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 <boost/foreach.hpp>
27 #include <boost/tokenizer.hpp>
29 #include "alsa_audiobackend.h"
31 #include "pbd/compose.h"
32 #include "pbd/convert.h"
33 #include "pbd/error.h"
34 #include "pbd/file_utils.h"
35 #include "pbd/pthread_utils.h"
37 #include "ardour/filesystem_paths.h"
38 #include "ardour/port_manager.h"
39 #include "ardouralsautil/devicelist.h"
42 using namespace ARDOUR;
44 static std::string s_instance_name;
45 size_t AlsaAudioBackend::_max_buffer_size = 8192;
46 std::vector<std::string> AlsaAudioBackend::_midi_options;
47 std::vector<AudioBackend::DeviceStatus> AlsaAudioBackend::_input_audio_device_status;
48 std::vector<AudioBackend::DeviceStatus> AlsaAudioBackend::_output_audio_device_status;
49 std::vector<AudioBackend::DeviceStatus> AlsaAudioBackend::_duplex_audio_device_status;
50 std::vector<AudioBackend::DeviceStatus> AlsaAudioBackend::_midi_device_status;
52 ALSADeviceInfo AlsaAudioBackend::_input_audio_device_info;
53 ALSADeviceInfo AlsaAudioBackend::_output_audio_device_info;
55 AlsaAudioBackend::AlsaAudioBackend (AudioEngine& e, AudioBackendInfo& info)
56 : AudioBackend (e, info)
61 , _freewheeling (false)
62 , _measure_latency (false)
63 , _last_process_start (0)
64 , _input_audio_device("")
65 , _output_audio_device("")
66 , _midi_driver_option(get_standard_device_name(DeviceNone))
68 , _samples_per_period (1024)
69 , _periods_per_cycle (2)
72 , _systemic_audio_input_latency (0)
73 , _systemic_audio_output_latency (0)
75 , _processed_samples (0)
78 , _port_change_flag (false)
80 _instance_name = s_instance_name;
81 pthread_mutex_init (&_port_callback_mutex, 0);
82 _input_audio_device_info.valid = false;
83 _output_audio_device_info.valid = false;
85 _port_connection_queue.reserve (128);
88 AlsaAudioBackend::~AlsaAudioBackend ()
90 pthread_mutex_destroy (&_port_callback_mutex);
93 /* AUDIOBACKEND API */
96 AlsaAudioBackend::name () const
102 AlsaAudioBackend::is_realtime () const
107 std::vector<AudioBackend::DeviceStatus>
108 AlsaAudioBackend::enumerate_devices () const
110 _duplex_audio_device_status.clear();
111 std::map<std::string, std::string> devices;
112 get_alsa_audio_device_names(devices);
113 for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
114 if (_input_audio_device == "") _input_audio_device = i->first;
115 if (_output_audio_device == "") _output_audio_device = i->first;
116 _duplex_audio_device_status.push_back (DeviceStatus (i->first, true));
118 return _duplex_audio_device_status;
121 std::vector<AudioBackend::DeviceStatus>
122 AlsaAudioBackend::enumerate_input_devices () const
124 _input_audio_device_status.clear();
125 std::map<std::string, std::string> devices;
126 get_alsa_audio_device_names(devices, HalfDuplexIn);
127 _input_audio_device_status.push_back (DeviceStatus (get_standard_device_name(DeviceNone), true));
128 for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
129 if (_input_audio_device == "") _input_audio_device = i->first;
130 _input_audio_device_status.push_back (DeviceStatus (i->first, true));
132 return _input_audio_device_status;
135 std::vector<AudioBackend::DeviceStatus>
136 AlsaAudioBackend::enumerate_output_devices () const
138 _output_audio_device_status.clear();
139 std::map<std::string, std::string> devices;
140 get_alsa_audio_device_names(devices, HalfDuplexOut);
141 _output_audio_device_status.push_back (DeviceStatus (get_standard_device_name(DeviceNone), true));
142 for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
143 if (_output_audio_device == "") _output_audio_device = i->first;
144 _output_audio_device_status.push_back (DeviceStatus (i->first, true));
146 return _output_audio_device_status;
150 AlsaAudioBackend::available_sample_rates2 (const std::string& input_device, const std::string& output_device) const
152 std::vector<float> sr;
153 if (input_device == get_standard_device_name(DeviceNone) && output_device == get_standard_device_name(DeviceNone)) {
156 else if (input_device == get_standard_device_name(DeviceNone)) {
157 sr = available_sample_rates (output_device);
159 else if (output_device == get_standard_device_name(DeviceNone)) {
160 sr = available_sample_rates (input_device);
162 std::vector<float> sr_in = available_sample_rates (input_device);
163 std::vector<float> sr_out = available_sample_rates (output_device);
164 std::set_intersection (sr_in.begin(), sr_in.end(), sr_out.begin(), sr_out.end(), std::back_inserter(sr));
170 AlsaAudioBackend::available_sample_rates (const std::string& device) const
172 ALSADeviceInfo *nfo = NULL;
173 std::vector<float> sr;
174 if (device == get_standard_device_name(DeviceNone)) {
177 if (device == _input_audio_device && _input_audio_device_info.valid) {
178 nfo = &_input_audio_device_info;
180 else if (device == _output_audio_device && _output_audio_device_info.valid) {
181 nfo = &_output_audio_device_info;
184 static const float avail_rates [] = { 8000, 22050.0, 24000.0, 44100.0, 48000.0, 88200.0, 96000.0, 176400.0, 192000.0 };
186 for (size_t i = 0 ; i < sizeof(avail_rates) / sizeof(float); ++i) {
187 if (!nfo || (avail_rates[i] >= nfo->min_rate && avail_rates[i] <= nfo->max_rate)) {
188 sr.push_back (avail_rates[i]);
195 std::vector<uint32_t>
196 AlsaAudioBackend::available_buffer_sizes2 (const std::string& input_device, const std::string& output_device) const
198 std::vector<uint32_t> bs;
199 if (input_device == get_standard_device_name(DeviceNone) && output_device == get_standard_device_name(DeviceNone)) {
202 else if (input_device == get_standard_device_name(DeviceNone)) {
203 bs = available_buffer_sizes (output_device);
205 else if (output_device == get_standard_device_name(DeviceNone)) {
206 bs = available_buffer_sizes (input_device);
208 std::vector<uint32_t> bs_in = available_buffer_sizes (input_device);
209 std::vector<uint32_t> bs_out = available_buffer_sizes (output_device);
210 std::set_intersection (bs_in.begin(), bs_in.end(), bs_out.begin(), bs_out.end(), std::back_inserter(bs));
215 std::vector<uint32_t>
216 AlsaAudioBackend::available_buffer_sizes (const std::string& device) const
218 ALSADeviceInfo *nfo = NULL;
219 std::vector<uint32_t> bs;
220 if (device == get_standard_device_name(DeviceNone)) {
223 if (device == _input_audio_device && _input_audio_device_info.valid) {
224 nfo = &_input_audio_device_info;
226 else if (device == _output_audio_device && _output_audio_device_info.valid) {
227 nfo = &_output_audio_device_info;
230 static const unsigned long avail_sizes [] = { 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192 };
232 for (size_t i = 0 ; i < sizeof(avail_sizes) / sizeof(unsigned long); ++i) {
233 if (!nfo || (avail_sizes[i] >= nfo->min_size && avail_sizes[i] <= nfo->max_size)) {
234 bs.push_back (avail_sizes[i]);
241 AlsaAudioBackend::available_input_channel_count (const std::string& device) const
243 if (device == get_standard_device_name(DeviceNone)) {
246 if (device == _input_audio_device && _input_audio_device_info.valid) {
247 return _input_audio_device_info.max_channels;
253 AlsaAudioBackend::available_output_channel_count (const std::string& device) const
255 if (device == get_standard_device_name(DeviceNone)) {
258 if (device == _output_audio_device && _output_audio_device_info.valid) {
259 return _output_audio_device_info.max_channels;
264 std::vector<uint32_t>
265 AlsaAudioBackend::available_period_sizes (const std::string& driver) const
267 std::vector<uint32_t> ps;
274 AlsaAudioBackend::can_change_sample_rate_when_running () const
280 AlsaAudioBackend::can_change_buffer_size_when_running () const
282 return false; // why not? :)
286 AlsaAudioBackend::set_input_device_name (const std::string& d)
288 if (_input_audio_device == d) {
291 _input_audio_device = d;
293 if (d == get_standard_device_name(DeviceNone)) {
294 _input_audio_device_info.valid = false;
297 std::string alsa_device;
298 std::map<std::string, std::string> devices;
300 get_alsa_audio_device_names(devices, HalfDuplexIn);
301 for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
303 alsa_device = i->second;
307 if (alsa_device == "") {
308 _input_audio_device_info.valid = false;
311 /* device will be busy once used, hence cache the parameters */
312 /* return */ get_alsa_device_parameters (alsa_device.c_str(), true, &_input_audio_device_info);
317 AlsaAudioBackend::set_output_device_name (const std::string& d)
319 if (_output_audio_device == d) {
323 _output_audio_device = d;
325 if (d == get_standard_device_name(DeviceNone)) {
326 _output_audio_device_info.valid = false;
329 std::string alsa_device;
330 std::map<std::string, std::string> devices;
332 get_alsa_audio_device_names(devices, HalfDuplexOut);
333 for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
335 alsa_device = i->second;
339 if (alsa_device == "") {
340 _output_audio_device_info.valid = false;
343 /* return */ get_alsa_device_parameters (alsa_device.c_str(), true, &_output_audio_device_info);
348 AlsaAudioBackend::set_device_name (const std::string& d)
351 rv |= set_input_device_name (d);
352 rv |= set_output_device_name (d);
357 AlsaAudioBackend::set_sample_rate (float sr)
359 if (sr <= 0) { return -1; }
361 engine.sample_rate_change (sr);
366 AlsaAudioBackend::set_peridod_size (uint32_t n)
368 if (n == 0 || n > 3) {
374 _periods_per_cycle = n;
379 AlsaAudioBackend::set_buffer_size (uint32_t bs)
381 if (bs <= 0 || bs >= _max_buffer_size) {
387 _samples_per_period = bs;
388 engine.buffer_size_change (bs);
393 AlsaAudioBackend::set_interleaved (bool yn)
395 if (!yn) { return 0; }
400 AlsaAudioBackend::set_input_channels (uint32_t cc)
407 AlsaAudioBackend::set_output_channels (uint32_t cc)
414 AlsaAudioBackend::set_systemic_input_latency (uint32_t sl)
416 _systemic_audio_input_latency = sl;
418 update_systemic_audio_latencies();
424 AlsaAudioBackend::set_systemic_output_latency (uint32_t sl)
426 _systemic_audio_output_latency = sl;
428 update_systemic_audio_latencies();
434 AlsaAudioBackend::set_systemic_midi_input_latency (std::string const device, uint32_t sl)
436 struct AlsaMidiDeviceInfo * nfo = midi_device_info(device);
438 nfo->systemic_input_latency = sl;
439 if (_run && nfo->enabled) {
440 update_systemic_midi_latencies ();
446 AlsaAudioBackend::set_systemic_midi_output_latency (std::string const device, uint32_t sl)
448 struct AlsaMidiDeviceInfo * nfo = midi_device_info(device);
450 nfo->systemic_output_latency = sl;
451 if (_run && nfo->enabled) {
452 update_systemic_midi_latencies ();
458 AlsaAudioBackend::update_systemic_audio_latencies ()
460 const uint32_t lcpp = (_periods_per_cycle - 2) * _samples_per_period;
463 lr.min = lr.max = lcpp + (_measure_latency ? 0 : _systemic_audio_input_latency);
464 for (std::vector<AlsaPort*>::const_iterator it = _system_outputs.begin (); it != _system_outputs.end (); ++it) {
465 set_latency_range (*it, true, lr);
468 lr.min = lr.max = (_measure_latency ? 0 : _systemic_audio_output_latency);
469 for (std::vector<AlsaPort*>::const_iterator it = _system_inputs.begin (); it != _system_inputs.end (); ++it) {
470 set_latency_range (*it, false, lr);
476 AlsaAudioBackend::update_systemic_midi_latencies ()
479 for (std::vector<AlsaPort*>::iterator it = _system_midi_out.begin (); it != _system_midi_out.end (); ++it, ++i) {
480 assert (_rmidi_out.size() > i);
481 AlsaMidiOut *rm = _rmidi_out.at(i);
482 struct AlsaMidiDeviceInfo * nfo = midi_device_info (rm->name());
485 lr.min = lr.max = (_measure_latency ? 0 : nfo->systemic_output_latency);
486 set_latency_range (*it, false, lr);
490 for (std::vector<AlsaPort*>::const_iterator it = _system_midi_in.begin (); it != _system_midi_in.end (); ++it, ++i) {
491 assert (_rmidi_in.size() > i);
492 AlsaMidiIO *rm = _rmidi_in.at(i);
493 struct AlsaMidiDeviceInfo * nfo = midi_device_info (rm->name());
496 lr.min = lr.max = (_measure_latency ? 0 : nfo->systemic_input_latency);
497 set_latency_range (*it, true, lr);
502 /* Retrieving parameters */
504 AlsaAudioBackend::device_name () const
506 if (_input_audio_device != get_standard_device_name(DeviceNone)) {
507 return _input_audio_device;
509 if (_output_audio_device != get_standard_device_name(DeviceNone)) {
510 return _output_audio_device;
516 AlsaAudioBackend::input_device_name () const
518 return _input_audio_device;
522 AlsaAudioBackend::output_device_name () const
524 return _output_audio_device;
528 AlsaAudioBackend::sample_rate () const
534 AlsaAudioBackend::buffer_size () const
536 return _samples_per_period;
540 AlsaAudioBackend::period_size () const
542 return _periods_per_cycle;
546 AlsaAudioBackend::interleaved () const
552 AlsaAudioBackend::input_channels () const
558 AlsaAudioBackend::output_channels () const
564 AlsaAudioBackend::systemic_input_latency () const
566 return _systemic_audio_input_latency;
570 AlsaAudioBackend::systemic_output_latency () const
572 return _systemic_audio_output_latency;
576 AlsaAudioBackend::systemic_midi_input_latency (std::string const device) const
578 struct AlsaMidiDeviceInfo * nfo = midi_device_info(device);
580 return nfo->systemic_input_latency;
584 AlsaAudioBackend::systemic_midi_output_latency (std::string const device) const
586 struct AlsaMidiDeviceInfo * nfo = midi_device_info(device);
588 return nfo->systemic_output_latency;
592 struct AlsaAudioBackend::AlsaMidiDeviceInfo *
593 AlsaAudioBackend::midi_device_info(std::string const name) const {
594 for (std::map<std::string, struct AlsaMidiDeviceInfo*>::const_iterator i = _midi_devices.begin (); i != _midi_devices.end(); ++i) {
595 if (i->first == name) {
600 assert(_midi_driver_option != get_standard_device_name(DeviceNone));
602 std::map<std::string, std::string> devices;
603 if (_midi_driver_option == _("ALSA raw devices")) {
604 get_alsa_rawmidi_device_names(devices);
606 get_alsa_sequencer_names (devices);
609 for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
610 if (i->first == name) {
611 _midi_devices[name] = new AlsaMidiDeviceInfo();
612 return _midi_devices[name];
618 std::vector<std::string>
619 AlsaAudioBackend::enumerate_midi_options () const
621 if (_midi_options.empty()) {
622 _midi_options.push_back (_("ALSA raw devices"));
623 _midi_options.push_back (_("ALSA sequencer"));
624 _midi_options.push_back (get_standard_device_name(DeviceNone));
626 return _midi_options;
629 std::vector<AudioBackend::DeviceStatus>
630 AlsaAudioBackend::enumerate_midi_devices () const
632 _midi_device_status.clear();
633 std::map<std::string, std::string> devices;
635 if (_midi_driver_option == _("ALSA raw devices")) {
636 get_alsa_rawmidi_device_names (devices);
638 else if (_midi_driver_option == _("ALSA sequencer")) {
639 get_alsa_sequencer_names (devices);
642 for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
643 _midi_device_status.push_back (DeviceStatus (i->first, true));
645 return _midi_device_status;
649 AlsaAudioBackend::set_midi_option (const std::string& opt)
651 if (opt != get_standard_device_name(DeviceNone) && opt != _("ALSA raw devices") && opt != _("ALSA sequencer")) {
654 if (_run && _midi_driver_option != opt) {
657 _midi_driver_option = opt;
662 AlsaAudioBackend::midi_option () const
664 return _midi_driver_option;
668 AlsaAudioBackend::set_midi_device_enabled (std::string const device, bool enable)
670 struct AlsaMidiDeviceInfo * nfo = midi_device_info(device);
672 const bool prev_enabled = nfo->enabled;
673 nfo->enabled = enable;
675 if (_run && prev_enabled != enable) {
676 // XXX actually we should not change system-ports while running,
677 // because iterators in main_process_thread will become invalid.
679 // Luckily the engine dialog does not call this while the engine is running,
680 // This code is currently not used.
682 // add ports for the given device
683 register_system_midi_ports(device);
685 // remove all ports provided by the given device
687 for (std::vector<AlsaPort*>::iterator it = _system_midi_out.begin (); it != _system_midi_out.end ();) {
688 assert (_rmidi_out.size() > i);
689 AlsaMidiOut *rm = _rmidi_out.at(i);
690 if (rm->name () != device) { ++it; ++i; continue; }
691 it = _system_midi_out.erase (it);
692 unregister_port (*it);
694 _rmidi_out.erase (_rmidi_out.begin() + i);
699 for (std::vector<AlsaPort*>::iterator it = _system_midi_in.begin (); it != _system_midi_in.end ();) {
700 assert (_rmidi_in.size() > i);
701 AlsaMidiIn *rm = _rmidi_in.at(i);
702 if (rm->name () != device) { ++it; ++i; continue; }
703 it = _system_midi_in.erase (it);
704 unregister_port (*it);
706 _rmidi_in.erase (_rmidi_in.begin() + i);
710 update_systemic_midi_latencies ();
716 AlsaAudioBackend::midi_device_enabled (std::string const device) const
718 struct AlsaMidiDeviceInfo * nfo = midi_device_info(device);
719 if (!nfo) return false;
725 static void * pthread_process (void *arg)
727 AlsaAudioBackend *d = static_cast<AlsaAudioBackend *>(arg);
728 d->main_process_thread ();
734 AlsaAudioBackend::_start (bool for_latency_measurement)
736 if (!_active && _run) {
737 // recover from 'halted', reap threads
741 if (_active || _run) {
742 if (for_latency_measurement != _measure_latency) {
743 _measure_latency = for_latency_measurement;
744 update_systemic_audio_latencies();
745 update_systemic_midi_latencies ();
746 PBD::info << _("AlsaAudioBackend: reload latencies.") << endmsg;
749 PBD::info << _("AlsaAudioBackend: already active.") << endmsg;
750 return BackendReinitializationError;
753 if (_ports.size () || _portmap.size ()) {
754 PBD::warning << _("AlsaAudioBackend: recovering from unclean shutdown, port registry is not empty.") << endmsg;
755 _system_inputs.clear();
756 _system_outputs.clear();
757 _system_midi_in.clear();
758 _system_midi_out.clear();
763 /* reset internal state */
765 _freewheeling = false;
767 _last_process_start = 0;
769 _device_reservation.release_device();
771 assert(_rmidi_in.size() == 0);
772 assert(_rmidi_out.size() == 0);
776 std::string audio_device;
777 std::string alsa_device;
778 std::map<std::string, std::string> devices;
780 if (_input_audio_device == get_standard_device_name(DeviceNone) && _output_audio_device == get_standard_device_name(DeviceNone)) {
781 PBD::error << _("AlsaAudioBackend: At least one of input or output device needs to be set.");
782 return AudioDeviceInvalidError;
785 if (_input_audio_device != _output_audio_device) {
786 if (_input_audio_device != get_standard_device_name(DeviceNone) && _output_audio_device != get_standard_device_name(DeviceNone)) {
787 PBD::error << _("AlsaAudioBackend: Cannot use two different devices.");
788 return AudioDeviceInvalidError;
790 if (_input_audio_device != get_standard_device_name(DeviceNone)) {
791 get_alsa_audio_device_names(devices, HalfDuplexIn);
792 audio_device = _input_audio_device;
795 get_alsa_audio_device_names(devices, HalfDuplexOut);
796 audio_device = _output_audio_device;
800 get_alsa_audio_device_names(devices);
801 audio_device = _input_audio_device;
805 for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
806 if (i->first == audio_device) {
807 alsa_device = i->second;
811 if (alsa_device == "") {
812 PBD::error << _("AlsaAudioBackend: Cannot find configured device. Is it still connected?");
813 return AudioDeviceNotAvailableError;
816 _device_reservation.acquire_device(alsa_device.c_str());
817 _pcmi = new Alsa_pcmi (
818 (duplex & 2) ? alsa_device.c_str() : NULL,
819 (duplex & 1) ? alsa_device.c_str() : NULL,
821 _samplerate, _samples_per_period,
822 _periods_per_cycle, /* _periods_per_cycle */ 2,
825 AudioBackend::ErrorCode error_code = NoError;
826 switch (_pcmi->state()) {
830 PBD::error << _("AlsaAudioBackend: failed to open device.") << endmsg;
831 error_code = AudioDeviceOpenError;
834 PBD::error << _("AlsaAudioBackend: failed to allocate parameters.") << endmsg;
835 error_code = AudioDeviceOpenError;
838 PBD::error << _("AlsaAudioBackend: cannot set requested sample rate.")
840 error_code = SampleRateNotSupportedError;
843 PBD::error << _("AlsaAudioBackend: cannot set requested period size.")
845 error_code = PeriodSizeNotSupportedError;
848 PBD::error << _("AlsaAudioBackend: cannot set requested number of periods.")
850 error_code = PeriodCountNotSupportedError;
853 PBD::error << _("AlsaAudioBackend: unsupported sample format.") << endmsg;
854 error_code = SampleFormatNotSupportedError;
857 PBD::error << _("AlsaAudioBackend: initialization failed.") << endmsg;
858 error_code = AudioDeviceOpenError;
862 if (_pcmi->state ()) {
863 delete _pcmi; _pcmi = 0;
864 _device_reservation.release_device();
872 if (_n_outputs != _pcmi->nplay ()) {
873 if (_n_outputs == 0) {
874 _n_outputs = _pcmi->nplay ();
876 _n_outputs = std::min (_n_outputs, _pcmi->nplay ());
878 PBD::warning << _("AlsaAudioBackend: adjusted output channel count to match device.") << endmsg;
881 if (_n_inputs != _pcmi->ncapt ()) {
882 if (_n_inputs == 0) {
883 _n_inputs = _pcmi->ncapt ();
885 _n_inputs = std::min (_n_inputs, _pcmi->ncapt ());
887 PBD::warning << _("AlsaAudioBackend: adjusted input channel count to match device.") << endmsg;
890 if (_pcmi->fsize() != _samples_per_period) {
891 _samples_per_period = _pcmi->fsize();
892 PBD::warning << _("AlsaAudioBackend: samples per period does not match.") << endmsg;
895 if (_pcmi->fsamp() != _samplerate) {
896 _samplerate = _pcmi->fsamp();
897 engine.sample_rate_change (_samplerate);
898 PBD::warning << _("AlsaAudioBackend: sample rate does not match.") << endmsg;
901 _measure_latency = for_latency_measurement;
903 _midi_ins = _midi_outs = 0;
904 register_system_midi_ports();
906 if (register_system_audio_ports()) {
907 PBD::error << _("AlsaAudioBackend: failed to register system ports.") << endmsg;
908 delete _pcmi; _pcmi = 0;
909 _device_reservation.release_device();
910 return PortRegistrationError;
913 engine.sample_rate_change (_samplerate);
914 engine.buffer_size_change (_samples_per_period);
916 if (engine.reestablish_ports ()) {
917 PBD::error << _("AlsaAudioBackend: Could not re-establish ports.") << endmsg;
918 delete _pcmi; _pcmi = 0;
919 _device_reservation.release_device();
920 return PortReconnectError;
923 engine.reconnect_ports ();
925 _port_change_flag = false;
927 if (pbd_realtime_pthread_create (PBD_SCHED_FIFO, -20, 100000,
928 &_main_thread, pthread_process, this))
930 if (pthread_create (&_main_thread, NULL, pthread_process, this))
932 PBD::error << _("AlsaAudioBackend: failed to create process thread.") << endmsg;
933 delete _pcmi; _pcmi = 0;
934 _device_reservation.release_device();
936 return ProcessThreadStartError;
938 PBD::warning << _("AlsaAudioBackend: cannot acquire realtime permissions.") << endmsg;
943 while (!_active && --timeout > 0) { Glib::usleep (1000); }
945 if (timeout == 0 || !_active) {
946 PBD::error << _("AlsaAudioBackend: failed to start process thread.") << endmsg;
947 delete _pcmi; _pcmi = 0;
948 _device_reservation.release_device();
950 return ProcessThreadStartError;
954 if (NULL != getenv ("ALSAEXT")) {
955 boost::char_separator<char> sep (";");
956 boost::tokenizer<boost::char_separator<char> > devs (std::string(getenv ("ALSAEXT")), sep);
957 BOOST_FOREACH (const std::string& tmp, devs) {
958 std::string dev (tmp);
959 std::string::size_type n = dev.find ('@');
960 unsigned int sr = _samplerate;
961 unsigned int spp = _samples_per_period;
962 unsigned int duplex = 3; // TODO parse 1: play, 2: capt, 3:both
963 if (n != std::string::npos) {
964 std::string opt (dev.substr (n + 1));
965 sr = PBD::atoi (opt);
966 dev = dev.substr (0, n);
967 std::string::size_type n = opt.find ('/');
968 if (n != std::string::npos) {
969 spp = PBD::atoi (opt.substr (n + 1));
972 if (add_slave (dev.c_str(), sr, spp, duplex)) {
973 PBD::info << string_compose (_("ALSA slave '%1' added"), dev) << endmsg;
975 PBD::error << string_compose (_("ALSA failed to add '%1' as slave"), dev) << endmsg;
985 AlsaAudioBackend::stop ()
993 if (pthread_join (_main_thread, &status)) {
994 PBD::error << _("AlsaAudioBackend: failed to terminate.") << endmsg;
998 while (!_rmidi_out.empty ()) {
999 AlsaMidiIO *m = _rmidi_out.back ();
1001 _rmidi_out.pop_back ();
1004 while (!_rmidi_in.empty ()) {
1005 AlsaMidiIO *m = _rmidi_in.back ();
1007 _rmidi_in.pop_back ();
1011 while (!_slaves.empty ()) {
1012 AudioSlave* s = _slaves.back ();
1013 _slaves.pop_back ();
1018 delete _pcmi; _pcmi = 0;
1019 _midi_ins = _midi_outs = 0;
1020 _device_reservation.release_device();
1021 _measure_latency = false;
1023 return (_active == false) ? 0 : -1;
1027 AlsaAudioBackend::freewheel (bool onoff)
1029 _freewheeling = onoff;
1034 AlsaAudioBackend::dsp_load () const
1036 return 100.f * _dsp_load;
1040 AlsaAudioBackend::raw_buffer_size (DataType t)
1043 case DataType::AUDIO:
1044 return _samples_per_period * sizeof(Sample);
1045 case DataType::MIDI:
1046 return _max_buffer_size; // XXX not really limited
1053 AlsaAudioBackend::sample_time ()
1055 return _processed_samples;
1059 AlsaAudioBackend::sample_time_at_cycle_start ()
1061 return _processed_samples;
1065 AlsaAudioBackend::samples_since_cycle_start ()
1067 if (!_active || !_run || _freewheeling || _freewheel) {
1070 if (_last_process_start == 0) {
1074 const int64_t elapsed_time_us = g_get_monotonic_time() - _last_process_start;
1075 return std::max((pframes_t)0, (pframes_t)rint(1e-6 * elapsed_time_us * _samplerate));
1080 AlsaAudioBackend::alsa_process_thread (void *arg)
1082 ThreadData* td = reinterpret_cast<ThreadData*> (arg);
1083 boost::function<void ()> f = td->f;
1090 AlsaAudioBackend::create_process_thread (boost::function<void()> func)
1092 pthread_t thread_id;
1093 pthread_attr_t attr;
1094 size_t stacksize = 100000;
1096 ThreadData* td = new ThreadData (this, func, stacksize);
1098 if (pbd_realtime_pthread_create (PBD_SCHED_FIFO, -22, stacksize,
1099 &thread_id, alsa_process_thread, td)) {
1100 pthread_attr_init (&attr);
1101 pthread_attr_setstacksize (&attr, stacksize);
1102 if (pthread_create (&thread_id, &attr, alsa_process_thread, td)) {
1103 PBD::error << _("AudioEngine: cannot create process thread.") << endmsg;
1104 pthread_attr_destroy (&attr);
1107 pthread_attr_destroy (&attr);
1110 _threads.push_back (thread_id);
1115 AlsaAudioBackend::join_process_threads ()
1119 for (std::vector<pthread_t>::const_iterator i = _threads.begin (); i != _threads.end (); ++i)
1122 if (pthread_join (*i, &status)) {
1123 PBD::error << _("AudioEngine: cannot terminate process thread.") << endmsg;
1132 AlsaAudioBackend::in_process_thread ()
1134 if (pthread_equal (_main_thread, pthread_self()) != 0) {
1138 for (std::vector<pthread_t>::const_iterator i = _threads.begin (); i != _threads.end (); ++i)
1140 if (pthread_equal (*i, pthread_self ()) != 0) {
1148 AlsaAudioBackend::process_thread_count ()
1150 return _threads.size ();
1154 AlsaAudioBackend::update_latencies ()
1156 // trigger latency callback in RT thread (locked graph)
1157 port_connect_add_remove_callback();
1160 /* PORTENGINE API */
1163 AlsaAudioBackend::private_handle () const
1169 AlsaAudioBackend::my_name () const
1171 return _instance_name;
1175 AlsaAudioBackend::available () const
1177 return _run && _active;
1181 AlsaAudioBackend::port_name_size () const
1187 AlsaAudioBackend::set_port_name (PortEngine::PortHandle port, const std::string& name)
1189 std::string newname (_instance_name + ":" + name);
1190 if (!valid_port (port)) {
1191 PBD::error << _("AlsaBackend::set_port_name: Invalid Port") << endmsg;
1194 if (find_port (newname)) {
1195 PBD::error << _("AlsaBackend::set_port_name: Port with given name already exists") << endmsg;
1199 AlsaPort* p = static_cast<AlsaPort*>(port);
1200 _portmap.erase (p->name());
1201 _portmap.insert (make_pair (newname, p));
1202 return p->set_name (newname);
1206 AlsaAudioBackend::get_port_name (PortEngine::PortHandle port) const
1208 if (!valid_port (port)) {
1209 PBD::warning << _("AlsaBackend::get_port_name: Invalid Port(s)") << endmsg;
1210 return std::string ();
1212 return static_cast<AlsaPort*>(port)->name ();
1216 AlsaAudioBackend::get_port_property (PortHandle port, const std::string& key, std::string& value, std::string& type) const
1218 if (!valid_port (port)) {
1219 PBD::warning << _("AlsaBackend::get_port_property: Invalid Port(s)") << endmsg;
1222 if (key == "http://jackaudio.org/metadata/pretty-name") {
1224 value = static_cast<AlsaPort*>(port)->pretty_name ();
1225 if (!value.empty()) {
1233 AlsaAudioBackend::set_port_property (PortHandle port, const std::string& key, const std::string& value, const std::string& type)
1235 if (!valid_port (port)) {
1236 PBD::warning << _("AlsaBackend::set_port_property: Invalid Port(s)") << endmsg;
1239 if (key == "http://jackaudio.org/metadata/pretty-name" && type.empty ()) {
1240 static_cast<AlsaPort*>(port)->set_pretty_name (value);
1246 PortEngine::PortHandle
1247 AlsaAudioBackend::get_port_by_name (const std::string& name) const
1249 PortHandle port = (PortHandle) find_port (name);
1254 AlsaAudioBackend::get_ports (
1255 const std::string& port_name_pattern,
1256 DataType type, PortFlags flags,
1257 std::vector<std::string>& port_names) const
1261 bool use_regexp = false;
1262 if (port_name_pattern.size () > 0) {
1263 if (!regcomp (&port_regex, port_name_pattern.c_str (), REG_EXTENDED|REG_NOSUB)) {
1268 for (PortIndex::const_iterator i = _ports.begin (); i != _ports.end (); ++i) {
1269 AlsaPort* port = *i;
1270 if ((port->type () == type) && flags == (port->flags () & flags)) {
1271 if (!use_regexp || !regexec (&port_regex, port->name ().c_str (), 0, NULL, 0)) {
1272 port_names.push_back (port->name ());
1278 regfree (&port_regex);
1284 AlsaAudioBackend::port_data_type (PortEngine::PortHandle port) const
1286 if (!valid_port (port)) {
1287 return DataType::NIL;
1289 return static_cast<AlsaPort*>(port)->type ();
1292 PortEngine::PortHandle
1293 AlsaAudioBackend::register_port (
1294 const std::string& name,
1295 ARDOUR::DataType type,
1296 ARDOUR::PortFlags flags)
1298 if (name.size () == 0) { return 0; }
1299 if (flags & IsPhysical) { return 0; }
1300 return add_port (_instance_name + ":" + name, type, flags);
1303 PortEngine::PortHandle
1304 AlsaAudioBackend::add_port (
1305 const std::string& name,
1306 ARDOUR::DataType type,
1307 ARDOUR::PortFlags flags)
1309 assert(name.size ());
1310 if (find_port (name)) {
1311 PBD::error << _("AlsaBackend::register_port: Port already exists:")
1312 << " (" << name << ")" << endmsg;
1315 AlsaPort* port = NULL;
1317 case DataType::AUDIO:
1318 port = new AlsaAudioPort (*this, name, flags);
1320 case DataType::MIDI:
1321 port = new AlsaMidiPort (*this, name, flags);
1324 PBD::error << _("AlsaBackend::register_port: Invalid Data Type.") << endmsg;
1328 _ports.insert (port);
1329 _portmap.insert (make_pair (name, port));
1335 AlsaAudioBackend::unregister_port (PortEngine::PortHandle port_handle)
1340 AlsaPort* port = static_cast<AlsaPort*>(port_handle);
1341 PortIndex::iterator i = std::find (_ports.begin(), _ports.end(), static_cast<AlsaPort*>(port_handle));
1342 if (i == _ports.end ()) {
1343 PBD::error << _("AlsaBackend::unregister_port: Failed to find port") << endmsg;
1346 disconnect_all(port_handle);
1347 _portmap.erase (port->name());
1353 AlsaAudioBackend::register_system_audio_ports()
1357 const int a_ins = _n_inputs;
1358 const int a_out = _n_outputs;
1360 const uint32_t lcpp = (_periods_per_cycle - 2) * _samples_per_period;
1363 lr.min = lr.max = (_systemic_audio_input_latency);
1364 for (int i = 1; i <= a_ins; ++i) {
1366 snprintf(tmp, sizeof(tmp), "system:capture_%d", i);
1367 PortHandle p = add_port(std::string(tmp), DataType::AUDIO, static_cast<PortFlags>(IsOutput | IsPhysical | IsTerminal));
1369 set_latency_range (p, false, lr);
1370 AlsaPort *ap = static_cast<AlsaPort*>(p);
1371 //ap->set_pretty_name ("")
1372 _system_inputs.push_back (ap);
1375 lr.min = lr.max = lcpp + (_systemic_audio_output_latency);
1376 for (int i = 1; i <= a_out; ++i) {
1378 snprintf(tmp, sizeof(tmp), "system:playback_%d", i);
1379 PortHandle p = add_port(std::string(tmp), DataType::AUDIO, static_cast<PortFlags>(IsInput | IsPhysical | IsTerminal));
1381 set_latency_range (p, true, lr);
1382 AlsaPort *ap = static_cast<AlsaPort*>(p);
1383 //ap->set_pretty_name ("")
1384 _system_outputs.push_back (ap);
1389 /* set playback-latency for _system_inputs
1390 * and capture-latency for _system_outputs
1393 AlsaAudioBackend::update_system_port_latecies ()
1395 for (std::vector<AlsaPort*>::const_iterator it = _system_inputs.begin (); it != _system_inputs.end (); ++it) {
1396 (*it)->update_connected_latency (true);
1398 for (std::vector<AlsaPort*>::const_iterator it = _system_outputs.begin (); it != _system_outputs.end (); ++it) {
1399 (*it)->update_connected_latency (false);
1402 for (std::vector<AlsaPort*>::const_iterator it = _system_midi_in.begin (); it != _system_midi_in.end (); ++it) {
1403 (*it)->update_connected_latency (true);
1405 for (std::vector<AlsaPort*>::const_iterator it = _system_midi_out.begin (); it != _system_midi_out.end (); ++it) {
1406 (*it)->update_connected_latency (false);
1409 for (AudioSlaves::iterator s = _slaves.begin (); s != _slaves.end (); ++s) {
1413 for (std::vector<AlsaPort*>::const_iterator it = (*s)->inputs.begin (); it != (*s)->inputs.end (); ++it) {
1414 (*it)->update_connected_latency (true);
1416 for (std::vector<AlsaPort*>::const_iterator it = (*s)->outputs.begin (); it != (*s)->outputs.end (); ++it) {
1417 (*it)->update_connected_latency (false);
1422 /* libs/ardouralsautil/devicelist.cc appends either of
1423 * " (IO)", " (I)", or " (O)"
1424 * depending of the device is full-duples or half-duplex
1426 static std::string replace_name_io (std::string const& name, bool in)
1428 if (name.empty ()) {
1431 size_t pos = name.find_last_of ('(');
1432 if (pos == std::string::npos) {
1433 assert (0); // this should never happen.
1436 return name.substr (0, pos) + "(" + (in ? "In" : "Out") + ")";
1440 AlsaAudioBackend::register_system_midi_ports(const std::string device)
1442 std::map<std::string, std::string> devices;
1444 // TODO use consistent numbering when re-adding devices: _midi_ins, _midi_outs
1446 if (_midi_driver_option == get_standard_device_name(DeviceNone)) {
1448 } else if (_midi_driver_option == _("ALSA raw devices")) {
1449 get_alsa_rawmidi_device_names(devices);
1451 get_alsa_sequencer_names (devices);
1454 for (std::map<std::string, std::string>::const_iterator i = devices.begin (); i != devices.end(); ++i) {
1455 if (!device.empty() && device != i->first) {
1458 struct AlsaMidiDeviceInfo * nfo = midi_device_info(i->first);
1460 if (!nfo->enabled) continue;
1463 if (_midi_driver_option == _("ALSA raw devices")) {
1464 mout = new AlsaRawMidiOut (i->first, i->second.c_str());
1466 mout = new AlsaSeqMidiOut (i->first, i->second.c_str());
1469 if (mout->state ()) {
1470 PBD::warning << string_compose (
1471 _("AlsaMidiOut: failed to open midi device '%1'."), i->second)
1475 mout->setup_timing(_samples_per_period, _samplerate);
1476 mout->sync_time (g_get_monotonic_time());
1477 if (mout->start ()) {
1478 PBD::warning << string_compose (
1479 _("AlsaMidiOut: failed to start midi device '%1'."), i->second)
1484 snprintf(tmp, sizeof(tmp), "system:midi_playback_%d", ++_midi_ins);
1485 PortHandle p = add_port(std::string(tmp), DataType::MIDI, static_cast<PortFlags>(IsInput | IsPhysical | IsTerminal));
1491 lr.min = lr.max = (nfo->systemic_output_latency);
1492 set_latency_range (p, true, lr);
1493 static_cast<AlsaMidiPort*>(p)->set_n_periods(_periods_per_cycle); // TODO check MIDI alignment
1494 AlsaPort *ap = static_cast<AlsaPort*>(p);
1495 ap->set_pretty_name (replace_name_io (i->first, false));
1496 _system_midi_out.push_back (ap);
1497 _rmidi_out.push_back (mout);
1502 if (_midi_driver_option == _("ALSA raw devices")) {
1503 midin = new AlsaRawMidiIn (i->first, i->second.c_str());
1505 midin = new AlsaSeqMidiIn (i->first, i->second.c_str());
1508 if (midin->state ()) {
1509 PBD::warning << string_compose (
1510 _("AlsaMidiIn: failed to open midi device '%1'."), i->second)
1514 midin->setup_timing(_samples_per_period, _samplerate);
1515 midin->sync_time (g_get_monotonic_time());
1516 if (midin->start ()) {
1517 PBD::warning << string_compose (
1518 _("AlsaMidiIn: failed to start midi device '%1'."), i->second)
1523 snprintf(tmp, sizeof(tmp), "system:midi_capture_%d", ++_midi_outs);
1524 PortHandle p = add_port(std::string(tmp), DataType::MIDI, static_cast<PortFlags>(IsOutput | IsPhysical | IsTerminal));
1531 lr.min = lr.max = (nfo->systemic_input_latency);
1532 set_latency_range (p, false, lr);
1533 AlsaPort *ap = static_cast<AlsaPort*>(p);
1534 ap->set_pretty_name (replace_name_io (i->first, true));
1535 _system_midi_in.push_back (ap);
1536 _rmidi_in.push_back (midin);
1544 AlsaAudioBackend::unregister_ports (bool system_only)
1546 _system_inputs.clear();
1547 _system_outputs.clear();
1548 _system_midi_in.clear();
1549 _system_midi_out.clear();
1551 for (PortIndex::iterator i = _ports.begin (); i != _ports.end ();) {
1552 PortIndex::iterator cur = i++;
1553 AlsaPort* port = *cur;
1554 if (! system_only || (port->is_physical () && port->is_terminal ())) {
1555 port->disconnect_all ();
1556 _portmap.erase (port->name());
1564 AlsaAudioBackend::connect (const std::string& src, const std::string& dst)
1566 AlsaPort* src_port = find_port (src);
1567 AlsaPort* dst_port = find_port (dst);
1570 PBD::error << _("AlsaBackend::connect: Invalid Source port:")
1571 << " (" << src <<")" << endmsg;
1575 PBD::error << _("AlsaBackend::connect: Invalid Destination port:")
1576 << " (" << dst <<")" << endmsg;
1579 return src_port->connect (dst_port);
1583 AlsaAudioBackend::disconnect (const std::string& src, const std::string& dst)
1585 AlsaPort* src_port = find_port (src);
1586 AlsaPort* dst_port = find_port (dst);
1588 if (!src_port || !dst_port) {
1589 PBD::error << _("AlsaBackend::disconnect: Invalid Port(s)") << endmsg;
1592 return src_port->disconnect (dst_port);
1596 AlsaAudioBackend::connect (PortEngine::PortHandle src, const std::string& dst)
1598 AlsaPort* dst_port = find_port (dst);
1599 if (!valid_port (src)) {
1600 PBD::error << _("AlsaBackend::connect: Invalid Source Port Handle") << endmsg;
1604 PBD::error << _("AlsaBackend::connect: Invalid Destination Port")
1605 << " (" << dst << ")" << endmsg;
1608 return static_cast<AlsaPort*>(src)->connect (dst_port);
1612 AlsaAudioBackend::disconnect (PortEngine::PortHandle src, const std::string& dst)
1614 AlsaPort* dst_port = find_port (dst);
1615 if (!valid_port (src) || !dst_port) {
1616 PBD::error << _("AlsaBackend::disconnect: Invalid Port(s)") << endmsg;
1619 return static_cast<AlsaPort*>(src)->disconnect (dst_port);
1623 AlsaAudioBackend::disconnect_all (PortEngine::PortHandle port)
1625 if (!valid_port (port)) {
1626 PBD::error << _("AlsaBackend::disconnect_all: Invalid Port") << endmsg;
1629 static_cast<AlsaPort*>(port)->disconnect_all ();
1634 AlsaAudioBackend::connected (PortEngine::PortHandle port, bool /* process_callback_safe*/)
1636 if (!valid_port (port)) {
1637 PBD::error << _("AlsaBackend::disconnect_all: Invalid Port") << endmsg;
1640 return static_cast<AlsaPort*>(port)->is_connected ();
1644 AlsaAudioBackend::connected_to (PortEngine::PortHandle src, const std::string& dst, bool /*process_callback_safe*/)
1646 AlsaPort* dst_port = find_port (dst);
1648 if (!valid_port (src) || !dst_port) {
1649 PBD::error << _("AlsaBackend::connected_to: Invalid Port") << endmsg;
1653 return static_cast<AlsaPort*>(src)->is_connected (dst_port);
1657 AlsaAudioBackend::physically_connected (PortEngine::PortHandle port, bool /*process_callback_safe*/)
1659 if (!valid_port (port)) {
1660 PBD::error << _("AlsaBackend::physically_connected: Invalid Port") << endmsg;
1663 return static_cast<AlsaPort*>(port)->is_physically_connected ();
1667 AlsaAudioBackend::get_connections (PortEngine::PortHandle port, std::vector<std::string>& names, bool /*process_callback_safe*/)
1669 if (!valid_port (port)) {
1670 PBD::error << _("AlsaBackend::get_connections: Invalid Port") << endmsg;
1674 assert (0 == names.size ());
1676 const std::set<AlsaPort*>& connected_ports = static_cast<AlsaPort*>(port)->get_connections ();
1678 for (std::set<AlsaPort*>::const_iterator i = connected_ports.begin (); i != connected_ports.end (); ++i) {
1679 names.push_back ((*i)->name ());
1682 return (int)names.size ();
1687 AlsaAudioBackend::midi_event_get (
1688 pframes_t& timestamp,
1689 size_t& size, uint8_t const** buf, void* port_buffer,
1690 uint32_t event_index)
1692 assert (buf && port_buffer);
1693 AlsaMidiBuffer& source = * static_cast<AlsaMidiBuffer*>(port_buffer);
1694 if (event_index >= source.size ()) {
1697 AlsaMidiEvent const& event = source[event_index];
1699 timestamp = event.timestamp ();
1700 size = event.size ();
1701 *buf = event.data ();
1706 AlsaAudioBackend::midi_event_put (
1708 pframes_t timestamp,
1709 const uint8_t* buffer, size_t size)
1711 assert (buffer && port_buffer);
1712 if (size >= MaxAlsaMidiEventSize) {
1715 AlsaMidiBuffer& dst = * static_cast<AlsaMidiBuffer*>(port_buffer);
1717 if (dst.size () && (pframes_t)dst.back ().timestamp () > timestamp) {
1718 // nevermind, ::get_buffer() sorts events
1719 fprintf (stderr, "AlsaMidiBuffer: it's too late for this event. %d > %d\n",
1720 (pframes_t)dst.back ().timestamp (), timestamp);
1723 dst.push_back (AlsaMidiEvent (timestamp, buffer, size));
1728 AlsaAudioBackend::get_midi_event_count (void* port_buffer)
1730 assert (port_buffer);
1731 return static_cast<AlsaMidiBuffer*>(port_buffer)->size ();
1735 AlsaAudioBackend::midi_clear (void* port_buffer)
1737 assert (port_buffer);
1738 AlsaMidiBuffer * buf = static_cast<AlsaMidiBuffer*>(port_buffer);
1746 AlsaAudioBackend::can_monitor_input () const
1752 AlsaAudioBackend::request_input_monitoring (PortEngine::PortHandle, bool)
1758 AlsaAudioBackend::ensure_input_monitoring (PortEngine::PortHandle, bool)
1764 AlsaAudioBackend::monitoring_input (PortEngine::PortHandle)
1769 /* Latency management */
1772 AlsaAudioBackend::set_latency_range (PortEngine::PortHandle port, bool for_playback, LatencyRange latency_range)
1774 if (!valid_port (port)) {
1775 PBD::error << _("AlsaPort::set_latency_range (): invalid port.") << endmsg;
1777 static_cast<AlsaPort*>(port)->set_latency_range (latency_range, for_playback);
1781 AlsaAudioBackend::get_latency_range (PortEngine::PortHandle port, bool for_playback)
1784 if (!valid_port (port)) {
1785 PBD::error << _("AlsaPort::get_latency_range (): invalid port.") << endmsg;
1790 AlsaPort *p = static_cast<AlsaPort*>(port);
1793 r = p->latency_range (for_playback);
1794 if (p->is_physical() && p->is_terminal()) {
1795 if (p->is_input() && for_playback) {
1796 r.min += _samples_per_period;
1797 r.max += _samples_per_period;
1799 if (p->is_output() && !for_playback) {
1800 r.min += _samples_per_period;
1801 r.max += _samples_per_period;
1807 /* Discovering physical ports */
1810 AlsaAudioBackend::port_is_physical (PortEngine::PortHandle port) const
1812 if (!valid_port (port)) {
1813 PBD::error << _("AlsaPort::port_is_physical (): invalid port.") << endmsg;
1816 return static_cast<AlsaPort*>(port)->is_physical ();
1820 AlsaAudioBackend::get_physical_outputs (DataType type, std::vector<std::string>& port_names)
1822 for (PortIndex::iterator i = _ports.begin (); i != _ports.end (); ++i) {
1823 AlsaPort* port = *i;
1824 if ((port->type () == type) && port->is_input () && port->is_physical ()) {
1825 port_names.push_back (port->name ());
1831 AlsaAudioBackend::get_physical_inputs (DataType type, std::vector<std::string>& port_names)
1833 for (PortIndex::iterator i = _ports.begin (); i != _ports.end (); ++i) {
1834 AlsaPort* port = *i;
1835 if ((port->type () == type) && port->is_output () && port->is_physical ()) {
1836 port_names.push_back (port->name ());
1842 AlsaAudioBackend::n_physical_outputs () const
1846 for (PortIndex::const_iterator i = _ports.begin (); i != _ports.end (); ++i) {
1847 AlsaPort* port = *i;
1848 if (port->is_output () && port->is_physical ()) {
1849 switch (port->type ()) {
1850 case DataType::AUDIO: ++n_audio; break;
1851 case DataType::MIDI: ++n_midi; break;
1857 cc.set (DataType::AUDIO, n_audio);
1858 cc.set (DataType::MIDI, n_midi);
1863 AlsaAudioBackend::n_physical_inputs () const
1867 for (PortIndex::const_iterator i = _ports.begin (); i != _ports.end (); ++i) {
1868 AlsaPort* port = *i;
1869 if (port->is_input () && port->is_physical ()) {
1870 switch (port->type ()) {
1871 case DataType::AUDIO: ++n_audio; break;
1872 case DataType::MIDI: ++n_midi; break;
1878 cc.set (DataType::AUDIO, n_audio);
1879 cc.set (DataType::MIDI, n_midi);
1883 /* Getting access to the data buffer for a port */
1886 AlsaAudioBackend::get_buffer (PortEngine::PortHandle port, pframes_t nframes)
1889 assert (valid_port (port));
1890 return static_cast<AlsaPort*>(port)->get_buffer (nframes);
1893 /* Engine Process */
1895 AlsaAudioBackend::main_process_thread ()
1897 AudioEngine::thread_init_callback (this);
1899 bool reset_dll = true;
1900 int last_n_periods = 0;
1901 _processed_samples = 0;
1903 double dll_dt = (double) _samples_per_period / (double) _samplerate;
1904 double dll_w1 = 2 * M_PI * 0.1 * dll_dt;
1905 double dll_w2 = dll_w1 * dll_w1;
1908 _pcmi->pcm_start ();
1909 int no_proc_errors = 0;
1910 const int bailout = 5 * _samplerate / _samples_per_period;
1912 manager.registration_callback();
1913 manager.graph_order_callback();
1915 const double sr_norm = 1e-6 * (double) _samplerate / (double)_samples_per_period;
1920 bool drain_slaves = false;
1922 if (_freewheeling != _freewheel) {
1923 _freewheel = _freewheeling;
1924 engine.freewheel_callback (_freewheel);
1925 for (AudioSlaves::iterator s = _slaves.begin (); s != _slaves.end (); ++s) {
1926 (*s)->freewheel (_freewheel);
1930 _pcmi->pcm_start ();
1931 drain_slaves = true;
1936 nr = _pcmi->pcm_wait ();
1939 uint64_t clock0 = g_get_monotonic_time();
1940 if (reset_dll || last_n_periods != 1) {
1942 drain_slaves = true;
1943 dll_dt = 1e6 * (double) _samples_per_period / (double)_samplerate;
1945 _t1 = clock0 + dll_dt;
1947 const double er = clock0 - _t1;
1949 _t1 = _t1 + dll_w1 * er + dll_dt;
1950 dll_dt += dll_w2 * er;
1953 for (AudioSlaves::iterator s = _slaves.begin (); s != _slaves.end (); ++s) {
1958 /* slave died, unregister its ports (not rt-safe, but no matter) */
1959 PBD::error << _("ALSA Slave device halted") << endmsg;
1960 for (std::vector<AlsaPort*>::const_iterator it = (*s)->inputs.begin (); it != (*s)->inputs.end (); ++it) {
1961 unregister_port (*it);
1963 for (std::vector<AlsaPort*>::const_iterator it = (*s)->outputs.begin (); it != (*s)->outputs.end (); ++it) {
1964 unregister_port (*it);
1966 (*s)->inputs.clear ();
1967 (*s)->outputs.clear ();
1968 (*s)->active = false;
1972 (*s)->active = (*s)->running () && (*s)->state () >= 0;
1973 if (!(*s)->active) {
1976 (*s)->cycle_start (_t0, (_t1 - _t0) * sr_norm, drain_slaves);
1979 if (_pcmi->state () > 0) {
1983 if (_pcmi->state () < 0) {
1984 PBD::error << _("AlsaAudioBackend: I/O error. Audio Process Terminated.") << endmsg;
1987 if (no_proc_errors > bailout) {
1990 _("AlsaAudioBackend: Audio Process Terminated after %1 consecutive x-runs."),
1997 while (nr >= (long)_samples_per_period && _freewheeling == _freewheel) {
1999 clock1 = g_get_monotonic_time();
2002 _pcmi->capt_init (_samples_per_period);
2003 for (std::vector<AlsaPort*>::const_iterator it = _system_inputs.begin (); it != _system_inputs.end (); ++it, ++i) {
2004 _pcmi->capt_chan (i, (float*)((*it)->get_buffer(_samples_per_period)), _samples_per_period);
2006 _pcmi->capt_done (_samples_per_period);
2008 for (AudioSlaves::iterator s = _slaves.begin (); s != _slaves.end (); ++s) {
2009 if (!(*s)->active) {
2013 for (std::vector<AlsaPort*>::const_iterator it = (*s)->inputs.begin (); it != (*s)->inputs.end (); ++it, ++i) {
2014 (*s)->capt_chan (i, (float*)((*it)->get_buffer(_samples_per_period)), _samples_per_period);
2018 /* de-queue incoming midi*/
2020 for (std::vector<AlsaPort*>::const_iterator it = _system_midi_in.begin (); it != _system_midi_in.end (); ++it, ++i) {
2021 assert (_rmidi_in.size() > i);
2022 AlsaMidiIn *rm = _rmidi_in.at(i);
2023 void *bptr = (*it)->get_buffer(0);
2025 uint8_t data[MaxAlsaMidiEventSize];
2026 size_t size = sizeof(data);
2028 while (rm->recv_event (time, data, size)) {
2029 midi_event_put(bptr, time, data, size);
2030 size = sizeof(data);
2032 rm->sync_time (clock1);
2035 for (std::vector<AlsaPort*>::const_iterator it = _system_outputs.begin (); it != _system_outputs.end (); ++it) {
2036 memset ((*it)->get_buffer (_samples_per_period), 0, _samples_per_period * sizeof (Sample));
2039 /* call engine process callback */
2040 _last_process_start = g_get_monotonic_time();
2041 if (engine.process_callback (_samples_per_period)) {
2047 for (std::vector<AlsaPort*>::iterator it = _system_midi_out.begin (); it != _system_midi_out.end (); ++it) {
2048 static_cast<AlsaMidiPort*>(*it)->next_period();
2051 /* queue outgoing midi */
2053 for (std::vector<AlsaPort*>::const_iterator it = _system_midi_out.begin (); it != _system_midi_out.end (); ++it, ++i) {
2054 assert (_rmidi_out.size() > i);
2055 const AlsaMidiBuffer * src = static_cast<const AlsaMidiPort*>(*it)->const_buffer();
2056 AlsaMidiOut *rm = _rmidi_out.at(i);
2057 rm->sync_time (clock1);
2058 for (AlsaMidiBuffer::const_iterator mit = src->begin (); mit != src->end (); ++mit) {
2059 rm->send_event (mit->timestamp (), mit->data (), mit->size ());
2063 /* write back audio */
2065 _pcmi->play_init (_samples_per_period);
2066 for (std::vector<AlsaPort*>::const_iterator it = _system_outputs.begin (); it != _system_outputs.end (); ++it, ++i) {
2067 _pcmi->play_chan (i, (const float*)(*it)->get_buffer (_samples_per_period), _samples_per_period);
2069 for (; i < _pcmi->nplay (); ++i) {
2070 _pcmi->clear_chan (i, _samples_per_period);
2072 _pcmi->play_done (_samples_per_period);
2074 for (AudioSlaves::iterator s = _slaves.begin (); s != _slaves.end (); ++s) {
2075 if (!(*s)->active) {
2079 for (std::vector<AlsaPort*>::const_iterator it = (*s)->outputs.begin (); it != (*s)->outputs.end (); ++it, ++i) {
2080 (*s)->play_chan (i, (float*)((*it)->get_buffer(_samples_per_period)), _samples_per_period);
2085 nr -= _samples_per_period;
2086 _processed_samples += _samples_per_period;
2088 _dsp_load_calc.set_max_time(_samplerate, _samples_per_period);
2089 _dsp_load_calc.set_start_timestamp_us (clock1);
2090 _dsp_load_calc.set_stop_timestamp_us (g_get_monotonic_time());
2091 _dsp_load = _dsp_load_calc.get_dsp_load ();
2095 if (xrun && (_pcmi->capt_xrun() > 0 || _pcmi->play_xrun() > 0)) {
2099 fprintf(stderr, "ALSA x-run read: %.2f ms, write: %.2f ms\n",
2100 _pcmi->capt_xrun() * 1000.0, _pcmi->play_xrun() * 1000.0);
2106 // zero audio input buffers
2107 for (std::vector<AlsaPort*>::const_iterator it = _system_inputs.begin (); it != _system_inputs.end (); ++it) {
2108 memset ((*it)->get_buffer (_samples_per_period), 0, _samples_per_period * sizeof (Sample));
2111 clock1 = g_get_monotonic_time();
2113 for (std::vector<AlsaPort*>::const_iterator it = _system_midi_in.begin (); it != _system_midi_in.end (); ++it, ++i) {
2114 static_cast<AlsaMidiBuffer*>((*it)->get_buffer(0))->clear ();
2115 AlsaMidiIn *rm = _rmidi_in.at(i);
2116 void *bptr = (*it)->get_buffer(0);
2117 midi_clear(bptr); // zero midi buffer
2119 // TODO add an API call for this.
2121 uint8_t data[64]; // match MaxAlsaEventSize in alsa_rawmidi.cc
2122 size_t size = sizeof(data);
2123 while (rm->recv_event (time, data, size)) {
2124 ; // discard midi-data from HW.
2126 rm->sync_time (clock1);
2129 _last_process_start = 0;
2130 if (engine.process_callback (_samples_per_period)) {
2136 // drop all outgoing MIDI messages
2137 for (std::vector<AlsaPort*>::const_iterator it = _system_midi_out.begin (); it != _system_midi_out.end (); ++it) {
2138 void *bptr = (*it)->get_buffer(0);
2144 Glib::usleep (100); // don't hog cpu
2147 bool connections_changed = false;
2148 bool ports_changed = false;
2149 if (!pthread_mutex_trylock (&_port_callback_mutex)) {
2150 if (_port_change_flag) {
2151 ports_changed = true;
2152 _port_change_flag = false;
2154 if (!_port_connection_queue.empty ()) {
2155 connections_changed = true;
2157 while (!_port_connection_queue.empty ()) {
2158 PortConnectData *c = _port_connection_queue.back ();
2159 manager.connect_callback (c->a, c->b, c->c);
2160 _port_connection_queue.pop_back ();
2163 pthread_mutex_unlock (&_port_callback_mutex);
2165 if (ports_changed) {
2166 manager.registration_callback();
2168 if (connections_changed) {
2169 manager.graph_order_callback();
2171 if (connections_changed || ports_changed) {
2172 update_system_port_latecies (); // flush, clear
2173 engine.latency_callback(false);
2174 engine.latency_callback(true);
2181 engine.halted_callback("ALSA I/O error.");
2186 /******************************************************************************/
2189 AlsaAudioBackend::add_slave (const char* device,
2190 unsigned int slave_rate,
2191 unsigned int slave_spp,
2192 unsigned int duplex)
2194 AudioSlave* s = new AudioSlave (device, duplex,
2195 _samplerate, _samples_per_period,
2196 slave_rate, slave_spp, 2);
2199 // TODO parse error status
2200 PBD::error << string_compose (_("Failed to create slave device '%1' error %2\n"), device, s->state ()) << endmsg;
2204 for (uint32_t i = 0, n = 1; i < s->ncapt (); ++i) {
2207 snprintf(tmp, sizeof(tmp), "extern:capture_%d", n);
2208 if (find_port (tmp)) {
2214 PortHandle p = add_port(std::string(tmp), DataType::AUDIO, static_cast<PortFlags>(IsOutput | IsPhysical | IsTerminal));
2215 if (!p) goto errout;
2216 AlsaPort *ap = static_cast<AlsaPort*>(p);
2217 s->inputs.push_back (ap);
2220 for (uint32_t i = 0, n = 1; i < s->nplay (); ++i) {
2223 snprintf(tmp, sizeof(tmp), "extern:playback_%d", n);
2224 if (find_port (tmp)) {
2230 PortHandle p = add_port(std::string(tmp), DataType::AUDIO, static_cast<PortFlags>(IsInput | IsPhysical | IsTerminal));
2231 if (!p) goto errout;
2232 AlsaPort *ap = static_cast<AlsaPort*>(p);
2233 s->outputs.push_back (ap);
2237 PBD::error << string_compose (_("Failed to start slave device '%1'\n"), device) << endmsg;
2240 s->UpdateLatency.connect_same_thread (s->latency_connection, boost::bind (&AlsaAudioBackend::update_latencies, this));
2241 _slaves.push_back (s);
2245 delete s; // releases device
2249 AlsaAudioBackend::AudioSlave::AudioSlave (
2251 unsigned int duplex,
2252 unsigned int master_rate,
2253 unsigned int master_samples_per_period,
2254 unsigned int slave_rate,
2255 unsigned int slave_samples_per_period,
2256 unsigned int periods_per_cycle)
2257 : AlsaDeviceReservation (device)
2259 (duplex & 1) ? device : NULL /* playback */,
2260 (duplex & 2) ? device : NULL /* capture */,
2261 master_rate, master_samples_per_period,
2262 slave_rate, slave_samples_per_period, periods_per_cycle)
2267 Halted.connect_same_thread (_halted_connection, boost::bind (&AudioSlave::halted, this));
2270 AlsaAudioBackend::AudioSlave::~AudioSlave ()
2276 AlsaAudioBackend::AudioSlave::halted ()
2278 // Note: Halted() is emitted from the Slave's process thread.
2284 AlsaAudioBackend::AudioSlave::update_latencies (uint32_t play, uint32_t capt)
2287 lr.min = lr.max = (capt);
2288 for (std::vector<AlsaPort*>::const_iterator it = inputs.begin (); it != inputs.end (); ++it) {
2289 (*it)->set_latency_range (lr, false);
2292 lr.min = lr.max = play;
2293 for (std::vector<AlsaPort*>::const_iterator it = outputs.begin (); it != outputs.end (); ++it) {
2294 (*it)->set_latency_range (lr, true);
2296 printf (" ----- SLAVE LATENCY play=%d capt=%d\n", play, capt); // XXX DEBUG
2297 UpdateLatency (); /* EMIT SIGNAL */
2300 /******************************************************************************/
2302 static boost::shared_ptr<AlsaAudioBackend> _instance;
2304 static boost::shared_ptr<AudioBackend> backend_factory (AudioEngine& e);
2305 static int instantiate (const std::string& arg1, const std::string& /* arg2 */);
2306 static int deinstantiate ();
2307 static bool already_configured ();
2308 static bool available ();
2310 static ARDOUR::AudioBackendInfo _descriptor = {
2319 static boost::shared_ptr<AudioBackend>
2320 backend_factory (AudioEngine& e)
2323 _instance.reset (new AlsaAudioBackend (e, _descriptor));
2329 instantiate (const std::string& arg1, const std::string& /* arg2 */)
2331 s_instance_name = arg1;
2343 already_configured ()
2354 extern "C" ARDOURBACKEND_API ARDOUR::AudioBackendInfo* descriptor ()
2356 return &_descriptor;
2360 /******************************************************************************/
2361 AlsaPort::AlsaPort (AlsaAudioBackend &b, const std::string& name, PortFlags flags)
2366 _capture_latency_range.min = 0;
2367 _capture_latency_range.max = 0;
2368 _playback_latency_range.min = 0;
2369 _playback_latency_range.max = 0;
2372 AlsaPort::~AlsaPort () {
2376 int AlsaPort::connect (AlsaPort *port)
2379 PBD::error << _("AlsaPort::connect (): invalid (null) port") << endmsg;
2383 if (type () != port->type ()) {
2384 PBD::error << _("AlsaPort::connect (): wrong port-type") << endmsg;
2388 if (is_output () && port->is_output ()) {
2389 PBD::error << _("AlsaPort::connect (): cannot inter-connect output ports.") << endmsg;
2393 if (is_input () && port->is_input ()) {
2394 PBD::error << _("AlsaPort::connect (): cannot inter-connect input ports.") << endmsg;
2399 PBD::error << _("AlsaPort::connect (): cannot self-connect ports.") << endmsg;
2403 if (is_connected (port)) {
2404 #if 0 // don't bother to warn about this for now. just ignore it
2405 PBD::error << _("AlsaPort::connect (): ports are already connected:")
2406 << " (" << name () << ") -> (" << port->name () << ")"
2412 _connect (port, true);
2416 void AlsaPort::_connect (AlsaPort *port, bool callback)
2418 _connections.insert (port);
2420 port->_connect (this, false);
2421 _alsa_backend.port_connect_callback (name(), port->name(), true);
2425 int AlsaPort::disconnect (AlsaPort *port)
2428 PBD::error << _("AlsaPort::disconnect (): invalid (null) port") << endmsg;
2432 if (!is_connected (port)) {
2433 PBD::error << _("AlsaPort::disconnect (): ports are not connected:")
2434 << " (" << name () << ") -> (" << port->name () << ")"
2438 _disconnect (port, true);
2442 void AlsaPort::_disconnect (AlsaPort *port, bool callback)
2444 std::set<AlsaPort*>::iterator it = _connections.find (port);
2445 assert (it != _connections.end ());
2446 _connections.erase (it);
2448 port->_disconnect (this, false);
2449 _alsa_backend.port_connect_callback (name(), port->name(), false);
2454 void AlsaPort::disconnect_all ()
2456 while (!_connections.empty ()) {
2457 std::set<AlsaPort*>::iterator it = _connections.begin ();
2458 (*it)->_disconnect (this, false);
2459 _alsa_backend.port_connect_callback (name(), (*it)->name(), false);
2460 _connections.erase (it);
2465 AlsaPort::is_connected (const AlsaPort *port) const
2467 return _connections.find (const_cast<AlsaPort *>(port)) != _connections.end ();
2470 bool AlsaPort::is_physically_connected () const
2472 for (std::set<AlsaPort*>::const_iterator it = _connections.begin (); it != _connections.end (); ++it) {
2473 if ((*it)->is_physical ()) {
2481 AlsaPort::set_latency_range (const LatencyRange &latency_range, bool for_playback)
2484 _playback_latency_range = latency_range;
2486 _capture_latency_range = latency_range;
2489 for (std::set<AlsaPort*>::const_iterator it = _connections.begin (); it != _connections.end (); ++it) {
2490 if ((*it)->is_physical ()) {
2491 (*it)->update_connected_latency (is_input ());
2497 AlsaPort::update_connected_latency (bool for_playback)
2500 lr.min = lr.max = 0;
2501 for (std::set<AlsaPort*>::const_iterator it = _connections.begin (); it != _connections.end (); ++it) {
2503 l = (*it)->latency_range (for_playback);
2504 lr.min = std::max (lr.min, l.min);
2505 lr.max = std::max (lr.max, l.max);
2507 set_latency_range (lr, for_playback);
2510 /******************************************************************************/
2512 AlsaAudioPort::AlsaAudioPort (AlsaAudioBackend &b, const std::string& name, PortFlags flags)
2513 : AlsaPort (b, name, flags)
2515 memset (_buffer, 0, sizeof (_buffer));
2516 mlock(_buffer, sizeof (_buffer));
2519 AlsaAudioPort::~AlsaAudioPort () { }
2521 void* AlsaAudioPort::get_buffer (pframes_t n_samples)
2524 const std::set<AlsaPort *>& connections = get_connections ();
2525 std::set<AlsaPort*>::const_iterator it = connections.begin ();
2526 if (it == connections.end ()) {
2527 memset (_buffer, 0, n_samples * sizeof (Sample));
2529 AlsaAudioPort const * source = static_cast<const AlsaAudioPort*>(*it);
2530 assert (source && source->is_output ());
2531 memcpy (_buffer, source->const_buffer (), n_samples * sizeof (Sample));
2532 while (++it != connections.end ()) {
2533 source = static_cast<const AlsaAudioPort*>(*it);
2534 assert (source && source->is_output ());
2535 Sample* dst = buffer ();
2536 const Sample* src = source->const_buffer ();
2537 for (uint32_t s = 0; s < n_samples; ++s, ++dst, ++src) {
2547 AlsaMidiPort::AlsaMidiPort (AlsaAudioBackend &b, const std::string& name, PortFlags flags)
2548 : AlsaPort (b, name, flags)
2552 _buffer[0].clear ();
2553 _buffer[1].clear ();
2554 _buffer[2].clear ();
2556 _buffer[0].reserve(256);
2557 _buffer[1].reserve(256);
2558 _buffer[2].reserve(256);
2561 AlsaMidiPort::~AlsaMidiPort () { }
2563 struct MidiEventSorter {
2564 bool operator() (AlsaMidiEvent const& a, AlsaMidiEvent const& b) {
2569 void* AlsaMidiPort::get_buffer (pframes_t /* nframes */)
2572 (_buffer[_bufperiod]).clear ();
2573 const std::set<AlsaPort*>& connections = get_connections ();
2574 for (std::set<AlsaPort*>::const_iterator i = connections.begin ();
2575 i != connections.end ();
2577 const AlsaMidiBuffer * src = static_cast<const AlsaMidiPort*>(*i)->const_buffer ();
2578 for (AlsaMidiBuffer::const_iterator it = src->begin (); it != src->end (); ++it) {
2579 (_buffer[_bufperiod]).push_back (*it);
2582 std::stable_sort ((_buffer[_bufperiod]).begin (), (_buffer[_bufperiod]).end (), MidiEventSorter());
2584 return &(_buffer[_bufperiod]);
2587 AlsaMidiEvent::AlsaMidiEvent (const pframes_t timestamp, const uint8_t* data, size_t size)
2589 , _timestamp (timestamp)
2591 if (size > 0 && size < MaxAlsaMidiEventSize) {
2592 memcpy (_data, data, size);
2596 AlsaMidiEvent::AlsaMidiEvent (const AlsaMidiEvent& other)
2597 : _size (other.size ())
2598 , _timestamp (other.timestamp ())
2600 if (other._size > 0) {
2601 assert (other._size < MaxAlsaMidiEventSize);
2602 memcpy (_data, other._data, other._size);
2606 /******************************************************************************/
2608 AlsaDeviceReservation::AlsaDeviceReservation ()
2609 : _device_reservation (0)
2612 AlsaDeviceReservation::AlsaDeviceReservation (const char* device_name)
2613 : _device_reservation (0)
2615 acquire_device (device_name);
2618 AlsaDeviceReservation::~AlsaDeviceReservation ()
2624 AlsaDeviceReservation::acquire_device (const char* device_name)
2626 int device_number = card_to_num(device_name);
2627 if (device_number < 0) return false;
2629 assert(_device_reservation == 0);
2630 _reservation_succeeded = false;
2632 std::string request_device_exe;
2633 if (!PBD::find_file (
2634 PBD::Searchpath(Glib::build_filename(ARDOUR::ardour_dll_directory(), "ardouralsautil")
2635 + G_SEARCHPATH_SEPARATOR_S + ARDOUR::ardour_dll_directory()),
2636 "ardour-request-device", request_device_exe))
2638 PBD::warning << "ardour-request-device binary was not found..'" << endmsg;
2644 argp=(char**) calloc(5,sizeof(char*));
2645 argp[0] = strdup(request_device_exe.c_str());
2646 argp[1] = strdup("-P");
2647 snprintf(tmp, sizeof(tmp), "%d", getpid());
2648 argp[2] = strdup(tmp);
2649 snprintf(tmp, sizeof(tmp), "Audio%d", device_number);
2650 argp[3] = strdup(tmp);
2653 _device_reservation = new ARDOUR::SystemExec(request_device_exe, argp);
2654 _device_reservation->ReadStdout.connect_same_thread (_reservation_connection, boost::bind (&AlsaDeviceReservation::reservation_stdout, this, _1 ,_2));
2655 _device_reservation->Terminated.connect_same_thread (_reservation_connection, boost::bind (&AlsaDeviceReservation::release_device, this));
2657 if (_device_reservation->start(0)) {
2658 PBD::warning << _("AlsaAudioBackend: Device Request failed.") << endmsg;
2663 /* wait to check if reservation suceeded. */
2664 int timeout = 500; // 5 sec
2665 while (_device_reservation && !_reservation_succeeded && --timeout > 0) {
2666 Glib::usleep(10000);
2669 if (timeout == 0 || !_reservation_succeeded) {
2670 PBD::warning << _("AlsaAudioBackend: Device Reservation failed.") << endmsg;
2678 AlsaDeviceReservation::release_device ()
2680 _reservation_connection.drop_connections();
2681 ARDOUR::SystemExec* tmp = _device_reservation;
2682 _device_reservation = 0;
2687 AlsaDeviceReservation::reservation_stdout (std::string d, size_t /* s */)
2689 if (d.substr(0, 19) == "Acquired audio-card") {
2690 _reservation_succeeded = true;