2 * Copyright (C) 2014 Robin Gareus <robin@gareus.org>
3 * Copyright (C) 2013 Paul Davis
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include "alsa_audiobackend.h"
27 #include "rt_thread.h"
29 #include "pbd/error.h"
30 #include "ardour/port_manager.h"
33 using namespace ARDOUR;
35 static std::string s_instance_name;
36 size_t AlsaAudioBackend::_max_buffer_size = 8192;
38 AlsaAudioBackend::AlsaAudioBackend (AudioEngine& e, AudioBackendInfo& info)
39 : AudioBackend (e, info)
42 , _freewheeling (false)
44 , _playback_device("")
46 , _samples_per_period (1024)
47 , _periods_per_cycle (2)
53 , _systemic_input_latency (0)
54 , _systemic_output_latency (0)
55 , _processed_samples (0)
57 _instance_name = s_instance_name;
58 pthread_mutex_init (&_port_callback_mutex, 0);
61 AlsaAudioBackend::~AlsaAudioBackend ()
63 pthread_mutex_destroy (&_port_callback_mutex);
66 /* AUDIOBACKEND API */
69 AlsaAudioBackend::name () const
75 AlsaAudioBackend::is_realtime () const
80 std::vector<AudioBackend::DeviceStatus>
81 AlsaAudioBackend::enumerate_devices () const
83 std::vector<AudioBackend::DeviceStatus> s;
85 snd_ctl_card_info_t *info;
86 snd_ctl_card_info_alloca (&info);
88 // TODO re-use code from libs/backends/jack/jack_utils.cc
89 while (snd_card_next (&cardnum) >= 0 && cardnum >= 0) {
92 std::string devname = "hw:";
93 devname += PBD::to_string (cardnum, std::dec);
95 if (snd_ctl_open (&handle, devname.c_str(), 0) >= 0 && snd_ctl_card_info (handle, info) >= 0) {
96 //string card_name = snd_ctl_card_info_get_name (info);
98 if (snd_ctl_pcm_next_device (handle, &device) >= 0 && device >= 0) {
99 s.push_back (DeviceStatus (devname, true));
101 snd_ctl_close(handle);
108 AlsaAudioBackend::available_sample_rates (const std::string&) const
110 std::vector<float> sr;
111 sr.push_back (8000.0);
112 sr.push_back (22050.0);
113 sr.push_back (24000.0);
114 sr.push_back (44100.0);
115 sr.push_back (48000.0);
116 sr.push_back (88200.0);
117 sr.push_back (96000.0);
118 sr.push_back (176400.0);
119 sr.push_back (192000.0);
123 std::vector<uint32_t>
124 AlsaAudioBackend::available_buffer_sizes (const std::string&) const
126 std::vector<uint32_t> bs;
140 AlsaAudioBackend::available_input_channel_count (const std::string&) const
142 return 128; // TODO query current device
146 AlsaAudioBackend::available_output_channel_count (const std::string&) const
148 return 128; // TODO query current device
152 AlsaAudioBackend::can_change_sample_rate_when_running () const
158 AlsaAudioBackend::can_change_buffer_size_when_running () const
164 AlsaAudioBackend::set_device_name (const std::string& d)
167 _playback_device = d;
172 AlsaAudioBackend::set_sample_rate (float sr)
174 if (sr <= 0) { return -1; }
176 engine.sample_rate_change (sr);
181 AlsaAudioBackend::set_buffer_size (uint32_t bs)
183 if (bs <= 0 || bs >= _max_buffer_size) {
186 _samples_per_period = bs;
187 engine.buffer_size_change (bs);
192 AlsaAudioBackend::set_interleaved (bool yn)
194 if (!yn) { return 0; }
199 AlsaAudioBackend::set_input_channels (uint32_t cc)
206 AlsaAudioBackend::set_output_channels (uint32_t cc)
213 AlsaAudioBackend::set_systemic_input_latency (uint32_t sl)
215 _systemic_input_latency = sl;
220 AlsaAudioBackend::set_systemic_output_latency (uint32_t sl)
222 _systemic_output_latency = sl;
226 /* Retrieving parameters */
228 AlsaAudioBackend::device_name () const
230 return _capture_device;
234 AlsaAudioBackend::sample_rate () const
240 AlsaAudioBackend::buffer_size () const
242 return _samples_per_period;
246 AlsaAudioBackend::interleaved () const
252 AlsaAudioBackend::input_channels () const
258 AlsaAudioBackend::output_channels () const
264 AlsaAudioBackend::systemic_input_latency () const
266 return _systemic_input_latency;
270 AlsaAudioBackend::systemic_output_latency () const
272 return _systemic_output_latency;
276 std::vector<std::string>
277 AlsaAudioBackend::enumerate_midi_options () const
279 std::vector<std::string> m;
280 m.push_back (_("-None-"));
285 AlsaAudioBackend::set_midi_option (const std::string& /* opt*/)
291 AlsaAudioBackend::midi_option () const
298 static void * pthread_process (void *arg)
300 AlsaAudioBackend *d = static_cast<AlsaAudioBackend *>(arg);
301 d->main_process_thread ();
307 AlsaAudioBackend::_start (bool for_latency_measurement)
310 PBD::error << _("AlsaAudioBackend: already active.") << endmsg;
315 PBD::warning << _("AlsaAudioBackend: recovering from unclean shutdown, port registry is not empty.") << endmsg;
316 _system_inputs.clear();
317 _system_outputs.clear();
323 _pcmi = new Alsa_pcmi (_capture_device.c_str(), _playback_device.c_str(), 0, _samplerate, _samples_per_period, _periods_per_cycle, 0);
324 if (_pcmi->state ()) {
325 PBD::error << _("AlsaAudioBackend: failed to open device (see stderr for details).") << endmsg;
326 delete _pcmi; _pcmi = 0;
334 if (_n_outputs != _pcmi->nplay ()) {
335 if (_n_outputs == 0) {
336 _n_outputs = _pcmi->nplay ();
338 _n_outputs = std::min (_n_outputs, _pcmi->nplay ());
340 PBD::warning << _("AlsaAudioBackend: adjusted output channel count to match device.") << endmsg;
343 if (_n_inputs != _pcmi->ncapt ()) {
344 if (_n_inputs == 0) {
345 _n_inputs = _pcmi->ncapt ();
347 _n_inputs = std::min (_n_inputs, _pcmi->ncapt ());
349 PBD::warning << _("AlsaAudioBackend: adjusted input channel count to match device.") << endmsg;
352 if (_pcmi->fsize() != _samples_per_period) {
353 _samples_per_period = _pcmi->fsize();
354 PBD::warning << _("AlsaAudioBackend: samples per period does not match.") << endmsg;
357 if (_pcmi->fsamp() != _samplerate) {
358 _samplerate = _pcmi->fsamp();
359 engine.sample_rate_change (_samplerate);
360 PBD::warning << _("AlsaAudioBackend: sample rate does not match.") << endmsg;
363 if (for_latency_measurement) {
364 _systemic_input_latency = 0;
365 _systemic_output_latency = 0;
368 if (register_system_ports()) {
369 PBD::error << _("AlsaAudioBackend: failed to register system ports.") << endmsg;
370 delete _pcmi; _pcmi = 0;
374 if (engine.reestablish_ports ()) {
375 PBD::error << _("AlsaAudioBackend: Could not re-establish ports.") << endmsg;
376 delete _pcmi; _pcmi = 0;
380 engine.buffer_size_change (_samples_per_period);
381 engine.reconnect_ports ();
383 if (_realtime_pthread_create (SCHED_FIFO, -20,
384 &_main_thread, pthread_process, this))
386 if (pthread_create (&_main_thread, NULL, pthread_process, this))
388 PBD::error << _("AlsaAudioBackend: failed to create process thread.") << endmsg;
389 delete _pcmi; _pcmi = 0;
392 PBD::warning << _("AlsaAudioBackend: cannot acquire realtime permissions.") << endmsg;
397 while (!_running && --timeout > 0) { Glib::usleep (1000); }
399 if (timeout == 0 || !_running) {
400 PBD::error << _("AlsaAudioBackend: failed to start process thread.") << endmsg;
401 delete _pcmi; _pcmi = 0;
409 AlsaAudioBackend::stop ()
417 if (pthread_join (_main_thread, &status)) {
418 PBD::error << _("AlsaAudioBackend: failed to terminate.") << endmsg;
421 unregister_system_ports();
422 delete _pcmi; _pcmi = 0;
427 AlsaAudioBackend::freewheel (bool onoff)
429 if (onoff == _freewheeling) {
432 _freewheeling = onoff;
433 engine.freewheel_callback (onoff);
438 AlsaAudioBackend::dsp_load () const
440 return 100.f * _dsp_load;
444 AlsaAudioBackend::raw_buffer_size (DataType t)
447 case DataType::AUDIO:
448 return _samples_per_period * sizeof(Sample);
450 return _max_buffer_size; // XXX not really limited
457 AlsaAudioBackend::sample_time ()
459 return _processed_samples;
463 AlsaAudioBackend::sample_time_at_cycle_start ()
465 return _processed_samples;
469 AlsaAudioBackend::samples_since_cycle_start ()
476 AlsaAudioBackend::alsa_process_thread (void *arg)
478 ThreadData* td = reinterpret_cast<ThreadData*> (arg);
479 boost::function<void ()> f = td->f;
486 AlsaAudioBackend::create_process_thread (boost::function<void()> func)
490 size_t stacksize = 100000;
492 pthread_attr_init (&attr);
493 pthread_attr_setstacksize (&attr, stacksize);
494 ThreadData* td = new ThreadData (this, func, stacksize);
496 if (pthread_create (&thread_id, &attr, alsa_process_thread, td)) {
497 PBD::error << _("AudioEngine: cannot create process thread.") << endmsg;
498 pthread_attr_destroy (&attr);
501 pthread_attr_destroy (&attr);
503 _threads.push_back (thread_id);
508 AlsaAudioBackend::join_process_threads ()
512 for (std::vector<pthread_t>::const_iterator i = _threads.begin (); i != _threads.end (); ++i)
515 if (pthread_join (*i, &status)) {
516 PBD::error << _("AudioEngine: cannot terminate process thread.") << endmsg;
525 AlsaAudioBackend::in_process_thread ()
527 for (std::vector<pthread_t>::const_iterator i = _threads.begin (); i != _threads.end (); ++i)
529 if (pthread_equal (*i, pthread_self ()) != 0) {
537 AlsaAudioBackend::process_thread_count ()
539 return _threads.size ();
543 AlsaAudioBackend::update_latencies ()
550 AlsaAudioBackend::private_handle () const
556 AlsaAudioBackend::my_name () const
558 return _instance_name;
562 AlsaAudioBackend::available () const
568 AlsaAudioBackend::port_name_size () const
574 AlsaAudioBackend::set_port_name (PortEngine::PortHandle port, const std::string& name)
576 if (!valid_port (port)) {
577 PBD::error << _("AlsaBackend::set_port_name: Invalid Port(s)") << endmsg;
580 return static_cast<AlsaPort*>(port)->set_name (_instance_name + ":" + name);
584 AlsaAudioBackend::get_port_name (PortEngine::PortHandle port) const
586 if (!valid_port (port)) {
587 PBD::error << _("AlsaBackend::get_port_name: Invalid Port(s)") << endmsg;
588 return std::string ();
590 return static_cast<AlsaPort*>(port)->name ();
593 PortEngine::PortHandle
594 AlsaAudioBackend::get_port_by_name (const std::string& name) const
596 PortHandle port = (PortHandle) find_port (name);
601 AlsaAudioBackend::get_ports (
602 const std::string& port_name_pattern,
603 DataType type, PortFlags flags,
604 std::vector<std::string>& port_names) const
608 bool use_regexp = false;
609 if (port_name_pattern.size () > 0) {
610 if (!regcomp (&port_regex, port_name_pattern.c_str (), REG_EXTENDED|REG_NOSUB)) {
614 for (size_t i = 0; i < _ports.size (); ++i) {
615 AlsaPort* port = _ports[i];
616 if ((port->type () == type) && (port->flags () & flags)) {
617 if (!use_regexp || !regexec (&port_regex, port->name ().c_str (), 0, NULL, 0)) {
618 port_names.push_back (port->name ());
624 regfree (&port_regex);
630 AlsaAudioBackend::port_data_type (PortEngine::PortHandle port) const
632 if (!valid_port (port)) {
633 return DataType::NIL;
635 return static_cast<AlsaPort*>(port)->type ();
638 PortEngine::PortHandle
639 AlsaAudioBackend::register_port (
640 const std::string& name,
641 ARDOUR::DataType type,
642 ARDOUR::PortFlags flags)
644 if (name.size () == 0) { return 0; }
645 if (flags & IsPhysical) { return 0; }
646 return add_port (_instance_name + ":" + name, type, flags);
649 PortEngine::PortHandle
650 AlsaAudioBackend::add_port (
651 const std::string& name,
652 ARDOUR::DataType type,
653 ARDOUR::PortFlags flags)
655 assert(name.size ());
656 if (find_port (name)) {
657 PBD::error << _("AlsaBackend::register_port: Port already exists:")
658 << " (" << name << ")" << endmsg;
661 AlsaPort* port = NULL;
663 case DataType::AUDIO:
664 port = new AlsaAudioPort (*this, name, flags);
667 port = new AlsaMidiPort (*this, name, flags);
670 PBD::error << _("AlsaBackend::register_port: Invalid Data Type.") << endmsg;
674 _ports.push_back (port);
680 AlsaAudioBackend::unregister_port (PortEngine::PortHandle port_handle)
682 if (!valid_port (port_handle)) {
683 PBD::error << _("AlsaBackend::unregister_port: Invalid Port.") << endmsg;
685 AlsaPort* port = static_cast<AlsaPort*>(port_handle);
686 std::vector<AlsaPort*>::iterator i = std::find (_ports.begin (), _ports.end (), static_cast<AlsaPort*>(port_handle));
687 if (i == _ports.end ()) {
688 PBD::error << _("AlsaBackend::unregister_port: Failed to find port") << endmsg;
691 disconnect_all(port_handle);
697 AlsaAudioBackend::register_system_ports()
701 const int a_ins = _n_inputs > 0 ? _n_inputs : 2;
702 const int a_out = _n_outputs > 0 ? _n_outputs : 2;
703 const int m_ins = _n_midi_inputs > 0 ? _n_midi_inputs : 2;
704 const int m_out = _n_midi_outputs > 0 ? _n_midi_outputs : 2;
707 lr.min = lr.max = _samples_per_period * _periods_per_cycle + _systemic_input_latency;
708 for (int i = 1; i <= a_ins; ++i) {
710 snprintf(tmp, sizeof(tmp), "system:capture_%d", i);
711 PortHandle p = add_port(std::string(tmp), DataType::AUDIO, static_cast<PortFlags>(IsOutput | IsPhysical | IsTerminal));
713 set_latency_range (p, false, lr);
714 _system_inputs.push_back(static_cast<AlsaPort*>(p));
717 lr.min = lr.max = _samples_per_period * _periods_per_cycle + _systemic_output_latency;
718 for (int i = 1; i <= a_out; ++i) {
720 snprintf(tmp, sizeof(tmp), "system:playback_%d", i);
721 PortHandle p = add_port(std::string(tmp), DataType::AUDIO, static_cast<PortFlags>(IsInput | IsPhysical | IsTerminal));
723 set_latency_range (p, false, lr);
724 _system_outputs.push_back(static_cast<AlsaPort*>(p));
728 lr.min = lr.max = _samples_per_period + _systemic_input_latency;
729 for (int i = 1; i <= m_ins; ++i) {
731 snprintf(tmp, sizeof(tmp), "system:midi_capture_%d", i);
732 PortHandle p = add_port(std::string(tmp), DataType::MIDI, static_cast<PortFlags>(IsOutput | IsPhysical | IsTerminal));
734 set_latency_range (p, false, lr);
737 lr.min = lr.max = _samples_per_period + _systemic_output_latency;
738 for (int i = 1; i <= m_out; ++i) {
740 snprintf(tmp, sizeof(tmp), "system:midi_playback_%d", i);
741 PortHandle p = add_port(std::string(tmp), DataType::MIDI, static_cast<PortFlags>(IsInput | IsPhysical | IsTerminal));
743 set_latency_range (p, false, lr);
750 AlsaAudioBackend::unregister_system_ports()
753 _system_inputs.clear();
754 _system_outputs.clear();
755 while (i < _ports.size ()) {
756 AlsaPort* port = _ports[i];
757 if (port->is_physical () && port->is_terminal ()) {
758 port->disconnect_all ();
759 _ports.erase (_ports.begin() + i);
767 AlsaAudioBackend::connect (const std::string& src, const std::string& dst)
769 AlsaPort* src_port = find_port (src);
770 AlsaPort* dst_port = find_port (dst);
773 PBD::error << _("AlsaBackend::connect: Invalid Source port:")
774 << " (" << src <<")" << endmsg;
778 PBD::error << _("AlsaBackend::connect: Invalid Destination port:")
779 << " (" << dst <<")" << endmsg;
782 return src_port->connect (dst_port);
786 AlsaAudioBackend::disconnect (const std::string& src, const std::string& dst)
788 AlsaPort* src_port = find_port (src);
789 AlsaPort* dst_port = find_port (dst);
791 if (!src_port || !dst_port) {
792 PBD::error << _("AlsaBackend::disconnect: Invalid Port(s)") << endmsg;
795 return src_port->disconnect (dst_port);
799 AlsaAudioBackend::connect (PortEngine::PortHandle src, const std::string& dst)
801 AlsaPort* dst_port = find_port (dst);
802 if (!valid_port (src)) {
803 PBD::error << _("AlsaBackend::connect: Invalid Source Port Handle") << endmsg;
807 PBD::error << _("AlsaBackend::connect: Invalid Destination Port")
808 << " (" << dst << ")" << endmsg;
811 return static_cast<AlsaPort*>(src)->connect (dst_port);
815 AlsaAudioBackend::disconnect (PortEngine::PortHandle src, const std::string& dst)
817 AlsaPort* dst_port = find_port (dst);
818 if (!valid_port (src) || !dst_port) {
819 PBD::error << _("AlsaBackend::disconnect: Invalid Port(s)") << endmsg;
822 return static_cast<AlsaPort*>(src)->disconnect (dst_port);
826 AlsaAudioBackend::disconnect_all (PortEngine::PortHandle port)
828 if (!valid_port (port)) {
829 PBD::error << _("AlsaBackend::disconnect_all: Invalid Port") << endmsg;
832 static_cast<AlsaPort*>(port)->disconnect_all ();
837 AlsaAudioBackend::connected (PortEngine::PortHandle port, bool /* process_callback_safe*/)
839 if (!valid_port (port)) {
840 PBD::error << _("AlsaBackend::disconnect_all: Invalid Port") << endmsg;
843 return static_cast<AlsaPort*>(port)->is_connected ();
847 AlsaAudioBackend::connected_to (PortEngine::PortHandle src, const std::string& dst, bool /*process_callback_safe*/)
849 AlsaPort* dst_port = find_port (dst);
850 if (!valid_port (src) || !dst_port) {
851 PBD::error << _("AlsaBackend::connected_to: Invalid Port") << endmsg;
854 return static_cast<AlsaPort*>(src)->is_connected (dst_port);
858 AlsaAudioBackend::physically_connected (PortEngine::PortHandle port, bool /*process_callback_safe*/)
860 if (!valid_port (port)) {
861 PBD::error << _("AlsaBackend::physically_connected: Invalid Port") << endmsg;
864 return static_cast<AlsaPort*>(port)->is_physically_connected ();
868 AlsaAudioBackend::get_connections (PortEngine::PortHandle port, std::vector<std::string>& names, bool /*process_callback_safe*/)
870 if (!valid_port (port)) {
871 PBD::error << _("AlsaBackend::get_connections: Invalid Port") << endmsg;
875 assert (0 == names.size ());
877 const std::vector<AlsaPort*>& connected_ports = static_cast<AlsaPort*>(port)->get_connections ();
879 for (std::vector<AlsaPort*>::const_iterator i = connected_ports.begin (); i != connected_ports.end (); ++i) {
880 names.push_back ((*i)->name ());
883 return (int)names.size ();
888 AlsaAudioBackend::midi_event_get (
889 pframes_t& timestamp,
890 size_t& size, uint8_t** buf, void* port_buffer,
891 uint32_t event_index)
893 assert (buf && port_buffer);
894 AlsaMidiBuffer& source = * static_cast<AlsaMidiBuffer*>(port_buffer);
895 if (event_index >= source.size ()) {
898 AlsaMidiEvent * const event = source[event_index].get ();
900 timestamp = event->timestamp ();
901 size = event->size ();
902 *buf = event->data ();
907 AlsaAudioBackend::midi_event_put (
910 const uint8_t* buffer, size_t size)
912 assert (buffer && port_buffer);
913 AlsaMidiBuffer& dst = * static_cast<AlsaMidiBuffer*>(port_buffer);
914 if (dst.size () && (pframes_t)dst.back ()->timestamp () > timestamp) {
915 fprintf (stderr, "AlsaMidiBuffer: it's too late for this event. %d > %d\n",
916 (pframes_t)dst.back ()->timestamp (), timestamp);
919 dst.push_back (boost::shared_ptr<AlsaMidiEvent>(new AlsaMidiEvent (timestamp, buffer, size)));
924 AlsaAudioBackend::get_midi_event_count (void* port_buffer)
926 assert (port_buffer);
927 return static_cast<AlsaMidiBuffer*>(port_buffer)->size ();
931 AlsaAudioBackend::midi_clear (void* port_buffer)
933 assert (port_buffer);
934 AlsaMidiBuffer * buf = static_cast<AlsaMidiBuffer*>(port_buffer);
942 AlsaAudioBackend::can_monitor_input () const
948 AlsaAudioBackend::request_input_monitoring (PortEngine::PortHandle, bool)
954 AlsaAudioBackend::ensure_input_monitoring (PortEngine::PortHandle, bool)
960 AlsaAudioBackend::monitoring_input (PortEngine::PortHandle)
965 /* Latency management */
968 AlsaAudioBackend::set_latency_range (PortEngine::PortHandle port, bool for_playback, LatencyRange latency_range)
970 if (!valid_port (port)) {
971 PBD::error << _("AlsaPort::set_latency_range (): invalid port.") << endmsg;
973 static_cast<AlsaPort*>(port)->set_latency_range (latency_range, for_playback);
977 AlsaAudioBackend::get_latency_range (PortEngine::PortHandle port, bool for_playback)
979 if (!valid_port (port)) {
980 PBD::error << _("AlsaPort::get_latency_range (): invalid port.") << endmsg;
986 return static_cast<AlsaPort*>(port)->latency_range (for_playback);
989 /* Discovering physical ports */
992 AlsaAudioBackend::port_is_physical (PortEngine::PortHandle port) const
994 if (!valid_port (port)) {
995 PBD::error << _("AlsaPort::port_is_physical (): invalid port.") << endmsg;
998 return static_cast<AlsaPort*>(port)->is_physical ();
1002 AlsaAudioBackend::get_physical_outputs (DataType type, std::vector<std::string>& port_names)
1004 for (size_t i = 0; i < _ports.size (); ++i) {
1005 AlsaPort* port = _ports[i];
1006 if ((port->type () == type) && port->is_input () && port->is_physical ()) {
1007 port_names.push_back (port->name ());
1013 AlsaAudioBackend::get_physical_inputs (DataType type, std::vector<std::string>& port_names)
1015 for (size_t i = 0; i < _ports.size (); ++i) {
1016 AlsaPort* port = _ports[i];
1017 if ((port->type () == type) && port->is_output () && port->is_physical ()) {
1018 port_names.push_back (port->name ());
1024 AlsaAudioBackend::n_physical_outputs () const
1028 for (size_t i = 0; i < _ports.size (); ++i) {
1029 AlsaPort* port = _ports[i];
1030 if (port->is_output () && port->is_physical ()) {
1031 switch (port->type ()) {
1032 case DataType::AUDIO: ++n_audio; break;
1033 case DataType::MIDI: ++n_midi; break;
1039 cc.set (DataType::AUDIO, n_audio);
1040 cc.set (DataType::MIDI, n_midi);
1045 AlsaAudioBackend::n_physical_inputs () const
1049 for (size_t i = 0; i < _ports.size (); ++i) {
1050 AlsaPort* port = _ports[i];
1051 if (port->is_input () && port->is_physical ()) {
1052 switch (port->type ()) {
1053 case DataType::AUDIO: ++n_audio; break;
1054 case DataType::MIDI: ++n_midi; break;
1060 cc.set (DataType::AUDIO, n_audio);
1061 cc.set (DataType::MIDI, n_midi);
1065 /* Getting access to the data buffer for a port */
1068 AlsaAudioBackend::get_buffer (PortEngine::PortHandle port, pframes_t nframes)
1071 assert (valid_port (port));
1072 return static_cast<AlsaPort*>(port)->get_buffer (nframes);
1075 /* Engine Process */
1077 AlsaAudioBackend::main_process_thread ()
1079 AudioEngine::thread_init_callback (this);
1081 _processed_samples = 0;
1083 uint64_t clock1, clock2;
1084 clock1 = g_get_monotonic_time();
1085 _pcmi->pcm_start ();
1086 int no_proc_errors = 0;
1091 if (!_freewheeling) {
1092 nr = _pcmi->pcm_wait ();
1094 if (_pcmi->state () > 0) {
1098 if (_pcmi->state () < 0 || no_proc_errors > 50) {
1099 PBD::error << _("AlsaAudioBackend: I/O error. Audio Process Terminated.") << endmsg;
1102 while (nr >= (long)_samples_per_period) {
1104 clock1 = g_get_monotonic_time();
1107 _pcmi->capt_init (_samples_per_period);
1108 for (std::vector<AlsaPort*>::const_iterator it = _system_inputs.begin (); it != _system_inputs.end (); ++it, ++i) {
1109 _pcmi->capt_chan (i, (float*)((*it)->get_buffer(_samples_per_period)), _samples_per_period);
1111 _pcmi->capt_done (_samples_per_period);
1113 for (std::vector<AlsaPort*>::const_iterator it = _system_outputs.begin (); it != _system_outputs.end (); ++it) {
1114 memset ((*it)->get_buffer (_samples_per_period), 0, _samples_per_period * sizeof (Sample));
1117 if (engine.process_callback (_samples_per_period)) {
1122 /* write back audio */
1124 _pcmi->play_init (_samples_per_period);
1125 for (std::vector<AlsaPort*>::const_iterator it = _system_outputs.begin (); it != _system_outputs.end (); ++it, ++i) {
1126 _pcmi->play_chan (i, (const float*)(*it)->get_buffer (_samples_per_period), _samples_per_period);
1128 for (; i < _pcmi->nplay (); ++i) {
1129 _pcmi->clear_chan (i, _samples_per_period);
1131 _pcmi->play_done (_samples_per_period);
1132 nr -= _samples_per_period;
1133 _processed_samples += _samples_per_period;
1135 /* calculate DSP load */
1136 clock2 = g_get_monotonic_time();
1137 const int64_t elapsed_time = clock2 - clock1;
1138 const int64_t nomial_time = 1e6 * _samples_per_period / _samplerate;
1139 _dsp_load = elapsed_time / (float) nomial_time;
1142 if (xrun && (_pcmi->capt_xrun() > 0 || _pcmi->play_xrun() > 0)) {
1145 fprintf(stderr, "ALSA x-run read: %.1f ms, write: %.1f ms\n",
1146 _pcmi->capt_xrun() * 1000.0, _pcmi->play_xrun() * 1000.0);
1151 for (std::vector<AlsaPort*>::const_iterator it = _system_inputs.begin (); it != _system_inputs.end (); ++it) {
1152 memset ((*it)->get_buffer (_samples_per_period), 0, _samples_per_period * sizeof (Sample));
1154 if (engine.process_callback (_samples_per_period)) {
1159 Glib::usleep (100); // don't hog cpu
1162 if (!pthread_mutex_trylock (&_port_callback_mutex)) {
1163 while (!_port_connection_queue.empty ()) {
1164 PortConnectData *c = _port_connection_queue.back ();
1165 manager.connect_callback (c->a, c->b, c->c);
1166 _port_connection_queue.pop_back ();
1169 pthread_mutex_unlock (&_port_callback_mutex);
1178 /******************************************************************************/
1180 static boost::shared_ptr<AlsaAudioBackend> _instance;
1182 static boost::shared_ptr<AudioBackend> backend_factory (AudioEngine& e);
1183 static int instantiate (const std::string& arg1, const std::string& /* arg2 */);
1184 static int deinstantiate ();
1185 static bool already_configured ();
1187 static ARDOUR::AudioBackendInfo _descriptor = {
1195 static boost::shared_ptr<AudioBackend>
1196 backend_factory (AudioEngine& e)
1199 _instance.reset (new AlsaAudioBackend (e, _descriptor));
1205 instantiate (const std::string& arg1, const std::string& /* arg2 */)
1207 s_instance_name = arg1;
1219 already_configured ()
1224 extern "C" ARDOURBACKEND_API ARDOUR::AudioBackendInfo* descriptor ()
1226 return &_descriptor;
1230 /******************************************************************************/
1231 AlsaPort::AlsaPort (AlsaAudioBackend &b, const std::string& name, PortFlags flags)
1236 _capture_latency_range.min = 0;
1237 _capture_latency_range.max = 0;
1238 _playback_latency_range.min = 0;
1239 _playback_latency_range.max = 0;
1242 AlsaPort::~AlsaPort () {
1247 int AlsaPort::connect (AlsaPort *port)
1250 PBD::error << _("AlsaPort::connect (): invalid (null) port") << endmsg;
1254 if (type () != port->type ()) {
1255 PBD::error << _("AlsaPort::connect (): wrong port-type") << endmsg;
1259 if (is_output () && port->is_output ()) {
1260 PBD::error << _("AlsaPort::connect (): cannot inter-connect output ports.") << endmsg;
1264 if (is_input () && port->is_input ()) {
1265 PBD::error << _("AlsaPort::connect (): cannot inter-connect input ports.") << endmsg;
1270 PBD::error << _("AlsaPort::connect (): cannot self-connect ports.") << endmsg;
1274 if (is_connected (port)) {
1275 #if 0 // don't bother to warn about this for now. just ignore it
1276 PBD::error << _("AlsaPort::connect (): ports are already connected:")
1277 << " (" << name () << ") -> (" << port->name () << ")"
1283 _connect (port, true);
1288 void AlsaPort::_connect (AlsaPort *port, bool callback)
1290 _connections.push_back (port);
1292 port->_connect (this, false);
1293 _alsa_backend.port_connect_callback (name(), port->name(), true);
1297 int AlsaPort::disconnect (AlsaPort *port)
1300 PBD::error << _("AlsaPort::disconnect (): invalid (null) port") << endmsg;
1304 if (!is_connected (port)) {
1305 PBD::error << _("AlsaPort::disconnect (): ports are not connected:")
1306 << " (" << name () << ") -> (" << port->name () << ")"
1310 _disconnect (port, true);
1314 void AlsaPort::_disconnect (AlsaPort *port, bool callback)
1316 std::vector<AlsaPort*>::iterator it = std::find (_connections.begin (), _connections.end (), port);
1318 assert (it != _connections.end ());
1320 _connections.erase (it);
1323 port->_disconnect (this, false);
1324 _alsa_backend.port_connect_callback (name(), port->name(), false);
1329 void AlsaPort::disconnect_all ()
1331 while (!_connections.empty ()) {
1332 _connections.back ()->_disconnect (this, false);
1333 _alsa_backend.port_connect_callback (name(), _connections.back ()->name(), false);
1334 _connections.pop_back ();
1339 AlsaPort::is_connected (const AlsaPort *port) const
1341 return std::find (_connections.begin (), _connections.end (), port) != _connections.end ();
1344 bool AlsaPort::is_physically_connected () const
1346 for (std::vector<AlsaPort*>::const_iterator it = _connections.begin (); it != _connections.end (); ++it) {
1347 if ((*it)->is_physical ()) {
1354 /******************************************************************************/
1356 AlsaAudioPort::AlsaAudioPort (AlsaAudioBackend &b, const std::string& name, PortFlags flags)
1357 : AlsaPort (b, name, flags)
1359 memset (_buffer, 0, sizeof (_buffer));
1360 mlock(_buffer, sizeof (_buffer));
1363 AlsaAudioPort::~AlsaAudioPort () { }
1365 void* AlsaAudioPort::get_buffer (pframes_t n_samples)
1368 std::vector<AlsaPort*>::const_iterator it = get_connections ().begin ();
1369 if (it == get_connections ().end ()) {
1370 memset (_buffer, 0, n_samples * sizeof (Sample));
1372 AlsaAudioPort const * source = static_cast<const AlsaAudioPort*>(*it);
1373 assert (source && source->is_output ());
1374 memcpy (_buffer, source->const_buffer (), n_samples * sizeof (Sample));
1375 while (++it != get_connections ().end ()) {
1376 source = static_cast<const AlsaAudioPort*>(*it);
1377 assert (source && source->is_output ());
1378 Sample* dst = buffer ();
1379 const Sample* src = source->const_buffer ();
1380 for (uint32_t s = 0; s < n_samples; ++s, ++dst, ++src) {
1390 AlsaMidiPort::AlsaMidiPort (AlsaAudioBackend &b, const std::string& name, PortFlags flags)
1391 : AlsaPort (b, name, flags)
1396 AlsaMidiPort::~AlsaMidiPort () { }
1398 struct MidiEventSorter {
1399 bool operator() (const boost::shared_ptr<AlsaMidiEvent>& a, const boost::shared_ptr<AlsaMidiEvent>& b) {
1404 void* AlsaMidiPort::get_buffer (pframes_t /* nframes */)
1408 for (std::vector<AlsaPort*>::const_iterator i = get_connections ().begin ();
1409 i != get_connections ().end ();
1411 const AlsaMidiBuffer src = static_cast<const AlsaMidiPort*>(*i)->const_buffer ();
1412 for (AlsaMidiBuffer::const_iterator it = src.begin (); it != src.end (); ++it) {
1413 _buffer.push_back (boost::shared_ptr<AlsaMidiEvent>(new AlsaMidiEvent (**it)));
1416 std::sort (_buffer.begin (), _buffer.end (), MidiEventSorter());
1421 AlsaMidiEvent::AlsaMidiEvent (const pframes_t timestamp, const uint8_t* data, size_t size)
1423 , _timestamp (timestamp)
1427 _data = (uint8_t*) malloc (size);
1428 memcpy (_data, data, size);
1432 AlsaMidiEvent::AlsaMidiEvent (const AlsaMidiEvent& other)
1433 : _size (other.size ())
1434 , _timestamp (other.timestamp ())
1437 if (other.size () && other.const_data ()) {
1438 _data = (uint8_t*) malloc (other.size ());
1439 memcpy (_data, other.const_data (), other.size ());
1443 AlsaMidiEvent::~AlsaMidiEvent () {