src/mididriver/MidiInputDevice.h

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and 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/LinuxSamplerException.h"
#include "../drivers/DeviceParameter.h"
#include "../engines/common/Engine.h"

namespace LinuxSampler {

    // just symbol prototyping
    class Engine;

    /** 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:

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

            class ParameterActive : public DeviceCreationParameterBool {
                    public:
                            ParameterActive(MidiInputDevice *pDevice)                                   {this->pDevice = pDevice; InitWithDefault(); }
                            ParameterActive(MidiInputDevice* pDevice, String active) throw (LinuxSamplerException) : DeviceCreationParameterBool(active) { this->pDevice = pDevice; }
                            virtual String Description()                                                { return "Enable / disable device";  }
                            virtual bool   Fix()                                                        { return false;                      }
                            virtual bool   Mandatory()                                                  { return false;                      }
                            virtual std::map<String,DeviceCreationParameter*> DependsAsParameters()     { return std::map<String,DeviceCreationParameter*>(); }
                            virtual optional<bool> DefaultAsBool(std::map<String,String> Parameters)    { return true;                       }
                            virtual void OnSetValue(bool b) throw (LinuxSamplerException)               { if (b) pDevice->Listen(); else pDevice->StopListen(); }
                    protected:
                            MidiInputDevice* pDevice;
            };

            class ParameterPorts : public DeviceCreationParameterInt {
                    public:
                            ParameterPorts(MidiInputDevice* pDevice) { this->pDevice = pDevice; InitWithDefault();}
                            ParameterPorts(MidiInputDevice* pDevice, String val) throw (LinuxSamplerException) : DeviceCreationParameterInt(val) { this->pDevice = pDevice; }
                            virtual String Description()                                                    { return "Number of ports";   }
                            virtual bool   Fix()                                                            { return false;   }
                            virtual bool   Mandatory()                                                      { return false;   }
                            virtual std::map<String,DeviceCreationParameter*> DependsAsParameters()         { return std::map<String,DeviceCreationParameter*>(); }
                            virtual optional<int>    DefaultAsInt(std::map<String,String> Parameters)       { return 0; }
                            virtual optional<int>    RangeMinAsInt(std::map<String,String> Parameters)      { return optional<int>::nothing;   }
                            virtual optional<int>    RangeMaxAsInt(std::map<String,String> Parameters)      { return optional<int>::nothing;   }
                            virtual std::vector<int> PossibilitiesAsInt(std::map<String,String> Parameters) { return std::vector<int>();   }
                            virtual void             OnSetValue(int i) throw (LinuxSamplerException)        { pDevice->AcquirePorts(i); }
                    protected:
                            MidiInputDevice* pDevice;
            };

            class MidiInputPort {

                    public:
                            /**
                             * MIDI channels
                             */
                            enum midi_chan_t {
                                    midi_chan_all = 0,
                                    midi_chan_1   = 1,
                                    midi_chan_2   = 2,
                                    midi_chan_3   = 3,
                                    midi_chan_4   = 4,
                                    midi_chan_5   = 5,
                                    midi_chan_6   = 6,
                                    midi_chan_7   = 7,
                                    midi_chan_8   = 8,
                                    midi_chan_9   = 9,
                                    midi_chan_10  = 10,
                                    midi_chan_11  = 11,
                                    midi_chan_12  = 12,
                                    midi_chan_13  = 13,
                                    midi_chan_14  = 14,
                                    midi_chan_15  = 15,
                                    midi_chan_16  = 16
                            };

                            class ParameterName : public DeviceCreationParameterString {
                                    public:
                                            ParameterName(MidiInputPort* pPort) { this->pPort = pPort; InitWithDefault();}
                                            ParameterName(MidiInputPort* pPort, String val) : DeviceCreationParameterString(val) { this->pPort = pPort; }
                                            virtual String Description()        { return "Name for this port"; }
                                            virtual bool   Fix()                { return false; }
                                            virtual bool   Mandatory()          { return false; }
                                            virtual std::map<String,DeviceCreationParameter*> DependsAsParameters() { return std::map<String,DeviceCreationParameter*>(); }
                                            virtual optional<String>    Default(std::map<String,String> Parameters) { return ""; }
                                            virtual std::vector<String> PossibilitiesAsString(std::map<String,String> Parameters) { return std::vector<String>(); }
                                            virtual void OnSetValue(String s) throw (LinuxSamplerException) { return; /* FIXME: Nothing to do here */ }
                                    protected:
                                            MidiInputPort * pPort;
                            };

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

                            /**
                             * Connect given sampler engine with this MIDI input device.
                             * The engine can either be connected to one specific MIDI
                             * channel or all MIDI channels. If an engine gets connected
                             * twice to this MIDI input device, then the engine's old
                             * connection will be detached (no matter on which MIDI channel).
                             *
                             * @param pEngine     - sampler engine
                             * @param MidiChannel - MIDI channel to connect to
                             * @throws MidiInputException  if MidiChannel argument invalid
                             */
                            void Connect(Engine* pEngine, midi_chan_t MidiChannel);

                            /**
                             * Disconnect given sampler engine from this MIDI input device.
                             *
                             * @param pEngine - sampler engine
                             */
                            void Disconnect(Engine* pEngine);

                            static std::map<String,DeviceCreationParameter*> AvailableParameters();
                            std::map<String,DeviceCreationParameter*> DeviceParameters();
                            MidiInputDevice* GetDevice();
                            uint GetPortNumber();

                            /////////////////////////////////////////////////////////////////
                            // dispatch methods
                            //     (should be called by the MidiInputDevice descendant on events)

                            /**
                             * Should be called by the implementing MIDI input device
                             * whenever a note on event arrived, this will cause the note on
                             * event to be forwarded to all connected engines on the
                             * corresponding MIDI channel.
                             *
                             * @param Key         - MIDI key number of the triggered key
                             * @param Velocity    - MIDI velocity of the triggered key
                             * @param MidiChannel - MIDI channel on which event occured on
                             */
                            void DispatchNoteOn(uint8_t Key, uint8_t Velocity, uint MidiChannel);

                            /**
                             * Should be called by the implementing MIDI input device
                             * whenever a note off event arrived, this will cause the note
                             * off event to be forwarded to all connected engines on the
                             * corresponding MIDI channel.
                             *
                             * @param Key         - MIDI key number of the released key
                             * @param Velocity    - MIDI velocity of the released key
                             * @param MidiChannel - MIDI channel on which event occured on
                             */
                            void DispatchNoteOff(uint8_t Key, uint8_t Velocity, uint MidiChannel);

                            /**
                             * Should be called by the implementing MIDI input device
                             * whenever a pitchbend event arrived, this will cause the
                             * pitchbend event to be forwarded to all connected engines.
                             *
                             * @param Pitch       - MIDI pitch value
                             * @param MidiChannel - MIDI channel on which event occured on
                             */
                            void DispatchPitchbend(int Pitch, uint MidiChannel);

                            /**
                             * Should be called by the implementing MIDI input device
                             * whenever a control change event arrived, this will cause the
                             * control change event to be forwarded to all engines on the
                             * corresponding MIDI channel.
                             *
                             * @param Controller  - MIDI controller number
                             * @param Value       - MIDI control change value
                             * @param MidiChannel - MIDI channel on which event occured on
                             */
                            void DispatchControlChange(uint8_t Controller, uint8_t Value, uint MidiChannel);

                    protected:
                            MidiInputPort(MidiInputDevice* pDevice, int portNumber) { this->pDevice = pDevice; this->portNumber = portNumber;}
                            MidiInputDevice* pDevice;
                            int portNumber;
                            std::map<String,DeviceCreationParameter*> Parameters;  ///< All port parameters.
                            std::set<Engine*> MidiChannelMap[17]; ///< Contains the list of connected engines for each MIDI channel, where index 0 points to the list of engines which are connected to all MIDI channels. Usually it's not necessary for the descendant to use this map, instead it should just use the Dispatch* methods.
                            virtual ~MidiInputPort();

                            friend class MidiInputDevice;

                    private:
                            static std::map<String,DeviceCreationParameter*> CreateAvailableParameters();
            };

            /**
             * Return midi port
             */
            MidiInputPort* GetPort(int i) { return Ports[i]; }

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

            template <class Parameter_T>
            class OptionalParameter {
                public:                     
                        static Parameter_T* New(MidiInputDevice* pDevice, String val) { if (val == "") return (new Parameter_T(pDevice)); return (new Parameter_T(pDevice, val)); } 
            };

            static std::map<String,DeviceCreationParameter*> AvailableParameters();
            std::map<String,DeviceCreationParameter*> DeviceParameters();

            /////////////////////////////////////////////////////////////////
            // 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;

        protected:
            std::map<String,DeviceCreationParameter*> Parameters;  ///< All device parameters.
            std::map<int,MidiInputPort*> Ports;

            MidiInputDevice(std::map<String,DeviceCreationParameter*> DriverParameters);

            virtual ~MidiInputDevice();


            friend class Sampler; // allow Sampler class to destroy midi devices

        private:
            static std::map<String,DeviceCreationParameter*> CreateAvailableParameters();

            /**
             * 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);
    };

    /**
     * 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 LinuxSamplerException {
        public:
            MidiInputException(const std::string& msg) : LinuxSamplerException(msg) {}
    };
}

#endif // __LS_MIDIINPUTDEVICE_H__
1	schoenebeck	53	/***************************************************************************
2			* *
3			* LinuxSampler - modular, streaming capable sampler *
4			* *
5	schoenebeck	56	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	schoenebeck	53	* *
7			* This program is free software; you can redistribute it and/or modify *
8			* it under the terms of the GNU General Public License as published by *
9			* the Free Software Foundation; either version 2 of the License, or *
10			* (at your option) any later version. *
11			* *
12			* This program is distributed in the hope that it will be useful, *
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of *
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
15			* GNU General Public License for more details. *
16			* *
17			* You should have received a copy of the GNU General Public License *
18			* along with this program; if not, write to the Free Software *
19			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
20			* MA 02111-1307 USA *
21			***************************************************************************/
22
23			#ifndef __LS_MIDIINPUTDEVICE_H__
24			#define __LS_MIDIINPUTDEVICE_H__
25
26			#include <stdexcept>
27			#include <set>
28	senkov	153	#include <map>
29			#include <vector>
30	schoenebeck	53
31			#include "../common/global.h"
32			#include "../common/LinuxSamplerException.h"
33	senkov	153	#include "../drivers/DeviceParameter.h"
34	schoenebeck	53	#include "../engines/common/Engine.h"
35
36			namespace LinuxSampler {
37
38			// just symbol prototyping
39			class Engine;
40
41			/** Abstract base class for MIDI input drivers in LinuxSampler
42			*
43			* This class will be derived by specialized classes which implement the
44			* connection to a specific MIDI input system (e.g. Alsa Sequencer,
45			* CoreMIDI). The MidiInputDevice desendant should just call the
46			* appropriate (protected) Dispatch* method here when an MIDI event
47			* occured. The dispatch* methods here will automatically forward the
48			* MIDI event to the appropriate, connected sampler engines.
49			*/
50			class MidiInputDevice {
51			public:
52
53			/////////////////////////////////////////////////////////////////
54			// type definitions
55
56	senkov	153	class ParameterActive : public DeviceCreationParameterBool {
57			public:
58			ParameterActive(MidiInputDevice *pDevice) {this->pDevice = pDevice; InitWithDefault(); }
59			ParameterActive(MidiInputDevice* pDevice, String active) throw (LinuxSamplerException) : DeviceCreationParameterBool(active) { this->pDevice = pDevice; }
60			virtual String Description() { return "Enable / disable device"; }
61			virtual bool Fix() { return false; }
62			virtual bool Mandatory() { return false; }
63			virtual std::map<String,DeviceCreationParameter> DependsAsParameters() { return std::map<String,DeviceCreationParameter>(); }
64			virtual optional<bool> DefaultAsBool(std::map<String,String> Parameters) { return true; }
65			virtual void OnSetValue(bool b) throw (LinuxSamplerException) { if (b) pDevice->Listen(); else pDevice->StopListen(); }
66			protected:
67			MidiInputDevice* pDevice;
68			};
69	schoenebeck	64
70	senkov	153	class ParameterPorts : public DeviceCreationParameterInt {
71			public:
72			ParameterPorts(MidiInputDevice* pDevice) { this->pDevice = pDevice; InitWithDefault();}
73			ParameterPorts(MidiInputDevice* pDevice, String val) throw (LinuxSamplerException) : DeviceCreationParameterInt(val) { this->pDevice = pDevice; }
74			virtual String Description() { return "Number of ports"; }
75			virtual bool Fix() { return false; }
76			virtual bool Mandatory() { return false; }
77			virtual std::map<String,DeviceCreationParameter> DependsAsParameters() { return std::map<String,DeviceCreationParameter>(); }
78			virtual optional<int> DefaultAsInt(std::map<String,String> Parameters) { return 0; }
79			virtual optional<int> RangeMinAsInt(std::map<String,String> Parameters) { return optional<int>::nothing; }
80			virtual optional<int> RangeMaxAsInt(std::map<String,String> Parameters) { return optional<int>::nothing; }
81			virtual std::vector<int> PossibilitiesAsInt(std::map<String,String> Parameters) { return std::vector<int>(); }
82			virtual void OnSetValue(int i) throw (LinuxSamplerException) { pDevice->AcquirePorts(i); }
83			protected:
84			MidiInputDevice* pDevice;
85			};
86	schoenebeck	53
87	senkov	153	class MidiInputPort {
88	schoenebeck	53
89	senkov	153	public:
90			/**
91			* MIDI channels
92			*/
93			enum midi_chan_t {
94			midi_chan_all = 0,
95			midi_chan_1 = 1,
96			midi_chan_2 = 2,
97			midi_chan_3 = 3,
98			midi_chan_4 = 4,
99			midi_chan_5 = 5,
100			midi_chan_6 = 6,
101			midi_chan_7 = 7,
102			midi_chan_8 = 8,
103			midi_chan_9 = 9,
104			midi_chan_10 = 10,
105			midi_chan_11 = 11,
106			midi_chan_12 = 12,
107			midi_chan_13 = 13,
108			midi_chan_14 = 14,
109			midi_chan_15 = 15,
110			midi_chan_16 = 16
111			};
112	schoenebeck	53
113	senkov	153	class ParameterName : public DeviceCreationParameterString {
114			public:
115			ParameterName(MidiInputPort* pPort) { this->pPort = pPort; InitWithDefault();}
116			ParameterName(MidiInputPort* pPort, String val) : DeviceCreationParameterString(val) { this->pPort = pPort; }
117			virtual String Description() { return "Name for this port"; }
118			virtual bool Fix() { return false; }
119			virtual bool Mandatory() { return false; }
120			virtual std::map<String,DeviceCreationParameter> DependsAsParameters() { return std::map<String,DeviceCreationParameter>(); }
121			virtual optional<String> Default(std::map<String,String> Parameters) { return ""; }
122			virtual std::vector<String> PossibilitiesAsString(std::map<String,String> Parameters) { return std::vector<String>(); }
123			virtual void OnSetValue(String s) throw (LinuxSamplerException) { return; /* FIXME: Nothing to do here */ }
124			protected:
125			MidiInputPort * pPort;
126			};
127	schoenebeck	53
128	senkov	153	/////////////////////////////////////////////////////////////////
129			// normal methods
130			// (usually not to be overriden by descendant)
131	schoenebeck	53
132	senkov	153	/**
133			* Connect given sampler engine with this MIDI input device.
134			* The engine can either be connected to one specific MIDI
135			* channel or all MIDI channels. If an engine gets connected
136			* twice to this MIDI input device, then the engine's old
137			* connection will be detached (no matter on which MIDI channel).
138			*
139			* @param pEngine - sampler engine
140			* @param MidiChannel - MIDI channel to connect to
141			* @throws MidiInputException if MidiChannel argument invalid
142			*/
143			void Connect(Engine* pEngine, midi_chan_t MidiChannel);
144	schoenebeck	53
145	senkov	153	/**
146			* Disconnect given sampler engine from this MIDI input device.
147			*
148			* @param pEngine - sampler engine
149			*/
150			void Disconnect(Engine* pEngine);
151	schoenebeck	53
152	senkov	153	static std::map<String,DeviceCreationParameter*> AvailableParameters();
153			std::map<String,DeviceCreationParameter*> DeviceParameters();
154			MidiInputDevice* GetDevice();
155			uint GetPortNumber();
156	schoenebeck	53
157	senkov	153	/////////////////////////////////////////////////////////////////
158			// dispatch methods
159			// (should be called by the MidiInputDevice descendant on events)
160	schoenebeck	53
161	senkov	153	/**
162			* Should be called by the implementing MIDI input device
163			* whenever a note on event arrived, this will cause the note on
164			* event to be forwarded to all connected engines on the
165			* corresponding MIDI channel.
166			*
167			* @param Key - MIDI key number of the triggered key
168			* @param Velocity - MIDI velocity of the triggered key
169			* @param MidiChannel - MIDI channel on which event occured on
170			*/
171			void DispatchNoteOn(uint8_t Key, uint8_t Velocity, uint MidiChannel);
172	schoenebeck	53
173	senkov	153	/**
174			* Should be called by the implementing MIDI input device
175			* whenever a note off event arrived, this will cause the note
176			* off event to be forwarded to all connected engines on the
177			* corresponding MIDI channel.
178			*
179			* @param Key - MIDI key number of the released key
180			* @param Velocity - MIDI velocity of the released key
181			* @param MidiChannel - MIDI channel on which event occured on
182			*/
183			void DispatchNoteOff(uint8_t Key, uint8_t Velocity, uint MidiChannel);
184	schoenebeck	64
185	senkov	153	/**
186			* Should be called by the implementing MIDI input device
187			* whenever a pitchbend event arrived, this will cause the
188			* pitchbend event to be forwarded to all connected engines.
189			*
190			* @param Pitch - MIDI pitch value
191			* @param MidiChannel - MIDI channel on which event occured on
192			*/
193			void DispatchPitchbend(int Pitch, uint MidiChannel);
194	schoenebeck	53
195	senkov	153	/**
196			* Should be called by the implementing MIDI input device
197			* whenever a control change event arrived, this will cause the
198			* control change event to be forwarded to all engines on the
199			* corresponding MIDI channel.
200			*
201			* @param Controller - MIDI controller number
202			* @param Value - MIDI control change value
203			* @param MidiChannel - MIDI channel on which event occured on
204			*/
205			void DispatchControlChange(uint8_t Controller, uint8_t Value, uint MidiChannel);
206	schoenebeck	53
207	senkov	153	protected:
208			MidiInputPort(MidiInputDevice* pDevice, int portNumber) { this->pDevice = pDevice; this->portNumber = portNumber;}
209			MidiInputDevice* pDevice;
210			int portNumber;
211			std::map<String,DeviceCreationParameter*> Parameters; ///< All port parameters.
212			std::set<Engine> MidiChannelMap[17]; ///< Contains the list of connected engines for each MIDI channel, where index 0 points to the list of engines which are connected to all MIDI channels. Usually it's not necessary for the descendant to use this map, instead it should just use the Dispatch methods.
213			virtual ~MidiInputPort();
214	schoenebeck	64
215	senkov	153	friend class MidiInputDevice;
216	schoenebeck	64
217	senkov	153	private:
218			static std::map<String,DeviceCreationParameter*> CreateAvailableParameters();
219			};
220	schoenebeck	64
221	senkov	153	/**
222			* Return midi port
223			*/
224			MidiInputPort* GetPort(int i) { return Ports[i]; }
225	schoenebeck	53
226	senkov	153	/**
227			* Create new Midi port
228			* This will be called by AcquirePorts
229			* Each individual device must implement this.
230			*/
231			virtual MidiInputPort* CreateMidiPort( void ) = 0;
232	schoenebeck	53
233	senkov	153	template <class Parameter_T>
234			class OptionalParameter {
235			public:
236			static Parameter_T* New(MidiInputDevice* pDevice, String val) { if (val == "") return (new Parameter_T(pDevice)); return (new Parameter_T(pDevice, val)); }
237			};
238	schoenebeck	53
239	senkov	153	static std::map<String,DeviceCreationParameter*> AvailableParameters();
240			std::map<String,DeviceCreationParameter*> DeviceParameters();
241	schoenebeck	53
242	senkov	153	/////////////////////////////////////////////////////////////////
243			// abstract methods
244			// (these have to be implemented by the descendant)
245
246			/**
247			* Start listen to MIDI input events on the MIDI input port.
248			* The MIDIInputPort descendant should forward all MIDI input
249			* events by calling the appropriate (protected) Dispatch*
250			* method of class MidiInputPort.
251			*/
252			virtual void Listen() = 0;
253
254			/**
255			* Stop to listen to MIDI input events on the MIDI input port.
256			* After this method was called, the MidiInputPort descendant
257			* should ignore all MIDI input events.
258			*/
259			virtual void StopListen() = 0;
260
261			/**
262			* Return device driver name
263			*/
264			virtual String Driver() = 0;
265
266			protected:
267			std::map<String,DeviceCreationParameter*> Parameters; ///< All device parameters.
268			std::map<int,MidiInputPort*> Ports;
269
270			MidiInputDevice(std::map<String,DeviceCreationParameter*> DriverParameters);
271
272			virtual ~MidiInputDevice();
273
274
275			friend class Sampler; // allow Sampler class to destroy midi devices
276
277			private:
278			static std::map<String,DeviceCreationParameter*> CreateAvailableParameters();
279
280	schoenebeck	53	/**
281	senkov	153	* Set number of MIDI ports required by the engine
282			* This can either do nothing, create more ports
283			* or destroy ports depenging on the parameter
284			* and how many ports already exist on this driver.
285	schoenebeck	53	*
286	senkov	153	* @param Ports - number of ports to be left on this driver after this call.
287	schoenebeck	53	*/
288	senkov	153	void AcquirePorts(uint Ports);
289	schoenebeck	53	};
290
291			/**
292			* Midi input exception that should be thrown by the MidiInputDevice
293			* descendants in case initialization of the MIDI input system failed
294			* (which should be done in the constructor of the MidiInputDevice
295			* descendant).
296			*/
297			class MidiInputException : public LinuxSamplerException {
298			public:
299			MidiInputException(const std::string& msg) : LinuxSamplerException(msg) {}
300			};
301			}
302
303			#endif // __LS_MIDIINPUTDEVICE_H__