2 Copyright (C) 2002 Paul Davis
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.
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.
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.
25 #include <glibmm/timer.h>
26 #include <pbd/pthread_utils.h>
27 #include <pbd/stacktrace.h>
29 #include <ardour/audioengine.h>
30 #include <ardour/buffer.h>
31 #include <ardour/port.h>
32 #include <ardour/io.h>
33 #include <ardour/session.h>
34 #include <ardour/cycle_timer.h>
35 #include <ardour/utils.h>
37 #include <ardour/timestamps.h>
42 using namespace ARDOUR;
45 gint AudioEngine::m_meter_exit;
48 ardour_jack_error (const char* msg)
50 // throw JACK errors away - they cause visual clutter
51 // error << "JACK: " << msg << endmsg;
54 AudioEngine::AudioEngine (string client_name)
58 session_remove_pending = false;
61 last_monitor_check = 0;
62 monitor_check_interval = max_frames;
63 _processed_frames = 0;
68 _freewheel_thread_registered = false;
69 _freewheeling = false;
72 g_atomic_int_set (&m_meter_exit, 0);
74 if (connect_to_jack (client_name)) {
75 throw NoBackendAvailable ();
79 AudioEngine::~AudioEngine ()
82 Glib::Mutex::Lock tm (_process_lock);
83 session_removed.signal ();
86 jack_client_close (_jack);
90 stop_metering_thread ();
95 _thread_init_callback (void *arg)
97 /* make sure that anybody who needs to know about this thread
101 PBD::notify_gui_about_thread_creation (pthread_self(), X_("Audioengine"), 4096);
105 AudioEngine::start ()
108 error << _("AudioEngine::start() called while disconnected from JACK") << endmsg;
114 nframes_t blocksize = jack_get_buffer_size (_jack);
115 cerr << "pre-run: Set Port buffer size to " << blocksize << endl;
116 Port::set_buffer_size (blocksize);
120 BootMessage (_("Connect session to engine"));
122 session->set_block_size (blocksize);
123 session->set_frame_rate (jack_get_sample_rate (_jack));
125 /* page in as much of the session process code as we
126 can before we really start running.
129 session->process (blocksize);
130 session->process (blocksize);
131 session->process (blocksize);
132 session->process (blocksize);
133 session->process (blocksize);
134 session->process (blocksize);
135 session->process (blocksize);
136 session->process (blocksize);
139 _processed_frames = 0;
140 last_monitor_check = 0;
142 jack_on_shutdown (_jack, halted, this);
143 jack_set_graph_order_callback (_jack, _graph_order_callback, this);
144 jack_set_thread_init_callback (_jack, _thread_init_callback, this);
145 jack_set_process_callback (_jack, _process_callback, this);
146 jack_set_sample_rate_callback (_jack, _sample_rate_callback, this);
147 jack_set_buffer_size_callback (_jack, _bufsize_callback, this);
148 jack_set_xrun_callback (_jack, _xrun_callback, this);
149 jack_set_sync_callback (_jack, _jack_sync_callback, this);
150 jack_set_freewheel_callback (_jack, _freewheel_callback, this);
152 if (Config->get_jack_time_master()) {
153 jack_set_timebase_callback (_jack, 0, _jack_timebase_callback, this);
156 if (jack_activate (_jack) == 0) {
159 Running(); /* EMIT SIGNAL */
161 // error << _("cannot activate JACK client") << endmsg;
164 start_metering_thread();
167 return _running ? 0 : -1;
171 AudioEngine::stop (bool forever)
175 disconnect_from_jack ();
177 jack_deactivate (_jack);
178 Stopped(); /* EMIT SIGNAL */
182 return _running ? -1 : 0;
187 AudioEngine::get_sync_offset (nframes_t& offset) const
190 #ifdef HAVE_JACK_VIDEO_SUPPORT
195 (void) jack_transport_query (_jack, &pos);
197 if (pos.valid & JackVideoFrameOffset) {
198 offset = pos.video_offset;
209 AudioEngine::_jack_timebase_callback (jack_transport_state_t state, nframes_t nframes,
210 jack_position_t* pos, int new_position, void *arg)
212 static_cast<AudioEngine*> (arg)->jack_timebase_callback (state, nframes, pos, new_position);
216 AudioEngine::jack_timebase_callback (jack_transport_state_t state, nframes_t nframes,
217 jack_position_t* pos, int new_position)
219 if (_jack && session && session->synced_to_jack()) {
220 session->jack_timebase_callback (state, nframes, pos, new_position);
225 AudioEngine::_jack_sync_callback (jack_transport_state_t state, jack_position_t* pos, void* arg)
227 return static_cast<AudioEngine*> (arg)->jack_sync_callback (state, pos);
231 AudioEngine::jack_sync_callback (jack_transport_state_t state, jack_position_t* pos)
233 if (_jack && session) {
234 return session->jack_sync_callback (state, pos);
241 AudioEngine::_xrun_callback (void *arg)
243 AudioEngine* ae = static_cast<AudioEngine*> (arg);
244 if (ae->connected()) {
245 ae->Xrun (); /* EMIT SIGNAL */
251 AudioEngine::_graph_order_callback (void *arg)
253 AudioEngine* ae = static_cast<AudioEngine*> (arg);
254 if (ae->connected()) {
255 ae->GraphReordered (); /* EMIT SIGNAL */
261 AudioEngine::_process_callback (nframes_t nframes, void *arg)
263 return static_cast<AudioEngine *> (arg)->process_callback (nframes);
267 AudioEngine::_freewheel_callback (int onoff, void *arg)
269 static_cast<AudioEngine*>(arg)->_freewheeling = onoff;
273 AudioEngine::process_callback (nframes_t nframes)
275 // CycleTimer ct ("AudioEngine::process");
276 Glib::Mutex::Lock tm (_process_lock, Glib::TRY_LOCK);
277 nframes_t next_processed_frames;
279 /* handle wrap around of total frames counter */
281 if (max_frames - _processed_frames < nframes) {
282 next_processed_frames = nframes - (max_frames - _processed_frames);
284 next_processed_frames = _processed_frames + nframes;
287 if (!tm.locked() || session == 0) {
288 _processed_frames = next_processed_frames;
292 if (session_remove_pending) {
294 session_remove_pending = false;
295 session_removed.signal();
296 _processed_frames = next_processed_frames;
300 /* reset port buffer offset for the start of a new cycle */
302 Port::set_port_offset (0);
304 /* tell all IO objects that we're starting a new cycle */
306 IO::CycleStart (nframes);
309 if (Freewheel (nframes)) {
310 jack_set_freewheel (_jack, false);
315 session->process (nframes);
318 /* we were zombified, maybe because a ladspa plugin took
319 too long, or jackd exited, or something like that.
322 _processed_frames = next_processed_frames;
326 if (last_monitor_check + monitor_check_interval < next_processed_frames) {
328 boost::shared_ptr<Ports> p = ports.reader();
330 for (Ports::iterator i = p->begin(); i != p->end(); ++i) {
335 if (port->_last_monitor != (x = port->monitoring_input ())) {
336 port->_last_monitor = x;
337 /* XXX I think this is dangerous, due to
338 a likely mutex in the signal handlers ...
340 port->MonitorInputChanged (x); /* EMIT SIGNAL */
343 last_monitor_check = next_processed_frames;
346 if (session->silent()) {
348 boost::shared_ptr<Ports> p = ports.reader();
350 for (Ports::iterator i = p->begin(); i != p->end(); ++i) {
354 if (port->sends_output()) {
355 Sample *buf = port->get_buffer (nframes);
356 memset (buf, 0, sizeof(Sample) * nframes);
357 // this should work but doesn't
358 //port->silence(0, nframes); //need to implement declicking fade
363 _processed_frames = next_processed_frames;
368 AudioEngine::_sample_rate_callback (nframes_t nframes, void *arg)
370 return static_cast<AudioEngine *> (arg)->jack_sample_rate_callback (nframes);
374 AudioEngine::jack_sample_rate_callback (nframes_t nframes)
376 _frame_rate = nframes;
377 _usecs_per_cycle = (int) floor ((((double) frames_per_cycle() / nframes)) * 1000000.0);
379 /* check for monitor input change every 1/10th of second */
381 monitor_check_interval = nframes / 10;
382 last_monitor_check = 0;
385 session->set_frame_rate (nframes);
388 SampleRateChanged (nframes); /* EMIT SIGNAL */
394 AudioEngine::_bufsize_callback (nframes_t nframes, void *arg)
396 return static_cast<AudioEngine *> (arg)->jack_bufsize_callback (nframes);
400 AudioEngine::jack_bufsize_callback (nframes_t nframes)
402 _buffer_size = nframes;
403 _usecs_per_cycle = (int) floor ((((double) nframes / frame_rate())) * 1000000.0);
404 last_monitor_check = 0;
406 cerr << "bufsize: Set Port buffer size to " << nframes << endl;
407 Port::set_buffer_size (nframes);
409 boost::shared_ptr<Ports> p = ports.reader();
411 for (Ports::iterator i = p->begin(); i != p->end(); ++i) {
416 session->set_block_size (_buffer_size);
423 AudioEngine::stop_metering_thread ()
425 if (m_meter_thread) {
426 g_atomic_int_set (&m_meter_exit, 1);
427 m_meter_thread->join ();
433 AudioEngine::start_metering_thread ()
435 if (m_meter_thread == 0) {
436 g_atomic_int_set (&m_meter_exit, 0);
437 m_meter_thread = Glib::Thread::create (sigc::mem_fun(this, &AudioEngine::meter_thread),
438 500000, true, true, Glib::THREAD_PRIORITY_NORMAL);
443 AudioEngine::meter_thread ()
446 Glib::usleep (10000); /* 1/100th sec interval */
447 if (g_atomic_int_get(&m_meter_exit)) {
450 IO::update_meters ();
455 AudioEngine::set_session (Session *s)
457 Glib::Mutex::Lock pl (_process_lock);
463 nframes_t blocksize = jack_get_buffer_size (_jack);
465 /* page in as much of the session process code as we
466 can before we really start running.
469 session->process (blocksize);
470 session->process (blocksize);
471 session->process (blocksize);
472 session->process (blocksize);
473 session->process (blocksize);
474 session->process (blocksize);
475 session->process (blocksize);
476 session->process (blocksize);
481 AudioEngine::remove_session ()
483 Glib::Mutex::Lock lm (_process_lock);
488 session_remove_pending = true;
489 session_removed.wait(_process_lock);
500 AudioEngine::port_registration_failure (const std::string& portname)
502 string full_portname = jack_client_name;
503 full_portname += ':';
504 full_portname += portname;
507 jack_port_t* p = jack_port_by_name (_jack, full_portname.c_str());
511 reason = string_compose (_("a port with the name \"%1\" already exists: check for duplicated track/bus names"), portname);
513 reason = _("No more JACK ports are available. You will need to stop Ardour and restart JACK with ports if you need this many tracks.");
516 throw PortRegistrationFailure (string_compose (_("AudioEngine: cannot register port \"%1\": %2"), portname, reason).c_str());
520 AudioEngine::register_input_port (DataType type, const string& portname)
524 fatal << _("register input port called before engine was started") << endmsg;
531 jack_port_t *p = jack_port_register (_jack, portname.c_str(), type.to_jack_type(), JackPortIsInput, 0);
537 if ((newport = new Port (p)) != 0) {
538 RCUWriter<Ports> writer (ports);
539 boost::shared_ptr<Ports> ps = writer.get_copy ();
540 ps->insert (ps->begin(), newport);
541 /* writer goes out of scope, forces update */
547 port_registration_failure (portname);
554 AudioEngine::register_output_port (DataType type, const string& portname)
558 fatal << _("register output port called before engine was started") << endmsg;
567 if ((p = jack_port_register (_jack, portname.c_str(),
568 type.to_jack_type(), JackPortIsOutput, 0)) != 0) {
573 RCUWriter<Ports> writer (ports);
574 boost::shared_ptr<Ports> ps = writer.get_copy ();
576 newport = new Port (p);
577 ps->insert (ps->begin(), newport);
579 /* writer goes out of scope, forces update */
585 port_registration_failure (portname);
593 AudioEngine::unregister_port (Port *port)
596 /* probably happening when the engine has been halted by JACK,
597 in which case, there is nothing we can do here.
604 int ret = jack_port_unregister (_jack, port->_port);
610 RCUWriter<Ports> writer (ports);
611 boost::shared_ptr<Ports> ps = writer.get_copy ();
613 for (Ports::iterator i = ps->begin(); i != ps->end(); ++i) {
620 /* writer goes out of scope, forces update */
623 remove_connections_for (port);
634 AudioEngine::connect (const string& source, const string& destination)
638 fatal << _("connect called before engine was started") << endmsg;
645 string s = make_port_name_non_relative (source);
646 string d = make_port_name_non_relative (destination);
648 int ret = jack_connect (_jack, s.c_str(), d.c_str());
651 pair<string,string> c (s, d);
652 port_connections.push_back (c);
653 } else if (ret == EEXIST) {
654 error << string_compose(_("AudioEngine: connection already exists: %1 (%2) to %3 (%4)"),
655 source, s, destination, d)
658 error << string_compose(_("AudioEngine: cannot connect %1 (%2) to %3 (%4)"),
659 source, s, destination, d)
667 AudioEngine::disconnect (const string& source, const string& destination)
671 fatal << _("disconnect called before engine was started") << endmsg;
678 string s = make_port_name_non_relative (source);
679 string d = make_port_name_non_relative (destination);
681 int ret = jack_disconnect (_jack, s.c_str(), d.c_str());
684 pair<string,string> c (s, d);
685 PortConnections::iterator i;
687 if ((i = find (port_connections.begin(), port_connections.end(), c)) != port_connections.end()) {
688 port_connections.erase (i);
696 AudioEngine::disconnect (Port *port)
700 fatal << _("disconnect called before engine was started") << endmsg;
707 int ret = jack_port_disconnect (_jack, port->_port);
710 remove_connections_for (port);
718 AudioEngine::frame_rate ()
721 if (_frame_rate == 0) {
722 return (_frame_rate = jack_get_sample_rate (_jack));
727 fatal << X_("programming error: AudioEngine::frame_rate() called while disconnected from JACK")
735 AudioEngine::frames_per_cycle ()
738 if (_buffer_size == 0) {
739 return (_buffer_size = jack_get_buffer_size (_jack));
744 fatal << X_("programming error: AudioEngine::frame_rate() called while disconnected from JACK")
752 AudioEngine::get_port_by_name (const string& portname, bool keep)
754 Glib::Mutex::Lock lm (_process_lock);
758 fatal << _("get_port_by_name() called before engine was started") << endmsg;
765 /* check to see if we have a Port for this name already */
767 boost::shared_ptr<Ports> pr = ports.reader();
769 for (Ports::iterator i = pr->begin(); i != pr->end(); ++i) {
770 if (portname == (*i)->name()) {
777 if ((p = jack_port_by_name (_jack, portname.c_str())) != 0) {
778 Port *newport = new Port (p);
781 if (keep && newport->is_mine (_jack)) {
782 RCUWriter<Ports> writer (ports);
783 boost::shared_ptr<Ports> ps = writer.get_copy ();
784 ps->insert (newport);
785 /* writer goes out of scope, forces update */
798 AudioEngine::get_ports (const string& port_name_pattern, const string& type_name_pattern, uint32_t flags)
802 fatal << _("get_ports called before engine was started") << endmsg;
808 return jack_get_ports (_jack, port_name_pattern.c_str(), type_name_pattern.c_str(), flags);
812 AudioEngine::halted (void *arg)
814 AudioEngine* ae = static_cast<AudioEngine *> (arg);
815 bool was_running = ae->_running;
817 ae->stop_metering_thread ();
819 ae->_running = false;
820 ae->_buffer_size = 0;
824 ae->Halted(); /* EMIT SIGNAL */
829 AudioEngine::can_request_hardware_monitoring ()
837 if ((ports = jack_get_ports (_jack, NULL, JACK_DEFAULT_AUDIO_TYPE, JackPortCanMonitor)) == 0) {
848 AudioEngine::n_physical_audio_outputs () const
857 if ((ports = jack_get_ports (_jack, NULL, JACK_DEFAULT_AUDIO_TYPE, JackPortIsPhysical|JackPortIsInput)) == 0) {
861 for (i = 0; ports[i]; ++i);
868 AudioEngine::n_physical_audio_inputs () const
877 if ((ports = jack_get_ports (_jack, NULL, JACK_DEFAULT_AUDIO_TYPE, JackPortIsPhysical|JackPortIsOutput)) == 0) {
882 for (i = 0; ports[i]; ++i);
889 AudioEngine::get_physical_audio_inputs (vector<string>& ins)
898 if ((ports = jack_get_ports (_jack, NULL, JACK_DEFAULT_AUDIO_TYPE, JackPortIsPhysical|JackPortIsOutput)) == 0) {
903 for (i = 0; ports[i]; ++i) {
904 ins.push_back (ports[i]);
911 AudioEngine::get_physical_audio_outputs (vector<string>& outs)
920 if ((ports = jack_get_ports (_jack, NULL, JACK_DEFAULT_AUDIO_TYPE, JackPortIsPhysical|JackPortIsInput)) == 0) {
925 for (i = 0; ports[i]; ++i) {
926 outs.push_back (ports[i]);
933 AudioEngine::get_nth_physical_audio (uint32_t n, int flag)
940 fatal << _("get_nth_physical called before engine was connected") << endmsg;
944 ports = jack_get_ports (_jack, NULL, JACK_DEFAULT_AUDIO_TYPE, JackPortIsPhysical|flag);
950 for (i = 0; i < n && ports[i]; ++i);
956 free ((char *) ports);
962 AudioEngine::get_port_total_latency (const Port& port)
965 fatal << _("get_port_total_latency() called with no JACK client connection") << endmsg;
969 return jack_port_get_total_latency (_jack, port._port);
973 AudioEngine::transport_stop ()
976 jack_transport_stop (_jack);
981 AudioEngine::transport_start ()
984 jack_transport_start (_jack);
989 AudioEngine::transport_locate (nframes_t where)
991 // cerr << "tell JACK to locate to " << where << endl;
993 jack_transport_locate (_jack, where);
997 AudioEngine::TransportState
998 AudioEngine::transport_state ()
1001 jack_position_t pos;
1002 return (TransportState) jack_transport_query (_jack, &pos);
1004 return (TransportState) JackTransportStopped;
1009 AudioEngine::reset_timebase ()
1012 if (Config->get_jack_time_master()) {
1013 return jack_set_timebase_callback (_jack, 0, _jack_timebase_callback, this);
1015 return jack_release_timebase (_jack);
1023 AudioEngine::freewheel (bool onoff)
1027 if (onoff != _freewheeling) {
1030 _freewheel_thread_registered = false;
1033 return jack_set_freewheel (_jack, onoff);
1036 /* already doing what has been asked for */
1046 AudioEngine::remove_all_ports ()
1048 /* process lock MUST be held */
1051 boost::shared_ptr<Ports> p = ports.reader();
1053 for (Ports::iterator i = p->begin(); i != p->end(); ++i) {
1054 jack_port_unregister (_jack, (*i)->_port);
1059 RCUWriter<Ports> writer (ports);
1060 boost::shared_ptr<Ports> ps = writer.get_copy ();
1064 port_connections.clear ();
1068 AudioEngine::remove_connections_for (Port* port)
1070 for (PortConnections::iterator i = port_connections.begin(); i != port_connections.end(); ) {
1071 PortConnections::iterator tmp;
1076 if ((*i).first == port->name()) {
1077 port_connections.erase (i);
1084 #ifdef HAVE_JACK_CLIENT_OPEN
1087 AudioEngine::connect_to_jack (string client_name)
1089 jack_options_t options = JackNullOption;
1090 jack_status_t status;
1091 const char *server_name = NULL;
1093 jack_client_name = client_name; /* might be reset below */
1094 _jack = jack_client_open (jack_client_name.c_str(), options, &status, server_name);
1096 if (_jack == NULL) {
1097 /* just return without an error message. something else will take care of it */
1101 if (status & JackNameNotUnique) {
1102 jack_client_name = jack_get_client_name (_jack);
1105 jack_set_error_function (ardour_jack_error);
1113 AudioEngine::connect_to_jack (string client_name)
1115 jack_client_name = client_name;
1117 if ((_jack = jack_client_new (client_name.c_str())) == 0) {
1124 #endif /* HAVE_JACK_CLIENT_OPEN */
1127 AudioEngine::disconnect_from_jack ()
1135 stop_metering_thread ();
1139 Glib::Mutex::Lock lm (_process_lock);
1140 jack_client_close (_jack);
1149 Stopped(); /* EMIT SIGNAL */
1156 AudioEngine::reconnect_to_jack ()
1159 disconnect_from_jack ();
1160 /* XXX give jackd a chance */
1161 Glib::usleep (250000);
1164 if (connect_to_jack (jack_client_name)) {
1165 error << _("failed to connect to JACK") << endmsg;
1171 boost::shared_ptr<Ports> p = ports.reader ();
1173 for (i = p->begin(); i != p->end(); ++i) {
1175 /* XXX hack hack hack */
1177 string long_name = (*i)->name();
1180 short_name = long_name.substr (long_name.find_last_of (':') + 1);
1182 if (((*i)->_port = jack_port_register (_jack, short_name.c_str(), (*i)->type(), (*i)->flags(), 0)) == 0) {
1183 error << string_compose (_("could not reregister %1"), (*i)->name()) << endmsg;
1190 if ((*i)->flags() & JackPortIsOutput) {
1191 (*i)->silence (jack_get_buffer_size (_jack));
1195 if (i != p->end()) {
1197 for (Ports::iterator i = p->begin(); i != p->end(); ++i) {
1198 jack_port_unregister (_jack, (*i)->_port);
1205 session->reset_jack_connection (_jack);
1206 nframes_t blocksize = jack_get_buffer_size (_jack);
1207 Port::set_buffer_size (blocksize);
1208 session->set_block_size (blocksize);
1209 session->set_frame_rate (jack_get_sample_rate (_jack));
1212 last_monitor_check = 0;
1214 jack_on_shutdown (_jack, halted, this);
1215 jack_set_graph_order_callback (_jack, _graph_order_callback, this);
1216 jack_set_thread_init_callback (_jack, _thread_init_callback, this);
1217 jack_set_process_callback (_jack, _process_callback, this);
1218 jack_set_sample_rate_callback (_jack, _sample_rate_callback, this);
1219 jack_set_buffer_size_callback (_jack, _bufsize_callback, this);
1220 jack_set_xrun_callback (_jack, _xrun_callback, this);
1221 jack_set_sync_callback (_jack, _jack_sync_callback, this);
1222 jack_set_freewheel_callback (_jack, _freewheel_callback, this);
1224 if (Config->get_jack_time_master()) {
1225 jack_set_timebase_callback (_jack, 0, _jack_timebase_callback, this);
1228 if (jack_activate (_jack) == 0) {
1235 /* re-establish connections */
1237 for (PortConnections::iterator i = port_connections.begin(); i != port_connections.end(); ++i) {
1240 jack_client_t* j = _jack;
1242 /* JACK could have zombified us. */
1245 error << _("Disconnected from JACK while reconnecting. You should quit Ardour now.") << endmsg;
1249 if ((err = jack_connect (j, (*i).first.c_str(), (*i).second.c_str())) != 0) {
1250 if (err != EEXIST) {
1251 error << string_compose (_("could not reconnect %1 and %2 (err = %3)"),
1252 (*i).first, (*i).second, err)
1258 Running (); /* EMIT SIGNAL*/
1260 start_metering_thread ();
1266 AudioEngine::request_buffer_size (nframes_t nframes)
1270 if (nframes == jack_get_buffer_size (_jack)) {
1274 return jack_set_buffer_size (_jack, nframes);
1282 AudioEngine::update_total_latencies ()
1284 #ifdef HAVE_JACK_RECOMPUTE_LATENCIES
1286 jack_recompute_total_latencies (_jack);
1292 AudioEngine::make_port_name_relative (string portname)
1294 string::size_type len;
1295 string::size_type n;
1297 len = portname.length();
1299 for (n = 0; n < len; ++n) {
1300 if (portname[n] == ':') {
1305 if ((n != len) && (portname.substr (0, n) == jack_client_name)) {
1306 return portname.substr (n+1);
1313 AudioEngine::make_port_name_non_relative (string portname)
1317 if (portname.find_first_of (':') != string::npos) {
1321 str = jack_client_name;
1329 AudioEngine::is_realtime () const
1332 return jack_is_realtime (_jack);