Propagate Latency to backend/system ports (Dummy backend)

amend ab3889ff (which implements this for other backends)

2 files changed, 53 insertions, 11 deletions

diff --git a/libs/backends/dummy/dummy_audiobackend.cc b/libs/backends/dummy/dummy_audiobackend.cc
index 825add2c94..3993c82f1b 100644
--- a/libs/backends/dummy/dummy_audiobackend.cc
+++ b/libs/backends/dummy/dummy_audiobackend.cc
@@ -956,6 +956,24 @@ DummyAudioBackend::unregister_ports (bool system_only)
 	}
 }
 
+void
+DummyAudioBackend::update_system_port_latecies ()
+{
+	for (std::vector<DummyAudioPort*>::const_iterator it = _system_inputs.begin (); it != _system_inputs.end (); ++it) {
+		(*it)->update_connected_latency (true);
+	}
+	for (std::vector<DummyAudioPort*>::const_iterator it = _system_outputs.begin (); it != _system_outputs.end (); ++it) {
+		(*it)->update_connected_latency (false);
+	}
+
+	for (std::vector<DummyMidiPort*>::const_iterator it = _system_midi_in.begin (); it != _system_midi_in.end (); ++it) {
+		(*it)->update_connected_latency (true);
+	}
+	for (std::vector<DummyMidiPort*>::const_iterator it = _system_midi_out.begin (); it != _system_midi_out.end (); ++it) {
+		(*it)->update_connected_latency (false);
+	}
+}
+
 int
 DummyAudioBackend::connect (const std::string& src, const std::string& dst)
 {
@@ -1400,6 +1418,7 @@ DummyAudioBackend::main_process_thread ()
 			manager.graph_order_callback();
 		}
 		if (connections_changed || ports_changed) {
+			update_system_port_latecies ();
 			engine.latency_callback(false);
 			engine.latency_callback(true);
 		}
@@ -1600,6 +1619,36 @@ bool DummyPort::is_physically_connected () const
 	return false;
 }
 
+void
+DummyPort::set_latency_range (const LatencyRange &latency_range, bool for_playback)
+{
+	if (for_playback) {
+		_playback_latency_range = latency_range;
+	} else {
+		_capture_latency_range = latency_range;
+	}
+
+	for (std::set<DummyPort*>::const_iterator it = _connections.begin (); it != _connections.end (); ++it) {
+		if ((*it)->is_physical ()) {
+			(*it)->update_connected_latency (is_input ());
+		}
+	}
+}
+
+void
+DummyPort::update_connected_latency (bool for_playback)
+{
+	LatencyRange lr;
+	lr.min = lr.max = 0;
+	for (std::set<DummyPort*>::const_iterator it = _connections.begin (); it != _connections.end (); ++it) {
+		LatencyRange l;
+		l = (*it)->latency_range (for_playback);
+		lr.min = std::max (lr.min, l.min);
+		lr.max = std::max (lr.max, l.max);
+	}
+	set_latency_range (lr, for_playback);
+}
+
 void DummyPort::setup_random_number_generator ()
 {
 #ifdef PLATFORM_WINDOWS
diff --git a/libs/backends/dummy/dummy_audiobackend.h b/libs/backends/dummy/dummy_audiobackend.h
index 4bd4078ec5..48e588d364 100644
--- a/libs/backends/dummy/dummy_audiobackend.h
+++ b/libs/backends/dummy/dummy_audiobackend.h
@@ -106,17 +106,9 @@ class DummyPort {
 			return for_playback ? _playback_latency_range : _capture_latency_range;
 		}
 
-		void set_latency_range (const LatencyRange &latency_range, bool for_playback)
-		{
-			if (for_playback)
-			{
-				_playback_latency_range = latency_range;
-			}
-			else
-			{
-				_capture_latency_range = latency_range;
-			}
-		}
+		void set_latency_range (const LatencyRange &latency_range, bool for_playback);
+
+		void update_connected_latency (bool for_playback);
 
 	private:
 		DummyAudioBackend &_dummy_backend;
@@ -456,6 +448,7 @@ class DummyAudioBackend : public AudioBackend {
 		PortHandle add_port (const std::string& shortname, ARDOUR::DataType, ARDOUR::PortFlags);
 		int register_system_ports ();
 		void unregister_ports (bool system_only = false);
+		void update_system_port_latecies ();
 
 		std::vector<DummyAudioPort *> _system_inputs;
 		std::vector<DummyAudioPort *> _system_outputs;