DummyAudioBackend: basic process threads and support structure
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@ -17,6 +17,7 @@
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <sys/time.h>
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#include "dummy_audiobackend.h"
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#include "pbd/error.h"
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#include "i18n.h"
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@ -26,6 +27,16 @@ using namespace ARDOUR;
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static std::string s_instance_name;
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DummyAudioBackend::DummyAudioBackend (AudioEngine& e)
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: AudioBackend (e)
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, _running (false)
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, _freewheeling (false)
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, _samplerate (48000)
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, _audio_buffersize (1024)
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, _dsp_load (0)
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, _n_inputs (0)
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, _n_outputs (0)
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, _systemic_input_latency (0)
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, _systemic_output_latency (0)
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, _processed_samples (0)
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{
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_instance_name = s_instance_name;
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}
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@ -89,31 +100,37 @@ DummyAudioBackend::available_output_channel_count (const std::string&) const
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bool
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DummyAudioBackend::can_change_sample_rate_when_running () const
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{
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return false;
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return true;
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}
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bool
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DummyAudioBackend::can_change_buffer_size_when_running () const
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{
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return false;
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return true;
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}
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int
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DummyAudioBackend::set_device_name (const std::string&)
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{
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return -1;
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return 0;
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}
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int
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DummyAudioBackend::set_sample_rate (float)
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DummyAudioBackend::set_sample_rate (float sr)
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{
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return -1;
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if (sr <= 0) { return -1; }
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_samplerate = sr;
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engine.sample_rate_change (sr);
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return 0;
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}
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int
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DummyAudioBackend::set_buffer_size (uint32_t)
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DummyAudioBackend::set_buffer_size (uint32_t bs)
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{
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return -1;
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_audio_buffersize = bs;
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engine.buffer_size_change (bs);
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return 0;
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}
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int
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@ -157,13 +174,13 @@ DummyAudioBackend::device_name () const
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float
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DummyAudioBackend::sample_rate () const
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{
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return 0;
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return _samplerate;
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}
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uint32_t
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DummyAudioBackend::buffer_size () const
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{
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return 0;
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return _audio_buffersize;
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}
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bool
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@ -219,28 +236,74 @@ DummyAudioBackend::midi_option () const
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/* State Control */
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static void * pthread_process (void *arg)
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{
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DummyAudioBackend *d = static_cast<DummyAudioBackend *>(arg);
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d->main_process_thread ();
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pthread_exit (0);
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return 0;
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}
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int
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DummyAudioBackend::_start (bool /*for_latency_measurement*/)
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{
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return -1;
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if (_running) {
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PBD::error << _("DummyAudioBackend: already active.") << endmsg;
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return -1;
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}
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if (pthread_create (&_main_thread, NULL, pthread_process, this)) {
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PBD::error << _("DummyAudioBackend: cannot start.") << endmsg;
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}
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int timeout = 5000;
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while (!_running && --timeout > 0) { usleep (1000); }
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if (timeout == 0 || !_running) {
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PBD::error << _("DummyAudioBackend: failed to start process thread.") << endmsg;
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return -1;
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}
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if (engine.reestablish_ports ()) {
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PBD::error << _("DummyAudioBackend: Could not re-establish ports.") << endmsg;
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stop ();
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return -1;
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}
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engine.reconnect_ports ();
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return 0;
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}
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int
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DummyAudioBackend::stop ()
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{
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return -1;
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void *status;
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if (!_running) {
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return -1;
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}
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_running = false;
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if (pthread_join (_main_thread, &status)) {
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PBD::error << _("DummyAudioBackend: failed to terminate.") << endmsg;
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return -1;
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}
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return 0;
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}
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int
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DummyAudioBackend::freewheel (bool)
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DummyAudioBackend::freewheel (bool onoff)
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{
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if (onoff != _freewheeling) {
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return 0;
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}
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_freewheeling = onoff;
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engine.freewheel_callback (onoff);
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return 0;
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}
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float
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DummyAudioBackend::dsp_load () const
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{
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return 0.0;
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return 100.f * _dsp_load;
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}
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size_t
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@ -253,13 +316,13 @@ DummyAudioBackend::raw_buffer_size (DataType t)
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pframes_t
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DummyAudioBackend::sample_time ()
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{
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return 0;
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return _processed_samples;
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}
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pframes_t
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DummyAudioBackend::sample_time_at_cycle_start ()
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{
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return 0;
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return _processed_samples;
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}
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pframes_t
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@ -268,28 +331,76 @@ DummyAudioBackend::samples_since_cycle_start ()
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return 0;
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}
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void *
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DummyAudioBackend::dummy_process_thread (void *arg)
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{
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ThreadData* td = reinterpret_cast<ThreadData*> (arg);
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boost::function<void ()> f = td->f;
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delete td;
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f ();
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return 0;
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}
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int
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DummyAudioBackend::create_process_thread (boost::function<void()> func)
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{
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return -1;
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pthread_t thread_id;
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pthread_attr_t attr;
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size_t stacksize = 100000;
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pthread_attr_init (&attr);
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pthread_attr_setstacksize (&attr, stacksize);
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ThreadData* td = new ThreadData (this, func, stacksize);
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if (pthread_create (&thread_id, &attr, dummy_process_thread, td)) {
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PBD::error << _("AudioEngine: cannot create process thread.") << endmsg;
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return -1;
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}
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_threads.push_back (thread_id);
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return 0;
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}
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int
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DummyAudioBackend::join_process_threads ()
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{
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return -1;
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int rv = 0;
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for (std::vector<pthread_t>::const_iterator i = _threads.begin (); i != _threads.end (); ++i)
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{
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void *status;
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if (pthread_join (*i, &status)) {
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PBD::error << _("AudioEngine: cannot terminate process thread.") << endmsg;
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rv -= 1;
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}
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}
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_threads.clear ();
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return rv;
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}
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bool
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DummyAudioBackend::in_process_thread ()
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{
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for (std::vector<pthread_t>::const_iterator i = _threads.begin (); i != _threads.end (); ++i)
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{
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#ifdef COMPILER_MINGW
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if (*i == GetCurrentThread ()) {
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return true;
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}
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#else // pthreads
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if (pthread_equal (*i, pthread_self ()) != 0) {
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return true;
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}
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#endif
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}
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return false;
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}
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uint32_t
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DummyAudioBackend::process_thread_count ()
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{
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return 0;
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return _threads.size ();
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}
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void
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@ -533,6 +644,40 @@ DummyAudioBackend::n_physical_inputs () const
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void*
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DummyAudioBackend::get_buffer (PortEngine::PortHandle, pframes_t)
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{
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}
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/* Engine Process */
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void *
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DummyAudioBackend::main_process_thread ()
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{
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AudioEngine::thread_init_callback (this);
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_running = true;
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_processed_samples = 0;
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struct timeval clock1, clock2;
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::gettimeofday (&clock1, NULL);
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while (_running) {
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if (engine.process_callback (_audio_buffersize)) {
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return 0;
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}
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_processed_samples += _audio_buffersize;
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if (!_freewheeling) {
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::gettimeofday (&clock2, NULL);
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const int elapsed_time = (clock2.tv_sec - clock1.tv_sec) * 1000000 + (clock2.tv_usec - clock1.tv_usec);
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const int nomial_time = 1000000 * _audio_buffersize / _samplerate;
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_dsp_load = elapsed_time / (float) nomial_time;
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if (elapsed_time < nomial_time) {
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::usleep (nomial_time - elapsed_time);
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} else {
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::usleep (100); // don't hog cpu
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}
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} else {
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_dsp_load = 1.0;
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::usleep (100); // don't hog cpu
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}
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::gettimeofday (&clock1, NULL);
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}
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_running = false;
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return 0;
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}
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@ -26,6 +26,7 @@
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#include <set>
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#include <stdint.h>
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#include <pthread.h>
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#include "ardour/types.h"
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#include "ardour/audio_backend.h"
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@ -159,9 +160,39 @@ class DummyAudioBackend : public AudioBackend {
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void* get_buffer (PortHandle, pframes_t);
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void* main_process_thread ();
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private:
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std::string _instance_name;
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bool _running;
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bool _freewheeling;
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float _samplerate;
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size_t _audio_buffersize;
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float _dsp_load;
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uint32_t _n_inputs;
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uint32_t _n_outputs;
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uint32_t _systemic_input_latency;
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uint32_t _systemic_output_latency;
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uint64_t _processed_samples;
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pthread_t _main_thread;
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/* process threads */
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static void* dummy_process_thread (void *);
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std::vector<pthread_t> _threads;
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struct ThreadData {
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DummyAudioBackend* engine;
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boost::function<void ()> f;
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size_t stacksize;
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ThreadData (DummyAudioBackend* e, boost::function<void ()> fp, size_t stacksz)
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: engine (e) , f (fp) , stacksize (stacksz) {}
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};
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}; // class DummyAudioBackend
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} // namespace
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