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https://github.com/Ardour/ardour.git
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ALSA Backend: Separate Device Reservation into its own class
This commit is contained in:
Robin Gareus
parent
71424c9db5
commit
128a985361
2 changed files with 114 additions and 92 deletions
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@ -59,7 +59,6 @@ AlsaAudioBackend::AlsaAudioBackend (AudioEngine& e, AudioBackendInfo& info)
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, _input_audio_device("")
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, _output_audio_device("")
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, _midi_driver_option(get_standard_device_name(DeviceNone))
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, _device_reservation(0)
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, _samplerate (48000)
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, _samples_per_period (1024)
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, _periods_per_cycle (2)
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@ -142,83 +141,6 @@ AlsaAudioBackend::enumerate_output_devices () const
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return _output_audio_device_status;
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}
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void
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AlsaAudioBackend::reservation_stdout (std::string d, size_t /* s */)
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{
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if (d.substr(0, 19) == "Acquired audio-card") {
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_reservation_succeeded = true;
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}
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}
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void
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AlsaAudioBackend::release_device()
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{
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_reservation_connection.drop_connections();
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ARDOUR::SystemExec * tmp = _device_reservation;
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_device_reservation = 0;
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delete tmp;
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}
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bool
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AlsaAudioBackend::acquire_device(const char* device_name)
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{
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/* This is quick hack, ideally we'll link against libdbus and implement a dbus-listener
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* that owns the device. here we try to get away by just requesting it and then block it...
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* (pulseaudio periodically checks anyway)
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*
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* dbus-send --session --print-reply --type=method_call --dest=org.freedesktop.ReserveDevice1.Audio2 /org/freedesktop/ReserveDevice1/Audio2 org.freedesktop.ReserveDevice1.RequestRelease int32:4
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* -> should not return 'boolean false'
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*/
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int device_number = card_to_num(device_name);
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if (device_number < 0) return false;
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assert(_device_reservation == 0);
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_reservation_succeeded = false;
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std::string request_device_exe;
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if (!PBD::find_file (
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PBD::Searchpath(Glib::build_filename(ARDOUR::ardour_dll_directory(), "ardouralsautil")
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+ G_SEARCHPATH_SEPARATOR_S + ARDOUR::ardour_dll_directory()),
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"ardour-request-device", request_device_exe))
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{
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PBD::warning << "ardour-request-device binary was not found..'" << endmsg;
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return false;
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}
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else
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{
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char **argp;
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char tmp[128];
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argp=(char**) calloc(5,sizeof(char*));
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argp[0] = strdup(request_device_exe.c_str());
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argp[1] = strdup("-P");
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snprintf(tmp, sizeof(tmp), "%d", getpid());
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argp[2] = strdup(tmp);
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snprintf(tmp, sizeof(tmp), "Audio%d", device_number);
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argp[3] = strdup(tmp);
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argp[4] = 0;
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_device_reservation = new ARDOUR::SystemExec(request_device_exe, argp);
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_device_reservation->ReadStdout.connect_same_thread (_reservation_connection, boost::bind (&AlsaAudioBackend::reservation_stdout, this, _1 ,_2));
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_device_reservation->Terminated.connect_same_thread (_reservation_connection, boost::bind (&AlsaAudioBackend::release_device, this));
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if (_device_reservation->start(0)) {
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PBD::warning << _("AlsaAudioBackend: Device Request failed.") << endmsg;
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release_device();
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return false;
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}
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}
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// wait to check if reservation suceeded.
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int timeout = 500; // 5 sec
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while (_device_reservation && !_reservation_succeeded && --timeout > 0) {
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Glib::usleep(10000);
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}
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if (timeout == 0 || !_reservation_succeeded) {
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PBD::warning << _("AlsaAudioBackend: Device Reservation failed.") << endmsg;
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release_device();
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return false;
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}
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return true;
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}
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std::vector<float>
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AlsaAudioBackend::available_sample_rates2 (const std::string& input_device, const std::string& output_device) const
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{
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@ -834,7 +756,7 @@ AlsaAudioBackend::_start (bool for_latency_measurement)
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_freewheel = false;
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_last_process_start = 0;
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release_device();
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_device_reservation.release_device();
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assert(_rmidi_in.size() == 0);
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assert(_rmidi_out.size() == 0);
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@ -881,7 +803,7 @@ AlsaAudioBackend::_start (bool for_latency_measurement)
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return AudioDeviceNotAvailableError;
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}
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acquire_device(alsa_device.c_str());
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_device_reservation.acquire_device(alsa_device.c_str());
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_pcmi = new Alsa_pcmi (
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(duplex & 2) ? alsa_device.c_str() : NULL,
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(duplex & 1) ? alsa_device.c_str() : NULL,
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@ -929,7 +851,7 @@ AlsaAudioBackend::_start (bool for_latency_measurement)
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if (_pcmi->state ()) {
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delete _pcmi; _pcmi = 0;
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release_device();
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_device_reservation.release_device();
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return error_code;
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}
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@ -974,7 +896,7 @@ AlsaAudioBackend::_start (bool for_latency_measurement)
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if (register_system_audio_ports()) {
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PBD::error << _("AlsaAudioBackend: failed to register system ports.") << endmsg;
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delete _pcmi; _pcmi = 0;
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release_device();
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_device_reservation.release_device();
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return PortRegistrationError;
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}
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@ -984,7 +906,7 @@ AlsaAudioBackend::_start (bool for_latency_measurement)
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if (engine.reestablish_ports ()) {
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PBD::error << _("AlsaAudioBackend: Could not re-establish ports.") << endmsg;
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delete _pcmi; _pcmi = 0;
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release_device();
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_device_reservation.release_device();
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return PortReconnectError;
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}
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@ -999,7 +921,7 @@ AlsaAudioBackend::_start (bool for_latency_measurement)
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{
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PBD::error << _("AlsaAudioBackend: failed to create process thread.") << endmsg;
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delete _pcmi; _pcmi = 0;
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release_device();
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_device_reservation.release_device();
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_run = false;
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return ProcessThreadStartError;
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} else {
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@ -1013,7 +935,7 @@ AlsaAudioBackend::_start (bool for_latency_measurement)
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if (timeout == 0 || !_active) {
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PBD::error << _("AlsaAudioBackend: failed to start process thread.") << endmsg;
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delete _pcmi; _pcmi = 0;
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release_device();
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_device_reservation.release_device();
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_run = false;
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return ProcessThreadStartError;
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}
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@ -1051,7 +973,7 @@ AlsaAudioBackend::stop ()
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unregister_ports();
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delete _pcmi; _pcmi = 0;
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_midi_ins = _midi_outs = 0;
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release_device();
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_device_reservation.release_device();
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_measure_latency = false;
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return (_active == false) ? 0 : -1;
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@ -2377,3 +2299,91 @@ AlsaMidiEvent::AlsaMidiEvent (const AlsaMidiEvent& other)
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memcpy (_data, other._data, other._size);
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}
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};
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/******************************************************************************/
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AlsaDeviceReservation::AlsaDeviceReservation ()
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: _device_reservation (0)
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{}
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AlsaDeviceReservation::AlsaDeviceReservation (const char* device_name)
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: _device_reservation (0)
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{
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acquire_device (device_name);
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}
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AlsaDeviceReservation::~AlsaDeviceReservation ()
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{
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release_device ();
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}
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bool
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AlsaDeviceReservation::acquire_device (const char* device_name)
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{
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int device_number = card_to_num(device_name);
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if (device_number < 0) return false;
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assert(_device_reservation == 0);
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_reservation_succeeded = false;
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std::string request_device_exe;
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if (!PBD::find_file (
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PBD::Searchpath(Glib::build_filename(ARDOUR::ardour_dll_directory(), "ardouralsautil")
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+ G_SEARCHPATH_SEPARATOR_S + ARDOUR::ardour_dll_directory()),
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"ardour-request-device", request_device_exe))
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{
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PBD::warning << "ardour-request-device binary was not found..'" << endmsg;
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return false;
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}
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char **argp;
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char tmp[128];
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argp=(char**) calloc(5,sizeof(char*));
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argp[0] = strdup(request_device_exe.c_str());
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argp[1] = strdup("-P");
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snprintf(tmp, sizeof(tmp), "%d", getpid());
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argp[2] = strdup(tmp);
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snprintf(tmp, sizeof(tmp), "Audio%d", device_number);
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argp[3] = strdup(tmp);
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argp[4] = 0;
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_device_reservation = new ARDOUR::SystemExec(request_device_exe, argp);
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_device_reservation->ReadStdout.connect_same_thread (_reservation_connection, boost::bind (&AlsaDeviceReservation::reservation_stdout, this, _1 ,_2));
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_device_reservation->Terminated.connect_same_thread (_reservation_connection, boost::bind (&AlsaDeviceReservation::release_device, this));
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if (_device_reservation->start(0)) {
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PBD::warning << _("AlsaAudioBackend: Device Request failed.") << endmsg;
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release_device();
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return false;
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}
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/* wait to check if reservation suceeded. */
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int timeout = 500; // 5 sec
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while (_device_reservation && !_reservation_succeeded && --timeout > 0) {
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Glib::usleep(10000);
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}
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if (timeout == 0 || !_reservation_succeeded) {
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PBD::warning << _("AlsaAudioBackend: Device Reservation failed.") << endmsg;
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release_device();
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return false;
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}
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return true;
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}
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void
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AlsaDeviceReservation::release_device ()
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{
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_reservation_connection.drop_connections();
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ARDOUR::SystemExec* tmp = _device_reservation;
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_device_reservation = 0;
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delete tmp;
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}
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void
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AlsaDeviceReservation::reservation_stdout (std::string d, size_t /* s */)
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{
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if (d.substr(0, 19) == "Acquired audio-card") {
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_reservation_succeeded = true;
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}
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}
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@ -158,6 +158,23 @@ class AlsaMidiPort : public AlsaPort {
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int _bufperiod;
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}; // class AlsaMidiPort
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class AlsaDeviceReservation
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{
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public:
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AlsaDeviceReservation ();
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AlsaDeviceReservation (const char* device_name);
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~AlsaDeviceReservation ();
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bool acquire_device (const char* device_name);
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void release_device ();
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private:
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ARDOUR::SystemExec* _device_reservation;
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PBD::ScopedConnectionList _reservation_connection;
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void reservation_stdout (std::string, size_t);
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bool _reservation_succeeded;
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};
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class AlsaAudioBackend : public AudioBackend {
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friend class AlsaPort;
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public:
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@ -345,12 +362,7 @@ class AlsaAudioBackend : public AudioBackend {
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std::string _midi_driver_option;
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/* audio device reservation */
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ARDOUR::SystemExec *_device_reservation;
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PBD::ScopedConnectionList _reservation_connection;
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void reservation_stdout (std::string, size_t);
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bool acquire_device(const char* device_name);
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void release_device();
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bool _reservation_succeeded;
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AlsaDeviceReservation _device_reservation;
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/* audio settings */
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float _samplerate;
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