drivers/midi/MidiInputDevice.h

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 - 2009 Christian Schoenebeck                       *
 *                                                                         *
 *   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., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#ifndef __LS_MIDIINPUTDEVICE_H__
#define __LS_MIDIINPUTDEVICE_H__

#include <stdexcept>
#include <set>
#include <map>
#include <vector>

#include "../../common/global.h"
#include "../../common/Exception.h"
#include "../DeviceParameter.h"
#include "MidiInputPort.h"
#include "../../engines/Engine.h"
#include "../../EventListeners.h"

namespace LinuxSampler {

    // just symbol prototyping
    class MidiInputPort;
    class Engine;
    class MidiInputDeviceFactory;

    /**
     * Midi input exception that should be thrown by the MidiInputDevice
     * descendants in case initialization of the MIDI input system failed
     * (which should be done in the constructor of the MidiInputDevice
     * descendant).
     */
    class MidiInputException : public Exception {
        public:
            MidiInputException(const std::string& msg) : Exception(msg) {}
    };

    /** Abstract base class for MIDI input drivers in LinuxSampler
     *
     * This class will be derived by specialized classes which implement the
     * connection to a specific MIDI input system (e.g. Alsa Sequencer,
     * CoreMIDI). The MidiInputDevice desendant should just call the
     * appropriate (protected) Dispatch* method here when an MIDI event
     * occured. The dispatch* methods here will automatically forward the
     * MIDI event to the appropriate, connected sampler engines.
     */
    class MidiInputDevice : public Device {
        public:

            /////////////////////////////////////////////////////////////////
            // type definitions

            /** Device Parameter 'ACTIVE'
             *
             * Used to activate / deactivate the MIDI input device.
             */
            class ParameterActive : public DeviceCreationParameterBool {
                public:
                    ParameterActive();
                    ParameterActive(String active);
                    virtual String Description();
                    virtual bool   Fix();
                    virtual bool   Mandatory();
                    virtual std::map<String,DeviceCreationParameter*> DependsAsParameters();
                    virtual optional<bool> DefaultAsBool(std::map<String,String> Parameters);
                    virtual void OnSetValue(bool b) throw (Exception);
                    static String Name();
            };

            /** Device Parameter 'PORTS'
             *
             * Used to increase / decrease the number of MIDI ports of the
             * MIDI input device.
             */
            class ParameterPorts : public DeviceCreationParameterInt {
                public:
                    ParameterPorts();
                    ParameterPorts(String val);
                    virtual String Description();
                    virtual bool   Fix();
                    virtual bool   Mandatory();
                    virtual std::map<String,DeviceCreationParameter*> DependsAsParameters();
                    virtual optional<int>    DefaultAsInt(std::map<String,String> Parameters);
                    virtual optional<int>    RangeMinAsInt(std::map<String,String> Parameters);
                    virtual optional<int>    RangeMaxAsInt(std::map<String,String> Parameters);
                    virtual std::vector<int> PossibilitiesAsInt(std::map<String,String> Parameters);
                    virtual void             OnSetValue(int i) throw (Exception);
                    static String Name();
            };


            /////////////////////////////////////////////////////////////////
            // abstract methods
            //     (these have to be implemented by the descendant)

            /**
             * Start listen to MIDI input events on the MIDI input port.
             * The MIDIInputPort descendant should forward all MIDI input
             * events by calling the appropriate (protected) Dispatch*
             * method of class MidiInputPort.
             */
            virtual void Listen() = 0;

            /**
             * Stop to listen to MIDI input events on the MIDI input port.
             * After this method was called, the MidiInputPort descendant
             * should ignore all MIDI input events.
             */
            virtual void StopListen() = 0;

            /**
             * Return device driver name
             */
            virtual String Driver() = 0;

            /**
             * Create new Midi port
             * This will be called by AcquirePorts
             * Each individual device must implement this.
             */
            virtual MidiInputPort* CreateMidiPort() = 0;


            /////////////////////////////////////////////////////////////////
            // normal methods
            //     (usually not to be overriden by descendant)

            /**
             * Return midi port \a iPort.
             *
             * @throws MidiInputException  if index out of bounds
             */
            MidiInputPort* GetPort(uint iPort) throw (MidiInputException);

            /**
             * Returns amount of MIDI ports this MIDI input device currently
             * provides.
             */
            uint PortCount();

            /**
             * Return all device parameter settings.
             */
            std::map<String,DeviceCreationParameter*> DeviceParameters();

            /**
             * Registers the specified listener to be notified
             * when the number of MIDI input ports is changed.
             */
            void AddMidiPortCountListener(MidiPortCountListener* l);

            /**
             * Removes the specified listener, to stop being notified of
             * further MIDI input port count chances.
             */
            void RemoveMidiPortCountListener(MidiPortCountListener* l);

        protected:
            std::map<String,DeviceCreationParameter*> Parameters;  ///< All device parameters.
            std::map<int,MidiInputPort*> Ports;                    ///< All MIDI ports.
            void* pSampler;                                        ///< Sampler instance. FIXME: should actually be of type Sampler*
            ListenerList<MidiPortCountListener*> portCountListeners;

            /**
             * Constructor
             *
             * FIXME: the pointer argument \a pSapmler should actually be of type Sampler*.
             * Unfortunately the bidirectional relationship between this
             * header and Sampler.h would clash on header file inclusion,
             * so that's why I had to make it of type void* here. This is
             * an annoying constraint of C++.
             */
            MidiInputDevice(std::map<String,DeviceCreationParameter*> DriverParameters, void* pSampler);

            /**
             * Destructor
             */
            virtual ~MidiInputDevice();

            /**
             * Notifies listeners that the amount of MIDI inpurt ports have
             * been changed.
             * @param NewCount The new number of MIDI input ports.
             */
            void fireMidiPortCountChanged(int NewCount);

            /**
             * Notifies listeners that the supplied MIDI input port is
             * going to be removed soon.
             * @param pPort The MIDI input port that is going to be removed.
             */
            void fireMidiPortToBeRemoved(MidiInputPort* pPort);

            /**
             * Notifies listeners that the supplied MIDI input port has
             * just been added.
             * @param pPort The MIDI input port that has been added.
             */
            void fireMidiPortAdded(MidiInputPort* pPort);

            /**
             * Set number of MIDI ports required by the engine
             * This can either do nothing, create more ports
             * or destroy ports depenging on the parameter
             * and how many ports already exist on this driver.
             *
             * @param Ports - number of ports to be left on this driver after this call.
             */
            void AcquirePorts(uint Ports);

            friend class ParameterActive;
            friend class ParameterPorts;
            friend class MidiInputDeviceFactory; // allow MidiInputDeviceFactory class to destroy midi devices
            friend class MidiInputPort; // allow MidiInputPort to access pSampler
    };
}

#endif // __LS_MIDIINPUTDEVICE_H__
1	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	* Copyright (C) 2005 - 2009 Christian Schoenebeck *
7	* *
8	* This program is free software; you can redistribute it and/or modify *
9	* it under the terms of the GNU General Public License as published by *
10	* the Free Software Foundation; either version 2 of the License, or *
11	* (at your option) any later version. *
12	* *
13	* This program is distributed in the hope that it will be useful, *
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16	* GNU General Public License for more details. *
17	* *
18	* You should have received a copy of the GNU General Public License *
19	* along with this program; if not, write to the Free Software *
20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21	* MA 02111-1307 USA *
22	***************************************************************************/
23
24	#ifndef __LS_MIDIINPUTDEVICE_H__
25	#define __LS_MIDIINPUTDEVICE_H__
26
27	#include <stdexcept>
28	#include <set>
29	#include <map>
30	#include <vector>
31
32	#include "../../common/global.h"
33	#include "../../common/Exception.h"
34	#include "../DeviceParameter.h"
35	#include "MidiInputPort.h"
36	#include "../../engines/Engine.h"
37	#include "../../EventListeners.h"
38
39	namespace LinuxSampler {
40
41	// just symbol prototyping
42	class MidiInputPort;
43	class Engine;
44	class MidiInputDeviceFactory;
45
46	/**
47	* Midi input exception that should be thrown by the MidiInputDevice
48	* descendants in case initialization of the MIDI input system failed
49	* (which should be done in the constructor of the MidiInputDevice
50	* descendant).
51	*/
52	class MidiInputException : public Exception {
53	public:
54	MidiInputException(const std::string& msg) : Exception(msg) {}
55	};
56
57	/** Abstract base class for MIDI input drivers in LinuxSampler
58	*
59	* This class will be derived by specialized classes which implement the
60	* connection to a specific MIDI input system (e.g. Alsa Sequencer,
61	* CoreMIDI). The MidiInputDevice desendant should just call the
62	* appropriate (protected) Dispatch* method here when an MIDI event
63	* occured. The dispatch* methods here will automatically forward the
64	* MIDI event to the appropriate, connected sampler engines.
65	*/
66	class MidiInputDevice : public Device {
67	public:
68
69	/////////////////////////////////////////////////////////////////
70	// type definitions
71
72	/** Device Parameter 'ACTIVE'
73	*
74	* Used to activate / deactivate the MIDI input device.
75	*/
76	class ParameterActive : public DeviceCreationParameterBool {
77	public:
78	ParameterActive();
79	ParameterActive(String active);
80	virtual String Description();
81	virtual bool Fix();
82	virtual bool Mandatory();
83	virtual std::map<String,DeviceCreationParameter*> DependsAsParameters();
84	virtual optional<bool> DefaultAsBool(std::map<String,String> Parameters);
85	virtual void OnSetValue(bool b) throw (Exception);
86	static String Name();
87	};
88
89	/** Device Parameter 'PORTS'
90	*
91	* Used to increase / decrease the number of MIDI ports of the
92	* MIDI input device.
93	*/
94	class ParameterPorts : public DeviceCreationParameterInt {
95	public:
96	ParameterPorts();
97	ParameterPorts(String val);
98	virtual String Description();
99	virtual bool Fix();
100	virtual bool Mandatory();
101	virtual std::map<String,DeviceCreationParameter*> DependsAsParameters();
102	virtual optional<int> DefaultAsInt(std::map<String,String> Parameters);
103	virtual optional<int> RangeMinAsInt(std::map<String,String> Parameters);
104	virtual optional<int> RangeMaxAsInt(std::map<String,String> Parameters);
105	virtual std::vector<int> PossibilitiesAsInt(std::map<String,String> Parameters);
106	virtual void OnSetValue(int i) throw (Exception);
107	static String Name();
108	};
109
110
111
112	/////////////////////////////////////////////////////////////////
113	// abstract methods
114	// (these have to be implemented by the descendant)
115
116	/**
117	* Start listen to MIDI input events on the MIDI input port.
118	* The MIDIInputPort descendant should forward all MIDI input
119	* events by calling the appropriate (protected) Dispatch*
120	* method of class MidiInputPort.
121	*/
122	virtual void Listen() = 0;
123
124	/**
125	* Stop to listen to MIDI input events on the MIDI input port.
126	* After this method was called, the MidiInputPort descendant
127	* should ignore all MIDI input events.
128	*/
129	virtual void StopListen() = 0;
130
131	/**
132	* Return device driver name
133	*/
134	virtual String Driver() = 0;
135
136	/**
137	* Create new Midi port
138	* This will be called by AcquirePorts
139	* Each individual device must implement this.
140	*/
141	virtual MidiInputPort* CreateMidiPort() = 0;
142
143
144
145	/////////////////////////////////////////////////////////////////
146	// normal methods
147	// (usually not to be overriden by descendant)
148
149	/**
150	* Return midi port \a iPort.
151	*
152	* @throws MidiInputException if index out of bounds
153	*/
154	MidiInputPort* GetPort(uint iPort) throw (MidiInputException);
155
156	/**
157	* Returns amount of MIDI ports this MIDI input device currently
158	* provides.
159	*/
160	uint PortCount();
161
162	/**
163	* Return all device parameter settings.
164	*/
165	std::map<String,DeviceCreationParameter*> DeviceParameters();
166
167	/**
168	* Registers the specified listener to be notified
169	* when the number of MIDI input ports is changed.
170	*/
171	void AddMidiPortCountListener(MidiPortCountListener* l);
172
173	/**
174	* Removes the specified listener, to stop being notified of
175	* further MIDI input port count chances.
176	*/
177	void RemoveMidiPortCountListener(MidiPortCountListener* l);
178
179	protected:
180	std::map<String,DeviceCreationParameter*> Parameters; ///< All device parameters.
181	std::map<int,MidiInputPort*> Ports; ///< All MIDI ports.
182	void* pSampler; ///< Sampler instance. FIXME: should actually be of type Sampler*
183	ListenerList<MidiPortCountListener*> portCountListeners;
184
185	/**
186	* Constructor
187	*
188	* FIXME: the pointer argument \a pSapmler should actually be of type Sampler*.
189	* Unfortunately the bidirectional relationship between this
190	* header and Sampler.h would clash on header file inclusion,
191	* so that's why I had to make it of type void* here. This is
192	* an annoying constraint of C++.
193	*/
194	MidiInputDevice(std::map<String,DeviceCreationParameter> DriverParameters, void pSampler);
195
196	/**
197	* Destructor
198	*/
199	virtual ~MidiInputDevice();
200
201	/**
202	* Notifies listeners that the amount of MIDI inpurt ports have
203	* been changed.
204	* @param NewCount The new number of MIDI input ports.
205	*/
206	void fireMidiPortCountChanged(int NewCount);
207
208	/**
209	* Notifies listeners that the supplied MIDI input port is
210	* going to be removed soon.
211	* @param pPort The MIDI input port that is going to be removed.
212	*/
213	void fireMidiPortToBeRemoved(MidiInputPort* pPort);
214
215	/**
216	* Notifies listeners that the supplied MIDI input port has
217	* just been added.
218	* @param pPort The MIDI input port that has been added.
219	*/
220	void fireMidiPortAdded(MidiInputPort* pPort);
221
222	/**
223	* Set number of MIDI ports required by the engine
224	* This can either do nothing, create more ports
225	* or destroy ports depenging on the parameter
226	* and how many ports already exist on this driver.
227	*
228	* @param Ports - number of ports to be left on this driver after this call.
229	*/
230	void AcquirePorts(uint Ports);
231
232	friend class ParameterActive;
233	friend class ParameterPorts;
234	friend class MidiInputDeviceFactory; // allow MidiInputDeviceFactory class to destroy midi devices
235	friend class MidiInputPort; // allow MidiInputPort to access pSampler
236	};
237	}
238
239	#endif // __LS_MIDIINPUTDEVICE_H__