* added Menu for sending midi clock

* hooked up MidiClockTicker to the session


git-svn-id: svn://localhost/ardour2/branches/3.0@4267 d708f5d6-7413-0410-9779-e7cbd77b26cf

gtk2_ardour/ardour.menus

@@ -430,6 +430,7 @@
                </menu>
 	       <menu action='SyncMenu'>
                	     <menuitem action='SendMTC'/>
+               	     <menuitem action='SendMidiClock'/>
                	     <menuitem action='SendMMC'/>
                	     <menuitem action='UseMMC'/>
 	       </menu>

gtk2_ardour/ardour_ui.h

@@ -701,6 +701,7 @@ class ARDOUR_UI : public Gtkmm2ext::UI
 	void toggle_use_mmc ();
 	void toggle_send_mmc ();
 	void toggle_send_mtc ();
+	void toggle_send_midi_clock ();
 
 	void toggle_use_osc ();
 

gtk2_ardour/ardour_ui_ed.cc

@@ -436,6 +436,8 @@ ARDOUR_UI::install_actions ()
 	ActionManager::session_sensitive_actions.push_back (act);
 	act = ActionManager::register_toggle_action (option_actions, X_("UseMMC"), _("Use MMC"), mem_fun (*this, &ARDOUR_UI::toggle_use_mmc));
 	ActionManager::session_sensitive_actions.push_back (act);
+	act = ActionManager::register_toggle_action (option_actions, X_("SendMidiClock"), _("Send MIDI Clock"), mem_fun (*this, &ARDOUR_UI::toggle_send_midi_clock));
+	ActionManager::session_sensitive_actions.push_back (act);
 	act = ActionManager::register_toggle_action (option_actions, X_("SendMIDIfeedback"), _("Send MIDI feedback"), mem_fun (*this, &ARDOUR_UI::toggle_send_midi_feedback));
 	ActionManager::session_sensitive_actions.push_back (act);
 

gtk2_ardour/ardour_ui_options.cc

@@ -61,6 +61,12 @@ ARDOUR_UI::toggle_send_mmc ()
 	ActionManager::toggle_config_state ("options", "SendMMC", &Configuration::set_send_mmc, &Configuration::get_send_mmc);
 }
 
+void
+ARDOUR_UI::toggle_send_midi_clock ()
+{
+	ActionManager::toggle_config_state ("options", "SendMidiClock", &Configuration::set_send_midi_clock, &Configuration::get_send_midi_clock);
+}
+
 void
 ARDOUR_UI::toggle_use_mmc ()
 {

libs/ardour/ardour/configuration_vars.h

@@ -35,6 +35,7 @@ CONFIG_VARIABLE (bool, trace_midi_input, "trace-midi-input", false)
 CONFIG_VARIABLE (bool, trace_midi_output, "trace-midi-output", false)
 CONFIG_VARIABLE (bool, send_mtc, "send-mtc", false)
 CONFIG_VARIABLE (bool, send_mmc, "send-mmc", true)
+CONFIG_VARIABLE (bool, send_midi_clock, "send-midi-clock", false)
 CONFIG_VARIABLE (bool, mmc_control, "mmc-control", true)
 CONFIG_VARIABLE (bool, midi_feedback, "midi-feedback", false)
 CONFIG_VARIABLE (uint8_t, mmc_receive_device_id, "mmc-receive-device-id", 0)

libs/ardour/ardour/ticker.h

@@ -17,6 +17,7 @@
 
     $Id$
 */
+
 #include <sigc++/sigc++.h>
 
 #include "ardour/types.h"
@@ -42,31 +43,36 @@ public:
 		const SMPTE::Time& transport_smpte) = 0;
 	
 	virtual void set_session(Session& s);
-	virtual void going_away() { _session = 0; }
+	virtual void going_away() { _session = 0;  delete this; }
 
-private:
+protected:
 	Session* _session;
 };
 
 class MidiClockTicker : public Ticker
 {
-	MidiClockTicker() : _jack_port(0) {};
+public:
+	MidiClockTicker() : _jack_port(0), _ppqn(24) {};
 	virtual ~MidiClockTicker() {};
 	
-	
 	void tick(
 		const nframes_t& transport_frames, 
 		const BBT_Time& transport_bbt, 
 		const SMPTE::Time& transport_smpte);
 	
-	
+	void set_session(Session& s);
 	void going_away() { Ticker::going_away(); _jack_port = 0;}
 	
-	void set_midi_port(MIDI::JACK_MidiPort &port);
+	/// slot for the signal session::MIDIClock_PortChanged
+	void update_midi_clock_port();
+	
+	/// pulses per quarter note (default 24)
+	void set_ppqn(int ppqn) { _ppqn = ppqn; }
 
 private:	
 	MIDI::JACK_MidiPort* _jack_port;
-	
+	nframes_t            _last_tick;
+	int                  _ppqn;
 };
 
 }

libs/ardour/session_state.cc

@@ -101,6 +101,7 @@
 #include <ardour/filename_extensions.h>
 #include <ardour/directory_names.h>
 #include <ardour/template_utils.h>
+#include <ardour/ticker.h>
 
 #include <control_protocol/control_protocol.h>
 
@@ -357,6 +358,9 @@ Session::second_stage_init (bool new_session)
 	_engine.transport_locate (0);
 	deliver_mmc (MIDI::MachineControl::cmdMmcReset, 0);
 	deliver_mmc (MIDI::MachineControl::cmdLocate, 0);
+	
+	MidiClockTicker* midi_clock_ticker = new MidiClockTicker();
+	midi_clock_ticker->set_session(*this);
 
 	BootMessage (_("Reset Control Protocols"));
 

libs/ardour/ticker.cc

@@ -17,8 +17,10 @@
 
     $Id$
 */
+
 #include "ardour/ticker.h"
 #include "ardour/session.h"
+#include "ardour/tempo.h"
 
 namespace ARDOUR
 {
@@ -34,10 +36,45 @@ void Ticker::set_session(Session& s)
 	 }
 }
 
+void MidiClockTicker::set_session(Session& s) 
+{
+	 Ticker::set_session(s);
+	 
+	 if(_session) {
+		 _session->MIDIClock_PortChanged.connect(mem_fun (*this, &MidiClockTicker::update_midi_clock_port));
+		 update_midi_clock_port();
+	 }
+}
+
+void MidiClockTicker::update_midi_clock_port()
+{
+	 _jack_port = (MIDI::JACK_MidiPort*) _session->midi_clock_port();
+}
 
 void MidiClockTicker::tick(const nframes_t& transport_frames, const BBT_Time& transport_bbt, const SMPTE::Time& transport_smpt)
-{
+{	
+	if (!Config->get_send_midi_clock() || _session == 0 || _session->transport_speed() != 1.0f)
+		return;
 	
+	const Tempo& current_tempo = _session->tempo_map().tempo_at(transport_frames);
+	const Meter& current_meter = _session->tempo_map().meter_at(transport_frames);
+	double frames_per_beat =
+		current_tempo.frames_per_beat(_session->nominal_frame_rate(),
+		                              current_meter);
+
+	double quarter_notes_per_beat = 4.0 / current_tempo.note_type();
+	double frames_per_quarter_note = frames_per_beat / quarter_notes_per_beat;
+
+	nframes_t one_ppqn_in_frames = frames_per_quarter_note / double (_ppqn);
+	
+	nframes_t next_tick = _last_tick + one_ppqn_in_frames;
+	nframes_t next_tick_offset = next_tick - transport_frames;
+	
+	assert(_jack_port->is_process_thread());
+	static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_TICK };
+	_jack_port->write(_midi_clock_tick, 1, next_tick_offset);
+	
+	_last_tick = next_tick;
 }
 
 }