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Dummy backend: add realtime option 

On windows this is still limited by the timer resolution, but
it's a start. This is mainly intended to be used with NDI or
other external sources without actual audio hardware.
This commit is contained in:
Robin Gareus 2023-06-20 00:36:14 +02:00
parent 0dc1c3f008
commit cd4fff863a
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
2 changed files with 21 additions and 8 deletions
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20
libs/backends/dummy/dummy_audiobackend.cc
View File

@ -65,6 +65,7 @@ DummyAudioBackend::DummyAudioBackend (AudioEngine& e, AudioBackendInfo& info)
, _running (false)
, _freewheel (false)
, _freewheeling (false)
, _realtime (false)
, _speedup (1.0)
, _device ("")
, _samplerate (48000)
@ -85,6 +86,7 @@ DummyAudioBackend::DummyAudioBackend (AudioEngine& e, AudioBackendInfo& info)
if (_driver_speed.empty()) {
_driver_speed.push_back (DriverSpeed (_("Half Speed"), 2.0f));
_driver_speed.push_back (DriverSpeed (_("Normal Speed"), 1.0f));
_driver_speed.push_back (DriverSpeed (_("Realtime"), 1.0f, true));
_driver_speed.push_back (DriverSpeed (_("Double Speed"), 0.5f));
_driver_speed.push_back (DriverSpeed (_("5x Speed"), 0.2f));
_driver_speed.push_back (DriverSpeed (_("10x Speed"), 0.1f));
@ -227,6 +229,7 @@ DummyAudioBackend::set_driver (const std::string& d)
for (std::vector<DriverSpeed>::const_iterator it = _driver_speed.begin () ; it != _driver_speed.end (); ++it) {
if (d == it->name) {
_speedup = it->speedup;
_realtime = it->realtime;
return 0;
}
}
@ -463,7 +466,13 @@ DummyAudioBackend::_start (bool /*for_latency_measurement*/)
engine.reconnect_ports ();
_port_change_flag.store (0);
if (pbd_pthread_create (PBD_RT_STACKSIZE_PROC, &_main_thread, pthread_process, this)) {
bool ok = _realtime;
if (_realtime && pbd_realtime_pthread_create (PBD_SCHED_FIFO, PBD_RT_PRI_MAIN, PBD_RT_STACKSIZE_PROC, &_main_thread, pthread_process, this)) {
PBD::warning << _("DummyAudioBackend: failed to acquire realtime permissions.") << endmsg;
ok = false;
}
if (!ok && pbd_pthread_create (PBD_RT_STACKSIZE_PROC, &_main_thread, pthread_process, this)) {
PBD::error << _("DummyAudioBackend: cannot start.") << endmsg;
}
@ -556,7 +565,8 @@ DummyAudioBackend::create_process_thread (boost::function<void()> func)
pthread_t thread_id;
ThreadData* td = new ThreadData (this, func, PBD_RT_STACKSIZE_PROC);
if (pbd_pthread_create (PBD_RT_STACKSIZE_PROC, &thread_id, dummy_process_thread, td)) {
bool ok = _realtime && 0 == pbd_realtime_pthread_create (PBD_SCHED_FIFO, PBD_RT_PRI_PROC, PBD_RT_STACKSIZE_PROC, &thread_id, dummy_process_thread, td);
if (!ok && pbd_pthread_create (PBD_RT_STACKSIZE_PROC, &thread_id, dummy_process_thread, td)) {
PBD::error << _("AudioEngine: cannot create process thread.") << endmsg;
return -1;
}
@ -997,13 +1007,13 @@ DummyAudioBackend::main_process_thread ()
const int64_t nominal_time = _dsp_load_calc.get_max_time_us ();
if (elapsed_time < nominal_time) {
const int64_t sleepy = _speedup * (nominal_time - elapsed_time);
Glib::usleep (std::max ((int64_t) 100, sleepy));
Glib::usleep (std::max ((int64_t) 10, sleepy));
} else {
Glib::usleep (100); // don't hog cpu
Glib::usleep (10); // don't hog cpu
}
} else {
_dsp_load = 1.0f;
Glib::usleep (100); // don't hog cpu
Glib::usleep (10); // don't hog cpu
}
/* beginning of next cycle */

9
libs/backends/dummy/dummy_audiobackend.h
View File

@ -183,9 +183,10 @@ class DummyMidiPort : public DummyPort {
DummyMidiData::MIDISequence const * _midi_seq_dat;
}; // class DummyMidiPort
class DummyAudioBackend : public AudioBackend, public PortEngineSharedImpl {
class DummyAudioBackend : public AudioBackend, public PortEngineSharedImpl
{
public:
DummyAudioBackend (AudioEngine& e, AudioBackendInfo& info);
DummyAudioBackend (AudioEngine& e, AudioBackendInfo& info);
~DummyAudioBackend ();
bool is_running () const { return _running; }
@ -350,7 +351,8 @@ class DummyAudioBackend : public AudioBackend, public PortEngineSharedImpl {
struct DriverSpeed {
std::string name;
float speedup;
DriverSpeed (const std::string& n, float s) : name (n), speedup (s) {}
bool realtime;
DriverSpeed (const std::string& n, float s, bool r = false) : name (n), speedup (s), realtime (r) {}
};
std::string _instance_name;
@ -361,6 +363,7 @@ class DummyAudioBackend : public AudioBackend, public PortEngineSharedImpl {
bool _running;
bool _freewheel;
bool _freewheeling;
bool _realtime;
float _speedup;
std::string _device;