livetrax/libs/surfaces/mackie/mackie_control_protocol.h

/*
	Copyright (C) 2006,2007 John Anderson

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef ardour_mackie_control_protocol_h
#define ardour_mackie_control_protocol_h

#include <vector>

#include <sys/time.h>
#include <pthread.h>

#include <glibmm/thread.h>

#include <ardour/types.h>
#include <ardour/session.h>
#include <midi++/types.h>

#include <control_protocol/control_protocol.h>
#include "midi_byte_array.h"
#include "controls.h"
#include "route_signal.h"
#include "mackie_button_handler.h"
#include "mackie_port.h"

namespace MIDI {
	class Port;
	class Parser;
}

namespace Mackie {
	class Surface;
}

/**
	This handles the plugin duties, and the midi encoding and decoding,
	and the signal callbacks, mostly from ARDOUR::Route.

	The model of the control surface is handled by classes in controls.h

	What happens is that each strip on the control surface has
	a corresponding route in ControlProtocol::route_table. When
	an incoming midi message is signaled, the correct route
	is looked up, and the relevant changes made to it.

	For each route currently in route_table, there's a RouteSignal object
	which encapsulates the signals that indicate that there are changes
	to be sent to the surface. The signals are handled by this class.

	Calls to signal handlers pass a Route object which is used to look
	up the relevant Strip in Surface. Then the state is retrieved from
	the Route and encoded as the correct midi message.
*/
class MackieControlProtocol
: public ARDOUR::ControlProtocol
, public Mackie::MackieButtonHandler
{
  public:
	MackieControlProtocol( ARDOUR::Session & );
	virtual ~MackieControlProtocol();

	int set_active (bool yn);

	XMLNode& get_state ();
	int set_state (const XMLNode&);
  
	static bool probe();
	
	Mackie::Surface & surface();

   // control events
   void handle_control_event( Mackie::SurfacePort & port, Mackie::Control & control, const Mackie::ControlState & state );

  // strip/route related stuff
  public:	
	/// Signal handler for Route::solo
	void notify_solo_changed( Mackie::RouteSignal * );
	/// Signal handler for Route::mute
	void notify_mute_changed( Mackie::RouteSignal * );
	/// Signal handler for Route::record_enable_changed
	void notify_record_enable_changed( Mackie::RouteSignal * );
	/// Signal handler for Route::gain_changed ( from IO )
	void notify_gain_changed( Mackie::RouteSignal * );
	/// Signal handler for Route::name_change
	void notify_name_changed( Mackie::RouteSignal * );
	/// Signal handler from Panner::Change
	void notify_panner_changed( Mackie::RouteSignal * );
	/// Signal handler for new routes added
	void notify_route_added( ARDOUR::Session::RouteList & );

	void notify_remote_id_changed();

	/// rebuild the current bank. Called on route added/removed and
   /// remote id changed.
	void refresh_current_bank();

  // global buttons (ie button not part of strips)
  public:
   // button-related signals
	void notify_record_state_changed();
   void notify_transport_state_changed();
   // mainly to pick up punch-in and punch-out
	void notify_parameter_changed( const char * );
   void notify_solo_active_changed( bool );

	// this is called to generate the midi to send in response to
   // a button press.
	void update_led( Mackie::Button & button, Mackie::LedState );
  
	// calls update_led, but looks up the button by name
	void update_global_button( const std::string & name, Mackie::LedState );
  
   // transport button handler methods from MackieButtonHandler
	virtual Mackie::LedState frm_left_press( Mackie::Button & );
	virtual Mackie::LedState frm_left_release( Mackie::Button & );

	virtual Mackie::LedState frm_right_press( Mackie::Button & );
	virtual Mackie::LedState frm_right_release( Mackie::Button & );

	virtual Mackie::LedState stop_press( Mackie::Button & );
	virtual Mackie::LedState stop_release( Mackie::Button & );

	virtual Mackie::LedState play_press( Mackie::Button & );
	virtual Mackie::LedState play_release( Mackie::Button & );

	virtual Mackie::LedState record_press( Mackie::Button & );
	virtual Mackie::LedState record_release( Mackie::Button & );

	virtual Mackie::LedState loop_press( Mackie::Button & );
	virtual Mackie::LedState loop_release( Mackie::Button & );

	virtual Mackie::LedState punch_in_press( Mackie::Button & );
	virtual Mackie::LedState punch_in_release( Mackie::Button & );

	virtual Mackie::LedState punch_out_press( Mackie::Button & );
	virtual Mackie::LedState punch_out_release( Mackie::Button & );

	virtual Mackie::LedState home_press( Mackie::Button & );
	virtual Mackie::LedState home_release( Mackie::Button & );

	virtual Mackie::LedState end_press( Mackie::Button & );
	virtual Mackie::LedState end_release( Mackie::Button & );
	
	virtual Mackie::LedState rewind_press( Mackie::Button & button );
	virtual Mackie::LedState rewind_release( Mackie::Button & button );

	virtual Mackie::LedState ffwd_press( Mackie::Button & button );
	virtual Mackie::LedState ffwd_release( Mackie::Button & button );

	// bank switching button handler methods from MackieButtonHandler
	virtual Mackie::LedState left_press( Mackie::Button & );
	virtual Mackie::LedState left_release( Mackie::Button & );

	virtual Mackie::LedState right_press( Mackie::Button & );
	virtual Mackie::LedState right_release( Mackie::Button & );

	virtual Mackie::LedState channel_left_press( Mackie::Button & );
	virtual Mackie::LedState channel_left_release( Mackie::Button & );

	virtual Mackie::LedState channel_right_press( Mackie::Button & );
	virtual Mackie::LedState channel_right_release( Mackie::Button & );
	
	virtual Mackie::LedState clicking_press( Mackie::Button & );
	virtual Mackie::LedState clicking_release( Mackie::Button & );
	
	virtual Mackie::LedState global_solo_press( Mackie::Button & );
	virtual Mackie::LedState global_solo_release( Mackie::Button & );
	
	// function buttons
	virtual Mackie::LedState marker_press( Mackie::Button & );
	virtual Mackie::LedState marker_release( Mackie::Button & );

  protected:
	// create instances of MackiePort, depending on what's found in ardour.rc
	void create_ports();
  
	// shut down the surface
	void close();
  
	// create the Surface object, with the correct number
	// of strips for the currently connected ports and 
	// hook up the control event notification
	void initialize_surface();
  
	// This sets up the notifications and sets the
   // controls to the correct values
	void update_surface();
  
   // connects global (not strip) signals from the Session to here
   // so the surface can be notified of changes from the other UIs.
   void connect_session_signals();
  
   // set all controls to their zero position
	void zero_all();
	
	/**
		Fetch the set of routes to be considered for control by the
		surface. Excluding master, hidden and control routes, and inactive routes
	*/
	typedef std::vector<boost::shared_ptr<ARDOUR::Route> > Sorted;
	Sorted get_sorted_routes();
  
   // bank switching
   void switch_banks( int initial );
   void prev_track();
   void next_track();
  
   // delete all RouteSignal objects connecting Routes to Strips
   void clear_route_signals();
	
   /// This is the main MCU port, ie not an extender port
	const Mackie::MackiePort & mcu_port() const;
	Mackie::MackiePort & mcu_port();
 
	typedef std::vector<Mackie::RouteSignal*> RouteSignals;
	RouteSignals route_signals;
	
   // return which of the ports a particular route_table
   // index belongs to
	Mackie::MackiePort & port_for_id( uint32_t index );

	/**
		Handle a button press for the control and return whether
		the corresponding light should be on or off.
	*/
	bool handle_strip_button( Mackie::Control &, Mackie::ButtonState, boost::shared_ptr<ARDOUR::Route> );

	/// thread started. Calls monitor_work.
	static void* _monitor_work (void* arg);
	
	/// Polling midi port(s) for incoming messages
	void* monitor_work ();
	
	/// rebuild the set of ports for this surface
	void update_ports();
	
	/// Returns true if there is pending data, false otherwise
	bool poll_ports();
	
	/// Trigger the MIDI::Parser
	void read_ports();

	void add_port( MIDI::Port &, int number );

	/// read automation data from the currently active routes and send to surface
	void poll_automation();
	
	// called from poll_automation to figure out which automations need to be sent
	void update_automation( Mackie::RouteSignal & );

	/**
		notification that the port is about to start it's init sequence.
		We must make sure that before this exits, the port is being polled
		for new data.
	*/
	void handle_port_init( Mackie::SurfacePort * );

	/// notification from a MackiePort that it's now active
	void handle_port_active( Mackie::SurfacePort * );
	
	/// notification from a MackiePort that it's now inactive
	void handle_port_inactive( Mackie::SurfacePort * );
	
	boost::shared_ptr<ARDOUR::Route> master_route();
	Mackie::Strip & master_strip();

  private:
	boost::shared_ptr<Mackie::RouteSignal> master_route_signal;
  
   static const char * default_port_name;
  
	/// The Midi port(s) connected to the units
	typedef vector<Mackie::MackiePort*> MackiePorts;
	MackiePorts _ports;
  
   // the thread that polls the ports for incoming midi data
	pthread_t thread;
  
	/// The initial remote_id of the currently switched in bank.
   uint32_t _current_initial_bank;
	
   /// protects the port list, and polling structures
	Glib::Mutex update_mutex;
  
	/// Protects set_active, and allows waiting on the poll thread
	Glib::Cond update_cond;

	// because sigc::trackable doesn't seem to be working
	std::vector<sigc::connection> _connections;
	std::back_insert_iterator<std::vector<sigc::connection> > connections_back;

   /// The representation of the physical controls on the surface.
  	Mackie::Surface * _surface;
	
	/// If a port is opened or closed, this will be
	/// true until the port configuration is updated;
	bool _ports_changed;

	bool _polling;
	struct pollfd * pfd;
	int nfds;
	
	bool _transport_previously_rolling;
};

#endif // ardour_mackie_control_protocol_h