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/compose.h"
30 #include "pbd/error.h"
31 #include "pbd/file_utils.h"
32 #include "ardour/filesystem_paths.h"
33 #include "ardour/port_manager.h"
34 #include "ardouralsautil/devicelist.h"
37 using namespace ARDOUR;
39 static std::string s_instance_name;
40 size_t AlsaAudioBackend::_max_buffer_size = 8192;
41 std::vector<std::string> AlsaAudioBackend::_midi_options;
42 std::vector<AudioBackend::DeviceStatus> AlsaAudioBackend::_input_audio_device_status;
43 std::vector<AudioBackend::DeviceStatus> AlsaAudioBackend::_output_audio_device_status;
44 std::vector<AudioBackend::DeviceStatus> AlsaAudioBackend::_duplex_audio_device_status;
45 std::vector<AudioBackend::DeviceStatus> AlsaAudioBackend::_midi_device_status;
47 ALSADeviceInfo AlsaAudioBackend::_input_audio_device_info;
48 ALSADeviceInfo AlsaAudioBackend::_output_audio_device_info;
50 AlsaAudioBackend::AlsaAudioBackend (AudioEngine& e, AudioBackendInfo& info)
51 : AudioBackend (e, info)
56 , _freewheeling (false)
57 , _measure_latency (false)
58 , _last_process_start (0)
59 , _input_audio_device("")
60 , _output_audio_device("")
61 , _midi_driver_option(get_standard_device_name(DeviceNone))
62 , _device_reservation(0)
64 , _samples_per_period (1024)
65 , _periods_per_cycle (2)
68 , _systemic_audio_input_latency (0)
69 , _systemic_audio_output_latency (0)
71 , _processed_samples (0)
72 , _port_change_flag (false)
74 _instance_name = s_instance_name;
75 pthread_mutex_init (&_port_callback_mutex, 0);
76 _input_audio_device_info.valid = false;
77 _output_audio_device_info.valid = false;
80 AlsaAudioBackend::~AlsaAudioBackend ()
82 pthread_mutex_destroy (&_port_callback_mutex);
85 /* AUDIOBACKEND API */
88 AlsaAudioBackend::name () const
94 AlsaAudioBackend::is_realtime () const
99 std::vector<AudioBackend::DeviceStatus>
100 AlsaAudioBackend::enumerate_devices () const
102 _duplex_audio_device_status.clear();
103 std::map<std::string, std::string> devices;
104 get_alsa_audio_device_names(devices);
105 for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
106 if (_input_audio_device == "") _input_audio_device = i->first;
107 if (_output_audio_device == "") _output_audio_device = i->first;
108 _duplex_audio_device_status.push_back (DeviceStatus (i->first, true));
110 return _duplex_audio_device_status;
113 std::vector<AudioBackend::DeviceStatus>
114 AlsaAudioBackend::enumerate_input_devices () const
116 _input_audio_device_status.clear();
117 std::map<std::string, std::string> devices;
118 get_alsa_audio_device_names(devices, HalfDuplexIn);
119 _input_audio_device_status.push_back (DeviceStatus (get_standard_device_name(DeviceNone), true));
120 for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
121 if (_input_audio_device == "") _input_audio_device = i->first;
122 _input_audio_device_status.push_back (DeviceStatus (i->first, true));
124 return _input_audio_device_status;
127 std::vector<AudioBackend::DeviceStatus>
128 AlsaAudioBackend::enumerate_output_devices () const
130 _output_audio_device_status.clear();
131 std::map<std::string, std::string> devices;
132 get_alsa_audio_device_names(devices, HalfDuplexOut);
133 _output_audio_device_status.push_back (DeviceStatus (get_standard_device_name(DeviceNone), true));
134 for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
135 if (_output_audio_device == "") _output_audio_device = i->first;
136 _output_audio_device_status.push_back (DeviceStatus (i->first, true));
138 return _output_audio_device_status;
142 AlsaAudioBackend::reservation_stdout (std::string d, size_t /* s */)
144 if (d.substr(0, 19) == "Acquired audio-card") {
145 _reservation_succeeded = true;
150 AlsaAudioBackend::release_device()
152 _reservation_connection.drop_connections();
153 ARDOUR::SystemExec * tmp = _device_reservation;
154 _device_reservation = 0;
159 AlsaAudioBackend::acquire_device(const char* device_name)
161 /* This is quick hack, ideally we'll link against libdbus and implement a dbus-listener
162 * that owns the device. here we try to get away by just requesting it and then block it...
163 * (pulseaudio periodically checks anyway)
165 * dbus-send --session --print-reply --type=method_call --dest=org.freedesktop.ReserveDevice1.Audio2 /org/freedesktop/ReserveDevice1/Audio2 org.freedesktop.ReserveDevice1.RequestRelease int32:4
166 * -> should not return 'boolean false'
168 int device_number = card_to_num(device_name);
169 if (device_number < 0) return false;
171 assert(_device_reservation == 0);
172 _reservation_succeeded = false;
174 std::string request_device_exe;
175 if (!PBD::find_file (
176 PBD::Searchpath(Glib::build_filename(ARDOUR::ardour_dll_directory(), "ardouralsautil")
177 + G_SEARCHPATH_SEPARATOR_S + ARDOUR::ardour_dll_directory()),
178 "ardour-request-device", request_device_exe))
180 PBD::warning << "ardour-request-device binary was not found..'" << endmsg;
187 argp=(char**) calloc(5,sizeof(char*));
188 argp[0] = strdup(request_device_exe.c_str());
189 argp[1] = strdup("-P");
190 snprintf(tmp, sizeof(tmp), "%d", getpid());
191 argp[2] = strdup(tmp);
192 snprintf(tmp, sizeof(tmp), "Audio%d", device_number);
193 argp[3] = strdup(tmp);
196 _device_reservation = new ARDOUR::SystemExec(request_device_exe, argp);
197 _device_reservation->ReadStdout.connect_same_thread (_reservation_connection, boost::bind (&AlsaAudioBackend::reservation_stdout, this, _1 ,_2));
198 _device_reservation->Terminated.connect_same_thread (_reservation_connection, boost::bind (&AlsaAudioBackend::release_device, this));
199 if (_device_reservation->start(0)) {
200 PBD::warning << _("AlsaAudioBackend: Device Request failed.") << endmsg;
205 // wait to check if reservation suceeded.
206 int timeout = 500; // 5 sec
207 while (_device_reservation && !_reservation_succeeded && --timeout > 0) {
210 if (timeout == 0 || !_reservation_succeeded) {
211 PBD::warning << _("AlsaAudioBackend: Device Reservation failed.") << endmsg;
219 AlsaAudioBackend::available_sample_rates2 (const std::string& input_device, const std::string& output_device) const
221 std::vector<float> sr;
222 if (input_device == get_standard_device_name(DeviceNone) && output_device == get_standard_device_name(DeviceNone)) {
225 else if (input_device == get_standard_device_name(DeviceNone)) {
226 sr = available_sample_rates (output_device);
228 else if (output_device == get_standard_device_name(DeviceNone)) {
229 sr = available_sample_rates (input_device);
231 std::vector<float> sr_in = available_sample_rates (input_device);
232 std::vector<float> sr_out = available_sample_rates (output_device);
233 std::set_intersection (sr_in.begin(), sr_in.end(), sr_out.begin(), sr_out.end(), std::back_inserter(sr));
239 AlsaAudioBackend::available_sample_rates (const std::string& device) const
241 ALSADeviceInfo *nfo = NULL;
242 std::vector<float> sr;
243 if (device == get_standard_device_name(DeviceNone)) {
246 if (device == _input_audio_device && _input_audio_device_info.valid) {
247 nfo = &_input_audio_device_info;
249 else if (device == _output_audio_device && _output_audio_device_info.valid) {
250 nfo = &_output_audio_device_info;
253 static const float avail_rates [] = { 8000, 22050.0, 24000.0, 44100.0, 48000.0, 88200.0, 96000.0, 176400.0, 192000.0 };
255 for (size_t i = 0 ; i < sizeof(avail_rates) / sizeof(float); ++i) {
256 if (!nfo || (avail_rates[i] >= nfo->min_rate && avail_rates[i] <= nfo->max_rate)) {
257 sr.push_back (avail_rates[i]);
264 std::vector<uint32_t>
265 AlsaAudioBackend::available_buffer_sizes2 (const std::string& input_device, const std::string& output_device) const
267 std::vector<uint32_t> bs;
268 if (input_device == get_standard_device_name(DeviceNone) && output_device == get_standard_device_name(DeviceNone)) {
271 else if (input_device == get_standard_device_name(DeviceNone)) {
272 bs = available_buffer_sizes (output_device);
274 else if (output_device == get_standard_device_name(DeviceNone)) {
275 bs = available_buffer_sizes (input_device);
277 std::vector<uint32_t> bs_in = available_buffer_sizes (input_device);
278 std::vector<uint32_t> bs_out = available_buffer_sizes (output_device);
279 std::set_intersection (bs_in.begin(), bs_in.end(), bs_out.begin(), bs_out.end(), std::back_inserter(bs));
284 std::vector<uint32_t>
285 AlsaAudioBackend::available_buffer_sizes (const std::string& device) const
287 ALSADeviceInfo *nfo = NULL;
288 std::vector<uint32_t> bs;
289 if (device == get_standard_device_name(DeviceNone)) {
292 if (device == _input_audio_device && _input_audio_device_info.valid) {
293 nfo = &_input_audio_device_info;
295 else if (device == _output_audio_device && _output_audio_device_info.valid) {
296 nfo = &_output_audio_device_info;
299 static const unsigned long avail_sizes [] = { 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192 };
301 for (size_t i = 0 ; i < sizeof(avail_sizes) / sizeof(unsigned long); ++i) {
302 if (!nfo || (avail_sizes[i] >= nfo->min_size && avail_sizes[i] <= nfo->max_size)) {
303 bs.push_back (avail_sizes[i]);
310 AlsaAudioBackend::available_input_channel_count (const std::string& device) const
312 if (device == get_standard_device_name(DeviceNone)) {
315 if (device == _input_audio_device && _input_audio_device_info.valid) {
316 return _input_audio_device_info.max_channels;
322 AlsaAudioBackend::available_output_channel_count (const std::string& device) const
324 if (device == get_standard_device_name(DeviceNone)) {
327 if (device == _output_audio_device && _output_audio_device_info.valid) {
328 return _output_audio_device_info.max_channels;
334 AlsaAudioBackend::can_change_sample_rate_when_running () const
340 AlsaAudioBackend::can_change_buffer_size_when_running () const
342 return false; // why not? :)
346 AlsaAudioBackend::set_input_device_name (const std::string& d)
348 if (_input_audio_device == d) {
351 _input_audio_device = d;
353 if (d == get_standard_device_name(DeviceNone)) {
354 _input_audio_device_info.valid = false;
357 std::string alsa_device;
358 std::map<std::string, std::string> devices;
360 get_alsa_audio_device_names(devices, HalfDuplexIn);
361 for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
363 alsa_device = i->second;
367 if (alsa_device == "") {
368 _input_audio_device_info.valid = false;
371 /* device will be busy once used, hence cache the parameters */
372 /* return */ get_alsa_device_parameters (alsa_device.c_str(), true, &_input_audio_device_info);
377 AlsaAudioBackend::set_output_device_name (const std::string& d)
379 if (_output_audio_device == d) {
383 _output_audio_device = d;
385 if (d == get_standard_device_name(DeviceNone)) {
386 _output_audio_device_info.valid = false;
389 std::string alsa_device;
390 std::map<std::string, std::string> devices;
392 get_alsa_audio_device_names(devices, HalfDuplexOut);
393 for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
395 alsa_device = i->second;
399 if (alsa_device == "") {
400 _output_audio_device_info.valid = false;
403 /* return */ get_alsa_device_parameters (alsa_device.c_str(), true, &_output_audio_device_info);
408 AlsaAudioBackend::set_device_name (const std::string& d)
411 rv |= set_input_device_name (d);
412 rv |= set_output_device_name (d);
417 AlsaAudioBackend::set_sample_rate (float sr)
419 if (sr <= 0) { return -1; }
421 engine.sample_rate_change (sr);
426 AlsaAudioBackend::set_buffer_size (uint32_t bs)
428 if (bs <= 0 || bs >= _max_buffer_size) {
434 _samples_per_period = bs;
435 engine.buffer_size_change (bs);
440 AlsaAudioBackend::set_interleaved (bool yn)
442 if (!yn) { return 0; }
447 AlsaAudioBackend::set_input_channels (uint32_t cc)
454 AlsaAudioBackend::set_output_channels (uint32_t cc)
461 AlsaAudioBackend::set_systemic_input_latency (uint32_t sl)
463 _systemic_audio_input_latency = sl;
468 AlsaAudioBackend::set_systemic_output_latency (uint32_t sl)
470 _systemic_audio_output_latency = sl;
475 AlsaAudioBackend::set_systemic_midi_input_latency (std::string const device, uint32_t sl)
477 struct AlsaMidiDeviceInfo * nfo = midi_device_info(device);
479 nfo->systemic_input_latency = sl;
484 AlsaAudioBackend::set_systemic_midi_output_latency (std::string const device, uint32_t sl)
486 struct AlsaMidiDeviceInfo * nfo = midi_device_info(device);
488 nfo->systemic_output_latency = sl;
492 /* Retrieving parameters */
494 AlsaAudioBackend::device_name () const
496 if (_input_audio_device != get_standard_device_name(DeviceNone)) {
497 return _input_audio_device;
499 if (_output_audio_device != get_standard_device_name(DeviceNone)) {
500 return _output_audio_device;
506 AlsaAudioBackend::input_device_name () const
508 return _input_audio_device;
512 AlsaAudioBackend::output_device_name () const
514 return _output_audio_device;
518 AlsaAudioBackend::sample_rate () const
524 AlsaAudioBackend::buffer_size () const
526 return _samples_per_period;
530 AlsaAudioBackend::interleaved () const
536 AlsaAudioBackend::input_channels () const
542 AlsaAudioBackend::output_channels () const
548 AlsaAudioBackend::systemic_input_latency () const
550 return _systemic_audio_input_latency;
554 AlsaAudioBackend::systemic_output_latency () const
556 return _systemic_audio_output_latency;
560 AlsaAudioBackend::systemic_midi_input_latency (std::string const device) const
562 struct AlsaMidiDeviceInfo * nfo = midi_device_info(device);
564 return nfo->systemic_input_latency;
568 AlsaAudioBackend::systemic_midi_output_latency (std::string const device) const
570 struct AlsaMidiDeviceInfo * nfo = midi_device_info(device);
572 return nfo->systemic_output_latency;
576 struct AlsaAudioBackend::AlsaMidiDeviceInfo *
577 AlsaAudioBackend::midi_device_info(std::string const name) const {
578 for (std::map<std::string, struct AlsaMidiDeviceInfo*>::const_iterator i = _midi_devices.begin (); i != _midi_devices.end(); ++i) {
579 if (i->first == name) {
584 assert(_midi_driver_option != get_standard_device_name(DeviceNone));
586 std::map<std::string, std::string> devices;
587 if (_midi_driver_option == _("ALSA raw devices")) {
588 get_alsa_rawmidi_device_names(devices);
590 get_alsa_sequencer_names (devices);
593 for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
594 if (i->first == name) {
595 _midi_devices[name] = new AlsaMidiDeviceInfo();
596 return _midi_devices[name];
602 std::vector<std::string>
603 AlsaAudioBackend::enumerate_midi_options () const
605 if (_midi_options.empty()) {
606 _midi_options.push_back (_("ALSA raw devices"));
607 _midi_options.push_back (_("ALSA sequencer"));
608 _midi_options.push_back (get_standard_device_name(DeviceNone));
610 return _midi_options;
613 std::vector<AudioBackend::DeviceStatus>
614 AlsaAudioBackend::enumerate_midi_devices () const
616 _midi_device_status.clear();
617 std::map<std::string, std::string> devices;
619 if (_midi_driver_option == _("ALSA raw devices")) {
620 get_alsa_rawmidi_device_names (devices);
622 else if (_midi_driver_option == _("ALSA sequencer")) {
623 get_alsa_sequencer_names (devices);
626 for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
627 _midi_device_status.push_back (DeviceStatus (i->first, true));
629 return _midi_device_status;
633 AlsaAudioBackend::set_midi_option (const std::string& opt)
635 if (opt != get_standard_device_name(DeviceNone) && opt != _("ALSA raw devices") && opt != _("ALSA sequencer")) {
638 _midi_driver_option = opt;
643 AlsaAudioBackend::midi_option () const
645 return _midi_driver_option;
649 AlsaAudioBackend::set_midi_device_enabled (std::string const device, bool enable)
651 struct AlsaMidiDeviceInfo * nfo = midi_device_info(device);
653 nfo->enabled = enable;
658 AlsaAudioBackend::midi_device_enabled (std::string const device) const
660 struct AlsaMidiDeviceInfo * nfo = midi_device_info(device);
661 if (!nfo) return false;
667 static void * pthread_process (void *arg)
669 AlsaAudioBackend *d = static_cast<AlsaAudioBackend *>(arg);
670 d->main_process_thread ();
676 AlsaAudioBackend::_start (bool for_latency_measurement)
678 if (!_active && _run) {
679 // recover from 'halted', reap threads
683 if (_active || _run) {
684 PBD::error << _("AlsaAudioBackend: already active.") << endmsg;
689 PBD::warning << _("AlsaAudioBackend: recovering from unclean shutdown, port registry is not empty.") << endmsg;
690 _system_inputs.clear();
691 _system_outputs.clear();
692 _system_midi_in.clear();
693 _system_midi_out.clear();
697 /* reset internal state */
699 _freewheeling = false;
701 _last_process_start = 0;
705 assert(_rmidi_in.size() == 0);
706 assert(_rmidi_out.size() == 0);
710 std::string audio_device;
711 std::string alsa_device;
712 std::map<std::string, std::string> devices;
714 if (_input_audio_device == get_standard_device_name(DeviceNone) && _output_audio_device == get_standard_device_name(DeviceNone)) {
715 PBD::error << _("AlsaAudioBackend: At least one of input or output device needs to be set.");
719 if (_input_audio_device != _output_audio_device) {
720 if (_input_audio_device != get_standard_device_name(DeviceNone) && _output_audio_device != get_standard_device_name(DeviceNone)) {
721 PBD::error << _("AlsaAudioBackend: Cannot use two different devices.");
724 if (_input_audio_device != get_standard_device_name(DeviceNone)) {
725 get_alsa_audio_device_names(devices, HalfDuplexIn);
726 audio_device = _input_audio_device;
729 get_alsa_audio_device_names(devices, HalfDuplexOut);
730 audio_device = _output_audio_device;
734 get_alsa_audio_device_names(devices);
735 audio_device = _input_audio_device;
739 for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
740 if (i->first == audio_device) {
741 alsa_device = i->second;
745 if (alsa_device == "") {
746 PBD::error << _("AlsaAudioBackend: Cannot find configured device. Is it still connected?");
750 acquire_device(alsa_device.c_str());
751 _pcmi = new Alsa_pcmi (
752 (duplex & 2) ? alsa_device.c_str() : NULL,
753 (duplex & 1) ? alsa_device.c_str() : NULL,
754 0, _samplerate, _samples_per_period, _periods_per_cycle, 0);
755 switch (_pcmi->state ()) {
756 case 0: /* OK */ break;
757 case -1: PBD::error << _("AlsaAudioBackend: failed to open device.") << endmsg; break;
758 case -2: PBD::error << _("AlsaAudioBackend: failed to allocate parameters.") << endmsg; break;
759 case -3: PBD::error << _("AlsaAudioBackend: cannot set requested sample rate.") << endmsg; break;
760 case -4: PBD::error << _("AlsaAudioBackend: cannot set requested period size.") << endmsg; break;
761 case -5: PBD::error << _("AlsaAudioBackend: cannot set requested number of periods.") << endmsg; break;
762 case -6: PBD::error << _("AlsaAudioBackend: unsupported sample format.") << endmsg; break;
763 default: PBD::error << _("AlsaAudioBackend: initialization failed.") << endmsg; break;
765 if (_pcmi->state ()) {
766 delete _pcmi; _pcmi = 0;
775 if (_n_outputs != _pcmi->nplay ()) {
776 if (_n_outputs == 0) {
777 _n_outputs = _pcmi->nplay ();
779 _n_outputs = std::min (_n_outputs, _pcmi->nplay ());
781 PBD::warning << _("AlsaAudioBackend: adjusted output channel count to match device.") << endmsg;
784 if (_n_inputs != _pcmi->ncapt ()) {
785 if (_n_inputs == 0) {
786 _n_inputs = _pcmi->ncapt ();
788 _n_inputs = std::min (_n_inputs, _pcmi->ncapt ());
790 PBD::warning << _("AlsaAudioBackend: adjusted input channel count to match device.") << endmsg;
793 if (_pcmi->fsize() != _samples_per_period) {
794 _samples_per_period = _pcmi->fsize();
795 PBD::warning << _("AlsaAudioBackend: samples per period does not match.") << endmsg;
798 if (_pcmi->fsamp() != _samplerate) {
799 _samplerate = _pcmi->fsamp();
800 engine.sample_rate_change (_samplerate);
801 PBD::warning << _("AlsaAudioBackend: sample rate does not match.") << endmsg;
804 _measure_latency = for_latency_measurement;
806 register_system_midi_ports();
808 if (register_system_audio_ports()) {
809 PBD::error << _("AlsaAudioBackend: failed to register system ports.") << endmsg;
810 delete _pcmi; _pcmi = 0;
815 engine.sample_rate_change (_samplerate);
816 engine.buffer_size_change (_samples_per_period);
818 if (engine.reestablish_ports ()) {
819 PBD::error << _("AlsaAudioBackend: Could not re-establish ports.") << endmsg;
820 delete _pcmi; _pcmi = 0;
825 engine.reconnect_ports ();
827 _port_change_flag = false;
829 if (_realtime_pthread_create (SCHED_FIFO, -20, 100000,
830 &_main_thread, pthread_process, this))
832 if (pthread_create (&_main_thread, NULL, pthread_process, this))
834 PBD::error << _("AlsaAudioBackend: failed to create process thread.") << endmsg;
835 delete _pcmi; _pcmi = 0;
840 PBD::warning << _("AlsaAudioBackend: cannot acquire realtime permissions.") << endmsg;
845 while (!_active && --timeout > 0) { Glib::usleep (1000); }
847 if (timeout == 0 || !_active) {
848 PBD::error << _("AlsaAudioBackend: failed to start process thread.") << endmsg;
849 delete _pcmi; _pcmi = 0;
859 AlsaAudioBackend::stop ()
867 if (pthread_join (_main_thread, &status)) {
868 PBD::error << _("AlsaAudioBackend: failed to terminate.") << endmsg;
872 while (!_rmidi_out.empty ()) {
873 AlsaMidiIO *m = _rmidi_out.back ();
875 _rmidi_out.pop_back ();
878 while (!_rmidi_in.empty ()) {
879 AlsaMidiIO *m = _rmidi_in.back ();
881 _rmidi_in.pop_back ();
886 delete _pcmi; _pcmi = 0;
889 return (_active == false) ? 0 : -1;
893 AlsaAudioBackend::freewheel (bool onoff)
895 _freewheeling = onoff;
900 AlsaAudioBackend::dsp_load () const
902 return std::min(100.f, 100.f * _dsp_load);
906 AlsaAudioBackend::raw_buffer_size (DataType t)
909 case DataType::AUDIO:
910 return _samples_per_period * sizeof(Sample);
912 return _max_buffer_size; // XXX not really limited
919 AlsaAudioBackend::sample_time ()
921 return _processed_samples;
925 AlsaAudioBackend::sample_time_at_cycle_start ()
927 return _processed_samples;
931 AlsaAudioBackend::samples_since_cycle_start ()
933 if (!_active || !_run || _freewheeling || _freewheel) {
936 if (_last_process_start == 0) {
940 const int64_t elapsed_time_us = g_get_monotonic_time() - _last_process_start;
941 return std::max((pframes_t)0, (pframes_t)rint(1e-6 * elapsed_time_us * _samplerate));
946 AlsaAudioBackend::alsa_process_thread (void *arg)
948 ThreadData* td = reinterpret_cast<ThreadData*> (arg);
949 boost::function<void ()> f = td->f;
956 AlsaAudioBackend::create_process_thread (boost::function<void()> func)
960 size_t stacksize = 100000;
962 ThreadData* td = new ThreadData (this, func, stacksize);
964 if (_realtime_pthread_create (SCHED_FIFO, -21, stacksize,
965 &thread_id, alsa_process_thread, td)) {
966 pthread_attr_init (&attr);
967 pthread_attr_setstacksize (&attr, stacksize);
968 if (pthread_create (&thread_id, &attr, alsa_process_thread, td)) {
969 PBD::error << _("AudioEngine: cannot create process thread.") << endmsg;
970 pthread_attr_destroy (&attr);
973 pthread_attr_destroy (&attr);
976 _threads.push_back (thread_id);
981 AlsaAudioBackend::join_process_threads ()
985 for (std::vector<pthread_t>::const_iterator i = _threads.begin (); i != _threads.end (); ++i)
988 if (pthread_join (*i, &status)) {
989 PBD::error << _("AudioEngine: cannot terminate process thread.") << endmsg;
998 AlsaAudioBackend::in_process_thread ()
1000 if (pthread_equal (_main_thread, pthread_self()) != 0) {
1004 for (std::vector<pthread_t>::const_iterator i = _threads.begin (); i != _threads.end (); ++i)
1006 if (pthread_equal (*i, pthread_self ()) != 0) {
1014 AlsaAudioBackend::process_thread_count ()
1016 return _threads.size ();
1020 AlsaAudioBackend::update_latencies ()
1022 // trigger latency callback in RT thread (locked graph)
1023 port_connect_add_remove_callback();
1026 /* PORTENGINE API */
1029 AlsaAudioBackend::private_handle () const
1035 AlsaAudioBackend::my_name () const
1037 return _instance_name;
1041 AlsaAudioBackend::available () const
1043 return _run && _active;
1047 AlsaAudioBackend::port_name_size () const
1053 AlsaAudioBackend::set_port_name (PortEngine::PortHandle port, const std::string& name)
1055 if (!valid_port (port)) {
1056 PBD::error << _("AlsaBackend::set_port_name: Invalid Port(s)") << endmsg;
1059 return static_cast<AlsaPort*>(port)->set_name (_instance_name + ":" + name);
1063 AlsaAudioBackend::get_port_name (PortEngine::PortHandle port) const
1065 if (!valid_port (port)) {
1066 PBD::error << _("AlsaBackend::get_port_name: Invalid Port(s)") << endmsg;
1067 return std::string ();
1069 return static_cast<AlsaPort*>(port)->name ();
1072 PortEngine::PortHandle
1073 AlsaAudioBackend::get_port_by_name (const std::string& name) const
1075 PortHandle port = (PortHandle) find_port (name);
1080 AlsaAudioBackend::get_ports (
1081 const std::string& port_name_pattern,
1082 DataType type, PortFlags flags,
1083 std::vector<std::string>& port_names) const
1087 bool use_regexp = false;
1088 if (port_name_pattern.size () > 0) {
1089 if (!regcomp (&port_regex, port_name_pattern.c_str (), REG_EXTENDED|REG_NOSUB)) {
1093 for (size_t i = 0; i < _ports.size (); ++i) {
1094 AlsaPort* port = _ports[i];
1095 if ((port->type () == type) && flags == (port->flags () & flags)) {
1096 if (!use_regexp || !regexec (&port_regex, port->name ().c_str (), 0, NULL, 0)) {
1097 port_names.push_back (port->name ());
1103 regfree (&port_regex);
1109 AlsaAudioBackend::port_data_type (PortEngine::PortHandle port) const
1111 if (!valid_port (port)) {
1112 return DataType::NIL;
1114 return static_cast<AlsaPort*>(port)->type ();
1117 PortEngine::PortHandle
1118 AlsaAudioBackend::register_port (
1119 const std::string& name,
1120 ARDOUR::DataType type,
1121 ARDOUR::PortFlags flags)
1123 if (name.size () == 0) { return 0; }
1124 if (flags & IsPhysical) { return 0; }
1125 return add_port (_instance_name + ":" + name, type, flags);
1128 PortEngine::PortHandle
1129 AlsaAudioBackend::add_port (
1130 const std::string& name,
1131 ARDOUR::DataType type,
1132 ARDOUR::PortFlags flags)
1134 assert(name.size ());
1135 if (find_port (name)) {
1136 PBD::error << _("AlsaBackend::register_port: Port already exists:")
1137 << " (" << name << ")" << endmsg;
1140 AlsaPort* port = NULL;
1142 case DataType::AUDIO:
1143 port = new AlsaAudioPort (*this, name, flags);
1145 case DataType::MIDI:
1146 port = new AlsaMidiPort (*this, name, flags);
1149 PBD::error << _("AlsaBackend::register_port: Invalid Data Type.") << endmsg;
1153 _ports.push_back (port);
1159 AlsaAudioBackend::unregister_port (PortEngine::PortHandle port_handle)
1164 AlsaPort* port = static_cast<AlsaPort*>(port_handle);
1165 std::vector<AlsaPort*>::iterator i = std::find (_ports.begin (), _ports.end (), static_cast<AlsaPort*>(port_handle));
1166 if (i == _ports.end ()) {
1167 PBD::error << _("AlsaBackend::unregister_port: Failed to find port") << endmsg;
1170 disconnect_all(port_handle);
1176 AlsaAudioBackend::register_system_audio_ports()
1180 const int a_ins = _n_inputs;
1181 const int a_out = _n_outputs;
1184 lr.min = lr.max = (_measure_latency ? 0 : _systemic_audio_input_latency);
1185 for (int i = 1; i <= a_ins; ++i) {
1187 snprintf(tmp, sizeof(tmp), "system:capture_%d", i);
1188 PortHandle p = add_port(std::string(tmp), DataType::AUDIO, static_cast<PortFlags>(IsOutput | IsPhysical | IsTerminal));
1190 set_latency_range (p, false, lr);
1191 _system_inputs.push_back(static_cast<AlsaPort*>(p));
1194 lr.min = lr.max = (_measure_latency ? 0 : _systemic_audio_output_latency);
1195 for (int i = 1; i <= a_out; ++i) {
1197 snprintf(tmp, sizeof(tmp), "system:playback_%d", i);
1198 PortHandle p = add_port(std::string(tmp), DataType::AUDIO, static_cast<PortFlags>(IsInput | IsPhysical | IsTerminal));
1200 set_latency_range (p, true, lr);
1201 _system_outputs.push_back(static_cast<AlsaPort*>(p));
1207 AlsaAudioBackend::register_system_midi_ports()
1209 std::map<std::string, std::string> devices;
1213 if (_midi_driver_option == get_standard_device_name(DeviceNone)) {
1215 } else if (_midi_driver_option == _("ALSA raw devices")) {
1216 get_alsa_rawmidi_device_names(devices);
1218 get_alsa_sequencer_names (devices);
1221 for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
1222 struct AlsaMidiDeviceInfo * nfo = midi_device_info(i->first);
1224 if (!nfo->enabled) continue;
1227 if (_midi_driver_option == _("ALSA raw devices")) {
1228 mout = new AlsaRawMidiOut (i->second.c_str());
1230 mout = new AlsaSeqMidiOut (i->second.c_str());
1233 if (mout->state ()) {
1234 PBD::warning << string_compose (
1235 _("AlsaMidiOut: failed to open midi device '%1'."), i->second)
1239 mout->setup_timing(_samples_per_period, _samplerate);
1240 mout->sync_time (g_get_monotonic_time());
1241 if (mout->start ()) {
1242 PBD::warning << string_compose (
1243 _("AlsaMidiOut: failed to start midi device '%1'."), i->second)
1248 snprintf(tmp, sizeof(tmp), "system:midi_playback_%d", ++midi_ins);
1249 PortHandle p = add_port(std::string(tmp), DataType::MIDI, static_cast<PortFlags>(IsInput | IsPhysical | IsTerminal));
1255 lr.min = lr.max = (_measure_latency ? 0 : nfo->systemic_output_latency);
1256 set_latency_range (p, false, lr);
1257 static_cast<AlsaMidiPort*>(p)->set_n_periods(2);
1258 _system_midi_out.push_back(static_cast<AlsaPort*>(p));
1259 _rmidi_out.push_back (mout);
1264 if (_midi_driver_option == _("ALSA raw devices")) {
1265 midin = new AlsaRawMidiIn (i->second.c_str());
1267 midin = new AlsaSeqMidiIn (i->second.c_str());
1270 if (midin->state ()) {
1271 PBD::warning << string_compose (
1272 _("AlsaMidiIn: failed to open midi device '%1'."), i->second)
1276 midin->setup_timing(_samples_per_period, _samplerate);
1277 midin->sync_time (g_get_monotonic_time());
1278 if (midin->start ()) {
1279 PBD::warning << string_compose (
1280 _("AlsaMidiIn: failed to start midi device '%1'."), i->second)
1285 snprintf(tmp, sizeof(tmp), "system:midi_capture_%d", ++midi_outs);
1286 PortHandle p = add_port(std::string(tmp), DataType::MIDI, static_cast<PortFlags>(IsOutput | IsPhysical | IsTerminal));
1293 lr.min = lr.max = (_measure_latency ? 0 : nfo->systemic_input_latency);
1294 set_latency_range (p, false, lr);
1295 _system_midi_in.push_back(static_cast<AlsaPort*>(p));
1296 _rmidi_in.push_back (midin);
1304 AlsaAudioBackend::unregister_ports (bool system_only)
1307 _system_inputs.clear();
1308 _system_outputs.clear();
1309 _system_midi_in.clear();
1310 _system_midi_out.clear();
1311 while (i < _ports.size ()) {
1312 AlsaPort* port = _ports[i];
1313 if (! system_only || (port->is_physical () && port->is_terminal ())) {
1314 port->disconnect_all ();
1316 _ports.erase (_ports.begin() + i);
1324 AlsaAudioBackend::connect (const std::string& src, const std::string& dst)
1326 AlsaPort* src_port = find_port (src);
1327 AlsaPort* dst_port = find_port (dst);
1330 PBD::error << _("AlsaBackend::connect: Invalid Source port:")
1331 << " (" << src <<")" << endmsg;
1335 PBD::error << _("AlsaBackend::connect: Invalid Destination port:")
1336 << " (" << dst <<")" << endmsg;
1339 return src_port->connect (dst_port);
1343 AlsaAudioBackend::disconnect (const std::string& src, const std::string& dst)
1345 AlsaPort* src_port = find_port (src);
1346 AlsaPort* dst_port = find_port (dst);
1348 if (!src_port || !dst_port) {
1349 PBD::error << _("AlsaBackend::disconnect: Invalid Port(s)") << endmsg;
1352 return src_port->disconnect (dst_port);
1356 AlsaAudioBackend::connect (PortEngine::PortHandle src, const std::string& dst)
1358 AlsaPort* dst_port = find_port (dst);
1359 if (!valid_port (src)) {
1360 PBD::error << _("AlsaBackend::connect: Invalid Source Port Handle") << endmsg;
1364 PBD::error << _("AlsaBackend::connect: Invalid Destination Port")
1365 << " (" << dst << ")" << endmsg;
1368 return static_cast<AlsaPort*>(src)->connect (dst_port);
1372 AlsaAudioBackend::disconnect (PortEngine::PortHandle src, const std::string& dst)
1374 AlsaPort* dst_port = find_port (dst);
1375 if (!valid_port (src) || !dst_port) {
1376 PBD::error << _("AlsaBackend::disconnect: Invalid Port(s)") << endmsg;
1379 return static_cast<AlsaPort*>(src)->disconnect (dst_port);
1383 AlsaAudioBackend::disconnect_all (PortEngine::PortHandle port)
1385 if (!valid_port (port)) {
1386 PBD::error << _("AlsaBackend::disconnect_all: Invalid Port") << endmsg;
1389 static_cast<AlsaPort*>(port)->disconnect_all ();
1394 AlsaAudioBackend::connected (PortEngine::PortHandle port, bool /* process_callback_safe*/)
1396 if (!valid_port (port)) {
1397 PBD::error << _("AlsaBackend::disconnect_all: Invalid Port") << endmsg;
1400 return static_cast<AlsaPort*>(port)->is_connected ();
1404 AlsaAudioBackend::connected_to (PortEngine::PortHandle src, const std::string& dst, bool /*process_callback_safe*/)
1406 AlsaPort* dst_port = find_port (dst);
1407 if (!valid_port (src) || !dst_port) {
1408 PBD::error << _("AlsaBackend::connected_to: Invalid Port") << endmsg;
1411 return static_cast<AlsaPort*>(src)->is_connected (dst_port);
1415 AlsaAudioBackend::physically_connected (PortEngine::PortHandle port, bool /*process_callback_safe*/)
1417 if (!valid_port (port)) {
1418 PBD::error << _("AlsaBackend::physically_connected: Invalid Port") << endmsg;
1421 return static_cast<AlsaPort*>(port)->is_physically_connected ();
1425 AlsaAudioBackend::get_connections (PortEngine::PortHandle port, std::vector<std::string>& names, bool /*process_callback_safe*/)
1427 if (!valid_port (port)) {
1428 PBD::error << _("AlsaBackend::get_connections: Invalid Port") << endmsg;
1432 assert (0 == names.size ());
1434 const std::vector<AlsaPort*>& connected_ports = static_cast<AlsaPort*>(port)->get_connections ();
1436 for (std::vector<AlsaPort*>::const_iterator i = connected_ports.begin (); i != connected_ports.end (); ++i) {
1437 names.push_back ((*i)->name ());
1440 return (int)names.size ();
1445 AlsaAudioBackend::midi_event_get (
1446 pframes_t& timestamp,
1447 size_t& size, uint8_t** buf, void* port_buffer,
1448 uint32_t event_index)
1450 assert (buf && port_buffer);
1451 AlsaMidiBuffer& source = * static_cast<AlsaMidiBuffer*>(port_buffer);
1452 if (event_index >= source.size ()) {
1455 AlsaMidiEvent * const event = source[event_index].get ();
1457 timestamp = event->timestamp ();
1458 size = event->size ();
1459 *buf = event->data ();
1464 AlsaAudioBackend::midi_event_put (
1466 pframes_t timestamp,
1467 const uint8_t* buffer, size_t size)
1469 assert (buffer && port_buffer);
1470 AlsaMidiBuffer& dst = * static_cast<AlsaMidiBuffer*>(port_buffer);
1471 if (dst.size () && (pframes_t)dst.back ()->timestamp () > timestamp) {
1473 // nevermind, ::get_buffer() sorts events
1474 fprintf (stderr, "AlsaMidiBuffer: it's too late for this event. %d > %d\n",
1475 (pframes_t)dst.back ()->timestamp (), timestamp);
1478 dst.push_back (boost::shared_ptr<AlsaMidiEvent>(new AlsaMidiEvent (timestamp, buffer, size)));
1483 AlsaAudioBackend::get_midi_event_count (void* port_buffer)
1485 assert (port_buffer);
1486 return static_cast<AlsaMidiBuffer*>(port_buffer)->size ();
1490 AlsaAudioBackend::midi_clear (void* port_buffer)
1492 assert (port_buffer);
1493 AlsaMidiBuffer * buf = static_cast<AlsaMidiBuffer*>(port_buffer);
1501 AlsaAudioBackend::can_monitor_input () const
1507 AlsaAudioBackend::request_input_monitoring (PortEngine::PortHandle, bool)
1513 AlsaAudioBackend::ensure_input_monitoring (PortEngine::PortHandle, bool)
1519 AlsaAudioBackend::monitoring_input (PortEngine::PortHandle)
1524 /* Latency management */
1527 AlsaAudioBackend::set_latency_range (PortEngine::PortHandle port, bool for_playback, LatencyRange latency_range)
1529 if (!valid_port (port)) {
1530 PBD::error << _("AlsaPort::set_latency_range (): invalid port.") << endmsg;
1532 static_cast<AlsaPort*>(port)->set_latency_range (latency_range, for_playback);
1536 AlsaAudioBackend::get_latency_range (PortEngine::PortHandle port, bool for_playback)
1539 if (!valid_port (port)) {
1540 PBD::error << _("AlsaPort::get_latency_range (): invalid port.") << endmsg;
1545 AlsaPort *p = static_cast<AlsaPort*>(port);
1548 r = p->latency_range (for_playback);
1549 if (p->is_physical() && p->is_terminal()) {
1550 if (p->is_input() && for_playback) {
1551 r.min += _samples_per_period;
1552 r.max += _samples_per_period;
1554 if (p->is_output() && !for_playback) {
1555 r.min += _samples_per_period;
1556 r.max += _samples_per_period;
1562 /* Discovering physical ports */
1565 AlsaAudioBackend::port_is_physical (PortEngine::PortHandle port) const
1567 if (!valid_port (port)) {
1568 PBD::error << _("AlsaPort::port_is_physical (): invalid port.") << endmsg;
1571 return static_cast<AlsaPort*>(port)->is_physical ();
1575 AlsaAudioBackend::get_physical_outputs (DataType type, std::vector<std::string>& port_names)
1577 for (size_t i = 0; i < _ports.size (); ++i) {
1578 AlsaPort* port = _ports[i];
1579 if ((port->type () == type) && port->is_input () && port->is_physical ()) {
1580 port_names.push_back (port->name ());
1586 AlsaAudioBackend::get_physical_inputs (DataType type, std::vector<std::string>& port_names)
1588 for (size_t i = 0; i < _ports.size (); ++i) {
1589 AlsaPort* port = _ports[i];
1590 if ((port->type () == type) && port->is_output () && port->is_physical ()) {
1591 port_names.push_back (port->name ());
1597 AlsaAudioBackend::n_physical_outputs () const
1601 for (size_t i = 0; i < _ports.size (); ++i) {
1602 AlsaPort* port = _ports[i];
1603 if (port->is_output () && port->is_physical ()) {
1604 switch (port->type ()) {
1605 case DataType::AUDIO: ++n_audio; break;
1606 case DataType::MIDI: ++n_midi; break;
1612 cc.set (DataType::AUDIO, n_audio);
1613 cc.set (DataType::MIDI, n_midi);
1618 AlsaAudioBackend::n_physical_inputs () const
1622 for (size_t i = 0; i < _ports.size (); ++i) {
1623 AlsaPort* port = _ports[i];
1624 if (port->is_input () && port->is_physical ()) {
1625 switch (port->type ()) {
1626 case DataType::AUDIO: ++n_audio; break;
1627 case DataType::MIDI: ++n_midi; break;
1633 cc.set (DataType::AUDIO, n_audio);
1634 cc.set (DataType::MIDI, n_midi);
1638 /* Getting access to the data buffer for a port */
1641 AlsaAudioBackend::get_buffer (PortEngine::PortHandle port, pframes_t nframes)
1644 assert (valid_port (port));
1645 return static_cast<AlsaPort*>(port)->get_buffer (nframes);
1648 /* Engine Process */
1650 AlsaAudioBackend::main_process_thread ()
1652 AudioEngine::thread_init_callback (this);
1654 _processed_samples = 0;
1656 uint64_t clock1, clock2;
1657 _pcmi->pcm_start ();
1658 int no_proc_errors = 0;
1659 const int bailout = 2 * _samplerate / _samples_per_period;
1660 const int64_t nominal_time = 1e6 * _samples_per_period / _samplerate;
1662 manager.registration_callback();
1663 manager.graph_order_callback();
1669 if (_freewheeling != _freewheel) {
1670 _freewheel = _freewheeling;
1671 engine.freewheel_callback (_freewheel);
1675 nr = _pcmi->pcm_wait ();
1677 if (_pcmi->state () > 0) {
1681 if (_pcmi->state () < 0) {
1682 PBD::error << _("AlsaAudioBackend: I/O error. Audio Process Terminated.") << endmsg;
1685 if (no_proc_errors > bailout) {
1688 _("AlsaAudioBackend: Audio Process Terminated after %1 consecutive x-runs."),
1694 while (nr >= (long)_samples_per_period && _freewheeling == _freewheel) {
1696 clock1 = g_get_monotonic_time();
1699 _pcmi->capt_init (_samples_per_period);
1700 for (std::vector<AlsaPort*>::const_iterator it = _system_inputs.begin (); it != _system_inputs.end (); ++it, ++i) {
1701 _pcmi->capt_chan (i, (float*)((*it)->get_buffer(_samples_per_period)), _samples_per_period);
1703 _pcmi->capt_done (_samples_per_period);
1705 /* de-queue incoming midi*/
1707 for (std::vector<AlsaPort*>::const_iterator it = _system_midi_in.begin (); it != _system_midi_in.end (); ++it, ++i) {
1708 assert (_rmidi_in.size() > i);
1709 AlsaMidiIn *rm = _rmidi_in.at(i);
1710 void *bptr = (*it)->get_buffer(0);
1712 uint8_t data[64]; // match MaxAlsaEventSize in alsa_rawmidi.cc
1713 size_t size = sizeof(data);
1715 while (rm->recv_event (time, data, size)) {
1716 midi_event_put(bptr, time, data, size);
1717 size = sizeof(data);
1719 rm->sync_time (clock1);
1722 for (std::vector<AlsaPort*>::const_iterator it = _system_outputs.begin (); it != _system_outputs.end (); ++it) {
1723 memset ((*it)->get_buffer (_samples_per_period), 0, _samples_per_period * sizeof (Sample));
1726 /* call engine process callback */
1727 _last_process_start = g_get_monotonic_time();
1728 if (engine.process_callback (_samples_per_period)) {
1734 for (std::vector<AlsaPort*>::iterator it = _system_midi_out.begin (); it != _system_midi_out.end (); ++it) {
1735 static_cast<AlsaMidiPort*>(*it)->next_period();
1738 /* queue outgoing midi */
1740 for (std::vector<AlsaPort*>::const_iterator it = _system_midi_out.begin (); it != _system_midi_out.end (); ++it, ++i) {
1741 assert (_rmidi_out.size() > i);
1742 const AlsaMidiBuffer * src = static_cast<const AlsaMidiPort*>(*it)->const_buffer();
1743 AlsaMidiOut *rm = _rmidi_out.at(i);
1744 rm->sync_time (clock1);
1745 for (AlsaMidiBuffer::const_iterator mit = src->begin (); mit != src->end (); ++mit) {
1746 rm->send_event ((*mit)->timestamp(), (*mit)->data(), (*mit)->size());
1750 /* write back audio */
1752 _pcmi->play_init (_samples_per_period);
1753 for (std::vector<AlsaPort*>::const_iterator it = _system_outputs.begin (); it != _system_outputs.end (); ++it, ++i) {
1754 _pcmi->play_chan (i, (const float*)(*it)->get_buffer (_samples_per_period), _samples_per_period);
1756 for (; i < _pcmi->nplay (); ++i) {
1757 _pcmi->clear_chan (i, _samples_per_period);
1759 _pcmi->play_done (_samples_per_period);
1760 nr -= _samples_per_period;
1761 _processed_samples += _samples_per_period;
1763 /* calculate DSP load */
1764 clock2 = g_get_monotonic_time();
1765 const int64_t elapsed_time = clock2 - clock1;
1767 const float load = elapsed_time / (float) nominal_time;
1768 if (load > _dsp_load) {
1771 const float a = .2 * _samples_per_period / _samplerate;
1772 _dsp_load = _dsp_load + a * (load - _dsp_load) + 1e-12;
1776 if (xrun && (_pcmi->capt_xrun() > 0 || _pcmi->play_xrun() > 0)) {
1779 fprintf(stderr, "ALSA x-run read: %.2f ms, write: %.2f ms\n",
1780 _pcmi->capt_xrun() * 1000.0, _pcmi->play_xrun() * 1000.0);
1786 // zero audio input buffers
1787 for (std::vector<AlsaPort*>::const_iterator it = _system_inputs.begin (); it != _system_inputs.end (); ++it) {
1788 memset ((*it)->get_buffer (_samples_per_period), 0, _samples_per_period * sizeof (Sample));
1791 clock1 = g_get_monotonic_time();
1793 for (std::vector<AlsaPort*>::const_iterator it = _system_midi_in.begin (); it != _system_midi_in.end (); ++it, ++i) {
1794 static_cast<AlsaMidiBuffer*>((*it)->get_buffer(0))->clear ();
1795 AlsaMidiIn *rm = _rmidi_in.at(i);
1796 void *bptr = (*it)->get_buffer(0);
1797 midi_clear(bptr); // zero midi buffer
1799 // TODO add an API call for this.
1801 uint8_t data[64]; // match MaxAlsaEventSize in alsa_rawmidi.cc
1802 size_t size = sizeof(data);
1803 while (rm->recv_event (time, data, size)) {
1804 ; // discard midi-data from HW.
1806 rm->sync_time (clock1);
1809 _last_process_start = 0;
1810 if (engine.process_callback (_samples_per_period)) {
1816 // drop all outgoing MIDI messages
1817 for (std::vector<AlsaPort*>::const_iterator it = _system_midi_out.begin (); it != _system_midi_out.end (); ++it) {
1818 void *bptr = (*it)->get_buffer(0);
1823 Glib::usleep (100); // don't hog cpu
1826 bool connections_changed = false;
1827 bool ports_changed = false;
1828 if (!pthread_mutex_trylock (&_port_callback_mutex)) {
1829 if (_port_change_flag) {
1830 ports_changed = true;
1831 _port_change_flag = false;
1833 if (!_port_connection_queue.empty ()) {
1834 connections_changed = true;
1836 while (!_port_connection_queue.empty ()) {
1837 PortConnectData *c = _port_connection_queue.back ();
1838 manager.connect_callback (c->a, c->b, c->c);
1839 _port_connection_queue.pop_back ();
1842 pthread_mutex_unlock (&_port_callback_mutex);
1844 if (ports_changed) {
1845 manager.registration_callback();
1847 if (connections_changed) {
1848 manager.graph_order_callback();
1850 if (connections_changed || ports_changed) {
1851 engine.latency_callback(false);
1852 engine.latency_callback(true);
1859 engine.halted_callback("ALSA I/O error.");
1865 /******************************************************************************/
1867 static boost::shared_ptr<AlsaAudioBackend> _instance;
1869 static boost::shared_ptr<AudioBackend> backend_factory (AudioEngine& e);
1870 static int instantiate (const std::string& arg1, const std::string& /* arg2 */);
1871 static int deinstantiate ();
1872 static bool already_configured ();
1873 static bool available ();
1875 static ARDOUR::AudioBackendInfo _descriptor = {
1884 static boost::shared_ptr<AudioBackend>
1885 backend_factory (AudioEngine& e)
1888 _instance.reset (new AlsaAudioBackend (e, _descriptor));
1894 instantiate (const std::string& arg1, const std::string& /* arg2 */)
1896 s_instance_name = arg1;
1908 already_configured ()
1919 extern "C" ARDOURBACKEND_API ARDOUR::AudioBackendInfo* descriptor ()
1921 return &_descriptor;
1925 /******************************************************************************/
1926 AlsaPort::AlsaPort (AlsaAudioBackend &b, const std::string& name, PortFlags flags)
1931 _capture_latency_range.min = 0;
1932 _capture_latency_range.max = 0;
1933 _playback_latency_range.min = 0;
1934 _playback_latency_range.max = 0;
1937 AlsaPort::~AlsaPort () {
1942 int AlsaPort::connect (AlsaPort *port)
1945 PBD::error << _("AlsaPort::connect (): invalid (null) port") << endmsg;
1949 if (type () != port->type ()) {
1950 PBD::error << _("AlsaPort::connect (): wrong port-type") << endmsg;
1954 if (is_output () && port->is_output ()) {
1955 PBD::error << _("AlsaPort::connect (): cannot inter-connect output ports.") << endmsg;
1959 if (is_input () && port->is_input ()) {
1960 PBD::error << _("AlsaPort::connect (): cannot inter-connect input ports.") << endmsg;
1965 PBD::error << _("AlsaPort::connect (): cannot self-connect ports.") << endmsg;
1969 if (is_connected (port)) {
1970 #if 0 // don't bother to warn about this for now. just ignore it
1971 PBD::error << _("AlsaPort::connect (): ports are already connected:")
1972 << " (" << name () << ") -> (" << port->name () << ")"
1978 _connect (port, true);
1983 void AlsaPort::_connect (AlsaPort *port, bool callback)
1985 _connections.push_back (port);
1987 port->_connect (this, false);
1988 _alsa_backend.port_connect_callback (name(), port->name(), true);
1992 int AlsaPort::disconnect (AlsaPort *port)
1995 PBD::error << _("AlsaPort::disconnect (): invalid (null) port") << endmsg;
1999 if (!is_connected (port)) {
2000 PBD::error << _("AlsaPort::disconnect (): ports are not connected:")
2001 << " (" << name () << ") -> (" << port->name () << ")"
2005 _disconnect (port, true);
2009 void AlsaPort::_disconnect (AlsaPort *port, bool callback)
2011 std::vector<AlsaPort*>::iterator it = std::find (_connections.begin (), _connections.end (), port);
2013 assert (it != _connections.end ());
2015 _connections.erase (it);
2018 port->_disconnect (this, false);
2019 _alsa_backend.port_connect_callback (name(), port->name(), false);
2024 void AlsaPort::disconnect_all ()
2026 while (!_connections.empty ()) {
2027 _connections.back ()->_disconnect (this, false);
2028 _alsa_backend.port_connect_callback (name(), _connections.back ()->name(), false);
2029 _connections.pop_back ();
2034 AlsaPort::is_connected (const AlsaPort *port) const
2036 return std::find (_connections.begin (), _connections.end (), port) != _connections.end ();
2039 bool AlsaPort::is_physically_connected () const
2041 for (std::vector<AlsaPort*>::const_iterator it = _connections.begin (); it != _connections.end (); ++it) {
2042 if ((*it)->is_physical ()) {
2049 /******************************************************************************/
2051 AlsaAudioPort::AlsaAudioPort (AlsaAudioBackend &b, const std::string& name, PortFlags flags)
2052 : AlsaPort (b, name, flags)
2054 memset (_buffer, 0, sizeof (_buffer));
2055 mlock(_buffer, sizeof (_buffer));
2058 AlsaAudioPort::~AlsaAudioPort () { }
2060 void* AlsaAudioPort::get_buffer (pframes_t n_samples)
2063 std::vector<AlsaPort*>::const_iterator it = get_connections ().begin ();
2064 if (it == get_connections ().end ()) {
2065 memset (_buffer, 0, n_samples * sizeof (Sample));
2067 AlsaAudioPort const * source = static_cast<const AlsaAudioPort*>(*it);
2068 assert (source && source->is_output ());
2069 memcpy (_buffer, source->const_buffer (), n_samples * sizeof (Sample));
2070 while (++it != get_connections ().end ()) {
2071 source = static_cast<const AlsaAudioPort*>(*it);
2072 assert (source && source->is_output ());
2073 Sample* dst = buffer ();
2074 const Sample* src = source->const_buffer ();
2075 for (uint32_t s = 0; s < n_samples; ++s, ++dst, ++src) {
2085 AlsaMidiPort::AlsaMidiPort (AlsaAudioBackend &b, const std::string& name, PortFlags flags)
2086 : AlsaPort (b, name, flags)
2090 _buffer[0].clear ();
2091 _buffer[1].clear ();
2094 AlsaMidiPort::~AlsaMidiPort () { }
2096 struct MidiEventSorter {
2097 bool operator() (const boost::shared_ptr<AlsaMidiEvent>& a, const boost::shared_ptr<AlsaMidiEvent>& b) {
2102 void* AlsaMidiPort::get_buffer (pframes_t /* nframes */)
2105 (_buffer[_bufperiod]).clear ();
2106 for (std::vector<AlsaPort*>::const_iterator i = get_connections ().begin ();
2107 i != get_connections ().end ();
2109 const AlsaMidiBuffer * src = static_cast<const AlsaMidiPort*>(*i)->const_buffer ();
2110 for (AlsaMidiBuffer::const_iterator it = src->begin (); it != src->end (); ++it) {
2111 (_buffer[_bufperiod]).push_back (boost::shared_ptr<AlsaMidiEvent>(new AlsaMidiEvent (**it)));
2114 std::sort ((_buffer[_bufperiod]).begin (), (_buffer[_bufperiod]).end (), MidiEventSorter());
2116 return &(_buffer[_bufperiod]);
2119 AlsaMidiEvent::AlsaMidiEvent (const pframes_t timestamp, const uint8_t* data, size_t size)
2121 , _timestamp (timestamp)
2125 _data = (uint8_t*) malloc (size);
2126 memcpy (_data, data, size);
2130 AlsaMidiEvent::AlsaMidiEvent (const AlsaMidiEvent& other)
2131 : _size (other.size ())
2132 , _timestamp (other.timestamp ())
2135 if (other.size () && other.const_data ()) {
2136 _data = (uint8_t*) malloc (other.size ());
2137 memcpy (_data, other.const_data (), other.size ());
2141 AlsaMidiEvent::~AlsaMidiEvent () {