_block_size (blocksize);
 183                         _session->set_frame_rate (jack_get_sample_rate (_priv_jack));
 184
 185                         /* page in as much of the session process code as we
 186                            can before we really start running.
 187                         */
 188
 189                         _session->process (blocksize);
 190                         _session->process (blocksize);
 191                         _session->process (blocksize);
 192                         _session->process (blocksize);
 193                         _session->process (blocksize);
 194                         _session->process (blocksize);
 195                         _session->process (blocksize);
 196                         _session->process (blocksize);
 197                 }
 198
 199                 _processed_frames = 0;
 200                 last_monitor_check = 0;
 201
 202                 if (on_info_shutdown) {
 203                         jack_on_info_shutdown (_priv_jack, halted_info, this);
 204                 } else {
 205                         jack_on_shutdown (_priv_jack, halted, this);
 206                 }
 207                 jack_set_graph_order_callback (_priv_jack, _graph_order_callback, this);
 208                 jack_set_thread_init_callback (_priv_jack, _thread_init_callback, this);
 209                 // jack_set_process_callback (_priv_jack, _process_callback, this);
 210                 jack_set_process_thread (_priv_jack, _process_thread, this);
 211                 jack_set_sample_rate_callback (_priv_jack, _sample_rate_callback, this);
 212                 jack_set_buffer_size_callback (_priv_jack, _bufsize_callback, this);
 213                 jack_set_xrun_callback (_priv_jack, _xrun_callback, this);
 214 #ifdef HAVE_JACK_SESSION
 215                 if( jack_set_session_callback )
 216                     jack_set_session_callback (_priv_jack, _session_callback, this);
 217 #endif
 218                 jack_set_sync_callback (_priv_jack, _jack_sync_callback, this);
 219                 jack_set_freewheel_callback (_priv_jack, _freewheel_callback, this);
 220                 jack_set_port_registration_callback (_priv_jack, _registration_callback, this);
 221                 jack_set_port_connect_callback (_priv_jack, _connect_callback, this);
 222
 223                 if (_session && _session->config.get_jack_time_master()) {
 224                         jack_set_timebase_callback (_priv_jack, 0, _jack_timebase_callback, this);
 225                 }
 226
 227                 jack_set_error_function (ardour_jack_error);
 228
 229                 if (jack_activate (_priv_jack) == 0) {
 230                         _running = true;
 231                         _has_run = true;
 232                         Running(); /* EMIT SIGNAL */
 233                 } else {
 234                         // error << _("cannot activate JACK client") << endmsg;
 235                 }
 236
 237                 _raw_buffer_sizes[DataType::AUDIO] = blocksize * sizeof(float);
 238
 239                 jack_port_t* midi_port = jack_port_register (_priv_jack, "m", JACK_DEFAULT_MIDI_TYPE, JackPortIsOutput, 0);
 240                 if (!midi_port) {
 241                         error << _("Cannot create temporary MIDI port to determine MIDI buffer size") << endmsg;
 242                 } else {
 243                         _raw_buffer_sizes[DataType::MIDI] = jack_midi_max_event_size (jack_port_get_buffer(midi_port, blocksize));
 244                         cerr << "MIDI port buffers = " << _raw_buffer_sizes[DataType::MIDI] << endl;
 245                         jack_port_unregister (_priv_jack, midi_port);
 246                 }
 247         }
 248
 249         return _running ? 0 : -1;
 250 }
 251
 252 int
 253 AudioEngine::stop (bool forever)
 254 {
 255         GET_PRIVATE_JACK_POINTER_RET (_jack, -1);
 256
 257         if (_priv_jack) {
 258                 if (forever) {
 259                         disconnect_from_jack ();
 260                 } else {
 261                         jack_deactivate (_priv_jack);
 262                         Stopped(); /* EMIT SIGNAL */
 263                         MIDI::JACK_MidiPort::JackHalted (); /* EMIT SIGNAL */
 264                 }
 265         }
 266
 267         return _running ? -1 : 0;
 268 }
 269
 270
 271 bool
 272 AudioEngine::get_sync_offset (nframes_t& offset) const
 273 {
 274
 275 #ifdef HAVE_JACK_VIDEO_SUPPORT
 276
 277         GET_PRIVATE_JACK_POINTER_RET (_jack, false);
 278
 279         jack_position_t pos;
 280
 281         if (_priv_jack) {
 282                 (void) jack_transport_query (_priv_jack, &pos);
 283
 284                 if (pos.valid & JackVideoFrameOffset) {
 285                         offset = pos.video_offset;
 286                         return true;
 287                 }
 288         }
 289 #else
 290         /* keep gcc happy */
 291         offset = 0;
 292 #endif
 293
 294         return false;
 295 }
 296
 297 void
 298 AudioEngine::_jack_timebase_callback (jack_transport_state_t state, nframes_t nframes,
 299                                       jack_position_t* pos, int new_position, void *arg)
 300 {
 301         static_cast<AudioEngine*> (arg)->jack_timebase_callback (state, nframes, pos, new_position);
 302 }
 303
 304 void
 305 AudioEngine::jack_timebase_callback (jack_transport_state_t state, nframes_t nframes,
 306                                      jack_position_t* pos, int new_position)
 307 {
 308         if (_jack && _session && _session->synced_to_jack()) {
 309                 _session->jack_timebase_callback (state, nframes, pos, new_position);
 310         }
 311 }
 312
 313 int
 314 AudioEngine::_jack_sync_callback (jack_transport_state_t state, jack_position_t* pos, void* arg)
 315 {
 316         return static_cast<AudioEngine*> (arg)->jack_sync_callback (state, pos);
 317 }
 318
 319 int
 320 AudioEngine::jack_sync_callback (jack_transport_state_t state, jack_position_t* pos)
 321 {
 322         if (_jack && _session) {
 323                 return _session->jack_sync_callback (state, pos);
 324         }
 325
 326         return true;
 327 }
 328
 329 int
 330 AudioEngine::_xrun_callback (void *arg)
 331 {
 332         AudioEngine* ae = static_cast<AudioEngine*> (arg);
 333         if (ae->connected()) {
 334                 ae->Xrun (); /* EMIT SIGNAL */
 335         }
 336         return 0;
 337 }
 338
 339 #ifdef HAVE_JACK_SESSION
 340 void
 341 AudioEngine::_session_callback (jack_session_event_t *event, void *arg)
 342 {
 343         printf( "helo.... " );
 344         AudioEngine* ae = static_cast<AudioEngine*> (arg);
 345         if (ae->connected()) {
 346                 ae->JackSessionEvent ( event ); /* EMIT SIGNAL */
 347         }
 348 }
 349 #endif
 350 int
 351 AudioEngine::_graph_order_callback (void *arg)
 352 {
 353         AudioEngine* ae = static_cast<AudioEngine*> (arg);
 354         if (ae->connected()) {
 355                 ae->GraphReordered (); /* EMIT SIGNAL */
 356         }
 357         return 0;
 358 }
 359
 360 /** Wrapped which is called by JACK as its process callback.  It is just
 361  * here to get us back into C++ land by calling AudioEngine::process_callback()
 362  * @param nframes Number of frames passed by JACK.
 363  * @param arg User argument passed by JACK, which will be the AudioEngine*.
 364  */
 365 int
 366 AudioEngine::_process_callback (nframes_t nframes, void *arg)
 367 {
 368         return static_cast<AudioEngine *> (arg)->process_callback (nframes);
 369 }
 370
 371 void*
 372 AudioEngine::_process_thread (void *arg)
 373 {
 374         return static_cast<AudioEngine *> (arg)->process_thread ();
 375 }
 376
 377 void
 378 AudioEngine::_freewheel_callback (int onoff, void *arg)
 379 {
 380         static_cast<AudioEngine*>(arg)->_freewheeling = onoff;
 381 }
 382
 383 void
 384 AudioEngine::_registration_callback (jack_port_id_t /*id*/, int /*reg*/, void* arg)
 385 {
 386         AudioEngine* ae = static_cast<AudioEngine*> (arg);
 387         ae->PortRegisteredOrUnregistered (); /* EMIT SIGNAL */
 388 }
 389
 390 void
 391 AudioEngine::_connect_callback (jack_port_id_t /*id_a*/, jack_port_id_t /*id_b*/, int /*conn*/, void* arg)
 392 {
 393         AudioEngine* ae = static_cast<AudioEngine*> (arg);
 394         ae->PortConnectedOrDisconnected (); /* EMIT SIGNAL */
 395 }
 396
 397 void
 398 AudioEngine::split_cycle (nframes_t offset)
 399 {
 400         /* caller must hold process lock */
 401
 402         Port::increment_port_offset (offset);
 403
 404         /* tell all Ports that we're going to start a new (split) cycle */
 405
 406         boost::shared_ptr<Ports> p = ports.reader();
 407
 408         for (Ports::iterator i = p->begin(); i != p->end(); ++i) {
 409                 (*i)->cycle_split ();
 410         }
 411 }
 412
 413 void
 414 AudioEngine::finish_process_cycle (int status)
 415 {
 416         GET_PRIVATE_JACK_POINTER(_jack);
 417         jack_cycle_signal (_jack, 0);
 418 }
 419
 420 void*
 421 AudioEngine::process_thread ()
 422 {
 423         /* JACK doesn't do this for us when we use the wait API
 424          */
 425
 426         _thread_init_callback (0);
 427
 428         _main_thread = new ProcessThread;
 429
 430         while (1) {
 431                 GET_PRIVATE_JACK_POINTER_RET(_jack,0);
 432                 jack_nframes_t nframes = jack_cycle_wait (_jack);
 433
 434                 if (process_callback (nframes)) {
 435                         cerr << "--- process\n";
 436                         return 0;
 437                 }
 438
 439                 finish_process_cycle (0);
 440         }
 441
 442         return 0;
 443 }
 444
 445 /** Method called by JACK (via _process_callback) which says that there
 446  * is work to be done.
 447  * @param nframes Number of frames to process.
 448  */
 449 int
 450 AudioEngine::process_callback (nframes_t nframes)
 451 {
 452         GET_PRIVATE_JACK_POINTER_RET(_jack,0);
 453         // CycleTimer ct ("AudioEngine::process");
 454         Glib::Mutex::Lock tm (_process_lock, Glib::TRY_LOCK);
 455
 456         /// The number of frames that will have been processed when we've finished
 457         nframes_t next_processed_frames;
 458
 459         /* handle wrap around of total frames counter */
 460
 461         if (max_frames - _processed_frames < nframes) {
 462                 next_processed_frames = nframes - (max_frames - _processed_frames);
 463         } else {
 464                 next_processed_frames = _processed_frames + nframes;
 465         }
 466
 467         if (!tm.locked() || _session == 0) {
 468                 /* return having done nothing */
 469                 _processed_frames = next_processed_frames;
 470                 return 0;
 471         }
 472
 473         if (session_remove_pending) {
 474                 /* perform the actual session removal */
 475                 _session = 0;
 476                 session_remove_pending = false;
 477                 session_removed.signal();
 478                 _processed_frames = next_processed_frames;
 479                 return 0;
 480         }
 481
 482         /* tell all relevant objects that we're starting a new cycle */
 483
 484         Delivery::CycleStart (nframes);
 485         Port::set_port_offset (0);
 486         InternalReturn::CycleStart (nframes);
 487
 488         /* tell all Ports that we're starting a new cycle */
 489
 490         boost::shared_ptr<Ports> p = ports.reader();
 491
 492         for (Ports::iterator i = p->begin(); i != p->end(); ++i) {
 493                 (*i)->cycle_start (nframes);
 494         }
 495
 496         if (_freewheeling) {
 497                 /* emit the Freewheel signal and stop freewheeling in the event of trouble
 498                  */
 499                 boost::optional<int> r = Freewheel (nframes);
 500                 if (r.get_value_or (0)) {
 501                         jack_set_freewheel (_priv_jack, false);
 502                 }
 503
 504         } else {
 505                 if (_session) {
 506                         _session->process (nframes);
 507
 508                 }
 509         }
 510
 511         if (_freewheeling) {
 512                 return 0;
 513         }
 514
 515         if (!_running) {
 516                 _processed_frames = next_processed_frames;
 517                 return 0;
 518         }
 519
 520         if (last_monitor_check + monitor_check_interval < next_processed_frames) {
 521
 522                 boost::shared_ptr<Ports> p = ports.reader();
 523
 524                 for (Ports::iterator i = p->begin(); i != p->end(); ++i) {
 525
 526                         Port *port = (*i);
 527                         bool x;
 528
 529                         if (port->_last_monitor != (x = port->monitoring_input ())) {
 530                                 port->_last_monitor = x;
 531                                 /* XXX I think this is dangerous, due to
 532                                    a likely mutex in the signal handlers ...
 533                                 */
 534                                  port->MonitorInputChanged (x); /* EMIT SIGNAL */
 535                         }
 536                 }
 537                 last_monitor_check = next_processed_frames;
 538         }
 539
 540         if (_session->silent()) {
 541
 542                 boost::shared_ptr<Ports> p = ports.reader();
 543
 544                 for (Ports::iterator i = p->begin(); i != p->end(); ++i) {
 545
 546                         Port *port = (*i);
 547
 548                         if (port->sends_output()) {
 549                                 port->get_buffer(nframes).silence(nframes);
 550                         }
 551                 }
 552         }
 553
 554         // Finalize ports
 555
 556         for (Ports::iterator i = p->begin(); i != p->end(); ++i) {
 557                 (*i)->cycle_end (nframes);
 558         }
 559
 560         _processed_frames = next_processed_frames;
 561         return 0;
 562 }
 563
 564 int
 565 AudioEngine::_sample_rate_callback (nframes_t nframes, void *arg)
 566 {
 567         return static_cast<AudioEngine *> (arg)->jack_sample_rate_callback (nframes);
 568 }
 569
 570 int
 571 AudioEngine::jack_sample_rate_callback (nframes_t nframes)
 572 {
 573         _frame_rate = nframes;
 574         _usecs_per_cycle = (int) floor ((((double) frames_per_cycle() / nframes)) * 1000000.0);
 575
 576         /* check for monitor input change every 1/10th of second */
 577
 578         monitor_check_interval = nframes / 10;
 579         last_monitor_check = 0;
 580
 581         if (_session) {
 582                 _session->set_frame_rate (nframes);
 583         }
 584
 585         SampleRateChanged (nframes); /* EMIT SIGNAL */
 586
 587         return 0;
 588 }
 589
 590 int
 591 AudioEngine::_bufsize_callback (nframes_t nframes, void *arg)
 592 {
 593         return static_cast<AudioEngine *> (arg)->jack_bufsize_callback (nframes);
 594 }
 595
 596 int
 597 AudioEngine::jack_bufsize_callback (nframes_t nframes)
 598 {
 599         bool need_midi_size = true;
 600         bool need_audio_size = true;
 601
 602         _buffer_size = nframes;
 603         _usecs_per_cycle = (int) floor ((((double) nframes / frame_rate())) * 1000000.0);
 604         last_monitor_check = 0;
 605
 606         boost::shared_ptr<Ports> p = ports.reader();
 607
 608         /* crude guesses, see below where we try to get the right answers.
 609
 610            Note that our guess for MIDI deliberatey tries to overestimate
 611            by a little. It would be nicer if we could get the actual
 612            size from a port, but we have to use this estimate in the
 613            event that there are no MIDI ports currently. If there are
 614            the value will be adjusted below.
 615          */
 616
 617         _raw_buffer_sizes[DataType::AUDIO] = nframes * sizeof (Sample);
 618         _raw_buffer_sizes[DataType::MIDI] = nframes * 4 - (nframes/2);
 619
 620         for (Ports::iterator i = p->begin(); i != p->end(); ++i) {
 621
 622                 if (need_audio_size && (*i)->type() == DataType::AUDIO) {
 623                         _raw_buffer_sizes[DataType::AUDIO] = (*i)->raw_buffer_size (nframes);
 624                         need_audio_size = false;
 625                 }
 626
 627
 628                 if (need_midi_size && (*i)->type() == DataType::MIDI) {
 629                         _raw_buffer_sizes[DataType::MIDI] = (*i)->raw_buffer_size (nframes);
 630                         need_midi_size = false;
 631                 }
 632
 633                 (*i)->reset();
 634         }
 635
 636         if (_session) {
 637                 _session->set_block_size (_buffer_size);
 638         }
 639
 640         return 0;
 641 }
 642
 643 void
 644 AudioEngine::stop_metering_thread ()
 645 {
 646         if (m_meter_thread) {
 647                 g_atomic_int_set (&m_meter_exit, 1);
 648                 m_meter_thread->join ();
 649                 m_meter_thread = 0;
 650         }
 651 }
 652
 653 void
 654 AudioEngine::start_metering_thread ()
 655 {
 656         if (m_meter_thread == 0) {
 657                 g_atomic_int_set (&m_meter_exit, 0);
 658                 m_meter_thread = Glib::Thread::create (boost::bind (&AudioEngine::meter_thread, this),
 659                                                        500000, true, true, Glib::THREAD_PRIORITY_NORMAL);
 660         }
 661 }
 662
 663 void
 664 AudioEngine::meter_thread ()
 665 {
 666         pthread_set_name (X_("meter"));
 667
 668         while (true) {
 669                 Glib::usleep (10000); /* 1/100th sec interval */
 670                 if (g_atomic_int_get(&m_meter_exit)) {
 671                         break;
 672                 }
 673                 Metering::Meter ();
 674         }
 675 }
 676
 677 void
 678 AudioEngine::set_session (Session *s)
 679 {
 680         Glib::Mutex::Lock pl (_process_lock);
 681
 682         SessionHandlePtr::set_session (s);
 683
 684         if (_session) {
 685
 686                 start_metering_thread ();
 687
 688                 nframes_t blocksize = jack_get_buffer_size (_jack);
 689
 690                 /* page in as much of the session process code as we
 691                    can before we really start running.
 692                 */
 693
 694                 boost::shared_ptr<Ports> p = ports.reader();
 695
 696                 for (Ports::iterator i = p->begin(); i != p->end(); ++i) {
 697                         (*i)->cycle_start (blocksize);
 698                 }
 699
 700                 _session->process (blocksize);
 701                 _session->process (blocksize);
 702                 _session->process (blocksize);
 703                 _session->process (blocksize);
 704                 _session->process (blocksize);
 705                 _session->process (blocksize);
 706                 _session->process (blocksize);
 707                 _session->process (blocksize);
 708
 709                 for (Ports::iterator i = p->begin(); i != p->end(); ++i) {
 710                         (*i)->cycle_end (blocksize);
 711                 }
 712         }
 713 }
 714
 715 void
 716 AudioEngine::remove_session ()
 717 {
 718         Glib::Mutex::Lock lm (_process_lock);
 719
 720         if (_running) {
 721
 722                 stop_metering_thread ();
 723
 724                 if (_session) {
 725                         session_remove_pending = true;
 726                         session_removed.wait(_process_lock);
 727                 }
 728
 729         } else {
 730                 SessionHandlePtr::set_session (0);
 731         }
 732
 733         remove_all_ports ();
 734 }
 735
 736 void
 737 AudioEngine::port_registration_failure (const std::string& portname)
 738 {
 739         GET_PRIVATE_JACK_POINTER (_jack);
 740         string full_portname = jack_client_name;
 741         full_portname += ':';
 742         full_portname += portname;
 743
 744
 745         jack_port_t* p = jack_port_by_name (_priv_jack, full_portname.c_str());
 746         string reason;
 747
 748         if (p) {
 749                 reason = string_compose (_("a port with the name \"%1\" already exists: check for duplicated track/bus names"), portname);
 750         } else {
 751                 reason = string_compose (_("No more JACK ports are available. You will need to stop %1 and restart JACK with ports if you need this many tracks."), PROGRAM_NAME);
 752         }
 753
 754         throw PortRegistrationFailure (string_compose (_("AudioEngine: cannot register port \"%1\": %2"), portname, reason).c_str());
 755 }
 756
 757 Port *
 758 AudioEngine::register_port (DataType dtype, const string& portname, bool input)
 759 {
 760         Port* newport = 0;
 761
 762         try {
 763                 if (dtype == DataType::AUDIO) {
 764                         newport = new AudioPort (portname, (input ? Port::IsInput : Port::IsOutput));
 765                 } else if (dtype == DataType::MIDI) {
 766                         newport = new MidiPort (portname, (input ? Port::IsInput : Port::IsOutput));
 767                 } else {
 768                         throw PortRegistrationFailure("unable to create port (unknown type)");
 769                 }
 770
 771                 size_t& old_buffer_size  = _raw_buffer_sizes[newport->type()];
 772                 size_t  port_buffer_size = newport->raw_buffer_size(0);
 773                 if (port_buffer_size > old_buffer_size) {
 774                         old_buffer_size = port_buffer_size;
 775                 }
 776
 777                 RCUWriter<Ports> writer (ports);
 778                 boost::shared_ptr<Ports> ps = writer.get_copy ();
 779                 ps->insert (ps->begin(), newport);
 780
 781                 /* writer goes out of scope, forces update */
 782
 783                 return newport;
 784         }
 785
 786         catch (PortRegistrationFailure& err) {
 787                 throw err;
 788         } catch (std::exception& e) {
 789                 throw PortRegistrationFailure(string_compose(
 790                                 _("unable to create port: %1"), e.what()).c_str());
 791         } catch (...) {
 792                 throw PortRegistrationFailure("unable to create port (unknown error)");
 793         }
 794 }
 795
 796 Port *
 797 AudioEngine::register_input_port (DataType type, const string& portname)
 798 {
 799         return register_port (type, portname, true);
 800 }
 801
 802 Port *
 803 AudioEngine::register_output_port (DataType type, const string& portname)
 804 {
 805         return register_port (type, portname, false);
 806 }
 807
 808 int
 809 AudioEngine::unregister_port (Port& port)
 810 {
 811         /* caller must hold process lock */
 812
 813         if (!_running) {
 814                 /* probably happening when the engine has been halted by JACK,
 815                    in which case, there is nothing we can do here.
 816                    */
 817                 return 0;
 818         }
 819
 820         {
 821                 RCUWriter<Ports> writer (ports);
 822                 boost::shared_ptr<Ports> ps = writer.get_copy ();
 823
 824                 for (Ports::iterator i = ps->begin(); i != ps->end(); ++i) {
 825                         if ((*i) == &port) {
 826                                 delete *i;
 827                                 ps->erase (i);
 828                                 break;
 829                         }
 830                 }
 831
 832                 /* writer goes out of scope, forces update */
 833         }
 834
 835         return 0;
 836 }
 837
 838 int
 839 AudioEngine::connect (const string& source, const string& destination)
 840 {
 841         /* caller must hold process lock */
 842
 843         int ret;
 844
 845         if (!_running) {
 846                 if (!_has_run) {
 847                         fatal << _("connect called before engine was started") << endmsg;
 848                         /*NOTREACHED*/
 849                 } else {
 850                         return -1;
 851                 }
 852         }
 853
 854         string s = make_port_name_non_relative (source);
 855         string d = make_port_name_non_relative (destination);
 856
 857
 858         Port* src = get_port_by_name_locked (s);
 859         Port* dst = get_port_by_name_locked (d);
 860
 861         if (src) {
 862                 ret = src->connect (d);
 863         } else if (dst) {
 864                 ret = dst->connect (s);
 865         } else {
 866                 /* neither port is known to us, and this API isn't intended for use as a general patch bay */
 867                 ret = -1;
 868         }
 869
 870         if (ret > 0) {
 871                 /* already exists - no error, no warning */
 872         } else if (ret < 0) {
 873                 error << string_compose(_("AudioEngine: cannot connect %1 (%2) to %3 (%4)"),
 874                                         source, s, destination, d)
 875                       << endmsg;
 876         }
 877
 878         return ret;
 879 }
 880
 881 int
 882 AudioEngine::disconnect (const string& source, const string& destination)
 883 {
 884         /* caller must hold process lock */
 885
 886         int ret;
 887
 888         if (!_running) {
 889                 if (!_has_run) {
 890                         fatal << _("disconnect called before engine was started") << endmsg;
 891                         /*NOTREACHED*/
 892                 } else {
 893                         return -1;
 894                 }
 895         }
 896
 897         string s = make_port_name_non_relative (source);
 898         string d = make_port_name_non_relative (destination);
 899
 900         Port* src = get_port_by_name_locked (s);
 901         Port* dst = get_port_by_name_locked (d);
 902
 903         if (src) {
 904                         ret = src->disconnect (d);
 905         } else if (dst) {
 906                         ret = dst->disconnect (s);
 907         } else {
 908                 /* neither port is known to us, and this API isn't intended for use as a general patch bay */
 909                 ret = -1;
 910         }
 911         return ret;
 912 }
 913
 914 int
 915 AudioEngine::disconnect (Port& port)
 916 {
 917         GET_PRIVATE_JACK_POINTER_RET (_jack,-1);
 918
 919         if (!_running) {
 920                 if (!_has_run) {
 921                         fatal << _("disconnect called before engine was started") << endmsg;
 922                         /*NOTREACHED*/
 923                 } else {
 924                         return -1;
 925                 }
 926         }
 927
 928         return port.disconnect_all ();
 929 }
 930
 931 ARDOUR::nframes_t
 932 AudioEngine::frame_rate () const
 933 {
 934         GET_PRIVATE_JACK_POINTER_RET (_jack,0);
 935         if (_frame_rate == 0) {
 936           return (_frame_rate = jack_get_sample_rate (_priv_jack));
 937         } else {
 938           return _frame_rate;
 939         }
 940 }
 941
 942 size_t
 943 AudioEngine::raw_buffer_size (DataType t)
 944 {
 945         std::map<DataType,size_t>::const_iterator s = _raw_buffer_sizes.find(t);
 946         return (s != _raw_buffer_sizes.end()) ? s->second : 0;
 947 }
 948
 949 ARDOUR::nframes_t
 950 AudioEngine::frames_per_cycle () const
 951 {
 952         GET_PRIVATE_JACK_POINTER_RET (_jack,0);
 953         if (_buffer_size == 0) {
 954           return (_buffer_size = jack_get_buffer_size (_jack));
 955         } else {
 956           return _buffer_size;
 957         }
 958 }
 959
 960 /** @param name Full name of port (including prefix:)
 961  *  @return Corresponding Port*, or 0.  This object remains the property of the AudioEngine
 962  *  so must not be deleted.
 963  */
 964 Port *
 965 AudioEngine::get_port_by_name (const string& portname)
 966 {
 967         string s;
 968         if (portname.find_first_of (':') == string::npos) {
 969                 s = make_port_name_non_relative (portname);
 970         } else {
 971                 s = portname;
 972         }
 973
 974         Glib::Mutex::Lock lm (_process_lock);
 975         return get_port_by_name_locked (s);
 976 }
 977
 978 Port *
 979 AudioEngine::get_port_by_name_locked (const string& portname)
 980 {
 981         /* caller must hold process lock */
 982
 983         if (!_running) {
 984                 if (!_has_run) {
 985                         fatal << _("get_port_by_name_locked() called before engine was started") << endmsg;
 986                         /*NOTREACHED*/
 987                 } else {
 988                         return 0;
 989                 }
 990         }
 991
 992         if (portname.substr (0, jack_client_name.length ()) != jack_client_name) {
 993                 /* not an ardour: port */
 994                 return 0;
 995         }
 996
 997         std::string const rel = make_port_name_relative (portname);
 998
 999         boost::shared_ptr<Ports> pr = ports.reader();
1000
1001         for (Ports::iterator i = pr->begin(); i != pr->end(); ++i) {
1002                 if (rel == (*i)->name()) {
1003                         return *i;
1004                 }
1005         }
1006
1007         return 0;
1008 }
1009
1010 const char **
1011 AudioEngine::get_ports (const string& port_name_pattern, const string& type_name_pattern, uint32_t flags)
1012 {
1013         GET_PRIVATE_JACK_POINTER_RET (_jack,0);
1014         if (!_running) {
1015                 if (!_has_run) {
1016                         fatal << _("get_ports called before engine was started") << endmsg;
1017                         /*NOTREACHED*/
1018                 } else {
1019                         return 0;
1020                 }
1021         }
1022         return jack_get_ports (_priv_jack, port_name_pattern.c_str(), type_name_pattern.c_str(), flags);
1023 }
1024
1025 void
1026 AudioEngine::halted_info (jack_status_t code, const char* reason, void *arg)
1027 {
1028         /* called from jack shutdown handler  */
1029
1030         AudioEngine* ae = static_cast<AudioEngine *> (arg);
1031         bool was_running = ae->_running;
1032
1033         ae->stop_metering_thread ();
1034
1035         ae->_running = false;
1036         ae->_buffer_size = 0;
1037         ae->_frame_rate = 0;
1038         ae->_jack = 0;
1039
1040         if (was_running) {
1041 #ifdef HAVE_JACK_ON_INFO_SHUTDOWN
1042                 switch (code) {
1043                 case JackBackendError:
1044                         ae->Halted(reason); /* EMIT SIGNAL */
1045                         break;
1046                 default:
1047                         ae->Halted(""); /* EMIT SIGNAL */
1048                 }
1049 #else
1050                 ae->Halted(""); /* EMIT SIGNAL */
1051 #endif
1052         }
1053 }
1054
1055 void
1056 AudioEngine::halted (void *arg)
1057 {
1058         cerr << "HALTED by JACK\n";
1059
1060         /* called from jack shutdown handler  */
1061
1062         AudioEngine* ae = static_cast<AudioEngine *> (arg);
1063         bool was_running = ae->_running;
1064
1065         ae->stop_metering_thread ();
1066
1067         ae->_running = false;
1068         ae->_buffer_size = 0;
1069         ae->_frame_rate = 0;
1070         ae->_jack = 0;
1071
1072         if (was_running) {
1073                 ae->Halted(""); /* EMIT SIGNAL */
1074                 MIDI::JACK_MidiPort::JackHalted (); /* EMIT SIGNAL */
1075         }
1076 }
1077
1078 void
1079 AudioEngine::died ()
1080 {
1081         /* called from a signal handler for SIGPIPE */
1082
1083         stop_metering_thread ();
1084
1085         _running = false;
1086         _buffer_size = 0;
1087         _frame_rate = 0;
1088         _jack = 0;
1089 }
1090
1091 bool
1092 AudioEngine::can_request_hardware_monitoring ()
1093 {
1094         GET_PRIVATE_JACK_POINTER_RET (_jack,false);
1095         const char ** ports;
1096
1097         if ((ports = jack_get_ports (_priv_jack, NULL, JACK_DEFAULT_AUDIO_TYPE, JackPortCanMonitor)) == 0) {
1098                 return false;
1099         }
1100
1101         free (ports);
1102
1103         return true;
1104 }
1105
1106
1107 uint32_t
1108 AudioEngine::n_physical_outputs (DataType type) const
1109 {
1110         GET_PRIVATE_JACK_POINTER_RET (_jack,0);
1111         const char ** ports;
1112         uint32_t cnt = 0;
1113
1114         if ((ports = jack_get_ports (_priv_jack, NULL, type.to_jack_type(), JackPortIsPhysical|JackPortIsInput)) == 0) {
1115                 return 0;
1116         }
1117
1118         for (uint32_t i = 0; ports[i]; ++i) {
1119                 if (!strstr (ports[i], "Midi-Through")) {
1120                         cnt++;
1121                 }
1122         }
1123
1124         free (ports);
1125
1126         return cnt;
1127 }
1128
1129 uint32_t
1130 AudioEngine::n_physical_inputs (DataType type) const
1131 {
1132         GET_PRIVATE_JACK_POINTER_RET (_jack,0);
1133         const char ** ports;
1134         uint32_t cnt = 0;
1135
1136         if ((ports = jack_get_ports (_priv_jack, NULL, type.to_jack_type(), JackPortIsPhysical|JackPortIsOutput)) == 0) {
1137                 return 0;
1138         }
1139
1140         for (uint32_t i = 0; ports[i]; ++i) {
1141                 if (!strstr (ports[i], "Midi-Through")) {
1142                         cnt++;
1143                 }
1144         }
1145
1146         free (ports);
1147
1148         return cnt;
1149 }
1150
1151 void
1152 AudioEngine::get_physical_inputs (DataType type, vector<string>& ins)
1153 {
1154         GET_PRIVATE_JACK_POINTER (_jack);
1155         const char ** ports;
1156
1157         if ((ports = jack_get_ports (_priv_jack, NULL, type.to_jack_type(), JackPortIsPhysical|JackPortIsOutput)) == 0) {
1158                 return;
1159         }
1160
1161         if (ports) {
1162                 for (uint32_t i = 0; ports[i]; ++i) {
1163                         if (strstr (ports[i], "Midi-Through")) {
1164                                 continue;
1165                         }
1166                         ins.push_back (ports[i]);
1167                 }
1168                 free (ports);
1169         }
1170 }
1171
1172 void
1173 AudioEngine::get_physical_outputs (DataType type, vector<string>& outs)
1174 {
1175         GET_PRIVATE_JACK_POINTER (_jack);
1176         const char ** ports;
1177         uint32_t i = 0;
1178
1179         if ((ports = jack_get_ports (_priv_jack, NULL, type.to_jack_type(), JackPortIsPhysical|JackPortIsInput)) == 0) {
1180                 return;
1181         }
1182
1183         for (i = 0; ports[i]; ++i) {
1184                 if (strstr (ports[i], "Midi-Through")) {
1185                         continue;
1186                 }
1187                 outs.push_back (ports[i]);
1188         }
1189         free (ports);
1190 }
1191
1192 string
1193 AudioEngine::get_nth_physical (DataType type, uint32_t n, int flag)
1194 {
1195         GET_PRIVATE_JACK_POINTER_RET (_jack,"");
1196         const char ** ports;
1197         uint32_t i;
1198         uint32_t idx;
1199         string ret;
1200
1201         assert(type != DataType::NIL);
1202
1203         if ((ports = jack_get_ports (_priv_jack, NULL, type.to_jack_type(), JackPortIsPhysical|flag)) == 0) {
1204                 return ret;
1205         }
1206
1207         for (i = 0, idx = 0; idx < n && ports[i]; ++i) {
1208                 if (!strstr (ports[i], "Midi-Through")) {
1209                         ++idx;
1210                 }
1211         }
1212
1213         if (ports[idx]) {
1214                 ret = ports[idx];
1215         }
1216
1217         free ((const char **) ports);
1218
1219         return ret;
1220 }
1221
1222 void
1223 AudioEngine::update_total_latency (const Port& port)
1224 {
1225         port.recompute_total_latency ();
1226 }
1227
1228 void
1229 AudioEngine::transport_stop ()
1230 {
1231         GET_PRIVATE_JACK_POINTER (_jack);
1232         jack_transport_stop (_priv_jack);
1233 }
1234
1235 void
1236 AudioEngine::transport_start ()
1237 {
1238         GET_PRIVATE_JACK_POINTER (_jack);
1239         jack_transport_start (_priv_jack);
1240 }
1241
1242 void
1243 AudioEngine::transport_locate (nframes_t where)
1244 {
1245         GET_PRIVATE_JACK_POINTER (_jack);
1246         // cerr << "tell JACK to locate to " << where << endl;
1247         jack_transport_locate (_priv_jack, where);
1248 }
1249
1250 AudioEngine::TransportState
1251 AudioEngine::transport_state ()
1252 {
1253         GET_PRIVATE_JACK_POINTER_RET (_jack, ((TransportState) JackTransportStopped));
1254         jack_position_t pos;
1255         return (TransportState) jack_transport_query (_priv_jack, &pos);
1256 }
1257
1258 int
1259 AudioEngine::reset_timebase ()
1260 {
1261         GET_PRIVATE_JACK_POINTER_RET (_jack, -1);
1262         if (_session) {
1263                 if (_session->config.get_jack_time_master()) {
1264                         return jack_set_timebase_callback (_priv_jack, 0, _jack_timebase_callback, this);
1265                 } else {
1266                         return jack_release_timebase (_jack);
1267                 }
1268         }
1269         return 0;
1270 }
1271
1272 int
1273 AudioEngine::freewheel (bool onoff)
1274 {
1275         GET_PRIVATE_JACK_POINTER_RET (_jack, -1);
1276
1277         if (onoff != _freewheeling) {
1278                 return jack_set_freewheel (_priv_jack, onoff);
1279
1280         } else {
1281                 /* already doing what has been asked for */
1282                 return 0;
1283         }
1284 }
1285
1286 void
1287 AudioEngine::remove_all_ports ()
1288 {
1289         /* process lock MUST be held */
1290
1291         {
1292                 RCUWriter<Ports> writer (ports);
1293                 boost::shared_ptr<Ports> ps = writer.get_copy ();
1294
1295                 for (Ports::iterator i = ps->begin(); i != ps->end(); ++i) {
1296                         delete *i;
1297                 }
1298
1299                 ps->clear ();
1300         }
1301
1302         /* clear dead wood list too */
1303
1304         ports.flush ();
1305 }
1306
1307 int
1308 AudioEngine::connect_to_jack (string client_name, string session_uuid)
1309 {
1310         jack_options_t options = JackNullOption;
1311         jack_status_t status;
1312         const char *server_name = NULL;
1313
1314         jack_client_name = client_name; /* might be reset below */
1315 #ifdef HAVE_JACK_SESSION
1316         if (! session_uuid.empty())
1317             _jack = jack_client_open (jack_client_name.c_str(), JackSessionID, &status, session_uuid.c_str());
1318         else
1319 #endif
1320             _jack = jack_client_open (jack_client_name.c_str(), options, &status, server_name);
1321
1322         if (_jack == NULL) {
1323                 // error message is not useful here
1324                 return -1;
1325         }
1326
1327         GET_PRIVATE_JACK_POINTER_RET (_jack, -1);
1328
1329         if (status & JackNameNotUnique) {
1330                 jack_client_name = jack_get_client_name (_priv_jack);
1331         }
1332
1333         return 0;
1334 }
1335
1336 int
1337 AudioEngine::disconnect_from_jack ()
1338 {
1339         GET_PRIVATE_JACK_POINTER_RET (_jack, 0);
1340
1341         if (_running) {
1342                 stop_metering_thread ();
1343         }
1344
1345         {
1346                 Glib::Mutex::Lock lm (_process_lock);
1347                 jack_client_close (_priv_jack);
1348                 _jack = 0;
1349         }
1350
1351         _buffer_size = 0;
1352         _frame_rate = 0;
1353         _raw_buffer_sizes.clear();
1354
1355         if (_running) {
1356                 _running = false;
1357                 Stopped(); /* EMIT SIGNAL */
1358                 MIDI::JACK_MidiPort::JackHalted (); /* EMIT SIGNAL */
1359         }
1360
1361         return 0;
1362 }
1363
1364 int
1365 AudioEngine::reconnect_to_jack ()
1366 {
1367         if (_running) {
1368                 disconnect_from_jack ();
1369                 /* XXX give jackd a chance */
1370                 Glib::usleep (250000);
1371         }
1372
1373         if (connect_to_jack (jack_client_name, "")) {
1374                 error << _("failed to connect to JACK") << endmsg;
1375                 return -1;
1376         }
1377
1378         Ports::iterator i;
1379
1380         boost::shared_ptr<Ports> p = ports.reader ();
1381
1382         for (i = p->begin(); i != p->end(); ++i) {
1383                 if ((*i)->reestablish ()) {
1384                         break;
1385                 }
1386         }
1387
1388         if (i != p->end()) {
1389                 /* failed */
1390                 remove_all_ports ();
1391                 return -1;
1392         }
1393
1394         GET_PRIVATE_JACK_POINTER_RET (_jack,-1);
1395
1396         if (_session) {
1397                 _session->reset_jack_connection (_priv_jack);
1398                 jack_bufsize_callback (jack_get_buffer_size (_priv_jack));
1399                 _session->set_frame_rate (jack_get_sample_rate (_priv_jack));
1400         }
1401
1402         last_monitor_check = 0;
1403
1404         jack_on_shutdown (_priv_jack, halted, this);
1405         jack_set_graph_order_callback (_priv_jack, _graph_order_callback, this);
1406         jack_set_thread_init_callback (_priv_jack, _thread_init_callback, this);
1407         // jack_set_process_callback (_priv_jack, _process_callback, this);
1408         jack_set_process_thread (_priv_jack, _process_thread, this);
1409         jack_set_sample_rate_callback (_priv_jack, _sample_rate_callback, this);
1410         jack_set_buffer_size_callback (_priv_jack, _bufsize_callback, this);
1411         jack_set_xrun_callback (_priv_jack, _xrun_callback, this);
1412 #ifdef HAVE_JACK_SESSION
1413         if( jack_set_session_callback )
1414             jack_set_session_callback (_priv_jack, _session_callback, this);
1415 #endif
1416         jack_set_sync_callback (_priv_jack, _jack_sync_callback, this);
1417         jack_set_freewheel_callback (_priv_jack, _freewheel_callback, this);
1418
1419         if (_session && _session->config.get_jack_time_master()) {
1420                 jack_set_timebase_callback (_priv_jack, 0, _jack_timebase_callback, this);
1421         }
1422
1423         if (jack_activate (_priv_jack) == 0) {
1424                 _running = true;
1425                 _has_run = true;
1426         } else {
1427                 return -1;
1428         }
1429
1430         /* re-establish connections */
1431
1432         for (i = p->begin(); i != p->end(); ++i) {
1433                 (*i)->reconnect ();
1434         }
1435
1436         Running (); /* EMIT SIGNAL*/
1437
1438         start_metering_thread ();
1439
1440         return 0;
1441 }
1442
1443 int
1444 AudioEngine::request_buffer_size (nframes_t nframes)
1445 {
1446         GET_PRIVATE_JACK_POINTER_RET (_jack, -1);
1447
1448         if (nframes == jack_get_buffer_size (_priv_jack)) {
1449           return 0;
1450         }
1451
1452         return jack_set_buffer_size (_priv_jack, nframes);
1453 }
1454
1455 void
1456 AudioEngine::update_total_latencies ()
1457 {
1458 #ifdef HAVE_JACK_RECOMPUTE_LATENCIES
1459         GET_PRIVATE_JACK_POINTER (_jack);
1460         jack_recompute_total_latencies (_priv_jack);
1461 #endif
1462 }
1463
1464 string
1465 AudioEngine::make_port_name_relative (string portname)
1466 {
1467         string::size_type len;
1468         string::size_type n;
1469
1470         len = portname.length();
1471
1472         for (n = 0; n < len; ++n) {
1473                 if (portname[n] == ':') {
1474                         break;
1475                 }
1476         }
1477
1478         if ((n != len) && (portname.substr (0, n) == jack_client_name)) {
1479                 return portname.substr (n+1);
1480         }
1481
1482         return portname;
1483 }
1484
1485 string
1486 AudioEngine::make_port_name_non_relative (string portname)
1487 {
1488         string str;
1489
1490         if (portname.find_first_of (':') != string::npos) {
1491                 return portname;
1492         }
1493
1494         str  = jack_client_name;
1495         str += ':';
1496         str += portname;
1497
1498         return str;
1499 }
1500
1501 bool
1502 AudioEngine::is_realtime () const
1503 {
1504         GET_PRIVATE_JACK_POINTER_RET (_jack,false);
1505         return jack_is_realtime (_priv_jack);
1506 }
1507
1508 pthread_t
1509 AudioEngine::create_process_thread (boost::function<void()> f, size_t stacksize)
1510 {
1511         GET_PRIVATE_JACK_POINTER_RET (_jack, 0);
1512         pthread_t thread;
1513         ThreadData* td = new ThreadData (this, f, stacksize);
1514
1515         if (jack_client_create_thread (_priv_jack, &thread, jack_client_real_time_priority (_priv_jack),
1516                                        jack_is_realtime (_priv_jack), _start_process_thread, td)) {
1517                 return -1;
1518         }
1519
1520         return thread;
1521 }
1522
1523 void*
1524 AudioEngine::_start_process_thread (void* arg)
1525 {
1526         ThreadData* td = reinterpret_cast<ThreadData*> (arg);
1527         boost::function<void()> f = td->f;
1528         delete td;
1529
1530         f ();
1531
1532         return 0;
1533 }