add libardour code for going completely silent after a compile-time defined number of seconds
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@ -232,6 +232,16 @@ class LIBARDOUR_API AudioEngine : public SessionHandlePtr, public PortManager
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LatencyMeasurement measuring_latency () const { return _measuring_latency; }
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/* These two are used only in builds where SILENCE_AFTER_SECONDS was
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* set. BecameSilent will be emitted when the audioengine goes silent.
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* reset_silence_countdown() can be used to reset the silence
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* countdown, whose duration will be reduced to half of its previous
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* value.
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*/
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PBD::Signal0<void> BecameSilent;
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void reset_silence_countdown ();
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private:
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AudioEngine ();
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@ -293,6 +303,12 @@ class LIBARDOUR_API AudioEngine : public SessionHandlePtr, public PortManager
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BackendMap _backends;
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AudioBackendInfo* backend_discover (const std::string&);
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void drop_backend ();
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#ifdef SILENCE_AFTER
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framecnt_t _silence_countdown;
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uint32_t _silence_hit_cnt;
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#endif
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};
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} // namespace ARDOUR
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@ -559,7 +559,6 @@ class LIBARDOUR_API Session : public PBD::StatefulDestructible, public PBD::Scop
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bool transport_stopped() const { return _transport_speed == 0.0f; }
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bool transport_rolling() const { return _transport_speed != 0.0f; }
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void set_silent (bool yn);
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bool silent () { return _silent; }
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TempoMap& tempo_map() { return *_tempo_map; }
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@ -23,6 +23,7 @@
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#include <exception>
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#include <stdexcept>
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#include <sstream>
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#include <cmath>
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#include <glibmm/timer.h>
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#include <glibmm/pattern.h>
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@ -63,6 +64,10 @@ using namespace PBD;
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gint AudioEngine::m_meter_exit;
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AudioEngine* AudioEngine::_instance = 0;
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#ifdef SILENCE_AFTER
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#define SILENCE_AFTER_SECONDS 10
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#endif
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AudioEngine::AudioEngine ()
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: session_remove_pending (false)
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, session_removal_countdown (-1)
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@ -89,9 +94,14 @@ AudioEngine::AudioEngine ()
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, _hw_devicelist_update_thread(0)
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, _hw_devicelist_update_count(0)
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, _stop_hw_devicelist_processing(0)
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#ifdef SILENCE_AFTER_SECONDS
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, _silence_countdown (0)
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, _silence_hit_cnt (0)
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#endif
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{
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g_atomic_int_set (&m_meter_exit, 0);
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start_hw_event_processing();
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reset_silence_countdown ();
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start_hw_event_processing();
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discover_backends ();
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}
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@ -148,6 +158,10 @@ AudioEngine::sample_rate_change (pframes_t nframes)
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SampleRateChanged (nframes); /* EMIT SIGNAL */
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#ifdef SILENCE_AFTER_SECONDS
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_silence_countdown = nframes * SILENCE_AFTER_SECONDS;
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#endif
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return 0;
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}
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@ -349,10 +363,31 @@ AudioEngine::process_callback (pframes_t nframes)
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last_monitor_check = next_processed_frames;
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}
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#ifdef SILENCE_AFTER_SECONDS
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bool was_silent = (_silence_countdown == 0);
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if (_silence_countdown >= nframes) {
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_silence_countdown -= nframes;
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} else {
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_silence_countdown = 0;
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}
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if (!was_silent && _silence_countdown == 0) {
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_silence_hit_cnt++;
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BecameSilent (); /* EMIT SIGNAL */
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}
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if (_silence_countdown == 0 || _session->silent()) {
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PortManager::silence (nframes);
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}
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#else
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if (_session->silent()) {
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PortManager::silence (nframes);
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}
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#endif
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if (session_remove_pending && session_removal_countdown) {
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PortManager::fade_out (session_removal_gain, session_removal_gain_step, nframes);
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@ -375,6 +410,19 @@ AudioEngine::process_callback (pframes_t nframes)
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return 0;
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}
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void
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AudioEngine::reset_silence_countdown ()
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{
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#ifdef SILENCE_AFTER_SECONDS
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double sr = 48000; /* default in case there is no backend */
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sr = sample_rate();
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_silence_countdown = max (60 * sr, /* 60 seconds */
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sr * (SILENCE_AFTER_SECONDS / pow (2, _silence_hit_cnt)));
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#endif
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}
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void
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AudioEngine::launch_device_control_app()
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@ -1081,6 +1129,7 @@ AudioEngine::set_sample_rate (float sr)
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if (!_backend) {
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return -1;
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}
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return _backend->set_sample_rate (sr);
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}
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