Reestablish libmidi++ JACK ports on jack reconnection, so that control MIDI can still be sent after a JACK disconnect/reconnect. Fixes remainder of #3301.

git-svn-id: svn://localhost/ardour2/branches/3.0@7373 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/ardour/audioengine.cc

@@ -34,6 +34,7 @@
 
 #include "midi++/jack.h"
 #include "midi++/mmc.h"
+#include "midi++/manager.h"
 
 #include "ardour/amp.h"
 #include "ardour/audio_port.h"
@@ -1395,6 +1396,8 @@ AudioEngine::reconnect_to_jack ()
 
 	GET_PRIVATE_JACK_POINTER_RET (_jack,-1);
 
+	MIDI::Manager::instance()->reestablish (_priv_jack);
+	
 	if (_session) {
 		_session->reset_jack_connection (_priv_jack);
                 jack_bufsize_callback (jack_get_buffer_size (_priv_jack));
@@ -1435,6 +1438,8 @@ AudioEngine::reconnect_to_jack ()
 		(*i)->reconnect ();
 	}
 
+	MIDI::Manager::instance()->reconnect ();
+
 	Running (); /* EMIT SIGNAL*/
 
 	start_metering_thread ();

libs/midi++2/jack_midiport.cc

@@ -268,13 +268,26 @@ JACK_MidiPort::create_ports(const XMLNode& node)
 	assert(!_jack_input_port);
 	assert(!_jack_output_port);
 	
-	jack_nframes_t nframes = jack_get_buffer_size(_jack_client);
+	if (desc.mode == O_RDWR || desc.mode == O_WRONLY) {
+		_jack_output_port_name = string(desc.tag).append ("_out");
+	}
 
+	if (desc.mode == O_RDWR || desc.mode == O_RDONLY) {
+		_jack_input_port_name = string(desc.tag).append ("_in");
+	}
+
+	return create_ports ();
+}
+
+int
+JACK_MidiPort::create_ports ()
+{
 	bool ret = true;
 
-	if (desc.mode == O_RDWR || desc.mode == O_WRONLY) {
-		_jack_output_port = jack_port_register(_jack_client,
-						       string(desc.tag).append("_out").c_str(),
+	jack_nframes_t nframes = jack_get_buffer_size(_jack_client);
+
+	if (!_jack_output_port_name.empty()) {
+		_jack_output_port = jack_port_register(_jack_client, _jack_output_port_name.c_str(),
 						       JACK_DEFAULT_MIDI_TYPE, JackPortIsOutput, 0);
 		if (_jack_output_port) {
 			jack_midi_clear_buffer(jack_port_get_buffer(_jack_output_port, nframes));
@@ -282,9 +295,8 @@ JACK_MidiPort::create_ports(const XMLNode& node)
 		ret = ret && (_jack_output_port != NULL);
 	}
 	
-	if (desc.mode == O_RDWR || desc.mode == O_RDONLY) {
-		_jack_input_port = jack_port_register(_jack_client,
-						      string(desc.tag).append("_in").c_str(),
+	if (!_jack_input_port_name.empty()) {
+		_jack_input_port = jack_port_register(_jack_client, _jack_input_port_name.c_str(),
 						      JACK_DEFAULT_MIDI_TYPE, JackPortIsInput, 0);
 		if (_jack_input_port) {
 			jack_midi_clear_buffer(jack_port_get_buffer(_jack_input_port, nframes));
@@ -402,3 +414,20 @@ JACK_MidiPort::is_process_thread()
 {
 	return (pthread_self() == _process_thread);
 }
+
+void
+JACK_MidiPort::reestablish (void* jack)
+{
+	_jack_client = static_cast<jack_client_t*> (jack);
+	int const r = create_ports ();
+
+	if (r) {
+		PBD::error << "could not reregister ports for " << name() << endmsg;
+	}
+}
+
+void
+JACK_MidiPort::reconnect ()
+{
+	make_connections ();
+}

libs/midi++2/manager.cc

@@ -234,3 +234,21 @@ Manager::get_known_ports (vector<PortSet>& ports)
 {
 	return PortFactory::get_known_ports (ports);
 }
+
+/** Re-register ports that disappear on JACK shutdown */
+void
+Manager::reestablish (void* a)
+{
+	for (PortList::const_iterator p = _ports.begin(); p != _ports.end(); ++p) {
+		(*p)->reestablish (a);
+	}
+}
+
+/** Re-connect ports after a reestablish () */
+void
+Manager::reconnect ()
+{
+	for (PortList::const_iterator p = _ports.begin(); p != _ports.end(); ++p) {
+		(*p)->reconnect ();
+	}
+}

libs/midi++2/midi++/jack.h

@@ -71,6 +71,9 @@ public:
 	
 	nframes_t nframes_this_cycle() const {	return _nframes_this_cycle; }
 
+	void reestablish (void *);
+	void reconnect ();
+
 	static PBD::Signal0<void> MakeConnections;
 	static PBD::Signal0<void> JackHalted;
 
@@ -81,9 +84,12 @@ public:
 
 private:
 	int create_ports(const XMLNode&);
+	int create_ports ();
 
 	jack_client_t* _jack_client;
+	std::string    _jack_input_port_name; /// input port name, or empty if there isn't one
 	jack_port_t*   _jack_input_port;
+	std::string    _jack_output_port_name; /// output port name, or empty if there isn't one
 	jack_port_t*   _jack_output_port;
 	nframes_t      _last_read_index;
 	timestamp_t    _last_write_timestamp;

libs/midi++2/midi++/manager.h

@@ -83,6 +83,9 @@ class Manager {
 
 	int get_known_ports (std::vector<PortSet>&);
 
+	void reestablish (void *);
+	void reconnect ();
+
 	PBD::Signal0<void> PortsChanged;
 
   private:

libs/midi++2/midi++/port.h

@@ -157,6 +157,9 @@ class Port {
 	    XMLNode& get_state();
 	};
 
+	virtual void reestablish (void *) {}
+	virtual void reconnect () {}
+
   protected:
 	bool             _ok;
 	bool             _currently_in_cycle;